Immobilization of Amylase on Magnetic Nanoparticles Essay

Abstract ÃŽ ±-amylase was immobilized covalently on iron oxide magnetic nanoparticles. The synthesis of magnetic nanoparticles was done by the coprecipitation conventional method. The chemical composition and particle size of the synthesized particles was confirmed via X-ray diffraction. Tyrosine, Lucien and chitosan and glutaraldehyde were investigated to make a covalent binding between the iron oxide magnetic core and the immobilized enzyme. Immobilization using chitosan and glutaraldehyde show the best result. Finally the immobilization efficiency was tested by determination of protein concentration in a solution before and after mixing with the magnetic nanoparticles. Introduction In the last two decades, new terms with the prefix `nano’ have rushed into the scientific vocabulary; nanoparticle, nanostructure, nanotechnology, nanomaterial, nanocluster, nanochemistry, nanocolloids, nanoreactor and so on. Nanoparticles, are defined as particulate dispersions with a size in the range of 10-100nm (Gubin et al, 2005). Magnetic nanoparticles have gained a remarkable interest in the last years both for basic research and applied studies. The use of magnetic nanostructures has been proven in biochemistry, biomedicine, and waste treatment among other fields. This broad range of applications is based on the fact that magnetic particles have very large magnetic moments, which allow them to be transported and driven by external magnetic fields. The magnetic nanostructures have also a great potential in biotechnological processes taking into account that they can be utilized as a carrier for enzymes during different biocatalytic transformations (Dussà ¡n et al, 2007 ). Different types of biomolecules such as proteins, enzymes, antibodies, and anticancer agents can be immobilized on these nanoparticles. Magnetic supports for immobilization purpose are either prepared by incorporating magnetic particles during the synthesis of the supporting polymer or magnetic particles itself be coated with common support materials such as dextran or agarose. Recently, a new method for the direct binding of proteins on magnetic nanoparticles via carbodiimide activation was proposed (Ren et al, 2011). Immobilization is one of the efficient methods to improve enzyme stability. There are various methods for immobilization of enzymes on many different types of supports. It can be a chemical method in which ionic or covalent bond formations occur between the enzyme and the carrier, or it can be a physical method, such as adsorption or entrapment of the enzyme in or on a solid support material. Magnetic nanoparticles as immobilization materials have advantage based on its property and size that make it desirable for using it in various applications (Mateo et al, 2007). Iron oxide nanoparticles, Fe3O4, are one of the widely used types of magnetic nanoparticles and have great potential for applications in biology and medicine due to their strong magnetic properties and low toxicity (Jalal et al, 2011) Review of literature I) Magnetic nanoparticles: The historical development of nanoparticles starting with Paul Ehrlich and then first attempts by Ursula Scheffel and colleagues and the extensive work by the group of Professor Peter Speiser at the ETH Zà ¼rich in the late 1960s and early 1970s (Jà ¶rg Kreuter 2007). They are solid particles with a size from 10 to 100nm which can be manipulated using magnetic field. Such particles commonly consist of magnetic elements such as iron, nickel and cobalt. They have been used in catalysis, biomedicine, magnetic resonance imaging, magnetic particle imaging, data storage , environmental remediation and optical filters (Gubin et al, 2005). Magnetic nanoparticles as immobilization materials have the following advantages: simple and inexpensive production, can be released in controlled manner, stable magnetic properties of complexed nanoparticles and easy isolation steps in short time. Among these materials, Fe3O4 magnetic nanoparticles are the most commonly studied. Fe3O4 magnetic nanoparticles have good biocompatibility, strong superparamagnetism, low toxicity, and an easy preparation process, and their use in biosensors has already shown attractive prospects (Sheng-Fu Wang and Yu-Mei Tan, 2007). II) Magnetic core material: There are many magnetic materials available with a wide range of magnetic properties. such as cobalt, chromium and iron oxide-based materials such as magnetite and maghemite. The suitable magnetic materials depend on applications the MNP will apply in (Dobson et al, 2007). Magnetite Fe3O4: Magnetite is a common mineral which exhibits ferro (ferri) magnetic properties. The structure of magnetite belongs to the spinel group, which has a formula of AB2O4. Its ferromagnetic structures arise from alternating lattices of Fe(II) and Fe(III). This gives it a very strong magnetization compared to naturally occurring antiferromagnetic compounds such as the ferrihydrite core of the ferritin protein (McBain et al, 2008). III) Synthesis of iron Magnetic nanoparticles: There were many synthesis methods for magnetic nanoparticles one of these is Co-precipitation. This method may be the most promising one because of its simplicity and productivity (zhao et al., 2008). It is widely used for biomedical applications because of ease of implementation and need for less hazardous materials and procedures. Co-precipitation is specifically the precipitation of an unbound â€Å"antigen along with an antigen-antibody complex† in terms of medicine (Indira and Lakshmi, 2010).The reaction principle is simply as: Fe2+ + 2Fe3+ + 8OH– ⇔ Fe (OH)2 + 2Fe(OH)3 → Fe3O4 + 4H2O (Guo et al., 2009). Other method used for synthesis like: Thermolysis of metal-containing compounds, synthesis of magnetic nanoparticles at a gas-liquid interface, synthesis in reverse micelles and sol-gel method (Gubin et al, 2005). IV) Characterization of MNP: There is no unique method for determination of the nanoparticle composition and dimensions; as a rule, a set of methods including X-ray diffraction, Transmission electron microscope and Extended X-ray Absorption Fine Structure (EXAFS) Spectroscopy are used (Gubin et al, 2005). X-Ray diffraction analysis of nanomaterial seldom produces diffraction patterns with a set of narrow reflections adequate for identification of the composition of the particles they contain. Some X-ray diffraction patterns exhibit only two or three broadened peaks of the whole set of reflections typical of the given phase (Moroz 2011). In the case of larger particles (provided that high-quality X-ray diffraction patterns can be obtained), it is often possible not only to determine the phase composition but also to estimate, based on the reflection width, the size of coherent X-ray scattering areas, corresponding to the average crystallite (nanoparticle) size. This is usually done by the Scherer formula (Gubin et al, 2005). The nanoparticle dimensions are determined most often using Transmission electron microscope, which directly shows the presence of nanoparticles in the material under examination and their arrangement relative to one another. The phase composition of nanoparticles can be derived from electron diffraction patterns recorded for the same sample during the investigation. Note that in some cases, TEM investigations of dynamic processes are also possible. For example, the development of dislocations and disclinations in the nanocrystalline during the mechanochemical treatment has been observed (Woehrle et al, 2000). More comprehensive information is provided by high resolution transmission electron microscopy, which allows one to study the structure of both the core and the shell of a nanoparticle with atomic resolution, and in some cases, even to determine their stoichiometric composition (Woehrle et al, 2000). The structures of non-crystalline samples are often studied by EXAFS spectroscopy. An important advantage of these methods is its selectivity, because it provides the radial distribution (RDA) curve for the atoms of the local environment of the chosen chemical element in the sample. The interatomic distances (R) and coordination numbers (N) obtained by EXAFS are then compared with the known values for the particular phase (Gubin et al, 2005). Other methods are used more rarely to study the nanoparticle structures. Integrated research makes it possible to determine rather reliably the structures of simple nanoparticles; however, determination of the structures of nanoparticles composed of a core and a shell of different compositions are often faced with difficulties (Gubin et al, 2005). V) Stabilization of Magnetic Nanoparticles: Although there have been many significant developments in the synthesis of magnetic nanoparticles, maintaining the stability of these particles for a long time without agglomeration or precipitation is an important issue. Stability is a crucial requirement for almost any application of magnetic nanoparticles. Especially pure metals, such as Fe, Co, and Ni and their metal alloys, are very sensitive to air. Thus, the main difficulty for the use of pure metals or alloys arises from their instability towards oxidation in air, and the susceptibility towards oxidation becomes higher the smaller the particles are (Lu et al, 2007). Therefore, it is necessary to develop efficient strategies to improve the chemical stability of magnetic nanoparticles: Surface Passivation by Mild Oxidation: A very simple approach to protect the magnetic particles is to induce a controlled oxidation of a pure metal core, a technique long known for the passivation of air-sensitive supported catalysts. This oxidation can be achieved by various methods (Peng et al, 1999). For example, Peng et al. developed a method for oxidizing gas-phase nanoparticles by using a plasma-gas-condensation-type cluster deposition apparatus. Demonstrated that very good control over the chemical state of the cobalt nanoparticles was achieved by their exposure to an oxygen plasma. The control of the oxide layer has a tremendous impact on exchange-biased systems, where a well-defined thickness of the ferromagnetic core and the anti-ferromagnetic shell are desirable. Moreover, a direct correlation of the structure and magnetism in the small particles can be determined. developed a mild oxidation method, using synthetic air to smoothly oxidize the as-synthesized cobalt nanoparticles to form a stable outer layer which can stabilize the nanoparticles against further oxidation (Peng et al, 1999). Other methods: Matrix-Dispersed Magnetic Nanoparticles, Carbon Coating, Silica Coating , Precious-Metal Coating and Surfactant and Polymer Coating Typical strategies for immobilizing catalysis enzyme onto MNPs rely on surface grafting via low molecular weight linkers or polymers containing amino or epoxy functional groups to which enzyme are reacted via covalent conjugation methods (Ren et al, 2011). Due to their high specific surface area and easy separation from the reaction medium by the use of a magnetic field, they have been employed in enzymatic catalysis applications ex amylase EC 3.2.1 (Ren et al, 2011). The maximum reported loading capacity of amylase is approximately 81.97 mg/g (AktaÅŸ et al, 2011). One drawback of existing immobilization technologies is that the activity of enzyme decreases significantly upon immobilization due possibly to changes in enzyme secondary structure, or limited access of substrate to the active site of the surface bound enzyme (Lei et al, 2009). Thus, despite numerous reported approaches for immobilization of catalysis enzyme on magnetic nanoparticles, there is still the need for simple, cost-effective and high loading capacity methods. Aim of work Is to Synthesis of iron magnetic nanoparticle (MNP) then immobilize amylase on MNP and test the efficiency of immobilization method then study the activity of immobilized amylase.

Beliefs And Practices In China

The three main religions in China – Confucianism, Daoism, and Buddhism – originated at about the same time and share common beliefs in human goodness and the need to behave kindly and justly. However, they differ in their practices and, more importantly, in how they view deities and the afterlife. Derived from Confucius’ teachings around 500 BC, Confucianism emphasizes justice, sincerity, morality, and hierarchy.It emphasizes conduct and decorum over spirituality, emphasizing self-control and obedience instead of religious doctrine in the Judeo-Christian sense. Its practices include being sincere, just, and deferential to elders, since it embraces a strict view of worldly hierarchy and the need for etiquette rather than one governed by gods or an omnipotent single God. In this sense, it is less a religion than â€Å"a tradition of ritual/propriety† (Yao 191) which upholds sacrifices to heavenly, earthly, and ancestral spirits (generally performed in temple s).It is hard to define as a religion because it does not fit the Western world’s criteria and is more a tradition and code of behavior; indeed, it was initially used to govern the actions of China’s ancient bureaucrats. (Yao 39) Daoism evolved at about the same time as Confucianism and also embraces virtues like justice, patience, and decency. However, it is more of a religion than Confucianism because it mandates reverence for the Dao (roughly meaning â€Å"the way†), which is â€Å"a cosmic principle, permeating and infusing all aspects of creation with vitality.† (Oldstone-Moore 23) To become one with the Dao, one must attain enlightenment by practicing good, proper behavior in addition to cultivating a spiritual wisdom and serenity through unity with the Tao. Here, Taoism differs sharply from Confucianism, which does not place as much importance on cosmic forces or one’s spiritual nature. It also embraces a more concrete idea of the afterlife than Confucianism, since the Daoist view has the soul entering Hell, being forced to atone, and being reincarnated.(Oldstone-Moore 84-87) Originating in India at roughly the same time as Confucianism and Daoism, Buddhism shares with them the principles of harmony and balance, though to a Westerner it seems more like a religion than either of its fellow faiths. Indeed, its doctrines and rituals are more evolved and clearly-defined than those of China’s other two main religions. Like them, Buddhism teaches that while human nature is essentially good, the world is corrupt and one must practice pure-mindedness and good, just behavior.It also shares with Daoism the importance of seeking cosmic enlightenment, though Buddhists attain it through meditation and discipline. (Wangu 8) However, it also mandates a degree of asceticism (like varying degrees of vegetarianism) not required by Confucianism or Daoism, asking its laypeople to refrain from violence, theft, sexual misconduct, usi ng intoxicants, and â€Å"incorrect speech† (lying, gossiping, etc. ).Also, Buddhism’s concepts of the soul and afterlife are much more developed than those of either Confucianism or Daoism, and it places more emphasis on its written scriptures (which were committed to print during the first century AD). However, it has no supreme being and does not demand exclusive allegiance, as do Western religions; its appeal â€Å"has rested solely on the message of its founder and its flexibility in adapting to different cultures and philosophies. † (Wangu 10) China’s three chief religions share common traits and basic outlooks (which they openly exchanged over the centuries).Confucianism is the most secular and least spiritual, while Daoism has a more evolved sense of the spirit and afterlife and Buddhism the most evolved concepts of these, as well as the most involved code of practices. In all, they represent varying degrees of spirituality and what Westerners wou ld call â€Å"religion. † BIBLIOGRAPHY Oldstone-Moore, Jennifer. Taoism. New York: Oxford University Press, 2003. Wangu, Madhu Bazaz. Buddhism. New York: Facts on File, 2002. Yao, Xinzhong. Religions of China. Cambridge: Cambridge University Press, 2000.

Character Analysis of Romeo

The character analysis of Romeo Rio Mio and Juliet is a story made up of lovers studying two stars who love each other and think that they are willing to sacrifice their lives. Romeo is a very sullen man and his role has grown considerably in the play in various ways. In this article I will focus on the role of Romeo, his intention and ability, and the relationship with other characters in the play. In the dialogue between Benborio and Montague in the first game of the first act, we learned that Romeo was very strange and avoided his friends. Secret. In this sentence, Benvolio explains to L. This article is a literary analysis of the play of Romeo and Juliet. The format is point, proof, and description. The question is, What are the factors and roles that lead to the extinction of Romeo and Juliet? I used Lady and Road Caplet, Juliet Nurse, and Flore Lawrence. There is also a direct reference to the content in the play. This 929 words Shakespeare plays, Romeo and Juliet show a tragic love story to the readers. This is the story of the two young people who fall in love, the people who bind them and the environment. In particular, four characters, Lady and Lord Capulet, Juliet nurse Friar Laurence played an important role in the destruction of the main characters and young lovers Romeo and Juliet. Those personality leads to their desperate behavior and ultimate death through selfishness, betrayal, and authority over young lovers. The literary analysis of similarities between Romeo and Juliet is similar in that there is a common feature between two or more things. Similarities are used to compare similarities. Romeo and Juliet of Shakespearean plays Romeo and Juliet are comparable in their short relationship. They are strangers, but they are gathering through mutual contact. The most obvious similarities between Romeo and Juliet are each other's eternal love.

Zinc and alcohol metabolism Term Paper Example | Topics and Well Written Essays - 1250 words

Zinc and alcohol metabolism - Term Paper Example The ileum absorbs nearly 3-4 grams of zinc per day and thus the recommended allowances, daily range from 5mg in infants to between 16 and 19 mg per day for lactating women. In addition, it is stored and used in two distinct pools: the fixed pool that is usually bound to metalloproteins, which constitutes 80-90% of body zinc. The second is the labile pool which constitutes loosely binding or free zinc, which is available for exchange by organelles and cells. This kind of pool is susceptible to depletion, especially during dietary zinc deficiency. Free zinc may be toxic to enzymes and proteins and thus the labile pool is largely bound to proteins that carry zinc. Moreover, zinc movement across organelle membranes and plasma is regulated tightly by zinc transporters. Zinc has a vast majority of functions and relates to alcohol intake through its biochemical role in metabolism of alcohol. Zinc is important for cell division and growth. It is crucial, especially during pregnancy for the developing fetus because cells are dividing rapidly. Zinc helps in avoiding pre-term delivery and congenital abnormalities. Zinc is useful in activating growth-weight, height and bone development in children, infants and teenagers. Moreover, zinc plays a role in fertility. In females, it can help in the treatment of menstrual problems and alleviation of pre-menstrual syndrome associated symptoms..In males, it offers protection from infection and enlargement of the prostate gland. It also maintains mobility, sperm count and levels of testosterone at normal (Kang et al, 2008). As a component of most enzymes, it participates in synthesis as well as degradation of lipids, nucleic acids, proteins, carbohydrates and the metabolism of several other micronutrients. Zinc aids in the stabilization of the molecular structure of membranes and cellular components, and in this way contribute to cell and organ maintenance. In addition, zinc is essential in transcription of the

Communication, Conflict and Decision-Making Essay

Communication, Conflict and Decision-Making - Essay Example At this juncture, we will acknowledge that communication meets some barriers, which hinders effective delivery of information to the intended parties. Unsuccessful communication results in conflict of opinions or ideas among the involved parties. In communication, conflict results when there is a dissonance or incompatibility of ideologies and beliefs held by the parties involved. Although conflict may results in both negative and positive consequences, this social dissonance may enhance maturity of social skills among the involved individuals. Conflict management entails employment of mechanisms that facilitate development of positive consequences from a social disagreement. Effective conflict management exercises enhance learning among members of a society on how to handle incompatible opinions in future. Conflict management incorporates the aspect of decision making in solving an underlying problem. A conflict ends after one or both parties involved select the best course of actio n from the available alternative courses of action (James, 2009). From a theoretical perspective, conflicts form an inherent element in social relationship. Within any given social setting, people subscribe to different beliefs and values in life. Therefore, conflicts arise in any society comprising of members with varied philosophical patterns (Erich, 2011). Courtesy of cultural norms, individuals possess natural mechanisms meant to facilitate conflict resolution processes whenever a conflict arises. Effective communication forms the basis of conflict resolution mechanisms. It is through a health conveyance of information between two parties that a conflict reaches a positive end (Stacks & Michael, 2008). I applied some theoretical elements of conflict resolution in past social experiences unknowingly. As a student, I usually fall into conflict situations with friends and

Japan Earthquake and Tsunami 2011 Term Paper Example | Topics and Well Written Essays - 2250 words

Japan Earthquake and Tsunami 2011 - Term Paper Example Natural disasters account as a perfect example signifying the limitations of the human knowledge and control over the world. Scientists and researchers have tried to devise techniques to find out a solution to these occurrences but they have not achieved success in this field. A tragic natural disaster hit the country of Japan on the 11 march 2011. This tragic occurrence was analyzed to be the worst earthquake that had occurred in the history of the country and was highlighted to have set up alarms up till the United States and the South America. The earthquake was accompanied with a tsunami and resulted in a nuclear disaster in the country which was termed to have a higher severity than the Chernobyl nuclear event. These disasters not only hampered the infrastructure of the country but led to the displacement and deaths of thousands of people and resulted in great economic losses for the country (Japan — Earthquake, Tsunami and Nuclear Crisis 2011). The earthquake in Japan ha s been ranked as the fifth most powerful earthquake of the world since the twentieth century. The earthquake was of the magnitude of 9.0 on the Richter scale. The earthquake had the highest severity in the northeastern part of Japan. Twenty four thousand people lost their lives or were missing following the earthquake. The tsunami, that resulted due to the earthquake, led to the destruction and drowning of complete villages in the northeastern part of the country. It was estimated that more than 3,400 buildings in the country had undergone destruction and damage. The power supply across the major cities was disrupted and people had to survive with no electricity and gas. Fires erupted across the areas that were hit mainly in the industrial locations as well as in places where there were oil reservoirs meant for storing the oil. The severity and strength of the earthquake did not settle and 100 minor earthquakes followed within a short period. The communication network across the are as that were hit was also disrupted. Immediately following the earthquake, it was understood by the nuclear experts that the tsunami that had resulted due to the earthquake had posed risk of damage to the Fukushima Daiichi Nuclear Power Station. The chaos that had resulted has not led to provide for a complete analysis of the situation. But owing to the risk, hundred thousands of people were moved from the areas that were close to the nuclear power plants to avoid the adverse effects that could have resulted due to the radiations from the power plants. The combined national organizations and the forces of the country set to work to save the people and move them to safer locations. These included the people from the fire department, police department as well as the armed forces of the country (Dawson et al 2011; Japan — Earthquake, Tsunami and Nuclear Crisis 2011). The earthquake and the tsunami caused enough destruction and negative effects in Japan but the devastation in the country was aggravated by a nuclear breakdown and leakage that occurred in the Fukushima Daiichi Nuclear Power Station. The nuclear power station had been affected by the tsunami as well as the earthquake. The day following the earthquake hit the country, there was a first blast reported from the nuclear power plant. This was accompanied by a second blast after three days. The

Adam Smith and Political Economy Essay Example | Topics and Well Written Essays - 1500 words

Adam Smith and Political Economy - Essay Example The quality of life and individual prosperity is determined by social and economic progress of individuals and the community at large (Bowie, Michaels and Solomon, 243). People should engage in activities that promotes fairness and unity in the society for common interest of the society. Therefore, individuals must show concern for others in the society, in order to achieve harmonious and significant living. The individual’s liberty in fulfilling social obligation is one of the driving forces of a nation development. People make their own choices without interference from others to maximize their personal gain. The choice to be made must satisfy a certain need in the society (Bowie, Michaels and Solomon, 264). Adam Smith perceived rivalry as an important element in an advancement of the nation. Exercising this personal liberty sets persons mind free to engage in activities which brings benefit to both individuals and to the community. This liberty has made people to choose the ir own activities to engage in. However, individual liberty should not obstruct the rights of other people in the society. No one is coerced to undertake any activity whatsoever. This is imperative for advancement of a nation because, people maximize their input in activities of their own choice (Bowie, Michaels and Solomon, 271). People have chance to select and competitively participate in economic activities of their own interest. If people work live without interfering with others affairs, this will promote peace and understanding in the society. Fairness should be the guiding principle in making decision to fulfill communal obligations. The communal regulations are set to guide individuals in choosing their own activities for economic progress (Bowie, Michaels and Solomon, 274). It is always essential to take into consideration the needs of the public before engaging in any activity. People should carry out those activities which will result to individuals benefit and serve the needs of the entire community. Therefore, it is fair to engage in activities of the society as an individual and try to avoid doing things which are likely to cause damage to other people. This means there is an extent to which a person can do things and going beyond the set principles will be unjust to the society. For example in business, traders should sell legal goods otherwise this will be unfair to the consumers. They should also sell those commodities at a fair price and avoid overexploiting the consumers. Fairness should guide them in deciding what to sell and the price at which they will sell those commodities to the public. Fairness will also ensure equality in the nation and people will have a sense of life. On the other hand, injustice limits achievement of individual goals and achievement of their obligations to the society. For example, if some students were allowed to cheat in an exam, this would be unfair to the society and negligence in fulfillment of their obligat ions (Bowie, Michaels and Solomon, 286). Therefore, fairness will determine the individuals’ performance towards their social obligations. Living a moral life is a triumph against evil. The author has emphasized on the importance of living a good life on earth. People should ensure uprightness in all their dealings

Toxin Research Paper Example | Topics and Well Written Essays - 500 words

Toxin - Research Paper Example Ingestion of arsenic in the development stage of the nervous system results in the neurites’ growth being inhibited (CDC, 2011). This is due to the formation of arsenite, which is an arsenic metabolite that forms within 24 hours of ingestion. The arsenite toxic mechanism is to create an increased level of calcium ion levels between neurons that causes the transmembrane potential of the mitochondria to reduce which brings about death of the cell as an eventuality due to caspases (CDC, 2011). Many drugs may result in the manifestation of cardiovascular effects in the form of changes in blood pressure and heart rate (Kacew & Lee, B. 2013). However, the ingestion of some of these substances in significant amounts may result in them having toxic characteristics of the cardiovascular system. Digoxin is one such compound. This is a form of cardiac glycoside that is purified after the extraction from the foxglove plant. The compound is used in the treatment of heart diseases in regulating amounts. However, acute over dosage results in the development of marked bradycardia with the prolongation of the QRS and PR (Thanacoody & Waring, 2008). The toxicity of the compound is similar to arsenic as it affects concentrations of calcium in cells. The compound introduction to the cardiovascular system in vast quantities results conducting and myocardial tissues’ inhibition of ATPase pump of Na+/K+ (Thanacoody & Waring, 2008). This property leads to a reduction in the intracellul ar efflux of calcium through the exchange mechanisms of Na+/Ca2+. The effect is an increase in the calcium intracellular concentrations. That manifests in the form of marked bradycardia (Thanacoody & Waring, 2008). It is also associated with sinus arrests and haemodynamic instability due to varying atrioventricular block degrees. Cadmium is also a toxic substance to the body. However, its toxicity has to do with the endocrine system. The endocrine system is the system of glands

International students could not work in the US Essay - 1

International students could not work in the US - Essay Example In-campus and off-campus job offerings for international students are limited and not that profitable so that a person can meet his/her personal and educational needs easily. Most employees prefer to offer jobs to the citizens of the United States because that appears for them to be beneficial not only for their companies but also for the economy of the country. For companies, recruitment of local people is beneficial because they are able to adjust in their organizational cultures more quickly as compared to foreign students. They understand the norms and values of the US companies because of which the employee training costs of the companies go down. For the economy of the United States, offering jobs to local citizens is beneficial because it reduces the unemployment rate, thus improves the overall economy. The problem statement for this paper is that, ‘in-campus job offerings for international students are not much profitable because of which they have to search for jobs outside the campuses. There exist many challenges for international students both within and outside the campus for international students that need to be

America Today Essay Example | Topics and Well Written Essays - 750 words

America Today - Essay Example Just as before the first round of financial depression, America had just elected a charismatic leader to the White House who promised to fix the problems left by his predecessor. However, he failed to do so and the American people were left to pay the price . I find it quite disturbing that America seems to have a pattern of allowing history to repeat itself. As one will recall from our lessons in this class, America was enjoying one of its longest and largest economic growth spurts before the depression came along. This is a typical scenario that was again played out before the 21st century era of American depression, only this time, both the stock market and banking system collapsed. With more than 15 million Americans out of work, the government chose to pull the country out of the depression era by introducing European style social and economic reforms The New Deal allowed the government to have a more direct hand in the social and economic business of the American people. By adopting a policy of moderate currency inflation the federal government managed to jumpstart the economy and offer relief to some debtors by creating credit facilities that dealt with industry and agriculture. Banks were severely monitored and controlled so that they would not make the mistake of increasing their already existing bad loans. While The New Deal ushered in a new era of social, political, and economic stability for the government, the events happening overseas in Europe and Asia were slowly beginning to rear its ugly head in relation to the existence of America as a pacifist country. The American economy was at its peak when it became directly involved in the European and Asi an wars of World War II. Although the United States of America managed to survive the economic effects of the war through the act of selling bonds, rationing, and other cost saving measures at home, the country was slowly emerging as the de-facto leader in terms of international relations. The defeat of Hitler during the European War by the Allied Forces allowed their scientists to come and work for the Americans who were still dealing with the war in the Asia Pacific at the time. Since the nuclear bombs were actually a Nazi brain child, these scientists who worked on the project simply handed over their research, results, and expertise to their new masters, who in this case, turned out to be the Americans. We helped them fine tune the weapon of mass destruction without really having a real reason to use it in the Asia Pacific war. 3 There is a historical belief that Japan was actually close to surrendering and had already lost the war by the time the U.S. forces had decided to drop the bomb on Hiroshima and Nagasaki. A decision that the government made, according to historical documents, on the fact that by being the first to use a nuclear weapon, the United States will have the upper hand in the nuclear arms race and shall therefore be

Under the Bombs Analysis Essay Example for Free

Under the Bombs Analysis Essay As my first extra credit assignment I had the opportunity to watch â€Å"Under the Bombs†, directed by Philippe Aractingi. The movie became available to the public in 2007, embodying some of the events of the 2006 Lebanon War. The main character of the movie is a wealthy Lebanese Muslim by the name of Zeina Nasrueddi. Although she is from Lebanon, she lives in Dubai with her husband and son Karim. Due to complications within their marriage, Zeina and her husband send their son to stay with her sister in Lebanon. Not too long after, Zeina hears about the outbreak of the war, she rushes to Lebanon to find her son. When she gets there, she finds the area and all of its buildings destroyed. While searching for her son she gains information on his whereabouts. The information sends her on a journey with a Lebanese taxi driver in search of her son. When she finally arrives at her son’s stated location, she finds only her son’s friend who explains to Zeina that Karim is dead. The plot of the movie was very riveting and action-packed. There are many ups and downs throughout the storyline, keeping the viewer intrigued and reeled in. Although the movie wasn’t directed at religion specifically, I was able to view a couple of the Lebanese traditions. Some of the traditions I picked up on were the attire and dances. The taxi driver was Christian so I would have to assume that the dance he conducted in the movie was one of Lebanese tradition and not Muslim. The dance was his attempt of lightening the mood for the very tense and worried Zeina. As far as the attire goes, the women wore long dresses, only revealing their face. This form of attire is very closely related to the Muslim tradition. Although the ending was rather sad, the movie was great in content.

Risk Management In Naval Operations

Risk Management In Naval Operations The concept of risk management has been around the Navy since its inception. During the drawdown of the 1990s, the risk management concept was formalized into the Operational Risk Management (ORM) program. This approach was initiated to mitigate the risks associated with such a massive reorganization. This paper examines the Naval Directive Office of the Chief of Naval Operations Instruction 3500.39C OPNAVINST 3500.39C (02 July, 2010) that explains the ORM process as five basic steps, four principles and a risk management process and measurement that is applied on three levels of operation; in-depth, deliberate, and time critical. As stated in OPNAVINST 3500.39C; risk is expected in all military tasks, training, missions, operations, and personal activities. The most common cause of task degradation or mission failure is human error, specifically the inability to regularly manage risk. ORM reduces the risks by identifying hazards and measuring and controlling the expected risks, allowing decisions to be made that compare risks against the mission benefits. Navy personnel are responsible for managing risk in all tasks while leaders are responsible for ensuring proper procedures are in place and appropriate resources are available for personnel to perform assigned tasks. The Navy vi sion according OPNAVINST 3500.39C is; to develop an environment in which every officer, enlisted, or civilian person is trained and motivated to personally manage risk in everything they do, including on- and off-duty evolutions in peacetime and during conflict, therefore enabling successful completion of any task and mission. Keywords: Operational Risk Management, OPNAVINST 3500.39C I. Statement and significance of the Issue The ORM origins goes back to 1994 when The US Navy team made ORM an integral part of planning, training, and operations. This stemmed from a need to improve operational readiness in peacetime-and to achieve success in combat-during a period of reduced resources and personnel. The Department of the Navy (DON) Safety Objectives for FY 2008 and Beyond (9 Oct 07) stated; Integrate Safety and Risk Management into all on and off-duty evolutions to maximize mission readiness and to establish DON as an organization with world class safety where no mishap is accepted as the cost of doing businessà ¢Ã¢â€š ¬Ã‚ ¦Establish a risk management training continuum to ensure all DON personnel receive targeted [ORM] training and that all formal professional training courses are infused with examples of how effective risk management improves both safety and mission readiness.. Risk is common nature in all military tasks, training, missions, operations, and personal activities. The most common cause of task degradation or mission failure is human error, specifically the inability to regularly manage risk (OPNAVINST 3500.39C, 2010). Navys goal is; to develop an environment in which every officer, enlisted, or civilian person is trained and motivated to personally manage risk in everything they do, including on- and off-duty evolutions in peacetime and during conflict, therefore enabling successful completion of any task and mission (OPNAVINST 3500.39C, 2010). The ORM process minimizes risks to acceptable levels, commensurate with task or mission accomplishment. Correct application of the ORM process will reduce losses and associated costs resulting in more efficient use of resources. Zero risk is not the intent of ORM. Risk management is a continuous process that is integral from the strategic level of planning through the tactical level and execution. It is a tool to help improve mission readiness and mission accomplishment. The ORM benefits when applying the ORM process ensures mission or task success by providing more effective use of resources, improving on- and off-duty risk decision making, reducing injury and property damage, and improving the readiness of all personnel (FAA System Safety Handbook, Chapter 15, 2000) ORM is a process that assists organizations and individuals in making informed risk decisions in order to reduce or offset risk, thereby increasing operational effectiveness and the probability of mission success. The ORM process is applicable across the spectrum of operations and tasks. It should be used by everyone all the time, whether on- or off-duty in their military or civilian life. II. Review of Relevant Research What is ORM? The term Operational Risk Management (ORM) is defined as a continual cyclic process which includes risk assessment, risk decision making, and implementation of risk controls, which results in acceptance, mitigation, or avoidance of risk, (OPNAVINST 3500.39C, 2010). ORM is the oversight of operational risk, including the risk of loss resulting from inadequate or failed internal processes and systems; human factors; or external events. How does it work? The ORM process assists you in making smart and informed decisions. Actually, we apply ORM every day. At times, we may not even be aware of it as you carry out a task or mission. An example of this is as simple as crossing the street; we look both ways because we were taught this at a young age. However, today we dont even look at this as risk management, but something that we know is the right thing to do before crossing the street. Every person has a role to play in managing risk during a commands task or mission, and every person is vital to the success of the Navy team, (ORM Fundamentals, Navy Knowledge Online, 2011). The Five Steps The ORM process is a systematic, continuous, and repeatable process that consists of five basic steps (OPNAVINST 3500.39C, 2010). Identify hazards Assess hazards Make risk decisions Implement controls Supervise (and watch for changes) The first two steps comprise the risk assessment portion of ORM and provide enhanced awareness and understanding of a given situation. This awareness builds confidence and allows for timely, efficient, and effective protective measures. The remaining three steps are the essential follow-through actions to either eliminate the hazard or mitigate the risks. The Four Principles. ORM incorporates the following four principles (OPNAVINST 3500.39C, 2010): 1. Accept Risk When Benefits Outweigh the Cost 2. Accept No Unnecessary Risk 3. Anticipate and Manage Risk by Planning 4. Make Risk Decisions at the Right Level 1. Accept Risk When Benefits Outweigh the Cost The process of weighing risks against the benefits and value of the mission or task helps to maximize success. Balancing costs and benefits can be a subjective process. Therefore, personnel with knowledge and experience of the mission or task must be engaged when making risk decisions (OPNAVINST 3500.39C, 2010). The goal of ORM is not to eliminate risk but to manage the risk so that the mission or task both on- and off-duty can be successful. The bottom line is, if no benefit can be achieved then do not take the risk. 2. Accept No Unnecessary Risk If all detectable hazards have not been identified, then unnecessary risks are being accepted. Additionally, an unnecessary risk is any that, if taken, will not contribute meaningfully to mission or task accomplishment or will needlessly jeopardize personnel or material. The risk management process identifies hazards that might otherwise go unidentified and provides tools to reduce or offset risk. The acceptance of risk does not equate to the imprudent willingness to gamble. Take only risks that are necessary to accomplish the mission or task (OPNAVINST 3500.39C, 2010). 3. Anticipate and Manage Risk by Planning Integrating risk management into planning as early as possible provides the greatest opportunity to make well-informed risk decisions and implement effective risk controls. This enhances the overall effectiveness of ORM and often reduces costs for your organization and yourself when off duty (OPNAVINST 3500.39C, 2010). 4. Make Risk Decisions at the Right Level Anyone can make a risk decision. However, the appropriate decision maker is the individual who can eliminate or minimize the hazard, implement controls to reduce the risk, or accept the risk. Leaders at all levels must ensure that their personnel know how much risk they can accept and when to elevate the decision to a higher level. Ensuring that risk decisions are made at the appropriate level will establish clear accountability. Therefore, those accountable for the mission must be included in the risk management process. If the commander, leader, or individual responsible for executing the mission or task determines that the controls available to them will not reduce risk to an acceptable level, they must elevate the risk decisions to the next level in the chain of command (OPNAVINST 3500.39C, 2010). Risk Assessment Matrix ORM Matrix Card OPNAVINST 3500.39C, (2010). Risk Assessment Matrix. Retrieved from http://safetycenter.navy.mil/ 1 March, 2011. This Matrix uses Risk as an expression of possible loss, adverse outcome, or negative consequences; such as injury or illness in terms of probability and severity of failure (Salas Maurino, 2010, p. 57). Risk Assessment is a structured process to identify and assess hazards. An expression of potential harm, described in terms of severity, probability, and exposure to hazards. Accomplished in the first two steps of the ORM process. Risk Assessment Code (RAC) is an expression of the risk associated with a hazard that combines its severity and probability into a single Arabic numeral which can be used to help determine hazard abatement priorities. This is typically accomplished through the use of the risk assessment matrix. The basic RACs are: 1-Critical, 2-Serious, 3-Moderate, 4-Minor, and 5-Negligible. Another definition not included in this matrix is, Residual Risk and that will be the Risk remaining after controls have been identified and selected. Bringing back the concept that Zero Risk is not the primary purpose of ORM. Also, for the use of this matrix an Operational Analysis of the task at hand has to be made. This means a chronological or sequential list of the major events or elements in a mission or task. This is the complete picture of what is expected to happen and assures all elements of a mission or task are evaluated for all potential hazards. Very important to define what a Hazard is before assigning it a number in this matrix, because a hazard is any real or potential condition that can cause injury, illness, or death to personnel; damage to or loss of equipment or property; degradation of mission capability or impact to mission accomplishment; or damage to the environment, this is also synonymous with the term threat. Last for this chart is the Risk Decision or the ability to make a decision to accept or not accept the risk(s) associated with an action; made by the commander, leader, or individual responsible for performing that action. The Three Levels The risk management process is applied on three levels: in-depth, deliberate, and time critical. The basic factor that differentiates each level is time; that is the amount of time available to dedicate to the preparation and planning of missions or tasks (OPNAVINST 3500.39C, 2010). There is no definitive separating line between the three levels (in-depth, deliberate, and time critical. It is important to know we have resources to tap into. At each level of the planning process, hazards and associated risks are identified and appropriate controls are developed and implemented. These controls become resources upon which we can draw for the next level of planning and ultimately for execution. III. Summary of Major Findings and Conclusions On and Off-duty mishaps are extremely detrimental to the Navys operational capability. Because the Navy works as a team 24/7, the actions one person takes can affect the readiness and operational capability of the commands mission or task, therefore affecting the Navy as a whole. Thus, we must constantly be aware of all risks involved in our everyday off-duty activities. Benefits of using ORM: Reduction of operational loss. Lower compliance/auditing costs. Early detection of unlawful activities. Reduced exposure to future risks. The ORM process minimizes risks to acceptable levels, commensurate with task or mission accomplishment. Correct application of the ORM process will reduce losses and associated costs resulting in more efficient use of resources. IV. Recommendations All Navy military, civilian, and contractors under the direct supervision of government personnel should apply the ORM principles and processes in all activities in order to optimize mission success and maintain readiness. Leadership should be held accountable for the use of ORM processes in their command. An organizations success requires the commitment of leaders to manage risk while meeting the commands mission. Leaders must lead by example and provide thorough policies and goals, with buy-in from all personnel. All personnel must fully trust that they have the support for risk decisions made in the interest of completing the mission, while also recognizing that intentional breaches of regulations will not be tolerated. The responsibilities as a Leader and /or Commanding Officer, or officer-in-charge should include: Establish command policy and expectations for the application of ORM on- and off-duty. Address the ORM process in mission, training, safety, and lessons learned reports. Inform the chain of command of those hazards identified by the ORM process that cannot be controlled or mitigated at the command level. Ensure ORM risk decisions are being made at the appropriate level within the command.

Procedures For Drill String Design Engineering Essay

Procedures For Drill String Design Engineering Essay This chapter presents general procedures for drill string design. The design aspects of critical importance and factors controlling drill pipe selection are highlighted. The term Drill Stem is used to refer to the combination of tubulars and accessories that serve as a connection between the rig and the drill bit (RGU lecture slides). It consists mainly of Drill Pipe, Drill Collars (DC) and Heavy Weight Drill Pipes (HWDP) and accessories including bit subs, top drive subs, stabilisers, jars, reamers etc. Drill stem is often used interchangeably with the term Drill String which actually refers to the joints of drill pipe in the drill stem. For the purpose of this report, Drill String will be used to refer to the string of drill pipes that together with drill collars and heavy weight drill pipe make up the drill stem see fig 3.1. 3.1 DRILL STEM COMPONENT DESCRIPTION 3.1.1 Drill Pipe The drill pipes are seamless pipes usually made from different steel grades to different diameters, weights and lengths. They are used to transfer rotary torque and drilling fluid from the rig to the bottom hole assembly (drill collars plus accessories) and drill bit. Each drill pipe is referred to as a joint, with each joint consisting of a pipe body and two connections (see fig 3.2). Drill pipe lengths vary, and these different lengths are classified as ranges, the available or more common ranges include: Range 1: 18 22 ft Range 2: 27 30ft Range 3: 38 40ft. Drill Stem. Fig 3.1: Drill Stem with components. (Heriott Watt University lecture Notes: Drilling Engineering) Drill pipes are also manufactured in different sizes and weights which reflects the wall thickness of the drill pipe. Some common sizes and their corresponding weights include 31/2 in. 13.30 lb/ft and 4 1/2in. 16.60 lb/ft. The indicated weight is the nominal weight in air (pipe body weight excluding tool joints) of the drill pipe. A complete listing of API recognised drill pipe sizes, weight and grades are published in the API RP 7G. The drill pipe grade is an indication of the minimum yield strength of the drill pipe which controls the burst, collapse and tensile load capacity of the drill pipe. The common drill pipe grades are presented in the table below Grade Yield Strength, psi Letter Designation Alternate Designation D D-55 55,000 E E-75 75,000 X X-95 95,000 G G-105 105,000 S S-135 135,000 Table 3.1: Drill Pipe Grades. Drill pipes are often used to drill more than one well, therefore in most cases the drill pipe would be in a worn condition resulting in its wall thickness being less than it was when the drill pipe was brand new. In order to identify and differentiate drill pipes, they are grouped into classes. The different classes are an indication of the degree of wear on the wall thickness of the drill pipe. The classes can be summarised as follows according to API standards: New: Never been used, with wall thickness when to 12.5% below nominal. Premium: Uniform wear with minimum wall thickness of 80%. Class 2: Allows drill pipe with a minimum wall thickness of 70%. It is essential that the drill pipe class be identified in drill pipe use or design, since the extent of wear affects the drill pipe properties and strength. When specifying a particular joint of drill pipe, the class, grade, size, weight and range have to be identified, the specification could therefore appear thus: 5 19.5 lb/ft Grade S Range 2 Fig 3.2: Parts of Drill pipe. (Handbook for Petroleum and Natural gas) 3.1.2 Tool Joints Tools joints are screw type connections welded at the ends of each joint of a drillpipe. The tool joints have coarse tapered threads and sealing shoulders designed to withstand the weight of the drill string when it is suspended in the slips. Tool joints are of two kinds; the pin (male section) and the box (female section). Each drill pipe has a pin attached to one end and a box attached at the other end. This makes it possible for the pin of one joint of drill pipe to be stabbed into box of a previous drill pipe. There are several kinds of tool joints widely used: Joint Type Diagram Description Internal Upset (IU) Tool joint is less than the pipe. Tool joint OD is approximately the same as the pipe. Internal Flush (IF) Tool joints ID is approximately the same as the pipe. The OD is upset. Internal / External Upset (IEU) Tool joint is larger than the pipe such that the tool joint ID is less than the drill pipe. The tool joint OD is larger than the drill pipe. Table 3.2 Types of tool joints. (The Robert Gordon University Lecture Notes: Drill String Design) 3.1.3 Drill Collars Drill collars are thick walled tubes made from steel. They are normally the predominant part of the bottom hole assembly (BHA) which provides Weight on Bit (WOB). Due to the large wall thickness of the drill collars, the connection threads could be machined directly to the body of the tube, thereby eliminating the need for tool joints (see fig 3.3). Drill collars are manufactured in different sizes and shapes including round, square, triangular and spiral grooved. The slick and spiral grooved drill collars are the most common shapes used currently in the industry. There are drill collars made from non-magnetic steel used to isolate directional survey instruments from magnetic interference arising from other drill stem components. The steel grade used in the manufacture of drill collars can be much lower than those used in drill pipes since they are thick walled. Functions Provide weight on bit Provide stiffness for BHA to maintain directional control and minimise bit stability problems. Provide strength to function in compression and prevent buckling of drill pipes. Fig 3.3: Carbon Steel Drill Pipes. 3.1.4 Heavy Weight Drill Pipe Heavy weight drill pipes (HWDP) are often manufactured by machining down drill collars See fig 3.4. They usually have greater wall thickness than regular drill pipe. HWDP are used to provide a gradual cross over when making transition between drill collars and drill pipes to minimise stress concentration at the base of the drill pipe. These stress concentrations often result from: Difference in stiffness due to the difference in cross-sectional area between the drill collar and drill pipe. Bit bouncing arising from rotation and cutting action of the bit. HWDP can be used in either compressive or tensile service. In vertical wellbores it is used for transition and in highly deviated wells, it used in compression to provide weight on bit. Fig 3.4: Heavy Weight Drill Pipe. (Heriott Watt University lecture Notes: Drilling Engineering) 3.1.5 Accessories Drill Stem accessories include: Stabilisers: these are made of a length of pipe with blades on the external surface. The blades are spiral or straight, fixed or mounted on rubber sleeves to allow the drill string rotate inside. Functions of the stabiliser include: Stabilise the drill collars to reduce buckling and bending Ensure uniform loading of tricone bits to reduce wobbling and increase bit life. To provide necessary wall contact and stiffness behind the bit to induce positive side force to build angle when drilling deviated wells. Reamers: used in the BHA to enlarge the well bore diameter and ream out doglegs, key seats, ledges. Drilling Jars: incorporated in the BHA to deliver a sharp blow and assist in freeing the drill string should it become stuck. 3.2 DRILL STRING DESIGN The drill string design is carried out in order to establish the most efficient combination of drill pipe size, weight, and grades to fulfil the drilling objectives of any particular hole section at the lowest cost within acceptable safety standards. In order to design a drill string to be used in a particular hole section, the following parameters need to be established: Hole section depth Hole section size Expected mud weight Desired safety factors in tension and overpull. Desired safety factor in collapse Length of drill collars required to provide desired WOB including OD, ID and weight per foot. Drill pipe sizes and inspection class The drill string design has to meet the following requirement: The working loads (tension, collapse, burst) on the drill string must not exceed the rated load capacity of each of the drill pipes. The drill collars should be of sufficient length to provide all required WOB to prevent buckling loads on the drill pipe. The drill pipes used have to ensure the availability of sufficient fluid flow rate at the drill bit for hole cleaning and good rate of penetration. 3.2.1 Design Safety Factors Design safety factors are applied to calculated working loads to account for any unexpected service load on the drill string. They are used to represent any features that are not considered in the load calculations e.g. temperature and corrosion, thus ensuring that service loads do not exceed the load capacity of the drill pipe. Design safety factor values are often selected based on experience from operating within a particular area, the extent of uncertainty in the operating conditions e.g. when operating in HPHT conditions, a larger safety factor is applied than when operating in less harsh conditions. Some commonly used design safety values are illustrated in the table below Load Design Safety Factor Value Tension 1.1 1.3 Margin of overpull (MOP) 50,000 100,000. MOP of 400,000 have been used in ultra deep wells Weight on Bit 1.15 or 85% of available Weight on bit to ensure neutral point is 85% of drill collar string length measures from the bottom (API RP 7G) Torsion 1.0 (based on the lesser of the pipe body or tool joint strength) Collapse 1.1 1.15 Burst 1.2 3.2.2 Drill Collar Selection The drill collars are selected with the aim of ensuring that they provide sufficient WOB without buckling or putting the lower section of the drill string in compression. 3.2.2.1 Size selection Lateral movement of the drill bit is controlled by the diameter of the drill collar directly behind it. Therefore the size/diameter of the drill collar closest to the bit will be dependent on the required effective minimum hole diameter and the relationship can be given as When two BHA components of different cross-sectional areas are to be made up, it is essential that the bending resistance ratio (BRR) be evaluated. This is important because BHA components have tensile and compressive forces acting on them when they are bent in the well bore. These forces cause stress at connections and any location where there is a change in cross-sectional area. Therefore it is important to ensure that these stresses are within acceptable ranges. The bending resistance (BR) of a drill string component is dependent on its section modulus which is given as Z = section modulus, in3 I = second moment of area, in4 OD = outside diameter, in ID = inside diameter, in The BRR is used to express any change in BR and can be calculated using BRR should generally be below 5.5 and in severe drilling conditions, below 3.5. 3.2.2.2 Connections When selecting connections to be used with drill collars, it is essential to check that the BRR of the pin and box indicates a balanced connection. The BRR for drill collar connection is calculated as the section modulus of the box divided by the section modulus of the pin. The API RP 7G contains tables that can be used to determine BRR for any box and pin OD. BRRs of 2.5 have given balanced connections (RGU Lecture notes, 2005). 3.2.2.3 Weight on Bit The maximum weight on bit required is normally a function of the bit size and type. The rule of thumb is: Maximum WOB of 2000lbf per inch of bit diameter when using Polycrsyalline Diamond Compact bits (PDC) and mud motors. Maximum WOB of 5000lbf per inch of bit diameter when using tricone bits. Other factors controlling WOB include inclination, hole size and buckling. In vertical wellbores the length of drill collars required to provide a specified weight on bit is given by LDC = Length of Drill Collars, ft WOB = Weight of Bit, lb DFBHA = Safety factor to keep neutral point in drill collars. WDC = Weight per foot of Drill Collars, lb/ft Kb = Buoyancy Factor. The neutral point as described by (Mian, 1991) referring to Lubinksi, is the point that divides the drill stem into two portions, with the section above the neutral point in tension and that below in compression. Therefore in order to ensure that the entire length of drill pipes remain in tension, the neutral point of the drill stem has to be maintained within the drill collars. According to the API RP 7G, the height of the neutral point measured from the bottom of the drill collars will be 85% of the total length of drill collars used, with 85% being the safety factor. In inclined wellbores, the angle of inclination has to be taken into consideration when calculating the maximum WOB that can be applied without buckling the drill pipe. This is because although the WOB is applied at the inclination of the wellbore, this weight acts vertically, thus reducing the available weight at the bit. Therefore to allow for this reduction, the buoyed weight of the BHA would be reduced by the cosine of the well inclination, thus WOB in inclined holes is calculated with the formula All parameters remain as defined in equation 5; ÃŽÂ ¸ is the angle of inclination of the well. As a result of the vertically acting weight of the BHA, the drill string tends to lie on the low side of the hole and is supported to some extent by the wall of the well bore. Therefore the pipes above the neutral point could only buckle if the compressive forces in the drill string exceed a critical amount. This critical buckling force is calculated as follows Fcrit = critical buckling force, lb ODHWDP = outside diameter of HWDP, in. ODtj = maximum outside diameter of pipe, in. IDHWDP = inside diameter of HWDP, in. Kb = buoyancy factor. Dhole = diameter of hole, in. ÃŽËÅ" = hole inclination, degrees. Since HWDP are sometimes used to apply WOB in inclined wells, and drill pipes are sometimes used in compression, the critical buckling force is calculated for both HWDP and drill pipes. 3.2.3 Drill Pipe Selection Factors to be considered for drill pipe selection include: Maximum allowable working loads in tension, collapse, burst, and torsion. Maximum allowable dogleg severity at any depth in order to avoid fatigue damage in the drill pipe. Combined loads on the drill pipe. The loads considered when selecting drill pipes to be used in the drill string is dependent on the well depth, well bore geometry and hole section objectives. In shallower vertical wells, collapse and tension are of more importance than burst or torsion. Burst is normally not considered in most designs since the worst case for a burst load on the drill pipe would occur when pressuring the drillstring with a blocked bit nozzle, even with this condition, the burst resistance of the drill pipe is likely to be exceeded. Torsion is of less importance in vertical well bores because drag forces are at minimal amounts unlike in highly deviated wells. The dogleg severity of the well for both vertical and deviated wells is important because of increased fatigue in the drill pipe when it is rotated in the curved sections of the wellbore. A graphical method is recommended for drill pipe selection, with the loads plotted on a load versus depth graph. This makes it possible for loads at particular points on the drill string to be easily visualised, and any sections of the drill pipe that do not meet the load requirements are easily identified and redesigned. 3.2.3.1 Collapse Drill pipes are sometimes exposed to external pressures which exceed its internal pressures, thereby inducing a collapse load on the drill pipe. The worst scenario for collapse in a drill pipe is during drill stem tests when they are run completely empty into the wellbore. The collapse loads are highest at the bottom joint of the drill pipes, as a result, the collapse load would normally control the drill pipe grade to be used at the bottom of the drill string. The API specified collapse resistance for different sizes and grades of drill pipe assuming either elastic, plastic or transition collapse depending on their diameter to wall thickness ratio have been calculated and are published in the API RP 7G with the relevant formulae. The maximum collapse pressure on the drill pipe when it is completely empty can be calculated as follows: Pc = collapse pressure, psi MW = mud weight, ppg TVD = true vertical depth at which Pc acts, ft. On some occasions, the mud weight outside the pipe varies from that inside the pipe, also the fluid levels inside and outside the pipe may also vary. This situation could also induce collapse loads. The collapse loads induced by this scenario can be calculated thus L = Fluid depth outside the drill pipe, ft MW = Mud weight outside the drill pipe, ppg Y = fluid depth inside drill pipe, ft MW = Mud weight inside drill pipe, ppg. The value for Pc is then plotted on the collapse load graph as the collapse load line see fig 3.5. It is recommended practice to apply a design safety factor to the collapse load calculated from equations 8 or 9 (depending on expected scenarios) in order to account for unexpected additional loads as wells as unknown variables. The value of the design factor is often between 1.1 1.5 for class 2 drill pipes. According to (Adams, 1985) the design factor should be 1.3 to account for the fact that new drill pipes are often not used for drill stem tests. The value of the collapse load multiplied by the collapse design factor is plotted on the collapse load graph as the design line, this is then used to select an appropriate grade and weight of drill pipe to fulfil these load conditions. Fig 3.5: Sample Collapse load graph. 3.2.3.2 Tension Load The tensile load capacity of the drill string should be evaluated to ensure there is enough tensile strength in the topmost joint of each size, weight, grade and class of to support the weight of the drill string submerged in the wellbore, hence the need to include buoyancy in the calculations. There has to also be enough reserve tensile strength to pull the drill string out of the well if the pipe gets stuck. The stabiliser and bit weight can be neglected when calculating the drillstring weight. In a vertical wellbore, the forces acting on the drill string are tension from its self weight and the hydrostatic pressure from the fluid in the wellbore. The hydrostatic pressure in the wellbore exerts an upward force on the cross sectional area of the drill string, which is commonly referred to as buoyancy. Therefore the resulting tensile load on the drill string attached to drill collars, taking account of buoyancy is calculated as: FTEN = resultant tensile load on drill string, lb LDP = length of drill pipe, ft LDC = length of drill collars, ft WTDP = air weight of drill pipe, lb/ft WTDC = air weight of drill collars, lb/ft MW = Mud weight, ppg. ADC = Cross sectional area of drill collars, in2 FTEN is plotted on the tension load graph as the tensile load line. The tensile strength values for different sizes, grades and inspection classes of drill pipes are contained in the API RP 7G, and can be calculated from the equation: Fyield = minimum tensile strength, lb Ym = specified minimum yield stress, psi A = cross section area, in2 Fyield is plotted as the minimum tensile strength line on the tension load graph. However, these values (Fyield) are theoretical values based on minimum areas, wall thickness and yield strength of the drill pipes. Therefore, these values only give an indication of the stress at which a certain total deformation would occur and not the specific point at which permanent deformation of the material begins. If a pipe is loaded to the minimum tensile strength calculated from equation 11, there is the possibility that some permanent stretch may occur, thereby making it difficult to keep the pipe straight in the wellbore. In order to eliminate the possibility of this occurrence, 90% of the minimum tensile strength as recommended by the API (American Petroleum Institute), should be used as the maximum allowable tensile load on the drill pipe, i.e Fdesign = maximum allowable tensile load 0.9 = a constant relating proportional limit to yield strength. Fdesign is plotted on the tension load graph as the maximum allowable tensile load line. As with the collapse load, a design factor would be applied to the tensile loads to account for dynamic loads in the drill pipe which occur when the slips are set, as well as prevent the occurrence of pipe parting close to the surface. The product of FTEN and the design factor is plotted as the tension design load line in the tension load graph see fig 3.6. Margin Of Overpull A margin for overpull is added to the tension load to ensure there is sufficient tensile strength in the drill pipe when it is pulled in the event of a stuck pipe. This margin is normally 50,000 100,000lb, but in deeper wells margins of overpull have reached 300,000lb. The value obtained after adding the margin of overpull is also plotted on the tension load graph see fig 3.6. The difference between the calculated tensile load at any point in the drillstring (FTEN) and the maximum allowable tension load would also represent the available overpull. This value represents available tensile strength of the drill pipe to withstand any extra forces applied to the drill string when trying to release it from a stuck pipe situation. FTEN and Fa can also be expressed as a safety factor This safety factor is an indication of how much the selected drill pipe will be able to withstand expected service loads. Due to uncertainty with actual service loads and conditions, a safety factor greater than 1 is always required. Slip Crush Slip crushing is generally not a problem if the slips are properly maintained. However, it is necessary to apply a safety factor for slip crushing when designing the drill string. This helps account for the hoop stress (SH) caused by the slips and the tensile stress (ST) caused by the weight of the drill string suspended in the slips. This relationship between SH and ST can be represented by the following equation SH = hoop stress, psi ST = tensile stress, psi D = outside diameter of the pipe, in. K = lateral load factor on slips, Ls = length of slips, in. = slip taper usually 9 ° 27 45 z = arctan ÃŽÂ ¼ ÃŽÂ ¼ = coefficient of friction, (approximately 0.08) The calculated tensile load is multiplied by the slip crush factor () to obtain the equivalent tensile load from slip crushing: Ts = tension from slip crushing, lb TL = tension load in drill string, lb SH / ST = slip crush factor. Ts is also plotted on the tension load graph as the slip crush design line. Fig 3.6: Sample Tension load graph The general step-by-step procedure for drill pipe selection using the graphical method is given as 1. Calculate the expected collapse load on drill pipe and apply the collapse design safety factor to derive the design load. Use the result to select weight and grade of drill pipe that satisfy collapse conditions. Plot expected collapse load and design load on a pressure vs. depth graph. 2. Calculate maximum allowable tensile load for the drill pipe selected in (1) above. Also calculate tension load on the drill string including buoyancy effects. Plot the tension load, specified minimum yield strength, and maximum allowable tensile load values on axial load vs. depth graph. 3. Apply tension design factor, margin of overpull, and slip crush factor to the calculated tension load and plot the individual results on the axial load vs. depth graph. Of the three factors applied to the tension load, the one resulting in the highest value is selected as the worst case for tensile loads. 4. Inspect graph and re-design any sections not meeting the load requirements. When designing a tapered drill string, the maximum length of a particular size, weight, grade and class of drill pipes that can be used to drill the selected hole section with specified WOB can be calculated as: All parameters remain as defined in equation 10 and 11. Note that equation 16 is only used when the MOP design line is the worst case scenario for tensile loads. When slip crushing is the worst case, the formula below is used SF = safety factor for slip crushing. The lightest available drill pipe grade should be used first in order to ensure that that the heavier grades are used upper section of the drill string where tensile loads are the highest. 3.2.4 Dog Leg Severity Fatigue damage is the most common type of drill pipe failure. It is known to be caused by cyclic bending loads induced in a drill pipe when it is rotated in the curved sections of the wellbore. The rotation of the drill pipe in the curved hole sections induce stresses in the outer wall of the drill pipe by stretching it and increasing its tensile loads. Fatigue damage from doglegs tends to occur when the angle exceeds a critical value. This critical value can be calculated as: C = maximum permissible dog leg severity, deg/100ft E = Youngs modulus, psi (30 x 106 for steel, 10.5 X 106 for aluminium) D = Drill pipe outer diameter, in. L = half the distance between tool joints, (180 in, for range 2 pipe) T = tension below the dogleg, lb à Ã†â€™b = maximum permissible bending stress, psi. I = drill pipe second moment of area, = à Ã†â€™b, is calculated from the buoyant tensile stress (à Ã†â€™t) and is dependent on the grade of the pipe. à Ã†â€™t = T/A, where T is defined in equation 19, and A is the cross sectional area of the pipe body in in2. For grade E pipe, The results from equation 20 are valid for à Ã†â€™t values up to 67,000psi. For grade S pipe, The results from equation 21 are valid for à Ã†â€™t values up to 133,400psi. It is recommended that an allowable dogleg severity (DLS) versus depth chart be plotted for every hole section with a particular drill string design since DLS changes with depth. The chart is plotted with the DLS on the x-axis and depth on the y-axis (see fig 3.7). When DLS lies to the left of the line or below the curve, the drill pipe is in safe operating conditions, and when it falls above or to the right of the curve, it is in unsafe conditions. Fig 3.7: Allowable Dogleg Severity Chart. (Mian, 1991) 3.2.5 Torsion Drill pipe torsional yield strength is important when planning deviated wells and ultra deep wells. In deviated wells, increased drag forces acting on the drill string from its interaction with the wellbore increase torsional loads on the drill pipe. In deeper wells, it is important in stuck pipe situations, in order to know the maximum torque that can be applied to the drill string. The pipe body torsional yield strength when subjected to torque alone can be calculated from the equation: Q = minimum torsional yield strength, ft lb J = polar second moment of area, à Ã¢â€š ¬/32 (D4 d4) D = pipe OD in, d = pipe ID in. Ym = minimum yield strength, psi. 3.2.6 Combined Loads On The Drill String Collapse and Tension The collapse resistance of the drill pipe is often reduced when the drill pipe is exposed to both tension and collapse loads. This happens because tensile loads stretch the drill pipe thereby affecting its D/t (diameter -wall thickness ratio) which controls the collapse resistance of the drill pipe. In ultra deep wells, the effect of combined collapse and tension is experienced when function testing the Blow out Preventers (BOP). It is becoming common practice in ultradeep drilling to equip BOPs with test rams in order to enable the BOP be tested without setting plugs in the well head. This is done to save tripping time due to extreme well depths. An example given by (Chatar, 2010), using 65/8in 27.70lb/ft drill pipe showed that with 65/8in drill pipe having 860kips of maximum allowable tensile loads, at half of this load, the drill string is only capable of withstanding 4,500psi collapse loads, which is often not sufficient for ultradeep drilling BOPs. The corrected collapse resistance of drill pipes under tension can be calculated using the formula Where R represents the percentage of the collapse resistance left when the drill pipe is under tension, therefore in equation 25, the value for R is used to multiply the normal plastic collapse resistance of the pipe to give the collapse resistance under tension. R can also be determined graphically with the following steps 1. Calculate Z using equation 24 2. Enter the ellipse for biaxial stress (fig 3.8) on the horizontal axis with the value for Z and draw a vertical line to the ellipse curve. 3. Draw a horizontal line from the vertical line drawn in (2) above to the vertical axis and read off the value. 4. Use the value from (5) above to multiply the collapse resistance to get the corrected collapse resistance with tension. Fig 3.8: Ellipse of Biaxial yield Strength: Effect of tensile loading om collapse resistance. (RGU Lecture notes: Casing design) Combined tension and torsion The torsional yield strength of a drill pipe is significantly reduced when the pipe is under tension loads. The torsional yield strength of the drill pipe under tension can be calculated with the equation Q = minimum torsional yield strength under tension, ft lb J = polar second moment of area. D = pipe OD in, d= pipe ID in. Ym = minimum yield strength, psi P = total load in tension, lb A = cross sectional area, in2 3.2.7 Tool Joint Performance The makeup torque to be applied to the tool joints when connecting drill pipes is calculated as follows ID = inside diameter, in. OD = outside diameter, in. Values for X, M, B and Q for standard connections are presented in the table below Type of Connection X

The Four Political Parties Of Canada Essay -- Canadian Politics Politi

The Four Political Parties of Canada   Ã‚  Ã‚  Ã‚  Ã‚  In a country as vast and as culturally diverse as Canada, many different political opinions can be found stretched across the country. From the affluent neighbourhoods of West Vancouver to the small fishing towns located on the east coast of Newfoundland, political opinions and affiliations range from the left wing to the right wing. To represent these varying political views, Canada has four official national political parties to choose from: the Liberals (who are currently in power), the Progressive Conservatives, the New Democrats, and the Reform Party. What is particularly interesting is that none of the latter three parties compose Her Majesty's Official Opposition in the House of Commons. The Bloc Quebecois, a Quebec separatist party who only ran candidates in the province of Quebec in the last federal election in 1993, won 54 seats in that province, and claimed the title of Her Majesty's Loyal Opposition over the Reform Party, who garnered only 52 seats. Because the Bloc ran candidates only in Quebec, it would be difficult to think of them being a national political party, even though they hold a significant number of seats in the national legislature. This paper will examine the significant early history of Canada's four main national political parties, and then will analyse their current state, referring to recent major political victories/disasters, and the comparison of major economic policy standpoints, which will ultimately lead to a prediction of which party will win the next federal election in Canada.   Ã‚  Ã‚  Ã‚  Ã‚  Starting on the far left, there is the New Democratic Party of Canada. Today's modern New Democratic Party was originally called the Co-operative Commonwealth Federation (CCF), and was founded in 1932. Originally led by a man by the name of James Shaver Woodsworth, the CCF was formed by several radical farming groups who found out that they had more similarities with each other than just their destitution. The 1920's had been a dark period for radicals and unions within Canada; poverty and significantly lower wages for workers were prevalent, and apathy regarding these issues was rampant. When the depression wove its destructive web across Canada in the 1930s, proponents of capitalism were staggered, but their left-wing opponents were too busy coming to the aid o... ... into the 21st century, however, will be made in the soon-to-be- called Canadian federal election. Democracy will speak out once again. BIBLIOGRAPHY (1996) A Fresh Start for Canadians [Online]. Available: http://www.reform.ca/FreshStart/summary.html [1997, Feb.25]. Guy, John J. People, Politics and Government. Scarborough: Prentice Hall, 1995. Harrison, Trevor. Of Passionate Intensity. Toronto: University of Toronto Press, 1995. (1996) Liberal Party of Canada [Online]. Available: http://www.liberal.ca/english2/policy/red_book/chapter1.html [1997, Feb.25]. Macquarrie, Heath. The Conservative Party. Toronto: McClelland and Stewart Limited, 1965. McMenemy, John, Winn, Conrad. Political Parties in Canada. Montreal: McGraw- Hill Ryerson, 1976. Morton, Desmond. The New Democrats, 1961-1986. Toronto: Copp Clark Pitman Ltd., 1986. (1996) New Democrats of Canada [Online]. Available: http://www.fed.ndp.ca/fndp/fairtaxnow.html [1997, Feb.25]. Progressive Conservative Party of Canada. Designing a Blueprint for Canadians. Ottawa, 1997. (1996) Progressive Conservative Youth [Online]. Available: http://www.openface.ca/PCU/library4.html [1997, Feb.25].

John Locke and Human Nature :: Second Treatise on Civil Government

In The Second Treatise of Government, Locke defines political power, discusses the inalienable birth-rights of man, and the need for both in the formation of a legitimate government. John Locke’s The Second Treatise of Government defines a legitimate government in relation to the protection of inalienable rights. He views a valid government as one which upholds his three main natural laws of life, liberty and property. In defining political power, Locke insists that it is proper to make laws â€Å"for the regulating and preserving of property,† and adds, that if necessary, â€Å"the execution of such laws, and in the defense of the common-wealth [sic] from foreign injury.† This is needed â€Å"for the public good.† (Locke, Sec. III) Defined, Locke’s political power is the ability to uphold a constitution. Locke’s reasoning for the creation of a government arises in the need to protect life, liberty and justice. Locke concludes that â€Å"the reason why men enter into society, is the preservation of their property; and the end why they choose and authorize a legislative,† but adds that the citizens â€Å"have a right to resume their original liberty †¦ by the establishment of a new legislative† (Locke, Sec. CCXXI) when those rights are threatened. The protection of life, liberty and justice then becomes the reason for a â€Å"new legislative.† The value Locke places on property is only furthered in his discussion of the will of the populace. Locke discusses in his chapter Of the Beginning of Political Societies the effect which the majority has on the betterment of the community: â€Å"For when any number of Men have, by the consent of every individual, made a Community, the have thereby made that Community one Body, with a Power to Act as one Body, which is only by the will and determination of the majority† (Locke, Sec.

Delisting the Grey Wolf Essay -- Nature Animals Extinction Essays

Delisting the Grey Wolf The United States Fish and Wildlife Service are considering removing the gray wolf from the endangered species list once Idaho, Montana, and Wyoming have enough wolves to be deemed sufficient to continue to expand the wolf population, requiring only that each of these three states have a management plan in effect to prevent the gray wolf from becoming endangered again. With the current attitude of the governments in these states, the wolf should not lose their federal support under the Endangered Species Act as it would merely serve to cause the wolves to become endangered once again, or at best, held to the absolute minimum population that the states can pass off as â€Å"viable, self-sustaining populations† (â€Å"bill†, par. 4). Idaho’s legislature makes little attempt to hide their wish to be rid of the wolves completely. Within the very text of the senate concurrent resolution that seeks the delisting of the wolves, it is stated that â€Å"The State of Idaho is on the record asking the federal government to remove wolves from the state by the adoption in 2001 of House Joint Memorial No. 5. The position reflected in House Joint Memorial No. 5 continues to be the official position of the State of Idaho† (State, 1). The grudging condensation of the legislature to put up with the wolves follows this, declaring in the war-weary voice of an unjustly put-upon that â€Å"in order to use every available option to mitigate the severe impacts on the residents of the State of Idaho, the state will seek delisting and manage wolves at recovery levels that will ensure viable, self-sustaining populations† (State, 1) which is later defined as 15 packs, with as few as 10 packs being acceptable to the st ate before control would reve... ... â€Å"Rocky Mountain Wolf Recovery 2001 Annual Report.† U.S. Fish and Wildlife Service 2001 . State Affairs Wolf Conservation/Management Plan. Senate Concurrent Resolution No. 134 15 Mar. 2002 . â€Å"Wolf foes see delisting as opportunity.† The Idaho Statesman 22 Dec. 2002 . â€Å"Wolf management bill sent to House floor.† The Idaho Statesman 14 Mar. 2002 . â€Å"Wyoming draft plan for gray wolves criticized.† The Idaho Statesman 9 Nov. 2002 . â€Å"Wyoming plan for wolves gets heat.† The Idaho Statesman 26 Nov. 2002 .

Types of Drivers

What kind of a driver are you? Are you the one to piss people off or the one to scare them and make them wonder if they will live or that safe driver that everyone wants to be? Driving is the best transportation to getting to places whenever you want. Having your license is a privilege . Not everyone has it. So be careful and take care of it and don’t go all crazy on the road because it can cause your death and others as well. There are three types of driver that you mostly see everyday or hear about. Drunk drivers have become the most dangerous drivers out on the road cause you never know till they strike someone or you on the road. These drivers come out mostly out on the weekends after a long night of clubbing; they are so drunk that they have convinced themselves that they are sober enough to operate a car. I mean come on like seriously do they not have just one friend to stay sober and be the designated driver to get home safe instead of endangering us all. If you see a car that keeps swerving lane to lane that can’t keep straight your best choice is to stay away as possible. Hopefully they’ll get caught get that DUI and maybe that’ll teach them a good lesson. The slow pokes out on the road can piss you off when you are trying to get somewhere on time. These people are scared of even passing the speed limit thinking maybe a cop might poof pop out of the air and catch them. The old folks are even worse they seriously go under the speed limit like if you can’t see or are too old to be driving to even know what is going on just stop driving it’ll save us a lot of extra time. Seriously the back roads are for me to go fast and just beat traffic but when you are driving slow then what was the point of even taking the back road you should of stayed in traffic you fools. Despite what people say fast drivers are the save drivers. Why? Must you ask? Well, we tend to drive 5 mph over the speed limit, which is acceptable, and don’t have anyone driving close to us. Fast drivers keep their eye on the road for that reason they are alert to what is going on in front of them and will generally slow down before its too late. The true safe drivers are the ones that know how to drive not just operate the car. Fast drivers only create a problem when they become truly aggressive and tailgate, passing others really close to them and cutting off without a warning. Driving is so much fun. By the way guys, the ladies find a man attractive if he has his license. She wouldn’t want to be using the train or bus for the rest of her life. Don’t expect the roads to be a racetrack because you will be endangering lots of people’s life so don’t be an idiot. Have fun out there and focus on the road don’t text and drive as well don’t drink and drive.

Warwick Thornton Essay

The films Samson and Delilah and Nana are both produced and directed by an Australian film maker named Warwick Thornton. He is renowned for the techniques he uses that reflect the director's personal creative vision during the films. This approach in film making is known as the auteur theory. Warwick Thornton directed Nana which is a short film in 2007 that includes the same character named Nana viewers see In his latter movie.He then continues on in 2009 where he directed Samson and Delilah, a full length feature film that debuted In the Cannes Film Festival. In both his films he displays the hardships faced by native Aboriginal Australians, especially the children, who suffer in and out of their communities and are normalized in society. They are also shown to rarely receive help from the government or community members. There are many similarities between the films that show a connection and bring upon Thorn's techniques in film making, such as the camera work, music/soundtrack an d lighting.These similarities highlight Thorn's producing and directing style that bring his own creative â€Å"voice† wrought both of the films. In both films music is shown to be a fundamental part of the day to day routines of the protagonists. At the beginning of the opening scene of Samson and Delilah, the song, Sunshiny Day by Charlie Pride is a country love song that suggests love can make living in a bleak and gloomy environment better. The audience Is also shown this technique present In Nana when the film begins with a cheerful and lively soundtrack while Nana Is preparing a meal.Both films have an upbeat and cheerful tone to Its background music that shows how Aboriginals ho barely have anything in life due to their isolation and poor living conditions suggest that they are still happy with their lives, especially Nana who barely has anything in her kitchen is still managing to make a meal. However as both films begin to progress through their scenes with the use o f music and background noise the viewer Is shown the problems faced in Aboriginal communities.Viewers are shown this through the use of Thornton hand held camera which he shot both of the inure film with. This use of camera work makes the viewers feel that they are part of the cone and feeling connected to the characters. In Samson and Delilah, Samson wakes up and sniffs petrol which shows the problems and addictions young people face in these Aboriginal societies. The lack of education and absence of parents who do not direct them to the right path in life attracts youths into drug and alcohol use which in many cases leads to the abuse of such substances.Even though there Is limited dialogue throughout the film between characters Warwick Thornton uses music and ambient noises as a form of a language. A reoccurring theme/issue in both films is he exploitation of Aboriginal people and their skills, mainly with their artistic work. Delilah grandmother, Kitty, is a famous Aboriginal pa inter but is exploited by members of the White Australian community. The lack of awareness faced by Aboriginals regarding the real potential and value of their paintings shows the viewers that Aboriginal painters could be far wealthier but their lack of knowledge Is conditions.The viewer is shown this form of exploitation when Delilah enters an art gallery in Alice Springs and see's one of Nana's paintings selling for $22,000, when in act a man only paid $200 to Nana in return of her painting. Kitty's painting is their main source of income that helps them pay for the goods and luxuries bought from the local convenience store and medicine from the hospital for Nana's well being. Although Kitty paints for a source of income she also does it to pass on knowledge and tradition down to Delilah as it is a way that educates and teaches her the traditions, history and culture of the Aboriginals.This form of knowledge is usually passed down orally or with the use of storytelling in the Abor iginal communities and lays a crucial role in educating younger generations and maintaining the survival of Aboriginal culture. Viewers explicitly see this happen in both in Samson and Delilah and Nana, where the elder is shown to be teaching younger community members with the aids of storytelling and painting. In Nana, the little girl's grandmother is shown numerous times to be painting together with her.Another theme which is present in both films is love, how it is a strong and powerful force that helps individuals get past the oppression and miseries faced in life. The director uses this hem to show how the characters develop a special bond and care for one and other. In Nana, the little girl's grandmother looks after her and embraces her as one of her own children. â€Å"l love my Nana, she makes me feeds when I'm hungry' this quote Justifies and supports how Nana is a loving care taker.This theme also exists in Samson and Delilah when Samson is shown hunting for a Kangaroo an d bringing it back to Delilah as he wants to show his care towards Delilah and would like to present a kind gesture. Another example of this theme is shown in the scene where Delilah grandmother passes away. When Nana passes away, Delilah is held responsible and is punished, as this is a custom in Aboriginal culture and tradition.After a period of respecting Delilah grief, Samson is driven and compelled to step into her emotional breach and in his own way protects Delilah from the isolation and rejection of the community as the members believe she is to blame for Nana's death. Love is heavily present in this scene as Samson physically steps out of his comfort zone to save Delilah and turn their backs on the community. Not only love is shown y Samson but Delilah as well. She is portrayed as a savoir due to the film techniques that present her to be such.She is purposely dressed in white and having car headlights shine behind her when Samson is looking up at Delilah, viewers are shown this by point of view camera techniques Thornton uses to show Gammon's view. This style symbolizes her as being an angel who came to save and â€Å"cleanse† Samson when he was close to suicide due to his petrol sniffing addiction. Delilah comes back to save Samson because in the end they both ultimately love each other. Both Samson and Delilah and Nana show the harsh and hard ways in which isolated Aboriginals live.Thorn's directing style brings upon his own creative voice that helps the audience to understand the issues present that Australians tend to ignore and turn a â€Å"blind eye† towards. Even if some aspects in the film may feel unintentional, nothing in Warwick Thorn's films are there by accident. Every technique, camera work, lighting and soundtrack is there to make viewers feel connected and understand the films that bring upon the truth of what Aboriginals Thorn's directing style which makes him an auteur theorist.

Hamlet – Hero or Villain

Hamlet comes across as both a hero and a villain throughout ‘Hamlet’ at different intervals. His loyalty, morality, honesty and popularity are certainly heroic traits however one can’t deny his villainous ways in his dealings with Ophelia, his killing of Polonius and most importantly his delaying of killing Claudius. Hamlet is full of faults yet full of honourable intentions. His negative qualities are slim compared to his heroic qualities therefore I believe Hamlet to be a hero, a â€Å"prince among men†. When we first meet Hamlet, he is dressed all in black and conveys all the â€Å"moods, forms and shapes of grief†.This depression is caused by his father’s recent death. Gertrude, his mother and Claudius, his uncle have noticed however Hamlet’s melancholy is much more intense than he is letting on â€Å"too too sullied flesh would melt†. He’s unable to forget his father even when all those around him have resumed their m erry lives. â€Å"I shall not look upon his like again†. This demonstrates the loyal side of the prince. His grief is further intensified by the cold-hearted actions of his mother. Gertrude married her brother in law, Claudius â€Å"within a month† of her husband’s death.Hamlet is unable to understand her disloyalty â€Å"a beast that wants discourse of reason would have mourned longer†. He believes he is living in a society with no standards and so becomes disillusioned with life â€Å"how weary, stale flat and unprofitable seem to me all the uses of this world†. His loyalty is certainly a heroic trait. The anger he felt towards his mother had a very a negative effect on a Hamlet. He began to feel anger at women as a whole which leads me to his villainous dealings with Ophelia. Hamlet feels neglected when Ophelia as ordered by her father, Polonius repels his letters.He condemns all women with the criticism of moral fickleness â€Å"fraility thy n ame is woman†. He hates Ophelia one moment and longs to engage in sexual intimacy with her the next. â€Å"Lie between maids’ legs†. He mistreats her with heartless and demeaning behaviour. In the nunnery scene he denies he ever loved her and tells her â€Å"get thee to a nunnery†. His inconsistent treating of Ophelia eventually drives her to insanity. The actual recognition of his love for Ophelia can only come when Hamlet realizes that she is dead, and free from her tainted womanly trappings â€Å"I lov’d Ophelia†.This is without doubt one of the most villainous qualities of Hamlet. His cruel treating of Ophelia however can also be seen as a heroic trait. He is honest about his feelings towards her. He is honest throughout the whole play, which is rare in ‘Hamlet’ as most of the characters live their lives through deception. He doesn’t once hide his hatred of Claudius â€Å"a little more than kin and less than kind†, he is also honest of his disliking of Polonius when he says his words have no substance â€Å"words words word†.He eventually tells his mother how disgusted he is with her marriage â€Å"O shame, where is thy blush? † and admits he treated her with cruelty â€Å"I must be cruel only to be kind†. He is even honest about his own inaction as he â€Å"lets all sleep†. His honesty throughout the play is admirable and only further proves him to be a hero. He is without doubt a man of high morals which is an important feature of a hero. He agrees to avenge his father even though he almost crushed with the burden. â€Å"oh cursed spite that ever I was born to set it right†.It is clear that he does not want to murder but accepts the task nonetheless â€Å"I have sworn’t†. He also apologises to Laertes for killing Polonius and asks for forgiveness. â€Å"give me your pardon, sir I have done you wrong†. His moral character is what I m ost admire about Hamlet. However Hamlet’s bravery for accepting the burden of revenge only heightens our awareness of his most negative quality, inaction. Faced with evidence that his uncle murdered his father, Hamlet becomes obsessed with proving his uncle’s guilt.He delays the moment of revenge for as long as he possibly can. He even passes up the perfect chance to kill Claudius in the courtyard when he is praying claiming if he kills him now he is only sending him to heaven. â€Å"this is hire and salary, not revenge†. Hamlet is aware of his inaction and is very self-critical of it. He admires the player’s passion in the play and become annoyed at himself for being â€Å"unpregnant of my cause†. He is made further aware of his inaction when the young Fortinbras fights for land â€Å"that had nothing in but the name† while he â€Å"lets all sleep†.His procrastination is his biggest fault and is his ultimate downfall in the play. Ina ction is certainly not a heroic characteristic. After Hamlet returns from England he is a changed man. He tells how Horatio how â€Å"there’s a divinity that shapes our ends†. It is becoming clear that Hamlet now sees the role of avenger in a different light than he did earlier in the play. As a true hero he is conscious of the fact that he is acting as an agent of justice. This new attitude remains with Hamlet right through to the play’s conclusion.Claudius invites him to engage in a duel with Laertes and Hamlet freely embraces the challenge. Hamlet seems to be more self-confident about his own ability to take clear, effective action. We are given the picture of a noble and fine young man in the concluding scenes. He finally gets revenge on Claudius however is stabbed by Laertes by doing so. A true hero who sacrifices himself to bring justice and honesty back to the state of Denmark, even his enemy Fortinbras admits he would have â€Å"proved most royal† for the throne.Hamlet is a truly much loved prince who possesses a vast degree of human virtue and ability and whose death is not only tragic but extremely noble. His villainous qualities, however strong in the beginning, truly evaporate as the play concludes. An honest, loyal, brave and moral man, there is no doubt that Hamlet is a hero. I’d trust him to rule my country any time! A hero is defined in the oxford English dictionary as â€Å"a man, often of divine ancestry, who is endowed with great courage and strength, celebrated for his bold exploits. † You can’t deny it’s the perfect description of Hamlet!