Electric Discharge Machining

ELECTRIC DISCHARGE MACHINING INTRODUCTION * Sometimes it is referred to as spark machining, * Its a manufacturing process whereby a desired shape is obtained using electrical discharges (sparks). * Material is removed from the workpiece by a series of rapidly recurring current discharges between two electrodes, separated by a dielectric liquid and subject to an electric voltage. * One of the electrodes – ‘tool-electrode’ or ‘tool’ or ‘electrode’. * Other electrode – workpiece-electrode or ‘workpiece’. As distance between the two electrodes is reduced, the current intensity becomes greater than the strength of the dielectric (at least in some points) causing it to break. * EDM is a machining method primarily used for hard metals or those that would be very difficult to machine with traditional techniques. * EDM typically works with materials that are electrically conductive, although methods for machining insulating cer amics with EDM have been proposed. * EDM can cut intricate contours or cavities in hardened steel without the need for heat treatment to soften and re-harden them. This method can be used with any other metal or metal alloy such as titanium, hastelloy, kovar, and inconel. EDM – Working Principle * It is a process of metal removal based on the principle of material removal by an interrupted electric spark discharge between the electrode tool and the work piece. * In EDM, a potential difference is applied between the tool and workpiece. * Essential – Both tool and work material are to be conductors. * The tool and work material are immersed in a dielectric medium. * Generally kerosene or deionised water is used as the dielectric medium. A gap is maintained between the tool and the workpiece. * Depending upon the applied potential difference (50 to 450 V) and the gap between the tool and workpiece, an electric field would be established. * Generally the tool is connected to the negative terminal (cathode) of the generator and the workpiece is connected to positive terminal (anode). * The high speed electrons then impinge on the job and ions on the tool. * The kinetic energy of the electrons and ions on impact with the surface of the job and tool respectively would be converted into thermal energy or heat flux. Such intense localized heat flux leads to extreme instantaneous confined rise in temperature which would be in excess of 10,000oC. * Such localized extreme rise in temperature leads to material removal. * Material removal occurs due to instant vaporization of the material as well as due to melting. * The molten metal is not removed completely but only partially. EDM – Dielectric * In EDM, material removal mainly occurs due to thermal evaporation and melting. * As thermal processing is required to be carried out in absence of oxygen so that the process can be controlled and oxidation avoided. Oxidation often leads to poor surface conduct ivity (electrical) of the workpiece hindering further machining. * Hence, dielectric fluid should provide an oxygen free machining environment. * Further it should have enough strong dielectric resistance so that it does not breakdown electrically too easily. * But at the same time, it should ionize when electrons collide with its molecule. * Moreover, during sparking it should be thermally resistant as well. * Generally kerosene and deionised water is used as dielectric fluid in EDM. Electric Discharge Machining ELECTRIC DISCHARGE MACHINING INTRODUCTION * Sometimes it is referred to as spark machining, * Its a manufacturing process whereby a desired shape is obtained using electrical discharges (sparks). * Material is removed from the workpiece by a series of rapidly recurring current discharges between two electrodes, separated by a dielectric liquid and subject to an electric voltage. * One of the electrodes – ‘tool-electrode’ or ‘tool’ or ‘electrode’. * Other electrode – workpiece-electrode or ‘workpiece’. As distance between the two electrodes is reduced, the current intensity becomes greater than the strength of the dielectric (at least in some points) causing it to break. * EDM is a machining method primarily used for hard metals or those that would be very difficult to machine with traditional techniques. * EDM typically works with materials that are electrically conductive, although methods for machining insulating cer amics with EDM have been proposed. * EDM can cut intricate contours or cavities in hardened steel without the need for heat treatment to soften and re-harden them. This method can be used with any other metal or metal alloy such as titanium, hastelloy, kovar, and inconel. EDM – Working Principle * It is a process of metal removal based on the principle of material removal by an interrupted electric spark discharge between the electrode tool and the work piece. * In EDM, a potential difference is applied between the tool and workpiece. * Essential – Both tool and work material are to be conductors. * The tool and work material are immersed in a dielectric medium. * Generally kerosene or deionised water is used as the dielectric medium. A gap is maintained between the tool and the workpiece. * Depending upon the applied potential difference (50 to 450 V) and the gap between the tool and workpiece, an electric field would be established. * Generally the tool is connected to the negative terminal (cathode) of the generator and the workpiece is connected to positive terminal (anode). * The high speed electrons then impinge on the job and ions on the tool. * The kinetic energy of the electrons and ions on impact with the surface of the job and tool respectively would be converted into thermal energy or heat flux. Such intense localized heat flux leads to extreme instantaneous confined rise in temperature which would be in excess of 10,000oC. * Such localized extreme rise in temperature leads to material removal. * Material removal occurs due to instant vaporization of the material as well as due to melting. * The molten metal is not removed completely but only partially. EDM – Dielectric * In EDM, material removal mainly occurs due to thermal evaporation and melting. * As thermal processing is required to be carried out in absence of oxygen so that the process can be controlled and oxidation avoided. Oxidation often leads to poor surface conduct ivity (electrical) of the workpiece hindering further machining. * Hence, dielectric fluid should provide an oxygen free machining environment. * Further it should have enough strong dielectric resistance so that it does not breakdown electrically too easily. * But at the same time, it should ionize when electrons collide with its molecule. * Moreover, during sparking it should be thermally resistant as well. * Generally kerosene and deionised water is used as dielectric fluid in EDM.

Comparison of the flood and the survey

â€Å"Mankind often underestimates the power of nature† Compare ‘The Flood' and ‘A Survey in the light of this statement ‘A survey and ‘The Flood' are two poems which both use linguistic, rhythmic, structural and vocal tools to label the power of pure nature. They differ in many ways yet both, when delved into and studied, appear to agree that mankind does misjudge nature's power. The titles themselves of these two poems indicate an underlying meaning.For example, ‘The Flood' highlights that the focus of this poem is something we might consider as fairly ordinary, but John Clare thinks it is in fact fascinating enough to write a lengthy oem about. ‘A Survey rather than ‘The Survey indicates that what happens in this poem happens again and again; a theme which continues throughout this poem. The voice is 3rd person and impersonal and the tone of it is very lyrical, suggesting to us a ‘campfire song feel, which again displays that this is something that happens repeatedly and continually.In contrast to this, ‘The Flood', instead of a tone of lyrical mythology, has a personal voice and tone of immediacy. The constant imagery provided makes the reader feel as if they were there, instead of Just being told an ‘old ives tale', like the mood of ‘A Survey. Interestingly, both poems contain a mix of past and present tense. This could suggest continuity in both, and the idea that nature, although both are describing a specific event in the past, is always present, and therefore is very powerful as it cannot be overcome. Each poem uses structure and punctuation very cleverly, but in different ways.For example, in â€Å"The Flood†, each line uses iambic pentameter and everything has a rhyme – everything has a word somewhere that rhymes with it. The verses are 14 lines, similar to a sonnet, and the ast verse is even a perfect sonnet that rhymes correctly and finishes with a rhyming couple t. Like a river, it seems chaotic and long, but it technically obeys rhythmic rules. This could suggest to us that everything in nature has a purpose, and nature has its own balance, Just like the theme of ‘A Survey. This could be seen to agree with the statement as the sheer power of nature really comes through here.Contrariwise, Stafford uses rhyme differently. In every verse there is half and imperfect rhyme, but in the verse that talks about the field boot crew – the epresentation of mankind interference'- there is one perfect rhyme; â€Å"crew' and â€Å"two†. This proposes the notion that the â€Å"field boot crew' have tried to force a perfect rhyme upon nature, but it quickly disintegrates into the fact that nature's own natural rhythm, represented by the constant rhythm, works by itself and doesn't need man's interference as it is powerful enough itself.Each stanza in ‘A Survey fascinatingly ends with a full stop, not keeping in the theme of cont inuity the poem has so far displayed. This could be because Stafford wanted to keep within the lyrical form of he poem. Differently, ‘The Flood' incorporates hardly any punctuation save some dashes and a full stop at the end. This again indicates an idea that nature will never end or be stopped, and is more powerful than man. The language is very different in the two poems. One is extravagant and descriptive whereas the other is, although narrative too, less vivid.However, one thing very prominent in ‘A Survey is the contrasts and Juxtaposition used. In the first verse even, Juxtaposition is very obviously used; â€Å"crammed witn hysterical water† tollowed by â€Å"hushed by placid sands†. Another example is the description of the wildcats- or the agents of nature- balancing out the wildness of the land; on one hand the animals are described with â€Å"intricate lines of fur†, â€Å"finesse† and â€Å"tentative paw[s]†, then the sun an d mountains are said to â€Å"rake[s]†¦ buck and scream† and the ridges are described to have â€Å"hackles†.This image of balance follows the theme of the rest of the poem. Contrast is used in a different way in ‘The Flood', perhaps to indicate a dissimilar meaning. The start and end of ‘The Flood' is very chaotic; verbs like â€Å"dashing†¦ ]arred†¦ plunging†¦ oars† are used to imitate the feel of a rushing river. However, the middle verse has a completely different atmosphere due to the language used. â€Å"The feather dances flutters† and â€Å"danced it o'er the waves† bring a different picture of calm.This could represent those small areas of calm sometimes found in bedlam. On the other hand ‘The Flood' can be seen as similar to ‘A Survey because it also highlights the sense of nature's own balance. Personification is used incredibly effectively, especially in the last verse, â€Å"other monsters r ise† is particularly effective as it is strong magery, and describing the flood itself as â€Å"restless†, a human emotion. This puts across the idea that nature has a life of its own like everybody else. Personification is also used to the same effect in â€Å"A Survey'.

Arctic Exploration and the Future of the Arctic Ocean Essay

Arctic Exploration and the Future of the Arctic Ocean - Essay Example This would help him sail through with the boat he brought (Berton 2012). For years, many nations such as the U.S, Canada, Norway, Russia, and Denmark have interest in the riches and the potentials of the Arctic Ocean. Some of these nations have parts of the Arctic Ocean as their territory because the area has vast oil deposits and lucrative business activities like trade routes. These opportunities have made the nations to vie for arctic dominance thus causing disputes between these countries (Shah, 2010). Using compass for direction in the arctic can be useless because of magnetic inclination. This is the difference between the geographic north and magnetic north poles. The North Pole is all one side of a magnet so when you have a compass, it will be repelled and attracted at the same time. The compass will end up pointing towards a random position. This will be challenging for anyone trying to find his or her way through because the compass will identify north as a different

Enforcement of International Law Annotated Bibliography

Enforcement of International Law - Annotated Bibliography Example This is in accord with the power of these judicial bodies to fully enforce the law and impose sanctions among the members States which do not comply faithfully comply with their obligations, such as those contained in the treaty stipulations and multilateral agreements. The modern armed conflicts being faced by these law-enforcement bodies, together with the causes and prevention of conflict among states, conflict resolution and team building are given emphasis to ensure that international laws are strictly implemented. Barker, J. C. (2004). Mechanisms to Create and Support Conventions, Treaties and Other Responses. The Enforcement of International Law. Retrieved on, April 12, 2011, from This online website contains a system of collective enforcement that was designed to ensure that the member States do not need to resort to power and force to implement the laws, except in cases of extreme circumstances of self-defense. The collective enforcement system envisages the role of the UN Security Council in the maintenance of international peace and security within the international community. International Law Enforcement Law Reporter. Retrieved on, April 12, 2011, from, . This website is a source of identified and predicted trends in the legislative, administrative, and the case law development dealing with the enforcement of international law. Meaningful discussions are annotated to enable practitioners, policy makers and academics to the website are given reference tools and guidelines to the practice of international law enforcement. It contains information on international organizations and developments in international enforcement law that have not reached the treaty or case law level, such as executive decisions in training and appropriations. Kalshoven, Frits. (2007). Reflections on the War: Collected Essays. The Netherlands. Martinus Nijhoff Publishers. This book focuses on the importance of the will of the States in determining whether existing international obligations will be respected in the development and acceptance of new customary or conventional rules of international law, which involves the interest of the member States. The process of decision making of States in question should result in the respect of international obligations and good faith on the part of the decision makers of the international community should work for the common good. Kelsen, H. (2003). Principles of International Law. New Jersey, USA: The LawBook Exchange, Inc. This book presents the international mechanisms which have assisted in the enforcement of international law, such as the power conferred upon each state of taking certain enforcement rights, which have the character of reprisals of limited interference in the sphere of interests of another state , in case certain interests of the former are violated by the latter. It presents that the States also exercise rights of enforcement of State sovereignty where in the interest of the state are threatened by aggression which results in the exercise of self-defense. Thus, international law makes these violations fall under international delicts which have corresponding penalties and sancti ons to serve as a preventive measures in resolving potential conflicts. Kelsen, Hans. (2000 ). The Law of the United Nations. A Critical Analysis of its Fundamental Problems. New Jersey, USA: The LawBook Exchange, Inc. This book is essential to this research as it provides a juristic approach to the problems of the United Nations, which deals with the law of the organization, not with

Scientology Term Paper Example | Topics and Well Written Essays - 1000 words

Scientology - Term Paper Example Scientology can be described as a valuable study that preserves its spiritual relationship to the principles of the universe and that of other creatures (Lewis 5-100). Thesis Statement The paper intends to briefly explore the concept of Scientology and understand its various aspects. The discussion of this paper highlights major characteristics and various facts about the religion of Scientology. Moreover, the discussion also considers the major principles of Scientology and its significance in the human life through its various controversial facts. Discussion The dimension of Scientology emanates from the ‘scientia’, a Latin word which signifies knowledge and skills of each individual. According to Hubbard, â€Å"[s]cientology is the science of knowing how to know the answers. It is an organized system of axioms and processes which resolve the problem of existence† (Hubbard 25). Therefore, it can be recognized that the religion of Scientology is prepared with reg ard to the spiritual viewpoint that encloses an appropriate and practical description of the spirit and is competent to develop the spiritual behaviors. L. Ronald Hubbard also mentioned that Scientology transformed in the tradition of thousands of years of religious philosophy that significantly is considered a result of the investigation upon various religions including Veda, Buddhism, The Tao, and Christianity among others. It is a Gnostic faith which is considered as an appropriate knowledge of knowing things. Scientology can reveal that it can achieve the objectives that are set for any individuals by all religions that include human insights, good health, and immortality (Hubbard 25). In order to recognize Scientology in more expressive way, the nature and the scope of Dianetics need to be significantly identified. Dianetics can be illustrated as the fundamental concept of scientific principles of human thoughts and beliefs and is significantly related to discover the power of knowledge which is possessed within the human mind (Hubbard 7). Scientology can also be regarded as an association which relies in between religion and psychology. The approach significantly focuses to each individual in terms of properly evaluating the power of knowledge that releases full potential of an individual. The appropriate utilization of ideas or knowledge considerably provides the benefit to each individual to empower innate superhuman nature. According to the philosophical principles of Scientology, major challenges of each individual that affect in achieving desired goals include lack of confidence, physical or psychological disabilities, and psychosomatic infirmities. Elimination of such human limitations is quite essential for any individual in order to successfully achieve desired goals and objectives (Wallis, â€Å"The Road to Total Freedom: A Sociological Analysis of Scientology†). Major Aspects of Scientology Scientology involves two major principles that are described in its ARC and KRC triangles. ARC and KRC triangles of Scientology significantly describe the relationship between its three major concepts. The ARC triangle within the periphery of Scientology is a major aspect that significantly possesses the principles and values of Scientology, including power of knowledge and skills of individuals (Neusner 228). ARC Triangle The ARC triangle consists of three major aspects: Affinity, Reality and Communication. Affinity in

Research Integration Essay Example | Topics and Well Written Essays - 1000 words

Research Integration - Essay Example The volume of data and evidence that was synthesized to come up with the guidelines is quite many which make it quite proper and important to nursing practice. Moreover, many experts were involved in developing this practice guideline such as microbiologists who play crucial roles in the treatment of AOM. To make the article more acceptable is the use of simple language that is easy to understand by all healthcare specialists. It highly recommends the concept of watchful waiting as the best option in handling AOM complications. Block, S. L. (1997). Causative Pathogens, Antibiotic Resistance And Therapeutic Considerations in Acute Otitis Media. Pediatric Infectious Disease Journal, 16, 449–456. This source can be classified as a filtered information article owing to its approach to the handling of AOM. In essence, it reviews and gives a summary of proceedings in a symposium that discussed pertinent issues that are related to increased antibiotic resistance to AOM. In terms of t he kind of evidence, it falls under evidence summary because it delineates different recommendations of handling cases of AOM. Owing to the large volume of evidence surmised in this article, it is quite appropriate and suited for nursing practice. Moreover, it tackles different cases of AOM which may be caused by different pathogens in synergy which makes some AOM cases complicated. In such scenarios, the article is of the opinion that treatment and administration of antibiotics should only be started after the causative pathogens have been positively identified. This in turn ensures that cases of antibiotic resistance are reduced because some antibiotics are not effective in handling some causative pathogens of AOM. Kelley, P. E., Friedman, N., Johnson, C. (2007). Ear, nose, and throat. In W. W. Hay, M. J. Levin, J. M. Sondheimer, & R. R. Deterding (Eds.), Current Pediatric Diagnosis And Treatment (18th ed., pp. 459–492). New York: Lange Medical Books/McGraw-Hill. This is a filtered source because it gives an in depth analysis of different microbial infections that infect around the throat region. It has been noted that the different infections that occur within this region and affect the eyes, nose throat are caused by common or similar pathogens. It follows then that chances are high that infection in any of the parts will automatically lead infection of the other parts. This article can also be classified as evidence based guideline that tables diagnostic procedures as well as the treatment of AOM infections. The suitability of the source for nursing practice is found in the in depth analysis of different methods of handling cases of AOM. In addition, the article provides a chart or diagrammatic representation on how to handle this infection at each step of its progress. McCracken, G. H. (1998). Treatment of Acute Otitis Media In An Era Of Increasing Microbial Resistance. Pediatric Infectious Disease Journal, 17, 576–579. Information is synth esized and analyzed about the rising resistance of pathogens that causes antibiotics to. Moreover, a guideline is also provided that gives the way forward on how to handle these complications and as such the source is a filtered source. In terms of evidence, it can be classified as

Assess Kant's Ethics Of Duty And Freedom As A Response To All Previous Essay

Assess Kant's Ethics Of Duty And Freedom As A Response To All Previous Ethical Theories - Essay Example According to the Kantian ethics, people have the duty to act in certain ways even if it does not produce the best results. â€Å"The ethics of duty is rooted in Immanuel Kant's categorical imperative ‘Act only on that maxim by which you can at the same time will that it should become a universal law,’ which in turn is rooted in the belief that humans are rational beings capable of self-determination and self-governance. Every responsible person is therefore entitled to dignity and respect.† Thus, the views of Kant, who is the most important supporter in history of deontological ethics or the study of duty, insist that the single feature that gives an action moral value is the motive that is behind the action. Similarly, another central concept in Kant’s ethics is freedom which is an idea of reason that serves a crucial practical purpose. â€Å"Without the assumption of freedom, reason cannot act. If we think of ourselves as completely causally determined, and not as uncaused causes ourselves, then any attempt to conceive of a rule that prescribes the means by which some end can be achieved is pointless.†" (McCormick, 2006) In short, the concepts of freedom and duty are central to the Kantian ethics and the originality and uniqueness of Kant's ethical theory is that he celebrated a general criticism of previous ethical theories. To comprehend the originality and uniqueness of Kant's ethical theory, it is essential to realize that he is a tough critic of previous ethical theories, especially the theory of utilitarianism. He is undisputed master of ethical theory and he finds good will as the only good thing in the world. He goes on to associate the concept of good will with actions from duty which have the only true moral value in life. Therefore, Kant associates "good will in some way with acting from duty and claims that only actions done from duty have true moral worth or moral content, while actions in conformity to duty that are done from self-interest, or even beneficent actions done from a natural inclination such as spontaneous sympathetic pleasure agents take in seeing those around them happy, are lacking in authentic moral worth or moral content." (Wood, 2007, p 24). To Kant, only those actions which spring from duty can display a good will and his ethical theories are original which question the va lidity of earlier thoughts. Significantly, the originality and uniqueness of Kant's ethical theory is clear from his 'Copernican revolution' which includes freedom, autonomy and heteronomy. An understanding of how Kant distinguishes between autonomy and heteronomy helps one in realizing the uniqueness of Kant's ethical theory. "For Kant the term "autonomy" denoted our ability and responsibility to know what morality requires of us and to act accordingly. In a derivative sense, the autonomous person is one who exercises this ability and lives up to this responsibility There are also