Defining Religion Essay - 2695 Words

Defining Religion Religion is only the illusory sun which revolves round man as long as he does not revolve round himself. Karl Marx. Before we can look at the Marxist theory of religion we must first have some understanding of what religion is. For many in todays world religion is becoming something alien, only 3% of the population of Britain attend Church! Religion is, however, much more than simple Church attendance, something that has never been high amongst the British working-class. Religion for me involves two things: beliefs and practices, or, rituals. Roland Robertson defines religion in the†¦show more content†¦How do you object? The only thing to do is not to go to the ritual. Imagine getting up in the middle of one of the Ministers prayers and stating your objections, you would either be ignored or thrown from the place of worship. Rituals are sacred, not to be interrupted or questioned. What Im concerned with here is less the ritual aspect of religion as the beliefs that form religions and the religious hierarchies that hold a measure of power, in some societies more than others, vis-à  -vis the State and civil society in general. What did Marx and Engels think of religion? Marx had as much time for religion as the religious had for Marxism. For Marx religion is an illusion, a creation of humanity. God did not create humanity: humanity creates its Gods. The phenomenon of religion is part of what Marx refers to as alienation. Alienation is a situation in which the creations of humanity appear alien, that is, we do not recognise our own hand in their creation and assign to them powers that only we ourselves possess or could possess if only we did not assign them to superhuman beings that do not exist. Marx was very much influenced by the work of philosopher Ludwig Feuerbach. According to Feuerbach God was merely a projection of humanitys attributes, desires and potentialities. Once menShow MoreRelatedDefining Religion1029 Words   |  5 PagesWhen searching for the meaning of the term religion one most go a long way in making an extensive search to actually form a definition that can fit such a broad word. There is no one definition that can satisfy all religions and remain true to all religions throughout its answer. There are many different views and definitions of the word and it is very hard to come up with a reasonable definition that sums such a massive expression up. Religion when used as a single word is almost impossible to defineRead MoreDefining Religion Essay1687 Words   |  7 PagesDefining Religion The most fundamental question when examining a religion is what is religion? That is a distinctly hard question to answer considering that what is ordinarily considered to be religion is not all it is, and what many consider not to be religion may be near religious (i.e. sports). The truth is that there are no genuine answers to the question of what is religion. Definitions of religion tend to suffer from one of two problems: they are eitherRead MoreEssay on Religion in a Multicultural World1291 Words   |  6 PagesReligion In a multicultural world where language, traditions and culture differ from country to country there is one thing that may be deemed to be true and this is that religion is the centre point for most of them. So then what exactly is religion? And how can you define it? In this paper I will be analysing and considering the different definitions that have been proposed by Victoria S. Harrison in her article â€Å"The pragmatics of defining religion in a multi-cultural world† and what I considerRead MoreThe Impossibility Of Religious Freedom1713 Words   |  7 PagesThe act of defining religion has been a contentious issue in a wide variety of situations, particularly in the United States. The US is a nation that prides itself on religious inclusivity and freedom. There are consequences to this belief and tenant. Through the social, legal and moral structures of the United States, defining religion has become imperative. In The Impossibility of Religious Freedom, Winifred Sulliv an outlines the legal implications of defining religion in the United States. InRead MoreWhat Is Religion? Essay1614 Words   |  7 PagesWhat is religion? Each person’s definition of religion is different. Each person’s faith is different. This is a question that has been asked for centuries, and regardless of the answer given there is no right or wrong answer. Religion can be defined as a group of people who have shared beliefs who feel their life has purpose or meaning. This feeling or belief that their life has meaning can come from outside of themselves, as well as within. Taking this one step further, these shared beliefsRead MoreThe Interpretation Of Cultures By Clifford Geertz1713 Words   |  7 Pagesdefinition of religion, which has been subjected to much admiration and scrutiny. In this essay, I will be discussing some of Geertz’s terminology, cockfighting’s relationship with religion, Asad’s enlightening critique, and webs of significance. For starters, I will say that I actually read another one of Geertz’s pieces, Islam Observed, a year ago, and while I liked some of his ideas, I interpreted his tone and word choices at times as a tad bit condescending. I found â€Å"Religion as a CulturalRead MoreDefining Abnormality1408 Words   |  6 PagesDefining Abnormality Paper Sabrina Koppen University Of Phoenix Robert Irizarry PSY 410 Abnormal Psychology August 11, 2008 Defining Abnormality Paper As William is walking down the street he notices a young woman walking toward him having a full conversation. Technology, Bill thought to himself, thinking that the young woman has one of those blue tooth ear pieces in her ear. Once Bill is close enough to get a clear view he realizes that the young woman is not on the phone but indeedRead MorePride, Religion, Heritage, And Success Essay710 Words   |  3 Pagespositivity and negativity. In defining the meaning of pride, one will perceive that it correlates with three prominent areas of the human life: religion, heritage, and success. Pride is a characteristic of the human nature that results from feelings of respect toward certain aspects of one’s life. First, an area of life in which humans encounter the emotional feeling of pride is in their practice of religion. An ideal example of humans displaying pride in their religion is the Muslim community. SomeRead MoreMeaning and End of Religion Essay934 Words   |  4 Pages September 17, 2011 Intro to Phil of Religion Professor Skorobogatov-Gray Banner ID: 800494043 The Meaning and End Of Religion Wilfred Cantwell Smith In the article, The Meaning and End of Religion, by Wilfred Cantwell Smith writes about his idea of the concept of religion explaining it to be a universally valid category as it is theorized but is truly a European creation. Throughout the article Smith conveys his ideas of religion. In his piece, there are several interestingRead MoreThe Social Vs. The Individual946 Words   |  4 PagesThe Social vs. The Individual The concept of religion is a vastly complex and broad idea that many social theorists have tried to define over the course of history. Emile Durkheim and William James are two main theorists whose research has had a significant effect on how religion is viewed by many today. Although Durkheim and James are on different sides of the spectrum when it comes to their explanations of the role of religion in society and in the individual, there are also many similarities

If only God had made Adam Steve, instead of Adam Eve Free Essays

In â€Å"Let Gays Marry,† Andrew Sullivan responds to conservative objections to same-sex marriages, by arguing that allowing such unions would actually promote traditional values, such as fidelity, monogamy, and love. It should logically appeal to straight conservatives, who deplore gay male promiscuity, that the declaration of Supreme Court: â€Å"A state cannot deem a class of persons a stranger to its laws,† now assigns equal rights to gays and lesbians. Andrew Sullivan is a senior editor at The New Republic, a magazine he edited from 1991 to 1996, and the U. We will write a custom essay sample on If only God had made Adam Steve, instead of Adam Eve or any similar topic only for you Order Now S. columnist for the Sunday Times of London. He has a B. A. in modern history and modern languages from Oxford University and a Ph. D. in political science from Harvard University. He lives in Washington, D. C. The real problem is that there are really only three arguments against gay marriage: One is rooted in entirely God’s preferences, the second cites inconclusive research on its negative effects on children, and third, the integrity of a marriage as a legal document. Sullivan effectively presents his case in a very logical fashion, calmly displaying his points, and using a statement declared by the United States Supreme Court, under which no gay men or lesbians will be considered strangers in America. They (Gays) are human beings just like you and I, â€Å"the sons and daughters of countless mothers and 2 fathers,† and should have the same opportunities to pursue happiness by marrying the one that they love. A natural process, where two people fall in love and decide to get married, is not any different for gay people. Therefore legalizing gay marriages does not provide gays with any special rights or place in America, but instead people will consider them to be an equal part of the society. The main idea is homosexuals should have the right to get married legally. Sullivan does not want churches to make any change in their practice, but to allow everyone to be who he/she is, a principle that the United States was created on. Plus, the concept of marriage has changed within the past one hundred years. The inter-caste and the inter-religion marriages which were once prohibited or forbidden between couples, has now become socially acceptable. Gay marriages do not change anyone else’s rights or marriages in any way. Marriage is not just about raising children because the fact that many notable â€Å"childless heterosexual couples† exist in today’s society, such as Bob Dole and his wife Elizabeth Dole, etc. Sullivan concludes by telling the general public to accept homosexual marriages and the fact that they will not be the turning point for the downfall of all society. Although I agree with Sullivan when he says, legalizing gay unions would not change anyone’s right to marriage, I find Bennett’s view more powerful, that it would weaken the institution of marriage, and contradict natural, moral, religious, and sexual realities. After reading Sullivan’s article, I question his credibility, as he didn’t provide enough evidence to get his point through. His approach toward his readers is with a lot of pathos, rather than logos. For example, when he states â€Å"And what we 3 seek is not a special place in America†¦ o give back to our society,† it is not clear as to what he means by giving back. When he argues about the definition of marriage, Sullivan fails to see the change, which was brought about for the welfare of the people (inter-caste marriages, inter-religion marriages, etc. ), consisted of a â€Å"man† and a â€Å"woman†, not two men, or two women. I would have agreed to the assertion, â€Å"the most simple, the most natural, and the most human instinct,† if it was used to prove the relationship between a male and a female. But using it to persuade about the same sex marriage doesn’t cheer me up. To answer the question of whether gay and lesbian couples should have the right to marry, the question of why the institution of marriage is valued so dearly in society today must be answered. To do this, the meaning of the word marriage must be found, remembering that there are different levels in which marriage can be interpreted and/or evaluated. As with many other issues, when one tries to define the word marriage and its repercussions in society, several fundamental questions arise that must be answered in order to get a better understanding of the issue in question. Questions like: What is marriage defined as? In Webster’s Dictionary, marriage is defined as â€Å"The institution whereby men and women are joined in special kind of social and legal dependence for the purpose of founding and maintaining a family. † This concept seems to have been perpetuated throughout history, one man and one woman joined â€Å"till death do them part. † Keeping the above points in view, same sex marriages defy the laws of Christianity, and it is immoral in the eyes of society. Homosexuality in almost all countries has been looked down upon, and sometimes condemned. This opposition stems from the Holy 4 Bible. The couple in the Garden of Eden was a man and a woman, not two men or two women. If God intended two men or two women to be together, he would have put them in the Garden of Eden, giving them both the ability to have children. But that didn’t happen. God created Adam and Eve, not Adam and Steve, for the procreation of life. God wanted man and woman to reproduce with one another in order for the human race to continue. Today, adoption has taken a turn for the worse; Gay and Lesbian couples who cannot have their own children are adopting kids. I see this as one of the concerned problems. What kind of message are these kids getting? That homosexuality is all right. Moreover, the impact of this move can be devastating on the children as they grow up. For example, they might have to face a lot of challenges, like people taunting them, name calling, making fun, etc. Homosexuality is rejected by all major religions around the globe, but Andrew Sullivan still believes that promiscuity in homosexual relationships can show heterosexual couples that adultery doesn’t have to end their marriage. The Bible states, â€Å"Leviticus 20:13: If a man lies with a male as he lies with a woman, both of them have committed an abomination. They shall surely be put to death. † Thus, a 4000 year old book had an answer to the question being asked today. i. e. = Same Sex Marriage– Ethical or Unethical? How to cite If only God had made Adam Steve, instead of Adam Eve, Papers

Minimum Quantity Lubrication Essay Example

Minimum Quantity Lubrication Essay ABSTRACT Metal cutting fluids changes the performance of machining operations because of their lubrication, cooling, and chip flushing functions. Typically, in the machining of hardened steel materials, no cutting fluid is applied in the interest of low cutting forces and low environmental impacts. Minimum quantity lubrication (MQL) presents itself as a viable alternative for hard machining with respect to tool wear, heat dissertation, and machined surface quality. This study compares the mechanical performance of minimum quantity lubrication to completely dry lubrication for the turning of hardened bearing-grade steel materials based on experimental measurement of cutting forces, tool temperature, white layer depth, and part finish. The results indicate that the use of minimum quantity lubrication leads to reduced surface roughness delayed tool flank wear, and lower cutting temperature, while also having a minimal effect on the cutting forces. Minimum quantity lubrication. doc (Size: 2. 7 MB / Downloads: 63) password:seminarprojects CHAPTER I INTRODUCTION The growing demand for higher productivity, product quality and overall economy in manufacturing by machining and grinding, particularly to meet the challenges thrown by liberalization and global cost competitiveness, insists high material removal rate and high stability and long life of the cutting tools. But high production machining and grinding with high cutting velocity, feed and depth o f cut are inherently associated with generation of large amount of heat and high cutting temperature. We will write a custom essay sample on Minimum Quantity Lubrication specifically for you for only $16.38 $13.9/page Order now We will write a custom essay sample on Minimum Quantity Lubrication specifically for you FOR ONLY $16.38 $13.9/page Hire Writer We will write a custom essay sample on Minimum Quantity Lubrication specifically for you FOR ONLY $16.38 $13.9/page Hire Writer Such high cutting temperature not only reduces dimensional accuracy and tool life but also impairs the surface integrity of the product. In high speed machining conventional cutting fluid application fails to penetrate the chip–tool interface and thus cannot remove heat effectively. Addition of extreme pressure additives in the cutting fluids does not ensure penetration of coolant at the chip–tool interface to provide lubrication and cooling . However ,high-pressure jet of soluble oil, when applied at the chip–tool interface, could reduce cutting temperature and improve tool life to some extent . However, the advantages caused by the cutting fluids have been questioned lately, due to the several negative effectsthey cause. When inappropriately handled, cutting fluids may damage soil and water resources, causing serious loss to the environment. Therefore, the handling and disposal of cutting fluids must obey rigid rules of environmental protection. On the shop floor, the machine operators may be affected by thebad effects of cutting fluids, such as by skin and breathing problems For the companies, the costs related to cutting fluids represent a large amount of the total machining costs. Several research workers state that the costs related to cutting fluids are frequently higher than those related to cutting tools. Consequently, elimination on the use of cutting fluids, if possible, can be a significant economic incentive. Considering the high cost associated with the use of cutting fluids and projected escalating costs when the stricter environmental laws are enforced, the choice seems obvious. Because of them some alternatives has been sought to minimize or even avoid the use of cutting fluid in machining operations. Some of these alternatives are dry machining and machining with minimum quantity lubrication (MQL). Dry machining is now of great interest and actually, they meet with success in the field of environmentally friendly manufacturing . In reality, however, they are sometimes less effective when higher machining efficiency, better surface finish quality and severe cutting conditions are required. For these situations, semi-dry operations utilizing very small amount of cutting fluids are expected to become a powerful tool and, in fact, they already play a significant role in a number of practical applications . inimum quantity lubrication (MQL) refers to the use of cutting fluids of only a minute amount—typically of a flow rate of 50–500 ml/h which is about three to four orders of magnitude lower than the amount commonly used in flood cooling condition. The concept of minimum quantity lubrication, sometimes referred to as near dry lubrication or micro-lubrication , has been suggested since a decade ago as a mean of addressing the issues of environmental intrusiveness and occupational hazards associated with the airborne cutting fluid particles on factory shop floors. The minimization of cutting fluid also leads to economical benefits by way of saving lubricant costs and work piece/tool/machine cleaning cycle time. Significant progress has been made in dry and semidry machining recently, and minimum quantity lubrication(MQL) machining in particular has been accepted as a successful semi-dry application because of its environmentally friendly characteristics. Some good results have been obtained with this technique . Lugscheider et al. sed this technique in reaming process of gray cast iron and aluminum alloy with coated carbide tools and concluded that it caused a reduction of tool wear when compared with the completely dry process and, consequently, an improvement in the surface quality of the holes. The drilling of aluminum–silicon alloys is one of those processes where dry cutting is impossible due to the high ductility of the work piece material. Without cooling and lubrication, the chip sticks to the tool and breaks it in a very short cutting time. There fore, in this process a good alternative is the use of the MQL technique The present work experimentally investigates the role of minimum quantity lubrication on cutting temperature, chip reduction coefficient and dimensional deviation in plain turning of AISI-1040 steel at different speed-feed combinations by uncoated carbide insert and compares the effectiveness of MQL with that of dry machining and conventional cutting fluid. CHAPTER 2 EXPERIMENTAL CONDITIONS AND PROCEDURE For the present experimental studies, AISI-1040 steel rod of initial diameter 110mm and length 620mm was plain turned in a BMTF Lathe, Bangladesh, 4 hp by uncoated carbide insert of integrated chip breaker geometry at different speed-feed combinations under dry, wet and minimum quantity lubrication (MQL) conditions to study the role of MQL on the machinability characteristics of that work material mainly in respect of cutting temperature, chip reduction coefficient and dimensional deviation. The experimental conditions are given in Table 1. Machine tool BMTF Lathe, Bangladesh, 4 hp Work piece AISI-1040 steel (size: O110mm? 620 mm) Cutting tool (insert) Cutting insert Carbide, SNMM 120408 (P-30 ISOspecification), Drillco Tool holder PSBNR 2525M12(ISO specification), Working tool geometry ? 6? , ? 6? , 6? , 6? , 15? , 75? , 0. 8 (mm) Cutting velocity, Vc 64, 80, 110 and 130 m/min Feed rate, So 0. 10, 0. 13, 0. 16 and 0. 20 mm/rev Depth of cut, t 1. 0mm MQL supply: Air 7 bar, Lubricant: 60 ml/h (throughexternal nozzle) Environment: Dry, wet (flood cooling) and minimum quantity lubrication (MQL) Table2. 1 Experimental conditions The ranges of the cutting velocity (Vc) and feed rate (So) were selected based on the tool manufacturer’s recommendation and industrial practices. The depth of cut was kept constant since it has much less significant role on the machining characteristics excepting the magnitude of the cutting forces, which simply increase proportionally with the increase in depth of cut. The MQL needs to be supply at high pressure and impinged at high speed through the nozzle at the cutting zone. Considering the conditions required for the present work and uninterrupted supply of MQL at constant pressure over a reasonably long cut, a MQL delivery system has been designed, fabricated and used. The schematic view of the MQL set up is shown in Fig. 1. The thin but high velocity stream of MQL was projected along the auxiliary cutting edge of the insert, as indicated in a frame within Fig. 1, so that the coolant reaches as close to the chip–tool and the work–tool interfaces as possible . The photographic view of the experimental set-up is Figure 2. 1 Experimental setup Figure2. 1Block diagram of MQL The MQL jet has been used mainly to target the rake and flank surface along the auxiliary cutting edge and to protect the auxiliary flank to enable better dimensional accuracy . MQL is expected to provide some favorable effects mainly through reduction in cutting temperature. The simple but reliable tool–work thermocouple technique has been employed to measure the average cutting temperature during turning at different Vc–So combinations by the uncoated carbide insert under dry, wet and MQL conditions. For the present investigation, the calibration of the tool–work thermocouple has been carried out by external flame heating. The tool–work thermocouple junction was constructed using a long continuous chip of the concerned work material and a tungsten carbide insert to be used in actual cutting. To avoid generation of parasitic emf, a long carbide rod was used to extend the insert. A standard K-type thermocouple is mounted at the site of tool–work junction. The oxy-acetylenetorch simulated the heat generation phenomena in machining and raised the temperature at the chip–tool interface. Standard thermocouple directly monitored the junction temperature when a digital multimeter monitored the emf generated by the hot junction of the chip–tool. The effect of MQL on average chip–tool interface temperature at different Vc and So under dry, wet and MQL conditions is shown in Fig. 3. The chip samples collected while turning the steel by the insert of configuration SNMM at different Vc–So combinations under dry, wet and MQL condition have been visually examined and categorized with respect to their shape and color. The result of such categorization of the chips produced at different conditions and environments by the AISI-1040 steel. The actual forms of the chips produced during machining the steel with a cutting velocity 110 m/min and feed 0. 6 mm/rev under dry, wet and MQL conditions is shown in Fig. 4. Another important machinability index is chip reduction coefficient, ? (ratio of chip thickness after and before cut). For given tool geometry and cutting conditions, the value of ? depends upon the nature of chip–tool interaction, chip contact length and chip form all of which are expected to be influenced by MQL in addition to the levels of Vc and So. The variation in value of ? with Vc and So as well as machining environment evaluated for AISI-1040 steel have been plotted and shown in Fig. 5. The deviations in the job diameter before and after cuts were measured by a precision dial gauge with a least count of 1_m, which was traveled parallel to the axis of the job . MQL provided remarkable benefit in respect of controlling the increase in diameter of the finished job with machining time as can be seen in Fig. 6. Fig. 3. Variations in average chip–tool interface temperature with cutting velocity and feed rate during turning under dry, wet and MQL conditions CHAPTER 3 EXPERIMENTAL RESULTS AND DISCUSSION During machining any ductile materials, heat is generated at the primary eformation zone, secondary deformation zone and the flank (clearance) surfaces, but the temperature becomes maximum at the chip–tool interface. The cutting temperature measured in the present work r efers mainly to the average chip–tool interface temperature. Any cutting fluid applied conventionally cannot reduce this chip–tool interface temperature effectively because the fluid can hardly penetrate into that the interface where the chip–tool contact is mostly plastic in nature particularly at higher cutting velocity and feed. However, MQL jet could have reduced the cutting temperature quite significantly though in different degrees for different cutting velocity and feed combinations as can be seen in Fig. 3. The presence of the grooves along the cutting edges and the hills on the tool rake surface and reduced chip–tool contact length may have helped the MQL jet to come closer to the chip–tool interface and thus effectively cool that interface. The difference in the effectiveness of MQL observed under different Vc and So can be reasonably attributed to variation in the nature and extent of chip–tool contact with the changes in Vc and So. The pattern of chips in machining ductile metals generally depend upon the mechanical properties of the work material, tool geometry particularly rake angle, levels of Vc and So, nature of chip–tool interaction and the cutting environment . In absence of chip breaker, length and uniformity of chips increase with the increase in ductility and softness of the work material, tool rake angle and cutting velocity unless thechip–tool interaction is adverse causing intensive friction and built-up edge formation. Table 3. Shape and co lour of chips at different vc and so condition It shows that the steel when machined under dry and wet conditions produced spiral type chips and the color of the chips become blue. The geometry of the insert is such that the chips first came out continuously got curled along normal plane and then hitting at the principal flank of the insert broke into pieces with regular size and shape. When machined under MQL the form of these ductile chips chang e appreciably into more or less half turn and their back surface appeared much brighter and smoother. This indicates hat the amount of reduction of temperature and presence of MQL enabled favorable chip–tool interaction and elimination of even trace of built-up edge formation. The color of the chips have also become much lighter, i. e. metallic from blue depending upon Vc and So due to reduction in cutting temperature by MQL. The actual forms of chips produced during turning at cutting velocity 110 m/min and feed 0. 16 mm/rev under dry, wet and MQL condition as can be seen in Fig. 4. Figure 3. 1 shape of chips at different condition Fig. 4. Actual forms of chips produced during turning at cutting velocity 110 m/min and feed 0. 6 mm/rev under (a) dry, (b) wet and  © MQL conditions. Almost all the parameters involved in machining have direct and indirect influence on the thickness of the chips during deformation. The degree of chip thickening which is assessed by chip reducti on coefficient, ? plays sizeable role on cutting forces and hence on cutting energy requirements and cutting temperature. Fig. 5 shows that MQL has reduced the value of ? particularly at lower values of Vc and So. Figure. 3. 2. Variation in chip reduction coefficient, ? , with cutting velocity and feed rate during turning under dry, wet and MQL conditions. By MQL application, ? s reasonably expected to decrease for reduction in friction at the chip–tool interface and reduction in deterioration of effective rake angle by built-up edge formation and wear of the cutting edge mainly due to reduction in cutting temperature . MQL provided remarkable benefit in respect of controlling the increase in diameter of the finished job with machining time as can be seen in Fig. 6. Figure. 3. 3. Dimensional deviations observed after one full pass under dry, wet and MQL conditions In straight turning, the finished job diameter generally deviates from its desired value with the progress of mac hining, i. e. long the job-length mainly for change in the effective depth of cut due to several reasons which include wear of the tool nose, over all compliance of the machine–fixture–tool–work (M–F–T–W) system and thermal expansion of the job during machining followed by cooling. Therefore, if the M–F–T–W system is rigid, variation in diameter would be governed mainly by the heat and cutting temperature . With the increase in temperature the rate of growth of auxiliary flank wear and thermal expansion of the job will increase. MQL takes away the major portion of heat and reduces the temperature yielding reduction in dimensional deviation desirably CHAPTER 4 CONCLUSIONS Based on the results of the present experimental investigation the following conclusions can be drawn: †¢ The cutting performance of MQL machining is better than that of conventional machining with flood cutting fluid supply. †¢ MQL provides the benefits mainly by reducing the cutting temperature, which improves the chip–tool interaction and maintains sharpness of the cutting edges. †¢ Due to MQL, the form and color of the steel chips became favorable for more effective cooling and improvements in nature of interaction at the chip–tool interface. Dimensional accuracy improved mainly due to reduction of wear and damage at the tool tip by the application of MQL. CHAPTER 5 REFERENCES [1] M. C. Shaw, J. D. Pigott, L. P. Richardson, Effect of cutting fluid upon chip–tool interface temperature, Trans. ASME 71 (1951) 45–56. [2] S. Paul, N. R. Dhar, A. B. Chattopadhyay, Beneficial effects of cryogenic cooling over dry and wet m achining on tool wear and surface finish in turning AISI-1060 steel, in: Proceedings of the ICAMT- 2000, Malaysia, 2000, pp. 209–214. [3] C. Cassin, G. Boothroyed, Lubrication action of cutting fluids, J. Mech. Eng. Sci. 7 (1) (1965) 67–81. 4] M. Mazurkiewicz, Z. Kubala, J. Chow, Metal machining with high pressure water-jet cooling assistance—a new possibility, J. Eng. Ind. 111 (1989) 7–12. [5] A. Alaxender, A. S. Varadarajan, P. K. Philip, Hard turning with minimum cutting fluid: a viable green alternative on the shop floor, in: Proceedings of the 18th AIMTDR, 1998, pp. 152–155. [6] M. Sokovic, K. Mijanovic, Ecological aspects of the cutting fluids and its influence on quantifiable parameters of the cutting processes, J. Mater. Process. Technol. 109 (12) (2001) 181–189. [7] F. Klocke, G. Eisennblatter, Dry cutting, Ann. CIRP 46 (2) (1997) 519–526. 8] G. Byrne, E. Scholta, Environmentally clean machining processes—a strategic a pproach, Ann. CIRP 42 (1) (1993) 471–474. [9] F. Klocke, G. Eisenblatter, Coated tools for metal cutting-features and applications, Ann. CIRP 48 (2) (1999) 515–525. [10] U. Heisel, M. Lutz, Application of minimum quantity cooling lubrication technology in cutting processes, Prod. Eng. II (1) (1994) 49–54. [11] J. W. Sutherland, An experimental investigation of air quality in wet and dry turning, Ann. CIRP 49 (1) (2000) 61–64. sa Reference: http://www. seminarprojects. com/Thread-minimum-quantity-lubrication#ixzz1TMka1daG

Praying Mantis Sex and Cannibalism

Praying Mantis Sex and Cannibalism The female praying mantis is often painted as an evil seductress, a cannibalistic lover that lures males closer, only to eat them after mating. Is her reputation deserved? Does praying mantis sex always end in cannibalism of the male? Female Mantis Shaming or Truth? Rumors of the praying mantis cannibalistic tendencies began when scientists observed their mating behavior in a laboratory environment. Entomologists would offer a captive female a potential mate and would quite often be horrified to watch the female bite the head or legs off the smaller male- sometimes even before mating. After the male had served his copulatory purpose, he was nothing more than a good meal for the female and her upcoming offspring. For a long time, these observations of praying mantis sex in the lab were thought to be the way things were in the mantid world.   Much Less Common in the Wild After scientists started observing praying mantis sex in a natural setting, the story had a different ending, which is good for the males. When unconfined by laboratory terrariums (and not starving), the majority of praying mantis mating ends with the male flying off unharmed. By most estimates, sexual cannibalism by praying mantis females occurs less than 30 percent of the time outside the lab. Those are better odds for the fellows than what had been seen in the lab. Praying mantis sex, it turns out, is really a rather romantic series of courtship rituals and dances that typically ends satisfactorily and safely for both parties involved. How Males Choose Females Given a choice between females, male praying mantises will move toward females seen as less aggressive (i.e., ones they hadnt just seen eating another male) more often than the more aggressive females. The males also tend to prefer to mate with females that appear fatter and more well fed than others, as the skinnier and hungrier mantises are more likely to eat their mates during or after sex. This could also point to the males being more attracted to females that are healthier, for the betterment of their offspring.   Advantages of Beheading Your Mate There is a decided advantage for the female if she does decide to behead her lover. The praying mantis brain, located in his head, controls inhibition, while a ganglion in the abdomen controls the motions of copulation. Absent his head, a male praying mantis will lose all his inhibitions and consummate his relationship with wild abandon. And what if shes hungry? For certain, a slow-moving and deliberate predator like the praying mantis is not going to pass up an easy meal. If a male makes the unfortunate choice of a hungry female for a mate, hes probably going to be toast after theyve mated. Either Way Could Benefit the Males A twist: Being eaten by the female paradoxically may mean that that particular male has more of his genetics making it to the next  generation  if more of his sperm fertilize his mates eggs while she is eating parts of him. More eggs are laid by females who eat their mates as well (88 vs. 37.5 in one study). However, if a male can mate more than once, that also increases his odds of having his genetics passed on.

Battle of Resaca de la Palma - Mexican-American War

Battle of Resaca de la Palma - Mexican-American War Battle of Resaca de la Palma - Dates Conflict: The Battle of Resaca de la Palma was fought May 9, 1846, during the Mexican-American War (1846-1848). Armies Commanders Americans Brigadier General Zachary Taylor2,222 menMexicansGeneral Mariano Aristaapprox. 4,000-6,000 men Battle of Resaca de la Palma - Background: Having been defeated at the Battle of Palo Alto on May 8, 1846, Mexican General Mariano Arista elected to withdraw from the battlefield early the next morning. Retreating down the Point Isabel-Matamoras road, he sought to prevent Brigadier General Zachary Taylor from advancing to relieve Fort Texas on the Rio Grande. In looking for a position to make a stand, Arista sought terrain which would negate Taylors advantage in light, mobile artillery which had played a critical role in the previous days fighting. Falling back five miles, he formed a new line at Resaca de la Palma (Resaca de la Guerrero) (Map). Here the road was hemmed in by thick chaparral and trees on either side which would negate the American artillery while providing cover for his infantry. In addition, where the road cut through the Mexican lines, it passed through a ten-foot deep, 200-foot wide ravine (the resaca). Deploying his infantry into the chaparral on either side of the resaca, Arista placed a four-gun artillery battery across the road, while holding his cavalry in reserve. Confident in the disposition of his men, he retired to his headquarters in the rear leaving Brigadier General RÃ ³mulo DÃ ­az de la Vega to oversee the line. Battle of Resaca del Palma - The Americans Advance: As the Mexicans departed Palo Alto, Taylor made no immediate effort to pursue them. Still recovering from the May 8 fight, he also hoped that additional reinforcements would join him. Later in the day, he elected to push forward but decided to leave his wagon train and heavy artillery at Palo Alto to facilitate more rapid movement. Advancing along the road, the lead elements of Taylors column encountered the Mexicans at Resaca de la Palma around 3:00 PM. Surveying the enemy line, Taylor immediately ordered his men forward to storm the Mexican position (Map). Battle of Resaca de la Palma - The Armies Meet: In an attempt to repeat the success of Palo Alto, Taylor ordered Captain Randolph Ridgely to move forward with the artillery. Advancing with skirmishers in support, Ridgelys gunners found it slow going due to the terrain. Opening fire, they had difficulty spotting targets in the heavy brush and were nearly overrun by a column of Mexican cavalry. Seeing the threat, they switched to canister and drove off the enemy lancers. As the infantry advanced through the chaparral in support, command and control became difficult and the fighting quickly degenerated into a series of close-quarter, squad-sized actions. Frustrated by the lack of progress, Taylor ordered Captain Charles A. May to charge the Mexican battery with a squadron from the 2nd US Dragoons. As Mays horsemen moved forward, the 4th US Infantry began probing Aristas left flank. Surging down the road, Mays men succeeded in overrunning the Mexican guns and inflicted losses among their crews. Unfortunately, the momentum of the charge carried the Americans a quarter mile further south allowing the supporting Mexican infantry to recover. Charging back north, Mays men were able to return to their own lines, but failed to retrieve the guns. Though the guns had not been seized, Mays troopers succeeded capturing Vega and several of his officers. With the Mexican line leaderless, Taylor promptly ordered the 5th and 8th US Infantry to complete the task. Advancing towards the resaca, they launched into a determined fight to take the battery. As they began to drive back the Mexicans, the 4th Infantry succeeded in finding a path around Aristas left. Lacking leadership, under heavy pressure on their front, and with American troops pouring into their rear, the Mexicans began to collapse and retreat. Not believing that Taylor would attack so soon, Arista spent most of the battle in his headquarters. When learning of the 4th Infantrys approach, he raced north and personally led counterattacks to halt their advance. These were repulsed and the Arista was forced to join the general retreat south. Fleeing the battle, many Mexicans were captured while the remainder re-crossed the Rio Grande. Battle of Resaca de la Palma - Aftermath: The fighting for the resaca cost Taylor 45 killed and 98 wounded, while Mexican losses totaled around 160 killed, 228 wounded, and 8 guns lost. Following the defeat, Mexican forces re-crossed the Rio Grande, ending the siege of Fort Texas. Advancing to the river, Taylor paused until crossing to capture Matamoras on May 18. Having secured the disputed territory between the Nueces and Rio Grande, Taylor halted to await further reinforcements before invading Mexico. He would resume his campaign that September when he moved against the city of Monterrey. Selected Sources Palo Alto Battlefield National Historical Park: Resaca de la PalmaHandbook of Texas: Battle of Resaca de la PalmaUS Army Center for Military History: Guns Along the Rio GrandeTrudeau, Noah Andre. A Band of Demons Fights for Texas. Military History Quarterly Spring 2010: 84-93.

The Five-Task Strategy Making Assignment Example | Topics and Well Written Essays - 500 words

The Five-Task Strategy Making - Assignment Example Monitoring significantly increases the chances of success of the strategy-making process because it offers a critical outlook of the whole exercise, including areas of weakness and how to correct them. Unlike monitoring, evaluation is concerned with what has been achieved. In this exercise, the organization examines the decisions and actions it has taken and determines whether they were successful or not. In case of failure or success, evaluation reveals the reasons for the outcome. The organization can then use this information to develop more effective processes in the future. Corrective adjustments are often done either to increase the success ratio of the process, or to develop better procedures and systems to support future processes (Neluheni, Pretorius, & Ukpere, 2014). The whole process of monitoring, evaluation, and corrective adjustments can be done by either internal or external practitioners. Ultimately, organizations should aim at limiting the amount of monitoring, corrective adjustments and evaluation by conducting highly efficient and effective planning (Valler, Tait, & Marshall, 2013). Thorough planning limits the need for intensive monitoring and evaluation and large-scale adjustments by reducing the number of mistakes made. There are three key elements of strategic planning addressed in this case study. The first is the development of a strategic vision, mission, and core values. The second is setting objectives, while the third is crafting a strategy to attain the objectives and the company vision. In this case, Harry Lindsol, who is a prospective investor, has conducted an analysis of the market and relevant trends before deciding on the best investment option (Thompson, Peteraf, Gamble, & Strickland, 2014). He has also made a strategic investment decision because his course of action is based on comprehensive analysis and evaluation of all relevant factors. A major advantage offered by eBooks relates to editions.

The Good Faith Essay Example | Topics and Well Written Essays - 750 words

The Good Faith - Essay Example Pain helps the body system to make necessary adjustments for the well being of the body. Embracing Pain Pain helps the body to physically withdraw from something that is hurting and therefore makes it possible for more damage not to be done. When a person touches something that is hot, say a hot coal, simultaneously as the pain is felt, the part of the body that is in contact with the hot substance is withdrawn very fast (Goldstein 258; Martinez-Lavin 1). This helps to avoid more damage to the part of the body that was in contact with the hot substance. This literary happens when a body is confronted with something that is hurting – if one sits on a needle accidentally, the pain felt as a result of being pricked will make the person to jump up. People who suffer from Hansen’s disease (leprosy) are insensitive to pain (Launer 467). This negatively impacts on them because they hurt their bodies without knowing – say they may touch a very hot substance without reali zing it is burning them. Some forms of radiation are not painful but are very dangerous to the body (Ozner 1). Because these radiations do not cause pain at the very moment one gets in contact with them, it is not possible to realize that one is exposed to danger. It is clear therefore that pain enables the body to sense danger and engage a physical withdrawal to avert more damage. The next paragraph examines how pain helps in a case where physical withdrawal is not possible, for instance when danger is within the body. Pain alerts the body of a physiological process going on in the wrong direction. Pain which originates from inside the body is an indication of something going on wrong which needs to be corrected. Pain in this case acts as an alarm to the body system to make adjustments to correct the wrongs (Gatchel and Dennis18; Butler and Moseley 10). For instance, abdominal pains are often an indication of stomach infections (Sartelli 1). It will be almost impossible or too late to realize that one has stomach infections or ulcers if no abdominal pain has ever been experienced. This is actually the reason why physicians more often than not do not treat pain but rather are more interested with the location of the pain. The location of pain helps them to diagnose the cause (Cohn and Cohn 530). It is the cause that is treated after which pain goes away – it is not pain that is treated. Therefore, pain sounds the alarm and further points to the direction of trouble. It is only after a person feels some form of pain that a physician is consulted. Therefore, if pain is absent, the problem will build up and will lead to a sudden death. Pain, as shown in the next paragraph, is a medicine of its own. Feeling pain keeps us strong and is a medicine of its own. It has been shown that pain plays a crucial role in triggering healing processes (Richard, David and Lucy 26). British scientists at Bristol University have discovered that the intense pain felt in the c ourse of heart attacks may be very significant in saving lives. They have shown that pain helps to heal heart attacks and prevents arthritis break outs (Richard, David and Lucy 26). They have argued that reducing this pain fades the survival chances of the patients. They have noted that the pain signals felt at the cardiac nerves act as an attraction for stem cells located in the bone marrow. The stem cells move to the heart to repair any damage done by blood clots (Richard, David