Programmable Logic Controller Essay Example for Free

Programmable Logic Controller Essay To respond to these phenomenal changes, we introduce the second edition of Programmable Controllers: Theory and Implementation. This second edition, like the first, provides a comprehensive theoretical, yet practical, look at all aspects of PLCs and their associated devices and systems. However, this version goes one step further with new chapters on advanced PLC topics, such as I/O bus networks, fuzzy logic, the IEC 1131-3 programming standard, process control, and PID algorithms. This new edition also presents revised, up-to-date information about existing topics, with expanded graphics and new, hands-on examples. Furthermore, the new layout of the book—with features like two-tone graphics, key terms lists, well-defined headings and sections, callout icons, and a revised, expanded glossary— makes the information presented even easier to understand. This new edition has been a labor-intensive learning experience for all those involved. As with any task so large, we could never have done it alone. Luis Bryan holds a Bachelor of Science in Electrical Engineering degree and a Master of Science in Electrical Engineering degree, both from the University of Tennessee. His major areas of expertise are digital systems, electronics, and computer engineering. During his graduate studies, Luis was involved in several projects with national and international governmental agencies. Luis has extensive experience in the field of programmable controllers. He was involved in international marketing activities, as well as PLC applications development, for a major programmable controller manufacturer. He also worked for a consulting firm, providing market studies and companyspecific consultations about PLCs. Furthermore, Luis has given lectures and seminars in Canada, Mexico, and South America about the uses of programmable controllers. He continues to teach seminars to industry and government entities, including the National Aeronautics and Space Administration (NASA). Luis is an active member of several professional organizations, including the Institute of Electrical and Electronics Engineers (IEEE) and the IEEE’s instrument and computer societies. He is a senior member of the Instrument Society of America, as well as a member of Phi Kappa Phi honor society and Eta Kappa Nu electrical engineering honor society. Luis has coauthored several other books about programmable controllers. E RIC B RYAN Eric Bryan graduated from the University of Tennessee with a Bachelor of Science in Electrical Engineering degree, concentrating in digital design and computer architecture. He received a Master of Science in Engineering degree from the Georgia Institute of Technology, where he participated in a special computer-integrated manufacturing (CIM) program. Eric’s specialties are industrial automation methods, flexible manufacturing systems (FMS), and artificial intelligence. He is an advocate of artificial intelligence implementation and its application in industrial automation. Eric worked for a leading automatic laser inspection systems company, as well as a programmable controller consulting firm. His industrial experience includes designing and implementing large inspection systems, along with developing PLC-based systems. Eric has coauthored other publications about PLCs and is a member of several professional and technical societies.

Orangutans :: essays research papers

Orangutans In Malay orang means "person" and utan is defined as "forest'. Thus Orangutan literally means "Person of the Forest". Orangutans are found in the tropical forests of Sumatra and Borneo. They are the most arboreal of the great apes and move amongst the safety of the trees from one feeding site to the next. They are so well adapted to arboreal life that they cannot place their feet on the ground, instead they walk on the outside of their curved foot. There is a scattered population of orangutan in Indonesian Borneo, Malaysia Borneo and northern Sumatra. The different habitats have isolated the orangutan reproductively and geographically from one another creating a "degree of difference" or two subspecies. There are several different characteristics between the two subspecies of orangutans and it has recently been suggested that they may be a separate species. The Borneo male has relatively large cheek pads, a tremendous laryngeal sac and a square shaped face. The Sumatran male has small pads and laryngeal sac, a ginger coloured moustache, a pronounced beard, and a diamond shaped face. Individuals can also be distinguished chromosomally, biochemically, and by their cranial characteristics. There is a great deal of individual variety in the orangutan. "Each orang-utan had a distinct personality and in dealing with such highly intelligent animals in captivity, the keeper's knowledge of the individual was probably more important than the knowledge of the overall behaviour patterns " (Markham, 1980). Orangutan males, however, appear to be totally intolerant of one another, especially the Borneo males who are even aggressive towards females and infants. Male orangutans' participation in social groups is limited to sexual "consortship" with females. However, the Sumatran males tend to stay with females for a longer period of time usually until the birth of the infant. They may stay longer with their partner because of the presence of large predators absent in the Borneo habitat. The orangutan has a menstrual cycle of 29-30 days, menstruation lasting 3-4 days. The Gestation period lasts slightly less than nine months. Offspring pass through three stages, infancy (0-4), juvenile (4-7), and adolescents (7-10). Mother young relationship lasts for a long time, the young usually stay with their mother until they are mature. Female Orangutans are not sexually mature or fully grown until the age of twelve and will not have their first offspring until they are at least fourteen. Males become sexually mature and fully grown at the age of fifteen. The cheek flanges of the male easily recognize the differences between adults and semi-adults. The flanges in the Boreal male curve out ward from the face and develop around the

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Homework 1. The graph below shows the changes in blood pressure and velocity of blood flow as the blood travels from the heart to the leg and returns to the heart: [pic] (i) Compare the blood pressure in the artery with that in the vein. Suggest two reasons for the difference. (3 marks) (ii) Explain the importance of the low velocity of blood flow in the capillary. (2 marks) (iii) In the vein of the leg, the blood pressure is very low while the velocity of blood flow is quite high. Describe how such a high velocity of blood flow in the vein is maintained. 2 marks) (iv) Using the same x-axis given above, sketch a graph to show the change in the oxygen content of the blood as it passes through the blood vessels. (3 marks) 2. The photograph below shows the transverse section of a pig’s heart, which has a structure similar to that of the human heart. [pic] i) Which chamber of the heart, A or B, is responsible for sending out blood to all parts of the body except the lungs? Explain your choice. (3 marks) (ii) (1) Name valve X. (1 mark) (2) In a type of heart disorder, valve X cannot close properly.A man suffering from this disorder may faint easily when he performs vigorous exercise. How would you explain this? (4 marks) (iii) Vessel Y is an artery found in the heart wall. Explain why the risk of heart attack would be higher if fatty substances are deposited on the inner wall of vessel Y. (2 marks) 3. The diagram below shows part of the human circulatory system: [pic] (i) Explain why the lymph in vessel X of a person turns from clear to milky after he has eaten some barbecued pork. 3 marks) (ii) Describe how a continuous flow of lymph in vessel Y of the leg is maintained. (2 marks) (iii) For a patient suffering from a disease called elephantiasis, the lymph vessels in his leg are blocked by a kind of parasitic worm. The leg becomes greatly swollen due to the accumulation of tissue fluid. Explain why the tissue fluid accumulates. (2 marks) (iv) Structure Z may become enlarged when a person has a sore throat. Explain why structure Z is enlarged. (2 marks)

The War Of 1812 Pitted Two Western Powers - 1253 Words

The War of 1812 pitted two western powers against one another, the newly established United States of America and the ancient United Kingdom. Battles raged on for roughly two and a half years, resulting in what many agree ended in a tie. What many disagree with is how the war came to fruition. The two research papers within Retrieving the American Past seek to connect the dots. Firstly, Reginald Horsman cites many concrete reasons behind the warfare: British impressment, calling back the return of American soldiers deemed responsible to serve in the Royal Navy, upon the American army, meddling with maritime trade between the States and European nations (notable France), and inciting or taking part in Indian attacks against the colonies.†¦show more content†¦Although both papers contain the truth, Horsman’s comes much closer to explaining the reasons behind the War of 1812. McCoy speaks through the eyes of the Jeffersonian community, not the entire American population. Due to its smaller scope of the relevancy, Mccoy’s paper is less effective than Horsman’s. Drew McCoy’s paper includes much more depth into the Jeffersonian mindset. The American economy depended largely on the exportation of farm-grown items. Clearly, access to foreign markets is a must for success. These markets were made inaccessible by the presence of British ships scattered about the passageways to France and other European countries. Jeffersonians, peaceful by definition, suggested a lengthy embargo. This holdout would put pressure on Americans to manufacture within their country, thus building a feeling of unity. However, the embargo lasted for a little longer than a year and a half, yielding no positive results for America. Jefferson himself was attacked and accused of resisting commercialism. It was soon decided that foreign commerce was best for the country’s economic welfare. As McCoy states, the Jeffersonians were presented with two options: â€Å"†¦ accept the failure of peaceable coercion to remove restrictions on American commerce and submit to the British orders-in-council, or they could attempt, through military means, a forcible assertion of America’s right to an independent and unrestricted access to