Operating System Questions and Answers Example

Operating System Questions and Answers Example Questions: What are the relationships between operating systems and the hardware? Answer: Operating system is the mediator between computer hardware and application programs .It also makes all possible effort to utilize hardware resources for the application programs which are install over operating system. Without any Operating system we cannot even access any computer hardware to perform any task required by application. Operating system provides the set of instructions to hardware and takes tasks from the application program. What are the differences between distributed systems, network operating systems? Answer: Sr. No. Network Operating System Distributed System 1 The main difference in network operating system is made up of software and supplementary protocols that allow a group of computer network to be used together. On the other hand, distributed operating system is just a conventional centralized operating system however runs on numerous independent CPUs. 2 Network Operating System users are aware of multiplicity of machines. Distributed Operating System users are not aware of multiplicity of machines. 3 Performance is badly affected or even stalled if hardware is faulty. It is more reliable or fault tolerant and can perform even if certain part of the hardware starts failing. What is multicasting? Answer: In computer networking, multicast is collection of message where information is addressed to a group of destination computers simultaneously. In other words the information from the source can be transmitted to many destination in a single transmission or also it can be the information from many sources transmitted to many destination in a single transmission using different network devices and different transmission mediums. 4 What is the meaning of paging, explain by providing examples? Answer A technique used to create virtual memory inside operating systems which can confirm that the data you need is available as fast as possible. The operating system fakes a certain number of pages from your ROM (storage disks) to RAM (main memory slot). When an application needs a page that is not in RAM, the operating system copies the required page into RAM and copies another page back to the disk. For example, it reserves some size on disk which acts as ram when needed and if it does not require that size on disk is kept empty for any other data which cannot be addressed on the RAM Example: Some heavy sided application need more RAM than the usually running applications, so to deal with this paging takes place the operating system fakes the size of ram by combining the actual RAM and the virtual paged size on disk to run that application. Â  What are the features of the operating systems for security? Answer: Authentication: encompasses confirming the identity of the person who communicated a message. Encryption :The simple idea of encryption is to encrypt a communicated message so that only the anticipated receiver can decrypt and read it Intrusion detection: Efforts to detect attacks, together which can be based on successful and unsuccessful efforts numbers. Virus Protection: They are basically detection systems, which also have the ability of quarantine the affected files and rebuilding them back to their original state. Firewall: Firewalls are devices that sit on the border between two security fields and observes /log movement between them, occasionally limiting the traffic that can permit between them which are based on assured principles. 6 How do you choose between different accounts on Windows 10 and how do you specify allow/deny for users? Answer: If all the family member are going to use the same pc then they can setup family account. Furthermore it can be also setup for home ,work, school accounts as per need but in all the user who are creating account must have Microsoft account or Also can create a local account that computer. Every user account is also categorised as one or the other: An Administrator account A Standard (User) account This grouping provides a specific level of authorisation to accomplish many system tasks on the Computer. Standard user account permits a user to do make changes that affect only that account, Including: Change or remove the credential. Change the user account image. Change the theme and desktop settings. View, create and delete files, folders. Administrator account credentials are essential to do things such as: Make, change, and remove accounts. Alteration of settings that can affect all the users. Modification in security-related settings. Install and remove apps. Can modify system libraries and files in other user account. Tasks that need administrator authorisation are done via windows dialog Boxes under a Windows Security icon. Add other people to a home PC Add an account to a work or school PC

An Assortment of Memories, a Myriad of Histories Essay -- U.S. History

American society has traditionally been referred to as a â€Å"melting pot,† welcoming people of all races, religions, and heritages to enjoy the â€Å"freedom† that only America could provide. That was not always the case, as incidents such as the internment of Japanese Americans at Manzanar and the Lewis and Clark journey along the Columbia River exhibited American racial intolerance and demonstrated the inherent racism of the Manifest Destiny—an ideal upon which this nation was founded. Today, government agencies such as the National Park Service (NPS) aim to repair the United States’ negative reputation by creating national historic sites, which serve as either a celebration of American history or an apologetic reminder of events that can never happen again. In regards to these sites, the NPS sees its role as â€Å"a powerful shaper of historical images and messages,† capable of â€Å"determining, creating, and memorializing history for all Ame ricans† (Hayashi 53). I argue that the single shared history for all Americans that this statement suggests cannot exist. These American historical sites—manifestations of the history the National Park Service aims to express—present false equations of indigenous and immigrant experience in this country, representing versions of history and heritage that are not equivalent in past temporal scale and present cultural consequence. The erection of two historical sites—California’s Manzanar and the Confluence Project along the Columbia River—exemplify the false equation of immigrant, indigenous, and settler experience in the United States. Upon analysis of these sites, we will see that the history portrayed there cannot be called a shared history because of the truly imbalanced way in which history is actually ... ...that makes up the American melting pot. â€Æ' Bibliography Confluence Project â€Å"The Confluence Project.† Last Modified 2012. Confluence Project Journey Book â€Å"The Confluence Project Journey Book.† Last Modified 2009. Daehnke, John 2012 The Confluence Project (lecture notes). Stanford IHUM 40B Class, May 1. Hayashi, Robert T. 2003 Transfigured Patterns: Contesting Memories at the Manzanar National Historic Site. In The Public Historian 25(4). Pp. 51-71. Berkeley: Regents of the University of California and the National Council on Public History. National Park Service â€Å"Lewis and Clark National Historical Park.† Last Modified April 23, 2012. . National Park Service â€Å"Manzanar.† Last Modified April 4, 2012. .

Piping

Introduction: The term fabrication applies to the cutting, bending, forming, and welding of Individual pipe components to each other and their subsequent heat treatment and nondestructive examination (N DE) to form a unit (piping subassembly) for installation. The term installation refers to the physical placement of piping subassembly, valves, and other specialty items in their required final location relative to pumps, heat exchangers, turbines, boilers, and other equipment; assembly thereto by welding or mechanical methods; final NEED; heat treatment; leak testing; ND cleaning and flushing of the completed Installation.Depending on the economics of the particular situation, fabrication may be accomplished in a commercial pipe fabrication shop, or a site fabrication shop, where portions of the piping system are fabricated into subassembly or modules for transfer to the location of the final installation. As a general rule piping NAPS 21/2 (DNA 65) and larger for nuclear and fossil power plants, chemical plants, refineries, industrial plants, resource recovery, and generation units are most often shop fabricated.Piping NAPS 2 (DNA 50) and smaller Is often shop fabricated where special heat treatment or cleaning practices may be required: otherwise it is field fabricated. Pipelines and other systems involving long runs of essentially straight pipe sections welded together is usually field assembled. In recent years, the infusion of new bending technologies, new welding processes, new alloys, fracture toughness limitations, and mandatory quality assurance (QUA) programs have made piping fabrication and Installation much more complex than In the past.Greater emphasis Is being placed on written procedures for QUA and quality intro (ICQ) programs, special processes, and qualification and certification of procedures and personnel. Improper selection of fabrication or installation practices can result in a system, which will not function properly or will fail before its expected life span. Accordingly, fabrication and installation contractors must work closely with the designer and be aware of the mandatory requirements of the applicable codes, the unique requirements and limitations of the materials, and those of the fabrication and installation techniques being applied.Codes and Standards Considerations: A great many codes and standards apply to piping. It is incumbent on the fabricator and/or Installer to be familiar with the details of these codes and standards since some codes have the force of law, As an example, the SAME 331. 1 Power Piping Coded is referenced by SAME Section I Power Boilers: for piping classed as Boiler External Piping. The latter that is law in most states, contains rules for code stamping, data reports, and third-party inspection. Piping under SAME Section 1113 also has legal standing. Most other piping codes are used for contractual agreements.Most codes preference SAME Section for nondestructive examination methodol ogy and SAME Section XIX for welding requirements. Each of the codes covers a deferent piping practices, some have mandatory requirements, while others only have recommendations. Heat treatment requirements may vary from one to another. The manner in which the code-writing bodies have perceived the hazardous nature of different applications has led to differing NEED requirements. Generally, the codes are reasonably similar, but the owner, designer, fabricator, and installer must meet the specifics of the applicable code to ensure a satisfactory installation.It is essential that the designer be very familiar with the code being used and that purchasing specifications for material, fabrication, and installation be very specific. Reference to the code alone is not sufficient. In the design, a particular allowable stress for a specific material, grade, type, product form, and/or heat-treated condition was selected. The specifications issued for material purchase and fabrication must ref lect these specify to assure that the proper materials and fabrication practices are used. It is also incumbent upon the fabricator and/or installer to be very familiar with the applicable code.Each project should be reviewed in detail. â€Å"Standard shop practices† may not always produce the desired result. Communication between the designer, fabricator, and installer is essential. All should be familiar with the various standards used in piping design. Most piping systems are composed of items, which conform to some dimensional standards such as SAME 836. MM and SAME 836. MM for Pipe, 816. 57 for flanges, etc. The Manufacturers Standardization Society (MS) and the American Petroleum Institute (API) issue other dimensional standards.The Pipe Fabrication Institute (IF) publishes a series of Engineering Standards, which outline suggested practices for various fabrication processes. These standards give excellent guidance for many aspects of piping fabrication not covered by t he codes. The American Welding Society (SAWS) publishes a number of recommended practices for welding of pipe in various materials. Materials Considerations: Piping systems are fabricated from a great variety of metals and nonmetals, material selection being a function of the environment and service conditions. Materials must inform to the standards and specifications outlined in the governing code.Some codes such as SAME Section Ill impose additional requirements on materials beyond those in the material specifications. All fabrication and installation practices applied to these materials must be conducted so as to assure that the final installation exhibits all of the properties implicit in the design. For example, hot bending of certain austenite stainless steels in the assassination range will reduce their corrosion resistance if they are not subsequently heat-treated. Accordingly, a heat treatment to restore these properties should be specified.

Kite Runner Classics Paper Essays

Kite Runner Classics Paper Essays Kite Runner Classics Paper Essay Kite Runner Classics Paper Essay Essay Topic: The Kite Runner It will no doubt have lasting rower, and will be found on the shelves of bookstores and classrooms for years to come. Its wrong what they say about the past, Ive learned, about how you can bury It. Because the past claws Its way out (1). This quote, said by the mall character, Emir, Introduced a universal theme which would play a very Important role throughout the rest of the novel; the theme of sin and redemption. As Irony Nor says. It Is a novel of sin and redemption, a son trying to redeem his fathers sin (148). It seemed as though every memory told by Emir was in some way haunted and tainted by the ins of his past. Emir lived much of his life throughout the novel trying to gain redemption and peace for his sin of betraying his best friend Hosannas. We later discover that Emir is not the only character who is in need of redemption. Emir was told that Baby, the person who he had striver to impress and looked up to his whole life, had committed a sin of his own and had been lying to Emir about it his whole life. This brought Emir too realization that he and Baby were very much alike. And with that came this realization: that Ihram Khan had summoned me here to atone tot just for my sins but for Babys too (226). By the end of the novel, Emir found a way to forgive both him and his fathers sins. He found redemption by erasing the lines of discrimination that has been holding him back all of his life, and adopting Hessians son so that he will have an equal chance at success and happiness. Sorry an d Ihram Khan also looked to Emir for forgiveness and redemption from sins they committed in their pasts. Before they got married, Sorry told Emir about her sinful past with another man. Emir, however stunned and hurt by this truth, realized that e had to forgive her and look beyond her past. How could l, of all people, chastise someone for their past (1 65)? By redeeming Sorry from her sins, Emir almost envied her for her courage to speak the truth, however painful It was. Sorry helped Emir one step closer to realizing that If he was ever going to be redeemed for his sins, he had to gain the courage to speak of It ask Sorry had. Ihram Khan also wanted Malls forgiveness for keeping Babys secret before he dies. He told Emir, l know that In the end, God will forgive. He will forgive your father, me, and you too Forgive your father If you can. Forgive me If you wish. But most Important, forgive yourself (302). Ihram Khan, In many ways, also helped lead Emir to being able to forgive himself and find redemption. Just as he once said, There is a way to be good again (1 This statement, repeated over and over, is the universal truth which makes this novel a classic, that its possible to find redemption and forgiveness from sin. The uses of literary elements in this novel are also those of a classic. Flashback and Treasonable were uses very Truculently Dye Household. I en story Deigns In 2 ands in 2002, but the whole novel is a flashback that brings the reader from Emirs childhood through his manhood. This also makes it so the reader is provided with information about what happened outside of the action that had taken place in the novel as the story unfolds. Foreshadowing sometimes also appeared to signal the coming of a life changing event. One example occurs on page 275, when Emir is nervously eating a grape in the house of a Taliban official. Emir foreshadows, The grape was sweet. I popped another one in my mouth, unaware that it would be the sat bit of solid food I would eat for a long time. This prepares the reader for the violence that unfolded soon after, between Emir and Safes. The dialogue and the narration in this novel used a variety of modes which affected and contributed to the meaning of the work, making it a classic. Both detailed descriptions and casual conversations were used. One feature of the novel is the use of the Fairs language. This helps provide the reader with knowledge about the Afghan culture and traditions. The words are almost always translated, and set apart by commas. L loudest lie to her and say that my pride, my fiftieth, wasnt stung at all (165). By the end of the novel the reader is familiarized with several expressions such as this one. Imagery and symbolism is also introduced in the beginning of the novel and is mirrored by those at the end. The book began and ended with kite flying contests. The imagery of kite-fighting in the beginning portrayed the last happy moments of Hosannas and Emir. At the end, there was a smaller but similar contest between Emir and Hessians son, Sahara, suggesting the redemption and final self-forgiveness of Emir. The flying of kites brought the characters together. For a moment, they were part of a team. The characters enjoyed flying the kites in both the beginning and end of the novel, and it allowed them to momentarily escape their differences and be somewhat mutual. The kites symbolized a momentary sense of freedom. The complexity and growth in Emir is one which demonstrates that The Kite Runner is a classic novel. Maria Elena Caballero-Rob explains that the novel sketches the maturation of its protagonist from a callow beguiled by mythical stories of heroes (99). Emir Khan began as an UN-athletic, shy, and innocent twelve year old boy. He spent most of the time playing with his servant, Hosannas. Both of the boys got picked on; Emir because he was friends with his servant, and Hosannas because he was a Hazard. Emir was always too afraid to stick up for himself, and it was always Hosannas who ended up taking the hits for the both of them. Emir was constantly trying to impress his father, to no avail. Baby very often voiced his concern for the kind of man Emir would turn out to be. He often compared Emir to Hosannas, wondering why his on couldnt be more like Hosannas. His father saw Emirs lack of courage and inability to speak up as a weakness, which was proven to be true. Emir, confused, embittered, and convinced of his servants elevated status in Babys affections, sets about severing ties of a different kind (OBrien 102). Emirs flaw was truly shown when he watched as Hosannas got beaten and raped by a bully named Safes after trying to retrieve Emirs winning kite. Emir stood watching in horror, but didnt say a word in defense of his friend. After encountering this horrible event and feeling uncomfortable about it, Emir selfishly finds a way to get rid of Hosannas and his father. This flaw, hiding, is one that readers can identify with, even if in a negative way. Emir struggles Witt ten memory AT Nils cowardice to act Tort access rater . I en entire novel is Emirs Journey to find ways to cope with himself and with his guilt. The way that Emir tried to ignore his past is a manner of living in which the reader can recognize. He and Baby eventually moved from Afghanistan to America. America, Emir thought, was to be a new beginning. It was be a place where he could forget bout his past, hide away from it. But Emir eventually found that he could not hide from his own guilty conscious. When his future wife, Sorry, spoke of her sinful past, he was reminded of his own, and also his lack of courage. He returned to Afghanistan after hearing that Ihram Khan, an old family friend, had fallen ill. There, Emir was finally forced to face everything that had been lingering with him for decades. He was informed that Emir and his wife was shot and killed by a Taliban after having a child. Emir had haunting dreams in which he was the Taliban man standing in front of Hosannas with a gun pointing at his head. Ihram told Emir that he should go find Hessians son, who was put in an orphanage after the death of his father. There, Emir was faced with much more than he expected. He came in contact with Safes, now a child molesting Taliban killer, with Hessians son. Emir finally overcame his weakness, and stood up to try and get the boy from Safes. When a coward stops remembering who he is God help him (275). For probably the first time in his life, Emir didnt hide and watch. He fought for this boy. The growth from Emirs shy scared boy to a rosaceous and brave man definitely demonstrated the complexity of human nature. It shows yet another reason why The Kite Runner is a classic. This novel had both an interesting and suspenseful plot which will leave every reader stimulated and moved in some way. It contains both political issues and a personal tale about how choices later affect our lives. It provides interesting information about Afghanistan, and the reader learns some of events of both America and the Middle East. Readers can explore a new culture of a previously obscure and peaceful nation that is now a big part of global politics. The Journey of Emir from an insecure boy to a man more at peace is a very relatable plot. Startling, unexpected plot twists provide constant suspense and wonder for the reader throughout the novel. This is the plot of a classic. Now used as summer reading books in multiple high schools, and found on many lists for book clubs, this novel seems as though it will be here to stay. It provides such a vivid glimpse of the life in Afghanistan over the past quarter of a century, and is both enlightening and informational. It is one of the first novels to be written about Afghan after September 1 1, which had for been ignored by writers for a long time. Hopefully it will inspire many writers in the future that this issue is not one to be ignored. #1 New York Times bestseller, this novel will be passed on to future generations for years to come, and will no doubt have the lasting power of a classic novel. The Kite Runner fit every quality in which a classic novel should. It contained a journey with Emir in order to discover the universal truths of sin and redemption. The protagonist, like in all classic novels, was developed and enlightened about these Ruth by the end. This novel also contained many literary elements which greatly enhanced the meaning and feel of the work. The use of sarcasm, foreshadowing, flashbacks, and language were styles used by Hussein to enhance the novel. A classics protagonist, Like Emir, demonstrates growth Ana change, wanly snows ten complexity of human nature. Emir changed tremendously throughout his Journey, and both of his flaws and enlightenment are easy to identify with. The plot was complex, ever changing, and interesting. It is one that will keep readers turning the pages.

The eNotes Blog Welcome to Gilead Casting and Character Analysis for Hulus The Handmaids Tale

Welcome to Gilead Casting and Character Analysis for Hulus The Handmaids Tale Offred Enter to Win The Handmaids Tale and  an Subscription As you may have heard, Hulu will soon be premiering its new series The Handmaid’s Tale, based on Margaret Atwood’s famous novel of the same name, on April 28. The Handmaid’s Tale depicts a dystopian future in which the United States (now called the Republic of Gilead) has been taken over by a conservative theocracy. Women have virtually no rights in this new society, and reproductively viable young women called â€Å"Handmaids† are forced to serve as surrogate wombs for the government elite, most of whom have been left sterile by disease and environmental pollution. In eager anticipation of the show’s premiere, we thought we’d take a closer look at several major characters from the novel to see who is playing them and what we might expect to see from them over the course of the show. Also, enter our raffle* to win a copy of  The Handmaids Tale  and a 1-year subscription to !  Ã¢â€ â€™ *Entries accepted until Monday, April 24, 2017 at 9:00 a.m. PST. Offred Played by: Elizabeth Moss via Hulu Though she is the narrator of The Handmaid’s Tale, we are ultimately told very little about Offred- even her real name remains a mystery. In the Republic of Gilead, Handmaids are only named in relation to their current master, so Offred’s name literally means that she is â€Å"of-Fred.† Offred’s life as a Handmaid is isolating and limited; she is not allowed to read, leave the house alone, or speak freely with others. Offred occasionally describes her life before the revolution when she had a job, a husband, and a young daughter, but she now finds these memories of freedom painful to dwell on. The daughter of a feminist activist, Offred bristles at the repression and exploitation she experiences under the new theocratic government; however, unlike Moira, Offred makes her main goal survival rather than resistance. In the show, Offred will be played by Elizabeth Moss, who you may recognize as Peggy Olsen from Mad Men. Moira Played by: Samira Wiley via jetmag.com Moira is Offred’s best friend from college. Brazen, outspoken, and unapologetically feminist, Moira- unlike Offred- is not surprised by the drastic curtailing of women’s rights under the new regime. While she and Offred are going through Handmaid training at the same center, Moira makes a daring escape and does not return. Offred likes to think that Moira was able to escape Gilead and flee to Canada, but she later finds her working as a prostitute in a secret club for government officials. During this final meeting, Offred is disappointed to see that Moira’s defiant and rebellious spirit seems to have been extinguished; after having been recaptured and tortured by the government, Moira is now resigned to her unhappy existence. Samira Wiley, known for her role as Poussey Washington on Orange Is the New Black, will play Moira on Hulu’s new show. Ofglen Played by: Alexis Bledel via Hulu Ofglen is a fellow Handmaid and Offred’s assigned walking companion. Handmaids are not allowed to walk outside the house alone and must be accompanied by a fellow Handmaid with the expectation that they will police each other’s behavior. Initially, Offred is unsure whether or not Ofglen is a â€Å"true believer,† and she doesn’t dare do or say anything improper. Eventually, Ofglen reveals that she is actually a member of a secret resistance group. As news in Gilead is closely controlled by the government, Ofglen’s connection to the resistance makes her a source of valuable information for Offred. When Ofglen finds out about Offred’s strange relationship with the Commander, she urges her to spy on him for the resistance. In the show, Ofglen will be played by Alexis Bledel, who you may remember as Rory Gilmore on Gilmore Girls. The Commander Played by: Joseph Fiennes via empireonline.com An older, married man, the Commander is a high-level government official and the head of the house in which Offred works as a Handmaid. When the novel begins, Offred has only recently arrived at the Commander’s house and finds him to be a mysterious and intimidating figure. Although he is not supposed to have any contact with Offred outside of the reproductive Ceremony, the Commander begins to secretly invite Offred to his room in the evenings. During these forbidden meetings, he allows Offred to play Scrabble and read magazines, and on one occasion he takes her to an illicit club. As Offred gets to know him better, she realizes that the Commander’s life is empty and unfulfilled despite his considerable power within the regime. It is implied that the Commander is one of the architects of Gilead’s social structure, and though he frequently espouses conservative and sexist ideas, he seems to realize on some level that their experiment has failed. In the show, the Commander will be played by Joseph Fiennes of Shakespeare in Love and American Horror Story. As Fiennes is significantly younger than the Commander is in the novel, it will be interesting to see how his age alters the odd, almost paternal relationship between the Commander and Offred in the book. Serena Joy Played by: Yvonne Strahovski via Hulu Serena Joy is the elderly, infertile â€Å"Wife† of the commander. As a Wife, Serena enjoys the highest female rank in the household, but her sexual and reproductive role is purely symbolic. Offred recognizes Serena from her former career as a religious personality on television prior to the revolution. Before the Republic of Gilead was established, Serena Joy preached that women should stay at home and return to domestic, subservient roles (a lifestyle that she, as a working woman, did not actually practice). Barren, forbidden from working, and trapped in a loveless marriage, Serena Joy appears to be quite unhappy living the wholly domestic lifestyle she once promoted. Like other Wives, Serena views Handmaids as a necessary evil, and though she is not fond of Offred, she desperately desires a healthy baby. Concerned that the Commander may himself be infertile, Serena arranges for Offred to secretly have sex with Nick, the Commander’s chauffeur and gardener, in order to conceive. Serena will be played by Yvonne Strahovski of Dexter and 24. Like Joseph Fiennes, Strahovski is much younger than her character in the book, and we are excited to see how Serena’s youth will impact her already tense and competitive relationship with Offred. We can’t wait to find out how these characters will be interpreted in the show, and we’ll be watching closely to see how faithful the show’s creators remain to the source material. If you want to learn more about The Handmaid’s Tale, we’ve got you covered! Check out our study guide to find in-depth summaries, character analysis, themes, and more. Be sure to enter our raffle giveaway and get your own copy of  The Handmaids Tale  and a 1-year subscription!

Chemical Process Industries Research Paper Example | Topics and Well Written Essays - 1000 words

Chemical Process Industries - Research Paper Example DDT short for dichlorodiphenyltrichloroethane is a pesticide categorized as an organochlorine insecticide. It is white in color, crystalline in form, tasteless and has no identifiable smell. It has a melting point between 108.5–109  °C, vapor pressure of 2.53 Ãâ€" 10-5 Pa at 20  °C. It is highly insoluble in water (about 1  µg/liter) and has Log octanol–water partition coefficient of 7.48 (IPCS, 1989). Figure 1 shows the structure of DDT compound. b. A brief description of the uses to which the product is put. If your product is not itself a product that consumers purchase directly, describe how your product is used to produce something that is directly purchased or used by consumers.   Technical DDT has so far been prepared in every conceivable form. These forms include xylene and petroleum distillate solutions, water-wettable powders, granules, smoke candles, aerosols, charges for vaporizers and lotions. c. A brief description of the usual raw materials used to produce the product, and where THEY are obtained from. Ideally, you will be able to trace the raw materials back to the biosphere: the earth, oceans, rivers and lakes, and the atmosphere.   Technical DDT is prepared by condensing chloral hydrate with chlorobenzene in concentrated sulfuric acid. In the year 1874, it was first synthesized, but its insecticidal properties were unknown till 1939 when Mà ¼ller and his coworkers found out about it (Metcalf, Kapoor and Hirwe, 1971). Chloral hydrate is a hallucinatory drug and a sedative; it is also used as a chemical reagent such as in the preparation of DDT. It is a compound of one molecule of water added to trichloroacetaldehyde and the chemical formula of C2H3Cl3O ­2. Trichloroacetaldehyde is also known as chloral and is formed by chlorination of ethanol. The key reaction is; The second ingredient in producing DDT is

The unique challenges of managing services supply chain Essay

The unique challenges of managing services supply chain - Essay Example tween a manufacturing and service sector supply chain is that manufacturing operations require lots of inventory, while in service operations there is none or little miscellaneous inventory such as office supplies. There is a difference in terms of how the labor is utilized in each supply chain. In manufacturing labor is used for procuring, transporting, and handling physical material, while almost all service industries labor is used to manipulate information and develop relationships. SCM includes supplier relationships, supplier network, and supplier collaboration (Sengupta, Heiser, Cook). Logistics and transportation costs in the supply chain of manufacturing companies are high, while service firms do not incur in these types of costs. The inventory category in manufacturing firms is subdivided into finished goods, work in process, and raw materials. None of those inventory accounts categories exist in the service industry. The service supply chain has more human involvement whic h makes it harder to standardize solutions to problems since they are resolve on case by case basis. In manufacturing lines processes are standardized. Take for instance the service that is provided by a barber. Each individual hair cut service is different because each human on earth has a different set of hair. In order to improve the supply chain of a service company the managers have to divide their strategy into three levels: strategic, tactical, and operational level. The service supply chain is more visible at the operational level. A fast food restaurant can improve its operational level offering by always having three cashiers instead of one taking orders from the customers. Such a strategy would reduce the waiting time of the customers by eliminating the long lines. At the tactical level a service organization such as the global managing consulting firm Accenture can begin recruiting its new batch rookie college graduates a year become the students graduate. Giving these