Essay on Did the Mayan Civilization Collapse as a Result...

Ever since the collapse of the once powerful Maya civilization, people have been trying to find out what caused it. Authors of the article, “Climate and the Collapse of Maya Civilization”, which include Gerald Haug, Detlef Gà ¼nther, Larry Peterson, Daniel Sigman, Konrad Hughen, and Beat Aeschlimann propose a theory that the Mayans collapsed because of an extended dry period between 760 and 910 A.D. These scientists set out find the answer as to why the Maya civilization collapsed. This question is fairly popular and is often times answered by an extended drought, but they wanted to find geologic evidence of what the climate was like in the same time period hoping that there is an obvious link between the two. This question†¦show more content†¦This mega drought matched up with the Lake Chichancanab sediment record, giving the authors more confidence in their results. They did this for multiple depths of low Ti content on the sediment cores that resulted in the dates of 910, 860, 810, and 760 A.D.. The intervals between these drought periods were all within approximately 40 to 47 years which also is supported in the Lake Chichancanab sediment record. Beginning with the drought in 760 A.D., a drying trend appeared for approximately the next 40 years until a more severe drought occurred at approximately 810 A.D. Another major drought occurred at roughly 860 A.D. ba sed on very low Ti content results. This was finally capped of with another sever drought in 910 A.D. which lasted roughly 6 years. After finding these results, the authors linked the growth and collapse of the Maya civilization directly to the climatic results they found. Although the Cariaco can not totally explain the relationship between climate conditions and the Maya collapse, it still supports that the changes in rainfall was an important factor. They first suggest that the enlargement of the Maya civilization between 550 and 750 A.D. was due to relatively wet conditions. The Ti concentrations are much higher right before the Terminal Classic Collapse period. Not only were they expanding, but they were expanding to the limit of what the environment can sustain making them largely susceptible to drought. Between 750 and 950 A.D., theShow MoreRelatedIs The Classic Mayan Civilization?1558 Words   |  7 Pagesof Anthropology, a collapse is defined as â€Å"†¦a drastic decrease in human population size and/or political/economical/social complexity, over a considerable area, for an extended time.â € (AOC) With Mr. Tainter’s definition of collapse, I will be focusing on one specific civilization, what led to their falling as a society and elaborate on some theories as to why collapses may occur. The development that I am going to be discussing is the Classic Mayan civilization. The civilization was located in MexicoRead MoreCollapse of Civilizations1323 Words   |  6 Pagesfactors that lead to the collapse of civilizations are almost directly related to those that created it. Archaeologists characterize collapse by a number of elements, some of which we have evidence for, others we do not. Most archaeologists are unsure of exactly what caused the decline of most civilizations in the ancient world, yet there are many clues to some of the events that could have contributed. The collapse of the ancient Roman Empire, the Mesoamerican Mayan, and the Egyptian culturesRead More Collapse of Civilizations Essay1292 Words   |  6 Pagesfactors that lead to the â€Å"coll apse† of civilizations are almost directly related to those that created it. Archaeologists characterize collapse by a number of elements, some of which we have evidence for, others we do not. Most archaeologists are unsure of exactly what caused the decline of most civilizations in the ancient world, yet there are many clues to some of the events that could have contributed. The collapse of the ancient Roman Empire, the Mesoamerican Mayan, and the Egyptian culturesRead MoreWhat Caused the Disappearance of the Mayan Civilization? Essay2582 Words   |  11 PagesIt is still a great mystery how the Mayan civilization disappeared. This complex society reached its zenith around approximately 750 AD. However, within the next two hundred years, this civilization which was epic in its time collapsed and disappeared leaving minimal traces and even more scanty detail about what could have caused this disappearance. This knowledge gap has led to a lot of debate among scholars over the various possible reasons behind what seems to us to be the abandonment and desertionRead MoreThe Mayan Civilization2031 Words   |  9 PagesThe Mayan Civilization at its height was one of the greatest civilization to ever reign on the planet. Their advances in astronomy and mathematics well in advance has helped present civilizations to prosper. But one of the great questions is what happened to the Mayans? Why did they collapse? What caused them to collapse? It is a question that had gone unanswered for decades until some of the worlds great historians and scientist finally concluded to three reasons why the Mayan Civilization collapsedRead MoreWhy Did the Mayan Civilization Collapse?2267 Words   |  10 PagesTo gaze upon the majestic ruins of the Mayan civilisation which collapsed over a thousand years ago, one is often stirred with wonder and a deep sense of curiosity (Diamond, 2005, p157-8). What happened to this great empire and what brought about its demise? The tremendou s task of erecting such elaborate and colossal structures was clearly performed by the hands of a well-organized and adept group of humans (Crist and Paganini, 1980, pg24). Their empire occupied a vast area of roughly 325000 squareRead MoreThe Mayan Civilization1930 Words   |  8 PagesThe Mayan civilization was a bountiful society that flourished from around 300 BCE to 900 CE and, according to some, lasted for up to 3000 years. During the height of their civilization, the Maya built a prominent society and created many inventions, some of which are used today. They are well known for creating the first writing system called cuneiform, the concept of zero, calendars, mathematics, ball-courts, and the length of the solar year measured at about 365.242 days. Having first migratedRead MoreCollapse, By Jared Diamond1697 Words   |  7 Pages In his book Collapse, Jared Diamond gives you an in depth look at societies you may or may not be familiar with and shows you the secrets to their success or failure using his personal 5-point framework. I enjoyed this book and thought he made a lot of good points and had convincing evidence to back it up. While reading you could really tell he knew a lot about the areas he discussed because of the depth he went into with details and descriptions. One complaint I would have about the book is theRead MoreEssay on Factors Leading to The Collapse of Past Societies1693 Words   |  7 PagesAt present day, our worldwide civilization of the human race continues to surpass many achievements of other past societies. Everyday, new technological advances are being achieved and the population is growing faster than it ever previously has. We must look back at past civilizations and analyze them to understand what is in store for us in the future. In the pursuit of progress, human societies cr eate problems they do not have the resources or political motivation to solve, for fear of short termRead MoreWhy Nations Fail - Chapter 5 Review5470 Words   |  22 PagesView Bibliography 3 6 9 12 15    2    Resume of the Key Statements of the Chapter In this chapter, D. Acemoglu and J.A. Robinson explain how growth under extractive institutions is not sustainable in the long term and always leads to the collapse, in one way or another, of these institutions. The title of the chapter, Ive seen the future and it works, is a quotation from the autobiography of Lincoln Steffens (1931). He was then speaking about the communist model that he had discovered

The Foolproof Bad College Essay Samples Strategy

The Foolproof Bad College Essay Samples Strategy Ideas, Formulas and Shortcuts for Bad College Essay Samples A terrible friend doesn't keep a secret. He will always take advantage of your kindness. He will spread your business to everyone with the intention of make people think they are better than you are. A superb friend should be an individual that one may look up to. Facts, Fiction and Bad College Essay Samples Bridget's essay is extremely strong, but there continue to be a couple little things that could be made better. The situation wouldn't have become the same if Huck was an awful friend. There's maybe some evidence to imply that the author was shaken somewhat from a comfortable, materialistic existence. In this instance, attempt to hit the minimal words required and be sure that the essay you will write is packed with relevant info and useful specifics. In this way, it is going to be simpler to structure the content of your essay. 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Appendix H Topic Sentence Outline Free Essays

Associate Level Material Appendix H Topic Sentence and Informal Outline Worksheet Using the Center for Writing Excellence and My Foundations Lab resources, provide the topic sentence and informal outline for your Personal Ethics Statement. †¢ Topic sentence: Many people believe that having good personal ethics is not as important as it used to be. However, ethics are what make a person who they are and how they live their daily lives. We will write a custom essay sample on Appendix H Topic Sentence Outline or any similar topic only for you Order Now A person’s personal ethics are the ideas that they believe are the most important to them, such as honesty, integrity, and morals. Informal outline: Personal ethics are a person’s beliefs about their morals and knowing right from wrong. Having good personal ethics is important when it comes to family, every day society, work and school. Most people who have good personal ethics are likely to be honest in their personal lives and chances are they will also be honest in their professional life as well. Teaching personal ethics within your family is a very important part of many cultures and different family units. In many cases this is where adults have learned their ethics from such things as honesty, integrity, and morals. Ethics in a way can also become traditions and a way of life. Ethics in the workplace and school are important because it creates a safe and secure environment for everyone around. While at school and work there are certain rules that are in place to make sure that everyone feels comfortable. A person having good personal ethics holds him or herself accountable in a moral sense and can determine how their values affect their social environment. How to cite Appendix H Topic Sentence Outline, Essay examples

Single parent adoption Essay Example Essay Example

Single parent adoption Essay Example Paper Single parent adoption Essay Introduction Single parent adoption is a great choice. To be loved in the world should have no argument in whatever case it is. Single parent adoption has just as much love as any other lonely foster child for a two parents. Adoption has had a huge effect on the world as it is today. Many types of adoptions have become existent over generations. Single parent has many people fighting for or against. Love should be no fight. â€Å"Single Parent Adoptions: Why Not?. † 12 Oct. 2001. http://library. adoption. com/articles/single-parent-adoptions-why-not. html For parentless children, adoption provides the nurturing, love, and security that all children deserve. More than just providing a loving and safe environment like fostering children, adoption is a lifetime commitment to the health and welfare of another life in their hands. To best secure families that will provide the best environment for a child, adoption agencies have set up a set of qualifications for adoptive parents. Concerns over single parent adoptions should be laid to rest by the many benefits singles have to offer children in need of a home. Single parents adopt for many of the same reasons as married couples. Single parent adoption Essay Body Paragraphs Single parents have the urge to nurture and raise a child. They seek to have a family unit and share their life with another, just as married couples do. A single parent can provide a loving and nurturing home for a child. Adoptive singles use family and friends for extended support. Give the child their sole attention and all of their love. Financially, they have planned for the future and the majority of single adoptive parents are settled in their careers. With a large percentage of the population’s children living in a broken home, single parents can provide the emotional, financial and physical support without the damage of divorce. If a single parent has met all other qualifications other than marriage, then there is not a valid reason to deny adoption and many reasons to approve. â€Å"Single Parent Adoption. † Can I Still Adopt?. 19 Aug. 2009. 7 Dec. 2009. http://www. parentinghelpcentral. com/single-parent-adoption/single-parent-adoption-can-i-still-adopt/ Ther e are many main reasons why singles choose single parent adoption and they are strongly beneficial to the adoption. Marriage may not be a goal of theirs and they do not ever plan on doing it. These singles might want to get married in their future;however they are not with someone at the moment. Having to be married may be a great risk to themselves and may think it could danger there selves. They may be out of an unhealthy relationship and want to start over with a loving and friendly relationship with a child. Be a parent is more important to them then marriage itself. I know that single parent adoption is a topic in many debates specifically between religious groups. Single parent adopters need to know the cons that go with the pros when considering adoption. Although single parent adoption isn’t considered right amongst Christians, children are much better off in homes with single parents than a bad housing project. Remember as a single parent you need to get outside help since you are the sole earner of the house. Piasecki, Marlene, â€Å"Who Adopts Special Needs Children,† National Adoption Center 1987 http://www. childbirthsolutions. com/articles/preconception/adoption/singleadopting. php (15 December 2009) In 1970, if you had gone to an adoption agency as a single person and applied for a child, you would have, unfortunately, been turned down-it just wasn’t done. In fact, in some States, there were laws against single parent adoption. Now, thousands of children in the United States and other countries are living with single men and women who have chosen to become parents and who have been given the opportunity to provide a loving permanent home for a child. In the last 20 years there has been a steady, sizable increase in the number of single parent adoptions-some people feel that it is the fastest growing trend in the adoption field. Approximately 25 percent of the adoptions of children with special needs are by single men and wom en, and it is estimated that about 5 percent of all other adoptions are by single people. The outlook for single parent adoption is encouraging s it becomes more widely accepted. Access Innovations â€Å"Single parenting† 1999 http://life. familyeducation. com/adoption/nontraditional-families/45788. html (15 December 2009) The desire to nurture and to share life as a family is a strong universal need that is felt by a large number of people and one that is not exclusive to married people or couples. Often a single person finds life incomplete, as one single woman expressed, â€Å"I had a stable job and could give a child many benefits. And I had love that needed to be given and a need to be needed. I wanted some purpose to my life other than my work and my cat. Because many women have pursued careers and put off marriage and having children until they are older, they find that they have reached their thirties, without a husband, but with a compelling desire for a child. Adop tion becomes a viable option for single women who feel that having a child out-of-wedlock is unacceptable or who find that they are infertile. Some men and women feel that they can provide a better life for the children living in institutions or foster care or in countries that cannot provide them with the basic necessities. Loneliness may be another thing in deciding to become a single adoptive parent. Single adoptive parents have proven to be very successful in becoming to allow their own acceptance. The latest research indicates that children raised in single adoptive parent families compare favorably with other adopted children and show a healthy involvement with friends and family as well as in the activities of their age group. http://web. ebscohost. com/src/detail 2009. EBSCO Industries, Inc. (15 December 2009) With the high divorce rate in this country, single parent adoption provides a much more solid environment: a home free from the issues of an unstable, broken home and its effects on the child. Single parents are usually of higher education and have higher incomes in comparison to the country’s average. They have concentrated on their careers and have established a stable home that would benefit a child. Divorced parents are dealing with emotional and financial stress, which can negatively affect a child. A New York Times article reports that out of one-fifth of the nation’s 51. 1 million Caucasian children, over half of the We will write a custom essay sample on Single parent adoption Essay Example specifically for you for only $16.38 $13.9/page Order now We will write a custom essay sample on Single parent adoption Essay Example specifically for you FOR ONLY $16.38 $13.9/page Hire Writer We will write a custom essay sample on Single parent adoption Essay Example specifically for you FOR ONLY $16.38 $13.9/page Hire Writer

Functions And Classification Of Operating Systems Essay Example

Functions And Classification Of Operating Systems Essay Example Functions And Classification Of Operating Systems Essay Functions And Classification Of Operating Systems Essay The OS is the system package that controls the overall operation of the computing machine system. It manages the affiliated hardware, provides a platform to run application plans and an interface for users to interact with the computing machine system. It is responsible for recognizing and organizing memory devices, I/O devices and treating devices. Figure 10.1 displays the function of OS in the computing machine system. An OS provides two types of interfaces: Graphical User Interface ( GUI ) and Command Line Interface ( CLI ) . An OS responds and provides services to the users. Figure 10.1: Functions of OS in the Computer System 10.1.1 Functions of OS : An OS is the indispensable package in the computing machine system. It performs several undertakings to maintain the application package, hardware devices and users of the computing machine system coordination. The OS performs the undermentioned maps: Information Management Information direction refers to the set of services used for recovering, hive awaying, modifying and canceling informations from devices. It has two subsystems, file direction and I/O direction. Process Management Procedure direction is responsible for administering CPU clip between procedures. It besides involves pull offing memory and I/O resources across the procedure in the computing machine system. Memory Management Memory direction controls memory use. At any given case, memory direction keeps path available infinite to hive away the information. Application Programing Interface ( API ) The API assigns entree to application package on all connected hardware devices. User Interface User Interface provides interaction between the computing machine system and users. 10.2 Development of OS Operating systems evolved in seven stages. The six stages viz. unfastened store, batch processing, concurrent execution, timesharing, personal computer science and distributed systems, changed the manner users accessed the OS. Concurrent programming brings multiple innovations to do resource direction effectual. Table 10.2 shows stages and proficient development of an OS. An development of OS started from 1954, when Computer system had non OS, users use to run computing machine system manually. Phases of OS development of are as follows: Open Shop Open Shop introduced IBM 701 that was implemented the on celebrated IBM 701 machine. First user has to do apparatus as per the demand for each computer science. However, in this stage clip and money wasted in puting up machine manual. Users got fixed clip for calculating, although most of the clip was spent puting up the machine manually. Batch Processing Wastage of clip and money in the unfastened store stage was a consequence of user engagement. In this stage, it was clear that normal users were to be kept off from the calculating procedure. This stage besides revealed that the OS was capable of scheduling. Normal users put their occupations on a clout card merely to be processed by computing machine professionals subsequently. The BKS system was the released in this stage. Multiprogramming The aim of concurrent execution was to maintain the CPU every bit busy as possible to use its processing capacity wholly. At the initial phase of multiprogramming stage, the thought was to maintain following plan ready in the memory from where the CPU could take it up instantly. However, in the same stage, hardware interrupts were introduced. Hardware interrupts facilitated shift of procedures. The construct of hardware interrupts made multiprogramming more successful. It besides permitted I/O devices and treating devices to work at the same time. This procedure was called coincident peripheral operation on-line. The constructs of job-scheduling, demand paging, practical memory were introduced in the same stage. Atlas supervisor, B5000 system, Exec II system and Egdon systems were introduced in the concurrent execution stage. Time Sharing Time-sharing allowed processors to go to to petitions from other users while one user was busy executing some I/O map. This manner the CPU could go to to multiple procedures every bit good as users in lesser clip spans. CTSS, Multics File system, Titan File system and UNIX were introduced in this stage. Concurrent The concurrent stage introduced the characteristic of running multiple undertakings at a clip called as multitasking. THE system, RC 4000 system, Venus system, Boss 2 system, Solo system, and Solo Program Text, were the concurrent OS introduced back so. Personal Computing In the personal computer science stage of development, user convenience was on the precedence than recourse direction. The GUI based OS and mouse based interactivity were introduced in this stage merely. OS, Alto system, Pilot system and star user interface were introduced in this stage. Distributed Systems This stage includes computer-networking constituents that enable message go throughing within computing machines and distant process call. WFS File waiters, Unix United RPC, Unix United system and Amoeba systems were launched in this stage. Phase Technical Development Operating System Phase 1: Open Shop An thought of operating systems 1. IBM 701 unfastened store ( 1954 ) Phase 2: Batch Processing Tape batching First-In First-Out and scheduling 2. BKS system ( 1961 ) Phase 3: Multiprogramming Processor multiplexing, Indivisible operations, Demand paging, Input/output spooling, Priority programming and Distant occupation entry 3. Atlas supervisor ( 1961 ) 4. B5000 system ( 1964 ) 5. Exec II system ( 1966 ) 6. Eldon system ( 1966 ) Phase 4: Timesharing Coincident user, interaction and On-line file systems 7. CTSS ( 1962 ) 8. Multics File system ( 1965 ) 9. Titan File system ( 1972 ) 10. Unix ( 1974 ) Phase 5: Concurrent Programing Hierarchical systems, Extensile meats, Parallel programming constructs and Secure analogue linguistic communications 11. THE system ( 1968 ) 12. RC 4000 system ( 1969 ) 13. Venus system ( 1972 ) 14. Boss 2 system ( 1975 ) 15. Solo system ( 1976 ) 16. Solo plan text ( 1976 ) Phase 6: Personal Computer science Graphic user interfaces 17. OS 6 ( 1972 ) 18. Alto system ( 1979 ) 19. Pilot system ( 1980 ) 20. Star user interface ( 1982 ) Phase 7: Distributed Systems Distant waiters 21. WFS File waiter ( 1979 ) 22. Unix United RPC ( 1982 ) 23. Unix United system ( 1982 ) 24. Amoeba system ( 1990 ) Table 10.1: Development of OS 10.3 OS Kernel and shell Every OS consists of a meat and shell. The shell is the user interface, either a CLI or a GUI. This allows the user to login and utilize the computing machine system. The meat is the nucleus of an OS. The OS meat is more complex and is hard to work with straight, therefore the meat is wrapped in a shell A meat consists of the followers: File Manager- A file director provides interface for user to work with file. It performs actions on files such as create, edit, rename, unfastened, edit and so on.. In add-on, it maintains size and permissions about files that are available on the system. Device Driver . Device driver is a plans that controls a specific hardware devices. Each device has alone driver that converts user petition for device to specific cryptography. Memory Manager The memory director responsible for optimal use of the system memory. It allocates and de-allocates memory for hive awaying informations and plans. Scheduler- The scheduler maintains records of present procedures put to deathing by the OS and adds new procedures to the OS. Dispatcher The starter manages procedures. It divides clip into little part such as 50 second, when the clip part is over ; dispatcher allows following procedure to run. 10.4 Categorization of OS Oss have been classified based on parametric quantities such as figure of users that at the same time used the computing machine system, the figure of procedure that OS performs at a clip, and the figure of togss that OS can manage at a clip. The categorization is as follows: Single-User A single-user operating system allows merely one user to login the computing machine system. Single-user OS are intended for place users merely. Multi-user Thie multi-user OS allows multiple users to login and use the computing machine system. In this instance, the OS allocates different resources for each user so that any a job with one user does non impact other users. Single-task The single-task OS permits merely one procedure to run at a clip. Multi-tasking The multi-tasking OS permits multiple plans to put to death at the same clip. Users can run more than one undertaking at a clip. However, as multiple procedures runs at the same clip, this type of OS requires more memory. Multi-tasking OS semen in two theoretical accounts. They are: Time-sharing operating system -Time-sharing OSs usage algorithms to portion CPU clip between multiple procedures. This method creates an semblance that the CPU is put to deathing multiple procedures at the same time. Real-time operating system The real-time operating system is used to command industrial systems and scientific instruments. This type of OS manages computing machine system resources in a manner that specific operation should put to death in precise clip, every time.. 10.5 Operational overview On the boot, an OS makes certain that the system has the required hardware and package. When a user petitions for a resource such as IO or any application plan, the OS cheques permission and so decides whether to allow that petition or deny it. In a multi-user system, the OS agendas resources in a manner that ensures their handiness on petition. The OS records mistakes happening in the procedure. The OS should enter the mistake. The OS supports networking operations excessively. Devicess involved in OS operation are as follows: CPU A computing machine system supports several maps that should run at the same time. It might possible that multiple users are running their plans at the same case. The OS ensures that each user gets sufficient CPU clip to put to death the undertaking. Memory The OS helps users topographic point and recover informations from the primary memory. The OS besides takes attention of user informations that is stored in the secondary memory. Data in the secondary memory is brought to the primary memory on user petition. I/O devices The OS facilitates communicating with all I/O devices. It uses interrupt signals for the same. 10.6 Servicess Offered by OS The major aims of an OS are to do calculating convenient, run application plans and pull off the assorted resources. To accomplish these aims OS provide several services, they are as follows: Program Execution The OS provides users with a convenient environment to put to death plans. The user merely needs to originate plan executing while the OS takes attention of memory allotment for successful executing of the plan. I/O Operations Every procedure involves I/O operations ; nevertheless, internal I/O operations are non seeable to users. OS control all I/O operations. User may alter the default flow I/O operation, therefore for security grounds user are non involved in the I/O operation. File System Manipulation File system use, enables users to make or pull strings files in the OS environment without cognizing physical features of the device. Communicationss At times procedures need to pass on with each other to interchange information. This communicating could be between procedures put to deathing on the same computing machine or processes put to deathing on different computing machine systems. A communicating service enables computing machine system to interchange the procedure with other computing machine systems. Error Detection An mistake in the computing machine system leads to misfunctioning. The OS proctors computing machine systems for mistakes. 10.7 Chapter Review Questions GUI stands for ________________ . ( A ) Graphical User Interface ( C ) Graphical User Interaction ( B ) Group and User Interaction ( D ) None of the above Autonomic nervous system: A Which map of the OS is responsible for pull offing user s informations in the computing machine system? ( A ) Memory Management ( C ) Information Management ( B ) Process Management ( D ) Application Management Ands: Degree centigrade A __________ map allows users to interact with computing machine system. ( A ) Memory Management ( C ) Application Management ( B ) User Interaction ( D ) Information Management Autonomic nervous system: Bacillus A  ­Ã‚ ­Ã‚ ­__________phase of the OS development invents hardware interrupts. ( A ) Timesharing ( C ) Multi Programing ( B ) Concurrent Programing ( D ) None of the above Autonomic nervous system: Degree centigrade Which of the followers is an operating system s nucleus bed? ( A ) Kernels ( C ) Shell ( B ) Device Drivers ( D ) None of these Autonomic nervous system: A Which constituent of the meat maintains records of current procedures, adds new procedures, and removes complex procedures. ( A ) Device Drivers ( C ) Starter ( B ) Scheduler ( D ) None of these Autonomic nervous system: Bacillus Which of the following are theoretical accounts of multitasking OS? ( A ) Timesharing OS ( C ) Real-time OS ( B ) Thread sharing OS ( D ) Real-process OS Autonomic nervous system: A and C 8. CLI stands for ________________________ . ( A ) Command Line Interaction ( C ) Common Line Interface ( B ) Command Line Interface ( D ) Common Line Interaction Autonomic nervous system: Bacillus 9. Which service of an OS allows users to pass on with other computing machines? ( A ) Communicationss ( C ) Program Execution ( B ) Mistake Detection ( D ) I/O Operationss Autonomic nervous system: A 10. A __________component of OS kernel is responsible for pass oning with devices. ( A ) File Manager ( C ) Device Drivers ( B ) Device director ( D ) None of these Autonomic nervous system: Degree centigrade 10.7.1 Answers 1. Angstrom 2. C 3. Bacillus 4. C 5. Angstrom 6. Bacillus 7. A and C 8. Bacillus 9. Angstrom 10. C Drumhead In the chapter, Introduction to Operating System, you learnt about: OS and undertakings performed by the OS Development and categorization of OSs Different maps of the OS Servicess offered by the OS

Interesting Facts About Arsenic

Interesting Facts About Arsenic Arsenic is best known as a poison and a pigment, but it has many other interesting properties. Here are 10 arsenic element facts: Arsenics symbol is As and its atomic number is 33. It is an example of a metalloid or semimetal, with properties of both metals and nonmetals. It is found in nature as a single stable isotope, arsenic-75. At least 33 radioisotopes have been synthesized. Its most common oxidation states are -3 or 3 in compounds. Arsenic also readily forms bonds with its own atoms.Arsenic occurs naturally in pure crystalline form and also in several minerals, usually with sulfur or metals. In its pure form, the element has three common allotropes: gray, yellow, and black. Yellow arsenic is a waxy solid that converts into gray arsenic after exposure to light at room temperature. Brittle gray arsenic is the most stable form of the element.The element name comes from the ancient  Persian word  Zarnikh, which means yellow orpiment. Orpiment is arsenic trisulfide, a mineral that resembles gold. The Greek word  arsenikos means potent.Arsenic was known to ancient man and important in alchemy. The pure e lement was officially isolated in 1250 by the German Catholic Dominican friar Albertus Magnus (1200–1280). Early on, arsenic compounds were used in bronze to increase its hardness, as colorful pigments, and in medicines. When arsenic is heated, it oxidizes and releases an odor similar to that of garlic. Striking various arsenic-containing minerals with a hammer might also release the characteristic odor.At ordinary pressure, arsenic, like carbon dioxide, does not melt but sublimes directly into vapor. Liquid arsenic only forms under high pressure.Arsenic has long been used as a poison, but its readily detected. Past exposure to arsenic may be assessed by examining hair. Urine or blood tests can assay recent exposure. The pure element and all its compounds are toxic. Arsenic damages multiple organs, including the skin, gastrointestinal tract, immune system, reproductive system, nervous system, and the excretory system. Inorganic arsenic compounds are considered more toxic than organic arsenic. While high doses can cause a quick death, low-dose exposure is also dangerous because arsenic can cause genetic damage and cancer. Arsenic causes epigenetic changes, which are heritable changes that occur withou t alteration of DNA. Although the element is toxic, arsenic is widely used. It is a semiconductor doping agent. It adds a blue color to pyrotechnic displays. The element is added to improve sphericity of lead shot. Arsenic compounds are still found in certain poisons, such as insecticides. The compounds are often used to treat wood to prevent degradation by termites, fungi, and mold. Arsenic is used to produce linoleum, infrared-transmitting glass, and as a depilatory (chemical hair remover). Arsenic is added to several alloys to improve their properties.Despite the toxicity, arsenic has several therapeutic uses. The element is an essential trace mineral for proper nutrition in chickens, goats, rodents, and possibly humans. It may be added to livestock food to help the animals put on weight. It has been used as a syphilis treatment, cancer treatment, and skin bleaching agent. Some species of bacteria can perform a version of photosynthesis that uses arsenic rather than oxygen to obtain energy.The element abundance of arsenic in the Earths crust is 1.8 parts per million by weight.  Approximately a third of the arsenic found in the atmosphere comes from natural sources, such as volcanoes, but most of the element comes from human activities, such as smelting, mining (especially copper mining), and release from coal-burning power plants. Deep water wells are commonly contaminated with arsenic.

Unfair terms in contracts Essay Example | Topics and Well Written Essays - 500 words

Unfair terms in contracts - Essay Example For example, if the supplier has the rights to alter the terms of the contract, it is considered to be unfair terms. Often, the obligation on the part of the supplier is very less or negligible as stated by the contract reflecting unfair terms again. Also, if terms of a contract put excess trouble to the consumers, then such contracts are said to contain unfair terms. Such terms tend to affect the faith of the customers2. In cases of mobile phones, credit cards, or tickets for airline or concerts, customers often rely on the suppliers too much to understand the unfair terms involved in the contracts that they enter into with the suppliers. For example, credit card companies often change their rules and policies if they are in need for the return of the money from the customer. Fine print in relation to a contract refers to the minute details of the contract rules that are presented in small print and might not be visible always. It might even possess the right of the suppliers to alter the terms of the contract. In case such a print is completely hidden, then it might not be considered as part of the contract at all and hence the supplier cannot take advantage of that3. Thus it can be understood in this context that if such fine prints are not hidden, then it becomes the responsibility of the customers to read the details without which several terms of the contract might remain unknown to the customers. From the study, thus, it can be concluded that the unfair terms are those terms in the contracts where the supplier has more advantages than the consumers. Moreover fine prints if hidden might not be considered as part of the agreement, but in other cases, they prove to be the customers’ duty to read them to avoid lack of knowledge of the unknown terms in cases of mobile phones, credit cards, airline tickets or concert