Emission Spectrum Definition in Science

In general, an emission spectrum describes the wavelengths of the electromagnetic spectrum emitted by an energetic object. What this object is depends on the scientific discipline. In chemistry, an emission spectrum refers to the range of wavelengths emitted by an atom or compound stimulated by either heat or electric current. An emission spectrum is unique to each element. The emission spectrum of burning fuel or other molecules may also be used to example its composition. In astronomy, the emission spectrum generally refers to the spectrum of a star, nebula, or another body. How an Emission Spectrum Is Produced When an atom or molecule absorbs energy, electrons are bumped into a higher energy state. When the electron drops to a lower energy state, a photon is released equal to the energy between the two states. There are multiple energy states available to an electron, so there are many possible transitions, leading to the numerous wavelengths that comprise the emission spectrum. Because each element has a unique emission spectrum, the spectrum obtained from any hot or energetic body may be used to analyze its composition.

Post Traumatic Stress Disorder and the Use of Technolgy for a Cure Research Proposal

Essays on Post Traumatic Stress Disorder and the Use of Technolgy for a Cure Research Proposal The paper "Post Traumatic Stress Disorder and the Use of Technolgy for a Cure" is an excellent example of a research proposal on medical science. Post Traumatic Stress Disorder refers to the conditions that individuals experience when they have exposed to one or more harrowing events, which includes fighting in a war, accidents, threat to death and sexual assault. Fear and powerlessness are attributed to this condition. In most cases, the diagnosis is administered when the symptoms recur over a month upon the occurrences of the event (Thomas, 2008). The purpose of this study is to examine research questions and hypotheses on Post Traumatic Stress Disorder among adolescents and the use of technology for a cure. It is imperative to note that, technology, in this case, involves the use of the traumatic stressors, which incorporates internet, and computer-based treatments, which include virtual reality treatments. Research questions and relevant Statement of Hypotheses   Research question 1: What are the traumatic and universal stressors that are attributed to the increased symptoms of Post Traumatic Stress Disorder among adolescents? Hypothesis I: The youth reports primary life stressors that do not meet DSM-IV criterion A1 for PTSD, will report an equivalent figure of indicators of PTSD comparable to the youth exposed to stressors not meeting the DSM-IV criterion A1 (Thomas, 2008). Research Question 2: What kinds of stressors and life experience that distinguishes the youth who give clinically fundamental signs of PTSD in the nonexistence of a certified traumatic stressor? Hypothesis II: The youth reports primary life stressors that involve key disruptions of family associations or loss of a close acquaintance will give a report of a higher figure of PTSD signs comparable with the youth who report other significant life stressors. Hypothesis III: The present DSM-IV PTSD standard AI for traumatic stressors that needs specific fear of death or grave injury will envisage augmented sum sign report of the past six or so months PTSD among the adolescents who are exposed to the traumatic stressors under the virtual reality treatment (Thomas, 2008). Hypothesis IV: Adolescents of relatively younger age exposed to Potential Traumatic Stressors (PTS) will have a higher possibility of exposure comparable to their older counterparts on the same kind of stressor to certify fear of grave injury or death relative to the stressors (Thomas, 2008). Hypothesis V: The youth repeatedly exposed to potentially traumatic stressors of a vicious form will give a report of the immense overall figure of PTSD signs comparable to youth exposed to an individual traumatic stressor of an aggressive form. Hypothesis VI: The youth exposed to virtual reality traumatic human stressors are expected to report more signs of PTSD comparable with their counterparts exposed to natural traumatic stressors.

A Couple Of Yahoos Essay Example For Students

A Couple Of Yahoos Essay David Filo was born in Wisconsin 1966 to Jerry, an architect, and Carol, an accountant, but he was raised in Moss Bluff, Louisiana. There they live in what is called an alternative community. They live semi-communally with six other families, sharing gardening duties and a kitchen. Filo attended Tulane University in New Orleans, Louisiana, receiving a bachelors degree in computer engineering. He continued his education at Stanford University in Palo Alto, California. Jerry Yang was born Chih-Yuan Yang in Taiwan in 1968, and was raised by his mother, Lily, an English and drama teacher, after his father died when he was only two. He immigrated to the United States when he was ten years old with his mother, grandmother, and younger brother, Ken, settling in the Berryessa suburb of San Jose. Yang spoke Mandarin Chinese and hardly any English, but soon learned it and became a strait-A student. He was admitted to Stanford University, where he obtained his bachelors and masters degree in electrical engineering in 1990. It was there that he met David Filo. Filo and Yang were doctoral students in computer engineering. As one of their assignments they were working on the computer-aided design of computer chip circuitry. For this project they were set up in an office which was really a trailer that was filled with computers and equipment. I was terribly bored, Filo stated, And with our faculty advisor out of town we started to fool around on the World Wide Web. They soon became very frustrated with the World Wide Web. It seriously lacked any type of organization. The only was to access a page was to know the URL, or the address to the website. At the time there were books being published with lists of different sites and their addresses, however, this proved to not be very useful as website addresses change quite frequently, so that the books were outdated before they even hit the press. Filo and Yang came up with the idea to provide a kind of roadmap for online users. They designed some software that organized web pages into topics and that could be used immediately to link, or go to those pages. In early 1994, Jerrys Guide to the World Wide Web was born, and the name was later revised to Jerry and Davids Guide to the World Wide Web. The two provided the service free to all Stanford users. Later that summer the system was dubbed Yahoo! The name is supposed to mean: Yet Another Hierarchical Officious Oracle, but Yang and Filo insist that they selected the name because they consider themselves to be Yahoos. Soon Yahoo! became so busy that Stanfords computers began to crash with all of the Internet traffic. Stanford demanded that they move their program elsewhere. At this point, Yang and Filo were receiving numerous offers to by the program Internet Giants including, America Online and Netscape Navigator. But Filo and Yang refused to sell out, they believed that they could become more successful running the system by themselves. Today Yahoo! has grown to become the worlds favorite guide to the Internet. With more 800,000 users, Yahoo is contacted over 7 million times a day. All the Internet user needs to do is click on Yahoo! and a list of topics ranging from arts to social sciences appears in alphabetical order. Yahoo! also has chat, mail, shopping, and personalizing features. It also has a search engine for children called Yahooligans. After all of their success, David Filo and Jerry yang are still pretty much the same guys they were when all of it began. They dont even care that they have so much money, its just not that important to them. They still live like college kids.