Osi Model free essay sample

The OSI Model consists of seven layers. These layers are the application layer, presentation layer, session layer, transport layer, network layer, data link layer, and physical layer. The Application Layer The application layer is responsible for interaction between the operating system and the network services and provides an interface to the system. It provides the user interface to a range of network wide distributed services including file transfer, printer access, and mail (Regan, 2004).Presentation Layer This layer makes sure that information sent by one application layer protocol from a remote system is readable by another application layer protocol in a remote system. It is a translator between different data formats, protocols, and systems. Session Layer The Session Layer allows remote users to establish, manage, and terminate a connection. The session layer enables two users to organize and manage their data exchange and to implement dialog control between the source and destination network devices, including the type of dialog (simplex, half duplex, full duplex) and how long a computer transmits (Regan, 2004). We will write a custom essay sample on Osi Model or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page Transport Layer The Transport Layer is the layer that connects the upper and lower layers together. The transport layer is also responsible for reliable, transparent transfer of data between two end points. Network Layer The Network Layer concerns itself with the addressing and routing necessary to move data from one network to another. Data Link Layer The Data Link Layer is responsible for sending data over the channel. It sends frames, defines the station address, and provides link management.

Help With Sugar Crystal Growing Problems

Help With Sugar Crystal Growing Problems Sugar crystals or rock candy are among the safest crystals to grow (you can eat them!), but they arent always the easiest crystals to grow. If you live in a humid or warm climate, you may need a little extra advice to get things going. There are two techniques for growing sugar crystals. The most common one involves making a saturated sugar solution, hanging a rough string in the liquid, and waiting for evaporation to concentrate the solution to the point where crystals start to form on the string. The saturated solution could be made by adding sugar to hot water until it starts to accumulate in the bottom of the container and then using the liquid (not the sugar at the bottom) as your crystal growing solution. This method tends to produce crystals over the course of a week or two. It fails if you live someplace where the air is so humid that evaporation is very slow or if you place the container in a location where the temperature fluctuates (like a sunny windowsill) so that the sugar stays in solution. If you have had problems with the simple method, heres what you need to do. Grow a seed crystal.The other way to get a seed crystal is to break one off from a piece of rock candy or other sugar crystal. Use a simple knot to tie the seed crystal onto some nylon line (dont use rough thread if you have a seed crystal). When you suspend the crystal in the solution you want it to be completely covered, yet not touching the sides or bottom of the container.Supersaturate your crystal solution.You need as much sugar as possible to dissolve into solution. Increasing the temperature dramatically increases the amount of sugar that will dissolve, so you can get a lot more sugar into boiling water than in hot tap water, for example. Boil the water and stir in more sugar than will dissolve. Its a good idea to pour the solution through a coffee filter to make sure no undissolved sugar remains in the crystal growing solution. You can use this solution as-is or you can let it evaporate for a day or so until you see crystals start to form on the container. If you choose to ev aporate off some of the liquid, reheat it and filter it before introducing the seed crystal. Cool the solution slowly.Sugar becomes much less soluble as the temperature falls from boiling to room temperature or refrigerator temperature. You can use this characteristic to stimulate quick crystal growth. The trick is to allow the solution to cool slowly because if a sugar solution cools very quickly it tends to become supersaturated. This means solutions that cool quickly will become highly concentrated rather than grow crystals. You can slow the cooling of your solution by setting the whole crystal growing container inside a pot of near-boiling water. Either seal the crystal growing container so that no water gets in or else make sure the sides of the crystal container are tall enough that water wont get inside. Let the whole setup slowly drop down to room temperature. Sugar crystals grow slowly so while you might see growth within a couple of hours, it could take a couple of days to be visible. Once the solution has slowly dropped to room temperature, you could continue to t ake it down to the temperature of the refrigerator (if the container will fit inside). If you suspend a seed crystal in a sufficiently saturated solution, you may get crystal growth over a few hours by controlling the cooling of the solution. Therefore, even if you live someplace where you can use the evaporation method for growing sugar crystals, you may want to give this method a go.

Use of Phrasal Verbs by Arab Writers in English Essay

Use of Phrasal Verbs by Arab Writers in English - Essay Example This paper illustrates that Arab learners of English avoid using the phrasal verbs because of the level of difficulty as well as to associated with comprehending the tricky complicated idiomatic meanings of phrasal verbs. Many Several researchers such as Klienmann, Chiang, Dagut, and Laufer supported the claims by made by Schachter that second language learners avoid using phrasal verbs because the difficulty that learners encounter when using the phrasal verbs. Since this paper investigates whether Arab learners of English use fewer phrasal verbs than English writers, the researcher decided to compare to two sets of texts from two different writers. The researcher had difficulty collecting these texts because he wanted to find recent articles. The author went over some American and Saudi newspapers such as Saudi Gazette, Arab news, Asharq Alawsat, Yew New York Post, the Daily Time and the CNN. The researcher finally decided to choose two writers from a Saudi newspaper and another on e from the CNN. The first writer is a Saudi writer, named Mshari Al-Zaydi who writes political articles in Asharq Alawsat Saudi newspaper and the other writer is an American writer, named Peter Hamby, who also writes political articles in the CNN. The researcher collected 10 articles written by Mshari Al-Zaydi and other 10 written by Peter Hamby. The length of the chosen articles length varied from 400 to 800 words which were later on edited to an approximate 300 words article.

Mises vs weber Essay Example | Topics and Well Written Essays - 2500 words

Mises vs weber - Essay Example Mises’ economic analyses of bureaucracy also identified the key differences between bureaucracy, profitable organisations, and unprofitable organisations. He demonstrated that â€Å"government bureaucracy will be unable to engage in an economic calculation and thus will suffer from significant inefficiencies† (Francu and Hociung 159). Consequently, Mises clearly distinguished between bureaucratic management and profit management. On the other hand, Weber, considered as the ‘father’ of bureaucracy, proposed the fundamentals of an explicit theory of bureaucracy (Francu and Hociung 159). He not only pioneered the most â€Å"comprehensive, classic formulations about the characteristics of bureaucracy†, but his ideas also ranged across a whole spectrum of historical, political, economic, and political thought† (Weber (2) 50). According to Francu and Hociung (159), he built on the premise that increasing efficiency of the bureaucratic organisations in carrying out complex activities resulted in the growth of the bureaucratic organisation. Thus, the ideal bureaucratic system was an organisational scheme where competence and not force or tradition formed the basis for the allocation of power (Weber (1) 25-30). Thesis Statement: The purpose of this paper is to investigate the opposing perspectives of Ludwig von Mises and Max Weber on bureaucracy and its consequences on society. It will be argued that Mises had a better understanding and a more realistic approach emphasizing bureaucracy’s adverse effects on society and the economy, as compared to Weber’s views on the need for institutional structure. Mises’ Austrian sociology is similar in some respects to the Weberian school; however they are two different methodologies. They usually address different topics. With the discipline of sociology becoming institutionalized around the Durkheimian or Weberian schools, Anderson (3)

Love in Different Country Essay Example for Free

Love in Different Country Essay Studying in the U.S. for nearly a year, I learned a lot of knowledge and I made a lot of friends. Some of them are foreigners. This years study is very effective for me. In the United States, I found some phenomenons are different between my country and the U.S. Now I mainly want to talk about love in the U.S. and China. The United States is a free country. The United States advocates free development. It pays attention to every persons personality. Some American friends told me that love is very easy in the United States. Both men and women like each other, then they can fall in love. The parents will not hinder the childs decision. So children can choose their partner if they want. In China, love and marriage is a very serious and very important thing. The parents always provide a lot of requirements to their children. For example, if my child is a boy, I will tell him, â€Å"Your wife in the future must be a very nice woman. Her family condition must be consistent with our condition.† because in China, many parents consider that only if both parties are consistent with their conditions, the future life can help each other, and the lives will be happy. In my opinion, I think the two points of view are so different, but each opinion has its reason. My questions are: What makes loving anybody in the United States not similar? How do different people in the U.S. falling in love It also represents the different cultures between China and the U.S. If I were allowed to choose which waysuits me, I will choose the American way because I love freedom. Notes: This needs more information in the second and third paragraphs about the reasons why each country has these â€Å"rules† about love. Then, in the conclusion, you can talk about how freedom is an American trait of love and that these reasons are why you want to choose an American style of love or choosing a partner.

Depictions of Intelligence in Science Fiction Essay -- Literature Mars

To most ancient peoples, Mars was a god, harbinger of war and destruction. While our knowledge of the nature of Mars changed greatly over the ensuing centuries, the attraction Mars holds for the human imagination never waned and continues to our day. Since the discovery that Mars was in fact a planet similar to Earth, the idea that it might harbor intelligent life has enthralled many people. Thus it is only natural that science fiction authors, those members of the human race who put into print the imagination of the species, should turn much of their efforts to speculation about the form and nature of such life. What is striking about this body of literature depicting Mars is its homogeneity. While the methods of presentation may vary from work to work, two themes truly dominate the genre: first, the decay and decline of Mars as a planet and Martian civilization in particular and second, the impact which humanity has on Mars and the ways in which Mars, in turn, impacts those ea rthlings who live on it, especially evident in the transformation of earthlings into Martians. Before discussing these themes, attention must be given to the discovery made by Mariner 4 in July 1965 and confirmed beyond any doubt by Mariner 9 in November 1971 that Mars is incapable of supporting intelligent life. Understandably, this discovery had a profound impact on writers of science fiction concerning Mars, especially concerning intelligent life. While scientists had suspected for quite a while that Mars, in particular the Martian atmosphere, could not sustain intelligent life, it wasn’t until the Mariner missions sent back images of the surface and analyses of the atmosphere that all doubt was laid to rest. Thus authors writing prior to the ... ...artian Theodicy.† Mars Probes. Peter Crowther, ed. NY: DAW Books, Inc., 2002. Lewis, C. S. Out of the Silent Planet. NY: The Macmillan Co., 1973. Moorcock, Michael. â€Å"Lost Sorceress of the Silent Citadel.† Mars Probes. Peter Crowther, ed. NY: DAW Books, Inc., 2002. Moore, Patrick. â€Å"Introduction: The Fascination of Mars.† Mars Probes. Peter Crowther, ed. NY: DAW Books, Inc., 2002. O’Leary, Patrick. â€Å"The Me After the Rock.† Mars Probes. Peter Crowther, ed. NY: DAW Books, Inc., 2002. Resnick, Mike and M. Shayne Bell. â€Å"Flower Children of Mars.† Mars Probes. Peter Crowther, ed. NY: DAW Books, Inc., 2002. Robinson, Kim Stanley. Red Mars. NY: Bantam Books, 1993. Robinson, Kim Stanley. The Martians. NY: Bantam Books, 1999. Strugatsky, Arkady and Boris. Far Rainbow/ The Second Invasion from Mars. Gary Kern, trans. NY: Macmillan Publishing Co., Inc., 1979.

Difficult Emotion Process

My friend and her boyfriend broke up months ago and I also got affected with the break-up because I’ve also become friends with the ex-boyfriend. My friend has started to see other guys and the ex-boyfriend is seeing other girls too. The thing is, the ex-boyfriend, although he is dating with other girls, isn’t over my friend yet and he is using me as his bridge to his ex-girlfriend. That is fine with me. My role would be to update the ex-boyfriend with how the girl is doing.As a friend, I had become a confidante of the girl and she would tell me all so I know that the girl is really over her ex-boyfriend and has started to like the guy he met in one of her Chemistry class. Then, being a friend of the ex-boyfriend, I have learned that he constantly thinks of my friend and still hoping that they could come to reconciliation and eventually get back together. I thought that the ex-boyfriend should know that there won’t be a second chance between them. I have already given him the idea and then, he wanted me to tell everything about what I know of his ex and the current of his ex.I did and this made him confront the ex-girlfriend. Now, my friend is upset at me. Part of me felt guilty and the other makes me think that I shouldn’t for I am just being a friend to both of them. 2. I’ve thought about our friendship and I felt horrible of how it is right now. I felt it’s shouldn’t how friendships should end and I’ve thought friendships shouldn’t be ruined like that. Being in the same school, we can avoid passing each other but we can’t avoid seeing each other. On our free time, I asked her if she wanted to talk and she said yes.Maybe, she felt the same as I did and maybe, she also wanted to talk about it. I think she misses me too! I told her that I regret not having to explain to her right away and that we ended not talking to each other. I explained to her that I felt guilty about having to disclose h er dating with another guy to her ex-boyfriend, but, I think as a friend to her ex, I should help him move on and by telling him about her new guy this would make him think. I also told her that I think she should also tell this to his ex so the ex could start moving on.I said that when she got upset, I also felt the same towards her because I couldn’t understand why she would feel like that and I couldn’t sleep thinking of what she is thinking about me. I said that I also had second thoughts of telling it all to the ex. I also told her that I felt I do not deserve the cold treatment I’ve been receiving from her for days because I think I did the right thing to help the ex and that will not do her any harm and that there is no point of keeping the dating in secret from her ex.And if she felt that I’m not supposed to befriend the ex, it isn’t right. I told her that I wanted to get things back the way it was before all those things happened. 3. Iâ₠¬â„¢ve had confrontations before and every time it is so difficult to go through. I watched her reactions and I saw that she is also saddened. She was listening intently. When it came to the part where I told her of how I do not deserve her kind of treatment, she covered her face and started to cry, but she kept on listening. I think I did all the talking at our conversation.She was so quiet. It was really awkward. I thought, at that moment, I was hurting her. Just to end the silence, I asked her if she wanted to buy a soda. She turned to me and said she missed me. I don’t know if things between us is really okay right now, but maybe it would. I hope it would. Maybe later we could try fixing things. I think what’s important is that we start talking to each other again. Later, I would try to talk her through trusting each other again. 4. The skill was useful, although I wasn’t perfectly sure if I followed it all.But it reminded me of many points that would help m e and it did help me. The timing was perfect, I wasn’t telling any non-sense that could have hurt her more. I think it helped me make my friend understand how I felt. I was so cautious with my words and because I know her well, I know which words could hurt her and which won’t and how I should tell her. I just know how she would take things based on how it is being delivered to her. I didn’t get much response from her at that time, but, later, she’ll talk.