chcj v Essays

chcj v Essays chcj v Paper chcj v Paper 33I-V PLOTS OF LIGHT EMITTING DIODES (LEDs)I. OBJECTIVESa. Collect current-voltage (I-V) data for one resistor and several light emitting diodesb. Plot I versus V for the resistor and the diodesc. Compare the I-V plot of the resistor with those of the diodes II. EQUIPMENTResistor, diodes, 10 volt DC power supply, voltmeter, ammeter, connecting wires III. INTRODUCTIONAn incandescent lamp consists of a metal filament made out of tungsten which is heated to a high temperature by an electric current that passes through it. The filament is enclosed in an evacuated glass envelope to avoid oxidation of the filament by the surrounding air. Most of the light emitted by an incandescent lamp is in the infrared and therefore is not visible. Incandescent lamps are inefficient light sources because only a small part of the electrical power they consume is converted into visible light. Light emitting diodes (LEDs) which are made out of semiconductor materials such as gallium arsenide (GaAs )are muc h more efficient light sources. Below we describe briefly the operating principle of these diodes. Pure semiconductors (also called â€Å"intrinsic†) do not contact electricity at room temperature and are thus not useful for the fabrication of electric and electronic devices. Semiconductors conduct electricity if we dope them with a small amount of impurity atoms. In the case of Silicon (Si) these would be any atom other than Si. Impurities are divided into two broad categories: Donors and Acceptors. A donor is an impurity atom that has more electrons in its outermost shell that is necessary to form chemical bonds with their neighboring atoms. Each Silicon atom has four electrons in its outermost shell; these electrons are involved in forming the chemical bonds with the neighboring Si atoms. An Arsenic (As) atom on the other hand has 5 electrons in its outermost shell. If we add it as an impurity silicon it will act as a donor because it

Business Plan Proposal - Text Voting Services Business Essay

Business Plan Proposal - Text Voting Services Business - Essay Example In the provision of the services, the business intends to use delivery method and marketing so as to reach the population. It is a sole proprietor kind of business which will employ different individuals to accomplish the various roles. Since there is more need to improve on the delivery of information and quality by the lecturers, there is a need to use an efficient system capable of taking and integrating the data to provide timely overview of the level of effectiveness and satisfaction of the service delivered. The Services will be sold, delivered and repaired for organizations or individuals who wish to use them and are actually setting up the Services. Due to the high capital requirement due to the cost of acquiring and installing the software, more capital avenues will be explored to obtain the required capital and intense marketing to counter the already existing products and competitors in the market. Business Aims and Objectives The aim of the business is to become the overa ll market leader in the provision and maintenance of the electronic voting services system within its first year of operation (Oklahoma Small Business Development Center, The Business Plan, 2008). This will be achieved through the following objectives: To acquire a considerable market proportion from existing market competitors To develop a good customer relationship and establish a feedback mechanism to gather the views and improve on service delivery To provide quality Services and offer after sale services such as installation of the software and timely data analysis and delivery with clear interpretation. Market Information Target market The market for the product is defined by organizations and similar entities that need the services of such information management system and to establish their trends. The target market is therefore colleges, universities, the anticorruption groups, the statistical research companies seeking opinions from various quarters of the society and news rooms (Terjesen, & Frederick, 2006). This gives an existing market of considerable potential, and with organizations seeking to update their operations by seeking opinions of employees and customers, the market is bound to grow. Market size The market is one which is growing considering the ever increasing demand for institutions to keep in line with technology and remain relevant. The need for modern quality control mechanisms is on the rise daily and institutions can only provide quality if the obtain well analyzed feedback information. Competitors In the existing market, there are two main competitors who provide electronic voting services in TV and such related applications. A and B have been the only players in the market and have shared the market in the proportion of nearly half each. Company A provides the service through modern software and is therefore fast in delivering the feedback though there are cases of errors that arise due to the high speed and the ineffiency in t heir software. To this they give an error allowance of 5% on the range of results they provide. Based on this, most customers who prefer A’s services are more interested on speed while those interested in precision go for B’s services. The software provided by A is cheaper compared to that of B to large economies of scale enjoyed by A over B. The company orders

(classical old)chinese literature Essay Example | Topics and Well Written Essays - 1750 words

(classical old)chinese literature - Essay Example The title of the â€Å"Written Crossing the Yellow River† sets the place as Yellow River and signals the upcoming stream of pictorial images. Indeed, both the noun â€Å"river† and the verb â€Å"to cross† denote a motion and imply that the narrator sets out on a voyage. The first line begins with a noun and the narrator speaks about a define boat: the boat that he is in. The river was described as â€Å"great†. The reason of its greatness is explained in the second line as to its â€Å"swollen waters† (386). It can be inferred from the second line that the weather is either extremely bad or the narrator is exaggerating the weather conditions since he describes the waters as â€Å"stretched to the sky edge† (386). We understand from the third line that the storm has just broke out. The motion is intensified and accelerated as â€Å"the sky and waves split apart suddenly†. Although it is the boat that wavered back and forth with the wav es, the narrator perceives it as if sky and waves split apart. The waves which obscured the narrator's view, now allow him to see his hometown as we can infer from the forth line. â€Å"The thousands of homes† in his town appear momentarily with the ebb of the tides. In the fifth line, he shifts his focus from homes to the marketplace. The sixth line paints a bit blurry picture, since the narrator's actual perception and his imagination seems to be merged. The adverb â€Å"vaguely† signifies the blurring of perception and imagination as he contemplates mulberry and hemp displayed at the town's marketplace. Indeed, it was impossible for him to discern mulberry and hemp from that distance (if we accept the previous information that he sees the thousands of homes in that distance). However, he sees the mulberry and hemp with his mind eye or â€Å"makes them out†. The one and only symbol of the poem appears when his mind shifts from the actual view to the landscape of his imagination. Indeed, the symbol of â€Å"mulberry and hemp† traditionally stands for China and its cultivated lands. After a momentary distraction, in the seventh line, he brings back his focus to his homeland and fixes his gaze, nevertheless it was too late. While he turned to gaze back, the town has already been disappeared with the flow of the tides. The last line brings us back to the beginning as the waters stretched to the clouds obscuring the subject's view. The last line is metaphorically linked to the second line as the verb â€Å"stretched† repeated twice in the poem. Meanwhile, â€Å"the vast floods† replaced â€Å"swollen waters† and â€Å"the clouds† substituted for â€Å"sky's edge†. The â€Å"vast floods† and â€Å"swollen waters† function like metaphorical curtains first covering then under-covering then covering again the view of the subject. The poet uses the ebb and flow of the tides to create an optic al illusion, which hides and then reveals his homeland. This rhythmic flow of waters reminds the fort-da (Gone! and There!) game. According to Freud, the child plays this game in order to appease his anxiety due to the absence of the mother. In this case, it is the homeland that first â€Å"Gone!† then â€Å"There† again† and the subject tries to overcome his feelings of loss while he leaves his hometown behind. In fact, the rhythmic

The Colonial southeast Term Paper Example | Topics and Well Written Essays - 5250 words

The Colonial southeast - Term Paper Example These periods are the archaic period, the woodland period and the Mississippian period. The archaic period in Louisiana was home to the most primitive mound complex in North America. It was also one of the earliest dated complex constructions in Americas Watson Brake site near Monroe. Furthermore, the woodland period is measured as the poverty point culture. This culture was trailed by the Lake Cormorant cultures of the Tchula period. In addition, the Mississippian period was linked enormously with agricultural practices. In this era, there was the adoption of maize agriculture (Usner 8). Diplomatic history deals with the account of international relations involving states. The diplomatic research tends to be more concerned with the diplomatic age in different countries. The prehistoric study of Louisiana shows that the state was populated by Native Americans who are primarily from the Indian ancestry (Usner 77). The Native Americans lived there for many millennia prior to the influx of the Europeans in the 16th century. The history of Louisiana and the golf South is loaded and quite extensive. ... According to a timeline published by researchers, this state has a number of negotiations which were performed between Louisiana and other states. A succinct outline of the events shows that Louisiana was involved in various issues, negotiations, and treaties with numerous countries. An overview of these events reveals that, in 1783, Louisiana signed a treaty with Paris. In 1786, there was the construction of the first American golf course that was situated in Charleston, South Carolina. Delaware became declared to the American union in 1787. Furthermore, in 1788, more states including Georgia, Maryland, Virginia and South Carolina were also admitted to the American union. In 1789, the U.S. constitution was authorized, and the North Carolina state was also assimilated to the American union. The constitution in America is a document that embodies basic principles that provide guidelines of how to conduct certain aspects in the American republic. The signature on the constitutional doc uments was appended on 17 Sept, 1787 and later approved by nine countries in 21 June, 1788. Moving on to 1791, we get to learn that the Bank of the United States formed Hamilton’s financial plan that was endorsed as his second element. This led to the debut of a constitutional debate between Jefferson and Hamilton in the same year. Additionally, the Bill of Rights was approved by the member states of the union in this same year. Other states owned up to the American union including Tennessee (1796) and Kentucky (1792). In addition, Eli Whitney invented the cotton gin (1793), whereas, in Virginia, the Mint Julep was invented four years subsequent to Eli’s invention. The last outstanding historical happening

The Country Of Egypt Research Paper Example | Topics and Well Written Essays - 4500 words

The Country Of Egypt - Research Paper Example 4.3 Unemployment 12 5 Economic Structure 135.1 Agriculture 13 5.2 Industry 155.3 Services Sector 16 6 International Economic Relations 17 6.1 Foreign Trade by Major Countries 17 6.2 Foreign Trade by Commodities 17 6.3 Foreign Direct Investment 18 7 Major Problems of Economy in Future 19 8 Conclusion 20 Bibliography 21 The Country of Egypt 2 1 Introduction Egypt is well-known for its ancient...Egypt is officially named as the Arab Republic of Egypt, is a state in North Africa which is covering a region of about 1,001,450 square kilometers. This paper contains geographical, demographical, governmental and historical statistics and on also focuses on the economic strategy and formation, the macroeconomic situation and the state's global economic relations to present Egypt's position in the world and its markets. Egypt is located at 1,001,450 square kilometers. It is the world's 38th largest and leading country. It is similar in size to Tanzania, double the size of France, four times the size of the United Kingdom and is further more than half the size of the United State of Alaska. However, due to the dryness of Egypt's climate, population centers are determined all along the narrow Nile Valley and Delta which means that about 99% of the population employs merely about 5.5% of the entire land area. Egypt is surrounded by Libya to the west, Sudan to the south and by the Gaza Strip and Israel to the east. Egypt's significant job in geopolitics branch is from its considered situation that is a transcontinental state; it possesses a land bridge namely, the Isthmus of Suez, located amid Africa and Asia, which sequentially is negotiated by a passable waterway, the Suez Canal that is joined with the Mediterranean Sea and the Indian Ocean through the Red Sea.

Sleeps Relationship to Learning and Memory Essay

Sleeps Relationship to Learning and Memory - Essay Example On the other hand, during REM, EEG waveforms change associated with increased frequencies. This is where memorable dreams occur. Sleep in mammals is described mainly by inactivity of behavior in conjunction with different electrophysiological changes in the motion of the brain.ii Factors like stress, shifting schedules, and longer work contribute to lack of sleeping time. This results to inefficient performance to workers so companies have allotted rooms for quick naps and other businesses have installed apparatus that will improve the results short-term sleeps. Sara Mednick et al. (2002) describe naps to be short periods of sleep which lasts for one hour maximum and likely to enhance one's attentiveness, efficiency and disposition. These brief periods of rest are suitable for people, who are experiencing sleep deprivations, nightshift schedules, and prolonged periods of driving. Daytime naps also improve psychomotor speed and attainment of short-term memory. However, their relation on previously learned information is not yet established although they are common among people with daily information overload. Mednick et al. (2002) suggest the psychological feeling of 'burnout', which is an amplified irritation and frustration brought by decreasing effectivene ss after a lengthened cognitive effort, is not merely a reflection of mental exhaustion but a need for a worn-out mind to experience restoration during sleep.iii Sleep is the only 2. Sleep to Human beings Especially Sleep is the only way by which one can rejuvenate oneself; a mere rest will not be any good as far as the revitalizing factor of sleep is concerned. In relation with that, studies also show the need for the brain to experience the restorative benefits of sleep, and also restore positive attitude emotionally. Matthew Walker (2009) identifies several roles of sleep in cognitive and emotional brain processes.iv 3. Sleep and Human Memory Firstly, Walker observes the role of sleep in memory processing which focused on the declarative memory. Secondly, he relates the ordered structure of sleep and memory stage evolution with the sleep-dependent plasticity models. Thirdly, he discusses the role of sleep in associate memory processing. Fourth, he touches on the emerging advantage of sleep in emotional brain reactivity. Lastly, he proposes a framework of sleep-dependent affective brain processing which will further explain the implications of mood disorders. Neurological studies have shown stimulating role of sleep in the control of brain function and emotional experience. Walker identifies that modulation of affective networks overnight and emotional experiences happened in the past are capable of affecting the restoration and maintenance of the appropriate connectivity for the next-day reactivity. Lisa Marshall and Jan Born mention the role of short wave sleep or the NREM, in benefiting the hippocampus-dependent declara tive memory, and also the valuable for the procedural aspects of memory. 4. Sleep and creativityCreativity has been defined by Mednik as the forming of associative elements into new combinations which either meet specified requirements or are in some way useful. Many studies also have explained the roll of sleep in the creative problem solving process. Denise Cai et al. find REM to be beneficial in terms of improving the associative network construction. It has also enhanced the incorporation of unassociated information,

History of Modern Architecture Essay Example | Topics and Well Written Essays - 1000 words - 1

History of Modern Architecture - Essay Example The postmodern structures aimed seeking meaning and expression various architectural techniques, styles, forms. In order to meet with the aims, the postmodern architecture had to reject the strict rules of the modernism movement. On the other hand the modern structures were purely based on a thrifty use of material and other aspects of postmodern architectures like ornamentation, were absent (Curtis, 1987). The functionalism of modernism movement was dull and unattractive. It compelled the postmodern architects to focus on the communicating meaning; therefore, they start quoting historic traditions of architecture and merging it with modern designing creating new meaning. The revival of columns in structures is a common example, widely practiced throughout the world. This revival was to meet the aesthetical need but to fulfill a technological requirement. Similarly, Prairie home concept was based on designing structures that match humanity and the environment. Frank Lloyd Wright was the leader of this movement, and he named this philosophy organic evolution. Prairie house plan is sweeping horizontal lines and wide open floor plans. Furthermore, the concept of Prairie is characterized with central chimney, one-story projection, and numerous small windows. His ‘Falling water’ is considered as the best example of organic architecture (Curtis, 1987). Postmodernist architecture has evolved from modernism, incorporating traditional ways of architecture through modern technology and innovations. Contrary to a formalism of the International Style of modernism, the postmodernist architecture is based traditional wit, ornamental and reference. In other words the formal styles and functional way developed during modernism is replaced by styles, collide, a form is used. Hence, postmodern architecture revitalized the centuries old traditional