Amazing college essay
Georgia Tech Supplemental Essay Samples
Tuesday, August 25, 2020
Draft Essay Example | Topics and Well Written Essays - 500 words - 2
Draft - Essay Example Thus, this brought an understanding that the qualities and convictions are associated with social practices, conventions and ceremonies that odds their lifestyle (Nel, 2012). The synopsis likewise explained on the issues identified with the separation of the social practices, customs and conventions. It additionally explains on the inborn examples of practices that are transmitted starting with one age then onto the next. The term custom is characterized in the article as a training, which manages the public activity of certain gathering in the general public, while ceremonies are characterized as types of social practices or functions rolling out a specific improvement in the general public. In addition, the article demonstrated that the Africa social orders are connected to the social practices, conventions and standard issues. Additionally, the article clarified these ceremonies include different physical markings on the body, for example, circumcisions or body scarification (Tiley-Nel, 2012). For this situation, these customs are diverse dependent on the ethnic gatherings, whereby the ceremonial practices are images of development stage. Taking everything into account, the paper covers an outline of two articles canvassed in class, which incorporate ââ¬Å"Ndebele culture, customs and ritualsâ⬠by Tiley-Nel and Initiation patterns of conventional South African societies by Nel, J. The articles spread an impression of social, convention and ceremonial practices in African culture. The articles share thoughts identified with the practices among African culture, which are rehearses in a contemporary society during the time spent portraying the change of the young men and young ladies to the grown-up hood. Thusly, this paper has center around recognizing the central matters that are in these
Saturday, August 22, 2020
PROJECT MANGGMENT Essay Example | Topics and Well Written Essays - 2000 words
Task MANGGMENT - Essay Example Inside the Project group, groups are framed dependent on the association of assignments to be performed. The piece of gatherings is to guarantee that time isn't lost in handling of data and subsequently the dynamic procedure (Chapin and Huber-Sannwald 2001). The present undertaking group execution has been upgraded by making a situation where every individual from the gathering has adequate comprehension of the assignments expected concerning execution. Such is the clearness in task that the colleagues can self-screen their presentation and day by day progress. Another element of the gathering is the correspondence channels that exist and should carefully be clung to. These channels are created to guarantee the briefest time slip by between the sender, the recipient, the input and the execution of accessible data. The channels guarantee that the departmental heads get an occasional instructions on the advancement of their gatherings and can be speedy in their reactions and successfully oversee circumstances before they turn crazy. Under interchanges and data preparing, the undertaking supervisory group has a program structure that requests standard gatherings with the essential goal being execution assessment and diagramming the path forward. With momentary objectives being the standard, these unrehearsed gatherings serve to guarantee that the exercises are on target according to method prerequisites. For those exercises not at standard with their projections, important advances are taken to guarantee that any interruption ejects comparable to the advancement of the association (Project Management Institute 2013) The constraints of power are as of now clear with the end goal that colleague knows about the limits of their position. Such cutoff points are set to guarantee that there are no covering obligations that may raise irreconcilable circumstances among the colleagues. Also, to guarantee responsibility, each level
Wednesday, July 29, 2020
3 Proven Strategies to Motivate Your Team
3 Proven Strategies to Motivate Your Team Its a fresh battle every day to find the motivation to get through my to do list. But motivating your team is an entirely different challenge. Its not always as simple as cracking the whip or offering a cash bonus, either. Understanding how people respond to different types of motivation can help us be better leaders and increase the productivity of our teams. It can just take a little science to figure out what works best and which strategies to use to motivate your team. 1. Show Appreciation This first approach sounds simple, but it can make a big difference. In a survey of 2,000 working Americans, 81 percent said theyd work harder for an appreciative boss. 70 percent also said theyd feel better about themselves and their work if their boss showed appreciation more often. For a simple thanks, thats quite a good returnâ"even if it only leads to a small increase in productivity, its worth the effort. According to Wharton professor Adam Grant, A sense of appreciation is the single most sustainable motivator at work. Grant says appreciation differs from motivators like cash bonuses or promotions, which we quickly adjust to, because the sense that other people appreciate what you do sticks with you. A review of over fifty studies from the London School of Economics in 2011 backs up the benefits of showing appreciation for your team. The review found people put in more effort at work when they feel appreciated. Another example of this effect at work comes from behavioral economist Dan Ariely, who conducted an experiment on motivation at an Intel factory in Israel. The study split employees into groups and told each group theyd receive a different reward for completing all their work each day. One group would receive a small cash bonus, another would receive a voucher for free pizza, and a third would receive a compliment from the boss. On the first day, the pizza group was most productive, with the compliment group a close second. The cash bonus group had a small bump in productivity compared to the control group (who received no bonus reward) but was far behind the pizza and compliment conditions. And on the second day of the study, the cash bonus group actually performed worse than those employees not receiving any reward. As the week finished up, productivity leveled out across all three conditions, but compliments ended up as the best option for boosting the workers performance. This study points out how little money can motivate us, and how, in fact, it can even harm our motivation. But another study showed that when we dont feel our work is appreciated, we tend to expect more money as compensation for the same work. So take some time to say thank you to your team members today. That quick act could save you money and increase productivity. Discover team productivity 2. Show Your Team the Fruits of Their Labor Research shows we like to see the outcome of our efforts. An example comes from a study that asked participants to build Lego models, paying a small sum per model that decreased for each one the participants completed. For some participants, the models were immediately disassembled by the researchers. For the rest, their models were kept under the table to be disassembled at the end of the experiment. The team whose work was kept until they were done completed an average of eleven Lego models before quitting, while those whose models were immediately disassembled only managed seven. Even though both groups of participants knew their work would ultimately be destroyed, seeing the fruits of their labor was enough to encourage participants to keep working for longer. A less tangible example comes from a study of a fundraising call center at the University of Michigan. Call center workers were visited by students who had benefited from the centers efforts, for a ten-minute chat. A month later researchers found that those workers whod been spoken to by students were spending 142 percent longer on the phone, and overall the centers income had increased by 171 percent. Even if your team isnt creating something tangible like Lego models, there are ways you can show them the outcomes theyre contributing to. Seeing how their efforts lead to a meaningful result could motivate your team to work harder. 3. Motivate Your Team by Putting Something at Stake We like to get new things, but we hate losing things even more. This principle is called loss aversion. Were so averse to loss that well go a long way to avoid it. Vassilis Dalakas, professor of marketing at California State University San Marcos tested how loss aversion could be used to increase his students motivation to study. He taught the same consumer behavior class twice, with the same material, and introduced optional pop quizzes throughout the class in both cases. The quizzes were worth one point if they were passed, and any student with five points at the end of the class could skip the final exam. The only difference between the two classes was the rule around the final exam. In the first class the exam was required, but students could earn the right to opt out by gaining five points from the quizzes. In the second class the exam was optional from the start but students could lose the right to opt out by not gaining five points. Guess which class passed more quizzes? In class one 43 percent of students earned five points by the end of the class. In class two it was 82 percentâ"almost double. The reason is simply loss aversion. We hate to lose things that we feel belong to us. Its so upsetting that well work harder to maintain our ownership over those things rather than suffer the loss. The students in the second class believed they owned the right to skip the exam and didnt want to have it taken away, so they were more likely to study hard and pass the quizzes. The good news is even small losses work better as motivators than rewards. As we saw in the study above, itâs simply a matter of framing that changes how much weâre motivated to work hard. So you might offer your team the chance to earn an afternoon off by hitting their weekly goals. Or you could promise them an afternoon off every week unless they donât hit their weekly goals. The outcome is the same, but the framing is different. It seems we care more about not losing something thatâs already been promised to us than we do about earning something new. You can combine the various suggestions Iâve explored here to motivate your team. Show your team the fruits of their labor and remember to offer your appreciation for their work, but also try putting something at stake now and then. Each of these approaches has been shown to increase motivation, but together theyre sure to work even better. Teamwork made simple Discover MeisterTask Discover MeisterTask
Friday, May 22, 2020
Animated Voice Images Of Tsunamis - 1031 Words
Animated voice: Footage of tsunamis. https://www.youtube.com/watch?v=vYy2h8IUV1U Yesterday afternoon, at approximately 14:46 JTS time, a massive 9.0 magnitude earthquake occurred just off the east coast of Japan, across from Sendai. The epicentre of the earthquake was at 38.322à °N 142.369à °E and caused a massive tsunami to form. Now weââ¬â¢ll go over to our very own reporter, Willow Jones, who will be explaining tsunamis for you. Willow: Live footage from studio. Hello, Iââ¬â¢m Willow and I will be your reporter for tonight. Now, over 90% of tsunamis are caused by underwater earthquakes like this one. The other causes of tsunamis are underwater landslides, volcanos, and even meteorites! Earthquakes are caused by the movement of tectonic underâ⬠¦show more contentâ⬠¦This goes on like a Mexican wave. When the energy reaches the surface, and has nowhere else to go, it translates outwards like a soundwave. Tsunamis can travel incredibly fast, as fast as 800km an hour! The longer it takes to reach land, the stronger the tsunami gets. Photo of the ring of fire. https://www.google.com.au/search?q=nuclear+disasterssafe=strictbiw=1536bih=690source=lnmstbm=ischsa=Xsqi=2ved=0ahUKEwj00teW1MzOAhUDl5QKHQp_DAAQ_AUIBigB#safe=stricttbm=ischq=ring+of+fireimgrc=De4mj2rYdEQ0_M%3A Early warning systems are installed at intervals on the ocean floor, especially around the ring of fire, where many earthquakes occur. Footage of tsunami. https://www.youtube.com/watch?v=S2ZOmMH4WHA#t=0.3316559 When a tsunami reaches the coastline of a country, the preliminary wave comes and acts like a sudden high tide. This wave then quickly disappears back into the ocean. This action provides an early warning system, letting people that in a few minutes the real tsunami wave is coming. When the real tsunami wave arrives, it will knock anything down that is in its path. Cars, people, and even buildings in the case of a large tsunami, will be pulled down. Although there are early warning systems, the message does not get out quick enough and many people are unaware that a tsunami is soon to come. Now we will go over to former nuclear reactor manager and scientist, Will Morgen, to explain
Saturday, May 9, 2020
The Little-Known Secrets to Help with Dissertations
The Little-Known Secrets to Help with Dissertations Help with Dissertations Features For instance, some public relations firms wish to see journalism degrees. For instance, if you have a look at top-tier MBA programs, you will discover the most prosperous graduates are twenty-somethings with a couple years of corporate or military experience. Our affordable custom made dissertation help on the internet is flexible and tailored to suits the requirements of a student. When you take a look at the university of chicago press. Custom writing means a severe company with high standards. There may also be business letters and perhaps even para-legal documents to be drawn up that only an expert writer should deal with. It's rare to locate an on-line custom writing agency that provides high quality papers at very affordable prices. If your library does not provide access to the dissertation you're searching for, learn more on the subject of dissertation ordering options. If you're alarmed that the result count for your website is low, please confirm the issue having a more thorough check. This exercise will demonstrate how to create a different kind of behavior chart one that will actually do the job for you! Concerning the structure, words should have correct spellings. In such a situation you should inquire for the ideal editing help as there are a variety of errors that are unavoidable as a result of limitation of time and writing materials. Whether you are searching for a particular graduate work, or need to discover what dissertations or theses have been written on a certain subject, ProQuest provides a number of tools to provide help. Dissertation is written by somebody with the intend to get a university degree or diploma. Theses and dissertations must stick to some simple formatting requirements. Theses ordered through ProQuest won't be. A Secret Weapon for Help with Dissertations Now, writing assignments are sometimes a hectic process for s tudents. You should be sure your career objectives and education goals harmonize, if you wish to realize successful carer change. Sometimes you try to do your best and even then you're not able to score well in your home tasks. Aside from the obvious long-term financial advantages, bear in mind your education and your dissertation or thesis will greatly enhance your probability for success in the long term. Things You Won't Like About Help with Dissertations and Things You Will You may even think of a new question and get started working on it, based on the length of time the breakdown lasts. Regardless of what problem you're facing in the duration of your dissertation research process we know what it requires to neutralize them and take your research to the heights of succeeding. Panicking and concentrating on your deficiency of progress isn't productive! To assist you in getting started, we've broken up the process into a few basic steps, and a couple. If you're searching for somewhere to acquire online custom made essay writing help, Exclusive-paper. Professional writers take pride in making the maximum quality content, regardless of what the subject matter may be. To compose a dissertation, time matters a good deal. That means you can see why we must ask for your help. You may rework your analysis when you choose to publish it by yourself. If you need to compose a dissertation discussion part, you can use the services offered by specialists of Essays-Experts. Regardless of what essay topic you've been given, our essay generator will have the ability to finish your essay easily. With our customized essay offer, you can be certain to dissertations any sort of essay help you are searching for. Help with Dissertations - Is it a Scam? Studential have produced a detailed guide to assist you, but there are two primary considerations when writing a personal statement for additional study, the. It is simpler to start your private statement writin g with a template. The dissertation has to be written with good word spelling, coherent sentence program and logically outlined paragraphs. The New Fuss About Help with Dissertations Make certain that you get the correct dissertation writing experts so that it is possible to find a perfect score and graduate with flying colors. In the event you require help on specific chapters of your dissertation, we will assist you out for merely a few dollars too. You may click the student's name to visit a page listing each one of the student's pending and prior reports. The majority of the students face a great deal of difficulties to finish their dissertations before the deadline. On the flip side, you don't need to fret about how you dissertation paper is going to be written, given our professional dissertation writing helpers are extremely familiarized with writing rules and regulation and as such you can expect to acquire a suitable paper and one which has met all of the writing r equirements. Our crew of affordable custom made dissertation writers are going to assist you throughout the writing process. As stated in the introduction, a prosperous dissertation need be correctly structured. Another reason to get assistance from dissertation writing expert is they know precisely what you need and they're going to write it exactly the direction you require. Searching for suitable law dissertation help can be extremely tricky to find since there are a variety of terminologies that most people besides dissertation writing experts don't know about. If you are in need of a literature review in dissertation that's related to your research, then it's possible to trust our Exclusive-paper. The site also has instructions for authors on the best way to produce and submit their electronic thesis or dissertation.
Wednesday, May 6, 2020
Biology 1202 Notes Free Essays
Thursday January 17 Mastering biology course id=MBPOLLACK01639 Life first appeared on earth about 4 billion years ago Origin of life is a hypothesis not a theory Very little oxygen in early earths atmosphere Spontaneous generation of life- random formation of life Millions of species on earth, up to 100 million the expirement of miller and urey showed what? test question a few centuries ago: eople thought that new living things appeared all of the time(spontaneous generation of life) ex: mold growing on food in the mid 1800s Louis Pasteur refuted the theory of spontaneous generation of life he basically left something out but sealed it off and nothing grew on it, then he left it out without being sealed and stuff grew the cell theory- all existing cells come from pre-existing cells about 50 trillion cells make up the human body but all came from the single diploid cell formed from conception conditions on early earth: tmosphere- similar to Jupiter today, no free oxygen, frequent storms with lots of lightning, volcano eruptions, meteor impacts, UV light from the sun, no ozone layer earth before life arose: about 4. 6 billion years old, known because of radiometric dating of meteorites and moon rocks life arose about 3. 8 billion years ago, known because of chemical traces in the rocks, fossilized bacteria was found in rocks 3. We will write a custom essay sample on Biology 1202 Notes or any similar topic only for you Order Now 5 billion years ago no spontaneous generation now but must have happened then how to assemble a living thing: accumulation of organic molecules atalyze reactions reproduce from stored genetic info separate the living thing from the outside environment 3 domains of life- bacteria, archaea, eukarya proteins are needed to synthesize more DNA DNA is used to synthesize RNA which is used to make proteinâ⬠¦DNA-RNA-Protein Ribozymes: RNA molecule that can catalyze reactions, especially those involved in synthesis and processing of RNA itself Conclusion- earliest cells used RNA to store info Ribozymes used to catalyze reactions Thursday January 24th Our species has been here for about 200,000 years PRINCIPLES OF EVOLUTION Theory- general explanation of natural phenomena, developed through extensive and reproducible observations Hypothesis- tentative explanation of observations, educated guess The origin of species was a book published in 1859 by Charles Darwin Main points of book: Evolution occurs in populations, not individuals Natural selection is the mechanism Observation 1-living things tend to reproduce as quickly as possible. Observation 2-constant population size over time (carrying capacity) Inference- competition for survival; differential reproductive success ââ¬Å"I donââ¬â¢t like dogs. They all smell like dogs and poop on my lawnâ⬠variability in structures and behaviors all of this leads to natural selection, organisms best suited to an environment leave the most offspring evolution- the genetic makeup of a population changes over time, driven by natural selection evolution- a change in the allele frequency of a population over time study pakicetus slide 1/29/13 homologous structures suggest common ancestry some homologous structures look different today because of divergent evolution 300 million years ago is when we started to see the type of mammalian limbs similar to the structure today analogous tructures=convergent evolution analogous structure do NOT suggest common ancestry similar environmental forces select for similar structures in unrelated organisms vestigial structures- rudimentary form of and organ more fully formed in ancestor ââ¬Å"evolutionary baggageâ⬠vestigial structures are a type of homologous structure WHAT IS DARWINS POINT ON EAR? ON TEST Developmental biology- the biology of studying organisms from the unicellular stage onward WATCH DARWIN VIDEO All living things have DNA and transcribe it into RNA using amino acids Artificial selection- insecticides, antibiotics etc. Know 3 types of natural selection 1. irectional selection 2. stabilizing selection 3. disruptive selection 1/31/13 evolution of populations GregorMendel- monk who did pea expirements and shed light on the rules of inheritance He worked at the same time as Darwin but his work was overlooked until the 20th century The modern synthesis(early 1940s) ââ¬â a conceptual synthesis of Darwinian evolution, mendelian inheritance, and modern population genetics Evolution- a change in phenotypic constitution of a population owing to a situation on heritable variation among pheneotypes that changes the genotypic constitution of the population Phenotype- all expressed traits of an organism Genotype- the entire genetic makeup of an individual Evolution-a change in allele frequency in a population(change in the gene pool) Population genetics-examines the frequency, distribution, and inheritance of alleles within a population Hardy-weinberg equilibrium- the pop genetics theorem that states that the frequencies of alleles and enotypes in a population will remain constant unless acted upon by non-mendelian processes Allele frequencies- under strict mendelian inheritance, allele frequencies would remain constant from on generation to the next(hardy-weinberg equilibrium) If there is no change in allele frequency there is no evolution Biological species concept- a population whose members can potentially interbreed in NATURE to produce viable reproductive offspring Reproductive barriers- isolate populations from one another Speciation- the process by which new species form EXAM 1 Two requirement for speciation- reproductive isolation of populations(gene flow significantly reduced) and genetic divergence(divergent evolution) Tuesday feb 5 Convergent evolution- no common ancestor with that trait, similar environmental things caused the same evolution Divergent evolution- comes from common ancestors but over time the trait changes Proto means before External barriers Skin-physical barrier to microbial entry, inhospitable environment for growth; dry, dead cells at surface ; sweat/sebaceous glands secreting acids and natural antibiotics like lactic acid Mucuous mebranes of respiratory and digestive tracts well-defined; secretions have antibacterial enzymes Cilia-line the inside of trachea; epithelial cells-smokers cough is from lack of cilia Stomach; if microbes are swallowed, acids(low pH) and protein-digesting enzymes destroy them Lines of defense: Nonspecififc internal defense: Phagocytosis cells: white blood cells in extracellular fluid, amoeboid shape,destroy microbes by phagocytosis-search out bacteria, viral particles, cellular debris-produced in bone marrow. Target stuff that is not in your cells **questions about lymphatic system on exam natural killer cells- white blood cells that destroy body cells infected by viruses and cancerous cells by punching hole in them inflammatory response- caused by large scale microbial invasion through a wound istamine released in response to damage which leads to an increased blood flow at and around the wound in order to wash out the wound. Which leads to inflammation other chemicals- macrophages blood clotting fever= response to microbes establishing major infection. Low grade fever 100-102 can be beneficial slows down microbial reproduction enhances immune system immune response- reaction to specific type of microbe and provides future protection. Involves 2 types of WBC called lymphocytes-B cells and T cells B cells mature in bone marrow T cells are born in marrow but mature in thymus /26/13 humeral cells is same as B cells its called specific immune response because only the cell with the appropriate antibody responds 23,00 coding genes in our genome 3 types of amino acids- hydrophilic, hydrophobic, and ones that can make hydrosulfide bridges most proteins form well with other proteins an antibody is made of four different types of proteins so it takes 4 specific proteins for it to react? Immune system distinguishes self from non self by destroying cells that respond to the bodyââ¬â¢s own molecules Body randomly makes 100,000,000 different antibodies antigen can bind to 1 specific antibody epitope- the three different site where antibodies can bind on a single antigen allergies: type of immune response allergen-recognized as a foreign antigen and binds to B cell ââ¬â coordinated by the humoral immunity response B cell makes plasma cells, releasing allergy antibodies into the bloodstream Antibodies bind to histamine-containing cells in connective tissue Cells release histamine causing inflammatory response such as mucus 1. irst exposure to pollen stimulates B cells to produce allergy plasma cell 2. plasma cells produce allergy antibodies 3. allergy antibodies bind to mast cells 4. re-exposure to pollen results in pollen binding to allergy antibodies on mast cells 5. binding f pollen stimulates mast cells to release histamine, triggering the inflammatory response allergy medication antihistamines others inhibit production of histamine producing cells people without allergies lack genes for allergy-causing antibodies, or produce less of the antibody ormation of a pimple acne develops as a result of blockages In follicles formation of a plug or keratin and sebum(made of fat and the debris of dead fat-producing cells) the natural occurring bacteria propionibacterium acnes can cause inflammation the white blood cells build up(forming a whitehead) and then destroy (by phag ocytosis) the bacteria to prevent infection chicken pox and shingles caused by same virus symptoms are very different after you have had the chicken pox, you become immune to the virus. It is impossible that you may have a slight reaction after re-exposure, such as a few spots and a slight fever. However, you will not get a full blown case of chicken pox more than once shingles: causing agent for herpes zoster is varicella zoster virus, a double stranded DNA virus most people are infected with this virus as children, and suffer from an episode of chickenpox the immune system eventually eliminates the virus from most locations, but it remains dormant in the ganglia adjacent to the spinal cord or the ganglion semilunare in the base of the skull How to cite Biology 1202 Notes, Essay examples
Tuesday, April 28, 2020
Television Fundamentals Essays - Television Technology, Electronics
Television Fundamentals In this report on television I will discuss television signals, the components the make up a television, and how a television produces the picture and sound for the final output. The sound carrier is at the upper end of the spectrum. Frequency modulation is used to impress the sound on the carrier. The maximum frequency deviation is twenty-five kilohertz, considerably less than the deviation permitted by confessional FM stereo. As a result, a TV sound signal occupies less bandwidth in the spectrum than a standard FM broadcast station. Stereo sound is available in TV, and the multiplexing method used to transmit two channels of sound information is virtually identical to that used in stereo transmission for FM broadcasting. The picture information is transmitted on a separate carrier located 4.5 MHz lower in frequency than the sound carrier. The video signal derived from a camera is used to amplitude modulate the picture carrier. Different methods of modulation are used for both sound and picture information so that there is less interference between the picture and sound signals. The full upper sidebands of the picture information are transmitted, but only a portion of the lower sidebands is suppressed to conserve spectrum space. The color information in a picture is transmitted by way of frequency division multiplexing techniques. Two color signals derived from the camera are used to modulate a subcarrier that, in turn, modulates the picture carrier along with the main voice information. The color subcarriers use double-sideband-suppressed carrier AM. The video signal can contain frequency components up to 4.2 MHz. Therefore, if both sidebands were transmitted simultaneously, the picture signal would occupy 8.4 MHz. The vestigal sideband transmission reduces this excessive bandwidth. Because a TV signal occupies so much bandwidth, it must be transmitted in a very high frequency portion of the spectrum. TV signals are assigned to frequencies in the VHF and UHF range. United States TV stations use the frequencies between 54 and 806 MHz. This portion of the spectrum is divided into sixty-eight 6MHz channels that are assigned frequencies. Channels 2 through 7 occupy the frequency range from 54 to 88 MHz. Additional TV channels occupy the space between 470 and 806 MHz. The video signal is most often generated by a TV camera, a very sophisticated electronic device that incorporates lenses and light-sensitive tranducers to convert the scene or object to be viewed into an electrical signal that can be used to modulate a carrier. To do this, the scene to be transmitted is collected and focused by a lens upon a light-sensitive imaging device. Both vacume tube and semiconductor devices are used for converting the light information in the scene into an electrical signal. The scene is divided into smaller segments that can be transmitted serially over a period of time. It is the job of the camera to subdivide the scene in an orderly manner so that an acceptable signal is developed. This process is called scanning. Scanning is a technique that divides a rectangular scene up into individual lines. The standard TV scene dimensions have an aspect ratio of 4:3; that is, the scene width is four units for every 3 units of height. To create a picture, the scene is subdivided into many fine horizontal lines called scan lines. Each line represents a very narrow portion of light variations in the scene. The greater the number of scan lines, the higher the resolution and the greater the detail that can be observed. United States TV standards call for the scene to be divided into a maximum of 525 horizontal lines. The task of the TV camera is to convert the scene into an electrical signal. The camera accomplishes this by transmitting a voltage of 1 volt for black and 0 volts for white. The scene is divided into 15 scan lines numbered 0 through 14. The scene is focused on the light-sensitive area of a vidicon tube or CCD imaging device that scans the scene one line at time, transmitting the light variations along the lines as voltage levels. Where the white background is being scanned a 0 volt signal occurs. When a black picture element is encountered a 1 volt level is transmitted. The electrical signals derived from each scan line are refereed to as the video signal. They are transmitted serially one after the other until the entire scene has been sent. Since the scene contains colors, there are different levels of light along each scan line. This information is transmitted as different shades of gray between black and white.
Subscribe to:
Comments (Atom)