Process of Photosynthesis :: essays research papers

  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Process of Photosynthesis Photosynthesis is process by which plants containing chlorophyll make carbohydrates from water and carbon dioxide in the air in the presence of light. Green plants and certain other organisms use the energy of light to convert carbon dioxide and water into the simple sugar glucose. Photosynthesis provides the basic energy source for virtually all organisms. An extremely important byproduct of photosynthesis is oxygen, on which most organisms depend.   Ã‚  Ã‚  Ã‚  Ã‚   Photosynthesis has far-reaching implications. Like plants, humans and other animals depend on glucose as an energy source, but they are unable to produce it on their own and must rely ultimately on the glucose produced by plants. Moreover, the oxygen humans and other animals breathe is the oxygen released during photosynthesis. Humans are also dependent on ancient products of photosynthesis, known as fossil fuels, for supplying most of our modern industrial energy. These fossil fuels, including natural gas, coal, and petroleum, are composed of a complex mix of hydrocarbons, the remains of organisms that relied on photosynthesis millions of years ago. Thus, virtually all life on earth, directly or indirectly, depends on photosynthesis as a source of food, energy, and oxygen, making it one of the most important biochemical processes known.   Ã‚  Ã‚  Ã‚  Ã‚  Plant photosynthesis occurs in leaves and green stems within specialized cell structures called chloroplasts. One plant leaf is composed of tens of thousands of cells, and each cell contains 40 to 50 chloroplasts. The chloroplast, an oval-shaped structure, is divided by membranes into numerous disk-shaped compartments. These dislike compartments, called thylakoids, are arranged vertically in the chloroplast like a stack of plates or pancakes. A stack of thylakoids is called a granum, the grana lie suspended in a fluid known as stroma. Photosynthesis is a very complex process, and for the sake of convenience and ease of understanding, plant biologists divide it into two stages. In the first stage, the light-dependent reaction, the chloroplast traps light energy and converts it into chemical energy contained in nicotinamide adenine dinucleotide phosphate (NADPH) and adenosine triphosphate (ATP), two molecules used in the second stage of

Network Troubleshooting :: essays research papers

Introduction If you’ve ever been a network administrator, the call you dread the most might be one you receive in the middle of the night by some panicked employee stating that a portion of your critical network has gone down. What troubleshooting options are available to provide answers to your network problem? Besides having a proactive helpdesk that can â€Å"read† the mind of your network, an important part of troubleshooting involves using a network protocol analyzer. If you’ve done your research, you realize that there are many choices on the market today that may satisfy your needs but make a dent your company’s pocket book. Plus, you have to factor in training your helpdesk on how to use this new tool and if it will provide some type of return on investment (ROI). After conducting a thorough research of tools to analyze and troubleshoot a network, we decided to use Ethereal. Many versions such a Sniffer ® Portable by Network General and Observer ® by Network Instruments provided more options but were only available in â€Å"demo† versions and didn’t provide full functionality. Since we wanted to use Tcpdump as one of the tools in our network troubleshooting arsenal, it made sense to run Ethereal since it supports this type of filter. So, what is Ethereal? Ethereal is a network analyzer. It has the ability to read packets from a network, decipher them, and then display the results with a very intuitive GUI. According to the book Ethereal Packet Sniffing, â€Å"the most important aspects of Ethereal are as follows: that it is open source, actively maintained, and free†. After conducting thorough research, Ethereal also supports TcpDump format capture filters, supports over 700 protocols (new ones are added on a regular basis), and the tool can capture data from Ethernet, Token Ring, 802.11 Wireless, etc. For anyone interested in a command line interface (CLI) interface for Ethereal, you’re in luck since there is a CLI available called tethereal. History of Ethereal Ethereal is a fairly mature networking tool that was developed by Gerald Combs back in 1997, but has only been available to users since 1998. Something unique to this tool is the numerous dissectors that are available. If you’re like me, you may ask yourself, what are dissectors? According to Brockmeier, they â€Å"are what allow Ethereal to decode individual protocols and present them in readable format†. Since the code is open source, you will notice every few months that the list of supported protocols has increased due to individual contributions to Ethereal.

Save the Planet Earth

Our planet is in great danger. For the last one hundred or so years, the people of earth have wasted and misused the natural recourses of earth. Several plans have been developed to stop the abuse of earth. Some of these plans I will discuss in this essay, many of which can be executed by any one. Environmental problems have become so complex that many individuals feel they can have no effect on them.Problems like oil spills, hazardous waste, loss of rain forests, endangered species, acid rain, the ozone layer, the municipal waste crisis can feel out of our control. At the very least, these problems require group and corporate action or government intervention. However, there are some things the individual can control. Our waste reduction and recycling activities can make a difference. That's why so many communities began voluntary recycling programs.There are some household items that are dangerous if they are just thrown away with the regular garbage these items can damage the envi ronment and injure plant and animal life some of these may include moth balls, spot removers, aerosol cans, fluorescent light tubes and shoe polish. Your local waste management agency has information on how to properly dispose of these items.A compost bin may be set up in your yard. Compost bins return plant and some food materials to the soil through decomposition so it can be used as a natural soil additive, called compost. Compost improves soil texture, increases the ability of soil to absorb oxygen and water. Compost also suppresses weed growth and reduces the need to add chemicals and pesticides to plants, which may be harmful to the environment.Keeping recycle bens in the kitchen may help to stop people from accidentally throwing into the trash an item that could have been recycled. Some recyclable items include glass, paper, and most types of mettle. You want to be sure that glass, paper and mettle are all separated into different bins. Once these bins are full of recyclable materials they can be given to your local recycle center.Solar panels are a series of mirrors that transform sunlight into solar energy. Solar energy can help heat water and power home appliances. Solar energy is a great source of clean, non-polluting energy.The home is not the only place wear people can pitch in and help the environment. School playgrounds can use recyclable materials for play equipment and to make the play ground safe for the children. Old rubber tires can be made into a recreation area where kids can crawl in and out. Sports coaches may also use old tires, by having the kids run through them, to test the kids stamina and agility. Jungle gyms, slides and swing sets can be made from recycled mettles.The school and public libraries are great examples of the reuse of materials. Books can be barrowed, read and returned instead of every one who wants to read a certain book going and purchasing a copy. The reuse of these books saves thousands of trees that would be used to make copies of books. The library also offers computers that can be used for research, by using the Internet, by taping the local or global newspaper web sights and other research centers around the world. Receiving information through the Internet saves paper and energy consumption is reduced.By taking school buses or car pools to school instead of individual vehicles, students can not only save fuel but also reduce both traffic and air pollution. People may also try to invest in electronic vehicles, which do not pollute. People should make sure to keep maintenance up on their vehicles to prevent unnecessary toxins from entering the environment.The idea of a landfill is a great one, but it won’t work if people continue to believe it is a place for all trash. A landfill is a big divot dug out of the earth for garbage disposal.We need to make sure we don’t put chemicals or non-biodegradable substances into these landfills because they are harmful to plants and anima ls, they may also contaminate our drinking water. A few of these chemicals include antifreeze, insecticide, batteries and Styrofoam, for proper disposal of these items contact your local waste management agency.You can help save natural resources by taking your old belongings that are no longer needed to a second hand store or the Salvation Army. A second hand store is a place where people can purchase donated items at a cheaper price than if they were to buy it brand new. The Salvation Army is much like a second hand store, but the items are free. Most items found at a second hand store or The Salvation Army are articles of clothing. The benefit to donating old items is that when people find what they need at a second hand store or The Salvation Army fewer items are manufactured which means you are saving natural recourses.We can help, over the last twenty to thirty years we have been trying every thing in our power to conserve energy and natural resources, many plans have been dev eloped as to what should be done all of which are very good ones. The problem with these plans is that not every one contributes to the efforts to reduce pollution and waste, in fact most of the people I know believe recycling is a waste of time and they by them selves cannot make the difference.In some cases, I have found myself questioning my efforts. However, it is still important that we don’t quit. If only every one in every home would decide to do their part and help to keep our air clean, our water unpolluted and our wild life safe. The Earth is our home and we need to protect it.

Resistance coursework Essay

My Investigation: I choose to do a nichrome wire because during my preliminary work nichrome shows more resistance compared to nickel and copper wire. This is because the electrons collide with the material of the nichrome wire. Measurements: The things I will have to measure are: the volts and amps and on each interval I take to take readings. I will have to take 5 reading of each volts and amps, so I can work out the resistance, and then I will have 5 resistance readings, from this I will work out an average resistance. Also I will be measuring the wire from 100cm down to 10cm. Diagram: This is how I will set up my circuit: There are particular factors that we have to keep the same in order not to alter the correct results.   Do not alter the positions of the devices during the experiment.   Make sure the total length of wire is exactly 1m.   Record the current and voltage accurately, using the correct units. Always place the crocodile clips on the right measurement.   Before you start the experiment, test the devices being used. If any are faulty, change them.   Leave the power pack set at the same voltage for the whole of the experiment. The surrounding room temperature must be kept, otherwise the particles in the wire will move faster (if the temperature increases). Therefore, this will have an effect on the resistance.   The wire along the metre ruler must be straight and exactly 1m long. Bends in the wire may affect the resistance. The reading of the voltage should be taken promptly after the circuit is connected. This because as soon as a current is put through the wire, it will get hotter. I want to test the nichrome wire when heat is affecting it the least. Safety: This experiment is not too dangerous but it could be if not handled with caution and care. Make sure that the electricity is off at the plug socket when connecting and altering the circuit.   Be careful of any sharp edges on the crocodile clips or on the wire cutters or on the wire once cut. If you cut your self make sure you wash the wound and see a medical nurse if needed. If a fire breaks out switch off the power and use a near by fire extinguisher that is not H2O (because of the electricity) to safely stop the fire.   Make sure the coils in the resistance wire don’t touch and short circuit because this will ruin the experiment and may heat up the wire and catch fire. Do not set the power pack voltage to more than 2V. This is a safety hazard.   If you smell burning, promptly switch off the power pack from the mains.   Make sure that when the power pack is switched on, the near by taps are switched off. If there is any water spilt near by the sockets or surrounding areas, wipe it before you start the experiment.   Make sure the power pack cable or the conducting wires aren’t frayed. Reliability and Accuracy: Reliability: I can rely on my results because I have taken 5 different readings and then taken an average. This is so if one of my results goes wrong then I have four other ones to compare it with so I know if a result is abnormal. I am using an Ammeter to get an accurate current reading and not relying on the approximate readings on the power packs variable controls. Accuracy: I will coil the wire so that there are no short circuits in the wire. I will do this by spacing out the coils and checking it regularly throughout the experiment. This is because if the wire does short-circuit then you will be measuring the resistance of the length of that short-circuited piece of wire and not the whole length of wire. I will also take the reading on the voltmeter as soon as possible so the heat does not affect the resistance. Obtaining My Evidence: During the investigation, I changed the length of the wire by 10cm to see if it affects the resistance and the amount of current I was going to use. Initially I had decided to use 2 amps but I changed it to 1 amp because I felt by using a low current I may not get a very good reading voltage and resistance. The Analysis: Explanation of results- As the length of wire increased, the current decreased. As the length of constantan wire increased, so did voltage. Resistance increased as the length of wire did. The longer the length of the wire, the higher the resistance because of the amps. The current flowing the p. d. across it providing the temperature is constant. V=Ii R or I=V/R or R=V/I From the graph which I have produces I conclude that the higher the length of the wire the higher the resistance. The thin wire in 1 amp tends to resist the movement of electrons init. We say that the wire has a certain resistance to the current. The greater the resistance the more voltage is needed to push the current through the wire. The resistance is calculated by Resistance-P. d across the wire/Current through the wire (1) I conclude that as the length of a wire doubles, the resistance also doubles (provided the thickness of the wire is kept constant0. I also conclude that as the cross-sectional area of the wire doubles; the resistance halves (provided the length of the wire stays constant. I conclude this because my graph shows that resistance is inversely proportional to 1 (thickness2) so the theories behind these conclusions are: As the length doubles the resistance doubles. Resistance is caused by electrons bumping into ions. If the length of the wire doubles, the electrons bump into the ions twice as much so the resistance will double. In my investigation I found out that as the length of the wire increased the resistance and voltage increased as well. The only thing that decreased was the current. I think this because the resistance and the voltage has no longer a distance to travel so more volts/amps are needed where as the current has a shorter distance to travel each time so as the same amount of amps are being used they are building up more. From the graph that I have done, I have found a pattern. This pattern draws me to a conclusion that the higher the length of the wire the higher the resistance. I had also stated this in my prediction, in the earlier stages of my experiment, so this means that my prediction was correct. The thin wire I (amps) a lamp tends to resist the movement of electrons in it we say that the wire has a certain amount of resistance to the current. The greater the resistance the more voltage is needed to push a current through the wire. The Ohms law calculates the resistance of a wire by: Resistance (R) = potential difference across the wire (V) Current through the wire (I) There is a resistance in a wire because the electrons bump in to each other in the nichrome wire. So the high resistance is because of the high length of the wire and because of the electrons bumping in the wire. My predictions match my results because I predicted that resistance would increase as the length of the wire increased and that is what happened. I worked it out by using my head. I started to think about this experiment then I thought that the current would have a longer distance as the length increased and that would make the resistance longer. I also found out that the resistance of one amp carries a current of one amp if there is a potential difference of one volt across it. Judging from my results, I can safely say that the majority of my prediction was right. The resistance did change in proportion to the length of wire. This is because as the length of wire increased, the electrons that made up the current had to travel through more of the fixed particles in the wire causing more collisions and therefore, a higher resistance. A thinner wire also means more resistance. Resistance is known to be inversely proportional to the cross- sectional area (diameter). I. e. if the diameter is increased, the resistance decreases. A wider wire means less chance of the free electrons having collisions into atoms and losing energy. Another point of my prediction was that as the length of wire doubles so does the resistance. This proved to be true. I can show this in my graph. The straight line indicates it. I can also see these in my results. E. g. 30cm=0. 95? and 40cm=1. 124 ?. The theories behind these conclusions are: As the length of the wire doubles, the resistance also two folds. Resistance is caused by electrons bumping in to ions. If the length of the wire doubles, the electrons bump into the ions twice as much so the resistance will double. I also want to state the fact that as the length of a wire doubles the resistance also doubles, however providing the thickness of the wire is kept constant. I conclude that, as the cross sectional area of the wire doubles the resistance halves providing the length of the wire stays constant. Evaluating my Evidence: I believe I carried out my investigation very well. I used all the equipment I was supposed to. I set the experiment correctly. Most of my results are accurate. I managed to get reading off both the volt meter and ammeter for each length five times and I used the correct safety precautions. I believe most of my results are accurate. Not all of the readings are correct as at the end the wire got very warm and gave faulty readings. After studying my results, I realise there is one anomalous result. It occurs in the voltage on the sixth voltage. It looks as if the volt meter had some interruptions such as the heat of the wire or the heat of the surrounding area. However this did not affect my predictions as I predicted the longer the wire the higher the resistance and this is what had happened but it had less resistance for that particular one than I had expected. It did not alter the increasing pattern in resistance. I believed that my investigation and the results are mainly accurate because my investigation was carried out very well. I believe that if I had to use my results as evidence I think they show that the longer the nichrome wire the more resistance and the shorter the less. I assume this because my graph shows at 10cm of nichrome wire there is 0. 592(ohms) and at 100cm of nichrome wire there is 2. 386(ohms) there is a difference of 1. 794(ohms) which proves longer the wire the more resistance. I can prove that my experiment was successful because of the graph I drew. It showed length of wire against resistance. If I had to further improve my investigation I would carry it out again and I would do it with a much longer piece of wire at a higher current. If I had to do this experiment again I will probably measure the wire every 5cm’s instead of 10cm’s to make sure it’s accurate and use a more accurate volt meter to get the best and accurate results. . I could also investigate how the diameter of a wire affects the resistance. An extra investigation I can carry out or perform to receive more proof and evidence would be to investigate and look into is the thickness of a wire and evaluate or match up with the length of the wire. Also I could examine if the specific metal materials or properties makes a change in the resistance. Show preview only The above preview is unformatted text This student written piece of work is one of many that can be found in our GCSE Electricity and Magnetism section.

KIA SORENTO OR DOGE JOURNEY Research Paper Example | Topics and Well Written Essays - 500 words

KIA SORENTO OR DOGE JOURNEY - Research Paper Example The other choice is a similar engine that is installed in the Journey: a 3.5 liter V6 integrated with a six-speed automatic transmission and delivers about 276 horsepower. Hence in terms of engine and transmission, Journey is slightly better than Sorento 2011. Dodge Journey is less noisy on the road when compared to Kia Sorento. Both the cars have lots of features that make them easy and comfortable to drive. Keyless open and start system, Bluetooth connections for communication during driving, USB audio jack and sound systems are present in both the cars. Journey 2011 has an 8.4 inch touch screen for radio and audio control in many of its models. Sorento 2011 on the other hand offers a voice activated navigation system and a backup camera in the rear of the car for a better view of the road. Sorento comes at a very economic price for all the features and comforts it can boast of. Kia has a better mileage with respect to fuel consumption when compared to Journey. It runs 21-29 miles per gallon as compared to about 16-26 mpg of Dodge Journey. It also has plenty of safety features like antilock disc brakes, active front head restraints, stability control, front seat side airbags and an special internal system that enhances the traction on icy and inclined roads.

AT&T, Verizon, Sprint Research Paper Example | Topics and Well Written Essays - 1500 words

AT&T, Verizon, Sprint - Research Paper Example Similarly, the operators’ privacy policy remains of enormous importance and is significant in swaying preference based on how secure a client feels. While national carriers remain committed to privacy protection, the problem persists in modern times owing to clauses that seem to preserve corporate interests at the expense of the client. Focusing on AT&T, Verizon, and Sprint, this paper explores similarities and differences privacy policies with the aim of establishing areas that require improvement. Background and Visions With its origins linked to the Bell Telephone Company that was founded by Graham Bell, AT&T commands a large market share across its subsidiary companies that offer a wide range of products and services. The company boosts a large following of more than 100 million subscribers of broad range wireless voice and data services. This is facilitated by the company’s capacity and coverage that goes beyond the US and into more than 200 countries. For periods, AT&T have established consistency in innovative, reliable, and high quality products and services guided by the mission to connect people with their world. The company’s mission seeks to establish coverage in accordance to basic and daily routines of their target population (AT&T, n.d.). In this manner, AT&T seeks perfection in the provision of services by creating new solutions to cover personal and business needs, which drives innovation in the industry. An amalgamation between Bell Atlantic and GTE saw the emergence of Verizon, which has grown to become a major competitor in the provision of wired and wireless communication services. Initially, Bell Atlantic was founded as a result of the AT&T breakup in the anti-trust judgment, which saw the Bell acquire seven of Bell Operating Companies. As such, this contributed to the rise of the company to the largely competitive communications industry in the US. Verizon specializes in the provision of wire line communication servic es and boosts of a wide coverage of high-speed optical fibre line, which serves facilitate various products. This has seen the company establish partnerships with various broadcast companies to deliver a wide variety of digital entertainment including pay-tv services. This way, Verizon is able to fulfil the basic of its intentions as stipulated in the company’s mission, which is to allow communication among people and businesses. The company also indicates a great deal of commitment to its clientele, staff, and investors that works towards creating a respected brand in communication. With its base in Kansas City, Sprint Corporation serves millions of businesses and residential customers in more than 70 countries. The company is recognized for the development and deployment of state-of-the-art network technologies associated with America’s first nationwide fiber-optic network. It is through this that clients are served in various capacities including network-based voice , video, and data services. Sprint’s mission aims at the provision of enriching and productive experience to their customers with regard to communication solutions. This way, the company hopes to provide the best client service, products, and rates that will constitute the evaluation standards in the world. Similarities in Private Policies A privacy policy describes a set of regulations that govern the collection, use, and dissemination of a client’

Starting and Developing a New Venture Essay Example | Topics and Well Written Essays - 2000 words - 1

Starting and Developing a New Venture - Essay Example In the case of Haji he started Easy jet airliners after leaving Stelmar Tankers, his own shipping company by persuading Lucas to lend him ?5 million. He started Easy jet a low cost budget airline using two rented 737s and ?29 one-way fares to Glasgow. By starting Easy jet Haji was not bowing to the pressures of risk but took an imperative measure even though he had been charged earlier with counts of poor maintenance of his vessels and manslaughter. Moreover he started Easy jet by borrowing money. It is a known fact that borrowed money attracts interest and the principal money has to be paid and therefore it becomes, quite impossible to get promising returns in the first years of business. In his autobiography Richard Branson reckons that his passion in doing business is motivated by setting huge goals that are apparently unachievable, and staying focused to rise above them. This shows that Branson was aware of the risks involved in a huge venture when he set up Virgin Atlantics. Bes ides in 1993, Branson took the greatest risk by venturing into the railway business. This project was very costly and most people though he would not make it. It goes without taking that Branson and Haji took a partial path when it came to risks and only took the initiative of such ventures when they deemed them worthwhile in the long run. LOCUS OF CONTROL The locus of control is the power in the principle that one can formulate and implement things. Most entrepreneurs have a high locus but in most cases they are poor in delegating duties. They are upbeat when it comes to venturing into business. They tend to be more practical and positive about their business ventures. In 1993, Branson took what most people thought was a very risky:... Curiosity and creativity is the quintessence of entrepreneurism. New products, new solutions and new ways are the core of creativity and in general entrepreneurism. It is about willing to think of all possibilities and opening one’s mind to creative things through being inquisitive of what is going on in the globe and quite often generating a gimmick of stuff that suggests one’s ability to create new products that other people are afraid of thinking. Branson has been termed as one of the new generation of the creative world. He took products that were already in existence and made them look original. He has revolutionized the airline business by integrating it with other business ventures like the Virgin Fuels and Space tourism. Virgin Fuels was designed to respond to global warming and exploit the insistence spikes in fuel expenditures by offering a revolutionary, less costly fuel for machines and, in the near future, aircraft fuel. Branson stated that he was formerly a global skeptic and his decision was influenced by Al Gore.