Why the US used the atomic bomb against Japan

Introduction The Second World War represents the worst war that has ever been fought on the face on the earth. The war involved majority of the world’s nations and culminated into the death of over 50 million people. During the war, major world powers and resources were thrown to the war (Allen and Polmar 1995).Advertising We will write a custom essay sample on Why the US used the atomic bomb against Japan? specifically for you for only $16.05 $11/page Learn More Towards the end of the war, the United States dropped two atomic bombs on Japan. This paper seeks to describe the reasons why the US used the atomic bomb against Japan. There are two main reasons that prompted the United States to use the atomic bomb against Japan; the refusal to surrender by Japan and the need for the US to assert itself. Japan’s refusal to surrender Japan was persistently stubborn during the Second World War and this can be regarded as the main reason why the US used the atomic bomb against it. The government of Japan refused to surrender and pull its troops back even after its forces had been significantly weakened. By August 1945 Japan was on its knees as most if its industrial plants, air bases and harbors were destroyed. The country was also experiencing a severe short supply of food and raw materials and yet it continued to cling on most of the contested Islands. The US had successfully tested the atomic bomb (fat boy) in July 1945, and together with the other members of the allied forces, issued the Potsdam Declaration on 26th July that called on the Government of Japan to proclaim the unconditional surrender of all of its armed forces. â€Å"The alternative was a prompt and utter destruction† (Harrison 1987). On July 30th Japan gave its response- a total rejection of the ultimatum and at about the same time, began negotiations with the Soviet Union in hope of better terms. As a result, the first atomic bomb was dropped on Hiro shima in August 1945 followed by further calls for Japan to accept the Potsdam Declaration or face further ruin (Heina and Selden 1997). The Government of Japan still hesitated and on August 9th the second atomic bomb was dropped on Nagasaki. After further quibbling, Japan finally agreed to surrender on August 14. The need for the US to assert it’s might The use of the atomic bomb against Japan was widely discouraged by various advisers of President Truman due to the Bomb’s ability to cause mass destruction of civilian life. After Japan’s refusal to heed the calls stipulated in the Potsdam Declaration, a section of Truman’s advisers encouraged the demonstration of the power of the atomic bomb on a desert or barren Island to encourage Japan to surrender (Heina and Selden 1997).Advertising Looking for essay on history? Let's see if we can help you! Get your first paper with 15% OFF Learn More Truman disagreed and insisted on the use of the Bom b against Japan. Many analysts have interpreted this as a move by the US to assert it and influence the course of war. This was particularly intended to display superiority against the backdrop of a growing disdain between the allied forces and the Soviet Union. This can be justified by the cold war that followed the Second World War. Conclusion This paper sought to describe the reasons why the United States used the atomic bomb against Japan. It has been established that the US used the atomic bomb to basically end Japan’s stubbornness and end the world, and to further assert its power against the backdrop of a looming confrontation with the Soviet Union. Bibliography Allen, Thomas, and Norman Polmar. Code-Name Downfall. New York. New York: Simon Schuster, 1995. Harrison, Scott. History in the Making: World conflicts in the 20th century. London: Macmillan Education, 1987. Heina, Laura, and Mark Selden. Living with the Bomb: American and Japanese Cultural Conflicts in the Nu clear Age. New York: E. Sharpe, 1997. This essay on Why the US used the atomic bomb against Japan? was written and submitted by user Lia Jordan to help you with your own studies. You are free to use it for research and reference purposes in order to write your own paper; however, you must cite it accordingly. You can donate your paper here.

How I Got my Indie Novel Into the Nations Largest BrickMortar Store

How I Got my Indie Novel Into the Nations Largest BrickMortar Store "How I Got my Indie Novel Into the Country's Largest Brick-and-Mortar Chain" - By Carol Cooper Carol Cooper is a journalist, author, and doctor. She writes for The Sun newspaper, broadcasts on TV and radio, and has a string of non-fiction books to her name including an award-winning textbook of medicine. In this post, Carol reveals how she got her latest novel, Hampstead Fever, into Britain’s largest chain of booksellers. For the last few weeks, I’ve bragged to anyone who’ll listen that my self-published novel, Hampstead Fever, is in a prestigious front-of-store promotion in WH Smith travel bookstores. And no wonder I’m proud. Not only am I distributing my novel as an ebook - readers can now get it at over 700 airports and train stations around the UK.  WH Smith, after all, is the go-to place to grab a good read for a journey or holiday.I don’t have a sure-fire recipe for other indie authors to follow, but I can certainly explain what worked for me. Read how @DrCarolCooper got her latest novel into UK's largest brick-and-mortar chain 1. Get out and listen to peopleI owe a lot to the London Book Fair, circa 2015. That’s where I came across WH Smith Travel buyer Matt Bates. He spoke at Author HQ, a part of the fair dedicated to writers. He was charming, knowledgeable and enthusiastic and he wasn’t full of himself, which, as I recall, one or two other speakers at the fair were.I said a bland ‘Hello’ to Matt at the end of his talk. I don’t remember my exact words, but I said nothing about my writing. Hampstead Fever  at the WH Smith at London Gatwick AirportNo harm in trying, especially as by then my book was in many bookstores including Waterstones, Heffers Cambridge, and a sizeable number of independent bookshops, and had featured in local press and radio.   I sent Matt a brief email, attaching that eye-catching cover.Matt asked to see a copy of the book. There followed a longish silence. Then he replied, proposing a promo in over thirty of WH Smith’s travel bookstores as part of a buy one, get one half-price offer.I needed to do nothing more, except talk to Clays about a reprint and arrange the discount and return terms that WH Smith requires.I’m certain the stunning cover did much of the work for me. As for the content, people have been kind enough to say that Hampstead Fever captures multicultural urban life. It’s an easy read and makes people laugh, but it also covers some weightier issues.To other self-publishing authors wanting to get into booksho ps, my single best piece of advice is this: aim for a quality product that booksellers will love to have in their stores. "Aim for a quality product that booksellers will love to feature." @DrCarolCooper In your chain of priorities, how important is it to you to get your book in stores? If you have any thoughts, comments or questions for Carol Cooper, leave them in the comments below. Find out more about the author on her website or by following her on Twitter.

Access to Law - Smart Custom Writing Samples

Access to Law - Smart Custom Writing Functions of Administrative Law and its role in Public AdministrationAdministrative law is the branch of law that governs the activities of administrative agencies of government that are involved in the daily functions of the states activities. Some of these government agency actions include making rules, arbitration, or the enforcement of a specific regulatory plan. Generally, administrative law is a branch of public law. The administrative law integrates several different areas of law of which some of them are regulations and procedures of government bodies and agencies, administrative rules, enforcement of powers of government agency authority, and restriction of access to government information. The administrative law gives special importance to the powers vested in administrative agencies, the legal relationships of such agencies, the public at large and to other government agencies as well, and the substantive rules made by these agencies too. It enshrines the laws and legal pr inciples that govern the regulation of government agencies and administration whose powers are delegated by Congress. These agencies may be state or Federal agencies, and administrative law therefore comes in to act as a representative for the executive. Overall, the administrative agencies are created for the purpose of protecting the public interest rather than vindicating private rights. The creation of state and Federal agencies under administrative law goes back to the 1900s when the Food and Drugs Act was signed into law leading to the subsequent formation of the Food and Drugs Administration, also known as the FDA late in the 1930s. The creation of the Environmental Protection Agency, sometimes commonly referred to as The U.S. Environmental Protection Agency, EPA or USEPA, came into being in the late 1970s. These agencies are under the jurisdiction of the Federal government and they are tasked with the respective responsibilities governed by the administrative law. However, these Federal agencies are not autonomous of the U.S. Congress, but are rather governed by the U.S. Congress, which is the overall law-making body in the land. Any by-laws made by these Federal agencies that are inconsistent with the U.S. constitution are deemed as going against the law; hence, they are revised to be within the law. The FDA, created in the early thirties, came about because of the pressure mounted by consumer protection organizations, journalists and other federal regulators that pushed for a stronger regulatory authority. They went ahead to publish a list of harmful products that had been passed as fit under the 1906 law. This law extensively increased the federal regulatory authority on drugs and food substances. The FDA also enforces other laws that are concerned with health and sanitation, and among these laws are the Public Health Act, the Federal Anti-tampering Act, and the Controlled Substances Act among others. The Law mandates a pre-market review of all new drugs’ safety in addition to banning all ‘unsafe’ products (Karki, 2005). It also authorizes factory inspections and extended enforcement powers in order to set best regulatory standards for foods and cosmetics in order to ensure the safety of the citizens. The major areas that FDA is involved in include new drugs , advertising and promotion of prescription drugs, generic and over-the-counter drugs, vaccines, blood tissue products and biotechnology, cosmetics, radiation-emitting devices, and veterinary products (Hilts, 2003). The Environmental Protection Agency (EPA) is Federal Government agency mandated with the responsibility of protecting human health and the environment alike. It is directly under the authority of the White House. This is accomplished by enforcing written regulations on the environmental conservation policies based n the Congress-passed laws. Some of the tasks that it is charged with are prevention and detection of environmental degradation actions, educating the public on environmental enforcement, and setting and monitoring the pollution standards, be they air or water pollution arising from the dumping of harmful waste materials and chemicals. Some of the major areas that EPA is involved in include pesticide control. Here, the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) is taken into account. Other areas are promoting the use of safer detergents that would minimize pollution effects, improving the air quality, reduction of oil pollution, encouraging water efficiency and ensuring that drinking water is safe for consumption by the citizens. Global warming and greenhouse gas emissions are also dealt with by EPA. As detailed above, these agencies appear to be very helpful in the administration of laws and Acts as set by the Congress. Although they do not operate independently of the Congress, they operate ‘on behalf’ of the Congress by enforcing the set laws and regulations at the grassroots level. These agencies are most effective because they come into direct contact with the citizens and the products, and hence they are in a very good position to enforce the laws accordingly. In this century where there is a great revolution in the manufacturing industry, the introduction of new technology and improvement of lifestyles, there is a great need for the checks and balances to be enforced, and no better way than through these federal and state agencies. Hence these agencies come in and play a vital role in the enforcing of these checks and balances according to the U.S. laws enacted by congress. This way, the people are better protected from any potential harmful products and the e nvironment is protected from degradation by encouragement of proper waste disposal and management. As a conclusion, it can be said that these federal agencies are very crucial and necessary in this century where development is on the increase, and they serve to ensure people make the right choices by being given the right options.      References Hilts, P. J. (2003). Protecting America's Health: The FDA, Business, and One Hundred Years of Regulation. New York: Alfred E. Knopf. Karki, L. (2005). Review of FDA Law Related to Pharmaceuticals: The Hatch-Waxman Act, Regulatory Amendments and Implications for Drug Patent Enforcement. Journal of the Patent Trademark Office Society 87: 602–620.

Organ Transplant Research Paper Example | Topics and Well Written Essays - 1000 words

Organ Transplant - Research Paper Example In the U.S alone over 28,000 patients under transplant surgeries and over half of these surgeries are kidneys transplants while a quarter are liver transplants. Process of Organ Transplantation Organ transplantation calls for therapeutic usage of organs to replace a non-functional organ. However, the medical process is quite complex since organ transplantation comes with its own bag of complications and challenges. Keeping aside the legal issues and paperwork involved, the first step i.e. procurement of a healthy donor is a mammoth task since it care should be taken that the blood types of the recipient as well as the donor matches since â€Å"fate of a graft depends not only on excellent surgery with avoidance of damage to the organ in the process, but, as indicated above, the degree of HLA matching of donor and recipient is crucial in any approach to tolerance† (Calne, 2005, p1979). One a suitable candidate is found the healthy organ is harvested carefully and the damaged or gan in the recipient’s body is surgically replaced with the new healthy organ. Post-surgery, the newly replaced organ is kept under observation to detect rejection by the recipient’s body. Immunosuppressant drugs are administered to help the body accept the new organ and gradually integrate it in the patient’s body as its own. ... Such phenomena lead to organ rejection or blood transfusion reaction. Heavy immunosuppressant drugs are therefore administered after a transplant surgery. Therefore, it is necessary to match the donor and receiver’s blood so that the organ acceptation by the receiver’s body is smoother. The rejection mechanism of allograft kidney transplantation was studies and it was seen that â€Å"the most common form of acute allograft rejection is initiated when donor alloantigens are presented to the T lymphocytes of the recipient by antigen-presenting cell (APC’s) â€Å"(Schwartz, 2010, p1453). A new study shows that Jagged2 plays an important role in accelerating heart transplants or cardiac tissue grafts since its signaling affects the acceptation rate of graft by regulating interleukin-6 (Riella et al, 2013, 1449). Ethics and Importance of Organ Donation Becoming a donor is a tough choice for many. There are 2 types of donor-living donor and deceased donor. Organ dona tion is an important choice that can save a lot of lives however, organ donation, in many parts of the world, has rapidly emerged into a trade. For example, poor people sell one of their kidneys to the rich and since The risk involved in nephrectomy is not in itself high, and most people regard it as acceptable for living related donors (Radcliffe, 1998, p1951). However some people find the procedure too invasive and thereby refuse the whole idea of organ transplantation (NHMRC,1997,P12). Brain death and organ donation Organs are procured from cadavers however brain dead individuals provide fresher organs for harvest. This, stirs up an ethical issue since complete loss of brain function needs to

Interactions Between Policymakers And Scientists Essay

Interactions Between Policymakers And Scientists - Essay Example The understanding of the political leaders often originates from those whom they interact with and their environment. Hence, knowledge due to scientist interacting with policymakers and politicians contribute significantly in trying to find the solutions to the global warming while formulating regulations. Global warming brings together the policy makers and scientists who try to determine causes and possible solution. The continuous exchange of ideas between scientists and policymakers across the globe shows the urgency of the matter. Moreover, these interactions between scientists and policymakers define the types of regulations in place in trying to control climate change. Governments use many ways in an attempt to control climate change based on the scientific evidence. However, there are opposing groups of people that view climate change as a natural factor that does not require human intervention (Humphreys, Blowers, James & Jehlicka, p. 17). This contradicting opinions and uncertainty from science play a significant role in the formation of climate change policies. In the scientific context, uncertainty involves lack of understanding or measurement of something. In the past, scientists had limited access to policymakers that deterred their interaction and exchange of ideas. The scientist had the knowledge of possible future impacts if people take no actions to limit the emission of global warming. However, the passing scientific knowledge to politicians proved challenging until the introduction of scientists in the government department. Besides, the formation of IPCC involving both policymakers and scientists increased their interaction (Humphreys, Blowers, James & Jehlicka, p. 75). There were also limitations in passing the information between the policymakers and scientists due to the language that scientist used in the description.

Radio Communication System for a Motorcycle

Radio Communication System for a Motorcycle Part 1: Introduction 1.1 BACKGROUND INVENTION This invention relates to a radio communication system for a motorcycle wherein a radio communication circuits is attached on a helmet and performs radio communication with another radio communication circuits attached on another helmet. This helmet provides a wireless communication between two helmets for intercommunication or entertainment system. It is also included with solar energy system which will recharge the battery so that it will be constantly applicable. That is why we call it â€Å"Smart Helmet†. As we know, there a number of different types of helmets that is use across many different type of industries and environment. However, they all are use in form of protective gear. For example, wearing hard hats is standard practice when working in construction site, as well as when operating heavy industrial equipment, etc. Sports athletes, such as baseball and football players, also wear helmets for protection and it is one of the most critical pieces of equipment for a professional race car driver. Helmets are also used in the military services and one type of helmet that is one of the more commonly seen is a motorcycle rider helmet. Motorcycle riding helmets are very sophisticated and specialized for the activity. In recent years, helmet wearers have encountered a wide array of methods by which audio content can be delivered to and transmitted from a helmet, such as a motorcycle or racing car helmet. Current systems for listening to music while riding a motorcycle generally involve a factory installed or aftermarket radio and speaker system mounted on the motorcycle. This is due to hard communication between each other within a motorcycle because of interruption in wind and engine noise. Thus, we invent a communication system ability to communicate with each other. The speaker system must be powerful enough to overcome the road, engine and wind noise to allow a rider to listen to the music when the motorcycle is at highway speeds. In this system, the rider usually has a wire connecting the helmet to a radio mounted on the helmet and the speakers. These systems may also include a microphone integrated into the helmet to allow riders to communicate each other. 1.2 PROJECT OBJECTIVES There are several main objectives for this project: To understands the basic concept of two way communication and solar energy system. To understands Push-to-Talk technology system To understands how solar energy system operates To enhance the ability of the helmet To perform circuit operation To gain knowledge on circuit designing and structure 1.3 PROJECT GOALS The Overall Project Goal was to enhance the quality and effectiveness of LSC grantees services to clients by providing training and technical assistance and serving as an information clearinghouse on technology innovations for the legal services community. There were two specific goals as identified in the Evaluation Framework approved by LSC: Provide training, technical assistance and informational resources that increase the understanding legal services program directors, managers and technology staff have about the ways the use of available technologies can improve services to clients. Publicize, promote and provide resource materials about successful local/national technology projects to foster the replication of technology innovations throughout the legal services community. 1.4 PROJECT SCOPE General Project Scope: The project will include rehabilitation or replacement of SN 050-0088. A bridge condition report (BCR), hydraulic report, type size and location (TSL) study, location drainage study and project report will be required and should follow the applicable Department manuals and guidelines. Intersection geometrics will be studied as needed in accordance with Department policies. Geotechnical testing and analysis will be required for development of type size and location drawings for the structure. The scope of work shall include all items necessary to provide an approved project report, bridge condition report, hydraulic report, location drainage study and type size and location drawings as needed. 1) Data Collection: Review data supplied by the district (old plans, pictures, traffic counts, survey data, crash data, right-of-way information, road-way data, and examples). Field check project, and review data from other sources. 2) Field Survey: A topographical survey will be required. Horizontal and vertical control will be provided by the District for the existing alignment. Survey of the existing structure shall include all necessary detail to meet Department policy and to support the proposed scope of construction. The survey shall extend down side roads and beyond existing right of way in order to accommodate anticipated proposed construction. Roadway survey shall extend at least 50 beyond the existing right of way and include any necessary drainage features. Survey shall extend 600 down intersecting roads and cross sections will be taken every 50 and at all entrances and special features. Bridge and hydraulic surveys will be required under this contract. Hydraulic surveys will follow Department policies. 3) Right of Way: The Department will draft existing right of way (station and offsets) on to the topography including property lines and owner identification. The district will provide names, addresses, and tax parcel I.D. numbers for all nearby property owners. IDOT will also mail the property owner letters regarding easements or proposed right of way. No right of way plats or plans will be included in this contract. The consultant will determine construction limits and proposed right of way and easement needs. The consultant will provide construction limits and all proposed ROW or easements on the plan and profile sheets. 4) Drafting: The consultant will plot existing and proposed plan and profile sheets, proposed drainage sheets, existing and proposed cross sections. Development of typical sections, preliminary staging details, proposed construction limits, proposed right of way and exhibits for included studies and reports will also be necessary along with any other work to complete the phase I study and other reports/studies. The consultant shall send the district one full size copy of the plan sheets for utility mark-ups. The district will make copies and send them to the utility companies. The consultant will then incorporate any utility information onto the plan sheets. 5) Alternate Design Studies: Alternatives will be studied to provide bicycle and pedestrian accommodations as part of structure rehabilitation or replacement. The preferred alternative will be incorporated into the planning and design of the project. 6) Location Drainage Studies: See the IDOT Drainage manual section 2-100 thru 2-500 for required format and analysis. Work includes studying the existing drainage patterns including structures, ditches, outlets, etc., developing drainage areas, determining discharges; developing a required system, comparing existing and proposed, developing alternates, determining impacts, developing recommendations, determination of culvert extensions, preliminary inlet spacing, capacity calculations; in-line storm water detention design; ditch design, minor culvert analysis, sizing storm sewer, and everything else needed to complete a drainage report for the project. The drainage study should address flooding records within the project as appropriate. 7) Hydraulic Report and Bridge Condition Report: Work shall include all items necessary to complete a hydraulic report and bridge condition report (BCR) for the structure. This includes, but is not limited to, hydraulic survey, bridge inspection/load rating, hydraulic analysis, staging feasibility determination and cost comparison. 8) Type Size Location Study: TSL studies will meet the requirements of the District and the Bureau of Bridges and Structures. Geotechnical testing and analysis will be necessary for development of the TSL. A preliminary TSL shall be submitted to the District for review before transmittal to the Bridge Office. 9) Intersection Design Studies: Two intersections are anticipated to be included in the scope of work (Dee Bennet Road and Starved Rock Road). Intersection design studies may be required at these locations. Traffic counts will determine the need for an IDS at each location. Typically 3 submittals are required draft, pre-final and final. IDS work includes signal warrant analysis at all locations, combination lighting, and capacity analysis at all locations, as well as all other requirements set forth in the Bureau of Design and Environment Manual. Traffic data will be provided by the district. 10) Preliminary Report: Work includes written report, calculating quantities, cost estimates, crash analysis, approval forms, structure fact sheet, design exception forms (if needed), roadway design, exhibits, photos, maps, typical sections, plan and profiles, IDS plans, environmental exhibits, existing and proposed vertical and horizontal data, design criteria checklist, tree schedule, culvert rehabilitation diagram, traffic management analysis, preliminary erosion control plan, and any other project related documents to complete the project report. The district will provide the following for insertion into the report if needed: Crash data and exhibits; coordination meeting minutes; hazardous mailbox support surveys; bridge condition report approval; letters to property owners and other local officials; environmental studies, analysis, and reports; and pavement design if needed. 11) Public Meetings (2 planned): Consultant will prepare exhibits and handouts, locate and reserve the meeting room and attend meetings such as the dry run, local official meeting, and the public meeting. Two public meetings (open house format) are anticipated, the first to evaluate alternatives and the second after the EA and all IDSs are completed. The first will be considered an informational meeting and the second a public hearing. Comments from each meeting may need to be incorporated into the project. Exhibits needed for public hearing: Location map, Crash maps, Purpose and Need, Summary of Key Environmental impacts, Full size set of plan and profile drawings including cross sections, approved IDSs , two sets of aerial exhibits / color drawings, board mounted proposed typical sections, draft project report, and a copy of the EA report that is approved by the FHWA for public review. The district will send letters to local officials, prepare minutes for local official meetings, and send response letters to citizens or groups as needed. The EA, after approval by the FHWA for public hearing, will be made available at the public hearing and for a minimum of 15 days in advance of the public hearing. The published hearing notice will announce the availability of the EA and where it may be obtained or reviewed. Public meeting exhibits are similar. The public meeting does not require environmental documents or approved IDSs. The consultant will forward display advertisements for each public meeting/hearing to two different newspapers chosen by the District and pay for these advertisements. This will be a direct cost. Rental of a meeting room will also be a direct cost. 12) Handling Traffic: Stage construction, detours and combinations of the two will be considered for this project. The consultant will identify construction methods and sequences which will minimize motorists inconvenience and incorporate this information into the Traffic Management Analysis for the project. The work will be limited to a conceptual plan only since detailed plans will be done in Phase II. A Queuing and Delay Analysis will be performed since IL 178 is considered to be â€Å"approaching significance† by Safety Policy 3-07. The consultant will provide pertinent data and District 3 will perform the analysis. 13) Progress meetings: The district estimates that 3 progress meetings with IDOT and 12 consultant in-house meeting will be required. Outside of typical administration. 14) Final Report: Compilation of the final report will be based on information from public meetings, comments from District circulation and other input which may impact the project. This also includes hours for revising preliminary report, printing, assembling, and binding the final report. 15) Environment: Anticipated Categorical Exclusion Follow Department policies This work includes examination of Environmental Survey Request (ESR) results to determine impacts and determine appropriate environmental documentation. The consultant will provide excavation depths and quantities for areas identified for special waste and will catalog trees impacts and make recommendations for tree replacement locations. IDOT will develop and submit ESR to Central Office for processing. If it is determined that an Environmental Assessment (EA) is the appropriate form of documentation the extra work will be added by supplemental agreement. Impacts to parks or Historic properties will be included in a supplement (if required). The district will prepare any Wetland Impact Evaluation forms (if required). 16) Administration: Project administration including payroll, billing and filing. This also includes project administration by sub-consultants. 17) Quality Control/Quality Assurance: This is a required line item for both labor hours and billing. This item is to include QC/QA hours of the prime consultant as well as any sub-consultant. 1.5 SYSTEM OPERATION 1.6 PUSH-TO-TALK INTRODUCTION Push-to-talk (PTT), also known as Press-to-Transmit, is a method of conversing on half-duplex communication lines, including two-way radio, using a momentary button to switch from voice reception mode to transmit mode and communication can only travel in one direction at any given moment. However, it is not limited in distance as with normal walkie-talkies, as the conversation is carried across the mobile network. A normal cell phone call is full-duplex, meaning both parties can hear each other at the same time. To control which person can speak and be heard, PTT requires the person speaking to press a button while talking and then release it when they are done. The listener then presses their button to respond. This way the system knows which direction the signal should be traveling in. Most PTT systems allow group calling, meaning one person can speak to everyone in their assigned or current group at once, just by pressing a PTT key. Other key features of the service mean that users immediately recognize it as different from normal voice. †¢ group calls are possible as well as one-to-one calls (but still only one person can talk at a time) †¢ presence information is normally associated with this service, so users can see on their phone screen whether other people are logged on to the PTT service and will therefore be available if called †¢ PTT voice services are typically priced below normal mobile phone calls (but obviously this is a marketing issue) †¢ call hold times are typically much shorter the walkie-talkie style of speech lends itself to the short, snappy transfer of specific information, rather than normal lengthier conversations †¢ the always-on nature of data networks makes for near instant call setup times that make it very easy to use. 1.7 SOLAR ENERGY SYSTEM INTRODUCTION In todays climate of growing energy needs and increasing environmental concern, alternatives to the use of non-renewable and polluting fossil fuels have to be investigated. One such alternative is solar energy. Solar energy is quite simply the energy produced directly by the sun and collected elsewhere, normally the Earth. The sun creates its energy through a thermonuclear process that converts about 650,000,000 tons of hydrogen to helium every second. The process creates heat and electromagnetic radiation. The heat remains in the sun and is instrumental in maintaining the thermonuclear reaction. The electromagnetic radiation (including visible light, infra-red light, and ultra-violet radiation) streams out into space in all directions. Only a very small fraction of the total radiation produced reaches the Earth. The radiation that does reach the Earth is the indirect source of nearly every type of energy used today. The exceptions are geothermal energy, and nuclear fission and fusion. Even fossil fuels owe their origins to the sun; they were once living plants and animals whose life was dependent upon the sun. Much of the worlds required energy can be supplied directly by solar power. More still can be provided indirectly. The practicality of doing so will be examined, as well as the benefits and drawbacks. In addition, the uses solar energy is currently applied to will be noted.

Differences between bacteria, viruses, fungi and parasites. Essay

Bacteria: These are tiny microorganisms, they cannot be seen with the naked eye. They exist on virtually every living thing or object in the environment i.e. dirt, water, caves, trees, dead animals, and within everybody living on earth. Its nutrition is from its surroundings. We carry bacteria in the body, mainly in the intestines, on the genitalia or on the skin. Bacteria can be good or bad. It can help our immune system but there are bad bacteria which make you become ill. Meningitis is a bacterial infection, this can be life threating to a young baby and is most common in young children. It is an infection of the membranes covering the brain and/or spinal cord, this is a reason it can be life-threatening. MRSA is another big bacteria illness, this commonly affect hospitals and is due to lack of hygiene. Food poisoning is a common cause of illness caused by bacteria. This is because bacteria lives on food. If cooked and food has not reached a high enough temperature to kill off bac teria then it can cause the bacteria to rapidly grow and cause sickness to a person. The types of food poisoning are; salmonella, E. coli, norovirus, campylobacter, listeria, clostridium perfringens. These are also linked with viruses too. Also most sexual transmitted diseases are a bacterial infection i.e. syphilis, gonorrhea. Also Lyme disease, this is spread by the bite of a deer ticks most common around wooded, rural areas. If untreated it causes an arthritis-like condition that can last for months. Viruses: This is a disease producing agents which are far smaller than bacteria. They are enclosed in a protein coating which makes them more difficult to destroy. These replicate only inside the living cells of organisms. They can infect all types of life forms i.e. plants, animals, and bacteria. The most common virus is the flu, it’s a contagious infection (it spreads from one person to the next). Foot-and-mouth is a virus disease which is caused within an animal. Plant viruses such as mild mottle virus eat away at the flesh of i.e. peppers. This can cause harm onto animals and people if they consume the food. Some viruses can replicate within archaea, these are double stranded DNA viruses with unusual shapes. Chicken pox is another virus illness, this affects normally in children. Fungi: This comes from the plant kingdom but are quite different from green plants. The basic  unit of a fungus is a hypha which is a hollow tube. This spreads out over and into the food material making a visible mesh. Some mass together to create toadstools, releasing spores into the environment. Some fungi can be quite dangerous causing hallucinations but some can even result in death. There are 1.5 million different types of fungi in the world. Out of that only 300 are known to cause illness. Aspergillosis – this normally occurs with a person who has a lung disease or a weakened immune system. Dermatophytes – this in fungal infection to the skin and nail i.e. athletes foot. Fungal keratitis- this is the inflammation of the cornea (the clear front part of the eye). Parasites: A parasite lives in a close relationship with another organism (host) this causes harm. It is dependent on the host for its life functions e.g. viruses are common parasites. It lives, grows and multiplies off the host. A hookworm is a common type of parasite, pets can get thes e and transfer then onto humans. Hookworms attach in the lining of the small intestine, causing disease and malnutrition as well they eat the nutrition and prevent the host from getting them. Parasites can give off toxins that make the host sick resulting in an infection. Malaria is one of the deadliest parasite diseases, this is why when flying abroad you must ensure all injections against parasites are up-to-date. So there are three types of organisms where parasitic infects; protozoa, helminths and ectoparasites. Protozoa are singled celled that live and multiply within humans. An infection caused by this is giardiasis, this is caused from drinking water infected with protozoa. Helminths are multi-celled organisms that can live alone or in humans and animals. These are commonly known as flatworms, tapeworms, ringworms, roundworms. Ectoparasites are multi-celled organisms that live or feed of the skin of humans such as mosquitos, fleas, ticks and mites. When we have an invasion of the body of microorganisms which are not normally present, we call it an infection. This is when germs such as parasites, microbes etc. attack our body and cause harm (disease) or even death unto a host (organism) body. An infection may remain localised in the body (stay in one place) or it may spread through the blood or lymphatic vessels to become systemic (body wide). So something which is linked with ‘infection’ is something called ‘colonisation’. This is the process in the biology by which a microorganism will spread to new areas/part of the body. Colonisation is the development of a bacterial infection on/in an  individual. The individual becomes a carrier to the infection but may have no signs or symptoms of illness. They do have the potential to infect others. Systemic infections affect not just one part but all of the body, examples of this are flu/HIV. And localised infections are limited to one area ear/eye infection. Identifying poor practise that could lead to infection are fairly simple and basic. Ensuring that you wear clean clothes every day, washing hands very regularly, wearing all correct PPE. Incorrect storing or cooking of foods will lead to infection so you must ensure that things are stored correctly i.e. fresh meat should not be kept on top shelf of the fridge above fruit and veg, contamination of blood could occur. 2.1 What conditions are needed for the effect of growth on micro-organisms? Food is the main source, organisms need food to survive, foods with high protein such as fish and poultry. Warmth is another key factor, anything between 20-40 degrees will really encourage microorganisms to develop and grow, and moisture enables the multiplying process further. Air (usually) although some microorganisms do not need the use of air to spread. So all of these factors seems very every day and very easy for an organism to grow very quickly although a single M.O becomes 2 every 20 minut es. This means the process can take fairly long so regularly cleaning surfaces and storing food correctly will decrease the contamination. 2.2 Infectious organisms that can enter the body are many. They can potentially cause harm to the body, they enter through different openings in the human body. As well as this they can be transferred from mother to baby during pregnancy. The respiratory system – the infectious organisms that cause communicable diseases such as common cold, flu, and pneumonia. They enter through the nose and then begin to multiple, if not treated right away they can cause other additional problems. The digestive system – with this the organisms are found in food i.e. food poisoning. If food is not correctly cooked at a high enough temperature to enable the bacteria to be killed off. The organisms enter the digestive system and can make you sick when the body is trying to digest the tainted food. Some food poisoning can be fatal if they’re left untreated. Penetrating through the skin – infections organisms that can cause sickness  like tetanus and hepatitis C enter the body through the skin. Once entered they start to multiply and can cause more serious problems if untreated. Sexual transmission – some infections such as sexually-transmitted diseases like HIV and gonorrhoea, are transmitted through body fluids such as semen. Once it has entered the body the infection multiplies and can cause complications if it’s not tre ated. Contact with animals – if you come in contact with an animal that is infected with i.e. rabies the virus can enter your body through the skin. Transferring from mother to child – a woman who is pregnant can transfer lots of kinds of infections such as rubella, German measles, this can be done without realising, and vaccinations for babies once born must be given to prevent the infections. Infections are a significant problem which humans have to face on a daily basis. They can affect the body in some of the most unpleasant ways. They have multitude causes, some are completely uncontrollable. Some people can have an infection and not even know (asymptomatic infections). There are actually five types of microorganisms called bacteria, viruses, fungi, rickettsia, and protozoa. Microorganisms are normally found in the human body in small amounts and are actually indispensable. Sources of infection can be classified as endogenous and exogenous. In endogenous infections, the agent causing the problem comes from the human body. Some of the microorganisms living here exceed their limits ad start causing damage. This might happen because the immunity is compromised and it is very common in patients who have had surgery or in undernourished people. Exogenous are sources of infections that microorganisms from outside the human body find their way inside and cause illnesses or di seases. Exogenous sources of infections that can be split into three main categories: a human origin, of animal origin and of environmental origin. Animals are a source of infection. If an animal bites you, they can transfer the infection. Water, air and soil are significant other sources of infection. This can be contaminated water from parasites. Air and soil are not sources of infection themselves but they mainly contain non-pathogenic agents that can get contaminated microorganisms carried by humans or animals and contribute in spreading them. Air is one of the most important sources of spreading as we breathe air in. The term of how an infective agent can be transmitted to a person is the transmission of microorganisms directly from one person to  another by one or more reasons. These being: Droplet contact – coughing or sneezing on another person Direct physical contact – touching an infected person, including sexual contact Indirect physical contact – usually by touching i.e. soil contamination or a contaminated surface. Airborne transmission- if the microorganism can remain in the air or long periods. Fecal-oral transmission – usually from contaminated food or water sources. So transmitting of a microorganism can have many routes in which it can be caught. It can be indirect, via another organism, either a vector (mosquito) or an intermediate host (tapeworm) indirect transmission could involve zoonoses (infectious disease that can be transmitted form non-human animals) or more typically larger pathogens like macro parasites with more complex life cycles. Times when an infection is more likely to occur is when a person has a low immunity or is on long term antibiotic therapy. Poor hygiene when treating wounds or dealing with personal care can aid the transmission of infection. Any contact with bodily flu ids, hygiene i.e. dirty services or clothes (contamination).