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مشكوووووووووووووووووووووور اخوي وما تقصر |
Sun safety Before you sprawl in the sun, check out the truth about tanning. What's in the sun? The sun gives off powerful radiation waves, including different kinds of ultraviolet rays. Here are the two that should concern you: UVA rays penetrate deep into the skin layer, causing premature ageing and increasing the risk of skin cancer. UVB rays burn the surface of the skin, causing it to tan and burn. What's in a tan? A substance called melanin gives the skin colour and provides some natural protection against the sun's UV rays. In sunshine, melanin builds up and the skin becomes darker. Be warned, however, melanin takes time to build up a protective layer on the surface of the skin. Stripping off the moment the sun appears means the skin is unprepared, and quickly burns. It's true that people with naturally dark skin have high levels of the melanin pigment, but no one is completely immune from burning. What's in a sunburn? A sunburn is basically an inflammation of the skin cells, as a result of exposure to the sun (also sun lamps). The skin becomes red, painful and sometimes blistered. Experts reckon that one severe burning session before the age of 15 can double the risk of skin cancer. So how how do I protect myself? In short, by having some respect for the sun. Always use a cream, block or lotion with a Sun Protection Factor (or SPF). This is basically a filter system designed to block out harmful UV rays and stop you from burning too quickly. Recent research carried out by Restoration of Appearance and Function Trust (RAFT) warns that rubbing sun cream deeply into the skin dramatically cuts the protection against dangerous rays. They also warn it can actually increase the risk of damage because the cream still stops the skin from burning, encouraging sunbathers to stay in the sun for longer. For best protection they recommend using a broad spectrum sunscreen with maximum UVA protection, and limiting your time in the sun to short periods. What's the right SPF for me? A high one. Experts actually recommend using nothing less than SPF15. Rub it on before going out in the sun and repeat the process throughout the day. If you're planning on going for a dip be sure that you're using a water resistant sun cream because sunlight actually increases in strength as it passes through water. Protecting yourself from the sun doesnt have to be a sweat. Like safer sex, if you take the right precautions then you won't risk any regrets. |
Great Man Made River Muammer Gaddafi was certainly a visionary who took on a variety of projects in his career. One of the more contentious has been the Great Man Made River that has piped water over thousands of miles from great underground deposits in the southern deserts to the various towns of Libya and in particular along the coastal belt where 90% of the population resides. Rapid development of coastal areas and increased population have placed a severe strain on the coastal water supply. On completion of the project fresh water will be readily avaliable in most Libyan towns with plenty more available for irrigation. The project had been put forward much earlier than the Gaddafi period but had been rejected as it might affect the watertable. Some now attribute the drying up of the Ubari Lakes and various waterholes to the side effects of the project. Started in 1980 the Great Man-Made River project is the largest engineering scheme currently being carried out in the world. The 4-meter diameter pipe is about 1600 km long transfers about 6.5 million cubic meters of per day. Since 1990, UNESCO has been contributing to the training of engineers and technicians and the setting up of a training center. |
بغيت تقرير عن tran sport مب كل شي بس bus و car .. بغيته شوي طويل بحيث يكفي ل 3 صفحات وابغيه ف اسرع وقت لو ممكن .. |
اقتباس:
In the beginning of creature, human being had tried to use several means to transport things, voice, water, and him also. These were the first basic points of transport technology. Aspects of transport The field of transport has several aspects: loosely they can be divided into a triad of infrastructure, vehicles, and operations. Infrastructure includes the transport networks (roads, railways, airways, waterways, canals, pipelines, etc.) that are used, as well as the nodes or terminals (such as airports, railway stations, bus stations and seaports). The vehicles generally ride on the networks, such as automobiles, bicycles, buses, trains, and aircraft. The operations deal with the way the vehicles are operated on the network and the procedures set for this purpose including the legal environment (Laws, Codes, Regulations, etc.) Policies, such as how to finance the system (for example, the use of tolls or gasoline taxes) may be considered part of the operations. Broadly speaking, the design of networks are the domain of civil engineering and urban planning, the design of vehicles of mechanical engineering and specialized subfields such as nautical engineering and aerospace engineering, and the operations are usually specialized, though might appropriately belong to operations research or systems engineering. Transport and communications Transport and communication are $$$$ substitutes and complements. Though it might be possible that sufficiently advanced communication could substitute for transport, one could telegraph, telephone, fax, or email a customer rather than visiting them in person; it has been found that those modes of communication in fact generate more total interactions, including interpersonal interactions. The growth in transport would be impossible without communication, which is vital for advanced transportation systems, from railroads which want to run trains in two directions on a single track, to air traffic control which requires knowing the location of aircraft in the sky. Thus, it has been found that the increase of one generally leads to more of the other. Transport in general is considered as the main nerve of the life upon the globe, because it makes the universe is very small be reducing the distance and saving time. So any development without transport aspect cannot be achieved للتذكير : ,، هذا الموضوع ليس للغش و النقل الاعمى دون فائدة,، ,، سيتم وضع المصادر وبعض المعلومات المساعده حتى نفتح المجال للطلاب بالاعتماد على انفسهم ,، |
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