Vajad kellegagi rääkida?
Küsi julgelt abi LasteAbi
Logi sisse Registreeri konto
Ega pea pole prügikast! Tõsta enda õppeedukust ja õpi targalt. Telli VIP ja lae alla päris inimeste tehtu õppematerjale LOE EDASI Sulge

"fuels" - 65 õppematerjali

thumbnail
20
pptx

Green Illusions - book powerpoint - alternative energy

czp-vecer.si/vecer2000/20131211/5023698_ Primarily researches social, cultural, political and economic .jpg conditions influencing energy policy priorities and project outcomes Introduction This book talks about the negative side effects of the alternative energy like wind turbines, solar cells and bio fuels . We don't have an energy crisis. We have a consumption crisis. And this book, offers refreshingly straight talk about what's wrong with the way we think and talk about the problem. Though we generally believe we can solve environmental problems with more energy, Solar cells Advantages: Simple  Low cost  Reduce pollution  Increase home safety  Good for remote locations  Clean and renewable  No noise http://...

Inglise keel
6 allalaadimist
thumbnail
4
docx

Home reading - Veracruz

Master carvers, the Olmec disappeared mysteriously around 400 b.c.,leaving behind gigantic asalt heads believed to represent their rulers.Most are n display in Mxico's museums, including the Museum o Anthropology in Xalap (right), the capital of Veracruz state. Many of the Olmec sities were locates atop vast salt domes, witch, to modern feologists, means the presence of oil.Today that oil fuels a billon-dollar industry, second only to manufacturing.Mexico is the leading oil producer in Latin Ametica, with the world's eighth largest reserves.Yet even the gargantuan oil industry has been vulnerable during the country's economic crisis.To raise cash to service the national debt, Mexico's stateowned petroleum company,Petroleos Mexicanos, or Pemex, has been hanging `'For sale" signs on plants that produce petrochemicals for photographic film,antifreeze, nylon stockings, nd fertilizers....

Inglise keel
21 allalaadimist
thumbnail
1
docx

Hüdroenergia - ettekanne

At times of low electrical demand, excess generation capacity is used to pump water into the reservoir. And when there is a big demand, like in the evenings, then the water is released and flows through the turbines. there are many Advantages for hydropower. *The mayor advantage of hydroelectricity is eliminating the cost of fuel. You don't have to fear about the increasing cost of fossil fuels like oil and natural gas. *The second advantage is that hydroelectric plants last longer than fuel-fired plants. Some hydro plants have been operational about 100 years. *Operating labor costs are low as well because the plants are automated. *And Because the hydroelectric dams do not burn fossil fuels, they do not directly produce carbon dioxide. *The reservoirs can also provide facilities for water sports, and become tourist attractions themselves. In...

Inglise keel
27 allalaadimist
thumbnail
2
doc

Global Warming

This increase of temperatures is happening at a pace that outstrips anything the Earth has seen in the past 100 million years. We have caused all of this over many years of over industrialization in this growing world. Many different things cause the greenhouse effect. The amount of carbon dioxide in the atmosphere is increasing because of the massive consumption of fossil fuels such as oil, coal, and natural gas. Another contributing factor is the the amount of forest logged. Every second of the day the area of a football field in trees is cleared by either being logged or burnt. The potential costs of cutting down on greenhouse gas emissions might sacrifice economic growth and our standard of living. By doing this we might need to change our habits and behavior. Furthermore we need to make investments in technology ­ we need to adopt green...

Inglise keel
78 allalaadimist
thumbnail
1
rtf

IPCC summary

2.The three main things that alter the energy balance of the climate system are the changes in the atmospheric abundance of greenhouse gases and aerosols, in solar radiation and in land surface properties. 3.The two sources for the increased concentration of CO2 in the atmosphere are production, distribution and consumption of fossil fuels and as a by-product from cement production. 4.The two main sources of methane pollution are agriculture and fossil fuel use. 5.Volcanic aerosols are not included to the list because of their episodic nature. 6.The world's oceans absorb more than 80% of heat. 7.The total 20th-century rise is estimated to be 0.17 [0.12 to 0.22] m. 8.Arctic has seen twice the increase of global temperature rate. 9.Increased precipitation has been observed in eastern parts of North and South America,...

Geograafia
5 allalaadimist
thumbnail
1
doc

Utoopia arhitektuuris

· 70 million people a year migrate from the country to cities. That is about 130 a minute, that means very massive globalization. · At this rate, our future cities may turn out to be quasi-temporary, missing the basics of human life, such as water and electricity, still belching out the waste of fuels that warm the globe. · The New City in China: The buildings and all around it work like biological, growing beings, photosynthesising and producing and re- using their own energy. China will be largest solar manufacturer in the world. · Masdar city in United Arab Emirates near Abu Dhabi. First city in the world, that would rely on the renewable energy sources. 6 square kilometers, home for 50,000 people and 1,500 businesses....

Inglisekeelne geograafia
11 allalaadimist
thumbnail
1
doc

Windpower

The first practical windmills were built in Afghanistan, from the 7th century to grind corn and draw up water. The first windmill for electricity production was built in Scotland in 1887 to power the lighting in the cottage, thus making it the first house in the world to have its electricity supplied by wind power. During the Second World War, small wind generators were to recharge submarine batteries. In the 1990s, wind power became more important, because fossil fuels pollute the atmosphere and humanity needed alternative fuels. That's because wind power is so necessary. Wind power is also renewable energy and it doesn't cause greenhouse gases. Building windmills is actually quite expensive and they need repairing or replacing about every 12-15 years. And strong winds can also break the wind turbines. Considering these things the wind power cost more than the energy from fossil fuels....

Inglise keel
11 allalaadimist
thumbnail
1
doc

Comparison of diesel and petrol engine

The final stroke is the exhaust stroke. The exhaust valve opens when the piston hits the bottom, and the piston pushes the exhaust out. Both engines also have camshafts, which operate the opening and closing of valves. Difference The main difference between a gasoline engine and a diesel engine is the fuel used. The main difference between these fuels is the combustion ratio at which each will explode. Gasoline does not self-ignite when compressed, because it does not generate enough heat. It needs activation energy to explode, and this energy is generated by a spark plug at the top of the cylinder. Diesel on the other hand, does not require a spark plug to ignite it because it generates enough heat when it is completely compressed to ignite itself and cause explosion. ....

Inglise keel
16 allalaadimist
thumbnail
1
docx

Environtment

Firstly, the ever growing need for energy is taking its toll on the environment. Due to the fast growth of the economical and industrial sector in recent years the need for energy has grown dramatically. Global warming which is responsible for the melting of the ice cap which leads to the rise of sea level is mainly caused by the high use of fossil fuels . Secondly, over-consumption caused by population growth on Earth leads to pollution which is becoming highly dangerous to the environment. The decomposition of materials used nowadays is often hundreds of years long. Unfortunately the number of reusable products is getting smaller by the day. Often the reusable product is also less affordable to the consumer which ends up taking a toll at the environment due to the lack of financial security in the economical state the world id in at the moment...

Inglise keel
25 allalaadimist
thumbnail
13
odt

Tuuma energia

Fission is a form of nuclear transmutation because the resulting fragments are not the same element as the original atom. Nuclear fission produces energy for nuclear power and to drive the explosion of nuclear weapons. Both uses are made possible because certain substances called nuclear fuels undergo fission when struck by free neutrons and in turn generate neutrons when they break apart. This makes possible a self-sustaining chain reaction that releases energy at a controlled rate in a nuclear reactor or at a very rapid uncontrolled rate in a nuclear weapon. The amount of free energy contained in nuclear fuel is millions of times the amount of free energy contained in a similar mass of chemical fuel such as gasoline, making nuclear fission a very...

Füüsika
22 allalaadimist
thumbnail
15
ppt

Inglise keel " The problems the contemporary world faces "

Water pollution caused by chemicals and sewer water dumped into water. Soil pollution caused by chemicals released into underground lakes. Natural resources running out Rainforests are being cut down constantly. There are not enough fresh water in some parts of the world. Fossil fuels are used too much and most of its reserves will be used up by 2050. Endangered species 40 percent of all organisms are endangered All the different species are important for biodiversity Habitat loss and hunting are the most widespread cause of species endangerment . Climate change Climate change is a change in the statistical distribution of weather over periods of time. The Earth's average surface temperature has risen by 0.76° C since 1850....

Inglise keel
18 allalaadimist
thumbnail
20
docx

Energeetika arengu plaanimine

Though in some G8 nations the cost can be significantly higher at 7.88p (~15¢/kWh).Achieving further cost reductions as indicated in the table below requires further technology development, market deployment, an increase in production capacities to mass production levels,and of the establishment of an emissions trading scheme and/or carbon tax which would attribute a cost to each unit of carbon emitted; thus reflecting the true cost of energy production by fossil fuels which then could be used to lower the cost/kWh of these renewable energies. Type 2001 energy costs Wind 4­8 ¢/kWh Solar photovoltaic 25­160 ¢/kWh Solar thermal 12­34 ¢/kWh...

Energeetika arengu plaanimine
38 allalaadimist
thumbnail
7
docx

Report Of Canada

Tallinn English College Report of Canada 8a Teacher: Merike Sisask Composer: Kärt Kalvet 2010 Canada, Kärt Kalvet 8a Canada General Information Canada is in North America. It's area is 9220970 sq km. Canada's population is 313.612.000 people. Canada is divided into 10 provinces and 3 territories. The capital of Canada is Ottawa. Canada has constitutional monarchy. The head of state in Canada's government is the Queen of England. There are two main languages in Canada: English and French. Canada's curreny is Canadian dollar (1 dollar=100 cents[Can$]). The highest peak of Canada is Mount Logan, 5959 metres. The lowest point is sea level. The longest river is the Mackenzie. The climate and geography of Canada vary greatly from temperate in the south to arctic in the north and from islands and plains in the east to mountains in the west. Location...

Inglise teaduskeel
15 allalaadimist
thumbnail
1
odt

Life in the future

Everything will be done electronically. Classes will be conjoyned together such as, English and History, Math and Science, etc. School will be more interesting and fun, plus school days will be shorter. By 2050 the work will be much easier. People will use computers to do their job. Everyone will have equal pay. The work days will be shorter. Humans have to work only 5 hours. In transport, cars will run on new, clean fuels and they will go very fast. Cars will have computers to control the speed of the car and there won't be any accidents. Today, many cars have computers that tell drivers exactly where they are. By 2050, the computer will control the car and drive it to your destination. On the other hand, space planes will take people halfway around the world in two hours. In the 2050 people can order the drinks and foods what she or he wants. There will be special...

Inglise keel
37 allalaadimist
thumbnail
9
doc

Jamaica

Trade (2005): Exports--$1.5 billion: alumina, bauxite, sugar, bananas, chemicals, citrus fruits and products, rum, coffee. Major markets (2005)--U.S. 26.3%, U.K. 10.8%, Canada 19.6%, Trinidad and Tobago 0.6%, Japan 1.0%. Imports (2005)--$4.7 billion: machinery, transportation and electrical equipment, food, fuels , fertilizer. Major suppliers (2000)--U.S. 40.1%, Trinidad and Tobago 9.0%, Japan 4.5%, U.K. 2.4%, Canada 2.3%. Climate The climate in Jamaica is tropical, with hot and humid weather, although higher inland regions have a more temperate climate. Some regions on the south coast, such as the Liguanea Plain and the Pedro Plains are relatively dry rain-shadow areas. Culture Though a small nation, Jamaica is rich in culture, and has a strong global presence. The...

Inglise keel
15 allalaadimist
thumbnail
1
doc

Carbon capture and storage

Humans are changeing the planet with their ordinary life. The principle cause of climate change is the increase in carbon dioxide concentrations in the atmosphere. The main cause of that is the burning of fossile fuels . This is leading to the global warming. People have discovered a way to reduce the amount of CO2 in the atmosphere. It is possible to seperate the CO2 from the other gases by adding liquid which is very good at absorbing CO2. Then it can be pumped to underground. Scientist came up with this idea because methane gas has been down there for thousands of years and it has not come up. So they expect that the CO2 won't be coming up either...

Akadeemiline inglise keel
39 allalaadimist
thumbnail
5
docx

Vesinikauto

Vesinikauto Referaat Tallinn 2010 Sissejuhatus Mina valisin teemaks vesinikauto, kuna see on maailma paremaks muutmise jaoks väga oluline uuendus. Ma olen väga huvitatud vesinikautost ja tahaks rohkem teada selle kohta ning sellepärast valisingi sellise teema. Vesinikauto on minu jaoks väga huvitav ning ma tahaks väga teada kuidas see töötab täpsemalt ja kuidas on see maailmale kasulikum kui tavaline bensiini või diisli auto. Samuti tahaks teada, kas on ka vesinikautol miinuseid, ehk kas on see ka kuidagi kahjulik. Auto tööpõhimõte Vesinikauto töötab üldiselt sisepõlemismootoriga, kus kasutatakse hapnikku vesiniku põletamiseks. Selle põlemise saaduseks on ainult vesi (veeauruna, samuti on saadusteks lämmastik, mis sisenes mootorisse õhust ja kuna lämmastik ei põle väljub seda samal hulgal [6] ) , seega on see väga keskkonnasõbralik ja ei saasta loodust üldsegi nii nagu seda...

Keemia
19 allalaadimist
thumbnail
2
docx

Improved Windows for Cold Climates

Improved Windows for Cold Climates In this paper the possibilities of improving the energy performance of windows in cold climates are exam-ined. The background for using windows with improved energy performance is the need to reduce the en-ergy consumption in buildings. Since the heat loss through windows often represents half the total heat loss from houses, much energy can be saved by developing and using better windows with respect to energy performance. The main purpose of having windows in houses is that they provide daylight and view, but windows also provide solar gain that can be utilized as a contribution to the space heating in the building. Therefore the windows also have a positive influence on the energy balance of buildings. To evaluate the possibilities for developing better windows with respect to energy performance when used in Nordic and arctic climates, seven different window types have been examin...

Ökoloogia ja...
6 allalaadimist
thumbnail
2
doc

Wind energy vs oil shale

It means that if the wind power were renewed, it would be 17 370 millions EEK cheaper. The fact that wind energy saves resources and produces neither dangerous emissions nor toxic waste is also in favour of wind energy. Power from oil shale In the time when many world countries close factories that use fossil fuels , Estonia is starting to build new factories that work with oil shale. Taxpayers pay subsidy for oil shale in every year unconditionally the amount electricity produced and also when it is known that this source of energy has no perspective. Also it is not economically useful to produce electricity from oil shale. It would be more beneficial to use oil shale for producing oil shale oil. In present price of black oil, producing electricity from oil shale is causing 21 EUR loss per ton of oil shale...

Inglise keel
18 allalaadimist
thumbnail
8
ppt

Renewable energy

Renewable energy uses natural resources that can be replaced or "renewed" without harming the environment and does not contribute to the greenhouse effect and global warming. Non-renewable energy Non-renewable energy comes from sources that can't be replenished in a short period of time. We get most of our energy from nonrenewable energy sources, which include fossil fuels such as oil, natural gas, coal and from nuclear energy. Unfortunately, burning fossil fuels produces greenhouse gases like carbon dioxide and methane which may cause global warming. Wind energy is the world's fastest growing energy technology. Most renewable energy comes either directly or indirectly from the sun. Hydroelectric energy is the oldest and largest source of renewable energy....

Inglise keel
12 allalaadimist


Sellel veebilehel kasutatakse küpsiseid. Kasutamist jätkates nõustute küpsiste ja veebilehe üldtingimustega Nõustun