Tuesday, March 31, 2009
3:29 AM
Saturday, March 28, 2009
♥ Tallest Building In Singapore
OUB center, UOB Plaza One and Republic Plaza shares the title of the tallest building in Singapore. The 3 buildings are of the same height, standing at 280 metres tall. All 3 buildings are located at Raffles Place, Downtown Core, Singapore.9:42 PM
♥ Tallest building in the world
The tallest building in the world is the Burj Dubai, located in North Dakota,USA, standing at 818 metres tall.3:52 AM
♥ Volcano erupted 5 times
3:35 AM
Wednesday, March 4, 2009
♥ What are some energy sources and what are their uses ?
1.Biomass energy
2.Solar Energy
3.Wind Power
4.Geothermal energy
5.Hydroelectric power
6.Coal
7.Oil
8.Natural gas
9.Nuclear power
Biomass energy, from plants, is a rich source of carbon and hydrogen, and one that can be used within the natural carbon cycle. Fast-growing plants, such as switchgrass and willow and poplar trees, can be harvested as "power crops." Biomass wastes, including forest residues, lumber and paper mill waste, crop wastes, garbage, and landfill and sewage gas, can be used to produce heat, transportation fuels, and electricity, while at the same time reducing environmental burdens.
Solar energy, power from the sun, is free and inexhaustible. Converting sunlight into useful forms is not free, but the fuel is. Sunlight has been used by humans for drying crops and heating water and buildings for millennia. A twentieth-century technology is photovoltaics, which turns sunlight directly into electricity.
Wind power is another ancient energy source that has moved into the modern era. Advanced aerodynamics research has developed wind turbines that can produce electricity at a lower cost than power from polluting coal plants.
Geothermal energy taps into the heat under the earth's crust to boil water. The hot water is then used to drive electric turbines and heat buildings.
Hydroelectric power uses the force of moving water to produce electricity. Hydropower is one of the main suppliers of electricity in the world, but most often in the form of large dams that disr
upt habitats and displace people. A better approach is the use of small, "run of the river" hydro plants.
Coal is the largest source of fuel for electricity production, and also the largest source of environmental harm. Coal provides 54 percent of the US electricity supply.
Oil is used primarily for transportation fuels, but also for power production, heat and as a feedstock for chemicals. The US imports over half of the oil we use, more than ever before.
Natural gas is a relatively clean burning fossil fuel, used mostly for space and water heating in buildings and running industrial processes. Increasingly, natural gas is used in turbines to produce electricity. Nuclear power harnesses the heat of radioactive materials to produce steam for power generation. Nuclear power provides about 21 percent of US power, but is expected to decline as old plants retire.
1:07 AM
Sunday, March 1, 2009
♥ Thermal Physics
Thermal physics, generally speaking, is the study of the statistical nature of physical systems from an energetic perspective. Starting with the basics of heat and temperature, thermal physics analyzes the first law of thermodynamics and second law of thermodynamics from the statistical perspective, in terms of the number of microstates corresponding to a given macrostate. In addition, the concept of entropy is studied via quantum theory.
A central topic in thermal physics is the canonical probability distribution. The electromagnetic nature of photons and phonons are studied which show that the oscillations of electromagnetic fields and of crystal lattices have much in common. Waves form a basis for both, provided one incorporates quantum theory.
Other topics studied in thermal physics include: chemical potential, the quantum nature of an ideal gas, i.e. in terms of fermions and bosons, Bose-Einstein condensation, Gibbs free energy, Helmholtz free energy, chemical equilibrium, phase equilibrium, the equipartition theorem, entropy at absolute zero, and transport processes as mean free path, viscosity, and conduction.
10:18 PM
