Friday, May 7, 2010
Thursday, May 6, 2010
THE EARTH [LIVING IN DIFFERENT WORLD]
Today man’s modern lifestyle and insufficient utilization of conventional fuels are being considered for huge power losses. Fossile fuel combustion and emission of (green house gasses having hing temperature in it cause green house effect ex:CO2 , CO etc) from industries and vehicles are considered as a cause of temperature increment in the environment.
The effect of global warming is due to rapid consumption of fossile fuel deforestation man’s luxurious lifestyle and emission of CO , CO2 from industries and vehicles which all are not only responsible for global warming, but(these also things) responsible for degradation of human health scarity of fresh drinking water and air pollution.
These things alters the complete cycle of Ecology system in the environment.
It means the global warming changes the scenario of the whole planet.
Now a days we might have observed that world is frequently facing large haricanes, droughts, floods,earth quick,and volcano blasts which cause the millions of people death and after the wild as well as underwater life.
Now lets comes to the main point of the article that is know about global warming .
What is global warming ?
Ans : Well “It is the increment in the average temperature of earth surface”.
The sentence seems to be very simple,but it creates disaster effects as discussed above.
Hence its really necessary to avoid the depletion of natural resources,ozone layer and ground water and protect the forest from the deforestation.
The effect of global warming is due to rapid consumption of fossile fuel deforestation man’s luxurious lifestyle and emission of CO , CO2 from industries and vehicles which all are not only responsible for global warming, but(these also things) responsible for degradation of human health scarity of fresh drinking water and air pollution.
These things alters the complete cycle of Ecology system in the environment.
It means the global warming changes the scenario of the whole planet.
Now a days we might have observed that world is frequently facing large haricanes, droughts, floods,earth quick,and volcano blasts which cause the millions of people death and after the wild as well as underwater life.
Now lets comes to the main point of the article that is know about global warming .
What is global warming ?
Ans : Well “It is the increment in the average temperature of earth surface”.
The sentence seems to be very simple,but it creates disaster effects as discussed above.
Hence its really necessary to avoid the depletion of natural resources,ozone layer and ground water and protect the forest from the deforestation.
Sunday, March 21, 2010
ENGINEERING KNOWLEDGE TEST FORM-2011
NOISE
Electronic noise
Main article: Noise (electronics)
Electronic noise exists in all circuits and devices as a result of thermal noise, also referred to as Johnson Noise. It is caused by random variations in current or voltage caused by the random movement of charge carriers (usually electrons) carrying the current as they are jolted around by thermal energy. Thermal noise can be reduced by reducing the temperature of the circuit. This phenomenon limits the minimum signal level that any radio receiver can usefully respond to, because there will always be a small but significant amount of thermal noise arising in its input circuits. This is why radio telescopes, which search for very low levels of signal from space, use front-end low-noise amplifier circuits cooled with liquid nitrogen.
There are several other sources of noise in electronic circuits such as shot noise, seen in very low-level signals where the finite number of energy-carrying particles becomes significant, or flicker noise (1/f noise) in semiconductor devices.
Main article: Noise (electronics)
Electronic noise exists in all circuits and devices as a result of thermal noise, also referred to as Johnson Noise. It is caused by random variations in current or voltage caused by the random movement of charge carriers (usually electrons) carrying the current as they are jolted around by thermal energy. Thermal noise can be reduced by reducing the temperature of the circuit. This phenomenon limits the minimum signal level that any radio receiver can usefully respond to, because there will always be a small but significant amount of thermal noise arising in its input circuits. This is why radio telescopes, which search for very low levels of signal from space, use front-end low-noise amplifier circuits cooled with liquid nitrogen.
There are several other sources of noise in electronic circuits such as shot noise, seen in very low-level signals where the finite number of energy-carrying particles becomes significant, or flicker noise (1/f noise) in semiconductor devices.
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