Cable car
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For the song by The Fray, see Over My Head (Cable Car).
For the alcoholic drink, see Cable Car (Cocktail).
A cable car is any of a variety of transportation systems relying on cables to pull vehicles along or lower them at a steady rate, or a vehicle on these systems.
Varieties in which the vehicle is suspended from a cable:
An aerial tramway consists of a cabin suspended from a cable, pulled by another cable.
A gondola lift consists of a loop of cable that is strung between two or more stations, usually over intermediate supporting towers, from which cars are suspended.
A ropeway conveyor is a subtype of gondola lift, from which containers for goods rather than passenger cars are suspended.
In an aerial lift transport, gondolas or open chairs are hauled above the ground by means of a cable.
Varieties in which the vehicle rests on rails or a road:
A system to haul trains along streets, see Cable car (railway)
The particular cable car system in operation in San Francisco, California, see San Francisco cable car system
A funicular consists of a pair of railway cars that alternately ascend and descend an inclined right-of-way, attached to a common cable.
A cable railway uses a cable or rope to haul trains.
Monday, November 2, 2009
TELEVISION
Television
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Jump to: navigation, search
"TV" redirects here. For other uses, see TV (disambiguation).
Television (TV) is a widely used telecommunication medium for transmitting and receiving moving images, either monochromatic ("black and white") or color, usually accompanied by sound. "Television" may also refer specifically to a television set, television programming or television transmission. The word is derived from mixed Latin and Greek roots, meaning "far sight": Greek tele (τῆλε), far, and Latin visio, sight (from video, vis- to see, or to view in the first person).
Commercially available since the late 1930s, the television set has become a common communications receiver in homes, businesses and institutions, particularly as a source of entertainment and news. Since the 1970s the availability of video cassettes, laserdiscs, DVDs and now Blu-ray Discs, have resulted in the television set frequently being used for viewing recorded as well as broadcast material.
Although other forms such as closed-circuit television are in use, the most common usage of the medium is for broadcast television, which was modeled on the existing radio broadcasting systems developed in the 1920s, and uses high-powered radio-frequency transmitters to broadcast the television signal to individual TV receivers.
Broadcast TV is typically disseminated via radio transmissions on designated channels in the 54–890 megahertz frequency band[1]. Signals are now often transmitted with stereo and/or surround sound in many countries. Until the 2000s broadcast TV programs were generally recorded and transmitted as an analog signal, but in recent years public and commercial broadcasters have been progressively introducing digital television broadcasting technology.
A standard television set comprises multiple internal electronic circuits, including those for receiving and decoding broadcast signals. A visual display device which lacks a tuner is properly called a monitor, rather than a television. A television system may use different technical standards such as digital television (DTV) and high-definition television (HDTV). Television systems are also used for surveillance, industrial process control, and guiding of weapons, in places where direct observation is difficult or dangerous.
Amateur television (ham TV or ATV) is also used for experimentation, pleasure and public service events by amateur radio operators. Ham TV stations were on the air in many cities before commercial TV stations came on the air.[2]
From Wikipedia, the free encyclopedia
Jump to: navigation, search
"TV" redirects here. For other uses, see TV (disambiguation).
Television (TV) is a widely used telecommunication medium for transmitting and receiving moving images, either monochromatic ("black and white") or color, usually accompanied by sound. "Television" may also refer specifically to a television set, television programming or television transmission. The word is derived from mixed Latin and Greek roots, meaning "far sight": Greek tele (τῆλε), far, and Latin visio, sight (from video, vis- to see, or to view in the first person).
Commercially available since the late 1930s, the television set has become a common communications receiver in homes, businesses and institutions, particularly as a source of entertainment and news. Since the 1970s the availability of video cassettes, laserdiscs, DVDs and now Blu-ray Discs, have resulted in the television set frequently being used for viewing recorded as well as broadcast material.
Although other forms such as closed-circuit television are in use, the most common usage of the medium is for broadcast television, which was modeled on the existing radio broadcasting systems developed in the 1920s, and uses high-powered radio-frequency transmitters to broadcast the television signal to individual TV receivers.
Broadcast TV is typically disseminated via radio transmissions on designated channels in the 54–890 megahertz frequency band[1]. Signals are now often transmitted with stereo and/or surround sound in many countries. Until the 2000s broadcast TV programs were generally recorded and transmitted as an analog signal, but in recent years public and commercial broadcasters have been progressively introducing digital television broadcasting technology.
A standard television set comprises multiple internal electronic circuits, including those for receiving and decoding broadcast signals. A visual display device which lacks a tuner is properly called a monitor, rather than a television. A television system may use different technical standards such as digital television (DTV) and high-definition television (HDTV). Television systems are also used for surveillance, industrial process control, and guiding of weapons, in places where direct observation is difficult or dangerous.
Amateur television (ham TV or ATV) is also used for experimentation, pleasure and public service events by amateur radio operators. Ham TV stations were on the air in many cities before commercial TV stations came on the air.[2]
Monday, October 19, 2009
Test Tube Baby
Children are the gift of god but some couples are deprived of this gift. Scientists and doctors have invented a special technique i.e. test tube baby or I.V.F (in vitro fertilization) and embryo transfer. The first test baby was born in 1978 and he was Louise Brown.
In this system of fertilization, the egg is fertilized outside the woman’s body and is then transferred inside the uterus. Woman up to the age of 38 can get it done.
Getting a test tube baby is a time consuming phenomenon but an expensive technique. Being costly, this procedure is tried only after all other available options to conceive have failed.
It can be tried on females with faulty fallopian tubes or if no eggs are formed in the ovaries and if the male partner does not produce enough motile sperms to cause fertilization.
Method of In Vitro Fertilization
The procedure starts by taking various tests and detailed ultrasound is carried out. Proper semen analysis is also done. Injections are given to produce eggs.
Then an egg is taken from the ovary by a very thin needle through vagina. This is done under great medical supervision and takes around 30 minutes.
Now this egg is placed in the incubator before it is fertilized, till the time sperms are collected from the male partner and washed. After this the patient is allowed to go home.
Fertilization is then done in especially prepared fluid medium and after 12 hours the egg starts dividing into cells. About 48-72 hours later, the embryos become ready for transfer. The embryos are kept under observation for 2-3 days and then the best-selected embryo is transferred into the lady’s uterus.
When the pregnancy is confirmed, regular check-ups as per normal pregnancy procedures are done
In this system of fertilization, the egg is fertilized outside the woman’s body and is then transferred inside the uterus. Woman up to the age of 38 can get it done.
Getting a test tube baby is a time consuming phenomenon but an expensive technique. Being costly, this procedure is tried only after all other available options to conceive have failed.
It can be tried on females with faulty fallopian tubes or if no eggs are formed in the ovaries and if the male partner does not produce enough motile sperms to cause fertilization.
Method of In Vitro Fertilization
The procedure starts by taking various tests and detailed ultrasound is carried out. Proper semen analysis is also done. Injections are given to produce eggs.
Then an egg is taken from the ovary by a very thin needle through vagina. This is done under great medical supervision and takes around 30 minutes.
Now this egg is placed in the incubator before it is fertilized, till the time sperms are collected from the male partner and washed. After this the patient is allowed to go home.
Fertilization is then done in especially prepared fluid medium and after 12 hours the egg starts dividing into cells. About 48-72 hours later, the embryos become ready for transfer. The embryos are kept under observation for 2-3 days and then the best-selected embryo is transferred into the lady’s uterus.
When the pregnancy is confirmed, regular check-ups as per normal pregnancy procedures are done
Monday, October 12, 2009
A new MP3 player aims to help bicyclist
If you enjoy going on long bike rides, then you probably bring your iPod or MP3 player along for the ride. The problem with that is the headphones could get tangled up and that could become dangerous. Until now, I can’t really think of any MP3 players specifically designed for bicyclists, except for the new Podio.
The Podio has two main features that makes it stand out, one being it can attach to any sized handlebars, and the other being a built-in speaker on the device itself. I’m not sure if it has a normal headphone jack, but I’m sure it would. In addition, it comes with a 20 hour battery life, so the Podio won’t die on any bike ride, and it comes with 2GB of storage space. 2GB isn’t a whole lot of space, but it’s decent enough. I wouldn’t purchase this MP3 player to become your main portable music device, but I would purchase it if I biked for long periods of time by myself.
Unfortunately, no word on pricing or availability at this time.
The Podio has two main features that makes it stand out, one being it can attach to any sized handlebars, and the other being a built-in speaker on the device itself. I’m not sure if it has a normal headphone jack, but I’m sure it would. In addition, it comes with a 20 hour battery life, so the Podio won’t die on any bike ride, and it comes with 2GB of storage space. 2GB isn’t a whole lot of space, but it’s decent enough. I wouldn’t purchase this MP3 player to become your main portable music device, but I would purchase it if I biked for long periods of time by myself.
Unfortunately, no word on pricing or availability at this time.
Wednesday, September 30, 2009
hybrid car
The Benefits of a Hybrid Car
You might wonder why anyone would build such a complicated machine when most people are perfectly happy with their gasoline-powered cars. The reason is twofold: to reduce tailpipe emissions and to improve mileage. These goals are actually tightly interwoven.
Let's take the example of the California emissions standards, which dictate how much of each type of pollution a car is allowed to emit in California. The amount is usually specified in grams per mile (g/mi). For example, the low emissions vehicle (LEV) standard allows 3.4 g/mi of carbon monoxide. The key thing here is that the amount of pollution allowed does not depend on the mileage your car gets. But a car that burns twice as much gas to go a mile will generate approximately twice as much pollution. That pollution will have to be removed by the emissions control equipment on the car. So decreasing the fuel consumption of the car is one of the surest ways to decrease emissions.
Carbon dioxide (CO2) is another type of pollution a car produces. The U.S. government does not regulate it, but scientists suspect that it contributes to global warming. Since it is not regulated, a car has no devices for removing CO2 from the exhaust. A car that burns twice as much gas adds twice as much CO2 to the atmosphere.
Auto makers in the United States have another strong incentive to improve mileage. They are required by law to meet Corporate Average Fuel Economy (CAFE) standards. The current standards require that the average mileage of all the new cars sold by an auto maker should be 27.5 mpg (8.55 liters per 100 km). This means that if an auto maker sells one hybrid car that gets 60 mpg (3.92 liters per 100 km), it can then sell four big, expensive luxury cars that only get 20 mpg (11.76 liters per 100 km).
You can actually take steps to drive your car in ways that increase its gas mileage. In the next section, we'll look at some tips for increasing the efficiency of your hybrid (or just gas-powered) car
You might wonder why anyone would build such a complicated machine when most people are perfectly happy with their gasoline-powered cars. The reason is twofold: to reduce tailpipe emissions and to improve mileage. These goals are actually tightly interwoven.
Let's take the example of the California emissions standards, which dictate how much of each type of pollution a car is allowed to emit in California. The amount is usually specified in grams per mile (g/mi). For example, the low emissions vehicle (LEV) standard allows 3.4 g/mi of carbon monoxide. The key thing here is that the amount of pollution allowed does not depend on the mileage your car gets. But a car that burns twice as much gas to go a mile will generate approximately twice as much pollution. That pollution will have to be removed by the emissions control equipment on the car. So decreasing the fuel consumption of the car is one of the surest ways to decrease emissions.
Carbon dioxide (CO2) is another type of pollution a car produces. The U.S. government does not regulate it, but scientists suspect that it contributes to global warming. Since it is not regulated, a car has no devices for removing CO2 from the exhaust. A car that burns twice as much gas adds twice as much CO2 to the atmosphere.
Auto makers in the United States have another strong incentive to improve mileage. They are required by law to meet Corporate Average Fuel Economy (CAFE) standards. The current standards require that the average mileage of all the new cars sold by an auto maker should be 27.5 mpg (8.55 liters per 100 km). This means that if an auto maker sells one hybrid car that gets 60 mpg (3.92 liters per 100 km), it can then sell four big, expensive luxury cars that only get 20 mpg (11.76 liters per 100 km).
You can actually take steps to drive your car in ways that increase its gas mileage. In the next section, we'll look at some tips for increasing the efficiency of your hybrid (or just gas-powered) car
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