Tom talking to his girlfriend:
T:You can't immagine what happened today!
GF:No I can't immagine. Tell me please.
T:Today happened the most interesting, the most unnusual thing in my life.
GF:What happened Tom? Please tell me, because I am interrested very much.
T:Today while I was on the way to celebrate the most important birthday in my life,my 18-th birthday, on the road lied a body, which I don't know.
GF: A body?That is very scary Tom. To see a body lying on the road.
T: Yes a body. When I get out to see what is happening (I was drived by my friend) my friend got out and I was all alone there on the road.
GF: And what happened then Tom?
T: Then some guys grabbed me from behind and put me a balaclava.
GF:DON"T SCARE ME TOM, PLEASE!
T: No, it isn't scary at all my love.
GF: If it isn't scary what is it then?
T: Then the guys put im in the car and drove me to some strange place, which at the beggining I didn't know and they put me on the chair.
GF: AND?
T: And in the beggining the lights flashed and revealed the whole room. When the guys removed the balaclava, then I realised that all the time my friends were joking with me.
GF: Your friends???
T: Yeah my friends. They explaned me that all this was a joke for my 18-th birthday.
GF: And did you forgive them??
T: Yes, I realised that this was a sweat joke and there wasn't room for angryment.
GF: Tom this was a bit of suprise from your friends, and a good joke.
T: Yes, this was only a GOOD JOKE!
Monday, April 23, 2007
Inventions that changed the world
RADIO
Radio is the wireless transmission of signals, by modulation of electromagnetic waves with frequencies below those of visible light.
Electromagnetic radiation travels by means of oscillating electromagnetic fields that pass through the air and the vacuum of space. It does not require a medium of transport. Information is carried by systematically changing (modulating) some property of the radiated waves, such as their amplitude or their frequency. When radio waves pass an electrical conductor, the oscillating fields induce an alternating current in the conductor. This can be detected and transformed into sound or other signals that carry information.
The word 'radio' is used to describe this phenomenon, and television and radio transmissions are classed as radio frequency emissions.
Electromagnetic radiation travels by means of oscillating electromagnetic fields that pass through the air and the vacuum of space. It does not require a medium of transport. Information is carried by systematically changing (modulating) some property of the radiated waves, such as their amplitude or their frequency. When radio waves pass an electrical conductor, the oscillating fields induce an alternating current in the conductor. This can be detected and transformed into sound or other signals that carry information.
The word 'radio' is used to describe this phenomenon, and television and radio transmissions are classed as radio frequency emissions.
Originally, radio or radioteleography was called 'wireless telegraphy', which was shortened to 'wireless'. The prefix radio- in the sense of wireless transmission was first recorded in the word radioconductor, coined by the French physicist Edouard Branly in 1897 and based on the verb to radiate (in Latin "radius" means "spoke of a wheel, beam of light, ray"). 'Radio' as a noun is said to have been coined by advertising expert Waldo Warren (White 1944). The word appears in a 1907 article by Lee de Forest, was adopted by the United States Navy in 1912 and became common by the time of the first commercial broadcasts in the United States in the 1920s. (The noun 'broadcasting' itself came from an agricultural term, meaning 'scattering seeds'.) The American term was then adopted by other languages in Europe and Asia, although British Commonwealth countries retained the term 'wireless' until the mid-20th century. In Japanese, the term 'wireless' is the basis for the term 'radio wave' although the term for the device that listens to radio waves is literally 'device for receiving sounds'.
In recent years the term 'wireless' has gained renewed popularity through the rapid growth of short range networking, e.g. WLAN ('Wireless Local Area Network'),WiFi, Bluetooth as well as mobile telephony, e.g. GSM and UMTS. Today, the term 'radio' often refers to the actual transceiver device or chip, whereas 'wireless' refers to the system and/or method used for radio communication. Hence one talks about radio transceivers and Radio Frequency Identification (RFID), but about wireless devices and wireless sensor networks.
In recent years the term 'wireless' has gained renewed popularity through the rapid growth of short range networking, e.g. WLAN ('Wireless Local Area Network'),WiFi, Bluetooth as well as mobile telephony, e.g. GSM and UMTS. Today, the term 'radio' often refers to the actual transceiver device or chip, whereas 'wireless' refers to the system and/or method used for radio communication. Hence one talks about radio transceivers and Radio Frequency Identification (RFID), but about wireless devices and wireless sensor networks.
The identity of the original inventor of radio, at the time called wireless telegraphy, is contentious. Development from a laboratory demonstration to commercial utility spanned several decades and required the efforts of many practitioners. The controversy over who invented the radio, with the benefit of hindsight, can be broken down as follows:
In 1878, David E. Hughes transmitted Morse code by radio at and below the super low frequency range (via a clockwork transmitter).
In 1888, Heinrich Hertz produced and measured the Ultra High Frequency range (via a sparkgap transmitter).
In 1891, Nikola Tesla began wireless research. He developed means to reliably produce radio frequencies, publicly demonstrated the principles of radio, and transmitted long-distance signals. He obtained a U.S. patent for the invention of the radio, as defined as "wireless transmission of data."
Between 1893 and 1894, Roberto Landell de Moura, a Brazilian priest and scientist, conducted experiments. He did not publicise his achievement until 1900 but later obtained Brazilian and American patents.
Alexander Stepanovich Popov, in 1894, built his first radio receiver, which contained a coherer. Further refined as a lightning detector, he presented it to the Russian Physical and Chemical Society on May 7, 1895.
Guglielmo Marconi was an early radio experimenter. He realised the first long distance transmissions and founded the first commercial organisation devoted to the development and use of radio
Reginald Fessenden and Lee de Forest invented amplitude-modulated (AM) radio, so that more than one station can send signals (as opposed to spark-gap radio, where one transmitter covers the entire bandwidth of the spectrum).
Edwin H. Armstrong invented frequency-modulated (FM) radio, so that an audio signal can avoid "static," that is, interference from electrical equipment and atmospherics.
In 1878, David E. Hughes transmitted Morse code by radio at and below the super low frequency range (via a clockwork transmitter).
In 1888, Heinrich Hertz produced and measured the Ultra High Frequency range (via a sparkgap transmitter).
In 1891, Nikola Tesla began wireless research. He developed means to reliably produce radio frequencies, publicly demonstrated the principles of radio, and transmitted long-distance signals. He obtained a U.S. patent for the invention of the radio, as defined as "wireless transmission of data."
Between 1893 and 1894, Roberto Landell de Moura, a Brazilian priest and scientist, conducted experiments. He did not publicise his achievement until 1900 but later obtained Brazilian and American patents.
Alexander Stepanovich Popov, in 1894, built his first radio receiver, which contained a coherer. Further refined as a lightning detector, he presented it to the Russian Physical and Chemical Society on May 7, 1895.
Guglielmo Marconi was an early radio experimenter. He realised the first long distance transmissions and founded the first commercial organisation devoted to the development and use of radio
Reginald Fessenden and Lee de Forest invented amplitude-modulated (AM) radio, so that more than one station can send signals (as opposed to spark-gap radio, where one transmitter covers the entire bandwidth of the spectrum).
Edwin H. Armstrong invented frequency-modulated (FM) radio, so that an audio signal can avoid "static," that is, interference from electrical equipment and atmospherics.
The Ice hotel
The Ice hotel in Canada. This is a giant igloo situated in Mantmorency Fall park, just 20 minutes from downtown Quabec. It is made from 4.500 tons of snow and 20 tons of ice, and it takes 5 weeks to build. It stay open for three months. When the spring arrives, it will melt. Then it will be built again for next year-maybe in a different place. Each room is supplied with a sleeping bag made from deer skins. The hotel has two art galleries featuring ice scluptures, an ice space for weddings that looks beautiful, and an ice cinema. It also has a bar where all the drinks come in glasses made of ice. If you go there, I give you advice that you should take warm clothes, it is really cold, but I hope that one day I will visit the Ice hotel. It really looks amazing and it is very interesting. 
Life in 2050
During the twentieth century, cars, electric lights, space travel and amazing advances in medicine changed people's lives. So what might be happened and how the life is going to look in 2050? By my opinion by 2050 the school uniforms won't be around, both girls and boys will wear make-up more often, and more than 75% of man will wear skirts regularly. For example for my father birthday I should buy him a skirt for present and tell him that he is in fashion. By 2050 single man of working age will form more than 10% of all households. Washing powdera dverts will include more man in the future because more men will do more housework. You will need an electronic card to get into some parks as parents demands safe play areas for their children. Some parents might have cameras at home so they can keep an eye on the children, while they are out. Quick, kids turn off the TV and do your homework! All people will have money and will be happy. There will be not hungry and poor people around the world.
Subscribe to:
Posts (Atom)