Radio frequency

magnets and radio waves to create detailed digital images of the human body. The patient lies inside a massive hollowed out magnet and whilst inside the patient is exposed to short ionising bursts of non-ionising radio wave energy and the patient is exposed to these while inside the magnetic field created by sending…

Magnetic resonance imaging, also known as an MRI scan, is a type of scan that uses magnetic fields and radio wave energy to create images of the organs and tissues, such as the brain. It is a scan that is used to detect things such as tumors, infections and injuries. It is often used after an x-ray or CT scan is done to gather more information. This paper will discuss MRI in depth such as how an MRI works, its use in society, the differences between MRI and other scans and the future for MRI.…

actually cross the distance when combined with other signals. Second, these frequencies aren’t competing with RF output created by the solar and Jovian electromagnetic fields. So the military radar signals from the Cold War looking for incoming ICBMs are still traveling through space and stand out to any aliens listening on those frequencies. Air traffic radar, military radar and similar applications are still using these frequencies, too, so our planet continues to radiate them. Take this in…

was crucial in the development of frequency hopping technology that is used in military communications, Wi-Fi, as well as many other devices which had various users occupying the same radio frequency. This article written by Peter Hong narrates the life of Hedy Lamarr, the actress and inventor, going into great detail about her contributions to technology. The author explains how Mrs. Lamarr partnered with Mr. Antheil to produce a device that would allow U.S. radio-guided torpedoes avoid enemy's…

something called frequency-hopping, which would be used in many different devices to help us with everything from keep our country safe, to allowing us to access the Internet almost everywhere we go. Eventually, she got a patent, when she used frequency-hopping to invent a radio-controlled torpedo. Although the Navy took the patent, They neither rewarded her, nor credited her for her inventions. This led to Hedy Lamar mostly being known for her looks and as an actress,…

Describe the development of single dish radio telescopes and advantages of radio interferometers. Discuss major discoveries that were possible after detection of radio waves from space and how they changed our understanding of Universe. Astronomy is all about increasing our understandings about our Universe through observing objects like stars, galaxies and other bodies which exist outside Earth’s atmosphere. Astronomers make observations of these celestial phenomena by collecting…

magnetic resonance imaging exploits the magnetics properties of the nucleus. 2. Sound waves are longitudinal waves and they produce alternately states of compression and rare fraction at a point in a medium. Therefore when two sound waves of equal frequency travel simultaneously in a medium in the same direction then at some idea both waves produce compression that is they meet in the same place. At these points the amplitude is equal to the sum of the amplitudes for the two waves and the…

had a dream to make a big change in the world and that led him to be a man to use his intelligence to invent the world’s most important inventions such as power generator (AC System) and planting it in Niagara Falls, high frequency and Tesla Coil, which led him to invent the radio, and then this idea was stolen by another man whose name was Guglielmo Marconi. Nikola Tesla was born in Croatia and spent his early life with his family. His mother was Djuka Mandic, who inspired him to be a big…

this paper, we will discuss the cellular concept for GSM and its system architecture. Furthermore, KISS 16V2 an ASIC DSP implementation for GSM is being introduced and the test results have been discussed. Index Terms— GSM, ASIC, DSP, KISS 16V2, Frequency re-use, frame structure, I. INTRODUCTION L ong distance communications had always been an issue due to lack of communication standards. Before GSM networks were established, people used to communicate…

was a good actor and a beautiful woman. She tried acting in many places but she got homesick and returned to Vienna. Where she continued acting and was seen by many producers. Hedy Lamar invented the Secret Communications System which changed radio frequencies at irregular intervals between transmission and reception. This made an unbreakable code for messages so enemies can’t read them. This invention was put on many naval ships during the Cuban Missile Crisis. It was later put on many other…