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Topic Review
Windmill (Sailing Dinghy)
The Windmill is an American sailing dinghy that was designed by Clark Mills as a one-design racer and first built in 1953. The Windmill hull design was developed into the US1 single-handed catboat in 1974.
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  • 24 Nov 2022
Topic Review
Scanner (Radio)
A scanner (also referred to a police scanner, police scanner radio or radio scanner) is a radio receiver that can automatically tune, or scan, two or more discrete frequencies, stopping when it finds a signal on one of them and then continuing to scan other frequencies when the initial transmission ceases. The terms radio scanner or police scanner generally refer to a communications receiver that is primarily intended for monitoring VHF and UHF landmobile radio systems, as opposed to, for instance, a receiver used to monitor international shortwave transmissions. More often than not, these scanners can also tune to different types of modulation as well (AM, FM, WFM, etc.). Early scanners were slow, bulky, and expensive. Today, modern microprocessors have enabled scanners to store thousands of channels and monitor hundreds of channels per second. Recent models can follow trunked radio systems and decode APCO-P25 digital transmissions. Both hand held and desktop models are available. Scanners are often used to monitor police, fire and emergency medical services. Radio scanning serves an important role in the fields of journalism and crime investigation, as well as a hobby for many people around the world.
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Topic Review
Boiling Water Reactor
A boiling water reactor (BWR) is a type of light water nuclear reactor used for the generation of electrical power. It is the second most common type of electricity-generating nuclear reactor after the pressurized water reactor (PWR), which is also a type of light water nuclear reactor. The main difference between a BWR and PWR is that in a BWR, the reactor core heats water, which turns to steam and then drives a steam turbine. In a PWR, the reactor core heats water, which does not boil. This hot water then exchanges heat with a lower pressure system, which turns water into steam that drives the turbine. The BWR was developed by the Argonne National Laboratory and General Electric (GE) in the mid-1950s. The main present manufacturer is GE Hitachi Nuclear Energy, which specializes in the design and construction of this type of reactor.
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Topic Review
List of Tall Ships
A list of tall ships afloat as of March 2012, listed alphabetically by vessel name:
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Topic Review
Quadjet
A quadjet or four-engine jet is a jet aircraft powered by four engines. The presence of four engines offers increased power output and redundancy, allowing quadjets to be used as civilian airliners, freighters and military aircraft. Many of the first purpose-built jetliners were quadjets, among which stands the De Havilland Comet, the world's first commercial jetliner. In the past two decades, the use of quadjet airliners has gradually begun to decline due to a variety of factors, including the approval of twinjets to fly further from diversion airports and an increased emphasis on fuel efficiency.
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  • 24 Nov 2022
Topic Review
Ghazal
The ghazal (Bengali: গজল, Sylheti: ꠊꠏꠟ, Punjabi: ਗ਼ਜ਼ਲ, Urdu: غزَل , Hindi: ग़ज़ल, Persian: غزل‎, Azerbaijani: qəzəl, Turkish: gazel, Uzbek: gʻazal, Pashto: غزل‎, Template:Lang-gu,) is a form of amatory poem or ode, originating in Arabic poetry. A ghazal may be understood as a poetic expression of both the pain of loss or separation and the beauty of love in spite of that pain. The ghazal form is ancient, tracing its origins to 7th-century Arabic poetry. The ghazal spread into South Asia in the 12th century due to the influence of Sufi mystics and the courts of the new Islamic Sultanate, and is now most prominently a form of poetry of many languages of the Indian subcontinent and Turkey. A ghazal commonly consists of between five and fifteen couplets, which are independent, but are linked – abstractly, in their theme; and more strictly in their poetic form. The structural requirements of the ghazal are similar in stringency to those of the Petrarchan sonnet. In style and content, due to its highly allusive nature, the ghazal has proved capable of an extraordinary variety of expression around its central themes of love and separation.
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  • 24 Nov 2022
Biography
Clemens Herschel
Clemens Herschel (March 23, 1842 – March 1, 1930) was an American hydraulic engineer. His career extended from about 1860 to 1930, and he is best known for developing the Venturi meter, which was the first large-scale, accurate device for measuring water flow.[1][2] Clemens was born in Vienna in 1842. His family immigrated to Davenport, Iowa in 1850. He spent most of his life practicing his
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Biography
Kenneth Hess
Kenneth Lafferty Hess (born January 22, 1953) is an engineer, author, entrepreneur, and philanthropist. Hess is founder and president of Science Buddies, a non-profit organization dedicated to furthering science literacy through the creation of free resources and services for K-12 students, teachers, and families. He holds one of the first software patents ever granted[1] and has designed and/or
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  • 24 Nov 2022
Biography
Frederick Hauck
Frederick Hamilton "Rick" Hauck (pronounced "Howk"; born April 11, 1941) is a retired Captain in the United States Navy, a former fighter pilot and NASA astronaut. He piloted Space Shuttle mission STS-7 and commanded STS-51-A and STS-26. He was born April 11, 1941 in Long Beach, California, but considers Winchester, Massachusetts and Washington, D.C. to be his hometowns. His parents were the
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  • 24 Nov 2022
Biography
James S. Voss
James Shelton Voss (born March 3, 1949) is a retired United States Army Colonel and NASA astronaut. During his time with NASA, Voss flew in space five times on board the Space Shuttle and International Space Station. He also served as deputy of Flight Operations for the Space Station Program Mission Integration and Operations Office. While participating in ISS Expedition 2, he and Susan Helms co
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