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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
  • 426
  • 24 Nov 2022
Biography
Frederick Haynes Newell
Frederick Haynes Newell (March 5, 1862 – July 5, 1932), First Director of the United States Reclamation Service, was born in Bradford, Pennsylvania. He graduated in 1885 from the Massachusetts Institute of Technology and after field experience in Colorado and other states was appointed on October 2, 1888, as Assistant Hydraulic Engineer of the United States Geological Survey, being the first a
  • 621
  • 16 Dec 2022
Biography
Frederick Stark Pearson
Frederick Stark Pearson (July 3, 1861 – May 7, 1915) was an United States electrical engineer and entrepreneur. Dr. Frederick Stark Pearson was the son of Ambrose and Hannah (Edgerly) Pearson. He graduated from Tufts University in 1883 with an A.M.B. and received an A.M.M. degree one year later. Previously, for one year (1879–80), he was instructor in chemistry in the Massachusetts Instit
  • 552
  • 09 Dec 2022
Biography
Frederick Terman
Frederick Emmons Terman (/ˈtɜːrmən/; June 7, 1900 – December 19, 1982) was an American professor and academic administrator. He is widely credited (together with William Shockley) as being the father of Silicon Valley.[1] Terman completed his undergraduate degree in chemistry and his master's degree in electrical engineering at Stanford University.[2] His father, Lewis Terman, a psychol
  • 731
  • 23 Nov 2022
Biography
Frederick W. Lander
Frederick William[1][2] Lander (December 17, 1821 – March 2, 1862) was a transcontinental United States explorer, general in the Union Army during the American Civil War, and a prolific poet. Lander was born in Salem, Massachusetts, the son of Edward and Eliza West Lander; his sister was the sculptor Louisa Lander. He was educated at Governor Dummer Academy, Phillips Academy, Andover and No
  • 480
  • 10 Nov 2022
Topic Review
Frédérique Constant
Frédérique Constant SA is a Swiss manufacture of luxury wristwatches based in Plan-les-Ouates, Geneva. It was acquired in 2016 by Citizen Holdings of Tokyo, Japan. The company was established in 1988 by Peter Stas and Aletta Stas-Bax (a Dutch married couple). Before the sale to Citizen, Frédérique Constant SA was owned by Union Horlogère Holding B.V., which also owned Alpina Watches International SA, and Ateliers deMonaco SA, and was, in turn, owned by Frédérique Constant Holding SA.
  • 1.4K
  • 24 Oct 2022
Topic Review
Free-Carrier-Depletion-Based Phase Shifter
Free-carrier-dispersion-based phase shifters are favored in the field of telecommunications and data centers due to their high modulation speed and low power consumption. Based on the working mechanism, free-carrier-dispersion-based phase shifters fall into three categories: carrier injection, carrier depletion, and carrier accumulation.
  • 656
  • 28 Sep 2022
Topic Review
Free-Space Path Loss
In telecommunication, the free-space path loss (FSPL) is the attenuation of radio energy between the feedpoints of two antennas that results from the combination of the receiving antenna's capture area plus the obstacle free, line-of-sight path through free space (usually air). The "Standard Definitions of Terms for Antennas", IEEE Std 145-1993, defines "free-space loss" as "The loss between two isotropic radiators in free space, expressed as a power ratio." It does not include any power loss in the antennas themselves due to imperfections such as resistance. Free space loss increases with the square of distance between the antennas because the radio waves spread out due the inverse square law and decreases with the square of the wavelength of the radio waves. The FSPL is rarely used standalone, but rather as a part of the Friis transmission formula, which includes the gain of antennas. It is a factor that must be included in the power link budget of a radio communication system, to ensure that sufficient radio power reaches the receiver that the transmitted signal is received intelligibly.
  • 22.6K
  • 02 Jun 2023
Topic Review
Freeway Traffic Breakdown Using Artificial Neural Networks
Traffic breakdown is the transition of traffic flow from an uncongested state to a congested state. On freeways, when a large number of on-ramp vehicles merge with mainline traffic, it can cause a significant drop in speed and subsequently lead to traffic breakdown. Therefore, ramp meters have been used to regulate the traffic flow from the ramps to maintain stable traffic flow on the mainline. However, existing traffic breakdown prediction models do not consider on-ramp traffic flow. An algorithm based on artificial neural networks (ANN) is developed to predict the probability of a traffic breakdown occurrence on freeway segments with merging traffic, considering temporal and spatial correlations of the traffic conditions from the location of interest, the ramp, and the upstream and downstream segments. 
  • 268
  • 27 Jul 2023
Topic Review
Freeze-Drying of Foods
Freeze-drying is a process in which water is sublimated by the direct transition of water from solid (ice) to vapor, thus omitting the liquid state, and then desorbing water from the “dry” layer.
  • 2.4K
  • 16 Nov 2020
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