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Topic Review
Phase Curve
In astronomy a phase curve describes the brightness of a reflecting body as a function of its phase angle. The brightness usually refers the object's absolute magnitude, which, in turn, is its apparent magnitude at a distance of astronomical unit from the Earth and Sun. The phase angle equals the arc subtended by the observer and the sun as measured at the body. The phase curve is useful for characterizing an object's regolith (soil) and atmosphere. It is also the basis for computing the geometrical albedo and the Bond albedo of the body. In ephemeris generation, the phase curve is used in conjunction with the distances from the object to the Sun and the Earth to calculate the apparent magnitude.
  • 620
  • 15 Nov 2022
Biography
Petr Beckmann
Petr Beckmann (November 13, 1924 – August 3, 1993) was a professor of electrical engineering who became a well-known advocate of libertarianism and nuclear power. Later in his life he challenged Albert Einstein's theory of relativity and other accepted theories in modern physics. In 1939, when Beckmann was 14, his family fled their home in Prague, Czechoslovakia to escape the Nazis. From 19
  • 402
  • 26 Dec 2022
Biography
Peter Woit
Peter Woit (/ˈwɔɪt/; born September 11, 1957) is an American theoretical physicist. He is a Senior Lecturer in the Mathematics department at Columbia University. Woit is a critic of string theory has published a book Not Even Wrong, and writes a blog of the same name.[1] Woit graduated in 1979 from Harvard University with bachelor's and master's degrees in physics. He obtained his PhD in p
  • 820
  • 01 Dec 2022
Biography
Peter Goldreich
Peter Goldreich (born July 14, 1939) is an United States astrophysicist whose research focuses on celestial mechanics, planetary rings, helioseismology and neutron stars.[1] He is currently the Lee DuBridge Professor of Astrophysics and Planetary Physics at California Institute of Technology. Since 2005 he has also been a professor at the Institute for Advanced Study in Princeton, New Jersey.[2]
  • 1.1K
  • 18 Nov 2022
Biography
Peter Clive Thonemann
Peter Clive Thonemann (3 June 1917 – 10 February 2018) was an Australian-born British physicist who was a pioneer in the field of fusion power while working in the United Kingdom . Thonemann was born in Melbourne and moved to Oxford University in 1944, becoming one of the earliest researchers on the topic of controlled fusion. He led the fusion research at Oxford in its early years, before mo
  • 367
  • 27 Dec 2022
Topic Review
Perturbative/Non-Perturbative Quantum Field Theory
In this review, we focused on the foundations of quantum field theory, which is still believed to be the most fundamental theory, describing in principle all phenomena observed in atomic and particle physics. Unlike quantum mechanics, however, its foundations are still not cleared up. We attempted to describe how some novel approaches lead to a unified picture, in spite of the fact that several difficult open problems remain.
  • 832
  • 20 Jul 2021
Topic Review
Perturbation
In astronomy, perturbation is the complex motion of a massive body subjected to forces other than the gravitational attraction of a single other massive body. The other forces can include a third (fourth, fifth, etc.) body, resistance, as from an atmosphere, and the off-center attraction of an oblate or otherwise misshapen body.
  • 625
  • 28 Oct 2022
Topic Review
Personal RF Safety Monitors
Electromagnetic field densitometers measure the exposure to electromagnetic radiation in certain ranges of the electromagnetic spectrum. This article concentrates on densitometers used in the telecommunication industry, which measure exposure to radio spectrum radiation. Other densitometers, like extremely low frequency densitometers which measure exposure to radiation from electric power lines, also exist. The major difference between a "Densitometer" and a "Dosimeter" is that a Dosimeter can measure the absorbed dose, which does not exist for RF Monitors. Monitors are also separated by "RF Monitors" that simply measure fields and "RF Personal Monitors" that are designed to function while mounted on the human body.
  • 514
  • 14 Oct 2022
Topic Review
Perseus
Perseus, a prominent constellation in the northern celestial hemisphere, is named after the legendary Greek hero known for slaying the monstrous Gorgon Medusa. Located near the celestial equator, Perseus is recognizable for its distinctive "W" shape formed by its brightest stars and is rich in fascinating deep-sky objects.
  • 485
  • 15 Mar 2024
Topic Review
Peroxisomal β-Oxidation
It is not paradoxical that what has been overlooked tends to be of great importance. Peroxisomes, the widely distributed organelles in the body, play irreplaceable roles in cellular metabolism, especially in fatty acid oxidation (FAO) and the generation and elimination of reactive oxygen species (ROS).
  • 4.5K
  • 15 Jul 2022
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