Heliocentrism is the astronomical model in which the Earth and planets revolve around the Sun at the center of the universe. Historically, heliocentrism was opposed to geocentrism, which placed the Earth at the center. The notion that the Earth revolves around the Sun had been proposed as early as the third century BC by Aristarchus of Samos, who had been influenced by a concept presented by Philolaus of Croton (c. 470 – 385 BC). In the 5th century BC the Greek Philosophers Philolaus and Hicetas had the thought on different occasions that the Earth was spherical and revolving around a "mystical" central fire, and that this fire regulated the universe. In medieval Europe, however, Aristarchus' heliocentrism attracted little attention—possibly because of the loss of scientific works of the Hellenistic period.
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Study suggests that no restrictions are needed for the use of high-power vehicle chargers by people with implanted cardiac devices.
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Researchers in South Korea have developed a new way of mass-producing large metalenses that could find use in virtual-reality displays.
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In nuclear physics and particle physics, isospin (I) is a quantum number related to the up- and down quark content of the particle. More specifically, isospin symmetry is a subset of the flavour symmetry seen more broadly in the interactions of baryons and mesons.
The name of the concept contains the term spin because its quantum mechanical description is mathematically similar to that of angular momentum (in particular, in the way it couples; for example, a proton–neutron pair can be coupled either in a state of total isospin 1 or in one of 0). But unlike angular momentum, it is a dimensionless quantity and is not actually any type of spin.
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The name of the concept contains the term spin because its quantum mechanical description is mathematically similar to that of angular momentum (in particular, in the way it couples; for example, a proton–neutron pair can be coupled either in a state of total isospin 1 or in one of 0). But unlike angular momentum, it is a dimensionless quantity and is not actually any type of spin.
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The Indian Space Research Organisation (ISRO) on May 29 successfully placed the NVS-01 navigation satellite, weighing about 2232 kg, into Geosynchronous Transfer Orbit. This Geosynchronous Satellite Launch Vehicle (GSLV) which placed the satellite, lifted off with a thunderous roar precisely at 10.42 a.m. from the second launch pad at the Satish Dhawan Space Centre SHAR, Sriharikota.
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Physicists in the US have discovered a laser-based “switch” that turns a sample of ions completely transparent at certain frequencies.
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Ion implantation is a low-temperature process by which ions of one element are accelerated into a solid target, thereby changing the physical, chemical, or electrical properties of the target. Ion implantation is used in semiconductor device fabrication and in metal finishing, as well as in materials science research. The ions can alter the elemental composition of the target (if the ions differ in composition from the target) if they stop and remain in the target. Ion implantation also causes chemical and physical changes when the ions impinge on the target at high energy. The crystal structure of the target can be damaged or even destroyed by the energetic collision cascades, and ions of sufficiently high energy (tens of MeV) can cause nuclear transmutation.
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Theorists say that palladates – oxide materials based on the element palladium – could be used to make superconductors that work at higher temperatures than cuprates or nickelates.
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Perovskite-based solar cells have been going from strength to strength lately. Here's a quick round-up of recent developments in the field.
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Physicists have made the first direct measurement of a thorium-229 nuclear transition that could potentially form the basis for a “nuclear clock”.
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A brain–spine interface that provides a "digital bridge" between the brain and spinal cord helped an individual with paralysis to walk naturally.
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