A new solar-radiation-concentrating device produces “green” hydrogen at a rate of more than 2 kW while maintaining efficiencies above 20%.
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🌠 WHY ASTEROIDS HAVE IRREGULAR SHAPES BUT PLANETS ARE SPHERICAL ❔
🌐 Gravity shapes the planets into a spherical shape because it pulls the body equally in all directions. But during the formation period, everything was at molten state and asteroids froze quickly because of their small size, so gravity didn't get longer to shape it.
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Magnetohydrodynamics (MHD; also called magneto-fluid dynamics or hydromagnetics) is the study of the magnetic properties and behaviour of electrically conducting fluids. Examples of such magnetofluids include plasmas, liquid metals, salt water, and electrolytes. The word magnetohydrodynamics is derived from magneto- meaning magnetic field, hydro- meaning water, and dynamics meaning movement. The field of MHD was initiated by Hannes Alfvén, for which he received the Nobel Prize in Physics in 1970.
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Researchers in Singapore and China have devised an artificial retina device for the perception and recognition of objects emitting mid-infrared radiation.
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A swallowable X-ray dosimeter the size of a large pill capsule can monitor gastrointestinal radiotherapy in real time.
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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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