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Economics & Business
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Plasma Physics
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Materials Science
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Germany is working on legislation to enable the use of the much-discussed technology of underground carbon storage, a top government official said Thursday, adding that it is preferable to releasing carbon dioxide into the ...
Environment
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As semiconductor devices become ever smaller, researchers are exploring two-dimensional (2D) materials for potential applications in transistors and optoelectronics. Controlling the flow of electricity and heat through these ...
Nanomaterials
Jan 4, 2023
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Transitions are never easy. Sometimes they are underway, and we are unaware of them. When New York City transitioned away from a manufacturing to a service economy, we lost a million people and 500,000 manufacturing jobs. ...
Environment
Jan 4, 2023
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Metal oxides are a promising catalyst for photoelectrochemical (PEC) water splitting to produce hydrogen as alternative energy. However, their effectiveness is restricted at low voltage. A research team led by scholars from ...
Materials Science
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Using NASA's Fermi spacecraft, Chinese astronomers have investigated the variability and spectral behavior of gamma-ray flares in a distant blazar known as 3C 279. Results of the study, presented in a paper published in the ...
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Molecular & Computational biology
Jan 4, 2023
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The word "exotic" may not spark thoughts of uranium, but Tyler Spano's investigations of exotic phases of uranium are bringing new knowledge to the nuclear nonproliferation industry.
Materials Science
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40
In physics, energy (from the Greek ἐνέργεια - energeia, "activity, operation", from ἐνεργός - energos, "active, working") is a scalar physical quantity that describes the amount of work that can be performed by a force, an attribute of objects and systems that is subject to a conservation law. Different forms of energy include kinetic, potential, thermal, gravitational, sound, light, elastic, and electromagnetic energy. The forms of energy are often named after a related force.
Any form of energy can be transformed into another form, but the total energy always remains the same. This principle, the conservation of energy, was first postulated in the early 19th century, and applies to any isolated system. According to Noether's theorem, the conservation of energy is a consequence of the fact that the laws of physics do not change over time.
Although the total energy of a system does not change with time, its value may depend on the frame of reference. For example, a seated passenger in a moving airplane has zero kinetic energy relative to the airplane, but non-zero kinetic energy relative to the Earth.
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