After two seasons of record-breaking lows, Antarctica's sea ice remains in dramatic decline, tracking well below any winter maximum levels observed since satellite monitoring began during the late 1970s.
Environment
Sep 26, 2023
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3
Einstein's theory of gravity—general relativity—has been very successful for more than a century. However, it has theoretical shortcomings. This is not surprising: the theory predicts its own failure at spacetime singularities ...
General Physics
Sep 25, 2023
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Solar energy will be an integral part of a more sustainable future, but with current technology, generating the amount of power needed in Colorado alone would require using roughly the land area of Denver.
Ecology
Sep 19, 2023
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107
Achieving photochemical upconversion in a solid state is a step closer to reality, thanks to a new technique that could unlock vital innovations in renewable energy, water purification and advanced health care.
Analytical Chemistry
Sep 18, 2023
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Using solar energy to drive the cleavage of C-X bonds in halogenated organic compounds to form C-H bonds can not only control environmental pollution but also achieve important organic conversion reactions.
Analytical Chemistry
Sep 15, 2023
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Significant hurdles lie ahead of the G20's renewable energy target agreed in New Delhi last weekend, but the ambitious goal is feasible, experts say.
Environment
Sep 15, 2023
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1
A team of researchers, led by a University of Hawai'i (UH) at Mānoa planetary scientist, discovered that high energy electrons in Earth's plasma sheet are contributing to weathering processes on the moon's surface and, importantly, ...
Astronomy
Sep 14, 2023
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94
Sunlight is an inexhaustible source of energy, and utilizing sunlight to generate electricity is one of the cornerstones of renewable energy. More than 40% of the sunlight that falls on Earth is in the infrared, visible and ...
Nanomaterials
Sep 13, 2023
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The sun and the sea—both abundant and free—are being harnessed in a unique project to create vertical sea farms floating on the ocean that can produce fresh water for drinking and agriculture.
Biotechnology
Sep 11, 2023
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Hydrogen is considered a clean and efficient energy carrier that will have broad applications in the future—as a fuel for cars, buses, for houses heating, or as an energy storage. However, it is currently mainly produced ...
Biotechnology
Sep 5, 2023
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24
Solar energy is the radiant light and heat from the Sun that has been harnessed by humans since ancient times using a range of ever-evolving technologies. Solar radiation along with secondary solar resources such as wind and wave power, hydroelectricity and biomass account for most of the available renewable energy on Earth. Only a minuscule fraction of the available solar energy is used.
Solar power provides electrical generation by means of heat engines or photovoltaics. Once converted, its uses are limited only by human ingenuity. A partial list of solar applications includes space heating and cooling through solar architecture, potable water via distillation and disinfection, daylighting, hot water, thermal energy for cooking, and high temperature process heat for industrial purposes.
Solar technologies are broadly characterized as either passive solar or active solar depending on the way they capture, convert and distribute sunlight. Active solar techniques include the use of photovoltaic panels and solar thermal collectors (with electrical or mechanical equipment) to convert sunlight into useful outputs. Passive solar techniques include orienting a building to the Sun, selecting materials with favorable thermal mass or light dispersing properties, and designing spaces that naturally circulate air.
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