Research shows how common plastics could passively cool and heat buildings with the seasons
Researchers at Princeton and UCLA have developed a passive mechanism to cool buildings in the summer and warm them in the winter.
Jun 27, 2024
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54
Energy & Green Tech
Researchers at Princeton and UCLA have developed a passive mechanism to cool buildings in the summer and warm them in the winter.
Jun 27, 2024
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54
Energy & Green Tech
Norway wastes huge amounts of energy. Surplus heat produced by industry is hardly exploited at all.
Jun 27, 2024
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14
Energy & Green Tech
The desert city of Sedona, Arizona, is home to less than 10,000 people but welcomes nearly 3 million visitors every year. The city knows it needs a big boost to its electric vehicle (EV) charging infrastructure to support ...
Jun 27, 2024
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1
Robotics
Engineers at The University of Manchester have unlocked the secrets to designing a robot capable of jumping 120 meters—higher than any other jumping robot designed to date.
Jun 18, 2024
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100
Business
Bay Area tech layoffs jumped during the last three months and soared to their highest quarterly totals in over a year, an ominous sign the crucial sector's wrenching cutbacks have yet to run their course.
Jul 4, 2024
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23
Energy & Green Tech
Harnessing energy from nuclear fusion—the combining of nuclei, which lie within atoms—could be instrumental in the shift towards a decarbonized global energy system. As issues of climate change and energy security are ...
Jul 8, 2024
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19
Energy & Green Tech
High energy density is a crucial direction for future battery development. Lithium-sulfur (Li-S) batteries, with their high theoretical energy density, have garnered significant attention. However, the slow solid-liquid-solid ...
Jun 28, 2024
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7
Energy & Green Tech
UChicago Pritzker Molecular Engineering Prof. Y. Shirley Meng's Laboratory for Energy Storage and Conversion has created the world's first anode-free sodium solid-state battery.
Jul 3, 2024
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71
Electronics & Semiconductors
Solar energy is critical for a clean-energy future. Traditionally, solar energy is harvested using silicon—the same semiconductor material used in everyday electronic devices. But silicon solar panels have drawbacks: for ...
Jul 10, 2024
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27
Energy & Green Tech
In recent years, engineers have introduced a wide range of photovoltaic (PV) solutions that could facilitate the sustainable generation of electricity worldwide. These include organic solar cells (OSCs), PV devices that use ...
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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