Engineering
Using neutrons to see the additive manufacturing process at the atomic level, scientists have shown that they can measure strain in a material as it evolves and track how atoms move in response to stress.
Oct 16, 2023
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178
Energy & Green Tech
Researchers at the U.S. Department of Energy's National Renewable Energy Laboratory (NREL) and Colorado School of Mines are applying a new technique to identify defects in silicon solar cells that cause a drop in efficiency. ...
Oct 19, 2021
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1732
Computer Sciences
Researchers have found a way to use chaos to help develop digital fingerprints for electronic devices that may be unique enough to foil even the most sophisticated hackers.
Apr 7, 2021
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341
Energy & Green Tech
Nanoengineers at the University of California San Diego have discovered new fundamental insights for developing lithium metal batteries that perform well at ultra-low temperatures; mainly, that the weaker the electrolyte ...
Feb 25, 2021
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45
Engineering
Researchers in the Andrew and Erna Viterbi Faculty of Electrical and Computer Engineering at the Technion in Israel have demonstrated control over an emerging material, which they consider as a possible future alternative ...
Jul 13, 2023
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31
Engineering
A team lead by Professor Simon Brown at the University of Canterbury (UC) has developed computer chips with brain-like functionality, that could significantly reduce global carbon emissions from computing.
Nov 6, 2019
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56
Energy & Green Tech
Perovskite is a promising material. It captures the sun's rays and efficiently converts them into solar energy. It is also much cheaper than the current generation of silicon solar cells. But why are the Dutch rooftops not ...
Oct 14, 2021
1
11
Engineering
In circuitry, etching is used to remove the deformed layer created during the grinding and polishing of metal components by selective chemical reactions. Now, a research group at Nagoya University in Japan has developed a ...
Feb 22, 2023
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51
Electronics & Semiconductors
One of the first sights greeting visitors to Pacific Northwest National Laboratory's (PNNL's) Energy Sciences Center are windows into busy lab spaces. Filled with equipment and researchers going about their work, the film ...
Mar 22, 2023
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17
Energy & Green Tech
The smartphone era is only just over a decade old, but the pocket-sized computers at the heart of that societal transformation are only really possible because of another technology: lithium-ion batteries.
Jul 15, 2019
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1
In quantum mechanics, perturbation theory is a set of approximation schemes directly related to mathematical perturbation for describing a complicated quantum system in terms of a simpler one. The idea is to start with a simple system for which a mathematical solution is known, and add an additional "perturbing" Hamiltonian representing a weak disturbance to the system. If the disturbance is not too large, the various physical quantities associated with the perturbed system (e.g. its energy levels and eigenstates) can, from considerations of continuity, be expressed as 'corrections' to those of the simple system. These corrections, being 'small' compared to the size of the quantities themselves, can be calculated using approximate methods such as asymptotic series. We can therefore study the complicated system based on our knowledge of the simpler one.
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