Rare earth elements, like neodymium and dysprosium, are a critical component to almost all modern technologies, from smartphones to hard drives, but they are notoriously hard to separate from the Earth's crust and from one ...
Materials Science
May 31, 2023
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37
Proton exchange membrane fuel cells (PEMFC) have attracted much attention because of high conversion efficiency, low environmental pollution, and high specific energy, which can be widely used in vehicles such as automobiles, ...
Analytical Chemistry
May 26, 2023
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5
A team of researchers at Duke University and their collaborators have uncovered the atomic mechanisms that make a class of compounds called argyrodites attractive candidates for both solid-state battery electrolytes and thermoelectric ...
Materials Science
May 22, 2023
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1696
A University of Minnesota Twin Cities-led team has developed a first-of-its-kind, breakthrough method that makes it easier to create high-quality metal oxide thin films out of "stubborn" metals that have historically been ...
Nanophysics
May 22, 2023
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98
No one will ever be able to see a purely mathematical construct such as a perfect sphere. But now, scientists using supercomputer simulations and atomic resolution microscopes have imaged the signatures of electron orbitals, ...
Nanophysics
May 15, 2023
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953
The rigidity, transparency and hardness of PET (Polyethylene Terephthalate) make it one of the most valuable plastics for the manufacture of plastic bottles, packaging and other single-use products. However, these characteristics ...
Biochemistry
May 12, 2023
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69
Two highly similar molecules with essential but often contrasting signaling roles in most life forms exert their distinct effects through subtle differences in their bindings to their signaling partners, according to a new ...
Cell & Microbiology
May 9, 2023
1
223
Inside a lab, scientists marvel at a strange state that forms when they cool down atoms to nearly absolute zero. Outside their window, trees gather sunlight and turn them into new leaves. The two seem unrelated—but a new ...
General Physics
May 3, 2023
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2564
Scientists have developed two new drug candidates for potentially treating addiction and depression, modeled on the pharmacology of a traditional African psychedelic plant medicine called ibogaine. At very low doses, these ...
Biochemistry
May 2, 2023
2
85
Excessive use of fossil energy causes global warming and other environmental problems. To reduce the greenhouse effect, two major greenhouse gases-CO2 and CH4 as the feedback are used to produce syngas (CO and H2) by CO2-CH4 ...
Analytical Chemistry
Apr 24, 2023
0
8
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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