News tagged with atomic level
Metadynamics technique offers insight into mineral growth and dissolution
By using a novel technique to better understand mineral growth and dissolution, researchers at the Department of Energy's Oak Ridge National Laboratory are improving predictions of mineral reactions and laying the groundwork ...
Jan 23, 2012 |
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A new class of electron interactions in quantum systems
Physicists at the University of New South Wales have observed a new kind of interaction that can arise between electrons in a single-atom silicon transistor.
Jan 23, 2012 |
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When will artificial molecular machines start working for us?
Physicist Richard Feynman in his famous 1959 talk, "Plenty of Room at the Bottom," described the precise control at the atomic level promised by molecular machines of the future. More than 50 years later, synthetic molecular ...
Nov 25, 2011 |
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Researchers determine how antibody recognizes key sugars on HIV surface
HIV is coated in sugars that usually hide the virus from the immune system. Newly published research reveals how one broadly neutralizing HIV antibody actually uses part of the sugary cloak to help bind to the virus. The ...
Medicine & Health / HIV & AIDS
Nov 23, 2011 |
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Hungary likely source of elevated radioactivity levels: IAEA
Elevated levels of the radioactive element iodine-131 that were detected in several nations have been identified as likely originating at a Hungarian research institute, nuclear authorities said Thursday.
Nov 17, 2011 |
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Chinese researchers tap GPU supercomputer for world's first simulation of complete H1N1 virus
Chinese researchers achieved a major breakthrough in the race to battle influenza by using NVIDIA Tesla GPUs to create the world's first computer simulation of a whole H1N1 influenza virus at the atomic level.
Nov 15, 2011 |
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Frogs skin gives researchers the hop on bacteria
Skin secretions found in Australian frogs may hold the key to designing powerful new antibiotics that are not prone to bacterial resistance in humans, say researchers.
Nov 09, 2011 |
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Putting artificial atoms on the clock
Around the turn of the century, scientists began to understand that atoms have discrete energy levels. Within the field of quantum physics, this sparked the development of quantum optics in which light is ...
Nov 07, 2011 |
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Radium 'likely cause' of Tokyo radiation hotspot
Japanese authorities believe radium was to blame for a radiation hotspot at a Tokyo supermarket, a local city office said on Tuesday, in another scare for a nation still on edge over Fukushima.
Nov 01, 2011 |
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Making sodium-ion batteries that are worth their salt
(PhysOrg.com) -- Although lithium-ion technology dominates headlines in battery research and development, a new element is making its presence known as a potentially powerful alternative: sodium.
Technology / Energy & Green Tech
Oct 25, 2011 |
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Oxygen inactivates the enzyme function in three phases: study
Scientists from the Faculty of Biology and Biotechnology at the RUB have published a report in the Journal of Biological Chemistry explaining why enzymes used for the production of hydrogen are so sensitive to oxygen. In col ...
Oct 12, 2011 |
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New equation predicts molecular forces in hydrophobic interactions
The physical model to describe the hydrophobic interactions of molecules has been a mystery that has challenged scientists and engineers since the 19th century. Hydrophobic interactions are central to explaining ...
Oct 11, 2011 |
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All that glitters is not gold
(PhysOrg.com) -- Researchers developing key new technology electronics like quantum computing or advanced detectors, as well as those studying basic material science and metal surface properties, often find ...
Sep 29, 2011 |
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Inside story: Chemical reactivity on the inner surface of single-walled carbon nanotubes
(PhysOrg.com) -- Historically, the interior surface of single-walled carbon nanotubes (SWNTs) has not been considered to be chemically reactive. Recently, however, researchers at the University of Nottingham School of Chemistry in the UK and the Ulm Un ...
Nanotechnology / Nanomaterials
Sep 15, 2011 |
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New record for measurement of atomic lifetime
Researchers at the Niels Bohr Institute have measured the lifetime of an extremely stable energy level of magnesium atoms with great precision. Magnesium atoms are used in research with ultra-precise atomic ...
Sep 07, 2011 |
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Perturbation theory (quantum mechanics)
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.
For more information about Perturbation theory (quantum mechanics), read the full article at
Wikipedia.
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