News tagged with atomic level
Japan firm unveils radiation-gauging smartphone
Mobile phone operator Softbank on Tuesday unveiled a smartphone that can measure radiation as consumers in Japan clamour for reassurance following last year's Fukushima nuclear disaster.
Electronics / Consumer & Gadgets
3 hours ago |
not rated yet |
0
A magnetic approach to lattices
(Phys.org) -- JQI experimentalists under the direction of Ian Spielman are in the business of using lasers to create novel environments for neutral atoms. For instance, this research group previously enticed ...
May 22, 2012 |
5 / 5 (4) |
0
|
Neutron scattering charts moves of memory-shape alloys that change structure in response to environmental cues
(Phys.org) -- Shape-memory alloys (SMAs) are an engineer's dream, able to shape-shift spontaneously to accommodate changing operating conditions. A research team from the National Aeronautics and Space Administration ...
May 09, 2012 |
5 / 5 (1) |
0
|
How heroin works: Imaging opioid receptors in the brain
(Phys.org) -- Researchers and doctors have gleaned new clues to the molecular mechanisms behind some of the most addictive substances in the world, thanks to two new studies that uncovered the structures of ...
Apr 25, 2012 |
5 / 5 (1) |
0
|
Metal oxides hold the key to cheap, green energy
Harnessing the energy of sunlight can be as simple as tuning the optical and electronic properties of metal oxides at the atomic level by making an artificial crystal or super-lattice 'sandwich' says a Binghamton ...
Nanotechnology / Nanomaterials
Apr 19, 2012 |
4.9 / 5 (10) |
0
|
Computer simulations suggest graphynes may be even more useful than graphene
(PhysOrg.com) -- The past several years have seen a virtual explosion in the amount of research dedicated to graphene and as a result there has been a nearly constant stream of news pertaining to new discoveries ...
Nanotechnology / Nanomaterials
Mar 05, 2012 |
4.8 / 5 (10) |
26
|
New picture of atomic nucleus emerges
(PhysOrg.com) -- When most of us think of an atom, we think of tiny electrons whizzing around a stationary, dense nucleus composed of protons and neutrons, collectively known as nucleons. A collaboration between ...
Mar 02, 2012 |
4.3 / 5 (29) |
14
|
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 |
5 / 5 (1) |
0
|
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 |
4.7 / 5 (15) |
0
|
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 |
3.8 / 5 (6) |
5
|
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 |
5 / 5 (2) |
0
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 |
not rated yet |
0
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 |
5 / 5 (1) |
0
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 |
not rated yet |
0
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 |
4.5 / 5 (6) |
1
|
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.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
