Results 251 to 260 of about 221,077 (298)
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Full Spectral Decomposition of Ring Currents
The Journal of Physical Chemistry A, 2006Within the ipsocentric method for calculation of molecular magnetic response, projection of perturbed orbitals onto the virtual orbital space allows partition of induced current density into contributions from individual virtual excitations between occupied and unoccupied orbitals, enabling detailed assignment of the origin of currents in, e.g ...
Steiner E., Soncini A., Fowler P. W.
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Progress in Nuclear Magnetic Resonance Spectroscopy, 2000
BCS: Bardeen–Cooper–Schrieffer; BRE: bond resonance energy; CHF: coupled Hartree–Fock; CIS: complexation chemicalshifts; CM: centre of mass; CO: common origin; CPT: charge conjugation-parity inversion-time reversal; CSGT: continuous set of gaugetransformations; CSDGT: continuous set of damped gauge transformations; CTDOCD: continuous transformation of ...
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BCS: Bardeen–Cooper–Schrieffer; BRE: bond resonance energy; CHF: coupled Hartree–Fock; CIS: complexation chemicalshifts; CM: centre of mass; CO: common origin; CPT: charge conjugation-parity inversion-time reversal; CSGT: continuous set of gaugetransformations; CSDGT: continuous set of damped gauge transformations; CTDOCD: continuous transformation of ...
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Double Aromaticity and Ring Currents in All‐Carbon Rings
Chemistry – A European Journal, 2009AbstractDouble aromaticity of neutral, planar rings of carbon atoms is demonstrated through visualisation of the induced ring currents, mapped at the ipsocentric B3LYP/6‐31G(d)//B3LYP/6‐31G(d) level for species C6 to C30, with onset of delocalised current in the in‐plane π system at C10/C11.
Patrick W, Fowler +3 more
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Space Science Reviews, 2006
This chapter reviews the current understanding of ring current dynamics. The terrestrial ring current is an electric current flowing toroidally around the Earth, centered at the equatorial plane and at altitudes of ∼10,000 to 60,000 km. Enhancements in this current are responsible for global decreases in the Earth’s surface magnetic field, which have ...
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This chapter reviews the current understanding of ring current dynamics. The terrestrial ring current is an electric current flowing toroidally around the Earth, centered at the equatorial plane and at altitudes of ∼10,000 to 60,000 km. Enhancements in this current are responsible for global decreases in the Earth’s surface magnetic field, which have ...
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“Ring currents” static hypersusceptibilities
International Journal of Quantum Chemistry, 1980AbstractThe Hückel–London theory has been applied to the calculation of the “ring currents” octopole hypersusceptibilities of a series of conjugated compounds. Our calculations have been performed using fourth‐order Rayleigh–Schrödinger perturbation technique. This is believed to be the first calculation of this kind.
J. Gayoso +3 more
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Topological definition of ring currents
Physical Chemistry Chemical Physics, 2016A definition of ring currents in a velocity vector field is proposed according to topological criteria: ring currents are axial vortices confined in, or rotating beyond, a separatrix, i.e., the boundary which marks the limits of the vortex.
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Current status of contraceptive vaginal rings
Contraception, 2013Contraceptive vaginal rings (CVR) offer a new, effective contraceptive option, expanding the available choices of hormonal contraception. Various ring prototypes have been evaluated: progestin-only rings and combined progestin-estrogen rings, as well as different combination of progestins and estrogens.
Vivian, Brache +2 more
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Current inducting techniques for superconducting rings
Journal of Superconductivity, 2005A procedure has been developed to generate a persistent current in superconducting rings. The basis of the method is a magnetic circuit made of a permanent neodymium-iron-boron magnet and an iron core; the current induced in the superconductor comes only from the energy of the permanent magnet avoiding the power supply.
H. González-Jorge +3 more
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Mesoscopic persistent current in small rings
Physical Review B, 1993Small normal-metal rings threaded by a constant magnetic flux have been shown to carry a mesoscopic persistent current at low temperatures. The current is a few-electron effect and its sign and amplitude depend on the microscopic configuration of disorder. Assuming a Gaussian current distribution, we characterize the effect by three quantities, the rms
, Riedel, , von Oppen F
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Photoinduced Charge Currents in Mesoscopic Rings
Physical Review Letters, 2005The temporal and spatial controllability of charge distribution in submicron structures opens new avenues for potential applications and for the understanding of nonequilibrium processes. Here we suggest a novel way to trigger and control within picoseconds charge currents and magnetic moments in nanoscopic and mesoscopic ring structures by applying ...
A, Matos-Abiague, J, Berakdar
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