Search
Now showing items 6621-6640 of 7379
Beyond the standard IAU framework
(Cambridge university Press, 2010)
We discuss three conceivable scenarios of extension and/or modification of the IAU relativistic resolutions on time scales and spatial coordinates beyond the Standard IAU Framework. These scenarios include: (1) the formalism ...
Units of relativistic time scales and associated quantities
(arXiv, 2010)
This note suggests nomenclature for dealing with the units of various astronomical quantities that are used with the relativistic time scales TT, TDB, TCB and TCG. It is suggested to avoid wordings like "TDB units" and "TT ...
On the two approaches to the data analysis of the Cassini interplanetary relativity experiment
(Elsevier, 2009)
We compare two theoretical approaches to the data analysis of the Cassini relativity experiment based on the Doppler tracking and the time delay technique that were published correspondingly by Kopeikin et al. [S.M. Kopeikin, ...
Stability of pulsar rotational and orbital periods
(arXiv, 2009)
Millisecond and binary pulsars are the most stable astronomical standards of frequency. They can be applied to solving a number of problems in astronomy and time-keeping metrology including the search for a stochastic ...
Non-Fermi-liquid behavior in Ce(Ru1‑xFex)2Ge2 : Cause and effect
(American Physical Society, 2006)
We present inelastic neutron scattering measurements on the intermetallic compounds Ce(Ru1−xFex)2Ge2 (x=0.65, 0.76, and 0.87). These compounds represent samples in a magnetically ordered phase, at a quantum critical point, ...
The dynamics of superfluid 4He
(arXiv, 2006)
We present neutron scattering results for the dynamic response by superfluid and normal-fluid 4He and the results of a simple perturbation-theory analysis which allows us to describe all aspects of the observed behavior ...
Lorentz shear modulus of fractional quantum Hall states
(Institute of Physics, 2009)
We show that the Lorentz shear modulus of macroscopically homogeneous electronic states in the lowest Landau level is proportional to the bulk modulus of an equivalent system of interacting classical particles in the ...
Beating of Friedel oscillations induced by spin-orbit interaction
(American Physical Society, 2010)
By exploiting our recently derived exact formula for the Lindhard polarization function in the presence of Bychkov-Rashba (BR) and Dresselhaus (D) spin-orbit interaction (SOI), we show that the interplay of different SOI ...
On the relation between the scalar and tensor exchange-correlation kernels of the time-dependent density-functional theory
(arXiv, 2010)
The scalar $f_{xc}$ and tensor $\hat{f}_{xc}$ exchange-correlation (xc) kernels are key ingredients of the time-dependent density functional theory and the time-dependent current density functional theory, respectively. ...
Was the need to produce pesticides higher than need to protect civilians?
(Rhetoric and Composition Program, University of Missouri--Columbia, 2010)
Your blood turns cold. Your eyes become blind. Panic hits and all of a sudden air won't enter your lungs quite as easily. In the dead of the night of December 3rd, a noise resembling the pain of thousands of people was ...
Spin Drag and Spin-Charge Separation in Cold Fermi Gases
(American Physical Society, 2007)
Low-energy spin and charge excitations of one-dimensional interacting fermions are completely decoupled and propagate with different velocities. These modes, however, can decay due to several possible mechanisms. In this ...
Phase Diagram of the Spin Hall Effect
(American Physical Society, 2008)
We obtain analytic formulas for the frequency-dependent spin-Hall conductivity of a two-dimensional electron gas (2DEG) in the presence of impurities, linear spin- orbit Rashba interaction, and external magnetic field ...
Fracture pain relief for kids? Ibuprofen does it better
(Family Physicians Inquiries Network, 2010)
Use ibuprofen instead of acetaminophen with codeine for pediatric arm fractures. It controls the pain at least as well and is better tolerated. Stength of recommendation: A: Based on 1 longer-term and 2 short-term randomized ...
Does lowering a fever >101F in children improve clinical outcomes?
(Family Physicians Inquiries Network, 2010)
Treating fever significantly increases comfort, activity, feeding, and fluid intake and decreases the patient's temperature compared with placebo (strength of recommendation (SOR): A, multiple randomized controlled trials ...
Spin-Polarized Two-Dimensional Electron Gas at Oxide Interfaces
(American Physical Society, 2008)
The possibility of formation of a fully spin-polarized 2D electron gas at the SrMnO3/(LaMnO3)1/ SrMnO3 heterostructure is predicted from density-functional calculations. The La(d) electrons become confined in the direction ...
Photoinduced magnetism in the ferromagnetic semiconductors
(arXiv, 2009)
We study the enhancement of the magnetic transition temperature $T_c$ due to incident light in ferromagnetic semiconductors such as EuS. The photoexcited carriers mediate an extra ferromagnetic interaction due to the ...
Soils : to be or not to be ... on campus
(Rhetoric and Composition Program, University of Missouri--Columbia, 2010)
Soil erosion causes harm on and off-site. On-site impacts are confined to the local area where as the damages caused by off-site impacts are felt by society at large. The most harmful on-site impact is the actual loss of ...
Investigation of the presence of charge order in magnetite by measurement of the spin wave spectrum
(American Physical Society, 2006)
Inelastic neutron scattering results on magnetite (Fe3O4) show a large splitting in the acoustic spin wave branch, producing a 7 meV gap midway to the Brillouin zone boundary at q=(0,0,1∕2) and ℏω=43 meV. The splitting ...
Nanoscale Observation of Alkane Delayering
(arXiv, 2006)
Noncontact Atomic Force Microscopy and synchrotron x-ray scattering measurements on dotriacontane (n-C32H66 or C32) films adsorbed on SiO2-coated Si(100) wafers reveal a narrow temperature range near the bulk C32 melting ...
The Production and Price Impact of Biotech Corn, Canola, and Soybean Crops
(AgBioForum, 2010)
Biotech crops have now been grown commercially on a substantial global scale since 1996. This article examines the production effects of the technology and impacts on cereal and oilseed markets through the use of agricultural ...