نتایج جستجو برای: static magnetic fields

تعداد نتایج: 634821  

2000
Christian Y. Cardall Madappa Prakash James M. Lattimer

We study static neutron stars with poloidal magnetic fields and a simple class of electric current distributions consistent with the requirement of stationarity. For this class of electric current distributions, we find that magnetic fields are too large for static configurations to exist when the magnetic force pushes a sufficient amount of mass offcenter that the gravitational force points ou...

Journal: :The Journal of neuroscience : the official journal of the Society for Neuroscience 2003
Thomas A Houpt David W Pittman Jan M Barranco Erin H Brooks James C Smith

Advances in magnetic resonance imaging are driving the development of more powerful and higher-resolution machines with high-strength static magnetic fields. The behavioral effects of high-strength magnetic fields are largely uncharacterized, although restraint within a 9.4 T magnetic field is sufficient to induce a conditioned taste aversion (CTA) and induce brainstem expression of c-Fos in ra...

2018
Jian Zhang Zhaofeng Ding Cheng Tan Kevin Huang Oscar O Bernal Pei-Chun Ho Gerald D Morris Adrian D Hillier Pabitra K Biswas Stephen P Cottrell Hui Xiang Xin Yao Douglas E MacLaughlin Lei Shu

The origin of the pseudogap region below a temperature T* is at the heart of the mysteries of cuprate high-temperature superconductors. Unusual properties of the pseudogap phase, such as broken time-reversal and inversion symmetry are observed in several symmetry-sensitive experiments: polarized neutron diffraction, optical birefringence, dichroic angle-resolved photoemission spectroscopy, seco...

1998
Eric W. Davis

Space flight by means of wormholes is described whereby the traditional rocket propulsion approach can be abandoned in favor of a new paradigm involving the manipulation of spacetime. Maccone (1995) extended LeviCivita’s 1917 magnetic gravity solution to the Morris and Thorne (1988) wormhole solution and claimed that static homogeneous magnetic/electric fields can create spacetime curvature man...

Journal: :Food technology and biotechnology 2015
Jasmina Filipič Barbara Kraigher Brigita Tepuš Vanja Kokol Ines Mandić-Mulec

Ammonium removal is a key step in biological wastewater treatment and novel approaches that improve this process are in great demand. The aim of this study is to test the hypothesis that ammonium removal from wastewater can be stimulated by static magnetic fields. This was achieved by analysis of the effects of static magnetic field (SMF) on the growth and activity of Nitrosomonas europaea, a k...

2007
Philip Chadwick

This report describes the results of an investigation of operator exposure to static and switched­gradient fields from magnetic resonance imaging (MRI) systems. The project involves both computational modelling and the measurement of personal exposure using dedicated magnetic field dosemeters. The work was undertaken by Professor Stuart Crozier of the University of Queensland acting as an MCL c...

Journal: :Physical review. D, Particles and fields 1993
Pisarski

Using a program of perturbative resummation I compute the damping rates for fields at nonzero spatial momentum to leading order in weak coupling in hot QCD. Sum rules for spectral densities are used to simplify the calculations. For massless fields the damping rate has an apparent logarithmic divergence in the infrared limit, which is cut off by the screening of static magnetic fields (“magneti...

2011
E. Nazarova

I-V characteristics of polycrystalline Y1-xCaxBa2Cu3O7samples (x=0.025 and 0.20) have been measured at different temperatures and magnetic fields in the range 0.1 T-6.9 T. The scaling behavior has been established for both samples at all magnetic fields. The dynamic exponent z displays some morphology dependence with higher value for small grain size sample Y0.8Ca0.2Ba2Cu3O7. The static exponen...

Journal: :Occupational and environmental medicine 1995
B E Moen P A Drabløs S Pedersen M Sjøen G Thommesen

OBJECTIVE The study was performed to examine the influence of the exposure to magnetic fields in the potrooms of an electrolysis plant on the occurrence of musculoskeletal symptoms among the employees. The study was performed after much discussion and worry in the aluminium industry about this issue. METHODS A retrospective cohort study was performed at an aluminium plant. The occurrence of m...

2007
P T Leung

The singularity of the exact electromagnetic fields is derived to include the ‘source terms’ for harmonically oscillating electric (and magnetic) dipoles, so that the fields will be consistent with the full Maxwell equations with a source. It is shown explicitly, as somewhat expected, that the same δ-function terms for the case of static dipole fields will have to be included in the dynamic cas...

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