نتایج جستجو برای: static magnetic fields

تعداد نتایج: 634821  

2012
S. A. Kiehas V. Angelopoulos A. Runov M. B. Moldwin C. Möstl

[1] On 21 October 2010, ARTEMIS spacecraft P2, located at about 57 REGSM in the Earth’s magnetotail, observed a series of flux ropes during the course of a moderate substorm. Subsequently, ARTEMIS spacecraft P1, located about 20 RE farther downtail and farther into the lobe than P2, observed a series of TCRs, consistent with the flux ropes observed by P2. The dual-spacecraft configuration allow...

Journal: :Physiological measurement 2007
A N Pavlov A N Tupitsyn A Legros A Beuter E Mosekilde

The influence of extremely low frequency magnetic fields (ELF-MFs) on human physiological processes and, in particular, on motor activity is still not established with certainty. Using the wavelet-transform approach, changes in the characteristics of human finger micromovement are studied in the presence of a low intensity MF centred at the level of the head. Different approaches to nonstationa...

2002
P John

With the help of scaling methods. a general relation is established between the thermodynamic pressure and the mechanical pressure tensor of an equilibrium one-component plasma in a magnetic field. The mechanical pressure tensor is shown lo be anisotropic. A general proof of the compressibility sum rule for a magnetized quantum plasma is presented. Finally, fourth-order wavenumber inequalities ...

2008
G. Lavagetto

We performed a timing analysis of the 2003 outburst of the accreting X-ray millisecond pulsar XTE J1807–294 observed by RXTE. Using recently refined orbital parameters we report for the first time a precise estimate of the spin frequency and of the spin frequency derivative. The phase delays of the pulse profile show a strong erratic behavior superposed to what appears as a global spin-up trend...

1999
P. Muggli C. Joshi

In the plasma beat wave acceleration scheme, the ponderomotive force of a two-frequency laser pulse resonantly drives a large amplitude (E≈3 GV/m) relativistic electrostatic plasma wave. The electro-static (es) wave does not couple to the vacuum modes and its energy is dissipated in the plasma. With a static magnetic field B0z applied perpendicularly to the laser beam propagation axis x, the tw...

Journal: :Philosophical transactions. Series A, Mathematical, physical, and engineering sciences 2004
Christiane R Timmel Kevin B Henbest

This paper reviews the latest developments in the field of spin chemistry with a particular focus on the effects of weak static and/or oscillating magnetic fields (typically smaller than the average hyperfine coupling) on radical recombination reactions. Anisotropic magnetic field effects and their significance in the debate about potential mechanisms controlling magnetoreception in birds are d...

2015
Zach Njus Douglas Feldmann Riley Brien Taejoon Kong Upender Kalwa Santosh Pandey

In nature, several organisms possess a magnetic compass to navigate or migrate them to desired locations. It is thought that these organisms may use biogenic magnetic matter or light-sensitive photoreceptors to sense and orient themselves in magnetic fields. To unravel the underlying principles of magnetosensitivity and magnetoreception, previous experiments have been conducted on bacteria, ver...

Journal: :The Journal of bone and joint surgery. British volume 1982
R E Steiner

Nuclear magnetic resonance (NMR) is a phenomenon in which particular atomic nuclei respond to the application of certain magnetic fields by absorbing or emitting electromagnetic radiation, a phenomenon which was first demonstrated by Bloch, Hansen and Packard in 1946. Its medical application was pioneered by Odeblad, a physicist from Sweden, during the l950s and 1960s (Odeblad and Lindstr#{246}...

Priming of seeds by magnetic fields (magneto priming) is proposed as an ecological, useful and low-priced method for improvement of seed germination and plant emergence. In order to evaluate the germination behavior of sesame seeds affected by magnetic fields, an experiment was conducted as a completely randomized design with 22 treatments (non-exposure to magnetic fields (control) and 21 magne...

Journal: :journal of sciences, islamic republic of iran 2011
p. davoudifar

cosmic rays (cr) travel at speeds essentially indistinguishable from the speed of light. however whilst travelling through magnetic fields, both regular and turbulent, they are delayed behind the light since they are usually charged particles and their paths are not linear. those delays can be so long that they are an impediment to correctly identifying sources which may be variable in time. fu...

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