نتایج جستجو برای: static magnetic fields

تعداد نتایج: 634821  

Journal: :iranian journal of medical physics 0
gholamreza hamzavi m.sc. in physiology, physiology dept., shiraz university of medical sciences, shiraz, iran karim rastegar associate professor, physiology dept., shiraz university of medical sciences, shiraz, iran asad-allah zarifkar associate professor, physiology dept., shiraz university of medical sciences, shiraz, iran mehdi movahedi instructor, medical physics dept., shiraz university of medical sciences, shiraz, iran

introduction: biological effects of magnetic fields have been investigated by scientists for many years and a vast amount of research using different frequencies and intensities have been performed on humans and laboratory animals. the results of these studies, which have mostly been done by applying high frequencies, have shown that electromagnetic fields are effective on structure and functio...

2013
J. J Godina Nava R. García Cantú L. Cañedo M. A. Rodríguez Segura G. Serrano R. Alvarado Álvarez F. Toledo Ramos

Effect of static magnetic fields on the peripheral blood mononuclear-like cells Superficies y vacío, In this article the role of static magnetic fields (SMF) in the generation of Ca 2+ currents in peripheral blood mononuclear-like cells (PBMLC) is described. Using the sensitivity of Ca 2+ channels and pumps to membrane potential and ion concentration we propose a method which uses the conductiv...

Journal: :Physical review letters 2004
Jason Maron Benjamin D G Chandran Eric Blackman

Using direct numerical simulations, we calculate the rate of divergence of neighboring magnetic-field lines in different types of strong magnetohydrodynamic turbulence. In the static-magnetic-field approximation, our results imply that tangled magnetic fields in galaxy clusters reduce the electron diffusion coefficient and thermal conductivity by a factor of approximately 5-10, relative to thei...

Journal: :Neuromodulation : journal of the International Neuromodulation Society 2014
Casto Rivadulla Guglielmo Foffani Antonio Oliviero

OBJECTIVE The application of transcranial static magnetic field stimulation (tSMS) in humans reduces the excitability of the motor cortex for a few minutes after the end of stimulation. However, when tSMS is applied in humans, the cortex is at least 2 cm away, so most of the strength of the magnetic field will not reach the target. The main objective of the study was to measure the strength and...

2006
Louis-S. Bouchard

Nuclear magnetic resonance and imaging in very low fields is fundamentally limited by untruncated concomitant gradients, which cause severe distortions in image acquisition and volume selection if the gradient fields are strong compared to the static field. In this paper, it is shown that gradient fields oscillating in quadrature can be used for spatial encoding in low fields and provide substa...

Journal: :Physical chemistry chemical physics : PCCP 2013
C J Wedge Jason C S Lau Kelly-Anne Ferguson Stuart A Norman P J Hore Christiane R Timmel

The purported effects of weak magnetic fields on various biological systems from animal magnetoreception to human health have generated widespread interest and sparked much controversy in the past decade. To date the only well established mechanism by which the rates and yields of chemical reactions are known to be influenced by magnetic fields is the radical pair mechanism, based on the spin-d...

2018
Irina Alexandra Paun Roxana Cristina Popescu Bogdan Stefanita Calin Cosmin Catalin Mustaciosu Maria Dinescu Catalin Romeo Luculescu

We designed, fabricated and optimized 3D biomimetic magnetic structures that stimulate the osteogenesis in static magnetic fields. The structures were fabricated by direct laser writing via two-photon polymerization of IP-L780 photopolymer and were based on ellipsoidal, hexagonal units organized in a multilayered architecture. The magnetic activity of the structures was assured by coating with ...

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