Results 251 to 260 of about 983,829 (280)

PERCUTANEOUS ELECTRICAL STIMULATION IN STRENGTH TRAINING

Journal of Strength and Conditioning Research, 2005
Numerous studies have used percutaneous electrical stimulation (PES) in the context of training programs to develop strength and physical performance in healthy populations (sedentary or trained). Significant increases in muscle and fiber cross-sectional area, isokinetic peak torque, maximal isometric and dynamic strength, and motor performance skills ...
Bernardo, Requena Sánchez, Paulino, Padial Puche, Juan José, González-Badillo   +2 more
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Transportable Electric Field Strength Standard

Measurement Techniques, 2004
Results from a study of a transportable electric field strength standard are presented. A measurement formula for the standard in the form of a product of three functions, an amplitude function, a frequency function, and a correction function, is obtained.
V. I. Luk'yanov, A. A. Repko
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Electric strength of polymers

Journal of Physics D: Applied Physics, 1996
In the theory of electric strength, usually referred to as free-volume theory, breakdown is initiated by free electrons accelerated by electric field in the largest of the holes present in the amorphous phase of all polymers. In contrast to previous publications, the breakdown is treated as the final stage of the disproportionate rise of the electron ...
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The Electric Strength of Air

Transactions of the American Institute of Electrical Engineers, 1910
Air is the commonest and most widely used of insulators. Its insulating characteristics are remarkably good; it has low specific inductive capacity, very low conductivity, and an electric strength or resistance to rupture which until recently has met all the demands of the electrical engineer.
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Electric Field Strength Due to Electric Excitation

2000
We start with the modified Maxwell equations without electric and magnetic charges, having constant scalars for the permeability µ and the permittivity ϵ. The following equations apply to a medium at rest: $$curlH = \in \frac{{\partial E}}{{\partial t}} + {{g}_{e}}$$ (1) $$- curlE = \mu \frac{{\partial H}}{{\partial t}} + {{g}_{m ...
Henning F. Harmuth, Konstantin A. Lukin
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Nonsustained Breakdowns in Electrical Strength Tests

IEEE Transactions on Power Apparatus and Systems, 1966
A study of nonsustained breakdowns has been made during alternating voltage tests on the electric strength of various commercial insulants in transformer oil and compressed sulphur hexafluoride and nitrogen. Such breakdowns do not cause sustained arcing and current flow.
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The electric strength of copolymers

Journal of Materials Science, 1977
Careful measurements of the electric strength of styrene—butadiene copolymers together with their parent homopolymers over a wide range of temperature are presented. The marked reduction of strength characteristic of a non-polar amorphous material occurs at a temperature indistinguishable from the glass transition temperature determined by differential
H. Sabuni, J. K. Nelson
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Electric Strength of Irradiated Polythene

Nature, 1955
THE electric strength of irradiated polythene has been measured for material cross-linked by exposure to 4-MeV. electrons from a linear accelerator. Thin (1-mm.) moulded disks of material (average molecular weight, 17,000) recessed to a thickness of about 50 microns were irradiated in vacuo with doses of 150–300 Mrad , and the electric strength ...
K. H. STARK, C. G. GARTON
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Mechanical prestressing improves electrical strength

IEEE Electrical Insulation Magazine, 2002
There is a strong mechanical influence on the growth of electrical trees in electrical insulation resins. This is not to argue that electrical treeing is exclusively a mechanical phenomenon directly analogous to mechanical cracking. It is obviously an electrically driven process; no volts, no trees.
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Electric strength of transformer insulation

Proceedings of the Institution of Electrical Engineers, 1969
High-voltage power transformers incorporate large quantities of insulation which is easily contaminated, and the dielectric strength is, in consequence, uncertain. This paper reports the results of electric-strength tests on transformer oil, alone and in combination with solid insulation, under various conditions.
S. Palmer, W.A. Sharpley
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