نتایج جستجو برای: radial array
تعداد نتایج: 193863 فیلتر نتایج به سال:
This paper presents a new method of designing a beamformer having a desired broadband beampattern and a focusing capability to operate at any radial distance from the array origin The methodology uses the wave equation based representation of beampatterns to identify an orthogonal basis set of elementary beampatterns by which any arbitrary beampattern can be constructed A set of elementary beam...
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The first phase of the Alborz Observatory Array (Alborz-1) consists of 20 plastic scintillation detectors each one with surface area of 0.25 spread over an area of realized to the study of Extensive Air Showers around the knee at the Sharif University of Technology campus. The first stage of the project including construction and operation of a prototype system has now been completed and the ...
Following fertilization, the Xenopus egg cortex rotates relative to the cytoplasm by 30 degrees about a horizontal axis. The direction of rotation, and as a result the orientation of the embryonic body axes, is normally specified by the position of sperm entry. The mechanism of rotation appears to involve an array of aligned microtubules in the vegetal cortex (Elinson and Rowning, 1988, Devl Bi...
Relaxor-based ferroelectric single crystals Pb(Mg1/3Nb2/3)O3-PbTiO3 (PMN-PT) have drawn much attention in the ferroelectric field because of their excellent piezoelectric properties and high electromechanical coupling coefficients (d33~2000 pC/N, kt~60%) near the morphotropic phase boundary (MPB). Ternary Pb(In1/2Nb1/2)O3-Pb(Mg1/3Nb2/3)O3-PbTiO3 (PIN-PMN-PT) single crystals also possess outstan...
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