Results 231 to 240 of about 63,574 (265)
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Ferroelectrics, 1990
Abstract Attention is drawn to the ferroelectric features of the 123 oxide systems at ambient temperatures. In analogy with Tetragonal Tungsten Bronze (TTB) ferroelectrics, such features are explained on the basis of a phenomenological model of rotational mode and its coupling to one of the low frequency lattice vibrational mode.
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Abstract Attention is drawn to the ferroelectric features of the 123 oxide systems at ambient temperatures. In analogy with Tetragonal Tungsten Bronze (TTB) ferroelectrics, such features are explained on the basis of a phenomenological model of rotational mode and its coupling to one of the low frequency lattice vibrational mode.
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New high rotation mode in magnetized rotating plasmas
Plasma Physics and Controlled Fusion, 2006A new high-rotation (HR) mode of operation is reported for magnetized rotating plasmas. Plasma is produced by an externally applied radial electric field in the Maryland centrifugal experiment, a mirror magnetic field plasma rotating azimuthally. The HR mode is achieved by optimizing over the discharge current.
C Teodorescu +6 more
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Strength of modes in rotating machinery
Journal of Sound and Vibration, 2008A new method for the analysis of modal strength of the rotor systems with periodically time-varying parameters due to the presence of either rotating or stationary asymmetry is proposed. The method is based on the complete development of the modal analysis by introducing the modulated coordinates to derive the equivalent infinite-order time-invariant ...
Lee, CW Lee, Chong-Won +1 more
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Mode generators for high order rotating gyrotron modes
25th International Conference on Infrared and Millimeter Waves (Cat. No.00EX442), 2002In order to cold test the performance of quasi-optical mode converters of gyrotrons, high order gyrotron cavity modes have to be excited at low power levels. There are several approaches to generate such modes. One is to use combined sections of periodically-perturbed-waveguide-wall converters, which step-wise convert from fundamental to high order ...
D. Wagner +5 more
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Topology of the Mode Rotation in Two-mode Optical Fiber
13th International Conference on Fiber Optics and Photonics, 2016We investigate the effect of asymmetric propagation of light wave in two-mode fiber by breaking symmetry of propagation vectors with an off-axis excitation. Spatial mode rotation is observed for an azimuthal variation in launching conditions.
Pradeep C. Tagavula +2 more
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Differential Rotation of R-Modes
AIP Conference Proceedings, 2006Recent work has shown that differential rotation, producing large scale drifts of fluid elements along stellar latitudes, is an unavoidable feature of r‐modes. We discuss the role of this differential rotation in the evolution of the r‐mode instability of newly born, hot, rapidly rotating neutron stars.
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Rotation and improved confinement modes
Plasma Physics and Controlled Fusion, 1994The hypothesis that fluctuation levels and anomalous transport in tokamaks are suppressed by radial shear in E*B rotation is reviewed, with emphasis on the L- to H-mode transition. At present there is no unambiguous experimental support for the hypothesis and further work with better space and time resolution is required.
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Compton spectroscopy for rotation-mode computed tomography
Journal of X-Ray Science and Technology: Clinical Applications of Diagnosis and Therapeutics, 2012In computed tomography (CT) systems, it is desirable to know the X-ray energy spectra for various applications, including medical CT imaging, and diagnostic field and heavy ion therapy. However, because of the restricted space, the only practical solution is to use Compton spectroscopy, where the incident spectrum is inferred from the scattered ...
Mohammadi, A +4 more
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Shocks Associated with Rotational Modes
1991Many interesting systems of conservation laws in several space variables are isotropic in the sense of equivariance under rotations acting on the spatial components of the independent variable and on appropriate components of the state variable (e.g.
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Modes of a rotating dielectric waveguide
Optics and Spectroscopy, 2003Proceeding from the Maxwell differential equations and the Minkowski constitutive equations of the first order with respect to the ratio of the velocity of motion of a medium to the velocity of light in a vacuum, we derived equations for determining the mode structure of a field in a linear isotropic medium with an axially symmetric distribution of the
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