Results 221 to 230 of about 63,875 (265)
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Mode Identification of a Rotating Disk
Experimental Mechanics, 1998A modal testing method permitting identification of the natural frequencies, the number of nodal diameters and wave motions in a rotating disk is presented in this paper. This method is applicable at arbitrary rotation speed without requiring a priori information about the vibration modes of the stationary disk.
T. K. Ahn, C. D. Mote
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Stability of ballooning modes in a rotating plasma
Physical Review A, 1990An equation describing ballooning modes localized to a magnetic field line embedded in rotating plasma is derived and analyzed. On a typical ballooning growth time these modes may be completely stabilized by shear in the flow, in a way which appears to be simple to achieve experimentally. Their long-time behavior is more complicated.
, Hameiri, , Chun
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Psychometrika, 1997
Factor analysis and principal components analysis (PCA) are often followed by an orthomax rotation to rotate a loading matrix to simple structure. The simple structure is usually defined in terms of the simplicity of the columns of the loading matrix. In Three-mode PCA, rotational freedom of the so called core (a three-way array relating components for
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Factor analysis and principal components analysis (PCA) are often followed by an orthomax rotation to rotate a loading matrix to simple structure. The simple structure is usually defined in terms of the simplicity of the columns of the loading matrix. In Three-mode PCA, rotational freedom of the so called core (a three-way array relating components for
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Spontaneous mode rotation in RFX
Plasma Physics and Controlled Fusion, 2005A statistical analysis of spontaneous mode rotations in the reversed field experiment (RFX) reversed field pinch is presented. These rotations involve only m = 1 toroidal magnetic field fluctuations with a velocity that is found to be smaller than that of the fluid motion and in the opposite direction. In RFX magnetic fluctuations are mainly present as
D Terranova, T Bolzonella, S C Guo
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Vibrational modes of a rotating string
Canadian Journal of Physics, 1998Motivated by nonrelativistic models of a QCD (quantum chromodynamic) string, we examine the systemof a nonrelativistic string in uniform rotational motion with one endfixed and with a mass (quark) attached to the other end. A QCD string hasno purely longitudinal modes, so some constraint must be imposed upon thenonrelativistic system to exclude these ...
T.J. Allen, J.R. Schmidt
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Normal modes of synchronous rotation
Icarus, 2005The dynamics of synchronous rotation and physical librations are revisited in order to establish a conceptually simple and general theoretical framework applicable to a variety of problems. Our motivation comes from disagreements between the results of numerical simulations and those of previous theoretical studies, and also because different ...
F VARADI, S MUSOTTO, W MOORE, G SCHUBERT
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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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Molecular rotations and local modes
The Journal of Chemical Physics, 1994Rotational energy level structures of stretching vibrational states have been investigated in the XH2, XH3, and XH4 type symmetrical hydrides. Transformations from standard vibration–rotation normal coordinate Hamiltonians are made to internal coordinate representations which explicitly give the terms responsible for rotational coupling between the ...
Tuomas Lukka, Lauri Halonen
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The Earth's rotational modes revisited
Geophysical & Astrophysical Fluid Dynamics, 2022In the conventional treatment of the Earth’s rotational dynamics using the Earth’s angular momentum description (AMD) it is customary to assume that the velocity/displacement of a mass element in the liquid core (LC) has a rigid rotation and a displacement components in addition to the uniform (solid-body) rotation. This makes for a very complex set of
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