Results 131 to 140 of about 26,388 (164)
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2001
The oscillation of gas bubbles is known to be highly nonlinear for moderate driving pressure amplitudes [87]. “Moderate amplitude” means amplitude between 100 and 500 kPa, amplitudes that occur frequently in diagnostic ultrasound imaging. The nonlinear oscillations cause the bubbles to radiate sound at harmonics of the driving acoustic pressure pulse.
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The oscillation of gas bubbles is known to be highly nonlinear for moderate driving pressure amplitudes [87]. “Moderate amplitude” means amplitude between 100 and 500 kPa, amplitudes that occur frequently in diagnostic ultrasound imaging. The nonlinear oscillations cause the bubbles to radiate sound at harmonics of the driving acoustic pressure pulse.
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Decomposing magnetic fields into their higher harmonics
Proceedings of the American Institute of Electrical Engineers, 1915When it is necessary to decompose a magnetic field into its higher harmonics the same methods used for analyzing current and voltage waves may be employed. In many cases, however, the usual long mathematical operations can be avoided by representing the field shapes as geometrical figures, such as triangles, rectangles, trapezoids, etc., all of which ...
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Aircraft Engineering and Aerospace Technology, 1958
The elimination of the retreating blade stall speed limitation for helicopters by means of an appropriately programmed feathering input is studied for the general case of a rigid flapping blade with hinge constraint (thus making the results applicable to conventional, offset‐hinged or cantilevered rotor blades).
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The elimination of the retreating blade stall speed limitation for helicopters by means of an appropriately programmed feathering input is studied for the general case of a rigid flapping blade with hinge constraint (thus making the results applicable to conventional, offset‐hinged or cantilevered rotor blades).
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On the higher orders of hyperspherical harmonics
Journal of Mathematical Physics, 1983We suggest a procedure to evaluate matrix elements between hyperspherical harmonics of any order. The method is based on the hyperspherical expansion of a Slater determinant constructed with oscillator wavefunctions. Explicit formulas are given for all matrix elements up to order Lm+2.
E. Arribas +2 more
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Moiré and higher grating harmonics
Journal of the Optical Society of America, 1975The conditions for and formation of low-spatial-frequency beat patterns between superposed grid structures are studied. The application of moire techniques for Fourier analysis of incoherently illuminated distributions is demonstrated. The different multiples of the fundamental spatial frequency of a grating are used to form distinguishable moire ...
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Nonlinear Impedances (Higher Harmonics)
2013When linear electrical elements are used in circuits, the measured impedances are independent of the amplitude of the ac perturbation. However, in electrochemistry, the electrical equivalent parameters related to the kinetics, diffusion, and other aspects are nonlinear because the current is a nonlinear function of the applied potential. In such cases,
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Modelling and prediction of current harmonics generated by power converters in distribution networks
IET Generation, Transmission and Distribution, 2021Firuz Zare +2 more
exaly
On Norms of Higher Gradients of Harmonic Functions
Journal of the London Mathematical Society, 1971openaire +2 more sources