Results 261 to 270 of about 204,577 (297)
Some of the next articles are maybe not open access.
On the evaluation of higher harmonics in nearly sinusoidal oscillators
International Journal of Circuit Theory and Applications, 1993AbstractAn approximation method for calculating the periodic oscillations of nearly sinusoidal oscillators is presented which is based upon the classical pertubation method. Both the frequency and the amplitude of the harmonics of the oscillation are calculated to a first approximation by very simple relations which are useful for deriving a design ...
BUONOMO, Antonio, DI BELLO C, GRECO O.
openaire +2 more sources
Higher‐harmonic atomic force microscopy
Surface and Interface Analysis, 2006Abstract To maximize the spatial resolution of atomic force microscopy (AFM), it is helpful to isolate the spurious short‐range components from the plethora of force contributions acting between AFM tips and samples.
openaire +1 more source
Higher Harmonic Generation Microscopy
2005Higher harmonic-generation, including second harmonic generation and third harmonic generation, leaves no energy deposition to the interacted matters due to its virtual-level transition characteristic, providing a truly non-invasive modality and is ideal for in vivo imaging of live specimens without any preparation.
openaire +2 more sources
Higher harmonics in the Josephson effect
Physics Letters A, 1980Abstract In the low temperature regime where macroscopic flux tunneling allows a SQUID magnetometer to follow the stable thermodynamic free energy without hysteretic dissipation, it is possible to exhibit macroscopic quantum behaviour via higher Josephson harmonic oscillations in the thermal response.
A. Widom, T.D. Clark, G. Megaloudis
openaire +1 more source
SYNCHRONIZATION OF HIGHER HARMONICS IN COUPLED ORGAN PIPES
International Journal of Bifurcation and Chaos, 2007We report results on the synchronization of two organ pipes positioned side by side. Special attention is put on the synchronization of the higher harmonics. As possible explanation, classical theory provides the amplitude death as explanation for the reduction to almost silence of two coupled organ pipes.
M. Abel, S. Bergweiler
openaire +2 more sources
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 ...
openaire +1 more source
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.
openaire +1 more source
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.
openaire +1 more source
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
openaire +2 more sources
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).
openaire +1 more source
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).
openaire +1 more source
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 ...
openaire +1 more source