Accurate calculations on the bond length, dipole moment, and harmonic frequency of CO are presented,

A Frequency Scanning Method is introduced in the paper to obtain a more accurate frequency characteristic for identifying harmonic instability in HVdc systems. An example of the application is used to identify the resonance frequencies in the CIGRE benchmark model. The paper shows that the ...

The aim of this paper is to make the calculation of harmonic impedances accurate and efficient. An adaptive scheme is proposed which minimizes the number of frequency samples to be used in the derivation of the impedance/frequency loci. The scheme is then used to derive three-phase harmonic ...

The harmonic voltage distortion caused by static convertors can be greatly affected by the presence of local salient-pole synchronous generators or compensators. Such machines act as harmonic converters and are sensitive to the sequence of the fundamental and harmonic frequencies. This paper provides an ...

The article provides ready-to-use first post-Newtonian-accurate frequency-domain gravitational wave forms for eccentric nonspinning compact binaries of arbitrary mass ratio including the first post-Newtonian point particle corrections to the far-zone gravitational wave amplitude, given in terms of tensor-spherical harmonics. The ...

This study investigated the relationship between harmonic frequency resolution and fundamental frequency (f₀) discrimination. Consistent with earlier studies, f₀ discrimination of a diotic bandpass-filtered harmonic complex deteriorated sharply as the ...

A split-pulse spectrometer based on pairs of time-delayed femtosecond pulses can give access to accurate frequency measurements in the extreme ultraviolet (XUV) spectral domain. We demonstrate this approach by measuring the absolute frequency of a single-XUV-photon transition to a bound state of atomic argon excited with the ninth ...

The XCN and XNC (X = F, Cl) isomers have been investigated using the CCSD(T) method in conjunction with correlation consistent basis sets. Equilibrium geometries, harmonic frequencies, anharmonic constants, fundamental frequencies, and heats of formation ...

We present accurate results based on quantum Monte Carlo simulations of two-component bosonic systems on a square lattice and in the presence of an external harmonic confinement. Starting from hopping parameters and interaction strengths which stabilize the Ising antiferromagnetic phase in the homogeneous case and at half-integer filling factor, we study ...

... Abstract : The patent concerns an optical divider point assembly for harmonic ... with frequency harmonics at the points of virtual image formation to ...

Auditory thresholds with standardized clinical procedures are obtained over a much narrower frequency range by bone conduction than by air conduction. As a result, diagnostic information for both sensorineural and conductive-mechanism function is incomplete for high frequencies. A new magnetostrictive bone-conduction transducer that has the potential for ...

... Sources at Electron Cyclotron Harmonic Frequencies. ... ELECTRONS, GAIN, WALLS, BANDWIDTH, RESISTORS, CYCLOTRONS. ...

... Title : HARMONIC PRODUCTION IN FERROMAGNETIC MATERIALS AT LOW FREQUENCIES AND LOW FLUX DENSITIES. Corporate Author : ...

This paper describes the design and initial testing of a coaxial cavity for microwave surface resistance (Rs) measurement. The cavity design is optimized so as to produce the maximum number of harmonic measurements using TEM modes, in order for accurate measurements of Rs versus frequency to be made. Results for Rs using 17 ...

The efficiency of four different Brillouin-zone integration schemes including the uniform mesh, special point method, special directions method, and Holas method are compared for calculating moments of the harmonic phonon frequencies of the solid one-component plasma. Very accurate values for the moments are also presented. The Holas ...

This paper presents methods for characterizing nonlinearities and sudden disturbances in stationary/transient responses by decomposing signals using the Hilbert-Huang transform (HHT) and a sliding-window fitting (SWF) technique. Similar to the wavelet transform SWF uses windowed regular harmonics and their orthogonality to extract local harmonic ...

... Title : HARMONIC GENERATION AND FREQUENCY MIXING IN LASER- PRODUCED PLASMAS, IN: APPLIED PHYSICS LETTERS, VOL 24, NO 9 ...

A method is introduced for the spectral analysis of complex noisy signals containing several frequency components. It enables components that are independent to be distinguished from the harmonics of nonsinusoidal oscillatory processes of lower frequency. The method is based on mutual information and surrogate testing combined with the ...

A method is introduced for the spectral analysis of complex noisy signals containing several frequency components. It enables components that are independent to be distinguished from the harmonics of nonsinusoidal oscillatory processes of lower frequency. The method is based on mutual information and surrogate testing combined with the ...

... Accession Number : ADP011757. Title : Harmonic Mixing Effects in Schottky Diode Harmonic Mixers at THz Frequencies. ...

Steady-state operation modes of three-phase induction machines can be efficiently simulated by 2D nonlinear time-harmonic finite-element models, although only induced currents with respect to the fundamental air-gap field are correctly taken into account. This technique does not generalise to single-phase induction machines. An approach based on multiple rotor models and a ...

A finite element model was built to simulate the dynamic behavior of soft tissues subjected to sinusoidal excitation during harmonic motion imaging. In this study, soft tissues and tissue-like phantoms were modeled as isotropic, viscoelastic, and nearly incompressible media. A 3D incompressible mixed u-p element of eight nodes, S1P0, was developed to ...

Harmonic complex tones elicit a pitch sensation at their fundamental frequency (F0), even when their spectrum contains no energy at F0, a phenomenon known as �pitch of the missing fundamental.� The strength of this pitch percept depends upon the degree to which individual harmonics are spaced sufficiently apart to be �resolved� ...

Accurate quantum-mechanical calculations of rate constants for a model of reaction in solution are used as benchmarks for two approximate methods: variational transition-state theory with semiclassical corrections for reaction coordinate motion, and the path-integral centroid density method. The reaction model corresponds to a single solute coordinate coupled to a ...

The interaction between partially standing or almost progressive surface gravity waves and erodible beds is investigated in a small wave tank under nonbreaking wave conditions. The bed is initially flat and gently sloping, and the incident weakly nonlinear wave is either a regular wave (similar to a Stokes wave), or a regular wave superimposed on a free wave generated by the wave maker ...

A procedure is proposed to estimate the viscoelastic properties of a complex fluid from the behavior of the velocity autocorrelation function of a suspended Brownian particle, trapped in a harmonic potential. The procedure is tested for a model complex fluid with a given frequency-dependent shear viscosity. The analysis shows that the procedure can provide ...

A procedure is proposed to estimate the viscoelastic properties of a complex fluid from the behavior of the velocity autocorrelation function of a suspended Brownian particle, trapped in a harmonic potential. The procedure is tested for a model complex fluid with a given frequency-dependent shear viscosity. The analysis shows that the procedure can provide ...

The characteristics of continuous-wave wideband traveling-wave tube amplifiers have been experimentally investigated over a frequency range of 1.5 to 4.5 GHz. The authors present measurements of characteristics important for stochastic beam cooling systems that are generally not available from manufacturers' data sheets. The amplifiers measured include models 1177 H01 ...

This paper presents a sliding-window tracking (SWT) method for accurate tracking of the instantaneous frequency and amplitude of arbitrary dynamic response by processing only three (or more) most recent data points. Teager-Kaiser algorithm (TKA) is a well-known four-point method for online tracking of frequency and amplitude. Because ...

... was increased, using cyclotron frequency drive fields ... was less than the upper hybrid frequency. ... radiation at microwave frequencies reported in ...

With the advent of significant improvement in the sensitivity of observation of the betatron spectrum, the appearance of spectral lines at harmonics of the mains power frequency has been observed in the PS and SPS at CERN, the Tevatron at FNAL, and RHIC at BNL. These lines are potentially problematic for accurate tune tracking and the ...

as a spherical convolution of the normal distribution function (NDF) and the BRDF, for a large class of common studied lighting-BRDF convolution. We show how spherical harmonics can be used to filter the NDF it with the BRDF (f) to get an accurate result. A more complex example is Fig. 2, which compares our method

Accurate calculations on the bond length, dipole moment, and harmonic frequency of CO are presented, using large basis sets and high levels of electron correlation. The geometric structure, force constants and binding energies of Cr(C0)6 and Cr(CO)5 are c...

The geomagnetic spatial power spectrum R(sub n)(r) is the mean square magnetic induction represented by degree n spherical harmonic coefficients of the internal scalar potential averaged over the geocentric sphere of radius r. McLeod's Rule for the magnet...

The purpose of this work was to study the second harmonic in the steady state pattern visual evoked potential (ssVEP) to various stimulus frequencies in subjects with normal and defective binocularity. ssVEPs were elicited by 4 c/deg sinusoidal gratings, with temporal frequencies ranging from 5 to 20 Hz (exp. 1) and 15 to 27.5 Hz (exp. ...

A new method for estimating the fundamental frequencies of concurrent musical sounds is described. The method is based on an iterative approach, where the fundamental frequency of the most prominent sound is estimated, the sound is subtracted from the mixture, and the process is repeated for the residual signal. For the estimation stage, an algorithm is ...

Bats typically emit multi harmonic calls. Their head morphology shapes the emission and hearing sound fields as a function of frequency. Therefore, the sound fields are markedly different for the various harmonics. As the sound field provides bats with all necessary cues to locate objects in space, different ...

Bats typically emit multi harmonic calls. Their head morphology shapes the emission and hearing sound fields as a function of frequency. Therefore, the sound fields are markedly different for the various harmonics. As the sound field provides bats with all necessary cues to locate objects in space, different ...

An improved dual aperture dipole electromagnet includes a second-harmonic frequency magnetic guide field winding which surrounds first harmonic frequency magnetic guide field windings associated with each aperture. The second harmonic winding and the firs...

Advances in Laser Technology and nonlinear Optical techniques can be effectively utilized for LIDAR applications in space and atmospheric sciences to achieve better flexibility and control of the available optical power. Using such devices, one can achieve highly accurate and resolved, measurement of the distribution for atmospheric scattering layers. In the present ...

... confirmed to appear primarily at frequency-multiples of ... and dynamic friction demonstrated that energy dissipation in harmonic drives varies non- ...

... MATLAB programs for computation of harmonic power levels and plots of harmonic power levels of multibit DRFM are included in the thesis. ...

... Likewise, recent research on quantum well negative ... can be achieved by generating harmonics of ... output at the higher harmonic frequencies. ...

... Accession Number : ADD301756. Title : LASER PROBING OF SECOND HARMONIC GENERATION AT LOW FREQUENCIES. Corporate Author : ...

Two estimation methods for a backward impedance of a power distribution system are proposed in this paper. A frequency response of a transient current flowing into a capacitor, which connected to a distribution line, has information of the backward impedance. The impedance is obtained from an attenuation constant and a resonance frequency determined by the ...

The longitudinal coherence of free-electron laser (FEL) radiation can be enhanced by seeding the FEL with high harmonics of an optical laser pulse. The radiation produced by high-harmonic generation (HHG), however, has a fast-varying temporal profile that can violate the slowly varying envelope approximation and limited frequency ...

The duration of the mode-locked CO2 laser pulses was measured to be 0.9 + or - nsec by the technique of second harmonic autocorrelation. Knowing the pulse duration, the spot size, and the harmonic conversion efficiency, a detailed fit of experiment to theory gave an estimate of the nonlinear coefficient of AgGaSe2, d36 = 31 + or - V(1), in agreement with ...

In this paper we develop an analytic expression for the critical temperature for a gas of ideal bosons in a combined harmonic lattice potential, relevant to current experiments using optical lattices. We give corrections to the critical temperature arising from effective mass modifications of the low energy spectrum, finite size effects, and excited band states. We compute the ...

... Accession Number : ADD200835. Title : An Accurate Prediction of Natural Frequencies of Laminated Plates by a Higher Order Theory. ...

Operation of a free-electron laser at harmonics of the fundamental frequency is explored with the numerical simulation code HELEX. This code includes coupling to the harmonics caused by misalignment of the electrons with the optical beam and coupling due ...

The development of a comprehensive approach to the modeling of electric power transmission systems at harmonic frequencies is presented. For harmonic analysis it is not practically possible to model a large transmission system with its neighboring interconnected systems in detail due to computer time and memory limitations. A large ...

The application of pulse modulation control (choppers) to dc motors creates unique instrumentation problems. In particular, the high harmonic components contained in the current waveforms require frequency response accommodations not normally considered in dc instrumentation. In addition to current sensing, accurate power measurement ...

...the fifth harmonic of the highest fundamental frequency or to 100 GHz, whichever...the fifth harmonic of the highest fundamental frequency or to 200 GHz, whichever...the oscillator frequency. Radiation at the frequencies of...

A packet radio has carrier frequencies which are harmonics of a reference frequency. A step recovery diode produces (in effect) all the harmonics. A digital to analog converter causes a voltage controlled oscillator to produce a frequency which is one of ...

A comparison of the analysis of similarly developed microactuators is presented. Accurate modeling and simulation techniques are vital for piezoelectrically actuated microactuators. Coupling analytical and numerical modeling techniques with variational design parameters, accurate performance predictions can be realized. Axi-symmetric two-dimensional and ...

A time ephemeris of the Earth is related with a relativistic time-dilation and is represented by the solar system barycentric time (TCB) and the geocentric coordinate time (TCG). At present a time ephemeris of the Earth is obtained by numerical integration (Fukushima 1995 A&A; Irwin & Fukushima 1999 A&A), but it is inconvenient for practical use. In this paper, we decomposed the ...

Large-area high-spatial-frequency patterns (HSFLs) of ?/6 periodicity have been generated by a nanojoule-femtosecond laser scanning technique (80 MHz, 170 fs, 700-950 nm) at the silicon-air interface. The excellent large-area uniformity allowed reproducible and accurate measurements of the periodicity. Variation of experimental parameters as illumination ...

... cyclotron frequency. Harmonic cyclotron wave amplifiers have the possibility of giving rise to a new class of devices at millimeter wave frequencies. ...

... Low-and High-Order Harmonic ... semiconductor heterostructures at Terahertz frequencies. ... FAR INFRARED RADIATION, FREQUENCY, OPTICAL ...

We report on the measurement of oscillation frequency and spectral linewidth of sub-terahertz GaInAs/AlAs resonant tunneling diode (RTD) oscillators by harmonic heterodyne detection using a Ni-InP Schottky barrier diode integrated with a bow-tie antenna. For an RTD oscillating at 550 GHz and having an output power ?1 ?W, the measured spectral linewidth was ...

We investigate torsional Alfven oscillations of relativistic stars with a global dipole magnetic field, via 2D numerical simulations. We find that a) there exist two families of quasi-periodic oscillations (QPOs) with harmonics at integer multiples of the fundamental frequency, b) the QPOs are long-lived, c) for the chosen form of dipolar magnetic field, ...

The spectral properties of radiation of a relativistic electron beam in a two frequency harmonic undulator are analytically investigated. The technique of generalized Bessel function is effectively used to present some of the novel features associated with the two frequency harmonic undulator radiation. An ...

The electromagnetic field strength present within the focal volume of a pulsed laser is routinely high enough to produce reasonably efficient nonlinear summing and mixing of optical frequencies. The polarization-dependence of the outgoing beam is a sensitive function of the polarization state(s) of the incident beam(s) and the structure, orientation, and symmetry of the ...

A precise vector voltmeter (Princeton Applied Research Model 129, operated in the two-phase lock-in amplifier mode) is used in a microwave power calibrating system to accurately measure the outputs of a network analyzer (Hewlett Packard Model 8410 with Model 8411A harmonic frequency converter and Model 8413A phase-gain indicator). The ...

Generalized harmonic analysis was applied to a high-temperature superconducting quantum interference device (SQUID) magnetocardiograph signal processing system. The noise frequencies in the signal waveform were calculated by the generalized harmonic analysis (GHA) and the noise components with these frequencies ...

A sound-coding strategy for users of cochlear implants, named enhanced-envelope-encoded tone (eTone), was developed to improve coding of fundamental frequency (F0) in the temporal envelopes of the electrical stimulus signals. It is based on the advanced combinational encoder (ACE) strategy and includes additional processing that explicitly applies F0 modulation to channel ...

For (H2O)n where n=1-10, we used a scheme combining the molecular dynamics sampling with high level ab initio calculations to locate the global and many low lying local minima for each cluster. For each conformer, we extrapolated the RI-MP2 energies to their complete basis set limit, included a CCSD(T) correction using a smaller basis set and added finite temperature corrections within the ...

Algorithms based on the discrete Fourier transform and the least-squares three-parameter sine fit have been used for accurate low-frequency voltage measurement using integrating digital voltmeters. Bayesian statistics is here applied to the common problem of fitting a truncated Fourier series with constant and known fundamental ...

Pitch differences between concurrent sounds are important cues used in auditory scene analysis and also play a major role in music perception. To investigate the neural codes underlying these perceptual abilities, we recorded from single fibers in the cat auditory nerve in response to two concurrent harmonic complex tones with missing fundamentals and equal-amplitude ...

The series-resonant converter is one of the major classes of electronic power converters that are extensively applied in dc-dc conversion. This technology transfers bulk energy efficiently through a series-resonant circuit in the direct path of the energy transfer. This resonant converter forms a high-frequency ac link between the voltage sources connected to the input and ...

Absolute frequency measurement of the 70.5 ?m wavelength (4.25 THz) line of a methyl alcohol (CH3OH) optically-pumped laser has been made by 47th-harmonic mixing with a Gunn diode (90 GHz) using a Nb-Nb point-contract Josephson junction (JJ). The frequencies of the pump CO2 and the optically-pumped CH3OH lasers are locked, ...

Intermodulation and harmonics are important in frequency analysis of nonlinear systems. In neuron research, most investigations are taken in studying synchronization between the external stimuli and the output of neuron, but harmonics and intermodulation are often ignored. In this paper, harmonics and ...

Intermodulation and harmonics are important in frequency analysis of nonlinear systems. In neuron research, most investigations are taken in studying synchronization between the external stimuli and the output of neuron, but harmonics and intermodulation are often ignored. In this paper, harmonics and ...

... of harmonic coefficients of order 15 and 30 can be determined most accurately by analysis of satellite orbits which experience 15th-order resonance ...

Power quality in AC power system depends on the harmonic content of the waveform . To accurately predict the content of harmonic components in a particular ...

... treatment of multiple cyclotron harmonics and ... between multiple Radio frequency cavity modes, is ... to treat several cavity frequencies simultaneously. ...

... to support the hypothesis that for large roughnesses, the instantaneous sound amplitudes are harmonic functions of sound frequency; that is, there ...

... Descriptors : *CHEMICAL LASERS, *HARMONIC GENERATORS ... IODATES, IODINE, LASERS, FREQUENCY ... OUTPUT, OXYGEN, PHOTOLYSIS ...

... subjected to a transverse high-frequency electric field ... to produce power output at harmonic frequencies of the ... a slow and a fast cyclotron wave, and ...

... electronic equipment, highly stable harmonic and subharmonic frequencies derived from a secondary-standard crystal oscillator are frequently ...

... CONVERTERS, HARMONIC GENERATORS, SILICON CONTROLLED RECTIFIERS, CURRENT LIMITERS, SUPERLOW FREQUENCY ...

... VOLTAGE REGULATORS, HARMONIC GENERATORS, SILICON CONTROLLED RECTIFIERS, CURRENT LIMITERS, SUPERLOW FREQUENCY ...

Presented here is a new time�frequency signal processing methodology based on Hilbert�Huang transform (HHT) and a new conjugate-pair decomposition (CPD) method for characterization of nonlinear normal modes and parametric identification of nonlinear multiple-degree-of-freedom dynamical systems. Different from short-time Fourier transform and wavelet transform, HHT uses the ...

The design and performance of an experimental in-line microwave frequency harmonic generator are described and the efficiency of the Gallium Arsenide varactor diode used in this device for the generation of harmonic microwave power at 26.4 Gc/s from a fun...

The link detector combines a model-based spectral peak tracker with an echo filter to detect echolocation calls of bats. By processing calls in the spectrogram domain, the links detector separates calls that overlap in time, including call harmonics and echoes. The links detector was validated by using an artificial recording environment, including synthetic calls, atmospheric ...

Changes in global sea level are important forcing functions upon the quality and quantity of sedimentation within basins. Additional overprints are caused by local to global tectonism. An understanding of the intimate relationships between changes in global sea level and concomitant global tectonism is crucial to the accurate modeling and prediction of secular trends in basin ...

... for most screening populations, the frequency of ... DATA, DETECTION, PREDICTIONS, HARMONICS, POPULATION, NONLINEAR ...

... FREQUENCY RESPONSE, ACOUSTIC IMPEDANCE, PIEZOELECTRIC TRANSDUCERS, HARMONIC ANALYSIS, MECHANICAL IMPEDANCE. ...

... the human auditory system, watermarking ... Descriptors : *AQUATIC ANIMALS, *UNDERWATER COMMUNICATIONS, HARMONICS ...

... harmonic, and the greater the ratio of the "inter- modulation' feedback to ... if the "direct" feedback is decreased while the "intermodulation" feedback is ...

These cryocoolers produce significant vibration at the harmonics of the drive frequency due to motor design and gas thermodynamics. A simple control system ...

We study ultrahigh frequency surface acoustic wave propagation in nickel-on-sapphire nanostructures. We make use of high-order harmonic generation to obtain ultrafast, coherent, beams in the extreme ultraviolet (EUV) region of the spectrum. The short wavelengths �30 nm allow us to measure propagation dynamics of surface acoustic waves to ...

The demand for high-frequency low-loss filters generates intensive research on innovative wave guide solutions. In this work, a GHz SAW device based on a ZnO/Si structure was fabricated using classical UV photolithography. The thickness of the piezoelectric thin film was optimized and a specific interdigital transducer structure was used to generate third and fifth ...

Changes in global sea level are important forcing functions upon the quality and quantity of sedimentation within basins. Additional overprints are caused by local to global tectonism. An understanding of the intimate relationships between changes in global sea level and concomitant global tectonism is crucial to the accurate modeling and prediction of secular trends in basin ...

High resolution frequency measurements of the 110 GHz gyrotron at TEXTOR and the 105 GHz mode of the two-frequency gyrotron (Odissey-1) at ASDEX Upgrade (AUG) have been made in support of fast ion collective Thomson scattering diagnostics. Measurements were done by harmonic heterodyne methods using both fast Fourier transform ...

In the marine controlled-source electromagnetic method, the Earth response varies in frequency; therefore, using a wide range of frequencies may better constrain geological structure than using a single frequency or only a few closely spaced frequencies. Binary waveforms, such as the square wave, provide a number ...

A method is developed to compute low-level response amplitude exceedance probabilities associated with uncertain nonlinear structures with random parameters and deterministic periodic forcing. Emphasis is focused on accurate and efficient computation in the tails of the exceedance probability distribution function associated with the largest possible response of one ...

Low-frequency oscillations of the earth's magnetic field recorded by the University of California at Los Angeles magnetometer on board ATS 1 have been examined for the 6-month interval January-June 1968. Using evidence from Ogo 5 and ATS 5 as well as the data from ATS 1, we argue that the dominant mode at ATS 1 must be the fundamental rather than the second ...

Harmonic and intermodulation distortion are two crucial performance parameters of laser diodes in determining their utility in wide bandwidth analog links. In this paper, for the first time, the multimode rate equations are solved numerically to give information on the bandwidth, phase, harmonic, and intermodulation distortion of GaInAsP laser diodes at ...

An experimental method to measure frequency-averaged Rosseland and Planck mean opacities is presented. We propose using high-order harmonics (HHG) from a laser-plasma source to probe plasma opacities at multiple photon energies enabling the determination of accurate values of the frequency-averaged opacities. The ...

A signal processing method for the separation of concurrent harmonic sounds is described. The method is based on a twostage approach. First, a multipitch estimator is applied to find initial sound parameters which are reliable, but inaccurate and static. In a second stage, more accurate and time-varying sinusoidal parameters are estimated in an iterative ...

Use is made of the harmonic-potential constants and parameters in linearized and curvilinear internal coordinates in an analysis of the data on electron scattering intensities, vibration frequencies, Coriolis constants, and rotational centrifugal constants for SeO/sub 2/ and ClO/sub 2/, including data for isotopic molecules. In addition, the spectral ...

At high intensities, three-step recollision processes driven by low frequency laser pulses, such as high-order harmonic generation and high-order above-threshold ionization, are normally severely suppressed by the magnetic-field component of the laser field. It is shown that this suppression is not severe, even for ponderomotive energies well above 10 keV, ...

Conventional methods to calculate the thermodynamics of crystals evaluate the harmonic phonon spectra and therefore do not work in frequent and important situations where the crystal structure is unstable in the harmonic approximation, such as the body-centered cubic (bcc) crystal structure when it appears as a high-temperature phase of many metals. A ...

Spatial characterization of high harmonics (HH) and XUV coherent radiation is of paramount importance, along with its temporal characterization. For many applications it will be necessary to accurately measure the beam properties, just as it is important to know the beam characteristics for many laser experiments. For example, high ...

Techniques for analyzing and evaluating the harmonic levels in an industrial facility's electrical distribution system are presented. The various system models and types of harmonic source representation are described. A harmonic evaluation should be performed when a new industrial facility will include sources of ...

This study tested the relationship between frequency selectivity and the minimum spacing between harmonics necessary for accurate fo discrimination. Fundamental frequency difference limens (fo DLs) were measured for ten listeners with moderate sensorineural hearing loss (SNHL) and three normal-hearing listeners for ...

We ascribe the twin kilohertz Quasi Periodic Oscillations (kHz QPOs) of X-ray spectra of Low Mass X-Ray Binaries (LMXBs) to the pseudo-Newtonian Keplerian frequency and the apogee and perigee precession frequency of the same matter in the inner disk, and ascribe 15-60 ,Hz QPO (HBO) to the apogee (or perigee) precession and its second ...

White Dwarfs are stars near the end of their lives which may pulsate with periods of a few minutes, and which can be observed to brighten and dim as they pulsate. Observations of white dwarf light curves are characterised by broken time series (where days intervene between nighttime observations). Moreover the pulsation frequencies show appreciable amplitude ...

Time period = 1/frequency Figure 1. A simple waveform. This kind of graph shows sound in the time, and so on. This is an example of a special class of sound in which the frequencies of the partials the fundamental are also called harmonics of the fundamental frequency, and the class of sound is called ...

...635 Unwanted radiation. ...decibels) on any frequency removed from...P) of the highest emission...harmonic of the highest fundamental frequency designed to...harmonic of the highest fundamental frequency designed...

An improved dual aperture dipole electromagnet includes a second-harmonic frequency magnetic guide field winding which surrounds first harmonic frequency magnetic guide field windings associated with each aperture. The second harmonic winding and the first harmonic windings ...

An improved dual aperture dipole electromagnet includes a second-harmonic frequency magnetic guide field winding which surrounds first harmonic frequency magnetic guide field windings associated with each aperture. The second harmonic winding and the first harmonic windings ...

We describe here a system for accurate measurement of the dielectric properties of very low-loss materials in the 130 to 170 GHz frequency range. This system utilizes an open resonator with a quality factor � 1 � 106. Resonance curves for this resonator are acquired with a commercial spectrum analyzer equipped with an external millimeter-wave ...

Calculating accurate forces within variational and diffusion Monte Carlo (VMC and DMC) methods is a very challenging problem. We derive expressions for the contribution to the Hellmann-Feynman force from nonlocal pseudopotentials for use within the VMC and DMC methods. Equilibrium bond lengths and harmonic vibrational frequencies are ...

A frequency synthesizer is provided that is capable of supplying a plurality of accurate frequencies. The frequency synthesizer comprises a resonator matrix including a plurality of resonators embedded in a single monolithic piece of piezoelectric crystal...

It was recently shown that granular packings composed of frictionless particles with purely repulsive contact interactions are strongly anharmonic. When perturbed along an eigenmode of the static packing (in the harmonic approximation), energy leaks from the original mode of vibration to a continuum of frequencies even when the system is under significant ...

The characteristics of continuous-wave wideband traveling-wave tube amplifiers have been experimentally investigated over a frequency range of 1.5 to 4.5 GHz. We present measurements of characteristics important for stochastic beam cooling systems that are generally not available from manufacturers' data sheets. The amplifers measured include models 1177 H01 and 1277 ...

Forced oscillations in sessile droplets can be exploited in electrowetting mixing of fluid fractions. The necessary complex flows and large shape deformations require a numerical investigation of fluid dynamics in the transient regime. We provide a means to characterize oscillations qualitatively and quantitatively with the goal to examine and to classify flow patterns occurring inside. A ...

The laser-based nonlinear optical methods of second-harmonic generation and sum-frequency generation have been developed to study the chemical composition and concentration of natural surfactant materials present as slicks on the ocean surface. These noninvasive second-harmonic and sum-frequency generation methods ...

Lithium niobate has recently been used for SAW tags and temperature sensors because of its high coupling coefficient and high reflectivity. To increase the device operating frequency for a given electrode line resolution, harmonic operation of the reflector is a very attractive option. When used in conjunction with harmonically ...

We calculate the harmonic spectrum generated by a model HD molecule in a strong laser pulse. The unequal nuclear masses lead to the emission of even harmonics, i.e., photon frequencies which are even multiples of the laser frequency. The effect does not occur within the Born-Oppenheimer approximation. In the ...

The accurate knowledge of high-speed motorised spindle dynamic behaviour during machining is important in order to ensure the reliability of machine tools in service and the quality of machined parts. More specifically, the prediction of stable cutting regions, which is a critical requirement for high-speed milling operations, requires the accurate ...

A generalized weak turbulence theory for electromagnetic emission at multiple harmonics of the plasma frequency is developed. In the literature, the electromagnetic emission at the plasma frequency and/or its second harmonic has been intensively studied. However, the emission at harmonics ...

... 4 not any other arbitrary frequency. ... for Harmonic Template Generation ... The output waveform from each filter is passed through a hair cell model (r(t;x ...

... Accession Number : ADD001415. Title : Prism to Separate a Second Harmonic from its Fundamental Frequency. Descriptive Note : Patent,. ...

... Nd:Glass Laser Radiation Using Large ... BANDWIDTH, AMPLITUDE, FREQUENCY CONVERSION ... HARMONICS, COMPUTATIONS, HIGH POWER ...

... However, in the harmonic frequency range of 180 Hz to 3 kHz, these parasitics play a potentially substantial role in power losses in the filter. ...

... Title : Dispersion of Electrostatic Ion Plasma Waves near Harmonics of the Ion Cyclotron Frequency. Descriptive Note : Techncial rept.,. ...

The polarization state of the input pulses to a segment of microstructured fiber controls the harmonic generation yielding specific frequencies depending on of the input state.

. As discussed earlier, factorization of the harmonic balance Jacobian by direct methods is prohib� itively

Localized narrowband low-frequency shear waves can be non-invasively generated within tissue, by a modulated finite-amplitude radiation force, resulting from the interference of two focused quasi-CW ultrasound beams of slightly different frequencies. Assuming a Voigt viscoelastic model, this paper describes the use of a finite-element-method model, to ...

Accurate measurement of internal magnetic field direction using motional Stark effect (MSE) polarimetry in the edge pedestal is desired for nearly all tokamak scenario work. A newly installed 500 kHz 32-channel digitizer on the MSE diagnostic of DIII-D allows full spectral information of the polarimeter signal to be recovered for the first time. Fourier analysis of this data ...

Accurate measurement of internal magnetic field direction using motional Stark effect (MSE) polarimetry in the edge pedestal is desired for nearly all tokamak scenario work. A newly installed 500 kHz 32-channel digitizer on the MSE diagnostic of DIII-D allows full spectral information of the polarimeter signal to be recovered for the first time. Fourier analysis of this data ...

In a high-gain free-electron laser, strong bunching at the fundamental wavelength can drive substantial harmonic bunching and sizable power levels at the harmonic frequencies. In this paper, we investigate the three-dimensional evolution of the harmonic fields based on the coupled Maxwell-Vlasov equations that take ...

Demonstration Number 1 in the IPO-NIU-ASA collection of auditory demonstrations (compact disk) periodically cancels and reinserts a harmonic of a complex tone having a 200-Hz fundamental and 20 equal-amplitude harmonics. This procedure causes a listener to hear out the manipulated harmonic as a separate tone. In this way, the ...

Fluctuation analysis of the motional Stark effect (MSE) diagnostic allows for the direct internal measurement of Bz. Coherent fluctuations from internal tearing modes are easily observed on several MSE channels. At the heart of this measurement is the accurate recovery of MHD sidebands at 2nd harmonic photoelastic modulator (PEM) ...

We present detailed observations of a region near the terrestrial plasmapause where narrowband electromagnetic radiation (previously called escaping nonthermal continuum radiation) is being generated. These observations show a direct correspondence between the narrowband radio emissions and electron cyclotron harmonic waves near the upper hybrid resonance ...

...by a digital device, the frequency range shall be investigated up to the higher of the second harmonic of the highest local oscillator frequency generated in the device or...the oscillator frequency. Radiation at the frequencies of...

Dominant frequency analysis (DFA) and organization analysis (OA) of cardiac electrograms (EGMs) aims to establish clinical targets for cardiac arrhythmia ablation. However, these previous spectral descriptions of the EGM have often discarded relevant information in the spectrum, such as the harmonic structure or the spectral envelope. We propose a fully ...

The harmonics of the return current may interfere with the signaling current along with the rails. In this paper, we present the theoretical studies of the return current harmonics in the inverter-controlled DC electric railcar, aiming at contributing future work to improve the compatibility with the signaling current. We theoretically derive sideband ...

It is shown that squeezing will inevitably be generated in a harmonic oscillator with time-dependent frequency for any nonvanishing rate of frequency change, sudden or smooth. The general form of the time-dependent transition probabilities among the eigenstates of the initial Hamiltonian is obtained with an exact operator approach. ...

The rapid advances in the generation of ultra-short optical pulses in recent decades have often outstripped the ability of metrologists to accurately measure the pulses' temporal profiles. With each reduction in pulse duration, existing measurement techniques must be re-evaluated and often times partially or completely replaced with newer schemes providing the required ...

After defining the relation between harmonic voltages and currents through harmonic impedances, the impact of harmonics on electromagnetic end-use devices such as transformers and machines is formulated based on analytical and experimental investigations. A harmonic factor representing the square of a weighted ...

... The frequency of vibration was measured with a Frahm vibrating- reed tachometer, accurate to 0.5 percent of the frequency reading and with a ...

During the past decade, the plasma frequency probe (PFP) has evolved into an accurate, proven method

... The laser radar was able to accurately measure a target's vibrational frequency and amplitude for amplitudes greater than 40 nim The theoretical ...

This paper presents a dynamics-based methodology for accurate damage inspection of thin-walled structures by combining a boundary-effect evaluation method (BEEM) for space-wavenumber analysis of measured operational deflection shapes (ODSs) and a conjugate-pair decomposition (CPD) method for time-frequency analysis of time traces of measured points. BEEM ...

Membrane dynamics is often nonlinear and nonstationary because of geometric nonlinearity induced by high local flexibility, non-uniform pre-tension, light weight, dynamic coupling with surrounding air, wave propagation, supportinduced nonlinearity, and others. Hence, dynamics characterization and health monitoring of membrane structures require advanced time-frequency ...

Applications in the millimeter and submillimeter -wave regime cover a broad domain of scientific disciplines including atmospheric radiometry, plasma physics, automobile collision avoidance, smart munitions, and the analysis of emission spectra of celestial bodies. A persistent issue in the development of millimeter and submillimeter -wave systems has been the lack of inexpensive, reliable, low ...

This paper proposes a new model for three-phase transformers with three legs with and without tank under DC bias based on electric and magnetic circuit theory. For the calculation of the nonsinusoidal no-load currents, a combination of time and frequency domains is used. The analysis shows that (1) asymmetric three-phase transformers with three legs generate magnetizing ...

The objective of this work was to image the presence of impact damage by monitoring the nonlinear response of damaged carbon/epoxy composite samples. The presence of microcracks, debonding, delamination, etc� induce the material to behave in a nonlinear elastic fashion highlighted by the presence and amplitude of harmonics in the spectrum of the received signal when the ...

Cyclotron wave amplifiers at the harmonics of the electron cyclotron frequency are investigated. Since the waves on the beam are electrostatic, harmonics are strongly excited in nonrelativistic beams if they are rotating rather than filamentary. These mod...

This simulation illustrates the behavior of standing waves in situation where one end fixed, both ends are fixed, and both ends are free. The simulation allows the user to examine the standing wave behavior at the fundamental frequency and when the first three harmonics are added. The user can control the amplitude of each of the ...

Studies were made of the harmonic content of the current and voltage at the generator bus of the Tokamak Fusion Test Reactor. Out of numerous load scenarios, one case was considered in detail. The harmonics were found acceptable for the generator; however...

A method of accelerating protons in a synchrotron by changing from one harmonic to another in order to keep the beam near the center of the aperture without frequency-modulating the cavities is considered. Harmonic hopping is done by adiabatically debunch...

A waveguide harmonic damper was designed for removing the harmonic frequency power from the klystron amplifiers of the APS linac. Straight coaxial probe antennas are used in a rectangular waveguide to form a damper. A linear array of the probe antennas is used on a narrow wall of the rectangular waveguide for damping klystron ...

Higher harmonic imaging technique is applied for delineate the weld interface of thin metal plates and detecting tight cracks in glass plates. The technique of mode-converted shear wave is used for extracting higher harmonics and imaging the harmonic amplitudes. The backscattered higher harmonic wave is captured by ...