Calculations are presented for the forced shear layer studied experimentally by Oster and Wygnanski,

... This work is an updating of earlier calculations that were less accurate, especially in the frequency range above 10 GHz. ...

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

... More recently, Tol- stoy and Clay [2] have discussed more accurate models for a shallow water channel which include the effects of attenuation in ...

In this project attention has been focused on: (1) The accurate calculation of the dispersive properties of laminated and two- and three-dimensional fiber-reinforced elastic composites; (2) The accurate determination of natural frequencies of composite pl...

Certain transition frequencies in the vibrational-rotational spectra of HD/sup +/, HT/sup +/, and DT/sup +/ have been calculated to a high degree of accuracy. For HD/sup +/ the differences between the calculated frequencies and the recently reported observed frequencies are less than those ...

This paper reports a calculation of the cross section and momentum transfer frequency for collision of oxygen ions and oxygen atoms. The calculation includes effects due to resonance charge exchange, polarization, and charge-quadrupole interactions. Results are compared with earlier calculations. This collision is ...

Semiclassical variational methods are used to obtain estimates of the quantum mechanical energy levels for two simplified models of the potential seen by a helium atom trapped inside a C-70 cage. We find that with the use of a simple trial solution, the calculations are simple. A more complicated trial trajectory, while improving some results of the ...

A digital signal processor is implemented to control resonant frequency of the RFQ prototype in APT/LEDA. Two schemes are implemented to calculate the resonant frequency of RFQ. One uses the measurement of the forward and reflected fields. The other uses the measurement of the forward and transmitted fields. The former is sensitive and ...

A finite element field solver for dipole modes in axisymmetric structures has been written. The second-order elements used in this formulation yield accurate mode frequencies with no spurious modes. Quasi-periodic boundaries are included to allow travelling waves in periodic structures. The solver is useful in applications requiring precise ...

We write the Green function of the d-dimensional hypercubic lattice in a piecewise form covering the entire real frequency axis. Each piece is a single integral involving modified Bessel functions of the first and second kinds. The smoothness of the integrand allows both real and imaginary parts of the Green function to be computed quickly and accurately ...

A review of results obtained in the framework of the semiclassical approach in nanophysics is presented. A semiclassical description based on electrostatics and the Thomas-Fermi model is used to calculate the dimensions of the electronic shell of a fullerene molecule and a carbon nanotube. This simplified approach yields surprisingly accurate results in ...

State-of-the-art, calibrated ab initio quantum chemical calculations have been performed to obtain accurate structures, energies, and vibrational frequencies of the lowest singlet states of HNS and NSH, which are closed-shell states. Enthalpies of formati...

Feb 15, 2008 ... the interferometer interference fringe cycle ambiguity, which can be resolved ... Phase measurements at widely separated frequencies are used to calculate ... observations on the target and calibrator with a short scan time on ...

Non-uniform shafts can be used as accurate models for the analysis of missile vibrations. Digital programs that can calculate the upper and lower bounds to the torsional vibrations of such free, non-uniform shafts and can accept input data in standard eng...

The carbon dioxide absorption bands between 12 and 18 microns are of great importance for atmospheric long wave radiative transfer. Theoretical calculations require an accurate knowledge of the frequencies, intensities and half-widths of the individual ab...

A functional form is derived for the efficiency of current drive in toroidal geometry with low frequency waves (frequencies below the electron cyclotron frequency). By fitting constants in order to duplicate numerical results for the efficiency we obtain an accurate function which will be useful for computer ...

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 impedance contours which ...

We study the current-controlled modulation of a nanocontact spin-torque oscillator. Three principally different cases of frequency nonlinearity ( d2f/dIdc2 being zero, positive, and negative) are investigated. Standard nonlinear frequency-modulation theory is able to accurately describe the frequency shifts during ...

We have performed calculations of the size of the frequency shift induced by a static electric field on the clock transition frequencies of the hyperfine splitting in Yb{sup +}, Rb, Cs, Ba{sup +}, and Hg{sup +}. The calculations are used to find the frequency shifts due to blackbody radiation ...

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

An approximate first-order expression for modeling frequency-dependent friction of unsteady pipe flow with high-viscosity fluid has been deveoped with the method of nonlinear square integral optimum in the frequency domain. This simple expression of first-order lag elements is more accurate and efficient than others in both the ...

Current rectification, i.e., induction of dc current by oscillating electromagnetic fields, is demonstrated in molecular junctions at an optical frequency. The magnitude of rectification is used to accurately determine the effective oscillating potentials in the junctions induced by the irradiating laser. Since the gap size of the junctions used in this ...

... Accession Number : ADA351999. Title : The Calculation of the Natural Frequency of a Cantilever Monoplane Wing. Corporate ...

... Title : CALCULATED NATURAL FREQUENCIES AND NORMAL MODES OF VIBRATION OF THE USS OKINAWA (LPH-3),. ...

Presented is a method to blindly estimate the location of a transmitter from the signal observed by a single moving receiver. This process is based on the observation that the observed Doppler characteristics are essentially uniquely determined by the transmission frequency, the location of the transmitter, and the time-varying flight path of the receiver. We ...

Diodes have been used for years as rectifiers, but due to forward voltage drop, accuracy is poor. Three methods of computing rectifier error based upon exponential models of the PN junction current-voltage characteristics are presented. An iterative hand analysis provides accurate prediction of rectifier performance at midband frequencies. To include ...

We discuss the importance of accurate numerical calculation of elastic modes in the mirrors with suspension �ears� in advanced LIGO interferometer to enable precise predictions of parametric oscillatory instability problem. We show that �ears� of test masses produce additional shift of elastic modes frequencies which is larger ...

Principle of a new type of recirculating electron accelerator suitable for industrial applications, the Rhodotron accelerator, are presented. A boundary integral method using Green function is presented which allows to compute accurately the resonance fre...

Electric dipole polarizabilities of atoms are very important in many different physical applications, such as the precision atomic frequency standard. Calculations of these properties are very important and challenging. We propose a calculation strategy to calculate the frequency dependent ...

The relativistic coupled-cluster single-double method is used to calculate the dependence of frequencies of strong E1 transitions in many monovalent atoms and ions on the fine-structure constant {alpha}. These transitions are used in the search for manifestations of the variation of the fine-structure constant in quasar absorption spectra. Results of the ...

A method is proposed for calculating correlations for impurity diffusion. The method can be applied to any lattice, isotropic or anisotropic, and permits all symmetrically inequivalent dissociative jump frequencies to be uniquely specified without adding to the complexity of the calculation. The method is compared with other ...

Space charge wave parameters were calculated without using the simplified assumption /sub II/ < and considering relativistic effects. The method can be used for accurately evaluating propagation constants, frequency, wavelength of space charge, and electron conductance introduced by a beam in a resonator. (R.V.J.)

... Abstract : The natural frequencies are calculated for a metallic ... ELECTROMAGNETIC PROPERTIES, RESONANT FREQUENCY, RODS, ...

... Abstract : The natural frequencies and normal modes of ... NUMERICAL ANALYSIS, RESONANT FREQUENCY, MATHEMATICAL ANALYSIS ...

We perform accurate calculations of the dependence of transition frequencies in two-valence-electron atoms and ions on a variation of the fine-structure constant, {alpha}=e{sup 2}/({Dirac_h}/2{pi})c. The relativistic Hartree-Fock method is used with many-body perturbation theory and configuration interaction methods to ...

In this paper we present an approach to calculate the time-varying equivalent inductance and resistance of helical flux compression generators accurately. This approach is based on the 2D filamentary method and uses the dynamic matrix concept. By using this method, it is possible to consider both the effects of the armature presence and ...

The paper presents a methodology for the closed form calculation of electromagnetic transients in power system networks, resulting from sequential switching operations. The system is viewed from the terminals of the switch poles where a compensating voltage source is applied for closing and a compensating current source is applied for opening of a pole. The network, with ...

We recently presented very accurate calculations of the fundamental vibrational frequency of the (7)LiH(+) and (3)He(4)He(+) ions [Stanke et al. Phys. Rev. A 79, 060501(R) (2009)] performed without the Born-Oppenheimer approximation and included leading relativistic corrections. The accuracy of those calculations ...

We recently presented very accurate calculations of the fundamental vibrational frequency of the 7LiH+ and 3He4He+ ions [Stanke et al. Phys. Rev. A 79, 060501(R) (2009)] performed without the Born-Oppenheimer approximation and included leading relativistic corrections. The accuracy of those calculations was ...

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 ...

At the request of the Risk Analysis Group (RAG), and in support of the Tritium Facilities SAR, the Safety Information Management and Analysis group (SIMA) determined specific frequency values dealing with tritium releases and fire related incidents. All results summarized herein are based upon actual facility operating data from the Tritium Fault Tree Databank. The Descriptive ...

At the request of the Risk Analysis group (RAG), and in support of the DWPF SAR, the Safety Information Management and Analysis group (SIMA) determined specific frequency and unavailability values dealing with contamination and fire related incidents. All results summarized herein are based upon actual facility operating data from the 200-Area Fault Tree Data Bank. The SAS ...

When planning the design of high-current FODO transport for accelerators, it is useful to have simple, accurate tools for calculating quantities such as the phase advances {sigma}{sub 0} and !given the lattice and beam parameters. Along with the KV beam model, the smooth approximation is often used. It is simple but not very accurate ...

The long-range (nonretarded) van der Waals coefficients for two and three helium atoms are determined by an integration over imaginary frequencies of helium dynamic polarizabilities. An analytic form for the dynamic polarizability as a function of frequency is generated by the Pad�-approximant method from accurate numerical values ...

Title: Calculating accurate aboveground dry weight biomass of herbaceous vegetation in the Great Plains: A comparison of three calculations to determine the ...

Measurements of sky luminance in various meteorological conditions were taken in three localities: Arcavacata di Rende (Italy), Lyon (France) and Osaka (Japan), by means of a sky scanner. The data were compared with Perez, Igawa and CIE luminance calculation models. The analysis of the comparison shows that the best luminance predictions are obtained by the CIE model, but the ...

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...

HVDC converter stations generate radio frequency (RF) electromagnetic (EM) noise which could interfere with adjacent communication and computer equipment, and carrier system operations. In order to calculate and predict the RF EM noise produced by the valve ignition of a converter station, it is essential to develop accurate models of ...

For more than a decade the B isotopic compositions of marine carbonates have been used as paleo-pH proxies for seawater and to reconstruct paleo-[CO2] concentrations in the atmosphere. A necessary step is this process is the accurate determination of the equilibrium constant, K, for the reaction shown in the title above. This equilibrium constant has been recently ...

Linear and quadratic frequency shift coefficients were determined for the Q(1) and Q(2) lines of hydrogen using cw Coherent Anti-Stokes Raman Spectroscopy (CARS). The linear coefficients were accurate to three significant digits which is an order of magnitude better than any other published results. The quadratic coefficients were comparable to other ...

Gas-phase NMR spectra of 11B, 10B, and 19F in BF3 are reported, and high-level ab initio calculations of the corresponding NMR shielding constants are described. Extrapolation of the measured resonance frequencies to the zero-density limit ensures that the results correspond to the ab initio values for an isolated molecule. Simultaneous measurements of 3He ...

In this paper we report the infrared absorption spectrum of the phenyl radical in an argon matrix at 12 K and propose assignments for the frequencies and intensities for all of the 24 IR active modes. Our assignments are supported by ab initio electronic structure calculations. The results in this communication show that the phenyl radical can be cleanly ...

A single-equation model of long-wavelength drift waves has been used to study the behavior of turbulent plasma fluctuations in the presence of sheared flow. These waves, which have a real frequency, are calculated using a time-evolution algorithm that includes flow effects. Linear tests show that growth rates and flow-shear damping agree with the ...

Quantum molecular-time-scale generalized-Langevin-equation (MTGLE) theory is applied to calculate spectral linewidths and redshifts of a single vibron oscillator nonlinearly coupled by the Davydov Hamiltonian in the {alpha}-helix parameter regime to a chain of linearly coupled molecules. Exact values can also be calculated for this problem. The MTGLE ...

We have performed Car-Parrinello molecular dynamics (CPMD) calculations of the hydrogen-bonded NH3-HCl dimer. Our main aim is to establish how ionic-orbital coupling in CPMD affects the vibrational dynamics in hydrogen-bonded systems by characterizing the dependence of the calculated vibrational frequencies upon the orbital mass in the ...

We have performed Car-Parrinello molecular dynamics (CPMD) calculations of the hydrogen-bonded NH(3)-HCl dimer. Our main aim is to establish how ionic-orbital coupling in CPMD affects the vibrational dynamics in hydrogen-bonded systems by characterizing the dependence of the calculated vibrational frequencies upon the orbital mass in ...

This paper describes a modified version of the MCNP code, the MCNP-DSP. Variance reduction features were disabled to have strictly analog particle tracking in order to follow fluctuating processes more accurately. Some of the neutron and photon physics routines were modified to better represent the production of particles. Other modifications are discussed.

A simple, flexible, accurate, and comprehensive numerical method is presented for theoretically analyzing the diffraction field of a continuous wave transducer of arbitrary size, shape, and frequency. Using the extensively studied circular transducer for comparison, numerical results are shown for an unfocused transducer with uniform velocity excitation as ...

Octupole vibrntions of deformed even-mass nuclei are considered in terms of the collective model. The second quantization method is applied. It is shown that g-vibrations are accurately separnted from gamma vibrations for any frequency. The reduced probability for M2 transition from the g-band is calculated. (auth)

Generalized composite nonthermal line profiles are calculated for the thermospheric nighttime emission from O((1)S) metastable atoms based on an extension to the simple relaxation model of Hays and Walker. It is shown that the Dynamics Explorer Fabry-Perot interferometer will enable accurate values to be obtained for the branching ratio of the O((1)S) ...

We present a new method for sensitivity analysis of photonic crystal devices. The algorithm is based on a finite-difference frequency-domain model and uses the adjoint variable method and perturbation theory techniques. We show that our method is highly efficient and accurate and can be applied to calculation of the sensitivity of ...

Spin-polarized radio frequency (RF) currents and RF-Oersted fields resonantly excite a magnetic vortex core confined in a micron-scale soft magnetic disk. In this study, we measured the rectifying voltage spectra caused by the anisotropic magnetoresistance oscillation due to the gyration of the vortex with different polarity and chirality. The measured spectra are presented ...

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 problem of beam background in Squid Polarimetry is not without residual benefits. The authors may deliberately generate beam background by gently kicking the beam at the spin tune frequency. This signal may be used to accomplish a simple and accurate absolute calibration of the polarimeter. The authors present details of beam background ...

This paper describes an improvement of a conductor-subdivision-based method for calculating the frequency-dependent series impedance matrix of arbitrary cross-section conductors considering both skin and proximity effects. Analytical skin-effect formulas are available, but they are only for some simple conductor shapes and the proximity effect is ignored. ...

A matched asymptotic analysis of the system of equations governing the electrokinetic cell model of ref 4 (Ahualli, S.; Delgado, A.; Miklavcic, S.; White, L. R. Langmuir 2006, 22, 7041) is performed. Asymptotic expressions are obtained for the dynamic mobility and complex conductivity response of a dense suspension of charged spherical particles to an applied electric field. The asymptotic ...

The frequencies of the 2S-3S two-photon transition for the stable lithium isotopes were measured by cavity-enhanced Doppler-free laser excitation that was controlled by a femtosecond frequency comb. The resulting values of 815 618 181.57(18) and 815 606 727.59(18) MHz, respectively, for 7Li and 6Li are in agreement with previous measurements but are more ...

A method has been developed to calculate the current-density distribution, magnetic field, and inductance of rail-gun or flux-compression generator rails, or other long, parallel conductors of arbitrary cross section, in the high-frequency limit. The results represent initial estimates of these quantities in rail-gun circuits before current or ...

... was developed to evaluate the natural frequencies of model ... program, NATFREQ, calculates the uncoupled natural frequency and corresponding ...

... Title : CALCULATED NATURAL FREQUENCIES AND NORMAL MODES OF THE GUIDED MISSILE CRUISER USS LONG BEACH (CG(N)-9). ...

... Title : CALCULATED NATURAL FREQUENCIES AND NORMAL MODES OF VIBRATION ON RANGE INSTRUMENTATION SHIP (T-AGM-19). ...

... Title : A Fortran Program for Calculating the Frequencies and Mode Shapes of a Guided Clamped, Guided Pinned, Clamped, and Pinned Spherical ...

Numerical calculations show that useful information can be obtained in an electromagnetic crosswell survey where one of the wells is cased in steel. Our simple model is based on the assumption of an infinitely long uniform casing embedded in a homogeneous full space. Nevertheless the results indicate that if the pipe characteristics are independently known then the formation ...

Consideration of surface effects in microscaled and nanoscaled materials is important for accurate prediction of their dynamic behavior. In this study, the Timoshenko beam model is modified to include the surface effects and used to analyze the vibration of nanotubes as well as calculate their natural frequencies. The thin surface ...

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 ...

The blackbody radiation (BBR) shift is an important systematic correction for the atomic frequency standards realizing the SI unit of time. Presently, there is controversy over the value of the BBR shift for the primary 133Cs standard. At room temperatures, the values from various groups differ at the 3x10(-15) level, while modern clocks are aiming at 10(-16) accuracies. We ...

The blackbody radiation (BBR) shift is an important systematic correction for the atomic frequency standards realizing the SI unit of time. Presently, there is controversy over the value of the BBR shift for the primary {sup 133}Cs standard. At room temperatures, the values from various groups differ at the 3x10{sup -15} level, while modern clocks are aiming at 10{sup -16} ...

... 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 ...

In a plasma containing more than one ion species, the frequencies of the ion--ion hybrid resonances can be a sensitive measure of the densities of the minor species, but only if the frequency shifts caused by electron motions are small, as experimental observations suggest. By calculating the eigenfrequencies for ion--ion hybrid waves ...

The design, operating parameters and the accuracy evaluation of the NPL Rb atomic fountain are described. The atomic fountain employs a double magneto-optical arrangement that allows a large number of 87Rb atoms to be trapped, a water-cooled temperature-stabilized interrogation region and a high quality factor interrogation cavity. From the uncertainties of measured and ...

This paper provides empirical formulas for rapidly calculating the resonant frequencies of an orthotropic, rectangular plate with its edges constrained by elastic supports. In particular, the classical boundary condition with guided supports at its edges is considered. Other boundary conditions, such as the guided-free edges, guided-clamped edges and ...

Gravity gradient noise generated by seismic displacements constitute a limiting factor for the sensitivity of ground based gravitational wave detectors at frequencies below 10 Hz. We present a finite element framework to calculate the soil response to various excitations. The accompanying gravity gradients as a result of the seismic displacement field can ...

Possible approaches to thermal wave measurement of thermal diffusivity were considered. The calculation of the transverse photodeflection signal in the framework of wave optics proves to be a more accurate approach compared to that of geometrical optics. The influence of the account of wave optics effects on the accuracy of the thermal diffusivity ...

Capacitive micromachined ultrasonic transducers (CMUTs) have been developed for airborne ultrasonic applications, acoustic imaging, and chemical and biological detections. Much attention is also paid how to optimize their performance, so that the accurate simulation of the transmitting response of the CMUTs becomes extremely significant. This paper focuses on determining the ...

We use the numerical renormalization group method (NRG) to investigate a single-impurity Anderson model with a coupling of the impurity to a superconducting host. Analysis of the energy flow shows that, contrary to previous belief, NRG iterations can be performed up to a large number of sites, corresponding to energy differences far below the superconducting gap ?. This allows us to ...

We discuss the importance of accurate numerical calculation of elastic modes in the mirrors of Advanced LIGO to enable precise predictions of the problem of parametric oscillatory instability. We propose accuracy estimations through use of analytical solutions based on Chree Lamb modes. Small deviations from cylindrical test mass shape may produce ...

The microwave spectrum of the sugar alcohol 1,2-propanediol (CH3CHOHCH2OH) has been measured over the frequency range 6.5-25.0 GHz with several pulsed-beam Fourier-transform microwave spectrometers. Seven conformers of 1,2-propanediol have been assigned and ab initio electronic structure calculations of the 10 lowest energy forms have been ...

The purpose of this paper is to present results of a simplified approach to the dynamic finite element modeling of composite girder-slab bridges using a single beam element to represent the girder-slab cross section. Dynamic properties calculated with these simplified models are compared to experimental results and results obtained from more detailed shell element models. The ...

A theory of the low-frequency phase fluctuations in the output of a semiconductor laser due to spontaneous emission is developed. The theory can be used as a tool to numerically calculate the linewidth of complicated laser structures, e.g., by use of the transfer matrix formulation. The results for the single Fabry-Perot laser are shown to be in exact ...

A method of determining molecular eigen-frequencies based on the function of Einstein expressing the

Thick Frequency Selective Surface with Rectangular Apertures (TFSSRA) was developed to calculate the

... of the Cyclotron Frequency in ... (Author). Descriptors : *GYROTRONS, FREQUENCY, COMPUTATIONS ... STREAMS, MAGNETRONS, CYCLOTRONS. ...

... of repetitions provides the natural frequencies to any ... Descriptors : *BEAMS(STRUCTURAL), *RESONANT FREQUENCY, DYNAMICS, MASS ...

... the natural frequencies of a cantilever plate in a fluid. Without requiring additional calculations, the formula reveals the frequency dynamics as a ...

... ie, Army, Navy, Air Force) service ... COMPUTING FREQUENCIES AND RELATIVE INTENSITIES FOR ... is described which calculates the frequencies ...

... Natural frequencies, Cylinder, Submerged, Structures, Finite elements ... NUMERICAL ANALYSIS, RESONANT FREQUENCY, FRENCH LANGUAGE ...

... a simple theoretical analysis for determining the natural analytical frequencies of thin ... 7. Procedure yields a cubic frequency equation. ...

... Accession Number : ADP023738. Title : Time-Accurate Calculations of Free-Flight Aerodynamics of Maneuvering Projectiles. ...

... Time Accurate Euler Calculations of Vortical Flow over a Delta Wing in Rolling Motion ... [11] for a rolling delta wing at high incidence), the last ...

... Title : An Accurate and Efficient Method to Calculate the Rate of Single Event Upsets from the LET Spectrum and SEU Cross Section Test Results. ...

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 ...

We show how the results of classical molecular-dynamics simulations can be used to improve the calculation of quantum spectral densities of anharmonic crystals. In particular we show that the spectral density [ital C]([ital k],[omega]) of the displacement correlation function for a quantum chain of [ital N] atoms interacting through a nearest-neighbor Lennard-Jones potential, ...

More accurate variational calculations of the lowest three pure vibrational states (v=0,1,2) of the {sup 4}HeH{sup +} molecular ion have been carried out without assuming the Born-Oppenheimer approximation. In the calculations we included the complete set of {alpha}{sup 2} relativistic corrections, i.e., mass-velocity, Darwin, ...

For transition metals at temperatures to melting, the electronic entropy is calculated from linear muffin-tin orbital electronic densities of states (using both the atomic-sphere approximation as well as a full potential), the quasiharmonic entropy is calculated from neutron-scattering data, and the anharmonic entropy is then extracted from the measured ...

... Title : NOMOGRAPH FOR THE RAPID CALCULATION OF APPARENT FREQUENCY OF SOUND ARISING FROM THE DOPPLER EFFECT. ...

Calculated time-domain waveforms and frequency spectra are presented for three of the most important

... FLAWS ACCURATELY WITH ULTRASONICS, IT IS NECESSARY TO HAVE SUFFICIENT RESOLUTION IN EITHER THE TIME OR FREQUENCY ...

Previous studies show that phonation onset occurs as two eigenmodes of the vocal folds are synchronized by the interaction between the vocal folds and the glottal flow. This study examines the influence of the geometrical and biomechanical properties of the vocal folds on this eigenmode-synchronization process, with a focus on phonation threshold pressure and frequency. The ...

Relations between various values of the internal friction (tg{delta}, Q{sup -1}, Q{sup -1*}, and {lambda}/{pi}) measured by free decay and forced vibration are analyzed systemically based on a fundamental mechanical model in this paper. Additionally, relations between various natural frequencies, such as vibration frequency of free decay {omega}{sub FD}, ...

Monochromatic opacities from the OPAL database have been used to calculate radiative accelerations for the 21 included chemical species. The 10{sup 4} frequencies used are sufficient to calculate the radiative accelerations of many elements for T{gt}10{sup 5}K, using frequency sampling. This temperature limit is ...

The implementation of the angular spectrum approach based on the two-dimensional fast Fourier transform is evaluated for near-field pressure simulations of square ultrasound transducers, where the three-dimensional pressure field is calculated from the normal velocity distribution on the transducer surface. The pressure field is propagated in the spatial ...

The spectrum of the gravitational wave background originating from quantum fluctuations during inflation is calculated numerically for various inflation models over a wide range of frequencies. We take into account four ingredients: the scalar field dynamics during inflation making no use of the slow-roll approximation, the fermionic decay of the scalar ...

A dielectric-coated metal wire with an intervening air gap between the conductor and inner surface of the dielectric is presented and demonstrated by theoretical calculation at terahertz frequencies. The characteristic equation of such a modified Goubau surface-wave transmission line is derived for the general case of a lossy dielectric and imperfect ...