... Power losses were larger than anticipated and indicate that a more sophisticated analytical model is necessary for accurate sizing of gas spring ...

... This paper models the equilibrium solutions for a laser ... the peak density, velocity, and temperature of the ... and the distance to the critical surface on ...

Many seismic problems involve interfaces. Seismic modeling provides a means of passing from the mathematical formulation to the solution of such problems when suitable analytical techniques are not available. Accurate interface formulations are necessary ...

2.7 Charged Particle Environment Models. Accurate, reliable analytical models of the Earth's charged particle environment are difficult ...

As disk arrays become widely used, tools for understanding and analyzing their performance become increasingly important. In particular, performance models can be invaluable in both configuring and designing disk arrays. Accurate analytic performance mode...

laser beam propagation in fractal cloud models, a bias that is captured accurately by the analytical approach used by Davis et al. ...

This unique approach models the pore-pressure development during pyrolysis more accurately than current analytical methods since it couples the ...

Jun 25, 2003 ... Furthermore, modeling of the voids collected via NDE offered an analytical advantage that resulted in more accurate assessments of the ...

tions of received optical signal and background power in optical communications sys- tems, with emphasis on analytic models for accurately predicting ...

geometry, ion optics performance and electrical inputs such as discharge voltage and currents, etc. to produce accurate performance curves of discharge loss ...

... and compares measured and predicted vehicle performance in ... rigid obstacle tests with the two vehicles. ... accurate predictions of the speed at which ...

The models are compact analytic functions, finite over the entire domain of elevation angle, and accurate over large ranges of pressure, temperature, ...

The saturation development equation is solved analytically to give a solution that is more general than the existing analytical solution. This analytical solution provides accurate predictions of the saturation ratio and allows the use of relatively large time steps for the simulation of condensation processes. A ...

An Efficient Analytical Model for WiMAX Networks with Multiple Traffic Profiles Bruno Baynat@enst.fr ABSTRACT In this paper, we present a simple and accurate analytical model for performance evaluation of WiMAX allows us to carry on a preliminary performance study. 1. INTRODUCTION WiMAX ...

There has been no accurate procedure for modeling the high-speed impact of composite materials, but such an analytical capability will be required in designing reliable lightweight engine-containment systems. The majority of the models in use assume a lin...

Modeling and simulation of structural impacts into soil continue to challenge analysts to develop accurate material models and detailed analytical simulations to predict the soil penetration event. This paper discusses finite element modeling of a series ...

with the 311 defect model. The results are depicted in Figs. 12 and 13. Since all im- plants in this data setA combined model for ^311 defect and dislocation loop evolution: Analytical formulation of kinetic for publication 30 November 2001 Accurate modeling of extended defect kinetics is of ...

The main objective of this exploratory project was to evaluate the possibility of creating an accurate and flexible analytical model to predict the properties of Concrete Asphalt mixtures by the use of particle composite theory. The proposed work was to b...

A combination of accurate, selected analytical determinations and a competent geochemical model constitutes the only possible means of achieving a sufficiently thorough and reliable aqueous speciation of waters for the evaluation of societal risks resulti...

Aspiration efficiency of particles from a flowing airstream into a thin-walled sampling inlet is accurately predicted using a numerical model. he model combines the Boundary Integral Equation Method for predicting the velocity field into the inlet with an analytical solution to t...

Sarbazi-Azad,S. Ould-Khaoua,M. Journal of Simulation Modelling: Practice and Theory, to appear Elsevier Science

In this paper, a crosstalk expression and equivalent circuit model have been proposed based on RLC line model and interconnect parameters for wire-bonded and flip-chip bonded multichannel optoelectronic modules. The analytical expression and model are accurate for computing crosstalk of ...

... Title : ANALYTIC SOLUTIONS TO THE EQUATIONS OF MOTION ... very accurately by the approximate solutions. An alternate solution for the modal ...

An apparatus and method for monitoring a process involve development and application of a statistically qualified neuro-analytic (SQNA) model to accurately and reliably identify process change. The development of the SQNA model is accomplished in two stages: deterministic model adaption and ...

An apparatus and method for monitoring a process involves development and application of a statistically qualified neuro-analytic (SQNA) model to accurately and reliably identify process change. The development of the SQNA model is accomplished in two steps: deterministic model adaption and ...

Calculation of s-wave resonances by means of the analytical continuation in the coupling constant is a difficult problem because the position of the critical bifurcation point is unknown. Here we propose a new variant of the method of analytical continuation which avoids this problem completely. The method is applied to a model case ...

We present an analytic model for the barrier transmission coefficient that can be used to calculate the tunnelling magnetoresistance (TMR) for metal-insulator-metal systems. It removes the approximations inherent in the Simmons� and Brinkman models currently used to fit experimental systems that give much lower predictions of the ...

A previously proposed model for representing the retention factor (k) of an analyte in mixed solvent mobile phases was extended to calculate the k of different analytes with respect to the nature of analyte, organic modifier, its concentration and type of the stationary phase. The accuracy of the proposed method ...

An approach for fast and accurate carrier profiling using deep-depletion analytical modeling of scanning capacitance microscopy (SCM) measurements is shown for an ultrashallow p-n junction with a junction depth of less than 30 nm and a profile steepness of about 3 nm per decade change in carrier concentration. In addition, the ...

A Semi-Analytical Finite Element (SAFE) method is developed to model accurately the propagation velocity and leakage of guided waves along an immersed waveguide with arbitrary non-circular cross-section. Thus an accurate inverse model is provided to measure the density of the fluid by measuring ...

An analytical technique is outlined for predicting the blast wave from a rapid but asymptotic expansion of an inner piston-like surface. The method more accurately describes real blasts compared to conventional point source models and agrees favorably wit...

High-Power Microwave coupling into targets of interest is extremely difficult to assess analytically or numerically. The practicalities of accurately modeling physical structures, as well as the subtlety of determining which simplifications are allowable ...

Full scale testing to date has verified that current analytical tools and the use of scale model testing are both accurate methods for predicting shipping cask response to severe accident conditions. The containers tested are capable of surviving severe transportation accidents.

Detailed performance testing of an air and a liquid type combined photovoltaic/thermal (PV/T) collector has been completed with results of accompanying analytical modeling accurately predicting the experimental data. Thermal efficiencies, with concurrent ...

Calculated dynamic characteristics of a representative soft-inplane hingeless rotor helicopter are presented. The flight dynamics as a function of speed and gross weight are given. The requirements for accurate analytical modelling of this helicopter are ...

Analyses of the statistical properties of electromagnetic scattering from random rough surfaces for finite clutter cells have assumed that the rough surface can be modeled by a Gaussian correlation function. However, some real surfaces are more accurately...

This study examines the technical and economic aspects of a regenerative braking/flywheel energy storage subway system. In order to define the analytical models accurately, it was necessary to gather data on the trains, rail network, schedules, and ancill...

Binary neutron-star systems represent one of the most promising sources of gravitational waves. In order to be able to extract important information, notably about the equation of state of matter at nuclear density, it is necessary to have in hands an accurate analytical model of the expected waveforms. Following our recent work, we ...

This paper describes an analytical model for bulk electron mobility in strained-Si layers as a function of strain. Phonon scattering, columbic scattering and surface roughness scattering are included to analyze the full mobility model. Analytical explicit calculations of all of the parameters to ...

An Efficient Analytical Model for the Dimensioning of WiMAX Networks Bruno Baynat1 , Georges for performance evaluation of WiMAX networks. The need for accurate and fast-computing tools is of primary thousands of evaluations, which would not be tractable with any simulation tool. Key words: WiMAX

Nowadays, the switched reluctance machine are widely used. To determine their performances and to elaborate control strategy, we generally use the linear analytical model. Unhappily, this last is not very accurate. To yield accurate modelling results, we use then numerical ...

A new analytic model is presented which accurately estimates the radially averaged axial component of the space-charge field of an axisymmetric heavy-ion beam in a cylindrical beam pipe. The model recovers details of the field near the beam ends that are overlooked by simpler models, and the ...

Huffaker and Cohen (ref.1) claim that the perturbed-Morse-oscillator (PMO) model, for the potential energy function for hydrogen, gives very high accuracy results; surpassing that of the RKR potential. A more efficient approach to formulating analytical functions based on the PMO model is given, and some defects of the PMO ...

As part of the Defense Nuclear Agency project Jl1 AAXPX231 to study the behavior of the ferroelectric radiation detector, an analytical model of the energy balance within a ferroelectric crystal has been developed. This model relates ionic spacing and charges to macroscopic quantities such as the pyroelectric and piezoelectric ...

This report describes the development and verification of an analytical model to study the dynamic interaction between a moving maglev-type vehicle and its supporting flexible guideway, referred to as vehicle/guideway interaction (VGI). The theoretical basis and computer coding for the model are described in detail. For verification ...

An accurate analytical model for the change in resistance of a piezoresistor is necessary for the design of silicon piezoresistive transducers. Ion implantation requires a high-temperature oxidation or annealing process to activate the dopant atoms, and this treatment results in a distorted dopant profile due to diffusion. Existing ...

We report a method for evaluating the performance of model observers for decompressed images in analytical form using compression noise statistics. It derives test statistics and detectabilities for the ideal observer, the nonprewhitening observer, the Hotelling observer, and the channelized Hotelling observer (CHO) on decompressed images. The derived CHO ...

Allison, M., 1997: Accurate analytic representations of solar time and seasons on Mars with applications to the Pathfinder/Surveyor missions. Geophys. Res. ...

An equivalent circuit method is developed for modeling a coplanar waveguide (CPW) with the optical probe structure in electrooptical sampling sytems, which takes into account the geometry and the material properties of the system. In this approach, the influence of the optical probe to S parameters of the CPW test structure is modeled by an equivalent ...

This paper presents a modelling of a Transverse Vernier Hybrid Reluctance Motor (TVHRM). The geometry of the magnetic circuit of this latter is especially 3D. The use of the 3D finite element method to do the analysis and to predetermine the motor characteristics is more accurate, but with an important computational time which makes unpractical a ...

We verify numerically and experimentally the accuracy of an analytical model used to derive the effective nonlinear susceptibilities of a varactor-loaded split ring resonator (VLSRR) magnetic medium. For the numerical validation, a nonlinear oscillator model for the effective magnetization of the metamaterial is applied in conjunction ...

The computational modeling of the biodegradation of contaminated groundwater systems accounting for biochemical reactions coupled to contaminant transport is a valuable tool for both the field engineer/planner with limited computational resources and the expert computational researcher less constrained by time and computer power. There exists several ...

... Title : SIMPLE AND ACCURATE CALIBRATION MODEL FOR HYDROGEN- CONTENT, BETA-PARTICLE BACKSCATTER GAUGES. ...

... CONTRACT NUMBER Analytical and Kinetic Modeling of Ablation Process (Preprint) ... Analytical and kinetic modeling of ablation process (Preprint) ...

Photon transport in complex biological tissues is most accurately predicted via Monte Carlo (MC) modeling methods, which often require lengthy computation times. In this report, a semi-analytical technique (henceforth referred to as PI-scaling) was derived that combines MC simulation, absorption scaling, and path integrals (PI) to ...

To improve the current status of home multilayer optical coating design with low speed and poor efficiency when a large layer number occurs, the accurate calculation and fast realization of merit function�s gradient and Hesse matrix is pointed out. Based on the matrix method to calculate the spectral properties of multilayer optical coating, an analytic ...

We have investigated the transmission and reflection properties of structures incorporating left-handed materials with graded index of refraction. We present an exact analytical solution to Helmholtz' equation for a graded index profile changing according to a hyperbolic tangent function along the propagation direction. We derive expressions for the field intensity along the ...

The field of plasma modeling is in need of reliable electron impact ionization cross sections. This work aims to provide accurate analytical fits for the most common atomic species found in material processing plasmas, such as Argon and halogen elements like Fluorine and Chlorine, etc. The standard BELI formula is revisited but a few ...

For short monopoles in this low-power case, it has been shown that a simple circuit model is capable of accurate predictions for the shape and magnitude of the antenna response to lightning-generated electric field coupling effects, provided that the elements of the circuit model have accurate values. Numerical EM ...

For certain random vibration loads, crack growth may be adequately estimated with random load models that ignore sequence effects. ASTM test results have been accurately predicted from narrow-band (Rayleigh) load models; analytical results may also includ...