... Accession Number : ADA534986. Title : Accurate Modeling of Ionospheric Electromagnetic Fields Generated by a Low Altitude VLF Transmitter. ...

... Accession Number : ADA396425. Title : Accurate Multiresolution Modeling of the Earth's Gravitational Field. Descriptive ...

... The model accurately represents the total magnetospheric magnetic field for conditions of low magnetic activity and to a geocentric distance of 15 ...

... 2. discretization required to model the fluctuations within the random field x and ensure that the resulting discretized equations are an accurate ...

... Abstract : An accurate technique to measure the complex permittivity of materials ... the development of models to predict the dielectric parameters of ...

A detailed and accurate earth gravity field model is important to the understanding of the structure and composition of the earth's crust and upper mantle. Various satellite-based techniques for providing more accurate models of the gravity field are anal...

Jul 7, 1980 ... netic field, reentered the Earth's atmos- phere early last month after providing . the most accurate model of the Earth's geomagnetic field ...

The goal of this project is to accurately predict the high altitude wave energy generated by low altitude VLF sources. We applied full-wave finite difference numerical models of the electromagnetic fields in both time and frequency domain to compute the V...

... Their model, which countered the very soul of Darwinian evolution, proved both accurate and versatile and was quickly adapted in the fields of ...

... altitudes are resolved coarsely and only the highest altitudes are resolved finely, is the key to achieving efficient simulations of high-altitude fields. ...

... Field theoretic methods such as self-consistent field theory have been used to accurately model the self-assembly behavior for a variety of dense ...

... Figure 8. Comparisons of LWPC and FDTD predictions of low altitude 25.2 kHz vertical electric fields as a function of range from the transmitter. ...

the DOK model, which is much easier to calculate, is accurate enough in most cases to .... In the DOK model. 7 is the reversible zero-field susceptibility ...

A review of the cosmological term problem is presented. Baby universe model and the compensating field model are discussed. The importance of more accurate data on the Hubble constant and the Universe age is stressed. 18 refs.

In order to develop accurate distributed hydrological models, spatially accurate meteorological forcing fields are required. In mountainous basins, elevation and topography strongly influence temperature, precipitation, vapor pressure, and wind. At the watershed scale, temperature, precipitation, ...

Advanced air quality simulation models, such as CMAQ, as well as other transport and dispersion models, require accurate and detailed meteorology fields. These meteorology fields include primary 3-dimensional dynamical and thermodynamical variables (e.g., winds, temperature, mo...

Accurate temporal and spatial estimation of land surface temperatures (LST) is important for modeling the hydrological cycle at field to global scales because LSTs can improve estimates of soil moisture and evapotranspiration. Using remote sensing satellites, accurate LSTs could be routine, but unfo...

The goal of this project is accurate prediction of high-altitude fields generated by low-altitude VLF sources to understand their influence on radiation belt dynamics. We applied a full-wave finite difference numerical model of the electromagnetic fields ...

Anticipating the increasing demands for ocean locations, the Technical Service of Construction and Navy Weapons has proceeded together with the National Center for Space Studies (CNES) to study the field of the earth's gravity towards an accurate determin...

... and accurate model predictions during typical hurricane and typhoon ... wind vector field in tropical cyclones, such as hurricanes and typhoons ...

The investigation of the stationary condition of a laser is approached by considering the state of the electromagnetic field as a collection of accurate normal oscillations. Solutions of Maxwell equations with approximate boundary conditions correspond to...

We have developed physiologically-based models that accurately predict the presence of more than a dozen tree species on thousands of field survey plots ...

Develop accurate and efficient particle codes; Compare kinetic and MHD plasmas; Ultimately: �correct� MHD fields using kinetic plasma currents, charges ...

Cadmium Zinc Telluride (CZT) detectors are the highest resolution room-temperature gamma ray detectors available for isotopic analysis. As with germanium detectors, accurate isotopic analysis using the spectra requires peak deconvolution. The CZT peak shapes are asymmetric, with a long low energy tail. The asymmetry is a result of the physics of the electron/hole transport in ...

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 ...

A quantitative model of the magnetospheric magnetic field and associated procedures for accurately cataloging charged-particle data out to and beyond geosynchronous orbit is developed. The magnetic field model incorporates all major magnetospheric current systems and is valid for all tilt ...

Models of the main geomagnetic field are generally represented by a scalar potential gamma expanded in a finite number of spherical harmonics. Very accurate observations of F were used, but indications exist that the accuracy of models derived from them i...

Many dynamical systems tested in the field and the laboratory display significant nonlinear behavior. Accurate characterization of such systems requires modeling in a nonlinear framework. One construct forming a basis for nonlinear modeling is that of the...

A simple, but accurate, formal volume density optical model is developed for volume rendering scattered data or scalar fields from the finite element method, as opposed to scanned data sets where material classification is involved. The model is suitable ...

A mesoscale model capable of treating variable terrain is described herein. The model, based on the hydrostatic and anelastic approximations, has been developed with a primary goal of providing, in real time, physically realistic and accurate wind fields ...

This paper describes revisions made to the Tokamak Systems Code to more accurately model high-field copper ignition devices. The major areas of revision were in the plasma physics model, the toroidal field (TF) coil model, and the poloidal field (PF) ...

Weather visualization is a difficult problem because it comprises volumetric multi-field data and traditional surface-based approaches obscure details of the complex three-dimensional structure of cloud dynamics. Therefore, visually accurate volumetric multi-field visualization of storm scale and cloud scale data is needed to ...

This paper describes revisions made to the Tokamak Systems Code to more accurately model high-field copper ignition devices. The major areas of revision were in the plasma physics model, the toroidal field (TF) coil model, and the poloidal field (PF) ...

The Tokamak System Code has been revised to more accurately model the plasma physics, the poloidal field coil/magnetohydrodynamic (MHD) systems, and the toroidal field (TF) coil system. The plasma physics model now uses a two-fluid representation of the electron-ion power balance and has a wide ...

The linear separable models of mesospheric circulation and structure developed in AD-A016 585 have been improved with the inclusion of the improved and more accurate heating functions obtained by Baker (1975). These models accurately simulate the observed zonal wind and temperature fields at ...

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

Wind tunnel studies are considered to be the most suitable method for studying near field dispersion, and methods for accurately modelling the nearfield behavior of a buoyant plume of gas are examined. The mean trajectory and rate of spread of a buoyant p...

Spatial pollutant patterns and peak concentrations are strongly influenced by meteorological parameters. herefore, accurate hourly, gridded meteorological data sets are crucial inputs for photochemical modeling. n effort has been underway to apply both diagnostic and dynamic mete...

Representing urban terrain characteristics in mesoscale meteorological and dispersion models is critical to produce accurate predictions of wind flow and temperature fields, air quality, and contaminant transport. A key component of the urban terrain representation is the charac...

The long range scientific goals of the proposed research comprise: (1) developing rigorous approaches to optimal combining satellite and drifter data with output of regional circulation models for accurate estimating the upper ocean velocity field and mix...

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

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...

Accurate determination of wind fields is a prerequisite for successful air quality modeling. Thus, there is an increasing demand for objective techniques for analyzing and predicting wind distribution, particularly over rugged terrain, where the wind patt...

Accurate determination of wind fields is a prerequisite for successful air quality modeling. Thus, there is an increasing demand for objective techniques for analyzing and predicting wind distribution, particularly over rugged terrain, where the wind patterns are not only more co...

The CREAMS (Chemicals, Runoff and Erosion from Agricultural Management Systems) model was evaluated for predicting runoff and sediment delivery from central Illinois fields without calibration. CREAMS was found to be fairly accurate in predicting annual r...

Accurate estimate of land surface temperature, a key parameter in surface energy balance models, requires knowledge of the surface emissivity. Emissivity dependence on soil water content has been already reported and modeled under controlled conditions at the laboratory. This study completes and ext...

To deepen understanding and hasten the development of treatments, cancer needs to be modelled more accurately in vitro; applying tissue-engineering concepts and approaches in this field could bridge the gap between two-dimensional studies and in vivo animal models.

The traditional least squares method for modeling seamount magnetism is often unsatisfactory because the models fail to reproduce the observations accurately. An alternative approach generate an external field in close agreement with the observed anomaly....

A critique of the most recent cavity growth models for underground coal gasification concluded that none of them can be used a priori on a specific experiment. Because the models have been adjusted to predict specific field test results, they cannot be applied successfully to field tests for which they have not ...

High precision mapping of the vacuum flux surfaces of the H-1NF heliac is carried out using electron-beam multi-wire tomography for various magnetic configurations and field strengths. The extreme accuracy of this technique has been exploited to understand the nature of error fields and to determine the best-fit empirical values for the H-1NF coil ...

High precision mapping of the vacuum flux surfaces of the H-1NF heliac is carried out using electron-beam multi-wire tomography for various magnetic configurations and field strengths. The extreme accuracy of this technique has been exploited to understand the nature of error fields and to determine the best-fit empirical values for the H-1NF coil ...

Prediction of radionuclide migration through soil and groundwater requires models which have been tested under a variety of conditions. Unfortunately, many of the existing models have not been tested in the field, partly because such testing requires accurate and representative data. This report provides the design ...

Accurate analysis and the ability to predict the complete response of particulate composite materials requires accurate inelastic constitutive models. However, to be of maximum utility, these inelastic models must be validated using quantifiable experimental results. The Asay Impact Test is an impact experiment ...

A phase-field model for grain growth is briefly described. In this model, a poly-crystalline microstructure is represented by multiple structural order parameter fields whose temporal and spatial evolutions follow the time-dependent Ginzburg-Landau (TDGL) equations. Results from phase-field ...

A portable spectrometer prototype is built to study wavelength calibration for flat-field grating spectrometers. An accurate calibration method called parameter fitting is presented. Both optical and structural parameters of the spectrometer are included in the wavelength calibration model, which accurately ...

Thermal modeling of a nuclear waste repository is basic to most waste management predictive models. It is important that the modeling techniques accurately determine the time-dependent temperature distribution of the waste emplacement media. Recent modeling studies show that the time-dependent ...

The behavior of orbits in charged-particle beam transport systems, including both linear and circular accelerators as well as final focus sections and spectrometers, can depend sensitively on nonlinear fringe-field and high-order-multipole effects in the various beam-line elements. The inclusion of these effects requires a detailed and realistic model of ...

MAGSAT data were used to construct a variety of spherical harmonic models of the main geomagnetic field emanating from Earth's liquid core at poch 1980. These models were used to: (1) accurately determine the radius of Earth's core by a magnetic method, (...

The geomagnetic field is an important parameter in space physics. The International Geomagnetic Reference Field (IGRF) is a model of the Earth's main field. Current sources in the ionosphere, the interplanetary magnetic field, annual and diurnal variation, and other sporadic and unmodeled ...

The accuracy of modeling soil water storage by two hydrologic models, CREAMS and HELP, was tested by comparing simulation results with field measurements of soil moisture in eight experimental landfill cover systems having a range of well-defined soil profiles and vegetative covers. Regression analysis showed that CREAMS generally ...

The modeling of fusion plasmas requires the accurate modeling of the fields which confine these plasmas. BSC/T is a Fortran module which allows for accurate and expedient computation of these fields from the currents which produce them. Near field ...

The Gravity field and steady-state Ocean Circulation Explorer (GOCE) is one of the flagships in ESA's Living Planet Programme. With the help of the on-board, very precise gravitational gradiometer the Earth's gravity field is to be determined with unprecedented accuracy. The gradiometer measures gravity field differences that are ...

Accurate modeling of wind turbine systems is of paramount importance for controls engineers seeking to reduce loads and optimize energy capture of operating turbines in the field. When designing control systems, engineers often employ a series of models developed in the different disciplines of wind energy. The ...

Highly accurate elective field maps, gas density measurements, and a model of ion transport were combined to determine the current balance at the surface of a cold aluminum cathode. The ratio of ion to electron current was found to be 3.3 at the cathode s...

shown to be accurate for wind speed of up to at least 20 m/s. The global wind fields from QuikSCAT have been routinely assimilated into the numerical weather ...

In the study the speed limits of potential flow part of SHIPFLOW computational fluid dynamics program were found out. It was also evaluated how accurate and reliable the program is when calculating the flow field of a fast ship with immersed transom stern...

The reflectivity of light incident upon the exposed face of a semi-infinite crystal is calculated, using the point-dipole model. This requires an accurate solution for the polariton modes near the crystal surface. The variation of the Lorentz local field,...

Modifications that allow for more accurate modeling of flow fields when strong shocks are present were made into three dimensional transonic small disturbance (TSD) potential theory. The Engquist-Osher type-dependent differencing was incorporated into the...

Geodetic satellites such as GEOSAT, SPOT, ERS-1, and TOPEX/Poseidon require accurate orbital computations to support the scientific data they collect. Until recently, gravity field mismodeling was the major source of error in precise orbit definition. How...

The in-flight attitude and vector magnetometer data bias recovery techniques and results are described. The attitude bias recoveries are based on comparisons with a magnetic field model and are thought to be accurate to 20 arcsec. The vector magnetometer ...

The general objective of computer driver adaptive testing is to accurately estimate an individual's position on the underlying trait the test purports to measure. Conventional paper-and-pencil test administration typically suffers from several sources of ...

Progress in the use of MAGSAT data to confirm that the radius of the Earth's core-mantle boundary can be accurately determined magnetically is reported. The MAGSAT data was used in conjunction with a high quality manfield model for epoch 1965. The unsigne...

... and implemented to solve the problem of accurately estimating logging costs by region. The methodology blends field time and motion data, simulation analysis, non-linear regression models, and detailed fee...

Accurate modeling of near-field wave propagation is critical to determine blast wave overpressure of large caliber muzzle brakes. Experimental testing to determine blast overpressure is costly, making computational fluid dynamics (CFD) simulations of thes...

In this report, we show that the target resistance of brittle materials can be calculated accurately using spherical cavity expansion analysis and a conventional brittle material model. The stress field ahead of the tip of the penetrator is assumed to hav...

The long-term goal of this project is to improve the prediction of tropical cyclone (TC) genesis, structure and intensity changes through improved understanding of the fundamental mechanisms involved. The accurate prediction of TC genesis, structure and i...

First accurate (within 10% absolute) radiance calibration standard for all imaging ... 1989, Rossow 1989), revised radiative model based on results of special field ... First global surveys of mean droplet sizes in liquid water clouds (Han et al. ...

A method for accurately determining the orbits of near-equatorial, near-synchronous satellites is presented. The basic approach is to supplement the conventional spherical harmonics representation of the terrestrial gravity field with a forcing function h...

Recently there has been renewed interest in using field ionization as a method of detecting neutral atomic/molecular species. However, the current�voltage characteristic of a field ionization detector is very difficult to calculate from first principles, making comparison, characterization and monitoring difficult. Here we present a semi-empirical theory ...

... Unsteady or time-accurate CFD modeling Competent smart munitions that can more accurately hit a ... cubic k-& model, depending on grid fineness. ...

... Title : Accurate Pairing Treatment of the Coulomb Interaction in the Anderson Model of a Localized Moment in a Metal. ...

... Title : ACCURATE DETERMINATION OF THE MOMENT OF INERTIA AND CENTER OF GRAVITY POSITION OF WIND TUNNEL MODELS. ...

Magsat, designed for making measurements of the geomagnetic vector field, is evaluated. For accurate

An end-to-end modelling program for an astrometric telescope employing a Ronchi ruling has been developed. The program models the aberrated images formed anywhere in the field-of-view. It then determines apparent centroids by simulating the motion of a Ronchi ruling across the field. Photo-electron statistics are ...

Although many microenvironmental factors contribute to the color shift of light emission from the firefly chromophore, the dominant one is the local electrostatic field. This opens up the possibility of accurate color tuning the bioluminescent absorption and emission by adjusting the local charged residues. With this aim, the optical response of ...

The effect of incident field refraction on the scattered field from vertically extended cylindrical targets is investigated. A theoretical model for the total scattered field from a cylindrical target in a range-dependent ocean waveguide is developed from Green's theorem. The locally scattered ...

Proper spatial and temporal treatments of climate change scenarios projected by General Circulation Models (GCMs) are critical to accurate assessment of climatic impacts on natural resources and ecosystems. For accurate prediction of soil erosion risk at a particular farm or field under climate cha...

Accurate temporal and spatial estimation of land surface temperatures (LST) is important for modeling the hydrological cycle at field to global scales because LSTs can improve estimates of soil moisture and evapotranspiration. Using remote sensing satellites, accurate LSTs could be routine, but unfo...

This paper presents a tidally averaged model that approximates the long-term mixing processes of dissolved matter in tidal waters. The averaged transport model is based on a stochastic particle model. Because formal averaging techniques are used, the asymptotic validity of the approximation can be proven under the restriction that the ...

The blinding energy of donors as described by a simple model Hamiltonian in a magnetic field of arbitrary strength is calculated using an expansion of the wave function in terms of spherical harmonics. All the matrix elements are calculated analytically and the Hamiltonian is solved accurately. We then calculate the polarizability by ...

An approach to Witten string field theory based on the discretization of the world sheet is adopted. We use it to calculate tree amplitudes with the formulation of the theory based on string functionals. The results are evaluated numerically and turn out to be very accurate, giving, for a string approximated by 600 points, values within 0.02% of the ...

Models of soil structure, used in the design of safe grounding grids for utility substations, require accurate information on the soil resistivity at the site. Small-scale tests on earth models in an electrolytic tank show that current field methods of measuring soil resistivity can provide the data needed to ...

Our research article did not criticize the design of models used to predict global change impacts on future food supply. We argued that reliable model projections require accurate model parameterization. Data from the fully open-air field treatments with elevated CO2 (FACE) indicate that the ...

Up to now the analysis of the liquid helium prewetting line on alkali metal substrates have been made using the simple model proposed by Saam et al. Some improvements on this model are considered within a mean field, sharp kink model. The temperature variations of the substrate-liquid interface energy and that of ...

We discover several magnetic Feshbach resonances in collisions of ultracold 39K atoms, by studying atom losses and molecule formation. Accurate determination of the magnetic-field resonance locations allows us to optimize a quantum collision model for potassium isotopes. We employ the model to predict the ...

New collecting and discharge electrode configurations are being used in electrostatic precipitators. In order to mathematically model precipitators with these arrangements, it is necessary to develop reliable models of the field strength distributions of these electrode-plate geometries. This paper presents the concept of an equivalent ...

Accurate electromagnetic sensing of soil water contents (') under field conditions is complicated by the dependence of permittivity on specific surface area, temperature, and apparent electrical conductivity, all which may vary across space or time. We present a physically-based mixing model to pred...

The Ecosystem Assessment Model (EAM) of the Cooling Lake Assessment Methodology was applied to the extensive ecological field data collected at Lake Norman, North Carolina by Duke Power Company to evaluate its capability to simulate lake ecosystems and the ecological effects of steam electric power plants. The EAM provided simulations over a five-year ...

Process modeling of forest growth has provided a significant adjunct to field studies by enabling us to test ecological constructs of tree growth and stand-level stresses of both natural and anthropogenic origin. Competition is a major component of these models, though there is little uniformity in the conceptual design and ...

A zero-temperature real-space renormalization-group method is presented and applied to the quantum Ising model with a transverse field in one dimension. The transition between the low-field and high-field regimes is studied. Magnetization components, spin correlation functions, and critical exponents are derived ...

We demonstrate that the restoration of chiral symmetry at finite T in a class of confining Dyson-Schwinger equation (DSE) models of QCD is a mean field transition, and that an accurate determination of the critical exponents using the chiral and thermal susceptibilities requires very small values of the current-quark mass: ...

The authors compare the results of computer simulated flow fields around building 170 (B170) at Lawrence Livermore National Laboratory (LLNL) with field measurements. This is the first stage of a larger effort to assess the ability of computational fluid dynamics (CFD) models to predict atmospheric dispersion scenarios around building ...

This paper presents a numerical and an experimental investigation on the ferroresonance in a LCR series electric circuit with the aim of deepening the effects of the magnetization phenomena in the ferromagnetic core. In the experiments an Epstein-like FeSi core, enabling an accurate material characterization under the same test conditions, constitutes the non-linear ...

... at explaining the response to hypoxia and hypercapnia ... More accurate lung injury model. ... accurate determination of lung injuries, including location ...

A model of the Earth's gravitational field was compared with ocean gravimetry data as part of the development of a satellite based system for ocean localization. Results show that model accuracy is: geoid 30 to 40 cm; gravity anomaly 10 to 15 mgals; and vertical deviation component less than 5 sec. The GEOS 3 satellite gives a good ...

This paper provides comments to a companion journal paper on predictive modeling of hydraulic fracturing patterns (N.R. Warpinski et. al., 1994). The former paper was designed to compare various modeling methods to demonstrate the most accurate methods under various geologic constraints. The comments of this paper are centered around ...

A simplified mathematical model for the far field of a monomode diode laser is employed for easy but fairly accurate computations of the optical field in the focal region. The present treatment is concerned with laser junctions significantly narrower than the wavelength. The field distribution ...

Accurate modeling of EUV Lithography is a mandatory step in driving the technology towards its foreseen insertion point for 22-16nm node patterning. The models are needed to correct EUV designs for imaging effects, and to understand and improve the CD fingerprint of the exposure tools. With a full-field EUV ADT ...

Although it is very important to conduct listening tests when constructing a practical sound field reproduction system based on wave field synthesis, listening tests are very expensive. A localization model of synthesized sound images that predicts the results of listening tests is proposed. This model reduces the ...

(ASI) for accurate measurement of the Earth gravitomagnetic field (Lense- Thirring effect). We descibe the status of this experiment that will be launched ...

The Karlsruhe Tritium Neutrino (KATRIN) experiment is a tritium beta decay experiment designed to make a direct, model independent measurement of the electron neutrino mass. To accomplish this task, the experiment employs precisely defined electric and magnetic fields for particle transport and mass spectroscopy. In order to simulate particle trajectories ...

We present the first calculation of the Bayesian evidence for different prototypical single field inflationary scenarios, including representative classes of small field and large field models. This approach allows us to compare inflationary models in a well-defined statistical way and to ...

We introduce provably unconditionally stable mixed variational methods for phase-field models. Our formulation is based on a mixed finite element method for space discretization and a new second-order accurate time integration algorithm. The fully-discrete formulation inherits the main characteristics of conserved phase dynamics, ...

Developments in permanent magnet materials such as alnicos, rare-earth cobalts and ferrites have brought in their wake new interest in their application to the design of electrical machinery, torque couplers, lifting magnets, and other electromechanical devices. In all these cases, the magnetic field provides the medium for energy conversion. The accurate ...

The importance of going beyond laboratory measurements to prediction of field performance of fenestration systems is noted. The current state of the art in energy prediction related to fenestrations is discussed; a critique of the ASHRAE U-value is presented, and current questions about film coefficients are put into context. Ambiguities in the modeling of ...

Space weather modeling, forecasts, and predictions, especially for the radiation belts in the inner magnetosphere, require detailed information about the Earth's magnetic field. Results depend on the magnetic field model and the L* (pron. L-star) values which are used to describe particle drift shells. ...

We propose an improved model for the strain dependence of the superconducting properties of Nb{sub 3}Sn. The model is based on the three dimensional strain tensor and derived in terms of the first, second and third invariants, and improves an existing model that only includes the second invariant. The axial form of the new ...

Polarization phenomena in ferroelectric materials are frequency-dependent, and the present article describes the use of a fractional derivative for the understanding of these phenomena as well as modeling them as functions of frequency and electric field amplitude. The focus was first directed toward the definition and validation of the proposed ...

The determination of the internal magnetic field of Jupiter has been the object of many studies and publications. These models have been computed from the Pioneer, Voyager, and Ulysses measurements. Some models also use the position of the Io footprints as a constraint: the magnetic field lines mapping to the ...

The Vector Electric Field Instrument (VEFI) suite onboard the C/NOFS spacecraft includes a sensitive fluxgate magnetometer to measure DC and ULF magnetic fields in the low latitude ionosphere. The instrument includes a DC vector measurement at 1 sample/sec with a range of � 45,000 nT whose primary objective is to enable a V x B measurement that is more ...

We present a derivation of the recently proposed eighth-order phase-field crystal model [A. Jaatinen , Phys. Rev. E 80, 031602 (2009)10.1103/PhysRevE.80.031602] for the crystallization of a solid from an undercooled melt. The model is used to study the planar growth of a two-dimensional hexagonal crystal, and the results are compared ...

A new analytic model is presented that 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 ...

A new analytic model is presented that 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 ...

of views (FOV). The most accurate representation of an FOV is through the geometric shape of a circular for georeferenced video search. In this study we propose a novel vector-based model for FOV estimation which pro such as the camera location, the field-of-view (FOV), the direc- tion, etc., can provide a comprehensive ...

Accurate crop development models are important tools in evaluating the effects of water deficits on crop yield or productivity. The FAO AquaCrop model, predicting crop productivity and water requirement under water-limiting conditions, was calibrated and validated for maize (Zea mays L.) using six ...

Numerical modelling of flow structures over idealized transverse aeolian dunes of varying geometry the streamwise and vertical velocity flow fields over idealized transverse dunes of varying height (h) and stoss slope basal length (L). The model accurately reproduced patterns of: flow deceleration at the dune toe

Accurate prediction of Phytophthora infestans outbreaks is crucial for effective late blight management. The SIMBLIGHT1, SIMPHYT1, and modified SIMPHYT1 models were assessed for predicting late blight outbreaks relative to the NOBLIGHT model using climatic data from field experiments at Presque Isle...

Computer model calculations and experimental comparison are presented for thermomagnetic writing in TbFe media. Two models are discussed which are appropriate for two observed types of writing behavior. A ''bubble'' type writing model is found to give good experimental agreement when wall motion ...

The accuracy of three radionuclide transfer models for predicting the interception and retention of airborne particles by agricultural crops was tested using Pu-bearing aerosols released to the atmosphere from nuclear fuel facilities on the U.S. Department of Energy's Savannah River Plant, near Aiken, SC. The models evaluated were: (1) NRC, the ...

The accuracy of three radionuclide transfer models for predicting the interception and retention of airborne particles by agricultural crops was tested using Pu-bearing aerosols released to the atmosphere from nuclear fuel facilities on the U.S. Department of Energy's Savannah River Plant, near Aiken, SC. The models evaluated were: 1) NRC, the ...

This paper is concerned with the spatial acoustic response of the human pinna modelled with the boundary element method (BEM). Accurate geometric models of five pinnae are captured by using state-of-the-art 3-D laser scanners and digitisers. These computer models are converted to valid BEM ...

The Puget Sound hydrographic model at the Pacific Science Center is a small-scale, accurate physical model of Puget Sound. Inputs, such as: ocean salinity, tides, fresh water inflow and various effluent characteristics, can be accurately controlled by the model operator. Since some parameters ...

The APLE (Average Power Laser Experiment) photoinjector accelerates electrons to 5 MeV with four cavities. A solenoid placed between the first two cavities focuses the low energy (1.2 MeV) electron beam. The beam transport and the beam quality of the injector depend on the detailed field profile of the solenoid. To describe the solenoid magnetic field ...

The APLE (Average Power Laser Experiment) photoinjector accelerates electrons to 5 MeV with four cavities. A solenoid placed between the first two cavities focuses the low energy (1.2 MeV) electron beam. The beam transport and the beam quality of the injector depend on the detailed field profile of the solenoid. To describe the solenoid magnetic field ...

Laser beam front distortions characterizing near field losses of energy from a turret mounted on a generic helicopter have been computed to support the modeling and simulation effort of a directed energy testing. The flow field has been computed using an unstructured computational fluid dynamics method with (a) Reynolds averaged ...

Partial contents: An Accurate Non-iterative Algorithm for Computing the Length of a position Vector to a Subsatellite Point; Feasibility of the Short Arc Adjustment Model in SEASAT-a Altimetry Reductions Mathematical Outline of the Short Arc Orbital Investigation, and Realistic GEOS-3 and SEASAT-A analysis; Accuracy Improvement in Adjusting Gravity ...

In this paper, we study whether the magnetic field of the T96 empirical model can be in force balance with an isotropic plasma pressure distribution. Using the field of T96, we obtain values for the pressure P by solving a Poisson-type equation {del}{sup 2}P = {del} {center_dot} (J x B) in the equatorial plane, and 1-D profiles on the ...

With the Monte Carlo methods, we systematically investigate the short-time dynamics of domain-wall motion in the two-dimensional random-field Ising model with a driving field (DRFIM). We accurately determine the depinning transition field and critical exponents. Through two different ...

With the Monte Carlo methods, we systematically investigate the short-time dynamics of domain-wall motion in the two-dimensional random-field Ising model with a driving field (DRFIM). We accurately determine the depinning transition field and critical exponents. Through two different ...

Realistic computer modelling of biological objects requires building of very accurate and realistic computer models based on geometric and material data, type, and accuracy of numerical analyses. This paper presents some of the automatic tools and algorithms that were used to build accurate and realistic 3D finite ...

Inverse parameter estimation is becoming an increasingly popular tool for calibrating and evaluating hydrologic models. In this study, PEST (Paramater ESTimation) software was used in conjunction with the one-dimensional soil transport model SHAW (Simultaneous Heat and Water Transport) to evaluate the impacts of winter climate variations on spring ...

In this paper we study the sensitivity of the flux of atmospheric muons to uncertainties in the primary cosmic ray spectrum and to the treatment of the geomagnetic field. We use the air shower simulation program AIRES to make the calculation for two different primary spectra and under several approximations to the propagation of charged particles in the geomagnetic ...

We perform an accurate polarimetry measurement of high-order harmonic emission from aligned molecules. We find that harmonic emission from N2 can be strongly elliptically polarized even when driven by linearly polarized laser fields. These data have broad implications for understanding molecules in strong fields because they cannot be ...

dichroics and beamsplitters allows four color images of a 47'x47' field of view to ... After allowing for losses due to the moon and South Atlantic Anomaly (SAA), .... luminous galaxies in the universe; map ... requirement was driven by the need to accurately distinguish different object .... model including PSF, wavefront error, ...

Field measurements and modeling development to accurately estimate biogenic VOC emissions is the objective of this nationally coordinated program. Research is conducted in-house and in local forests. Work in this field is also coordinated with leading universities and other fede...

For some purposes, such as for accurate orbit prediction, it seems to be useful to replace the large fields of harmonic coefficients in the Earth gravity field models by a limited set of the lumped geopotential coefficients, tailored to the individual orbits. The lumped values absorb the orbital information to a ...

Summary of Error Parameters for the Different Scan Techniques ............ 13 .... Error Model Derivation. To accurately propose a near-field ..... simulate the behavior of the test article to a millimeter wavelength signal. ..... Another method is using a sight level to verify tilt to gravity and any systematic ...

The theory, construction, and uses of an analog for measuring the electrical effects of hvdc on pipelines are discussed. The analog was constructed using actual field data and was checked against field conditions after its construction. The difficulty of producing accurate demonstrations of hvdc interference led to the development of a ...

The general purpose of this research was to develop sophisticated models of electron beam driven free electron lasers in order to more accurately predict radiation gain rates and fundamental efficiencies. Over the period covered by the contract a number of magnetic field and beam configurations were studied but primary emphasis has ...

The primary objective of this thesis was to determine the feasibility of modifying the Productive Unit Resourcing (PUR) model to accurate reflect contract administration functions performed at the Navy Field Contracting Activities (NFCAs). Data concerning...

Electromagnetic force is an important driving force for convection in the weld pool during arc welding. Accurate calculation of the electromagnetic force field requires complex numerical calculations of three-dimensional current density and magnetic flux fields. Several simplifying assumptions have been suggested to avoid the complex ...

A Gaussian distribution model was developed to examine the field-induced performance of anisotropic magnetorheological elastomers. The developed model was based on the assumption that the iron particles in magnetorheological elastomers aggregate into a large number of parallel body-centered tetragonal structure columns whose length ...

A realistic two-handed surgical suturing simulation would have a broad impact on the way doctors are trained in the field of surgery. Current state-of-the-art in suturing simulators do not accurately represent realistic suturing conditions, leaving many necessary components, i.e. two-handed interaction, skin undermining, skin repositioning etc., out of the ...

We present a local capacitor model that enables a simple yet quantitatively accurate description of lightning rod effect in nanoplasmonics. A notion of lambda-zone capacitance is proposed and applied to predict the strongly induced electric field by a light source near nanoscale metal edges such as metal tip or metal gap. The ...

ENEL (Italian Electricity Board) planned a set of operator guidelines for the restoration of parts of the national grid starting from selected hydro power plants and progressively reaching thermal units. In order to improve system restoration reliability, ENEL periodically executes field tests taking advantage of the maintenance outages of the thermal groups. The paper ...