The stylus radius is an important specification for stylus instruments and is commonly provided by instrument manufacturers. However, it is difficult to measure the stylus radius unambiguously. Accurate profiles of the stylus tip may be obtained by profiling over an object sharper than itself, such as a razor blade. However, the stylus ...

independent and may yield accurate determinations of the proton radius provided the muonic hydrogen Lamb shift of the proton radius. At this respect polarizability e#11;ects appear as one of the main sources of uncertainty the errors of the proton radius. Here we provide this value for the ...

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...

Light scattering by aerosols plays an important role in Earth�s radiative balance, and quantification of this phenomenon is important in understanding and accounting for anthropogenic influences on Earth�s climate. Light scattering by an aerosol particle is determined by its radius and index of refraction, and for aerosol particles that are ...

We combine results from interferometry, asteroseismology and spectroscopic analyses to determine accurate fundamental parameters (mass, radius and effective temperature) of 10 bright solar-type stars covering the H-R diagram from spectral type F5 to K1. Using �direct� techniques that are only weakly model-dependent we ...

Mass profile determinations for dispersion supported galaxies from line-of-sight velocities are subject to large uncertainties associated with the unknown stellar velocity anisotropy. We demonstrate both analytically and with available kinematic data that the mass-anisotropy degeneracy is effectively eliminated at a characteristic radius that is close to ...

Bone mineral content was determined in the radius of 29 osteoporotic patients by the photon absorption method. Mineral content was within the normal range in nine of 24 osteoporotic women. Ratios representing the bone mineral content in the proximal and distal areas of the radius did not distinguish osteoporotic subjects or patients ...

X-ray bursts with photospheric radius expansions give the unique possibilities for measurements the neutron star parameters, especially for sources with known distances in globular clusters. In all previous investigations the assumption that the time of the "touch-down" corresponds to the Edddington luminosity at the neutron star surface are used. The Eddington luminosities ...

A distorted-wave Born approximation calculation of the (p,2p) angular correlation for 155-Mev protons on C/sup 12/ was performed to examine the effect of various parameters on the calculated curves. The effect of the radius of the struck proton was quite dfierent from the effects of optical-model parameters; therefore the radius can be ...

Laser light scattering curves are used to determine accurately the radii of hypermicrometer (1- to 10-micron) radius fused silica fibers, representative of those encountered in fibrous aerosols. A vertically mounted fiber is illuminated perpendicularly by the 476.2, 320.9, 568.2 and 676.4 nm vertically polarized lines of a Kr(+) ion ...

We have investigated methods of reconstructing beam profiles in the penumbral region using a set of axially symmetric chambers, differing only in the detector radius. In principal, the transfer functions, or kernels, of such chambers should be functions of radius only. Three chambers of radii 0.297, 0.556, and 0.714 cm have been used. The transfer ...

It is now recognized that the International System of Units (SI units) will be redefined in terms of fundamental constants, even if the date when this will occur is still under debate. Actually, the best estimate of fundamental constant values is given by a least-squares adjustment, carried out under the auspices of the Committee on Data for Science and Technology (CODATA) Task Group on ...

We show here how the internal structure of a neutron star can be inferred from its gravitational wave spectrum. Under the premise that the frequencies and damping rates of a few w-mode oscillations are found, we apply an inversion scheme to determine its mass, radius, and density distribution. In addition, an accurate equation of state ...

We study relationships between the neutron-rich skin of a heavy nucleus and the properties of neutron-star crusts. Relativistic effective field theories with a thicker neutron skin in 208Pb have a larger electron fraction and a lower liquid-to-solid transition density for neutron-rich matter. These properties are determined by the density dependence of the symmetry energy ...

The neutron radius of a heavy nucleus is a fundamental nuclear-structure observable that remains elusive. A seemingly unrelated problem, namely, the determination of the equation of state of cold nuclear matter, also continues to challenge our understanding of the many-body problem at both low and high densities. In regard to neutron radii, significant ...

Directional drilling is carried out by orienting and positioning a whipstock having a curved guide surface at a predetermined rotational angle with respect to the desired azimuth so as to compensate for lateral deviation of the original bore or rathole. The curved guide surface of the whipstock is given a radius of curvature in a longitudinal direction corresponding to that of ...

scattering data. Table 1. Values of the Zemach radius and the Zemach corrections for selected #12;ts to proton, the best values of the proton charge radius currently come from small corrections accurately measured, is somewhat larger. The precision of the atomic measurement of the proton charge radius can increase ...

We estimate the nuclear polarizability correction to atomic transition frequencies in various helium isotopes. This effect is non-negligible for high precision tests of quantum electrodynamics or accurate determination of the nuclear charge radius from spectroscopic measurements in helium atoms and ions; in particular it amounts to ...

that of the Earth (thus the density of Jupiter is 1.32 g-cm-3 or roughly that of the Sun). ... Accurate knowledge of the Jovian gravity field allows a determination of the ...... Elliot, J. L., Dunham, E., Mink, D. J., and Chums, J . : The Radius and ...... means "long hair.") Actually, most comets have two tails, ...

We analyzed the spatial spectrum of the diffraction intensity pattern of an ideal Bessel beam and found an implicit rule that the number of the bright rings in the spatial spectrum is equal to the topological charge of the Bessel beam. The radius of the bright and dark rings has some relation with the topological charge and can be determined ...

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, (...

We will use HST+FGS to measure the parallax of the transiting planet host star XO-3. The resulting accurate distance measurement will provide the most accurate radius determination to date for this massive extrasolar planet {XO-3b}, allowing us to critically test current giant extrasolar planet structure models. ...

We have estimated global elevations on Titan using a combination of nadir-looking altimetry and SAR monopulse measurements acquired by the Cassini spacecraft radar on multiple Titan encounters. These data correspond to a set of one-dimensional tracks spread over much of the moon's surface, but with fewer observations in the southern hemisphere than in the north. We fit the measured points with ...

Methods which can reduce random and systematic errors in the determination of absolute dimensions of main sequence stars to values appreciably less than 10 percent are considered. Topics include the importance of choosing suitable double-lined eclipsing systems, spectral lines and photometric models for precision determination of stellar dimensions, and ...

... Title : APPROXIMATE METHOD FOR DETERMINING THE HEAT EXCHANGE FROM A SMALL-RADIUS SPHERICAL PARTICLE,. ...

BULLEN1 has suggested that to reconcile known data for Venus, Earth and Mars with the hypothesis that they have the same overall composition, the outer core of the Earth may be composed of Fe2O. The principal reason seems to be the resolution of an alleged discrepancy between the modern solid radius of Venus determined by radar2, 6,053.7+/-2.2 km and the ...

Cloud droplet size distributions ---- hence the key microphysical quantities of climate importance (e.g., the total droplet concentration, liquid water content, relative dispersion, mean-volume radius, radar reflectivity, and effective radius) are determined by different physical mechanisms such as pre-cloud aerosols, cloud updraft and ...

We determine the high-frequency limiting shear viscosity, ??, in colloidal suspensions of rigid, uniformly porous spheres of radius a as a function of volume fraction ? and (inverse) porosity parameter x. Our study covers the complete fluid-state regime. The flow inside the spheres is modeled by the Debye-Bueche-Brinkman equation using the boundary ...

... Accession Number : ADP000252. Title : An Accurate Determination of the Thermal Conductivity of Argon at High Temperatures,. ...

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

The field enhancement factors of flat arrays of aligned, closed-end nanotubes have been determined by accurate computational modelling. Square and random arrays have been considered. The dependence of the enhancement factor on the radius, length and density of the nanotubes has been found for square arrays and the results have been ...

Spherically bent crystals are used as analyzers in high-resolution spectroscopy, in particular, in low count-rate applications such as exotic-atom research. The focal conditions are determined not only by the bending radius and the Bragg angle but also by the crystal cut angle between its surface and the reflecting crystal planes, along with their ...

Recent observations by the Chandra observatory suggest that some neutron stars may cool rapidly, perhaps by the direct URCA process which requires a high proton fraction. The proton fraction is determined by the nuclear symmetry energy whose density dependence may be constrained by measuring the neutron radius of a heavy nucleus, such as 208Pb. Such a ...

Planetary rings provide a remarkable laboratory for the investigation of a wide range of dynamical effects, including resonance-driven density and bending waves, satellite wakes, shepherding of narrow ringlets, and non-circular edges of gaps. Careful quantitative examination of these features requires a very accurate absolute radius scale and planetary ...

der Waals radius. Similarly for the covalent radius used to determine connectivity. The defaults-and-stick model. B. Chemical Bonds The connectivity is determined based upon inter- atomic distances and covalent. . . . . . . . . . . . . . . . . . . . . . . . . . 16 Using the Defaults. . . . . . . . . . . . . . . . . ...

An interesting variation on the familiar method of determi-ning the earth's equatorial radius a sub e, from a knowledge of the earth's equatorial gravity is suggested. The value of equatorial radius thus found is 6378,142 + or - 5 meters. The associated p...

In the international standard (International Organization for Standardization 11551) for measuring the absorptance of optical components (i.e., laser calorimetry), the absorptance is obtained by fitting the temporal behavior of laser irradiation-induced temperature rise to a homogeneous temperature model in which the infinite thermal conductivity of the sample is assumed. In this paper, an ...

A strong increase has been measured in the size and polydispersity of sodium dodecyl sulfate (SDS) micelles on increasing the detergent concentration in solutions containing high salt (NaCl) concentration. The mean hydrodynamic radius and the polydispersity of the micelles were measured. A thermodynamic theory of micelle formation and growth is presented. This theory makes use ...

The recent discovery of an eclipsing hierarchical triple system with two low-mass stars in a close orbit (KOI-126) by Carter et al. appeared to reinforce the evidence that theoretical stellar evolution models are not able to reproduce the observational mass-radius relation for low-mass stars. We present a set of stellar models for the three stars in the KOI-126 system that ...

Muonic hydrogen ({mu}H) is a unique tool to study the low-energy properties of the proton form factors. The energy levels of {mu}H are very sensitive to QED, recoil, and proton finite-size effects. We calculate the corrections to the Lamb shift and also to the fine and hyperfine structures that contribute at the 0.01-meV precision level. This result may allow for the precise ...

A precise determination of the neutron skin ?rnp of a heavy nucleus sets a basic constraint on the nuclear symmetry energy (?rnp is the difference of the neutron and proton rms radii of the nucleus). The parity radius experiment (PREX) may achieve it by electroweak parity-violating electron scattering (PVES) on Pb208. We investigate PVES in nuclear mean ...

Most nuclei have a nearly spherical shape and can be characterized by an effective radius R = R/sub 0/ A/sup 1//sup ///sup 3/, where A is the nucleon number and R/sub 0/ is a constant to be determined from experimental data. Traditionally, the data came from experiments on muonic or pionic x-ray emission, high-energy electron scattering, optical or x-ray ...

A physical model that describes the rewetting characteristics of liquid flowing over a heated plate with parallel grooves was developed. Using this physical model, an analytical expression for the rewetting velocity as a function of the fluid properties, the physical geometry, the mass flux, and the applied heat flux was derived. This expression was then compared with the experimental results ...

We report the discovery and characterisation of OGLE-TR-122b, the smallest main-sequence star to date with a direct radius determination. OGLE-TR-122b transits around its solar-type primary every 7.3-days. With M=0.092�0.009 M_? and R=0.120+0.020-0.013 R_?, it is by far the smallest known eclipsing M-dwarf. The derived mass and ...

AbstractRipley's K-, H-, and L-functions are used increasingly to identify clustering of proteins in membrane microdomains. In this approach, aggregation (or clustering) is identified if the average number of proteins within a distance r of another protein is statistically greater than that expected for a random distribution. However, it is not entirely clear how the function may be used to ...

Three different methodologies used for the extraction of laminar information are compared and discussed. Starting from an asymptotic analysis assuming a linear relation between the propagation speed and the stretch acting on the flame front, temporal radius evolutions of spherically expanding laminar flames are postprocessed to obtain laminar burning velocities and Markstein ...

We test the efficacy of using a single Lagrangian point to represent a sphere, and a one-dimensional array of such points to represent a slender body, in a new immersed boundary method for Stokes flow. A numerical parameter, the spacing of the Eulerian grid, is used to determine the effective radius of the immersed sphere or slender body. Such ...

... SHAPE, MATHEMATICAL MODELS, THREE DIMENSIONAL, INTERFERENCE, DIFFERENTIAL EQUATIONS, GEOMETRY, FLOW SEPARATION ...

The axial residual stress distribution as a function of radius was determined from the fiber surface

The distribution of pulsars in galactocentric radius and z distance has been determined for opposite

A technique has been developed which allows the radius of a bubble in a fluid to be accurately measured without disturbing the bubble. Results are presented which show that radius measurements of single air-bubbles in water can be achieved by shining a He...

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) coil/MHD model. Also included in this paper are results obtained from applying the revised code to a study for a high-field ...

We determine the impedance of a cylindrical metal tube (resistor) of radius a, length g, and conductivity {sigma}, attached at each end to perfect conductors of semi-infinite length. Our main interest is in the asymptotic behavior of the impedance at high frequency, k >> 1/a. In the equilibrium regime, , the impedance per unit length is ...

Single crystals of the title compounds with Ln = La, Ce, Pr, Nd, Sm, and Eu have been grown by the Czochralski technique, and their cell parameters and melting points were determined accurately. All compounds crystallize in the prototype C2/c symmetry, and apparently only La/sub 2/(WO/sub 4)/sub 3/ exhibits a phase transition between room ...

Recent observations of new fast ion beam driven instabilities in MHz frequency range in National Spherical Torus experiments (NSTX) are suggested to be Compressional Alfvin Eigenmodes (CAEs). A new theory of CAEs applicable to low aspect ratio toroidal plasmas is developed based on the ballooning representation for the poloidal dependence of the perturbed quantities. In agreement with ...

We examine current numerical relativity computations of gravitational waves, which typically determine the asymptotic waves at infinity by extrapolation from finite (small) radii. Using simulations of a black hole binary with accurate wave extraction at r=1000M, we show that extrapolations from the near zone are self-consistent in approximating ...

We examine current numerical relativity computations of gravitational waves, which typically determine the asymptotic waves at infinity by extrapolation from finite (small) radii. Using simulations of a black hole binary with accurate wave extraction at r=1000M, we show that extrapolations from the near zone are self-consistent in approximating ...

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 ...

The extent of a droplet's spreading over a flat, smooth solid substrate and its equilibrium height in the presence of gravity are determined approximately, without a numerical solution of the governing nonlinear differential equation, by assuming that the droplet takes on the shape of an oblate spheroidal cap and by minimizing the corresponding free energy. The comparison with ...

The spreading of oil underneath a sheet of ice is computed using an adaptive level set method for incompressible two-fluid flow. Factors such as viscosity, surface tension, and wall adhesion are taken into account in the computations. The results of the computations agree well with previous experiments and theory. In this work, we also present a very efficient and accurate ...

... The instability growth rate is calculated including a determination of the optimum value of the ratio of beam radius to conducting wall radius for ...

The free energy of formation and the critical radius for homogeneous nucleation of a spherical nucleus in supercooled liquid, at given temperature and ambient pressure, are determined, taking fully into account surface area, curvature, and pressure effect...

Classical two-dimensional turbulence theory is often used to understand large-scale atmospheric flows. However, the equations governing classical two-dimensional turbulence can only be derived from the governing equations by assuming that the horizontal scale is much smaller than the deformation radius, which is the scale on which baroclinic instability takes place. Typically, ...

The input impedance, field strengths, and directive gain of a monopole element at the center of a circular groundplane in free space are determined for arbitrary groundplane radius, element length, and element radius. Numerical results are obtained by usi...

The beam radius increase in proton linacs due to all possible types of random errors both parametric and coherent is considered. The beam radius increase is determined as the increase of transverse particle oscillations of individual particles. The initia...

A nuclear interaction radius is defined, based on the optical model phase shifts. It is used to calculate the transparency of the target nuclei in proton induced reactions. The use of this interaction radius leads to a reasonable value of the transparency...

recent value for the proton charge radius. Comparing experimental data with predictions for the hyper#12;ne splitting, the Zemach radius of the proton is deduced to be 1:045(16) fm. Employing exponential parametrizations for the electromagnetic form factors we determine the magnetic radius of the proton to be 0

The main topological feature of a superfluid is a quantum vortex with an identifiable inner and outer radius. A novel unitary quantum lattice gas algorithm is used to simulate quantum turbulence of a Bose-Einstein condensate superfluid described by the Gross-Pitaevskii equation on grids up to 5760{sup 3}. For the first time, an accurate power-law scaling ...

Microphase separation of mixed A?B polymer brushes grafted onto a nanosphere with its radius comparable to the size of polymers is investigated by numerical implementation of the self-consistent field theory. The idea is to embed the sphere within a larger cubic computational cell and use a "masking" technique to treat the spherical boundary. The partial differential equations ...

Microphase separation of mixed A/B polymer brushes grafted onto a nanosphere with its radius comparable to the size of polymers is investigated by numerical implementation of the self-consistent field theory. The idea is to embed the sphere within a larger cubic computational cell and use a ``masking'' technique to treat the spherical boundary. The partial differential ...

Viscoelastic mechanical properties of biological cells are commonly measured using atomic force microscope (AFM) dynamic indentation with spherical tips. A semiempirical analysis based on numerical simulation is built to determine the cell mechanical properties. It is shown that the existing analysis cannot reflect the accurate values of cell ...

for the growth of the proton radius R p with increasing energy. The radius R p can be determined from the slope B by the growth of the proton radius with increasing energy. We investigate this, and other e#27;ects, in the next of the proton radius, see (9). 9 For example, Ref. [37] gives the ...

Mass profile determinations for dispersion supported galaxies from line-of-sight velocities are subject to large uncertainties associated with the unknown stellar velocity anisotropy. We demonstrate both analytically and with available kinematic data (for systems spanning eight decades in luminosity) that the mass-anisotropy degeneracy is effectively eliminated at a ...

However, accurate retrievals of the aerosol optical thickness, refractive index, and effective radius using polarization measurements do not require a ...

curious observation about Earth's umbra. In order to accurately predict the duration of a lunar eclipse, he found it necessary to increase the radius of the shadow about 1% more...

... of particles needed in a computational cell as compared ... the influence of the particles into the ... Currently, a constant particle influence-radius ensures ...

... formed as a result of underground explosions in sand and clay soils are determined in the presence of residual pressure from explosion products. ...

Despite the accurate formulation of Laplace's Tidal Equations (LTE) nearly 250 years ago, analytic solutions of these equations on a spherical planet that yield explicit expressions for the dispersion relations of wave solutions have been found only for slowly rotating planets, so these solutions are of no relevance to Earth. Analytic solutions of the LTE in a symmetric ...

The knowledge of accurate distances to Planetary Nebulae (PNe) is necesary in order to improve the determination of some physical quantities such as the nebular radius and mass. The nebular mass is a critical parameter to determine the amount of mass that is returned to the interstellar medium by the PN. This mass ...

The aim of this work was to study the diffraction effects in the ultrasonic field of piston source transducers and their importance for accurate measurements of attenuation and dispersion in viscoelastic materials. In laboratory measurements, the diffraction phenomena are mainly due to the beam spread of the ultrasonic wave propagating in viscoelastic materials. This effect is ...

In interacting binaries, comparison of a donor star's radial response to mass loss (ML) with the response of its Roche radius determines whether ML persists and, if so, determines the timescale and stability of the ensuing evolutionary phase. For giants with deep convective envelopes, the canonical description holds that once mass ...

The many radio occultation profiles of Saturn's rings obtained during the Cassini mission allow one to analyze accurately any nonlinear (or linear) density wave from multiple optical depth profiles. There are several motivations to analyze density waves. The first one is to verify the theoretical model and its assumptions for nonlinear density waves. This is achieved by ...

Super-Earths are the newest class of extra-solar planets with a mass range between about 1-10 M ? . With their large masses, they experience very large internal pressures. The central pressure scales proportionately with mass, reaching values that require us to extend our understanding of rock and H2O behavior to such extreme conditions. Pressure also constrains the power law relationship between ...

A method is developed to determine the Hydraulic conductivity and porosity of the formation surrounding a well as a function of depth. n electrically anomalous fluid is injected into a fully screened well and the radius of invasion is determined by induction logging. he radius of...

... Accession Number : AD0722605. Title : The Determination of the Accurate Positions of Radio Stars by the Lunar Occultation Technique. ...

... Title : Alanine Dosimetry Accurately Determines Radiation Dose in Nonhuman Primates. Descriptive Note : Special publication. ...

... Accession Number : ADA202907. Title : Accurate Determination of the Complex Permittivity of Biological Tissue Around 35 GHz. ...

A two-stage computational procedure is presented for the accurate determination of transverse normal

... Accession Number : ADD317635. Title : ACCURATE DEPTH DETERMINATION IN WELL LOGGING. Corporate Author : ...

GU Boo is one of only a relatively small number of well-studied double-lined eclipsing binaries that contain low-mass stars. L�pez-Morales & Ribas present a comprehensive analysis of multi-color light and radial velocity curves for this system. The GU Boo light curves presented by L�pez-Morales & Ribas had substantial asymmetries, which were attributed to large spots. In spite of the ...

GU Boo is one of only a relatively small number of well-studied double-lined eclipsing binaries that contain low-mass stars. Lopez-Morales and Ribas present a comprehensive analysis of multi-color light and radial velocity curves for this system. The GU Boo light curves presented by Lopez-Morales and Ribas had substantial asymmetries, which were attributed to large spots. In spite of the ...

Variations of the solar radius are not only important for solar physics but they also play a fundamental role in the research of terrestrial climate. In fact, changes in the apparent size of the Sun could account for a significant fraction of the total irradiance variations, and solar irradiance is known to be a primary force in driving atmospheric circulation. While the MDI ...

We propose a wire spark chamber experiment to measure the pion electromagnetic radius accurate to {+-}0.03f by measuring the scattering cross section for 50-80 GeV pions from electrons in a liquid hydrogen target. The data will distinguish between the {rho} dominance prediction of 0.64f and the ''proton-like'' ...

We describe the dimensional characterization of copper quasisphere NPL-Cranfield 2. The quasisphere is assembled from two hemispheres such that the internal shape is a triaxial ellipsoid, the major axes of which have nominal radii 62.000 mm, 62.031 mm and 62.062 mm. The artefact has been manufactured using diamond-turning technology and shows a deviation from design form of less than �1 �m ...

We combine results from interferometry, asteroseismology and spectroscopy to determine accurate fundamental parameters of 23 bright solar-type stars, from spectral type F5 to K2 and luminosity classes III-V. For some stars we can use direct techniques to determine the mass, radius, luminosity and effective ...

Motion of the wrist bones is complicated and difficult to measure. Noninvasive measurement of carpal kinematics using medical images has become popular This technique is difficult and most investigators employ custom software. The objective of this paper is to describe a validated methodology for measuring carpal kinematics from computed tomography (CT) scans using commercial software. Four ...

The concept of using low gravity experimental data together with CFD simulations for measur-ing the viscosity of highly viscous liquids was recently validated on onboard the International Space Station (ISS). A series of microgravity tests were conducted for this purpose on the ISS in July, 2004 and in May of 2005. In these experiments two liquid drops were brought manually together until they ...

By combining the constraints of charge symmetry with new chiral extrapolation techniques and recent low mass lattice QCD simulations of the individual quark contributions to the electric charge radii of the baryon octet we obtain an accurate determination of the strange electric charge radius of the proton. While this analysis provides ...

By combining the constraints of charge symmetry with new chiral extrapolation techniques and recent low-mass quenched lattice QCD simulations of the individual quark contributions to the electric charge radii of the baryon octet, we obtain an accurate determination of the strange electric charge radius of the proton. While this ...

Highly resolved CCD images of Pluto and Charon near maximum separation are measured with point spread function fitting techniques to determine independent magnitudes and an accurate separation for Pluto and Charon. A measured separation of 0.923 + or - 0.005 arcsec at a position angle of 173.3 + or - 0.3 deg on June 18, 1987 UT produced a value of 19558.0 ...

A pendulum device has been developed to measure contact force, displacement and displacement rate of an impactor during its impact on the sample. Displacement, classically measured by double integration of an accelerometer, was determined in an alternative way using a more accurate incremental optical encoder. The parameters of the Kuwabara-Kono contact ...

This work expands recent investigations in the field of spin-polarized tritium (T downward arrow) clusters. We report the results for the ground-state energy and structural properties of large T downward arrow clusters consisting of up to 320 atoms. All calculations have been performed with variational and diffusion Monte Carlo methods, using an accurate ab initio interatomic ...

The proton is the primary building block of the visible Universe, but many of its properties-such as its charge radius and its anomalous magnetic moment-are not well understood. The root-mean-square charge radius, r(p), has been determined with an accuracy of 2 per cent (at best) by electron-proton scattering experiments. The present ...

ObjectiveTo develop an algorithm to measure the dimensions of an airway oriented obliquely on a volumetric CT, as well as assess the effect of the imaging parameters on the correct measurement of the airway dimension.Materials and MethodsAn airway phantom with 11 poly-acryl tubes of various lumen diameters and wall thicknesses was scanned using a 16-MDCT (multidetector CT) at various tilt angles ...

Recent studies indicate that small but persistent variations in the total solar irradiance may play an important role in climate changes. If it is known that such changes are mainly due to changes in sunspots darkness and faculae brightness, it begins to be understood that changes in the radius of the Sun may also play a role. In a first part of this paper, we will show how ...

The mechanical competence of trabecular bone is significantly determined, next to material density, by its three-dimensional (3D) structure. Recent advances in micromagnetic resonance imaging (micro-MRI) acquisition and processing techniques allow the 3D trabecular structure to be analyzed in vivo at peripheral sites such as the distal radius and tibia. ...

Context: The CoRoT satellite has provided high-quality light curves of several solar-like stars. Analysis of these light curves provides oscillation frequencies that make it possible to probe the interior of the stars. However, additional constraints on the fundamental parameters of the stars are important for the theoretical modelling to be successful. Aims: We estimate the fundamental ...

The smallest particle radius detectable in a Pollak counter was estimated experimentally by using a heated-platinum-wire aerosol generator of variable size, a Pollak counter with a standard volume expansion ratio, and an ion mobility analyzer. The values obtained for the smallest detectable particle radius ranged from 1.3 to 1.4 nm in aerodynamical ...

. Operationally, we fix the number of grafted chains g and vary the NP radius to determine the radius whichArea per Ligand as a Function of Nanoparticle Radius: A Theoretical and Computer Simulation crystallization or to prevent agglomeration. This control is typically acheived by using covalently bound

... The value of da is determined as - 35.1 m and, by computation from Milan Bursa's formulas for determination of 'a' for Europe, the value of da is ...

An experimental study has been performed with a scramjet combustor and nozzle model to determine the

section, we determined the distribution radius of the EDTA-Mn2+ paramagnetic group covalently attached, dynamics, and function. Here we describe a formalism to directly determine the distribution radius Distributions. As described above, the distribution radius RP can be ...

Context. To determine the physical parameters of a transiting planet and its host star from photometric and spectroscopic analysis, it is essential to independently measure the stellar mass. This is often achieved by the use of evolutionary tracks and isochrones, but the mass result is only as reliable as the models used. Aims: The recent paper by Torres et al. (2010, ...

... accurate determination of Earth satellite orbits by the ... A method for determination of the state ... systems employed in satellite orbit determination and a ...

We report the discovery of a massive planet (Mpsini=13.02+/-0.64 MJ; total mass = 13.25+/-0.64 MJ), large (1.95+/-0.16 RJ) planet in a transiting, eccentric orbit (e=0.260+/-0.017) around a 10th magnitude F5 V star in the constellation Camelopardalis. We designate the planet XO-3b and the star XO-3, also known as GSC 03727-01064. The orbital period of XO-3b is 3.1915426+/-0.00014 days. XO-3 lacks ...

Transit observations in the infrared allow the atmospheric content of exoplanets to be determined. Here we present new primary transit observations of the hot-jupiter HD189733b, obtained in the near and mid-IR with Hubble and Spitzer Space Telescopes. The high-S/N photometric transit light curves allow us to improve the precision of the near infrared planet ...

Recently, precision laser spectroscopy on {sup 6}He atoms determined accurately the isotope shift between {sup 4}He and {sup 6}He and, consequently, the charge radius of {sup 6}He. A similar experiment for {sup 8}He is under way. We have performed large-scale ab initio calculations for {sup 4,6,8}He isotopes using high-precision ...

Recently, precision laser spectroscopy on 6He atoms determined accurately the isotope shift between 4He and 6He and, consequently, the charge radius of 6He. A similar experiment for 8He is under way. We have performed large-scale ab initio calculations for 4,6,8He isotopes using high-precision nucleon-nucleon (NN) interactions within ...

Recently, precision laser spectroscopy on {sup 6}He atoms determined accurately the isotope shift between {sup 4}He and {sup 6}He and, consequently, the charge radius of {sup 6}He. A similar experiment for {sup 8}He is under way. We have performed large-scale ab initio calculations for {sup 4,6,8}He isotopes using high-precision ...

The influence of notch included angle and root radius on the apparent dynamic fracture toughness of an unaged metastable beta titanium alloy, Ti--3Al-- 8V--6Cr--4Zr--4Mo, has been examined. The apparent fracture toughness, K/sub Id/ (rho), increases with both notch radius, rho and included angle, $omega$. These results have been compared with the ...

A precise determination of the neutron skin ?r(np) of a heavy nucleus sets a basic constraint on the nuclear symmetry energy (?r(np) is the difference of the neutron and proton rms radii of the nucleus). The parity radius experiment (PREX) may achieve it by electroweak parity-violating electron scattering (PVES) on (208)Pb. We investigate PVES in nuclear ...

Heavy-ion experiments provide important data to test astrophysical models. The high-density equation of state can be probed in HI collisions and applied to the hot protoneutron star formed in core collapse supernovae. The parity radius experiment (PREX) aims to accurately measure the neutron radius of 208Pb with parity-violating ...

We discuss the weak coupling expansion of a one-plaquette SU(2) lattice gauge theory. We show that the conventional perturbative series for the partition function has a zero radius of convergence and is asymptotic. The average plaquette is discontinuous at g{sup 2}=0. However, the fact that SU(2) is compact provides a perturbative sum that converges toward the correct answer ...

High-resolution peripheral quantitative computed tomography (HR-pQCT) is clinically available today and provides a non-invasive measure of 3D bone geometry and micro-architecture with unprecedented detail. In combination with microarchitectural finite element (?FE) models it can be used to determine bone strength using a strain-based failure criterion. Yet, images from only a ...

This research explores the effects of voids (pores on the particle surface that are deeper than their surface radius) on burning area at diffusion-limited combustion conditions. Scanning electron microscopy and digital processing of images of quenched particles were used to quantify surface void area, perimeter, and reacting void wall area for voids with diameters larger than ...

In scanning probe techniques, accurate height measurements on heterogeneous surfaces are a major requirement. Different electrostatic potentials of various materials have a significant influence on the measured force/current and therefore a direct influence on the tip-sample distance. Kelvin probe force microscopy (KPFM) is based on a dynamic compensation of the electrostatic ...

The International Terrestrial Reference Frame (ITRF) is a fundamental datum for high-precision orbit tracking, navigation, and global change monitoring. Accurately realizing and maintaining ITRF origin at the mean Earth system center of mass (CM) is critical to surface and spacecraft based geodetic measurements including those of sea level rise and its sources. Although ITRF ...

Proper-motion studies of several open and globular clusters have yielded accurate, two-component (radial and tangential) velocity dispersion profiles for the brighest stars in these systems. It is shown that velocity dispersions derived from proper motions, unlike those derived from radial velocities, contain enough information to determine the shape and ...

Momentum balance constraints require that the radial particle flux in the plasma edge satisfies a pinch-diffusion relation, which leads upon substitution into the continuity equation to generalized diffusion equations which also contain temperature gradients, a pinch velocity determined primarily by the electromagnetic forces, and a generalization of the diffusion coefficient. ...

A systematic macroscopic, leptodermous approach to nuclear statics and dynamics is described, based formally on the assumptions {h_bar} {yields} 0 and b/R << 1, where b is the surface diffuseness and R the nuclear radius. The resulting static model of shell-corrected nuclear binding energies and deformabilities is accurate to better than 1 part in a ...

Finite difference computer simulation programs are capable of very accurate solutions to problems in plasticity with large deformations and rotation. This opens the possibility of developing models of ductile fracture by correlating experiments with equivalent computer simulations. Selected experiments were done to emphasize different aspects of the model. A difficult problem ...

The CoRoT space mission routinely provides high-precision photometric measurements of thousands of stars that have been continuously observed for months. The discovery and characterization of the first very massive transiting planetary companion with a short orbital period is reported. A series of 34 transits was detected in the CoRoT light curve of an F3V star, observed from May to October 2007 ...

We present photometry of six transits of the exoplanet XO-2b. By combining the light-curve analysis with theoretical isochrones to determine the stellar properties, we find the planetary radius to be 0.996{sup +0.031} {sub -0.018} R {sub Jup} and the planetary mass to be 0.565 {+-} 0.054 M {sub Jup}. These results are consistent with those reported ...

We present a new statistical model of unfolded proteins in which the stiffness of polypeptide backbone is taken into account. We construct and solve a mean field equation which has the form of a diffusion equation and derive the distribution function for conformations of unfolded polypeptides. Accounting for the stiffness of the protein backbone results in a more accurate ...

The development, calibration, and laboratory and field testing of an instrument for in-place determination of sedi ment density are described. The device, encased in a submersible probe and utilizing 3 millicuries of Ra as a source of radioactivity and 3 halogen-filled Geiger-Mueller counters to detect reflected gamma rays. transmits a preamplified signal through a ...

Studies of the diffuse x-ray-emitting gas in galaxy clusters have provided powerful constraints on cosmological parameters and insights into plasma astrophysics. However, measurements of the faint cluster outskirts have become possible only recently. Using data from the Suzaku x-ray telescope, we determined an accurate, spatially resolved census of the ...

Studies of the diffuse x-ray-emitting gas in galaxy clusters have provided powerful constraints on cosmological parameters and insights into plasma astrophysics. However, measurements of the faint cluster outskirts have become possible only recently. Using data from the Suzaku x-ray telescope, we determined an accurate, spatially resolved census of the ...