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 ...
Energy Citations Database
The crystallite radius R that is ascertained by X-ray techniques is noted to exert an influence on the shift of the lowest quantized state in quantum dots (QDs). On the basis of the Stokes shift of absorption and emission, and their half-widths, an upper limit is obtained for the Huang-Rhys factor S. Pump and probe beam measurements ...
NASA Astrophysics Data System (ADS)
The behaviour of cellulase enzymes in phosphate saline buffer has been studied over a wide range of temperatures and enzyme concentrations by using viscosity measurements. To characterize the conformation change of cellulase versus temperature and chemical denaturants, such as guanidinium chloride (GdmCl) and urea, the information about the intrinsic viscosity and the ...
The additional sound absorption in aerosols due to momentum transfer between the particles and the carrier gas was investigated in a tubular test section for CsBr particles suspended in He. Continuous measurements between 1 kHz and 1 MHz, undisturbed by higher duct modes, were performed using especially arranged condenser transducers of the Sell type. The ...
... diameter reflector was machined with a 3.7-meter radius of ... nonlinear least-squares fit of the absorption data ... where ro is a characteristic radius of ...
DTIC Science & Technology
The measurement of cloud absorption from aircraft has been a controversial subject largely because broadband measurements provide little insight into the physical mechanisms underlying the absorption. To partition and quantify the various mechanisms of cloud absorption, spectrally resolved ...
measure of the proton radius of the nucleus,7 and one of these experiments indicates that the proton radius increases when neutrons are added t o the ...
NASA Website
Its equatorial radius is 6378 km, but its polar radius is 6357 km - in other words, the Earth is slightly flattened. Eratosthenes was measuring the polar radius, and ...
.6 ............................................................................................................................................................................. `Radius' of the proton channel (r) 0.5 nm charges) at the basic side of the membrane. � Dp = proton diffusion coefficient. � r = radius � � � � surface proton ...
E-print Network
The radial distribution of excited atoms in an Argon plasma, produced by a surface wave was determined. The measurements were made by recording both emission and absorption at a given wavelength as a function of the radius. Depending on the neutral gas pr...
National Technical Information Service (NTIS)
The radial distribution of excited atoms in an argon plasma produced by a surface wave was observed. The measurements were made recording emission absorption at a given wavelength as a function of the radius. Depending on the neutral gas pressure (between...
Angular distributions for the elastic scattering of /sup 84/Kr by /sup 208/Pb at 494, 510, and 718 MeV have been measured. Fresnel, parametrized phase shift, and optical model analyses show that Coulomb deflection and surface absorption effects dominate. The optical model analysis shows that the results are sensitive to the nuclear potential only in the ...
... and Conductivity of body tissues at ultrahigh frequencies, Proc. ... radiation was large compared to the radius of ... frequency range of biological interest. ...
... AIAA-2003-3259 Acoustic Absorption Measurements for ... AIAA 2003 - 3259 Acoustic Absorption Measurements for Characterization of Gas Mixing ...
The absorption model was applied to cylindrical samples aligned along the axis of a cylindrical microwave cavity. The cavity was chosen to have a radius pc ...
The aim of the study was to evaluate the accuracy of an XCT 960 Stratec peripheral quantitative computed tomography (pQCT) device in assessing bone mineral content of the radius. We scanned 27 left forearm specimens excised from cadavers and focused on cortical bone mineral content (BMCc) at the junction of the middle and distal third and on total bone mineral content (BMCtot) ...
PubMed
Localized non-inductive currents due to electron cyclotron wave absorption have been measured on the DIII-D tokamak. Clear evidence of the non-inductive currents is seen on the internal magnetic field measurements by motional Stark effect spectroscopy. The magnitude and location of the non-inductive current is evaluated by comparing ...
DOE Information Bridge
The absorption (permeation) of alcohols into porous blocks of calcium carbonate has been studied experimentally and with a computer model. The experimental measurement was of change in apparent weight of a block with time after contact with liquid. The modeling used the previously developed 'Pore-Cor' model, based on unit cells of 1000 cubic pores ...
Recent models predict that the effect of atmospheric aerosol particles on global temperature depends in part on b(abs,)or on n(2), where b(abs) is the aerosol absorption coefficient, and n(2) is the imaginary part of the aerosol refractive index for radiation in visible wavelengths. Satisfactory techniques for measuring b(abs) have yet to be developed. A ...
... UNDER PRACTICAL MEASUREMENT CONDITIONS AND ... FROM ROUNDNESS MEASURING INSTRUMENTS WITH RADIUS SUPPRESSION. ...
...device. (a) Identification. An ophthalmic contact lens radius measuring device is an AC-powered device that is a microscope and dial gauge intended to measure the radius of a contact lens. (b) Classification. Class I (general...
Code of Federal Regulations, 2011
Time resolved dynamics of high intensity laser interactions with atomic clusters have been studied with both theoretical analysis and experiment. A short-pulse Ti:sapphire laser system, which could produce 50 mJ of energy in a 50 fs pulse, was built to perform these experiments. The laser used a novel single grating stretcher and was pumped, in part, by a custom Nd:YLF laser system, including 19 ...
From third international symposium on toroidal plasma confinement; Garching, Germany (26 Mar 1973). Results on microwave absorption by plasma in Tokamak FTI at upper hybrid resonance frequency are described. The dependence of the absorption on magnetic field strength and plasma density is determined. The toroidal discharge chamber of the ...
... Part I. Theory and Measurement. ... Abstract : Conventional mechanical property measurement techniques usually ... is based on measuring the radius ...
Variations in the size distribution of CuCl particles in the glass formed at different temperatures are studied via the temperature-dependent exciton spectra (the exciton-thermal analysis). The kinetics of melting of CuCl nanocrystals is measured via changes in the strength of exciton absorption during linear heating of the sample. Then, using the known ...
The conceptual design of an open-path atmospheric monitor combines an acousto-optic tunable filter for emission spectroscopy (3-14 {mu}m) with a mid-IR (4.6-5.4 {mu}m) for absorption spectroscopy. It utilizes mostly commercially available components, covers a large area ({approximately}4 km radius), measures the distance to any ...
We measure optical absorption in color-producing enzymatic reactions for biochemical analysis with a microscale optofluidic device. Cavity-enhanced laser spectrophotometry is performed on analytes within a microfluidic channel at visible wavelengths with silicon nitride microring resonators of 100 �m radius and quality factor of ...
PubMed Central
We demonstrate on-chip laser absorption spectroscopy using silicon microring resonators integrated with PDMS microfluidic channels. A 100 microm radius microring resonator with Q > 100,000 is used to enhance the interaction length between evanescent light and a cladding liquid. We measure absorption spectra of ...
measurements are useful to determine the ionospheric absorption in the lower ... noise and to calculate ionospheric absorption it is developed a software at ...
Direct measurement of the aerosol absorption and extinction cross section for a variety of chemical and biological ... Extinction = scatter + absorption ...
Fundamental electron cyclotron resonance damping for 4 mm waves with ordinary polarization is measured for propagation along the major radius traversing the midplane of the plasma in the Princeton Large Torus (PLT). Optical depths obtained from the data are in good agreement with those predicted by the relativistic hot plasma theory. Near blackbody ...
Direct (nondifferential) brightness measurements of the quiet sun at lambda = 8.2 and 13.5 mm, corrected by the Bouguer law for absorption in the terrestrial atmosphere, confirm the presence of a 160.009 +- 0.002 min periodicity. At the two wavelengths the relative amplitudes are roughly-equal0.6 x 10/sup -3/, 1 x 10/sup -3/. Maximum radio brightness ...
... Accession Number : AD0468330. Title : MEASURED ATMOSPHERIC ABSORPTION AT RUBY OPTICAL MASER WAVELENGTHS,. ...
... Accession Number : AD0634830. Title : ABSORPTION MEASUREMENTS AT MORNING TWILIGHT,. Corporate Author : RAND ...
... Title : ABSORPTION COEFFICIENT MEASUREMENTS OF NITROUS OXIDE AND METHANE AT DF LASER WAVELENGTHS, IN: APPLIED ...
Photoelectric solar radius measurements since 1974 at Mount Wilson show no change in the solar radius, with a limit of about 0.1 arc second (1 standard deviation), over the interval. The limit is set by residual systematic effects.
An instrument was designed to yield measurements showing the effective radius, departure from a given radius, and the position of the radius with respect to the conical flanks of the Rockwell C scale indenter. The surface of the indenter tip was located b...
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 ...
An evaluation of the variation in focal plane position and spot size for a 1,650 W fast axial flow CO{sub 2} laser was performed. Multiple measurements of the focused beam were taken at stepped intervals along the beam axis to create a composite representation of the focus region. Measurements were made at several power levels from low to full power for ...
The absorptive effects in inclusive reactions are studied by generalizing the strong-absorptive Regge-pole model from quasi-twobody reactions. It is conjectured that the radius of the interaction is a decreasing function of the missing mass and the consequences of this conjecture are discussed both in the triple-Regge limit ...
Angular distributions of 42-MeV ? particles, elastically scattered from 40,42,44,48Ca, 46,48,50Ti, 52Cr, 54,56Fe, 58,60,62Ni have been measured in the forward region with an absolute accuracy of +/-0.1� in particular, the locations of the minima near 35� (c.m. system) have been determined to within +/-0.1�. The theoretical analysis has been done in three ways, using (a) ...
Absorption ar. l diffraction cross sections were measured for positive pions at 442 Mev. The target elements used were C, Al, Cu, and Cd. The absorption and diffraction cross sections were determined by fitting the experimental data (taken at six angles) to the shape given by the opticalmodel theory. The nuclear ...
Colloidal silver bromide, in aqueous suspensions containing ethanol, i-propanol or acetone, is reduced to the metal and HBr upon absorption of ionizing radiation. The reaction has been studied by measurement of electrical conductivity in suspensions of particles of mean radius, r, as characterized by specific turbidity ...
Context: The discovery of photospheric absorption lines in XMM-Newton spectra of the X-ray bursting neutron star in EXO 0748-676 by Cottam and collaborators allows us to constrain the neutron star mass-radius ratio from the measured gravitational redshift. A radius of R=9{-}12 km for a plausible mass range of ...
A fiber optic sensor for the measurement of the respiratory depth has been developed. The sensor is composed of a bent optic fiber which is connected to an elastic section of a chest belt, so that its radius of curvature changes during respiration due to the respiratory chest circumference changes (RCCC). The measurement of light ...
X-ray observations of EXO 0748-676 during thermonuclear bursts revealed a set of narrow ({Delta}{lambda}/{lambda} = 0.018) absorption lines that potentially originate from the stellar photosphere. The identification of these lines with particular atomic transitions led to the measurement of the surface gravitational redshift of the neutron star and to ...
Bi12SiO20 are widely used in optical devices, spatial-time light modulators and as holographic media depending on their properties in a wide spectral range. This work deals with the optical absorption coefficient of pure and doped Bi12SiO20 (BSO) crystals measured in the energy region 1.5 � 3.2 eV and generalise our already published and new experimental ...
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 ...
Coordinated flight legs of two aircraft above and below extended ice clouds played an important role in the Tropical Composition, Cloud and Climate Coupling Experiment (Costa Rica, 2007). The Solar Spectral Flux Radiometer measured up- and downward irradiance on the high-altitude (ER-2) and the low-altitude (DC-8) aircraft, which allowed deriving apparent ...
Energy-integrated reaction cross sections have been measured at energies ranging from 38 to 80 MeV/nucleon for various exotic neutron-rich isotopes of Al, Si, P, S, Cl, Ar, K, Ca, Sc, and Ti stopping in Si. An experimental technique is employed where Si detectors are used for both particle identification and to serve as the target material. The reduced strong ...
Photoinduced energy transfer (ET) between CdSe nanocrystals (NCs) and surface adsorbed Ru-polypyridine complexes was studied by steady-state and transient photoluminescence (PL) and absorption (TA) spectroscopies. We find that the efficiency of ET is strongly dependent on the NC size. In assemblies comprising NCs with a radius of 1.23 nm and a single ...
The fundamental properties of neutron stars provide a direct test of the equation of state of cold nuclear matter, a relationship between pressure and density that is determined by the physics of the strong interactions between the particles that constitute the star. The most straightforward method of determining these properties is by measuring the gravitational redshift of ...
... Descriptors : *ELECTRON DENSITY, *POLAR ORBIT TRAJECTORIES ... HYBRID SYSTEMS, GEODESY, RADIUS(MEASURE), PLASMASPHERE. ...
... on the membrane, for the ... SCALING FACTOR, MEMBRANES, PERTURBATIONS, THINNESS, DIFFUSION, RADIUS(MEASURE ...
Elastic scattering of the weakly bound {sup 9}Be on {sup 27}Al was measured at near barrier energies. The optical model data analysis with the real and imaginary parts of a global double-folding potential does not show strong evidence of the usual threshold anomaly. The same result was obtained by using a Woods-Saxon shape optical potential and calculating the potential ...
The optical scattering coefficient of a dilute, well-solubilized eumelanin solution has been accurately measured as a function of incident wavelength, and found to contribute <6% of the total optical attenuation between 210 and 325 nm. At longer wavelengths (325�800 nm), the scattering was less than the minimum sensitivity of our instrument. This indicates that ...
The isomer shifts for the 23.8-kev gamma-transition in Sn/sup 119/ in various chemical compounds containing tin are determined by measuring the resonance absorption of gamma quanta by nuclei in crystals. A possible qualitative interpretation of the observed shifts is discussed. It is suggested that the variation of the effective proton ...
Ion heating by externally launched ion Bernstein waves is investigated in the ACT-1 hydrogen plasma. Detailed measurements of wave absorption and of the ion temperature profiles have clearly identified various heating layers near the ion cyclotron harmonics of deuterium-like and tritium-like ions. The observed heating of 10 eV/WATT/10/sup 10/ cm/sup -3/ ...
The single crystals of pure and Potassium doped L-alanine cadmium chloride (LACC), a metallo organic nonlinear optical material is grown by a slow evaporation technique. The grown crystals were confirmed by single crystal, powder XRD analyses and atomic absorption studies. Dielectric measurements were carried out for different frequencies at different ...
wall heat-transfer rate body coordinate (see fig. 2) body nose radius maximum radius of capsule configuration (see fig. 2) ...
The pressure dependence of the radius of the negative ion in helium II is derived from measurements of trapping cross section in quantized vortex lines. (Author)
Mean energy integrated reaction cross-section measurements for various neutron-rich nuclei covering the region of closed shells N=20 and N=28 were performed, at intermediate energy (30 - 65 A.MeV), via direct method, where the Silicon detectors are used as an active target. Assuming that the energy dependence of the reaction cross-section is well described by the ...
We request a 50 ks observation of the low-mass X-ray binary 4U 1702-429 with Chandra HETG in order to measure the interstellar extinction towards the source using absorption edges in its spectrum. The measurement of the column density is critical for two reasons. First, we will employ the independent grating ...
We request a 25~ks observation of the low-mass X-ray binary 4U 1608-522 with Chandra HETG in order to measure the interstellar extinction towards the source using absorption edges in its spectrum. The measurement of the column density is critical for two reasons. First, we will employ the independent grating ...
An earlier parameterization that relates the outgoing solar flux at the top of the atmosphere to the flux absorbed at the surface is modified and extended to allow for variations in atmospheric properties that were not considered in the original parameterization. Changes to the parameterization have also been introduced as a result of better treatment of water vapor absorption ...
This work has analyzed the key variables of indentation tip radius, contact radius, delamination radius, residual stress and superlayer/film/interlayer properties on nanoindentation measurements of adhesion. The goal to connect practical works of adhesion...
... MERCURY COMPOUNDS, *ABSORPTION SPECTRA, *ABSORPTION CROSS SECTIONS, *BROMIDES, MEASUREMENT, TEMPERATURE ...
... Title : The Development of an Integrating Cavity Absorption Meter to Measure Optical Absorption of Pure Waters and Suspended Particulates. ...
measurements are useful to determine the ionospheric absorption in the lower ... Perrone L., De Franceschi G., De Santis A "Ionospheric absorption ...
... Title : Atmospheric Absorption of Sound: A Resonance Tube Apparatus for Absorption Measurements. Descriptive Note : Final rept. ...
... Q UARTERLY ENGiNEERING REPORT NO. 5 ATMOSPHERIC ABSORPTION OF ELECTROMAGNETIC ... 15 B. Absorption Cell Measurements 18 ...
Penguins, mostly live in the extremely cold Antarctic, are known to have feathers and down, which are light weight, compact and extremely efficient in preventing heat loss. Nevertheless, the mechanisms of heat transfer through the penguin feathers and down, and how the unique characteristics of penguin feathers and down make them such good thermal insulators are not fully understood. In this ...
The performance evaluation of a low-cost macro-bend fiber based temperature sensor is examined in this paper. The temperature sensor is based on a macro-bend singlemode fiber loop employed in a ratiometric power measurement scheme and has a linear characteristic with temperature at a fixed wavelength and bend radius. The sensor head consists of a single ...
Shadowgraph visualization experiments provide measurements of the threshold laser power density (Sth) for the regime transition of a laser absorption wave generated using a transversely excited atmospheric CO2 pulse laser with various pulse shapes. Results revealed a great influence of the plasma expansion in the direction lateral to the wave propagation ...
The probabilities for absorption of 23.8 kev gamma quanta by Sn/sup 119/ without recoil energy losses are measured for 14 tin-containing compounds at 77 and 300 deg K temperature. A very weak temperature dependence of this probability was observed for some of the compounds. The main regularities pertaining to the magnitude of the chemical ...
ABS>Elastic scattering of /sup 32/S ions on /sup 24/Mg, /sup 27/Al and / sup 40/Ca was measured at energies between 67 and 120 MeV. Angular distribtuions were analyzed with the optical model with Woods-Saxon potentials. Strong absorption radil are extracted with and without consideration of the nuclear interaction at the surface. The nuclear ...
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 ...
An experimental method to estimate the acoustical parameters of perforated facings used for noise control applications is proposed. These perforating facings (also called screens) can be woven or non-woven fabrics or even micro-perforated plates (MPP). Following the work by Atalla and Sgard [J. Sound Vib. 303, 195-208 (2007)], the perforated facings are modeled as porous media composed with ...
A microwave calorimeter has been designed for making 140-GHz absorption measurements on the MTX. Measurement of the intensity and spatial distribution of the FEL-generated microwave beam on the inner wall will indicate the absorption characteristics of the plasma when heated with a 140 GHz FEL pulse. The ...
... radius C single particle cross section E energy f fraction of the snowpack surface occupied by ice particles H irradiance K absorption coefficient N ...
the near-infrared reflectance indicates particle size since fractional droplet absorption is approximately propor- tional to droplet radius. ...
... 10. TEM of Carbon Particle Prpduced in Aerosol Nebulizer ... a l/e 2 radius of pump beam ... AA mass specific absorption coefficient of absorbing species ...
It is pointed out that folding models are not successful in predicting the strength of the real potential near the strong absorption radius which is required by elastic scattering data. (NL)
"Cirrus spatial heterogeneity and ice crystal shape: Effects on remote. 150 sensing of cirrus optical thickness and effective crystal radius"). ...
The Integrating Cavity Absorption Meter (ICAM) provides an instrument capable of measuring optical absorption independent of scattering effects. The measurement of optical absorption has always been complicated by scattering effects. The most common and p...
... as a function of bubble radius and liquid surface tension and show good agreement with theory. Measurements of the rate of growth of bubbles by ...
... Descriptors : (*COHERENT RADIATION, MEASUREMENT), INFRARED LASERS, GAS LASERS, CARBON DIOXIDE, INTENSITY, AUSTRALIA. ...
The four-band model, derived under the effective-mass approximation for cubic semiconductor quantum dots (QDs), is compared with experimental measurements on frequency degenerate three-photon absorption (3PA) in CdSe QDs and ZnS QDs. Qualitatively, the model provides the correct prediction on the magnitude of the 3PA cross-sections, which are in the range ...
Nanocrystalline tin oxide (SnO2) thin films grown by RF magnetron sputtering technique were characterized by UV-Visible absorption spectroscopy and Photoluminescence spectroscopy. From atomic force microscopic (AFM) and Glancing angle X-ray diffraction (GAXRD) measurements, the radius of grains was found to be approximately 6+/-2 nm. ...
A series of CO{sub 2} laser welds were made at a constant beam irradiance of 6 MW/cm{sup 2} on 304 stainless steel with travel speeds selected to produce welds with varying levels of weld penetration. Using a Seebeck envelope calorimeter, the net heat input to the part was measured for each weld. It was found that the energy transfer efficiencies varied from 0.29 to 0.86, and ...
Context. We present a new primary transit observation of the hot-jupiter HD 189733b, obtained at 3.6 ?m with the Infrared Array Camera (IRAC) onboard the Spitzer Space Telescope. Previous measurements at 3.6 microns suffered from strong systematics, and conclusions could hardly be obtained with confidence on the water detection by comparison of the 3.6 and 5.8 microns ...
... Descriptors : (*VAPOR PRESSURE, RESONANCE ABSORPTION), (*COPPER, LINE SPECTRA), ABSORPTION SPECTRA, SPECTROSCOPY ...
... REFRACTIVE INDEX, *MICROWAVE EQUIPMENT, *INFRARED OPTICAL MATERIALS, *DIELECTRIC PROPERTIES, *ABSORPTION ...
... NITROGEN DIOXIDE, PHOTODISSOCIATION, ABSORPTION SPECTRA, ULTRAVIOLET SPECTRA, ULTRAVIOLET SPECTROMETERS. ...
... researched by Joint Forces Staff College from 1985 to present. ... OF THE VELOCITY AND ABSORPTION OF ULTRASOUND IN LIQUID GALLIUM. ...
... Title : IONOSPHERIC RADIO WAVE ABSORPTION MEASUREMENTS BY THE RADIO ASTRONOMIC POLARIZATION METHOD ...
Gastrointestinal absorption of citrate was measured in stone patients with idiopathic hypocitraturia
NASA Technical Reports Server (NTRS)
Simultaneous measurements of the ETA beam radius have been made with a quartz foil and a diamagnetic loop (DML). While the measurements agreed at some settings they diverged at others. While the DML measures the rms radius of the total beam, the foil measures mainly the ...
There is a growing class of elementary particle detectors ("Large Water Cerenkov Detectors") which have a body of water (thousands of tons) as a sensitive medium. Particles are detected when they interact with the water and produce Cerenkov light, so detection efficiency relies on the transparency of the water. These detectors are active typically for many years and so biological activity is one ...
Silicon atom number density profiles have been measured using laser-induced fluorescence during the chemical vapor deposition of silicon from silane. Measurements were obtained in a rotating-disk reactor as a function of silane partial pressure and the amount of hydrogen added to the carrier gas. Absolute number densities were obtained using an atomic ...
In this paper we present an approach to retrieve stratospheric aerosol number densities in the altitude range 10-40 km from SCIAMACHY limb radiance measurements in the spectral range of the O2 A absorption band, near 760 nm. Here, the characteristic light paths differ for the measured light in the O2 A band and in the spectral ...
Contents: Theory of atomic absorption measurements; Atomic-absorption spectrophotometers; The preparation of absorbing media. General principles; Flames; Graphite cuvettes; and Some special applications of the atomic-absorption method.
ccsd-00000561(version1):25Aug2003 Proton Zemach radius from measurements of the hyperfine splitting experimental" value of the proton Zemach radius from the hyperfine splitting of hydrogen which may be compared, also known as Zemach radius of the proton. The recoil correction recoil denotes the contribution of all
In postmenopausal women with a wide range of vertebral deformities, MRI-based structural measures of topology and scale at the distal radius are shown to account for as much as 30% of vertebral deformity, independent of integral vertebral BMD.IntroductionTrabecular bone architecture has been postulated to contribute to overall bone strength independent of ...
