A study was made to determine the effect of particle size on the carrier- distillation analysis of PuO/sub 2/ and to explain how to avoid the difficulties caused by large PuO/sub 2/ particles. The relative intensity of five elements was determined for three particle sizes and it was shown ...

The model PA-720 Automatic Particle Size Analyzer is a simple, relatively high speed device designed to provide accurate size distributions in both tabular and graphic forms. This model has two dynamic ranges; 50 to 2500 microns and 200 to 1600 microns. T...

The study of power sinterability as a function of average particle size was continued this quarter. A complete summary shows that average particle size, at this point of development, cannot be used on a control basis to accurately predict sinterability in...

Mechanical properties of two phase materials, such as strength, ductility and toughness, depend on the size and distribution of the second phase. However, no methods are presently available to accurately quantify the homogeneity of the distribution of the...

A second-order accurate, direct method for the simulation of magnetized, multi-dimensional plasmas is developed. A time decentered particle push is combined with the direct method for implicit plasma simulation to include finite sized particle effects in ...

A cumulative frequency distribution fit method is presented for analyzing particle size distributions by minimizing the summation of the square of cumulative frequency errors. Compared to the frequency fit method, the cumulative frequency fit method yields a more accurate solution. Based upon this, a spreadsheet was developed for ...

The Forward Scattering Spectrometer Probe and the Optical Array Probe are analyzed in terms of their ability to make accurate determinations of water droplet size distributions. Sources of counting and sizing errors are explained. The paper describes ways...

Simultaneous measurements of particle size distributions across multiple locations can provide critical information to accurately assess human exposure to particles. These data are very useful to describe indoor-outdoor particle relationships, outdoor particle penetration ...

the PR has a stable and accurate calibration and that the PR ... Braham, R. R., 1990: Snow particle size spectra in lake effect snows. J. Appl. Meteor., 29, ...

Significant noise (random error) is common in an on-line signal when measuring the particle size distribution in a fluidized bed. The application of optimal estimation theory to obtain a filtering algorithm that can rectify such measurements is detailed. Off-line simulation studies demonstrate that the filtering algorithm yields a measure of ...

Several tasks have been completed in a program to evaluate additives to improve fine particle collection in electrostatic precipitators. Screening tests and laboratory evaluations of additives are summarized in this report. Over 20 additives were evaluated; four were found to improve flyash precipitation rates. The Insitec particle analyzer was also ...

The optical properties of motor aluminum oxide are required inputs to current plume signature prediction codes, such as SIRRM. Accurate predictions are possible only if variations in the particle emissivity due to changes in particle size, contamination, ...

A highly accurate description of the atmosphere in terms of its transmission and aerosol size distribution is needed to quantify the performance of various DOD reconnaissance and weapons targeting systems. Recent DOD measurement programs have produced inc...

The capillary force due to a wetting liquid between solid particles has been calculated for several situations using a numerical technique. Included are variations in particle size, contact angle, liquid volume, and particle separation. The capillary force obtained from these calculations is more ...

Photon correlation spectroscopy (PCS) has become a method of choice for measuring submicrometer particles. It is capable of rapid, accurate measurements of mean particle size. Since the measurements are nonperturbing, it is ideal for monitoring systems undergoing dynamic changes. Despite its widespread acceptance, ...

An accurate dose estimation under various inhalation conditions is important for assessing both the potential health effects of pollutant particles and the therapeutic efficacy of medical aerosols. We measured total deposition fraction (TDF) of monodisperse micron-sized particles...

A method of manufacturing a glass frit for use in the manufacture of uniform glass microspheres to serve as containers for laser fusion fuel to be exposed to laser energy which includes the formation of a glass gel which is then dried, pulverized, and very accurately sized to particles in a range of, for example, 125 to 149 ...

To accurately model the radiative forcing of aerosol particles, one must measure in real-time the size, shape, density, chemical composition, and mixing state of ambient particles. This is a formidable challenge because the chemical and physical properties of the aerosol particles are highly ...

... THE SIZES OF DETECTED PARTICLES WHERE THE PROBABILITY P(A) OF PARTICLE DETECTION DEPENDS ON PARTICLE SIZE A. PROPER ...

This paper describes two complementary techniques, single-particle tracking and correlation spectroscopy, for accurately sizing nanoparticles confined within picoliter-volume aqueous droplets. Single-particle tracking works well with bright particles that can be continuously illuminated and ...

An accurate method for testing the strength of nuclear fuel particles. Each particle includes an upper and lower portion, and is placed within a testing apparatus having upper and lower compression members. The upper compression member includes a depression therein which is circular and sized to receive only part ...

An accurate method for testing the strength of nuclear fuel particles is disclosed. Each particle includes an upper and lower portion, and is placed within a testing apparatus having upper and lower compression members. The upper compression member includes a depression therein which is circular and sized to ...

Techniques for sizing radiocolloids are reviewed. The small size range (1 to 100 nm) of many radiocolloids and their polydispersity limit the choice of the technique used. To compare several techniques directly, the particle size of technetium-99m sulfide colloid was studied using Nuclepore filtration, ...

Techniques for sizing radiocolloids are reviewed. The small size range (1-100 nm) of many radiocolloids and their polydispersity limit the choice of the technique used. To compare several techniques directly, the particle size of Technetium-99m sulfide colloid was studied using Nuclepore filtration, ...

Uranium particles within the respirable size range pose a significant hazard to the health and safety of workers. Significant differences in the deposition and incorporation patterns of aerosols within the respirable range can be identified and integrated into sophisticated health physics models. Data characterizing the uranium ...

Uranium particles within the respirable size range pose a significant hazard to the health and safety of workers. Significant differences in the deposition and incorporation patterns of aerosols within the respirable range can be identified and integrated into sophisticated health physics models. Data characterizing the uranium ...

Particle size may strongly influence the physical and chemical properties of a substance (e.g. its rheology, surface area, cation exchange capacity, solubility, etc.), and its measurement in rocks may yield geological information about ancient environments (sediment provenance, degree of metamorphism, degree of weathering, current directions, distance to ...

Particle size is a critical parameter for a variety of operations in the chemical process industries (CPI). For example, the flow characteristics of granular materials, the sintering behavior of metallurgical powders, and the combustion efficiency of powdered coal are influenced to a major extent by particle size. ...

... AND SIZE OF PARTICLES FLUIDIZED BY A ... THE ACOUSTICAL RESONANCE MEASUREMENT, TO VARIATIONS IN PARTICLE SIZE, PARTICLE ...

... AND THE PARTICLE SIZE IS ... THE ACOUSTICAL RESONANCE MEASUREMENT PROVIDES A ... AND SIZING OF PARTICLES FLUIDIZED BY ...

Several tasks have been completed in a program to evaluate additives to improve fine particle collection in electrostatic precipitators. Screening tests and laboratory evaluations of additives are summarized in this report. Over 20 additives were evaluated; four were found to improve flyash precipitation rates. The Insitec particle analyzer was also ...

Permeability and resonance frequency of Permalloy microparticles dispersed in an insulating host depend on particle size. Maxwell-Garnett theory is not accurate to interpret experimental results. Bruggeman theory is modified in order to take into account ...

The paper discusses a test method for measuring the fractional aerosol filtration efficiency of air cleaners. The method provides a reliable and accurate way to measure air cleaner fractional efficiencies over the particle diameter size range of 0.01 to 1...

surface of the mold to calculate the "imprints" that represent the AQP0 particles protruding from the square and octagonal imprints, described accurately the size, shape, oligomeric state, orientation, and molecular weight of the AQP0 channel inserted in the phospholipid bilayer. Rigid body docking of the atomic

There are three basic research objectives. (1) To develop an accurate personal and area radon/thoron (222Rn/220Rn) detector for accurate measurement of the exposure to low airborne concentrations of these gases during remediation at Fernald. These are to be used to determine atmospheric dispersion and exposure to radon and thoron prior to and during ...

the Particle Image Velocimetry (PIV) technique. The velocity fields were oriented in a plane normal to the ... The key to accurate predictions of rotorcraft ... obtain vortex core size and document the effects of ..... image interrogation area to those found in the delayed .... resolution while ensuring that the required number ...

The model PA-720 Automatic Particle Size Analyzer is a simple, relatively high speed device designed to provide accurate size distributions in both tabular and graphic forms. This model has two dynamic ranges; 50 to 2500 microns and 200 to 1600 microns. This is an abbreviated version of the manufacturer's ...

This paper deals with the use of the Coulter Counter to count and size particles whose number average volume is between 0.33 cubic micron and 2.5 cubic micron. It was our purpose to determine whether particles of this size could be accurately counted and ...

A description is given of an analytical solution to the scattering Mueller matrix of an ensemble of small particles that may be of different shape, size, composition, and structure. It is derived within the framework of the generalized multiparticle Mie solution (GMM). Provided that all individual T matrices of a group of particles are ...

A tree code method that incorporates a local shearing disc model and fourth-order integration algorithm is applied to the problem of planetary rings, with particular emphasis on the dynamics of Saturn's B ring. The new code, described in detail elsewhere, allows for particle self-gravity, a distribution of particle sizes, and surface ...

The infrared diffuse reflectance spectra of hydrocarbon source rocks with different particle sizes were measured. The result indicated that the absorbency of the raw spectrum decreased with the reduction of particle size, but the relationship turned to be reverse after we pretreated the original spectra by using ...

Accurate characterization of the physicochemical properties of aerosols generated for inhalation toxicology studies is essential for obtaining meaningful results. Great emphasis must also be placed on characterizing particle properties of materials as administered in inhalation studies. Thus, research is needed to identify a suite of techniques capable of ...

Accurate characterization of the physicochemical properties of aerosols generated for inhalation toxicology studies is essential for obtaining meaningful results. Great emphasis must also be placed on characterizing particle properties of materials as administered in inhalation studies. Thus, research is needed to identify a suite of techniques capable of ...

Dust management strategies in industrial environment, especially of airborne dust, require quantification and measurement of size and size distribution of the particles. Advanced specialized instruments that measure airborne particle size and size distribution apply ...

We demonstrate an optical system that can apply and accurately measure the torque exerted by the trapping beam on a rotating birefringent probe particle. This allows the viscosity and surface effects within liquid media to be measured quantitatively on a micron-size scale using a trapped rotating spherical probe ...

The ATLAS experiment is a multi-purpose particle detector that will study high-energy particle collisions produced by the Large Hadron Collider. For the reconstruction of charged particles, and their production and their decay vertices, ATLAS is equipped with a sophisticated tracking system, unprecedented in size ...

In this paper a review of the work on particle simulations of dusty plasmas using a three-dimensional Particle-Particle Particle-Mesh (P3M) code is presented. The code is applied to study the charging process of micrometre size dust grains confined in low temperature plasmas. This code gives a full-scale ...

Turbulent transport of material inclusions plays an important role in many natural and industrial situations. Being able to accurately model and predict the dynamics of dispersed particles transported by a turbulent carrier flow, remains a challenge. When the particles are neutrally buoyant and small (typically comparable in ...

... Title : Resuspension Physics of Fine Particles. ... Descriptors : *PARTICLES, VELOCITY, PARTICLE SIZE, EXPERIMENTAL DATA ...

Decontamination and restoration activities generate airborne radioactive particles of different sizes. The larger particles (> 10 {mu}m) have the potential to be more radioactive than smaller particles and may be a greater risk. Health physics procedures require sampling ambient air near the working areas to ...

(1) To develop an accurate personal 222Rn (radon) and 220Rn (thoron) monitor to measure an individual exposures during DOE remediation activities. (2) To develop a personal aerosol particle size sampler, based on the principles of a novel sampler we have developed. The sampler measures not only 222Rn decay product aerosol ...

BACKGROUND: Metal-on-metal and ceramic-on-ceramic bearings were introduced as alternatives to conventional polyethylene in hip arthroplasties to reduce wear. Characterization of wear particles has been particularly challenging due to the low amount and small size of wear particles. Current methods of analysis of such ...

... Title : Particle Size Analysis of Ammonium Sulphate and Ammonium Perchlorate Using a Malvern Particle Size Analyser. ...

We describe a method for quickly and easily measuring the size of small particles in suspensions. This method uses a self-mixing laser Doppler measurement with a laser-diode-pumped, thin-slice LiNdP4O12 laser with extremely high optical sensitivity. The average size of the particles in Brownian motion is determined ...

This work proposes an enhanced nanolevel magnetic separation model considering flow limitations using simplifying assumptions. The theoretical model builds on magnetic heteroflocculation models described in the literature and couples the magnetic and hydrodynamic forces between two spherical particles with different sizes and different magnetic properties ...

... on the Retrieval of Plume Particle Properties from the ... a measure of the mean particle size can be ... and size distribution of the particles are relatively ...

Sample particle size is one of the parameters that must be controlled to ensure the similarity of samples and standards necessary for reliable spectrochemical analysis. ln spectrochemical carrier-distillation analysis of PuO/ sub 2/, significantly greater intensities are obtained from the impurity elements when the particle ...