Now showing items 151-160 of 177
Temperature and concentration dependence of diffusion coefficient in dilute solutions
(Elsevier, 1981-09)
Temperature and molecular weight dependence of kD in D(C) = D(O) [1 + CkD], where D(C) is the diffusion coefficient for the density fluctuations in a dilute polymer solution, is investigated by first expressing D(C) as a ...
A microscopic theory of density fluctuations in partially ionized gases (e.m. wave scattering)
(IOP Publishing Ltd, 1973-07-01)
This investigation develops a set of exact kinetic equations describing density fluctuations in many body systems with S species. These equations are then applied to the analysis of a partially ionized gas with three ...
Lattice vibrations of BeO
(Elsevier, 1967-02)
Parts of the dispersion relations for BeO have been measured. These relations are for waves moving in the [100] direction with their polarization vectors in the (0001) plane. The initial slopes of the measured acoustical ...
Grain-size dependence of plastic deformation in nanocrystalline Fe
(The American Institute of Physics, 2003-06-01)
Plastic deformation of nanocrystalline Fe was investigated by nanoindentation. Samples, synthesized by mechanical attrition, consisted of powder particles with diameters greater than 30 μm. The average grain diameters ...
Optimal laser heating of plasmas with constant density
(Kluwer Academic Publishers-Plenum Publishers; Plenum Publishing Corporation ; Springer Science+Business Media, 1987-01)
The laser heating of a plasma with constant density is analyzed using optimal control theory. Heating strategies that minimize the total energy spent, the heating time, or a linear combination of the two, for several values ...
Interference between resonances in a slab lattice
(Elsevier, 1968-03)
In calculating resonance absorption for one resonance, the effect of neighbouring resonances is usually neglected. It is, therefore, customary to assume that the slowing-down flux takes its asymptotic value above the ...
150-250 MeV electron beams in radiation therapy
(IOP Publishing Ltd, 2000-07-01)
High-energy electron beams in the range 150-250 MeV are studied to evaluate the feasibility for radiotherapy. Monte Carlo simulation results from the PENELOPE code are presented and used to determine lateral spread and ...
Thermodynamic and magnetic properties of metastable FexCu100−x solid solutions formed by mechanical alloying
(The American Institute of Physics, 1993-07-15)
Metastable solid solutions of Fe and Cu, which are immiscible in equilibrium, have been formed using high-energy ball milling of elemental powder mixtures. Single-phase face-centered-cubic (fcc) solid solution was obtained ...
Grain growth and phase morphology in ion beam mixed, two phase Ni---Al and Ni---Cr---Al alloys
(Elsevier, 1989-03-02)
Multilayers of Ni---21Al and Ni---20Cr---10Al were subjected to ion beam mixing using 350 keV Ni+ ions and/or thermal annealing at 440[deg]C to study the development of grain growth and phase morphology. Two film thicknesses ...
Intensity Fluctuations of the Radiation from a Dispersive Blackbody
(The American Institute of Physics, 1967-12)
Statistical properties of the output fluctuations of a photon detector measuring the intensity of radiation at a given frequency emitted by a dispersive blackbody are investigated using Langevin's technique. The variance‐to‐mean ...