Now showing items 31-40 of 168
Nuclear spin relaxation in paramagnetic solutions. Effects of large zero‐field splitting in the electron spin Hamiltonian
(The American Institute of Physics, 1990-11-15)
Expressions are derived describing nuclear spin relaxation in paramagnetic salt solutions under conditions where the electron spin Hamiltonian is dominated by a uniaxial quadratic zero‐field splitting (zfs) interaction. ...
Optimization of neutron activation analyses of 129I in low-level radioactive waste samples
(Elsevier, 1990)
Determination of 129I in low-level radioactive waste (LLW) samples from reactors can be a tedious and time consuming procedure often leading to results with large margins of error. This study used an efficient (approx. 2-3 ...
Determination of chloride ion diffusion coefficients for zinc dissolution in a low temperature molten salt
(Elsevier, 1990-01)
The transport properties and stoichiometry of the zinc dissolution process in mixtures of aluminum chloride and 1-methyl-3-ethylimidazolium chloride were studied. A new mass transfer correlation for rotating cylinder ...
Low-temperature properties of two interacting magnetic impurities
(Elsevier, 1990-04)
We discuss a simple model consisting of four spins ; S1 and S2 representing the impurity spins and s1 and s2 the conduction electron spin-densities at the impurity sites, coupled by three antiferromagnetic coupling: TK ...
Temperature / soot volume fraction correlations in the fuel-rich region of buoyant turbulent diffusion flames
(Elsevier, 1990-08)
Instantaneous soot volume fractions and temperatures were measured in the fuel-rich (underfire) region of turbulent nonpremixed acetylene, propylene, ethylene, and propane flames burning in still air. Large-scale, highly ...
Effect of alloying on ion-bombardment-induced surface topography on face-centred cubic metals
(Elsevier, 1990-03-02)
Previous studies of sputter-induced topographical development have shown that it is possible to form pyramids on single-crystal fcc metals oriented in the crystallographic direction. These pyramids form when the surface ...
Plasma evolution from laser‐driven gold disks. I. Experiments and results
(The American Institute of Physics, 1990-10)
Gold disk targets were irradiated with green (λ=0.53 μm) laser light at intensities between 0.5 and 5×1014 W/cm2 using shaped laser pulses. Plasma conditions near and below critical density (nc≂4×1021/cm3) were determined ...
Linear stability analysis of multilayer plane Poiseuille flow
(The American Institute of Physics, 1990-04)
A linear stability analysis of n‐layer plane Poiseuille flow is performed. Asymptotic solutions are constructed at very small and very large wavenumbers. A numerical analysis is carried out by means of a compound matrix ...
Routine production of 2-deoxy-2-[18F]fluoro--glucose by direct nucleophilic exchange on a quaternary 4-aminopyridinium resin
(Elsevier, 1990)
Resin-supported [18F]fluoride ion has been prepared and applied to a rapid, convenient synthesis of [18F]FDG. "No-carrier-added" [18F]fluoride ion is collected on a quaternary 4-(N, N-dialkylamino)-pyridinium functionalized ...
Estimation of locations of bioelectric sources using an equivalent filter
(IOP Publishing Ltd, 1990-08-01)
The authors estimate the number and locations of bioelectric sources in a horizontally layered volume conductor. By modelling the extracellular medium as an equivalent filter, the location estimation problem becomes one ...