14,166 research outputs found
Influence of Arsenic Pressure on the Doping of Gallium Arsenide with Germanium
THE doping of III-V compounds with elements from the
IVth column of the periodic table has been studied under
standard conditions of preparation by several investigators. In most cases, the IV element was found to act as an n-type dopant of low doping efficiency, a result that is usually interpreted to mean that more of the impurity atoms are located on the III element sublattice than on the V element sublattice. Causes for the unequal distribution of impurity atoms between the two sublattices
have been sought in the sizes of the atoms and in their
binding energies. An additional influence on the impurity atom distribution, namely, the vapor pressure of the V element, is considered in this note. A simple estimate will be given of the magnitude expected for the pressure effect, followed by some qualitative results for Ge-doped GaAs
Heavy-light meson in anisotropic lattice QCD
We examine whether the improved quark action on anisotropic lattices
can be used as a framework for the heavy quark, which enables precision
computation of matrix elements of heavy-light mesons. To this end, it is
crucial to verify that a mass independent and nonperturbative tuning of the
parameters is possible. As a first step, we observe the dispersion relation of
heavy-light mesons on a quenched lattice using the action which is
nonperturbatively tuned only for the leading terms. On a lattice with the
spatial cutoff 1.6 GeV and the anisotropy , the
relativity relation holds within 2% accuracy in the quark mass region with the bare anisotropy parameter tuned for the massless quark.
We also apply the action to a calculation of heavy-light decay constants in the
charm quark mass region.Comment: Lattice2002(heavyquark), 3 pages, 2 figure
Study of Scalar Mesons and Related Radiative Decays
After a brief review of the puzzling light scalar meson sector of QCD, a
brief summary will be given of a paper concerning radiative decays involving
the light scalars. There, a simple vector meson dominance model is constructed
in an initial attempt to relate a large number of the radiative decays
involving a putative scalar nonet to each other. As an application it is
illustrated why mixing is not expected to greatly alter the
production ratio for radiative decays.Comment: 9 pages, 3 figures, Talk presented at SUNYIT (Utica/NY) conference on
High Energy Physics, June 6, 200
Development of space stable thermal control coatings for use on large space vehicles
The development of a large scale manufacturing method for the production of a stable zinc orthotitanate pigment by means of an oxalate co-precipitation method is examined. Pigments were prepared at various temperatures, and major emphasis was placed on the determination of the important parameters of post-precipitation firing and treatment. A large-scale process for the modification of a glass resin binder was developed and paints were formulated using the binder
The Synthesis, Resolution and Configuration of Beta-hydroxyvaline
Synthesis, resolution, and configuration of alpha-hydroxyvalin
RPA for Light-Front Hamiltonian Field Theory
A self-consistent random phase approximation (RPA) is proposed as an
effective Hamiltonian method in Light-Front Field Theory (LFFT). We apply the
general idea to the light-front massive Schwinger model to obtain a new bound
state equation and solve it numerically.Comment: A major revision in presentation, while the results essentially
unchanged. 2 figs. replaced, 1 fig. added, some parts of Sec. V moved to Sec.
IV, some wording changed, typos correcte
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