83,382 research outputs found
Stress intensity at a crack between bonded dissimilar materials
The contour integral method is extended to general boundary value problems involving imperfect bonding of dissimilar materials. The loading and restraints are shown to have a significant effect on the stress intensity. Example problems are presented to illustrate the results
Factor income taxation and growth with increasing integration of world capital markets
In a closed economy, the infinite-horizon and the overlapping generations (OG) model prescribe diametrically opposite policies on factor taxation: the former argues that the growth-maximizing capital income tax rate should be set to zero, whereas the latter argues that it should be set as high as possible. This note investigates the issue by taking into account global capital market integration. We show that the long-run growth-maximizing capital income tax rate in a small open OG economy is decreasing as the economy's capital market is increasingly integrated with the rest of the world, and will be equal to zero as prescribed in the infinite-horizon model once the degree of integration becomes sufficiently high.Capital mobility, Endogenous growth, Factor income taxation, Overlapping generations, Small open economy
Identification of stromal cells in spleen which support myelopoiesis
Stromal cells in spleen organize tissue into red pulp, white pulp and marginal zone, and also interact with hematopoietic cells to regulate immune responses. This study has used phenotypic information of a previously described spleen stromal cell line called 5G3, which supports restricted hematopoiesis in vitro, to identify an equivalent stromal cell subset in vivo and to test its capacity to support hematopoiesis. Using stromal cell fractionation, phenotypic analysis, as well as cell growth and hematopoietic support assays, the Sca-1+gp38+Thy1.2+CD29+CD51+ fraction of spleen stroma has been identified as an equivalent stromal subset resembling the 5G3 cell counterpart. While heterogeneity may still exist within that subset, it has been shown to have superior hematopoietic support capacity compared with the 5G3 cell line, and all other spleen stromal cell fractions tested.This work was supported by project grants to HO from the Australian Research Council (#DP130101703) and the National Health and Medical Research Council of Australia (#585443). HL was supported by an Australian National University Postgraduate Scholarship
Neutron Stars with Bose-Einstein Condensation of Antikaons as MIT Bags
We investigate the properties of an antikaon in medium, regarding itas a MIT
bag. We first construct the MIT bag model for a kaon with and
in order to describe the interaction of-quarks in hyperonic matter in the
framework of the modifiedquark-meson coupling model. The coupling constant
in the density-dependent bag constant is treated
as afree parameter to reproduce the optical potential of a kaon in asymmetric
matter and all other couplings are determined by usingSU(6) symmetry and the
quark counting rule. With various values ofthe kaon potential, we calculate the
effective mass of a kaon inmedium to compare it with that of a point-like kaon.
We thencalculate the population of octet baryons, leptons and and
theequation of state for neutron star matter. The results show thatkaon
condensation in hyperonic matter is sensitive to the -quarkinteraction and
also to the way of treating the kaon. The mass andthe radius of a neutron star
are obtained by solving theTolmann-Oppenheimer-Volkoff equation.Comment: 14 figure
One-dimensional kinetic description of nonlinear traveling-pulse (soliton) and traveling-wave disturbances in long coasting charged particle beams
This paper makes use of a one-dimensional kinetic model to investigate the
nonlinear longitudinal dynamics of a long coasting beam propagating through a
perfectly conducting circular pipe with radius . The average axial
electric field is expressed as , where and
are constant geometric factors, is the line density of beam particles, and
satisfies the 1D Vlasov equation. Detailed nonlinear
properties of traveling-wave and traveling-pulse (solitons) solutions with
time-stationary waveform are examined for a wide range of system parameters
extending from moderate-amplitudes to large-amplitude modulations of the beam
charge density. Two classes of solutions for the beam distribution function are
considered, corresponding to: (a) the nonlinear waterbag distribution, where
in a bounded region of -space; and (b) nonlinear
Bernstein-Green-Kruskal (BGK)-like solutions, allowing for both trapped and
untrapped particle distributions to interact with the self-generated electric
field .
.Comment: 42 pages, 17 figure
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