18,007 research outputs found
NASTRAN used in a production environment
A finite element analysis procedure built around the NASTRAN system is assessed. A number of support programs that were either written or modified to interface with NASTRAN and some improvements that were made to NASTRAN itself are noted. Some typical models are analyzed and an actual schedule is followed for constructing and analyzing the models to support a large design program
Microscopic calculations of isospin mixing in N~Z nuclei and isospin-symmetry-breaking corrections to the superallowed beta-decay
Recently, we have applied for the first time the angular momentum and isospin
projected nuclear density functional theory to calculate the isospin-symmetry
breaking (ISB) corrections to the superallowed beta-decay. With the calculated
set of the ISB corrections we found |V_{ud}|=0.97447(23) for the leading
element of the Cabibbo-Kobayashi-Maskawa matrix. This is in nice agreement with
both the recent result of Towner and Hardy [Phys. Rev. {\bf C77}, 025501
(2008)] and the central value deduced from the neutron decay. In this work we
extend our calculations of the ISB corrections covering all superallowed
transitions A,I^\pi=0^+,T=1,T_z \rightarrow A,I^\pi=0^+,T=1,T_z+1 with T_z
=-1,0 and A ranging from 10 to 74.Comment: Invited talk presented by WS at the Nordic Conference on Nuclear
Physics, June 13-17, 2011, Stockholm, Sweden; Accepted for publication in
Physica Scripta, Figure 1 has been correcte
Crystallization of the regulatory and effector domains of the key sporulation response regulator Spo0A
The key response-regulator gene of sporulation, spo0A, has been cloned from Bacillus stearothermophilus and the encoded protein purified. The DNA-binding and phospho-acceptor domains of Spo0A have been prepared by tryptic digestion of the intact protein and subsequently crystallized in forms suitable for X-ray crystallographic studies. The DNA-binding domain has been crystallized in two forms, one of which diffracts X-rays to beyond 2.5 Angstrom spacing. The crystals of the phospho-acceptor domain diffract X-rays beyond 2.0 Angstrom spacing using synchrotron radiation
Tunneling Mechanism due to Chaos in a Complex Phase Space
We have revealed that the barrier-tunneling process in non-integrable systems
is strongly linked to chaos in complex phase space by investigating a simple
scattering map model. The semiclassical wavefunction reproduces complicated
features of tunneling perfectly and it enables us to solve all the reasons why
those features appear in spite of absence of chaos on the real plane.
Multi-generation structure of manifolds, which is the manifestation of
complex-domain homoclinic entanglement created by complexified classical
dynamics, allows a symbolic coding and it is used as a guiding principle to
extract dominant complex trajectories from all the semiclassical candidates.Comment: 4 pages, RevTeX, 6 figures, to appear in Phys. Rev.
Extraterrestrial reliquefaction of cryogenic propellants Final report, May 1964 - Dec. 1965
Reliquefier design and cycles studied to reduce boiloff in extraterrestrial cryogenic propellant storag
Chemical Evolution in the Carina Dwarf Spheroidal
We present metallicities for 487 red giants in the Carina dwarf spheroidal
(dSph) galaxy that were obtained from FLAMES low-resolution Ca triplet (CaT)
spectroscopy. We find a mean [Fe/H] of -1.91 dex with an intrinsic dispersion
of 0.25 dex, whereas the full spread in metallicities is at least one dex. The
analysis of the radial distribution of metallicities reveals that an excess of
metal poor stars resides in a region of larger axis distances. These results
can constrain evolutionary models and are discussed in the context of chemical
evolution in the Carina dSph.Comment: 3 pages, 2 figures, to be published in the proceedings of the
ESO/Arcetri-workshop on "Chemical Abundances and Mixing in Stars", 13.-17.
Sep. 2004, Castiglione della Pescaia, Italy, L. Pasquini, S. Randich (eds.
Phase--coherence Effects in Antidot Lattices: A Semiclassical Approach to Bulk Conductivity
We derive semiclassical expressions for the Kubo conductivity tensor. Within
our approach the oscillatory parts of the diagonal and Hall conductivity are
given as sums over contributions from classical periodic orbits in close
relation to Gutzwiller's trace formula for the density of states. Taking into
account the effects of weak disorder and temperature we reproduce recently
observed anomalous phase coherence oscillations in the conductivity of large
antidot arrays.Comment: 11 pages, 2 figures available under request, RevTe
Artificial dielectric optical structures: A challenge for nanofabrication
Diffractive optical components can be made using multiple level kinoforms or single level artificial dielectric structures. The latter require the fabrication of pillars of equal depth but differing width and spacing. As a demonstration device, the diffractive optic equivalent of a wedge has been made in GaAs for use at 1.15 μm. The need for all pillars to have the same height was met by using a selective etch and a very thin etch-stop layer on AlGaAs. The experimental diffraction efficiency was 87.8%, among the best ever obtained and close to the theoretical maximum of 97.6%. © 1998 American Vacuum Society
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