43,916 research outputs found
Process for making RF shielded cable connector assemblies and the products formed thereby
A process for making RF shielded cable connector assemblies and the resulting structures is described. The process basically consists of potting wires of a shielded cable between the cable shield and a connector housing to fill in, support, regidize, and insulate the individual wires contained in the cable. The formed potting is coated with an electrically conductive material so as to form an entirely encompassing adhering conductive path between the cable shield and the metallic connector housing. A protective jacket is thereby formed over the conductive coating between the cable shield and the connector housing
Screening in Ionic Systems: Simulations for the Lebowitz Length
Simulations of the Lebowitz length, , are reported
for t he restricted primitive model hard-core (diameter ) 1:1 electrolyte
for densi ties and .
Finite-size eff ects are elucidated for the charge fluctuations in various
subdomains that serve to evaluate . On extrapolation to the
bulk limit for the low-density expansions (Bekiranov and
Fisher, 1998) are seen to fail badly when (with ). At highe r densities rises above the Debye
length, \xi_{\text{D}} \prop to \sqrt{T/\rho}, by 10-30% (upto ); the variation is portrayed fairly well by generalized
Debye-H\"{u}ckel theory (Lee and Fisher, 19 96). On approaching criticality at
fixed or fixed , remains finite with
but displays a
weak entropy-like singularity.Comment: 4 pages 5 figure
NASA micromin computer Monthly progress letter, Jan. 1967
Microminiature circuit development for flight control computer
The Small Scale Velocity Dispersion of Galaxies: A Comparison of Cosmological Simulations
The velocity dispersion of galaxies on small scales ( Mpc),
, can be estimated from the anisotropy of the galaxy-galaxy
correlation function in redshift space. We apply this technique to
``mock-catalogs'' extracted from N-body simulations of several different
variants of Cold Dark Matter dominated cosmological models to obtain results
which may be consistently compared to similar results from observations. We
find a large variation in the value of in different
regions of the same simulation. We conclude that this statistic should not be
considered to conclusively rule out any of the cosmological models we have
studied. We attempt to make the statistic more robust by removing clusters from
the simulations using an automated cluster-removing routine, but this appears
to reduce the discriminatory power of the statistic. However, studying
as clusters with different internal velocity dispersions are
removed leads to interesting information about the amount of power on cluster
and subcluster scales. We also compute the pairwise velocity dispersion
directly and compare this to the values obtained using the Davis-Peebles
method, and find that the agreement is fairly good. We evaluate the models used
for the mean streaming velocity and the pairwise peculiar velocity distribution
in the original Davis-Peebles method by comparing the models with the results
from the simulations.Comment: 20 pages, uuencoded (Latex file + 8 Postscript figures), uses AAS
macro
A study of the usefulness of Skylab EREP data for earth resources studies in Australia
There are no author-identified significant results in this report
Entanglement in general two-mode continuous-variable states: local approach and mapping to a two-qubit system
We present a new approach to the analysis of entanglement in smooth bipartite
continuous-variable states. One or both parties perform projective filterings
via preliminary measurements to determine whether the system is located in some
region of space; we study the entanglement remaining after filtering. For small
regions, a two-mode system can be approximated by a pair of qubits and its
entanglement fully characterized, even for mixed states. Our approach may be
extended to any smooth bipartite pure state or two-mode mixed state, leading to
natural definitions of concurrence and negativity densities. For Gaussian
states both these quantities are constant throughout configuration space.Comment: 4 pages, RevTeX 4, one figure. Further modifications in response to
journal referees, correction to expression for negativit
Universality of Ionic Criticality: Size- and Charge-Asymmetric Electrolytes
Grand canonical simulations designed to resolve critical universality classes
are reported for :1 hard-core electrolyte models with diameter ratios
. For Ising-type behavior prevails.
Unbiased estimates of are within 1% of previous (biased)
estimates but the critical densities are 5 % lower. Ising character is
also established for the 2:1 and 3:1 equisized models, along with critical
amplitudes and improved estimates. For , however, strong
finite-size effects reduce the confidence level although classical and O criticality are excluded.Comment: 4 pages, 3 figure
Current-voltage scaling of chiral and gauge-glass models of two-dimensional superconductors
The scaling behavior of the current-voltage characteristics of chiral and
gauge glass models of disordered superconductors, are studied numerically, in
two dimensions. For both models, the linear resistance is nonzero at finite
temperatures and the scaling analysis of the nonlinear resistivity is
consistent with a phase transition at T=0 temperature characterized by a
diverging correlation length and thermal critical
exponent . The values of , however, are found to be different
for the chiral and gauge glass models, suggesting different universality
classes, in contrast to the result obtained recently in three dimensions.Comment: 4 pages, 4 figures (included), to appear in Phys. Rev.
EuSrMnO: a three-dimensional XY spin glass
The frequency, temperature, and dc-bias dependence of the ac-susceptibility
of a high quality single crystal of the EuSrMnO layered
manganite is investigated. EuSrMnO behaves like a XY spin
glass with a strong basal anisotropy. Dynamical and static scalings reveal a
three-dimensional phase transition near = 18 K, and yield critical
exponent values between those of Heisenberg- and Ising-like systems, albeit
slightly closer to the Ising case. Interestingly, as in the latter system, the
here observed rejuvenation effects are rather weak. The origin and nature of
the low temperature XY spin glass state is discussed.Comment: REVTeX 4 style; 5 pages, 4 figure
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