46,406 research outputs found
Investigation of long term storage effects on aerospace nickel-cadmium cell performance
A study on evaluation of the long term storage effects on aerospace nickel-cadmium cells currently being performed at NASA/Goddard Space Flight Center (GSFC) is described. A number of cells of 6 Ah and 12 Ah capacities which were stored in shorted condition for 8 to 9 years at the GSFC were selected for this study. These cells will undergo electrical acceptance testing the the GSFC, and life cycling at the NASA Battery Test Facility at the Naval Weapons Facility at the Naval Weapons Support Center (NWSC) in Crane, Indiana; in addition, some cells from the study will undergo destructive analyses
The effect of post-election asymmetry information possibility on pre-election policy platform choices
In this paper, we examine the effect of a possibility of post-election information asymmetry between voters and candidates on pre-election policy platform choices by candidates. We show that this possibility may lead candidates to over commit during election campaign, which may contribute to an ex post moral hazard problem.Electoral competition, Ex-post information asymmetry, Moral hazard, Policy platform choice
Direct Fidelity Estimation from Few Pauli Measurements
We describe a simple method for certifying that an experimental device prepares a desired quantum state ρ. Our method is applicable to any pure state ρ, and it provides an estimate of the fidelity between ρ and the actual (arbitrary) state in the lab, up to a constant additive error. The method requires measuring only a constant number of Pauli expectation values, selected at random according to an importance-weighting rule. Our method is faster than full tomography by a factor of d, the dimension of the state space, and extends easily and naturally to quantum channels
Broad-line and Multi-wave Band Emission from Blazars
We study the correlations of the flux of the broad-line emission ()
with the X-ray emission flux, optical emission flux at 5500 \AA and radio
emission flux at 5 GHz, respectively, for a large sample of 50 Blazars (39
flat-spectrum radio quasars (FSRQs) and 11 BL Lac objects). Our main results
are as follows. There are very strong correlations between and
and between and in both states for 39 FSRQs and the
slopes of the linear regression equations are almost equal to 1. There are weak
correlations between and and between and
for 11 BL Lac objects in both states, and the slopes of the linear regression
equations are close to 1. There are significant correlations between
and and between and for 50 blazars in both states,
the slopes of both the linear regression equations are also close to 1. These
results support a close link between relativistic jets and accretion on to the
central Kerr black hole. On the other hand, we find that BL Lac objects have
low accretion efficiency , whereas FSRQs have high accretion efficiency
. The unified model of FSRQs and BL Lac objects is also discussed.Comment: 15 pages, 8 figure
Novel quantum phases of dipolar Bose gases in optical lattices
We investigate the quantum phases of polarized dipolar Bosons loaded into a
two-dimensional square and three-dimensional cubic optical lattices. We show
that the long-range and anisotropic nature of the dipole-dipole interaction
induces a rich variety of quantum phases, including the supersolid and striped
supersolid phases in 2D lattices, and the layered supersolid phase in 3D
lattices.Comment: 4 pages, 4 figure
Chemical Enhancements in Shock-accelerated Particles: Ab-initio Simulations
We study the thermalization, injection, and acceleration of ions with
different mass/charge ratios, , in non-relativistic collisionless shocks
via hybrid (kinetic ions-fluid electrons) simulations. In general, ions
thermalize to a post-shock temperature proportional to . When diffusive
shock acceleration is efficient, ions develop a non-thermal tail whose extent
scales with and whose normalization is enhanced as , so that
incompletely-ionized heavy ions are preferentially accelerated. We discuss how
these findings can explain observed heavy-ion enhancements in Galactic cosmic
rays.Comment: 6 pages, 4 figures, submitted to PR
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