2,503 research outputs found
The careers and qualifications of members of the Federal Communications Commission, 1961 to 1976.
In 1957, the House Interstate and Foreign Commerce Committee hired an expert on government administrative agencies to head the investigate staff of its Special Subcommittee on Legislative Oversight. That expert, Bernard Schwartz, New York University Professor, believed the Subcommittee intended to check on the sort of job the independent administrative agencies were doing. When he began to uncover evidence of misconduct in the agencies, however, he learned that the commerce committee had no such intention. Schwartz then realized that he had been hired as a harmless, academic type who could be counted on to confine himself to ivory tower legal theory without delving into embarrassing practical matters
Randomised controlled trial of specialist nurse intervention in heart failure
<p>Objectives. To determine whether specialist nurse intervention improves outcome in patients with chronic heart failure.</p>
<p>Design. Randomised controlled trial.</p>
<p>Setting. Acute medical admissions unit in a teaching hospital.</p>
<p>Participants. 165 patients admitted with heart failure due to left ventricular systolic dysfunction. The intervention started before discharge and continued thereafter with home visits for up to 1 year.</p>
<p>Main outcome measures. Time to first event analysis of death from all causes or readmission to hospital with worsening heart failure.</p>
<p>Results. 31 patients (37%) in the intervention group died or were readmitted with heart failure compared with 45 (53%) in the usual care group (hazard ratio=0.61, 95% confidence interval 0.33 to 0.96).Compared with usual care, patients in the intervention group had fewer readmissions for any reason (86 v 114, P=0.018), fewer admissions for heart failure (19 v 45, P<0.001) and spent fewer days in hospital for heart failure (mean 3.43 v 7.46 days, P=0.0051).</p>
<p>Conclusions. Specially trained nurses can improve the outcome of patients admitted to hospital with heart failure.</p>
Strichartz estimates on Schwarzschild black hole backgrounds
We study dispersive properties for the wave equation in the Schwarzschild
space-time. The first result we obtain is a local energy estimate. This is then
used, following the spirit of earlier work of Metcalfe-Tataru, in order to
establish global-in-time Strichartz estimates. A considerable part of the paper
is devoted to a precise analysis of solutions near the trapping region, namely
the photon sphere.Comment: 44 pages; typos fixed, minor modifications in several place
Development of planar pixel modules for the ATLAS high luminosity LHC tracker upgrade
The high-luminosity LHC will present significant challenges for tracking systems. ATLAS is preparing to upgrade the entire tracking system, which will include a significantly larger pixel detector. This paper reports on the development of large area planar detectors for the outer pixel layers and the pixel endcaps. Large area sensors have been fabricated and mounted onto 4 FE-I4 readout ASICs, the so-called quad-modules, and their performance evaluated in the laboratory and testbeam. Results from characterisation of sensors prior to assembly, experience with module assembly, including bump-bonding and results from laboratory and testbeam studies are presented
Proton Driven Plasma Wakefield Acceleration
Plasma wakefield acceleration, either laser driven or electron-bunch driven,
has been demonstrated to hold great potential. However, it is not obvious how
to scale these approaches to bring particles up to the TeV regime. In this
paper, we discuss the possibility of proton-bunch driven plasma wakefield
acceleration, and show that high energy electron beams could potentially be
produced in a single accelerating stage.Comment: 13 pages, 4 figure
Linearized gravity and gauge conditions
In this paper we consider the field equations for linearized gravity and
other integer spin fields on the Kerr spacetime, and more generally on
spacetimes of Petrov type D. We give a derivation, using the GHP formalism, of
decoupled field equations for the linearized Weyl scalars for all spin weights
and identify the gauge source functions occuring in these. For the spin weight
0 Weyl scalar, imposing a generalized harmonic coordinate gauge yields a
generalization of the Regge-Wheeler equation. Specializing to the Schwarzschild
case, we derive the gauge invariant Regge-Wheeler and Zerilli equation directly
from the equation for the spin 0 scalar.Comment: 24 pages, corresponds to published versio
Examination of silver-graphite lithographically printed resistive strain sensors
This paper reports the design and manufacture of three differing types of resistive strain sensitive structures fabricated using the Conductive Lithographic Film (CLF) printing process. The structures, utilising two inks prepared with silver and graphite particulates as the conductive phase, have been analysed to determine electrical and mechanical properties with respect to strain, temperature and humidity when deposited on four alternative substrate materials (GlossArt, PolyArt, Teslin and Melinex)
Gestió dels recursos hÃdrics del Monestir Budista Sakya Tashi Ling
Amb la finalitat de millorar l'autosuficiència hÃdrica del monestir budista del Garraf Sakya Tashi Ling, es fa una avaluació de l'estat dels recursos hÃdrics d'aquest sistema, aixà com els seus usos i punts de consum. L'avaluació s'ha realitzat mitjançant la integració i ús deCon el fin de mejorar la autosuficiencia hÃdrica del monasterio budista del Garraf Sakya Tashi Ling, se hace una evaluación del estado de los recursos hÃdricos de esteIn order to improve the water self-sufficiency of Garraf's Buddhist monastery Sakya Tashi Ling, this project provide
Island diffusion on metal fcc(100) surfaces
We present Monte Carlo simulations for the size and temperature dependence of
the diffusion coefficient of adatom islands on the Cu(100) surface. We show
that the scaling exponent for the size dependence is not a constant but a
decreasing function of the island size and approaches unity for very large
islands. This is due to a crossover from periphery dominated mass transport to
a regime where vacancies diffuse inside the island. The effective scaling
exponents are in good agreement with theory and experiments.Comment: 13 pages, 2 figures, to be published in Phys. Rev. Let
A proof of the uniform boundedness of solutions to the wave equation on slowly rotating Kerr backgrounds
We consider Kerr spacetimes with parameters a and M such that |a|<< M,
Kerr-Newman spacetimes with parameters |Q|<< M, |a|<< M, and more generally,
stationary axisymmetric black hole exterior spacetimes which are sufficiently
close to a Schwarzschild metric with parameter M>0, with appropriate geometric
assumptions on the plane spanned by the Killing fields. We show uniform
boundedness on the exterior for sufficiently regular solutions to the scalar
homogeneous wave equation. In particular, the bound holds up to and including
the event horizon. No unphysical restrictions are imposed on the behaviour of
the solution near the bifurcation surface of the event horizon. The pointwise
estimate derives in fact from the uniform boundedness of a positive definite
energy flux. Note that in view of the very general assumptions, the
separability properties of the wave equation on the Kerr background are not
used.Comment: 71 pages, 3 figure
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