39,126 research outputs found
W Mass at LEP and Standard Model Fits
The W-mass measurements from LEP and the results of a global fit of the
Standard Model parameters to the electroweak data are presented. Comprehensive
studies of experimental systematic effects allowed a measurement of the W mass
with an accuracy of better than half a permill. Especially the recent
improvements in the LEP energy calibration, the modelling of the hadronisation
process and the understanding of Bose-Einstein correlations and colour
reconnection effects are discussed. The fit of the Standard Model parameters to
all electroweak measurements verifies the self-consistency of the theory. The
combination of all electroweak data yield information on the mass of the still
undiscovered Higgs boson, .Comment: Proceedings of the XLIst Recontres de Moriond, La Thuile, March 200
The scatter of mechanical values of carbon fiber composites and its causes
The scatter of experimental data obtained in an investigation of the parameters of structural components was investigated. Strength parameters which are determined by the resin or the adhesion between fiber and resin were included. The statistical characteristics of the mechanical parameters of carbon fiber composites, and the possibilities which exist to reduce this scatter were emphasized. It is found that quality control tests of fiber and resin are important for such a reduction
Thermal detector model for cryogenic composite detectors for the dark matter experiments CRESST and EURECA
The CRESST (Cryogenic Rare Event Search with Superconducting Thermometers)
and the EURECA (European Underground Rare Event Calorimeter Array) experiments
are direct dark matter search experiments where cryogenic detectors are used to
detect spin-independent, coherent WIMP (Weakly Interacting Massive
Particle)-nucleon scattering events by means of the recoil energy. The
cryogenic detectors use a massive single crystal as absorber which is equipped
with a TES (transition edge sensor) for signal read-out. They are operated at
mK-temperatures. In order to enable a mass production of these detectors, as
needed for the EURECA experiment, a so-called composite detector design (CDD)
that allows decoupling of the TES fabrication from the optimization procedure
of the absorber single-crystal was developed and studied. To further
investigate, understand and optimize the performance of composite detectors a
detailed thermal detector model which takes into account the CDD has been
developed.Comment: To appear in Journal of Physics: Conference Series; Proceedings of
Neutrino 2008, Christchurch, New Zealan
Depletion potentials near geometrically structured substrates
Using the recently developed so-called White Bear version of Rosenfeld's
Fundamental Measure Theory we calculate the depletion potentials between a
hard-sphere colloidal particle in a solvent of small hard spheres and simple
models of geometrically structured substrates: a right-angled wedge or edge. In
the wedge geometry, there is a strong attraction beyond the corresponding one
near a planar wall that significantly influences the structure of colloidal
suspensions in wedges. In accordance with an experimental study, for the edge
geometry we find a free energy barrier of the order of several which
repels a big colloidal particle from the edge.Comment: 7 pages, 7 figure
Binary hard-sphere fluids near a hard wall
By using the Rosenfeld density functional we determine the number density
profiles of both components of binary hard-sphere fluids close to a planar hard
wall as well as the corresponding excess coverage and surface tension. The
comparison with published simulation data demonstrates that the Rosenfeld
functional, both its original version and sophistications thereof, is superior
to previous approaches and exhibits the same excellent accuracy as known from
studies of the corresponding one-component system
Light environment - A. Visible light. B. Ultraviolet light
Visible and ultraviolet light environment as related to human performance and safety during space mission
- …