19,796 research outputs found
Inorganic thermal control pigment Patent
White paint production by heating impure aluminum silicate clay having low solar absorptanc
The Fallacy of Nuclear Primacy
"The United States is easily deterred by any nuclear armed state, even by the most primitive and diminutive of nuclear arsenals." Bruce G. Blair is the President of the World Security Institute. Chen Yali is the editor in chief of Washington Observer
The Oil Weapon: Myth of China's Vulnerability
The geopolitical canvass on which China plots its strategy for energy security displays a ubiquitous presence of one country: the United States. Chinese energy security planners must reckon with America's ravenous consumption of imported oil, its strategic alliances with other heavy importers of oil in Asia, its overseas military operations in the heart of the world's leading oil producing region, its naval dominion over the world's oil transportation routes, and the global domination of U.S. oil companies or multinational oil companies heavily capitalized by American investment. This is the context in which China pursues its energy security, sometimes blandly described as 'conservation and diversification of supply', which masks the nation's real struggle to satisfy its rapidly growing energy needs without exposing its energy lifelines to external forces that may, intentionally or not, betray China's interests
The Reconstruction of Supersymmetric Theories at High Energy Scales
The reconstruction of fundamental parameters in supersymmetric theories
requires the evolution to high scales, where the characteristic regularities in
mechanisms of supersymmetry breaking become manifest. We have studied a set of
representative examples in this context: minimal supergravity and a left--right
symmetric extension; gauge mediated supersymmetry breaking; and superstring
effective field theories. Through the evolution of the parameters from the
electroweak scale the regularities in different scenarios at the high scales
can be unravelled if precision analyses of the supersymmetric particle sector
at e+ e- linear colliders are combined with analyses at the LHC.Comment: 36 pages, latex, 6 figure
Constructive characterizations of the value function of a mixed-integer program / BEBR No. 784
Bibliography: p. [44]-[45]
ROSAT observations of two 'cooling flow' EMSS Galaxies
We present ROSAT observations of two luminous L~10^44 erg/s EMSS galaxies,
MS1019+5139 and MS1209+3917, previously classified as 'cooling flow' galaxies.
MS1019+5139 does not appear to be spatially extended (<13 kpc) while its
spectrum is well fit by a power law with Gamma = 1.73 +0.19-0.18; X-ray
variability on a timescale of ~ years is also clearly detected. MS1209+3917
shows no evidence of spatial extension (<50 kpc) but it shows variability,
while its spectrum can be fit with thermal bremsstrahlung emission (kT=1.8
+0.9-0.4 keV) or a power law model (Gamma = 2.50 +0.44-0.42, but with excess
photoelectric absorption above the Galactic value). All the above argue against
thermal emission from a group of galaxies or a galaxy but in favour of an AGN
(possibly BL Lac) interpretation. We conclude that no 'normal' galaxies with
high X-ray luminosities have yet been detected in the EMSS survey that could be
significant contributors to the X-ray background.Comment: 6 pages, LaTeX, 6 postscript figures included, to appear in MNRA
Numerical calculations of diffraction losses in advanced interferometric gravitational wave detectors
Knowledge of the diffraction losses in higher-order modes of large optical cavities is essential for predicting three-mode parametric photon-phonon scattering, which can lead to mechanical instabilities in long-baseline gravitational wave detectors. We explore different numerical methods in order to determine the diffraction losses of the higher-order optical modes. Diffraction losses not only affect the power buildup inside the cavity but also influence the shape and frequency of the mode, which ultimately affect the parametric instability gain. Results depend on both the optical mode shape (order) and the mirror diameter. We also present a physical interpretation of these results
Extraction of energy from gravitational waves by laser interferometer detectors
In this paper we discuss the energy interaction between gravitational waves
and laser interferom- eter gravitational wave detectors. We show that the
widely held view that the laser interferometer gravitational wave detector
absorbs no energy from gravitational waves is only valid under the
approximation of a frequency-independent optomechanical coupling strength and a
pump laser without detuning with respect to the resonance of the
interferometer. For a strongly detuned interferometer, the optical-damping
dynamics dissipates gravitational wave energy through the interaction between
the test masses and the optical field. For a non-detuned interferometer, the
frequency-dependence of the optomechanical coupling strength causes a tiny
energy dissipation, which is proved to be equivalent to the Doppler friction
raised by Braginsky et.al.Comment: 20 pages, 7 figure
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