53 research outputs found
Supermassive black holes in scalar field galaxy halos
Ultra-light scalar fields provide an interesting alternative to WIMPS as halo
dark matter. In this paper we consider the effect of embedding a supermassive
black hole within such a halo, and estimate the absorption probability and the
accretion rate of dark matter onto the black hole. We show that the accretion
rate would be small over the lifetime of a typical halo, and hence that
supermassive central black holes can coexist with scalar field halos.Comment: 5 pages RevTex4, no figures. Updated file to match published versio
Molecular cloning and transcriptional analysis of the alkyl hydroperoxide reductase genes from Pseudomonas putida KT2442.
Characterization of the microstructure and phase formation in the Au–In system using transmission electron microscopy
A Selenocysteine-Containing Peroxiredoxin from the Strictly Anaerobic Organism Eubacterium acidaminophilum
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Design of the second generation XRS detector
Microcalorimeter performance is limited by non-ideal effects that were not included in the standard theory of bolometers and microcalorimeters developed 20 years ago by Mather (Appl. Opt. 21 (1982) 1125). These include the hot-electron effect, absorber decoupling, thermometer non-ohmic behavior, and all related extra noise sources. Models that include these effects have been developed and can be used to optimize the design of microcalorimeters for best performance. The design of the array for the XRS detector on the Astro-E2 satellite was completely optimized based on the required performance and on the characteristics of the materials used. The characteristic heat capacity and thermal conductivity of all the detector components have been measured and the values have been used as input to the models to design the detector geometry for best performance. Mechanical modeling has also been carried out in parallel to ensure the mechanical integrity of the microcalorimeter. We report here the analysis involved in the optimization of the detectors, and the comparison between modeled and measured performance
Reactive oxygen species are the major antibacterials against Salmonella Typhimurium purine auxotrophs in the phagosome of RAW 264.7 cells
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