نتایج جستجو برای: raytheon
تعداد نتایج: 169 فیلتر نتایج به سال:
A supersonic coaxial jet facility has been designed to provide experimental data suitable for the validation of CFD codes used to analyze high-speed propulsion flows. The center jet is of a light gas and the coflow jet is of air, and the mixing layer between them is compressible. Various methods have been employed in characterizing the jet flow field, including schlieren visualization, pitot, t...
The [CII] 157.74 μm transition is the dominant coolant of the neutral interstellar gas, and has great potential as a star formation rate (SFR) tracer. Using the Herschel KINGFISH sample of 46 nearby galaxies, we investigate the relation of [CII] surface brightness and luminosity with SFR. We conclude that [CII] can be used for measurements of SFR on both global and kiloparsec scales in normal s...
Farmers must balance the competing goals of supplying contributions of background reflectance, while spectral vegetation indices that combined reflectances of near-infrared adequate N for their crops while minimizing N losses to the environment. To characterize the spatial variability of N and other visible bands (MCARI and NIR/Green) were responsive to both leaf chlorophyll concentrations and ...
abstract the mosaic art as a decorative element in buildings enjoys several thousand years of age in egypt, mesopotamia, greece, rome and byzantium and is widely usedbut technically speaking, the earliest mosaic forms have poorly made. they were made by insertion of fruit cores or broken pottery pieces in the wet mud mortar of walls. later, the art evolved rapidly and extensively used for archi...
Primary production in the Ross Sea, one of the most productive areas in the Southern Ocean, has previously been shown to be seasonally limited by iron. In two of three bottle incubation experiments conducted in the austral summer, significantly higher chlorophyll a (Chl a) concentrations were measured upon the addition of iron and B12, relative to iron additions alone. Initial bacterial abundan...
We present a detailed analysis of week-long simultaneous observations of the blazar Mrk 421 at 2–60 keV X-rays (RossiXTE) and TeV γ-rays (Whipple and HEGRA) in 2001. Accompanying optical monitoring was performed with the Mt. Hopkins 48" telescope. The unprecedented quality of this dataset enables us to establish the existence of the correlation between the TeV and X-ray luminosities, and also t...
The isolation of tissue transplantation antigens has been energetically pursued since Billingham et al.' found that cell extracts could induce homograft immunity. A major problem in this endeavor has been the solubilization of the antigens which probably reside on cellular membranes. Studies employing tissue homogenization' and pressure decompression' to disrupt cells have yielded insoluble ant...
The Thermal Emission Spectrometer (TES) investigation on Mars Global Surveyor (MGS) is aimed at determining (1) the composition of surface minerals, rocks, and ices; (2) the temperature and dynamics of the atmosphere; (3) the properties of the atmospheric aerosols and clouds; (4) the nature of the polar regions; and (5) the thermophysical properties of the surface materials. These objectives ar...
A “jump” in the blue horizontal-branch (HB) distribution in the V , u − y color-magnitude diagram has recently been detected in the globular cluster (GC) M13 (NGC 6205) by Grundahl, VandenBerg, & Andersen (1998). Such an effect is morphologically best characterized as a discontinuity in the u, u− y locus, with stars in the range 11,500 K . Teff . 20,000 K deviating systematically from (in the s...
We previously reported the isolation of the aneuploid MCH line of Chinese hamster cells from a normal line originally derived by Dr. George Yerganian from female adult fibroblast derivatives which formed a short-term carrier state with herpes simplex virus.1 We also reported the occurrence of chromosomal aberrations during the first postinfection division with this virus, and subsequently the p...
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