42,317 research outputs found

    Launch Operations: Prelaunch Activities

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    Prelaunch activities, countdown and launch for Nimbus 3 satellite

    The capture time of grids

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    We consider the game of Cops and Robber played on the Cartesian product of two trees. Assuming the players play perfectly, it is shown that if there are two cops in the game, then the length of the game (known as the 2-capture time of the graph) is equal to half the diameter of the graph. In particular, the 2-capture time of the m x n grid is proved to be floor ((m+n-2)/2).Comment: 7 page

    Modelling of dimensional stability of fiber reinforced composite materials

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    Various methods of predicting the expansion and diffusion properties of composite laminates are reviewed. The prediction equations for continuous fiber composites can be applied to SMC composites as the effective fiber aspect ratio in the latter is large enough. The effect of hygrothermal expansion on the dimensional stability of composite laminates was demonstrated through the warping of unsymmetric graphite/epoxy laminates. The warping is very sensitive to the size of the panel, and to the moisture content which is in turn sensitive to the relative humidity in the environment. Thus, any long term creep test must be carried out in a humidity-controlled environment. Environmental effects in SMC composites and bulk polyester were studied under seven different environments. The SMC composites chosen are SMC-R25, SMC-R40, and SMC-R65

    Field dependence of gaseous ion mobility: Test of approximate formulas

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    The accuracies of three approximate formulas were tested by comparison with special cases for which accurate results could be found. The Wannier free flight theory was found to be superior, and can be extended to yield a formula without further adjustable constants that gives an exact result at low electric fields and good results at medium and high fields. It is applicable for any ion neutral force law and mass ratio

    Fully automated calculation in fermion scattering

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    The package aITALC has been developed for fully automated calculations of two fermion production at e+ e- collider and other similar reactions. We emphasize the connection and interoperability between the different modules required for the calculation and the external tools Diana, Form and LoopTools. Results for e+ e- -> f anti-f, e+ e- are presented.Comment: 5 pages, 2 tables, 2 figures. Contribution to the X International Workshop on Advanced Computing and Analysis Techniques in Physics Research, ACAT 2005, May 22-27, 2005, Zeuthen (Germany

    Dynamical Polarizabilities of SU(3) Octet of Baryons

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    We present calculations and an analysis of the spin-independent dipole electric and magnetic dynamical polarizabilities for the lowest in mass SU(3) octet of baryons. These extensive calculations are made possible by the recent implementation of semi-automatized calculations in Chiral Perturbation Theory which allows evaluating dynamical spin-independent electromagnetic polarizabilities from Compton scattering up to next-to-the-leading order. Our results are in good agreement with calculations performed for nucleons found in the literature. The dependencies for the range of photon energies up to 1 GeV, covering the majority of the meson photo production channels, are analyzed. The separate contributions into polarizabilities from the various baryon meson clouds are studied.Comment: 10 pages, 7 figures, extended analysis of hyperon polarizabilitie

    Clementine Observations of the Zodiacal Light and the Dust Content of the Inner Solar System

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    Using the Moon to occult the Sun, the Clementine spacecraft used its navigation cameras to map the inner zodiacal light at optical wavelengths over elongations of 3-30 degrees from the Sun. This surface brightness map is then used to infer the spatial distribution of interplanetary dust over heliocentric distances of about 10 solar radii to the orbit of Venus. We also apply a simple model that attributes the zodiacal light as being due to three dust populations having distinct inclination distributions, namely, dust from asteroids and Jupiter-family comets (JFCs), dust from Halley-type comets, and an isotropic cloud of dust from Oort Cloud comets. The best-fitting scenario indicates that asteroids + JFCs are the source of about 45% of the optical dust cross-section seen in the ecliptic at 1 AU, but that at least 89% of the dust cross-section enclosed by a 1 AU radius sphere is of a cometary origin. When these results are extrapolated out to the asteroid belt, we find an upper limit on the mass of the light-reflecting asteroidal dust that is equivalent to a 12 km asteroid, and a similar extrapolation of the isotropic dust cloud out to Oort Cloud distances yields a mass equivalent to a 30 km comet, although the latter mass is uncertain by orders of magnitude.Comment: To be published in Icaru

    Wash-Out in N_2-dominated leptogenesis

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    We study the wash-out of a cosmological baryon asymmetry produced via leptogenesis by subsequent interactions. Therefore we focus on a scenario in which a lepton asymmetry is established in the out-of-equilibrium decays of the next-to-lightest right-handed neutrino. We apply the full classical Boltzmann equations without the assumption of kinetic equilibrium and including all quantum statistical factors to calculate the wash-out of the lepton asymmetry by interactions of the lightest right-handed state. We include scattering processes with top quarks in our analysis. This is of particular interest since the wash-out is enhanced by scatterings and the use of mode equations with quantum statistical distribution functions. In this way we provide a restriction on the parameter space for this scenarios.Comment: 26 pages, 4 figures, profound revision, exposition is now in flavor notation, one plot and discussion added, numerical error corrected, three plots changed, text polished, main results remain unchanged, reference added,matches published versio

    Roman Judicial Procedure with Reference to the Trial of Jesus Christ

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    A concession of the greatest importance was this, that the Sanhedrin was permitted to continue and exercise its power in the internal government of Jewish affairs. In the days of Jesus, the Sanhedrin had legislative, executive, and judicial powers. It commanded a body of police for the purpose of making arrests, (Mat 26,47; Mark 14,43). It had the power to prefer charges and try cases of a religious nature, in which the procurator would not meddle. From its decision there could be no appeal; it was the highest court. In connection with the Great Sanhderin, there was an organized system of smaller courts, which were under the control of the general body, and connected with the synagogs in the lands, even outside Judaea. In this way they exerted power against Jesus in Galilee, and it was to such a body in Damascus that Saul was bearing letters from the Sandhedrin of Jerusalem. The great limitation to the power of the Sanhedrin is expressed in the Talmud, “Forty years before the destruction of the temple, the power of inflicting capital punishment was taken away from Israel ; and the Jews admit to Pilate, (John 18,31), that it is not lawful for them to put any men to death. The Sanhedrin might inflict minor punishments, such as beating, (Acts 5,40); it could decide in matter s of life and death, could pronounce the sentence of death, but it could not inflict capital punishment
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