70,506 research outputs found
CINDA - Chrysler Improved Numerical Differencing Analyzer computer program
Dimensionless multioption systems compiler computer program constructs and analyzes a mathematical model of any arbitrary one, two, or three dimensional lumped parameter representation of a physical system. It automatically optimizes the utilization of computer core space and is more general and versatile than BETA
Coal pressurization and feeding: Use of a lock hopper system
Operation of a synthane gasifier pilot plant is discussed. The specific problems experienced with the operation of the Petrocarb system at the pilot plant are described along with modifications made to improve its performance
Chrysler improved numerical differencing analyzer for third generation computers CINDA-3G
New and versatile method has been developed to supplement or replace use of original CINDA thermal analyzer program in order to take advantage of improved systems software and machine speeds of third generation computers. CINDA-3G program options offer variety of methods for solution of thermal analog models presented in network format
Linear effects of perturbed recombination
Perturbations in the ionization fraction after recombination affect the
Compton cooling of density perturbations. Once the gas temperature starts to
decouple from the CMB temperature, ionization fraction perturbations can have a
significant influence on the subsequent gas temperature perturbation evolution.
This directly affects the 21cm spin temperature of the gas, and also modifies
the small-scale baryon perturbation evolution via the difference in baryon
pressure. The effect on the gas temperature perturbations can be significant on
all scales, and galactic-scale baryon perturbations are modified at the percent
level at redshifts z >~ 100 where numerical simulations are typically started.Comment: 5 pages; for more details of effect on 21cm see astro-ph/0702600;
code available at http://camb.info/sources
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Atmospheric modelling for NOMAD-UVIS on board the ExoMars Trace Gas Orbiter mission
The Ultraviolet and Visible Spectrometer (UVIS) instrument development process requires the construction of an atmospheric model to provide synthetic UV transmission spectra. We discuss the requirements of the model to enable observational limits to be found, and the potential for certain atmospheric parameters to be further constrained
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