Study to determine the thermophysical properties of ablative materials Summary report

Thermophysical properties of ablative materials - phenolic resin

Space storable thruster investigation Final report, Jul. 1967 - Nov. 1968

Cooling techniques for space storable reaction control thrustor

Influências de usinas hidrelétricas no funcionamento hidro-ecológico do Pantanal Mato-Grossense - recomendações.

Esta publicação tem como objetivo registrar e divulgar as recomendações resultantes do Workshop ?Influências de usinas hidrelétricas no funcionamento hidro-ecológico do Pantanal, Brasil? realizado durante o VIII INTECOL ? Conferência Internacional de Áreas Úmidas, em Cuiabá (20-25 de julho de 2008), que teve como objetivo embasar tecnicamente e de forma multidisciplinar a discussão sobre a conservação dos processos hidrológicos que regem o funcionamento e as inter-relações ecológicas características do Pantanal Mato-Grossense. O documento discute com propriedade a importância dos chamados ?pulsos de inundação?, ou ciclos de cheias e secas anuais e interanuais, os quais influenciam, por sua vez, as relações sociais, culturais e econômicas da população pantaneira. Este trabalho também mostra a preocupação dos participantes deste encontro científico com relação às intervenções previstas na bacia, que podem alterar o seu regime hidrológico, prejudicando a sustentabilidade da região.bitstream/CPAP-2010/57285/1/DOC102.pd

Timely disclosure of progress in childhood cancer survival by 'period' analysis in the Automated Childhood Cancer Information System

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Criterion for phase separation in one-dimensional driven systems

A general criterion for the existence of phase separation in driven one-dimensional systems is proposed. It is suggested that phase separation is related to the size dependence of the steady-state currents of domains in the system. A quantitative criterion for the existence of phase separation is conjectured using a correspondence made between driven diffusive models and zero-range processes. Several driven diffusive models are discussed in light of the conjecture

Evaluation of animal models of neurobehavioral disorders

Animal models play a central role in all areas of biomedical research. The process of animal model building, development and evaluation has rarely been addressed systematically, despite the long history of using animal models in the investigation of neuropsychiatric disorders and behavioral dysfunctions. An iterative, multi-stage trajectory for developing animal models and assessing their quality is proposed. The process starts with defining the purpose(s) of the model, preferentially based on hypotheses about brain-behavior relationships. Then, the model is developed and tested. The evaluation of the model takes scientific and ethical criteria into consideration

Nucleon-Nucleon Optical Model for Energies to 3 GeV

Several nucleon-nucleon potentials, Paris, Nijmegen, Argonne, and those derived by quantum inversion, which describe the NN interaction for T-lab below 300$ MeV are extended in their range of application as NN optical models. Extensions are made in r-space using complex separable potentials definable with a wide range of form factor options including those of boundary condition models. We use the latest phase shift analyses SP00 (FA00, WI00) of Arndt et al. from 300 MeV to 3 GeV to determine these extensions. The imaginary parts of the optical model interactions account for loss of flux into direct or resonant production processes. The optical potential approach is of particular value as it permits one to visualize fusion, and subsequent fission, of nucleons when T-lab above 2 GeV. We do so by calculating the scattering wave functions to specify the energy and radial dependences of flux losses and of probability distributions. Furthermore, half-off the energy shell t-matrices are presented as they are readily deduced with this approach. Such t-matrices are required for studies of few- and many-body nuclear reactions.Comment: Latex, 40 postscript pages including 17 figure

Dynamical Localization: Hydrogen Atoms in Magnetic and Microwave fields

We show that dynamical localization for excited hydrogen atoms in magnetic and microwave fields takes place at quite low microwave frequency much lower than the Kepler frequency. The estimates of localization length are given for different parameter regimes, showing that the quantum delocalization border drops significantly as compared to the case of zero magnetic field. This opens up broad possibilities for laboratory investigations.Comment: revtex, 11 pages, 3 figures, to appear in Phys. Rev. A, Feb (1997

Spontaneous Symmetry Breaking in Two-Channel Asymmetric Exclusion Processes with Narrow Entrances

Multi-particle non-equilibrium dynamics in two-channel asymmetric exclusion processes with narrow entrances is investigated theoretically. Particles move on two parallel lattices in opposite directions without changing them, while the channels are coupled only at the boundaries. A particle cannot enter the corresponding lane if the exit site of the other lane is occupied. Stationary phase diagrams, particle currents and densities are calculated in a mean-field approximation. It is shown that there are four stationary phases in the system, with two of them exhibiting spontaneous symmetry breaking phenomena. Extensive Monte Carlo computer simulations confirm qualitatively our predictions, although the phase boundaries and stationary properties deviate from the mean-field results. Computer simulations indicate that several dynamic and phase properties of the system have a strong size dependency, and one of the stationary phases predicted by the mean-field theory disappears in the thermodynamic limit.Comment: 13 page