Implications of the IRAS data for galactic gamma-ray astronomy and EGRET /

"To appear in the Proceeding of the EGRET Science Symposium."

Space shuttle : EVA opportunities.

Bibliography: p. 20.

STS 26 : flight of Discovery : NASA & U.S. industry explore America's new economic frontier.

"8/88."

Combustion of metals.

"Paper to be presented at the 17th annual meeting and space Flight Exposition, American Rocket Society, Los Angeles, Calif., November 13-18, 1962."

Space (collection of articles)

"FTD-MT-64-239. Edited machine translation."

Hypersonic free flight research.

pt. 1 Instrumentation evaluation and data analysis, by R. W. Bogle and R. J. Magnus.--pt. 2 Investigations of heat trasfer and aerodynamic stability, by O. R. Burggraf.

Government reports index.

Cumulation of the quarterly publication.

The lower tiers of the space transportation industrial base.

Mode of access: Internet.

Improved method of detecting and counting bacteria. /

Address inquiries and all applications for license for this invention to NASA Patent Counsel, Goddard Space Flight Center, Mail Code 204, Greenbelt, Maryland, 20771.

Study of the solar cycle from space : proceedings of a symposium /

Includes bibliographical references.

Advanced automation for space missions : proceedings of the 1980 NASA/ASEE Summer Study /

Includes bibliographies.

Space programs summary

Mode of access: Internet.

Sketch of the life and literary career of Augustus von Kotzebue; with the journal of his tour to Paris, at the close of the year 1790.

Running titles: Life of Kotzebue; My flight to Paris.

Quantum phase-space simulations of fermions and bosons

We introduce a unified Gaussian quantum operator representation for fermions and bosons. The representation extends existing phase-space methods to Fermi systems as well as the important case of Fermi-Bose mixtures. It enables simulations of the dynamics and thermal equilibrium states of many-body quantum systems from first principles. As an example, we numerically calculate finite-temperature correlation functions for the Fermi Hubbard model, with no evidence of the Fermi sign problem. (c) 2005 Elsevier B.V. All rights reserved.

Gaussian phase-space representations for fermions

We introduce a positive phase-space representation for fermions, using the most general possible multimode Gaussian operator basis. The representation generalizes previous bosonic quantum phase-space methods to Fermi systems. We derive equivalences between quantum and stochastic moments, as well as operator correspondences that map quantum operator evolution onto stochastic processes in phase space. The representation thus enables first-principles quantum dynamical or equilibrium calculations in many-body Fermi systems. Potential applications are to strongly interacting and correlated Fermi gases, including coherent behavior in open systems and nanostructures described by master equations. Examples of an ideal gas and the Hubbard model are given, as well as a generic open system, in order to illustrate these ideas.