Apollo gastrointestinal analysis

Fecal bile acid patterns for the Apollo 17 flight were studied to determine the cause of diarrhea on the mission. The fecal sterol analysis gave no indication of an infectious diarrhea, or specific, or nonspecific etiology occurring during the entire flight. It is assumed that the gastrointestinal problems encountered are the consequences of altered physiology, perhaps secondary to physical or emotional stress of flight

Electron-Phonon Interactions in C28_{28}-derived Molecular Solids

We present {\it ab initio} density-functional calculations of molecular solids formed from C$_{28}$-derived closed-shell fullerenes. Solid C$_{28}$H$_4$ is found to bind weakly and exhibits many of the electronic structure features of solid C$_{60}$ with an enhanced electron-phonon interaction potential. We show that chemical doping of this structure is feasible, albeit more restrictive than its C$_{60}$ counterpart, with an estimated superconducting transition temperature exceeding those of the alkali-doped C$_{60}$ solids.Comment: Lower quality postscript file for Figure 1 is used in the manuscript in order to meet submission quota for pre-print server. Higher quality postscript file available from author: [email protected] This article has been updated to reflect changes incorporated during the peer review process. It is published in PRB 70, 140504(R) 200

Structural Aspects of Traditional Cretan Masonry

Glowacki, K.T., J. M. Nichols, and N. L. Holland. “Structural Aspects of Traditional Cretan Masonry.” In Proceedings of the 15th International Brick and Block Masonry Conference, Florianópolis, Brazil, June 3–6, 2012, edited by Humberto Ramos Roman and Guilherme Aris Parsekian, CD-ROM, Paper No. 1C4. Florianopolis, Brazil: 15 IBMAC. ISBN: 9788563273109. (DOI: 10.13140/RG.2.1.1304.2728).The island of Crete has a long tradition of stone masonry construction, beginning over 8000 years before present. As noted by architectural historians, the vernacular architecture of modern (pre-World War II) villages on Crete has many close parallels with house remains uncovered in the archaeological record of the Minoan Bronze Age (ca. 3000-1050 BCE). Archaeologists have used modern ethnographic comparisons effectively to shed light upon issues ranging from the interpretation of ancient house plans to a better understanding of construction techniques, the use of local resources, and the effects of abandonment processes on the built environment. A full-scale replica of a typical Cretan house from the 12th-11th century BCE (Late Minoan IIIC period) is planned for construction in College Station. The first stage of the building will comprise a single room, ca. 6.20 m by 5.20 m, constructed of stacked limestone with minimal earth mortar, timber ceiling beams and laths, a layer of brush, and topped with a flat clay overlay. The purpose of this paper is to outline the design and structural analysis of the building, and to discuss issues related to construction processes, climate, and ventilation that may apply to both archaeological/historical and modern contexts. Modern interest in this traditional type of building technique stems from the use of limestone blocks in construction, and the potential it has to be a key element of the greening of building construction practices. This study forms one element of a major study of limestone and its uses

Origin of electron cyclotron maser-induced radio emissions at ultra-cool dwarfs: magnetosphere-ionosphere coupling currents

A number of ultra-cool dwarfs emit circularly polarised radio waves generated by the electron cyclotron maser instability. In the solar system such radio is emitted from regions of strong auroral magnetic field-aligned currents. We thus apply ideas developed for Jupiter's magnetosphere, being a well-studied rotationally-dominated analogue in our solar system, to the case of fast-rotating UCDs. We explain the properties of the radio emission from UCDs by showing that it would arise from the electric currents resulting from an angular velocity shear in the fast-rotating magnetic field and plasma, i.e. by an extremely powerful analogue of the process which causes Jupiter's auroras. Such a velocity gradient indicates that these bodies interact significantly with their space environment, resulting in intense auroral emissions. These results strongly suggest that auroras occur on bodies outside our solar system.Comment: Accepted for publication in the Astrophysical Journa

Developing Well Adapted Early to Midseason Cultivars of Trifoiloum subterraneum ssp. Brachycalycinum

Development and selection of early to midseason cultivars of subterranean clover (Trifolium subterraneum L.) ssp. brachycalycinum has mostly involved the use of early generation selection nursery swards (F2-progeny method). Four sites were sown in the mid-North region of South Australia. At the end of 1995, the top 20 lines from each site had burrs (seed pods) sampled at random. The burr will proceed into the final early generation selection phase (1 - 2 years). Dependent on the site, many lines have out-performed the standard checkplot cultivar, Clare. High hardseed levels have also been incorporated into 1989 crossbreds

Brayton-cycle radioisotope heat source design study. Phase I - /Conceptual design/ report

Conceptual designs for radioisotope heat source systems to provide 25 kW thermal power to Brayton cycle power conversion system for space application

Post-Newtonian Approximation in Maxwell-Like Form

The equations of the linearized first post-Newtonian approximation to general relativity are often written in "gravitoelectromagnetic" Maxwell-like form, since that facilitates physical intuition. Damour, Soffel and Xu (DSX) (as a side issue in their complex but elegant papers on relativistic celestial mechanics) have expressed the first post-Newtonian approximation, including all nonlinearities, in Maxwell-like form. This paper summarizes that DSX Maxwell-like formalism (which is not easily extracted from their celestial mechanics papers), and then extends it to include the post-Newtonian (Landau-Lifshitz-based) gravitational momentum density, momentum flux (i.e. gravitational stress tensor) and law of momentum conservation in Maxwell-like form. The authors and their colleagues have found these Maxwell-like momentum tools useful for developing physical intuition into numerical-relativity simulations of compact binaries with spin.Comment: v4: Revised for resubmission to Phys Rev D, 6 pages. v3: Reformulated in terms of DSX papers. Submitted to Phys Rev D, 6 pages. v2: Added references. Changed definitions & convention