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  • SPACE BIOLOGY  (13)
  • BIOTECHNOLOGY  (5)
  • Exobiology  (3)
  • Superfluidity and superconductivity  (2)
  • 1
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    Vortex creep down to 0.3 K in superconducting Fe(Te,Se) single crystals (2014)
    American Physical Society (APS)
    Details
    Publikationsdatum: 2014-01-30
    Beschreibung: Author(s): T. Klein, H. Grasland, H. Cercellier, P. Toulemonde, and C. Marcenat We report on a study of the vortex creep in Fe1+δ(TexSe1−x) single crystals (x=0.5 and 0.4) down to 0.28 K (∼Tc/50) and up to μ0Ha=2T. The relaxation of the current density [J(t)] has been measured during 20 hours and the decay of J(t) can be well described by a J(t)∝[ln(t/t0)]−1/μ law. We show that... [Phys. Rev. B 89, 014514] Published Wed Jan 29, 2014
    Schlagwort(e): Superfluidity and superconductivity
    Print ISSN: 1098-0121
    Digitale ISSN: 1095-3795
    Thema: Physik
    Publiziert von American Physical Society (APS)
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
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    Thickness dependence of the superconducting critical temperature in heavily doped Si:B epilayers (2013)
    American Physical Society (APS)
    Details
    Publikationsdatum: 2013-08-13
    Beschreibung: Author(s): A. Grockowiak, T. Klein, H. Cercellier, F. Lévy-Bertrand, X. Blase, J. Kačmarčik, T. Kociniewski, F. Chiodi, D. Débarre, G. Prudon, C. Dubois, and C. Marcenat We report on the superconducting properties of a series of heavily doped Si:B epilayers grown by gas immersion laser doping with boron content ( n B ) ranging from ∼3×10 20 cm −3 to ∼6×10 21 cm −3 and thickness ( d ) varying between ∼20 nm and ∼210 nm. We show that superconductivity is only observed for n B va... [Phys. Rev. B 88, 064508] Published Mon Aug 12, 2013
    Schlagwort(e): Superfluidity and superconductivity
    Print ISSN: 1098-0121
    Digitale ISSN: 1095-3795
    Thema: Physik
    Publiziert von American Physical Society (APS)
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
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    On the search for extant life on Mars (1996)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-24
    Beschreibung: Proposals for continuing the search for extant life on Mars are primarily predicated on the assumption that specialized environmental niches that could support a biota may exist on the planet. Before attempting any critical tests for extant organisms, either in situ or on returned samples, it is imperative to determine whether any such sites actually exist. If, through remote sensing and landed instrumentation, sites of potential biological interest are discovered and characterized, biological tests can then more effectively be planned to elicit the presence of organisms that are adapted to living in these particular environments.
    Schlagwort(e): Exobiology
    Materialart: Icarus (ISSN 0019-1035); Volume 120; 431-6
    Format: text
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  • 4
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    Biological experiments - The Viking Mars Lander. (1972)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Beschreibung: From the biological point of view, the Viking 1975 mission might be regarded as a test of the Oparin-Haldane hypothesis concerning the chemical evolution of living systems. Mars is a planet whose early history was probably similar to that of the earth and whose present environmental conditions may be compatible with the maintenance of living organisms. Thus, the biological experiments aboard the Viking I spacecraft are primarily concerned with the question of whether chemical evolution on Mars took place, and, if so, whether the process reached a level of complexity characteristic of replicating systems.
    Schlagwort(e): BIOTECHNOLOGY
    Materialart: Icarus; 16; Feb. 197
    Format: text
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  • 5
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    The Viking biological investigation - General aspects (1977)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: The Viking biological investigation has tested four different hypotheses regarding the possible nature of Martian organisms. While significant results were obtained for each of these, tests of three of the hypotheses appear to indicate the absence of biology in the samples used, while the fourth is consistent with a biological interpretation. The original assumptions for each experiment and the experimental procedures that were utilized to test these assumptions are reviewed.
    Schlagwort(e): SPACE BIOLOGY
    Materialart: Journal of Geophysical Research; 82; Sept. 30
    Format: text
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  • 6
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    The Viking biological experiments on Mars (1978)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-17
    Beschreibung: The three biological experiments on board the Viking Mars Landers are discussed. The gas exchange experiment provided periodic measurements of the composition and quantity of gases from Martian surface material, either in a humid or a wet nutrient sampling mode. The labeled release experiment demonstrated that adding an aqueous solution of dilute radioactive compounds to Martian material caused a rapid release of labeled gas. The results of the pyrolytic release experiment remain difficult to interpret. Data from the first two experiments suggest that oxidants (including H2O2 and iron oxide) rather than biota may account for all the observed reactions.
    Schlagwort(e): SPACE BIOLOGY
    Materialart: Icarus; 34; June 197
    Format: text
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  • 7
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    General constraints on the Viking biology investigation (1976)
    In:  Other Sources
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    Publikationsdatum: 2011-08-17
    Beschreibung: The paper discusses some of the constraints pertaining to the Viking mission for detection of life on Mars, within which the Viking experiments were conceived, designed, and developed. The most important limitation to the entire study is the complete information about the nature of Mars, such as the chemical composition of the surface material of Mars and the exact identification of the constituents of that planet. Ways in which celestial mechanics places severe limitations on the Viking biology investigation are discussed. Major engineering constraints are examined relative to the accomodation of biology instrument inside the Viking lander and to the design of the instrument itself. Other constraints discussed concern the operational aspects of the mission and the testing program.
    Schlagwort(e): SPACE BIOLOGY
    Materialart: Origins of Life; 7; Aug. 197
    Format: text
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  • 8
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    The Viking mission search for life on Mars (1976)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Beschreibung: The scientific payload on the Viking Mars landers is described. Shortly after landing, two facsimile cameras capable of stereoscopic imaging will scan the landing site area in black and white, color, and infrared to reveal gross evidence of past or present living systems. A wide range mass spectrometer will record a complete mass spectrum for soil samples from mass 12 to mass 200 every 10.3 sec. Three experiments based on different assumptions on the nature of life on Mars, if it exists, will be carried out by the bio-lab. A pyrolytic release experiment is designed to measure photosynthetic or dark fixation of carbon dioxide or carbon monoxide into organic compounds. A labelled release experiment will test for metabolic activity during incubation of a surface sample moistened with a solution of radioactively labelled simple organic compounds. A gas exchange experiment will detect changes in the gaseous medium surrounding a soil sample as the result of metabolic activity. The hardware, function, and terrestrial test results of the bio-lab experiments are discussed.
    Schlagwort(e): SPACE BIOLOGY
    Materialart: Nature; 262; July 1
    Format: text
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  • 9
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    Simulation of the Viking biology experiments - An overview (1979)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-17
    Beschreibung: In the present paper, ground-based investigations of the Viking Martian biology data, which have resulted in reasonable simulations of these data, are reviewed. These simulations, which in strong oxidants, UV-treated materials, iron-containing clays, or iron salts were used as Martian analogs, are capable of explaining the ambiguity between the GCMS (gas-chromatography mass-spectrometry) experiments, in which no organic compounds were found on Mars, and the Labeled Release experiments, in which added organics were decomposed.
    Schlagwort(e): SPACE BIOLOGY
    Materialart: Journal of Molecular Evolution; 14; Dec. 197
    Format: text
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  • 10
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    The Viking biological investigations - Review and status (1978)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-17
    Beschreibung: The three experimental approaches incorporated into the Viking biology instrument have yielded results that are most readily explained as nonbiological phenomena. The predominant view among investigators trying to simulate the Mars results is that the surface material of Mars contains strongly oxidizing compounds which would account for many of the more intense reactions seen on Mars. Other mechanisms are also currently being proposed and studied.
    Schlagwort(e): SPACE BIOLOGY
    Materialart: Origins of Life; 9; Dec. 197
    Format: text
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