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Norbert I. Kömle Hui Bing Wen Jie Feng Roman Wawrzaszek Erika S. Hütter Ping He Wojciech Marczewski Borys Dabrowski Kathrin Schröer Tilman Spohn 《Acta Geotechnica》2007,2(2):127-138
A series of thermal conductivity measurements for various materials was performed in a large climate chamber. The size of
the chamber allowed the preparation of relatively large samples in a controlled thermal environment. Three types of thermal
sensors were used: (1) two needle probes; (2) a grid of temperature sensors, evenly distributed inside the sample; (3) two
additional thermal probes, which were simplified versions of an instrument originally developed for measuring thermal properties
of the ice/dust mixture expected to exist at the surface of a comet nucleus. They consist of a series of individual temperature
sensors integrated into a glass fibre rod. Each of these sensors can be operated in an active (heated) or passive (only temperature
sensing) mode. The following sample materials were used: fine-grained reddish sand, coarse-grained moist sand, gravels with
various grain size distributions from < 1 cm up to about 6 cm, and for comparison and calibration pure water (with convection
suppressed by adding agar-agar), compact ice, and compact granite. Of particular interest are the measurements with composite
samples, like stones embedded in an agar-agar matrix. We describe the evaluation methods and present the results of the thermal
conductivity measurements. 相似文献
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A. Smith I. A. Crawford R. A. Gowen A. J. Ball S. J. Barber P. Church A. J. Coates Y. Gao A. D. Griffiths A. Hagermann K. H. Joy A. Phipps W. T. Pike R. Scott S. Sheridan M. Sweeting D. Talboys V. Tong N. Wells J. Biele J. Chela-Flores B. Dabrowski J. Flannagan M. Grande J. Grygorczuk G. Kargl O. B. Khavroshkin G. Klingelhoefer M. Knapmeyer W. Marczewski S. McKenna-Lawlor L. Richter D. A. Rothery K. Seweryn S. Ulamec R. Wawrzaszek M. Wieczorek I. P. Wright M. Sims 《Experimental Astronomy》2009,23(3):711-740
While the surface missions to the Moon of the 1970s achieved a great deal, scientifically much was also left unresolved. The
recent plethora of lunar missions (flown or proposed) reflects a resurgence in interest in the Moon, not only in its own right,
but also as a record of the early solar system including the formation of the Earth. Results from recent orbiter missions
have shown evidence of ice or at least hydrogen within shadowed craters at the lunar poles. 相似文献
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Kömle Norbert I. Kargl Günter Seiferlin Karsten Marczewski Wojiech 《Earth, Moon, and Planets》2002,90(1-4):269-282
Thermal and mechanical properties of cometary ices are closely associated with eachother. Both are largely determined by the
texture (porosity, grain size distribution,grade of sintering) of the material. The surface probe of the Rosetta mission to
comet46P/Wirtanen (Rosetta Lander) will for the first time measure these thermo-mechanical keyparameters in situ, using a hammering device, a drill, and anchors to be shot intothe ground by pyrotechnical means. Several of these components
are associated to theexperiment MUPUS (MUlti-PUrpose-Sensors forsurface and sub-surface science). The development of this instrument has now reached amature state, as the flight model is already delivered and integrated
with thespacecraft. We describe the main aspects of the experiment, outline the evaluationmethods, and show representative
results from test measurements. 相似文献
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