Geophysical surveys
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Association Between Extraterrestrial Phenomena And Weather Changes In The Northern Hemisphere In Winter
Geophysical surveys - Tập 23 - Trang 303-333 - 2002
This paper includes a discussion of the validity of theobjections which are usuallyraised against the physical plausibility of the correlationsbetween extraterrestrialphenomena and changes in circulation in the lower atmosphere.The behaviour of the winterlower troposphere in the Northern Hemisphere was analysed bothon a month-to-month timescale and on a day-to-day time scale. The mechanisms which ...... hiện toàn bộ
A critical review of the case for, and against, extraterrestrial impact at the K/T boundary
Geophysical surveys - Tập 11 - Trang 55-131 - 1990
The discovery of an excess of Ir and other noble metals in approximately chondritic proportions at numerous sites, synchronous with the Cretaceous/Tertiary (K/T) boundary, provided hard evidence for earlier suggestion that extraterrestrial envents may have coincided with many global geologic boundaries. Further support for the impact hypothesis arose from the identification of abundant microspheru...... hiện toàn bộ
Unified Approach to Photon-Counting Microlaser Rangers, Transponders, and Altimeters
Geophysical surveys - - 2001
Unlike current manned systems, NASA's next generation SLR2000 Satellite Laser Ranging (SLR) station is fully autonomous, eye-safe, relatively compact and inexpensive, and, during daytime tracking, operates at signal-to-noise ratios several orders of magnitude below unity. Tiny, passivelyQ-switched microlasers generate ultra-short pulses with output energies on the order of 100 μJ at few kHz rates ...... hiện toàn bộ
SI, the international system of units
Geophysical surveys - Tập 1 - Trang 217-241 - 1973
Two types of systems of units have been formed. The commercial is a system of weights and measures, such as the metric, defined by civil law. The scientific is a system of physical units generated through use of scientific laws which link corresponding quantities. The International System of units, denoted SI, was established in 1960 by the General Conference of Weights and Measures. The set of SI...... hiện toàn bộ
Modelling Snow Slab Release Using a Temperature-Dependent Viscoelastic Finite Element Model with Weak Layers
Geophysical surveys - Tập 24 - Trang 417-430 - 2003
A two-dimensional thermo-mechanicalplane-strain finite element model forsnow is presented. Snow is modeled asa two component porous medium consisting ofa solid ice matrix and interstitial pore air.The ice and air phases are not always in thermalequilibrium. Therefore, heat transport is governedby two non-stationary energy conservation equationswhich are coupled by free convection heat exchangesat ...... hiện toàn bộ
Avalanche mapping and related G.I.S. applications in the Catalan Pyrenees
Geophysical surveys - Tập 16 Số 5-6 - Trang 681-693 - 1995
Modeling in paleoceanography
Geophysical surveys - Tập 8 - Trang 1-23 - 1986
The two last decades of research in paleoceanography are characterized by extensive data collection and by the development of numerous hypotheses based on these data. Both the nature of the thermohaline circulation and the nature of the surface circulation during past times are currently being debated. Physical models of the ocean circulation are beginning to play an important role in these debate...... hiện toàn bộ
Numerical and Physical Modelling of the Effect of a Dam on Powder Avalanche Motion: Comparison with Previous Approaches
Geophysical surveys - Tập 24 - Trang 479-498 - 2003
As part of the European project CADZIE, the interactionbetween powder avalanches and dams has been studied. First, we simulated a powder avalancheusing a heavy salt solution in a water tank. These experiments showed that (1) the ratio betweenthe maximum velocity parallel to the slope and the front velocity is greater than 1 (up to 1.5),and that (2) the velocity normal to the slope can rise to 74% ...... hiện toàn bộ
Cluster Observes the High-Altitude CUSP Region
Geophysical surveys - Tập 26 Số 1-3 - Trang 135-175 - 2005
Tổng số: 997
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