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101.
Ralf Srama Thomas Stephan Eberhard Grün Norbert Pailer Anton Kearsley Amara Graps Rene Laufer Pascale Ehrenfreund Nicolas Altobelli Kathrin Altwegg Siegfried Auer Jack Baggaley Mark J. Burchell James Carpenter Luigi Colangeli Francesca Esposito Simon F. Green Hartmut Henkel Mihaly Horanyi Annette Jäckel Sascha Kempf Neil McBride Georg Moragas-Klostermeyer Harald Krüger Pasquale Palumbo Andre Srowig Mario Trieloff Peter Tsou Zoltan Sternovsky Oliver Zeile Hans-Peter Röser 《Experimental Astronomy》2009,23(1):303-328
The scientific community has expressed strong interest to re-fly Stardust-like missions with improved instrumentation. We
propose a new mission concept, SARIM, that collects interstellar and interplanetary dust particles and returns them to Earth.
SARIM is optimised for the collection and discrimination of interstellar dust grains. Improved active dust collectors on-board
allow us to perform in-situ determination of individual dust impacts and their impact location. This will provide important
constraints for subsequent laboratory analysis.
The SARIM spacecraft will be placed at the L2 libration point of the Sun–Earth system, outside the Earth’s debris belts and
inside the solar-wind charging environment. SARIM is three-axes stabilised and collects interstellar grains between July and
October when the relative encounter speeds with interstellar dust grains are lowest (4 to 20 km/s). During a 3-year dust collection
period several hundred interstellar and several thousand interplanetary grains will be collected by a total sensitive area
of 1 m2. At the end of the collection phase seven collector modules are stored and sealed in a MIRKA-type sample return capsule.
SARIM will return the capsule containing the stardust to Earth to allow for an extraction and investigation of interstellar
samples by latest laboratory technologies. 相似文献
102.
Löbens Stefan Oriolo Sebastián Benowitz Jeff Wemmer Klaus Layer Paul Siegesmund Siegfried 《International Journal of Earth Sciences》2017,106(6):1991-2003
International Journal of Earth Sciences - Systematic 40Ar/39Ar feldspar data obtained from the Sierras Pampeanas are presented, filling the gap between available high-... 相似文献
103.
Time constraints on the tectonic evolution of the Eastern Sierras Pampeanas (Central Argentina) 总被引:1,自引:0,他引:1
Siegfried Siegesmund Andre Steenken Roberto D. Martino Klaus Wemmer Mónica G. López de Luchi Robert Frei Sergej Presnyakov Alina Guereschi 《International Journal of Earth Sciences》2010,99(6):1199-1226
The application of the SHRIMP U/Pb dating technique to zircon and monazite of different rock types of the Sierras de Córdoba
provides an important insight into the metamorphic history of the basement domains. Additional constraints on the Pampean
metamorphic episode were gained by Pb/Pb stepwise leaching (PbSL) experiments on two titanite and garnet separates. Results
indicate that the metamorphic history recorded by Crd-free gneisses (M2) started in the latest Neoproterozoic/earliest Cambrian
(553 and 543 Ma) followed by the M4 metamorphism at ~530 Ma that is documented in the diatexites. Zircon ages of 492 Ma in
the San Carlos Massif correlate partly with rather low Th/U ratios (<0.1) suggesting their growth by metamorphic fluids. This
age is even younger than the PbSL titanite ages of 506 Ma. It is suggested that the fluid alteration relates to the beginning
of the Famatinien metamorphic cycle in the neighbouring Sierra de San Luis and has not affected the titanite ages. The PTt
evolution can be correlated with the plate tectonic processes responsible for the formation of the Pampean orogene, i.e.,
the accretion of the Pampean basement to the Río de La Plata craton (M2) and the later collision of the Western Pampean basement
with the Pampean basement. 相似文献
104.
Myong-In Lee Ildae Choi Wei-Kuo Tao Siegfried D. Schubert In-Sik Kang 《Climate Dynamics》2010,34(2-3):419-437
The mechanisms of summertime diurnal precipitation in the US Great Plains were examined with the two-dimensional (2D) Goddard Cumulus Ensemble (GCE) cloud-resolving model (CRM). The model was constrained by the observed large-scale background state and surface flux derived from the Department of Energy (DOE) Atmospheric Radiation Measurement (ARM) Program’s Intensive Observing Period (IOP) data at the Southern Great Plains (SGP). The model, when continuously-forced by realistic surface flux and large-scale advection, simulates reasonably well the temporal evolution of the observed rainfall episodes, particularly for the strongly forced precipitation events. However, the model exhibits a deficiency for the weakly forced events driven by diurnal convection. Additional tests were run with the GCE model in order to discriminate between the mechanisms that determine daytime and nighttime convection. In these tests, the model was constrained with the same repeating diurnal variation in the large-scale advection and/or surface flux. The results indicate that it is primarily the surface heat and moisture flux that is responsible for the development of deep convection in the afternoon, whereas the large-scale upward motion and associated moisture advection play an important role in preconditioning nocturnal convection. In the nighttime, high clouds are continuously built up through their interaction and feedback with long-wave radiation, eventually initiating deep convection from the boundary layer. Without these upper-level destabilization processes, the model tends to produce only daytime convection in response to boundary layer heating. This study suggests that the correct simulation of the diurnal variation in precipitation requires that the free-atmospheric destabilization mechanisms resolved in the CRM simulation must be adequately parameterized in current general circulation models (GCMs) many of which are overly sensitive to the parameterized boundary layer heating. 相似文献
105.
Siegfried Bressau 《International Journal of Earth Sciences》1955,43(2):426-427
Ohne ZusammenfassungEine ausführliche Darstellung erscheint in Die Küste, Bd. 3, 1955. 相似文献
106.
Klaus Ullemeyer Siegfried Siegesmund Patrick N.J. Rasolofosaon Jan H. Behrmann 《Tectonophysics》2006,414(1-4):97
A representative suite of deformed, metamorphic rocks from the TRANSALP reflection seismic traverse in the Eastern Alps was studied in the laboratory with respect to elastic properties and whole-rock texture. Compressional wave (P-wave) velocities and their anisotropies were measured at various experimental conditions (dry, wet, confining pressure), and compared to the texture-related component of anisotropy. Here ‘texture’ refers to crystallographic preferred orientations (CPOs), which were determined by neutron texture goniometry. In gneisses and schists P-wave anisotropies are mainly controlled by the microcrack fabric. In marbles and amphibolites CPO contributes very significantly to anisotropy. At 200 MPa confining pressure the degree of anisotropy is between 5% and 15%, depending on rock composition and/or CPO intensity. Special emphasis was also put on discussing possible effects of fluids on seismic velocity and anisotropy. Distributions of water-filled microcracks and pores are distinctly anisotropic, with maximum contribution to bulk rock velocity mostly parallel to the foliation pole. Decreasing P-wave velocity and increasing anisotropy of immersed samples may be explained by crack-induced changes of the elastic moduli of bulk rock. The main conclusion regarding interpretation of TRANSALP data is that strong reflections in the deep Alpine crust are probably due to marble–gneiss and metabasite–gneiss contacts, although P-wave anisotropy and boundaries between zones of ‘dry’ or ‘wet’ series may contribute to reflectivity to some extent. 相似文献
107.
Special issue on salt decay 总被引:1,自引:0,他引:1
108.
109.
The otoliths of 200 postlarval spot (Leiostomus xanthurus) were marked by immersing the fish for 24 hr in a solution of 0.4 g tetracycline HCl l?1 of salt water (15 ‰). The resulting time-mark could later be identified under ultraviolet (UV) light with an epifluorescence microscope. Spot were held in the laboratory or in the field for up to 30 d. Two validation methods were employed to document daily increment formation. The total number of increments per otolith, or the number of increments formed after the time-mark, were regressed against days held in an experiment. The hypothesis of one increment per day would result in a regression coefficient not significantly different from 1.0. In the field both the total count method (b=1.05) and the time-mark method (b=0.90) supported a one-increment-per-day hypothesis and were not significantly different from each other (p>0.05). In the laboratory the total count method (b=0.56) and the time-mark method (b=0.36) were significantly different from 1.0 (p<0.05), and thus did not support the one-increment-per-day hypothesis. Failure to resolve a one-increment-per-day deposition rate in the laboratory was primarily attributed to food limitation in the experiments. 相似文献
110.
Dr. Karsten Berg Dr. Christoph Breitkreuz Dr. Klaus -Werner Damm Siegfried Pichowiak Prof. Dr. Werner Zeil 《International Journal of Earth Sciences》1983,72(2):715-731
Analysis of extended plutons in the Coast Range of North Chile between 25°30′ and 26°35′ led to the recognition of a complex magmatic and structural evolution from the Upper Paleozoic to the Tertiary. The ascension of the intrusive bodies is dictated by deep-seated block tectonics. Generally the chemistry changes from S-type magmas in the Paleozoic to I-type magmas in the Mesozoic and Cainozoic. This is accompanied by a change in the structural geology of the continental margin which we present in six hypothetic phases (Devonian-Tertiary). We are only at the beginning of an encompassing synthesis of the genesis of the Andean orogen. 相似文献