Investigating Clusters of Galaxies with Planck and Herschel     

Martin Giard  Ludovic Montier 《Astrophysics and Space Science》2004,290(1-2):159-166

With the Planck and Herschel satellite missions of the European Space Agency, the far-infrared and submillimeter window will offer new investigation tools toward clusters of galaxies in the distant Universe. These are the Sunyaev Zel'dovich (SZ) effect of the cosmic microwave background and the thermal emission of dust grains. The power of the SZ effect is such that Planckis expected to discover thousands of new clusters at redshifts larger than 0.2, where only a few tens are known today. The dust can be present at large scale in the intracluster medium, and we show that even at very low abundances it is able to be a major cooling agent for the whole cluster. However the dominating dust emission will be that of the background infrared star forming galaxies. In all cases, the data processing of space borne sensitive submillimeter observations of clusters of galaxies such as the one that Planck and Herschel will provide, will require a very carefull combined analysis of the SZ effect and dust thermal emission.  相似文献   

Rocking buoy wave energy converter     

Robert E. Salomon 《Ocean Engineering》1989,16(3)

A device for converting ocean wave energy into electricity utilizing a rocking buoy and a hydrogen pressure cell is described. The moored buoy contains a pneumatic tube filled with a dense liquid which rocks back and forth as a result of the ocean wave activity. Hydrogen gas, maintained above the dense fluid is alternatively compressed and expanded by the moving fluid. The hydrogen gas communicates with a hydrogen pressure cell and the resulting pressure difference across the cell leads to an electrical voltage and under load, to electrical power.  相似文献   

Separation of intrinsic absorption and scattering attenuation from Lg coda decay in central France using acoustic radiative transfer theory   总被引：3，自引：0，他引：3  

Céline Lacombe  Michel Campillo  Anne Paul  Ludovic Margerin 《Geophysical Journal International》2003,154(2):417-425

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Development of a rain‐on‐snow detection algorithm using passive microwave radiometry          下载免费PDF全文

Caroline Dolant  Alexandre Langlois  Benoit Montpetit  Ludovic Brucker  Alexandre Roy  Alain Royer 《水文研究》2016,30(18):3184-3196

Currently observed climate warming in the Arctic has numerous consequences. Of particular relevance, the precipitation regime is modified where mixed and liquid precipitation can occur during the winter season leading to rain‐on‐snow (ROS) events. This phenomenon is responsible for ice crust formation, which has a significant impact on ecosystems (such as biological, hydrological, ecological and physical processes). The spatially and temporally sporadic nature of ROS events makes the phenomenon difficult to monitor using meteorological observations. This paper focuses on the detection of ROS events using passive microwave (PMW) data from a modified brightness temperature (T_B) gradient approach at 19 and 37 GHz. The approach presented here was developed empirically for observed ROS events with coincident ground‐based PMW measurements in Sherbrooke, Quebec, Canada. It was then tested in Nunavik, Quebec, with the Advanced Microwave Scanning Radiometer for the Earth Observing System (AMSR‐E). We obtained a detection accuracy of 57, 71 and 89% for ROS detection for three AMSR‐E grid cells with a maximum error of 7% when considering all omissions and commissions with regard to the total number of AMSR‐E passes throughout the winter period. Copyright © 2016 John Wiley & Sons, Ltd.  相似文献   

Shocked quartz in polymict impact breccia from the Upper Cretaceous Yallalie impact structure in Western Australia     

Morgan A. Cox  Aaron J. Cavosie  Ludovic Ferrire  Nicholas E. Timms  Phil A. Bland  Katarina Miljkovi&#x;  Timmons M. Erickson  Brian Hess 《Meteoritics & planetary science》2019,54(3):621-637

Yallalie is a ~12 km diameter circular structure located ~200 km north of Perth, Australia. Previous studies have proposed that the buried structure is a complex impact crater based on geophysical data. Allochthonous breccia exposed near the structure has previously been interpreted as proximal impact ejecta; however, no diagnostic indicators of shock metamorphism have been found. Here we report multiple (27) shocked quartz grains containing planar fractures (PFs) and planar deformation features (PDFs) in the breccia. The PFs occur in up to five sets per grain, while the PDFs occur in up to four sets per grain. Universal stage measurements of all 27 shocked quartz grains confirms that the planar microstructures occur in known crystallographic orientations in quartz corresponding to shock compression from 5 to 20 GPa. Proximity to the buried structure (~4 km) and occurrence of shocked quartz indicates that the breccia represents either primary or reworked ejecta. Ejecta distribution simulated using iSALE hydrocode predicts the same distribution of shock levels at the site as those found in the breccia, which supports a primary ejecta interpretation, although local reworking cannot be excluded. The Yallalie impact event is stratigraphically constrained to have occurred in the interval from 89.8 to 83.6 Ma based on the occurrence of Coniacian clasts in the breccia and undisturbed overlying Santonian to Campanian sedimentary rocks. Yallalie is thus the first confirmed Upper Cretaceous impact structure in Australia.  相似文献   

Should Bouchet's hypothesis be taken into account in rainfall‐runoff modelling? An assessment over 308 catchments     

Ludovic Oudin  Claude Michel  Vazken Andrassian  Franois Anctil  Ccile Loumagne 《水文研究》2005,19(20):4093-4106

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A new measure for cosmic shear     

Peter Schneider  Ludovic van Waerbeke  Bhuvnesh Jain  & Guido Kruse 《Monthly notices of the Royal Astronomical Society》1998,296(4):873-892

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On the occurrence and origin of anthropogenic radionuclides found in a fragment of the Chelyabinsk (LL5) meteorite          下载免费PDF全文

Rebecca Querfeld  Mohammad R. Tanha  Lars Heyer  Franz Renz  Georg Guggenberger  Franz Brandstätter  Ludovic Ferrière  Christian Koeberl  Georg Steinhauser 《Meteoritics & planetary science》2017,52(6):1244-1250

A piece of the 2013 Chelyabinsk meteorite was investigated for its content of anthropogenic radionuclides. In addition to traces of cesium‐137 that had been previously reported for this particular fragment, we found an unusually high amount of strontium‐90, which indicates that the source of this contamination was the Kyshtym accident (1957). A high Sr‐90/Cs‐137 activity ratio is characteristic for Kyshtym‐derived contaminations. Based on the cesium‐137 content in the soil from the finding site, it is estimated that the fragment was contaminated with soil particles in the milligram range upon impact. Investigation of the soil revealed very unusual ferromagnetic characteristics and an iron‐rich chemical composition. Mössbauer spectroscopy indicated the presence of steel components in this soil, suggesting that the investigated meteorite fragment was found in an industrial dumping site rather than natural soil.  相似文献   

Bemerkungen zu dem Aufsatz „Breecie oder Bresche?“ von P.Wagner     

W. Salomon 《International Journal of Earth Sciences》1928,19(6):499-499

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Bücher- und Zeitschriftenschau     

Otto Wilckens  Wilckens  Leuchs  Rudolf Leutelt  W. Salomon 《International Journal of Earth Sciences》1930,21(3):201-205

Ohne Zusammenfassung  相似文献