Eine Kartierung der Bewegungsspuren im obersten Höllental (Schwarzwald)     

Hermann Freudenberg 《International Journal of Earth Sciences》1940,31(3-4):285-293

Ohne Zusammenfassung  相似文献   

Junge Vulkano-Plutone in Südwestafrika     

Hermann Korn  Henno Martin 《International Journal of Earth Sciences》1939,30(6):631-636

Ohne Zusammenfassung  相似文献   

Können Eisensäuerlinge die Genese der Lahn-Dill-Erze erklären?     

Hermann Harder 《Contributions to Mineralogy and Petrology》1964,9(5):379-422

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Marine Minerals in the Mexican Pacific: Toward Efficient Resource Management     

L. W. Daessl  D. W. Fischer 《Marine Georesources & Geotechnology》2001,19(3):197-206

Vast reserves of marine minerals are known to occur within the Mexican Exclusive Economic Zone. These reserves include: (1) heavy mineral placers rich in titanium and iron along the coast of San Antonio del Mar, Baja California and the southern States of Oaxaca and Guerrero; (2) phosphorites, which represent the only source for superphosphate fertilizers along the Pacific coast off the Baja California peninsula and the Gulf of Tehuantepec; and (3) manganese oxide deposits in nodule and crusts located adjacent to the Clarion-Clipperton Zone and containing high concentrations of Cu + Ni + Co (up to 1.9%), which are essential for the steel and super-alloy industries. Few but important efforts toward surveying these deposits have been carried out by Mexican and international researchers. Relevant data generated by these investigations are reviewed here and put together in a single document. Adequate knowledge of Mexican mineral resources is essential for the development of management strategies when offshore mining starts during this century. Thus, the review discusses the economics inherent to ocean mining in Mexico, setting baselines for future exploration and development activities in the Mexican Exclusive Economic Zone.  相似文献   

Public climate-change skepticism,energy preferences and political participation     

Anita Engels  Otto Hüther  Mike Schäfer  Hermann Held 《Global Environmental Change》2013,23(5):1018-1027

Many studies have shown a general decline of public concern about climate change or vice versa a rise in public climate-change skepticism, in particular in the U.S. and other Anglo-Saxon countries. There is a vivid debate on whether this is a global phenomenon, on which factors explain the decline, and on the broader societal implications of these trends in the context of the transformation toward a low-carbon society. We add to this literature by presenting the results of a recent general population survey in Germany in which we looked for systematic linkages between public climate-change skepticism on one hand, and energy preferences and political participation on the other. Germany is an interesting testbed as it is currently involved in a large-scale restructuring of its system of energy supply toward renewable energy sources (the “Energiewende”). Our results indicate that climate-change skepticism has not diffused widely in Germany, but that it correlates with less support of renewable energy sources. However, skepticism correlates negatively with political participation, and there is no strong political outlet for public climate-change skepticism in Germany. Alternative potential barriers for the successful implementation of the “Energiewende” are also discussed.  相似文献   

A Custom Chip Set for a Frequency-Agile High-Resolution Sonar Array     

Fischer  G. Davis  A.J. Kasturi  P. 《Oceanic Engineering, IEEE Journal of》2007,32(2):416-427

This paper describes two custom-integrated circuits, which form the core building blocks of a versatile wideband sonar array. An analog 0.5-mum complementary metal-oxide-semiconductor (CMOS) chip houses a preamplifier, an antialias filter, and a high-resolution (14-16 b) data converter based on delta-sigma modulation techniques. A complementary 0.35-mum digital CMOS chip incorporates a four-stage multirate filter cascade, which provides a wideband and two narrowband outputs. The complex narrowband outputs are obtained via a subsampling mixer and span over the top 15% or the top 10%, respectively, of the original band. The system sampling clock can vary from 2 to 10 MHz to enable tuning to a specific frequency window located anywhere between 30 and 150 kHz. Both chips process four sonar channels in parallel and, when clocked at 10 MHz, dissipate a combined power of 416 mW (104 mW per channel).  相似文献   

Ice thawing,mountains falling—are alpine rock slope failures increasing?     

C. Huggel  S. Allen  P. Deline  L. Fischer  J. Noetzli  L. Ravanel 《Geology Today》2012,28(3):98-104

Many high‐mountain environments of the world have seen dramatic changes in the past years and decades. Glaciers are retreating and downwasting, often at a dramatically fast pace, leaving large amounts of potentially unstable debris, moraines and rock slopes behind. Although in the main invisible to the eye of an observer, permafrost, i.e. rock and debris with permanent zero or subzero temperatures, is thawing. Several slopes have become unstable and landslides potentially related to permafrost degradation have received wide‐ranging attention from both scientists and the media. A number of those landslides can be related to the effects of recent changes in the cryosphere, which are ultimately driven by changes in climatic parameters, in particular temperature and precipitation.  相似文献   

Doing community geography     

Fischer  Heather  Block  Daniel  Bosse  Amber  Hawthorne  Timothy L.  Jung  Jin-Kyu  Pearsall  Hamil  Rees  Amanda  Shannon  Jerry 《GeoJournal》2021,87(2):293-306

Community Geography offers researchers, community groups, and students opportunities to engage in action oriented applied geographical research. Creating and sustaining these research programs can be challenging, programs can involve many partners from both academic and the community, have different goals and purposes, and utilize a variety of methods to perform research. In this paper we offer a framework of three primary overarching principles for implementing CG projects; (1) Who, (2) Why, and (3) How. (1) “Who” describes who is involved in CG, including researchers, community partners, academic institutions, (2) “Why” describes the justifications and benefits of taking this approach. (3) “How” explains how CG borrows methodologies from many disciplines within geography and beyond. Our examples are not exhaustive; rather, they serve as starting points to inspire researchers interested in CG.

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Population dynamics and natural hazard risk management: conceptual and practical linkages for the case of Austrian policy making     

Clar  Christoph  Löschner  Lukas  Nordbeck  Ralf  Fischer  Tatjana  Thaler  Thomas 《Natural Hazards》2021,105(2):1765-1796

Natural Hazards - This contribution explores the conceptual and empirical linkages between population dynamics and natural hazard risk management (NHRM). Following a review of the international...  相似文献   

Discharge experiments simulating chemical evolution on the surface of Titan     

Kristof Plankensteiner  Bernd M. Rode  Tomas Mikoviny  Armin Hansel  Georg Fischer  Helmut O. Rucker 《Icarus》2007,187(2):616-619

Saturn's moon Titan has been considered as one of the few places in our Solar System, where atmospheric and surface conditions could have produced organic compounds essential as precursors for an evolution of life. The Cassini-Huygens mission has provided new data on Titan's atmosphere and surface, which enabled us to simulate the chemical processes occurring under these conditions. Possible lightning events on Titan cannot only produce higher hydrocarbons, but also allow surface water ice to participate in the reaction scenario, resulting in CHO, CHN, and CHON compounds including several molecules relevant for the formation of amino acids and nucleic acids.  相似文献