Introduction: European Land–Ocean Interaction Studies: the ELOISE thematic network     

Nicholas Murray  Klaus-Günther Barthel  Hartmut Barth  Christos Fragakis   《Continental Shelf Research》2001,21(18-19)

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A polarized neutron study on synthetic Mn2SiO4     

Werner Lottermoser  Hartmut Fuess 《Physics and Chemistry of Minerals》1992,19(1):46-51

The magnetization density of Mn₂SiO₄ was determined by diffraction with polarized neutrons at 20 K (antiferromagnetic spin state) in an applied magnetic field of 4.62 Tesla. A unique data set of 199 flipping-ratios was registered up to sin Θ/gl=9.0/nm, and the magnetic moments for the different sites were derived (μ(M1)=2.56(2) μ _B, μ(M2)=4.33(2) μ _B) after correction of field-induced ferromagnetic moments and antiphase domains. Fourier inversion of the magnetic structure factors produced the magnetization density in the unit cell with small contributions close to those oxygens involved in superexchange.  相似文献   

TUVAS: Schadstoffstrukturen und Monitoring in der Deutschen Bucht     

Dr. Hartmut Heinrich 《Ocean Dynamics》1991,44(5-6):405-406

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Harmonization of environmental measurement     

Hartmut Keune Dr.  A. Beatrice Murray Dr.  Heiner Benking 《GeoJournal》1991,23(3):249-255

A wealth of data on the state of the environment is being created in innumerable programmes world-wide. Optimal use of this data requires that information on its existence is available, that it can be readily accessed and — most important — that the data be compiled and classified in a compatible way. Achieving this is the basic aim of harmonization of environmental measurement. Although great care is generally taken to harmonize data collected within programmes, harmonization between programmes remains a major goal for the future.In 1989 UNEP established an office as a basis for the planned Harmonization of Environmental Measurement Project under the auspices of the Global Environmental Monitoring System (GEMS). The office describes the mission, rationale, and objectives of the project and the concepts underlying the harmonization of information on the environment collected at different levels and in different programmes.  相似文献   

The dependence of the measured cool skin of the ocean on wind stress and total heat flux     

Hartmut Grassl 《Boundary-Layer Meteorology》1976,10(4):465-474

The temperature drop T between the ocean surface and the 5-cm depth was recorded during GATE, Phase III. With measured values of the total heat flux Q and an assumption about the thickness of the viscous boundary layer of the ocean, the wind-speed dependence of the factor of proportionality between T and Q is determined. This factor depends on the deviations of the thickness of the conductive layer from the thickness of the viscous layer and possibly partially on the wind stress. A further assumption about the thickness of the conductive layer leads to a wind-speed dependence of the ratio between total wind stress and its wave supporting part of it. This ratio increases from a value 1.5 at 1 m s^–1 to 9 at 10 m s^–1, which is in agreement with existing estimates.  相似文献   

Strain and creep measurements on rocks by halographic interferometry     

Hartmut Spetzler  C. H. Scholz  Chi-Ping J. Lu 《Pure and Applied Geophysics》1974,112(3):571-581

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Rezente marine Eisenerze auf Santorin,Griechenland     

Harald Puchelt  Hans Hartmut Schock  Erich Schroll  Helmut Hanert 《International Journal of Earth Sciences》1973,62(3):786-812

Recent iron sediments forming at present in a bay of the volcanic island Palaea Kameni within the caldera of Santorini, Aegean Sea, have been investigated for their mineralogy and geochemistry. For the first time siderite has been found in a marine environment to be major constituent of a recent sediment. Further main constituents are opal, ferric hydroxide, vivianite, ferrous hydroxide, and possibly ferrous silicate. The chemical composition both of the solid material of the sediment cores and of their pore solution indicate that the ore forming solutions have originated from the leaching of volcanic kalk-alcaline rocks by hot acid solutions. This is in agreement with experimental leaching of these rock types. No enrichment of lead, copper, zinc etc. was found in the sediments. Iron oxidizing bacteria in the reddish-brown ferric hydroxide sediments now forming in bays of the Kameni Islands have been studied by light and electron microscopic investigations. Samples from the uppermost parts of the sediment consist mainly of the ferric hydroxide stalks of the iron bacteriumGallionella ferruginea. The stalks showing their morphological characteristics occur in such masses that there is no doubt concerning the presence, activity and share of these bacteria in the process of iron sedimentation. Phases of sedimentation process and kinetics of ferric hydroxide stalk formation have been determined qualitatively and quantitatively by in-situ-experiments using artificial growing surfaces (underwater “Aufwuchs” on glass slides). The results obtained are compared to similar iron sedimentation in fresh water habitats and iron rich carbonate springs discussed in literature in connection with the problem of submarine exhalative sedimentary iron ore formation.  相似文献   

Neuere Veröffentlichungen     

Ekkehard Mittelstaedt  Hartmut Heinrich 《Ocean Dynamics》1988,41(2):87-90

Ohne Zusammenfassung  相似文献   

Modelling the responses of mature forest trees to air pollution     

Heiner Schäfer Dr.  Hartmut Bossel  Holger Krieger  Norbert Trost 《GeoJournal》1988,17(2):279-287

Systems analysis of the responses of forest trees to air pollutants led to mathematical models which represent the essential life processes of mature trees (photosynthesis, respiration, growth etc.) under ‘normal’ conditions and — especially — under pollution strees. Computer simulations using these models have made it possible to test and analyse the consequences of — known or hypothetical — pollution effects. The simulation runs have led to the identification of three distinct behavioural modes (growth, stagnation, breakdown) and corresponding stable and unstable system states. The results have produced new insights and contributed to the understanding of the dieback process of spruce and beech trees. The presentation will concentrate on the most recent and most complex of the hitherto existing models, theBeech model.  相似文献   

Die Kontamination von Nord- und Ostsee durch den Reaktorunfall von Tschernobyl     

Dr. Hartmut Nies  Christoph Wedekind 《Ocean Dynamics》1987,40(6):277-288

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