Neue hydrographische Untersuchungen mit „Anton Dohrn“ in der Island-See     

Wolfgang Krauß 《Ocean Dynamics》1958,11(1):26-30

Zusammenfassung Die Untersuchungen mit Anton Dohrn im April 1957 bestätigen in den wesentlichen Zügen das aus dem Material der Jahre 1929–1933 gewonnene Bild über die ozeanische Zirkulation im Seegebiet zwischen Island und Grönland.

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Recent hydrographic investigations made on board the Anton Dohrn in the Icelandic Sea (Denmark Strait)

Summary The investigations made on board the research ship Anton Dohrn in April 1957 essentially confirm the conception of the oceanic circulation in the sea area between Iceland and Greenland formed after the observational material obtained in 1929/33.

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Récentes recherches hydrographiques effectuées à bord de l' «Anton Dohrn» en mer d'Islande (Détroits de Danemark)

Résumé Les recherches, effectuées à bord du navire explorateur «Anton Dohrn», en avril 1957, vérifient essentiellement la conception, formée sur les données d'observation de 1929/33, de la circulation océanique dans les parages compris entre l'Islande et le Groenland.

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Transmission electron microscopy on meteoritic troilite     

Jutta Töpel-Schadt  Wolfgang Friedrich Müller 《Physics and Chemistry of Minerals》1982,8(4):175-179

Phase transitions and associated domains of meteoritic troilite (FeS) have been studied by means of transmission electron microscopy (TEM). Three polymorphs have been found, two of which can be described by superstructures of the NiAs-type structure (A, C subcell). The P \(\overline 6\) 2c (√3A, 2C) polymorph, stable at room temperature, displays antiphase domains with the displacement vector 1/3< \(\overline {\text{1}}\) 10>. In situ heating experiments showed that the P \(\overline 6\) 2c polymorph changes at temperatures of 115°–150° C into an orthorhombic pseudohexagonal transitional phase with the probable space group Pmcn (A,√3A, C). It contains antiphase domains with the displacement vector 1/2 [110] and twins with a threefold twin-axis parallel c. When heated above 210° C the transitional phase transforms into the high-temperature modification with NiAs structure (P6 ₃/mmc). All observed phase transitions are reversible. The occurrence of antiphase and twin domains, respectively, agrees with the symmetry reductions involved in the subsolidus phase transitions. This is demonstrated by group-subgroup relationships among the space groups P6 ₃/mmc, Pmcn, and P \(\overline 6\) 2c.  相似文献   

Workshop der «International Association for Phytoplankton Taxonomy and Ecology» (IAP) vom 27. April bis 6. Mai 1980 in Seeon/Chiemgau (BRD)     

Wolfgang Tins 《Aquatic Sciences - Research Across Boundaries》1981,43(1):1-3

Ohne Zusammenfassung  相似文献   

Vacuum energy in cosmic dynamics     

Hans Joachim Blome  Wolfgang Priester 《Astrophysics and Space Science》1985,117(2):327-335

The analysis of the Th/U ratio in meteorites and the evolutionary ages of globular clusters favour values of the cosmic age of (19±5)×10⁹ yr. This evidence together with a Hubble parameterH ₀>70 km s^–1 Mpc^–1=(14×10⁹ yr)^–1 cannot be reconciled in a Friedmann model with =0. It requires a cosmological constant in the order of 10^–56 cm^–2, equivalent to a vacuum density _v =10^–29 g cm^–3 The Friedmann-Lemaître models (>0) with a hot big-bang have been calculated. They are based on a present value of the baryonic matter density of ₀=0.5×10^–30 g cm^–3 as derived from the primordial⁴He and²H abundances.For a Hubble parameter ofH ₀=75 km s^–1 Mpc^–1, our analysis favours a set of models which can be represented by a model with Euclidean metric (density parameter ₀=1.0, deceleration parameterq ₀=–0.93, aget ₀=19.7×10⁹ yr) and by a closed model with perpetual expansion (₀=1.072,q ₀=–1.0, aget ₀=21.4×10⁹ yr). A present density parameter close to one can indeed be expected if the conjecture of an exponential inflation of the very early universe is correct.The possible behaviour of the vacuum density is demonstrated with the help of Streeruwitz' formula in the context of the closed model with an inflationary phase at very early times.  相似文献   

Shallow water wave modelling with nonlinear dissipation     

Christoph Schneggenburger  Heinz Günther  Wolfgang Rosenthal 《Ocean Dynamics》1997,49(2-3):431-444

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Presidential Address     

Wolfgang Torge 《Journal of Geodesy》1996,70(12):871-875

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European Observation Network: Ground - Based Support for Gamma-Ray Satellites     

René Hudec  Pavel Spurný  Jan Florián  Jaroslav Boček  Miloš Tichý  Jana Tichá  Libor Vyskočil  Wolfgang Wenzel  Scott Barthelmy  Thomas Cline  Niels Gehrels  Gerald Fishman  Chryssa Kouveliotou  Charles Meegan  Asen Mutafov 《Experimental Astronomy》1997,7(4):319-323

We present first preliminary results obtained with the European Observation Network consisting of 9 observatories in the Czech Republic, Germany and Bulgaria. We also discuss related problems such as the background of unknown variable stars and suggest a strategy for work in this area.  相似文献   

Constraints on Variscan granite emplacement in north-east Bavaria,Germany: further clues from a petrogenetic study of the Mitterteich granite     

Wolfgang Siebel 《International Journal of Earth Sciences》1995,84(2):384-398

Petrochemical and Rb-Sr, K-Ar and Sm-Nd isotopic data presented for the Mitterteich granite provide information on whole rock and mineral compositional characteristics, intrusion and cooling history, and protolith nature and put further constraints on the Variscan magmatic evolution in north-east Bavaria.The compositional characteristics classify the Mitterteich granite as a peraluminous (monzo-)granite (SiO₂ 67.3–73.5 wt.% ). Values for K₂O/Na₂O (> 1.2 and Al₂O₃/(CaO + N₂O + K₂O) (>1.1) are in the range of S-type granites. The rare earth elements show fractionated chondrite-normalized patterns (La _N /Yb _N =24–19) with negative Eu anomalies (Eu _N /Eu _N ^*=0.35–0.19). The micas have restricted ranges of major element composition, but reveal notable variations in trace element concentrations. Different biotite fractions of single specimens show a trend to lower concentrations of compatible elements in the finer fraction which can be explained as a result of asynchronous growth during the fractionation process. The PT conditions of crystallization of the magma based on muscovite and biotite is 600–640°C at 3 kbar. Regression of the whole rock samples gives an isochron corresponding to a ⁸⁷Rb-⁸⁷Sr age of 310 ± 7 Ma, initial ⁸⁷Sr/⁸⁶Sr of 0.7104±0.0010 (2 errors) and MSWD =0.03. Muscovite and biotite yield concordant K-Ar ages between 310 and 308 Ma, indicating a fast cooling rate of the granite intrusion. _{Nd T310}values average –4.2±1.0. Nd model ages of 1.4 Ga suggest a source region of mid-Proterozoic age.The Rb-Sr isochron age and initial Sr ratio of the Mitterteich granite are indistinguishable from those of the adjacent Falkenberg granite, establishing a genetic link. However, the K-Ar mica ages suggest that the Mitterteich granite must have undergone a faster uplift or cooling history than Falkenberg. Confronted with the geochronological record of granite emplacement in north-east Bavaria, the new results substantiate the view of three key periods of magmatic activity around 330–325, 315–305 and 290 Ma.  相似文献   

Distribution and Migrations of two Cerithid Snails on a Sand Flat in Bermuda     

Wolfgang  Wieser  Manfred  Grabner Franz  Koch 《Marine Ecology》1981,2(1):63-75

Abstract. Two species of cerithid prosobranchs live on a sand flat in Bermuda. At low tide during day light Batillaria minima is found on the surface whereas Cerithium lutosum remains buried in the sediment. This correlates with much higher lethal and coma temperatures, as well as much greater resistance to desiccation, of the former species. However, at other diurnal or tidal stages the two species co-occur in the same layer of sand. Despite greater resistance to physical factors the population of B. minima seems to be declining since in 1980 juveniles of this species were rare on Tuckers Town Flat whereas the population of C. lutosum was thriving.  相似文献   

Beitrag zum Problem der Eisbildung in Wasserwolken     

Wolfgang W. Ehrenberg 《Meteorology and Atmospheric Physics》1952,5(2):158-165

Zusammenfassung Maßgebend für die künstliche Eisbildung ist die Gesamtoberfläche der Impfsubstanz bzw. die Gesamtenergie der Erschütterung, wobei eine Oberfläche von 1 cm² einer Energie von zirka 740 erg gleichwertig ist. Keine Sonderstellung des Silberjodids.

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Summary In the transformation of water into ice by artificial means the total surface of a crystal seed is decisive or the total energy of a concussion, with 1 cm² being equivalent to ca. 740 erg, Ag J forming no exception.

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Résumé Ce qui est déterminant dans le processus de la formation artificielle de la glace c'est la surface totale de la substance servant à ensemencer ou plutôt l'énergie totale de l'ébranlement, une surface de 1 cm² équivalent ici à une énergie d'environ 740 ergs. L'iodure d'argent n'occupe pas de place privilégiée.

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Mit 3 Textabbildungen  相似文献