Neue Aufschlüsse     

Walter Carlé 《International Journal of Earth Sciences》1937,28(8):625-625

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The Geology of the Ordovician and Valentian rocks of the Shelve country,Shropshire     

Walter Frederick Whittard 《Proceedings of the Geologists' Association. Geologists' Association》1931,42(4):322-IN2

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Kurt Grundlach zum Gedächtnis     

Walter Carlé 《International Journal of Earth Sciences》1944,34(7-8):777-779

Ohne Zusammenfassung  相似文献   

Dünungen im Atlantischen Ozean     

Ludwig Schubart  Walter Möckel 《Ocean Dynamics》1949,2(6):280-285

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A check on some previously reported analyses of chondrites with exceptionally high content of sulphur,chromium or manganese     

Walter Wahl  H.B. Wiik 《Geochimica et cosmochimica acta》1951,1(2):123-126

Some analyses of stony meteorites indicating a high content of sulphur, chromium or maganese have been checked. The high values previously reported are not confirmed.  相似文献   

I. Erdöl Ergebnisse der erdölgeologischen Erforschung Nordwestdeutschlands 1932–1947, ein Überblick     

Alfred Bentz  A. Meyer-Gürr  Helmut Fahrion  Walter Rühl  Wilhelm Kehrer  Hermann Deecke  H. Schlüter  Rolf Behrmann  Hans Weber  Herbert Lögters  Oswald Schmidt 《International Journal of Earth Sciences》1948,35(2):167-170

Ohne Zusammenfassung  相似文献   

Criticism of reconnection models of the magnetosphere     

Walter J. Heikkila 《Planetary and Space Science》1978,26(2):121-129

Reconnection involves singular lines called X-lines on the day and night sides of the magnetosphere, and the reconnection rate is proportional to the component of the electric field along the X-line. Although there is some indirect support for this model, nevertheless direct support is totally lacking. However, there are two distinct pieces of clearly contradictory observational evidence on the dayside. First is the failure to account for the implied energy dissipation by the magnetopause current, over 10¹¹ W, which should be easily observable as heating or enhanced flow of the plasma near the magnetopause. In marked contrast to this prediction, HEOS-2 satellite data reveal a plasma with decreased energy density and reduced flow. Second, the boundary of closed magnetic field lines is in the wrong location. In the reconnection process the plasma outflow would cut across open field lines toward higher latitudes; there should be a band of open field lines equatorward of the cleft. Observations of trapped energetic particles indicate closed field lines within the entry layer and cleft. Either one of these pieces of evidence is sufficient by itself to require drastic revision, even rejection, of the reconnection model. There is also contradictory evidence on the night side. The last closed field line capable of trapping energetic particles is poleward of auroral arcs. The implication is that the X-line is at the distant magnetopause, and not in the plasma sheet. Consequently, even if the reconnection process were operative at the nightside X-line, it would be isolated from steady state plasma sheet and auroral processes. On the other hand, substorm phenomena, in which stored magnetic energy is converted into particle kinetic energy, necessarily involve an induced electric field; that is excluded in theories of the reconnection process in which it is assumed that curl E = 0. Nevertheless, the observed easy access of energetic solar flare particles to the polar caps, and especially the preservation of interplanetary anisotropies as differences between the two polar caps, argues strongly for an open magnetosphere, with interconnection between geomagnetic and inter-planetary magnetic field lines. It is suggested that the resolution of this apparent paradox involves electric fields parallel to the magnetic field lines somewhere on the dawn and dusk sides of the magnetosphere, with an equipotential dayside magnetopause.  相似文献   

Physical properties of solar chromospheric plages     

Walter L. Kelch  Jeffrey L. Linsky 《Solar physics》1978,58(1):37-45

We compute a new grid of plage models to determine the difference in temperature versus mass column density structure T(m) between plage regions and the quiet solar chromosphere, and to test whether the solar chromosphere is geometrically thinner in plages. We compare partial redistribution calculations of Mg ii h and k and Ca ii K to NRL Skylab observations of Mg ii h and k in six active regions and Ca ii K intensities obtained from spectroheliograms taken at approximately the same time as the Mg ii observations. We find that the plage observations are better matched by models with linear (in log m) temperature distributions and larger values of m ₀ (the mass column density at the 8000 K layer in the chromosphere), than by models with larger low chromosphere temperature gradients but values of m ₀ similar to the quiet Sun. Our derived temperature structures are in agreement with the grid originally proposed by Shine and Linsky, but our analysis is in contrast to the study by Kelch which implies that stellar chromospheric geometrical thickness is not affected by chromospheric activity. We conclude that either the stellar Mg ii observations upon which the Kelch study was based are of poorer quality than had been assumed, or that the spatial averaging of inhomogeneous structures, which is inherent in the stellar data, does not lead to a best fit one-component model similar in detail to that of a stellar or a solar plage.Visiting Astronomer at Kitt Peak National Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under contract with the National Science Foundation.Staff member, Quantum Physics Division, National Bureau of Standards.  相似文献   

Waste Management Activities in the Atomic Energy Commission     

Walter G. Belter 《Ground water》1963,1(1):17-24

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Impact of tailings from the Kilembe copper mining district on Lake George, Uganda     

Michael Owor  Tina Hartwig  Andrew Muwanga  Dieter Zachmann  Walter Pohl 《Environmental Geology》2007,51(6):1065-1075

The abandoned Kilembe copper mine in western Uganda is a source of contaminants, mobilised from mine tailings into R. Rukoki flowing through a belt of wetlands into Lake George. Water and sediments were investigated on the lakeshore and the lakebed. Metal associations in the sediments reflect the Kilembe sulphide mineralisation. Enrichment of metals was compared between lakebed sediments, both for wet and dry seasons. Total C in a lakebed core shows a general increment, while Cu and Co decrease with depth. The contaminants are predominant (> 65%) in the ≤ 63 μm sediment size range with elevated Cu and Zn (> 28%), while Ni, Pb and Co are low (< 18%) in all the fractions. Sequential extraction of Fe for lakeshore sediment samples reveals low Fe mobility. Relatively higher mobility and biological availability is seen for Co, Cu and S. Heavy metal contents in lake waters are not an immediate risk to the aquatic environment.  相似文献