Dimensionless number and approximate calculation of the upper particle size of floatability in flotation machines     

H.J Schulze 《International Journal of Mineral Processing》1982,9(4):321-328

Two simple approximating equations are given for the calculation of the upper particle size of floatability under the turbulent hydrodynamic conditions in a flotation machine (apparatus). They comprise solid density ?_p, fluid density ?_fl, surface tension σ, contact angle θ and a parameter depending on energy dissipation, the vortex acceleration, which we call “machine acceleration” $\text{b}{}_{\mathrm{<mtext>m</mtext>}}$. Some diagrams are shown for practical purposes. A dimensionless characteristic number analogous to the bond number is introduced in order to characterize the stability of aggregates.  相似文献   

The upper Cenomanian (Cretaceous) ammonite Neolobites vibrayeanus () in the Middle East: taxonomic and palaeoecologic remarks     

Frank Wiese  Frauke Schulze 《Cretaceous Research》2005,26(6):930-946

In the Middle East and Africa, the Cenomanian ammonite genus Neolobites occurs, partly in great abundance, in shallow marine shelf settings. The genus includes several species but it has remained uncertain to what extent these species reflect biospecies, chronospecies or morphological variants. Based on material from Jordan and Egypt, the morphological variation of Neolobites vibrayeanus is described and discussed. From the several species of Neolobites described in the literature, only N. vibrayeanus, N. fourtaui and N. peroni appear to deserve specific separation. Sedimentological and lithological data, notably the common occurrence in strata that were possibly deposited above storm wave base, suggest that Neolobites was able to inhabit shallow marine settings. In these settings, it seems to form a distinct assemblage with the nautiloid Angulithes. Although N. vibrayeanus shows morphological variability between distinct populations, local N. vibrayeanus assemblages seem to develop morphologically stable populations that show only a little morphological overlap with those of other areas. This may be the reason for the earlier taxonomic splitting. The occurrence in habitats in which other stratigraphically significant ammonites are often missing may be the reason for the previous poor dating of Neolobites assemblages.  相似文献   

Evidence of subduction and crust–mantle mixing from a single diamond     

Daniel J. Schulze  Ben Harte  John W. Valley  Dominic M.DeR. Channer 《Lithos》2004,77(1-4):349-358

Cathodoluminescence (CL) imaging of polished sections of a diamond from the Guaniamo region of Venezuela suggests a history of the diamond involving two periods of growth separated by a period of resorption and possibly brittle deformation. In situ electron probe analysis of multiple eclogitic garnet inclusions reveals a correlation between garnet composition and location in the stone. An early-formed garnet in the diamond core has higher Ca/(Ca+Mg) and lower Mg/(Mg+Fe) values than later garnets associated with the second period of diamond growth. This variation conforms to an extensive trend of variation in the suite of eclogitic garnets extracted from Venezuelan diamonds. The diamond is zoned in carbon isotope composition (in situ secondary ion mass spectrometry, SIMS, data). The core compositions (δ¹³C PDB), corresponding to the first stage of growth, average −17.7‰. The second period of growth is apparently in two sub-sets of CL zones with mean values of −13.0‰ and −7.9‰. Nitrogen contents of diamond are low (30–300 atomic ppm) and do not correlate with carbon isotope composition. Oxygen isotope ratios of the garnet inclusions are elevated substantially above those expected for “common mantle”; δ¹⁸O VSMOW of early garnet is approximately +10.5‰ and two late garnets average +8.8‰. The evolutionary trend of magnesium enrichment in garnet is unlikely to represent igneous fractionation. The stable isotope data are consistent with diamond formation in subducted meta-basic rocks that had interacted with sea water at low temperatures at or near the sea floor and contained a substantial biogenic carbon component. During or following subduction, diamonds continued to form in an evolving system that was progressively modified by interaction with mantle material.  相似文献   

Untersuchungen über das Vorkommen von Salmonellen in einer Oxydationsteichanlage     

W. Stelzer  E. Schulze  E. Ziegert 《洁净——土壤、空气、水》1986,14(5):521-525

The examined oxydation pond treatment plant shows a good degradation (>95 %) of bacteriological pollution (colony count 20°, coliforms, enterococcae). In 55,6 % of raw waste water samples salmonella were detected but the effluent was free of salmonella. In total 10 sero-types were isolated and 91,1 % of all isolates were sensitive to all tested antibiotics.  相似文献   

Book reviews     

George Kish  Bernd-Michael Schulze  H. Tietze  William N. Barbat  A. Bronger  W. Frisch  B. F. Windley  W. van Berk  M. Olesch  Georg Troll  G. Müller  G. Franz 《GeoJournal》1985,11(2):197-200

  相似文献   

Book reviews     

Daniel W. Gade  Manfred Domrös  Konrad Schliephake  G. Kunkel  M.O. Lawal  Andreas Grotewold  Bernd-M. Schulze  Alexander Zaporozec  Karel Bayer  Günter Borchert  Wolf Tietze 《GeoJournal》1987,14(3):390-323

  相似文献   

II. Geophysik Die geophysikalische Erforschung Nordwestdeutschlands im Zeitraum 1932–1947, ein Überblick     

H. Reich  G. A. Schulze  Theodor Krey  Hans Closs  Bernt Paul 《International Journal of Earth Sciences》1948,35(2):171-172

Ohne Zusammenfassung  相似文献   

Über ein Strahlungsmessgerät mit Ultrarotdurchlässiger Windschutzhaube am Meteorologischen Observatorium Hamburg     

Prof. Dr. Rudolf Schulze 《Pure and Applied Geophysics》1953,24(1):107-114

Zusammenfassung Es wird ein Strahlungsmessgerät mit ultrarotdurchlässigen Windschutzhauben beschrieben, das die von uns gestellten Forderungen nach laufender Registrierung der atmosphärischen Gegenstrahlung, der langwelligen Ausstrahlung des Erdbodens, der effektiven Ausstrahlung (bei Nacht) und der Strahlungsbilanz (bei Tag) unter den Bedingungen des Windschutzes, des Strahlungsempfangs aus dem Halbraum 2 und der Befolgung des Cos-Gesetzes erfüllt und sich im Dauerbetrieb bewährt hat. Als Strahlungsempfänger werden zweiMoll'sche Thermosäulen (eine nach oben und eine nach unten gerichtet) verwendet, die gegen den Windeinfluss durch eine ultrarotdurchlässige Lupolen-H-Folie geschützt sind. Die Thermosäulen sind elektrisch derart an drei Galvanometer geschaltet, dass die atmosphärische Gegenstrahlung für sich allein, die langwellige Ausstrahlung des Erdbodens für sich allein und bei Nacht zusätzlich die effektive Ausstrahlung sowie am Tage die Strahlungsbilanz laufend registriert werden können.

---

Summary A radiation measuring instrument with windshelter transmitting infrared waves is described, it fulfills our demands for continuous records of the atmospheric radiation, of the long-wave outgoing radiation of the ground, of the effective outgoing radiation (nocturnal radiation), and of the radiation balance (during the days) on the conditions of protection against wind, of reception of radiation from the hemisphere (2 ), and of following the Cosinelaw; the instrument has proved well without interruption. The radiation is received by twoMoll thermopiles (one of which points towards the sky and the other one towards the earth's surface) which are protected against wind by means of a thin leave of Lupolen-H transmitting the infrared waves. The thermopiles are connected with three galvanometers in such a way that we are able to record continuously the atmospheric radiation for itself, the long-wave outgoing radiation of the ground for itself, and in the night additionally the effective outgoing radiation, as well as the whole day long the radiation balance.

  相似文献   

Wildfire impacts on schools and hospitals following the 2018 California Camp Fire     

Schulze  Stefanie S.  Fischer  Erica C.  Hamideh  Sara  Mahmoud  Hussam 《Natural Hazards》2020,104(1):901-925

Natural Hazards - Wildfire impacts&nbsp;on communities have become more pronounced in recent years as the intensity and frequency of wildfires have increased in densely populated areas of the...  相似文献   

The model study of the wildfire impact on the spatial distribution of deposition of sulfur and nitrogen compounds in Siberia     

E. V. Berezin  I. B. Konovalov  S. A. Gromov  M. Beekmann  E. -D. Schulze 《Russian Meteorology and Hydrology》2013,38(11):750-758

Presented are the results of the model study of wildfire impact on the spatial distribution of deposition fields of sulfur and nitrogen compounds in the regions of Siberia and the Russian Far East. The CHIMERE chemistry transport model was used for computing the deposition fields taking account of pyrogenic emissions specified using satellite measurements of intensity of wildfire heat radiation. Carried out is the model validation using the data of ground-based measurements of nitrate and sulfate concentrations in precipitation at the Russian EANET stations as well as the data of satellite measurements of carbon dioxide content in the troposphere and aerosol optical depth carried out by IASI and MODIS instruments, respectively. It is demonstrated that wildfires considerably influence deposition of sulfur and nitrogen compounds and redistribution of nitrogen compounds assimilated by plants within the regions under consideration.  相似文献