Heavy metals in the Baltic Sea     

Lutz Brügmann 《Marine pollution bulletin》1981,12(6):214-218

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Shift — fortran IV program for shift and share-analysis     

Dr. Dipl. Math. Lutz Blumhagen  Dr. Gert Eichler 《GeoJournal》1977,1(6):17-24

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In memory of genevieve Woillard-Roucoux     

George Kukla  Alan Hecht 《Quaternary Research》1982,17(2):275

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Characterization of sediments in an abandoned mining area; a case study of Mansfeld region,Germany   总被引：1，自引：0，他引：1  

Rainer?WennrichEmail author  Jürgen?Mattusch  Peter?Morgenstern  Klaus?Freyer  Hanns-Christian?Treutler  Hans-Joachim?St?rk  Lutz?Brüggemann  Albrecht?Paschke  Birgit?Daus  Holger?Weiss 《Environmental Geology》2004,45(6):818-833

The distribution of selected heavy metals, including some radionuclides, metalloids and non-metals was determined in stream sediments in a region influenced by abandoned copper mining and ore processing activities. A considerable amount of the ore processing waste with a very complex composition and highly elevated concentrations of zinc, sulfur, lead, copper, arsenic, and a lot of other elements in the range between 100 and 1,000 mg/kg (Sb, Mn, Ni, Cr, Cd, Hg, and Ag) was piled up on mine dumps. The dispersion of the pollutants originating from this source and their environmental impact were investigated. Both, sediments and original waste material were studied to indicate the pathways and the mobilization behavior of different pollutants. For this purpose, the process of the elution of pollutants by application of different fractionation schemes was studied. The capabilities of different analytical techniques are shown for the analysis of solid samples (X-ray fluorescence spectrometry, Gamma-spectrometry) and liquid ones (ICP-atomic emission spectrometry, ICP-mass spectrometry and different techniques of atomic absorption). Additionally, the coupling of ion chromatography and ICP-MS detection was used to study the distribution of arsenic species in the sediment cores of a lake which acts as a natural sink for the region.  相似文献   

A Fully Depleted pn-Junction CCD for Infrared-, UV- and X- ray detection     

C. von Zanthier  H. Bräuninger  K. Dennerl  R. Hartmann  G. Hartner  H. Hippmann  A. Kaltenberger  E. Kastelic  W. Kink  N. Krause  N. Meidinger  G. Metzner  E. Pfeffermann  M. Popp  C. Reppin  J. Riedl  D. Stötter  L. Strüder  J. Trümper  W. Weber  D. Carathanassis  S. Engelhard  Th. Gebhart  D. Hauff  G. Lutz  R. H. Richter  H. Seitz  P. Solc  E. Biehler  H. Böttcher  E. Kendziorra  J. Krämer  B. Pflüger  R. Staubert  P. Holl  J. Kemmer  P. Lechner  B. Maier  H. Soltau  R. Stötter  E. Bihler 《Experimental Astronomy》1998,8(1):89-96

This paper describes the performance of the Fully Depleted pn-junction CCD (pn-CCD) system, developed for ESA's XMM-satellite mission for soft x-ray imaging and spectroscopy in the single photon counting mode in the 100 eV to 10 keV photon range. The 58 mm x 60 mm large pn-CCD array, designed and fabricated at the Semiconductor Lab (Halbleiterlabor) of the Max-Planck-Institut, uses pn-junctions for registers and as backside structure. This concept naturally enables full depletion of the detector volume independent of the silicon wafer's resistivity and thickness, and as such make it an efficient detector for the x-ray region and the infrared. For high detection efficiency in the soft x-ray region and UV, an ultrathin pn-CCD backside deadlayer has been realized. Each pn-CCD-channel is equipped with its own on-chip JFET amplifier which, in combination with the CAMEX-amplifier and multiplexing chip, facilitates parallel readout and fast data rate: the cooled pn-CCD system can be read out at a data rate up to 3 MHz with an electronic noise floor of ENC < 5 e-.  相似文献   

Detection of the Kuiper bands in the spectrum of Titan     

Robert G. Danehy  Tobias Owen  Barry L. Lutz  Jerry H. Woodman 《Icarus》1978,35(2):247-251

3ew spectra of Titan centered at 7500 Å, at resolutions of 4 and 1 Å are presented. Weak absorptions coincident with features observed in the spectra of Uranus and Neptune are found. This observation suggests methane abundances in excess of 1 km-am, thereby emphasizing the complexity of line formation in Titan's atmosphere. The question of the total atmospheric pressure of Titan must be reexamined.  相似文献   

The B-band luminosities of quasar host galaxies     

Knud Jahnke  Lutz Wisotzki 《Monthly notices of the Royal Astronomical Society》2003,346(1):304-318

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Relations of Rock Structure and Composition to Petrophysical and Geomechanical Rock Properties: Examples from Permocarboniferous Red-Beds   总被引：2，自引：0，他引：2  

C. A. Hecht  C. Bönsch  E. Bauch 《Rock Mechanics and Rock Engineering》2005,38(3):197-216

Summary. This study relates textural properties to physical and mechanical properties of coarse grained sedimentary rocks of Permocarboniferous age. As an equivalent to rock texture the principle of geomechanical order is applied. The geomechanical order describes a rock as a function of its structural and compositional order which are derived from petrological analyses. Our results indicate that rock properties like density and porosity are stronger dependent on the structural order, while strength properties additionally depend on the compositional order. The ultrasonic wave velocity responds to both structural and compositional properties. These evidences imply that the geomechanical order is not an independent parameter but a variable function of structural or compositional features, which needs specification for correlation purposes to distinct physical and mechanical rock properties.  相似文献   

Climatic and human history in Europe and Latin America: An opportunity for comparative study     

Robert H. Claxton  Alan D. Hecht 《Climatic change》1978,1(3):195-203

Motivated by environmental concerns, a few historians have reaffirmed that history is more than relationships among people; it involves human beings interacting with their environment. Some investigators of European history have given consideration to the effects of climate variations on human history. Preliminary examination of historic documents available for Latin America suggest that a time series of climate variations could also be reconstructed for at least the last 400 years. These preliminary data suggest that the general economic and social crises that prevailed in Europe during the Little Ice Age have parallels in Latin America. Such a concurrence of economic and social trends for these regions seems to reflect the influence of the general adverse climate prevailing during this time. Clearly, an opportunity exists for historians and climatologists to reconstruct the past climate of Latin America and compare these records with other parts of the world to establish the timing, length and magnitude of climate fluctuations over periods of human history.  相似文献   

Palaeobotanical evidence for warm summers in the East Siberian Arctic during the last cold stage     

Frank Kienast  Lutz Schirrmeister  Christine Siegert  Pavel Tarasov 《Quaternary Research》2005,63(3):175-300

Plant macrofossils from the “Mamontovy Khayata” permafrost sequence (71°60′N, 129°25′E) on the Bykovsky Peninsula reflect climate and plant biodiversity in west Beringia during the last cold stage. 70 AMS and 20 conventional ¹⁴C dates suggest sediment accumulation between about 60,000 and 7500 ¹⁴C yr B.P. The plant remains prove that during the last cold-stage arctic species (Minuartia arctica, Draba spp., Kobresia myosuroides) coexisted with aquatic (Potamogeton vaginatus, Callitriche hermaphroditica), littoral (Ranunculus reptans, Rumex maritimus), meadow (Hordeum brevisubulatum, Puccinellia tenuiflora) and steppe taxa (Alyssum obovatum, Silene repens, Koeleria cristata, Linum perenne). The reconstructed vegetation composition is similar to modern vegetation mosaics in central and northeast Yakutian relict steppe areas. Thus, productive meadow and steppe communities played an important role in the Siberian Arctic vegetation during the late Pleistocene and could have served as food resource for large populations of herbivores. The floristic composition reflects an extremely continental, arid climate with winters colder and summers distinctly warmer than at present. Holocene macrofossil assemblages indicate a successive paludification possibly connected with marine transgression, increased oceanic influence and atmospheric humidity. Although some steppe taxa were still present in the early Holocene, they disappeared completely before 2900 ¹⁴C yr B.P.  相似文献