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  • 1
    Call number: 9/M 07.0421(462)
    In: Geological Society Special Publication
    Description / Table of Contents: Abstract The Himalaya mountains contain not only one of the largest concentrations of ice outside the polar regions, but contribute to the hydrological requirements of large populations spread over seven nations. The exceptionally high elevations of this low-latitude cryosphere presents a natural laboratory and archives to study climate–tectonics interactions as well as regional v. global climate influences. The existing base-level data on the Himalayan cryosphere are highly variable. Several climate fluctuations occurred during the late Quaternary (MIS1–MIS5, especially the last c. 100 ka), which led to the evolution of the Himalayan landscape. Detailed studies of these archives, along with those of the present cryosphere and related hydrosphere, are essential for understanding the controls on present and future hydrology of the glacial-fed mountain rivers. This volume, a follow-up of the XII International Symposium on Antarctic Earth Science, Goa (A SCAR symposium), provides new data from locales spread over the entire Himalaya region and from Tibet. It provides a glimpse of the late Quaternary cryosphere, as well as a discussion in the last section on sustainability in the context of geohazard mitigations as well as the hydrological budget.
    Type of Medium: Monograph available for loan
    Pages: 210 Seiten , Illustrationen, farbige Abbildungen
    ISBN: 9781786203243
    Series Statement: Geological Society Special Publication 462
    Classification: A.3.3.
    Language: English
    Location: Reading room
    Branch Library: GFZ Library
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  • 2
    Publication Date: 2005-08-10
    Type: paper
    Format: application/pdf
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  • 3
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    In:  Supplement to: Urrego, Dunia H; Hooghiemstra, Henry; Rama-Corredor, O; Martrat, Belén; Grimalt, Joan O; Thompson, L (2015): Rapid millennial-scale vegetation changes in the tropical Andes. Climate of the Past Discussions, 11(3), 1701-1739, https://doi.org/10.5194/cp-12-697-2016
    Publication Date: 2020-01-17
    Description: We compare eight pollen records reflecting climatic and environmental change from the tropical Andes. Our analysis focuses on the last 50 ka, with particular emphasis on the Pleistocene to Holocene transition. We explore ecological grouping and downcore ordination results as two approaches for extracting environmental variability from pollen records. We also use the records of aquatic and shoreline vegetation as markers for lake level fluctuations, and precipitation change. Our analysis focuses on the signature of millennial-scale variability in the tropical Andes, in particular, Heinrich stadials and Greenland interstadials. We identify rapid responses of the tropical vegetation to this climate variability, and relate differences between sites to moisture sources and site sensitivity.
    Type: Dataset
    Format: application/zip, 228.0 kBytes
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  • 4
    ISSN: 1741-0444
    Keywords: Electromagnetic velocity catheter ; High fidelity pressure ; Phasic aortic bloof flow
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Titanium-diboride and titanium-carbide compacts with diameters of 100 mm and thicknesses of 25 mm were fabricated by self-propagating high-temperature synthesis/dynamic compaction (SHS/DC) of the elemental powders. Under the best conditions, the densities were greater than 99% and 96.8% of the theoretical densities for TiB2 and TiC, respectively. The microhardness, compressive strength, and elastic modulus of the TiB2 prepared by the SHS/DC method were comparable to reported values for hot-pressed TiB2. While the microhardness and elastic modulus of the TiC compacts were comparable to those for hotpressed TiC, the compressive strength was lower due to extensive cracks in the compacts. The TiB2 prepared using a low-purity boron powder (1–5% carbon impurity) compacted to higher densities and had less cracking than that prepared using a high-purity boron powder (0.2% carbon). This result could have an impact on the cost of producing TiB2/TiC structural components by the SHS/DC process.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Self-propagating High-temperature Synthesis (SHS) of titanium and boron carbide (B4C) combined with explosively driven Dynamic Compaction (DC) was employed for the fabrication of composite TiB2/TiC compacts. A 23 factorially designed experiment set was used to examine the effects of the TiB2/TiC ratio, delay time and C/M ratio on the consolidation and properties of the compacts. The delay time is the time between completion of the SHS reaction and compaction. The C/M ratio, the ratio of the explosive mass to that of the flyer plate, influences the pressure applied to the samples during compaction. Composites with molar TiB2/TiC ratios of 2:1 or 1:2 were prepared using Ti and B4C or Ti, C and B4C, respectively, as reactants. The SHS/DC of Ti and B4C resulted in high quality, near fully dense TiB2/TiC composite compacts. Under best conditions, the densities were greater than 98% of the theoretical maximum. While the microhardness and densities of the compacts with TiB2/TiC ratio of 2:1 were comparable to those of monolithic TiB2 and TiC, compacts with TiB2/TiC ratios of 1:2 were poorly consolidated and contained extensive cracks. Given the high energy and time efficiency, high product quality and inexpensive reactants, the SHS/DC of Ti and B4C represents an attractive technique for the economical fabrication of TiB2/TiC composites.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1572-9893
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography
    Notes: Abstract The insoluble microparticle concentrations and size distributions and oxygen isotope abundances (δ18 0) in two 1-meter ice cores from the margin of the Dunde ice cap (38° 06 'N; 96° 24 'E; 5325 masl) drilled in 1986 and three ice cores drilled to bedrock at the summit of the ice cap in 1987 suggest the presence of Wisconsin/Würm Glacial Stage (LWGS) ice in the subtropics. A Sino-American research group recovered three ice cores 136, 138 and 139 m in length from the summit of the Dunde ice cap in the Qilian Shan which are providing long, high temporal resolution climatic and environmental records for the NE section of the Tibetan Highlands. Particulate concentrations, conductivity and δ18 0 are the ice core constituents best established as indicators of the glacial/interglacial transition. The analyses of two shallow cores from the margin reveal a 14-fold increase in particulate concentration which is correlative with a 1% to 5% decrease (more negative) in δ18 0. The lower 10 to 13 m of three ice cores drilled to bedrock at the summit contain a ten-fold increase in dust (both soluble and insoluble) and a 1.2% decrease in oxygen isotopes. Additionally, the morphological properties of the particles in the LWGS ice are identical to those of the thick, extensive loess deposits of central china which accumulated during the cold, dry glacial stages of the Pleistocene. When the climatic and environmental records are fully extracted from the three deep cores they will provide a very detailed record of variations in particulates (soluble and insoluble), stable isotopes, net balance, pollen and perhaps atmospheric gases of CO2 and methane through the Holocene into the last glacial in the subtropics on the climatically important Tibetan Plateau.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1572-9931
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Efficient selection procedures, using [3 H]amino acids as the selecting agent, were developed for isolating temperature-sensitive (TS) mutations in CHO cells affecting protein synthesis. After chemical mutagenesis, leucyl-tRNA synthetase mutants were obtained when [3 H]leucine was used as the selecting agent in two independent experiments. These mutations seem to involve the same genetic locus as the TSH1 mutant described previously (1). A selection with [3 H]valine, in which all amino acids except leucine were at low concentration in the selective medium, resulted in a new class of mutants with reduced asparagyl-tRNA synthetase activity. These results were consistent with the finding that all mutants were phenotypically dependent on the concentration of amino acid, specific to the altered synthetase, in the medium. Our observations suggest that although leucyl synthetase mutations are a relatively common class of TS mutations in CHO cells, the spectrum of mutants obtained can be at least partially manipulated through concentrations of amino acids in selective media. The asparagylsynthetase mutation was shown to be recessive and to complement the leucylsynthetase mutation in cell-cell hybrids.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1572-9931
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The CHO UV-sensitive mutants UV24 and UV135 (complementation groups 3 and 5, respectively) are defective in nucleotide excision repair. After fusing each mutant with human lymphocytes, resistant hybrid clones showing genetic complementation were isolated by repeated exposure to UV radiation. Using a combination of isozyme markers, DNA probes,and cytogenetic methods to analyze the primary hybrids and their subclones, correction of the repair defect was shown to be correlated with the presence of a specific human chromosome in each case. Chromosome 2 corrected UV24, and the gene responsible was designated ERCC3.Line UV135 was corrected by human chromosome 13 and the gene designated ERCC5.The UV-sensitive mouse cell line, Q31, was shown not to complement UV135 and thus appears to be mutated in the same genetic locus (homologous to ERCC5)as UV135. Breakage of complementing chromosomes with retention of the genes correcting repair defects allowed the following provisional assignments: regional localization of ERCC5to 13q14-q34, exclusion of ERCC3from the region of chromosome 2 distal to p23, and relief of the ambiguity of ACPlassignment (2p23 or 2p25) to 2p23 proximal to MDH1.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1435-1536
    Keywords: Latex Stabilisation ; Glass Transition ; Nonionic Surfactants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Equilibrium colloid stability measurements with nonionic surfactant (C12E8) stabilised polybutyl methacrylate (PBMA) latex dispersions indicate a sudden temperature induced destabilisation coinciding with the glass transition temperature,Tg, of the polymer. In control experiments with polystyrene latex particles of similar size, for whichTg was not approached, the flocculation temperature was significantly higher. The effect is interpreted in terms of a reduced adsorbed layer thickness aboveTg caused by mixing of part of the surfactant molecule with the polymer. This interpretation is supported by DSC, elastic modulus and mechanical damping measurements on films made from dispersions of the same latex containing commercial nonionic surfactants. These measurements indicate a shift inTg in the presence of surfactant consistent with partial penetration of the polymer surface by the surfactant. In addition, C12E8 adsorption measurements show increased adsorption (or absorption) onto PBMA aboveTg which is irreversible on both dilution and temperature reduction.
    Type of Medium: Electronic Resource
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