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  • 2015-2019  (188)
  • 1990-1994  (50)
  • 1985-1989  (25)
  • 1950-1954  (8)
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  • 1
    Unknown
    Das große Buch zu Excel3 (1991)
    Duesseldorf : Data Becker
    Details Availability
    Call number: 92-0026
    Pages: 1113 S. mit Diskette ; 24 cm
    ISBN: 3890113559
    Series Statement: Data Becker 355
    Branch Library: AWI Library
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  • 2
    Electronic Resource
    Electronic Resource
    Preparation of nanoscale platinum(0) clusters in glassy carbon and their catalytic activity (1993)
    s.l. : American Chemical Society
    Chemistry of materials 5 (1993), S. 1727-1738 
    Details
    ISSN: 1520-5002
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/cm00036a010
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  • 3
    Electronic Resource
    Electronic Resource
    Crystalline nanoscale platinum(0) clusters in glassy carbon (1993)
    s.l. : American Chemical Society
    Chemistry of materials 5 (1993), S. 11-13 
    Details
    ISSN: 1520-5002
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/cm00025a005
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  • 4
    Electronic Resource
    Electronic Resource
    Rutherford scattering at TEXTOR : Proceedings of the 9th topical conference on high temperature plasma diagnostics (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 4583-4585 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The Rutherford scattering diagnostic at TEXTOR is used to perform temporal and spatial resolved measurements of the ion temperature. Function parametrization techniques are used for fast analysis of the complex spectra, which also contain information about the presence of impurities in the scattering volume. The (perpendicular) central ion temperature has been determined for a series of discharges, where neutral beam coinjection (hydrogen) was applied to plasmas of different densities. A temperature of 2.8 keV was found for a line-averaged electron density of 1.5×1019 m−3, decreasing monotonically for higher densities to 0.8 keV at 6.0×1019 m−3. When deuterium was used as heating beam species, scattering on a high-Z impurity, probably tungsten from the filaments of the NBI sources, gave a dominant contribution to the spectra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143677
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  • 5
    Electronic Resource
    Electronic Resource
    Ion temperature measurements in tokamak plasmas by Rutherford scattering (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 3359-3368 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A Rutherford scattering diagnostic has been applied at the TEXTOR tokamak to obtain spatially and temporally resolved information on the temperature of the bulk ions in the plasma. In the experimental setup, a helium atomic beam (30-keV, 12-mA equivalent current) passes vertically through the plasma core. A small part of the injected atoms is scattered elastically by the thermally moving plasma ions. The ion temperature in the scattering volume can be determined from the broadening of the energy spectrum of the scattered particles. Energy analysis of the scattered atoms is performed by a mass-selective time-of-flight analyzer detecting the particles at an observation angle which is selectable between 3° and 8°. Coincidence techniques have been successfully applied in this detector for rejection of background events triggered by detections of neutrons and gamma radiation. Ion temperature profiles were measured on a shot-to-shot basis by shifting the cross section of the diagnostic beam and the observational volume of the analyzer through the plasma. The ion temperatures measured in ohmic deuterium plasmas were found to be in reasonable agreement with those obtained from passive neutral particle analysis. Up to now, ion temperatures have been measured throughout the complete discharge with an accuracy of 8% and a time and space resolution of 100 ms and 0.10 m at a scattering angle of 7°. Deuteron density profiles could be deduced from the scattering yield measured at different radial positions in the plasma. The ratio of the isotopes, hydrogen and deuterium, was determined from their separate contributions to the spectrum of helium particles scattered on hydrogen and deuterium. Although theoretical predictions showed that the majority of the probing helium atoms loses one of its electrons during the elastic scattering process on multiply charged carbon and oxygen ions, contributions from impurities to the observed experimental spectrum are shown to appear dominant for impure plasmas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142553
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  • 6
    Electronic Resource
    Electronic Resource
    Die Diorite von Dessau (1952)
    Springer
    Contributions to mineralogy and petrology 3 (1952), S. 77-96 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Zusammenfassung Petrographische und chemische Untersuchungen an Dioriten und Graniten des Kyffhäuser und von Dessau lassen eine Ichor-Metamorphose, d. h. eine Alkali-Metasomatose von den Porenräumen aus, erkennen. In den metamorph-metablastischen Granitabkömmlingen wird die Ichor-Metamorphose deutlich an einer Glomeroblastenbildung und einer erneuten körnigen Texturentwicklung. Diese beweist eine Zufuhr von Albitmolekül. Sie wird in dem metamorph-metablastischen dioritischen Gestein neben der Verdrängung der primären Plagioklase aus der Alkalisierung und Enteisenung der Hornblende ersichtlich. Die magmatischen Ausgangsgesteine: Diorit, Quarzdiorit, Biotitdiorit, Gabbrodiorit (?) und Hornblendegabbro zeigen neben der Alkalisierung eine Muskovitisierung der basischen Plagioklase und eine Biotitisierung der Hornblende, woraus eine Zufuhr an Kali hervorgeht. Diese Stadien der Metamorphose durchlaufen den tektonischen Raum von der Grenze metamorph-nichtmetamorph bis hinab zur Grenze metamorph-magmatisch (Erdmannsdörffer) und rind in der Mitteldeutschen Schwelle zuerst aus dem tiefsten Stockwerk, im Südwesten im Odenwald-Spessart (Erdmannsdörffer) und nunmehr auch aus ihrer äußersten Haube erkannt worden, wo die Schwelle unter die Phyllithülle hinabtaucht.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01130079
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  • 7
    Electronic Resource
    Electronic Resource
    Structure and regulation of the isocitrate lyase gene ICL1 from the yeast Saccharomyces cerevisiae (1993)
    Springer
    Current genetics 23 (1993), S. 375-381 
    Details
    ISSN: 1432-0983
    Keywords: Saccharomyces cerevisiae ; Isocitrate lyase ; Gene regulation ; Ethanol induction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The ICL1 gene encoding the isocitrate lyase from Saccharomyces cerevisiae was cloned and sequenced. A reading frame of 557 amino acids showing significant similarity to isocitrate lyases from seven other species could be identified. Construction of icl1 null mutants led to growth defects on C2 carbon sources while utilization of sugars or C3 substrates remained unaffected. Using an ICL1-lacZ fusion integrated at the ICL1 locus, a more than 200-fold induction of β-galactosidase activity was observed after growth on ethanol when compared with glucose-repressed conditions. A preliminary analysis of the ICL1 upstream region identified a 364-bp fragment necessary and sufficient for this regulatory phenotype. Sequence motifs also present in the upstream regions of co-regulated genes were found within this region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00312621
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  • 8
    Electronic Resource
    Electronic Resource
    The influence of spatial correlation of concrete strength on the failure probabilities of reinforced concrete chinneys (1989)
    Springer
    Materials and structures 22 (1989), S. 255-263 
    Details
    ISSN: 1359-5997
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract A procedure to estimate the failure probabilities of reinforced concrete (R/C) chimneys under severe wind loading which allows for considering realistic correlation values of concrete strength is developed. The results show that the assumption of full correlation of concrete strength within cross-sections, as suggested for example in present codes, may significantly overestimate the failure rates in present examples by two orders of magnitude. However, it is also shown that not only one but a number of cross-sections may contribute to the total failure rate of R/C chimneys. As a consequence, the failure estimates increase, in some cases by as much as two orders of magnitude. In the numerical examples as investigated here these counteracting effects neutralize each other. This fact, however, should not be generalized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02472557
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  • 9
    Electronic Resource
    Electronic Resource
    Identification of UAS elements and binding proteins necessary for derepression of Saccharomyces cerevisiae fructose-1,6-bisphosphatase (1992)
    Springer
    Current genetics 22 (1992), S. 363-370 
    Details
    ISSN: 1432-0983
    Keywords: Saccharomyces cerevisiae ; Fructose-1,6-bisphosphatase ; Glucose repression ; Gene activation ; Gluconeogenesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Fructose-1,6-bisphosphatase is a key enzyme in gluconeogenesis and the FBP1 gene is not transcribed during growth with glucose. Genetic analysis indicated a positive regulation of FBP1 expression after exhaustion of glucose. By linker-deletion analysis, two upstream activation sites (UAS1 and UAS2) were localized and the respective UAS-binding factors (DAP I and DAP II for derepression activating protein) were identified by gel retardation. UAS1 and UAS2 span about 30 bp each, and are separated by approximately 30 bp. Both UAS sites act synergistically. Although UAS1 showed some similarities to the DNA-binding consensus for the general yeast activator Rap1, competition experiments and DEAE-chromatography proved that DAP I and Rap1 correspond to different proteins. Gel retardation by DAP I depended on carbon sources and did not occur in cells growing logarithmically with glucose, whereas a strong retardation signal was obtained with ethanol-grown cells. The present results suggest that DAP I and DAP II are the final regulatory elements for glucose derepression.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00352437
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  • 10
    Electronic Resource
    Electronic Resource
    Über einen ungewöhnlichen Saponit von Raschau i. Sa. (1950)
    Springer
    Contributions to mineralogy and petrology 2 (1950), S. 279-290 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01098088
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