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  • 1
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    PANGAEA
    In:  Supplement to: Patzelt, Gernot; Schneider, E; Moser, G (1984): Der Lewis-Gletscher, Mount Kenya Begleitworte zur Gletscherkarte 1983. Zeitschrift für Gletscherkunde und Glazialgeologie, 20, 177-195, hdl:10013/epic.42903.d002
    Publication Date: 2020-01-17
    Description: In February of 1983 a new terrestrial photogrammetric survey of Lewis Glacier (0° 9' S) has been made, from which the present topographic map has been produced in a scale of 1:5000. Simultaneously a survey of 1963 was evaluated giving a basis for computations of area and volume changes over the 20 year period: Lewis Glacier has lost 22 % of its area and 50 % of its volume. Based on maps and field observations of moraines 10 different stages were identified. Changes of area and volume can be determined for the periods after 1890, two older, undated stages are presumed to be of Little Ice Age-origin. Moderate losses from 1890 to 1920 were followed by strong, uninterrupted retreat up to present. In this respect Lewis Glacier behaves as all other equatorial glaciers that were closer examined. Compared to alpine glaciers the development was similar up to 1950. In the following years, however, the glaciers of the Alps gained mass and advanced while Lewis Glacier experienced its strongest losses from 1974 to 1983.
    Type: Dataset
    Format: application/pdf, 592.0 kBytes
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  • 2
    ISSN: 1573-885X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Fracture mechanics requires the evaluation of defects in structural elements by nondestructive test methods. It is necessary to know the geometry of the defects, the microstructure of the material, and the stresses near the defects. Acoustic emission is used to investigate the crack growth. We also give a brief overview of recent advances in this field.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Over the years nuclear methods have proved to be a valuable asset to industry in general and to the automotive industry in particular. This paper summarizes some of the most important recent contributions of nuclear technology to the development of vehicles having high quality and long-term durability. Radiotracer methods are used to measure engine oil consumption and the wear rates of inaccessible components. Radiographic and tomographic methods are used to image fluids and structures in engines and accessory components. Tracers are used to understand combustion chemistry and quantify fluid flow. Gauging methods are used for inspection and process control. Nuclear analytical methods are used routinely for materials characterization and problem solving. Although nuclear methods are usually considered as the means of last resort, they can often be applied more easily and quickly than conventional methods when those in industrial engineering and R&D are aware of their unique capabilities.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1352-8661
    Keywords: MRI ; animal model ; microthrombotic cortical lesion ; volumetric imaging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Physics
    Notes: Abstract The development of the Rose Bengal model of cerebral infarction in the rat is monitored using rapid NMR imaging techniques. The lesion volume,T 1,T 2, and the apparent diffusion coefficient (ADC) are measured in the time interval between 24 and 168 h postinduction. VolumetricT 1-weighted 3D imaging of the lesions produced by this model is shown to have a standard error of about 5% over the first 3 days postinduction, rising to about 15% at 1 week. Both theT 1 andT 2 contrasts are found to be more durable than those in ADC and are, hence, more suitable for volumetric monitoring over this time period. An elevation in ADC is also observed in tissue outside the lesion and this is interpreted as being caused by the transport of edema away from the lesion.
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  • 5
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary The use of tri-n-butyl phosphate for the extraction of small amounts of iron and cobalt from a neutral thiocyanate containing aqueous phase results in stable, colour-intensive solutions which permit a simultaneous sensitive photometric determination of these elements in high-purity nickel and nickel salts. The limits of detection of the procedure in 10 g samples are 3 · 10−6 % Fe and 2 · 10−5 % Co. The relative standard deviations are lower than 5%.
    Notes: Zusammenfassung Die Verwendung von Tri-n-butylphosphat zur Extraktion kleiner Eisen- und Kobaltgehalte aus neutraler thiocyanathaltiger wäßriger Phase führt zu beständigen, farbintensiven Lösungen, die eine gleichzeitige empfindliche photometrische Bestimmung dieser Elemente in Reinstnickel und Reinstnickelsalzen ermöglichen. Die Nachweisgrenzen des Verfahrens liegen für die von uns angewandten 10 g-Einwaagen bei 3 · 10−6 % Fe bzw. 2 · 10−5 % Co. Die relativen Standardabweichungen sind kleiner als 5%.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Mit Hilfe der Felddesorptionsmassenspektrometrie wurde der biologische Abbau von Nonylphenolethoxylat (NPE) und Ditalgfettdimethylammoniumchlorid (DTDMAC) in Flußwasser untersucht. NPE wird innerhalb von 3 Tagen zum Homologen mit zwei Ethylenoxideinheiten abgebaut, während der weitere Abbau sehr viel langsamer erfolgt. Als weitere Metaboliten wurden NPE mit einer Ethylenoxideinheit (adsorbiert an der Bakterienmasse) und Nonylphenolethoxycarbonsäuren beobachtet. DTDMAC zeigt einen Primärabbau von 70–75 % innerhalb von 40 Tagen.
    Notes: Summary The biodegradation of nonylphenolethoxylate (NPE) and ditallowdimethylammoniumchlorid (DTDMAC) has been monitored by field desorption mass spectrometry using the river-die-away-test. NPE biodegraded within three days to give the homologue with two ethylenoxide units while further biodegradation is considerably slower. In addition, NPE with one ethylenoxide unit (adsorbed at the bacteria mass) and nonylphenolethoxycarbonic acids are observed as further metabolites. DTDMAC shows a primary biodegradation of 70–75% within 40 days.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Ocean dynamics 24 (1971), S. 49-73 
    ISSN: 1616-7228
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Description / Table of Contents: Zusammenfassung Vermessungen, die kürzlich vom U.S. Naval Oceanographic Office durchgeführt worden sind, haben sehr dazu beigetragen, das Wissen über die primären und sekundären Prozesse zu erweitern, die die derzeitige Morphologie des nordöstlichen Teiles des Atlantischen Ozeans und der Labrador-See geschaffen haben. Primäre Prozesse werden direkt der Entstehung von ozeanischer Kruste an der Achse des Mittelatlantischen Rückens zugeschrieben. Wechselnde Richtungen der Achse haben drei verschieden orientierte getrennte Streifen ozeanischer Kruste seit 60 Millionen Jahren hervorgebracht. Der Augenschein läßt vermuten, daß eine noch ältere Achse verantwortlich gewesen sein kann für das Öffnen zwischen Labrador-See und Biscaya Bucht im frühen Mesozoikum. Sekundäre Prozesse haben die vulkanische Kruste verändert und tun dieses noch. Die Hauptwirkungskraft ist eine starke thermo-haline Zirkulation, die in manchen Gebieten Ablagerungen in großen Streifen aufhäuft und an anderen Stellen Erosionen verursacht.
    Abstract: Résumé De récentes explorations effectuées par l'U.S. Naval Océanographic Office ont grandement enrichi notre connaissance des processus primaire et secondaire qui sont à l'origine de la morphologie actuelle de l'Atlantique Nord-Est et de la mer du Labrador. Les processus primaires remontent directement à la création de croûte océanique dans l'axe de la chaîne océanique médiane. Des changements d'orientation de l'axe ont donné naissance à trois bandes discontinues, d'orientations différentes, de la croûte océanique depuis 60 millions d'années. On est en droit de penser qu'un axe, plus ancien encore, a provoqué l'ouverture mer du Labradorgolfe de Gascogne au messzoïque supérieur. Des processus secondaires ont modifié — et continuent de modifier — la croûte ignée. Le facteur le plus important est une forte circulation thermo-haline qui entasse les sédiments en grandes masses en certaines zones et, ailleurs, en entraîne l'érosion.
    Notes: Summary Recent surveys by the US Naval Oceanographic Office have added greatly to the knowledge of the primary and secondary processes which have created the present morphology of the northeastern Atlantic and Labrador Sea. Primary processes are directly attributed to the generation of oceanic crust at the axis of the Mid-Oceanic Ridge. Shifting orientations of the axis have produced three differently oriented discrete stripes of oceanic crust since 60 million years ago. Evidence suggests a yet older axis may have been responsible for the opening of the Labrador Sea-Bay of Biscay in the early Mesozoic. Secondary processes have and are still modifying the igneous crust. The prime agent is a strong thermo-haline circulation which is piling up sediment into great plumes in some areas and eroding in other locales.
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