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  • 1
    Monograph available for loan
    Monograph available for loan
    Berlin : Akad.-Verl.
    Call number: G 5471 ; G 6451
    Type of Medium: Monograph available for loan
    Pages: XIII, 806 S. : graph. Darst., Kt.
    Uniform Title: Osnovy litologii
    Language: German
    Location: Upper compact magazine
    Location: Upper compact magazine
    Branch Library: GFZ Library
    Branch Library: GFZ Library
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  • 2
    Unknown
    Duesseldorf : Data Becker
    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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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Experimental mechanics 31 (1991), S. 118-121 
    ISSN: 1741-2765
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The increasing use of nonselective mechanical harvesters of fruit requires sorting the fruit on firmness. A model and computer program were developed based upon Hertzian impact theory which can predict the impact force function for a spherical fruit hitting a simply supported beam. The model was exercised to observe the effects of beam dimensions and fruit characteristics, including firmness, on the force function. Experimental work showed that measurements from a strain gage on the impacted beam can be used to determine the force function. The measured force function approximated the function predicted by the impact theory model. This work indicated that by the proper design of a sensing beam, fruit firmness may be sensed.
    Type of Medium: Electronic Resource
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  • 4
    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 It is well known that the microstructure of metal-matrix composite materials is significantly different from that of the unreinforced matrix. Heat treatments which optimized strength values in the matrix therefore, no longer do so in the composite. It is thus beneficial to find these variations in the heat treatment process, and to pinpoint the microstructural mechanisms responsible. It is known that, in addition to a higher dislocation density, the composite also has a very fine grain size and many whisker interfacial nucleation sites. This study has found that the time required for solutionizing appears to be much shorter in the composite primarily due to the very small grain size. It was also observed that artificial ageing was not very effective in the composite since the precipitates nucleated and grew on the whisker interfaces, therefore, only natural ageing was necessary to achieve peak tensile and yield strengths.
    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 An Al-4.3 wt% Cu-2.0 wt% Mg alloy reinforced with 20 vol% reinforcing fibres was examined after a T7 heat treatment. The expected precipitate phase was equilibrium S′ (Al2CuMg), which was confirmed to form in the monolithic alloy. However when this Al-Cu-Mg alloy was squeeze-cast into a fibre preform and given an identical T7 heat treatment a number of other phases also nucleated; these included θ′ (Al2Cu), β′ (Mg2Si) and the cubic σ phase (Al5Cu6Mg2). These additional phases were determined to nucleate and grow rapidly during the water-quench following solution treatment. The existence of excess Si (approximately 0.5 wt%) in the matrix was determined to be responsible for nucleation of these additional phases. This extra Si entered the composite matrix during squeeze-casting through breakdown of an SiO2 layer which existed at the fibre interfaces. During quenching Si clusters rapidly form and provide nucleation sites for the σ and θ′ phases. The Si clusters apparently created a compressive strain in the matrix which attracted a high concentration of small Cu atoms to their interface. The σ phase nucleated in this high-Cu region since, on a localized scale, σ became the equilibrium phase. This type of nucleation process may also explain the enhanced precipitate nucleation which occasionally takes place in other alloy systems when trace amounts of certain elements are added.
    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 An interesting cubic-shaped precipitate was observed in the matrix of a squeeze-cast Al-4.3 wt % Cu-2.0 wt % Mg/SiC composite which was heat-treated to a T7 condition. Although this phase had been observed by a few investigators in the past, it had never been examined in detail until now. This cubic phase generally had an edge length ranging from 30 to 50 nm and existed in volume fractions as high as 3.8%. Theoretical strengthening models predicted this phase to have good potential for precipitate strengthening. In addition, the cubic phase exhibited a low rate of coarsening at temperatures as high as 250 °C; apparently due to its low interfacial energy. Consequently, this cubic precipitate shows potential for increasing the useful temperature range of aluminium alloys and composites and could be of great importance to the aerospace and automotive industries.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1573-0867
    Keywords: Automatic control ; fertilizer application ; geographic information systems ; sensors ; sitespecific ; spatially-variable ; variability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The variability of crops, soils, and pests within crop production fields has led to attempts to understand those variations and to manage crop production accordingly. The rapidly expanding research and development on the management and control of crop production according to in-field variations is reviewed. The various stages and components of this spatially-variable control are classified and presented along with a proposed terminology and notation. Advances in component technologies (sensors, actuators, locators, geostatistics, geographic information systems) and their integration should reduce crop production costs and be environmentally advantageous.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1573-0646
    Keywords: pirarubicin ; anthracycline ; breast cancer ; phase II trial
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary In a phase II study, 77 patients with metastatic breast cancer were treated with pirarubicin, 70 mg/m2 iv every 3 weeks. Most of them had received prior hormonal (n = 39) and/or chemotherapeutic drug treatment for advanced disease, including anthracycline-containing regimens in 17. After a median of 5.5 treatment cycles (range 1–14), objective tumor response was seen in 22/71 (31%) evaluable patients (4CR, 18 PR). Stable disease occurred in 34 (48%) patients, whereas the tumor progressed in 15 (21%). Significant hematologic toxicity (WHO grade III–IV) requiring interval and/or dose adjustments was observed in 41 (58%) patients. Other treatment-related side effects were generally mild, and included alopecia in 52 (73%), nausea and/or emesis in 50 (70%), and stomatitis and diarrhea in 3 patients each. There was no treatment-related death, nor was there any evidence of cardiac toxicity thus far. In summary, the early results of this trial suggest that pirarubicin is an active and rather well tolerated drug in pretreated patients with advanced breast cancer.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Microchimica acta 44 (1956), S. 393-400 
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary A method is described for determining the trace elements in soils, plants, feeds, and fertilizers. The trace elements are separated from the major constituents and concentrated by shaking with complex-forming compounds, after destroying the organic material, the concentrate obtained is dissolved in acid. These solutions are brought continuously on a disk of spectrum carbon and simultaneously spectrographed in sparks. The evaluation is made by comparison with solutions of known content in the usual manner.
    Abstract: Résumé Description d'une méthode de dosage des oligoéléments dans les sols, les plantes, la nourriture et les engrais. Les éléments sont séparés de la matière à analyser, concentrés par agitation avec des substances complexantes. Après destruction de la matière organique les concentrés obtenus sont dissouts dans un acide. Ces solutions sont amenées de façon continue sur un disque en carbone pur et analysées par spectrographie d'étincelles. La détermination se fait par comparaison avec des solutions étalons suivant la méthode classique.
    Notes: Zusammenfassung Es wird eine Methode zur Bestimmung der Spurenelemente in Böden, Pflanzen, Futter- und Düngemitteln beschrieben. Die Spurenelemente werden von den Hauptbestandteilen getrennt, durch Ausschüttelung mit komplexbildenden Verbindungen angereichert, nach Zerstörung der organischen Substanz die erhaltenen Konzentrate in Säure gelöst. Diese Lösungen werden auf einer Scheibe aus spektralreiner Kohle kontinuierlich aufgebracht und gleichzeitig im Funken spektrographiert. Die Auswertung erfolgt durch Vergleich mit Lösungen bekannten Gehaltes in üblicher Weise.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Zusammenfassung In der vorliegenden Arbeit wurde erneut die Frage nach dem Zusammenhang zwischen der Farbe der Natriumeisenpyroxene und ihrer chemischen Konstitution aufgeworfen. Da die früheren Versuche, diese Frage auf analytischem Wege zu lösen, nicht zum Ziele geführt hatten, wurde hier das reine Endglied NaFeIIIISi2O6 synthetisch hergestellt; in weiteren Versuchen wurden Na und Fe3+ durch andere Ionen zu einem kleinen Teil ersetzt und der Einfluß auf die Farbe ermittelt Es wurden Versuche durchgeführt, bei denen Na durch Ca oder Cd, Fe3+ durch Mg, Mn2+, Fe2+, Co, Ni oder Zn ersetzt wurde; bei weiteren Versuchen wurde anstelle von Fe3+ zu einem kleinen Teil sowohl eines der obengenannten 2wertigen Ionen als auch Ti4+ oder Zr4+ eingebaut. Die erhaltenen Mischkristalle wurden optisch und röntgenographisch untersucht. Zur näheren Charakterisierung dieser Mischglieder wurde in einer Reihe von Schliffen das Absorptionsspektrum in verschiedenen kristallographischen Richtungen bestimmt und mit den ebenfalls aufgenommenen Absorptionskurven von natürlichen Ägirinen verglichen. Auf Grund der synthetischen Versuche werden folgende Definitionen vorgeschlagen: Die Namen Akmit und Ägirin sollen weiterhin für Natriumeisenpyroxen nebeneinander beibehalten werden, wobei die Abgrenzung gegenüber Ägirinaugit gemäß dem Vorschlag vonTröger (2) vorgenommen werden kann. Für die Unterscheidung der beiden Varietäten soll gemäß den bisherigen Gepflogenheiten die Farbe maßgebend sein. Das reine Endglied NaFeIIISi2O6 ist braun und muß deshalb als Akmit bezeichnet werden. Ferner sind mit Akmit die Mischkristalle zu bezeichnen, bei denen das Fe3+ durch Mn ersetzt ist, da auch diese Glieder braune Farbe aufweisen; die Ansicht vonGrout konnte also durch synthetische Versuche bestätigt werden. Die grüne Farbe der Ägirine in RichtungX undY wird durch die gleichzeitige Anwesenheit von 2- und 3wertigem Eisen hervorgerufen, so daß als Ägirin diejenigen Mischkristalle zu bezeichnen sind, bei denen 3wertiges Eisen durch zwertiges ersetzt ist. Der Einfluß des 2wertigen Eisens überwiegt dabei gegenüber dem Einfluß anderer Ionen. Das häufigere Auftreten des Ägirin gegenüber Akmit hat also seine Ursache darin, daß in der Natur 2wertiges Eisen praktisch stets vorhanden ist. Die Gitterkonstanten von Akmit und Ägirin sind im Bereich der hier erzielten Meßgenauigkeit gleich und wurden wie folgt bestimmt:a = 9,66 Åb = 879 Åc = 5,26 Åβ = 72,7 ° Die Arbeit wurde gefördert durch eine Spende keramischen Materials zum Bau der Versuchsöfen, wofür ich auch an dieser Stelle der Fa. Stemag in Lauf meinen Dank aussprechen möchte. Der Fa. Elchem in Nürnberg danke ich für die Durchführung der Spektralanalysen sowie für die Anfertigung einer Aufnahme mit der Guinier-Kammer. Ferner danke ich dem Institut für Anorganische Chemie der Universität Erlangen für Überlassung, bzw. Anfertigung einiger Substanzen.
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