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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Economic Psychology 15 (1994), S. 467-486 
    ISSN: 0167-4870
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Psychology , Economics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    European Journal of Political Economy 10 (1994), S. 749-763 
    ISSN: 0176-2680
    Keywords: Growth accounting ; Union density ; [JEL classification codes] J51
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Economics
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  • 3
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Economics of Education Review 11 (1992), S. 41-49 
    ISSN: 0272-7757
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Education , Economics
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Economics of Education Review 12 (1993), S. 299-309 
    ISSN: 0272-7757
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Education , Economics
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary In the butanol/isopropanol batch fermentation adsorption of alcohols can increase the substrate conversion. The fouling of adsorbants by cells and medium components is severe, but this has no measured effect on the adsorption capacity of butanol in at least three successive fermentations. With the addition of some adsorbants it was found that the fermentation was drawn towards the production of butyric and acetic acid.
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  • 6
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary In a butanol batch fermentation the substrate consumption was increased threefold using in-situ product recovery by gas-stripping, in comparison with a control fermentation without product recovery. In a continuous fermentation in-situ recovery led to an increase in the biomass concentration, resulting in a threefold increase in productivity. The substrate consumption was increased by 10%. An external stripper was used as apparatus for the butanol recovery.
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  • 7
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary In a recycle system in which evaporation is used for ethanol recovery during fermentation, temperature changes of the broth in the loop will occur. These repeated temperature shocks may have an effect on the microbial ethanol production rate. In this study such repeated temperature changes were simulated in a recycle system with ethanol production by baker's yeast. The magnitude of the temperature change, as well as the time of exposure to this change were found to have an effect on the ethanol production rate. A temperature increase from 30°C in the fermentor to 35°C or more in the recycle loop led to a significantly lower ethanol concentration in the broth. This effect became negligible at a short exposure time of 18 s of the yeast to the higher temperature.
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  • 8
    ISSN: 1365-3180
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: A simulation model for crop-weed competition, parameterized for sugar beet and Chenopodium album L., was validated with experimental data from five field experiments. Between the experiments, 98% of the variation in yield loss, ranging from –6 to 96%, was explained by the simulation model. After validation, the model was used to analyse the backgrounds of the distinct differences in yield loss between the experiments. The contribution of differences in water shortage appeared to be negligible. The number of days between crop and weed emergence, which ranged from 0–31 days, appeared to be the main factor responsible for the differences in yield loss between the experiments (96%). Further analysis showed that water shortage only influences competitive strength of the weeds when overtopped by the crop. Temperature in the period between crop and weed emergence appeared to be an important factor determining the competitive relationships. It is concluded that the period between crop and weed emergence should be expressed as a developmental measure (i.e. degree days) instead of days. Morphological characteristics such as the relative growth rate of leaf area in early growth phases, specific leaf area and height increase largely determined the competitive strength of a species. The effect of physiological characteristics, such as maximum rate of leaf photosynthesis, was less significant. Un modèle écophysiologique pour la compétition interspécifique appliquéà l'influence de Chenopodium album L. sur la betterave sucrière II. Evaluation du modèleUn modèle de simulation de la compétition culture/adventice, paramétré pour la betterave et Chenopodium album L. a été validé avec des données expérimentales issues de 5 essais de plein champ. Entre les essais, 98% de la variation de perte de rendement, allant de – 6 à 96%étaient expliqués par le modèle de simulation. Après validation, le modèle a été utilisé pour analyser les courbes des différences de pertes de rendement entre les essais. Les différences liées au manque d'eau sont négligeables. Le nombre de jour entre la levée de la culture et de l'adventice qui a varié de 0 à 31 jours, est apparu être le principal facteur responsable des différences entre perte de rendement entre les essais (96%). D'autres analyses ont montré que le manque d'eau influence seulement la vigueur de compétition des adventices quand elles sont recouvertes par la culture. La température de la période entre la levée de la culture et de l'adventice apparaît être un important facteur déterminant les relations de compétition. II estconclu que la période entre la levée de la culture et de l'adventice devrait être exprimée en mesure de développement (par exemple en degrés/jour plutôt qu'en jour). Des caractéristiques morphologiques comme le taux de croissance relative de la surface foliaire dans les premiers stades, la surface spécifique foliaire et l'augmentation de hauteur, déterminent grandement la vigueur de compétition d'une espèce. Les effets des caractéristiques physiologiques comme le taux maximum de la photosynthèse foliaires sont moins significatifs. Ein ökophysiologisches Modell der interspezifischen Konkurrenz von Chenopodium album auf die Zuckerrübe. II. ValidierungEin Simulationsmodell zur Konkurrenz zwischen Kulturpflanze und Unkraut, hier Zuckerrübe (Beta vulgaris L.) und Weißer Gänsefuß (Chenopodium album L.), wurde anhand von Daten aus 5 Freilandversuchen validiert. 98% der Variation der Ertragsverluste, die zwischen –6 und 96% lagen, wurden anhand des Modells erklärt. Nach der Validierung wurden mit dem Modell die Bestimmungsgründe für die jeweiligen Unterschiede der Ertragsverluste analysiert. Der Beitrag von Unterschieden des Wassermangels erschien als vernachlässigbar. Die Konkurrenzkraft der Unkräuter wurde durch Wassermangel nur beeinflußt, wenn sie von der Kulturpflanze überwachsen wurden. Die Anzahl der Tage zwischen dem Auflaufen der Kulturpflanze und der Unkrautart, das 0 bis 31 Tage auseinander lag, erwies sich als größter Faktor für die Ertragsverlustunterschiede (96%). Die Temperatur während der Keimperiode war für die Bestimmung der Konkurrenzbeziehungen wichtig. Deshalb sollte die Keimperiode zwischen Kulturpflanze und Unkraut mit einem Entwicklungsmaß (d.h. Temperatursummen) anstatt in Tagen bemessen werden. Morphologische Kenndaten wie relative Wuchsrate der Blattfläche in frühen Entwicklungsstadien, spezifische Blattfläche und Wuchshöhe bestimmten die Konkurrenzkraft einer Art in hohem Maße. Physiologische Daten wie maximale Photosyntheserate waren weniger signifikant.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 60 (1930), S. 617-623 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Zusammenfassung Es wird die Konzentration der positiven Hg-Ionen im Innern der Oxydspirale eines Niedervoltbogens in einem Gemisch von Neon und Quecksilberdampf nach zwei Methoden (photographisch und photoelektrisch) bestimmt. Beide Methoden liefern Werte, die wenigstens der Größenordnung nach gleich sind und auf eine Konzentration von etwa 1 bis 2. 1012 Ionen/ccm hinweisen. Es wird darauf aufmerksam gemacht, daß wegen der unbekannten Feinstruktur der Resonanzlinie 1942 Å (22P1/2, −12S1/2 Hg II) die optisch bestimmten Konzentrationen Mindestwerte sind.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 55 (1929), S. 52-55 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Zusammenfassung Es wird der Einfluß der Verbreiterung der Emissionslinie durch Selbstabsorption auf die optische Konzentrationsmessung diskutiert und gezeigt, daß dieser in einem praktischen Falle recht beträchtlich sein kann. Es wird bewiesen, daß durch Komplikationen solcher Art die Kurve log J¦J0-Konzentration niemals einen Inflektionspunkt bekommt.
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