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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Helgoland marine research 14 (1966), S. 72-77 
    ISSN: 1438-3888
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Summary 1. A floor has been constructed which, in a standard cage with simple associated circuitry, permits the potentiometric recording of the activity of individual rats by means of changes of floor resistance. 2. The main activities of rats have been found to produce characteristic frequencies of floor resistance change. 3. A transistor circuit has been devised which, using these characteristic frequencies, produces a voltage output proportional to the activity which has occurred during a short time interval. 4. It has been shown that a Data Logger may be used to monitor these voltage outputs and produce an activity record of the rats in many cages suitable for computer analysis.
    Notes: Kurzfassung Ein Gerät wird beschrieben, das die Aktivitätsregistrierung von Ratten in Einzelkäfigen über mehrere Tage hinweg ermöglicht. Durch eine elektronische Schaltung, welche mit dem Käfigboden verbunden ist, wird ein Spannungsunterschied erzeugt. Als Maß für die Aktivität der Tiere während eines bestimmten Zeitabschnittes dient die Größe des Spannungsunterschiedes. Die Aktivität mehrerer in verschiedenen Einzelkäfigen gehaltenen Ratten kann mittels Rechenmaschinen auf Lochpapierstreifen registriert werden. Hierbei werden die erzeugten Spannungsunterschiede fortlaufend durch ein geeignetes Datenerfassungs-system abgetastet.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Particle and Particle Systems Characterization 4 (1987), S. 20-21 
    ISSN: 0934-0866
    Keywords: Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Process Engineering, Biotechnology, Nutrition Technology
    Notes: It is shown that the number of particles which may be placed upon a slide is surprisingly limited if each particle is to be isolated. This is particularly relevant if automatic image analysis of size or shape is to be achieved without tedious editing. Using a simple mathematical treatment it is possible to calculate, for any particular size of particle, the number of particles on a slide which should not be exceeded.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Particle and Particle Systems Characterization 5 (1988), S. 23-28 
    ISSN: 0934-0866
    Keywords: Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Experiments with common powder laboratory apparatus are used to illustrate the problems of sampling a poorly mixed quantity of glass ballotini. The use of known and easily sieved mixtures permits the quantitative analysis of the results to show how bias in samples may be detected.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Particle and Particle Systems Characterization 1 (1984), S. 22-27 
    ISSN: 0934-0866
    Keywords: Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Process Engineering, Biotechnology, Nutrition Technology
    Notes: For some time studies have been made relating the values obtained from simple shape description to bulk powder properties. More recently the detailed mathematical description of particle outline has become possible and quite powerful techniques have been developed. These techniques may be used for the regeneration by computer of the shape and, more importantly, for studies relating shape to individual particle behaviour and to bulk powder properties. Quite inadequate attention has been directed to the task of obtaining from the laboratory sample of the bulk powder a representative sample of shapes without bias. In this communication the considerations to be included in the sampling procedure are reviewed and a possible solution to the problems posed is presented.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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