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  • 1
    facet.materialart.
    Unknown
    Krefeld
    Associated volumes
    Call number: K 96.0056
    In: Geologische Karte von Nordrhein-Westfalen
    Pages: 1 Kt. + Erl.-H. (68 S.)
    Branch Library: GFZ Library
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  • 2
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Summary In this work, we describe a new apparatus, destined to register the activity of small, or very small insects. We use an électrical photo cell. The traffic of insects, cut the very narrow light bundle, wich is focussed in the middle part of the electrical photo cell. The passage of insects gives impulses wich are magnified, counted, and finally inscribed on a paper sheet. The electrical photo cell is very sensitive in the red and infra-red. So, all visibles radiations are suppressed, and we use a very little brush of infra-red rays. The most important advantages of this apparatus are: to be very simple, and very easy to handle. We can study easily, the activity of the smallest insects (1 or 2 mm), and the activity of social insects. We can also study the action of climatory factors on the activity. The insects in experiments, wich are living in thier own nest, are never disturbed.
    Notes: Résumé Le présent travail a pour objet la description d'un nouveau type d'actographe destiné à l'enregistrement de l'activité de petits insectes. Nous utilisons un montage réalisé avec une cellule photo-électrique. Le passage d'un insecte interrompt le faisceau lumineux très étroit, centré sur la cellule. Il en résulte une impulsion qui est amplifiée, puis comptée, et inserited. La cellule est très sensible dans le rouge et l'infrarouge. On peut donc, sans inconvénients, arrêter toutes les radiations visibles, et travailler avec un fin pinceau de rayons infrarouges invisibles. Outre sa très grande sensibilité, et sa maniabilité, cet appareil se connecte très facilement à n'importe quel nid dont on désire étudier l'activité, sans que les insectes en expérience soient perturbés (puisqu'ils restent dans leur propre nid). Il permet d'étudier l'activité d'insectes isolés d'une longueur voisine de 1 à 2 mm, d'insectes sociaux, et de préciser l'action des facteurs du milieu sur l'activité.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 3309-3311 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Huge gain values (〉107) are evidenced in parametric amplification of infrared subpicosecond pulses using two successive organic N-(4-nitrophenyl)-L-prolinol crystals acting as parametric amplifiers. Temporal analysis of parametric emission in the first crystal is performed in the second one. Application to the detection of long-wavelength pulses (〉1.6 μm) is demonstrated with a high temporal resolution.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Nuclear and Particle Science 38 (1988), S. 119-159 
    ISSN: 0163-8998
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 8 (1960), S. 0 
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: The practical use of synthetic records involves previous studies on field records from an original point of view; these studies consist essentially in analysing and cancelling noise, in bringing out the form of pulses and the character of seismic events, in detecting multiple arrivals. Various tools have been tested for this purpose: high multiplicity shooting, analysis of conventional well velocity surveys, mixing or selecting traces, varied filters; all these operations are facilitated by the use of magnetic recording.After several examples of these methods are given, it is shown how the results of such studies can help to make and discuss synthetic records with and without multiples. The share of multiple events and their effect on the efficiency of the later comparisons are especially treated.The authors finally present some specific examples of successful comparisons between synthetic records and field records treated beforehand. They insist on the discrepancies and on the importance of finding their origin, for the most tangible results in seismic interpretation generally appear during the analysis of such discrepancies.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 2251-2253 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Second-harmonic generation was observed in a 7-mm-thick 3-methyl-4-nitropyridine-1-oxide crystal at the 1.32 and 1.34 μm emission lines of a Q-switched, mode-locked Nd3+:YAG laser, emitting short pulses of duration of 160 ps. A remarkably high effective conversion rate of 50% was measured by pump depletion in a type-I phase-matched configuration.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 444 (1985), S. 0 
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 16 (1960), S. 149-149 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Résumé La ribonucléase exerce une action inhibitrice sur le clivage des œufs d'oursins. La source commerciale de l'enzyme, la concentration utilisée et l'état des œufs déterminent les effets obtenus. Ceux-ci varient entre une inhibition totale immédiate et un ralentissement des divisions cellulaires, suivi d'un développement anormal éventuellement abortif. En outre, la ribonucléase a une action complexe sur la membrane de fertilisation, la couche hyaline et la membrane cellulaire. Cette dernière action pourrait être liée aux effets antimitotiques observés.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Probability theory and related fields 74 (1987), S. 319-340 
    ISSN: 1432-2064
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary IfX takes values in a Banach spaceB and is in the domain of attraction of a Gaussian law onB, thenX satisfies the compact law of the iterated logarithm (LIL) with respect to a regular normalizing sequence {γ n } iffX satisfies a certain integrability condition. The integrability condition is equivalent to the fact that the maximal term of the sample {‖X 1‖, ‖X 2‖,..., ‖X n‖} does not dominate the partial sums {S n}, and here we examine the precise influence of these maximal terms and its relation to the compactLIL. In particular, it is shown that if one deletes enough of the maximal terms there is always a compactLIL with non-trivial limit set.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Probability theory and related fields 74 (1987), S. 341-355 
    ISSN: 1432-2064
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary We examine the central limit theorem with Gaussian limit law for a sequence of independent, identically distributed, vector valued random variables whose partial sums can be centered and normalized to be tight with non-degenerate limit laws. These results apply to the situation when the sequence is in the domain of attraction of a non-degenerate stable law of indexp∈(0,2], and are achieved by eliminating the extreme values from the partial sums.
    Type of Medium: Electronic Resource
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