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  • 1
    Electronic Resource
    Electronic Resource
    Enhancement of spin correlations in ZnTe/MnTe superlattices by Cl doping (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 6460-6462 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of adding Cl impurity on the long-range antiferromagnetic coupling in [ZnTe|MnTe] magnetic semiconductor superlattices has been investigated by neutron diffraction. Superlattices consisting of five atomic planes of ZnTe alternated with ten atomic planes of MnTe[(ZnTe)5|(MnTe)10] have been prepared by molecular-beam epitaxy both with and without Cl added to the MnTe and/or ZnTe layers during deposition. This was motivated by the fact that Cl can form either shallow or deep donor levels in II–VI semiconductors, and that such electronic states can serve to modify magnetic interlayer exchange. Unchlorinated samples showed magnetic correlation lengths of around 225 Å ((approximate)5 bilayers) at low temperatures, and the addition of Cl increased the correlation length at 15 K by nearly a factor of 2 to approximately 450 Å. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372738
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  • 2
    Electronic Resource
    Electronic Resource
    Spin dynamics and absence of a central peak anomaly in La0.67Ca0.33MnO3 (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 5813-5815 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Low-angle inelastic neutron scattering was used to study the temperature and wave vector dependence of the spin waves in La0.67Ca0.33MnO3 perovskite-based colossal magnetoresistance material. At low q the spin waves show Heisenberg ferromagnetic dispersion (E=Dq2+Δ) where D is the spin stiffness, q is the wave vector, and Δ is the energy gap. However, the temperature renormalization of the spin stiffness D is anomalous, and as T increases toward Tc, D does not show the expected power law collapse, but rather exhibits a sudden sharp drop suggestive of a first-order phase transition. Detailed neutron measurements of the order parameter in zero applied field showed a similar first-order-like transition. However, no temperature hysteresis was observed in either D or in the magnetization. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372531
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  • 3
    Electronic Resource
    Electronic Resource
    A comparison of artificial and natural foods and their combinations in the rearing of goldfish, Carassius auratus (L.) (2003)
    Oxford, UK : Blackwell Science Ltd
    Aquaculture research 34 (2003), S. 0 
    Details
    ISSN: 1365-2109
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Intensive grow-out of goldfish, Carassius auratus (L.), larvae and juveniles in closed systems requires the control of environmental conditions and feeding. This study investigates the use of different types of live food and combinations of live food and dry food in a series of four rearing experiments. Juvenile goldfish can be weaned from Artemia onto live food at about 24 days after the onset of feeding without causing a reduction in growth and survival. The replacement of Artemia by Daphnia at day 10 appears feasible, as growth and survival were not significantly affected. Fish fed decapsulated Artemia cysts grew better than fish fed live Artemia. Within the first 14 days, goldfish juveniles should be fed at least 155 cysts per fish per day to achieve fast growth and to minimize size variation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2109.2003.00948.x
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  • 4
    Electronic Resource
    Electronic Resource
    Formalin-induced shrinkage in preserved goldfish (Carassius auratus L.) larvae (2004)
    Berlin, Germany : Blackwell Verlag GmbH
    Journal of applied ichthyology 20 (2004), S. 0 
    Details
    ISSN: 1439-0426
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0426.2004.00594.x
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of ration size and feeding frequency on growth, size distribution and survival of juvenile clownfish, Amphiprion percula (2003)
    Oxford, UK : Blackwell Verlag GmbH
    Journal of applied ichthyology 19 (2003), S. 0 
    Details
    ISSN: 1439-0426
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: This study describes the growth of juvenile clownfish, Amphiprion percula Lacépède 1802, fed with an artificial diet at six ration sizes of 2, 4, 6, 8, 10 and 12% of body mass per day (BM day−1) each at a feeding frequency of once, twice and three times per day. The effect of ration size on growth depended on the feeding frequency. In fish fed once a day growth did not improve above a ration size of 8% BM day−1. At two feedings per day fish required a ration size of at least 6% BM day−1 to achieve good growth, and fish fed three times per day grew at similar rates above a ration size of 4% BM day−1. A model to estimate the combined effect of ration size and feeding frequency is presented. The results lead to the suggestion of a simple length-based feeding regimen that could be tested in future studies on this species or adapted for use in other species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1439-0426.2003.00351.x
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  • 6
    Electronic Resource
    Electronic Resource
    Competition for attachment of aquaculture candidate probiotic and pathogenic bacteria on fish intestinal mucus (2004)
    Oxford, UK : Blackwell Science Ltd
    Journal of fish diseases 27 (2004), S. 0 
    Details
    ISSN: 1365-2761
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Probiotics for aquaculture are generally only selected by their ability to produce antimicrobial metabolites; however, attachment to intestinal mucus is important in order to remain within the gut of its host. Five candidate probiotics (AP1–AP5), isolated from the clownfish, Amphiprion percula (Lacepéde), were examined for their ability to attach to fish intestinal mucus and compete with two pathogens, Aeromonas hydrophila and Vibrio alginolyticus. Two different radioactive isotopes were used to quantify competition between pathogens and probionts. Attachment of the pathogens was enhanced by the presence of the candidate probiotics. However, the addition of the candidate probiotics after the pathogens resulted in reduced pathogen attachment. Only AP5 caused lower attachment success of V. alginolyticus when added before the pathogen. When AP5 was added first, the average attachment change was 41% compared with 72% when added after V. alginolyticus, suggesting that the probiotic is displaced but that enhanced attachment of the pathogen does not occur. Conversely, when V. alginolyticus was added first, followed by AP5, attachment change was 37% while AP5 had 92% attachment change when added second. This implies that the pathogen was displaced by the candidate probiotic and therefore it appeared that, based on the ability of probiont AP5 to attach to mucus, the growth of the pathogen in the digestive tract might be suppressed by the candidate probiont's presence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2761.2004.00542.x
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  • 7
    Electronic Resource
    Electronic Resource
    Die Polynomlösungen spezieller partieller Differentialgleichungen (1976)
    Springer
    Monatshefte für Mathematik 81 (1976), S. 109-117 
    Details
    ISSN: 1436-5081
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract One of the main problems in the theory of orthogonal polynomials in several variables is the determination of partial differential equations which have the given polynomials as their solutions. In this note, we consider partial differential equations which are two-dimensional generalizations of the classical differential equation for the Chebyshev polynomials in one variable and we will give conditions for its polynomial solutions. In addition, we will be able to determine all polynomials of a given class which are solutions of the partial differential equation under consideration. In the last section, we establish a connection between the different polynomial solutions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01301235
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  • 8
    Electronic Resource
    Electronic Resource
    Beispiele für die Anwendung und Grenzen aktualistischer Betrachtungsweise in der Geologie (1962)
    Springer
    Acta biotheoretica 14 (1962), S. 99-120 
    Details
    ISSN: 1572-8358
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Summary The theory of actualism is the most important in geological and palaeontological thinking. In this paper the historical development of this theory, its possibilities and boundaries are described and elucidated by geological and palaeontological examples.
    Notes: Zusammenfassung Nach der Problemumgrenzung (im ersten) werden im zweiten Abschnitt die Möglichkeiten der aktualistischen Methode behandelt. Zuerst werden Beispiele für die Anwendung der Methode auf vorwiegend geologischem Gebiet gebracht, gegliedert in exogene und endogene Vorgänge. Wegen der gleichzeitigen Bedeutung für Geologie und Paläontologie und Biologie schliesst sich eine Besprechung der Biostratonomie an. Der letzte Teil dieses Abschnittes behandelt ausgewählte Beispiele aus der Paläontologie. Der dritte Abschnitt schliesslich behandelt die Grenzen aktualistischer Betrachtungsmethode an Hand typischer Beispiele.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01556650
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  • 9
    Electronic Resource
    Electronic Resource
    Measurement of coherent neutron scattering lengths of gases (1979)
    Springer
    The European physical journal 291 (1979), S. 231-238 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract With the neutron interferometer, measurements of the coherent neutron scattering lengths by various gases have been performed. We get the following numbers for the bound coherent scattering lengths for atoms (in fm):b c (H) =−3.64(3),b c (D)=6.55(8),b c (He−3)=5.74(7),b c (He)=3.26(3),b c (N)=9.30(8),b c (O)=5.83(5),b c (Ne) =4.63(4),b c (Ar)=2.07(2),b c (Kr)=7.52(6),b c (Xe)=4.69(4). In some cases greater accuracy is achieved in comparison with recommended values from the literature. The absolute values for hydrogen and deuterium measured with gaseous samples, are about 2% smaller than the values measured with liquids and other reference values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01409188
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  • 10
    Electronic Resource
    Electronic Resource
    Die Messung der ungestörten Winkelkorrelation sukzessiver Kernstrahlungen in dünnen Aufdampfschichten (1962)
    Springer
    The European physical journal 166 (1962), S. 355-358 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Zusammenfassung Es wird gezeigt, daß die Kernquadrupolwechselwirkung angeregter Kernzustände mit den elektrischen Feldgradienten in dünnen Metallschichten kubischer Kristallstruktur verschwindet, wenn die Konzentration der gelösten Atome in der Träger-schicht klein ist. Durch Einbau von Indium in Bleischichten einer Dicke von 5·10−5 cm bis 3·10−4 cm konnte die ungestörte Winkelkorrelation von In111 gefunden werden. Die gemessene AnisotropieA=−(0,23±0,012) stimmt mit dem in flüssigen Quellen gefundenen Wert überein.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01380782
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