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  • Electronic Resource  (8)
  • 1990-1994  (3)
  • 1985-1989  (3)
  • 1965-1969  (2)
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  • Electronic Resource  (8)
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  • 1
    Electronic Resource
    Electronic Resource
    Magneto-optic images of flux distribution and creep in YBa2Cu3O7 (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 4409-4414 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A magneto-optic imaging technique was used to examine the flux distributions at 50, 60, and 70 K in a single-crystal platelet of YBa2Cu3O7. The superconducting sample was covered with a layer of iron garnet film, and a polarization microscope was used to examine the magnetic domains in this imaging film. Since the spacing of these domains was proportional to the local magnetic field in the underlying superconductor, it was possible to determine field profiles directly from the optical density of the image. Field profiles indicated that the distributions of remnant flux in the sample were well described by the critical state model. It was also possible, through the use of simple linear models of initial flux penetration, to measure the flux trapped in the sample as a function of time. The flux creep data derived from analysis of the digitized images showed a logarithmic decrease of magnetization with time, in good agreement with SQUID magnetometer measurements performed on the sample. There was no evidence of an axial critical state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349123
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Experiments concerning the connective nature of superconductivity in YBa2Cu3O7 (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 3308-3313 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Samples of YBa2Cu3O7 have been prepared with rather sharp inductive transitions having in the best cases breadths of 7 K and midpoint Tc values of 88 K. The resistive Tc midpoints are 92–95 K with transition widths of ±1–2 K. Flux shielding at 4.2 K is normally 100% and flux expulsion at 4.2 K reaches 95%. However, even small fields of order 1 mT decouple some 15%–20% of the volume, allowing flux to enter the samples. Resistive Hc2 measurements suggest that Hc2(0) varies from 〈1 to 〉300 T, depending on the criterion chosen. ac susceptibility measurements suggest that Hc2(0) is ∼60 T. Magnetization current densities are relatively high (150–200 A/mm2 at 1–10 T at 4.2 K) but measured transport current densities are small (≤1 A/mm2). Magnetization current densities at 77 K are about two orders of magnitude lower. The samples were seen to be heavily twinned by light microscopy (scale of 1–5 μm) and by transmission electron microscopy (scale of ∼250 nm). It is concluded that these measurements are consistent with a model of superconducting regions of reduced dimensionality coupled by tunneling.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339339
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Interactions of Astroglia-Derived Factors with Hippocampal Neurons (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 540 (1988), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1988.tb27120.x
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  • 4
    Electronic Resource
    Electronic Resource
    Synthesis and structural characterization of the platinum complex, cis-[(Cy2PCH2CH2PCy2)(NP)PtGa(NP)2 (Cy = cyclohexyl; NP = neopentyl) (1990)
    s.l. : American Chemical Society
    Inorganic chemistry 29 (1990), S. 1601-1602 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic00334a004
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  • 5
    Electronic Resource
    Electronic Resource
    Routine rheological tests in the British food industry (1969)
    Oxford, UK : Blackwell Publishing Ltd
    International journal of food science & technology 4 (1969), S. 0 
    Details
    ISSN: 1365-2621
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1969.tb01500.x
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    The evolution of the brabender farinograph (1969)
    Springer
    Rheologica acta 8 (1969), S. 243-243 
    Details
    ISSN: 1435-1528
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract The importance of the consistency of wheat flour dough in baking is defined. This is normally determined with the aid of a recording dough mixer. Such a mixer was first patented byHogarth, a Scottish miller in 1889 but proved inadequate. About 40 years laterHankóczy a Hungarian cereal chemist initiated the line of recording dough mixers which are used today. His andBrabender's work are reviewed which led from a factory mixer fitted with an ammeter, via the early torque recording laboratory instruments to the modern Farinograph. The basic unit is described in some detail. Slides of the various attachments are shown which allow application to grinding and high speed mixing both on a batch and continuous basis. The use of the system for the testing of cereal products, fats, rubber, filler and plastics is described. The theoretical significance of the results obtained is briefly discussed. The lecture is illustrated by 14 slides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01984669
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  • 7
    Electronic Resource
    Electronic Resource
    Undergraduate teaching of food rheology at the University of Leeds (1985)
    Springer
    Rheologica acta 24 (1985), S. 438-440 
    Details
    ISSN: 1435-1528
    Keywords: Food rheology ; teaching
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract The basic food science course at Leeds University takes four years and leads to the degree of B.Sc. Since entrants have variable mathematical ability the food rheology course is divided into a basic non-mathematical course for all students in the second year and a mathematical component for selected students only, in the fourth. Courses are kept up to date by a study of the literature, and the circulation of questionnaires to the British Food Industry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01333971
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  • 8
    Electronic Resource
    Electronic Resource
    1H-NMR imaging of fimbria fornix lesions in the rat brain (1992)
    Springer
    Brain topography 5 (1992), S. 147-151 
    Details
    ISSN: 1573-6792
    Keywords: 1H-NMR imaging ; (Rat) brain ; Fimbria fornix ; Hippocampus ; Ventricle
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Mechanical lesions of the fimbria fornix (FF) have been widely used as a model to investigate the recovery of damaged brain tissue.1H-NMR imaging was employed to non-invasively measure changes in the brain after unilateral FF transection. Rats were subjected to NMR imaging at various times after the lesions were made. The experimental protocol included (multislice) T2-weighted and diffusion-weighted imaging thereby allowing the construction of two-dimensional maps of the relaxation time T2 (transverse or spin-spin relaxation time) and the apparent diffusion coefficient (ADC) of water. FF transection induced considerable changes in the status of the brain tissue at a number of different locations which were exclusively present in the affected hemisphere. At 1 day post-lesion the region of the lateral ventricle and hippocampus started to display pronounced changes in that T2- and diffusion-weighted images showed a hyperintensity and a hypointensity, respectively. These effects were maximal around day 2 to 4 whereafter a slow recovery towards the control situation was observed. Immediately after transection the FF lesion itself could be visualized. These early images pointed to an aspecific disruption of the tissue due to the mechanical intervention. Interestingly, however, from day 2 post-lesion a number of changes became evident in this region which seemed to be localized to specific structures, including the ventricle and hippocampus. After one month the presumably ventricular effect dominated and was predominantly localized to the anterior side of the FF lesion. These findings are indicative of pronounced changes in the status of water (e.g., in its distribution between extra- and intracellular compartments) at a number of locations distant from the site of FF transection. The mechanism by which these changes are brought about and the origin of their time-dependence remain to be elucidated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01129042
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    Paper (German National Licenses)
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