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  • 2000-2004
  • 1985-1989  (7)
  • 1989  (7)
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Material
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  • 2000-2004
  • 1985-1989  (7)
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Bioactivity of the Essential Oil of Bupleurum fruticosum (1989)
    s.l. : American Chemical Society
    Journal of natural products 52 (1989), S. 267-272 
    Details
    ISSN: 1520-6025
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/np50062a008
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Optical properties of epitaxial CoSi2 and NiSi2 films on silicon (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 2738-2741 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have measured the optical constants of epitaxial films of CoSi2 and NiSi2, grown by molecular beam epitaxy on Si(111), in the energy range of 0.9–4.0 eV. The behavior of the optical constants is characteristic of metals: Drudelike in the low energy region and deviating from Drude behavior as interband transitions set in. Interband transitions are found to have already set in at 1 eV. The absorption varies significantly with energy, which has implications for photoresponse studies of internal photoemission in these material systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344217
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    0.8 eV excitation of the quenched EL2* level in semi-insulating GaAs (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 2221-2222 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Excitation with 0.8 eV of the optically bleached state of semi-insulating GaAs results in a recovery of the 1–1.3 eV photocurrent. This recovery is found to occur in the advanced stages of the photoquenching with 1.1-eV light, when both the extrinsic and the intrinsic photocurrent are quenched. Such an observation is related to the existence of different metastable configurations, which are characterized by different optical sensitivities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344274
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    The trans-cerebral veins: normal and non-pathologic angiographic aspects (1989)
    Springer
    Surgical and radiologic anatomy 11 (1989), S. 63-72 
    Details
    ISSN: 1279-8517
    Keywords: Cerebral v ; Arteriovenous malformations ; Trans-cerebral circulation ; Angiography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumés Les v. trans-cérébrales sont décrites depuis longtemps, mais leur fonctionnement et leur dysfonctionnement sont peu ou pas connus. Elles sont le siège d'échanges fondamentaux sur un mode unique dans l'organisme: la barrière hémato-encéphalique. Architecturalement on distingue 2 systèmes: le système veineux drainant la substance blanche et le système anastomotique trans-cérébral. Le premier semble lié à des fonctions de nutrition et de drainage du parenchyme; les anomalies veineuses de développement constituent des variations anatomiques qui le rendent angiographiquement visible. Le système anastomotique trans-cérébral ventriculo-cortical semble prédisposé à la régulation de la résorption du liquide céphalo-rachidien; il n'est visible que dans des situations exceptionnelles associant une augmentation de débit (shunt artério-veineux) à des obstacles veineux des voies habituelles de drainage et de circulation collatérale. Il est mis à contribution, le plus souvent dans le sens ventriculo-cortical. Aucun dysfonctionnement spécifique de ce système n'est actuellement connu.
    Notes: Summary The trans-cerebral v. have long been described, but there is little or no knowledge of their function and dysfunction. They are the site of fundamental interchange across the blood-brain barrier, a unique process within the organism. Two systems can be structurally distinguished: the venous system draining the white matter and the trans-cerebral anastomotic system. The former seems to be associated with the nutrition and drainage of the parenchyma, and is rendered visible at angiography by anatomic variations based on developmental venous anomalies. The anastamotic trans-cerebral ventriculo-cortical system seems concerned with the regulation of reabsorption of the cerebrospinal fluid. It is visualized only in exceptional situations where an increased flow (arteriovenous shunt) is combined with obstruction of the normal routes of venous drainage and collateral circulation. It usually functions in the ventriculo-cortical direction. No specific dysfunction of this system is currently recognized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02102249
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Les veines trans-cérébrales: aspect angiographique normal et anormal (1989)
    Springer
    Surgical and radiologic anatomy 11 (1989), S. 17-19 
    Details
    ISSN: 1279-8517
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Conclusion De nombreuses incertitudes persistent quant au fonctionnement normal et aux maladies spécifiques de chacun des deux systèmes (si elles existent). La bonne connaissance de cette vascularisation permet de ne pas considérer comme néo-vascularisations des structures vasculaires pré-existantes, recrutées dans des situations exceptionnelles complexes. Dans un certain nombre de cas, leur hypertrophie normale s'est avérée réversible. Elles ne justifient d'aucune thérapeutique particulière a priori et doivent être considérées lorsqu'elles sont visibles comme témoignant de la flexibilité anatomique exceptionnelle de ce système.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02177375
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    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Space charge relaxation in high density polyethylene (HD-PE) (1989)
    Springer
    Journal of materials science 24 (1989), S. 1323-1326 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A general order kinetics approach has been used to study the space-charge relaxation in highdensity polyethylene (HD-PE). The analysis of the activation energy,E, and the kinetics order,q, allows the determination of two relaxation regions above the glass transition temperature; one between −24 and 16° C, and a second above 16° C. Both relaxations are discussed on the basis of the structural characteristics of polyethylene.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02397066
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Space charge relaxation in high density polyethylene (HD-PE) (1989)
    Springer
    Journal of materials science 24 (1989), S. 1323-1326 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A general order kinetics approach has been used to study the space-charge relaxation in highdensity polyethylene (HD-PE). The analysis of the activation energy,E, and the kinetics order,q, allows the determination of two relaxation regions above the glass transition temperature; one between −24 and 16° C, and a second above 16° C. Both relaxations are discussed on the basis of the structural characteristics of polyethylene.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00553161
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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