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  • Electronic Resource  (26)
  • 1985-1989  (18)
  • 1960-1964  (8)
  • 1
    Electronic Resource
    Electronic Resource
    Diffusion of ion-implanted Sn and Sb in heavily doped n-type silicon (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 755-757 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The diffusion of ion-implanted Sn and Sb in silicon single crystals during rapid thermal annealing at 1000 and 1050 °C has been studied as a function of P donor concentration. For extrinsic/intrinsic carrier concentration ratios (n/ni )≥20, almost identical, extremely large diffusion coefficients are found for both impurities. The diffusion coefficients exhibit approximately an (n/ni )4 dependence. The onset of this dependence is accompanied by the appearance of a new defect-complex type containing Sb or Sn, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.99823
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Properties of sputtered superconducting films of Bi2Sr2CaCu2Ox made by low-temperature in situ growth (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 2135-2137 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Superconducting films of Bi2Sr2CaCu2Ox have been fabricated on single-crystal MgO substrates by a low-temperature in situ process. Using a substrate temperature Ts≈645 °C, metallic films with a superconducting onset of 90–100 K and an extrapolated Tc0=56 K have been obtained. X-ray diffraction shows the films to be c-axis oriented. Electron microscopy reveals that the films are not significantly smoother than films which were post-annealed at 865 °C, and that some segregation into nonsuperconducting phases had occurred. The exact mechanism by which crystallization and superconductivity occurs at such low temperatures is not yet known, but it can be speculated that the surface atoms are less constrained and thus have a smaller energy barrier to overcome in forming a crystal structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.102347
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Occurrence of Aspergillus umbrosus Antibodies in Danish Farmers (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Allergy 41 (1986), S. 0 
    Details
    ISSN: 1398-9995
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Antibodies to Aspergillus umbrosus were investigated in 181 Danish farmers, 137 farmers spouses and a control group of 104 male blood donors with no relation to farming. By enzyme-linked immunosorbent assay (ELISA) higher levels of IgG antibodies were found in farmers than in their spouses and in non-farming controls (P 〈 0.0001). By double immunodiffusion precipitating antibodies occurred in 11 farmers, in none of farmers' spouses and in one control subject. Farmers and farmers' spouses who were non-smokers had higher IgG antibody levels than smokers in the same groups (P 〈 0.04). Farmers more than 30 years of age had higher IgG antibody levels than younger farmers (P 〈 0.04). Farmers rearing cattle tended to have higher IgG antibody levels than farmers without cattle. No correlation between antibody levels and respiratory symptoms or lung function parameters (FEV1 or FVC) could be demonstrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1398-9995.1986.tb00285.x
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Simulation of a Neuronal Network operating Rhythmically through Recurrent Inhibition (1964)
    [s.l.] : Nature Publishing Group
    Nature 204 (1964), S. 289-290 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The theory has been tested by simulation of a neuronal network on a digital computer, IBM 1620. Eighty neurones were made to discharge randomly, all at a given probability of firing (PF) (Fig. IA). Following the discharge of any cell, up to five other neurones were subjected to a drop of their PF ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/204289a0
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  • 5
    Electronic Resource
    Electronic Resource
    Inhibitory Phasing of Neuronal Discharge (1962)
    [s.l.] : Nature Publishing Group
    Nature 196 (1962), S. 645-647 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SEVERAL large aggregations of neurones in the central nervous system exhibit a tendency to synchronize responses which recur at relatively slow frequencies. The best-known example is the alpha rhythm which occurs in various areas of the cerebral cortex, neuronal discharges tending to occur in phase ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/196645a0
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  • 6
    Electronic Resource
    Electronic Resource
    Hippocampus of the Brain: Recurrent Inhibition in the Hippocampus with Identification of the Inhibitory Cell and its Synapses (1963)
    [s.l.] : Nature Publishing Group
    Nature 198 (1963), S. 540-542 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN an investigation of cortical functions the simple structure of the hippocampus offers great advantages1 over other cortical regions, particularly as its detailed histology is better known2-5. A special feature of the hippocampal cortex is that, within a given area, the fibres of a certain ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/198540a0
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Inhibitory Synapses on Somas of Purkinje Cells in the Cerebellum (1963)
    [s.l.] : Nature Publishing Group
    Nature 199 (1963), S. 655-656 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN the hippocampal cortex a very powerful postsynaptic inhibition is produced by synapses concentrated on the sonias of the pyramidal cells; hence it has been concluded that these synapses belong to the basket cells, which have extensive axon ramifications that terminate exclusively on the cell ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/199655a0
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  • 8
    Electronic Resource
    Electronic Resource
    Presynaptic Inhibitory Actions: Presynaptic Inhibition in the Cuneate Nucleus (1962)
    [s.l.] : Nature Publishing Group
    Nature 194 (1962), S. 741-743 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN the pathway from cutaneous nerves to the sensory cortex a conditioning volley is followed by a deep and prolonged (about 150 msec.) depression of the primary cortical response evoked by a testing volley in the same nerve or in another nerve of that limb1-4. Much of the depression has been shown ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/194741a0
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  • 9
    Electronic Resource
    Electronic Resource
    Acetylcholine: a Central Transmitter? (1962)
    [s.l.] : Nature Publishing Group
    Nature 195 (1962), S. 1105-1106 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] This communication is concerned with the excitatory effect of acetylcholine on neurones in the ventrobasal complex of the thalamus of cats anaesthetized with sodium pentobarbital. Extracellular action potentials (0-2-1-0 mV) were recorded by means of the central barrel of five-barrel ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1951105a0
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    A precise multipass method for satellite Doppler positioning (1988)
    Springer
    Celestial mechanics and dynamical astronomy 44 (1988), S. 317-338 
    Details
    ISSN: 1572-9478
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A precise and efficient algorithm is developed for determining the locations of radio beacons (e.g. of the ARGOS or COSPAS/SARSAT type) based on Doppler shift measurements in overflying satellites. The method distinguishes itself through: (1) the use of a very compact analytic orbital theory valid for all eccentricities, (2) autonomous orbit improvement based on Doppler data for one or more local reference beacons accessible at a single LUT, (3) simultaneous orbit improvement and calculation of beacon coordinates for an arbitrary number of satellites, satellite passes, and beacons, and (4) very efficient semi-analytic matrix inversion by partitioning into global, semi-global, and local parameters. The algorithm has been implemented in a FORTRAN program which can be run on a PC. Error statistics are presented from applications of the program to a large number of actual Doppler curves obtained with the ARGOS and COSPAS/SARSAT systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01234271
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