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  • 1990-1994  (126)
  • 1965-1969  (13)
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  • 1
    Electronic Resource
    Electronic Resource
    Capillary condensation of xenon on exfoliated graphite (1990)
    s.l. : American Chemical Society
    Langmuir 6 (1990), S. 1417-1421 
    Details
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/la00098a016
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  • 2
    Electronic Resource
    Electronic Resource
    Simulation study on dynamics transition in neuronal activity during sleep cycle by using asynchronous and symmetry neural network model (1990)
    Springer
    Biological cybernetics 63 (1990), S. 243-250 
    Details
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract We have found that single neuronal activities in different regions in the brain commonly exhibit the distinct dynamics transition during sleep-waking cycle in cats. Especially, power spectral densities of single neuronal activities change their profiles from the white to the 1/f along with sleep cycle from slow wave sleep (SWS) to paradoxical sleep (PS). Each region has different neural network structure and physiological function. This suggests a globally working mechanism may be underlying the dynamics transition we concern. Pharmacological studies have shown that a change in a wide-spread serotonergic input to these regions possibly causes the neuronal dynamics transition during sleep cycle. In this paper, based on these experimental results, an asynchronous and symmetry neural network model including inhibitory input, which represents the role of the serotonergic system, is utilized to examine the reality of our idea that the inhibitory input level varying during sleep cycle induce that transition. Simulation results show that the globally applied inhibitory input can control the dynamics of single neuronal state evolution in the artificial neural network: 1/f-like power spectral density profiles result under weak inhibition, which possibly corresponds to PS, and white profiles under strong inhibition, which possibly corresponds to SWS. An asynchronous neural network is known to change its state according to its energy function. The geometrical structure of network energy function is thought to vary along with the change in inhibitory level, which is expected to cause the dynamics transition of neuronal state evolution in the network model. These simulation results support the possibility that the serotonergic system is essential for the dynamics transition of single neuronal activities during sleep cycle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00203447
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  • 3
    Electronic Resource
    Electronic Resource
    Further study on 1/f fluctuations observed in central single neurons during REM sleep (1993)
    Springer
    Biological cybernetics 68 (1993), S. 193-198 
    Details
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract Recently, 1/f fluctuations have been discovered in the single-unit activity of mesencephalic reticular formation (MRF) neurons during REM sleep. In a previous paper, such behavior could satisfyingly be interpreted on the basis of the clustering Poisson process. The question of applicability of this model to other MRF neurons remained unanswered. The present paper reports on 1/f fluctuations in 12 MRF neurons all of which can satisfyingly be modeled by the clustering Poisson process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00224851
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  • 4
    Electronic Resource
    Electronic Resource
    Counting statistics of 1/f fluctuations in neuronal spike trains (1990)
    Springer
    Biological cybernetics 62 (1990), S. 407-413 
    Details
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract The mesencephalic reticular formation (MRF) neurons are regarded as contributing to the activation of the celebral cortex. In this paper, the statistical features of single neuronal activities in MRF of cat during dream sleep are investigated; the neuronal spike train exhibits 1/f fluctuations. Counting statistics is applied to the neuronal spike train giving rise to a variance/mean curve which follows at μ-law. For an interpretation of these findings, the clustering Poisson process is applied which not only gives rise to at μ-law but also suggests a generation mechanism. The MRF neuronal activities are closely fitted by the clustering Poisson process and the underlying statistical parameters can be estimated. These findings strongly suggest that neuronal activities can be interpreted as superposition of randomly occuring clusters ( = bursts of spikes).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00197647
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  • 5
    Electronic Resource
    Electronic Resource
    Magneto-optic spectra of the A 2Σ+–X 2Πi transition of OH (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 176-182 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We investigated the resonant magneto-optic spectra of the electronic band A 2Σ+–X 2Πi of the OH radical. The theoretical analysis was made under the condition that OH radicals were subjected to an externally applied magnetic field, which was oriented in a direction longitudinal (the Faraday configuration) or transverse (the Voigt configuration) to the optical path. Light interacting with the OH radicals was assumed to be elliptically polarized. The polarization change caused by the magnetically induced optical anisotropy of the OH radical was calculated as a function of the frequency and the ellipticity of the incident light, the orientation of the polarization analyzer, and the number density of the OH radicals. Experiments were carried out in the Voigt configuration using a narrow-band tunable dye laser as a light source. The observed profiles of the Voigt-effect signal for the rotational lines of the various branches agreed with theoretical predictions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459589
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  • 6
    Electronic Resource
    Electronic Resource
    Ten-Year Changes of Protease Inhibitors in the Sons of Patients with COPD (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 624 (1991), 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.1749-6632.1991.tb17049.x
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  • 7
    Electronic Resource
    Electronic Resource
    Sterols from the Fruit and Seed of Tomato (1967)
    [s.l.] : Nature Publishing Group
    Nature 213 (1967), S. 799-800 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In the early stages of carotenoid and sterol synthesis, intermediates are the same, available to both unless different sites are involved. We were therefore interested to determine whether some of the numerous genes affecting carotenoid production would likewise affect the sterols. So far as we are ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/213799a0
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  • 8
    Electronic Resource
    Electronic Resource
    Electrical transport properties and confinement potential analysis of buried AlGaAs/GaAs quantum wires (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 2330-2335 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Buried wires with lateral potential barriers provided by AlGaAs/GaAs heterointerfaces have been fabricated by wet etching and metalorganic chemical vapor deposition regrowth. Burying the wire was proven to enhance the electrical transport properties; for example, it decreased the critical width and increased the subband energy separation. Two-dimensional simulation using the Poisson equation was performed to obtain the potential profile of both as-etched and buried wires. The quantum energy levels corresponding to the lateral confinement were calculated for the obtained potential profiles. The calculated energy separations agreed well with the experimental ones and the subband energy separation of the buried wire was larger than that of the as-etched wire for the same effective width. These results show that burying wire is effective for creating strong lateral confinement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357605
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  • 9
    Electronic Resource
    Electronic Resource
    Polyphase eddy current testing : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 5904-5906 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Polyphase eddy current testing is proposed. The operating principle of this system is as follows. The polyphase eddy current testing system may be regarded as one of the polyphase transformers. Primary balanced polyphase coils are star connected and secondary polyphase circuits are composed of the target. When balanced polyphase currents are fed into the primary coils, zero phase voltage is detected if the target has defects. No zero phase voltage is detected if the target has no defects. It is found that this method has a higher sensitivity compared with that of conventional eddy current testing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355557
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  • 10
    Electronic Resource
    Electronic Resource
    Soft x-ray multilayer phase shifter : Proceedings of the 4th international conference on synchrotron radiation instrumentation (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 1510-1512 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Phase shift versus incident angle characteristics of soft x-ray multilayer mirrors have been studied for the first time by rotating analyzer ellipsometry at 97 eV photon energy. Synchrotron radiation was used as a linear polarization source and a multilayer polarizer of 97% polarizance was used as the analyzer. By the reflection at two multilayers mounted in the double crystal configuration, circular polarization was produced. This confirmed a total phase shift of 90° and proved the usefulness of the multilayer as a phase shifter for polarization evaluation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143007
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