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  • 1990-1994  (11)
  • 1970-1974
  • 1960-1964
  • 1993  (11)
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  • 1990-1994  (11)
  • 1970-1974
  • 1960-1964
Year
  • 1
    Electronic Resource
    Electronic Resource
    Properties of transit-time interactions in magnetized plasmas: Analytic and numerical results (1993)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 5 (1993), S. 2751-2763 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The recently developed perturbation theory of transit-time interactions between particles and coherent wave packets in magnetized plasmas is applied to particular field structures. Limits of validity are determined by comparison with test-particle simulations, showing that the theory is accurate everywhere except near certain well-determined resonances, for wave fields exceeding a characteristic threshold, and for particles below a particular velocity. The properties of transit-time interactions in magnetized plasmas are investigated in detail to determine their dependence on the fields and parameters of the particle motion. Resonant particle scattering is found to occur at low particle velocities when the frequency of the coherent wave packet is an integer multiple of the gyrofrequency. Two different types of resonant transit-time dissipation are also observed: one arises from transient cyclotron acceleration in the localized wave packet, the other from beating between the gyration of the particles and the oscillation of the wave packet field. Both effects involve an interplay between the field geometry and resonant oscillations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860716
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Transit-time interactions in magnetized plasmas (1993)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 5 (1993), S. 1045-1056 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The theory of transit-time interactions between particles and coherent wave packets is generalized to include the effects of ambient and induced magnetic fields. Using a Born approximation, the wave–particle energy transfer is calculated analytically to second order in the perturbing fields, which is sufficient to treat both particle scattering and wave damping. The results possess the correct unmagnetized limit, and can be approximated in a simple form in the small gyroradius regime.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860951
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Postpartum meningitis (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Anaesthesia 48 (1993), S. 0 
    Details
    ISSN: 1365-2044
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: A case of meningitis following obstetric epidural anaesthesia is reported in which a group B, beta-haemolytic streptococcus was isolated as the causative organism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2044.1993.tb07592.x
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The metabolic and hormonal response to cataract surgery (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Anaesthesia 48 (1993), S. 0 
    Details
    ISSN: 1365-2044
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: We studied the metabolic and hormonal responses of 30 elderly patients undergoing routine cataract surgery who were allocated randomly to receive either general anaesthesia, or local anaesthesia by means of either retrobulbar or peribulbar blockade. Both forms of local anaesthesia successfully prevented the increases in circulating cortisol and glucose concentrations seen in those patients who received general anaesthesia, there being no significant differences between retrobulbar and peribulbar blockade. The results show that the newer, and now more commonly performed peribulbar block, confers the same metabolic and hormonal stability as seen with the more traditional retrobulbar block.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2044.1993.tb07067.x
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Discrimination of parakeratinised odontogenic keratocysts from other odontogenic and non-odontogenic cyst types by expression of a 38kd cell-surface glycoprotein (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral pathology & medicine 22 (1993), S. 0 
    Details
    ISSN: 1600-0714
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: We have identified strong expression of a 38-kD cell surface glycoprotein (gp38), a marker of basal cell carcinomas (BCCs), in basal and suprabasal epithelial cell membranes of parakeratinised odontogenic keratocysts. In contrast, orthokeratinised cysts and most other odontogenic cyst types, ameloblastomas, normal stratified oral epithelium, cell rests of Malassez and glands of Serres, all proved negative. To our knowledge this is the first histochemical marker to distinguish between these major cyst types. It has obvious uses in the diagnosis of inflamed keratocysts and the separation of ameloblastomas from BCCs and may find a role in studies of the developmental biology of other odontogenic structures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0714.1993.tb01090.x
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  • 6
    Electronic Resource
    Electronic Resource
    (4S,5S)-4-Methyl-5-phenyl-1,3-oxazolidin-2-one (1993)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 49 (1993), S. 1238-1240 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270192013477
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    A new PLLA/PCL copolymer for nerve regeneration (1993)
    Springer
    Journal of materials science 4 (1993), S. 521-525 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: The aim of this study is to evaluate the functional and cell biological applicability of a two-ply nerve guide constructed of a PLLA/PCL (i.e. poly-l-lactide and poly-ε-caprolactone) copolymer. To do so, we performed a cytotoxicity test, a subcutaneous biodegradation test and an in situ implantation study in the sciatic nerve of the rat. The nerve guide copolymer was found to be non-toxic, according to ISO/EN standards, and it showed a mild foreign body reaction and complete fibrous encapsulation after implantation. Onset of biodegradation of the inner layer was seen after one month of implantation. After 18 months of implantation complete fragmentation was observed, as well as a secondary inflammatory response characterized by foreign body giant cell activity and phagocytosis of polymer debris. Recovery of both motor and sensory nerve function was observed in all nerve guides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00120133
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  • 8
    Electronic Resource
    Electronic Resource
    Note on the reflexion of water waves at a nearly vertical cliff in the presence of surface tension (1993)
    Springer
    Flow, turbulence and combustion 51 (1993), S. 599-609 
    Details
    ISSN: 1573-1987
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract In this note the two-dimensional problem of incoming surface waves against an approximately vertical wall or cliff in water of infinite depth is examined, using velocity potential formulation and linearized boundary-value problem theory for time-harmonic motion. The cliff has arbitrary profile but for simplicity is taken to be vertical at the free surface. The approximate first-order solution is determined subject to a dynamical edge condition apposite to the presence of surface tension, and contains partially reflected outgoing waves. The solution is obtained by perturbation theory in a form involving known unperturbed and first-order correction potentials that is applicable also to water of finite constant depth. The motivation for the note is to point out a correction in principle to the results of a recent investigation for a specific profile, in which reflexion is ignored and another error made in obtaining a first-order solution by a method that is restricted to infinite depth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00868002
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Stochastic-growth theory of Langmuir growth-rate fluctuations in type III solar radio sources (1993)
    Springer
    Solar physics 146 (1993), S. 357-363 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Fluctuations in type III beams are produced by quasilinear interactions with clumpy Langmuir waves in type III radio sources. The properties of these fluctuations are estimated and shown to yield Langmuir growth rates and growth-rate fluctuations consistent with those required by the recent stochastic-growth theory of type III radio bursts, with observations, and with existing theoretical constraints. This strengthens the basis of stochastic-growth theory and provides an essential consistency test for this model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00662019
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Propagation and absorption of cyclotron maser radiation in solar microwave spike bursts (1993)
    Springer
    Solar physics 145 (1993), S. 317-338 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract It has been argued that the loss-cone-driven electron cyclotron maser instability can account for the properties of millisecond microwave spike bursts observed during some solar flares. However, as it propagates outward from the corona, maser radiation undergoes gyroresonance absorption when its frequency is a harmonic of the local electron-cyclotron frequency. Existing analytical models using slab geometries predict that this absorption should be sufficiently strong to prevent the radiation from being seen at the observed levels, except under highly restrictive conditions or for unrealistic plasma parameters. A more comprehensive analysis is presented here to determine if and when maser radiation can escape to produce microwave spike bursts. This analysis employs numerical raytracing and incorporates propagation and absorption of fundamental maser emission in a realistic model of a coronal flux loop. It is found that ranges of physical conditions do exist under which maser radiation can escape to an observer and that these conditions are much more limiting for fundamental emission in the extraordinary (χ)-mode than in the ordinary (o)-mode. Detailed investigation implies that escaping radiation in the χ-mode is highly directional and chiefly observable toward the center of the solar disk, while escapingo-mode radiation is found to emerge from the corona over a much wider range of directions, with some cases corresponding to radiation observable near the solar limb.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00690659
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