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  • 2005-2009  (1)
  • 1985-1989  (6)
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  • 1
    Electronic Resource
    Electronic Resource
    A millimeter and submillimeter wavelength free-electron laser (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 1511-1518 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Measurements of millimeter and submillimeter wavelength emission (240 GHz〈ω/2π〈470 GHz) from a free-electron laser are reported. The laser operates as a superradiant amplifier and without an axial guide magnetic field; focusing and transport of the electron beam through the wiggler interaction region are achieved by means of the bifilar helical wiggler field itself. Approximately 18 MW of rf power has been observed at a frequency of 470 GHz, corresponding to an electronic efficiency of 0.8%. Frequency spectra are measured with a grating spectrometer and show linewidths Δω/ω∼2%–4%. The experimental results are in very good agreement with nonlinear numerical simulations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.858927
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Three-dimensional simulation of the Raman free-electron laser (1988)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 31 (1988), S. 387-393 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The nonlinear evolution of the free-electron laser amplifier is investigated numerically in the collective Raman regime for a configuration in which a relativistic electron beam propagates through a loss-free cylindrical waveguide in the presence of a helical wiggler and an axial guide magnetic field. A set of coupled nonlinear differential equations is derived that governs the evolution of the TE waveguide modes, the beam space-charge mode, and the trajectories of an ensemble of electrons. Comparison with experiment shows good agreement for cases in which the intersection between the vacuum waveguide mode and the beam resonance line are near "grazing'' (i.e., when the intersections are sufficiently close together to result in one broad gain bandwidth). For interactions in which two distinct gain bands occur, the numerical procedure tends to underestimate the beam–plasma frequency and results in a 15%–20% discrepancy with experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866819
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Optimization of the efficiency in gyrotron backward-wave oscillator via a tapered axial magnetic field (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 514-516 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The efficiency of a gyrotron backward-wave oscillator (gyro-BWO) in the presence of a tapered axial guide magnetic field is calculated from a three-dimensional self-consistent theory. The saturation efficiency has a low value in the range 10–15% when the external magnetic field is uniform. However, the efficiency can be enhanced to over 30% by a small taper in the magnetic field. Numerical results are shown for operation in the TE11 mode of a cylindrical waveguide.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100916
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The 1300°C Isothermal Section in the Ti–In–C Ternary Phase Diagram (2005)
    Oxford, UK : Blackwell Science Inc
    Journal of the American Ceramic Society 88 (2005), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: In this paper we map out the 1300°C isothermal section in the Ti–In–C ternary system. Two ternary compounds exist: Ti2InCα and Ti3InCδ. At 1300°C TiCx is in equilibrium with all phases, Ti3InCδ is in equilibrium with all the phases except C, and Ti2InC is in equilibrium with all phases except Ti and C. The range of δ in Ti3InCδ varies from 0.95 to 0.8. A correlation was found between δ and the lattice parameters of this phase. The maximum solubilities of In and C in Ti are 14 and 4 at.%, respectively. Similarly, α in Ti2InCα varies from ≈0.85 to 1. The dissolution of ∼4±0.3 at.% In in TiCx reduces the C concentration to ≈24 at.%. In the In-rich corner, a liquid region exists.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1551-2916.2005.00240.x
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    THE EFFECT OF SUBDIAPHRAGMATIC VAGOTOMY ON THE GASTRIC MUCUS BARRIER IN RATS (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Clinical and experimental pharmacology and physiology 14 (1987), S. 0 
    Details
    ISSN: 1440-1681
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: 1. Little information exists on the quantitation of mucus barrier and its vagal control; hence, the effect of vagotomy on the two components of the mucus barrier was studied in the glandular regions of rat stomach.2. Bilateral subdiaphragmatic vagotomy was carried out by cutting both vagus nerves at the level of the lower end of the oesophagus. After 14 days, the glycoproteins in mucosal epithelial cells were identified by periodic acid Schiff's (PAS) staining technique and were assessed by calculating the ratio of the mucosal height to that of the thickness of PAS-positive materials in it. The adherent mucus was estimated by the Alcian blue binding technique and the results were compared with control animals subjected to mock vagotomy.3. The bilateral subdiaphragmatic vagotomy caused a significant reduction in mucosal epithelial PAS-stainable materials content in oxyntic and pyloric gland areas.4. The operation also caused a decrease in Alcian blue binding capacity of both the glandular regions.5. The data suggest that the absence of vagal influence causes weakening of both the lines of mucus barrier. The findings support the hypothesis that the vagal system must be intact in the rat in order to maintain gastric mucus glycoproteins and thereby mucosal integrity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1440-1681.1987.tb01899.x
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    GASTRIC MUCOSAL DEFENCE MECHANISM DURING STRESS OF PYLORIC OBSTRUCTION IN ALBINO RATS (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Clinical and experimental pharmacology and physiology 14 (1987), S. 0 
    Details
    ISSN: 1440-1681
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: 1. The integrity of the gastric mucosa and its ability to secrete mucus are believed to be essential for protection of gastric mucosa against ulceration induced by aggressive factors active in any stress situation. This study involves a three-compartmental analysis of gastric mucosal barrier in pylorus-ligated albino rats.2. Quantitative analyses of histologically identifiable gastric mucosal epithelial neutral glycoproteins and gastric adherent mucus from oxyntic and pyloric gland areas, and components of non-dialysable mucosubstances in gastric secretion were made under stress of pyloric obstruction for 4, 8, and 16 h durations. Epithelial mucin was identified by periodic acid-Schiff (PAS) staining technique and assessed from the ratio of gastric mucosal thickness to the depth of PAS positive materials in it. The remaining visible mucus adhered to the gastric mucosa was estimated by Alcian blue binding technique. The results were compared with that of identical control groups.3. A significant reduction in mucosal epithelial PAS positive materials after 8 or 16 h of pylorus ligation was observed.4. The Alcian blue binding capacity of the pyloric gland area was increased significantly after 4 h of pylorus ligation, while after 8 or 16 h it was reduced in both oxyntic and pyloric gland areas.5. Significant reductions in the rate of gastric secretion and volume, as well as concentration of the components of non-dialysable mucosubstances, were observed, indicating decreased synthesis of mucus glycoproteins.6. Disruption of the mucosal barrier may have occurred due to decreased mucus synthesis and acid-pepsin accumulation; both could be due to stress associated with gastric distension.7. The present findings confirm the role of mucus in protecting the underlying gastric epithelium during stress. The adherent mucus offers a first line of defence and epithelial mucus a second line of defence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1440-1681.1987.tb00976.x
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Synthesis and Antifungal Properties of 14-Aminomethyl-Substituted Lanosterol Derivatives (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 544 (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.tb40394.x
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    Paper (German National Licenses)
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