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  • 2000-2004  (8)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    A theoretical model for the generation of co-current rotation by radio frequency heating observed on Alcator C-Mod (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 1089-1093 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A theoretical model is presented which shows generation of a co-current directional central toroidal rotation by a nondirectional on-axis ion cyclotron heating in the Low-mode plasmas of Alcator C-Mod tokamak [I. H. Hutchinson et al., Phys. Plasmas 1, 1511 (1994)]. It is shown that a net-inward nonambipolar transport of resonant ions can induce such a rotation. The net-inward transport is a result of the passing ion dominant transport process in Alcator C-Mod. The opposite horizontal orbit shift between co- and counter-passing ions makes the wave absorption asymmetric in k(parallel). © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873948
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Strong variation of average ion energy in oscillation frequency of sheath potential (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 766-769 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In a modern plasma etching device, the plasma sheath potential is usually superposed by an externally driven oscillating voltage to enhance and control the bombarding ion energy. A collisionless particle simulation is used to study the variation of average kinetic energy 〈K〉(νrf) of bombarding ions as a function of a wide range of sheath oscillation frequency νrf (0.1νpi≤νrf≤10νpi, where νpi is the ion plasma frequency). It is found that a resonance phenomenon between the ion transit motion and the sheath oscillation can yield a strongly peaked enhancement of 〈K〉(νrf) near νrf(similar, equals)0.5νpi. Ion species with different mass show the peaks at different νrf. The relative importance of different ion molecules in an ion-enhanced etching process will be sensitive to νrf. This phenomenon may allow a reduction of the undesirable capacitive coupling by optimizing νrf to yield an enhanced 〈K〉 of desired ion species at low applied voltages. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873870
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of poloidal electric field on electron cyclotron current drive in a tokamak geometry (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 4948-4959 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Effect of a poloidal electric field on the electron cyclotron current drive is studied in a tokamak geometry. A general discussion of its influence on the electron phase-space dynamics and current drive efficiency is presented. It is shown that the modification to the current drive efficiency increases as the heating location is moved out in the major radius. It is concluded that the modification is only moderate to insignificant (〈10% for low magnetic field side heating and 〈3% for high field side heating) for a poloidal electrostatic potential variation of order inverse aspect ratio under an efficient current drive. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1317522
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Response to "Comment on ‘Generation of plasma rotation by ion cyclotron resonance heating in tokamaks' " [Phys. Plasmas 7, 4782 (2000)] (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 4784-4784 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1312818
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  • 5
    Electronic Resource
    Electronic Resource
    Antenna configuration for uniform large-area inductively coupled plasma production (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 492-494 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An antenna configuration for uniform plasma generation in a large-area inductively coupled plasma (ICP) source is presented and investigated using numerical analysis. The numerical results show that a properly tuned, segmented coil system with an external variable capacitor can allow antenna voltage, currents, and plasma uniformity to be controlled in the large-area ICP source. The key element of this concept is to induce LC-resonance in the coil system by the external capacitance variation. Through the LC-resonance, not only a small antenna voltage can be obtained, but also a selected coil current near a low plasma density regime can be significantly enhanced. Self-consistent fluid simulations for Ar and Cl2 plasmas indicate that the radial plasma spread can be optimized near the LC-resonance condition. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.127021
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  • 6
    Electronic Resource
    Electronic Resource
    Evolution of the electron energy distribution function in a planar inductive argon discharge (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 76 (2000), S. 149-151 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The evolution of the electron energy distribution function (EEDF) over a pressure range of 5–100 mTorr is investigated in a planar inductive argon discharge. It is found that the EEDF, which appears to be a bi-Maxwellian distribution with a two-temperature structure at low pressures, evolves into a Druyvesteyn-like distribution as the pressure increases. The electron energy diffusion coefficient, which describes electron heating, is calculated under the same discharge conditions using discharge parameters and numerical results show that the heating of low-energy electrons is enhanced as the pressure increases resulting in a transition of the EEDF to a Druyvesteyn distribution. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.125685
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  • 7
    Electronic Resource
    Electronic Resource
    Primary resistance to antibiotics and its clinical impact on the efficacy of Helicobacter pylori lansoprazole-based triple therapies (2002)
    Oxford UK : Blackwell Science Ltd
    Alimentary pharmacology & therapeutics 16 (2002), S. 0 
    Details
    ISSN: 1365-2036
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: To evaluate Helicobacter pylori primary resistance and its clinical impact on the efficacy of two lansoprazole-based eradication triple therapies.〈section xml:id="abs1-2"〉〈title type="main"〉Methods: H. pylori-positive patients (n=228) were randomized to receive one of the 1-week regimens: lansoprazole 30 mg, clarithromycin 500 mg and amoxicillin 1 g (LAC), or lansoprazole 30 mg, clarithromycin 500 mg and metronidazole 500 mg (LMC), each given twice daily. H. pylori status was assessed by 13C-urea breath test and culture at diagnosis and by 13C-urea breath test 6 weeks after therapy. Antibiotic susceptibility was determined by E-test (n=98).〈section xml:id="abs1-3"〉〈title type="main"〉Results:The eradication rates with per protocol/ intention-to-treat analyses were: LAC (n=95/114) 83%/69% and LMC (n=96/114) 85%/72%. Primary resistance was 11% for clarithromycin, 41% for metronidazole and 0% for amoxicillin. Eradication in metronidazole-susceptible/-resistant strains was 85%/82% in LAC and 83%/63% in LMC. Significantly lower cure rates were observed in clarithromycin-resistant patients treated with LAC (95% vs. 0%, P 〈 0.001) and LMC (86% vs. 0%, P 〈 0.001).〈section xml:id="abs1-4"〉〈title type="main"〉Conclusions:One-week LAC and LMC are similarly effective therapies. Clarithromycin resistance significantly affected H. pylori eradication in both regimens.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2036.2002.01184.x
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  • 8
    Electronic Resource
    Electronic Resource
    Application of higher-order tensor theory for formulating enhanced continuum models (2000)
    Springer
    Acta mechanica 142 (2000), S. 223-234 
    Details
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary In this paper attention is focussed on the derivation of higher-order isotropic tensors and their application in the formulation of enhanced continuum models. A mathematical theory will be discussed which relates formal orthogonal invariant polynomial functions to isotropic tensors. Using this theory, the second-order to the sixth-order isotropic tensor will be derived. When the tensor order increases, the derivation procedure clearly reveals a repeatable character. Thereafter, an example will be given of how the higher-order isotropic tensors can be used in the formulation of an enhanced continuum model. It will be demonstrated that symmetry conditions significantly reduce the number of material parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01190020
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