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  • 1
    Electronic Resource
    Electronic Resource
    Fracture in concrete specimens of differing scale (1998)
    Bradford : Emerald
    Engineering computations 15 (1998), S. 1094-1116 
    Details
    ISSN: 0264-4401
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Technology
    Notes: A planar lattice network of beam elements is used to study the mechanisms of fracture in cement-based materials. Beam properties are controlled by a nonlinear elastic fracture law which roughly accounts for three-dimensionality of the material and fracture process. Special attention is given to modeling toughening mechanisms associated with aggregate-matrix interface failure. The distributions of damage and fracture energy consumption are resolved at the material mesoscale and are shown to depend on strain gradient. An adaptive remeshing procedure is used to reduce computational cost and enable analyses of specimens of significantly differing scale, while keeping the lattice density constant. Larger process zones, higher specific fracture energies, and lower specific peak loads are obtained with increasing specimen size, in agreement with published test results. These computations provide information useful in developing refined macromodels for engineering analyses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/02644409810244156
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  • 2
    Electronic Resource
    Electronic Resource
    Spectral resolution of more than one chlorophyll electron donor in the isolated Photosystem II reaction centre complex
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Bioenergetics 1017 (1990), S. 143-151 
    Details
    ISSN: 0005-2728
    Keywords: P680 ; Photosynthesis ; Photosystem II ; Primary donor ; Reaction center
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0005-2728(90)90145-T
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  • 3
    Electronic Resource
    Electronic Resource
    Characteristics of the chandler wobble
    Amsterdam : Elsevier
    Chinese Astronomy 4 (1980), S. 127-135 
    Details
    ISSN: 0146-6364
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0146-6364(80)90043-2
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  • 4
    Electronic Resource
    Electronic Resource
    Pseudospark-based electron beam and Cherenkov maser experiments (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 5195-5205 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Detailed experimental results from the first free-electron maser experiment to use a pseudospark-based electron beam are presented in this paper. These include the design and realization of a pseudospark-based electron beam source and Cherenkov maser experiment. A pulsed, 70–80 kV, 10 A electron beam was obtained from the hollow cathode discharge phase of an 8-gap pseudospark (PS) discharge. The beam was used to produce coherent microwave radiation via a Cherenkov interaction between the electron beam and the TM01 mode of a 60-cm long alumina-lined waveguide. A gain of 29±3 dB was measured and an output power of 2±0.2 kW in the frequency range 25.5–28.6 GHz. Results from numerical simulations of the Cherenkov amplification are also presented and found to be consistent with the experimental results. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1319637
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  • 5
    Electronic Resource
    Electronic Resource
    UHV compatible compact double-crystal monochromator at BEPC diffraction and scattering beamline 4B9A : International conference on synchrotron radiation instrumentation (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 2054-2057 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A UHV compatible compact double-crystal monochromator was designed and constructed for BEPC diffraction and the scattering beamline 4B9A. It is a compact device with a 325 ×250×250 mm3 vacuum chamber. A T-structure mechanism has been designed for allowing the monochromator to have a Bragg angle range from 5° to 70° and keep the exit beam position and direction fixed during wavelength tuning. The first crystal is cooled by a heat-pipe cooling system and a pair of PZT drivers provide a two-dimensional adjustment to optimize the alignment between two crystals. The design and operating principles are described in this paper.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140875
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  • 6
    Electronic Resource
    Electronic Resource
    VUV-SX spherical grating monochromator for BEPC beamline 4B9B : International conference on synchrotron radiation instrumentation (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 2085-2088 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The BEPC beamline 4B9B is intended for VUV-SX photoelectron spectroscopy and other soft x-ray applications. The beamline optical system consists of a focusing mirror system and a VUV-SX spherical grating monochromator with four gratings, which cover a large spectral range 10–1100 eV. Three laminar gratings (1100, 500, and 200 lines/mm) with a 57–m radius are used at a 174° including angle, and the other grating (600 lines/mm) with a 6-m radius is used at a 142° including angle to be suited for low-energy use. Scanning is achieved by the rotation of the grating, and a pair of stepping motor-driven slits follow the Rowland circle to improve the monochromator's performance. The optical design and ray tracing results about this monochromator are described
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140832
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  • 7
    Electronic Resource
    Electronic Resource
    Simultaneous axial and rotational electron beam velocity measurement using a phosphor scintillator (2001)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 72 (2001), S. 2268-2270 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A novel method which measures beam axial and rotational velocity for any large-orbit beam with a common guiding center is described. Time-integrated beam velocity information is obtained using a beam block and phosphor scintillator. Results using this method are compared to capacitive probe measurements and trajectory modeling for the electron beam for a cyclotron autoresonance maser oscillator. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1366633
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  • 8
    Electronic Resource
    Electronic Resource
    Study of a fast, high-impedance, high-voltage pulse divider (2001)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 72 (2001), S. 4266-4269 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A novel two-tube, two-stage, self-compensating resistive voltage divider with minimized stray capacitance using copper sulphate solution was explored to measure a fast high-impulse voltage output from a cable Blumlein generator. Self-compensation of the probe was achieved by matching the RC time constant in the two dividing stages. Stray capacitance of the probe was minimized by electric field contouring and matching methods. Experiments were carried out to investigate the probe responses as affected by self-capacitance, impedance, and stray capacitance. Calibration of the optimized probe showed a rise time of 15 ns at a load impedance of 8.68 kΩ with a hold-off voltage of 600 kV. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1408937
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  • 9
    Electronic Resource
    Electronic Resource
    Propagation and post-acceleration of a pseudospark-sourced electron beam (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 91 (2002), S. 5419-5422 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Propagation and post-acceleration of a pseudospark-sourced electron beam from a three-gap pseudospark discharge chamber were studied in recent experiments. The pseudospark produced an electron beam of two phases, an initial 22 kV, 50 A hollow cathode phase beam of brightness 109−10 Am−2 rad−2 followed by a 200 V, 200 A conductive phase (CP) beam of brightness 1011−12 Am−2 rad−2. The aim of these experiments was to post accelerate the lower-voltage, higher-current CP beam using an acceleration unit driven by a 40 kV, 125 ns voltage pulse produced by a cable Blumlein. The experiments were realized by attaching an acceleration unit to the downstream side of the anode of the discharge chamber. Both the pseudospark discharge and the cable Blumlein were triggered to ensure time correlation between initiation of the pseudospark discharge and post-acceleration of the beam. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1459757
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  • 10
    Electronic Resource
    Electronic Resource
    Single-gap pseudospark discharge experiments (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 90 (2001), S. 3212-3218 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An experimental investigation of a single-gap pseudospark was conducted using a flexible discharge chamber. The voltage breakdown characteristics were studied against a wide range of parameters such as gas pressure, gap separation, cathode cavity depth, cathode aperture size, external capacitance and applied voltage. An empirical formula, VB=(0.20±0.05) p−4.02±0.18 d−1.77±0.01, was obtained for the breakdown voltage VB in kV, given the gas pressure p in Torr and the gap separation d in mm. The electron beam extracted from this single gap was also studied and a current of up to 100 A was measured at 10 kV. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1398065
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