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  • 1
    Electronic Resource
    Electronic Resource
    Rhizomatous Birdsfoot Trefoil Exhibits a Unique Response to Nitrogen-Free Conditions (1998)
    Springer
    Semigroup forum 90 (1998), S. 709-713 
    Details
    ISSN: 1432-2137
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Lotus corniculatus L.) from Morocco exhibit rhizomes, but little is known about their N2-fixation characteristics. Our objective was to evaluate the N2-fixations capacity of rhizomatous birdsfoot trefoil infected by native rhizobia or by strains used in commercial inoculants. An additional objective was to assess the N2-fixing potential of two Moroccan isolates, R.L. 5797 and R.L. 5758, on commercial cultivars of birdsfoot trefoil. Seedlings of 'Norcen', 'AU Dewey', and a Moroccan rhizomatous entry, designated 'RBRC', were individually inoculated with commercial strains BFT027, BFT028, BFT030, 1710-2, CB756, or strains R.L. 5797 or R.L. 5758. Control treatments were noninoculated seedlings with or without supplemental N. Surprisingly, the seedling mass of RBRC was equal (P 〉 0.05) for all treatments. Norcen exhibited its greatest seedling mass when inoculated with strain BFT027; AU Dewey, with strain R.L. 5797. The rhizomatous RBRC did not show specificity for native Moroccan isolates of rhizobia, but these isolates effectively nodulated the commercial cultivars of birdsfoot trefoil.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/
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  • 2
    Book
    Book
    Advection-diffusion; Vol. 1 (1998)
    Chichester u.a. :Wiley,
    Details
    Title: Advection-diffusion; Vol. 1
    Author: Gresho, Phillipe M.
    Contributer: Sani, Robert L.
    Publisher: Chichester u.a. :Wiley,
    Year of publication: 1998
    Pages: 445 S.
    Series Statement: Incompressible flow and the finite element method Vol. 1
    Type of Medium: Book
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    ZIB Catalog
    Zuse Institute Berlin get availability status
  • 3
    Book
    Book
    Isothermal laminar flow; Vol. 2 (1998)
    Chichester u.a. :Wiley,
    Details
    Title: Isothermal laminar flow; Vol. 2
    Author: Gresho, Phillipe M.
    Contributer: Sani, Robert L.
    Publisher: Chichester u.a. :Wiley,
    Year of publication: 1998
    Pages: S. 447-1020
    Series Statement: Incompressible flow and the finite element method Vol. 2
    Type of Medium: Book
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    ZIB Catalog
    Zuse Institute Berlin get availability status
  • 4
    Electronic Resource
    Electronic Resource
    Trajectory and entrainment of a round jet in crossflow (1998)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 10 (1998), S. 2323-2335 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This paper examines the trajectory and entrainment characteristics of a round jet in crossflow. A series of large eddy simulations was performed at Reynolds numbers of 1050 and 2100 and at jet to crossflow velocity ratios of 2.0 and 3.3. Trajectories, which are defined based on the mean streamlines on the centerplane, all collapse to a single curve far from the jet exit, and this curve can be represented with a power law fit. Within this power law region, entrainment of crossflow fluid is shown to be the primary mechanism by which the jet trajectory is determined. Upstream of the power law region, near the jet exit, jet trajectory varies from changes in pressure drag and from differences in the turbulence intensities in the incoming pipe flow. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.869751
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  • 5
    Electronic Resource
    Electronic Resource
    Improved gas-filled hohlraum performance on Nova with beam smoothing : The 39th annual meeting of division of plasma physics of APS (1998)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 5 (1998), S. 1927-1934 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Gas-filled hohlraums are presently the base line ignition target design for the National Ignition Facility. Initial Nova [E. M. Campbell et al. Rev. Sci. Instrum. 57, 2101 (1986).] experiments on gas-filled hohlraums showed that radiation temperature was reduced due to stimulated Brillouin and stimulated Raman scattering losses and that implosion symmetry had shifted compared with vacuum hohlraums and calculations. Subsequent single beam experiments imaging thermal x-ray emission showed the shift is due to laser–plasma heating dynamics and filamentation in a flowing plasma. Experiments using a single beam have shown that scattering losses and effects of filamentation are reduced when the beam is spatially smoothed with a random phase plate or kinoform phase plate. Scattering is further reduced to less than 5% of the incident laser energy when temporal smoothing is added.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872822
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  • 6
    Electronic Resource
    Electronic Resource
    Investigation of quantum efficiencies in multilayered photocathodes for microchannel plate applications : Proceedings of the 12th topical conference on high temperature plasma diagnostics (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 659-662 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Microchannel plates (MCPs) are used in many diagnostic systems to study laser-plasma interactions. Typically the front surface of a MCP is coated with some photocathode (PC) material to convert x ray to electron. This is followed by electron multiplication along the microchannels. Materials such as CsI, Al, and Au have been identified as good PC materials, but the overall quantum efficiencies of these materials are low, so that electron multiplication along the channel has been the only path to signal amplification. This approach is known to have some problems (J. D. Wiedwald, University of California UCRL-JC-110906, August 1992). We investigated the effect of pairing transmission PC to standard MC's and found that CsI and Au foils used in multilayered configuration, significantly enhance the overall quantum efficiency of the combination. The findings could lead to better MCP design and fabrication.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149343
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  • 7
    Electronic Resource
    Electronic Resource
    A reactive laser ablation source for the production of thin films (1998)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 3028-3030 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A discription of a thin film deposition source which is based upon the "Smalley metal cluster source" is presented. Our laser assisted molecular beam deposition source incorporates four major innovations: (1) placing the source so it sits external to the deposition chamber, (2) positioning the ablation target at an angle greater than 90° with respect to the laser entrance window, (3) placing the laser entrance window/lens further from the ablation target, and (4) the addition of a second optical window for laser alignment and in situ spectral analysis of the laser ablation plume. Novel molecules can be generated in this source through use of a reactive carrier gas. For example, employing a Ti target rod and O2 carrier gas; flat, uniform micron thick thin films of TiO2 can be easily generated. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149064
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  • 8
    Electronic Resource
    Electronic Resource
    Determination of inductive shielding factors in double-layer structures (1997)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 246-249 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Our experiments show that multilayer inductive shielding performs better than a monolayer shielding of equivalent thickness. We developed an analytic expression for the shielding factor S of a two-layer inductive shielding, extendible to an arbitrary number of layers. The experimental data, obtained from a reduced scale model, fitted this expression well. We demonstrated that multilayer inductive shielding offers better performance for a better price than a traditional monolayer shielding. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147818
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  • 9
    Electronic Resource
    Electronic Resource
    Pixel array detector for time-resolved x-ray scattering : The 9th National conference on synchrotron radiation instrumentation (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 3360-3360 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: This paper describes the development of a large area hybrid pixel detector designed for time-resolved synchrotron x-ray scattering experiments in which limited frames, with a high framing rate, are required. The final design parameters call for a 1024×1024 pixel array device with 150-micron pixels that is 100% quantum efficient for x-rays with energy up to 20 keV, with a framing rate in the microsecond range. The device will consist of a fully depleted diode array bump bonded to a CMOS electronic storage capacitor array with eight frames per pixel. The two devices may be separated by a x-ray blocking layer that protects the radiation-sensitive electronics layer from damage. The signal is integrated in the electronics layer and stored in one of eight CMOS capacitors. After eight frames are taken, the data are then read out, using clocking electronics external to the detector, and stored in a RAM disk. Results will be presented on the development of a prototype 4×4 pixel electronics layer that is capable of storing at least 10,000 12-keV x-ray photons for a capacity of over 50 million electrons with a noise corresponding to 2 x-ray photons per pixel. The diode detective layer and electronics storage layer along with the radiation damage and blocking layers will be discussed. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147389
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  • 10
    Electronic Resource
    Electronic Resource
    Drive characterization of indirect drive targets on the Nova laser (invited) : Proceedings of the tenth topical conference on high temperature plasma diagnostics (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 678-682 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The indirect drive method of inertial confinement fusion uses a high-Z radiation case to convert energy from high-powered laser beams to x rays which implode fusion capsules. Experiments have been performed on the Nova laser to characterize the x-ray production in high-Z cavities for studying the efficiency for x-ray production using two methods for characterization. One method measures the shock velocity produced in low-Z materials by the radiation. The shock velocity is measured by observing the optical signal from the rear of a stepped or continuously varying thickness of Al placed over a hole in the cavity wall. The other method measures the reradiated x-ray flux from the cavity wall viewing through a hole in the cavity. Both methods have been shown to provide a consistent characterization of the x-ray drive in the cavity target. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146258
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