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  • Articles  (75)
  • 1995-1999  (35)
  • 1990-1994  (40)
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  • 1
    Electronic Resource
    Electronic Resource
    Solar blind chemically vapor deposited diamond detectors for vacuum ultraviolet pulsed light-source characterization (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 84 (1998), S. 5331-5336 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A major difficulty in characterizing vacuum ultraviolet (VUV) radiation produced by harmonic generation or four-wave sum frequency mixing arises in differentiating between the desired VUV signal and the remaining fundamental pump laser beam. To overcome this problem, visible and near UV blind VUV detectors, made from natural and synthetic diamond, have been developed. Such detectors have been used to characterize coherent VUV pulses (λ=125 nm, pulse duration at full width half maximum (FWHM) τFWHM∼7 ns) generated by resonance-enhanced four-wave sum mixing in mercury vapor. They allow full characterization of the intensity profile of the VUV pulses, without any significant parasitic signal from simultaneous stray light irradiation at λ=313 nm. Detectors were fabricated exhibiting response times of less than 70 ps at FWHM, corresponding to the lowest response time obtainable with a 7 GHz bandwidth single-shot oscilloscope. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.368782
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  • 2
    Electronic Resource
    Electronic Resource
    Reducing Microbial Populations on Beef Tissues: Concentration and Temperature of an Acid Mixture (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 55 (1990), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A mixture of 2% acetic, 1% lactic, 0.25% citric and 0.1% ascorbic acid was applied to beef core samples of muscle inoculated with bacteria. Experimental variables were concentration and temperature of mixed acids and type of microorganism. Overall, an increase in either mixed acids concentration (0 to 3%) or temperature (20 to 70°C) resulted in reductions in counts of about one logi0 for aerobic bacteria and S. ryphimurium, less than one log10 for Enterobacteriaceae, and about one-half log10 for E. coli. Initial meat surface pH dropped to 4.3 after treatment with 3% mixed acids solution but rose to 5.2 after 24 hr. Overall, this mixture of acids performed about the same as acetic acid or lactic acid under the same conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1990.tb01561.x
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  • 3
    Electronic Resource
    Electronic Resource
    Frozen Dessert Attribute Changes with Increased Amounts of Unsaturated Fatty Acids (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 59 (1994), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Vanilla flavor frozen desserts were made to be similar in composition except for the fat. Canola and soybean oils were combined with milk fat to provide fatty acid ratios of 1:1:1 and 3:2:1 (saturated: monounsaturated:polyunsaturated), whereas the milk fat control had a ratio of 24:8.6: 1. Sensory, physical and chemical tests indicated minimal differences between the control ice cream and the dessert with the 3:2:1 ratio. However, product with the 1:1:1 ratio was described as oily and oxidized in flavor. It melted faster, was softer in the penetration test and coarser in texture than the ice cream control.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1994.tb14682.x
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  • 4
    Electronic Resource
    Electronic Resource
    Microentrapment of Lactobacilli in Calcium Alginate Gels (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 58 (1993), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A procedure was developed to entrap culture bacteria using a two-phase (water/oil) system. It consisted of 3% sodium alginate mixed with microbial cells and suspended in an oil bath containing 0.2% Tween 80. While stirring at 200 rpm, calcium chloride (O.OSM) solution was added to break the water/oil emulsion and form calcium alginate gel. The calcium alginate beads containing microbial cells had mean diameters of 25–35 μm (range S-100 μm). The entrapped microbial cells were released completely from the drop shaped beads by gentle shaking in 0.lM phosphate solution (pH 7.5) for 10 min. About 40% more lactobacilli survived freezing of ice milk when they were entrapped in calcium alginate than when they were not entrapped.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1993.tb04323.x
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  • 5
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    Unknown
    HAHN MOO-SOOK, "Encounter: A Novel of Nineteenth-Century Korea" (Book Review) (1995)
    Ann Arbor, Mich., etc., : Periodicals Archive Online (PAO)
    Journal of Asian Studies. 54:2 (1995:May) 577 
    Details
    ISSN: 0021-9118
    Topics: Political Science , Economics
    Description / Table of Contents: Korea
    Notes: Book Reviews
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:1113-1995-054-02-000072
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  • 6
    Electronic Resource
    Electronic Resource
    Human gene for physical performance (1998)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 393 (1998), S. 221-222 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A specific genetic factor that strongly influences human physical performance has not so far been reported, but here we show that a polymorphism in the gene encoding angiotensin-converting enzyme does just that. An ‘insertion’ allele of the gene is associated with elite endurance ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/30374
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  • 7
    Electronic Resource
    Electronic Resource
    Diamond-based semi-transparent beam-position monitor for synchrotron radiation applications (1999)
    Chester : International Union of Crystallography (IUCr)
    Journal of synchrotron radiation 6 (1999), S. 1-5 
    Details
    ISSN: 1600-5775
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A soft X-ray beam-position monitor based on a thin CVD diamond photodetector has been developed for use on third-generation synchrotron radiation facilities, and has been tested on beamlines ID26 and ID12 at the European Synchrotron Radiation Facility. Since diamond exhibits a low absorption to low-energy X-ray photons, this device allows beam-position monitoring with very little beam attenuation at photon energies as low as 2 keV. The devices presented here find their use essentially on low-energy monochromatic beamlines with narrow beam sizes (typically below 1 mm2). Measurements performed on a 20 µm-thick device show that a position sensitivity of 2 µm can readily be achieved with a photon flux attenuation of 22% at 4 keV. This allows permanent in-situ monitoring of beam instabilities during experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S090904959801509X
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  • 8
    Electronic Resource
    Electronic Resource
    Observations of Pc 3–4 and Pi 2 geomagnetic pulsations in the low-latitude ionosphere (1999)
    Springer
    Annales geophysicae 17 (1999), S. 1397-1410 
    Details
    ISSN: 0992-7689
    Keywords: Ionosphere (ionosphere irregularities) ; Magnetospheric physics (magnetosphere-ionosphere interactions) ; Radio science (ionospheric physics)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Day-time Pc 3–4 (≃5–60 mHz) and night-time Pi 2 (≃5–20 mHz) ULF waves propagating down through the ionosphere can cause oscillations in the Doppler shift of HF radio transmissions that are correlated with the magnetic pulsations recorded on the ground. In order to examine properties of these correlated signals, we conducted a joint HF Doppler/magnetometer experiment for two six-month intervals at a location near L = 1.8. The magnetic pulsations were best correlated with ionospheric oscillations from near the F region peak. The Doppler oscillations were in phase at two different altitudes, and their amplitude increased in proportion to the radio sounding frequency. The same results were obtained for the O- and X-mode radio signals. A surprising finding was a constant phase difference between the pulsations in the ionosphere and on the ground for all frequencies below the local field line resonance frequency, independent of season or local time. These observations have been compared with theoretical predictions of the amplitude and phase of ionospheric Doppler oscillations driven by downgoing Alfvén mode waves. Our results agree with these predictions at or very near the field line resonance frequency but not at other frequencies. We conclude that the majority of the observations, which are for pulsations below the resonant frequency, are associated with downgoing fast mode waves, and models of the wave-ionosphere interaction need to be modified accordingly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-999-1397-2
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  • 9
    Electronic Resource
    Electronic Resource
    An approximation method for eigenvectors of very large matrices (1991)
    Springer
    Journal of scientific computing 6 (1991), S. 251-267 
    Details
    ISSN: 1573-7691
    Keywords: Eigenvalue ; eigenvector ; Monte-Carlo methods ; Hamiltonian matrix
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract A Monte-Carlo approach for solving huge, dense matrices for eigenvalues and eigenvectors is proposed. The matrix must satisfy certain conditions including a smooth density of diagonal elements curve and relatively constant off-diagonal elements. The approach simply involves randomly choosing a finite order (as large as computationally possible) subset matrix from the original matrix and then diagonalizing the subset. The results are crude, but often informative.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01062812
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  • 10
    Electronic Resource
    Electronic Resource
    Fission fragment distribution following antiproton absorption at rest on238U (1992)
    Springer
    The European physical journal 343 (1992), S. 73-77 
    Details
    ISSN: 1434-601X
    Keywords: 25.85 ; 13.75.C
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The distribution of nuclei resulting from the annihilation of stopped antiprotons on238U has been studied by an off-line measurement of the residual radioactivity. It was found that the probability of fission exceeds 84% (68% c.l.). The charge and mass distributions of the fission products can be separated into two parts, a more frequent symmetric component originating from high energy fission (excitation energy between 100 MeV and 1 GeV) and an asymmetric component from low energy fission (excitation energy less than 40 MeV).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01291600
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