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  • 11
    Electronic Resource
    Electronic Resource
    Resolving the propagation direction of tokamak microturbulence via homodyne spectroscopy (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 1977-1979 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new homodyne spectroscopy technique [T. Tsukishima and O. Asada, Jpn. J. Appl. Phys. 17, 2059 (1978)] has been applied to tokamak microturbulence measurements in order to resolve the frequency spectra and wave propagation direction of low-frequency density fluctuations. Application of this method provides a high-resolution, inexpensive, and easily implemented alternative to the more technically demanding heterodyne detection schemes typically available. Comparison of heterodyne and the new homodyne spectroscopy results will be made.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138811
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  • 12
    Electronic Resource
    Electronic Resource
    RADIATION EFFECTS IN PARAMECIUM (1955)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 59 (1955), 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.1749-6632.1955.tb45974.x
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  • 13
    Electronic Resource
    Electronic Resource
    Experimental measurement of three-wave coupling and energy cascading (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 153-163 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The nonlinear coupling coefficient and the energy transfer associated with three-wave interactions are computed from measured data of the turbulent edge plasma of the Texas Experimental Tokamak(TEXT) [Nucl. Technol. Fusion 1, 479 (1981)]. The results show the presence of three-wave interactions. The interactions cause energy to cascade away from the dominant waves of the spectrum primarily toward lower, but also toward higher frequencies. The results are obtained with a new digital spectral analysis technique based on the estimation of higher-order cumulants. The method is discussed and tested on a simulation experiment. The same technique is useful for neutral fluids as well.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859082
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  • 14
    Electronic Resource
    Electronic Resource
    Cellular Radiobiology (1957)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Nuclear and Particle Science 7 (1957), S. 63-88 
    Details
    ISSN: 0066-4243
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.ns.07.120157.000431
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  • 15
    Electronic Resource
    Electronic Resource
    Nonlinear spectral dynamics of a transitioning flow (1988)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 31 (1988), S. 3577-3588 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The nonlinear spectral dynamics of a transitioning flow in the wake of a flat plate is experimentally studied at different downstream positions with a two-point method. The measurement setup consists of two sensors, which are separated in the downstream direction. The quadratically nonlinear transfer function between the two points is then estimated from the digitized fluctuation data. Such transfer functions permit one to quantify the quadratically nonlinear spectral dynamics occurring between the two sensor points. The method used to estimate the transfer functions and local bicoherency for non-Gaussian input and output signals, by means of digital spectral analysis techniques, is briefly discussed. The measured quadratic transfer function of the experimental data changes gradually with downstream distance, but its main features are unchanged. The observed appearance of progressively higher harmonics of the fundamental mode and the filling in of the spectral valleys over short downstream distances are, thus, mainly caused by spectral redistribution of energy that is available in the interacting modes and not caused by abrupt changes in the coupling properties. This result is supported by the local bicoherency measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866875
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  • 16
    Electronic Resource
    Electronic Resource
    COMPARISON OF PRECOOKED IRRADIATED CHICKEN AND LAMB WITH AND WITHOUT PARTIAL DEHYDRATION (1972)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 37 (1972), 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
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1972.tb02665.x
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  • 17
    Electronic Resource
    Electronic Resource
    COMPARISONS OF THE BIOLOGICAL EFFECTS OF IONIZING RADIATIONS AND CERTAIN ALKYLATING AGENTS IN CELL SYSTEMS (1958)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 68 (1958), 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.1749-6632.1958.tb42635.x
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  • 18
    Electronic Resource
    Electronic Resource
    A study of the temperature dependence of radiation sensitivity of dry spores ofBacillus Megaterium between 5° K and 309° K (1958)
    Springer
    Cellular and molecular life sciences 14 (1958), S. 324-326 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Die Temperaturabhängigkeit der Röntgenstrahlenempfindlichkeit trockener Sporen vonBacillus megaterium wurde über einen Temperaturbereich von 5°K bis 309°K gemessen. Die Empfindlichkeit ist temperaturunabhängig unterhalb 130°K; sie entspricht der van-t'Hoff-Arrhenius-Regel zwischen 130°K und 310°K bei einer Aktivierungsenergie von 0,110 kcal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02160387
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  • 19
    Electronic Resource
    Electronic Resource
    Measurement of the local wavenumber and frequency spectrum in a plane wake (1988)
    Springer
    Experiments in fluids 6 (1988), S. 365-372 
    Details
    ISSN: 1432-1114
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A digital technique is presented for experimentally measuring the local wavenumber-frequency spectrum S L(k, f) of a fluctuating velocity field using two probes. From S L(k, f), the local wavenumber spectrum S L(k), the averaged dispersion relation, and the broadening of the wavenumber spectrum for a given frequency can be determined. The technique is demonstrated by applying it to the velocity field of a plane wake which is undergoing transition from laminar to turbulent flow. A specially designed two sensor hotwire probe is used to obtain simultaneous records of streamwise velocity fluctuations at two locations having a fixed streamwise separation. New information is obtained concerning: the spatial characteristics of instability waves in the wake; the importance of local wavenumber matching in nonlinear coupling among waves; and broadening of the dispersion relation associated with the transition to turbulence. The usefulness of the S L(k, f) approach when Taylor's hypothesis is not valid is also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00196481
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  • 20
    Electronic Resource
    Electronic Resource
    A technique to measure wavenumber mismatch between quadratically interacting modes (1995)
    Springer
    Experiments in fluids 18 (1995), S. 217-224 
    Details
    ISSN: 1432-1114
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Nonlinear energy cascade by means of three-wave resonant interactions is a characteristic feature of transitioning and turbulent flows. Resonant wavenumber mismatch between these interacting modes can arise from the dispersive characteristics of the interacting waves and from spectral broadening due to random effects. In this paper, a general technique is presented to estimate the average level of instantaneous wavenumber mismatch, 〈Δk〉=〈k m -k i -k j 〉, between components whose frequencies obey the resonant selection condition, f m -f i-f j =o. Cross-correlation of the auto-bispectrum is used to quantify the level of mismatch. The concept of bispectrum coupling coherency is introduced to determine the confidence level in the wavenumber mismatch estimates. These techniques are then applied to measure wavenumber mismatch in the transitioning field of a plane wake. The results show that the average of the instantaneous mismatch between the actual interacting modes 〈k m -k i -k j 〉 is in general not equal to the mismatch between the average wavenumbers of each interacting mode 〈k m 〉-〈k i 〉-〈k j 〉.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00195090
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