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  • 1
    Electronic Resource
    Electronic Resource
    Spectral estimation of plasma fluctuations. II. Nonstationary analysis of edge localized mode spectra (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 1 (1994), S. 501-514 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Several analysis methods for nonstationary fluctuations are described and applied to the edge localized mode (ELM) instabilities of limiter H-mode plasmas. The microwave scattering diagnostic observes poloidal kθ values of 3.3 cm−1, averaged over a 20 cm region at the plasma edge. A short autoregressive filter enhances the nonstationary component of the plasma fluctuations by removing much of the background level of stationary fluctuations. Between ELM's, the spectrum predominantly consists of broadband 300–700 kHz fluctuations propagating in the electron diamagnetic drift direction, indicating the presence of a negative electric field near the plasma edge. The time-frequency spectrogram is computed with the multiple taper technique. By using the singular value decomposition of the spectrogram, it is shown that the spectrum during the ELM is broader and more symmetric than that of the stationary spectrum. The ELM period and the evolution of the spectrum between ELM's varies from discharge to discharge. For the discharge under consideration which has distinct ELM's with a 1 ms period, the spectrum has a maximum in the electron drift direction which relaxes to a near constant value in the first half millisecond after the end of the ELM and then grows slowly. In contrast, the level of the fluctuations in the ion drift direction increases exponentially by a factor of 8 in the 5 ms after the ELM. High frequency precursors are found which occur 1 ms before the ELM's and propagate in the ion drift direction. These precursors are very short (∼10 μs), coherent bursts, and they predict the occurrence of an ELM with a high success rate. A second detector, measuring fluctuations 20 cm from the plasma edge with kθ values of 8.5 cm−1, shows no precursor activity. The spectra in the ion drift direction are very similar on both detectors, while the "electron'' spectrum level is significantly larger on this second detector.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.870939
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  • 2
    Electronic Resource
    Electronic Resource
    Spectral estimation of plasma fluctuations. I. Comparison of methods (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 1 (1994), S. 485-500 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The relative root mean squared errors (RMSE) of nonparametric methods for spectral estimation is compared for microwave scattering data of plasma fluctuations. These methods reduce the variance of the periodogram estimate by averaging the spectrum over a frequency bandwidth. As the bandwidth increases, the variance decreases, but the bias error increases. The plasma spectra vary by over four orders of magnitude, and therefore, using a spectral window is necessary. The smoothed tapered periodogram is compared with the adaptive multiple taper methods and hybrid methods. It is found that a hybrid method, which uses four orthogonal tapers and then applies a kernel smoother, performs best. For 300 point data segments, even an optimized smoothed tapered periodogram has a 24% larger relative RMSE than the hybrid method. Two new adaptive multitaper weightings which outperform Thomson's original adaptive weighting are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.870794
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  • 3
    Electronic Resource
    Electronic Resource
    Eulerian analysis of concentration fluctuations in dispersing plumes and puffs (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 9 (1997), S. 2349-2354 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A recent analysis of the second-order moments of concentration fluctuations in dispersing plumes and puffs has been reexamined in order to obtain a picture of the budget for the second-order moments. We have compared this picture with the parametrizations of the transport and dissipation of concentration variance in a second-order closure model. The comparison lends support to the form of the second-order closure parametrizations and also provides a constraint on the constants used in the parametrization of the dissipation of concentration variance, thereby providing the means to reduce the number of tunable constants in the model by one. The constraint implies that the constants must differ for area, line and point sources and implies that finding a good parametrization of the dissipation of concentration variance for arbitrary source geometries may be difficult.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.869355
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  • 4
    Electronic Resource
    Electronic Resource
    The separation of particle pairs in the eddy-damped quasinormal Markovian approximation (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 8 (1996), S. 642-644 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The implications of the eddy-damped quasinormal Markovian (EDQNM) approximation for the separation of particle pairs in (three-dimensional) inertial subrange turbulence are explored. In particular the EDQNM equations are solved for the particle separation probability distribution, without making the usual approximation of replacing the damping time scales by their large time asymptotic form. A number of properties of the separation probability distribution that are of significance for the prediction of concentration fluctuations are calculated. The values show quite large departures from the values obtained with the large time form of the damping time scales. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.868848
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  • 5
    Electronic Resource
    Electronic Resource
    INTERNATIONAL DEMOCRACY (1937)
    Oxford, UK : Blackwell Publishing Ltd
    The @political quarterly 8 (1937), S. 0 
    Details
    ISSN: 1467-923X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Political Science
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1467-923X.1937.tb00921.x
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  • 6
    Electronic Resource
    Electronic Resource
    THE IMPLICATIONS OF PUBLIC MORALITY (1936)
    Oxford, UK : Blackwell Publishing Ltd
    The @political quarterly 7 (1936), S. 0 
    Details
    ISSN: 1467-923X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Political Science
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1467-923X.1936.tb01288.x
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  • 7
    Electronic Resource
    Electronic Resource
    HOW INTERNATIONAL IS COLONIAL TRUSTEESHIP ? (1947)
    Oxford, UK : Blackwell Publishing Ltd
    The @political quarterly 18 (1947), S. 0 
    Details
    ISSN: 1467-923X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Political Science
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1467-923X.1947.tb01073.x
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  • 8
    Electronic Resource
    Electronic Resource
    Shapiro, David: The Right in France, 1890–1919: Three Studies : Chatto and Windus, 1962 (1963)
    Cambridge : Cambridge University Press
    The @historical journal 6 (1963), S. 147-149 
    Details
    ISSN: 0018-246X
    Source: Cambridge Journals Digital Archives
    Topics: History
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1017/S0018246X0000100X
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  • 9
    Electronic Resource
    Electronic Resource
    THE APPLICATION OF TWO FREE-CHOICE PROFILE METHODS TO INVESTIGATE THE SENSORY CHARACTERISTICS OF CHOCOLATE (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 3 (1989), S. 0 
    Details
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The concept of free-choice profiling allows untrained assessors to participate in sensory profiling. However, it is sometimes the case that such individuals are unable to describe what they perceive when the samples are presented in the isolation of the sensory testing booths. This paper reports an experiment to compare the usual free-choice profile procedure, with a more structured approach based on Kelly's repertory grid method. Generalized Procrustes analysis was used to analyse the data. The sample configurations obtained from both approaches were very similar, as were the interpretations of the main perceptual dimensions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-459X.1989.tb00450.x
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  • 10
    Electronic Resource
    Electronic Resource
    Workhouse to Nursing Home: Residential Care of elderly people in England since 1840 (1983)
    Cambridge : Cambridge University Press
    Ageing and society 3 (1983), S. 43-69 
    Details
    ISSN: 0144-686X
    Source: Cambridge Journals Digital Archives
    Topics: Medicine , Sociology
    Notes: Statistics of the movement of elderly people through institutions of care have attracted little attention from present-day researchers, and none at all from historians. The intention in this paper is to indicate some of the analyses which the historian can make, to explore the changes and continuities in the inmate populations of institutions over 120 years, and to speculate upon the reasons for the higher and lower incidences of residential care amongst the old in specific periods. The questions of interest here are how many and which groups amongst the old have been in care in different periods; how many people would ever find their way into institutions in old age: at what ages would they enter; for how long would they stay in care; would they die in care or leave for other reasons; what are the reasons for taking the elderly in to care; and what does all this tell us about the society in question.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1017/S0144686X00009831
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