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  • 1
    Electronic Resource
    Electronic Resource
    Effect of oxygen on the growth of (101¯0) GaN surfaces: The formation of nanopipes (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 3530-3532 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Local density–functional methods are used to examine the behavior of O and O-related defect complexes on the walls of nanopipes in GaN. We find that O has a tendency to segregate to the (101¯0) surface and identify the gallium vacancy surrounded by three oxygen impurities [VGa–(ON)3] to be a particularly stable and electrically inert complex. We suggest that during Stranski–Krastanow growth, when interisland spaces shrink, these defects reach a critical concentration beyond which further growth is prevented and nanopipes are formed. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.122826
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  • 2
    Electronic Resource
    Electronic Resource
    The weather attractor over very short timescales (1988)
    [s.l.] : Nature Publishing Group
    Nature 333 (1988), S. 545-547 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] According to the theory of dynamical systems6, the evolution of a system can be described by trajectories in the state space. The coordinates of the state space are defined by the variables needed to completely describe the evolution of the system. Each trajectory in the state space represents the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/333545a0
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  • 3
    Electronic Resource
    Electronic Resource
    Structural and Electrical Properties of Threading Dislocations in GaN (1997)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 258-263 (Dec. 1997), p. 1203-1210 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/03/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.258-263.1203.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Do bidecadal oscillations exist in the global temperature record? (1991)
    [s.l.] : Nature Publishing Group
    Nature 353 (1991), S. 551-553 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Because of the importance of the problem, considerable efforts have been made to extract information about trends, periodicities, natural variability and noise from the records5"8. Ghil and Vautard (GV hereafter)4 applied singular spectrum analysis (SSA) to one of the available records. This ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/353551a0
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  • 5
    Electronic Resource
    Electronic Resource
    Low-frequency oscillation (1994)
    [s.l.] : Nature Publishing Group
    Nature 372 (1994), S. 507-508 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR - The singular spectrum approach (SSA) has recently been used to identify a low-frequency oscillation in the global surface air temperature record1. SSA2'3 considers M lagged copies of a series X(t) sampled at equal intervals r, Xt= X(tQ + ZT), i = 1, TV, and estimates the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/372507b0
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  • 6
    Electronic Resource
    Electronic Resource
    Nonlinear prediction as a way of distinguishing chaos from random fractal sequences (1992)
    [s.l.] : Nature Publishing Group
    Nature 358 (1992), S. 217-220 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In the past, the identification of chaotic dynamics from time series relied heavily on the estimation of the dimension of the underlying attractor3"6, but this approach has certain drawbacks. First, the algorithms involved7'8 require a large number of data points, which are often not ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/358217a0
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  • 7
    Electronic Resource
    Electronic Resource
    Oscillating global temperature (1992)
    [s.l.] : Nature Publishing Group
    Nature 356 (1992), S. 751-751 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR - Ghil and Vautard1 applied singular spectrum analysis to a global temperature data set and claimed the existence of a 20-year oscillation corresponding to a pair of high variance empirical orthogonal functions (EOFs). Subsequently, we2 performed a sensitivity analysis considering various ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/356751b0
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  • 8
    Electronic Resource
    Electronic Resource
    The use of significance limits in graphical data representations (1991)
    Springer
    Cellular and molecular life sciences 47 (1991), S. 221-224 
    Details
    ISSN: 1420-9071
    Keywords: Uncertainty limits ; error bars ; graphical t-test ; significance limits
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Significance limits are proposed as an alternative to the use of standard deviation, standard error, or confidence or tolerance limits when experimental data are presented in a graphical form. This measurement of uncertainty allows graphical t-tests to be used both for the estimation of data variance and for an approximate statistical comparison between two or more data sets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01958140
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  • 9
    Electronic Resource
    Electronic Resource
    A note on the spatial structure of the covariability of observed Northern Hemisphere surface air temperatures (1991)
    Springer
    Pure and applied geophysics 137 (1991), S. 133-146 
    Details
    ISSN: 1420-9136
    Keywords: Hemispheric temperature records ; factor analysis ; long-term trends
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The spatial structure of covariability in the surface air temperature records of the last 109 years is examined using factor analysis. From the results it is indicated that the Northern Hemisphere can be objectively divided into 15 regions with each region having a similar covariance structure of surface air temperatures. From such a division it is noted that warming is evident over 11 out of the 15 regions. The strongest warming is not, however, confined to specific latitudinal belts, for example, the tropics or the arctic, nor is the strongest warming confined to a specific continent. As a consequence of the coarse spatial dsitribution of available data, results should be considered preliminary.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00876893
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  • 10
    Electronic Resource
    Electronic Resource
    The relationship between coherent structures and heat transfer processes in the initial region of a round jet (1998)
    Springer
    Experiments in fluids 24 (1998), S. 225-237 
    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  This paper describes an experimental study of the relationship between coherent vortical structures and the intensity of heat transport in the initial region of a round, free jet. Simultaneous measurements of velocity and temperature were taken with a four-wire combined probe in a jet that was acoustically stimulated with a frequency corresponding to the jet-column mode. The obtained results suggest that the mutual phase relations between oscillatory and random components of velocity and temperature lead to substantial intensification of the radial heat transport. Due to the same reason the longitudinal heat flux does not reveal a significant change in the presence of coherent structures and, as a result, a much wider spread of the temperature field in comparison with velocity may be observed as a characteristic feature of this flow. It was also observed that heat transfer processes are realized in substantial part by random turbulence generated due to the action of coherent motion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003480050169
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