Analysis of the two-dimensional turbulence in pure electron plasmas by means of advanced statistical techniques

2013 ◽  
Author(s):  
M. Romé ◽  
F. Lepreti ◽  
G. Maero ◽  
R. Pozzoli ◽  
A. Vecchio ◽  
...  
Keyword(s):  
Statistical Techniques ◽  
Two Dimensional ◽  
Electron Plasmas

Scaling properties and intermittency of two-dimensional turbulence in pure electron plasmas

2013 ◽  
Vol 87 (6) ◽  
Author(s):  
F. Lepreti ◽  
M. Romé ◽  
G. Maero ◽  
B. Paroli ◽  
R. Pozzoli ◽  
...  
Keyword(s):  
Two Dimensional ◽  
Scaling Properties ◽  
Electron Plasmas

Investigating the Circumplex Structure of the Portrait Values Questionnaire (PVQ)

2005 ◽  
Vol 26 (4) ◽  
pp. 185-193 ◽  
Author(s):  
Andreas Hinz ◽  
Elmar Brähler ◽  
Peter Schmidt ◽  
Cornelia Albani
Keyword(s):  
Multidimensional Scaling ◽  
Statistical Methods ◽  
Empirical Data ◽  
Representative Sample ◽  
Factorial Analysis ◽  
Dimensional Structure ◽  
Statistical Techniques ◽  
German Population ◽  
Two Dimensional ◽  
Varimax Rotation

Abstract. The Portrait Values Questionnaire (PVQ) comprises 10 basic values that guide behavior. The Schwartz model postulates that these 10 values build a circumplex structure. We examined the PVQ with respect to its dimensional structure using a representative sample (N = 1896) of the German population. The results of three widely used analyses were compared: multidimensional scaling, factorial analysis (with varimax rotation) of raw scores, and factorial analysis with ipsative values. Furthermore, rank correlations between the theoretically assumed circular distances and the empirical data were calculated. The analyses confirmed that the 10 dimensions of the PVQ can be depicted in a two-dimensional plane. However, the statistical techniques chosen yielded different arrangements of the 10 values in the plane. All statistical methods failed to confirm the circumplex structure postulated by Schwartz. Nevertheless, dimensions of higher order that condense the 10 dimensions can be derived for applications of the PVQ.

Experimental study of the stability and dynamics of a two-dimensional ideal vortex under external strain

2018 ◽  
Vol 848 ◽  
pp. 256-287 ◽  
Author(s):  
N. C. Hurst ◽  
J. R. Danielson ◽  
D. H. E. Dubin ◽  
C. M. Surko
Keyword(s):  
Ideal Fluid ◽  
Experimental Studies ◽  
Quantitative Agreement ◽  
Two Dimensions ◽  
Global Dynamics ◽  
Two Dimensional ◽  
Plasma Dynamics ◽  
Electron Plasmas ◽  
Precise Control ◽  
The Stability

The dynamics of two-dimensional (2-D) ideal fluid vortices is studied experimentally in the presence of an irrotational strain flow. Laboratory experiments are conducted using strongly magnetized pure electron plasmas, a technique which is made possible by the isomorphism between the drift–Poisson equations describing plasma dynamics transverse to the field and the 2-D Euler equations describing an ideal fluid. The electron plasma system provides an excellent opportunity to study the dynamics of a 2-D Euler fluid due to weak dissipation and weak 3-D effects, simple diagnosis and precise control. The plasma confinement apparatus used here was designed specifically to study vortex dynamics under the influence of external flow by applying boundary conditions in two dimensions. Additionally, vortex-in-cell simulations are carried out to complement the experimental results and to extend the parameter range of the studies. It is shown that the global dynamics of a quasi-flat vorticity profile is in good quantitative agreement with the theory of a piecewise-constant elliptical patch of vorticity, including the equilibria, dynamical orbits and stability properties. Deviations from the elliptical patch theory are observed for non-flat vorticity profiles; they include inviscid damping of the orbits and modified stability limits. The dependence of these phenomena on the flatness of the initial profile is discussed. The relationship of these results to other theoretical, numerical and experimental studies is also discussed.

scholarly journals Turbulence and transport in two-dimensional magnetized electron plasmas

2008 ◽  
Vol 15 (4) ◽  
pp. 042312
Author(s):  
Dastgeer Shaikh ◽  
P. K. Shukla
Keyword(s):  
Two Dimensional ◽  
Electron Plasmas

Two-dimensional macroscopic shapes of lithium ion and electron plasmas after elapse of two-fluid plasma state

2018 ◽  
Author(s):  
Shohei Yamada ◽  
Haruhiko Himura ◽  
Toshiki Kato ◽  
Shigehumi Okada ◽  
Akio Sanpei ◽  
...  
Keyword(s):  
Lithium Ion ◽  
Two Dimensional ◽  
Electron Plasmas ◽  
Plasma State ◽  
Two Fluid ◽  
Two Fluid Plasma

Spectrophotometric measurements of objective-prism spectra

1966 ◽  
Vol 24 ◽  
pp. 118-119
Author(s):  
Th. Schmidt-Kaler
Keyword(s):  
Progress Report ◽  
Two Dimensional ◽  
Objective Prism ◽  
Made In

I should like to give you a very condensed progress report on some spectrophotometric measurements of objective-prism spectra made in collaboration with H. Leicher at Bonn. The procedure used is almost completely automatic. The measurements are made with the help of a semi-automatic fully digitized registering microphotometer constructed by Hög-Hamburg. The reductions are carried out with the aid of a number of interconnected programmes written for the computer IBM 7090, beginning with the output of the photometer in the form of punched cards and ending with the printing-out of the final two-dimensional classifications.

Introductory paper

1966 ◽  
Vol 24 ◽  
pp. 3-5
Author(s):  
W. W. Morgan
Keyword(s):  
Line Intensity ◽  
Classification Scheme ◽  
Two Dimensional ◽  
Spectral Classification ◽  
Dimensional Array ◽  
Rr Lyrae ◽  
Metallic Line ◽  
Introductory Paper ◽  
Parameter Varying ◽  
Definition Of

1. The definition of “normal” stars in spectral classification changes with time; at the time of the publication of theYerkes Spectral Atlasthe term “normal” was applied to stars whose spectra could be fitted smoothly into a two-dimensional array. Thus, at that time, weak-lined spectra (RR Lyrae and HD 140283) would have been considered peculiar. At the present time we would tend to classify such spectra as “normal”—in a more complicated classification scheme which would have a parameter varying with metallic-line intensity within a specific spectral subdivision.

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