Plasma-Neutral Gas Interaction Effects on the Stability of Drift Modes

1977 ◽  
Vol 15 (5-6) ◽  
pp. 318-324 ◽  
Author(s):  
D E Ohlsson
Keyword(s):  
Interaction Effects ◽  
Neutral Gas ◽  
The Stability

Enhancing Sensitivity Diagnostics for Qualitative Comparative Analysis: A Combinatorial Approach

2016 ◽  
Vol 24 (1) ◽  
pp. 104-120 ◽  
Author(s):  
Alrik Thiem ◽  
Reto Spöhel ◽  
Adrian Duşa
Keyword(s):  
Comparative Analysis ◽  
Data Quality ◽  
Qualitative Comparative Analysis ◽  
Interaction Effects ◽  
Combinatorial Approach ◽  
Methodological Research ◽  
The Stability ◽  
Parameter Values

Sensitivity diagnostics has recently been put high on the agenda of methodological research into Qualitative Comparative Analysis (QCA). Existing studies in this area rely on the technique of exhaustive enumeration, and the majority of works examine the reactivity of QCA either only to alterations in discretionary parameter values or only to data quality. In this article, we introduce the technique of combinatorial computation for evaluating the interaction effects between two problems afflicting data quality and two discretionary parameters on the stability of QCA reference solutions. In this connection, we challenge a hitherto unstated assumption intrinsic to exhaustive enumeration, show that combinatorial computation permits the formulation of general laws of sensitivity in QCA, and demonstrate that our technique is most efficient.

Stability properties of cold mantle systems for current-driven modes

1980 ◽  
Vol 23 (3) ◽  
pp. 383-400
Author(s):  
D. Ohlsson
Keyword(s):  
Magnetic Field ◽  
Steady State ◽  
Stability Diagrams ◽  
Neutral Gas ◽  
Transverse Current ◽  
Laboratory Plasmas ◽  
State Models ◽  
The Stability ◽  
Moderate Magnetic Field ◽  
Parameter Ranges

The stability problem of the boundary regions of cold blanket systems with induced currents parallel to the lines of force is formulated. Particular interest is focused on two types of mode: first electrostatic modes driven by the combined effects of a transverse resistivity gradient due to a spatially non-uniform electron temperature and a longitudinal current, second electromagnetic kink-like modes driven by the torque arising from a transverse current density gradient and magnetic field perturbations. It is found that the combination of various dissipative and neutral gas effects introduces strong stabilizing effects within specific parameter ranges. For particular steady-state models investigated it is shown that these effects become of importance in laboratory plasmas at relatively high densities, low temperatures and moderate magnetic field strengths. Stability diagrams based on specific steady-state cold plasma blanket models will be presented.

scholarly journals Stability Analysis of Durum Wheat Genotypes by Regression Parameteres in Dryland Conditions

2014 ◽  
Vol 62 (5) ◽  
pp. 1049-1056 ◽  
Author(s):  
Mohtasham Mohammadi ◽  
Peyman Sharifi ◽  
Rahmatollah Karimizadeh
Keyword(s):  
Stability Analysis ◽  
Grain Yield ◽  
Durum Wheat ◽  
Triticum Turgidum ◽  
B Value ◽  
Interaction Effects ◽  
Ge Interaction ◽  
Wheat Genotypes ◽  
Cropping Seasons ◽  
The Stability

The objectives of this study were to estimate genotype × environment (GE) interaction effects and to determine the stable durum wheat (Triticum turgidum var. durum Desf.) genotypes for grain yield in warm winter areas of Iran. Twenty durum wheat genotypes, including 18 experimental lines and two local checks were evaluated during three cropping seasons (2004–2006) at five research sites. The combined analysis of variance indicated that the main effects of location and genotype and interaction effects of genotype × year, genotype × location and genotype × year × location were highly significant for grain yield. GE interaction was analyzed using linear regression techniques. There was considerable variation for grain yield among both genotypes and environments. Stability was estimated using the Eberhart and Russell method. Stability analysis of grain yield in different environments showed that the variance of genotypes and genotypes × environment (linear) interactions were significant. Due to the stability analysis, genotype 12 (D68-1-93A-1A//Ruff/Fg/3/Mtl-5/4/Lahn) indicated relatively minimum value for S2d and a b-value close to unity and hence, it may be considered stable for grain yield in all of the environments. The results showed that G10 (Bcr//Memo/goo) also favor for its stability in high yielding environments. The broad sense heritability was 77%, indicating selection should give a good response for grain yield.

The interaction between two coplanar dislocation-type cracks

1966 ◽  
Vol 292 (1428) ◽  
pp. 134-151 ◽  
Keyword(s):  
Cleavage Fracture ◽  
Interaction Effects ◽  
Crystalline Solids ◽  
Dislocation Type ◽  
Deformation Processes ◽  
Shaped Crack ◽  
Complete Fracture ◽  
The Stability

When crystalline solids exhibit cleavage fracture, the associated deformation processes produce wedge shaped microcracks and the criteria for their stability are of paramount importance when discussing the conditions for complete fracture of a solid. Previously, consideration has been given to the behaviour of an isolated wedge shaped crack, but little attention has been given to problems involving distributions of such cracks. The present paper examines the stability of two coplanar wedge shaped cracks, and demonstrates under what conditions interaction effects are important.

scholarly journals Specifics of Damping Evaluation in Rotating Machines

1996 ◽  
Author(s):  
Agnes Muszynska
Keyword(s):  
Dynamic Stiffness ◽  
Tangential Force ◽  
Stability Margin ◽  
Interaction Effects ◽  
Rotating Machines ◽  
Damping Force ◽  
Vibration Data ◽  
Lateral Modes ◽  
The Stability ◽  
Fluid Interaction

Focused on rotor lateral modes, the paper discusses specifics of damping evaluation in rotating machines. Rotors force the fluid trapped in small rotor-to-stator radial clearances to rotate in circumferential fashion. The fluid in circumferential motion generates a tangential force acting in feedback on the rotor. This force direction is opposite to that of damping force. The “effective damping” is, therefore, reduced or even nullified by the fluid interaction effects. The classical measures of damping in mechanical structures, such as Logarithmic Decrement and Amplification Factor, which are used to evaluate machine susceptibility to instability based on documented vibration data, have to be adjusted to include the fluid interaction effects. These measures now represent the measures of Quadrature Dynamic Stiffness (QDS). It is shown that they contain the expression defined as Stability Margin (or Nondimensional Stability Margin), derived from the stability condition of the rotor system. A simple model of isotropic rotor lateral vibrations is used to obtain the QDS measures.

Spectroluminescence measurements of the stability constants of CanUO2(CO3)3(4−2n)− complexes in NaClO4 medium and the investigation of interaction effects

2020 ◽  
Vol 49 (43) ◽  
pp. 15443-15460
Author(s):  
Chengming Shang ◽  
Pascal E. Reiller ◽  
Thomas Vercouter
Keyword(s):  
Stability Constants ◽  
Interaction Effects ◽  
Luminescence Spectroscopy ◽  
Time Resolved ◽  
The Stability

The stability constants of ternary calcium uranyl tricarbonate complexes, CaUO2(CO3)32− and Ca2UO2(CO3)3(aq), were determined in NaClO4 medium at various ionic strengths using time-resolved laser-induced luminescence spectroscopy (TRLS).

Open discussion

1982 ◽  
Vol 99 ◽  
pp. 605-613
Author(s):  
P. S. Conti
Keyword(s):  
Buenos Aires ◽  
Large Mass ◽  
List Type ◽  
Common Phenomenon ◽  
Open Discussion ◽  
The Stability ◽  
Ring Nebulae

Conti: One of the main conclusions of the Wolf-Rayet symposium in Buenos Aires was that Wolf-Rayet stars are evolutionary products of massive objects. Some questions:–Do hot helium-rich stars, that are not Wolf-Rayet stars, exist?–What about the stability of helium rich stars of large mass? We know a helium rich star of ∼40 MO. Has the stability something to do with the wind?–Ring nebulae and bubbles : this seems to be a much more common phenomenon than we thought of some years age.–What is the origin of the subtypes? This is important to find a possible matching of scenarios to subtypes.

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