Marginal instability threshold condition of the aperiodic ordinary mode in equal-mass plasmas

2014 ◽  
Vol 21 (10) ◽  
pp. 104504 ◽  
Author(s):  
S. Vafin ◽  
R. Schlickeiser ◽  
P. H. Yoon
Keyword(s):  
Equal Mass ◽  
Instability Threshold ◽  
Threshold Condition ◽  
Ordinary Mode

scholarly journals A universal mirror wave-mode threshold condition for non-thermal space plasma environments

2002 ◽  
Vol 9 (2) ◽  
pp. 75-78 ◽  
Author(s):  
M. P. Leubner ◽  
N. Schupfer
Keyword(s):  
Wave Mode ◽  
Instability Threshold ◽  
Velocity Space ◽  
Space Distribution ◽  
Instability Criterion ◽  
Threshold Condition ◽  
Magnetic Fluctuations ◽  
Plasma Parameters ◽  
Energy Principle ◽  
Loss Cone

Abstract. Magnetic fluctuations are recognized in a large variety of space plasmas by increasingly high resolution, in situ observations as mirror wave mode structures. A typical requirement for the excitation of mirror modes is a dominant perpendicular pressure in a high-beta plasma environment. Contrary, we demonstrate from a realistic kinetic analysis how details of the velocity space distributions are of considerable significance for the instability threshold. Introducing the most common characteristics of observed ion and electron distributions by a mixed suprathermal-loss-cone, we derive a universal mirror instability criterion from an energy principle for collisionless plasmas. As a result, the transition from two temperature Maxwellians to realistic non-thermal features provides a strong source for the generation of mirror wave mode activity, reducing drastically the instability threshold. In particular, a number of space-related examples illuminate how the specific structure of the velocity space distribution dominates as a regulating excitation mechanism over the effects related to changes in the plasma parameters.

Proton Cyclotron Instability Threshold Condition of Suprathermal Protons by Kappa Distribution

2007 ◽  
Vol 9 (5) ◽  
pp. 545-549 ◽  
Author(s):  
Xiao Fuliang ◽  
Zhou Qinghua ◽  
He Huiyong ◽  
Tang Lijun ◽  
Fang Jiayuan
Keyword(s):  
Instability Threshold ◽  
Threshold Condition ◽  
Kappa Distribution ◽  
Cyclotron Instability ◽  
Proton Cyclotron

EXPERIMENTAL ASSESSMENT OF THE NANOPARTICLES TOXICITY OF NICKEL OXIDE IN TWO SIZES IN THE SUBCHRONIC EXPERIMENT

2018 ◽  
pp. 30-35
Author(s):  
M.P. Sutunkova ◽  
B.A. Katsnelson ◽  
L.I. Privalova ◽  
S.N. Solovjeva ◽  
V.B. Gurvich ◽  
...  
Keyword(s):  
Nickel Oxide ◽  
Nervous Activity ◽  
Equal Mass ◽  
The Body ◽  
Subchronic Toxicity ◽  
Physiological Mechanisms ◽  
Nickel Oxide Nanoparticles ◽  
The Relationship ◽  
The Brain ◽  
Nanoparticles Toxicity

We conducted a comparative assessment of the nickel oxide nanoparticles toxicity (NiO) of two sizes (11 and 25 nm) according to a number of indicators of the body state after repeated intraperitoneal injections of these particles suspensions. At equal mass doses, NiO nanoparticles have been found to cause various manifestations of systemic subchronic toxicity with a particularly pronounced effect on liver, kidney function, the body’s antioxidant system, lipid metabolism, white and red blood, redox metabolism, spleen damage, and some disorders of nervous activity allegedly related to the possibility of nickel penetration into the brain from the blood. The relationship between the diameter and toxicity of particles is ambiguous, which may be due to differences in toxicokinetics, which is controlled by both physiological mechanisms and direct penetration of nanoparticles through biological barriers and, finally, unequal solubility.

scholarly journals Linearization threshold condition and stability analysis of a stochastic dynamic model of one-machine infinite-bus (OMIB) power systems

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Lijuan Li ◽  
Yongdong Chen ◽  
Bin Zhou ◽  
Hongliang Liu ◽  
Yongfei Liu
Keyword(s):  
Power Systems ◽  
Power System ◽  
Dynamic Model ◽  
Threshold Model ◽  
Security Evaluation ◽  
Stochastic Dynamic ◽  
Threshold Condition ◽  
Stochastic Excitation ◽  
Predictor Corrector ◽  
One Machine

AbstractWith the increase in the proportion of multiple renewable energy sources, power electronics equipment and new loads, power systems are gradually evolving towards the integration of multi-energy, multi-network and multi-subject affected by more stochastic excitation with greater intensity. There is a problem of establishing an effective stochastic dynamic model and algorithm under different stochastic excitation intensities. A Milstein-Euler predictor-corrector method for a nonlinear and linearized stochastic dynamic model of a power system is constructed to numerically discretize the models. The optimal threshold model of stochastic excitation intensity for linearizing the nonlinear stochastic dynamic model is proposed to obtain the corresponding linearization threshold condition. The simulation results of one-machine infinite-bus (OMIB) systems show the correctness and rationality of the predictor-corrector method and the linearization threshold condition for the power system stochastic dynamic model. This study provides a reference for stochastic modelling and efficient simulation of power systems with multiple stochastic excitations and has important application value for stability judgment and security evaluation.

scholarly journals Fooling the size–weight illusion—Using augmented reality to eliminate the effect of size on perceptions of heaviness and sensorimotor prediction

2021 ◽  
Author(s):  
Nina Rohrbach ◽  
Joachim Hermsdörfer ◽  
Lisa-Marie Huber ◽  
Annika Thierfelder ◽  
Gavin Buckingham
Keyword(s):  
Augmented Reality ◽  
Visual Cues ◽  
Equal Mass ◽  
Small Object ◽  
Verbal Reports ◽  
Fully Integrated ◽  
Head Mounted Display ◽  
Lift Off ◽  
Cognitive Knowledge ◽  
Weight Illusion

AbstractAugmented reality, whereby computer-generated images are overlaid onto the physical environment, is becoming significant part of the world of education and training. Little is known, however, about how these external images are treated by the sensorimotor system of the user – are they fully integrated into the external environmental cues, or largely ignored by low-level perceptual and motor processes? Here, we examined this question in the context of the size–weight illusion (SWI). Thirty-two participants repeatedly lifted and reported the heaviness of two cubes of unequal volume but equal mass in alternation. Half of the participants saw semi-transparent equally sized holographic cubes superimposed onto the physical cubes through a head-mounted display. Fingertip force rates were measured prior to lift-off to determine how the holograms influenced sensorimotor prediction, while verbal reports of heaviness after each lift indicated how the holographic size cues influenced the SWI. As expected, participants who lifted without augmented visual cues lifted the large object at a higher rate of force than the small object on early lifts and experienced a robust SWI across all trials. In contrast, participants who lifted the (apparently equal-sized) augmented cubes used similar force rates for each object. Furthermore, they experienced no SWI during the first lifts of the objects, with a SWI developing over repeated trials. These results indicate that holographic cues initially dominate physical cues and cognitive knowledge, but are dismissed when conflicting with cues from other senses.

Thresholds in Flux—the Standard for Ascertaining the Requirement of Organization for Armed Groups under International Humanitarian Law

2020 ◽  
Author(s):  
Yutaka Arai-Takahashi
Keyword(s):  
Armed Conflict ◽  
Geneva Convention ◽  
Prisoners Of War ◽  
Organizational Level ◽  
International Humanitarian Law ◽  
Threshold Condition ◽  
Special Importance ◽  
Humanitarian Law ◽  
Armed Groups ◽  
International Criminal Tribunals

Abstract The requirement of organization is supposed to be of special importance in international humanitarian law (IHL). In the situation of international armed conflict (IAC), this requirement is implicit as part of the collective conditions to be fulfilled by irregular/independent armed groups to enable their members to claim the prisoners of war status under Article 4 A(2) of the Third Geneva Convention. In a non-international armed conflict (NIAC), the eponymous requirement serves, alongside the requirement of intensity of violence, as the threshold condition for ascertaining the onset of a NIAC. While the requirement of organization has not caused much of disputes in IACs, the international criminal tribunals have shown a willingness to examine scrupulously if armed groups in NIACs are sufficiently organized. Still, this article argues that there is need for a nuanced assessment of the organizational level of an armed group in some specific phases of the ongoing armed conflict whose legal character switches (from an NIAC to an IAC, vice-versa, and from a NIAC to a law-enforcement model). It explores what rationales and argumentative model may be adduced to explain such varying standards for organization in different contexts.

DFB Lasers with Tilted Waveguide for Multi-Wavelength Generation

2007 ◽  
Vol 31 ◽  
pp. 36-38 ◽  
Author(s):  
Lip Fah Chong ◽  
Jing Hua Teng ◽  
Ee Leong Lim ◽  
Norman Soo Seng Ang ◽  
J.R. Dong ◽  
...  
Keyword(s):  
Single Mode ◽  
Distributed Feedback ◽  
Couple Mode ◽  
Threshold Condition ◽  
Couple Mode Theory ◽  
Gain Margin ◽  
Ridge Waveguides ◽  
Multi Wavelength ◽  
Dfb Laser ◽  
Lasing Frequency

In this paper, we present the theoretical investigation of index-coupled distributed feedback (DFB) laser with tilted single mode ridge waveguides. By tilting part of the ridge waveguide in various degrees, DFB laser with manifold effective grating periods can be realized. The structure is analyzed using couple mode theory in matrix form based on threshold analysis. Important parameters of DFB laser like resonant frequency and threshold gains are obtained by solving the eigen-equation. The results indicate not only that the lasing frequency is modulated by the waveguide titling angle, but also large Gain Margin (GM) can be achieved at the threshold condition which enhance the stable single mode operation in index-coupled DFB laser.

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