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K-P-Burgers equation in negative ion-rich relativistic dusty plasma including the effect of kinematic viscosity

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Chinese Physics B 2016年第10期25卷 215-221页

作者： A n dev M K deka J Sarma d Saikia n C Adhikary department of Mathematics Siksha ‘O' Anusandhan University department of Applied Sciences Institute of Science and Technology Gauhati University department of Mathematics R G Baruah College Physical Sciences division Institute of Advanced Study in Science and TechnologyVigyan Path Paschim Boragaon

The stationary solution is obtained for the K–P–Burgers equation that describes the nonlinear propagations of dust ion acoustic waves in a multi-component, collisionless, un-magnetized relativistic dusty plasma consisting of electrons, positive and negative ions in the presence of charged massive dust grains. Here, the Kadomtsev–Petviashvili(K–P) equation, threedimensional(3d) Burgers equation, and K–P–Burgers equations are derived by using the reductive perturbation method including the effects of viscosity of plasma fluid, thermal energy, ion density, and ion temperature on the structure of a dust ion acoustic shock wave(dIASW). The K–P equation predictes the existences of stationary small amplitude solitary wave,whereas the K–P–Burgers equation in the weakly relativistic regime describes the evolution of shock-like structures in such a multi-ion dusty plasma.

关键词： K–P–Burgers equation negative ion relativistic plasma reductive perturbation method

Motor Imagery and Error Related Potential Induced Position Control of a Robotic Arm

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IEEE/CAA Journal of Automatica Sinica 2017年第4期4卷 639-650页

作者： Saugat Bhattacharyya Amit Konar d.n.Tibarewala BCI-LIFT Project Team Institut National de Recherche en Informatique et en Automatique (INRIA) IEEE Artificial Intelligence Laboratory ETCE DepartmentJadavpur University Centre for Healthcare Science and Technology Indian Institute of Engineering Science and Technology

The paper introduces an electroencephalography(EEG) driven online position control scheme for a robot arm by utilizing motor imagery to activate and error related potential(ErrP) to stop the movement of the individual links, following a fixed(pre-defined) order of link selection. The right(left)hand motor imagery is used to turn a link clockwise(counterclockwise) and foot imagery is used to move a link forward. The occurrence of ErrP here indicates that the link under motion crosses the visually fixed target position, which usually is a plane/line/point depending on the desired transition of the link across 3d planes/around 2d lines/along 2d lines respectively. The imagined task about individual link's movement is decoded by a classifier into three possible class labels: clockwise, counterclockwise and no movement in case of rotational movements and forward, backward and no movement in case of translational movements. One additional classifier is required to detect the occurrence of the ErrP signal, elicited due to visually inspired positional link error with reference to a geometrically selected target position. Wavelet coefficients and adaptive autoregressive parameters are extracted as features for motor imagery and ErrP signals respectively. Support vector machine classifiers are used to decode motor imagination and ErrP with high classification accuracy above 80%. The average time taken by the proposed scheme to decode and execute control intentions for the complete movement of three links of a robot is approximately33 seconds. The steady-state error and peak overshoot of the proposed controller are experimentally obtained as 1.1% and4.6% respectively.

关键词： Brain-computer interfacing(BCI) error related potential(Errp) motor imagery decoding position control of a robot arm

Analysis of non-ionized substance losses in experiments on plasma mass separation

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Plasma Science and Technology 2022年第8期24卷 124-129页

作者： R A USMAnOV n n AnTOnOV A V GAVRIKOV G d LIZIAKIn A d MELnIKOV A P OILER V P SMIRnOV R A TIMIRKHAnOV L S VOLKOV n A VOROnA Laboratory of Electrophysical and Plasma devices Joint Institute for High TemperatureMoscow 125412Russia

Plasma mass separation requires a lot of diagnostic techniques that not only demonstrate the separation effect but also show the efficiency of the *** the test experiments,plasma flux to be separated may contain neutral particles that avoid the separation process due to their insensitivity to electromagnetic *** present the diagnostics of the lost substance in experiments on plasma mass *** obtained data of the diagnostics helps determine the law of particle evaporation from the plasma *** show that neutral flux is unable to distort the result of separation *** presented approach can be used in experiments aimed at enhancing the separation effect and achieving target productivity for industry applications.

关键词： plasma mass separation plasma diagnostics lead silver film deposition

Effect of Vanadium Microalloying on the HAZ Microstructure and Properties of Low Carbon Steels

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Journal of Iron and Steel Research International 2011年第S1期18卷 393-403页

作者： Milbourn d Baker T n Vanitec ltd Winterton HouseHigh StreetWesterhamKentTN16 1AQUK Metallurgy and Engineering Materials Group Department of Mechanical EngineeringUniversity of StrathclydeG1 1XNUK

Four Steels,C-Mn-0.05V,C-Mn-0.11V,C-Mn-0.03nb and C-Mn were subjected to heat treatment to simulate the microstructure of a coarse grained heat affected zone (CGHAZ) and an intercritically reheated coarse grained heat affected zone (ICCGHAZ).This involved reheating to 1350°C,rapid cooling (Δt 8/5 =24s) to room temperature and then reheating to either 750°C or 800°*** toughness of the HAZs was assessed using both Charpy and CTOd *** features were characterised by optical,scanning` and transmission electron *** examinations of the Charpy and CTOd specimens were carried out to understand the micromechanism of fracture under different microstructural and test *** CGHAZ toughness was similar for the steels except that Steel C-Mn-0.05V had a slightly lower ITT compared to the *** toughness deteriorated in the ICCGHAZ for all the steels,again Steel C-Mn-0.05V had a superior toughness compared to the other three steels in both ICCGHAZ *** the level of vanadium to 0.11% caused a decrease in ICCGHAZ *** C-Mn-nb exhibited a greater degradation of impact toughness after the intercritical *** presence of M-A constituents was the dominant factor in determining the toughness of the *** size and area fraction of the M-A constituents were the smallest in Steel *** vanadium level to 0.11% resulted in a greater area fraction of the M-A constituents,larger average and maximum sizes of M-A particles,and significantly more fields containing the *** addition of 0.031% nb produced the largest M-A particles and the greatest area fraction for the steels tested.

关键词： vanadium microalloyed steel coarse grained heat affected zone intercritically reheated coarse grained heat affected zone martensite-austenite constitute heat affect zone toughness

COMPLEX COnCEPT LATTICES FOR SIMULATInG HUMAn PREdICTIOn In SPORT

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Journal of Systems Science & Complexity 2013年第1期26卷 117-136页

作者： ARAndA-CORRAL Gonzalo A BORREGO-díAZ Joaquín GALán-PáEZ Juan Universidad de Huelva.department of Information Technology Crta.Palos de La Frontera s/n.21819 Palos de La Frontera Universidad de Sevilla.department of Computer Science and Artificial Intelligence Avda.Reina Mercedes s/n.41012 Sevilla

In order to address the study of complex systems,the detection of patterns in their dynamics could play a key role in understanding their *** particular,global patterns are required to detect emergent concepts and trends,some of them of a qualitative *** concept analysis(FCA) is a theory whose goal is to discover and extract knowledge from qualitative data(organized in concept lattices).In complex environments,such as sport competitions,the large amount of information currently available turns concept lattices into complex *** authors analyze how to apply FCA reasoning in order to increase confidence in sports predictions by means of detecting regularities from data through the management of intuitive and natural attributes extracted from publicly available *** complexity of concept lattices-considered as networks with complex topological structure- is *** is applied to building a knowledge based system for confidence-based reasoning,which simulates how humans tend to avoid the complexity of concept networks by means of bounded reasoning skills.

关键词： Bounded rationality complex networks formal concept analysis sport forecasting.

A comprehensive investigation on nonlinear vibration and bending characteristics of bio-inspired helicoidal laminated composite structures

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Applied Mathematics and Mechanics(English Edition) 2025年第1期46卷 81-100页

作者： S.SAURABH R.KIRAn d.SInGH R.VAISH V.S.CHAUHAn School of Mechanical and Materials Engineering Indian Institute of Technology Mandi

Bio-inspired helicoidal composite laminates, inspired by the intricate helical structures found in nature, present a promising frontier for enhancing the mechanical properties of structural designs. Hence, this study provides a comprehensive investigation into the nonlinear free vibration and nonlinear bending behavior of bio-inspired composite plates. The inverse hyperbolic shear deformation theory(IHSdT) of plates is employed to characterize the displacement field, with the incorporation of Green-Lagrange nonlinearity. The problem is modeled using the C0finite element method(FEM), and an in-house code is developed in the MATLAB environment to solve it numerically. Various helicoidal layup configurations including helicoidal recursive(HR), helicoidal exponential(HE), helicoidal semi-circular(HS), linear helicoidal(LH), and Fibonacci helicoidal(FH)with different layup sequences and quasi-isotropic configurations are studied. The model is validated, and parametric studies are conducted. These studies investigate the effects of layup configurations, side-to-thickness ratio, modulus ratios, boundary conditions, and loading conditions at different load amplitudes on the nonlinear vibration and nonlinear bending behaviors of bio-inspired composite plates. The results show that the laminate sequence exerts a substantial impact on both nonlinear natural frequencies and nonlinear bending behaviors. Moreover, this influence varies across different side-to-thickness ratios and boundary conditions of the bio-inspired composite plate.

关键词： finite element method (FEM) nonlinear Green-Lagrange inverse hyperbolic shear deformation theory (IHSdT) bio-inspired composite plate helicoidal O322

THE STRESS-EnERGY TEnSOR And POHOZAEV'S IdEnTITY FOR SYSTEMS

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Acta Mathematica Scientia 2012年第1期32卷 433-439页

作者： n.d.Alikakos A.C.Faliagas department of Mathematics University of Athens

Utilizing stress-energy tensors which allow for a divergence-free formulation, we establish Pohozaev＇s identity for certain classes of quasilinear systems with variational structure.

关键词： calculus of variations stress-energy tensor p-Lapacian minimal surface

Control strategy for seamless transition from islanded to interconnected operation mode of microgrids

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Journal of Modern Power Systems and Clean Energy 2017年第2期5卷 169-176页

作者： C.n.PAPAdIMITRIOU V.A.KLEFTAKIS n.d.HATZIARGYRIOU department of Electrical and Computer Engineering National Technical University of Athens(NTUA)AthensGreece

Microgrids can operate either interconnected to the utility grid or disconnected forming an island. The transition between these modes can cause transient overcurrents or power oscillations jeopardizing the equipment safety or the system stability. This paper proposes a local multi agent control method for a seamless transfer between the islanded and interconnected modes of operation with agents implemented into the microgrid central switch(MCS) and into the microsources inverters. The MCS agent supervises the grid status and controls the switch for the transition of the microgrid through the different operation modes, while it communicates locally with the inverter agents of the microsources. The inverter agents undertake the synchronization process in case of reconnecting and change the inverter control mode depending on the grid status. Simulation and experimental results are presented to show the performance and feasibility of the proposed strategy.

关键词： Microgrid Islanding Reconnection Agents Synchronization Control hardware-in-the-loop(CHIL)

Ion heat transport in electron cyclotron resonance heated L-mode plasma on the T-10 tokamak

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Plasma Science and Technology 2024年第4期26卷 52-60页

作者： V.A.KRUPIn M.R.nURGALIEV A.R.nEMETS I.A.ZEMTSOV S.d.SUnTSOV T.B.MYALTOn d.S.SERGEEV n.A.SOLOVEV d.V.SARYCHEV d.V.RYJAKOV S.n.TUGARInOV n.n.nAUMEnKO national Research Centre“Kurchatov Institute” Moscow 123182Russia Bauman Moscow State Technical University Moscow 105005Russia Institution“Project Center ITER” Moscow 123098Russia JSC“SOLAR” Minsk 220034Belarus

Anomalous ion heat transport is analyzed in the T-10 tokamak plasma heated with electron cyclotron resonance heating(ECRH) in second-harmonic extra-ordinary mode. Predictive modeling with empirical scaling for Ohmical heat conductivity shows that in ECRH plasmas the calculated ion temperature could be overestimated, so an increase of anomalous ion heat transport is required. To study this effect two scans are presented: over the EC resonance position and over the ECRH power. The EC resonance position varies from the high-field side to the low-field side by variation of the toroidal magnetic field. The scan over the heating power is presented with on-axis and mixed ECRH regimes. discharges with high anomalous ion heat transport are obtained in all considered regimes. In these discharges the power balance ion heat conductivity exceeds the neoclassical level by up to 10 times. The high ion heat transport regimes are distinguished by three parameters: the ratio Te/Ti, the normalized electron density gradient R/■, and the ion–ion collisionality νii~*. The combination of high Te/Ti, high νii~*, and R/■=6-10 results in values of normalized anomalous ion heat fluxes up to 10 times higher than in the low transport scenario.

关键词： tokamak L-mode electron cyclotron resonance heating ion heat transport