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Data-driven containment control of discrete-time multi-agent systems via value iteration

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Science China(Information Sciences) 2020年第8期63卷 254-256页

作者： Zhinan PENG Jiangping HU Bijoy Kumar ghosh School of Automation Engineering University of Electronic Science and Technology of China Department of Mathematics and Statistics Texas Tech University

Dear editor,We consider a containment control problem for a linear discrete-time (DT) multi-agent system via reinforcement learning. Containment control(CC) of multi-agent networks has received extensive attention in the control community in recent years [1–4]. CC is motivated by natural phenomena and has potential and vital applications in practical engineering. For example, one applica-

关键词： containment control multi-agent systems distributed control linear systems optimal control

Dependence of fluid flow on cleat aperture distribution and aperture–length scaling: a case study from Gondwana coal seams of Raniganj Formation, Eastern India

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International Journal of Coal Science & Technology 2020年第1期7卷 133-146页

作者： Krishanu Bandyopadhyay Jyotirmoy Mallik Trishit ghosh Indian Institute of Science Education and Research BhopalIndia Coal India Limited.Asansol.India

Dimensions and mutual relationships amongst fracture(cleat)parameters such as maximum aperture width,average aperture width,length,spacing *** the connectivity within a fracture network and the fluid flow in a coal seam as the matrix permeability,here,is *** this paper,we document cleat size distributions and investigate length–aperture relationships from coals of Raniganj coalfield in Eastern *** coalfield has a proven extractable reserve of six billion tons of coal and holds immense potential to be one of the largest coal bed methane fields serving India’s growing energy ***,cleat length(L)correlates with corresponding maximum aperture width(Dmax)in a power-law function with an exponent of 0.84(DmaxαL0.84)instead of the commonly observed exponents of 1 or 0.5 applicable for other natural‘opening-mode’*** conventional wisdom pertains that laminar fluid flow(Q)through an isolated,smooth-walled,parallel-plate fracture,embedded in an impermeable matrix,is directly proportional to the cube of its aperture width(b,equivalent to Davg;cubic law:Qαb3).This assumes a linear relationship between length and fracture ***,the modified relationship between cleat length and average aperture width changes the cubic law applicable for Raniganj coal seam and now fluid flow correlates with aperture width in a power-law function with an exponent of 4.25(Qαb4.25)instead of 3(cube).Such simplifications will come handy for the modeling and estimation of fluid flow as it will reduce the effort of cleat length measurement which is anyway difficult and can be misleading due to the risk of undersampling.

关键词： CBM Cleat Coal Permeability Raniganj

Analog performance of double gate junctionless tunnel field effect transistor

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Journal of Semiconductors 2014年第7期35卷 37-41页

作者： M.W.Akram Bahniman ghosh Department of Electrical Engineering Indian Institute of Technology KanpurKanpurUttar Pradesh208016India Microelectronics Research Center 10100 Burnet RoadBldg.160University of Texas at AustinAustinTX78758USA

For the first time, we investigate the analog performance of n-type double gate junctionless tunnel field effect transistor （DG-JLTFET） and the results are compared with the conventional n-type double gate tunnel field effect transistor （DG-TFET） counterpart. Using extensive device simulations, the two devices are compared with the following analog performance parameters, namely transconductance, output conductance, output resistance, intrinsic gain, total gate capacitance and unity gain frequency. From the device simulation results, DG-JLTFET is found to have significantly better analog performance as compared to DG-TFET.

关键词： junctionless field effect transistor tunnel field effect transistor subthreshold slope

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Assessing land transformation and associated degradation of the Indian Ganga River Basin using forest cover land use mapping and residual trend analysis

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Journal of Arid Land 2019年第1期11卷 29-42页

作者： Shafique MATIN Sujit ghosh Mukunda D BEHERA Centre for Oceans Rivers Atmosphere and Land Sciences Indian Institute of Technology Kharagpur

The Indian Ganga River Basin（IGRB） has experienced continuous land transformation since the Indus Valley Civilisation shifted from the Indus basin to the Ganga basin. Particularly in the last few decades the land transformation has increased many-folds due to the changing climate and rapid increase in population. In this paper, we assessed land transformation and associated degradation in the IGRB based on the forest cover land use（FCLU） mapping and residual trend analysis（RTA）. The FCLU maps for 1975 and 2010 were generated using 216 Landsat satellite images and validated using 1509 ground points. We mapped 29 forest and 18 non-forest types and estimated a total loss of 5571 km2forest cover and expansion in settlement areas（5396 km2）. Other major changes mapped include a decrease in wetlands and water bodies, while an increase in agriculture and barren lands with an overall mapping accuracy of 85.3%（kappa, 0.82） and 88.43%（kappa, 0.84） for 1975 and 2010, respectively. We also performed the RTA analysis using GIMMS-NDVI3 g to identify areas of significant negative vegetative photosynthetic change as an indicator for land degradation. All the RTA models showed monotonic nature of the residual trends and resulted as moderately positive but highly significant（P<0.001）. Land degradation in the form of barren land accompanied by a decline in vegetation quality and coverage was found prominent in the basin with a possibility of an accelerated rate of land degradation in future due to the rapid loss of permanent forest cover.

关键词： land degradation remote sensing NDVI GIMMS Ganga River Basin

Parallel inverter control using different conventional control methods and an improved virtual oscillator control method in a standalone microgrid

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Protection and Control of Modern Power Systems 2022年第1期7卷 393-405页

作者： Vikash Gurugubelli Arnab ghosh Anup Kumar Panda Department of Electrical Engineering National Institute of Technology RourkelaRourkelaOdisha 769008India

Partly because of advances in power electronic converters,the share of renewable energy in power generation is steadily *** main medium of interface for integrating renewable energy sources to the utility grid is the power electronic *** oscillator control(VOC)is a time-domain approach for controlling parallel inverters in a standalone microgrid(MG).The concept is to simulate nonlinear deadzone oscillator dynamics in a system of invert-ers to ensure a stable AC MG in the absence of *** is a time-domain and self-synchronizing control-ler that simply requires the measurement of filter current,whereas traditional droop control and the virtual synchro-nous machine(VSM)require low pass filters for active and reactive power *** this work,a particle swarm optimization(PSO)-based VOC method(VOC-PSO)is proposed,in which the parameters of the VOC are designed using the PSO *** system performance using droop,VSM,VOC,and VOC-PSO controllers are investigated using MATLAB and Opal-RT real-time digital simulator *** results show that the proposed VOC-PSO gives improved performance over other control *** efficacy of the proposed VOC-PSO control method is also demonstrated by the experimental results.

关键词： VOC VSM Droop control Particle swarm optimization Parallel inverters Standalone microgrid

Behavior of fluxed lime iron oxide pellets in hot metal bath during melting and refining

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International Journal of Minerals,Metallurgy and Materials 2013年第4期20卷 329-337页

作者： J. Pal S. Ghorai M. C. Goswami D. ghosh D. Bandyopadhyay S. ghosh CSIR-National Metallurgical Laboratory Department of Metallurgical and Material Engineering Jadavpur University

Lump lime as a fiux material in a basic oxygen furnace （BOF） often creates problems in operation due to its high melting point, poor dissolution property, hygroscopic nature, and fines generation tendency. To alleviate these problems, fluxed lime iron oxide pellets （FLIP） containing 30% CaO were developed in this study using waste iron oxide fines and lime. The suitable handling strengths of the pellet （crushing strength： 300 N; drop strength： 130 times） of FLIP were developed by treating with CO2 or industrial waste gas at room temperature, while no separate binders were used. When the pellet was added into hot metal bath （carbon-containing molten iron）, it was decomposed, melted, and transformed to produce low melting oxidizing slag, because it is a combination of main CaO and Fe2O3. This slag is suitable for facilitating P and C removal in refining. Furthermore, the pellet enhances waste utilization and use of CO2 in waste gas. In this article, emphasis is given on studying the behavior of these pellets in hot metal bath during melting and refining along with thermodynamics and kinetics analysis. The observed behaviors of the pellet in hot metal bath confirm that it is suitable and beneficial for use in BOF and replaces lump lime.

关键词： ore pellets lime dissolution melting refining basic oxygen converters

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Augmentation of situational awareness by fault passage indicators in distribution network incorporating network reconfiguration

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Protection and Control of Modern Power Systems 2019年第1期4卷 281-294页

作者： Tanmay Jain Debomita ghosh Dusmanta Kumar Mohanta Department of Electrical and Electronics Engineering Birla Institute of TechnologyMesraRanchiIndia

Power distribution systems are profoundly inclined to disturbances like untimely switching of breakers & relays, sympathetic tripping, and uncertainties regarding fault location. Thus, system stability and reliability are greatly affected. In this way, situational awareness and system integrity are the crucial factors in developing power system security, as it empowers successful decision making & timely reaction by the operators to any disturbance and also maintaining continuity of power supply. This paper focuses on the enhancement of situational awareness by fault location through fault passage indicators (FPI) to improve nominal impedance-based methods in distribution networks. Also, the proposed method is validated by comparing it with Intelligent Electronic Device (IED) based fault location method. Further, simultaneous reconfiguration of the system is incorporated to maintain the continuity of supply. The analysis has been tested on IEEE 33 bus distribution system.

关键词： Situational awareness Fault passage Indicator Tie switching Reconfiguration

Search for periodicities of the solar irradiance data from the Earth Radiation Budget Satellite (ERBS) using the periodogram method

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Research in Astronomy and Astrophysics 2010年第4期10卷 348-354页

作者： Sankar Narayan Patra Gautam Bhattacharya Koushik ghosh Department of Applied Electronics and Instrumentation Engineering University Institute of Technologythe University of Burdwan Department of Physics University Institute of Technologythe University of Burdwan Department of Mathematics University Institute of Technologythe University of Burdwan

We have analyzed the solar irradiance data from the Earth Radiation Budget Satellite （ERBS） during the time period from 1984 October 15 to 2003 October *** first filtering the data by Simple Exponential Smoothing,we have applied the periodogram method to the processed data in order to search for its time *** study exhibits multi-periodicities on these data around 110,118,574 and 740d with very high confidence levels （more than 99%）.These periods are significantly similar to the periods of other solar activities which may suggest that solar irradiance may be associated with other solar activities.

关键词： Sun:activity - Sun:fundamental parameters

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Linear and nonlinear elastic analysis of closely spaced strip foundations using Pasternak model

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Frontiers of Structural and Civil Engineering 2017年第2期11卷 228-243页

作者： Priyanka ghosh S. RAJESH J. SAI CHAND Department of Civil Engineering Indian Institute of Technology Kanpur Kanpur 208016 India

In this study, an attempt is made to determine the interaction effect of two closely spaced strip footings using Pasternak model. The study considers small strain problem and has been performed using linear as well as nonlinear elastic analysis to determine the interaction effect of two nearby strip footings. The hyperbolic stress-strain relationship has been considered for the nonlinear elastic analysis. The linear elastic analysis has been carried out by deriving the equations for the interference effect of the footings in the framework of Pasternak model equation; whereas, the nonlinear elastic analysis has been performed using the finite difference method to solve the second order nonlinear differential equation evolved from Pasternak model with proper boundary conditions. Results obtained from the linear and the nonlinear elastic analysis are presented in terms of non-dimensional interaction factors by varying different parameters like width of the foundation, load on the foundation and the depth of the rigid base. Results are suitably compared with the existing values in the literature.

关键词： bearing capacity linear and non-linear elasticity foundation interaction effect numerical modeling Pastemak model