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EMD-Att-LSTM: A Data-driven Strategy Combined with Deep Learning for Short-term Load Forecasting

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Journal of Modern Power Systems and Clean Energy 2022年第5期10卷 1229-1240页

作者： Neeraj Jimson Mathew ranjan Kumar Behera Indian Instituteof Technology Patna801103India

Electric load forecasting is an efficient tool for system planning, and consequently, building sustainable power systems. However, achieving desirable performance is difficult owing to the irregular, nonstationary, nonlinear, and noisy nature of the observed data. Therefore, a new attention-based encoderdecoder model is proposed, called empirical mode decomposition-attention-long short-term memory(EMD-Att-LSTM).EMD is a data-driven technique used for the decomposition of complex series into subsequent simpler series. It explores the inherent properties of data to obtain the components such as trend and seasonality. Neural network architecture driven by deep learning uses the idea of a fine-grained attention mechanism, that is, considering the hidden state instead of the hidden state vectors, which can help reflect the significance and contributions of each hidden state dimension. In addition, it is useful for locating and concentrating the relevant temporary data,leading to a distinctly interpretable network. To evaluate the proposed model, we use the repository dataset of Australian energy market operator(AEMO). The proposed architecture provides superior empirical results compared with other advanced models. It is explored using the indices of root mean square error(RMSE) and mean absolute percentage error(MAPE).

关键词： Short-term load forecasting Australian energy market operator long short-term memory(LSTM) empirical mode decomposition(EMD) attention mechanism

Perovskite solar cells: recent progress and strategies developed for minimizing interfacial recombination

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Frontiers of Materials Science 2022年第2期16卷 41-54页

作者： Rengasamy DHANABAL Suhash ranjan DEY Combinatorial Materials Laboratory Department of Materials Science and Metallurgical EngineeringIndian Institute of Technology HyderabadKandiSangareddy 502284TelanganaIndia

Organometallic perovskite is a new generation photovoltaic material with exemplary properties such as high absorption co-efficient,optimal bandgap,high defect tolerance factor and long carrier diffusion ***,suitable electrodes and charge transport materials are required to fulfill photovoltaic processes where interfaces between hole transport material/perovskite and perovskite/electron transport material are affected by phenomena of charge carrier separation,transportation,collection by the interfaces and band *** on recent available literature and several strategies for minimizing the recombination of charge carriers at the interfaces,this review addresses the properties of hole transport materials,relevant working mechanisms,and the interface engineering of perovskite solar cell(PSC)device architecture,which also provides significant insights to design and development of PSC devices with high efficiency.

关键词： light absorption p–i–n and n–i–p structure interface recombination build-in potential perovskite solar cell

Nonlinear thermomechanical deformation behaviour of P-FGM shallow spherical shell panel

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Chinese Journal of Aeronautics 2016年第1期29卷 173-183页

作者： Vishesh ranjan Kar Subrata Kumar Panda Department of Mechanical Engineering National Institute of Technology

In the present article, the linear and the nonlinear deformation behaviour of functionally graded （FG） spherical shell panel are examined under thermomechanical load. The temperature- dependent effective material properties of FG shell panel are evaluated using Voigt＇s micro-mechanical rule in conjunction with power-law distribution. The nonlinear mathematical model of the FG shell panel is developed based on higher-order shear deformation theory and Green-Lagrange type geometrical nonlinearity. The desired nonlinear governing equation of the FG shell panel is computed using the variational principle. The model is discretised through suitable nonlinear finite element steps and solved using direct iterative method. The convergence and the val- idation behaviour of the present numerical model are performed to show the efficacy of the model. The effect of different parameters on the nonlinear deformation behaviour of FG spherical shell panel is highlighted by solving numerous examples.

关键词： Functionally graded mate-rial Green-Lagrange Higher-order Nonlinear deformation Temperature-dependent

Liquid-liquid extraction of phosphorus from sulfuric acid solution using benzyl dimethyl amine

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International Journal of Minerals,Metallurgy and Materials 2021年第3期28卷 367-372页

作者： Sadia Ilyas Rajiv ranjan Srivastava Hyunjung Kim Department of Mineral Resources and Energy Engineering Jeonbuk National UniversityJeonjuJeonbuk 54896Republic of Korea Center for Advanced Chemistry Institute of Research and DevelopmentDuy Tan UniversityDa Nang 550000Vietnam Faculty of Natural Sciences Duy Tan UniversityDa Nang 550000Vietnam

This study addresses the liquid-liquid extraction behavior of phosphorus from a sulfuric acid solution using benzyl dimethyl amine(BDMA)in *** extraction equilibria investigated with varied BDMA concentrations could reveal the formation of 3[BDMA]·[H_(3)PO_(4)]^(-)complex in the organic *** thermodynamic properties determined at various temperatures indicated that the process was exothermic with a calculated enthalpy(△H^(Θ))of−24.0 kJ·mol^(−1).The organic-to-aqueous phase(O/A)volume ratio was varied to elucidate the quantitative extraction of *** McCabe-Thiele diagram plotted for the extraction isotherm was validated for the requirement of three counter-current stages in the extraction at an O/A volume ratio of 2.0/*** back-extraction of phosphorus from the loaded organic phase was quantitatively achieved by contacting 4.0 mol·L−1 H2SO4 solution in three stages of counter-current contact at an O/A volume ratio of 3/*** study can be applied to remove phosphorus from the sulfuric acid leach solutions of monazite processing,and many other solutions.

关键词： solvent extraction phosphorus benzyl dimethyl amine(BDMA) sulfuric acid solution McCabe-Thiele diagram

Graphene-induced Pd nanodendrites： A high performance hybrid nanoelectrocatalyst

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Nano Research 2013年第9期6卷 635-643页

作者： Subash Chandra Sahu Aneeya K. Samantarat Ajit dash R. R. Juluri ranjan K. Sahu B. K. Mishra Bikash Kumar Jena (1~3) Colloids & Materials Chemistry CSIR-Institute of Minerals and Materials Technology Bhubaneswar-7S I013 India Institute of Physics Bhubaneswar-751005 India Materials Science and Technology Division National Metallurgical Laboratory Jamshedpur-831007 India

A facile and green approach has been developed for the in situ synthesis of hybrid nanomaterials based on dendrite-shaped Pd nanostructures supported on graphene （RG）. The as-synthesized hybrid nanomaterials （RG-PdnDs） have been thoroughly characterized by high resolution transmission electron microscopy, X-ray photoelectron spectroscop）~ atomic force microscop）~ Raman spectroscopy and electrochemical techniques. The mechanism of formation of such dendrite- shaped Pd nanostructures on the graphene support has been elucidated using transmission electron microscopy （TEM） measurements. The RG induces the formation of, and plays a decisive role in shaping, the dendrite morphology of Pd nanostructures on its surface. Cyclic voltammetry and chronoamperometry techniques have been employed to evaluate the electrochemical performance of RG-PdnDs towards oxidation of methanol. The electrochemical （EC） activities of RG-PdnDs are compared with graphene-supported spherical-shaped Pd nanostructures, Pd nanodendrites alone and a commercial available Pd/C counterpart. The combined effect of the graphene support and the dendrite morphology of RG-PdnDs triggers the high electrocatalytic activity and results in robust tolerance to CO poisoning.

关键词： nanodendrites reduced graphene methanol oxidation surface poisoning

Design analysis for ultra-low crosstalk in high core count heterogeneous multicore fiber

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Optoelectronics Letters 2021年第10期17卷 616-621页

作者： Dablu Kumar Rakesh ranjan OFC and Photonics Lab Department of Electronics and Communication EngineeringNational Institute of Technology PatnaPatna 800005India

Design analysis of high core count(36-core,37-core)un-coupled multicore fiber(MCF)using the heterogeneous core has been proposed,to achieve the high spatial efficiency and ultra-low crosstalk(~-81 d B/100 km)under the limited cladding diameter of 300μ*** realize the ultra-low crosstalk level between the neighboring cores,the combination of two crosstalk reduction approaches,trench-assisted(TA)core and propagation direction interleaving(PDI)technique has been *** forward and backward crosstalk characterizations have been studied in heterogeneous MCF with respect to fiber bending radius,wavelength,transmission distance,and core-pitch with both normal step-index and trench-assisted cores under single-mode propagation condition.

关键词： crosstalk fiber trench

Design of a Robust Optimal Decentralized PI Controller Based on Nonlinear Constraint Optimization For Level Regulation: An Experimental Study

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IEEE/CAA Journal of Automatica Sinica 2020年第1期7卷 187-199页

作者： Soumya ranjan Mahapatro Bidyadhar Subudhi Sandip Ghosh Department of Electrical Engineering National Institute of Technology RourkelaRourkela 769008India School of Electrical Sciences Indian Institute of TechnologyFarmagudiGoa 403401India Department of Electrical Engineering Indian Institute of TechnologyVaranasi 221005India

This paper presents the development of a new robust optimal decentralized PI controller based on nonlinear optimization for liquid level control in a coupled tank system. The proposed controller maximizes the closed-loop bandwidth for specified gain and phase margins, with constraints on the overshoot ratio to achieve both closed-loop performance and robustness. In the proposed work, a frequency response fitting model reduction technique is initially employed to obtain a first order plus dead time(FOPDT) model of each higher order subsystem. Furthermore, based on the reduced order model, a proposed controller is designed. The stability and performance of the proposed controller are verified by considering multiplicative input and output uncertainties. The performance of the proposed optimal robust decentralized control scheme has been compared with that of a decentralized PI controller. The proposed controller is implemented in real-time on a coupled tank system. From the obtained results,it is shown that the proposed optimal decentralized PI controller exhibits superior control performance to maintain the desired level, for both the nominal as well as the perturbed case as compared to a decentralized PI controller.

关键词： Decentralized control multivariable system process control parameter uncertainty robustness

An efficient and comparative adsorption of Congo red and Trypan blue dyes on MgO nanoparticles: Kinetics, thermodynamics and isotherm studies

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Journal of Magnesium and Alloys 2021年第2期9卷 478-488页

作者： Barsharani Priyadarshini Tanaswini Patra Tapas ranjan Sahoo Department of Chemistry School of Applied SciencesKIIT deemed to be UniversityBhubaneswar 24OdishaIndia

Cubic phase of Mg O nanoparticles were prepared by microwave-assisted combustion synthesis and investigated for the removal of toxic dyes like Congo Red(CR)and Trypan blue(TB).The crystallite size of the Mg O nanoparticle was calculated to be 18 nm from XRD *** sample was further characterized by FTIR,TGA and FESEM *** dyes were subjected to prototypical batch adsorption process,including investigation of different parameters like Mg O dosage,dye concentration,solution pH,agitation speed and *** was found that,0.2 g of Mg O NPs showed maximum removal efficiency for both the dyes(more than 98%),having 25 ppm of dye concentration at an acidic p H(3–4).The maximum loading capacity of Mg O NPs was obtained to be 136 mg/g and 132 mg/g for CR and TB,*** thermodynamic parameters like△G^(0),△H^(0)and△S^(0)were *** negative△H^(0)and the positive△S^(0)values for both the dyes correspond to an exothermic process and an increase in randomness of the adsorbent and *** isotherm analysis exhibited that the Freundlich model fits better to the experimental equilibrium data,suggesting heterogeneous surface of the ***,the kinetic data revealed a pseudo 2 nd order rate for adsorption process.

关键词： Adsorption Congo red Trypan blue MgO NPs Kinetics Isotherm

Multi-phase computer modeling and laboratory study of dust capture by an inertial Vortecone scrubber

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International Journal of Mining Science and Technology 2020年第3期30卷 287-291页

作者： Ashish ranjan Kumar Steven Schafrik Thomas Novak Department of Mining Engineering University of Kentucky504 Rose Street230 Mining and Mineral Resources BuildingLexingtonKY 40506United States

Dust generated in mining and tunneling activities is hazardous to health of persons and safety of operations. These projects employ pick-milling machines to extract minerals and rock by mechanical *** machines are equipped with flooded-bed scrubbers that encase dust particles within fine water films as particles encounter a flooded wire-mesh screen. A major disadvantage is that the screen gets clogged when particles become trapped within the wire mesh, reducing airflow through the scrubber and increasing ambient dust concentrations. Thus, the system requires frequent maintenance or replacement. The application of a Vortecone scrubber as an improved alternative to conventional fibrous type scrubbers is investigated. A Vortecone forces dust-laden air and water to follow a complex, rapidly swirling *** momentum drives dust particles towards the periphery where they are captured by the water *** operating characteristics of a reduced-scale physical model of a Vortecone, with its primary axis mounted in the horizontal orientation, was analyzed numerically and experimentally. Computational fluid dynamics(CFD) models depicting the spraying action and multi-phase air/water flows using the volume of fraction(VOF) approach, are presented. Experimental results, utilizing an optical particle counting technique to establish the dust-cleaning capabilities of the model, are also described.

关键词： Computational fluid dynamics(CFD) Process safety Multi-phase flows Volume of fraction(VOF) Dust-capture Cleaning efficiency