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Journal of Modern Power Systems and Clean Energy 2019年第5期7卷 1241-1255页

作者： sujit kumar dash Pradipta Kishore dash Siksha O Anusandhan Deemed to be University Bhubaneswar 751030India

A new hybrid adaptive autoregressive moving average(ARMA)and functional link neural network(FLNN)trained by adaptive cubature Kalman filter(ACKF)is presented in this paper for forecasting day-ahead mixed short-term demand and electricity prices in smart *** hybrid forecasting framework is intended to capture the dynamic interaction between the electricity consumers and the forecasted prices resulting in the shift of demand curve in electricity *** proposed model comprises a linear ARMA-FLNN obtained by using a nonlinear expansion of the weighted *** nonlinear functional block helps introduce nonlinearity by expanding the input space to higher dimensional space through basis *** train the ARMA-FLNN,an ACKF is used to obtain faster convergence and higher forecasting *** proposed method is tested on several electricity markets,and the performance metrics such as the mean average percentage error(MAPE)and error variance are compared with other forecasting methods,indicating the improved accuracy of the approach and its suitability for a real-time forecasting.

关键词： Mixed demand and price forecasting Cubature Kalman filter Price spikes Smart grids

Stabilization of expansive soils using chemical additives: A review

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Journal of Rock Mechanics and Geotechnical Engineering 2022年第4期14卷 1319-1342页

作者： Dharmendra Barman sujit kumar dash Department of Civil Engineering Indian Institute of Technology KharagpurKharagpur721302India

Volume instability of expansive soils due to moisture fluctuations is often disastrous,causing severe damages and distortions in the supported *** is,therefore,necessary to adequately improve the performance of such soils that they can favorably fulfil the post-construction stability *** can be achieved through chemical stabilization using additives such as lime,cement and fly *** this paper,suitability of such additives under various conditions and their mechanisms are reviewed in *** is observed that the stabilization process primarily involves hydration,cation exchange,flocculation and pozzolanic *** degree of stabilization is controlled by several factors such as additive type,additive content,soil type,soil mineralogy,curing period,curing temperature,delay in compaction,pH of soil matrix,and molding water content,including presence of nano-silica,organic matter and sulfate *** of nano-silica not only improves soil packing but also accelerates the pozzolanic ***,presence of deleterious compounds such as sulfate or organic matter can turn the treated soils unfavorable at times even worser than the unstabilized ones.

关键词： Expansive soil Cement Lime Fly ash Pozzolanic reactions Sulfate attack

Wind environment around the setback building models

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Building Simulation 2021年第5期14卷 1525-1541页

作者： Amlan kumar Bairagi sujit kumar Dalui Department of Civil Engineering Indian Institute of Engineering Science and TechnologyShibpurHowrahIndia

The irregular shape of buildings always tenders an enormous challenge to the *** wind velocity at the pedestrian level has a specific approach from a comfortable point of *** investigation highlighted the characteristic of the pedestrian level wind velocity for distinct types of asymmetrical setback *** passed study explored the pedestrian level effect for the axisymmetric models,while this study is based on the models that have symmetry about a single *** study investigates the pedestrian level flow fluctuation of setback models with single and double side setbacks at multiple *** double-side double setback buildings are efficient to reduce 28%-30%velocity in front of the building and 68%-70%velocity behind the *** it suggests that the double side double setback building is efficient to maintain the velocity at the pedestrian level,roof level,and backside of the *** setback building can easily control the frequency of fluctuating velocity at downstream flow for both along and across wind conditions.

关键词： amplification factor pedestrian level flow setback model velocity spectra wind environment computational fluid dynamics(CFD)

Effects of side ratio for ‘Y’ plan shaped tall building under wind load

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Building Simulation 2021年第4期14卷 1221-1236页

作者： Prasenjit Sanyal sujit kumar Dalui Department of Civil Engineering Meghnad Saha Institute of TechnologyKolkataIndia Department of Civil Engineering IIESTShibpurHowrahIndia

Wind load and response are the major factors that govern the most critical condition for designing tall buildings. This study discusses the variability of wind load and pressure on a Y plan shaped tall building due to the change in the building side ratio. The length to width ratio is changed keeping the total plan area same. The numerical study is done by ANSYS CFX. Two turbulence models, k-epsilon and shear stress transport (SST), are used for doing the numerical simulation and the results are compared with the previous wind tunnel results in a similar flow condition. Sample points were selected based on Audze–Eglais Uniform Latin Hypercube (AELH) method and the analytical expressions of force, moment and torsional coefficients of Y plan shaped tall building are proposed. These expressions are fitted very well and the AELH method has given a great set of sample points that have significantly decreased the total computational time. The graphical representations of these expressions for various coefficients are presented and discussed. Then pressure distributions on three different models are compared and the pros and cons of higher and lower values of side ratios are discussed.

关键词： computational fluid dynamics AELH sampling method least square polynomial side ratio force coefficient moment coefficient

Interaction behavior and load sharing pattern of piled raft using nonlinear regression and LM algorithm-based artificial neural network

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Frontiers of Structural and Civil Engineering 2021年第5期15卷 1181-1198页

作者： Plaban DEB sujit kumar PAL Department of Civil Engineering G H Raisoni College of Engineering&ManagementPune 412207India Department of Civil Engineering National Institute of TechnologyAgartala 799046India

In the recent era,piled raft foundation(PRF)has been considered an emergent technology for offshore and onshore *** previous studies,there is a lack of illustration regarding the load sharing and interaction behavior which are considered the main intents in the present *** element(FE)models are prepared with various design variables in a double-layer soil system,and the load sharing and interaction factors of piled rafts are *** obtained results are then checked statistically with nonlinear multiple regression(NMR)and artificial neural network(ANN)modeling,and some prediction models are *** models are prepared with Levenberg-Marquardt(LM)algorithm for load sharing and interaction factors through backpropagation *** factor of safety(FS)of PRF is also estimated using the proposed NMR and ANN models,which can be used for developing the design strategy of PRF.

关键词： interaction load sharing ratio piled raft nonlinear regression artificial neural network

A Compact Quad-Band Sickle-Shaped Monopole Antenna for GSM 900/WiMax/WLAN Applications

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Computers, Materials & Continua 2022年第10期73卷 397-410页

作者： sujit Goswami sujit kumar Mandal Soumen Banerjee Department of Electronics and Communication Engineering National Institute of TechnologyDurgapur713213West BengalIndia Department of Electronics and Communication Engineering University of Engineering and ManagementNew TownKolkata700156West BengalIndia

In this paper a novel,compact,microstrip-fed,quad-band monopole antenna is presented for the application of Global System for Mobile communication(GSM 900),Worldwide Interoperability for Microwave Access(WiMAX)and Wireless Local Area Network(WLAN).The proposed antenna comprises of a sickle-shaped structure with four circular arc strips,and a modified rectangular ground *** four strips of the antenna are independently responsible for the four different resonant frequencies of the operating bands and can be tuned separately to control the radiation *** proposed quad-band antenna is designed to resonate at 940 MHz for GSM 900,2.5 and 3.5 GHz for WiMAX and 5.85 GHz for WLAN *** the four intended operating bands,the antenna exhibits impedance bandwidth of 60 MHz(905–965MHz),80 MHz(2.45–2.53 GHz),110 MHz(3.48–3.59 GHz)and 2.39 GHz(4.82–7.21 GHz),*** the resonance frequency of the four bands,the gain of the proposed antenna is obtained as 4.2,2.5,1.7 and 1.9 dBi,respectively.A prototype of the designed antenna is fabricated and a good agreement between simulated and measured results is ***,the proposed antenna shows good radiation characteristics and gains at all the four operating bands.

关键词： Antenna gain GSM 900 IEEE 802.11a monopole strips quad-band sickle-shaped WiMAX WLAN

Performance assessment of aged binder rejuvenated with Polanga oil

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Journal of Traffic and Transportation Engineering(English Edition) 2019年第6期6卷 608-620页

作者： sujit kumar Pradhan Umesh Chandra Sahoo School of Infrastructure Indian Institute of Technology BhubaneswarOdisha 752050India

Presently,there is a necessity of increasing the reclaimed asphalt pavement(RAP)content in recycling of asphalt pavements to save material cost,preserve energy and protect the environment and efforts are being made to utilize 100%RAP in the *** binder is usually stiff due to oxidation and loss of *** addition of high amount of RAP to the asphalt mix,may make it prone to fatigue *** to this reason,rejuvenators are added to restore some of the physical and chemical properties for desired performance of the *** this study,a locally available non-edible oil known as Polanga oil(biological name:Calophyllum inophyllum)has been explored as rejuvenator to study its effect on performance of the aged *** binder prepared in the laboratory using the Pressure Aging Vessel(PAV)and binder extracted from the RAP collected from a nearby source were used in this study for *** binder and RAP binder mixed with the rejuvenator at varying *** rheological characterizations in terms of flow,rutting,fatigue and creep recovery of rejuvenated PAV aged&RAP binders were carried out using a dynamic shear rheometer(DSR)to determine the optimum dosage of the *** was observed that,5 percent of Polanga oil is able to divulge the desirable rheological properties of the rejuvenated binder.

关键词： Virgin bitumen Reclaimed asphalt pavement Rejuvenator Polanga oil Aged bitumen Rheology

Two-layer supply chain model for Cauchy-type stochastic demand under fuzzy environment

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International Journal of Intelligent Computing and Cybernetics 2018年第2期11卷 285-308页

作者： sujit kumar De Shib Sankar Sana Department of Mathematics Midnapore CollegeMidnaporeIndia Department of Mathematics Bhangar MahavidyalayaKolkataIndia

Purpose–The purpose of this paper is to deal with profit maximization problem of two-layer supply chain(SC)under fuzzy stochastic demand having finite mean and unknown *** policy is employed from the retailer to *** profit of the supplier solely depends on the order size of the ***,the loss of shortage items is related to loss of profit and goodwill *** authors develop the profit function separately for both the retailer and supplier,first,for a decentralized system and,second,joining them,the authors get a centralized system(CS)of decision making,in which one is giving more profit to both of *** problem is solved analytically first,then the authors fuzzify the model and solve by fuzzy Hausdorff distance ***/methodology/approach–The analytical models are formed for both centralized and decentralized systems under non-cooperative and cooperative environment with suitable constraints.A significant assumption on density function,namely Cauchy-type density function,is introduced for demand rate because of its wider range of the retailers’*** Hausdorff metric is incorporated within the fuzzy components of the fuzzy sets *** this method,the authors find out closure values of both centralized and decentralized policies,which is an essential part of any cooperative and non-cooperative two-layer SC ***,the authors take care of the profit values with corresponding ambiguities for both the systems ***–It is found that the centralize policy of SC could only be able to maximize the profit of both the retailers and *** analytical results are illustrated numerically along with sensitivity analysis and side by side comparative studies between Hausdorff and Euclidean distance measure are done *** limitations/implications–The main focus of attention of the proposed model is given to usefulness of Hausdorff *** other distances,Hausdor

关键词： Supply chain Fuzziness Optimization

Synthesis and characterization of ZnO-Al_2O_3 oxides as energetic electro-catalytic material for glucose fuel cell

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燃料化学学报 2015年第8期43卷 1004-1010页

作者： sujit kumar Guchhait Subir Paul Metallurgical and Material Engineering Department Jadavpur University

One of the thrust areas of research is to find an alternative fuel to meet the increasing demand for *** is a good source of alternative fuel for clean energy and is easily available in abundance from both naturally occurring plants and industrial *** oxidation of glucose in fuel cell requires high electro-catalytic surface of the electrode to produce the clean electrical energy w ith minimum energy losses in the *** and Pt based alloys exhibit high electro-catalytic properties but they are *** energy synthesis at economically cheap price,non Pt based inexpensive high electro catalytic material is *** synthesized Zn O-Al2O3composite is found to exhibit high electro-catalytic properties for glucose *** Cyclic Voltammetry and Chronoamperometry curves reflect that the material is very much comparable to Pt as far as the maximum current and the steady state current delivered from the glucose oxidation are *** image confirms the mixed oxide *** images morphology show increased 3D surface areas at higher *** attributed high current delivered from electrochemical oxidation of glucose on this electrode surface.

关键词： glucose energy materials electro-catalyst cyclic voltammetry chronoamperometry polarization

Effect of osteoarthritic knee flexion deformity correction by total knee arthroplasty on sagittal spinopelvic alignment in Indian population

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World Journal of Clinical Cases 2022年第21期10卷 7348-7355页

作者： Lubaib Karaniveed Puthiyapura Mantu Jain sujit kumar Tripathy Haridas Mundot Puliappadamb Department of Orthopaedics AIIMS BhubaneswarBhubaneswar 751019OdishaIndia Department of Pharmacology AIIMS BhubaneswarBhubaneswar 751019OdishaIndia

BACKGROUND Sagittal alignment of the spine,pelvis,and lower extremities is essential for maintaining a stable and efficient posture and *** in any element can result in compensatory changes in the other *** flexion is a compensatory mechanism for spinopelvic sagittal alignment and is markedly affected in severe knee osteoarthritis(OA).The correction of knee flexion deformity(KFD)by total knee arthroplasty(TKA)can lead to complementary changes in the sagittal spinopelvic parameters(SSPs).AIM To determine the SSP changes in patients with knee OA,with or without KFD undergoing *** The study was conducted in 32 patients who underwent TKA.A neutral standing whole-spine lateral radiograph was performed before surgery and 3 mo after surgery in these *** were divided into two groups(Group 1 obtained>10°corrections in KFD;group B obtained10°)in KFD.

关键词： Knee osteoarthritis Total knee replacement Spino-sagittal parameters Knee flexion deformity