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A Standalone BLDC Based Solar Air Cooler with MPP Tracking for Improved Efficiency

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CSEE Journal of Power and Energy Systems 2019年第1期5卷 111-119页

作者： Sreedhar Madichetty deepak Pullaguram Sukumar Mishra Indian Institute of Technology DelhiNew DelhiIndia

This article proposes the idea of using Solar Energy(SE)as a source of power for designing and developing a standalone air-cooling *** type of application is particularly suited for rural areas that have a considerable amount of solar radiation and have no access to grid *** proposed system is comprised of a photovoltaic(PV)array,DC-DC boost converter and DC-DC buck *** Permanent Magnet Brushless Direct Current(PMBLDC)motors are employed to drive a centrifugal water pump and an air blower coupled to their individual *** air blower is connected with a DCDC boost converter that ensures a maximum power point(MPP)operation.A centrifugal water pump is connected with a DC-DC buck *** challenging task in an air cooling system is to maintain the constant speed of the blower under variable irradiance *** power provided by the solar PV array can be shared between the two DC-DC converters in such a way that the BLDC motor connected with the blower will maintain a constant speed by maintaining the constant voltage of the DCDC boost *** rest of the available PV power will be handled by the *** suitability of the proposed system for various perturbations is evaluated by simulating the proposed system using a MATLAB/Simulink and is validated by conducting *** studies have been performed with a variable PV irradiance and the results are explored.

关键词： BLDC air blower BLDC motor BLDC Pump PV System

Numerical analysis and geotechnical assessment of mine scale model

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International Journal of Mining Science and Technology 2012年第5期22卷 693-698页

作者： Khanal Manoj Adhikary deepak Balusu Rao Earth Science and Resource Engineering Commonwealth Scientific and Industrial Research OrganizationQueensland Center for Advanced TechnologyTechnology CourtPullenvale QLD 4069Australia

Various numerical methods are available to model,simulate,analyse and interpret the results;however a major task is to select a reliable and intended tool to perform a realistic assessment of any *** a model to be a representative of the realistic mining scenario,a verified tool must be chosen to perform an assessment of mine roof support requirement and address the geotechnical risks associated with longwall *** dependable tools provide a safe working environment,increased production,efficient management of resources and reduce environmental impacts of *** various methods,for example,analytical,experimental and empirical are being adopted in mining,in recent days numerical tools are becoming popular due to the advancement in computer hardware and numerical *** rules based on past experiences do provide a general guide,however due to the heterogeneous nature of mine geology(i.e.,none of the mine sites are identical),numerical simulations of mine site specific conditions would lend better insights into some underlying *** paper highlights the use of a continuum mechanics based tool in coal mining with a mine scale *** continuum modelling can provide close to accurate stress fields and *** paper describes the use of existing mine data to calibrate and validate the model parameters,which then are used to assess geotechnical issues related with installing a new high capacity longwall mine at the mine site.A variety of parameters,for example,chock convergences,caveability of overlying sandstones,abutment and vertical stresses have been estimated.

关键词： Mining Coal Chock Abutment

Evaluation of mine scale longwall top coal caving parameters using continuum analysis

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Mining Science and Technology 2011年第6期21卷 787-796页

作者： Manoj Khanal deepak Adhikary Rao Balusu Earth Science and Resource Engineering Commonwealth Scientific and Industrial Research OrganizationQueensl and Center for Advanced Technology1Technology CourtPullenvaleQLD4069Australia

A mine-scale analysis of Longwall Top Coal Caving (LTCC) is performed using a continuum mechanics finite element solver called COSFLOW. The uniqueness of COSFLOW is that it incorporates Cosserat continuum theory in its formulation for describing the load deformation of bedded rocks. It is shown that such a continuum based code is valuable for assessing the feasibility of introducing LTCC in any mine. Various LTCC parameters, for example chock convergences, top coal failure behavior, strata cavingmechanism, abutment stresses and vertical stresses, were evaluated for a mine using COSFLOW.

关键词： LTCC COSFLOW Cosserat FEM Modeling Simulation

A two-stage metaheuristic algorithm for the dynamic vehicle routing problem in Industry 4.0 approach

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Journal of Management Analytics 2021年第1期8卷 69-83页

作者： Maryam Abdirad Krishna Krishnan deepak Gupta Department of Industrial Systemsand Manufacturing EngineeringWichita State UniversityWichitaKSUSA

Industry 4.0 is a concept that assists companies in developing a modern supply chain(MSC)system when they are faced with a dynamic *** Industry 4.0 focuses on mobility and real-time integration,it is a good framework for a dynamic vehicle routing problem(DVRP).This research works on *** aim of this research is to minimize transportation cost without exceeding the capacity constraint of each vehicle while serving customer demands from a common ***,new orders arrive at a specific time into the system while the vehicles are executing the delivery of existing *** paper presents a two-stage hybrid algorithm for solving the *** the first stage,construction algorithms are applied to develop the initial *** the second stage,improvement algorithms are *** results were designed for different sizes of *** results show the effectiveness of the proposed algorithm.

关键词： dynamic vehicle routing problem Industry 4.0 two-stage algorithm heuristic algorithms

A Comprehensive Survey on Federated Learning in the Healthcare Area: Concept and Applications

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Computer Modeling in Engineering & Sciences 2024年第9期140卷 2239-2274页

作者： deepak Upreti Eunmok Yang Hyunil Kim Changho Seo Department of Convergence Science Kongju National UniversityChungcheongnam-doGongju-si32588South Korea Department of Information Security Cryptologyand MathematicsKookmin UniversitySeoul02707South Korea Department of Information and Communication Engineering Chosun UniversityGwangju61452South Korea Basic Science Research Institution Kongju National UniversityChungcheongnam-doGongju-si32588South Korea

Federated learning is an innovative machine learning technique that deals with centralized data storage issues while maintaining privacy and *** involves constructing machine learning models using datasets spread across several data centers,including medical facilities,clinical research facilities,Internet of Things devices,and even mobile *** main goal of federated learning is to improve robust models that benefit from the collective knowledge of these disparate datasets without centralizing sensitive information,reducing the risk of data loss,privacy breaches,or data *** application of federated learning in the healthcare industry holds significant promise due to the wealth of data generated from various sources,such as patient records,medical imaging,wearable devices,and clinical research *** research conducts a systematic evaluation and highlights essential issues for the selection and implementation of federated learning approaches in *** evaluates the effectiveness of federated learning strategies in the field of *** offers a systematic analysis of federated learning in the healthcare domain,encompassing the evaluation metrics *** addition,this study highlights the increasing interest in federated learning applications in healthcare among scholars and provides foundations for further studies.

关键词： Federated learning artificial intelligence machine learning privacy healthcare

Numerical Modeling of Porous Flow in Fractured Rock and Its Applications in Geothermal Energy Extraction

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Journal of Earth Science 2015年第1期26卷 20-27页

作者： Yucang Wang Shimin Wang Sheng Xue deepak Adhikary Earth Science and Resource Engineering CSIROKenmore Qld 4069BrisbaneAustralia Key Laboratory of Computational Geodynamics University of Chinese Academy of Sciences

Understanding the characteristics of hydraulic fracture, porous flow and heat transfer in fractured rock is critical for geothermal power generation applications, and numerical simulation can provide a powerful approach for systematically and thoroughly investigating these problems. In this paper, we present a fully coupled solid-fluid code using discrete element method （DEM） and lattice Boltzmann method （LBM）. The DEM with bonded particles is used to model the deformation and fracture in solid, while the LBM is used to model the fluid flow. The two methods are two-way coupled, i.e., the solid part provides a moving boundary condition and transfers momentum to fluid, while the fluid exerts a dragging force to the solid. Two widely used open source codes, the ESyS Particle and the OpenLB, are integrated into one code and paralleled with Message Passing Interface （MPI） library. Some preliminary 2D simulations, including particles moving in a fluid and hydraulic fracturing induced by injection of fluid into a borehole, are carried out to validate the integrated code. The preliminary results indicate that the new code is capable of reproducing the basic features of hydraulic fracture and thus offers a promising tool for multiscale simulation of porous flow and heat transfer in fractured rock.

关键词： discrete element method lattice Boltzmann method hydraulic fracturing geothermalenergy extraction multiscale modelling.

Estimation of de-trapped charge for diagnosis of transformer insulation using short-duration polarisation current employing detrended fluctuation analysis

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High Voltage 2020年第5期5卷 636-641页

作者： Saurabh Dutta deepak Mishra Arijit Baral Sivaji Chakravorti Department of Electrical Engineering Indian Institute of Technology(ISM)DhanbadIndia Department of Electrical Engineering Jadavpur UniversityKolkataIndia

Researchers have shown that the value of charge carriers,de-trapped from the oil-paper interface of power transformer insulation,is useful in carrying out the ***,the evaluation of the de-trapped charge requires the analysis of polarisation-depolarisation *** an off-line time-consuming process,the measurement and analysis of polarisation and depolarisation current(PDC)data are not practically *** study presents a detrended fluctuation analysis-based technique to estimate the magnitude of normalised de-trapped charge using the polarisation current measured for a short *** the proposed technique,the requirement of measuring the complete PDC data,for diagnosis purposes,can be ***,the technique also eliminates the requirement of depolarisation current which in turn facilitates a reduction in equipment shutdown *** applicability of the proposed technique is tested on the data obtained from several real-life power transformers.

关键词： charge insulation diagnosis

Novel Lyapunov-based rapid and ripple-free MPPT using a robust model reference adaptive controller for solar PV system

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Protection and Control of Modern Power Systems 2023年第1期8卷 205-229页

作者： Saibal Manna Ashok Kumar Akella deepak Kumar Singh Department of Electrical Engineering National Institute of Technology JamshedpurJharkhand 831014India

The technological,economic,and environmental benefits of photovoltaic(PV)systems have led to their wide-spread adoption in recent years as a source of electricity ***,precisely identifying a PV system’s maximum power point(MPP)under normal and shaded weather conditions is crucial to conserving the maximum generated *** of the biggest concerns with a PV system is the existence of partial shading,which produces multiple peaks in the P–V characteristic *** these circumstances,classical maximum power point tracking(MPPT)approaches are prone to getting stuck on local peaks and failing to follow the global maximum power point(GMPP).To overcome such obstacles,a new Lyapunov-based Robust Model Reference Adaptive Controller(LRMRAC)is designed and implemented to reach GMPP rapidly and *** proposed controller also achieves MPP accurately under slow,abrupt and rapid changes in radiation,temperature and load *** and OPAL-RT real-time simulators in various scenarios are performed to verify the superiority of the proposed approach over the other state-of-the-art methods,i.e.,ANFIS,INC,VSPO,and P&*** and GMPP are accomplished in less than 3.8 ms and 10 ms,*** on the results presented,the LRMRAC controller appears to be a promising technique for MPPT in a PV system.

关键词： Photovoltaic(PV) MPPT Partial shading Lyapunov-based robust model reference adaptive control(LRMRAC) Lyapunov stability

Influence of tool rotation speeds on mechanical and morphological properties of friction stir processed nano hybrid composite of MWCNT-Graphene-AZ31 magnesium

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Journal of Magnesium and Alloys 2019年第3期7卷 487-500页

作者： Sanjay Sharma Amit Handa Sahib Sartaj Singh deepak Verma I.K.Gujral punjab technical university kapurthalaIndia punjabi university patialaindia graphic era hill university dehradunindia

The ever-increasing demand for light weighted hard materials for transportation industries encouraged researchers to develop composites with excellent mechanical properties which can transform it into more economical and *** the metals with carbonaceous nanomaterials are progressively in focus due to their excellent capability to inculcate and tailor the properties of *** the present research,a hybrid nanocomposite of MWCNT-Graphene-AZ31 Mg alloy has been developed by using variable tool rotation speeds with friction stir processing(FSP).Optimized reinforcement ratio of 1.6%*** and 0.3%*** graphene have been used with variable tool rotation speeds,whereas other processing parameters are kept *** developed specimens were investigated using standard testing equipment for evaluating and comparing the mechanical properties on the basis of the microstructure of the processing regions and their morphological analysis,according to the ASTM *** obtained results revealed an improvement of 19.72%in microhardness and 77.5% of compressive strength in comparison with the base metal AZ 31 Magnesium alloy,with a tool rotational speed of *** values of tensile stress and percentage area reduction were recorded as less than that of the base metal matrix,but an increasing trend has been observed in the values of both with the improvement on rotational speeds of the *** effectual strengthening mechanisms are analyzed on the bases of SEM images and observed that discussed and found that grain refinement strengthening is the major contributor to the strength of the nanocomposite.

关键词： MMCs(Metal Matrix composites) Friction stir processing(FSP) Multi-walled carbon nanotubes(MWCCT) Graphene Nano Particular Stir Zone(SZ) Thermo-mechanically affected zone(TMAZ) Heat Affected Zone(HAZ)