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Protection and Control of Modern Power Systems 2024年第4期9卷 23-38页

作者： Praveen Kumar Gupta Priyanshul niranjan Niraj Kumar Choudhary Nitin Singh Ravindra Kumar Singh the Department of Electrical Engineering Motilal Nehru National Institute of Technology AllahabadPrayagraj 211004India

Relay coordination is crucial in electrical power systems to protect against malfunctions and damage caused by unexpected events like short *** address the challenge associated with the reverse direction of fault current,dual-setting(DS)directional over-current relays have evolved but failed to provide proper coordination during changes of load,generation,and *** the meantime,with the increasing number of DS relays,the total relay operating time tends to ***,this paper proposes a protection scheme based on the optimal deployment of conventional and dual-setting rate of change of voltage(DS-ROCOV)relays in distribution *** holds true for varying network topologies and is unaffected by variations in load and *** objective of the proposed scheme is to ensure reliable and efficient protection against faults in distribution systems by minimizing the overall operating time with the optimal number of DS-ROCOV *** proposed protection scheme’s performance is evaluated for different coordination time interval values as well as in different microgrid *** paper outlines the design and implementation of the proposed protection scheme which is validated on the modified IEEE 14-bus system using simulations in Matlab/Simulink.

关键词： Coordination time interval DS-ROCOV relay multi-objective optimization optimal-deployment protection coordination

A One Health approach to fight antimicrobial resistance in Uganda: Implementation experience, results, and lessons learned

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Biosafety and Health 2024年第2期6卷 125-132页

作者： Reuben Kiggundu J.P.Waswa niranjan Konduri Hassan Kasuja Marion Murungi Patrick Vudriko Harriet Akello Eric Lugada Cecilia Muiva Esther Were Dinah Tjipura Henry Kajumbula Kate Kikule Emmanuel Nfor Mohan P.Joshi USAID Medicines Technologiesand Pharmaceutical Services ProgramManagement Sciences for HealthKampala 256Uganda USAID Medicines Technologiesand Pharmaceutical Services ProgramManagement Sciences for HealthArlingtonVA 22203USA College of Veterinary Medicine Animal Resources and BiosecurityMakerere UniversityKampala 256Uganda Ministry of Health Uganda Kampala 256Uganda USAID Strengthening Supply Chain Systems Activity Management Sciences for HealthKampala 256Uganda USAID Medicines Technologiesand Pharmaceutical Services ProgramManagement Sciences for HealthNairobi 254Kenya Department of Microbiology College of Health SciencesMakerere UniversityKampala 256Uganda

Uganda has been implementing the Global Health Security Agenda(GHSA)since 2015 to build its capacity according to World Health Organization(WHO)Benchmarks on International Health Regulations *** country remains prone to outbreaks,with more than 20 disease outbreaks reported in the past five years,including Ebola virus disease,Crimean-Congo haemorrhagic fever,Marburg haemorrhagic fever,measles,yellow fever,coronavirus disease 2019(COVID-19),and *** resistance(AMR)is an ongoing *** scored capacity level 3 on infection prevention and control(IPC)and antimicrobial stewardship(AMS)in the 2017 Joint External Evaluation(JEE)*** gaps were being addressed after a self-assessment in *** paper describes the technical assistance approaches provided to Uganda by the Medicines,Technologies,and Pharmaceutical Services Program,funded by the United States(U.S.)Agency for International Development,and implemented by Management Sciences for *** program,through a One Health approach,supported systematic capacity strengthening based on the JEE's capacity advancement framework for global health security,specifically relating to *** program's interventions impacted 32 WHO benchmark actions(7 for AMR multisectoral coordination,16 for IPC,and 9 for AMS),contributing to Uganda's strengthened GHSA *** success built on the AMR platform,the program trained 745 health workers in IPC for the Ebola virus and provided support for simulation exercises by eight district IPC *** program also worked with the Ministry of Health to coordinate IPC for the COVID-19 response in five health regions,covering 45 districts and reaching 5,452 health workers at 858 health facilities.

关键词： One health Antimicrobial resistance Antibiotic resistance Jointexternal evaluation Global health security Uganda Africa WHO Benchmarks for International Health Regulations Capacities

In-plane and out-of-plane quasi-static compression performance enhancement of 3D printed re-entrant diamond auxetic metamaterial with geometrical tuning and fiber reinforcement

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Defence Technology(防务技术) 2023年第7期25卷 1-17页

作者： niranjan Chikkanna Shankar Krishnapillai Velmurugan Ramachandran Department of Mechanical Engineering Indian Institute of Technology Madras600036India Department of Aerospace Engineering Indian Institute of Technology Madras600036India

Auxetic materials are cellular materials with a unique property of negative Poisson’s *** auxeticity and performance of these metamaterials utterly depend on the geometrical parameters and loading *** the first time,the quasi-static uniaxial compression performance of fused filament fabricated re-entrant diamond auxetic metamaterial is evaluated in the x-direction(in-plane)and z-direction(out-of-plane).The most commonly used thermoplastic feedstock,Acrylonitrile butadiene styrene,is considered a material of *** effect of influential geometrical parameters of the re-entrant diamond structure and printing parameter is systematically studied using Taguchi’s design of ***-based multi-objective optimisation technique has been adopted to arrive at the optimal *** are made to improve the stiffness and strength of the structure with fibre *** glass fibre reinforcements have enhanced specific strength and stiffness in both in-plane and out-ofplane directions.A sevenfold and thirteen times increase in specific strength and energy absorption is evident for glass fibre-reinforced structures in out-of-plane directions compared to in-plane *** tuning of geometrical parameters of the re-entrant diamond structure can result in a Poisson’s ratio of up to-3.49 when tested in the *** parametric study has illustrated the tailorability of the structure according to the application *** statistical study has signified each considered parameter’s contribution to the compression performance characteristics of the 3D printed re-entrant diamond auxetic metamaterial.

关键词： Auxeticity Fibre reinforcement Tailorability Anisotropy Geometrical influence Property enhancement

Performance comparison of mono and polycrystalline silicon solar photovoltaic modules under tropical wet and dry climatic conditions in east-central India

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Clean Energy 2022年第1期6卷 165-177页

作者： niranjan Singh Baghel Nikhil Chander Department of Electrical Engineering and Computer Science Indian Institute of Technology BhilaiGEC CampusSejbaharRaipur-492015ChhattisgarhIndia

This work focuses on the performance comparison of monocrystalline and polycrystalline Si solar photovoltaic(SPV)modules under tropical wet and dry climatic conditions in east-central India(21.16°N 81.65°E,Raipur,Chhattisgarh).This study would help to select the SPV module for system installation in the east-central part of the *** comparative analysis,we used performance ratio(PR)and efficiency as figures of *** plane-of-array(POA)irradiance was used to determine the efficiency of the *** decomposition and transposition models calculated the POA values from the measured global horizontal *** data were analysed systematically for 6 months in the non-rainy season,from October 2020 to March *** attention was given to solar irradiance,ambient temperature and module temperature-the parameters that affect the performance of PV *** month of October showed the highest variation in irradiance and *** highest average module temperatures(51-52℃)were observed in October-November,while the lowest average module temperatures(34℃ for mono-Si and 36℃ for poly-Si)were observed in *** highest value of average monthly POA irradiance(568 W/m^(2))was observed in February and the lowest(483 W/m^(2))in *** results showed that the monocrystalline SPV module performed better than the polycrystalline module under all weather *** maximum observed values of mono-Si and poly-Si panel PRs were 0.89 and 0.86,respectively,in December.

关键词： solar photovoltaic performance climatic conditions global horizontal irradiance plane-of-array

Effect of Inclined Tension Crack on Rock Slope Stability by SSR Technique

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Intelligent Automation & Soft Computing 2023年第4期36卷 1205-1214页

作者： Ch.Venkat Ramana niranjan Ramchandra Thote Arun Kumar Singh Visvesvaraya National Institute of Technology Nagpur440010India

The tension cracks and joints in rock or soil slopes affect their failure *** of rock or soil slope failure is one of the most challenging tasks in the earth *** actual slopes consist of inhomogeneous materials,complex morphology,and erratic *** studies concerning the failure of rock slopes primarily focused on determining Factor of Safety(FoS)and Critical Slip Surface(CSS).In this article,the effect of inclined tension crack on a rock slope failure is studied numerically with Shear Strength Reduction Factor(SRF)*** inclined Tension Crack(TC)inﬂuences the magnitude and location of the rock slope’s Critical Shear Strength Reduction Factor(CSRF).Certainly,inclined cracks are more prone to cause the failure of the slope than the vertical ***,all tension cracks do not lead to failure of the slope *** effect of the crest distance of the tension crack is also *** numerical results do not show any signiﬁcant change in the magnitude of CSRF unless the tip of the TC is very near to the crest of the *** is also replaced with a joint,and the results differ from the corresponding *** results are discussed regarding shear stress and Critical Slip Surface(CSS).

关键词： Crest distance critical shear strength reduction factor critical slip surface inclined tension crack joint

SYNTHESIS AND CHARACTERIZATION OF A FLAME RETARDANT HYPERBRANCHED POLYETHER

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Chinese Journal of Polymer Science 2010年第1期28卷 107-118页

作者： Jyotishmoy Borah 汪传生 niranjan Karak College of Electromechanical Engineering Qingdao University of Science and Technology Department of Chemical Sciences Tezpur UniversityNapaamIndia-784028

A brominated hyperbranched polyether has been synthesized from cyanuric chloride and sodium salt of tetrabromobisphenol-A by an A2 ＋ B3 approach. The synthesized polyether was characterized by ^1H-NMR, ^13C-NMR, UV, FTIR spectroscopy and X-ray diffraction studies, measurements of solution viscosity, molecular weight and solubility and elemental and thermogravimetric analyses. The flame retardancy of the synthesized polyether and its blends with commercially available plasticized poly（vinyl chloride）（PVC） and low density polyethylene （LDPE） was investigated by measurements of limiting oxygen index （LOI） value and thermogravimetric analysis. The properties are compared with a non-halogenated similar type of bisphenol-A based aromatic polyether after blending at different dose levels with the same base polymers. The LOI values of these blends indicated that these hyperbranched polyethers acted as flame retardant additives, and antimony trioxide had prominent synergistic effect with the bromo hyperbranched polyether for the above base polymers, and an increment of 4 to 6 units in LOI values was observed.

关键词： Hyperbranched polyether LOI LDPE PVC.

Solar-Driven Hydrogen Peroxide Production Using Polymer-Supported Carbon Dots as Heterogeneous Catalyst

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Nano-Micro Letters 2017年第4期9卷 30-40页

作者： Satyabrat Gogoi niranjan Karak Advanced Polymer and Nanomaterial Laboratory Department of Chemical SciencesTezpur UniversityTezpur 784028AssamIndia

Safe, sustainable, and green production of hydro gen peroxide is an exciting proposition due to the role of hydrogen peroxide as a green oxidant and energy carrier for fuel cells. The current work reports the development of carbon dot-impregnated waterborne hyperbranched polyurethane as a heterogeneous photo-catalyst for solar-driven production of hydrogen peroxide. The results reveal that the carbon dots possess a suitable band-gap of 2.98 eV,which facilitates effective splitting of both water and ethanol under solar irradiation. Inclusion of the carbon dots within the eco-friendly polymeric material ensures their catalytic activity and also provides a facile route for easy catalyst separation, especially from a solubilizing *** overall process was performed in accordance with the principles of green chemistry using bio-based precursorsand aqueous medium. This work highlights the potential of carbon dots as an effective photo-catalyst.

关键词： Carbon dot Photo-catalyst Heterogeneous catalyst Hydrogen peroxide

Magnesium alloys as extremely promising alternatives for temporary orthopedic implants-A review

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Journal of Magnesium and Alloys 2023年第8期11卷 2688-2718页

作者： C.A.niranjan T.Raghavendra Madhuri P.Rao C.Siddaraju M.Gupta Vikram Kumar S.Jain R.Aishwarya Department of Industrial Engineering and Management Ramaiah Institute of TechnologyBengaluru-54India Department of Mechanical Engineering National Institute of EngineeringMysuru-08India Department of Chemistry B.M.S.College of EngineeringBengaluru-19India Department of Mechanical Engineering Ramaiah Institute of TechnologyBengaluru-54India Department of Mechanical Engineering NUS Singapore-75Singapore Department of Metallurgical and Materials Engineering Indian Institute of TechnologyMadras-36India

Mg alloys are emerging as potential and very promising alternatives for replacing permanent metallic implant materials such as steels and titanium in applications where the implants need to be removed following healing through revision *** of Mg alloys for implant application is seen as a game changer and Mg alloys are almost perfect materials for the future in both engineering and biomedical *** review therefore focuses on highlighting significance of Mg alloys in biomedical field and risks of using permanent metallic implants particularly when the implants are no longer required after the injury is *** this review,importance of orthopedic implants in present scenario,serious concern related to accidents that are causing permanent disabilities,demand in orthopedic implant market worldwide,potential applications of Mg based materials and their compatibility in biological environment is presented and *** addition,degradation rate,major reactions associated with Mg based materials and effect of alloying elements on implant performance are also discussed based on in-vivo *** advances in development of Mg alloys through various techniques and their performance in in-vitro conditions are also *** ways to eliminate the limitations of Mg alloys include alloying,melt purification,surface alterations,surface modifications,chemical treatment,secondary processing *** *** and opportunities for Mg alloys to become ideal implant material is also addressed.

关键词： Accidents Fractures Burden of fracture Magnesium Ultimate alternative Degradation rate Alloying Melt purification Coating

Evaluation of regression algorithms for estimating leaf area index and canopy water content from water stressed rice canopy reflectance

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Information Processing in Agriculture 2021年第2期8卷 284-298页

作者： niranjan Panigrahi Bhabani Sankar Das Agricultural and Food Engineering Department Indian Institute of Technology KharagpurWest Bengal 721302India School of Water Energy and EnvironmentCranfield UniversityCranfield MK430ALUK

Optical remote sensing(RS)with robust algorithms is needed for accurate assessment of crop canopy *** intensive studies on algorithms,their performance using RS needs to be *** evaluated five different algorithms(partial-least-squares regression(PLSR),support vector regression(SVR),random forest regression(RFR),locally-weighted-PLSR(PLSRLW)and PLSR with feature selection(PLSRFS))for rapid assessment of leaf area index(LAI)and canopy water content(CWC)for rice canopies using canopy reflectance spectra over visible to short-wave infrared *** pooled datasets of LAI(600)and CWC(480)were collected from two replicated field experiments during 2014–15 and 2015–16 rice growing *** performance of each algorithm was evaluated using coefficient of determination(R^(2)).Results showed that PLSRLW performed more accurately than other algorithms with R^(2) values 0.77 and 0.66 for LAI and CWC,*** also used a bootstrapping approach to generate a kernel density estimator of root mean squared error values for each *** results suggested that the improvement in prediction accuracy of LAI and CWC can be achieved if a suitable algorithm is selected by assigning higher weights to calibration samples,which has similar canopy structure as the test *** of the canopy spectral data results large error values in test dataset,therefore the use of entire season canopy spectral data should be used for model calibration.

关键词： Rice canopy Reflectance spectroscopy Calibration Retrieval algorithms Partial-least-squares regression

Transmission congestion management considering multiple and optimal capacity DGs

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Journal of Modern Power Systems and Clean Energy 2017年第5期5卷 713-724页

作者： Rajagopal PEESAPATI Vinod Kumar YADAV niranjan KUMAR Department of Electrical Engineering National Institute of Technology JamshedpurJamshedpurJharkhand 831014India Department of Electrical Engineering Gautam Buddha UniversityNoida 201334India

Transmission congestion management became a grievous issue with the increase of competitiveness in the power systems. Competitiveness arises due to restructuring of the utilities along with the penetration of auxiliary services. The present study depicts a multi objective technique for achieving the optimal capacities of distributed generators(DG) such as solar, wind and biomass in order to relieve congestion in the transmission lines. Objectives like transmission congestion, real power loss, voltages and investment costs are considered to improve the technical and economical performances of the network. Multi objective particle swarm optimization algorithm is utilized to achieve the optimal sizes of unity power factor DG *** insisted methodology is practiced on IEEE-30 and IEEE-118 bus systems to check the practical *** results of the proposed approach are compared with the genetic algorithm for both single and multi-objective cases. Results revealed that the intimated method can aid independent system operator to remove the burden from lines in the contingency conditions in an optimal manner along with the improvement in voltages and a reduction in real power losses of the network.

关键词： Transmission congestion Optimal power flow Distributed generation Particle swarm optimization