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Evaluation of series-parallel-cross-tied PV array configuration performance with maximum power point tracking techniques under partial shading conditions

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Clean Energy 2023年第3期7卷 620-634页

作者： Dharani kumar Narne T.A.ramesh kumar RamaKoteswaraRao Alla Department of Electrical Engineering Annamalai UniversityAnnamalai NagarChidambaramTamilnadu-608002India Department of Electrical and Electronics Engineering RVR&JC College of EngineeringGunturAndhra Pradesh-522019India

Tracking the maximum power point is a critical issue with solar *** power output of the solar panel varies due to variations in irradiance and *** irradiation due to partial shading conditions has a direct impact on the characteristics of photovoltaic(PV)*** build a diversity of maximum power point tracking algorithms in solar PV systems,this work focuses on perturb and observe,incremental conductance,and fuzzy logic control *** suggested fuzzy logic control method outperformed the conventional incremental conductance and perturb and observe algorithms with a collection of 49 *** paper presents a novel series-parallel-cross-tied PV array configuration with a developed fuzzy *** comment on the performance of a proposed system under various partial shading conditions,a series-parallel PV array configuration has been *** simulation result demonstrates that the fuzzy method has a percentage improvement in the global maximum power point tracking efficiency of 24.85%when compared to the perturb and observe method and a 65.5%improvement when compared to the incremental conductance method under long wide partial shading *** the case of the middle partial shading condition,the fuzzy method has a percentage improvement in the global maximum power point tracking efficiency of 12.4%compared to the perturb and observe method and a 60.7%improvement compared to the incremental conductance method.

关键词： Maximum Power Point Tracking Partial shading,Fuzzy Logic Controller Series Parallel-Cross Tied PV array configuration Series-Parallel PV array configuration

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Synthesis,characterization and application of Lagerstroemia speciosa embedded magnetic nanoparticle for Cr(Ⅵ)adsorption from aqueous solution

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Journal of Environmental Sciences 2017年第5期29卷 283-293页

作者： Shalini srivastava Shashi Bhushan Agrawal Monoj kumar Mondal Department of Botany Institute of Science Banaras Hindu University Varanasi 221005 India Department of Chemical Engineering and Technology Indian Institute of Technology Banaras Hindu University Varanasi 221005 Uttar Pradesh India

Lagerstroemia speciosa bark（LB） embedded magnetic nanoparticles were prepared by co-precipitation of Fe2＋ and Fe3＋ salt solution with ammonia and LB for Cr（Ⅵ） removal from aqueous *** native LB,magnetic nanoparticle（MNP）,*** embedded magnetic nanoparticle（MNPLB） and Cr（Ⅵ） adsorbed MNPLB particles were characterized by SEM-EDX,TEM,BET-surface area,FT-IR,XRD and TGA *** analysis confirmed nearly spherical shape of MNP with an average diameter of 8.76 nm and the surface modification did not result in the phase change of MNP as established by XRD analysis,while led to the formation of secondary particles of MNPLB with diameter of 18.54 *** results revealed covalent binding between the hydroxyl group of MNP and carboxyl group of LB particles and further confirmed its physico-chemical nature favorable for Cr（Ⅵ） *** Cr（Ⅵ） adsorption on to MNPLB particle as an adsorbent was tested under different contact time,initial Cr（Ⅵ） concentration,adsorbent dose,initial pH,temperature and agitation *** results of the equilibrium and kinetics of adsorption were well described by Langmuir isotherm and pseudo-second-order model,*** thermodynamic parameters suggest spontaneous and endothermic nature of Cr（Ⅵ）adsorption onto *** maximum adsorption capacity for MNPLB was calculated to be 434.78 mg/g and these particles even after Cr（Ⅵ） adsorption were collected effortlessly from the aqueous solution by a *** desorption of Cr（Ⅵ）-adsorbed MNPLB was found to be more than 93.72%with spent MNPLB depicting eleven successive adsorption-desorption cycles.

关键词： Lagerstroemia speciosa Magnetic nanoparticles Co-precipitation Cr(Ⅵ) ions Adsorption capacity

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Drillability prediction in some metamorphic rocks using composite penetration rate index(CPRI)–An approach

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International Journal of Mining Science and Technology 2021年第4期31卷 631-641页

作者： Gaurav kumar srivastava M.S.R.Murthy Vemavarapu Department of Mining Engineering Indian Institute of Technology(Indian School of Mines)Dhanbad 826004India

Assessment of drillability of rocks is vital in the selection,operation,and performance evaluation of cutting tools used in various excavation machinery deployed in mining and *** commonly used rock drillability prediction methods,namely,drilling rate index(DRI)and Cerchar hardness index(CHI)have limitations in predicting the penetration rate due to differential wear of the cutting tool in rocks with varied hardness and *** cutting tools get blunt differently in different rocks,the stress beneath the tip of the bit decreases until it reaches a threshold value beyond which the penetration rate becomes *** this research,a new composite penetration rate index(CPRI)is suggested based on the investigations on four metamorphic rocks ***,gneiss,schist and phyllite with varied hardness-abrasivity *** penetration-time behavior was classified into active,moderate,passive,and dormant phases based on the reduction in penetration rate at different stages of drilling.A comparison of predicted penetration rate values using DRI and CPRI with actual penetration rate values clearly establishes the supremacy of ***-structure and hardness-based index was also developed and correlated with *** new indices can help predict cutting tool penetration and its consumption more accurately.

关键词： Abrasivity Hardness Drillability Metamorphic rocks Composite penetration rate index(CPRI)

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Fuzzy–frequency ratio model for avalanche susceptibility mapping

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International Journal of Digital Earth 2016年第12期9卷 1168-1184页

作者： Satish kumar Snehmani Pankaj kumar srivastava Akshay Gore Mritunjay kumar Singh College of Engineering Studies University of Petroleum&Energy Studies(UPES)DehradunUttarakhandIndia Snow and Avalanche Study Establishment Defence Research&Development Organisation(DRDO)ChandigarhIndia Spatial Strokes Technologies Private Limited ZirakpurPunjabIndia

Avalanche activities in the Indian Himalaya cause the majority of fatalities and responsible for heavy damage to the *** susceptibility maps assist decision-makers and planners to execute suitable measures to reduce the avalanche *** the present study,a probabilistic data-driven geospatial fuzzy–frequency ratio(fuzzy–FR)model is proposed and developed for avalanche susceptibility mapping,especially for the large undocumented *** fuzzy–FR model for avalanche susceptibility mapping is initially developed and applied for Lahaul-Spiti *** fuzzy–FR model utilized the six avalanche occurrence factors(***,aspect,curvature,elevation,terrain roughness and vegetation cover)and one referent avalanche inventory map to generate the avalanche susceptibility *** 292 documented avalanche locations from the avalanche inventory map,233(80%)were used for training the model and remaining 59(20%)were used for validation of the *** avalanche susceptibility map is validated by calculating the area under the receiver operating characteristic curve(ROC-AUC)*** validation of the results using ROC-AUC technique,the success rate and prediction rate were *** values of success rate and prediction rate were 94.07%and 91.76%,*** validation of results using ROC-AUC indicated the fuzzy–FR model is appropriate for avalanche susceptibility mapping.

关键词： Snow avalanche avalanche susceptibility mapping GIS fuzzy–frequency ratio(fuzzy–FR)model Lahaul&Spiti

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Trio-Geometric mean-based three-stage Runge–Kutta algorithm to solve initial value problem arising in autonomous systems

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International Journal of Modeling, Simulation, and Scientific Computing 2018年第4期9卷 83-94页

作者： Vijeyata Chauhan Pankaj kumar srivastava Department of Mathematics Jaypee Institute of Information Technology Noida-201304 India

In the present worldwide scenario,plenty of problems arising in science and engineering which can be modeled as differential equations and out of these,autonomous system has become a subject of great *** laws of physics in which time is considered as an independent variable are expressed as autonomous *** this paper,Runge–Kutta(RK)three-stage geometric mean method is used to solve the initial value problem arises in autonomous *** method is discussed in detail,convergence of method is discussed,the accuracy and efficiency of the method are proved by considering a numerical *** result is compared to some other methods and proposed method is found to be more *** detailed analysis of error estimation confirms that proposed method is more efficient as compared to other methods.

关键词： Autonomous IVP geometric mean absolute error explicit Runge-Kutta method.

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FPGA Implementation of 5G NR Primary and Secondary Synchronization

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Computers, Materials & Continua 2022年第10期73卷 1585-1600页

作者： Aytha ramesh kumar K.Lal Kishore Department of ECE VNR Vignana Jyothi Institute of Engineering&TechnologyHyderabad500090India JNTUA Former Vice ChancellorIndia

The 5G communication systems are widely established for highspeed data processing to meet users *** 5G New Radio(NR)communications comprise a network of ultra-low latency,high processing speeds,high throughput and rapid synchronization with a time frame of 10 *** between User Equipment(UE)and 5G base station known as gNB is a fundamental procedure in a cellular system and it is performed by a synchronization *** 5G NR system,Primary Synchronization Signal(PSS)and Secondary Synchronization Signal(SSS)are used to detect the best serving base station with the help of a cell search *** paper aims to determine the Physical Cell Identity(PCI)by using primary synchronization and secondary synchronization *** PSS and SSS detection for finding PCI is implemented on Zynq-7000 series Field Programmable Gate Arrays(FPGA)*** are reconfigurable devices and easy to design complex circuits at high *** proposed architecture employs Primary Synchronization Signal(PSS)and Secondary Synchronization Signal(SSS)detection aims with high speed and low power *** synchronization blocks have been designed and the synthesized design block is implemented on the Zynq-7000 series Zed board with a maximum operating clock frequency of 1 GHz.

关键词： 5G new radio FPGA physical cell identity primary and secondary synchronization

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Resource potential and planning for exploration of the Hebrus Valles, Mars

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Research in Astronomy and Astrophysics 2019年第8期19卷 99-114页

作者： Ravi Sharma Neeraj srivastava Santosh kumar Yadav J.J.T.University JhunjhunuRajasthan333001India Planetary Science Division Physical Research LaboratoryAhmedabad380009India

Mars is the only extraterrestrial body which could host primitive lifeforms and also has the potential to host a human base in the near future. Towards fulfilling these objectives, several remote sensing missions and rover based missions have been sent to Mars. Still, confirmation of existing or extinct life on this planet in any form has not been achieved and possibly human missions at selected sites in the future are the key to addressing this problem. Here, we have used remote sensing data from Mars Reconnaissance Orbiter(MRO;NASA), Mars Global Surveyor(MGS;NASA), Mars Odyssey(NASA) and Mars Express(MEX;ESA) to devise an exploration strategy for one such area known as Hebrus Valles, which is a potential site for human exploration of the surface of Mars. A geological context map of the Hebrus Valles and Hephaestus Fossae region has been prepared and a candidate landing site has been proposed in the Hebrus Valles region. Suitable rover paths have been worked out from the proposed landing site for harnessing the science and resource potential of the region. The proposed landing site is located in the equatorial region at(20?40′N, 126?23′E) and due to its proximity to the Potential Subsurface Access Candidates(PSACs) in the region, such as sinkholes and skylights and also other resources such as crater ejecta, silicate material and fluvial channels, the site is appropriate for exploration of the region.

关键词： planets and satellites:individual (Mars) planets and satellites:surfaces

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Evaluation of the CROPGRO-Peanut model in simulating appropriate sowing date and phosphorus fertilizer application rate for peanut in a subtropical region of eastern India

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作物学报：英文版 2017年第4期5卷 317-325页

作者： Debjani Halder Rabindra kumar Panda Rajiv kumar srivastava Shyamal Kheroar Department of Agriculture Government of West Bengal Mathabhanga Cooch Behar 736 146 West Bengal India School of Infrastructure Indian Institute of Technology Bhubaneswar 751 013 Odisha India Agricultural and Food Engineering Department Indian Institute of Technology Kharagpur 721 302 West Bengal India Department of Agronomy Uttar Banga Krishi Viswavidyalaya Pundibari Cooch Behar 736 165 West Bengal India

Projected changes in weather parameters, mainly temperature and rainfall, have already started to show their effect on agricultural production. To cope with the changing scenarios, adoption of appropriate management strategies is of paramount importance. A study was undertaken to evaluate the most appropriate combination of sowing date and phosphorus fertilization level for peanut crops grown in sandy loam soil in a subhumid region of eastern India. Field experiments were conducted during the summer seasons of 2012 and 2013 on peanut crops at the farm of the Indian Institute of Technology, Kharagpur. The DSSAT v4.5 CROPGRO-Peanut model was used to predict the phenology, growth, and yield of peanut crop under combinations of four sowing dates and four phosphorus fertilization levels. The model was calibrated with a 2012 dataset of growth, phenology, and yield parameters for estimating the genetic coefficients of cultivar TMV-2 and was validated with a 2013 dataset of the same parameters. Simulations of pod yield and other yield parameters using the calibrated model were found to be quite accurate. The model was able to reasonably simulate pod yield and final biomass with low normalized root mean square error (RMSE_n), low absolute root mean square error (RMSE_a) and high coefficient of determination (R^2> 0.7) over a wide range of sowing dates and different phosphorus fertilization levels sensitivity analysis indicated that sowing from the second week of January to the end of February with 30–50 kg P_2O_5 ha^(-1)would give the highest pod yield.

关键词： Sowing date Phosphorus fertilizer CROPGRO-Peanut model Sensitivity analysis RMSE

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Upper ocean high resolution regional modeling of the Arabian Sea and Bay of Bengal

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Acta Oceanologica Sinica 2019年第5期38卷 32-50页

作者： Dwivedi Suneet Mishra Alok kumar srivastava Atul K Banerjee Centre of Atmospheric and Ocean Studies and M N Saha Centre of Space Studies University of Allahabad

In this paper, effort is made to demonstrate the quality of high-resolution regional ocean circulation model in realistically simulating the circulation and variability properties of the northern Indian Ocean(10°S–25°N,45°–100°E) covering the Arabian Sea(AS) and Bay of Bengal(BoB). The model run using the open boundary conditions is carried out at 10 km horizontal resolution and highest vertical resolution of 2 m in the upper *** surface and sub-surface structure of hydrographic variables(temperature and salinity) and currents is compared against the observations during 1998–2014(17 years). In particular, the seasonal variability of the sea surface temperature, sea surface salinity, and surface currents over the model domain is studied. The highresolution model's ability in correct estimation of the spatio-temporal mixed layer depth(MLD) variability of the AS and BoB is also shown. The lowest MLD values are observed during spring(March-April-May) and highest during winter(December-January-February) seasons. The maximum MLD in the AS(BoB) during December to February reaches 150 m (67 m). On the other hand, the minimum MLD in these regions during March-April-May becomes as low as 11–12 m. The influence of wind stress, net heat flux and freshwater flux on the seasonal variability of the MLD is discussed. The physical processes controlling the seasonal cycle of sea surface temperature are investigated by carrying out mixed layer heat budget analysis. It is found that air-sea fluxes play a dominant role in the seasonal evolution of sea surface temperature of the northern Indian Ocean and the contribution of horizontal advection, vertical entrainment and diffusion processes is small. The upper ocean zonal and meridional volume transport across different sections in the AS and BoB is also computed. The seasonal variability of the transports is studied in the context of monsoonal currents.

关键词： Indian Ocean modeling Arabian Sea and Bay of Bengal mixed layer depth transport

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A brief review on tsunami early warning detection using BPR approach and post analysis by SAR satellite dataset

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Journal of Ocean Engineering and Science 2017年第2期2卷 83-89页

作者： Sudhir kumar Chaturvedi Pankaj kumar srivastava Ugur Guven Department of Aerospace Engineering University of Petroleum&Energy StudiesDehradun 248007India Department of Petroleum Engineering&Earth Sciences University of Petroleum&Energy StudiesDehradun 248007India

Tsunami early warning systems have provided to be the extreme importance after the tsunami that hit Japan in March *** research article presents a case study based on the tsunami detection using Bottom Pressure Rate(BPR)measurement and the post the analysis using the SAR datasets.A final decision based system using BPR has been studied to carry out the measurements of tsunami wave *** based study has also been carried out for the post tsunami *** filters are utilized to remove the speckle noise presents in *** scope of this work has also been proposed.

关键词： Remote sensing Tsunami damage detection Epicenter BPR

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