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Performance analysis of multiple gain boost converter with hybrid maximum power point tracker for solar PV connected to grid

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Clean Energy 2021年第4期5卷 655-672页

作者： b.M.Kiran Kumar M.S.Indira S.Nagaraja rao M S Ramaiah University of Applied Sciences Department of Electrical EngineeringBangaloreIndia-560058

This paper analyses the performance of a multiple gain boost converter(MGbC)connected to a solar photovoltaic(SPV)system with a grid-tied *** capacitor inductor capacitor(CLC)-based MGbC is integrated to lift the output voltage of the SPV to the required *** voltage lifts/levels in a boost converter(bC)are based on the number of CLC *** suggested MGbC is compared with various conventional bCs in terms of boost factor and component count.A hybrid fuzzy logic-perturb&observe maximum power point tracker(HFL-P&O MPPT)developed is used to monitor P_(max)(maximum power)generated by the ***,a comparative analysis of the suggested MPPT with a conventional P&O and fuzzy logic-based(FLb)MPPT for a CLC-based MGbC is *** comparison is made in terms of rise time,voltage ripples(%),steady-state time and boost *** output characteristics of the developed model for different irradiation conditions are analysed using the MATLAb/Simulink *** MPPT simulation result exhibits minimum oscillations at MPP and a significantly better rise time of 0.015 s when compared with a conventional MPPT and FLb *** proposed CLC-MGbC gives an appreciable boost factor of *** generated SPV power is supplied to the grid through a conventional inverter and synchronized using a phase-locked loop *** total harmonic distortion of 1.66%obtained in the output current of the inverter is within the permissible range of the IEEE standards.

关键词： CLC-MGbC FLb MPPT Grid-tie inverter SPV THD

Exact Synchronization for a Coupled System of Wave Equations with Dirichlet boundary Controls

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Chinese Annals of Mathematics,Series b 2013年第1期34卷 139-160页

作者： Tatsien LI bopeng rao Nonlinear Mathematical Modeling and Methods Laboratory Shanghai Key Laboratory for Contemporary Applied Mathematic School of Mathematical Sciences Fudan University Institut de Recherche Mathématique Avancée Université de Strasbourg

In this paper, the exact synchronization for a coupled system of wave equations with Dirichlet boundary controls and some related concepts are introduced. by means of the exact null controllability of a reduced coupled system, under certain conditions of compatibility, the exact synchronization, the exact synchronization by groups, and the exact null controllability and synchronization by groups are all realized by suitable boundary controls.

关键词： Exact null controllability Exact synchronization Exact synchronizationby groups

Exact boundary Controllability for a Coupled System of Wave Equations with Neumann boundary Controls(Dedicated to Professor Haim brezis on the occasion of his 70th birthday)

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Chinese Annals of Mathematics,Series b 2017年第2期38卷 473-488页

作者： Tatsien LI bopeng rao school of mathematical sciences fudan universityShanghai 200433China/shanghai key laboratory for contemporary applied mathematics/nonlinear mathematical modeling and methods laboratory institut de recherche mathmatique avancée universite de strasbourgFrance

This paper first shows the exact boundary controllability for a coupled system of wave equations with Neumann boundary controls. In order to establish the corresponding observability inequality, the authors introduce a compact perturbation method which does not depend on the Riesz basis property, but depends only on the continuity of projection with respect to a weaker norm, which is obviously true in many cases of application. Next,in the case of fewer Neumann boundary controls, the non-exact boundary controllability for the initial data with the same level of energy is shown.

关键词： Compactness-uniqueness perturbation, boundary observability, Exactboundary controllability, Non-exact boundary controllability, Coupledsystem of wave equations, Neumann boundary condition

e-FILTERS OF MS-ALGEbRAS

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Acta Mathematica Scientia 2013年第3期33卷 738-746页

作者： M. Sambasiva rao Department of Mathematics M.V.G.R. College of EngineeringChintalavalasa Vizianagaram Andhra Pradesh India-535005

The notion of e-filters is introduced in an MS-algebra and characterized. The concept of D-filters is introduced and a set of equivalent conditions under which every D-filter is an e-filter are given. The properties of the space of all prime e-filters of an MS-algebra are observed. The concept of D-prime filters is introduced and then a set of equivalent conditions axe derived for a prime e-filter to become a D-prime filter in topological terms.

关键词： MS-algebra e-filter dense element D-filter D-prime filter minimal prime filter Hausdorff space

Investigation of hepatoprotective activity of Cyathea gigantea(***.)leaves against paracetamol-induced hepatotoxicity in rats

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Asian Pacific Journal of Tropical biomedicine 2012年第5期2卷 352-356页

作者： P Madhu Kiran A Vijaya Raju b Ganga rao A.U College of Pharmaceutical Sciences Andhra University

Objective:To investigate the hepatoprotective activity of methanolic leaf extract of Cyathea gigantea(***)against paracetamol induced liver damage in ***:The hepatoprotective activity for plant extract was investigated for paracetamol induced hepatoxicity in *** albino rats of either sex were divided into five groups of 6 animals each and are given orally the following treatment for seven *** normal control group was given 1%*** 1mL/kg bw,*** at dose of 1g/kg bw,*** given as toxic dose for inducing ***(50mg/kg.p.o.) was given as reference *** doses of C. gigantea extract i.e.,100 mg/*** 200 mg/kg,*** tested for hepatoprotective activity. The treatment was given for seven days and after 24 h of last treatment blood was collected from retro-orbital plexus and analysed for various serum parameters like serum glutamic-oxaloacetic transaminase(SGOT),serum glutamic pyruvic transaminase(SGPT),alkaline phosphatase(ALP),total bilirubin(Tb)and total protein(TP)in different ***:The paracetamol intoxication lead to histological and biochemical *** treatment with methanolic leaf extract of *** reduced the elevated levels of SCOT,SGPT,ALP,Tb and also reversed the hepatic damage towards normal which further supports the hepatoprotective activity of leaf extract of ***:The methanolic extract of leaves of *** at doses of 100 mg/kg bw and 200 mg/kg bw have significant effect on liver of paracetamol induced hepatotoxicity model in rats.

关键词： Hepatoprotective Cyathea gigantea Paracetamol Silymarin Hepatotoxicity

Selection of effective and highly thermostable bacillus subtilis lipase A template as an industrial biocatalyst-A modern computational approach

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Frontiers in biology 2015年第6期10卷 508-519页

作者： b. Senthilkumar D. Meshachpaul rao Sethumadhavan R. Rajasekaran School of biosciences and Technology Bioinformatics Division VIT University Vellore 632014 Tamil Nadu India

biocatalysts are intrinsically reactive and hence their operational stability is of vital significance for any bioprocess. The setback in biocatalyst stability has been tackled from diverse prospects. Inherently, stable biocatalysts are markedly realized and a regular attempt is being made to seek out new organisms that harbor them. Here, we analyzed the industrial biocatalyst lipase A （Native） of bacillus subtilis and its six thermostable mutants （2M, 3M, 4M, 6M, 9M and 12M） computationally using conformational sampling technique. Consequently, the various structural events deciphering thermostability like root mean square deviation, root mean square fluctuation, radius of gyration and polar surface area showed mutant 12M to be highly stable with statistical validation. besides, static model analysis involving intra-molecular interactions, secondary structure, solvent accessibility, hydrogen bond pattern, simulated thermal denaturation and desolvation energy also supported 12M comparatively. Of note, the presence of high secondary structural rigidity and hydrogen bonds increased thermostability and functionality of 12M, thus selecting it as a best template for designing thermostable lipases in future. Also, this study has a significant implication toward a better understanding of conformational sampling in enzyme catalysis and enzyme engineering.

关键词： thermophilic bacillus subtilis lipase A conformational analysis docking

Hydro-elastic computational analysis of a marine propeller using two-way fluid structure interaction

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Journal of Ocean Engineering and Science 2022年第3期7卷 280-291页

作者： V.Rama Krishna Srinivas Prasad Sanaka N.Pardhasaradhi b.Raghava rao Naval Science&Technological Laboratory Visakhapatnam532007India Department of Mechanical Engineering V.R.Siddhartha Engineering CollegeVijayawada520007India

Marine propellers have complex geometry and their performance is determined by costly and time consuming open water *** of numerical techniques helps researchers in effective design of *** approaches are used that predicted either hydrodynamic and acoustic response or structural ***-way fluid-structure interaction(FSI)analysis is a very useful approach providing all three responses which helps in the design,analysis and optimization of a *** objective of this paper is to predict the hydro-elastic response of a propeller using two-way FSI on a 0.2m diameter,DTMb-4119 propeller using ANSYS ***-way FSI analysis is carried out using system coupling approach that transfers the data between the structural and fluid *** turbulence effects are captured using the large-eddy simulation(LES)model and the Ffowcs Williams Hawkings(FWH)acoustic model is used for evaluating the sound pressure level(SPL)generated by *** is extended to evaluate the hydro-elastic and acoustic response of the propeller after validating the hydrodynamic performance with the experimental result in the *** results from Two-way FSI analysis are in close agreement when compared with the one-way FSI ***-way FSI can accommodate the peak value of stress and deformation developed during the initial part of the transient solution which is important in the design of *** study reveals that metallic(NAb)propeller can be replaced by a composite *** acoustic response from two-way FSI analysis will be more realistic due to the consideration of hydro-elastic effect of propeller.

关键词： Advance ratio Coupled analysis CFD Marine propeller Hydrodynamic parameters Two-way fluid structure interaction

Impact of Cyclone Nilam on Tropical Lower Atmospheric Dynamics

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Advances in Atmospheric Sciences 2016年第8期33卷 955-968页

作者： P.VINAY KUMAR Gopa DUTTA M.V.RATNAM E.KRISHNA b.bAPIRAJU b.Venkateswara rao Salauddin MOHAMMAD Vignana bharathi Institute of Technology HyderabadTS 501301India National Atmospheric Research Laboratory GadankiAP 517112India Jawaharlal Nehru Technological University HyderabadTS 500085India

A deep depression formed over the bay of bengal on 28 October 2012, and developed into a cyclonic storm. After landfall near the south coast of Chennai, cyclone Nilam moved north-northwestwards. Coordinated experiments were conducted from the Indian stations of Gadanki（13.5？N, 79.2？E） and Hyderabad（17.4？N, 78.5？E） to study the modification of gravity-wave activity and turbulence by cyclone Nilam, using GPS radiosonde and mesosphere–stratosphere–troposphere radar data. The horizontal velocities underwent large changes during the closest approach of the storm to the experimental sites. Hodograph analysis revealed that inertia gravity waves（IGWs） associated with the cyclone changed their directions from northeast（control time） to northwest following the path of the cyclone. The momentum flux of IGWs and short-period gravity waves（1–8 h） enhanced prior to, and during, the passage of the storm（±0.05 m2s-2and ±0.3 m2s-2, respectively）, compared to the flux after its passage. The corresponding body forces underwent similar changes, with values ranging between ±2–4m s-1d-1and ±12–15 m s-1d-1. The turbulence refractivity structure constant（C2n） showed large values below 10 km before the passage of the cyclone when humidity in the region was very high. Turbulence and humidity reduced during the passage of the storm when a turbulent layer at ～17 km became more intense. Turbulence in the lower troposphere and near the tropopause became weak after the passage of the cyclone.

关键词： inertia gravity waves turbulence momentum flux convective process tropical cyclone

Exact boundary Synchronization for a Coupled System of Wave Equations with Neumann boundary Controls

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Chinese Annals of Mathematics,Series b 2018年第2期39卷 233-252页

作者： Tatsien LI Xing LU bopeng rao Dedicated to Philippe G. Ciarlet on the occasion of his 80th birthda

In this paper, for a coupled system of wave equations with iNeumann boundary controls, the exact boundary synchronization is taken into consideration. Results are then extended to the case of synchronization by groups. Moreover, the determination of the state of synchronization by groups is discussed with details for the synchronization and for the synchronization by 3-groups, respectively.

关键词： Exact boundary synchronization, Exact boundary synchronization bygroups State of synchronization, State of synchronization by groups Coupled system of wave equations, Neumann boundary control