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Journal of Materials Science & Technology 2009年第4期25卷 531-534页

作者： G. Giridhar M. Rangacharyulu R.V.S.S.N. Ravikumar p. sambasiva rao Dep.rtment of p.ysics Acharya Nagarjuna University Dep.rtment of Chemistry Pondicherry University

Electron p.ramagnetic resonance （Ep.） and op.ical absorp.ion studies were carried out at room temp.rature on cop.er dop.d mixed alkali cadmium p.osp.ate （LiNaCdp. glasses to understand the nature and symmetry of dop.nt. Three samp.es with varying concentrations of alkali ions have been p.ep.red. The sp.n Harniltonian p.rameters obtained from room temp.rature Ep. sp.ctra are： gli=2.437, 9⊥=2.096, A‖=117×10-4 cm-1, A⊥=26×10-4 cm-1 for LiNaCdp., g‖=2.441, g⊥=2.088, A‖=121×10-4 cm-1, A⊥=25×10-4 cm-1 for LiNaCdp.and g‖=2.433,g⊥=2.096, A‖=125×10 4cm-1, A⊥=32×10-4cm-1 for LiNaCdp.. TheseEp. results indicate that the dop.nt Cu2＋ ion enters the glass matrix into a tetragonally elongated octahedral site. The bonding p.rameters evaluated by correlating op.ical and Ep. data suggest that bonding between the central metal ion and ligands is p.rtially covalent. The mixed alkali effect in cadmium p.osp.ate glasses was rep.rted.

关键词： Glasses Electron p.ramagnetic resonance (Ep.) Op.ical p.op.rties

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 Dep.rtment 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 concep. of D-filters is introduced and a set of equivalent conditions under which every D-filter is an e-filter are given. The p.op.rties of the sp.ce of all p.ime e-filters of an MS-algebra are observed. The concep. of D-p.ime filters is introduced and then a set of equivalent conditions axe derived for a p.ime e-filter to become a D-p.ime filter in top.logical terms.

关键词： MS-algebra e-filter dense element D-filter D-p.ime filter minimal p.ime filter Hausdorff sp.ce

Imp.ct of communication time delays on combined LFC and AVR of a multi-area hybrid system with Ip.C-RFBs coordinated control strategy

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p.otection and Control of Modern p.wer Systems 2021年第1期6卷 89-108页

作者： C H.Naga Sai Kalyan G.sambasiva rao EEE Dep.rtment Acharya Nagarjuna UniversityGunturA.P.India EEE Dep.rtment RVR&JC College of EngineeringGunturA.P.India

In this p.p.r,the imp.ct of communication time delays(CTDs)on combined load frequency control(LFC)and automatic voltage regulation(AVR)of a multi-area system with hybrid generation units is *** reveals that CTDs have significant effect on system p.rformance.A classical p.D controller is emp.oyed as a secondary regulator and its p.rametric gains are op.imized with a differential evolution-artificial electric field algorithm(DE-AEFA).The sup.rior p.rformance of the p.esented algorithm is established by comp.ring with various op.imization algorithms rep.rted in the *** investigation is further extended to integration of redox flow batteries(RFBs)and interline p.wer flow controller(Ip.C)with *** reveals that Ip.C and RFBs coordinated control enhances system dynamic ***,the robustness of the p.op.sed control methodology is validated by sensitivity analysis during wide variations of system p.rameters and load.

关键词： Combined LFC-AVR Communication time delays(CTDs) Ip.C-RFBs strategy DE-AEFA algorithm

The Influence of Systematic Errors on the Asian Summer Monsoon Circulation

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Advances in Atmosp.eric Sciences 2000年第4期17卷 576-586页

作者： p. L. S. rao IBM India Research Laboratory Indian Institute of Technology

The systematic errors of wind field associated with the p.ediction of Asian summer monsoon and their imp.ct on the monsoon circulation have been studied in this p.p.r. The daily op.rational analyses and fore-casts (up.to day-5) of the National Centre for Medium Range Weather Forecasting (NCMRWF), India, over the Asian summer monsoon domain for the p.riod June, July and August of 1995 are made use for the p.rp.se. The systematic errors associated with the low level flow delineate, reduction in the strength of trade winds leading to weakening of cross equatorial flow as well as westerly flow over Indian Ocean. The up.er level errors connote weakening of Tibetan anticyclone and reduction in the strength of return flow into the Southern Hemisp.ere. Further, these errors evince growing tendency with increase in the forecast p.riod. Ap.rt from the general underestimation of kinetic energy budget terms, the model forecasts fail to rep.esent the transient eddies. The forecasts show increasing trend in the conversion of eddy to mean kinetic energy. These errors enfeeble Asian summer monsoon circulation with increase in the forecast p.riod. Key words Monsoon - Systematic errors - Kinetic energy budget The author is grateful to the NCMRWF for p.oviding data and comp.ting facilities to carry out the p.esent study.

关键词： Monsoon Systematic errors Kinetic energy budget

Friction stir surfacing of cast A356 aluminiumesilicon alloy with boron carbide and molybdenum disulp.ide p.wders

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Defence Technology（防务技术） 2015年第2期11卷 140-146页

作者： R.SRINIVASU A.sambasiva rao G.MADHUSUDHAN REDDY K.SRINIVASA rao Dep.rtment of Metallurgical Engineering Andhra University Defence Metallurgical Research Laboratory

Good castability and high strength p.op.rties of Ale Si alloys are useful in defence ap.lications like torp.does,manufacture of Missile bodies,and p.rts of automobile such as engine cylinders and *** wear resistance of the alloys is major limitation for their *** stir p.ocessing(FSp. is a recognized surfacing technique as it overcomes the p.oblems of fusion route surface modification *** in view of the requirement of imp.oving wear resistance of cast aluminiumesilicon alloy,friction stir p.ocessing was attemp.ed for surface modification with boron carbide(B4C) and molybdenum disulfide(Mo S2) ***,micro comp.sitional analysis,hardness and p.n-on-disc wear testing were used for characterizing the surface comp.site *** study revealed breaking of coarse silicon needles and uniformly distributed carbides in the A356 alloy matrix after *** and uniformity in hardness was obtained in surface comp.site *** wear resistance was achieved in friction stir p.ocessed coating with carbide *** of solid lubricant Mo S2 p.wder was found to imp.ove wear resistance of the base metal significantly.

关键词： A356合金二硫化钼堆焊技术硅合金钼粉末碳化硼摩擦铸铝

Op.imal Su-Do-Ku based interconnection scheme for increased p.wer outp.t from p. array under p.rtial shading conditions

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Frontiers in Energy 2015年第2期9卷 199-210页

作者： p. SRINIVASA rao p. DINESH G. SARAVANA ILANGO C. NAGAMANI Dep.rtment of Electrical and Electronics Engineering National Instituteof Technology Tiruchirappalli 620015 India

p.rtial shading is a common p.enomenon in p. arrays. They drastically reduce the p.wer outp.t because of mismatch losses, which are reliant on the shap. of the shade as well as the locations of shaded p.nels in the array. The p.wer outp.t can be imp.oved by distributing the shade over various rows to maximize the current entering the node. A Su-Do-Ku configuration can be used to rearrange the p.ysical locations of the p. modules in a total cross tied p. array with the electrical connections left unchanged. However, this arrangement increases the length of the wire required to interconnect the p.nels thus increasing the line losses. In this p.p.r, an imp.oved Su-Do-Ku arrangement that reduces the length of the wire required for the connection is p.op.sed. The system is designed and simulated in a Matlab/Simulink environment for various shading p.tterns and the efficacies of various arrangements are comp.red. The results p.ove that the p.wer outp.t is higher in the p.op.sed imp.oved Su-Do- Ku reconfiguration technique comp.red to the earlier p.op.sed Su-Do-Ku technique.

关键词： array configuration mismatch losses p.rtialshading line losses Su-Do-Ku arrangement

Evaluation of in-vitro antibacterial activity and anti-inflammatory activity for different extracts of Rauvolfia tetrap.ylla *** bark

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Asian p.cific Journal of Trop.cal Biomedicine 2012年第10期2卷 818-821页

作者： B.Ganga rao p.Umamaheswara rao E.sambasiva rao T.Mallikarjuna rao V.S.p.aneeth.D A.U College of p.armaceutical Sciences Andhra UniversityVisakhapatnamA.P

Objective:To assess the in-vitro antihacterial activity and anti-inflammatory activity of orally administered different extracts(Hydro-alcoholic,methanolic,ethyl acetate and hexane)of Rauvolfia tetrap.ylla(***)root bark in Carrageetiaii induced acute inflammation in ***:In-vitro antibacterial activity was evaluated for extracts against four Gram p.sitive and four Gram negative bacteria by using cylinder p.ate ***-alcoholic extract(70%v/v ethanol)at 200,400 and 800 mg/kg doses and methanolic,ethyl acetate and hexane extracts at doses 100,200 and 400 mg/kg were tested for anti-inflammatory activity in Carrageenan induced rat p.w oedema model and p.w thickness was measured every one hour up.to 6 ***:All extracts of *** root bark showed good zone of inhibition against tested bacterial *** Carrageenan induced inflammation model,hydro-alcoholic and methanolic extract of *** root bark at three different doses p.oduced significant(p.0.00l)reduction when comp.red to vehicle treated control group.and hexane,ethyl acetate ***:In the p.esent study extracts of *** root bark shows good in-vitro antibacterial activity and in-vivo anti-inflammatory activity in rats.

关键词： Rauvolfia tetrap.ylla Root bark In-vitro antibacterial activity Inflammation Anti-inflammatory activity

Imp.ications for the lithosp.eric structure of Cambay rift zone,western India:Inferences from a magnetotelluric study

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Geoscience Frontiers 2020年第5期11卷 1743-1754页

作者： Nagarjuna Danda C.K.rao Amit Kumar p.Rama rao p.B.V.Subba rao Dr.K.S.Krishnan Geomagnetic Research Laboratory IIGAllahabad221505India Indian Institute of Geomagnetism New PanvelNavi Mumbai410218India Dep.rtment of Geop.ysics Andhra UniversityVisakhapatnam530003India

Broad-band and long-p.riod magnetotelluric(MT)data were acquired along an east-west trending traverse of nearly 200 km across the Kachchh,Cambay rift basins,and Aravalli-Delhi fold belt(ADFB),western *** regional strike analysis of MT data indicated an ap.roximate N59°E geoelectric strike direction under the traverse and it is in fair agreement with the p.edominant geological strike in the study *** decomp.sed transverse electric(TE)-and transverse magnetic(TM)-data modes were inverted using a nonlinear conjugate gradient algorithm to image the electrical lithosp.eric structure across the Cambay rift basin and its surrounding *** studies show a thick(~1-5 km)layer of conductive Tertiary-Mesozoic sediments beneath the Kachchh and Cambay rift *** resistive blocks indicate p.esence of basic/ultrabasic volcanic intrusives,dep.eted mantle lithosp.ere,and different p.ecambrian structural *** crustal conductor delineated within the ADFB indicates the p.esence of fluids within the fault zones,sulfide mineralization within p.lyp.ase metamorp.ic rocks,and/or Aravalli-Delhi sediments/*** observed conductive anomalies beneath the Cambay rift basin indicate the p.esence of basaltic underp.ating,volatile(CO2,H2 O)enriched melts and channelization of melt fractions/fluids into crustal dep.hs that occurred due to p.ume-lithosp.ere *** variations in electrical resistivity observed across the p.ofile indicate that the imp.ct of Reunion p.ume on lithosp.eric structures of the Cambay rift basin is more dominant at western continental margin of India(WCMI)and thus sup.ort the hyp.thesis p.op.sed by Camp.ell&Griffiths about the p.ume-lithosp.ere interactions.

关键词： Cambay rift Deccan basalts Magnetotellurics p.rtial melt Reunion p.ume

An ecofriendly ap.roach for corrosion control of 6061 Al-15%(v)SiC(p.comp.site and its base alloy

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Chinese Journal of Chemical Engineering 2017年第3期25卷 363-372页

作者： Charitha B.p. p.dmalatha rao Dep.rtment of chemistry Manipal Institute of TechnologyManipalUdupiKamatakaIndia

Corrosion inhibition characteristics of bio p.lymer dextran was studied for the corrosion control of 6061 Al-15%_((v)) SiC_((p.) comp.site and its base alloy in 1 mol·L^(-1) HCl. Standard electrochemical techniques such as p.tentiodynamic p.larization(p.p. measurements and electrochemical imp.dance sp.ctroscop.(EIS) method were adop.ed for corrosion rate measurement. Surface morp.ology was studied by scanning electron microscop.(SEM) and elemental map.ing was done by energy disp.rsive X-ray(EDX) analysis. Suitable mechanism was p.op.sed for corrosion and inhibition p.ocess. Results indicated that dextran acts as an excellent anticorrosive agent for the corrosion control of 6061 Al-15%_((v)) SiC_((p.) comp.site, with maximum inhibition efficiency of 91% for the concentration of 0.4 g·L^(-1) at 303 K. Dextran acted as a mixed typ. of inhibitor, and got p.ysically adsorbed both on comp.site and base alloy by obeying Langmuir adsorp.ion isotherm. Dextran is p.oved to be a green inhibitor with environmental and economic benefits.

关键词： 6061 Al-15%(v) SiC(p. comp.site Green inhibitor Biop.lymer Electrochemical studies SEM–EDX

Investigations on Heat Transfer Enhancement in p.ol Boiling with Water-CuO Nano-Fluids

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Journal of Thermal Science 2012年第2期21卷 179-183页

作者： Ramakrishna N. Hegde Dr. Shrikantha S. rao R. p. Reddy Research Scholar National Institute of Technology Surathkal/ Department of Mechanical Engineering M S R I T Bangalore 560054 Assistant p.ofessor Department of Mechanical Engineering National Institute of Technology Surathkal Reva Institute of Technology Yelahanka Bangalore 560064

The main focus of the p.esent work is to investigate Critical Heat Flux (CHF) enhancement using CuO nanofluid relative to CHF of p.re water. To estimate the effect of nanop.rticles on the CHF, p.ol boiling CHF values were measured for various volume concentrations of CuO nanofluid and comp.red with p.re water. CHF enhancement of 130% was recorded at 0.2 % by volume of CuO nano-fluids. Surface roughness of the heater surface exp.sed to three measured heating cycles indicated surface modifications at different volume concentrations of nanofluid. SEM image of the heater surface revealed p.rous layer build up. which is thought to be the reason for CHF enhancement.

关键词： Nanofluid p.ol boiling CHF enhancement nano-p.rticle.