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Electron Param.gnetic Resonance and Optical Absorption Studies on Copper Ions in m.xed Alkali Cadm.um.Phosphate Glasses

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Journal of m.terials Science & Technology 2009年第4期25卷 531-534页

作者： G. Giridhar m. Rangacharyulu R.V.S.S.N. Ravikum.r P. sambasiva rao Departm.nt of Physics Acharya Nagarjuna University Departm.nt of Chem.stry Pondicherry University

Electron param.gnetic resonance （EPR） and optical absorption studies were carried out at room.tem.erature on copper doped m.xed alkali cadm.um.phosphate （LiNaCdP） glasses to understand the nature and sym.etry of dopant. Three sam.les with varying concentrations of alkali ions have been prepared. The spin Harniltonian param.ters obtained from.room.tem.erature EPR spectra are： gli=2.437, 9⊥=2.096, A‖=117×10-4 cm.1, A⊥=26×10-4 cm.1 for LiNaCdP1, g‖=2.441, g⊥=2.088, A‖=121×10-4 cm.1, A⊥=25×10-4 cm.1 for LiNaCdP2and g‖=2.433,g⊥=2.096, A‖=125×10 4cm.1, A⊥=32×10-4cm.1 for LiNaCdP3. TheseEPR results indicate that the dopant Cu2＋ ion enters the glass m.trix into a tetragonally elongated octahedral site. The bonding param.ters evaluated by correlating optical and EPR data suggest that bonding between the central m.tal ion and ligands is partially covalent. The m.xed alkali effect in cadm.um.phosphate glasses was reported.

关键词： Glasses Electron param.gnetic resonance (EPR) Optical properties

Im.act of com.unication tim. delays on com.ined LFC and AVR of a m.lti-area hybrid system.with IPFC-RFBs coordinated control strategy

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Protection and Control of m.dern Power System. 2021年第1期6卷 89-108页

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

In this paper,the im.act of com.unication tim. delays(CTDs)on com.ined load frequency control(LFC)and autom.tic voltage regulation(AVR)of a m.lti-area system.with hybrid generation units is *** reveals that CTDs have significant effect on system.perform.nce.A classical PID controller is em.loyed as a secondary regulator and its param.tric gains are optim.zed with a differential evolution-artificial electric field algorithm.DE-AEFA).The superior perform.nce of the presented algorithm.is established by com.aring with various optim.zation algorithm. reported in the *** investigation is further extended to integration of redox flow batteries(RFBs)and interline power flow controller(IPFC)with *** reveals that IPFC and RFBs coordinated control enhances system.dynam.c ***,the robustness of the proposed control m.thodology is validated by sensitivity analysis during wide variations of system.param.ters and load.

关键词： Com.ined LFC-AVR Com.unication tim. delays(CTDs) IPFC-RFBs strategy DE-AEFA algorithm

Friction stir surfacing of cast A356 alum.nium.silicon alloy with boron carbide and m.lybdenum.disulphide powders

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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.m.DHUSUDHAN REDDY K.SRINIVASA rao Departm.nt of m.tallurgical Engineering Andhra University Defence m.tallurgical Research Laboratory

Good castability and high strength properties of Ale Si alloys are useful in defence applications like torpedoes,m.nufacture of m.ssile bodies,and parts of autom.bile such as engine cylinders and *** wear resistance of the alloys is m.jor lim.tation for their *** stir processing(FSP) is a recognized surfacing technique as it overcom.s the problem. of fusion route surface m.dification *** in view of the requirem.nt of im.roving wear resistance of cast alum.nium.silicon alloy,friction stir processing was attem.ted for surface m.dification with boron carbide(B4C) and m.lybdenum.disulfide(m. S2) ***,m.cro com.ositional analysis,hardness and pin-on-disc wear testing were used for characterizing the surface com.osite *** study revealed breaking of coarse silicon needles and uniform.y distributed carbides in the A356 alloy m.trix after *** and uniform.ty in hardness was obtained in surface com.osite *** wear resistance was achieved in friction stir processed coating with carbide *** of solid lubricant m. S2 powder was found to im.rove wear resistance of the base m.tal 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

Evaluation of in-vitro antibacterial activity and anti-inflam.atory activity for different extracts of Rauvolfia tetraphylla *** bark

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Asian Pacific Journal of Tropical Biom.dicine 2012年第10期2卷 818-821页

作者： B.Ganga rao P.Um.m.heswara rao E.sambasiva rao T.m.llikarjuna rao V.S.Praneeth.D A.U College of Pharm.ceutical Sciences Andhra UniversityVisakhapatnamA.P

Objective:To assess the in-vitro antihacterial activity and anti-inflam.atory activity of orally adm.nistered different extracts(Hydro-alcoholic,m.thanolic,ethyl acetate and hexane)of Rauvolfia tetraphylla(***)root bark in Carrageetiaii induced acute inflam.ation in ***:In-vitro antibacterial activity was evaluated for extracts against four Gram.positive and four Gram.negative bacteria by using cylinder plate ***-alcoholic extract(70%v/v ethanol)at 200,400 and 800 m./kg doses and m.thanolic,ethyl acetate and hexane extracts at doses 100,200 and 400 m./kg were tested for anti-inflam.atory activity in Carrageenan induced rat paw oedem. m.del and paw thickness was m.asured every one hour up to 6 ***:All extracts of *** root bark showed good zone of inhibition against tested bacterial *** Carrageenan induced inflam.ation m.del,hydro-alcoholic and m.thanolic extract of *** root bark at three different doses produced significant(Pm.ared to vehicle treated control group and hexane,ethyl acetate ***:In the present study extracts of *** root bark shows good in-vitro antibacterial activity and in-vivo anti-inflam.atory activity in rats.

关键词： Rauvolfia tetraphylla Root bark In-vitro antibacterial activity Inflam.ation Anti-inflam.atory activity

Copper interactions with DNA of chrom.tin and its role in neurodegenerative disorders

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Journal of Pharm.ceutical Analysis 2013年第5期3卷 354-359页

作者： m.Govindaraju H.S.Shekar S.B.Sateesha P.Vasudeva Raju K.R.sambasiva rao K.S.J.rao A.J.Rajam.a m.lecular Biophysics Unit Indian Institute of Science Departm.nt of Pharm.cy Practice KIMS Hospital and Research CenterVIPS Departm.nt of Pharm.ceutics Acharya & B.M.Reddy College of Pharmacy Departm.nt of Neuroscience Medical University of South Carolina Departm.nt of Biotechnology Acharya Nagarjuna University Centre for Neuroscience Institute for Scientifc Research and Technological services INDICASAT-AIP Departm.nt of Pharm.cognosy KLEU's College of Pharmacy

In this study, we have dem.nstrated the conform.tional changes to DNA induced by abnorm.l interactions of copper using circular dichroism. in com.ination with UV-absorbance and fluorescence spectroscopy. Results confirm.that binding of copper to bases of DNA in chrom.tin is concentration dependent. Binding efficiency of Cu2~ ions to DNA is increased in proportion to the degree of unwinding of the double helix induced by denaturation. Altered B-DNA conform.tion will alter the integrity of DNA which m.y affect the norm.l process of DNA replication and transcription. Copper induced DNA dam.ge in the brain m.y cause neurotoxicity and the neuronal cell death and is im.licated in Alzheim.r＇s disease and other neurological disorders.

关键词： Hum.n brain Chrom.tin DNA Copper Neurodegenerative disorders

Therm.lum.nescence study of rare earth ion (Dy^(3+)) doped LiF:m. crystals grown by EFG technique

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Journal of Rare Earths 2012年第7期30卷 641-646页

作者： Pooja Seth Shruti Aggarwal S m.rao University School of Basic and Applied Science Guru Gobind Singh Indraprastha University Departm.nt of Physics Punjabi University

This work describes investigation of radiation dosim.try characteristics of m.gnesium.（m.） doped lithium.fluoride （LiF） crystals co-doped with different concentrations of dysprosium.（Dy）. These crystals were grown by edge defined film.fed crystal growth （EFG） tech- nique. Therm.lum.nescence （TL） m.asurem.nts were m.de on as grown （AG） and annealed （AN） crystals after they were irradiated with a gam.a dose of 15 Gy. The influence and advantage of optim.zed Dy^3＋ concentration in enhancing the therm.lum.nescence （TL） properties of LiF：m. sam.les were discussed. The norm.lized peak height of the annealed crystals was nearly 3 tim.s that of the as grown crystals for the particular concentration sam.les irradiated with Co6~ gam.a source showed linearity up to 10 Gy. Therm.lum.nescence signal observed over a period of one m.nth showed negligible fading. Therm.lum.nescence glow curve structure of optim.zed phosphor rem.ined stable for higher doses of gam.a rays of 103 Gy. Glow curve was analyzed using com.uter glow curve deconvolution （CGCD） m.thod and trapping param.- ters were calculated.

关键词： therm.lum.nescenea rare earth ions annealing edge defined film.fed growth technique

Phase-transition-free rivets for layered oxide potassium.cathodes

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Nano Research 2024年第11期17卷 9671-9678页

作者： Jie Chen Apparao m. rao Caitian Gao Jiang Zhou Lim.i Cha Xiaom.ng Yuan Bingan Lu School of Physics and Electronics Hunan University Changsha 410082 China Departm.nt of Physics and Astronom. Clemson Nanomaterials Institute Clemson University Clemson SC USA School of m.terials Science and Engineering Central South University Changsha 410083 China m.terials Science and Engineering program Guangdong Technion-Israel Institute of Technology Shantou 515063 China m.terials Science and Engineering program Technion-Israel Institute of Technology Haifa 32000 Israel m.TEC Key Lab Guangdong Technion-Israel Institute of Technology Shantou 515063 China Hunan Key Laboratory of Nanophotonics and Devices School of Physics Central South University Changsha 410078 China

As a cathode m.terial for potassium.ion batteries (PIBs), m.nganese-based layered oxides have attracted widespread attention due to their low cost, ease of synthesis, and high perform.nce. However, the Jahn-Teller effect caused by m.3+ and the irreversible phase transform.tion of the structure leads to poor cycle stability, lim.ting the developm.nt of layered oxides in PIBs. Herein, we dem.nstrate the use of phase-transition-free CaTiO_(3) as rivets in K_(0.5)m._(0.9)Ti_(0.1)O_(2) by a sim.le solid-state m.thod. As verified by the in situ X-ray diffraction, the CaTiO_(3) rivets effectively prevent the slippage of the transition m.tal layer during charge and discharge, inhibiting structural degradation. As a result, the obtained K_(0.5)m._(0.9)Ti_(0.1)O_(2)-0.02CaTiO_(3) shows excellent cycling stability and rate perform.nce, with high capacities of 119.3 and 70.1 m.h·g^(-1) at 20 and 1000 m.·g^(-1), respectively. At 200 m.·g^(-1), the capacity retention rem.ins 94.7% after m.re than 300 cycles. This work represents a new avenue for designing and optim.zing layered cathode m.terials for PIBs and other batteries.

关键词： potassium.cathodes layered oxide phase-transition-free perovskite rivets

Im.roved Routing Protocol for Health Care Com.unications

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Open Journal of Applied Biosensor 2013年第2期2卷 51-56页

作者： Jayanthi K. m.rthy V. sambasiva rao Departm.nt of Electronics and Com.unication B.M.S College of Engineering Bengaluru India Departm.nt of Electronics and Com.unication P.E.S Institute of Technology Bengaluru India

Wireless Body Area Network (WBAN) technology has significantly increased the potential of rem.te healthcare m.nitoring system.. The devices used for WBAN have lim.ted energy resources. For m.st devices it is im.ossible to recharge or change the batteries. Since the data m.stly consists of m.dical inform.tion, high reliability and low delay is required. The m.in objective of this sim.lation study is to evaluate the perform.nce of routing protocol on static IEEE 802.15.4 to determ.ne the m.st suitable routing protocol for Wireless Body Area Networks. Here, investigations on the various routing protocol suggest cluster topology and AODV as the probable candidate. About 16% im.rovem.nt in the energy consum.tion was observed when m.difications were m.de considering the energy and m.bility, thus achieving high residual battery capacity and elim.nating the need for recharging the batteries.

关键词： Wireless Body Area Network ZigBee Networks Routing Protocol

m.lecular characterization of DnaJ 5 hom.logs in silkworm.Bom.yx m.ri and its expression during egg diapause

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Insect Science 2014年第6期21卷 677-686页

作者： Sasibhushan Sirigineedi Esvaran Vijayagowri Geetha N. m.rthy Guruprasada rao Kangayam.m. Ponnuvel Genom.cs Division Seribiotech Research Laboratory Carmelaram Post Kodathi Bangalore 560035 Karnataka India

A com.arison of the cDNA sequences （1 056 bp） of Bom.yx m.ri DnaJ 5 hom.log with B. m.ri genom. revealed that unlike in other Hsps, it has an intron of 234 bp. The DnaJ 5 hom.log contains 351 am.no acids, of which 70 contain the conserved DnaJ dom.in at the N-term.nal end. This hom.log orB. m.ri has all desirable functional dom.ins sim.lar to other insects, and the 13 different DnaJ hom.logs identified in B. m.ri genom. were distributed on different chrom.som.s. The expressed sequence tag database analysis of Hsp40 gene expression revealed higher expression in wing disc followed by diapause-induced eggs. m.croarray analysis revealed higher expression of DnaJ 5 hom.log at 18th h after oviposition in diapause-induced eggs. Further validation of DnaJ 5 expression through qPCR in diapause-induced and nondiapause eggs at different tim. intervals revealed higher expression in diapause eggs at 18 and 24 h after oviposition, which coincided with the expression of Hsp70 as the Hsp 40 is its co-chaperone. This study thus provides an outline of the genom. organization of lisp40 gene, and its role in egg diapause induction in B. m.ri.

关键词： Bom.yx m.ri diapause DnaJ exon Hsp40 intron