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Acta Geologica sinica(English Edition) 2014年第3期88卷 845-853页

作者： raju v.s.perumala Roland K.W.MERKLE National Geophysical Research Institute PO Box 724 Hyderabad India (Council of Scientific and Industrial Research) Department of Geology University of Pretoria

Hogbomite,a rare exotic mineral,is found to be associated with the vanadiferous-titaniferous （v-Ti） bearing magnetite bands at Bhakatarhalli,Nuggihaifi greenstone belt,western Dharwar Craton,*** report on a second occurrence of hogbomite from the Dharwar craton in Karnataka,which is the sixth documented occurrence of this mineral from *** evaluate the chemical characteristics of hogbomite and associated Fe-Ti-minerals in an attempt to identify its formation as a primary hydrothermal mineral in a metamorphosed magnetite *** report here the presence of hogbomite as a complex oxide of Fe,Mg,Al and Ti with accessory of Zn,v and *** studies suggest the （v-Ti） bearing magnetite （Mt） contain spinel,hogbomite,chlorite,martite,ilmenite （Ⅱ） and minor amounts of *** hogbomite displays euhedral to subhedral textures,and is up to 250 μm along the grain boundaries of magnetite and *** the samples studied,hogbomite is prismatic,irregular and elongated in *** genesis of hogbomite in veins between magnetite and ilmenite implies its precipitation from fluids without involving complicated *** models were proposed for the formation of hogbomite; however,the subject is still debatable.

关键词： Hogbomite western Dharwar craton vanadium magnetite EPMA India

New Data on the Mineralogy of Chromite from the Nuggihalli schist Belt,Western Dharwar Craton,Karnataka,India:Petrogenetic Implications

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Acta Geologica sinica(English Edition) 2011年第1期85卷 107-115页

作者： perumala v.s.raju Elapavalooru v.s.s.K.BABU Roland K.W.MERKLE National Geophysical Research Institute Hyderabad India(Council of Scientific and Industrial Research) Department of Geology University of Pretoria PretoriaSouth Africa

The occurrence of rhythmic layering of chromite and host serpentinites in the deformed layered igneous complexes has been noticed in the Nuggihalli schist belt （NsB） in the western Dharwar craton, Karnataka, south India. For this study, the chromitite rock samples were collected from Jambur, Tagadur, Bhakatarhalli, Ranganbetta and Byrapur in the NsB. Petrography and ore microscopic studies on chromite show intense cataclasis and alteration to ferritchromite. The ferritchromite compositions are characterized by higher Cr number （Cr/[Cr＋AI]）（0.68-0.98） and lower Mg number （Mg/[Mg＋Fe]）（0.33-0.82） ratios in ferritchromite compared to that of parent chromite. The formation process for the ferritchromite is thought to be related to the exchange of Mg, AI, Cr, and Fe between the chromite, surrounding silicates （serpentines, chlorites）, and fluid during serpentinization.

关键词： chromite ferritchromite Nuggihalli schist belt Dharwar Craton India

Effect of wall temperature modulation on the heat transfer characteristics of droplet-train flow inside a rectangular microchannel

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Chinese Journal of Chemical Engineering 2020年第3期28卷 685-697页

作者： vivekanand s.v.B.,raju v.R.K. Department of Mechanical Engineering National Institute of TechnologyWarangalTelangana 506004India

The numerical studies of water–oil two-phase slug flow inside a two-dimensional vertical microchannel subjected to modulated wall temperature boundary conditions have been discussed in the present *** researchers have contributed their efforts in exploring the characteristics of Taylor flows inside microchannel under constant wall heat flux or isothermal wall ***,there is no study available in the literature which discusses the impact of modulated thermal wall boundary conditions on the heat transfer behavior of slug flows inside ***,to bridge this gap,an effort has been made to understand the heat transfer characteristics of the flow under sinusoidal wall temperature ***,a single phase flow and heat transfer study was performed in microchannels,and the results of the fully developed velocity profile and heat transfer rate were validated with benchmark analytical *** an optimal selection of the combination of sinusoidal thermal wall boundary conditions has been made for the two-phase slug flow ***,the effects of amplitude(0 bεb 0.03)and frequency(0 bωb 750πrad·s-1)of the sinusoidal wall temperature profile on the heat transfer have been studied using the optimal combination of the wall boundary *** results of the numerical study using modulated temperature conditions on channel walls showed a significant improvement in the heat transfer over liquid-only flow by approximately 50%as well as over two-phase flow without wall temperature *** non-dimensional temperature contours obtained for different cases of temperature modulation clearly explain the root cause of such improvement in the heat ***,the results based on the hydrodynamics of the flow have also been reported in terms of variation of droplet shapes and film *** influence of Capillary number on the film thickness as well as heat transfer rates has also been *** addition,the measured fil

关键词： Heat transfer Microchannel Modulation surface tension Taylor flow

Neuroprotective role of protein tyrosine phosphatase-1B in rod photoreceptor neurons

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Protein & Cell 2013年第12期4卷 890-892页

作者： raju v.s.Rajala Ammaji Rajala Department of Ophthalmology University of Oklahoma Health Sciences CenterOklahoma CityOklahoma 73104USA Department of Physiology University of Oklahoma Health Sciences CenterOklahoma CityOklahoma 73104USA Department of Cell Biology University of Oklahoma Health Sciences CenterOklahoma CityOklahoma 73104USA Dean A.McGee Eye Institute Oklahoma CityOklahoma 73104USA

Dear Editor,Protein tyrosine phosphatase-1B(PT-P1B)is an abundant,widely expressed non-receptor tyrosine phosphatase,which is thought to be a key negative regulator of insulin signaling(Tonks,2003).Increased and prolo... 详细信息

关键词： PTP1B insulin of

Design of a robust PID-Pss for an uncertain power system with simplified stability conditions

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Protection and Control of Modern Power systems 2020年第1期5卷 222-237页

作者： vijaya Lakshmi A.s.v Ramalinga raju Manyala siva Kumar Mangipudi Department of EEE G.V.P College of Engineering for WomenVisakhapatnamIndia Department of EEE JNTU KakinadaKakinadaIndia Department of EEE Gudlavalleru Engineering CollegeGudlavalleruAndhra PradeshIndia

In a deregulated power system uncertainty exists and lack of sufficient damping can lead to Low FrequencyOscillations (LFO). The problem can be addressed using robust Power system stabilizers (Pss). In this paper, anoptimal procedure to design a robust PID-Pss using interval arithmetic for the single Machine Infinite Bus (sMIB)power system is proposed. The interval modelling captures the wide variations of operating conditions in boundsof system coefficients. In the proposed design procedure, simple and new closed loop stability conditions for ansMIB interval system are developed and are used to design an optimum PID-Pss for improving the performance ofan sMIB system. The optimum PID-Pss is attained by tuning the parameters using the FMINCON tool provided inMATLAB. The robustness of the proposed PID-Pss design is validated and compared to other notable methods inthe literature when the system is subjected to different uncertainties. The simulation results and performance errorvalues show the effectiveness of the proposed robust PID-Pss controller.

关键词： Low frequency oscillations Uncertainty Power system stabilizer Robust controller Interval systems

Conservation and divergence of Grb7 family of Ras-binding domains

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Protein & Cell 2012年第1期3卷 60-70页

作者： raju v.s.Rajala Ammaji Rajala vivek K.Gupta Department of Ophthalmology University of Oklahoma Health Sciences CenterOklahoma CityOK 73104USA Department of Cell Biology University of Oklahoma Health Sciences CenterOklahoma CityOK 73104USA Dean A.McGee Eye Institute Oklahoma CityOK 73104USA

Ras proteins are signal-transducing GTPases that cycle between inactive GDP-bound and active GTP-bound *** is a prolific signaling molecule interacting with a spectrum of effector molecules and acting through more than one signaling *** Ras-effector proteins contain a Ras-associating(RA)domain through which these associate with Ras in a GTP-dependent *** RA domain is highly conserved among the members of the growth factor receptor-bound(Grb)7 family of proteins which includes Grb7,Grb10 and *** laboratory has reported an unusual observation that RA domain of Grb14 binds to the C-terminal nucleotide binding site of cyclic nucleotide gated channel(CTRCNGA1)and inhibits the channel *** modeling of the CTR-CNGA1 displays 50%---70%tertiary structural similarity towards Ras *** named this region as Ras-like domain(RLD).The interaction between RA-Grb14 and RLD-CNGA1 is mediated through a simple protein-protein interaction temporally and spatially regulated by light and *** is interesting to note that Grb14 binds to GTPase-mutant Rab5,a Ras-related small GTPase whereas Grb10 binds only to GTP-bound form of active Rab5 but not to GTPase-defective mutant *** results suggest that Grb14 might have been evolved later in the evolution that binds to both Ras and nucleotide binding proteins such as *** studies also suggest that eukaryotic CNG channels could be evolved through a gene fusion between prokaryotic ion channels and cyclic nucleotide binding proteins,both of which might have undergone several sequence variations for functional adaptation during evolution.

关键词： growth factor receptor-bound protein 14 Ras-associating domain cyclic nucleotide gated channel rod outer segments tyrosine kinase signaling Ras proteins

3D Casson nanofluid flow over slendering surface in a suspension of gyrotactic microorganisms with Cattaneo-Christov heat flux

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Applied Mathematics and Mechanics(English Edition) 2018年第5期39卷 623-638页

作者： v.NAGENDRAMMA C.s.K.raju B.MALLIKARJUNA s.A.sHEHZAD A.LEELARATHNAM Department of Mathematics SPMVV University Department of Mathematics GITAM University Department of Mathematics BMS College of Engineering Department of Mathematics COMSATS Institute of Information Technology

A mathematical model is proposed to execute the features of the non-uniform heat source or sink in the chemically reacting magnetohydrodynamic （MHD） Casson fluid across a slendering sheet in the presence of microorganisms and Cattaneo-Christov heat flux. Multiple slips （diffusion, thermal, and momentum slips） are applied in the modeling of the heat and mass transport processes. The Runge-Kutta based shooting method is used to find the solutions. Numerical simulation is carried out for various values of the physical constraints when the Casson index parameter is positive, negative, or infinite with the aid of plots. The coefficients of the skin factors, the local Nusselt number, and the sherwood number are estimated for different parameters, and discussed for engineering interest. It is found that the gyrotactic microorganisms are greatly encouraged when the dimensionless parameters increase, especially when the Casson fluid parameter is negative. It is worth mentioning that th~ velocity profiles when the Casson fluid parameter is positive are higher than those when the Casson fluid parameter is negative or infinite, whereas the temperature and concentration fields show exactly opposite phenomena.

关键词： microorganisms multiple slip Casson fluid Cattaneo-Christov heat flux,slendering sheet

Higher-Order Compact scheme for the Incompressible Navier-stokes Equations in spherical Geometry

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Communications in Computational Physics 2012年第1期11卷 99-113页

作者： T.v.s.sekhar B.Hema sundar raju Y.v.s.s.sanyasiraju Department of Mathematics Pondicherry Engineering CollegePuducherry-605014India Department of Mathematics Indian Institute of TechnologyMadrasChennai-600036India

A higher-order compact scheme on the nine point 2-D stencil is developed for the steady stream-function vorticity form of the incompressible Navier-stokes(Ns)equations in spherical polar coordinates,which was used earlier only for the cartesian and cylindrical *** steady,incompressible,viscous and axially symmetric flow past a sphere is used as a model *** non-linearity in the N-s equations is handled in a comprehensive manner avoiding complications in *** scheme is combined with the multigrid method to enhance the convergence *** solutions are obtained over a non-uniform grid generated using the transformation r=ex while maintaining a uniform grid in the computational *** superiority of the higher order compact scheme is clearly illustrated in comparison with upwind scheme and defect correction technique at high Reynolds numbers by taking a large *** is a pioneering effort,because for the first time,the fourth order accurate solutions for the problem of viscous flow past a sphere are presented *** drag coefficient and surface pressures are calculated and compared with available experimental and theoretical *** is observed that these values simulated over coarser grids using the present scheme aremore accuratewhen compared to other conventional *** has also been observed that the flow separation initially occurred at Re=21.

关键词： Fourth order compact scheme Navier-stokes equations spherical polar coordinates drag coefficient.

Thermo-diffusion impact on immiscible flow characteristics of convectively heated vertical two-layered Baffle saturated porous channels in a suspension of nanoparticles:an analytical study

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Applied Mathematics and Mechanics(English Edition) 2023年第2期44卷 307-324页

作者： s.P.v.ANANTH B.N.HANUMAGOWDA s.v.K.vARMA C.s.K.raju I.KHAN P.RANA Department of Mathematics School of Applied SciencesREVA UniversityBangalore 560064India Department of Mathematics GITAM School of ScienceGITAM UniversityBangalore 562163India Department of Mathematics College of Science Al-ZulfiMajmaah UniversityAl-Majmaah 11952Saudi Arabia school of Mathematical sciences College of Science and TechnologyWenzhou-Kean UniversityWenzhou 325060Zhejiang ProvinceChina

The heat and mass transfer of two immiscible fluids in an inclined channel with thermal diffusion,vicious,and Darcy dissipation is *** first region consists of a clear fluid,and the second one is filled with a nanofluid saturated with a porous *** behaviors of Cu-H_(2)O,In-H_(2)O,and Au-H_(2)O nanofluids are *** transport properties are assumed to be *** coupled non-linear equations of the flow model are transformed into the dimensionless form,and the solutions for the velocity,temperature,and concentration are obtained by the regular perturbation *** are carried out on the flow characteristics for various values of the material *** results show that the velocity and temperature of the fluids enhance with the thermal Grashof number,solutal Grashof number,and Brinkman number while decrease with the porosity parameter and solid volume fraction.

关键词： viscous fluid nanofluid heat and mass transfer thermal diffusion

Floral extract of Tecoma stans:A potent inhibitor of gentamicin-induced nephrotoxicity in vivo

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Asian Pacific Journal of Tropical Medicine 2011年第9期4卷 680-685页

作者： raju s Kavimani s Uma Maheshwara rao v sreeramulu Reddy K vasanth Kumar G vijaya College of Pharmacy MunaganoorRanga Reddy DistAndhra PradeshIndia-505511 Mather Theresa Post Graduate Institute of Health sciences.Gorimedu PuducherryIndia Nulla Narsimha Reddy College of Pharmacy KorremulaRanga Reddy DistAndhra Pradesh.India Assistant manager - Clinical R&D Shantha Biotechnics LimitedHyderabadAndhra Pradesh.India -500004 Health Management and Research Institute HyderabadAndhra PradeshIndia

Objective:To highlight the nephroprotective activity of ethyl acetate extract of dried flowers of Tecomu stans for its protective effects on genlamicin-induced nephrotoxicity in albino rats. Methods:For studying acute toxicity study,single oral dose of 5（KM） mg ethyl acetate floral extract/kg hodv weight was administered to albino rats（five females,five males）.Nephrotoxicity was induced in albino rats by intraperitoneal administration of gentamicin 80 mg/kg/day for eight *** of concurrent administration of ethyl acetate floral extract of Tecoma stans at a dose of 100.200 and 300 mg/kg/day given by oral mute was determined using serum creatinine,serum uric acid,blood urea nitrogen and serum urea as indicators of kidney *** study groups contained six rats in each *** nephrotoxicity of gentamicin is known to involve induction of oxidative stress,in vitro antioxidant aclivity and free radical-scavenging activity of this extract was also ***:For acute toxicity testing both female and male rats administered with the extract at a dose of 5 000 mg/*** results showed no toxicity in terms of general behavior change,mortality,or change in gross appearance of internal organs(LDsub>50sub>>5 000 mg/kg). It was observed that the ethyl acetate floral extract of Tecoma stans significantly protected rat kidneys from gentamicin-induced histopathological ***-induced glomerular congestion,peritubular and blood vessel congestion,epithelial desquamation,accumulation ol inflamnialoiy cells and necrosis of the kidney cells were found to be reduced in the groups receiving the ethyl acetate floral extract of Tecoma starts along with gentamicin in a dose dependent *** floral extract also reduced the gentamicin-induced increase in serum creatinine,serum uric acid,blood urea nitrogen and serum urea levels（P>0.01）.Conclusions: The present study indicates a verv important role of reactive oxygen species（BOs） and the relation to re

关键词： Gentamicin Tecoma stans Rats Nephrotoxicity serum urea Creatinine