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Journal of Central South University 2019年第5期26卷 1116-1132页

作者： Hanumesh VAIDYA rajashekhar choudhari Manjunatha GUDEKOTE Kerehalli Vinayaka PRASAD Department of Mathematics SSA Government First Grade College (Autonomous)BallariKarnataka583101India Department of Mathematics Manipal Institute of TechnologyManipal Academy of Higher EducationManipalKarnataka576104India Department of Mathematics Vijayanagara Srikrishnadevaraya UniversityBallariKarnataka583105India

The present paper emphasizes the peristaltic mechanism of Rabinowitsch liquid in a complaint porous channel under the influence of variable liquid properties and convective heat *** effect of inclination on the complaint channel walls has been taken into *** viscosity of the liquid varies across the thickness of the complaint channel,whereas,thermal conductivity varies concerning *** nonlinear governing equations are solved by using perturbation technique under the long wavelength and small Reynold’s number *** expressions for axial velocity,temperature,the coefficient of heat transfer and streamlines are obtained and analyzed *** above said physiological phenomena are investigated for a specific set of relevant parameters on dilatant,Newtonian and pseudoplastic fluid *** results presented here shows that the presence of variable viscosity,porous parameter and slip parameter significantly affects the flow quantities of dilatant,Newtonian and pseudoplastic fluid *** investigation further reveals that an increase in the value of variable viscosity and porous parameters enhances the occurrence of trapping ***,the size of trapped bolus can be eliminated with suitably adjusting the angle of inclination parameter.

关键词： Rabinowitsch liquid Biot number porous parameter thermal conductivity variable viscosity velocity slip

Sm^(3+)induced structural phase transition,spectral,morphological,magnetic,dielectric and impedance properties of Ni_(0.1)Cu_(0.9)Sm_(x)Fe_(2-x)O_(4) nanoferrites

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Journal of Rare Earths 2023年第11期41卷 1736-1745,I0003页

作者： K.rajashekhar G.Vinod K.Mahesh Kumar G.Harikishan Laxman Naik J Department of Physics University College of ScienceOsmania UniversityHyderabad500007TelanganaIndia Department of Physics Kamala Institute of Technology and ScienceHuzurabad505468TelanganaIndia Department of Physics CMR College of Engineering&TechnologyHyderabad501401TelanganaIndia

In the present study,rare earth samarium(Sm^(3+))substituted Ni-Cu spinel ferrites with the composition of Ni_(0.1)Cu_(0.9)Sm_(x)Fe_(2-x)O_(4)(0≤x≤0.05 in steps of 0.01)were synthesized by using the citrate induced sol-gel auto combustion *** ferrites'structural,optical,magnetic,and dielectric studies were carried out using X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FTIR),field emission scanning electron microscopy(FESEM),ultraviolet-visible(UV-vis),a vibrational sample magnetometer(VSM),and an LCR *** pure Ni-Cu ferrite exhibits a tetragonal structure owing to the presence of the John Tellar ion(Cu^(2+)).XRD patterns confirm that the tetragonal structure gradually transforms into the cubic spinel structure with samarium *** nano-scale structures of these ferrites were confirmed by the average crystallite size(10.11-20.99 nm)derived from the X-ray diffraction patterns,and grain size(42.60-83.36 nm)assessed from FESEM *** existence of elements according to their chemical composition was verified by using energy dispersive X-ray(EDX)*** absorption bands(v_(1) and v_(2))detected in FTIR transmission spectra below the wavenumber of 600 cm^(-1)reveal the stretching vibrations of M-O bonds in the spinel structure at tetrahedral and octahedral *** band gap ene rgy obtained from UV absorption reveals the semiconducting nature of the *** high saturation magnetization(M_(s))is noticed at 15 K temperature for x=0.02 composition as 32.98 emu/g,while at 300 K for x=0.01composition as 27.61 emu/*** suggested cation distribution is in good agreement with observed and predicted magnetic moment values at 300 *** expected behavior of ferrites reveals the observed dielectric constant,loss tangent,and ac-conductivity values in the frequency range of 20 Hz-20 ***-Cole plots confirm that the impedance contribution is attributed to grain boundaries.

关键词： Nanoferrites XRD Magnetic properties Dielectric properties Cole-cole plots Rare earths

Slip flow of MHD Casson fluid in an inclined channel with variable transport properties

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Communications in Theoretical Physics 2020年第9期72卷 21-38页

作者： K V Prasad Hanumesh Vaidya C rajashekhar Sami Ullah Khan G Manjunatha J U Viharika Department of Mathematics Vijayanagara Sri Krishnadevaraya UniversityVinayaka NagarBallari-583105KarnatakaIndia Bhaskaracharya Study Chair Karnataka State Akkamahadevi Women's UniversityVijayapuraKarnatakaIndia Department of Mathematics COMSTAS University IslamabadSahiwal Campus 54000Pakistan Department of Mathematics Manipal Institute of TechnologyManipal Academy of Higher EducationManipalKarnataka576104-India

Due to the instructive role of the peristaltic phenomenon in the human body, interests have been developed in recent years towards peristaltic transport with various thermo-physical *** current investigation reveals the effects of the magnetic field and variable transport properties on the peristaltic transport of a Casson fluid slip flow through an inclined *** coupled partial differential equations regulate the fluid flow. Through the perturbation method, the momentum and energy equations are solved for small values of variable viscosity and thermal conductivity, and the closed-form solution is obtained for mass transfer. The impact on physiological quantities of related parameters of interest is evaluated and discussed via graphs. The results obtained for the current flow represent some interesting behaviors which have applications in the biomedical field.

关键词： velocity slip thermal slip concentration slip variable viscosity yield stress

EDXRF analysis of beach rock samples of Andaman Island

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Nuclear Science and Techniques 2009年第2期20卷 93-98页

作者： Ravisankar R Eswaran P Vijay Anand K Rajalakshmi A Prasad MVR Satpathy K K rajashekhar C Alok Athavale Department of Physics Sri Sivasubramania Nadar College of Engineering Department of Physics SMK Fomra Institute of Technology Environmental and Industrial Safety Section Safety GroupIndira Gandhi Centre for Atomic Research Paleobiology Group Agharkar Research Institute

B Elemental contents of beach rock samples were analyzed using *** samples were collected from three locations of Andaman *** Al,Ca,K,Fe,Ti,Si,V,Co,Cu,Ba,Zn,Pb,Cd and Mn contents were *** geochemical behavior of elements in the region is *** elemental contents of beach rock samples from Andaman Island are much below the values of both earth crust and that of Tamilnadu ***,content of the biogenic element Ca was the highest of all *** is due to the typical beach rock formation.

关键词：能量色散X射线荧光分析岩石样本海滩地球化学行为元素含量生物元素锰含量样品

Phytochemical screening of twelve species of phytoplankton isolated from Arabian Sea coast

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Journal of Coastal Life Medicine 2015年第11期 857-863页

作者： Sushanth Vishwanath Rai Madaiah rajashekhar Department of Biosciences Mangalore UniversityMangalagangothri-574199KarnatakaIndia

Objective:To analyze the phytochemicals in twelve species of marine ***:Total phenolic content of methanol extract was estimated by the Folin-Ciocalteu *** flavonoid content of the methanol extarct was determined by aluminium chloride ***,β-carotene and astaxanthin were estimated by acetone extraction *** C was determined by dinitrophenyl-hydrazine *** such as allophycocyanin,phycocyanin and phycoerythrin in the aqueous extracts were ***:Total phenolics varied from 5.41 mg gallic acid equivalents/g dry weight(DW)in Phormidium corium(***)to 17.37 mg gallic acid equivalents/g DW in Oscillatoria fremyii(***).Total flavonoids ranged between 0.74 mg quercetin equivalent/g DW in *** and 9.87 mg quercetin equivalent/g DW in Nannochloropsis ***-a pigment was high in Chaetoceros calcitrans(***)(15.51 mg/g DW)and low in ***(1.08 mg/g DW).Chlorophyll-c ranged between 0.07 mg/g DW in Nannochloropsis oceanica and 4.62 mg/g DW in *** contents ofβ-carotene and astaxanthin were found in *** and low in *** which ranged from 0.33 to 10.03 mg/g DW and 0.18 to 3.85 mg/g DW,*** C content varied from 0.50 mg/g DW in *** to 1.51 mg/g DW in Phormidium *** showed highest total phycobiliproteins of 317.05 mg/g *** contents of allophycocyanin and phycocyanin were found in ***,whereas high contents of phycoerythrin were found in Oscillatoria *** the three phycobiliproteins were low in Chroococcus ***:Marine phytoplankton are one of the natural sources providing novel biologically active compounds with potential for pharmaceutical applications.

关键词： Marine phytoplankton Phytochemical constituents Phenolics Pigments Phycobiliproteins

Grain to outcrop-scale frozen moments of dynamic magma mixing in the syenite magma chamber,Yelagiri Alkaline Complex,South India

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Geoscience Frontiers 2014年第6期5卷 801-820页

作者： M.L.Renjith S.N.Charan D.V.Subbarao E.V.S.S.K.Babu V.B.rajashekhar Marine and Coastal Survey Division Geological Survey of IndiaCochin 682037India Geochemistry Division CSIR-National Geophysical Research InstituteHyderabad 500007India New Zealand Petroleum and Minerals Wellington 6037New Zealand

Magma mixing process is unusual in the petrogenesis of felsic rocks associated with alkaline complex worldwide. Here we present a rare example of magma mixing in syenite from the Yelagiri Alkaline Complex, South India. Yelagiri syenite is a reversely zoned massif with shoshonitic (Na2O t K2O?5e 10 wt.%, Na2O/K2O ? 0.5e2, TiO2<0.7 wt.%) and metaluminous character. Systematic modal variation of plagioclase (An11e16 Ab82e88), K-feldspar (Or27e95 Ab5e61), diopside (En34e40Fs11e18Wo46e49), biotite, and Ca-amphibole (edenite) build up three syenite facies within it and imply the role of in-situ fractional crystallization (FC). Evidences such as (1) disequilibrium micro-textures in feldspars, (2) microgranular mafic enclaves (MME) and (3) synplutonic dykes signify mixing of shoshonitic mafic magma (MgO ? 4e 5 wt.%, SiO2 ? 54e59 wt.%, K2O/Na2O ? 0.4e0.9) with syenite. Molecular-scale mixing of mafic magma resulted disequilibrium growth of feldspars in syenite. Physical entity of mafic magma preserved as MME due to high thermal-rheological contrast with syenite magma show various hybridization through chemical exchange, mechanical dilution enhanced by chaotic advection and phenocryst migration. In synplutonic dykes, disaggregation and mixing of mafic magma was confined within the conduit of injec-tion. Major-oxides mass balance test quantified that approximately 0.6 portions of mafic magma had interacted with most evolved syenite magma and generated most hybridized MME and dyke samples. It is unique that all the rock types (syenite, MME and synplutonic dykes) share similar shoshonitic and met-aluminous character;mineral chemistry, REE content, coherent geochemical variation in Harker diagram suggest that mixing of magma between similar composition. Outcrop-scale features of crystal accumu-lation and flow fabrics also significant along with MME and synplutonic dykes in syenite suggesting that Yelagiri syenite magma chamber had evolved through multiple physical processes like

关键词： Magma mixing Disequilibrium textures Petrology Synplutonic dykes Geodynamics

Development, and validation of non-speech dichotic listening test

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Journal of Otology 2023年第1期18卷 63-69页

作者： Hari Prakash Palaniswamy Mayur Bhat Rajashree Ganesh Bhat Y.Krishna B.rajashekhar Dept of Speech and Hearing Manipal College of Health Professions Manipal Academy of Higher EducationManipalIndia Dept of Audiology and Speech Language Pathology Kasturba Medical CollegeMangaloreManipal Academy of Higher EducationManipalIndia Speech and Hearing Unit College of Applied Medical ScienceKing Khalid UniversityAbha62529Saudi Arabia

Background:Classic dichotic listening tests using speech stimuli result in right ear advantage,due to the dominant crossed pathway for speech and *** is presumed that similar crossed dominance could exist for non-speech stimuli ***,this is an attempt to develop and validate the dichotic nonspeech test using environmental stimuli and explore the effect of focused attention on this *** and method:Three lists of dichotic stimuli were created using these sounds with fifteen tokens in each *** professionals and non-professionals validated these *** estimation was obtained by administering the newly developed test on 70 adults and 70 children using a free-recall and forced-recall ***:The results showed a significant difference between the left ear and right scores where the left ear score was better than the right,depicting left ear advantage(LEA)for free recall condition in both *** the forced recall condition,LEA was not seen;rather the mean score was significantly higher in the attended ear,irrespective of the stimuli presented to the right or left *** test-retest reliability in free recall was good in both the ears and moderate for forced right ear ***:The novel test consistently showed LEA with good reliability and can be used to assess the hemispheric asymmetry in normal subjects and also in test batteries for the clinical population.

关键词： Dichotic listening test Cerebral dominance Hemispheric specialization Right cerebral hemisphere Left cerebral hemisphere