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Mechanical properties of ni_(0.83)Co_(0.15)Cu_(0.02)Fe_(1.9)O_(4-δ)+PbZr_(0.52)Ti_(0.48)O_(3)particulate composites by composite oscillator technique and the correlation with the results of magnetoelectric properties

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Journal of Advanced Ceramics 2012年第4期1卷 317-326页

作者： M.Venkata RAMAnA M.Penchal reddy n.ramamanohar reddy B.S.MURTY K.V.SIVA KUMAR Shenhua SOnG Shenzhen Key Laboratory of Advanced Materials Department of Materials Science and EngineeringShenzhen Graduate SchoolHarbin Institute of TechnologyShenzhen 518055China Department of Physics Changwon National UniversityChangwonRepublic of Korea Ceramic Composite Materials Laboratory Department of PhysicsSri Krishnadevaraya UniversityAnantapur 515003India nanotechnology Laboratory Department of Metallurgical and Materials EngineeringIndian Institute of TechnologyChennai 600036India

The xni_(0.83)Co_(0.15)Cu_(0.02)Fe_(1.9)O_(4-δ)+PbZr_(0.52)Ti_(0.48)O_(3)(PZT)particulate magneto ferroelectric composites with x=0,0.1,0.2,0.3,0.4,0.5 and 0.6 mole fraction were prepared by conventional ceramic double sintering *** presence of two phases(perovskite structure of ferroelectric phase and spinal structure of ferromagnetic phase)was confirmed by X-ray *** magnetoelectric(ME)property of the particulate composites was determined at room temperature as a function of intensity of magnetic *** temperature variation of the longitudinal modulus(L)and the internal friction(Q−1)of these particulate composites at 104.3 kHz was studied in the wide temperature range 30-420℃.The temperature variation of the longitudinal modulus in each composition of these particulate composites showed two abrupt *** minimum coincided with the ferroelectric-paraelectric Curie transition temperature(θE)and the other with the ferromagnetic-paramagnetic Curie transition temperature(θM).The internal friction measurement also showed two sharp peaks in each composition corresponding to those temperatures where the minima were noticed in the temperature variation of the longitudinal modulus behaviour.

关键词： X-ray diffraction magnetoelectric effect piezoelectric coefficient internal friction Curie transition temperature

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SYnTHESIS OF LEAD FREE SODIUM BISMUTH TITAnATE(nBT)CERAMIC BY COnVEnTIOnAL AnD MICROWAVE SInTERInG METHODS

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Journal of Advanced Dielectrics 2011年第1期1卷 71-77页

作者： M.VEnKATA RAMAnA S.ROOPAS KIRAn n.ramamanohar reddy K.V.SIVA KUMAR V.R.K.MURTHY B.S.MURTY Ceramic Composite Materials Laboratory Department of Physics Sri Krishnadevaraya UniversityAnantapur 515003India Microwave Laboratory Department of Physics Indian Institute of Technology Chennai 600036India nanotechnology Laboratory Department of Metallurgical and Materials Engineering Indian Institute of Technology Chennai 600036 India

Dielectric studies were carried out on a lead free Sodium Bismuth Titanate,nBT,(na_(0.5)Bi_(0.5)TiO_(3))*** material was synthesized by conventional ceramic method(CS)and microwave sintering(MS).The presence of single phase has been confirmed by X-ray diffraction and scanning electron microscopy of nBT *** later technique(MS)resulted in material with high density,dielectric properties and improved *** transition temperature was observed slightly higher for microwave sintered(MS)*** modulus measurements are very sensitive property to identify the phase transitions in *** modulus(L)measurements were also employed on these samples in the frequency 136 kHz and can be studied in the wide temperature range 30℃to 400℃.The elastic behavior(L)showed a break at two temperatures(~200℃and 350℃)in both the conventional and microwave sintered *** nBT ceramics,permittivity anomalies are connected to modulus *** results are correlated with the dielectric *** behavior explained in the light of structural phase transitions in the ferroelectric ceramics.

关键词： Microwave sintering nBT X-ray diffractometer scanning electron microscopy dielectric properties longitudinal modulus

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A low power, eco-friendly multipurpose thermoelectric refrigerator

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Frontiers in Energy 2016年第1期10卷 79-87页

作者： n. Jagan Mohan reddy Deparmaent of ECE Chaitanya Bharathi Institute of Technology Hyderabad 500075 India

There has been an immense endeavor to mitigate global warming in spite of which it has only been worse. This paper presents the design and imple- mentation of a low power and eco-friendly refrigeration system using the thermoelectric effect. The conventional refrigerators make use of complex mechanisms which involves synchronous operation of various units, namely the compressor, condensers, expansion valves, evaporator, refi＇igerant and so on. But a thermoelectric refrigerator exploits the principle of the Peltier effect, thus avoiding the utilization of these complex components. This even helps curb the release of harmful chlorofluorocarbons （CFCs） into the atmosphere which contributes to the increase in global temperature. Moreover, the temperature can be controlled and set to required values with the help of a microcontroller. Hence, this can be used both for domestic and commercial purposes. The unit does not eject any harmful gases. Therefore, the heat expelled from the unit can be tapped for heating utilities, making the use of this device versatile in its application. Thus this proposal aims not only at reducing the air pollutants by not contributing to it but also at reducing the power consumption.

关键词： low power eco-friendly multipurpose TEC- 12706 Peltier effect microcontroUer (P89V51RD2Bn) temperature control

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Annealing effects on the structural and optical properties of ZnO nanoparticles with PVA and CA as chelating agents

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Journal of Advanced Ceramics 2015年第2期4卷 123-129页

作者： A.n.MALLIKA A.Ramachandra reddy K.Venugopal reddy Department of Physics Materials Science LaboratoryNational Institute of TechnologyWarangal-506004TelanganaIndia

The effects of annealing temperatures and chelating agents on the structural and optical properties of ZnO nanoparticles were *** average particle size of ZnO nanoparticles increased with increase of annealing *** decrease of the full width at half maximum(FWHM)with increasing annealing temperatures inferred increase of particle/grain *** grain sizes were also observed to be increased with increase of annealing *** the absorption spectra of the samples,the absorption was red-shifted and the energy band gap was blue-shifted with increase of annealing temperatures.A sharp UV emission peak was observed and the intensity of this peak increased with annealing temperatures corresponding to the high crystallinity in the *** high annealing temperature of 700℃,ZnO exhibited a less intense deep level *** negligible deep level emission was attributed to the oxygen vacancies created at higher annealing temperatures.

关键词： ZnO nanostructures citric acid(CA) polyvinyl alcohol(PVA) chelating agents scanning electron microscopy(SEM) optical properties

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Facile one-step hydrothermal route to MSe/Mo_(3)Se_(4)(M:Zn,Mn,and ni)-based electrode materials for ultralong-life hybrid supercapacitors

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Journal of Materials Science & Technology 2023年第25期156卷 230-240页

作者： B.n.Vamsi Krishna Obula reddy Ankinapalli Ayyaluri Ramakrishna reddy Jae Su Yu Department of Electronics and Information Convergence Engineering Institute for Wearable Convergence ElectronicsKyung Hee UniversityYongin-siGyeonggi-do 17104Republic of Korea

Transition metal selenides have attracted great interest in electrochemical energy storage applications because of their good electrochemical activity and conductivity ***,we reported the metal molybdenum selenide(M Se/Mo_(3)Se_(4)(M:Zn,Mn,and ni))electrode materials on their morphological and electrochemical properties by varying the metal ions via a facile hydrothermal *** effects of the structural,morphological,and surface area properties of the prepared powder materials on their electrochemical performance were *** to the hierarchical porous and unique interconnected structure,the nickel molybdenum selenide nanosheet spheres(nMS nSSs)-based electrode material delivered an excellent specific capacity value of 252 mAh g^(-1) at a current density of 1 Ag^(-1).Moreover,the optimized nMS nSSs electrode exhibited outstanding cycling stability with a capacity retention of 80%and a corresponding coulombic efficiency of 99%after 80,000 ***,a pouch-type hybrid supercapacitor(HSC)device was assembled using nMS nSSs material as a positive electrode and activated carbon as a negative electrode in 1 M aqueous KOH ***,the assembled HSC device exhibited superior energy and power density values as well as magnificent cycling *** real-time practical applications,light-emitting diodes and a digital display were powered using two series-connected HSC ***,the obtained tremendous results strongly suggest that the niSe/Mo_(3)Se_(4) nSSs-based materials could be a promising electrode for ultralong-life energy storage applications.

关键词： nickel selenides Molybdenum selenides nanosheet spheres Ultralong-life cycling stability

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Om:One tool for many (Indian) languages

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2005年第11期6卷 1348-1353页

作者： GAnAPATHIRAJU Madhavi BALAKRISHnAn Mini BALAKRISHnAn n. reddy Raj Language Technologies Institute Carnegie Mellon University Pittsburgh PA 15213 USASupercomputer Education and Research Centre Indian Institute of Science Bangalore 560 012 IndiaSupercomputer Education and Research Centre Indian Institute of Science Bangalore 560 012 IndiaLanguage Technologies Institute Carnegie Mellon University Pittsburgh PA 15213 USA

Many different languages are spoken in India, each language being the mother tongue of tens of millions of people. While the languages and scripts are distinct from each other, the grammar and the alphabet are similar to a large extent. One common feature is that all the Indian languages are phonetic in nature. In this paper we describe the development of a translit- eration scheme Om which exploits this phonetic nature of the alphabet. Om uses ASCII characters to represent Indian language alphabets, and thus can be read directly in English, by a large number of users who cannot read script in other Indian languages than their mother tongue. It is also useful in computer applications where local language tools such as email and chat are not yet available. Another significant contribution presented in this paper is the development of a text editor for Indian languages that integrates the Om input for many Indian languages into a word processor such as Microsoft WinWord?. The text editor is also developed on Java? platform that can run on Unix machines as well. We propose this transliteration scheme as a possible standard for Indian language transliteration and keyboard entry.

关键词： Om transliteration Indian language technologies Text editor

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Optical and Microstructural Characterisations of Pulsed rf Magnetron Sputtered Alumina Thin Film

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Journal of Materials Science & Technology 2013年第10期29卷 929-936页

作者： I.neelakanta reddy V.Rajagopal reddy n.Sridhara S.Basavaraja A.K.Sharma Arjun Dey Thermal Systems Group ISRO Satellite CentreVimanapura Post Department of Physics Sri Venkateswara University Bruker India nanotechnology Laboratory Jawaharlal Nehru Centre for Advanced Scientifc Research (JNCASR)

Alumina thin films were deposited on fused quartz and SS304 substrate by pulsed rf magnetron sputtering with both direct and reactive methods. The films were characterised by energy dispersive X-ray spectroscopy, X-ray diffraction, scanning electron microscopy, field emission scanning electron microscopy and atomic force microscopy to reveal the microstructure, surface morphology and topography of thin films. Transmittance and reflectance of alumina thin film were evaluated after deposition on the quartz substrate. Transmittance of the quartz remains almost un-altered when alumina was deposited by the reactive sputtering. A marginal decrease of ~4% in the transmittance of quartz was, however, observed after deposition of alumina by direct sputtering. Infrared emittance of the substrate also remains almost constant after deposition of thin alumina film. Further, as-deposited alumina on SS304 obtained by both direct and reactive sputtering process was amorphous in nature. However, after annealing crystalline peaks were observed.

关键词： Alumina Thin film rf magnetron sputtering Microstructure Transmittance Reflectance Infrared emissivity

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The Correlation Coefficient of Hesitancy Fuzzy Graphs in Decision Making

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Computer Systems Science & Engineering 2023年第7期46卷 579-596页

作者： n.Rajagopal reddy S.Sharief Basha School of Advanced Sciences Vellore Institute of TechnologyVellore632014TamilnaduIndia

The hesitancy fuzzy graphs(HFGs),an extension of fuzzy graphs,are useful tools for dealing with ambiguity and uncertainty in issues involving decision-making(DM).This research implements a correlation coefficient measure(CCM)to assess the strength of the association between HFGs in this article since CCMs have a high capacity to process and interpret *** CCM that is proposed between the HFGs has better qualities than the existing *** lowers restrictions on the hesitant fuzzy elements’length and may be used to establish whether the HFGs are connected negatively or ***,a CCMbased attribute DM approach is built into a hesitant fuzzy *** article suggests the use of weighted correlation coefficient measures(WCCMs)using the CCM concept to quantify the correlation between two *** decisionmaking problems of hesitancy fuzzy preference relations(HFPRs)are *** research proposes a new technique for assessing the relative weights of experts based on the uncertainty of HFPRs and the correlation coefficient degree of each *** paper determines the ranking order of all alternatives and the best one by using the CCMs between each option and the ideal *** the meantime,the appropriate example is given to demonstrate the viability of the new strategies.

关键词： Hesitancy fuzzy graph correlation coefficient measures energy hesitancy fuzzy preference relationships decision making

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A multi-preference integrated algorithm(MPIA)for the deep learning-based recommender framework(DLRF)

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International Journal of Intelligent Computing and Cybernetics 2022年第4期15卷 625-641页

作者： Vikram Maditham n.Sudhakar reddy Madhavi Kasa Computer Science and Engineering JNTUA CEAAnantapurIndia Sri Venkateswara College of Engineering TirupatiIndia JnTUA AnanthapuramuIndia

Purpose-The deep learning-based recommender framework(DLRF)is based on an improved long short-term memory(LSTM)structurewith additional controllers;thus,it considers contextual information for state *** also handles irregularities in the data to enhance performance in generating recommendations while modelling short-term *** algorithm named a multi-preference integrated algorithm(MPIA)is proposed to have dynamic integration of both kinds of user preferences *** experiments are made using Amazon benchmark datasets,and the results are compared with many existing recommender systems(RSs).Design/methodology/approach-RSs produce quality information filtering to the users based on their *** the contemporary era,online RSs-based collaborative filtering(CF)techniques are widely used to model long-term preferences of *** deep learning models,such as recurrent neural networks(Rnns),it became viable to model short-term preferences of *** the existing RSs,there is a lack of dynamic integration of both long-and short-term *** this paper,the authors proposed a DLRF for improving the state of the art in modelling short-term preferences and generating recommendations as ***-The results of the empirical study revealed that the MPIA outperforms existing algorithms in terms of performance measured using metrics such as area under the curve(AUC)and *** percentage of improvement in terms AUC is observed as 1.3,2.8,3 and 1.9%and in terms of F-1 score 0.98,2.91,2 and 2.01%on the ***/value-The algorithm uses attention-based approaches to integrate the preferences by incorporating contextual information.

关键词： Collaborative filtering Deep learning User preference integration Recommender systems

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Synthesis and optical characterization of porous ZnO

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Journal of Advanced Ceramics 2013年第3期2卷 260-265页

作者： K.SOWRI BABU A.RAMACHAnDRA reddy Ch.SUJATHA K.VEnUGOPAL reddy A.n.MALLIKA Department of Physics National Institute of Technology WarangalWarangal-506004Andhra PradeshIndia

In this paper,a simple and cheap method to prepare porous ZnO by using zinc nitrate,ethanol and triethanolamine(TEA)is *** as-prepared sample consisted of nano and micro *** sample was calcined at 300℃,400℃and 500℃with different heating *** 500℃,the nano pores disappeared but the sample maintained its micro *** emission scanning electron microscopy(FE-SEM)pictures confirmed that the size and growth of ZnO nanoparticles depended on the heating *** infrared(IR)absorption peak of Zn-O stretching vibration positioned at 457 cm^(-1)was split into two peaks centered at 518 cm^(-1)and 682 cm^(-1)with the change of *** results confirmed that Fourier transform infrared(FT-IR)spectrum was sensitive to variations in particle size,shape and *** photoluminescence(PL)spectrum of porous ZnO contained five emission peaks at 397 nm,437 nm,466 nm,492 nm and 527 *** intensity enhanced monotonously with increase of temperature and the change was rapid between temperatures of 300℃and 500℃.This was due to the elimination of organic species and improvement in the crystallanity of the sample at 500℃.

关键词： semiconductors porous ZnO optical properties

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