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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

Improvement of microstructure and mechanical Behavior of Gas Tungsten Arc Weldments of Alloy C-276 by Current Pulsing

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Acta metallurgica Sinica(English Letters) 2015年第2期28卷 208-215页

作者： m.manikandan n.Arivazhagan m.nageswara Rao G.madhusudhan reddy School of mechanical and Building Sciences VIT University Defence metallurgical and Research Laboratory

Superalloy C-276 is known to be prone to hot cracking during fusion welding by Gas Tungsten Arc method. microsegregation occurring during cooling of fusion zone with consequent appearance of topologically close-packed phases P and IX has been held responsible for the observed hot cracking. The present work investigated the possibility of suppressing the microsegregation in weldments by resorting to current pulse. Weldments were made by continuous current gas tungsten arc welding and pulsed current gas tungsten arc welding using ERniCrmo-4 filler wire. The weld joints were studied with respect to microstructure, microsegregation, and mechanical properties. Optical microscopy and scanning electron microscopy were employed to study the microstructure. Energy-Dispersive X-ray Spectroscopy was carried out to evaluate the extent of microsegregation. Tensile testing was carried out to determine the strength and ductility. The results show that the joints fabricated with pulsed current gave rise to narrower welds with practically no heat affected zone, a refined microstructure in the fusion zone, reduced microsegregation, and superior combination of mechanical properties.

关键词： Alloy C-276 Pulsed current gas tungsten arc welding microsegregation

HSRDn: High-Speed Router Design for Various no C Topologies

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Chinese Journal of Electronics 2020年第2期29卷 281-290页

作者： E.Lakshmi Prasad m.n.Giri Prasad A.R.reddy Department of ECE JNTUACE Department of RRC MITS

High-speed router design for network on chip(HSRDn) is proposed for controlling the traffic congestion and deadlocks. Diagonal based nearest-path routing algorithm for no C(DnRAn) can mitigate the effect of latency by opting for the nearest-path to reach the destination in a network and HSRDn is part of DnRAn. When we analyze the performance of DnRAn for all proposed topologies, nearly 50% better in terms of latency reduction and high throughput over existing router architectures. The proposed topologies(2 D-mesh,2 D-Star mesh over regional mesh(Smo Rm), 3 D-mesh,and 3 D-torus) are tested with various applications, viz,audio, video and so on. Here, we also tested with cryptography application for DnRAn. When we analyzed the performance of experimental results, exclusively in 2 D-Smo Rm nearly 0.6 times latency get reduced, area expanded by 0.25 and 0.33 times throughput increase in 2 D-Smo Rm compared with 3 D-mesh and 3 ***, DnRAn showed an exclusive performance in 2 D-Smo Rm compared with other two topologies.

关键词： Logic network on chip(noC) Virtual channels Latency Congestion Shortest path routing algorithm 3D-mesh 3D-torus

Dilatometric Sintering of Ti-2A1 and Ti-5AI Elemental Powders

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Journal of materials Science & Technology 2007年第3期23卷 363-366页

作者： Bharat B.PAnIGRAHI n.Subba reddy Karabi DAS m.m.GODKHInDI Department of metallurgical and materials Engineering Indian Institute of Technology Kharagpur

The effect of Al addition （2 and 5 at. pct） on sintering kinetics of Ti power were investigated. Al reduces the sintering rates, sinter density, increases activation energy of sintering and accelerates the grain growth. Sintering was controlled by mixed mode, i.e. transient liquid phase sintering, formation of intermetallics, and Ti grain boundary diffusion in TiAl2 and other intermetallics.

关键词： Dilatometry Sintering Diffusion Activation energy

Regulator of G protein signaling 6 mediates exercise-induced recovery of hippocampal neurogenesis,learning,and memory in a mouse model of Alzheimer’s disease

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neural Regeneration Research 2025年第10期20卷 2969-2981页

作者： mackenzie m.Spicer Jianqi Yang Daniel Fu Alison n.DeVore marisol Lauffer nilufer S.Atasoy Deniz Atasoy Rory A.Fisher Department of neuroscience and Pharmacology University of Iowa Carver College of MedicineIowa CityIAUSA Iowa neuroscience Institute University of Iowa Carver College of MedicineIowa CityIAUSA Interdisciplinary Graduate Program in molecular medicine University of Iowa Carver College of MedicineIowa CityIAUSA neural Circuits and Behavior Core University of Iowa Carver College of MedicineIowa CityIAUSA

Hippocampal neuronal loss causes cognitive dysfunction in Alzheimer’s *** hippocampal neurogenesis is reduced in patients with Alzheimer’s *** stimulates adult hippocampal neurogenesis in rodents and improves memory and slows cognitive decline in patients with Alzheimer’s ***,the molecular pathways for exercise-induced adult hippocampal neurogenesis and improved cognition in Alzheimer’s disease are poorly ***,regulator of G protein signaling 6(RGS6)was identified as the mediator of voluntary running-induced adult hippocampal neurogenesis in ***,we generated novel RGS6fl/fl;APP_(SWE) mice and used retroviral approaches to examine the impact of RGS6 deletion from dentate gyrus neuronal progenitor cells on voluntary running-induced adult hippocampal neurogenesis and cognition in an amyloid-based Alzheimer’s disease mouse *** found that voluntary running in APP_(SWE) mice restored their hippocampal cognitive impairments to that of control *** cognitive rescue was abolished by RGS6 deletion in dentate gyrus neuronal progenitor cells,which also abolished running-mediated increases in adult hippocampal *** hippocampal neurogenesis was reduced in sedentary APP_(SWE) mice versus control mice,with basal adult hippocampal neurogenesis reduced by RGS6 deletion in dentate gyrus neural precursor ***6 was expressed in neurons within the dentate gyrus of patients with Alzheimer’s disease with significant loss of these RGS6-expressing ***,RGS6 mediated voluntary running-induced rescue of impaired cognition and adult hippocampal neurogenesis in APP_(SWE) mice,identifying RGS6 in dentate gyrus neural precursor cells as a possible therapeutic target in Alzheimer’s disease.

关键词： adult hippocampal neurogenesis Alzheimer’s disease dentate gyrus exercise learning/memory neural precursor cells regulator of G protein signaling 6(RGS6)

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

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

molybdenum disulfide and magnesium oxide nanoparticle performance on micropolar Cattaneo-Christov heat flux model

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Applied mathematics and mechanics(English Edition) 2021年第4期42卷 541-552页

作者： m.G.reddy S.A.SHEHZAD Department of mathematics Acharya Nagarjuna University CampusOngole 523001Andhra PradeshIndia Department of mathematics COMSATS University IslamabadSahiwal 57000Pakistan

This article intends to illustrate the Darcy flow and melting heat transmission in micropolar *** major advantage of micropolar fluid is the liquid particle rotation through an independent kinematic vector named the microrotation *** novel aspects of the Cattaneo-Christov(C-C)heat flux and Joule heating are incorporated in the energy transport *** different nanoparticles,namely,moS2 and mgO,are suspended into the *** governing partial differential equations(PDEs)of the prevailing problem are slackening into ordinary differential expressions(ODEs)via similarity *** resulting mathematical phenomenon is illustrated by the implication of fourth-fifth order Runge-Kutta-Fehlberg(RKF)*** fluid velocity and temperature distributions are deliberated by using graphical phenomena for multiple values of physical *** results are displayed for both molybdenum disulphide and magnesium oxide nanoparticles.A comparative benchmark in the limiting approach is reported for the validation of the present *** is revealed that the incrementing material constraint results in a higher fluid velocity for both molybdenum disulphide and magnesium oxide nanoparticle situations.

关键词： micropolar fluid Cattaneo-Christov(C-C)heat flux molybdenum disulphide nanoparticle melting effect numerical solution

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