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Progress in Natural Science:Materials International 2022年第1期32卷 79-86页

作者： ch.suresh vid.a.a.a. D.B.Karunakar Department of Architecture and Planning Indian Institute of Technology Roorkee Mechanical and Industrial Engineering Department Indian Institute of Technology Roorkee

This study reports the influence of sintering mechanism and reinforcement materials on the formation of ultra-fine and nanograins in Al-TiB-Y nanohybrid composites. The mechanical properties of the composites and their corresponding micro and nanostructures are correlated. The experimental and characterization results revealed that despite the addition of TiB, the hard and brittle AlTi phase formation in the composites was suppressed and hence, their ductility was retained. It was found that yttrium content of 0.3 wt% was the optimum amount which created advantageous spark plasma sintering conditions, and the addition of 0.3 wt% promoted the formation of bi-modal size grains（ultra-fine and nano） along with micro grains, Ω and other nano precipitates, resulting in a significant enhancement in the composite properties. The formation of ultra-fine and nanograins may be attributed to the combined effect of melting and rapid solidification at necking zones due to Joule’s heating and thermomechanical fatigue. Among all the sintered composites, the highest hardness（137 HV）, ultimate tensile strength（UTS）(496 MPa), yield strength（YS）(438 MPa) with 15.7% elongation were obtained in the sintered sample reinforced with 1.0 wt% TiBand 0.3 wt% yttrium.

关键词： Hybrid composites Ultra-fine grains Nano grains Spark plasma sintering Nano precipitates Microstructure

Synthesis and characterization of Y and Dy co-doped ceria solid electrolytes for IT-SOFCs:a microwave sintering

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Rare Metals 2021年第11期40卷 3329-3336页

作者： ch.Madhusudan Venkataramana Kasarapu Madhuri chittimadula Y.suresh Reddy C.Vishnuvardhan Reddy Department of Physics Osmania UniversityHyderabadTelangana 500007India

In this communication,the electrical conductivities and thermal expansion studies of microwave sintered co-doped ceria Ce_(0.8)Y_(0.2-x)Dy_(x)O_(2-δ)(x=0,0.05,0.10,0.15 and 0.20) solid electrolyte materials for intermediate temperature solid oxide fuel cells(IT-SOFCs)synthesized by sol-gel auto-combustion method were *** sintering at 1300℃ for 30 min was used for making dense powder *** relative densities of all the samples are noticed above 95%.Raman spectrum was characterized by the presence of a very strong band near 460 cm^(-1),which along with X-ray diffraction(XRD) analysis ascertain the sample formation with a single-phase cubic fluorite *** lattice parameter values were calculated from XRD *** images show nearly uniform grains with distinct grain *** thermal expansion coefficients(TECs) are found to vary linearly with temperature and were measured in the range from 14.15 to 13.20×10^(-6)℃^(-1).The investigation on total ionic conductivity(TIC) was executed with variation in dopant concentration and relative oxygen *** impedance analysis reveals that the sample Ce_(0.80)Y_(0.10)Dy_(0.10)O_(2-δ) displays the highest TIC,i.e.,7.5×10^(-3) S·cm^(-1) at 500℃ and minimum activation energy 0.90 eV compared to *** the highest TIC and minimum activation energy,the Ce_(0.80)Y_(0.10)Dy_(0.10)O_(2-δ)might be the possible material as the solid electrolyte in intermediate temperature SOFCs.

关键词： Microwave sintering Ionic conductivity Co-doped ceria Solid electrolyte Intermediate temperature solid oxide fuel cells

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characteristics of La-modified Ni-Al_2O_3 and Ni-SiO_2 catalysts for CO_x-free hydrogen production by catalytic decomposition of methane

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Journal of Energy chemistry 2013年第6期22卷 853-860页

作者： chatla Anjaneyulu Velisoju Vijay Kumar suresh K.Bhargava Akula Venugopal Inorganic & Physical chemistry Division CSIR-Indian Institute of Chemical Technology College of Science Engineering and Health Advanced Materials & Industrial Chemistry School of Applied Sciences RMIT University

Hydrotalcite precursors of La modified Ni-Al2O3 and Ni-SiO2 catalysts prepared by co-precipitation method and the catalytic activities were examined for the production of COx-free H2 by ch4 decomposition. Physico-chemical characteristics of fresh, reduced and used catalysts were evaluated by XRD, TPR and O2 pulse chemisorptions, TEM and BET-SA techniques. XRD studies showed phases due to hydrotalcite-like precursors in oven dried form produced dispersed NiO species upon calcination in static air above 450 C. Raman spectra of deactivated samples revealed the presence of both ordered and disordered forms of carbon. Ni-La-Al2O3catalyst with a mole ratio of Ni : La : Al = 2 : 0.1 : 0.9 exhibited tremendously high longevity with a hydrogen production rate of 1300 molH2 mol 1 Ni. A direct relationship between Ni metal surface area and hydrogen yields was established.

关键词： ch4 decomposition Ni-La-Al hydrotalcite Ni metal surface area COx-free H2

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SYNTHESIS,chARACTERIZATION AND ELECTRICAL PROPERTIES OF Nd/Zr CO-DOPED NANO BaTiO_(3) CERAMICS

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Journal of Advanced Dielectrics 2012年第1期2卷 34-47页

作者： ch.SAMEERA DEVI M.B.suresh G.S.KUMAR G.PRASAD Department of Physics Osmania University HyderabadAndhra Pradesh 500007India International Advance Research Centre for Metallurgy and New Materials BalapurHyderabad 500007India Department of Physics Osmania University HyderabadAndhra Pradesh500007India

Ceramic samples of composition Ba_(1-3)xNd_(2x)Ti_(1-y)ZryO_(3)(x=0.025;y=0.025 and 0.05)were synthesized by modified sol-gel *** confirmation,surface morphology and electrical properties of the samples were studied using XRD,FESEM,impedance spectroscopy and DC ***,AC and DC conductivities of the samples were recorded in the temperature range room temperature(RT)-500℃.From impedance data,various parameters like bulk resistance(R_(b)),bulk capacitance(C_(b)),grain resistance(R_(g)),grain boundary resistance(R_(gb)),grain capacitance(C_(g))and grain boundary capacitance(Cgb)T were *** parameters were found to be function of both temperature and *** and grain boundary relaxation times(τ_(g),τ_(gb))were also evaluated as a function of *** AC and DC conductivity plots activation energies for conduction were *** obtained lead to improved understanding of conductivity and charge transportation kinetics in the present system of samples.

关键词： Sol-gel method BaTiO_(3) impedance spectroscopy DC conductivity AC conductivity

Transformation of User Interface to Activity Models and Assessing Performance of WA/WS

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Journal of Software Engineering and Applications 2019年第5期12卷 101-126页

作者： ch. Ram Mohan Reddy D. Evangelin Geetha R. V. Raghvendra Rao T. V. suresh Kumar B.M.S College of Engineering Bengaluru India Ramaiah Institute of Technology Bengaluru India

Quality of Service is an important attribute of a software system. In retrospect, performance assessment based on user interaction with the system has given a better understanding of underlying disciplines of the product. In this paper, we capture user interaction with the prototype/User Interface (UI). An approach for developing activity model from the user interface model is presented using workflows and functional elements. A methodology is proposed to transform UI into activity diagram. The approach is validated by an experimental setup using Amazon service. The performance of Amazon service is assessed using activity based performance prediction methodology, and the simulation results are obtained using SMTQA.

关键词： Web Services Software Performance Engineering Web Applications Software Size Estimation Activity Based Performance Prediction Unified Modeling Language

Accessibility of Simple Gases in Disordered Nanoporous Materials:Theory and Simulation

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Accessibility of Simple Gases in Disordered Nanoporous Mater...

The 12th Asian Pacific Confederation of chemical Engineering Congress

作者： suresh K Bhatia Division of chemical Engineering The University of QueenslandQLD 4067Australia

Besides their importance in industrial separation,simple gases such as N,At,CO,and ch are widely used as probing gases for characterization of the microstructure of porous ***- ever,quantitatively consistent characterisation is rarely achieved from the use of adsorption meas- urements of different gases,largely due to differences in their pore *** latter also of- ten leads to uncertainties in the prediction of isotherms of any gas based on characterisations using

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使用打印机口作为测量大电流的安培表

电子设计技术 2001年第3期8卷 88-88页

作者： K suresh India Indira Gandhi Centre for Atomic Research Kalpakkam

使用一些廉价的元、器件和一个INT1ch电路,我们就能把PC的打印口改装成能测大电流的安培表。本项设计的目标就是测量远程的大电流但也可把这种方法用于远程测量任何其他相似的模拟电量,例如电压和电

关键词：大电流打印口计数器记录仪地址子程序软件安培表电流表