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Search Results: 1 - 10 of 419904 matches for " V. S. Reddy Channu "
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Soft-Chemical Synthesis of Vanadium Oxide Nanostructures Using 3, 3’, 3”-Nitrilotripropionic Acid ( NTP) as a Carrier  [PDF]
V. S. Reddy Channu, Rudolf Holze, B. Rambabu
Soft Nanoscience Letters (SNL) , 2011, DOI: 10.4236/snl.2011.13012
Abstract: Vanadium oxide nanostructures were synthesized using NTP as a carrier through soft-chemical method. The influence of calcination temperature on the phase and morphology of obtained pristine product were characterized using X-ray diffraction (XRD), thermal gravimetric analysis (TGA) and scanning electron microscopy (SEM). Cyclic voltammogram studies were conducted to examine the electrochemical performance of cathodes made of vanadium oxide nanostructures. X-ray diffraction results show that, the particle size of the nanomaterials is increases with the increasing of calcination temperature.
Synthesis and Characterization of La0.8Sr0.2MnO3-δ Nanostructures for Solid Oxide Fuel Cells  [PDF]
V. S. Reddy Channu, Rudolf Holze, Edwin H. Walker
New Journal of Glass and Ceramics (NJGC) , 2013, DOI: 10.4236/njgc.2013.31005
Abstract: La0.8Sr0.2MnO3-δ (LSM) perovskite was synthesized using different methods, such as solid state reaction, soft-chemical and sol-gel methods for solid oxide fuel cells (SOFCs) for use as a cathode material. The pristine material was characterized by X-ray diffraction, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and scanning electron microscopy (SEM). X-ray diffraction results show that the pure phase of La0.8Sr0.2MnO3-δ (LSM) perovskite was formed at 1250oC. Scanning electron microscopy characterization shows that a highly porous material can be obtained using a soft-chemical method with different 3,3,3-nitrilotripropionic acid ( NTP) to metal-ion ratio R.
Synthesis and Characterization of La0.75Sr0.25Cr0.5Mn0.5O3-δ Nanoparticles Using a Combustion Method for Solid Oxide Fuel Cells  [PDF]
V. S. Reddy Channu, Rudolf Holze, Edwin H. Walker, Rajamohan R. Kalluru
New Journal of Glass and Ceramics (NJGC) , 2011, DOI: 10.4236/njgc.2011.12010
Abstract: La0.75Sr0.25Cr0.5Mn0.5O3-δ (LSCM) perovskite nanoparticles for use as anode material in intermediate temperature solid oxide fuel cells (IT-SOFCs) were synthesized using 3,3’,3”- nitrilotripropionic acid (NTP), citric acid and oxalic acid as carriers via a combustion method. The influence of the carrier on phase and morphology of the obtained pristine products was characterized using X-ray diffraction (XRD), thermal gravimetric analysis (TGA), and scanning electron microscopy (SEM). XRD results showed, that the LSCM had rhombohedral symmetry with R-3c space group; a single phase LSCM perovskite formed after calcination of fired gel at 1200°C for 7 h. Scanning electron microscopy analysis of the pristine powders showed spherical shape and particle sizes in the range of 50 – 500 nm.
Effect of Ca on the Properties of Gd-Doped Ceria for IT-SOFC  [PDF]
S. Ramesh, G. Upender, K. C. James Raju, G. Padmaja, S. Mohan Reddy, C. V. Reddy
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.46116
Abstract:

Ceria based electrolyte materials are very useful in intermediate-temperature solid oxide fuel cell (IT-SOFC). The compositions Ce0.85Gd0.15 - xCaxO2 - δ (x = 0.0 - 0.075) were prepared through sol-gel method. Their structure was studied by X-ray diffraction. Dense ceramic Ce0.85Gd0.15 - xCaxO2 - δ samples were prepared by sintering the pellets at 1300°C. The lattice parameter was calculated by Rietveld refinement of XRD patterns. Four probe A.C. impedance spectroscopy was used to study the total ionic conductivity of doped and co-doped ceria ceramics in the temperature range 200°C -

General Government Expenditure and Economic Growth in India: 1980-81 to 2015-16  [PDF]
S. V. Seshaiah, T. Koti Reddy, I. R. S. Sarma
Theoretical Economics Letters (TEL) , 2018, DOI: 10.4236/tel.2018.84050
Abstract: The objective of this paper is to investigate the impact of General government expenditure on GDP growth in India for the period 1980-81 to 2015-16 by using Simple Regression Analysis. FDI Growth Rate and two dummy variables i.e., one for financial crisis 2008 and another one for reform period 1991 have been used. All the explanatory variables are positively and significantly affecting the GDP growth rate except FDI Growth rate. The crisis period dummy shows that in post 2008 there was a negative and significant impact of general government expenditure on GDP growth rate. The reform period dummy shows that in post 1991 there was a positive and significant impact of general government expenditure on GDP growth rate. We have tested the multicollinearity test, which indicates presence of no serial correlation among the explanatory variables. We have also tested the autocorrelation, using the Breutch Pagan test, the results of which indicate the presence of no autocorrelation. The study further reveals that Non-development expenditures continue to be a large proportion of the general government expenditure. Expenditure management has to lay more emphasis on the design of the programme and the exploration of the alternatives. The authors suggest that there is a need to raise the development expenditure on infrastructure to achieve more economic growth. The study highlights that in addition to fiscal correction and consolidation, fiscal reform at the state level should focus on fixing ceilings on guarantees, taking into account the default and development probability, nature of guarantees issued, pricing of services rendered by the project for which guarantees are extended.
Annealing Effects on Electrical Properties and Interfacial Reactions of Ni/Cu Schottky Rectifiers on n-Type InP  [PDF]
Yerpedu Munikrishna Reddy, M. K. Nagaraj, S. Sankar Naik, V. Rajagopal Reddy
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.37074
Abstract: We report on the effect of annealing temperature on electrical, interfacial reactions and surface morphological properties of Ni/Cu Schottky contacts on n-type InP. The extracted barrier height of as-deposited Ni/Cu Schottky contact is 0.59 eV (I-V) respectively. The high-quality Schottky contact with barrier height and ideality factor of 0.65 eV (I-V) and 1.15 respectively, can be obtained after annealing at 300℃ for 1 min in a nitrogen atmosphere. However, annealing at 400℃, results the decrease in the barrier height to 0.54 eV (I-V). From the above observations, it is observed that Ni/Cu Schottky contact exhibited excellent electrical properties after annealing at 300℃. Hence, the optimum annealing temperature for the Ni/Cu Schottky contact is 300℃. Furthermore, Cheung’s functions is used to extract the diode parameters including ideality factor, barrier height and series resistance. According to the XRD analysis, the formation of the indium phases at the Ni/Cu/n-InP interface could be the reason for the increase in the barrier height at annealing temperature 300℃. Further, the degradation of the barrier heights after annealing at 400℃ may be due to the formation of phosphide phases at the Ni/Cu/n-InP interface. Scanning electron microscopy (SEM) results show that the overall surface morphology of the Ni/Cu Schottky contact is reasonably smooth.
Stripping Voltammetric Determination of Uranium in Water Samples Using Hg-Thin Film Modified Multiwall Carbon Nanotube Incorporated Carbon Paste Electrode  [PDF]
S. Sahoo, A. K. Satpati, A. V. R. Reddy
American Journal of Analytical Chemistry (AJAC) , 2013, DOI: 10.4236/ajac.2013.43019
Abstract:

The variables affecting determination of ultra trace levels of uranium (VI) in aqueous samples by differential pulse cathodic stripping voltammetry were examined in detail using Hg-thin film modified carbon paste and multiwall carbon nanotube (MWCNT) incorporated carbon paste electrode. Carbon paste electrode prepared in the laboratory was modified with Hg thin film and used as the working electrode. MWCNT was incorporated into the carbon paste for enhancement in sensitivity of the measurements. Electrochemical response for the uranium (VI) reduction peak was found to be well resolved on the thin mercury film modified carbon paste surface and also with the MWCNT modification. Characteristics of the adsorption preconcentration process were investigated using electrochemical impedance measurements. Electrochemical signals were observed to be enhanced on MWCNT modification of the carbon paste.

Synthesis and Characterization of (Ru-Sn)O2 Nanoparticles for Supercapacitors  [PDF]
Venkata Subba Reddy Channu, Rudolf Holze, Scott Ambrose Wicker Sr., Edwin H. Walker Jr., Quinton L. Williams, Rajamohan R. Kalluru
Materials Sciences and Applications (MSA) , 2011, DOI: 10.4236/msa.2011.29158
Abstract: The electrode materials SnO2, RuO2 and (Sn-Ru)O2 were synthesized through precipitation method from SnCl2·2H2O and RuCl2·2H2O solutions. The obtained nano-sized pristine products were characterized using X-ray diffractometry, Scanning Electron Microscopy (SEM), differential scanning calorimetry (DSC)-thermogravimetric analysis (TGA) and cyclic voltammetry (CV). The Debye–Scherrer formula was used to estimate the average size of the nanoparticles SnO2 (36 nm), RuO2(24 nm), and (Sn-Ru)O2 (19 nm). Electrochemical studies were carried out to examine the capacitance of SnO2, RuO2, (Sn-Ru)O2 electrodes in 0.5 M H2SO4 at various scan rates. The estimated electrode capacitance was de-termined to decrease with an increase of scan rate.
Modeling and Speed Control of Induction Motor Drives Using Neural Networks
V. Jamuna,S. Rama Reddy
Annals of Dunarea de Jos , 2010,
Abstract: Speed control of induction motor drives using neural networks is presented. The mathematical model of single phase induction motor is developed. A new simulink model for a neural network-controlled bidirectional chopper fed single phase induction motor is proposed. Under normal operation, the true drive parameters are real-time identified and they are converted into the controller parameters through multilayer forward computation by neural networks. Comparative study has been made between the conventional and neural network controllers. It is observed that the neural network controlled drive system has better dynamic performance, reduced overshoot and faster transient response than the conventional controlled system.
Comparative evaluation of shear bond strength of two self-etching adhesives (sixth and seventh generation) on dentin of primary and permanent teeth: An in vitro study
Yaseen S,Subba Reddy V
Journal of the Indian Society of Pedodontics and Preventive Dentistry , 2009,
Abstract: Aim: The present study was undertaken to compare and evaluate shear bond strength of two self-etching adhesives (sixth and seventh generation) on dentin of primary and permanent teeth. Materials and Methods: Flat dentin surface of 64 human anterior teeth (32 primary and 32 permanent) divided into four groups of 16 each. Groups A and C were treated with Contax (sixth generation), while groups B and D were treated with Clearfil S3 (seventh generation). A teflon mold was used to build the composite (Filtek Z-350) cylinders on the dentinal surface of all the specimens. Shear bond strength was tested for all the specimens with an Instron Universal Testing Machine. Data were statistically analyzed using one-way ANOVA for multiple group comparison, followed by student′s unpaired ′t′ test for group-wise comparison. Results: There was no statistically significant difference in shear bond strength among the study groups except that primary teeth bonded with Contax exhibited significantly lesser shear bond strength than permanent teeth bonded with Clearfil S3. Conclusion: This study revealed that Clearfil S3 could be of greater advantage in pediatric dentistry than Contax because of its fewer steps and better shear bond strength in dentin of both primary and permanent teeth.
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