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Ranchi, India

Birla Institute of Technology, Mesra is a technically oriented institute of higher education located in Jharkhand, India. It is a deemed University under the UGC Act, 1956.Since the inception of the main campus in Mesra, it has established extension centres in Ras-al-Khaimah and Muscat. Wikipedia.

Srinivasulu A.,Birla Institute of Technology
International Journal of Circuit Theory and Applications | Year: 2011

The current paper presents a novel Schmitt trigger using two second-generation current conveyors and four resistors and its application as a relaxation oscillator. The performance of the proposed circuit is examined using Cadence and the model parameters of a 0.6Âμm CMOS process. The obtained results demonstrate excellent agreement with the theoretical values. The measured results based on commercially available current feedback operational amplifiers (AD 844 AN) are included and the non-idealities are also examined. The topology reports low sensitivities and has features suitable for VLSI implementation. Copyright © 2010 John Wiley & Sons, Ltd.

Roy J.P.,NTPC Ltd Kahalgaon | Misra A.,Birla Institute of Technology
Energy | Year: 2012

This paper presents an analysis of regenerative Organic Rankine Cycle (ORC), based on parametric optimization using R-123 and R-134a during superheating at a constant pressure of 2.50 MPa under realistic conditions. The aim was to select a better working fluid on the basis of obtained system efficiency, turbine work output, irreversibility rate and second law efficiency under applied fixed and variable heat source temperature conditions. R-123 has been found a better working fluid than R-134 for converting low grade heat to power. A computer program has been developed to parametrically optimize and compare the system and second law efficiency, turbine work output, system mass flow rate, irreversibility rate and irreversibility ratio with increases in turbine inlet temperature (TIT) under different heat source temperature conditions to obtain the optimum operating conditions while using R-123 as the working fluid during superheating at various turbine inlet pressures for the utilization of the waste heat sources of temperatures above 150 °C. The calculated results reveal that an inlet pressure of 2.70 MPa gives the maximum system efficiency, turbine work output and second law efficiency with minimum irreversibility rate, irreversibility ratio and system mass flow rate up to a TIT in the range of 165 °C-250 °C. © 2012 Elsevier Ltd.

Roy P.,Birla Institute of Technology | Srivastava S.K.,Indian Institute of Technology Kharagpur
Journal of Materials Chemistry A | Year: 2015

High-energy consumption in our day-to-day life can be balanced not only by harvesting pollution-free renewable energy sources, but also requires proper storage and distribution of energy. In this regard, lithium ion batteries are currently considered as effective energy storage devices and involve the most active research. There exist several review articles dealing with various sections of LIBs, such as the anode, the cathode, electrolytes, electrode-electrolyte interface etc. However, the anode is considered to be a crucial component affecting the performance of LIBs as evident from the tremendous amount of current research work carried out in this area. In the last few years, advancements have been focused more on the fabrication of the nanostructured anode owing to its special properties, such as high surface area, short Li+ ion diffusion path length, high electron transportation rate etc. As the work in this area is growing very fast, the present review paper deliberates the recent developments of anode materials on the nanoscale. Different types of anode materials, such as carbon-based materials, alloys, Si-based materials, transition metal oxides, and transition metal chalcogenides, with their unique physical and electrochemical properties, are discussed. Various approaches to designing materials in the form of 0, 1 and 2D nanostructures and their effect of size and morphology on their performance as anode materials in LIBs are reviewed. Moreover, the article emphasizes smart approaches for making core-shell particles, nanoheterostructures, nanocomposites or nanohybrids with the combination of electrochemically active materials and conductive carbonaceous or electrochemically inactive materials to achieve LIBs with high capacity, high rate capability, and excellent cycling stability. We believe the review paper will provide an update for the reader regarding recent progress on nanostructured anode materials for LIBs. © The Royal Society of Chemistry 2015.

Sahay R.R.,Birla Institute of Technology
Environmental Fluid Mechanics | Year: 2011

An artificial neural network (ANN) model is developed for predicting the longitudinal dispersion coefficient in natural rivers. The model uses few rivers' hydraulic and geometric characteristics, that are readily available, as the model input, and the target output is the longitudinal dispersion coefficient (K). For performance evaluation of the model, using published field data, predictions by the developed ANN model are compared with those of other reported important models. Based on various performance indices, it is concluded that the new model predicts the longitudinal dispersion coefficient more accurately. Sensitive analysis performed on input parameters indicates stream width, flow depth, stream sinuosity, flow velocity, and shear velocity to be the most influencing parameters for accurate prediction of the longitudinal dispersion coefficient. © 2010 Springer Science+Business Media B.V.

Singhal A.,Birla Institute of Technology
Journal of Alloys and Compounds | Year: 2012

Influence of Cr doping (5%) in ZnO lattice has been investigated in terms of modifications in electronic properties, evolution of defects and exploring their possible relationship with magnetic properties, using SQUID magnetometry and X-ray photoelectron spectroscopy (XPS). The Cr doping drives the diamagnetic ZnO host to a paramagnetic state, however, its post annealing in vacuum induces room temperature ferromagnetism (RTFM) in it that disappears by re-heating it in air. The findings infer a reversible ferromagnetic ordering in the Cr doped ZnO matrix. The XPS results indicate trivalent state of the Cr ions in the as-synthesized sample which tend to reduce to bivalency upon its vacuum annealing and also the evolution of oxygen vacancy defects have clearly been observed. The results indicate a close relationship of oxygen vacancies with the induced ferromagnetism. © 2011 Elsevier B.V. All rights reserved.

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