Sivanesskumar S.,AAMEC |
Journal of Theoretical and Applied Information Technology | Year: 2010
Multi Carrier Code Division Multiple Access (MC-CDMA), a promising technology for the 4G communication systems is considered in this paper. The foremost limitation of such system is the Multiple Access Interference (MAI) which is due to frequency-selective fading, near-far effect, frequency offset, and nonlinear power amplification. The performance of MC-CDMA under such scenario is poor and optimal detection is one of the solutions with a high complexity tag attached. Use of global optimization for such detectors, especially using Global Search algorithm is considered in this paper. The Bit Error Rate (BER) performance analysis is performed for frequency fading channels with and without non linear distortion. © 2005-2010 JATIT & LLS. All rights reserved.
European Journal of Scientific Research | Year: 2011
Safety performance in the construction industries have been strongly focussed in the recent years. Jobsite accidents have a strong impact on the construction industry. Construction projects are dynamic and are featured by several distinctive factors like frequent work team rotations, exposure to weather conditions, high proportionsof unskilled and temporary workers. The safety record of the construction industry is very bad when compared with other industries in india. The poor safety record of the construction industries are due to several factors such as complexity of the work or system, risk nature of works, management style, safety knowledge and commitment, and personal behavior. Due to the inefficient safety measures, there considerable amount of fatalities every year. So efficient mechanisms is very neccesary to reduce the fatality rate. In this paper, the construction fatal rate due to several accidents are analysed and statistically reported. Effective and novel approach to solve these problems and reducing the fatality rate is an important concern. An effective tool is introduced in this paper to improve the worker safety in construction site by integrating the management support and the behavioral safety of the workers. © EuroJournals Publishing, Inc. 2011.
Goudar D.M.,TCE |
Raju K.,SJEC |
Ojha S.N.,Indian Institute of Technology BHU Varanasi
Transactions of the Indian Institute of Metals | Year: 2015
In the present study the microstructural features, hardness and wear properties of spray formed Al–35Si–4Fe alloy have been compared with that of as-cast alloy. The microstructure of spray formed Al–35Si–4Fe alloy consisted of fine and uniformly distributed Si coexisting with granular Fe containing intermetallic phase in Al matrix. In contrast, the microstructure of as-cast alloy consisted of coarse Si plates and needles of β-Al–Fe–Si phase in Al matrix. The hardness of spray formed alloy was found to be higher than that of as-cast alloy. The dry sliding wear tests at varying load and sliding speed revealed that wear rate and coefficient of friction for spray formed alloy were invariably lower than that of as-cast alloy. The high hardness and wear resistance of spray formed alloy were discussed in the light of its microstructural features and the morphology of worn-out surfaces. © 2015, The Indian Institute of Metals - IIM.
Sargunar P.N.J.,Sa Engg College |
European Journal of Scientific Research | Year: 2012
Problem statement: Emergency Services like homeland security and personal safety are receiving significant attention worldwide, both to ensure the wellbeing of populations and to enhance the quality of the human life. It is important to detect critical situations and recognize dangerous conditions as early as possible, to take appropriate reactions. Natural disasters impart lessons at a very high cost of life and property. Approach: Texture is the term used to characterize the surface of a given phenomenon in an image and it is undoubtedly one of the principal features used in image processing and pattern recognition. Texture classification plays an important role in the interpretation and analysis of terrain image as well as radiographic and microscopic cell images. Results: In this paper, a novel approach for monitoring the surface of the sea using texture analysis is proposed. This proposed work can be applied to prevent the loss when powerful events like earthquake which occurs under the sea, tsunami. Conclusion: The results of the proposed work show that the objective of the paper is fulfilled. © EuroJournals Publishing, Inc. 2012.
The concept of using core Cu nanowires (CuNWs) that are conformally encapsulated by a reducible fugitive material for transparent conducting electrodes (TCEs) with high oxidation stability is presented. By the chemical reaction of an acid with surface oxide and hydroxide, a uniform surface shell layer is readily obtained on each CuNW upon adding lactic acid to the CuNW dispersion. The Cu lactate shell prevents the core CuNW from oxidizing during storage and film formation, enabling the core Cu nanowires to maintain their characteristic optoelectronic properties. Through simple thermal annealing under a nitrogen atmosphere, the Cu lactate shell is easily decomposed to expose the underlying pure Cu, providing an effective way to produce a pure-CuNW-network TCE with a sheet resistance of 19.8 Ω sq−1 and an optical transmittance of 85.5% at 550 nm. The application of the CuNW-based TCE to the transparent top electrode in organometallic halide perovskite solar cells is further demonstrated for the first time, yielding a power-conversion efficiency 9.88% as compared to that of 13.39% for conventional perovskite solar cells with an indium–tin-oxide electrode. This study proposes the high feasibility of these CuNWs as a vacuum-free and noble-metal-free transparent-window electrode in perovskite solar cells.