Government College of Technology, Coimbatore
Coimbatore, India

The Government College of Technology, Coimbatore is an autonomous state-funded engineering college located in Coimbatore, Tamil Nadu, India. It is a constituent college of Anna University of Technology, Coimbatore. Wikipedia.

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Suriyanarayanan N.,Government College of Technology, Coimbatore
Physica B: Condensed Matter | Year: 2010

Copper indium disulphide (CuInS2), is a good absorber material for photovoltaic applications. In this work, CuInS2 is deposited by chemical spray pyrolysis on heated glass substrates. It is observed that the film growth temperature and the ion ratio Cu/In affects the structural and optical properties of CuInS2 thin films. This paper presents the effect of temperature on the growth (for the ion ratio Cu/In=1.25), optical and photoluminescence properties of sprayed CuInS2 films. The XRD patterns confirm the well defined single phase composition of CuInS2 films grown from 300 to 350 °C (at Cu/In=1.25) as optimum temperature for depositing well defined crystallites along (1 1 2) oriented CuInS2 thin films with chalcopyrite structure. D2d point symmetry group is associated with the CuInS2 crystallites with energy gap of 1.53 eV at room temperature. The chemical nature and the presence of additional phases are discussed based on the EDAX measurements. The absorption coefficient of sprayed CuInS2 films is found to be in the order of 105-106 cm-1 in the UV-visible region and the optical band gap decreases with increase in temperature. Defects-related photoluminescence properties are also discussed. CuInS2 polycrystalline films are prepared by the cost effective method of spray pyrolysis from the aqueous solutions of copper (II) chloride, indium (III) chloride and thiourea for synthesis on heated glass substrates. © 2010 Elsevier B.V. All rights reserved.

Suriyanarayanan N.,Government College of Technology, Coimbatore
Materials Science and Engineering B: Solid-State Materials for Advanced Technology | Year: 2011

Copper indium disulphide (CuInS2) is an absorber material for solar cell and photovoltaic applications. By suitably doping CuInS2 thin films with dopants such as Zn, Cd, Na, Bi, Sn, N, P and As its structural, optical, photoluminescence properties and electrical conductivities could be controlled and modified. In this work, Sb (0.01 mole (M)) doped CuInS 2 thin films are grown in the temperature range 300-400 °C on heated glass substrates. It is observed that the film growth temperature, the ion ratio (Cu/In = 1.25) and Sb-doping affects the structural, optical and photoluminescence properties of sprayed CuInS2 films.The XRD patterns confirm that the Sb-doping suppresses the growth of CuInS2 polycrystalline thin films along (1 1 2) preferred plane and in other characteristic planes. The EDAX results confirm the presence of Cu, In, S and Sb. About 60% of light transmission occurs in the wavelength range 350-1100 nm. The absorption coefficient (α) is found to be in the order of 10 5 cm-1. The band gap energy increases as the temperature increases from 300-400 °C (1.35-1.40 eV). SEM photographs depict that large sized crystals of Sb-doped CuInS2 (1 μm) are formed on the surface of the films. Well defined sharp blue and green band emissions are exhibited by Sb-doped CuInS2 thin films. Defects-related photoluminescence emissions are discussed. These Sb-doped CuInS2 thin films are prepared by the cost effective method of spray pyrolysis from the aqueous solutions of CuCl2, InCl3, SC(NH2)2 and SbCl3 on heated glass substrates. © 2010 Elsevier B.V. All rights reserved.

Krishna B.V.,Saranathan College of Engineering | Baskaran K.,Government College of Technology, Coimbatore
IET Signal Processing | Year: 2013

Fast signal processing implementation techniques for detection and classification of power quality (PQ) disturbances are the need of the hour. Hence in this work, a parallel computing approach has been proposed to speed up the feature extraction of PQ signals to facilitate rapid building of classifier models. Considering that the Fourier, the one-dimensional discrete wavelet, the time-time and the Stockwell transforms have been used extensively to extract pertinent time-frequency features from nonstationary and multi-frequency PQ signals, acceleration approaches using data and task parallelism have been employed for parallel implementation of the above time-frequency transforms. In the first approach, data parallelism was applied to the Stockwell transform and the time-time transform-based feature extraction methods separately to alleviate capability problems. Also, data parallelism was applied to Fourier and wavelet-based feature extraction methods independently to alleviate capacity problems. Secondly, a combination of task and data parallelism was applied to speed up S-transform based three-phase sag feature extraction. Experiments were conducted using shared-memory and distributed memory architectures to try out the effectiveness of the proposed parallel approaches. The performances of these parallel implementations were analysed in terms of computational speed and efficiency in comparison with the sequential approach. © The Institution of Engineering and Technology 2013.

Senthil P.,Coimbatore Institute of Technology | Amirthagadeswaran K.S.,Government College of Technology, Coimbatore
Journal of Mechanical Science and Technology | Year: 2012

This paper reports a research in which an attempt was made to prepare AC2A aluminium alloy castings of a non symmetrical component through squeeze casting process. The primary objective was to investigate the influence of process parameters on mechanical properties of the castings. Experiments were conducted based on orthogonal array suggested in Taguchi's offline quality control concept. The experimental results showed that squeeze pressure, die preheating temperature and compression holding time were the parameters making significant improvement in mechanical properties. The optimal squeeze casting condition was found and mathematical models were also developed for the process. © 2012 The Korean Society of Mechanical Engineers and Springer-Verlag Berlin Heidelberg.

Vijayakumar S.,Coimbatore Institute of Technology | Ganesan S.,Government College of Technology, Coimbatore
Current HIV Research | Year: 2012

Gold nanoparticles stabilized with polyethylene glycol were used to study their cytotoxicity and antiviral activity against HIV-1 in the laboratory. The HeLa-CD4-LTR-B-gal cell line was used with gold nanoparticles to determine the cell viability using luminescent assay. The 50% cytotoxicity concentration, IC50 of gold nanoparticles was found to be 1.12 ± 0.05 mg/ml. M-tropic, T-tropic, dual tropic and resistant isolates were inhibited by gold nanoparticles and their inhibition concentration ranged from 0.05 to 0.12 mg/ml. The mechanism of gold nanoparticles against HIV-1 is not clear but it inhibits the HIV-1 fusion. In this study, the gold nanoparticles were used to analyze their mode of antiviral activity and the experimental results showed that they inhibit the viral entry by binding with gp120 and prevent CD4 attachment. These properties of gold nanoparticles make them as an effective antiviral inhibitor. © 2012 Bentham Science Publishers.

Govindaraju C.,Salem College | Baskaran K.,Government College of Technology, Coimbatore
IEEE Transactions on Power Electronics | Year: 2011

This paper presents four different sequential switching hybrid-modulation strategies and compared for cascaded multilevel inverters. Hybrid-modulation strategies represent combinations of fundamental-frequency modulation and multilevel sinusoidal-modulation (MSPWM) strategies, and are designed for performance of the well-known alternative phase opposition disposition, phase-shifted carrier, carrier-based space-vector modulation, and single-carrier sinusoidal-modulations. The main characteristic of these modulations are the reduction of switching losses with good harmonic performance, balanced power loss dissipation among the devices with in a cell, and among the series-connected cells. MSPWM and its base modulator design are implemented on a TMS320F2407 digital signal processor (DSP). Complex programmable logic device realizes hybrid-modulation algorithm with base pulsewidth modulation (PWM) circulation, and is integrated with DSP for sequential switching hybrid PWM generation. The proposed modulations can be easily extended to three phase, and higher level inverters, operates with same physical structure of the power module. The feasibility of these hybrid modulations are verified through spectral analysis, power loss analysis, simulation, and experimental results. © 2006 IEEE.

Senthilnathan V.,Kumaraguru College of Technology | Ganesan S.,Government College of Technology, Coimbatore
Journal of Renewable and Sustainable Energy | Year: 2010

In the area of photovoltaic, the silicon solar cell is the most popular and it has issues such as stability and scaling up cost. On the other hand, a dye-sensitized solar cell (DSSC) is one of the most promising candidates for a high-performance solar cell in the next generation, since it is fabricated by a simple manufacture process at relatively low cost. The focus of interest in this research paper is to mention the usage of maiden single and simple apparatus of spray pyrolysis thin film deposition to fabricate the electrode and counterelectrode for DSSC. It involves the novelties introduced in the instrumentation of the apparatus and the characterizations (x-ray diffraction, scanning electron microscope, and atomic force microscopy) of the prepared thin films for the fabricated DSSC. In this work, the pomegranate fruit dye is used to sensitize the nano- TiO2. © 2010 American Institute of Physics.

Vijayakumari A.,Amrita University | Devarajan A.T.,Amrita University | Devarajan N.,Government College of Technology, Coimbatore
International Journal of Electrical Power and Energy Systems | Year: 2012

This paper presents a model based hardware simulator to emulate a photovoltaic (PV) array/module for all operating conditions. For making the model accurate the values of manufacturer dependent parameters pertaining to a PV array are extracted from the published data sheet of the array by a curve fitting based extraction technique. The proposed simulator consists of a microcontroller controlled switched mode DC-DC converter. The mathematical model of the PV array is embedded in the controller with provisions for the user to enter the required ambient conditions. A feedback compensator is implemented to achieve fast response and good stability and to minimize the steady-state error. As a test case to design, develop and test for compliance the published data of 115 W solar panel Shell S115 has been used. The prototype is tested for steady-state and transient conditions. The experimental results of the simulator are presented. The results are compared with the cell characteristics available in literature and compliance is confirmed. © 2012 Elsevier Ltd. All rights reserved.

Ranjithkumar V.,Government College of Technology, Coimbatore | Sangeetha S.,Government College of Technology, Coimbatore | Vairam S.,Government College of Technology, Coimbatore
Journal of Hazardous Materials | Year: 2014

The adsorption of acid yellow 17 dye on activated carbon/α-Fe2O3 nanocomposite prepared by simple pyrolytic method using iron(II) gluconate was investigated by batch technique. The composite was characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM), and vibrating sample magnetometry (VSM). The size of iron oxide nanoparticles formed from iron(II) gluconate precursor is in the range 5-17nm. The saturation magnetization (Ms), remanence (Mr) and coercivity (Hc) of the magnetic carbon nanocomposite is 5.6emu/g, 1.14emu/g and 448Oe, respectively. The adsorption data are found to fit well with Langmuir and, fairly well with Freundlich and Tempkin isotherms at higher concentration of dye (40-100mg/L). Kinetics data indicate that the adsorption of dye follows pseudo-second order kinetics model. © 2014.

Ragesh G.K.,Government College of Technology, Coimbatore | Baskaran K.,Government College of Technology, Coimbatore
Procedia Engineering | Year: 2012

With the increasing use of wireless networks and miniaturization of electronic Devices has allowed the realization of Wireless Body Area Networks (WBANs). It is one of the latest technologies in health care diagnosis and management. WBAN consists of various intelligent bio sensors attached on or implanted in the body like under the skin. These sensors offer promising applications in areas such as real time health monitoring, interactive gaming and consumer electronics. WBAN does not compel the patient to stay in the hospital thereby giving much physical mobility. This paper presents an overview on the various aspects of WBAN.0.

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