NIT Trichy

Tamil Nadu, India

NIT Trichy

Tamil Nadu, India

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Bahurudeen A.,Indian Institute of Technology Madras | Marckson A.V.,Sathyabama University | Kishore A.,NIT Trichy | Santhanam M.,Indian Institute of Technology Madras
Construction and Building Materials | Year: 2014

Sugarcane bagasse ash is a by-product from sugar industries and can be used as supplementary cementitious material in concrete. The development of new cementitious blends with processed sample of sugarcane bagasse ash is described in this paper. Utilization of various supplementary cementitious materials significantly influences fresh and hardened properties of concrete. Interaction of pozzolanic material with cement and chemical admixtures produces diverse effects in the fresh properties of blended cement concrete. This paper aims to ascertain the effect of different bagasse ash replacements of cement on the compatibility with superplasticizers in cement paste. Sugarcane bagasse ash based Portland pozzolana cements were produced with three different levels of replacement - 10%, 15%, and 20%. Marsh cone and mini-slump test were used to determine the effect of superplasticizer type and water binder ratio on the saturation dosage. From this study, it was observed that polycarboxylic ether based superplasticizer was more compatible with bagasse ash blended cement than sulphonated naphthalene based superplasticizer. © 2014 Elsevier Ltd. All rights reserved.


Anand R.,National Institute of Technology Tiruchirappalli | Kannan G.R.,NIT Trichy | Nagarajan S.,NIT Trichy | Velmathi S.,NIT Trichy
SAE Technical Papers | Year: 2010

Waste cooking oil methyl ester (WCO-ME) is produced by the transesterification of waste cooking oil (WCO) on laboratory scale setup and it can be used as a biodiesel in stationary diesel engine. The proceeding study investigates the effect of biodiesel and its blends varying from B10 to B80 on the engine performance, emission and combustion characteristics. The properties of diesel and biodiesel are examined and compared. The experimental results show that the use of WCO-ME in an unmodified direct injection diesel engine has yielded higher brake specific fuel consumption (BSFC) due to low calorific value. It is also observed that at full load the brake specific energy consumption of biodiesel blends are higher than that of diesel. Further, biodiesel blends show a reduction in emission properties such as carbon monoxide (CO), carbon dioxide (CO2), unburnt hydrocarbon (UHC) and smoke opacity with slight increase in nitric oxide (NO) emission compared to diesel at full load. Overall combustion characteristics for all blends are found to be quite similar to that of diesel. Hence, the WCO-ME is a promising diesel fuel substitute that can be produced by recycling waste cooking oil without any engine modification and furthermore, becoming less dependent on fossil oil imports thereby decreasing the environmental pollution. Copyright © 2010 SAE International.


Subramanian S.,NIT Trichy | Pradhan A.K.,Indian Institute of Technology Madras | Thangaraj A.,Indian Institute of Technology Madras
2014 20th National Conference on Communications, NCC 2014 | Year: 2014

Low Density Parity Check (LDPC) codes have capacity-approaching performance over several channels of interest. In practice, for good block-error rate performance, the girth of the Tanner graph of an LDPC code needs to be as high as possible. In theory, to show that block-error rate approaches zero for increasing block-lengths, the girth of the Tanner graph sequence needs to tend to infinity with block-length. To meet these requirements, we construct sequences of large-girth irregular LDPC codes for a given degree-distribution pair (DDP) by applying a general node splitting algorithm on large girth graphs. The obtained Tanner graph meets the required DDP up to a suitable approximation. By optimizing the node-splitting method and using suitable large-girth graphs, we show code constructions with smaller block length for the same girth, when compared to previous constructions. Similar gains in block length are observed in the construction of sequences of large-girth protograph LDPC codes. Simulations, over a binary erasure channel, confirm the gains in block-error rate obtained by the large girth construction. © 2014 IEEE.


Mouli P.V.S.S.R.C.,Vellore Institute of Technology | Janakiraman T.N.,NIT Trichy
Communications in Computer and Information Science | Year: 2011

An unsupervised and robust algorithm for segmenting color images using graph theoretic concepts is proposed in this paper. A novel region growing procedure is proposed for cycle (segments) formation and cycle merging. Experiments were carried out on standard Berkeley Segmentation Database Set (BSDS) and other public domain images and the results show the efficacy of the proposed method. © 2011 Springer-Verlag.


Elsen S.R.,NIT Trichy | Ramesh T.,NIT Trichy
International Journal of Refractory Metals and Hard Materials | Year: 2015

In this work the effect of powder forming process parameters of zirconia reinforced alumina composites on micro hardness and compressive strength was studied. The weight percentages of zirconia added to alumina, compaction pressure and sintering temperature are the process parameters selected for this analysis. Using Box-Behnken technique in Response Surface Methodology (RSM), seventeen experimental runs are developed. The sintering temperature and weight percentage of zirconia added to alumina are found to influence the responses. The influencing parameters were identified by using analysis of variance and Grey Relational Analysis (GRA). The regression model for both micro hardness and compressive strength are developed. The increasing amount of zirconia added to alumina matrix is found to enhance the compressive strength of the composite and reduces the hardness of composite. Also, multi response optimization to obtain higher hardness and compressive strength are done using both RSM and GRA. © 2015 Elsevier Ltd. All rights reserved.


Chintagunta S.,NIT Trichy | Palanisamy P.,NIT Trichy
2015 3rd International Conference on Signal Processing, Communication and Networking, ICSCN 2015 | Year: 2015

In this paper, we develop a joint transmit and receive diversity smoothing technique to estimate two dimensional direction-of-arrival (2D-DOA) of coherent targets with electromagnetic vector sensor (EMVS) array elements in multiple input multiple output (MIMO) radar. The DOA estimates are obtained through the estimation of the six components of the EMVS based on subspace based rotational invariance algorithm. It is based on the cross product of the vectors signal's electric-field and the associate magnetic-field, which directly computes the direction cosines of the three-dimensional Cartesian coordinates. The proposed method utilizes the waveform diversity benefit drawn from the coherent MIMO radar. Compared to receive-only spatial smoothing, this scheme has more number of covariance matrices for averaging which reduces the correlation among the coherent targets leading to better estimation results. © 2015 IEEE.


Renold Elsen S.,NIT Trichy | Ramesh T.,NIT Trichy
International Journal of Refractory Metals and Hard Materials | Year: 2016

Shrinkage is an important issue during sintering of ceramics as it affects the structural and mechanical properties. In the current work, the shrinkage characteristics of sintered zirconia toughened alumina (ZTA) compact produced by conventional powder forming process was investigated by using computed tomography imaging technique. The effect of process parameters such as weight percentage of zirconia added to toughened alumina, compaction pressure, and sintering temperature on ZTA was studied. The Box-Behnken technique in response surface methodology was used to develop the experimental design to analyze the shrinkage phenomena. The sintered samples were subjected to computed tomography scan and analyzed by using MIMICS Software wherein the three dimensional shrinkage of the ZTA composites was done. The mathematical regression model relating powder forming process parameters to the shrinkage was developed. It was observed that due to the effect of gravity, shrinkage is found to be 20% in the top for 1600 °C sintered sample. From the study shrinkage of the sintered ZTA was influenced by the sintering temperature. Being a non-contact type digital measurement method the odds of error created by instrument or human was avoided. Shrinkage of three directional complex shapes can also be identified effectively with the help of solid modeling packages. © 2015 Elsevier Ltd.


Elsen S.R.,NIT Trichy | Ramesh T.,NIT Trichy
International Journal of Refractory Metals and Hard Materials | Year: 2016

An experimental investigation of the tribological performance during dry sliding wear was carried out on Zirconia Toughened Alumina (ZTA) ceramic composites. Process parameters for the analysis, such as the amount of Zirconia reinforcement added to alumina matrix, compaction pressure to form the green bodies of required shape and sintering temperature to make the final composite were selected as the control variables. The specific wear rate of ZTA against steel studied using a pin-on-disc method was selected as the response. The tribological experiments were carried out on all the 17 ZTA samples fabricated based on Box-Behnken design. The tribological test parameters such as a constant load of 49.05 N (5 kg) and sliding velocities of 0.3 m/s for a sliding distance of 800 m were kept constant. The regression model was developed for specific wear rate of dry sliding wear and the influential parameters were found to be sintering temperature and weight percentage of Zirconia added to alumina from Analysis of variance (ANOVA). The results concluded that decreasing the amount of Zirconia reinforcement into the alumina matrix and sintering temperature improves the specific wear rate. Also, the High resolution scanning electron microscopy (HR-SEM) analysis was done on the wear tracks to examine the wear mechanism involved. The optimization was done using Response Surface Method and a confirmation test was done to validate the optimized results. © 2016 Elsevier Ltd. All rights reserved.


Kumar N.P.,Vellore Institute of Technology | Arungalai Vendan S.,Vellore Institute of Technology | Siva Shanmugam N.,NIT Trichy
Journal of Alloys and Compounds | Year: 2016

Aluminium alloy sheets are find utility in various diversities of industrial sectors due to its multifunctional features and global suitability. There have been several literatures reporting mechanical and microstructure analysis and suitability of joining of this material using various welding techniques. Subsequently, it has been proved successful for several welding processes irrespective of the heat flow phenomenon. However, the width of heat affected zone remains a challenge for all the conventional processes. In view of this, it is observed that cold metal transfer technique appears to reduce the HAZ width due to its low heat input to the base metal which is the most prominent feature of the process. In this paper, the effect of welding current and welding speed on heat input, depth of penetration, weld pool width, reinforcement height, dilution, weld bead contact angle parameters during cold metal transfer (CMT) process is investigated. The outcome of this research study is expected to provide a thorough insight into the heat input, strength, microstructures of weld zone and integrity of the weldments for different trails of welding current and welding speed which facilitates in determining the optimized parameter range. © 2015 Elsevier B.V.


Kukde A.A.,NIT Trichy | Kumaravel S.,NIT Trichy | Venkataramani B.,NIT Trichy
2014 International Conference on Circuits, Power and Computing Technologies, ICCPCT 2014 | Year: 2014

In wireless receivers, linearity is one of the performance metrics that needs to be addressed while designing LNAs. Modified Derivative Superposition (MDS) technique is one of the methods proposed in the literature to improve linearity. In the literature, Folded Cascode (FC) Low Noise Amplifiers (LNA) are proposed for low voltage and low power Radio Frequency Integrated Circuits (RFIC). In this paper, FC LNA adapting MDS technique (FC-MDS) is designed and implemented using UMC 0.13 μm RFCMOS process to operate at 900 MHz. From the simulation results, it is found that the proposed FC-MDS LNA achieves a Power Gain of 13.7 dB, Noise Figure of 1.1 dB, IIP3 of +7.77 dBm, and the S11 of -27dB. The designed LNA consumes 6.19 mW power. The Figure of Merit of the proposed LNA is higher by a factor of 1.2 to 6.5 than those of other cascode LNAs reported in the literature. © 2014 IEEE.

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