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Search Results: 1 - 10 of 198422 matches for " N. LAKSHMANA SWAMY "
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Effect of Included Angle in V-Groove Butt Joints on Shrinkages in Submerged Arc Welding Process
International Journal of Engineering Science and Technology , 2012,
Abstract: The problems of distortion, residual stresses and reduced strength of structure in and around a welded joint are of major concern in the shipbuilding industry and in other similar manufacturing industries. The predictions of the degree of shrinkages in ship panels due to welding are of great importance from the point of view of dimensional control and it is important to analyze transverse and longitudinal shrinkage. This paper deals with the experimental analysis of transverse and longitudinal shrinkage in single and double V-groove butt joints in submerged arc welding by varying included angle and keeping process parameters constant. It is found that, the maximum shrinkage was at the centre of the plate and minimum at the ends. It is also found that, the transverse and longitudinal shrinkage increase with increase in the included angle. There is a significant increase in the transverse shrinkage and small variation in longitudinal shrinkage.
Influence of Groove Angle in V-groove Butt joints on Transverse shrinkage in CO2 Arc Welding process
B. N. Sathyanarayana Reddy,N. Lakshmana Swamy
International Journal of Engineering Science and Technology , 2013,
Abstract: Welding induces transverse shrinkages in welded structures that results in reduced strength of welded joints in manufacturing industries. The analysis of transverse shrinkages is important in point of view of performance of welded joints. In view of this of experimental analysis of transverse shrinkage in single and double V-groove butt welded joints by varying groove angle and keeping heat input constant in CO2 Arc Welding process. It is observed that, the maximum transverse shrinkage increases with increase in the included angle.
International Journal of Engineering Science and Technology , 2012,
Abstract: The objective of this paper is to obtain an optimal setting of urning parameters (Cutting speed, Feed and Depth of Cut) which results in an optimal value of Surface Roughness while machining Al 6351-T6 alloy with Uncoated Carbide Inserts. Several statistical modelling techniques have been used to generate models includingGenetic Algorithm, Response Surface Methodology. In our study, an attempt has been made to generate a model to predict Surface Roughness using Regression Technique. Also an attempt has been made to optimize the process parameters using Taguchi Technique. S/N ratio and ANOVA analysis were also performed to obtain significant factors influencing Surface Roughness
Study of lipid profile, serum magnesium and blood glucose in hypertension
N Lakshmana Kumar
Biology and Medicine , 2010,
Abstract: An attempt was made to study the role of lipid profile serum Mg+2, and blood glucose in hypertension individuals.Moreover, all the parameters are analyzed biochemically. In about 80 samples (50cases and 30 controls) and it isobserved that dyslipidemia is seen in Hypertensive individuals with no change in HDL concentration. There is nocorrelation of serum magnesium in hypertensive cases with controls. It has been observed that serum magnesium ofhypertensive cases is slightly higher than that of normal individuals. Fasting blood glucose of hypertensive cases(101.62mg/dl ±33.78) is higher than that of Controls (82.46 mg/dl±10.8). This increase is statistically significant(p<0.001). But this increase may be due to the presence 12% diabetic cases present in the cases. Even then, there isa tendency of developing impaired glucose tolerance in hypertensive subjects. The blood pressure is notedseparately as systolic blood pressure and diastolic blood pressures. The systolic blood pressure was more significantthan the diastolic blood pressure with increasing age groups.
Rectangular Microstrip Patch Antenna Using Air as Substrate for S-Band Communication  [PDF]
Manish Gupta, Saurabh Sachdeva, N. Kumar Swamy, Inder Pal Singh
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2014, DOI: 10.4236/jemaa.2014.63006

A Rectangular Microstrip Patch Antenna model is proposed using air as a substrate to study the characteristics of designed antenna. The dimensions of designed antenna are 17 mm × 16.66 mm with substrate at frequency 3.525 GHz. In this paper, the simulation is performed by using software Computer Simulation Technology (CST) Microwave studio based on finite difference time domain technique. The characterization of the designed antenna was analyzed in terms of return loss, bandwidth, directivity, gain, radiation pattern, VSWR.

A Comparison of Integer Cosine and Tchebichef Transforms for Image Compression Using Variable Quantization  [PDF]
Soni Prattipati, M. N. S. Swamy, Pramod K. Meher
Journal of Signal and Information Processing (JSIP) , 2015, DOI: 10.4236/jsip.2015.63019
Abstract: In the field of image and data compression, there are always new approaches being tried and tested to improve the quality of the reconstructed image and to reduce the computational complexity of the algorithm employed. However, there is no one perfect technique that can offer both maximum compression possible and best reconstruction quality, for any type of image. Depending on the level of compression desired and characteristics of the input image, a suitable choice must be made from the options available. For example in the field of video compression, the integer adaptation of discrete cosine transform (DCT) with fixed quantization is widely used in view of its ease of computation and adequate performance. There exist transforms like, discrete Tchebichef transform (DTT), which are suitable too, but are potentially unexploited. This work aims to bridge this gap and examine cases where DTT could be an alternative compression transform to DCT based on various image quality parameters. A multiplier-free fast implementation of integer DTT (ITT) of size 8 × 8 is also studied, for its low computational complexity. Due to the uneven spread of data across images, some areas might have intricate detail, whereas others might be rather plain. This prompts the use of a compression method that can be adapted according to the amount of detail. So, instead of fixed quantization this paper employs quantization that varies depending on the characteristics of the image block. This implementation is free from additional computational or transmission overhead. The image compression performance of ITT and ICT, using both variable and fixed quantization, is compared with a variety of images and the cases suitable for ITT-based image compression employing variable quantization are identified.
Electrochemical studies of certain 1-(Toluenyl sulfonyl)-3-amino-4-(4'-substituted aryl hydrazono)-2-pyrazolin-5-ones
Kumar Kakarla,Ramana; Prasad Aluru,Raghavendra Guru; Vinnakota,Srilalitha; Swamy Golla,Narayana; Rao Krishna Rao,Ravindranath Lakshmana;
Revista Colombiana de Química , 2011,
Abstract: the electrochemical behavior of certain 1-(toluenyl sulfonyl)-3-amino-4-(4'-substituted aryl hydrazono)-2-pyrazolin-5-ones were studied at the dropping mercury electrode by employing dc polarography. the variables that influence the electrode process were extensively studied. all compounds under investigation gave two well-defined polarographic waves. the mechanism for the electrode process was proposed in acid as well as in basic media.
Performance Improvement of a Centrifugal Compressor by Passive Means
N. Sitaram,S. M. Swamy
International Journal of Rotating Machinery , 2012, DOI: 10.1155/2012/727259
Abstract: The present experimental investigation deals with performance improvement of a low-speed centrifugal compressor by inexpensive passive means such as turbulence generator placed at different positions and partial shroud near the rotor blade tip. The experiments are carried out at three values of tip clearance, namely 2.2%, 5.1%, and 7.9% of rotor blade height at the exit. Performance tests are carried out for a total of 13 configurations. From these measurements, partial shroud is found to give the best performance. The improvement in the compressor performance may be due to the reduction of tip leakage flows by the small extension of partial shroud (2?mm on the pressure surface side). Although there is nominal change in performance due to turbulence generator (TG), TG has beneficial effect of increased operating range. 1. Introduction The centrifugal compressors have a wide range of applications especially for power plants for small aircraft and helicopters, in process industries, compression of gases and vapours, and refrigeration, because they can provide high-pressure ratios and large operating ranges with relatively high efficiencies. Centrifugal compressors are used primarily for their suitability for handling small volume flows, but other advantages include a shorter length than an equivalent axial flow compressor, less susceptibility to loss of performance by buildup of deposits on the blade surfaces, and their suitability to operate over a wide range of mass flow. The efficiency of a centrifugal compressor is lower than that of an axial flow compressor. Efficiency is probably the most important performance parameter for turbomachines. The conditions of flow in the tip region of rotor blades are very complex due to strong interaction of the leakage flow with the boundary layers and secondary flows. The tip leakage flow thus would have dominant effect on the performance of a compressor. A comprehensive review of tip clearance effects in centrifugal compressors is given by Pampreen [1]. Senoo and Ishida [2] gave analytical expression to quantify the tip clearance effects in centrifugal blowers. Senoo [3] gave a comprehensive review of mechanics of tip leakage flows in axial and centrifugal compressors. Ishida et al. [4] had tested centrifugal blowers with different shapes (square, round, and E-type, i.e., with an extension on the pressure surface side) and found that E-type tip provided improved performance. The concept of partial shrouded rotor in a small high-speed high-pressure ratio centrifugal compressor was computationally investigated by
Computational Identification of Putative miRNAs from Felis Catus
Ganesh Sathyamurthy and N. Ramachandra Swamy
Biomedical Engineering and Computational Biology , 2012, DOI: 10.4137/BECB.S5233
Abstract: microRNAs represent a class of noncoding small RNAs of approximately 20–23 nt length, which are evolutionarily conserved and play a vital role in various biological processes by either degrading or repressing mRNA translation. The Felis catus (cat) genome sequence has been published, and just revealed the number of miRNAs in the genome—without mention of any further details on these miRNAs. This paper discusses an in silico comparative approach using all known sequences of vertebrate pre-miRNA as query sequence, and report 405 putative miRNAs from cat genome. We determine the identity values of pre-miRNAs and mature miRNAs besides statistical sequence characteristics. Interestingly, among 405 miRNAs—90, 53 and 50 showed 100% identity to cattle, human and dog, respectively. Further, we have validated 6 miRNAs, whose identity are ,85% with the query sequence and validated them using MiPred algorithm. We also identify 25 miRNA clusters in cat based on their homologs in other vertebrates. Most importantly, based on identities among pre-miRNA, mature miRNA, miRNA families and clusters, we observe that miRNAs from cat are more identical to cattle, than humans. Our results, therefore may add a new dimension to the studies related to the evolution of cat.
Computational Identification and Characterization of Putative miRNAs in Nasonia Species
Ganesh Sathyamurthy and N. Ramachandra Swamy
International Journal of Insect Science , 2012, DOI: 10.4137/IJIS.S4197
Abstract: MicroRNAs are important at post transcriptional regulation in eukaryotes. Nasonia genus is becoming increasingly popular model in present days due to genetic advantages it possesses over Drosophila. Nasonia species are found distributed throughout the world, expect for N. longicornis, and N. giraulti. In this study, we use the sequential method of blasting all known invertebrate miRNA genes against the Nasonia vitripennis, Nasonia longicornis, and Nasonia giraulti genomes. We identify 40, 31 and 29 putative pre-miRNAs and mature sequences in N. vitripennis, N. giraulti and N. longicornis respectively. A cross species comparison of putative miRNA sequences and their statistical characteristics reveals that there are no huge differences between the species, except for few miRNAs which are reported. We also find that the minimal folding energy index for three Nasonia species pre-miRNA’s average is around 0.85 ± 0.11. Further, we report that U is predominant at the 5` end of mature sequence, which being a typical characteristic of plant miRNAs. Using MiRanda, we predict nearly 471 potential sites in the N. vitripennis genome. Thus concluding our study to be the beginning of understanding the Nasonia’s non coding RNAs and may play an important role in effective pest management in near future.
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