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Vidisha, India

Purushottam,R.A.U.M. | Saxena K.,SATI | Sharma R.,Amity University
International Conference on Computing, Communication and Automation, ICCCA 2015

Cardiovascular disease (CVD) is a big reason of morbidity and mortality in the current living style. Identification of Cardiovascular disease is an important but a complex task that needs to be performed very minutely, efficiently and the correct automation would be very desirable. Every human being can not be equally skillful and so as doctors. All doctors cannot be equally skilled in every sub specialty and at many places we don't have skilled and specialist doctors available easily. An automated system in medical diagnosis would enhance medical care and it can also reduce costs. In this study, we have designed a system that can efficiently discover the rules to predict the risk level of patients based on the given parameter about their health. The rules can be prioritized based on the user's requirement. The performance of the system is evaluated in terms of classification accuracy and the results shows that the system has great potential in predicting the heart disease risk level more accurately. © 2015 IEEE. Source

Samal M.K.,Bhabha Atomic Research Center | Balakrishnan K.S.,Bhabha Atomic Research Center | Parashar J.,SATI | Tiwari G.P.,Bhabha Atomic Research Center | Anantharaman S.,Bhabha Atomic Research Center
Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science

Determination of transverse mechanical properties from the ring type of specimens directly machined from the nuclear reactor pressure tubes is not straightforward. It is due to the presence of combined membrane as well as bending stresses arising in the loaded condition because of the curvature of the specimen. These tubes are manufactured through a complicated process of pilgering and heat treatment and hence, the transverse properties need to be determined in the as-manufactured condition. It may not also be possible to machine small miniaturized specimen in the circumferential direction especially in the irradiated condition. In this work, we have performed ring-tensile tests on the un-irradiated ring tensile specimen using two split semi-cylindrical mandrels as the loading device. A three-dimensional finite element analysis was performed in order to determine the material true stress-strain curve by comparing experimental load- displacement data with those predicted by finite element analysis. In order to validate the methodology, miniaturized tensile specimens were machined from these tubes and tested. It was observed that the stress-strain data as obtained from ring tensile specimen could describe the load-displacement curve of the miniaturized flat tensile specimen very well. However, it was noted that the engineering stress-strain as directly obtained from the experimental load- displacement curves of the ring tensile tests were very different from that of the miniaturized specimen. This important aspect has been resolved in this work through the use of an innovative type of 3-piece loading mandrel. © IMechE 2012. Source

Samal M.K.,Bhabha Atomic Research Center | Balakrishnan K.S.,Bhabha Atomic Research Center | Parashar J.,SATI | Tiwari G.P.,Bhabha Atomic Research Center
Transactions of the Indian Institute of Metals

Specimens machined in the form of circular rings directly from the nuclear reactor pressure tubes and tested in a ring-tension test-setup offer great simplicity in evaluating the transverse mechanical properties of the as-manufactured as well as those of the service-exposed tubes. However, the state of stress in the specimen cross-section is not purely uni-axial due to the effect of bending and the presence of lateral pressure due to the loading mandrel. This requires the use of 3-D finite element (FE) analysis for simulation of deformation behavior of the specimens in the ring-tension test-setup. In this work, we have analyzed the deformation behavior of ring-tension specimens machined from two different types of zirconium alloy pressure tubes as used in the Indian pressurized heavy water reactors. The effect of geometry of the loading mandrel (i.e., 2-piece vs. 3-piece type of mandrel) on the load-deformation behavior of the test-setup has been studied. It was observed that the values of maximum load as well as the deformation behavior in the post-necking region differ significantly when only the geometry of the loading mandrel is changed keeping all the other parameters same. FE analysis has been able to correctly predict these variations as it takes into account of the effect of geometry, material properties as well the interaction between the mandrel and the specimen. Hence, the use of FE method is essential in the inverse analysis procedure where the material properties can be determined from these complex test-setups. © 2013 Indian Institute of Metals. Source

Pandey G.S.,RGPV | Jain R.C.,SATI
Proceedings of the 2014 International Conference on Advances in Computing, Communications and Informatics, ICACCI 2014

The protein structure has always been under significant exploration, as this is vitally responsible for the basic functionality. Understanding the formation of these structures has gradually been called as 'the protein folding problem'. The solution for this problem is basically concerned with the ultimate aim to attain the native state. Broadly the methods to predict the ultimate goal, are categorized as- the template -based (homology modeling, threading/fold recognition) and template -free (ab initio) methods, which are discussed later in detail. In this paper, we have followed the ab initio methodology, to develop an ARTNN based approach to cluster the stable folds, out of the search space. The approach implemented through either of the two models (SF-ART or FC-ART model) could help enhance the performance of obtaining the three dimensional native state by providing more productive pathway, using the crude ab initio parameters, emphasizing quality performance with reduced execution time. This could thus be considered as a productive ab initio- clustering approach. © 2014 IEEE. Source

Balakrishnan K.S.,Bhabha Atomic Research Center | Samal M.K.,Bhabha Atomic Research Center | Parashar J.,SATI | Tiwari G.P.,Bhabha Atomic Research Center | Anatharaman S.,Bhabha Atomic Research Center
Transactions of the Indian Institute of Metals

The integrity assessment of nuclear reactor pressure tubes (PTs) used in pressurized heavy water reactors necessitates the determination of their tensile property data. This in turn will require the employment of appropriate specimens that can be fabricated from them. If this is to be done on the material in the irradiated condition it will be essential to resort to sub-size or miniature sized specimens which need to be designed and tested to prove its efficacy in providing the correct output. With this aim in view two different sheet type tensile specimens were designed for estimating the tensile property data of both axial and circumferential directions of the PT. As the raw material was in the form of tube, sheath type tensile specimens with 25 mm gauge length and having the full thickness of the tube were designed for axial direction of the PT as per the broad guidelines of ASTM Std. A370 and tested as per ASTM Std. E8. Thus the output generated from the axial sheath tensile specimens would serve the purpose of providing standard and reliable tensile property data of the material and that too at the component level. The data from the axial sheet tensile specimens were found to match very well when compared with those from the sheath specimens thus proving not only the veracity of the data but also the transferability of such data from miniature specimens to that at the component level. Hence, sheet tensile specimens prepared in the circumferential direction of the PT alone were utilized to obtain the transverse tensile property data of the PT. This approach was employed in the case of both Zr-2 and Zr-2.5 % Nb PTs in the un-irradiated condition. © 2013 Indian Institute of Metals. Source

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