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Usmani A.,Engineers India Ltd | Kannan G.,Engineers India Ltd | Nanda A.,Engineers India Ltd | Mandal A.,VNIT Nagpur
Practice Periodical on Structural Design and Construction | Year: 2016

In underground crude oil storage facilities, concrete plugs are mainly required to contain crude oil inside caverns and are designed as gas-tight to prevent movement of any oil or vapor across the tunnel, either in a horizontal or vertical direction. Plugs are retained in a key excavated in the rock surface, which provides sufficient bearing to the concrete mass under sustained loading conditions. Construction of plugs involves mass concreting under the typically hot and humid conditions found in underground construction. Therefore, the construction of plugs requires an engineering design that takes into account not only design loads and reinforcement, but also the systematic cooling arrangement and efficient grouting mechanism so that the basic purpose of the plug design is not defeated. This paper discusses the design and construction aspects involved in the construction of large tunnel and shaft plugs for an underground crude oil storage project. © 2015 American Society of Civil Engineers.

Sutar R.G.,University of Mumbai | Kothari A.G.,VNIT Nagpur
Proceedings - 2012 International Conference on Communication, Information and Computing Technology, ICCICT 2012 | Year: 2012

Electrocardiogram (ECG) is a popular non invasive test which records the electrical activity of the heart. Cardiac hypertrophy is an adaptive morphological response of the heart to the work overload and is an important risk factor for myocardial infarction, congestive heart failure and sudden death. P wave and T wave changes along-with rise in QRS complex are some of the indications of Hypertrophy. To design intelligent diagnostic system automatic detection of cardiac hypertrophy is an important landmark. This paper illustrates the algorithm to detect cardiac hypertrophy by analyzing ECG signal. MIT-BIH database and MATLAB software has been used for carrying out experimental analysis. © 2012 IEEE.

Iqbal J.,Birla Institute of Technology | Gorai A.K.,Birla Institute of Technology | Katpatal Y.B.,VNIT Nagpur | Pathak G.,Birla Institute of Technology
International Journal of Environmental Science and Technology | Year: 2015

Groundwater is one of the main sources of drinking water in Ranchi district and hence its vulnerability assessment to delineate areas that are more susceptible to contamination is very important. In the present study, GIS-based fuzzy pattern recognition model was demonstrated for groundwater vulnerability to pollution assessment. The model considers the seven hydrogeological factors [depth to water table (D), net recharge (R), aquifer media (A), soil media (S), topography (T), impact of vadose zone (I), and hydraulic conductivity (C)] that affect and control the groundwater contamination. The model was applied for groundwater vulnerability assessment in Ranchi district, Jharkhand, India and validated by the observed nitrate concentrations in groundwater in the study area. The performance of the developed model is compared to the standard DRASTIC model. It was observed that GIS-based fuzzy pattern recognition model have better performance than the standard DRASTIC model. Aquifer vulnerability maps produced in the present study can be used for environmental planning and predictive groundwater management. Further, a sensitivity analysis has been performed to evaluate the influence of single parameters on aquifer vulnerability index. © 2014, Islamic Azad University (IAU).

Kurhekar M.,VNIT Nagpur | Deshpande U.,VNIT Nagpur
Advances in Bioinformatics | Year: 2016

Modeling of stem cells not only describes but also predicts how a stem cell's environment can control its fate. The first stem cell populations discovered were hematopoietic stem cells (HSCs). In this paper, we present a deterministic model of bone marrow (that hosts HSCs) that is consistent with several of the qualitative biological observations. This model incorporates stem cell death (apoptosis) after a certain number of cell divisions and also demonstrates that a single HSC can potentially populate the entire bone marrow. It also demonstrates that there is a production of sufficient number of differentiated cells (RBCs, WBCs, etc.). We prove that our model of bone marrow is biologically consistent and it overcomes the biological feasibility limitations of previously reported models. The major contribution of our model is the flexibility it allows in choosing model parameters which permits several different simulations to be carried out in silico without affecting the homeostatic properties of the model. We have also performed agent-based simulation of the model of bone marrow system proposed in this paper. We have also included parameter details and the results obtained from the simulation. The program of the agent-based simulation of the proposed model is made available on a publicly accessible website. © 2016 Manish Kurhekar and Umesh Deshpande.

Sapate S.G.,VNIT Nagpur | Selokar A.,VNIT Nagpur | Garg N.,Diffusion Engineers Ltd
Materials and Design | Year: 2010

Wear by slurry abrasion is a potential problem in engineering components subjected to particulate flow. The life of the components under slurry abrasive wear situations is primarily decided by operating conditions and the materials properties. Martensitic steels are widely used for abrasion resistant applications. The present work reports slurry abrasion response of hardfacing martensitic steel under a wide range of experimental conditions. The response data is generated using systematic and simultaneous variation of test parameters. The experiments were performed using silica sand slurry with different slurry concentration, particle size, sliding distance and load. The results of the investigation suggest that slurry concentration had relatively stronger effect than normal load. The wear volume loss exhibited an increasing trend with increasing severity of test parameters. An empirical equation is proposed to describe the interactive effect of the test parameters, abrasive particle properties and material property. SEM (Scanning Electron Microscope) studies revealed different morphology of the worn surfaces which was attributed to mild to severe slurry abrasion test conditions. © 2010 Elsevier Ltd.

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