VNIT

Nāgpur, India
Nāgpur, India

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Gupta D.,VNIT | Anand R.S.,Indian Institute of Technology Roorkee
Biomedical Signal Processing and Control | Year: 2017

Ultrasound imaging is one of the most widely used and the cheapest diagnostic tools of medical imaging modalities. In this paper, a hybrid approach for accurate segmentation of the ultrasound medical images is presented that utilizes both the features of kernel fuzzy clustering with spatial constraints and edge based active contour method using distance regularized level set (DRLS) function. The result obtained from the kernel fuzzy clustering is utilized not only to initialize the curve that spreads to identify the estimated region or object boundaries, but also helps to estimate the optimal parameters, which are responsible for controlling the level set evolution. The DRLS formulation also increase the processing speed by removing the need of re-initialization of the level set function. The performance of the proposed method is evaluated by conducting the several experiments on both the synthetic and real ultrasound images. Experimental results show that the proposed method improves the segmentation accuracy and also produces better results by successfully segmenting the object boundaries compared to others. © 2016 Elsevier Ltd


Raut S.P.,VNIT | Ralegaonkar R.V.,VNIT | Mandavgane S.A.,VNIT
Construction and Building Materials | Year: 2011

Accumulation of unmanaged industrial or agricultural solid waste especially in developing countries has resulted in an increased environmental concern. Recycling of such wastes as a sustainable construction material appears to be viable solution not only to pollution problem but also an economical option to design of green buildings. In view of utilization of industrial and agricultural waste material for developing sustainable construction material, the present paper reviews various waste materials in different compositions that were added to the raw material at different levels to develop waste-create bricks (WCB). Various physico-mechanical and thermal properties of the bricks incorporating different waste materials are reviewed and recommendations are suggested as the outcome of the study. The reviewed approach for the design and development of WCB using industrial solid waste is useful to provide a potential sustainable solution. © 2011 Elsevier Ltd. All rights reserved.


Ralegaonkar R.V.,VNIT | Gupta R.,Civil Engineering Group
Energy Education Science and Technology Part A: Energy Science and Research | Year: 2010

Due to the increase in living standard and demand, energy conservation has become important in industrialized countries. In view of rational use of energy, the present paper reviews intelligent building construction with the aid of passive solar architecture approach, which makes use of specific building design principles and reduces the artificial energy requirements for achieving indoor thermal comfort. As a climate responsive architecture, building design criteria has been studied with the help of several parameters like geographic location and climatic conditions, building shape, orientation, selection of construction materials, building openings viz. windows, selection of suitable sunshades, etc. All the salient building design parameters are studied and important findings and recommendations are suggested as the outcome of the study. The study in turn is useful for various resource persons involved in the construction activities for designing energy efficient intelligent buildings.


Ralegaonkar R.V.,VNIT | Gupta R.,Civil Engineering Group
Renewable and Sustainable Energy Reviews | Year: 2010

Due to the increase in living standard and demand, energy conservation has become important in industrialized countries. In view of rational use of energy, the present paper reviews intelligent building construction with the aid of passive solar architecture approach, which makes use of specific building design principles and reduces the artificial energy requirements for achieving indoor thermal comfort. As a climate responsive architecture, building design criteria has been studied with the help of several parameters like geographic location and climatic conditions, building shape, orientation, selection of construction materials, building openings viz. windows, selection of suitable sunshades, etc. All the salient building design parameters are studied and important findings and recommendations are suggested as the outcome of the study. The study in turn is useful for various resource persons involved in the construction activities for designing energy efficient intelligent buildings. © 2010 Elsevier Ltd.


Dakwale V.A.,VNIT | Ralegaonkar R.V.,VNIT | Mandavgane S.,VNIT
Sustainable Cities and Society | Year: 2011

Buildings are major consumers of energy throughout their life cycle. Generation of energy primarily depends on conventional sources, which is the basic cause of environmental pollution. To improve environmental performance of building it is essential to involve all parameters which control its energy efficiency. Present paper identifies various parameters, viz. regulatory and voluntary policies, rating systems to assess energy efficiency, selection of energy efficient processes and materials through life cycle analysis and simulation and shifting to low embodied energy materials. A close control over each stage of development of a building is essential in the process of improvement in energy efficiency and reduction in carbon emission. In the following review construction of a building is divided in planning phase, designing phase, execution phase and operating phase. Policy makers, architects, structural designers, energy managers, construction managers and consultants must be involved in the development of a building for improving its overall environmental performance. © 2011 Elsevier B.V. All rights reserved.


Vincent S.,V.N.I.T. | Murty B.S.,Indian Institute of Technology Madras | Kramer M.J.,Iowa State University | Bhatt J.,V.N.I.T.
Materials and Design | Year: 2015

Partially vitrified Zr60Cu10Al15Ni15 bulk metallic glass has been synthesized using water cooled copper mold drop casting technique. Kinetically favorable microstructures having different morphologies are observed throughout the volume of the bulk metallic glass sample. X-ray diffraction studies indicate formation of hard intermetallic compounds such as Zr3Al2 and Zr2Ni in certain regions along with amorphous structures. Microindentation studies carried out in different regions of the sample reveal microstructure dependent deformation behavior. Highest hardness is observed in the fully crystallized regions compared to pure glassy regions in the same sample. Further nanoindentation in the same sample is used to understand dynamic mechanical properties of microstructures in different regions. The pile-up morphologies around the indent and differences in load-displacement curves provide vital information on deformation behavior of sample in different microstructure sensitive regions. © 2014 Elsevier Ltd.


Kushwaha D.K.,VNIT | Kane P.V.,VNIT
International Journal of Industrial Ergonomics | Year: 2016

Ergonomics plays vital role to improve health and productivity at workplace and in last two decades it find importance to redesign workplace. All Indian industries had taken initiative to redesign their workplace to overcome various musculoskeletal disorders (MSD) and work related injuries. In this context, the project has been carried out in an integrated steel plant located in central India where most of the crane operator was continuously suffering from muscular pain in different body parts. Risk of MSD was identified by detailed questionnaire from 27 crane operator. It was revealed that almost all crane operators were continuously suffering from some kind of MSD. Based on the anthropometric data of 50 percentile Indian male, ergonomic assessment, redesign and evaluation of crane cabin was carried out in CATIA-V5 software. To check the compatibility of the design, rapid upper limb assessment (RULA) for both existing as well as modified crane cabin was performed. This study shows that intervention of ergonomics in workplace reduces the mismatch between man and machine and makes workplace comfortable for work. © 2015 Elsevier B.V.


This paper presents an approach to establish the model for predicting the steady-state erosion rate of polyetherimide and its glass fiber composites. Three-factor and two-level, face-centered composite design is used for experimentation. The parameters which affect the erosion rate are selected as glass fiber percentage (0-40%), impingement angle (30 deg-90 deg), and impact velocity (30-90 m/s). Response surface methodology is used to derive second-order quadratic model with interactions. Investigation showed all the parameters have significant effect on controlling steady-state erosion rate of these composites. The interactions of impact velocity-fiber percentage and impact velocityimpingement angle are significant. The increase in erosion rate with the increase in impact velocity is found to be satisfying a power law. Maximum erosion rate for these composites found at around 45 deg-60 deg impingement angle indicates their semiductile erosion behavior. Scanning electron microscopy photographs indicate ploughing, microcutting, development of cracks, and exposure of fibers as the dominating erosion mechanisms for these composites. Copyright © 2015 by ASME.


Raut S.P.,VNIT | Sedmake R.,VNIT | Dhunde S.,VNIT | Ralegaonkar R.V.,VNIT | Mandavgane S.A.,VNIT
Construction and Building Materials | Year: 2012

Recycle paper mills (RPM) contribute 30% of total pulp and paper mill segment in India. With 85% average efficiency of RPM, 5% waste (RPMW) is produced annually. RPMW which otherwise is land filled has been utilized to make construction bricks that serves a purpose of solid waste management, new revenue generation and earning carbon credits. RPMW-cement combination low carbon foot print bricks with varying composition of cement (0-20% wt) have been prepared and tested as per ASTM C 67-03a standards. RPMW has been characterized using X-ray fluorescence (XRF), thermogravimetric and differential thermal analysis (TG-DTA), X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). TG-DTA confirms thermal stability till 280 °C whereas SEM monographs show the pores and fibrous nature. From experimentation it is observed that waste-create bricks (WCB) prepared using RPMW-cement combination is light weight, shock absorbing and meets compressive strength requirements of ASTM C 67-03a. The brick making procedure being simple can be undertaken as rural entrepreneurship by unskilled labors of developing countries. © 2011 Elsevier Ltd. All rights reserved.


Madurwar M.V.,VNIT | Ralegaonkar R.V.,VNIT | Mandavgane S.A.,VNIT
Construction and Building Materials | Year: 2013

The rapid urbanisation is creating a shortfall of conventional building construction materials due to limited availability of natural resources. On the other hand energy consumed for the production of conventional building construction materials pollutes air, water and land. In order to meet the ever increasing demand for the energy efficient building construction materials there is a need to adopt cost effective, environmentally appropriate technologies and upgrade traditional techniques with available local materials. Agro-industrial and other solid waste disposal is another serious issue of concern in developing countries. The present paper explores the potential application of agro-waste as the ingredient for alternate sustainable construction materials. Based on the availability of agro-waste materials, sustainable construction materials are evaluated for their physico-mechanical properties, methods of production and environmental impact. The application of agro-waste for sustainable construction materials provides a solution which offers reduction in natural resource use as well as energy. © 2012 Elsevier Ltd. All rights reserved.

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