78 research outputs found
sj-docx-1-pie-10.1177_09544089211037116 - Supplemental material for A review study on the performance of a parabolic trough receiver using twisted tape inserts
No full textSupplemental material, sj-docx-1-pie-10.1177_09544089211037116 for A review study on the performance of a parabolic trough receiver using twisted tape inserts by Sashank Thapa, Sushant Samir and Khushmeet Kumar in Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering</p
sj-docx-1-pie-10.1177_09544089211059320 - Supplemental material for Performance evaluation of solar parabolic trough receiver using multiple twisted tapes with circular perforation and delta winglet
No full textSupplemental material, sj-docx-1-pie-10.1177_09544089211059320 for Performance evaluation of solar parabolic trough receiver using multiple twisted tapes with circular perforation and delta winglet by Sashank Thapa, Sushant Samir and Khushmeet Kumar in Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering</p
Structural Design of 3-AXIS CNC Machine Tool for Wood Carving
No full textME-CAD/CAM-DissertationWood carving from the ancient time is an attractive work for the decorative purposes and basic pattern demand. Earlier it was done by few skilled labors but from past decade due to increase in demand of items for decoration because of high life style is been done with the help of machine tools. The scenario is totally changed with the invent of CNC machines. As the close tolerance is needed for this purpose CNC machines are best suitable for this work because with the CNC machine this is achieved which add towards the beauty of the carving. In the present work an effort is made to design a wood carving CNC machine which will be optimized side by side while designing. As most of the company manufacturing the CNC wood carving machine does not disclose the procedure of designing so it is difficult to select a machine according to own input parameters. The work done here is having the initial step of study of numerical and empirical relationship required for the selection of various machine tool components followed by setting up the operating parameters which influences the machine tool selection. The standard components are selected against the designed components and the non standard components are selected such that can be easily manufactured. The Analysis of the machine tool components are done in ANSYS to check the deflection which can add towards the tool deflection the main cause for the tool path deviation. So optimization is done to minimize the deflection of machine tool components against its own self weight, cutting forces, long lengths of drives etc. In the present work knowledge of machine design, solid mechanics, strength of material and FEM software is used to do the whole work.MED, Thapar University, Patial
Work motivation factors among call centre employees in India
No full textAbstract
Background: Throughout the history of humankind, the driving influence of motivation in achieving set goals and targets is well established. It is interesting how this primal urge to achieve a target continues to inspire achievement in many modern occupations. The call-centre culture of urban India provides an ideal case-study to investigate just that as employees continue to produce positive results despite the existence of several significant deterrents. This study seeks to explore role of motivation in call-centre employees in India in context of Herzberg’s and Maslow’s theories of motivation.
Methodology: A qualitative approach was followed in this project. A structured self-completion questionnaire was prepared by the author and sent to potential participants. The questionnaire was devised based on the five most important factors- working conditions; financial rewards and fringe benefits; team managers; organizational climate and culture; personal attributes- that have a direct impact on the motivation of the members of the sample. The self-completion questionnaire was sent to 55 call-centre employees out of which there were 34 respondents. The results so obtained were interpreted using appropriate graphs and charts.
Results: The survey revealed that, call-centre employees in India considered Job Security (Total rank score-191), Training (Total rank score-173) and Job Promotion (Total rank score-138) as their top three most important motivational factors. Pay Rate (Total rank score-137), which is generally thought of as being the most important motivating factor, was shown to be considered only as the fourth most important motivating factor. Other factors, namely Work Appreciation (Total rank score-124), Fringe Benefits (Total rank score-94) and Status (Total rank score-67) were revealed to be the fifth, sixth and seventh most important motivational factors respectively. These results along with comparative analyses of different motivating factors have been presented in the form of graphs where appropriate
Work motivation factors among call centre employees in India
No full textAbstract
Background: Throughout the history of humankind, the driving influence of motivation in achieving set goals and targets is well established. It is interesting how this primal urge to achieve a target continues to inspire achievement in many modern occupations. The call-centre culture of urban India provides an ideal case-study to investigate just that as employees continue to produce positive results despite the existence of several significant deterrents. This study seeks to explore role of motivation in call-centre employees in India in context of Herzberg’s and Maslow’s theories of motivation.
Methodology: A qualitative approach was followed in this project. A structured self-completion questionnaire was prepared by the author and sent to potential participants. The questionnaire was devised based on the five most important factors- working conditions; financial rewards and fringe benefits; team managers; organizational climate and culture; personal attributes- that have a direct impact on the motivation of the members of the sample. The self-completion questionnaire was sent to 55 call-centre employees out of which there were 34 respondents. The results so obtained were interpreted using appropriate graphs and charts.
Results: The survey revealed that, call-centre employees in India considered Job Security (Total rank score-191), Training (Total rank score-173) and Job Promotion (Total rank score-138) as their top three most important motivational factors. Pay Rate (Total rank score-137), which is generally thought of as being the most important motivating factor, was shown to be considered only as the fourth most important motivating factor. Other factors, namely Work Appreciation (Total rank score-124), Fringe Benefits (Total rank score-94) and Status (Total rank score-67) were revealed to be the fifth, sixth and seventh most important motivational factors respectively. These results along with comparative analyses of different motivating factors have been presented in the form of graphs where appropriate
Impact of artificial roughness variation on heat transfer and friction characteristics of solar air heating system
No full textThe present study describes the optimization of the spacer length parameter of perforated delta-shaped winglets (PDWs) imposed on the absorber plate of the solar air heater (SAH). An experimental set up is designed to analyze the influence of artificial roughness (AR) variation on the thermo-hydraulic performance of SAH. The variable parameter of the PDWs is the spacer length (Spdw) which varies from0 mm to 300 mm in steps of 100 mm. The impact of variation of Spdw on Nusselt number (Nupdw), friction factor (frpdw) and thermo-hydraulic performance (ηpdw) is investigated. The fixed parameters of the PDWs are relative roughness height of perforated delta-shaped winglets = 0.8, relative longitudinal length of the perforated delta-shaped winglet = 2, relative transversal length of the perforated delta-shaped winglet = 0.66 and angle of incidence = 90°. The Nupdw and frpdwof SAH provided with artificial roughened in the form of PDWs were improved by 5.17 and 4.52 times in comparison to SAH having smooth absorber plate. At the optimum value of spacer lengthSpdw = 0 mm and Re of 12000, ηpdw attains a maximum value of 3.14 (>1). The study reveals the effectiveness of perforated delta winglets in the heat transfer augmentation of SAH
Escaping Saddle Points with Adaptive Gradient Methods
No full text© 2019 International Machine Learning Society (IMLS). Adaptive methods such as Adam and RMSProp are widely used in deep learning but are not well understood. In this paper, we seek a crisp, clean and precise characterization of their behavior in nonconvex settings. To this end, we first provide a novel view of adaptive methods as preconditioned SGD, where the preconditioner is estimated in an online manner. By studying the preconditioner on its own, we elucidate its purpose: it rescales the stochastic gradient noise to be isotropic near stationary points, which helps escape saddle points. Furthermore, we show that adaptive methods can efficiently estimate the aforementioned preconditioner. By gluing together these two components, we provide the first (to our knowledge) second-order convergence result for any adaptive method. The key insight from our analysis is that, compared to SGD, adaptive methods escape saddle points faster, and can converge faster overall to second-order stationary points
Structural analysis and optimization of machine structure for the measurement of cutting force for wood
No full textStructural Integrity and its response to the subjected cutting forces during machining, plays a vital role in the performance and the life of the machine tool. The machine tool must meet the demands of the stiffness and easy maintenance; in absence of this the desired machining accuracy during cutting operation is not achieved. While at the same time the machine structure cannot be made heavy which increases the manufacturing cost. The use of stiffener plates is a solution to this problem. However, the selection of the appropriate locations of stiffener plates based on only designer’s design knowledge and experience may not lead to desired results. Hence, Structural analysis in conjunction with the structural optimization methods are employed for getting optimized structures. In this paper, experimental results obtained from the cutting force measuring machine which was manufactured for the experiment were used to analyse and optimize the structure of machine tool. The analysis and optimization were done with the help of Finite element methods technique (Optistruct solver) and modelling being done in Hypermesh. The optimized structure with stiffeners, led to the decrease in the maximum displacement thus increasing the stiffness of the machine structure while avoiding resonance
Analytical investigation of solar parabolic trough receiver with multiple twisted tapes using exergy and energy analysis
No full textExergy analysis is an important thermodynamic approach to studying the system's actual output, considering all losses. The present study is an analytical approach to calculating the thermal and exergetic efficiencies of the parabolic trough receiver using MATLAB R2018a simulation software. These efficiencies are evaluated considering temperature rise characteristics and parametric design factors. The influence of the solar air heater's thermal and exergy analysis-based mathematical model on all design parameters is examined. The receiver tube has multiple twisted tape inserts with three varying parameters, i.e., twist ratio (y/w) = 3 to 5, perforation ratio (dp/w) = 0.05 to 0.25, and winglet ratio (d/w) = 0.1 to 0.3. The twisted tape with y/w, dp/w, and d/w having values 3, 0.1, and 0.05 perform better regarding energy and exergy with values 84.27% and 4.28%, respectively. This thorough examination can prove to be highly effective and advantageous in generating the design model for the specified twisted tape parameter value without requiring extensive investment in actual experimentation while also furnishing an evaluation of the performance of the solar air heater design
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