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Bhattacharyya, B.

• Education Documentation

Abstract Views :225  |  PDF Views:2

Authors

B. Bhattacharyya ¹

Affiliations
1 Documentation Research and Training Centre, Bangalore 3, IN

Source

Journal of Information and Knowledge (Formerly SRELS Journal of Information Management), Vol 8, No 2 (1971), Pagination: 181-192

Abstract

The definition of the term 'Documentation' given by the Indian School of thought is discussed; and it is  shown how it has removed the semantic confusion round the term. The objectives of "Education in Documentation" are enumerated; and the subject is discussed in the context of Indian conditions under the following headings: 1 Magnitude of demand; 2 Levels of education; 3 Entrance qualification; 4 Coursecontents; 5 Method of teaching; 6 Research in documentation; and 7 Education for teachers of documentation. The achievements of DRTC in the field of education in documentation are referred to.

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• Parasitoids and Predators of Rice Insect Pests of Jorhat Districts of Assam

Abstract Views :203  |  PDF Views:193

Authors

B. Bhattacharyya ¹, A. Basit ¹, D. K. Saikia ¹

Affiliations
1 Department of Entomology, Assam Agricultural University, Jorhat, 785 013, Assam, IN

Source

Journal of Biological Control, Vol 20, No 1 (2006), Pagination: 37-44

Abstract

Parasitoids and predators of rice ecosystem recorded during 1999-2000 at three locations of Jorhat district of Assam are listed. Altogether 30 species of parasitoids and 26 species of predators were recorded along with their hosts, period of activity and relative abundance.

Keywords

Insect Pests, Parasitoids, Predators, Rice.

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• Optimization of Micro-Electrochemical Discharge Machining of Silicon Nitride Ceramics Using Moora

Abstract Views :389  |  PDF Views:136

Authors

S. Biswas ¹, B. R. Sarkar ¹, B. Doloi ¹, B. Bhattacharyya ¹

Affiliations
1 Production Engineering Department, Jadavpur University, Kolkata-700032, IN

Source

Reason-A Technical Journal (Formerly Reason-A Technical Magazine), Vol 13 (2014), Pagination: 21-31

Abstract

Manufacturing of the better quality ceramic products with more accuracy and precision is a great challenge in the current industrial field. Electrically non-conducting materials like ceramics, composites, alumina, glass etc can be machined easily using Electrochemical Discharge Machining (ECDM) process. The performance characteristics of ECDM process e.g. material removal rate (MRR), machining depth rate (MDR), radial overcut (ROC) and heat affected zone (HAZ) are influenced by various process parameters such as applied voltage, inter-electrode gap, temperature, concentration of the electrolyte, type of electrolyte, shape, size and material of the electrode and also the nature of the power supply etc. This paper presents the optimization of m-EDMing of Silicon Nitride by utilizing Multi-Objective Optimization by Ratio Analysis (MOORA). Also, a multi choice decision analysis i.e. Analytic Hierarchy Process (AHP) is applied for optimization.

Keywords

μ-ECDM, MRR, MDR, ROC, HAZ, MOORA.

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• Parametric Analysis of Travelling Wire Electrochemical Discharge Machining Process

Abstract Views :387  |  PDF Views:143

Authors

B. Mallick ¹, B. R. Sarkar ¹, B. Doloi ¹, B. Bhattacharyya ¹

Affiliations
1 Production Engineering Department, Jadavpur University, Kolkata-700032, IN

Source

Reason-A Technical Journal (Formerly Reason-A Technical Magazine), Vol 12 (2013), Pagination: 93-101

Abstract

Travelling Wire Electrochemical Discharge Machining (TW-ECDM) process is a special type of Electrochemical Spark Machining (ECSM) process which has a greater effectiveness for machining of electrically non-conducting material like hylam based fiber reinforced plastics (FRP). The recent research paper focuses the parametric analysis on machining criteria such as material removal rate (MRR) and Overcut (OC) for slot cutting operation considering applied voltage, electrolyte concentration, feed rate of wire and pulse on time etc as process parameters. This paper shows the single and multi-objective optimization for determining the optimal parametric combination of TWECDM for maximum MRR and minimum OC based on response surface methodology (RSM). From the parametric analyses it is concluded that applied voltage has more significant effects on MRR and OC during TW-ECDM slot cutting operation.

Keywords

TW-ECDM, ECSM, MRR, OC, RSM.

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• Nd: Yag Laser Marking on Aluminium

Abstract Views :336  |  PDF Views:124

Authors

Josephine Peter ¹, B. Doloi ¹, B. Bhattacharyya ¹

Affiliations
1 Production Engineering Department, Jadavpur University, Kolkata-700032, IN

Source

Reason-A Technical Journal (Formerly Reason-A Technical Magazine), Vol 13 (2014), Pagination: 119-126

Abstract

Nd: YAG Laser marking is flexible, programmable and environmentally clean process, which can indelibly mark at very fast speeds. The present paper deals with the analysis of laser marking process parameters like lamp current, laser scanning speed, pulse frequency of laser beam using Nd: YAG laser on various laser marking characteristics like the mark width, mark depth and mark intensity are studied during pulsed Nd: YAG laser marking on aluminium. The present study shows that high pulse frequency and lamp current with low scanning speed has more effect to achieve the minimum mark width, maximum mark depth. Also high pulse frequency and scanning speed has more effect on the mark intensity. In addition to it, analysis based on optical photographs has also been performed.

Keywords

Pulsed Laser, Nd: Yag Laser, Laser Marking, Mark Width, Mark Depth.

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• Optimization of Surface Roughness during Nd:YAG Laser Micro-Turning Process of Alumina

Abstract Views :314  |  PDF Views:0

Authors

G. Kibria ¹, B. Doloi ², B. Bhattacharyya ²

Affiliations
1 Mechanical Engineering Department, Aliah University, Kolkata-700091, IN
2 Production Engineering Department, Jadavpur University, Kolkata-700032, IN

Source

Journal of the Association of Engineers, India, Vol 84, No 3-4 (2014), Pagination: 36-48

Abstract

Laser micro-turning process is one of the newly developed laser material processing technologies to generate micro-turned groove or surface on cylindrical workpiece. In the present paper, an attempt has been made to investigate the laser micro-turning operation on cylindrical shaped aluminium oxide (Al₂O₃) ceramic to study the influence of different laser micro-turning process parameters namely, laser average power, pulse frequency, workpiece rotational speed, assist air pressure and Y feed rate using response surface methodology (RSM) experimental plan. The mathematical model for surface roughness (Ra) has been developed and the adequacy of the model has been tested through analysis of variance (ANOVA) results. Average power and pulse frequency are the most significant process parameters. Optimal parametric combination for minimum value of surface roughness has been achieved as 5.23μm at parametric setting of average power of 9.04 W, pulse frequency of 4108.18 Hz, workpiece rotational speed of 451.16 rpm, air pressure of 1.44 kgf/cm² and Y feed rate of 0.37 mm/s. Confirmation experimental results show a good agreement between RSM based optimal and experimental value of response criterion.

Keywords

Laser Micro-Turning, Surface Roughness, Alumina, Response Surface Methodology.

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• Effect of Boron Carbide (B₄C) Additive during Micro-Electrical Discharge Machining of Ti-6Al-4V Alloy

Abstract Views :342  |  PDF Views:0

Authors

G. Kibria ¹, B. Bhattacharyya ²

Affiliations
1 Mechanical Engineering Department, Aliah University, Kolkata-700091, IN
2 Production Engineering Department, Jadavpur University, Kolkata-700032, IN

Source

Journal of the Association of Engineers, India, Vol 83, No 3-4 (2013), Pagination: 25-34

Abstract

Micro-electrical discharge machining (μEDM) deals with micro dimensional material removal from the work sample due to the repetitive spark discharge between the micro-tool electrode and the workpiece. In the present paper, an attempt has been made to machine through micro-holes on Ti-6Al-4V superalloy plates to investigate the effect of mixing of Boron Carbide (B₄C) powder additive in kerosene dielectric. A detailed comparative study has been made showing the effect on micro-ED machining criteria i.e. material removal rate (MRR), tool wear rate (TWR), overcut (OC) and taper by varying two most influencing micro-EDM process parameters i.e. peak current and pulse-on-time keeping other parameters such as flushing pressure, duty ratio, gap voltage, etc. as constant. It has been found that B₄C powder can enhance material removal rate while it can reduce tool wear rate. Analyses have also been done showing some optical and SEM micrographs of the micro-tool electrode tips as well as machined micro-hole walls to study the micro-hole surface features during experimentation.

Keywords

Micro-EDM, Ti-6Al-4V, Boron Carbide Additive, MRR, TWR, Overcut, Dielectric.

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• The Effect of Defocused Machining During Laser Micro-Turning process of Aluminium Oxide (Al₂O₃) Ceramics

Abstract Views :159  |  PDF Views:1

Authors

G. Kibria ¹, B. Doloi ², B. Bhattacharyya ²

Affiliations
1 Mechanical Engineering Department, Aliah University, Kolkata, IN
2 Production Engineering Department, Jadavpur University, Kolkata, IN

Source

Manufacturing Technology Today, Vol 14, No 2 (2015), Pagination: 20-27

Abstract

The present paper addresses the laser micro-turning process of aluminium oxide (Al₂O₃) ceramics of size 10 mm in diameter and 40 mm in length. The experiments have been conducted using response surface methodology design of experiments. The targeted depth was set at 100 μm. Laser average power, pulse frequency, workpiece rotating speed, air pressure and Y feed rate were considered as process variables. After each experiment, surface roughness (Ra) and micro-turning depth deviation have been measured. Multi-objective optimization has been done to obtain optimal values of responses i.e. surface roughness and depth deviation. To achieve further high quality machined surface, machining was done at various defocusing conditions of laser beam and also by varying the number of laser scan passes. Other parameters were kept constant at optimal parametric combination obtained in multi-objective optimization. From the experimental results, it was revealed that surface roughness decreases with increase in defocusing positions. With increase in number of passes up to a certain limit, surface roughness decreases. However, depth deviation increases with number of laser scan passes at all levels of defocus planes.

Keywords

Pulsed Nd:YAG Laser, Laser Micro-Turning, Surface Roughness, Advanced Ceramics, Aluminium Oxide (Al₂O₃), Defocusing Positions.

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• Strategies and Technology for Effectual Engineering Education

Abstract Views :180  |  PDF Views:0

Authors

S. Patra ¹, S. K. Deb ², B. Bhattacharyya ³

Affiliations
1 E.E. Dept., Assam Engineering College, Guwahati-781013, IN
2 M.E. Dept., Jorhat Engineering College, Jorhat -785007, IN
3 Production Engineering Dep, Jadavpur University, Kolkata, IN

Source

Journal of Engineering Education Transformations, Vol 19, No 1 (2005), Pagination: 5-8

Abstract

Engineering education today in India has achieved new found respect and is enjoying growing demand. But less attention has been paid to incorporate technical skill and innovative teaching in engineering education. This paper discusses the need and possibilities of integrating strategies and technology for effectual engineering education. It also suggest some thoughts that create positive attitudes toward technology and constructive teaching/learning philosophy in engineering education by introducing the specific initiatives of several educational programs, and in turn, hopes to inspire new initiatives that will offer most value to students, the institute, and the community.

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• Present Status of ND:YAG Laser Marking Process

Abstract Views :170  |  PDF Views:0

Authors

P. Josephine ¹, B. Doloi ¹, B. Bhattacharyya ¹

Affiliations
1 Production Engg. Dept., Jadavpur University, Kolkata, IN

Source

Manufacturing Technology Today, Vol 9, No 5 (2010), Pagination: 16-26

Abstract

Laser marking is one of the emerging technologies in the field of laser processing. Laser marking is the best and most applied technique to make permanent marks on a wide range of materials. Nd:YAG laser beam can be used for marking on various materials such as ceramics, metals and composites etc. This paper includes the review on research activities in the area of Nd:YAG laser marking process. The present status of Nd:YAG laser marking process will obviously generate further scope of research and development in the field of laser marking.

Keywords

Nd:YAG Laser, Laser Marking, Engineering Materials.

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• Present Status of Nd:YAG Laser Beam Micromachining of Engineering Ceramics

Abstract Views :163  |  PDF Views:0

Authors

G. Kibria ¹, B. Doloi ¹, B. Bhattacharyya ¹

Affiliations
1 Prod. Engg. Dept., Jadavpur University, Kolkata, IN

Source

Manufacturing Technology Today, Vol 8, No 7 (2009), Pagination: 3-12

Abstract

Laser beam machining (LBM) is a non-contact type of material removal process and this advanced thermal machining process is extensively used worldwide in material processing field in modern industries. The high density focused laser beam melts and vaporizes the unnecessary portion of parent material very efficiently. During the last decades, a number of researchers have explored experimentally and theoretically this Nd:YAG laser beam machining technique with different materials like metals, alloys, ceramics and composites through a number of ways to improve the machining performances. The paper reviews the research works performed in the area of Nd:YAG laser micromachining operations such as micro-drilling, microgrooving, micro-cutting, micro-milling, micro-turning and marking etc. on aduanced engineering ceramics for searching out the various micro-machining process parameters and their effects on laser machining performance characteristics.

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• Travelling Wire Electrochemical Discharge Machining System Development for Precision Machining of Non-Conducting Materials

Abstract Views :176  |  PDF Views:0

Authors

B. Doloi ¹, N. S. Mitra ¹, A. K. Mete ¹, B. Bhattacharyya ¹

Affiliations
1 Production Engg. Dept., Jadavpur University, Kolkata-700032, IN

Source

Manufacturing Technology Today, Vol 6, No 4 (2007), Pagination: 18-22

Abstract

Traveling Wire Electrochemical Discharge Machining (TW-ECDM) System has great potential to cut non-conducting engineering hard materials such as ceramics and composites etc. There is also an urgent need for precision machining of engineering ceramics and composites with the development of these materials. Several non-conventional machining processes are available but all of them have inherent difficulties. The traditional method of slicing glass and ceramics, quartz etc. is limited mainly due to high cutting force and requirement of utra-hard tool materials. Hence there is a need to develop an efficient method of cutting and slicing non-conducting engineering materials. Traveling Wire Electrochemical Discharge Machining (TW-ECDM) is an important useful process for this purpose. Present research paper includes the design and development of the experimental setup of total TW-ECDM system which consists of main machining chamber, mechanical hardware modules, electrolyte flow control units and electrical pulsed dc power supply unit. The operation of the developed TWECDM System has been tested after carrying out some experimentation on cutting of Silicon Nitride.

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• Analysis on the Machining of Silicon Nitride Ceramic Materials through Electrochemical Discharge Machining Process

Abstract Views :188  |  PDF Views:0

Authors

B. R. Sarkar ¹, B. Doloi ¹, B. Bhattacharyya ¹

Affiliations
1 Production Engineering Department, Jadavpur University, Kolkata-700 032, IN

Source

Manufacturing Technology Today, Vol 4, No 6 (2005), Pagination: 8-12

Abstract

The electrochemical discharge machining (ECDM) process is a non-conventional, thermoelectric, hybrid machining process, which uses electrochemical discharge phenomenon and has a great potential to machine an electrically non-conducting engineering ceramic like Silicon Nitride (Si3N4). The present research paper highlights on the development of a second order non-linear mathematical model that establishes a relationship between the penetration rate and different process parameters such as applied voltage, electrolyte concentration and inter-electrode gap utilising the experimentally obtained data during micro-drilling of silicon nitride by electrochemical discharge machining process. The experimentation has been conducted according to the central composite second order rotatable design based on Response Surface Methodology (RSM). The analysis of variance (ANOVA) has been performed to verify the adequacy of the aforesaid polynomial mathematical model. The parametric effects have also been studied based on the developed mathematical model for obtaining optimal penetration rate during micro-drilling of Silicon Nitride by ECDM process.

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• Analysis of Nd:YAG Laser Machining Parameters Based on Taguchi Method During Profile Generation

Abstract Views :183  |  PDF Views:0

Authors

A. S. Kuar ¹, B. Doloi ¹, B. Bhattacharyya ¹

Affiliations
1 Production Engineering Department, Jadavpur University, Kolkata-700032, IN

Source

Manufacturing Technology Today, Vol 3, No 1 (2004), Pagination: 15-18

Abstract

A Nd:YAG pulsed CNC laser machining-system has potential for precision machining operation on very hard conductive as well as non-conductive materials. For achieving high profile accuracy, the important process parameters such as the radio frequency of Q-switch, lamp current and cutting speed are to be optimally controlled because these controllable process parameters mostly affect the precision machining i.e. dimensional accuracy and surface roughness. In this present research, a hard cutting tool material has been chosen for generating intricate and accurate shape of cutting tool and the accuracy in profile cutting and surface roughness are considered as the responses of the Nd:YAG laser cutting operation. Taguchi method based parametric optimisation is applied for determining the optimal parametric combination for achieving high quality machining characteristics during Nd:YAG laser cutting operation. The confirmation test has also been carried out to predict and verify the adequacy of the additive model for determining the optimal machining characteristics.

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• Optimization of CNC-Wire Cut EDM parameters during Machining of AI/SiC-MMC based on Robust Design

Abstract Views :152  |  PDF Views:0

Authors

A. Manna ¹, B. Bhattacharyya ¹

Affiliations
1 Production Engineering Department, Jadavpur University, Koikata-700032, IN

Source

Manufacturing Technology Today, Vol 2, No 8-9 (2003), Pagination: 3-7

Abstract

In the experimental study, Taguchi method, a powerful tool in the design of experiment, is used to optimize the CNC-Wire cut-EDM parameters for effective machining of Ai-SiC MMC. From experimental results and through analysis of variance (ANOVA) the significant factors are determined for metal removal rate. Mathematical model relating to the machining performance of WEDM is established using Gauss elimination method for effective machining of AI/SiC-MMC. Confirmation test results show that the developed mathematical model is appropriate for effective machining of Al/SiC MMC and the determined optimal combination of CNC-Wire cut-EDM parameters can also satisfy the real requirement in practice.

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• Electrochemical Micromachining (EMM) System Development for Experimental Investigation

Abstract Views :162  |  PDF Views:0

Authors

B. Bhattacharyya ¹, J. Munda ¹

Affiliations
1 Department of Production Engineering, Jadavpur University, Kolkata-700 032, IN

Source

Manufacturing Technology Today, Vol 2, No 7 (2003), Pagination: 3-7

Abstract

Electrochemical Micromachining (EMM) is considered to be one of the most effective advanced future micro-fabrication techniques due to its several advantages. A suitable EMM setup mainly consisting of various components and subsystems, e.g., mechanical machining unit, micro-tooling system, electrical power and controlling system and controlled electrolyte flow system etc has been developed successfully to control ECM parameters to meet the micromachining requirements. Investigation indicates most effective zone of predominant process parameters such as machining voltage, electrolyte concentration and pulse on time, which give the appreciable amount of MRR with less overcut. The developed EMM setup is a unique system and will open up possibilities for further research works.

Keywords

EMM Setup, EMM Process Parameters.

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• Torpor in insects

Abstract Views :198  |  PDF Views:77

Authors

S. Borkataki ¹, B. Bhattacharyya ¹, S. Sen ¹, R. R. Taye ², M. D. Reddy ³, S. P. Nanda ⁴

Affiliations
1 Department of Entomology, Assam Agricultural University, Jorhat 785 013, IN
2 Regional Agricultural Research Station, Karimganj 788 710, IN
3 M.S. Swaminathan School of Agriculture, Centurion University, Paralakhemundi 761 211, IN
4 School of Applied Sciences, Centurion University, Paralakhemundi 761 211, IN

Source

Current Science, Vol 120, No 11 (2021), Pagination: 1692-1697

Abstract

Sleep is a biologically cyclical episode of brain and body which may be referred to as a behavioural and corporeal condition characterized by change in alertness, decrease in sensitivity to extrinsic stimuli and regulation of homeostasis. Basically sleep is considered to be a key requisite for all organisms including insects. The term ‘Torpor’ is used to denote sleep in insects which is not exactly similar to that of sleep as in case of human beings but is a sleep-like state where the insects remain in a state of decreased physiological activities, reduced body temperature and metabolic rate. The circadian clock and sleep homeostasis are the vital mechanisms known to regulate torpor. However, more precise and minute observations are required for studying the sleep pattern of the insect brain to draw a logistic conclusion on this aspect, which needs further research.

Keywords

Circadian Clock, Drosophila melanogaster, Homeostasis, Insects, Torpor.

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