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A. Manna ¹, Sandeep Salodkar ¹, Suprakash Patra ¹

Affiliations
1 Mechanical Engg. Deptt., Punjab Engineering College, (Deem University), Chandigarh-160012, IN

Abstract

The paper describes the procedure to obtain the machining conditions for turning operation considering unit cost of production as an objective function. The optimality conditions for single point cutting operations are determined based on the objective function using dynamic programming technique. The optimal policy of machining conditions are determined for evolution of minimum cost considering the important cost related machining criteria such as actual machining time, tool reuse time, set up time, tool life, and tool changing time. The mathematical models are also developed considering the Krononbergs data used for standard turning operation. The effects of different constraints on the objective functions are analyzed through various graphical representations. In this study, the Taguchi method, a powerful tool for experiment design is also used to optimize the cutting parameters to achieve better surface finish characteristics and to identify the most effective parameter for cost evolution during turning. The developed optimality condition affects the economics of machining conditions. The graphical representations also help to understand and analyze the effects of various input constraints at the optimum point and their significant Influences on production cost. The analysis can propose an effective methodology in advance for proper setting of machining parameters in practice, which may reduce the cost of unit production.

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A. Manna ¹, B. Bhattacharya ²

Affiliations
1 Mech. Engg. Deptt., Punjab Engineering College, Chandigarh-160012, IN
2 Production Engineering Department, Jadavpur University, Kolkata-700032, IN

Abstract

In this investigation, Taguchi method 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) and 'F' test values the significant factors are determined for surface roughness. Mathematical model relating to the machining performance criteria e.g. surface finish 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 AI/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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A. Manna ¹, B. Bhattacharya ²

Affiliations
1 Mech. Engg. Department, Punjab Engineering Coilege, Chandigarh -160012, IN
2 Production Engineering Department, Jadavpur University, Koikata-700032, IN

Abstract

In the experimental study, Taguchi method, a powerful tool in the design of experiment is used to optimize the parametric combination of CNC-Wire cut-EDM for effective machining of Al-SiC MMC. From experimental results and through analysis of variance (ANOVA) the significant factors are determined for favorable gap current (Ig). Mathematical model relating to the gap current 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 AI/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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A. Manna ¹, B. Bhattacharyya ¹

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

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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R. Suresh ¹, M. S. Rao ², A. Manna ³, N. P. Waghmare ¹, A. K. Pal ¹

Affiliations
1 Central Forensic Science Laboratory, Kolkata, IN
2 Chief Forensic Scientist, DFS, MHA, New Delhi, IN
3 Dept. of Physics, Jadavpur University, Kolkata, IN

Abstract

Law enforcement agencies have relied upon the science of "forensic ballistics" to link fired bullets and cartridge cases to each other and to alleged firearms. At a crime scene, physical evidence is routinely encountered, for example, fired shells, bullets, gunpowder residues on the body or clothing of victims or perpetrators. These ar(> knowingly or unknowingly left by the culprits at the scene of occurrence. The underlying principle is that when a tool (firearm) acts on some object (cartridge) it will leave marks, which is unique due to the configuration of the firearm. The uniqueness of each weapon is a result of manufacturing processes and post manufacturing wear and damage. Every gun leaves its own unique microscopic markings on the surface areas of fired bullets and cartridge cases. Experts compare these markings in an effort to identify similarities that positively link them together, subsequently concluding that the ammunition components were fired from the same firearm. Experts who undertake examinations and studies in this field are referred as 'Ballistics Experts' or 'Firearm Examiner'. A ballistics expert employs basic scientific principles to propose a hypothesis of a shooting incident follov/ed by testing it through series of experiments, collects & compiles various data to form a logical conclusion and/or to offer expert opinion. In shooting incidents, it is often required to establish that whether it v^'as a case of suicide, homicide or accidental. This paper gives a basic knowledge about the understanding of working mechanism of firearms & ammunition and their method of identification, which may largely be benefited to invesligating officers (lOs), law enforcement agencies, students and other scientific community.

Keywords

forensic ballistics, firearm identification, cartridge case, bullet, tool marks, crime scene, comparison microscope, ballistics expert.

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A. Manna ¹

Affiliations
1 ISEC, IN

Abstract

No Abstract.

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A. Manna ¹

Affiliations
1 ISEC, IN

Abstract

No Abstract.

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A. Manna ¹

Affiliations
1 Ind Sc Cr, IN

Abstract

No Abstract.

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A. Manna ¹

Affiliations
1 Indian Science Cruiser, IN

Abstract

No Abstract.

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N. P. Waghmare ¹, M. S. Rao ², A. Manna ³

Affiliations
1 Central Forensic Science Laboratory, 30. Gorachand Road, Kolkala-700 014, IN
2 Directorate of Forensic Science, MHA, Govt of India, Lodhi Road, New Delhi - 110 003, IN
3 Department of Physics, Jadavpur University. Kolkata - 700 032, IN

Abstract

Homicide, suicide and accidental shooting are not common in India. In view of socioeconomic importance of such crime cases, thorough and proper investigation are required for their solutions. Rate of conviction in our country is very low compared to other countries. In the present article the authors have described the science of identification of firearms and their ammunitions which are used in shooting incidents.

Keywords

No Keywords.

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K. K. Yadav ¹, N. Chouhan ², R. Thubstan ², S. Norlha ², J. Hariharan ², C. Borwankar ², P. Chandra ², V. K. Dhar ¹, N. Mankuzhyil ², S. Godambe ², M. Sharma ², K. Venugopal ², K. K. Singh ¹, N. Bhatt ², S. Bhattacharyya ¹, K. Chanchalani ², M. P. Das ², B. Ghosal ², S. Godiyal ², M. Khurana ², S. V. Kotwal ², M. K. Koul ², N. Kumar ², C. P. Kushwaha ², K. Nand ², A. Pathania ², S. Sahayanathan ¹, D. Sarkar ², A. Tolamati ², R. Koul ³, R. C. Rannot ⁴, A. K. Tickoo ⁵, V. R. Chitnis ⁶, A. Behere ⁷, S. Padmini ⁷, A. Manna ⁷, S. Joy ⁷, P. M. Nair ⁷, K. P. Jha ⁷, S. Moitra ⁷, S. Neema ⁷, S. Srivastava ⁷, M. Punna ⁷, S. Mohanan ⁷, S. S. Sikder ⁷, A. Jain ⁷, S. Banerjee ⁷, Krati ⁷, J. Deshpande ⁷, V. Sanadhya ⁸, G. Andrew ⁸, M. B. Patil ⁸, V. K. Goyal ⁸, N. Gupta ⁸, H. Balakrishna ⁸, A. Agrawal ⁸, S. P. Srivastava ⁹, K. N. Karn ⁹, P. I. Hadgali ⁹, S. Bhatt ⁹, V. K. Mishra ⁹, P. K. Biswas ⁹, R. K Gupta ⁹, A. Kumar ⁹, S. G. Thul ⁹, R. Kalmady ¹⁰, D. D. Sonvane ¹⁰, V. Kumar ¹⁰, U. K. Gaur ¹⁰, J. Chattopadhyay ¹¹, S. K. Gupta ¹¹, A. R. Kiran ¹¹, Y. Parulekar ¹¹, M. K. Agrawal ¹¹, R. M. Parmar ¹¹, G. R. Reddy ¹², Y. S. Mayya ¹³, C. K. Pithawa ¹⁴

Affiliations
1 Astrophysical Sciences Division, Bhabha Atomic Research Centre, Mumbai 400 085, India; Homi Bhabha National Institute, Mumbai 400 085, India, IN
2 Astrophysical Sciences Division, Bhabha Atomic Research Centre, Mumbai 400 085, India, IN
3 Formerly at Astrophysical Sciences Division, Bhabha Atomic Research Centre, Mumbai 400 085, India, IN
4 Raja Ramanna Fellow at Astrophysical Sciences Division, Mumbai 400 085, India, IN
5 Deceased, IN
6 Department of High Energy Physics, Tata Institute of Fundamental Research, Mumbai 400 005, India, IN
7 Electronics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India, IN
8 Control and Instrumentation Division, Bhabha Atomic Research Centre, Mumbai 400 085, India, IN
9 Center for Design and Manufacture, Bhabha Atomic Research Centre, Mumbai 400 085, India, IN
10 Computer Division, Bhabha Atomic Research Centre, Mumbai 400 085, India, IN
11 Reactor Safety Division, Bhabha Atomic Research Centre, Mumbai 400 085, India, IN
12 Formerly at Reactor Safety Division, Bhabha Atomic Research Centre, Mumbai 400 085, India, IN
13 Formerly at Reactor Control Division, Bhabha Atomic Research Centre, Mumbai 400 085, India, IN
14 Formerly at Electronics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India, IN

Abstract

The MACE telescope has recently been commissioned at Hanle, Ladakh, India. It had its first light in April 2021 with a successful detection of very high energy gamma-ray photons from the standard candle Crab Nebula. Equipped with a large light collector of 21 m diameter and situated at an altitude of ~4.3 km amsl, the MACE telescope is expected to explore the mysteries of the non-thermal Universe in the energy range above 20 GeV with very high sensitivity. It can also play an important role in carrying out multi-messenger astronomy in India.

Keywords

Gamma-ray astronomy, high energy radiative processes, non-thermal Universe, telescope.

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