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Effect of pouring temperature on cooling slope casting of semi-solid Al-Si-Mg alloy

Acta Metallurgica Sinica(English Letters) 2012年第5期25卷 329-339页

作者： prosenjit das Sudip K. Samanta Himadri Chattopadhyay Pradip Dutta Foundry Group CSIR-Central Mechanical Engineering Research Institute Durgapur-713209 India Department of Mechanical Engineering Jadavpur University Kolkata-70032 India Department of Mechanical Engineering Indian Institute of Science Bangalore-560012 India

Present trend of semi-solid processing is directed towards rheocasting route which allows manufacturing of near-net-shape cast components directly from the prepared semi-solid slurry. Generation of globular equi-axed grains during solidification of rheocast components, compared to the columnar dendritic structure of conventional casting routes, facilitates the manufacturing of components with improved mechanical properties and structural integrity. In the present investigation, a cooling slope has been designed and indigenously fabricated to produce semi solid slurry of A1-Si-Mg （A356） alloy and successively cast in a metallic mould. The scope of the present work discusses about development of a numerical model to simulate the liquid metal flow through cooling slope using Eulerian two-phase flow approach and to investigate the effect of pouring temperature on cooling slope semi-solid slurry generation process. The two phases considered in the present model are liquid metal and air. Solid fraction evolution of the solidifying melt is tracked at different locations of the cooling slope, following Schiel＇s equation. The continuity equation, momentum equation and energy equation are solved considering thin wall boundary condition approach. During solidification of the liquid metal, a modified temperature recovery scheme has been employed taking care of the latent heat release and change of fraction of liquid. The results obtained from simulations are compared with experimental findings and good agreement has been found.

关键词： Rheocasting Semi-solid slurry Cooling slope A356 alloy Numerical simulation

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Development and performance characterization of a compact plasma focus based portable fast neutron generator

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Plasma Science and Technology 2020年第11期22卷 127-135页

作者： Rishi VERMA Ekansh MISHRA prosenjit DHANG Basanta Kumar das Manraj MEENA Lakshman RONGALI Archana SHARMA Pulsed Power&Electromagnetics Division Bhabha Atomic Research Centre FacilityAtchutapuramVishakhapatnam 531011.India Homi Bhabha National Institute AnushaktinagarMumbai 400094India Raja Ramanna Centre for Advanced Technology Rajendra NagarIndore 452013India Variable Energy Cyclotron Centre BidhannagarKolkata 700064India

The design details and performance characterization results of a newly developed plasma focus based compact and portable system(0.5 m×0.5 m×1.2 m,weighing≈100 kg)that produces an average neutron yield of^2×10^8 neutrons/shot(of fast D-D neutrons with typical energy^2.45 Me V)at^1.8 k J energy discharge are *** the detailed analysis of the experimental characterization and simulation results of this system,it has been conclusively revealed that specifically in plasma focus devices with larger static inductance:(i)pinch current is a reliable and more valid neutron yield scaling parameter than peak current,(ii)the ratio of pinch/peak current improves as static inductance of the system reduces,(iii)the benign role of the higher static/pinch inductance ratio enables the supply of inductively stored energy in densely pinched plasma with a larger time constant and it is well depicted by the extended dip observed in the discharge current trace,(iv)there is the need to redefine existing index values of the pinch(Ipinch^4.7)and peak(Ipeak^3.9)currents in neutron yield scaling equations to higher values.

关键词： plasma focus neutrons time of flight pinch current peak current plasma pinch pseudospark switch

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A Unit Study of Externality of Shrimp Farming on Provisioning Services (Paddy Farming)

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NASS Journal of Agricultural Sciences 2019年第2期1卷 13-18页

作者： Suvendu das prosenjit Saha Arnab Banerjee Manaswee Maity Santanu Ray Systems Ecology&Ecological Modelling Laboratory Department of ZoologyVisva-Bharati UniversitySantiniketan731235India Department of Geography Memari CollegeMemariBurdwan713146India Department of Mathematics Jadavpur UniversityKolkata700032India

Externality;the term can define as a positive or negative impact from either production or consumption of goods or *** provided by particular location have very specific dependency on spatial characteristics of that region.A region’s distinct characteristics make it ecologically unique from other such *** services are offered by these regions thus differ according to these unique ecological *** this particular study,artificially imposed expansion of coastal shrimp farming towards the inland and its impact over paddy cultivation have been *** of the extent of this manipulative coastal expansion has been supported by little modification of a previously described *** the investment prediction for both shrimp and paddy farming has been investigated by calculating net present value(NPV).Shrimp farming has very specific externality on local ecosystem *** this particular case,some contradictory results are presented and with respect to positive or negative externality;but the externalities are *** results indicate that there is no long-term profitability in case of shrimp ***,an overall externality of shrimp farming has been described in context of this study.

关键词： Shrimp culture Altered ecosystem services Paddy farming Spatial influence Net Present Value Externality

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