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- 저자 : Sumit Ghosh (검색결과 4 건)
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Sumit Ghosh,Mahesh Chandra Somani,Daria Setman,Suhrit Mula 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.8
An effort has been made to establish a relation between Zener–Hollomon parameter, flow stress and dynamic recrystallization(DRX). In this context, the plastic flow behavior of Ti + Nb stabilized interstitial free (IF) steel was investigated in atemperature range of 650–1100 °C and at constant true strain rates in the range 10−3–10 s−1, to a total true strain of 0.7. Theflow stress curves can be categorized into two distinct types, i.e. with/without the presence of steady-state flow followingpeak stress behavior. A novel constitutive model comprising the strain effect on the activation energy of DRX and othermaterial constants has been established to predict the constitutive flow behavior of the IF steel in both α and γ phase regions,separately. Predicted flow stress seems to correlate well with the experimental data both in γ and α phase regions with ahigh correlation coefficient (0.982 and 0.936, respectively) and low average absolute relative error (7 and 11%, respectively)showing excellent fitting. A detailed analysis of the flow stress, activation energy of DRX and stress exponent in accord withthe modelled equations suggests that dislocation glide controlled by dislocation climb is the dominant mechanism for theDRX, as confirmed by the transmission electron microscopy analysis.
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Sumit Das,Amitesh Gupta,Sasanka Ghosh 대한공간정보학회 2017 Spatial Information Research Vol.25 No.6
In this paper, an attempt has been made to delineate groundwater potential zones in Hingoli district, Maharashtra, India. Remote sensing and traditional data were collected from different sources and analysed in GIS software to prepare thematic maps of different geo-environmental factors such as lithology, drainage, lineaments, slope etc. as these factors having an impact on groundwater availability of an area, directly or indirectly. All these factors have been integrated into GIS software and multi influence factor method was applied to delineate groundwater potential zones. The result has shown about 50% area is having the good potentiality of groundwater, whereas about 6% region falls under very low potential area. The Central part of the study area is having very low groundwater potential, mainly due to the steep slope and rocky outcrop. The southern part of the Hingoli district has shown good groundwater potential, because of the gentle slope which influences water to infiltrate. All the major towns and villages are located in good groundwater prospect areas. Therefore, these locations do not experience extreme drought conditions. The present work is valuable for future planning and management of groundwater resource in Hingoli district.
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Jangra Sumit,Dhall Heena,Aggarwal Shilpi,Mandal Bikash,Jain Rakesh Kumar,Ghosh Amalendu 한국응용곤충학회 2020 Journal of Asia-Pacific Entomology Vol.23 No.2
Thrips palmi is an important insect pest of vegetables and ornamental crops worldwide. Besides direct damage caused by feeding, it transmits several tospoviruses in a persistent-propagative manner. Eggs of T. palmi are microscopic and embedded within plant tissue by the sharp ovipositor of adult female. In the present study, an artificial oviposition setup has been standardized for T. palmi. Eggs of T. palmi were harvested in sterile water between two thin membranes. The developmental stages of T. palmi embryo were studied starting from oviposition up to hatching by inverted and confocal reflection microscopy. Energids were homogeneously distributed at an early stage of development. The anterior end of the egg curved with a constriction post 38 h. Initiation of tissue organization, mouthparts, appendages, compound eyes were observed at different time points. Appendages were well developed and segmentation was prominent post 70 h. The embryo was completely developed at around 80 h and hatched by 86 h post oviposition at 28 °C temperature. The study first time reports the embryonic development of T. palmi that would be helpful in detailed investigations of thrips developmental biology and evolution.
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Tatan Ghosh,Amarnath Chattopadhyay,Atis Chandra Mandal,Subhamay Pramanik,Sumit Mukherjee,Probodh Kumar Kuiri 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.12
Spectroscopic, microscopic and size dependent antibacterial efficiency of Ag nanoparticles (NPs) synthesized by green approach were studied. Five different samples of Ag NPs having average sizes in the range of ~14 to ~21 nm were synthesized using Psidium guajava (Guava) leaf extract (0.25ml, 0.5ml, 1ml, 2ml, 4ml, respectively) in 50ml aqueous AgNO3 solution of molar concentration of 1mM. The sizes of the NPs were found to increase with increase in concentration of leaf extract. Such increase in NP size is mainly due to the increase in biomolecules, in the solution, that transforms the Ag ions to Ag NPs. Spectroscopic and microscopic properties of as-synthesized Ag NPs were obtained by characterizing the prepared samples using suitable and affordable methodologies. These Ag NPs showed significant size dependent antibacterial effect. The minimum inhibitory concentration and minimum lethal concentration of the sample showing highest zone of inhibition against Escherichia coli (E. coli) was determined as 40 g/ml and 80 g/ml, respectively. Percentage of survivability was also measured through viable plate count. The smallest Ag NPs (average size ~14 nm) considered here produced the best antibacterial activity against the tested E. coli compared to Ag NPs having larger sizes at identical bacterial concentration. The enhanced antibacterial efficiency for smaller Ag NPs is mainly due to larger surface area-to-volume ratio of smaller NPs. The probable mechanism of bio-reduction of silver ions and formation of Ag NPs has also been well explained, which justifies the result obtained in this work.
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