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Deepak Patel,Prasenjit Biswas,Anil Kumar,Hiren R. Kotadia,Archana Mallik,Sanjeev Das 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.7
The present investigation focuses on grain refinement in pure aluminum and its alloy under mechanical stirring with a verylow degree of forced convection of 800 rpm as compared to reported values of up to 8000 rpm during direct chill castingprocess (DC). Commercially pure aluminum (99.7%) and Al6082 alloy billets were fabricated in an in-house designed DCcasting simulator. Mechanical forced convection (MFC) was applied to the melt during casting by a common four-bladedimpeller. The microstructural properties of the as-cast billets have been analysed to study the effect of MFC during casting andsolidification. The structure of both Al and its alloy is found to be refined in presence of MFC as compared to conventionalDC. A combination of simulation, experimental and theoretical approaches has been used to determine the effect of MFCin melt-temperature distribution to propose the mechanism of grain refinement. It has been observed that MFC prominentlyreduces the temperature gradient and extends undercooling time, resulting in fine grain structure.
Deepak Kumar Samal,Yashobanta Kumar Mohanty,Gopendra Kishore Roy 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.6
We studied the hydrodynamics of a gas-liquid-solid semi-fluidized bed relating to packed bed formation and bed pressure drop with irregular homogeneous binary mixtures in a 0.05 m internal diameter Perspex column, with water and air (secondary) as fluidizing medium at constant static bed height of 0.08 m. A homogeneous binary mixture has been taken for easy formation of a semi-fluidized bed. Air is supplied centrally below the bottom grid in radial direction with a special design air sparger after the bed is first fluidized by the liquid. Experimental parameters studied included superficial gas and liquid velocities, average particle size and density and the bed expansion ratio. Empirical and semi-empirical models were developed. The calculated values from predicted models were compared with the experimental values and fairly good agreement was obtained.
Some Integrals Involving Kampé de Fériet's Series and I-function
Deepak Jain ...et al KYUNGPOOK UNIVERSITY 1996 Kyungpook mathematical journal Vol.36 No.1
In the present paper some integrals involving Kampé de Fé eriet's series and I-function have been evaluated. Some integrals involve Jacobi polynomials also. These integrals can be used effectively in the solution of heat conduction equation under given boundary conditions.
Experimental investigation of pug cutter embedded TIG welding of Ti-6Al-4V titanium alloy
Deepak Kumar Gope,Uday Kumar,Somnath Chattopadhyaya,Sanjoy Mandal 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.6
Light-weight materials, such as titanium alloy, have been extensively investigated. This paper primarily focuses on microstructural, metallurgical, and mechanical properties of the pug cutter embedded tungsten inert gas (TIG) welding of Ti-6Al-4V titanium alloy. In this work, TIG welding was modified to control the speed and the arc length. Analysis revealed that the microstructure underwent severe changes at different zones: coarsened in the fusion zone (FZ) and enlarged in the heat-affected zone (HAZ). The microstructure was finer at the base metal than those in the FZ and the HAZ, and the Vickers hardness values decreased from weld center line to the base metal. Tensile test showed that the specimen with low current and high speed was broken below its ultimate tensile strength, whereas most of the samples were broken at the base metal region that had a similar strength to that of the parent metal. The elongation of the metal was primarily affected by the heat input. A high volume of heat increased the hardness and the brittleness, resulting in low ductility.
Deepak Dewaji Barsagade,Ganesh Bhagwat GATHALKAR 한국곤충학회 2016 Entomological Research Vol.46 No.4
A new scientific survey elucidates the preferred attack of stink bug Canthecona furcellata (Wolff.) (Hemiptera: Pentatomidae) on the spinning stage of the tropical tasar silkworm, Antheraea mylitta (Drury) (Lepidoptera: Saturniidae). The silkworm A. mylitta produces an excellent quality of wild silk; however, due to predation by C. furcellata, tasar silk production is reduced. The bug C. furcellata is the most invasive larval predator of A. mylitta and predation is high during early instars as well as the molting stage of the larvae. However, for the first time it is reported that the spinning stage is also preferable for attack by the stink bug. Both the nymphs and adults of C. furcellata attack the spinning silkworm; moreover, stink bug attack is observed in groups under field conditions. It is postulated that feeding preference is due to the concealed, non‐movable and less defensive stage of the tasar larvae during spinning. The predation of C. furcellata includes its approach on target larva of the tasar silkworm during spinning, where it inserts the proboscis inside the larval skin through the moist silk network of newly forming or formed cocoon. Most of the spinning larvae die from the attack and the normal seed cocoon fails to form. The mechano‐ and chemoreceptors, present on the antenna and proboscis of C. furcellata, play an important role in prey locating and the feeding mechanism. The life cycle of C. furcellata is also discussed in the present study.
DEEPAK JAIN,Sanjay Kumar,정찬용 한국수학교육학회 2019 純粹 및 應用數學 Vol.26 No.2
In this paper, we prove some common xed point theorems for pairs of weakened compatible mappings (subcompatible and occasionally weakly compatible mappings) satisfying a generalized ϕ-weak contraction condition involving various combinations of the metric functions. In fact, our results improve the results of Jain et al. [6]. Also we provide an example for validity of our results.
Deepak Kumar,Jin-Hwe Kweon,Jin-Ho Choi 한국항공우주학회 2013 한국항공우주학회 학술발표회 논문집 Vol.2013 No.11
Low velocity impact is considered potentially dangerous for a composite structure mainly because, the damage in the form of delamination and matrix cracking. To be able to assess the critical nature of the induced damage, a thorough study of damage mechanism is needed. The main challenge is to predict damage initiation and propagation of low velocity impact-induced damage by the use of damage mechanism. For the damage evolution law, stress and fracture mechanics based failure criteria is applied. Damage model is implemented in FEM code ABAQUS. The results show good agreement with the existing experimental results.
Deepak Kumar Nayak,S. K. Paik ray,A. K. Sahoo 장전수학회 2023 Proceedings of the Jangjeon mathematical society Vol.26 No.3
An Fuzzy EOQ Model for deteriorating items having time dependent demand under partially backlogged shortages