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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.
On a new class of functions related with Mittag-Leffler and Wright functions and their properties
Deepak Bansal,KHALED MEHREZ 대한수학회 2020 대한수학회논문집 Vol.35 No.4
In the present paper, we define new class of functions \linebreak $T_{\alpha, \beta}(\lambda;z)$ which is an extension of the classical Wright function and the Mittag-Leffler function. We show some mean value inequalities for the this function, such as Tur\'{a}n-type inequalities, Lazarevi\'{c}-type inequalities and Wilker-type inequalities. Moreover, integrals formula and integral inequality for the function $T_{\alpha, \beta}(\lambda;z)$ are presented.
Detection of Sybil Attacks Using Improved AODV Protocol in Vehicular Ad Hoc Networks
Deepak Prashar,Abdirahim A. Abshir,Amandeep Nagpal 한국디지털융합학회 2020 IJICTDC Vol.5 No.1
Vehicular ad hoc network (VANET) has become most predominant on account of their usage in a vehicle to vehicle communication. But one of the major challenges in this network is the mobility of nodes involves in the communication. Either single-hop or multi-hop communication is used within the vehicle to vehicle communication. There are reactive, proactive, and hybrid routing protocols that are generally used within the multi-hop communication and for the path establishment, a reactive routing protocol named AODV is primarily used. Because of the decentralized nature of the network, there is a possibility of various attacks that reduce the performance of the network. One of the most devastating attacks is the Sybil attack which destroys the privacy of networks. This paper proposes a novel approach for the detection and isolation of the malicious nodes that are responsible for causing Sybil attack in VANETs through an improvement in the AODV protocol and thus the overall performance of the network is improved. Moreover, the proposed approach is compared with the existing one in terms of metrics like delay, packet loss, overhead, and throughput using the network simulator. Results confirmed that the proposed approach is quite effective in handling the network under the impact of a Sybil attack.
Design, Synthesis In Vitro Anticancer Activity and Docking Studies of (−)-Catechin Derivatives
Deepak Kumar,S. J. Harshavardhan,Sridhar Chirumarry,Y. Poornachandra,장기완,C. Ganesh Kumar,윤용진,Bao-Xiang Zhao,Jun-Ying Miao,신동수 대한화학회 2015 Bulletin of the Korean Chemical Society Vol.36 No.2
Novel series of ()-catechin derivatives 1a-l were synthesized, characterized and assayed for their cytotoxicity against four selected human cancer cell lines by standard MTT assay method. Most of the compounds significantly active among which 1d exhibited promising activity with IC50 values of 2.5, 4.8 and 5.4 μM specifically against hepatocellular liver carcinoma (HepG2), lung adenocarcinoma (A549) and prostate (DU-145) cell lines, while compound 1j showed promising cytotoxicity against human breast adenocarcinoma MDA-MB-231 (IC50 value of 6.6 μM). Compounds 1a, 1d, 1e, 1f and 1j exhibited broad spectrum cytotoxicity against all the cell lines screened. Molecular docking studies of compound 1d established the good binding affinity and are in favor of the observed biological activity. These data collectively suggest that compound 1d could serve as a new template for further optimization as anticancer agent.
Deepak Kumar,Sridhar Chirumarry,B. V. D. Vijaykumar,S. J. Harshavardhan,장기완,이동하,신동수 대한화학회 2015 Bulletin of the Korean Chemical Society Vol.36 No.4
An efficient synthesis of (3Z,6Z)-cis-9,10-epoxy-3,6-henicosadiene (1), the major component of sex pheromone of saltmarsh caterpillar moth Estigmene acrea (Drury), was accomplished from commercially available pentadec-3-yn-1-ol and bromoundecane. Chirality was introduced by employing Sharpless asymmetric dihydroxylation on cis-olefin intermediate in the synthesis of 1, for the first time. The other key reactions include metal-dissolving coupling, Lindlar's catalyst-assisted partial hydrogenation, one-pot, three-step epoxidation from vicinal diol, and Wittig olefination. The overall yield of 1 was 24.7% in eight steps. The efficiency and simplicity of this synthesis allow the potential use of pheromone 1 in pest management programs.
Antimicrobial and docking studies of (2)-catechin derivatives
Deepak Kumar,M. Poornima,R. N. Kushwaha,원태진,안철진,C. Ganesh Kumar,장기완,신동수 한국응용생명화학회 2015 Applied Biological Chemistry (Appl Biol Chem) Vol.58 No.4
Antimicrobial activities of (-)-catechin derivatives were assayed for their antibacterial and antifungal activities against gram positive, gram negative bacteria, and fungi. Most of the compounds significantly active among which Compounds 1a, 1b, and 1c showed excellent antibacterial for both gram negative and gram positive bacteria, these compounds also exhibited excellent antifungal activity more than the standard drug. Molecular docking studies of Compounds 1a and 1b established good binding affinity with ATP-binding pocket of DNA gyrase and are in favor of the observed biological activity. These data collectively suggest that Compounds 1a and 1b could serve as a novel antimicrobial agent.
Deepak Kumar,C. M. Raghavan,Ch. Sridhar,신지항,류성훈,장기완,신동수 대한화학회 2015 Bulletin of the Korean Chemical Society Vol.36 No.8
In this study, a facile, fast, and cost-effective method for the synthesis of high-quality reduced graphene oxide sheets is reported by a microwave-assisted chemical reduction using hydroiodic acid/acetic acid as reducing agent. Exposure of graphene oxide (GO) with microwave irradiation (4 and 7 h) was found to be more rapid and sustainable reduction as compared to that of the conventional chemical reduction process (48 h). Formation of high-quality microwave-assisted reduced GO (mrGO) was ensured by means of electron microscopies, Raman, and infrared spectroscope studies. Furthermore, the antibacterial activity was evaluated for the mrGO, which showed good inhibitory effect against both Gram positive and Gram negative bacteria.
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.