Bézier variant of mixed summation-integral type operators

Dewangan,Jyoti Sinha 장전수학회 2010 Advanced Studies in Contemporary Mathematics Vol.20 No.2

The present paper deals with Bezier variant of certain mixed summation-integral type operators, having different basis functions in sum-mation and integration. We estimate the rate of convergence for these op-erators Sn,α(f, x), for functions having derivatives of bounded variation.

Applications of fixed point theory in Hilbert spaces

Kiran Dewangan 강원경기수학회 2024 한국수학논문집 Vol.32 No.1

In the presented paper, the first section contains strong convergence and demiclosedness property of a sequence generated by Karakaya et al. iteration scheme in a Hilbert space for quasi-nonexpansive mappings and also the comparison between the iteration scheme given by Karakaya et al. with well-known iteration schemes for the convergence rate. The second section contains some applications of the fixed point theory in solution of different mathematical problems.

FIXED POINTS OF MULTI-VALUED OSILIKE-BERINDE NONEXPANSIVE MAPPINGS IN HYPERBOLIC SPACES

Kiran Dewangan,Niyati Gurudwan,Laxmi Rathour 경남대학교 기초과학연구소 2023 Nonlinear Functional Analysis and Applications Vol.28 No.3

This paper is concerned with fixed point results of a finite family of multi-valued Osilike-Berinde nonexpansive type mappings in hyperbolic spaces along with some numerical examples. Also strong convergence and $\Delta-$convergence of a sequence generated by Alagoz iteration scheme are investigated.

Influence of Stacking Sequence and Orientation on Tensile and Flexural Properties of Jute/glass/carbon Fiber Epoxy-based Hybrid Composites

Rajesh Kumar Dewangan,Samarjit Singh,Biplab Das,Manish Bhaskar,Pradeep Patanwar,Pankaj Kumar Gupta,Sung Soo Han(한성수),Rakesh Bhaskar 한국고분자학회 2023 폴리머 Vol.47 No.5

FEA of Plain Woven Kevlar/Epoxy Composites Subjected to Normal and Oblique Impact with Multi-Scale Modelling

Mithilesh Kumar Dewangan,S. K. Panigrahi 한국섬유공학회 2020 Fibers and polymers Vol.21 No.12

High-performance Kevlar/epoxy plain woven composites are subjected to normal and oblique impact by a conicalcylindricalprojectile. A multiscale modelling method which incorporates Micro-Meso-Macro transition approach isimplemented to study the ballistic impact phenomena. This Macro Homogeneous-Meso heterogeneous modelling techniquehas been executed in this examination to develop the intricate weave design of the objective plate. A voxel-based nonconformalwork has been utilized to comprehend the behavior of Representative Volume Element (RVE). The damageproperties are implemented utilizing a user-defined function for the explicit analysis. The model is approved with theavailable literary works for Kevlar and carbon composites to feature the thorough inclusion of the technique. The model isconsidered for different oblique angles (0 °, 30 °, 45 °, 60 °) and its effects on energy absorption, damage mechanism andresidual velocity are observed.

Material Flow Behavior and Mechanical Properties of Dissimilar Friction Stir Welded Al 7075 and Mg AZ31 Alloys Using Cd Interlayer

Satya Kumar Dewangan,M. K. Tripathi,M. K. Manoj 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.5

Friction Stir Welding (FSW) has great potential over fusion welding for joining dissimilar alloys. However, formation ofintermetallic compounds (IMCs) Al12Mg17and Al3Mg2in FSW of Al/Mg alloys is almost unavoidable and problematic forthe research community. Such IMCs in the form of continuous layer provide easy crack propagation path which increasesbrittleness and reduces the joint strength of the weld. To improve the material flow behavior and reducing brittleness, accurateand precise attempts were taken to join two dissimilar alloys i.e. Al 7075 and Mg AZ31 with the incorporation of cadmiuminterlayer first time. Tool rotational speed of 1300 rpm and traverse speed of 20 mm/min were maintained throughout thewelding process. Various phase formation and their distribution in the nugget zone has been studied in details by using opticalmicroscopy, SEM–EDS and XRD. The supersaturated solid solution (SSSS) of Mg in Al, and a thin layer of Al3Mg2andsmall particles (~ 1 μm) of Al12Mg17have been observed in the stir zone. During processing Cd reacted with Mg and formedCdMg and CdMg3which have been distributed in the upper-middle portion of Mg region as intercalated lamellar structure. Formation of these compound provided micro-mechanical interlocking. Further, Al material has been found to be depositedinto the Mg region in the form of elongated balloon which provided anchoring effect due to mechanical interlocking. Themaximum tensile strength achieved is 129 MPa which is higher than the previously reported dissimilar FSW of Al 7xxxseries alloy with Mg alloy. Fractographic study of the dissimilar FSW tensile sample was carried out to understand crackpropagation path and scope for further improvement in the weld joint strength.

Residual stress analysis of swage autofrettaged gun barrel via finite element method

Mithilesh Kumar Dewangan,S. K. Panigrahi 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.7

Residual stress analysis of swage autofrettaged gun barrel is performed in this study via finite element (FE) method. The swage autofrettagetechnique is one of the modernized pre-stressing methods to enhance the load bearing capacity and fatigue life of all gun barrels. An oversized moving mandrel is forced inside the gun barrel, which deforms the material through physical interference. The process isanalyzed by evaluating residual stresses using a commercially available software package. The deformation effects caused by the mandreland the geometrical variation of the mandrel on the gun barrel are analyzed in this study. This field has been insufficiently researched,but the effect of pre-stressing on the barrel, and at the start and mid-length for the swaging process, is not well examined. Thus, furtheranalysis is required. The variations and effectiveness of the designed pressure band model are shown to define the problem easily. Resultsare evaluated at mid-length using a fixed fringe width percentage (A defined percentage of gun barrel axial length). The desired effectsare well validated through numerical investigation using FE analysis. This study reveals that the geometry should be designed very thoroughlyto determine the after effects. If too many variations occur, then the initial force requirement is extremely high; otherwise, thedesired swaging effect cannot be achieved.

Multiscale Modelling of 3D Orthogonal Woven Composite under Ballistic Impact Using FEM

Mithilesh Kumar Dewangan,S. K. Panigrahi 한국섬유공학회 2020 Fibers and polymers Vol.21 No.10

The present paper deals with the multi-scale modelling and finite element analysis of Kevlar/Epoxy 3DOrthogonal woven composite (3DOWC) subjected to ballistic impact by a conical-cylindrical steel projectile. These aredesigned by utilising a Micro-Meso-Macro transition approach called Macro Homogeneous-Meso heterogeneous modellingtechnique. The Micro-Meso-Macro transition approach has been implemented in this research to develop the complex weavearchitecture of the target plate, and, a voxel-based non-conformal mesh has been used to understand the behaviour ofRepresentative Volume Element (RVE). The model is validated by using 2D weave architecture which has been analysed forconical 90 º projectile made up of 7.62 calibre. The damage properties are implemented using a user-defined function in theexplicit analysis VUMAT. The Macro homogeneous results provide the velocity variation and energy absorption of theprojectile with respect to the time history. Also, the energy absorption by its constituents are presented here, and substantialvalidation of results have been observed with the available literature.

Big Data Technology In Health and Biomedical Research: A Literature Review

Revati Raman Dewangan,Deepali Thombre,Chitranjan Patel 보안공학연구지원센터 2016 International Journal of Database Theory and Appli Vol.9 No.11

Big data and hadoop technologies are used for biomedical and health-care informatics research purpose. Huge information advances are progressively utilized for biomedical and medicinal services informatics research. A lot of natural and clinical information have been produced and gathered at a remarkable speed and scale. For instance, the new era of sequencing innovations empowers the expert cessing of billions of DNA grouping information every day, and the use of electronic health records (EHRs) is reporting a lot of patient information. The expense of securing and examining biomedical information is relied upon to diminish drastically with the assistance of innovation overhauls, for example, the rise of new sequencing machines, the improvement of novel equipment and programming for parallel processing, and the broad extension of EHRs. Huge information applications show new chances to find new learning and make novel techniques to enhance the nature of human services. The utilization of enormous information in social insurance is a quickly developing field, with numerous new disclosures and procedures distributed in the most recent five years. In this paper we present different areas of biomedical fields like bioinformatics, clinical informatics, imaging informatics, and general health care informatics. In particular, in bioinformatics, high-throughput tests encourage the exploration of new expansive affiliation investigations of ailments, and with clinical informatics, the clinical field profits by the boundless measure of gathered patient information for settling on savvy choices. Imaging informatics is presently all the more quickly incorporated with cloud stages to share therapeutic picture information and work processes, and general wellbeing informatics influences huge information methods for foreseeing and observing irresistible illness flare-ups, for example, Ebola. In this paper, we survey the late advance and leaps forward of enormous information applications in these human services areas and compress the difficulties, holes, and chances to enhance and progress huge information applications in social insurance.

Application of Artificial Neural Network to Predict the Crystallite Size and Lattice Strain of CoCrFeMnNi High Entropy Alloy Prepared by Powder Metallurgy

Cheenepalli Nagarjuna,Sheetal Kumar Dewangan,Ashutosh Sharma,Kwan Lee,홍순직,안병민 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.7

An equiatomic CoCrFeMnNi high entropy alloy (HEA) was prepared by the gas atomization process. In addition, highenergymilling was carried out to study the effects of milling parameters on the morphology and crystallographic propertiesof HEA powders. Phase identification and morphology of milled powders were observed by X-ray diffraction and scanningelectron microscopy, respectively. Both the atomized and milled powders exhibited a single-phase face-centered cubic solidsolution. The resultant crystallite size (CS) and lattice strain (LS) of milled HEAs were estimated using the WilliamsonHall method and predicted using an artificial neural network (ANN) approach. With increasing the milling time from 0 to240 min, the CS decreased from 39.7 to 6.56 nm and the LS increased from 0.25%–1.48%, respectively. Furthermore, thedeveloped ANN modeling provides an excellent method for the prediction of the CS and LS with excellent accuracies of96.25% and 93.43%, respectively.