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Pavan Kalyan Kota,Govindaraju Myilsamy,Vaira Vignesh Ramalingam 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.6
Integration of two metallurgically distinct materials (bimetallic) is an inevitable advancement in the automotive andmarine field. In this context, this study investigates the fabrication, characterization, and properties of solid–liquid compoundcast aluminum alloy AA5052 and ferrous alloy (mild steel and galvanized iron) based bimetallic materials. Microstructuralevolution, microhardness, and tensile strength of the developed bimetallic material are investigated. The results show thatthe formation of cracks at the interface in AA5052/Mild Steel caused the joint failure in the course of preliminary testing. InAA5052/Galvanized Iron, the growth of intermetallics at the oxide-free steel surface results in a shear strength of 19.9 MPa. XRD analysis attests to the presence of brittle intermetallics and Al bond at the interface of AA5052/Galvanized Iron bimetallicmaterial, which in turn confirms the development of a metallurgical.
( Kalyan Ramesh ),( Sonita A. P. Siboro ),박찬,임권택 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
In the present study, a series of amphiphilic AB2-type miktoarm star block copolymers consisting of hydrophobic poly(L-lactide) (PLLA) as a A arm and hydrophilic poly(N-acryloylmorpholine) (PNAM) as two B arms were synthesized via the combination of ring opening polymerization and xanthate-mediated reversible addition-fragmentation chain transfer polymerization. Resultant polymers were analyzed by 1H NMR spectroscopy and gel permeation chromatography. Aggregation properties of the amphiphilic miktoarm star block copolymers were studied by fluorescence spectroscopy, transmission electron microscopy and dynamic light scattering. Doxorubicin (DOX)was successfully loaded into the miktoarm star block copolymer micelles. The result revealed that DOX release was enhanced as the pH reduced from 7.4 to 6.4.
Derivations with Nilpotent Values on Γ-rings
Kalyan Kumar Dey,Akhil Chandra Paul,Bijan Davvaz 한국수학교육학회 2014 純粹 및 應用數學 Vol.21 No.4
Let M be a prime Γ-ring and let d be a derivation of M. If there exists a fixed integer n such that (d(x)α)ⁿd(x) = 0 for all x ∈ M and α∈Γ, then we provethat d(x) = 0 for all x ∈ M. This result can be extended to semiprime Γ-rings.
An efficient robust cost optimization procedure for rice husk ash concrete mix
Kalyan K. Moulick,Soumya Bhattacharjya,Saibal K. Ghosh,Amit Shiuly 사단법인 한국계산역학회 2019 Computers and Concrete, An International Journal Vol.23 No.6
As rice husk ash (RHA) is not produced in controlled manufacturing process like cement, its properties vary significantly even within the same lot. In fact, properties of Rice Husk Ash Based Concrete (RHABC) are largely dictated by uncertainty leading to huge deviations from their expected values. This paper proposes a Robust Cost Optimization (RCO) procedure for RHABC, which minimizes such unwanted deviation due to uncertainty and provides guarantee of achieving desired strength and workability with least possible cost. The RCO simultaneously minimizes cost of RHABC production and its deviation considering feasibility of attaining desired strength and workability in presence of uncertainty. RHA related properties have been modeled as uncertain-but-bounded type as associated probability density function is not available. Metamodeling technique is adopted in this work for generating explicit expressions of constraint functions required for formulation of RCO. In doing so, the Moving Least Squares Method is explored in place of conventional Least Square Method (LSM) to ensure accuracy of the RCO. The efficiency by the proposed MLSM based RCO is validated by experimental studies. The error by the LSM and accuracy by the MLSM predictions are clearly envisaged from the test results. The experimental results show good agreement with the proposedMLSMbased RCO predicted mix properties. The present RCO procedure yields RHABC mixes which is almost insensitive to uncertainty (i.e., robust solution) with nominal deviation from experimental mean values. At the same time, desired reliability of satisfying the constraints is achieved with marginal increment in cost.
A Novel Mesh-Based Moving Object Detection Technique in Video Sequence
Kalyan Goswami,Gwang-Soo Hong,Byung-Gyu Kim 한국정보기술융합학회 2013 JoC Vol.4 No.2
Moving object detection in a video sequence is one of the most challenging research topics due to its various applications and complexity. Sometimes, it is also required to identify a moving object without any previous information about its shape or motion. In this paper, we introduce a global mesh generation technique which can construct a hierarchical mesh on moving object(s) inside a video frame. This technique is efficient enough to solve the problem to a great extent and can identify a moving object in a video frame without any previous knowledge. The generated mesh is triangular and probabilistic in nature. The granularity of the mesh depends upon the level of hierarchy, neighborhood triangle decomposition, gradient and temporal information of the video sequence. Experiments show that the proposed method can identify the moving object(s) with good accuracy without any pre or post-processing steps.