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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.
FIXED POINT THEOREMS VIA FAMILY OF MAPS IN WEAK NON-ARCHIMEDEAN MENGER PM-SPACES
Deepak Singh,Amin Ahmed 한국수학교육학회 2013 純粹 및 應用數學 Vol.20 No.3
C. Vetro [4] gave the concept of weak non-Archimedean in fuzzy metric space. Using the same concept for Menger PM spaces, Mishra et al. [22] proved the common fixed point theorem for six maps, Also they introduced semi-compatibility. In this paper, we generalized the theorem [22] for family of maps and proved the common fixed point theorems using the pair of semi-compatible and reciprocally continuous maps for one pair and R¡weakly commuting maps for another pair in Menger WNAPM-spaces. Our results extends and generalizes several known results in metric spaces, probabilistic metric spaces and the similar spaces.
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.
Control and Path Planning of Quadrotor UAV using Fuzzy PID
Deepak Gautam,CheolKeun Ha(하철근) 제어로봇시스템학회 2012 제어로봇시스템학회 합동학술대회 논문집 Vol.2012 No.7
This paper presents the modeling, control strategy and path planning of four-rotor vertical takeoff and landing (VTOL) unmanned air vehicle (UAV) known as Quadrotor. The UAV’s Mathematical model is derived based on Newton-Euler formulation. Motor model is included for the better approximation of system. Aerodynamic, Coriolis, and gyroscopic effect are neglected. Fuzzy-PID is proposed for the pose (position and orientation) control of the vehicle. Conventional approach of controller design is adopted where linear controller is developed based on linearized dynamics and applied to the nonlinear model. Proposed controller utilizes the fuzzy rules and reasoning to tune the PID gains over certain range. Path planning is done using Dijkstra’s algorithm. For provided initial position, destination, environment and obstacles, Dijkstra’s algorithm calculates the shortest route through given environment whilst avoiding obstacles in the path. Proposed algorithms are simulated using Matlab/Simulink environment and results are presented.
Deepak K Dash,Tirtha Ghosh,Veerendra C Yeligar,K Murugesh,Siva S Nayak,Bhim C Maiti,Tapan K Maity 경희대학교 융합한의과학연구소 2007 Oriental Pharmacy and Experimental Medicine Vol.7 No.3
The present study was carried out to investigate the antihyperglycemic, antihyperlipidemic and antioxidant effect of chloroform and methanol extract of whole plant of Ichnocarpus frutescens (CEIF and MEIF) in streptozotocin (STZ)-induced diabetic rats. Administration of CEIF and MEIF orally at the dose of 200 mg/kg and 400 mg/kg body weight resulted in significant (P < 0.01) reduction in blood glucose levels. The body weights were significantly (P < 0.001) reduced in STZ-induced diabetic rats when compared to normal rats while the extracts significantly (P < 0.01) prevented the decrease in body weight in the CEIF and MEIF treated rats. The study was further undertaken to evaluate the antioxidant and antihyperlipidemic potential of CEIF and MEIF in STZ-induced diabetic rats. The increased levels of lipid peroxidation in the liver tissues of diabetic rats were significantly reverted back to normal levels and a significant increase in the activity of antioxidant enzymes such as superoxide dismutase, catalase and the level of reduced glutathione in the liver of diabetic rats after the treatment with CEIF and MEIF was noticed. These results clearly indicate that CEIF and MEIF exhibit significant antihyperglycemic, antihyperlipidemic and in vivo antioxidant activity in STZ-induced diabetic rats and the results were found to be in a dose dependent manner
Deepak Khurana,Rajesh Choudhary,Sudhakar Subudhi 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.8
In the present study, the effect of particle concentration, particle diameter and temperature on the thermal conductivity and viscosity of Al2O3/water nanofluids was investigated experimentally using design of experiment approach (full factorial design). Variables were selected at two levels each: particle concentration (0.1–1%), particle diameter (20–40 nm) and temperature (10– 40℃). It was observed that the thermal conductivity of the Al2O3/water nanofluids increases with increasing concentration and temperature and decreases with increase in particle diameter, while viscosity increases with increasing particle diameter. Results showed that the interaction effect of concentration and temperature also has significant effect on the thermal conductivity of Al2O3/water nanofluids. For viscosity, the interaction of particle diameter and temperature was important. Utility concept was used to optimize the properties collectively for better heat transfer performance. The optimal combination for high thermal conductivity and low viscosity was obtained at higher level of particle concentration (1%), lower level of particle diameter (20 nm) and higher level of temperature (40℃). At this condition the increment in thermal conductivity and viscosity compared to base fluid was 11.51% and 6.37%, respectively.
Deepak B. Pachpatte,Kavita U. Shinde 원광대학교 기초자연과학연구소 2017 ANNALS OF FUZZY MATHEMATICS AND INFORMATICS Vol.14 No.6
In this paper we prove a fuzzy integral inequality for $r_{1}$-convex function and $r_{2}$-convex function. Some examples satisfying results are also given.
Deepak Rajaram Patil,이쉥차이,김준희,남중희,조정호,김병익,김기훈 한국물리학회 2017 Current Applied Physics Vol.17 No.8
With increasing demands toward device miniaturization, Pb-free magnetoelectric laminates (MELs) with a small lateral dimension of ~3 3 mm2 have been synthesized by the tape-casting method. The MELs are composed of alternating layers of magnetostrictive NiFe2O4 and piezoelectric BaTiO3 with a uniform single layer thickness of t ¼ 50 and 15 mm, respectively. Both laminates exhibit much larger longitudinal ME voltage coefficient aE33 than the transverse ME voltage coefficient aE31 at both off-resonant and resonant frequencies, which is attributed to the preferential easy-plane alignment of the magnetic moments. Furthermore, enhancement in aE33 by more than 5 times has been achieved upon decreasing t from 50 to 15 mm in both resonance and off-resonance conditions. The enhanced aE33 values indicate that nearly ideal interface coupling between the ferromagnetic and piezoelectric layers is realized in the miniaturized, thinner MEL, pointing to practical application potential towards developing massproduced, low-cost ME devices.