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Vinay Gupta,Om P. Bahl,Rakesh B. Mathur 한국탄소학회 2010 Carbon Letters Vol.11 No.1
The synthesis of C60@MWCNT was carried out at room temperature (~25℃) from arc-discharge prepared Multi-wall carbon nanotubes (MWCNTs). They were oxidized and acid treated for tube opening. Then C60 molecules were encapsulated into MWCNTs by wetting them with C60-toluene solution for several minutes followed by ultrasonification. C60@MWCNT was cleaned by pure toluene to remove any excess C60. C60@MWCNT was characterized by electron microscopy, which showed large scale filling of C60 into MWCNTs. It was observed that the mechanism of insertion of C60 into MWCNTs may be due to the capillary suction at the opening ends of MWCNTs.
Dynamics and actuating torque optimization of planar robots
Vinay Gupta,Himanshu Chaudhary,Subir K. Saha 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.7
An optimization methodology is presented for design of serial-chain planar robots for minimizing torque at joints, when its endeffectoris supposed to move on a prescribed path. In particular, the end-effector of the robot is allowed to move on a circular path. Forthe respective joint trajectories, the weighted sum of root mean square (RMS) of the actuating torques is minimized by the mass redistributionof the links. To achieve the goal, the DeNOC (Decoupled natural orthogonal complement) based dynamics was formulated byrepresenting the rigid links as a set of rigidly connected point-masses known as equimomental system. The methodology is illustratedusing a planar two-degree-of-freedom (DOF) robot with two revolute joints.
Vinay Kumar Jadoun,Nikhil Gupta,Khaleequr Rehman Niazi,Anil Swarnkar 대한전기학회 2015 Journal of Electrical Engineering & Technology Vol.10 No.5
This paper presents an Enhanced Particle Swarm Optimization (EPSO) to solve short-term hydrothermal scheduling (STHS) problem with non-convex fuel cost function and a variety of operational constraints related to hydro and thermal units. The operators of the conventional PSO are dynamically controlled using exponential functions for better exploration and exploitation of the search space. The overall methodology efficiently regulates the velocity of particles during their flight and results in substantial improvement in the conventional PSO. The effectiveness of the proposed method has been tested for STHS of two standard test generating systems while considering several operational constraints like system power balance constraints, power generation limit constraints, reservoir storage volume limit constraints, water discharge rate limit constraints, water dynamic balance constraints, initial and end reservoir storage volume limit constraints, valve-point loading effect, etc. The application results show that the proposed EPSO method is capable to solve the hard combinatorial constraint optimization problems very efficiently.
Numerical investigation of a star's trajectory in binary Quasar system
VINAY KUMAR,BEENA R GUPTA,RAJIV AGGARWAL 장전수학회 2016 Advanced Studies in Contemporary Mathematics Vol.26 No.3
In this paper, we have considered Time-Frequency analysis (TFA) based on wavelets for the identification and classification of trajectories in a nonlinear dynamical model. Time-Frequency Analysis (TFA) is the relatively fast method. Ridge-plots (Time-frequency landscape) obtained from Time-Frequency Analysis (TFA) extracts instantaneous frequency from the phase of continuous wavelet transform (CWT). The nonlinear model considered in the analysis is the binary system of quasars hosted in the pair of interacting disk galaxies introduced recently. We have characterized the different type of trajectories like periodic, quasi-periodic, chaotic sticky, chaotic non-sticky, weakly and strongly chaotic. We have shown a comparative study between Time-Frequency Analysis (TFA) and a well-established method Lyapunov Characteristic Exponent (LCE). We have also presented the graphs explaining the phenomenon of transient chaos and resonance trapping.
Estimation of glacial retreat and mass loss in Baspa basin, Western Himalaya
Vinay Kumar Gaddam,Anil V. Kulkarni,Anil Kumar Gupta 대한공간정보학회 2016 Spatial Information Research Vol.24 No.3
Glaciers are one of the valuable natural resources in Indian Himalaya. A large number of people depend on glacier melt for social and industrial activities. Therefore, monitoring the glacial changes becomes crucial. In the present study, retreat and mass balance of 19 glaciers in Baspa basin were analysed. An overall de-glaciation of 24 % (41.1 ± 8.37 km2) was observed between 1962 and 2014. Mass balance was estimated by Accumulation Area Ratio and Equilibrium Line Altitude (ELA) methods. The mean ELA estimate varies between 5147 ± 178 and 5405 ± 173 m. Negative mass balance was observed and the estimated mass loss is 3.6 mega tonne (3.6 9 106 m3), for a period of 9 years between 1998 and 2014. In addition, temperature and precipitation data obtained at Rackham observatory (3050 m) were analysed for a period of 29 years, between 1984 and 2013. The analysis showed an increasing trend in annual mean temperature, decreasing trend in precipitation and a higher rise in minimum temperatures of both summer and winter. Thus, the overall observations suggest continuous loss of glacier area and mass, which may influence the glacier’s health and run-off in Baspa basin.
Jadoun, Vinay Kumar,Gupta, Nikhil,Niazi, K. R.,Swarnkar, Anil The Korean Institute of Electrical Engineers 2015 Journal of Electrical Engineering & Technology Vol.10 No.5
This paper presents an Enhanced Particle Swarm Optimization (EPSO) to solve short-term hydrothermal scheduling (STHS) problem with non-convex fuel cost function and a variety of operational constraints related to hydro and thermal units. The operators of the conventional PSO are dynamically controlled using exponential functions for better exploration and exploitation of the search space. The overall methodology efficiently regulates the velocity of particles during their flight and results in substantial improvement in the conventional PSO. The effectiveness of the proposed method has been tested for STHS of two standard test generating systems while considering several operational constraints like system power balance constraints, power generation limit constraints, reservoir storage volume limit constraints, water discharge rate limit constraints, water dynamic balance constraints, initial and end reservoir storage volume limit constraints, valve-point loading effect, etc. The application results show that the proposed EPSO method is capable to solve the hard combinatorial constraint optimization problems very efficiently.
Charge carrier dynamics in PffBT4T-2OD: PCBM organic solar cells
Sharma, Ramakant,Gupta, Vinay,Lee, Hyunwoo,Borse, Kunal,Datt, Ram,Sharma, Chhavi,Kumar, Mahesh,Yoo, Seunghyup,Gupta, Dipti Elsevier 2018 ORGANIC ELECTRONICS Vol.62 No.-
<P><B>Abstract</B></P> <P>We investigate the charge carrier dynamics of inverted organic solar cells (OSCs) based on PffBT4T-2OD: PCBM and PTB7: PCBM – the two leading systems among the OSCs based on polymer-fullerene bulk-heterojunction – to elucidate the origin of their performance difference. Transient absorption spectroscopy (TAS) and photo-electrochemical impedance spectroscopy (photo-EIS) were employed to unravel the photo-physics that govern the cell operation of these two highly efficient bulk heterojunction OSCs. While photo-EIS indicates that the two systems under study exhibit similar behavior in terms of recombination, TAS results reveal that PffBT4T-2OD: PCBM systems not only have higher charge generation rate but also more efficient charge transfer than PTB7: PCBM systems, leading to the power conversion efficiency of PffBT4T-2OD: PCBM-based OSCs (9.16%) that is higher than that of PTB7: PCBM-based OSCs (6.44%).</P> <P><B>Highlights</B></P> <P> <UL> <LI> Charge carrier dynamics of PffBT4T-2OD: PCBM and PTB7: PCBM OSCs have been compared. </LI> <LI> TAS and Photo-EIS measurements along with optical simulation were carried out. </LI> <LI> Higher PCE for PffBT4T-2OD: PCBM OSCs is due to better absorption and carrier collection efficiency. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>