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( Jinxing ),이성빈,황윤경,원종구,김지만,김지만 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
The recently, researcher has revealed manifold benefits of the heteroatom doping of carbon in physicochemical properties, which led to the improved performances in electrochemical capacitance for capacitors. The heteroatoms (B, N, O, P, S etc) or functional groups (carboxyl, ether, phenol, quinine, ketone, pridinic-N, pyridone-N, etc.) on the porous carbon wall can improve the wettability, contribute pseudocapacitance, and sometimes also enlarge the potential window. As continuation of our previous studies, herein, we report the facile synthesis of phosphorus doped ordered mesoporous carbon (P-OMC). The P-OMC was found to display the best capacitor with a highest specific capacitance of 358 F/g and 322 F/g in 0.5M H2SO4 and 0.1M KOH, respectively.
On elastic and plastic length scales in strain gradient plasticity
Jinxing Liu,Wen Wang,Ziyu Zhao,Ai Kah Soh 국제구조공학회 2017 Structural Engineering and Mechanics, An Int'l Jou Vol.61 No.2
The Fleck-Hutchinson theory on strain gradient plasticity (SGP), proposed in Adv. Appl Mech 33 (1997) 295, has recently been reformulated by adopting the strategy of decomposing the second order strain presented by Lam et al. in J Mech Pays Solids 51 (2003) 1477. The newly built SGP satisfies the non negativity of plastic dissipation, which is still an outstanding issue in other SGP theories. Furthermore, it explicitly shows how elastic strain gradients and corresponding elastic characteristic length scales come into play in general elastic-plastic loading histories. In this study, the relation between elastic length scales and plastic length scales is investigated by taking wire torsion as an example. It is concluded that the size effects arising when two sets of length scales are of the same order are essentially elastic instead of plastic.
Multi-Modal Stress Characteristics Under Coupling Effect of Strip and Work Roll
Jinxing Cui,Yan Peng,Jianliang Sun,Boyang Li 한국정밀공학회 2021 International Journal of Precision Engineering and Vol.22 No.10
In this paper, we investigate the rolling interface instability characteristics caused by the coupled motion of strip and the roll system. Based on the experimental test, the dynamical behaviors of the rolling mill under the motion of roll system and the strip show multi-modal vibration phenomenon, which are consistent with the variation of rolling interface force and energy parameters. Then, the dynamic geometric parameters of rolling interface and the dynamic stress models are established. Through the simulation analysis, it can be concluded the multi-modal stress state of the rolling interface is caused by the coupling motion of the strip and the roll system. The results show that the multi-modal stress of the rolling interface cause the rolling process instability, leading the "pulling " on the strip and "beating" on the work roll, which change the instability state of the rolling process. This study provides a theoretical basis for the study of multi-modal vibration characteristics of rolling mill.
Tunneling Enhanced Structure for Improving the Performance of Ultraviolet Light-emitting Diodes
Jinxing Wu,Peixian Li,Xiaowei Zhou 대한전자공학회 2020 Journal of semiconductor technology and science Vol.20 No.6
The novel AlGaN-based ultraviolet light-emitting diode (UV-LED) with a tunneling enhancement structure is proposed. The tunneling enhanced structure consists of an ITO layer, an extremely thin AlN layer, and a p+-GaN layer. Under forward bias, compared to traditional devices, tunneling enhanced UV-LEDs can shorten the width of the tunneling region. In addition, the dielectric constant of the AlN layer in the tunnel area is small, which can effectively increase the transport of holes from the ITO layer to the MQWs active region. Due to the increased hole concentration and drift speed, for a 300 ㎛ × 254 ㎛ UV-LED chip, the optical output power increased by 19.6% at 120 ㎃. Therefore, the proposed tunneling enhanced structure provides a simple and effective way to increase the light output power of UV-LEDs.
Jinxing Li,Dongbo Shi,Guangya Zhu,Yonghui Xie 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.10
An integrated method combining one-dimensional design and automatic threedimensional optimization is proposed for SCO 2 radial inflow turbines with low specific speed. The optimization of the nozzle and impeller are performed simultaneously. Four optimization algorithms, namely, grey wolf optimizer, elephant herding optimization, genetic algorithm, and simulated annealing algorithm, are integrated with computational fluid dynamics simulation and finite element analysis to improve the turbine efficiency. Two constraints (mass flow variation and maximum stress) are imposed in the optimization process. The results indicate that the grey wolf optimizer is the optimal algorithm. The total-to-static efficiency of the optimal turbine is 89.56 %, which is increased by 3.25 %. Moreover, splitter blades are also investigated and optimized. The maximum total-to-static efficiency of 90.16 % can be obtained by reasonably arranging splitter blades. The proposed method is versatile, nimble, and easy to implement. It can improve the design efficiency and provide a geometric reference for low specific speed SCO 2 turbines.
Jinxing Fan,Eunseop Yeom 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Printed circuit heat exchanger (PCHE) is the most promising technology in LNG-floating production storage and offloading (LNG-FPSO) because of its high thermal-hydraulic performance and structural rigidity. In this study, the heat transfer performance of PCHE with sinusoidal channels is numerically investigated. The effects of period and amplitude of the sinusoidal channel are analyzed. The increased amplitude contributes to the heat transfer while the heat transfer performance decreases with the increase of period. In this study, the velocity distribution around the channel surface varies periodically and corresponds well with the wall shear stress distribution because of the recirculating flow induced by the waviness. It has been shown that the nonuniform distribution of flow velocity conduces to the better heat transfer performance in the PCHE.
Multibody dynamics analysis of a silent chain drive timing system
Jinxing Yang,Zengming Feng,Huanhuan Gao,Tianrui Wang,Kai Xu 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.4
Multibody dynamics analysis of a silent chain drive timing system can quickly detect system defects in the product design stage and shorten the development cycle. At present, most of the research on chain drives focuses on roller chains. A 3D silent chain drive timing system model considering the fluctuation of crankshaft sprocket speed and camshaft sprocket torque was established in this paper based on recursive algorithm and Hertz contact theory. The accuracy of the model was verified by comparing the experimental and simulation results of the chain tension. The simulation results show that the chain tension fluctuation with time is obviously affected by the camshaft torque fluctuation, and the maximum chain tension ranges from 233 N to 1202 N, which is less than the safe rotation fatigue limit 1600 N. When the crankshaft sprocket speed is 6000 r/min, the maximum contact force between the chain and crankshaft sprocket and slack guide is 751 N and 588 N, respectively. The maximum chain fluctuation caused by meshing impact between chain and sprocket and polygon effect is 0.52 mm and 0.48 mm, respectively. The system transmission error ranges from 0.14° to 0.38°, which is less than 1° of the maximum allowable transmission error.