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Jianbing Yang,Kefeng Ni,Dongzhi Wei,Yuhong Ren 한국생물공학회 2015 Biotechnology and Bioprocess Engineering Vol.20 No.5
Ni2+-functionalized Fe3O4@polydopamine magnetic nanoparticles (Ni2+-PD-MNPs) were designed and synthesized by in situ coating of magnetic nanoparticles with polydopamine, followed by conjugation of Ni2+ to the polydopamine film. The Ni2+-PD-MNPs were used to purify His-tagged red fluorescent protein (His-RFP) via affinity interaction between Ni2+ and the His-tag. The results showed that the Ni2+-PD-MNPs had extraordinary selectivity for His-RFP purification. In addition, a Histagged transaminase (ω-transaminase BJ110) was selectively immobilized onto the Ni2+-PD-MNPs without purification, and the immobilized enzyme showed improved specific activity, as well as enhanced stability and reusability.
Jianbing Hu 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.7
Some comments are presented on the paper [N. Liu, J. Fang, W. Deng, Z.-J. Wu, and G.-Q. Ding, International Journal of Control, Automation, and Systems, vol. 16, pp. 2839–2844, 2018]. Some counterexamples show that the main achievements in the above paper are incorrect.
Jianbing Lv,Xulong Li,Zhanrong Li,Helin Fu 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.1
In the process of building subways in many cities, the technology of shield tunneling has become more widely used. In large cities, it is inevitable for the tunnels to pass through the foundations of buildings or between deep piles of bridges. Due to the many restrictions on urban space in China, the clearance between two tunnels has also become smaller. Hence, it is an urgent technical problem to resolve the mutual influence of the close construction of two tunnels using shield technology. In this study, the shield construction project of two tunnels with a small clearance of 2.6 m has been analyzed. The project is between Tongdewei Station and Shangbu Station in the northern extension section of the Guangzhou Metro Line 8. The main parameters used in the analyses are the tunnel lining deformation and the ground settlement. The construction without and with the isolation pile reinforcement have been simulated numerically. The simulation results have been compared with the on-site monitoring data. Based on the comparison, it shows that with the reinforcement, the tunnel lining deformation and the ground settlement can be reduced significantly. The effect of subway shield construction on the construction of the first subway tunnel will significantly reduce. The deformation of the shield excavation net width and the mutual influence can also be greatly reduced. The findings from this study can be used as technical foundation and reference for the construction of similar projects, i.e. shield tunnel construction with a small clearance between tunnels.
Electrolyte solution transport in electropolar nanotubes
Zhao, Jianbing,Culligan, Patricia J,Qiao, Yu,Zhou, Qulan,Li, Yibing,Tak, Moonho,Park, Taehyo,Chen, Xi IOP Pub 2010 Journal of Physics, Condensed Matter Vol.22 No.31
<P>Electrolyte transport in nanochannels plays an important role in a number of emerging areas. Using non-equilibrium molecular dynamics (NEMD) simulations, the fundamental transport behavior of an electrolyte/water solution in a confined model nanoenvironment is systematically investigated by varying the nanochannel dimension, solid phase, electrolyte phase, ion concentration and transport rate. It is found that the shear resistance encountered by the nanofluid strongly depends on these material/system parameters; furthermore, several effects are coupled. The mechanisms of the nanofluidic transport characteristics are explained by considering the unique molecular/ion structure formed inside the nanochannel. The lower shear resistance observed in some of the systems studies could be beneficial for nanoconductors, while the higher shear resistance (or higher effective viscosity) observed in other systems might enhance the performance of energy dissipation devices.</P>
Chaochen Ma,Jianbing Gao,Shikai Xing,Liwei Sun,Jiangquan Liu 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.12
Non-road diesel engines are important polycyclic aromatic hydrocarbon (PAH) sources in the environment due to their high emission concentration compared to on-road diesel engines. Particle- and gas-phase PAH concentrations of a non-road diesel engine were investigated. Non-thermal plasma (NTP) as an effective after-treatment technology was used to reduce PAH emissions. The results showed that particle-phase PAH concentrations were 329.7 μg/m3, 3,206.7 μg/m3, and 1,185.7 μg/m3 without the action of NTP at three different engine loads respectively. Relatively low concentrations were measured for gas-phase PAHs. Excellent linearity was shown for particle-phase with total PAH concentrations both with, and without, NTP. The gas-phase PAH concentrations linearly increased with engine load without NTP. The five most abundant compounds of PAHs were among low molecular weight (LMW) and medium molecular weight (MMW) compounds. Total PAH cleaning efficiency was beyond 50% when treated with NTP at the three different engine loads. We hypothesized that naphthalene (Nap) concentrations increased greatly at 60% and 80% engine loads because it was produced within the plasma zone by decomposition of high molecular weight (HMW) PAHs. The PAHs content of particulate matter (PM) aggregation at 60% load was approximately three times higher than at 40% and 80% loads. High correlation values were observed for MMW PAHs with total PAH concentrations. Correlations of PAH concentration reduction could be important to clarify the PAH reduction mechanism with NTP technology.
Yefeng Feng,Jianxiong Zhang,Jianbing Hu,Shichun Li,Cheng Peng 대한금속·재료학회 2018 ELECTRONIC MATERIALS LETTERS Vol.14 No.2
Interface induced polarization has a prominent influence on dielectric properties of 0–3 type polymer based composites containingSi-based semi-conductors. The disadvantages of composites were higher dielectric loss, lower breakdown strength andenergy storage density, although higher permittivity was achieved. In this work, dielectric, conductive, breakdown and energystorage properties of four nano-composites have been researched. Based on the cooperation of fluoropolymer/alpha-SiC layerand fluoropolymer/hexagonal-BN layer, it was confirmed constructing the heterogeneous layer-by-layer composite structurerather than homogeneous mono-layer structure could significantly reduce dielectric loss, promote breakdown strength andincrease energy storage density. The former worked for a larger dielectric response and the latter layer acted as a robust barrierof charge carrier transfer. The best nano-composite could possess a permittivity of 43@100 Hz (~ 3.3 times of polymer),loss of 0.07@100 Hz (~ 37% of polymer), discharged energy density of 2.23 J/cm3@249 kV/cm (~ 10 times of polymer)and discharged energy efficiency of 54%@249 kV/cm (~ 5 times of polymer). This work might enlighten a facile route toachieve the promising high energy storage composite dielectrics by constructing the layer-by-layer topological structure.
Kai Zheng,Dongfang Zhou,Jianbing Li,Li Li,Yujing Zhao 전력전자학회 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.3
A digital self-sustained phase shift modulation (DSSPSM) strategy that allows for good soft switching and dynamic response performance in the presence of step variations is presented in this paper. The working principle, soft switching characteristics, and voltage gain formulae of a LLC converter with DSSPSM have been provided separately. Furthermore, the method for realizing DSSPSM is proposed. Specifically, some key components of the proposed DSSPSM are carefully investigated, including a parameter variation analysis, the start-up process, and the zero-crossing capture of the resonant current. The simulation and experiment results verify the feasibility of the proposed control method. It is observed that the zero voltage switching of the switches and the zero current switching of the rectifier diodes can be easily realized in presence of step load variations.
Hang Li,Changxiang Yan,Jianbing Shao 한국광학회 2016 Current Optics and Photonics Vol.20 No.3
The performance of a staring infrared imaging system can be characterized based on estimating themodulation transfer function (MTF). The slant edge method is a widely used MTF estimation method,which can effectively solve the aliasing problem caused by the discrete undersampling of the infrared focalplane array. However, the traditional slant edge method has some limitations such as the low precisionof the edge angle extraction and using the approximate function to fit the edge spread function (ESF),which affects the accuracy of the MTF estimation. In this paper, we propose a modified slant edge method,including an edge angle extraction method that can improve the precision of the edge angle extractionand an ESF fitting algorithm which is based on the transfer function model of the imaging system, toenhance the accuracy of the MTF estimation. This modified slant edge method presents higher estimationaccuracy and better immunity to noise and edge angle than other traditional methods, which is demonstratedby the simulation and application experiments operated in our study.