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A feasible hydrogen evolution process of water electrolysis assisted by TiO2 nanotube photocatalysis
Hongbo He,Aiping Chen,Ming Chang,Lei Ma,Chunzhong Li 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.4
A feasible process called as the hydrogen evolution of water electrolysis assisted by photocatalysis (WEAP) was proposed and experimentally achieved. In comparison with traditional alkaline electrolytic cell for water electrolysis with Ni anode, H2-production rate increased by 118% and the applied direct voltage reduced by 14.5% in WEAP with photoactive Ni anode modified by TiO2 nanotubes.
Sifting process of EMD and its application in rolling element bearing fault diagnosis
Hongbo Dong,Keyu Qi,Xuefeng Chen,Yanyang Zi,Zhengjia He,Bing Li 대한기계학회 2009 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.23 No.8
Among the vibration-based fault diagnosis methods for rolling element bearing, the shock pulse method (SPM) combined with the demodulation method is a useful quantitative technique for estimating bearing running state. However, direct demodulation often misestimates the shock value of characteristic defect frequency. To overcome this disadvantage, the vibration signal should be decomposed before demodulation. Empirical mode decomposition (EMD) can be an alternative for preprocess bearing fault signals. However, the trouble with this method’s application is that it is time-consuming. Therefore, a novel method that can improve the sifting process’s efficiency is proposed, in which only one time of cubic spline fitting is required in each sifting process. As a consequence, the time for EMD analysis can be evidently shortened and the decomposition results simultaneously maintained at a high precision. Simulations and experiments verify that the improved EMD method, combined with SPM and demodulation analysis, is efficient and accurate and can be effectively applied in engineering practice.
Influence and optimization of split‑winding on induction motor performance
Hongbo Qiu,Kun He,Ran Yi 전력전자학회 2023 JOURNAL OF POWER ELECTRONICS Vol.23 No.8
Aiming at the problems of the low output torque and low overload capacity of induction motors caused by the decrease in the main flux at high speeds, the infl uence of split-winding on motor performance is studied in this paper, and the performance of the motor is optimized by a study of the winding split turns and winding split segments. First, the influences of winding turns and frequency on motor performance parameters are analyzed by an analytical algorithm, and the mechanism of split-winding on motor performance is revealed. Second, the performance of the motor before and after winding splitting is calculated by the finite element method, and the influences of winding splitting on the output torque and overload capacity are clarified. Through the study of the winding split turns and the number of winding split segments, the best speed at the winding split and the optimum number of winding split segments are determined, which provides a basis for the winding split principle when an induction motor is designed with split-winding. Finally, the performance of a prototype before and after a winding split is tested and the accuracy of the finite element calculation is verified.
Recent advances in the use of photochromic dyes for photocontrol in biomedicine
Cheng, Hongbo,Yoon, Juyoung,Tian, He Elsevier 2018 Coordination chemistry reviews Vol.372 No.-
<P><B>Abstract</B></P> <P>Light can play important roles in controlling biochemical processes. Owing to their high spatiotemporal resolution and non-invasive nature, light can be utilized as smart triggers to mediate the biological activities of substances. In this review, we summarize important photochromic dye based photoswitchable substances that have been developed in recent years. Additionally, the basic principles involved in the design of the photochromic biomaterials, and insights into how to expand applications of these light activated agents and the key challenges that need to be considered are discussed.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The main approaches for constructing the photochromic biomaterial are reviewed. </LI> <LI> The general concept and importance of optical control of biomedicine are discussed. </LI> <LI> The opportunities and challenges for photochromic biomaterial are included. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Fubing Zou,Hongbo Tan,Yulin Guo,Baoguo Ma,Xingyang He,Yang Zhou 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.55 No.-
Sodium gluconate is a commonly used retarder, and the incorporation of SG has been accepted as the most efficient way to improve the basic performance of polycarboxylate superplasticizer (PCE) system in real concrete. However, this improvement cannot be always achieved, and the main reason for this uncertainty is because the interaction between PCE and SG has not completely understood. In order to gain deeper insight into this interaction, adsorption behavior and dispersion mechanism of PCE-SG system involved in two kinds of PCE with different grafting density of carboxyl groups in side chain have been investigated. Specifically, the dispersion was assessed with the fluidity of the cement paste, and adsorption behavior was estimated with total organic carbon and zeta potential. The combination between PCE and SG was characterized with conductivity, dynamic light scattering, and X-ray photoelectron spectroscopy. Finally, several models were proposed to illustrate the mechanism behind. The results show that gluconate grafted as side chain of PCE and the increase in length of PEO chain caused by addition of SG can provide contribution to dispersion. Competitive adsorption between SG and PCE would take place to reduce the dispersion, and the declining degree depends on the relative adsorption between PCE and SG. Dispersion of PCE-SG is not only dependent on added dosage of SG, but also decided by molecular structure of PCE. This result provides guidance on how to promote the basic performance of the PCE-retarder system in real engineering practice.
Laser-induced Damage of Multilayer Oxide Coatings at 248 nm
Chaoyang Wei,Hongbo He,Hongji Qi,Kui Yi,Zhengxiu Fan 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.58 No.42
Al_2O_3/SiO_2 and HfO_2/SiO_2 high reflection coatings for 248 nm were deposited with optimized parameters to try to elucidate the laser-induced damage mechanisms of oxide coatings for 248 nm irradiation. Qualitative differences in the laser-induced damage thresholds (LIDTs) and in the surface morphologies indicated that the dominant damage mechanisms were different for the two multilayers. The damage morphology information showed that the damage was induced by defects for the HfO_2/SiO_2 multilayers whereas the damage for Al_2O_3/SiO_2 multilayers displayed intrinsic damage characteristics that were dramatically different from those of HfO_2/SiO_2 multilayers. Quantitative analyse of the above two kinds of coatings were done. The results showed that the damage to the HfO_2/SiO_2 multilayers can be well explained by a defect model. As for the damage to the Al_2O_3/SiO_2 multilayer, a quantitative analysis based on electron production via multiphoton ionization (MPI) and impact ionization (II) was in good agreement with the assumption that the damage to the Al_2O_3/SiO_2 multilayers was induced by intrinsic nonlinear absorption.