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| 1 | Simulations and Experimental Investigation on Motion Stability of a Flexible Rotor-bearing System with a Transverse Crack显示文摘In the classical process for stability studies on the rotor-bearing system with crack faults,the simple discrete model is adopted for research on such problems,which neglect some needful dynamical influence factor,such as the material damping,shearing effect and gyroscopic effects,etc.Therefore,it is necessary to find a precise calculation model for simulation of the rotor-bearing system with cracks faults.In this paper,instead of the traditional simple discrete model,finite element(FE)model is adopted to investigate the motion stability of a nonlinear rotor system with crack fault.According to finite element theory,the FE model of the cracked rotor system is established firstly.It should be pointed out that the element where the crack occurs is modeled by a particular crack element and the supports at both ends are simulated by two nonlinear loads.Then,based on dimensionless and dimensionality reduction,the Newmark-βmethod and the shooting method are employed to study the effect of eccentricity and the depth of crack on instability speed and bifurcation feature.Furthermore,the simulation results are verified by some corresponding experiments.The simulation and experimental results show that instability speed does not change monotonically,but decreases firstly and then increases when the amount of eccentricity increases.Moreover,as the type of instability changes,the instability speed jumps concomitantly.Additionally,the presence of crack fault can disturb the oil whirl,as a result,instability speed tends to increase slightly,but it does not affect the type of instability and jumping phenomenon.This research presents an effective and convenient method which uses the finite element method(FEM)to research the motion stability of the nonlinear rotor-bearing system with cracked faults and other nonlinear force,and the proposed method can provide a theoretical reference for stability analysis and vibration control in more complex relevant rotor-bearing system. | LI Chaofeng YU Hexing ZHOU Shihua WEN Bangchun | 2013 | Chinese Journal of Mechanical Engineering2013，26，6： | 5 |
| 2 | Photoelectrocatalytic reduction of CO_2 to methanol over a photosystem Ⅱ-enhanced Cu foam/Si-nanowire system显示文摘A solar-light double illumination photoelectrocatalytic cell(SLDIPEC) was fabricated for autonomous CO_2 reduction and O_2 evolution with the aid of photosystem II(PS-II, an efficient light-driven water-oxidized enzyme from nature) and utilized in a photoanode solution. The proposed SLPEC system was composed of Cu foam as the photoanode and p-Si nanowires(Si-NW) as the photocathode. Under solar irradiation, it exhibited a super-photoelectrocatalytic performance for CO_2 conversion to methanol, with a high evolution rate(41.94 mmol/hr), owing to fast electron transfer from PS-II to Cu foam.Electrons were subsequently trapped by Si-NW through an external circuit via bias voltage(0.5 V), and a suitable conduction band potential of Si(-0.6 e V) allowed CO_2 to be easily reduced to CH_3 OH at the photocathode. The constructed Z-scheme between Cu foam and Si-NW can allow the SLDIPEC system to reduce CO_2(8.03 mmol/hr) in the absence of bias voltage. This approach makes full use of the energy band mismatch of the photoanode and photocathode to design a highly efficient device for solving environmental issues and producing clean energy. | Zichao Lian Donglai Pan Wenchao Wang Dieqing Zhang Guisheng Li Hexing Li | 2017 | Journal of Environmental Sciences2017，29，10： | 5 |
| 3 | B7-H3 Over Expression in Prostate Cancer Promotes Tumor Cell Progression显示文摘 | Hexing Yuan Xuedong Wei Guangbo Zhang Chen Li Xueguang Zhang Jianquan Hou | 2011 | The Journal of Urology2011，，3： | 2 |
| 4 | Self-powered electrochemical system by combining Fenton reaction and active chlorine geheration for organic contaminant treatment显示文摘Environmental deterioration,especially water pollution,is widely dispersed and could affect the quality of people's life at large.Though the sewage treatment plants are constructed to meet the demands of cities,distributed treatment units are still in request for the supplementary of centralized purification beyond the range of plants.Electrochemical degradation can reduce organic pollution to some degree,but it has to be powered.Triboelectric nanogenerator(TENG)is a newly-invented technology for low-frequency mechanical energy harvesting.Here,by integrating a rotary TENG(R-TENG)as electric power source with an electrochemical cell containing a modified graphite felt cathode for hydrogen peroxide(H2O2)along with hydroxyl radical(·OH)generation by Fenton reaction and a platinum sheet anode for active chlorine generation,a self-powered electrochemical system(SPECS)was constructed.Under the driven of mechanical energy or wind flow,such SPECS can efficiently degrade dyes after power management in neutral condition without any O2 aeration.This work not only provides a guideline for optimizing self-powered electrochemical reaction,but also displays a strategy based on the conversion from distributed mechanical energy to chemical energy for environmental remediation. | Yawei Feng Kai Han Tao Jiang Zhenfeng Bian Xi Liang Xia Cao Hexing Li Zhong Lin Wang | 2019 | Nano Research2019，12，11： | 2 |
| 5 | Robust H∞ filter design for uncertain nonlinear discrete systems with state delay显示文摘In this paper, we address the problem of robust H∞ filter design for a class of nonlinear discrete-time systems with norm-bounded parameter uncertainty, unknown state delay, and unknown nonlinear disturbance. Firstly, the suffident condition of the existence of the robust filter is analyzed by the modified Riceati inequalities, such that the filtering process remains robustly stable and a prescribed H∞ performance lever is achieved. Then the filter is characterized in the terms of positive solutions of two algebraic Riccati-like equations, irrespective of the uncertainties, time delays and nonlinearities. The simulation example further shows the validity and the applicability of the proposed approach. | CaiYunze HeXing XuXiaoming ZhangWeidong | 2004 | Journal of Systems Engineering and Electronics2004，15，4： | 2 |
| 6 | Staged microvascular anastomosis training program for novices:transplantation of both kidneys from one rat donor显示文摘 | Zhou Shoujun Li Enchun He Jun Weng Guobin Yuan Hexing Hou Jianquan | 2014 | Chinese Medical Journal2014，，4： | 2 |
| 7 | Mesoporous Au-TiO2 nanocomposites with enhanced photocatalytic activity显示文摘 | LI Hexing BIAN Zhengfeng ZHU Jian | 2007 | Journal of the American Chemical Society2007，129，15： | 1 |
| 8 | ACe - promoted Ni - B amorphous alloy catalyst ( Ni - Ce - B) forliquid - phase furfural hydrogenation to furfural alcohol 显示文摘 | Hexing Li Siyong Zhang Hongshan Luo | 2004 | Materials Letters2004，58，2223： | 1 |
| 9 | Silicon-oxide-assis-tedwearofadiamond-containingcomposite显示文摘 | XiaoH SinyukovA M HeX etal | 2013 | JournalofAppliedPhysics2013，114，22： | 1 |
| 10 | Crystallization deactivation of Ni-P/SiO2 amorphous catalyst and the stabilizing effect of silica support on the Ni-P amorphous structure显示文摘 | Li Hexing Wang Weijiang Li Hui | 2000 | Journal of Catalysis2000，194，： | 1 |
| 11 | 显示文摘 | Li Hexing Chen Xingfan Wang Minghui | 2002 | Applied Catalysis A2002，225，12： | 1 |
| 12 | A comprehensive mapping of HIV-1 genotypes in various risk groups and regions across China based on a nationwide molecular epidemiologic survey显示文摘 | HeX Xing H Ruan Y | 2012 | PLoS One2012，7，47： | 1 |
| 13 | Imidazolium‐Based Organic–Inorganic Hybrid Silica as a Functional Platform Dramatically Boosts Chiral Organometallics Performance in Asymmetric Catalysis显示文摘 | Daquan Xia Tanyu Cheng Wei Xiao Ketang Liu Zhaoliang Wang Guohua Liu Hexing Li Wei Wang | 2013 | ChemCatChem2013，，7： | 1 |
| 14 | The crystallization process of ultrafine Ni-B amorphous alloy 显示文摘 | Li Hui Li Hexing Deng Jingfa | 2001 | Materials Letters2001，50，： | 1 |
| 15 | Glucose hydrogenation over Ni-B/SiO2 amorphous alloy catalyst and the promoting effect of metal dopants显示文摘 | Hui Li Hexing Li Jing-Fa Deng | 2002 | Catalysis today2002，74，： | 1 |
| 16 | Liquid phase acetonitrile hydrogenation to ethylamine over a highly active and selective Ni-Co-B amorphous alloy catalyst显示文摘 | Li Hexing Wu YuedongjZhang Jing | 2004 | Applied Catalysis A:General2004，275，12： | 1 |
| 17 | Gas-phase hydrogenation of adiponitrile with high selectivity to primary anline over supposed Ni-B amorphous catalysts显示文摘 | Hexing Li Yeping Xu Hui Li | 2001 | Applied Catalysis A:General2001，216，： | 1 |
| 18 | Liquid phase glu- cose hydrogenation to D-glucitol over an uttrafine Ru-B amorphous alloy catalyst显示文摘 | Guo Haibing Li Hexing Zhu Jian | 2003 | J Mol Catal A : Chem2003，200，： | 1 |
| 19 | Liquid phase glucose hydrogenation over Cr-promoted alloy catalysts显示文摘 | HAIBING Guo HEXING LI YEPING XU | 2002 | Materials Letters2002，57，： | 1 |
| 20 | Glucose hydro- genation to sorbitol over a skeletal Ni-P amorphous alloy catalyst显示文摘 | Li Hexing Wang Weijiang Deng Jingfa | 2000 | Journal of Catalysis2000，191，： | 1 |
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