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Experimental Study of Molecular Fluctuation in the Living Cells

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Chinese Physics Letters 1996年第1期13卷 77-80页

作者： TANG Xiao-wei LIU jin-bo WU Bi-chu Institute of High Energy Physics Academia Sinica.Beijing 100039 Department of Physics Beijing Polytechnic UniversityBeijing 100022

The velocity non-uniformity of the particle movement in the living cells is *** the concept of molecular fluctuation in the living cells,the phenomenon of the velocity non-uniformity is explained.A quantitative relati... 详细信息

关键词： movement Molecular uniformity

Biomimetic mineralization and cytocompatibility of nanorod hydroxyapatite/graphene oxide composites

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Frontiers of Chemical Science and Engineering 2018年第4期12卷 798-805页

作者： Peizhen Duan Juan Shen Guohong Zou Xu Xia bo jin School of Materials Science and Engineering Southwest University of Science and TechnologyMianyang 621010China State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials Southwest University of Science and Technology Mianyang 621010China

Nanorod hydroxyapatite (NRHA)/graphene oxide (GO) composites with weight ratios of 0.4, 1.5, and 5 have been fabricated by a facile ultrasonic-assisted method at room temperature and atmospheric pressure. The chemical structure properties and morphology of the composites were characterized by field emission source scanning electron microscope, X-ray diffraction, transmission electron microscopy, and high-resolution transmission electron microscopy. The results indicate that the NRHA/ GO composites have an irregular surface with different degree wrinkles and are stable, and NRHA are well combined with GO. In addition, the biomimetic mineralization mechanism of hydroxyapatite on the NRHA/GO composites in simulated body fluid (SBF) is presented. The presence of a bone-like apatite layer on the composite surface indicate that the NRHA/GO composites facilitate the nucleation and growth of hydroxyapatite crystals in SBF for biomimetic mineralization. Moreover, the NRHA- 1.5/GO composite and pure GO were cultured with MC3T3-E1 cells to investigate the proliferation and adhesion of cells. In vitro cytocompatibility evaluation demonstrated that the NRHA/GO composite can act as a good template for the growth and adhesion of cells. Therefore, the NRHA/GO composite could be applied as a GO-based, free-template, non-toxic, and bioactive composite to substitute for a damaged or defect bone.

关键词： hydroxyapatite graphene oxide biomimetic mineralization cytocompatibility

Utilization of winery wastes for Trichoderma viride biocontrol agent production by solid state fermentation

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Journal of Environmental Sciences 2008年第3期20卷 353-358页

作者： BAI Zhihui jin bo LI Yuejie CHEN Jian LI Zuming School of Earth and Environmental Science University of Adelaide Adelaide SA 5005 Australia Research Centre for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China Wastewater Research Unit South Australian Water Cooperation Bolivar SA 5110 Australia Environmental Protection Bureau of Shifiazhuang City Shijiazhuang 050021 China Teacher＇s College of Beijing Union University Beijing 100011 China

Biocontrol agents are safe and environmental friendly alternatives for pesticides in agriculture application. Trichoderma viride WEBL0703 performed a high level of antagonistic activity toward a broad spectrum of phytopathogens and was determined as a biocontrol agent, which was produced by solid state fermentation using grape marc and wine lees. The maximum yield of T. viride conidia was up to 6.65 × 10^9 CFU/g initial dry substrate （IDS） after 10 d fermentation. As important enzymes for protecting plants from disease, chitinase, β-glucanase, and pectinase yields were 47.8 U/g IDS, 8.32 U/g IDS and 9.83 U/g IDS, respectively. These results show that it is feasible to convert winery wastes to a value-added and environmental friendly biocontrol agent.

关键词： grape marc wine lees biocontrol agent Trichoderrna viride solid state fermentation

A compressive tracking based on time-space Kalman fusion model

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Science China(Information Sciences) 2016年第1期59卷 120-134页

作者： Xiao YUN Zhongliang jinG Gang XIAO bo jin Canlong ZHANG School of Aeronautics and Astronautics Shanghai Jiao Tong University School of Software Engineering East China Normal University School of Computer Science and Information Technology Guangxi Normal University

The compressive tracking(CT) method is a simple yet efficient algorithm which compresses the high-dimensional features into a low-dimensional space while preserving most of the salient information. This paper proposes a compressive time-space Kalman fusion tracking algorithm to extend the CT method to the case of multi-sensor fusion tracking. Existing fusion trackers deal with multi-sensor features individually and without time-space adaptability. Besides, significant information cumulated in the updating process has not been fully exploited, which calls for a necessity for temporal information extraction. Unlike previous algorithms,the proposed fusion model is completed in both space and time domains. Also, extended Kalman filter is introduced to formulate an updating method for fusion coefficient optimization. The accuracy and robustness of the proposed fusion tracking algorithm are demonstrated by several experimental results.

关键词： fusion tracking compressive tracking time-space Kalman fusion model extended Kalman filter visual tracking

Analysis of abnormal texture formation and strengthening mechanism in an extruded Mg-Gd-Y-Zn-Zr alloy

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Journal of Materials Science & Technology 2020年第10期42卷 133-145页

作者： Xueze jin Wenchen Xu Zhongze Yang Can Yuan Debin Shan BugangTeng bo Cheng jin National Key Laboratory for Precision Hot Processing of Metals&School of Materials Science and Engineering Harbin Institute of TechnologyHarbin150001China Advanced Composites Simulation Lab University of Southern CaliforniaLos AngelesCA 90089-0241USA

A Mg-Gd-Y-Zn-Zr magnesium alloy with different initial states was extruded under different extrusion *** effect of solution treatment and extrusion parameters on the microstructure,texture and mechanical properties were analyzed in detail,and the abnormal texture formation and strengthening mechanism was *** extruded at low temperature and small extrusion ratio,the bimodal microstructure consisting of fine dynamically recrystallized grains and coarse deformed grains occurred both in the as-cast alloy and solution-treated *** the extrusion temperature and extrusion ratio were increased,the amount and size of dynamically recrystallized grains increased and the grain size of the solution-treated alloy showed higher growth ***,an abnormal texture withparallel with extrusion direction developed due to the occurrence of non-basal slip and continuous dynamic *** could be enhanced by solution treatment,high temperature,and large extrusion *** the as-cast alloy and solution-treated alloy exhibited the highest tensile strength after extrusion at 300℃with an extrusion ratio of *** refinement was the main strengthening mechanism utilized in both the as-cast alloy and the solution-treated *** hardening played an important role in the sample extruded at low temperature and small extrusion ratio,with the highest contribution of about 33 MPa after extrusion at 300℃with an extrusion ratio of *** strengthening contributed more in the sample extruded at high temperature and large extrusion ratio,but no more than 24.1 *** strengthening was another strengthening mechanism in the extruded as-cast alloy,especially at high temperature and large extrusion ratio(no more than 9 MPa).

关键词： Hot extrusion Heat treatment Abnormal texture Strengthening mechanism Quantitative analysis

Effect of SO_2 on the performance of Ag-Pd/Al_2O_3 for the selective catalytic reduction of NOx with C_2H_5OH

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Journal of Environmental Sciences 2006年第5期18卷 973-978页

作者： XIE Shu-xia YU Yun-bo WANG jin HE Hong State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China

The influence of SO2 on the performance of Ag-Pd/Al2O3 for the selective catalytic reduction （SCR） of NOx with C2H5OH was investigated experimentally. The activity test results suggest that Ag-Pd/Al2O3 shows a small activity loss in the presence of SO2 when using C2H5OH as a reductant. In situ DRIFTS spectra show that the activity loss originates from the formation of surface sulphate species on the Ag-Pd/Al2O3. The surface sulphate species formation inhibits the formation of nitrate, whereas hardly changes the partial oxidation of C2H5OH. Compared with the NOx reduction by C3H6, an obvious suppression of the surface sulphate species formation was observed by DRIFTS experiment when using C2H5OH as a reductant. This phenomenon reveals the better catalytic performance and strong SO2 tolerance of Ag-Pd/Al2O3-C2H50H system.

关键词： sulphate SCR nitrate enolic species isocyanate reaction mechanism

Using Artificial Neural Networks for Energy Regulation Based Variable-speed Electrohydraulic Drive

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Chinese Journal of Mechanical Engineering 2010年第3期23卷 327-335页

作者： XU Ming jin bo YU Yaxin SHEN Haikuo LI Wei The State Key Lab of Fluid Power Transmission and Control Zhejiang University Hangzhou 310027 China College of Mechanical Engineering and Automation Zhejiang Sci-Tech University Hangzhou 310018 China

In the energy regulation based varibable-speed electrohydraulic drive system, the supply energy and the demanded energy, which will affect the control performance greatly, are crucial. However, they are hard to be obtained via conventional methods for some reasons. This paper tries to a new route： the definitive numerical values of the supply energy and the demanded energy are not required, except for their relationship which is called energy state. A three-layer back propagation（BP） neural network was built up to act as an energy analysis unit to deduce the energy state. The neural network has three inputs： the reference displacement, the actual displacement of cylinder rod and the system flowrate supply. The output of the neural network is energy state. A Chebyshev type II filter was designed to calculate the cylinder speed for the estimation of system flowrate supply. The training and testing samples of neural network were collected by the system accurate simulation model. After off-line training, the neural network was tested by the testing data. And the testing result demonstrates that the designed neural network was successful. Then, the neural network acts as the energy analysis unit in real-time experiments of cylinder position control, where it works efficiently under square-wave and sine-wave reference displacement. The experimental results validate its feasibility and adaptability. Only a position sensor and some pressure sensors, which are cheap and have quick dynamic response, are necessary for the system control. And the neural network plays the role of identifying the energy state.

关键词： neural network energy state energy regulation device variable-speed

Neutron diffraction studies of permanent magnetic materials

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Rare Metals 2020年第1期39卷 13-21页

作者： Wen-Yun Yang Dong Liang Xiang-Dong Kong jin-bo Yang State Key Laboratory for Mesoscopic Physics School of PhysicsPeking UniversityBeijing100871China Collaborative Innovation Center of Quantum Matter Beijing100871China Beijing Key Laboratory for Magnetoeletric Materials and Devices Beijing100871China Department of Micro-nano Fabrication Technology Institute of Electrical EngineeringChinese Academy of SciencesBeijing100871China

Neutron diffraction technology as an advanced material research technique has special advantages in studying magnetic materials compared to the conventional techniques such as X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),and X-ray photoelectron spectroscopy(XPS).In this review,the applications of neutron diffraction technology on permanent magnetic materials were briefly reviewed:(1)the determination of the crystal structure and magnetic structure of the typical permanent magnet material,(2)in situ neutron diffraction study of the crystal structure evolution of the permanent magnets,and(3)phase transition in permanent magnetic materials.

关键词： Neutron diffraction Permanent magnetic materials Crystal structure Magnetic structure Structure evolution Phase transition

Effect of nitrogen on microstructure and secondary hardening of H21 die steel

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Journal of Iron and Steel Research International 2019年第5期26卷 483-489页

作者： jin-bo Gu Hua-qing Liu jing-yuan Li Yan-bin Jiang Rui-jin Chang School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Key Laboratory for Advanced Materials Processing of Ministry of Education University of Science and Technology Beijing Beijing 100083 China

The effect of nitrogen on the microstructure and secondary hardening of H21 die steel was studied by using scanning electron microscope, X-ray diffraction, transmission electron microscope and dilatometer. The results demonstrate that nitrogen can enhance the secondary hardening behavior of H21 hot-working die steel without toughness lose. Nitrogen addition increases the austenitic phase zone, decreasing austenite transformation temperature and martensite transformation temperature, thereby increasing the retained austenite stability. Retained austenite in quenched steel can dissolve a large quantity of alloy, thereby decreasing the coarsening rate of the precipitates. Trace nitrogen could intensify the refinement of pearlite by decreasing the diffusion rate of alloying element into carbides. Nitrogen increases the amounts and precipitation temperature of the undissolved V(C, N) and suppresses the growth of prior austenite before quenching. During tempering process, parts of nitrogen in V(C, N) dissolved back into the matrix, resulting in the distorting lattice of ferrite, thereby reinforcing the matrix. Meanwhile, the solid-dissolved nitrogen inhibits the growth of carbides by decreasing the diffusion rate of alloying elements.

关键词： Nitrogen Secondary hardening H21 die steel Precipitate