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Electrochemical reduction of graphene oxide films:Preparation,characterization and their electrochemical properties

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Chinese Science Bulletin 2012年第23期57卷 3045-3050页

作者： zhang xiong zhang DaCheng CHEN yao SUN XianZhong MA YanWei Institute of Electrical Engineering Chinese Academy of Sciences Beijing 100190 China

Graphene oxide (GO) film was electrochemically reduced by a cyclic voltammetry technique in 6 mol L-1 KOH aqueous *** reduced graphene oxide (ER-GO) film was characterized by X-ray diffraction,X-ray photoelectron spectroscopy,atomic force microscopy,and Raman *** oxygen content (with the O/C atomic ratio of 1.29%) was significantly decreased after electrochemical *** ER-GO film exhibited a specific capacitance of 152 F g-1 at the current density of 5 A g-1 and a good rate ***,the ER-GO film showed an excellent cycling *** capacitance retention remained 99% after 3000 cycles at the current density of 10 A g-1.

关键词： graphene, electrochemical reduction, electrochemical double-layer capacitor, electrode material

Structural Origins for Enhanced Thermal Stability and Glass‑Forming Ability of Co–B Metallic Glasses with Y and Nb Addition

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Acta Metallurgica Sinica(English Letters) 2023年第6期36卷 962-972页

作者： Shuang Ma Junyu zhang Xudong Wang Rie Y.Umetsu Li Jiang Wei zhang man yao Key Laboratory of Materials Modification by Laser Ionand Electron Beams(Ministry of Education)School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China Institute for Materials Research Tohoku UniversitySendai 980‑8577Japan

The effects of Y and Nb addition on thermal stability,glass-forming ability(GFA),and magnetic softness of Co75B25 metallic glass(MG)were comprehensively *** experimental results indicated that the thermal stability,GF... 详细信息

关键词： Co-based metallic glasses Thermal stability Glass-forming ability Soft magnetic property Ab initio molecular dynamics simulations Local atomic structure

Restart-up Performance of a CFB Boiler after a Sudden Power Failure Accident

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Journal of Thermal Science 2022年第3期31卷 830-839页

作者： yao Yuge JIANG Ling XIAO Huiren DENG Boyu zhang man zhang Yang YANG Hairui LYU Junfu Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Energy and Power EngineeringTsinghua UniversityBeijing100084China

Due to the massive bed materials in its typical main loop,a circulating fluidized bed(CFB)boiler may face greater trouble in operation and restart-up if an unplanned sudden power failure happens in the power *** study aims to explore the restart-up performance of a 170 t/h natural circulation CFB boiler after a sudden power failure and evaluate whether the hot restart-up can be *** heat transfer process after the restoration of the primary air is *** the isothermal property of the bed after the restoration of the power and air supply,the correlation among the accident duration time,bed temperature after the power restores,inlet air temperature,air supply time,and air velocity is *** predicted results indicate that the major influencing factor of the bed temperature during this process is primary air *** provide guidelines for judgment on whether the hot restart-up can be realized,the maximum values of the air supply time and accident duration time for hot restart-up for different types of coals are *** results show both of them have a rapid decrease as the coal ignition temperature in a CFB boiler increases from 450°C to 650°C,which also means that the coal ignition temperature plays a very important role in the restart-up *** on the simulation results of bed temperature during the accident,it is also estimated that the drum level drops by 77.7 mm after 8 hours but still stays in the permissible range.

关键词： CFB boiler sudden power failure restart-up drum level bed temperature

Synthesis and Characterization of Novel-4-Methyl-3-isoxazolidinone Derivatives

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Chemical Research in Chinese Universities 2006年第6期22卷 717-720页

作者： GAO Fei-fei zhang Guang-liang ZHENG liang-yu LI yao-xian zhang Suo-qin College of Chemistry Ministry of Education Jilin University Changchun 130021 P. R. China Key Lab for Molecular Enzymology and Engineering Ministry of Education Jilin University Changchun 130021 P. R. China

A novel type of aeetohydrexyacid synthase inhibitors, 4-methyl-3-isoxazolidinone derivatives of sulfonylurea, was designed and synthesized. The structures of these compounds were confirmed by using MS, NMR, and elemen... 详细信息

关键词： 4-Methyl-3-isoxazolidinone Sulfonylureas Acetohydroxyacid synthase Herbicidal activity

Optimization of Oscillation Model for Slab Continuous Casting Mould Based on Mould Friction Measurements in Plant Trial

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Journal of Iron and Steel Research International 2013年第1期20卷 13-20页

作者： WANG Xu-dong yao man zhang Li zhang Xiao-bing CHEN Shao-hui School of Material Science and Engineering Dalian University of Technology Research Institute Baoshan Iron and Steel Co Ltd Jiangsu Sha-steel Group

Lubrication and friction between the mould and strand are strongly influenced by mould oscillation, and play an important role in slab quality and operating safety during continuous casting processes. Investigation of mould oscillation is therefore essential for getting a better online control of the mould processes. A feasible approach for the development and optimization of mould oscillation was put forward, which combined online measurement of mould friction, design of negative oscillating parameters and evaluation for powder consumption. Three different control models including sinusoidal and non-sinusoidal oscillation for mould oscillations were developed to investigate and evaluate the effects of oscillation on mould friction and powder lubrication. For the purpose of investigating mould friction between mould and strand, online measurement was carried out on a slab continuous caster equipped with a hydraulic oscillator. Also the comparison of the mould friction in sinusoidal and non-sinusoidal mould oscillation was made for subsequent analysis. The industrial experiment result shows that the combination of inverse control model and non-sinusoidal oscillation mode will contribute to the proper powder consumption, leading to a suitable effect of friction force on strand surface, especially for high speed continuous casting. The proposed method provides reliable basis for guiding and optimizing mould oscillation among control models, sinusoidal oscillation and non-sinusoidal oscillation.

关键词： continuous casting mould friction oscillation mode non-sinusoidal powder consumption

不同加工方式对体外模拟胃肠消化香菇活性物质含量及活性的影响

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食品科学 2025年第2期46卷 183-192页

作者：姚芬刘红霞范秀芝史德芳殷朝敏高虹张玉姚望湖北省农业科学院农产品加工与核农技术研究所湖北武汉430064 湖北工业大学生命科学与健康工程学院湖北武汉430068 武汉市储备粮保障中心湖北武汉430021

为研究不同加工方式和处理时间对香菇体外模拟胃肠消化后活性物质含量及体外活性的影响,采用蒸制、煮制、空气炸和烤箱烤制4种方式处理香菇,通过模拟体外胃肠消化后测定消化液中总酚、总黄酮、粗多糖和香菇嘌呤含量及其体外抗氧化、降... 详细信息

为研究不同加工方式和处理时间对香菇体外模拟胃肠消化后活性物质含量及体外活性的影响,采用蒸制、煮制、空气炸和烤箱烤制4种方式处理香菇,通过模拟体外胃肠消化后测定消化液中总酚、总黄酮、粗多糖和香菇嘌呤含量及其体外抗氧化、降血脂和降血糖活性,并对消化液的体外活性和活性物质含量相关性进行分析。结果表明,消化前,与蒸制、煮制和空气炸处理相比,烤箱烤制更利于香菇中4种活性物质的保留,其中烤制5 min时总酚、总黄酮和粗多糖的含量和烤制15 min时香菇嘌呤的含量相对较高,分别为(222.13±3.57)mg/g、(4.49±0.06)mg/g、(5.57±0.28)g/100 g和(551.31±3.76)mg/100 g。经体外胃肠消化后,烤箱烤制香菇活性物质释放量相对较高,其次为空气炸。除烤箱烤制香菇总黄酮的释放量随烤制时间延长而降低外,其余活性物质释放量与加工时长无明显相关性。蒸制处理后香菇肠消化液的体外活性相对较高,其中,蒸制20 min的香菇肠消化液1,1-二苯基-2-三硝基苯肼自由基清除率和蒸制10 min的2,2′-联氮-双(3-乙基苯并噻唑啉-6-磺酸)(2,2’-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid),ABTS)阳离子自由基清除率最高(P0.05);蒸制10 min时肠消化液的胰脂肪酶抑制活性相对较强(P>0.05),为(49.42±2.32)%。相关性分析发现,胃消化液的α-葡萄糖苷酶抑制活性与其总酚(P<0.01)和香菇嘌呤(P<0.05)含量呈显著正相关,ABTS阳离子自由基抑制率与其总酚(P<0.05)和粗多糖(P<0.01)含量呈显著正相关;而肠消化液的胰脂肪酶抑制活性与4种活性物质含量均呈极显著负相关(P<0.01)。综上可以看出烤制更有利于活性物质的保留和消化释放,而蒸制更利于改善香菇肠消化液的体外活性。本研究为香菇科学合理的加工提供了指导。

关键词：香菇加工方式总酚总黄酮粗多糖香菇嘌呤体外活性

Prediction model of surface integrity characteristics in ball end milling TC17 titanium alloy

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Advances in manufacturing 2023年第3期11卷 541-565页

作者： Xue-hong Shen Chang-Feng yao liang Tan Ding-Hua zhang Key Laboratory of High Performance manufacturing for Aero Engine Ministry of Industry and Information TechnologySchool of Mechanical EngineeringNorthwestern Polytechnical UniversityXi'an 710072People's Republic of China Engineering Research Center of Advanced manufacturing Technology for Aero Engine Ministry of EducationSchool of Mechanical EngineeringNorthwestern Polytechnical UniversityXi'an 710072People's Republic of China

Surface integrity is important to improve the fatigue property of *** selection of the cutting parameters is extremely important in ensuring high surface *** this paper,ball end milling of TC17 alloy has been carried out utilizing response surface *** effects of cutting speed,feed per tooth,cutting depth,and cutting width on the surface integrity characteristics,including surface roughness(R_(a)),surface topography,residual stress,and microstructure were ***,predictive metamodels for surface roughness,residual stress,and microhardness as a function of milling parameters were *** to the experimental results obtained,the surface roughness increases with the increase of milling parameters,the(R_(a))values vary from 0.4μm to 1.2μm along the feed direction,which are much lower compared to that along the pick feed *** surface compressive residual stress increases with the increase of feed per tooth,cutting depth,and cutting width,while that decreases at high cutting *** depth of the compressive residual stress layer is mostly in the range of 25-40μ*** milled surface microhardness represents 6.4% compared with the initial state;the work-hardened layer depth is approximately 20μ***,plastic deformation and strain streamlines are observed within 3μm depth beneath the *** empirical model of surface integrity characteristics is developed using the results of ten experiments and validated by two extra *** prediction errors of the three surface integrity characteristics are within 27%;the empirical model of microhardness has the lowest prediction errors.

关键词： Prediction model Surface roughness(R_(a)) Residual stress Microhardness Microstructure

Characterization of suspended solids and particle-bound heavy metals in a first flush of highway runoff

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第11期9卷 1567-1575页

作者： Fa-hui NIE Tian LI Hai-feng yao man FENG Guang-kai zhang State Key Laboratory of Pollution Control and Resource Reuse Tongji University Shanghai 200092 China Institute of Environment Engineering Research East China Jiaotong University Nanchang 330013 China

To investigate the dynamic characteristics of total suspended solids (TSS) and their particle-bound heavy metals in a first flush, the runoff sampling together with its flow rate measuring was conducted for three rainfall events at outfalls of highway in Shanghai from June to September 2007. Field samples were analyzed to determine the concentrations of TSS and particle-bound heavy metals, such as Zn, Pb, and Cu. Results show that the wash off behavior of TSS under varying runoff rate condition can be explained by different antecedent dry weather period (ADWP). Contribution of fine fraction (45 μm). When the runoff flow increased obviously, a significant contribution of the coarse fraction was observed for a certain rainfall events with long antecedent dry weather condition. The changes of total metals concentration and particle-bound metal concentrations were strongly dependent on the TSS variation. TSS was generally well correlated with most particulate-bound heavy metals. Of the heavy metals, the concentration of Zn was found considerably high and that of Pb was significantly low at North Zhongshan 2 Road, in Shanghai, China, but they are still within the range reported in the literature. Fluctuation of heavy metal contents in the coarse fraction during a first flush period was more significant compared with that in the fine fraction. The results will assist in the development of effective control strategies to minimize heavy metals and solids in highway runoff.

关键词： Heavy metals Highway runoff First flush Suspended solids (SS)

Experimental study on surface integrity refactoring changes of Ti-17 under milling-ultrasonic rolling composite process

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Advances in manufacturing 2023年第3期11卷 492-508页

作者： Zheng Zhou Chang-Feng yao liang Tan Ya zhang Yi Fan Key Laboratory of High Performance manufacturing for Aero Engine Ministry of Industry and Information TechnologySchool of Mechanical EngineeringNorthwestern Polytechnical UniversityXi'an 710072People's Republic of China Engineering Research Center of Advanced manufacturing Technology for Aero Engine Ministry of EducationSchool of Mechanical EngineeringNorthwestern Polytechnical UniversityXi'an 710072People's Republic of China

Ultrasonic rolling is an advanced non-cutting surface strengthening method that combines traditional rolling with ultrasonic *** this research,the experiment of orthogonal end milling-ultrasonic rolling composite process has been carried *** surface integrity refactoring changes and its mechanism of Ti-17 titanium alloy during the milling-ultrasonic rolling composite process has been studied and analyzed by the test and analysis of the surface geometric characteristics,residual stress,microhardness and microstructure before and after ultrasonic *** residual stress and microhardness gradient distribution were characterized by cosine decay function and exponential decay *** indicators of surface integrity were significantly improved after ultrasonic *** study demonstrates that the reduction effect of the surface roughness by ultrasonic rolling process is inversely proportional to the initial surface roughness *** ultrasonic rolling can only change the distribution form of the surface topography when the initial surface roughness is *** addition,the improvement effect of ultrasonic rolling on surface compressive residual stress and microhardness decreased with the increase of initial milled surface roughness and surface compressive residual stress due to the factors such as energy absorption efficiency and mechanical properties changes of surface materials.A better ultrasonic rolled surface can be obtained by controlling the roughness and residual compressive stress of the initial milling surface to a small level.

关键词： Ti-17 End milling Ultrasonic rolling Surface integrity Refactoring changes