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Improved wear resistance of biodegradable Mg-1.5Zn-0.6Zr alloy by Sc addition

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Rare Metals 2021年第8期40卷 2206-2212页

作者： Tao Li Xi-Tao Wang Shou-Qiu Tang Yuan-Sheng Yang Jian-hua wu Ji-Xue Zhou Shandong Provincial Key Laboratory of High Strength Lightweight Metallic Materials Advanced Materials InstituteQilu University of Technology(Shandong Academy of Sciences)Jinan250014China Institute of Metal Research Chinese Academy of SciencesShenyang110016China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing100083China Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing100083China

Magnesium alloys exhibit significant potential for use in next-generation biodegradable *** magnesium alloys are expected to exhibit good wear *** this work,the effects of rare earth metal Sc on the wear resistance of biodegradable magnesium alloys were *** average grain sizes of Mg-1.5 Zn-0.6 Zr-x Sc(ZK21-x Sc,x=0,0.2,0.5,1.0;wt%)alloys decreased with Sc content *** other rare earth metals,the grain refinement mechanism of Sc belongs to the heterogeneous nucleation *** yield tensile strengths and Vickers hardness of the ZK21-x Sc alloys markedly improved with the addition of Sc *** could be due to the grain refinement and enhanced bond energy resulting from Sc ***,the friction and wear tests showed that the friction coefficient of the alloys decreased and the weight loss reduced with Sc addition *** implies that Sc addition could enhance the wear resistance of magnesium *** the addition of Sc increasing,the peeling phenomenon weakened gradually and the worn surfaces of samples became *** major wear mechanisms of the as-cast ZK21-x Sc alloys were abrasion wear and delamination wear.

关键词： Magnesium Wear resistance Scandium Hardness Biodegradable

Undifferentiated liver embryonal sarcoma in adults: A report of four cases and literature review

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World Journal of Gastroenterology 2010年第37期16卷 4725-4732页

作者： Xiao-Wei Li Shao-Juan Gong Wei-hua Song Jun-Jun Zhu Chun-hua Pan Meng-Chao wu Ai-Min Xu Department of Inte rvention Radiotherapy Eastern Hepatobiliary Surgery HospitalSecond Military Medical UniversityShanghai 200438China

AIM: To evaluate the undifferentiated embryonal sarcoma of liver (UESL) in adults in order to improve its diagnosis and treatment. METHODS: Four primary and one recurrent cases of UESL were clinicopathologically evaluated and immunohistochemically investigated with a panel of antibodies using the EnVision+ system. Relevant literature about UESL in adults was reviewed. RESULTS: Three males and one female were enrolled in this study. Their chief complaints were abdominal pain, weight loss, or fever. Laboratory tests, imaging and pathological features of UESL in adults were similar to those in children. Immunohistochemistry showed evidence of widely divergent differentiation into mesenchymal and epithelial phenotypes. The survival time of patients who underwent complete tumor resection followed by adjuvant transcatheter arterial chemoembolization (TACE) was significantly longer than that of those who underwent surgical treatment ***: UESL in adults may undergo pluripotential differentiation and its diagnosis should be made based on its morphological and immunohistochemical features. Complete tumor resection after adjuvant TACE may improve the survival time of such patients.

关键词： Undifferentiated embryonal sarcoma Liver Pluripotential differentiation Transcatheter arterial chemoembolization Adult

Visible light catalyzed aromatization of 1,3,5-triaryl-2-pyrazolines by platinum(Ⅱ) polypyridyl complex under oxidant-free condition

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Science China Chemistry 2016年第2期59卷 175-179页

作者： Pan Ye Deng-Hui Wang Bin Chen qing-Yuan Meng Chen-Ho Tung Li-Zhu wu School of Chemistry and Chemical Engineering Shandong University Jinan 250100 China Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and chemistry Chinese Academy of Sciences Beijing 100190 China

With visible light(λ=450 nm) irradiation of a catalytic amount of platinum(Ⅱ) terpyridyl complex, 1,3,5-triaryl-2-pyrazolines can be smoothly converted to their corresponding pyrazoles and hydrogen in quantitative y... 详细信息

关键词： pyrazolines pyrazoles photoredox catalysis visible light platinum(Ⅱ) terpyridyl complex

Analysis of risk factors for retinopathy of prematurity

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International Journal of Ophthalmology(English edition) 2011年第6期4卷 631-633页

作者： Wen-Lin Li Li He Xi-hua Liu Yu-Mei Wang and Jian-qing Liu Department of Ophthalmology Shenzhen Children's Hospital Shenzhen 518026 Guangdong Province China

AIM: To analyze the incidence and risk factors for retinopathy of prematurity (ROP). METHODS: A retrospective analysis was conducted on 568 premature infants from September 2005 to December 2010 with birth weight (BW) equal to or less than 2 500g or a gestational age (GA) at birth of 34 weeks or less. All of the members were examined by indirect binocular ophthalmoscopy. RESULTS: ROP occurred with an incidence rate of 10.7% among 568 premature infants, and stages 3 and above ROP occurred with an incidence rate of 2.5%. This study showed the infants were more prone to develop ROP with short geststional age, low BW, long time of oxygen inhalation, and severe infants diseases. Twins had a significantly higher rate of ROP (18.3%) than singleton babies (9.8%), ROP were severer in twins than singleton babies. CONCLUSION: Short GA, low BW, long time of oxygen inhalation, severe infants diseases, and non-singleton babies were the most significant risk factors associated with ROP.

关键词： retinopathy of prematurity ROP epidemiology ROP incidence

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B型LNG燃料舱支座结构的强度分析

舰船科学技术 2024年第6期46卷 68-72页

作者：高明星郑文青张玉奎郑艺吴仁豪王维昊中国船舶及海洋工程设计研究院上海200011 上海交通大学上海200240

B型LNG燃料舱支座结构的受力机理较为复杂,其强度分析在设计中应给予重视。提出一套针对B型燃料舱支座结构强度分析的标准流程,能综合考虑层压木压力和摩擦力对支座结构强度的影响。给出一种B型燃料舱支座系统的设计方案,以典型的垂向... 详细信息

B型LNG燃料舱支座结构的受力机理较为复杂,其强度分析在设计中应给予重视。提出一套针对B型燃料舱支座结构强度分析的标准流程,能综合考虑层压木压力和摩擦力对支座结构强度的影响。给出一种B型燃料舱支座系统的设计方案,以典型的垂向支座和止横摇支座为例,应用子模型技术对其结构强度进行分析。支座结构的强度分析方法和应力分布特性可为实际工程中B型燃料舱支座的设计与分析提供参考。

关键词： LNG燃料舱 B型独立舱支座结构强度

Characterization of CeO_(2)microspheres fabricated by an ultrasonic spray pyrolysis method

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Rare Metals 2021年第1期40卷 31-39页

作者： Shou-Feng Xue Yi-Juan Li Feng-hua Zheng Xue Bian Wen-Yuan wu Cheng-Hao Yang Guangzhou Key Laboratory for Surface Chemistry of Energy Materials New Energy Research InstituteSchool of Environment and EnergySouth China University of TechnologyGuangzhou 510006China Institute of Metallurgy Northeastern UniversityShenyang 110000China

CeO_(2) is one of the main catalysts for solid oxide fuel cell(SOFC).It is critical to find a green and costeffective fabrication method for CeO_(2) at *** this study,the CeO_(2) microspheres were prepared by one-step ultrasonic spray pyrolysis of cerium chloride solution at700℃.Scanning electron microscopy(SEM)and transmission electron microscopy(TEM)study demonstrate that the prepared CeO_(2) microspheres exhibit a particle size of0.01-1.08μm with a mean particle size of 0.23μm,and more than 94%of the particles have a diameter less than0.5μ*** the presence of residual Cl in the fabricated CeO_(2) microspheres blocks the active sites and leads to the significant degradation of SOFC *** formation mechanism and distribution of residual Cl in the fabricated CeO_(2) microspheres were systemic ally *** water washing method was shown to effectively reduce the residual Cl in the CeO_(2) ***,this work provides a clean manufacturing process for the preparation of SOFC electrode/electrolyte materials.

关键词： CeO_(2) Residual chlorine Ultrasonic spray pyrolysis

Synthetic Two-dimensional Organic Structures

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Chinese Journal of Polymer Science 2018年第4期36卷 425-425,426-444页

作者： Hui Liu Xiao-Nan Kan Chen-Yu wu qing-Yan Pan Zhi-Bo Li Ying-Jie Zhao qingdao University of Science and Technology Qingdao 266042China Centre for Advanced Macromolecular Design School of Chemical EngineeringThe University of New South WalesSydneyNSW2052Australia

Synthetic two-dimensional（2 D） polymers have totally different topology structures compared with traditional linear or branched polymers. The peculiar 2 D structures bring superior properties. Although, from linear to 2 D polymers, the study of these new materials is still in its infancy, they already show potential applications especially in optoelectronics, membranes, energy storage and catalysis, etc. In this review, we summarize the recent progress of the 2 D materials from three respects：（1） Chemistry—different types of polymerization reactions or supramolecular assembly to construct the 2 D networks were described;（2） Preparation methods—surface science, crystal engineering approaches and solution synthesis were introduced;（3） Functionalization and some early applications.

关键词： Two-dimensional structures Interracial synthesis 2D crystal Covalent organic frameworks (COFs) Supramolecular assembly

Hyperbranched magnetic polymer:highly efficient removal of Cr(Ⅵ)and application in electroplating wastewater

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Frontiers of Chemical Science and Engineering 2023年第10期17卷 1568-1580页

作者： Nan Sun qing wu Lifang Jin Zichen Zhu Jianhui Sun Shuying Dong Haijiao Xie Chunyan Zhang Yanrui Cui Key Laboratory for Yellow River and huai River Water Environmental and Pollution Control Ministry of Educationand Henan Key Laboratory for Environmental Pollution ControlSchool of EnvironmentHenan Normal UniversityXinxiang 453007China

By using a two-step hydrothermal method and trithiocyanuric acid(TTCA),2,4,6-trihydrazino-1,3,5-triazine(THT),and Fe_(3)O_(4)as raw materials,a spherical magnetic adsorbent polymer(TTCA/THT@Fe_(3)O_(4))was synthesized to achieve the efficient removal of Cr(VI)from *** optimal adsorption conditions,the maximum adsorption capacity of TTCA/THT@Fe_(3)O_(4)for Cr(VI)can reach 1340 mg∙g‒***,the removal efficiency can approach 98.9%,even at the lower concentration of 20 mg∙L^(‒1)Cr(VI).For actual wastewater containing Cr(VI),the Cr(VI)concentration was reduced from 25.8 to 0.4 mg∙L^(‒1),a remarkable 20%lower than the current industry discharge standard value.A mechanism for the high adsorption performance of Cr(VI)on TTCA/THT@Fe_(3)O_(4)was investigated using Fourier transform infrared spectroscopy,X-ray photoelectron spectroscopy,and density functional *** can be plausibly attributed to the formation of Cr/N and Cr/S coordination ***,surface electrostatic adsorption,reduction effects,and the spherical polymer structure increase the contact area with Cr(VI),maximizing *** synergistic effect of adsorption and reduction enhances the adsorption performance of TTCA/THT@Fe_(3)O_(4)for Cr(VI)and total chromium in *** resultant polymer has a simple preparation process,excellent adsorption performance,easy magnetic separation,and promising application for actual wastewater.

关键词： magnetic polymer chromium removal hydrogen bonding recyclability actual wastewater

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弯扭耦合长柔叶片颤振速度分析

太阳能学报 2024年第3期45卷 90-94页

作者：罗涛巫发明黄剑锋钟杰华旭刚中车株洲电力机车研究所有限公司株洲412001 湖南大学土木工程学院长沙410082

针对弯扭耦合叶片的颤振速度进行研究,提出基于FAST_v8结合非线性几何精确梁理论评估叶片颤振速度的分析方法,基于典型截面失稳机理验证该分析方法的准确性。以某80.74 m叶片为研究对象,分析空气密度、叶片重心弦向位置、扭转频率、挥... 详细信息

针对弯扭耦合叶片的颤振速度进行研究,提出基于FAST_v8结合非线性几何精确梁理论评估叶片颤振速度的分析方法,基于典型截面失稳机理验证该分析方法的准确性。以某80.74 m叶片为研究对象,分析空气密度、叶片重心弦向位置、扭转频率、挥舞频率等参数变化对颤振速度的影响。结果表明,该80.47 m叶片颤振速度随空气密度增大而减小;质心前移可有效抑制经典颤振;提高扭转频率可提升叶片的稳定性;挥舞频率位于0.2~0.4 Hz之间时较合适。

关键词：风电机组颤振速度经典颤振弯扭耦合叶片