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Microstructure,mechanical properties and stress corrosion behavior of friction stir welded joint of Al-Mg-Si alloy extrusion

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Rare Metals 2023年第6期42卷 2057-2067页

作者： Sen Lin yun-Lai deng Hua-Qiang Lin Ling-Ying Ye Zhen Zhang Hua Ji Xin-Ming Zhang School of Materials Science and Engineering Central South UniversityChangsha410083China Light Alloy Research Institute Central South UniversityChangsha410083China Guangxi Liuzhou Yinhai Aluminum Co. LtdLiuzhou545006China National Engineering Research Center for High-Speed EMU CRRC Qingdao Sifang Co.LtdQingdao266000China

Microstructure,mechanical properties and stress corrosion behavior of friction stir welded(FSWed) AlMg-Si alloy were *** average grain sizes of shoulder-affected zone(SAZ),nugget zone(NZ),heat-affected zone(HAZ) and base material(BM) are 6.03,4.80,168.30 and 127.24 μm,*** thermo-mechanically affected zone(TMAZ),which is generated on the edge position between HAZ and weld nugget zone,has a narrow width of 400 μ*** ultimate tensile strength(UTS) of FSWed joint is 232.20 MPa,about 91.04% with respect to that of base material of 255.06 MPa,and the joint fracture occurs at HAZ on advancing side(AS).The FSWed joint is more susceptive to stress corrosion cracking(SCC) than base material,and the SCC susceptibility increases with the rise in *** residual UTS of FSWed joints in constant loaded tests at the load levels of90,105 and 120 MPa is 89.97%,67.50% and 54.75% of the UST of FSWed joint in air,*** increase of the load in constant loaded tests and four-point beambent tests accelerates the SCC of FSWed joints.

关键词： EBSD Slow strain rate test Stress corrosion cracking Al-Mg-Si alloy Friction stir welding

New progress in development of ferroelectric and piezoelectric nanoceramics

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Journal of Advanced Ceramics 2015年第1期4卷 1-21页

作者： Xiao-Hui WANG I-Wei CHEN Xiang-yun deng Yu-Di WANG Long-Tu LI State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Department of Materials Science and Engineering University of PennsylvaniaPhiladelphiaPA 19104-6272USA

There has been great progress in the last decade in the synthesis of nanopowders with highly controlled size and size ***,the development of an unconventional pressureless two-step sintering strategy enabling densification without grain growth provides a novel technology suitable for commercial production of nanograin *** particular interest concerning bulk dense nanograin ceramics is the manifestation of ferroelectricity,which remains a fundamental issue to be understood and *** the best powder synthesis and optimized two-step sintering,high-density barium titanate(BT)and related nanograin ceramics have been fabricated to allow for a detailed determination of the size effect on nanometer-scale ferroelectricity and piezoelectricity of fundamental and industrial *** include dense ceramics of undoped BT with an average grain size down to 5 nm,and of(1x)BiScO_(3)xPbTiO_(3)(BSPT)solid solutions with an average grain size down to 10 *** we review the fabrication methods of high-density BT and BSPT nanoceramics and the major findings of the size effect on their microstructure,phase transition and electrical *** ferroelectricity is demonstrated for the first time in 5 nm BT nanoceramics,while strong local piezoelectricity is present in 10 nm BSPT nanoceramics.

关键词： nanoceramic ferroelectric piezoelectric barium titanate size effe

宽胸气雾剂改善冠心病PCI术后心绞痛患者生活质量随机对照研究

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中国中西医结合杂志 2024年第2期44卷 138-142页

作者：林志彬邓运生徐艳如梁桂连李崇信曾庆春南方医科大学南方医院心血管内科广州510515

目的观察宽胸气雾剂对冠心病经皮冠状动脉介入术(PCI)术后心绞痛患者临床疗效及生活质量的影响。方法选取2022年12月—2023年9月在南方医院诊断为冠心病接受PCI治疗后仍有心绞痛的患者72例。将患者随机分为试验组和对照组,每组各36例。... 详细信息

目的观察宽胸气雾剂对冠心病经皮冠状动脉介入术(PCI)术后心绞痛患者临床疗效及生活质量的影响。方法选取2022年12月—2023年9月在南方医院诊断为冠心病接受PCI治疗后仍有心绞痛的患者72例。将患者随机分为试验组和对照组,每组各36例。对照组给予常规药物治疗,试验组在常规药物治疗的基础上给予宽胸气雾剂舌下喷服,每次2喷,每日3次,连续喷服1个月。比较两组患者治疗前后的生活质量量表(SF-36)、西雅图心绞痛量表(SAQ)评分以及心绞痛缓解临床疗效。结果最终试验组35例和对照组34例患者完成试验。与本组治疗前比较,两组治疗后心绞痛发作频次、心绞痛发作持续时间降低,SAQ各维度评分增高(P0.05),但试验组有升高趋势。结论宽胸气雾剂能降低冠心病PCI术后心绞痛发作次数及持续时间,并改善患者的生活质量。

关键词：宽胸气雾剂冠心病心绞痛生活质量中成药中西医结合随机对照试验

关坪亚洲象食物源基地内亚洲象活动特点及与地区水热条件变化关系研究

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林业调查规划 2024年第2期49卷 145-150页

作者：张静玲则得曹志伟杨帆邓云西双版纳国家级自然保护区管护局勐养管护所云南景洪666100 中国科学院西双版纳热带植物园云南勐腊666303 云南西双版纳森林生态系统国家野外科学观测研究站云南勐腊666303

通过对比2005—2012年间关坪亚洲象食物源基地的亚洲象活动记录和同期气象观测数据,对食物源基地中亚洲象活动规律与当地降雨、温度变化间的关系进行分析。结果显示,进入食物源基地的亚洲象数量与年份增加呈正相关关系(r_(s)=0.643),食... 详细信息

通过对比2005—2012年间关坪亚洲象食物源基地的亚洲象活动记录和同期气象观测数据,对食物源基地中亚洲象活动规律与当地降雨、温度变化间的关系进行分析。结果显示,进入食物源基地的亚洲象数量与年份增加呈正相关关系(r_(s)=0.643),食物源基地正吸引越来越多的亚洲象来此觅食;进入基地的亚洲象活动次数随年降雨量的降低而增加,主要是因为亚洲象独立个体活动次数的增加。气候变化对亚洲象活动规律有潜在影响,建议未来在当地开展更加深入的气候和森林物候监测,以更合理地解释当地亚洲象的活动规律和行为改变。

关键词：亚洲象活动气候变化 Spearman秩相关系数食物源基地

Alternative Oxidase Promotes Biofilm Formation of Candida albicans

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Current Medical Science 2018年第3期38卷 443-448页

作者： Ting-mei WANG Xiao-hui XIE Ke LI yun-hua deng Hui CHEN Department of Dermatology Tongji Hospital Tongji Medical College Huazhong University of Science and TechnologyWuhan 430030 China

This study was designed to analyze the effect of the mitochondrial respiratory pathways of Candida albicans （C. albicans） on the biofilm formation. The 2, 3-bis （2-methoxy- 4-nitro-5-sulfophenyl）-2H-tetrazolium-5-carboxanilide （XTT） reduction assay was used to measure the metabolic activities of biofilms formed by the C. albicans which were cultured in the presence of respiratory pathways inhibitors. The biofilms formed by the wide type （WT）, GOA1-deleted （GOA31）, GOAl-reconstituted （GOA32）, AOXla-deleted （AOX1） and AOX1b- deleted （AOX2） C. albicans strains were examined by the XTT reduction assay and fluorescence microscopy. The expression of adhesion-related genes BCR1, ALS1, ALS3, ECEI and HWP1 in the biofilms formed by the above five C. albicans strains was detected by real time polymerase chain reaction. It was found that the metabolic activity of biofilms formed by C. albicans was decreased in the presence of alternative oxidase inhibitor whereas it was increased in the presence of classical mitochondrial respiratory pathway complex Ⅲ or complex IV inhibitor. AOX1 strain produced scarce biofilms interspersed with few hyphal filaments. Moreover, no significant changes in the expression of BCR1 and ALS3 were observed in the AOX 1 strain, but the expression of ALS1 and ECE1 was down-regulated, and that of HWP1 was up-regulated. These results indicate that both AOX1 and AOX2 can promote the biofilm formation. However, AOX1a primarily plays a regulatory role in biofilm formation in the absence of inducers where the promoting effect is mainly achieved by promoting mycelial formation.

关键词： C. albicans biofilms alternative oxidase adhesion

Construction of a 980 nm laser-activated Pt(Ⅱ)metallacycle nanosystem for efficient and safe photo-induced bacteria sterilization

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Science China Chemistry 2023年第1期66卷 155-163页

作者： Yuling Xu Chonglu Li Jusung An Xin Ma Jingfang Yang Lishi Luo yun deng Jong Seung Kim Yao Sun Key Laboratory of Pesticides and Chemical Biology Ministry of EducationInternational Joint Research Center for Intelligent Biosensor Technology and HealthCollege of ChemistryCentral China Normal UniversityWuhan 430079China Department of Chemistry KoreaUniversitySeoul 02841Republic of Korea Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules Hubei UniversityWuhan 430062China State Key Laboratory of Chemo/Biosensing and Chemometrics Hunan UniversityChangsha 410082China Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education Jianghan UniversityWuhan 430056China

Although metal-based chemical agents have demonstrated promising bacteriostatic effects in phototherapy,their short excitation/emission wavelengths and inadequate phototherapy efficiencies make their application in vivo *** therefore synthesized a novel Pt(Ⅱ)metallacycle(Pt1110)that can be activated with a 980 nm laser for photodiagnosis/treatment in deep *** found that Pt1110 significantly improved photothermal conversion(95%improvement)and ^(1)O_(2) generation(ΦΔ75%increase)compared to the ligand itself 1 and was well capable of light-induced sterilization under safe laser irradiation(0.72 W/cm^(2)).In addition,Pt1110 has little to no toxicity to *** incorporated into liposome,Pt1110 NPs was effective in wound healing in infection and keratitis models upon laser irradiation,which was accurately observed by NIR-Ⅱfluorescence *** novel metal-coordinated supramolecular material has a potential to become a universal platform for phototherapy in deep tissue.

关键词： supramolecular chemistry metallacycle NIR-Ⅱfluorescence imaging phototheranostics deep penetration

Special issue on electrochemical energy storage and conversion

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Frontiers in Energy 2024年第2期18卷 125-127页

作者： yun ZHENG Gaixia ZHANG Sixu deng Jiujun ZHANG Institute of New Energy Materials and Engineering School of Materials Science and EngineeringFuzhou UniversityFuzhou 350108China Department of Electrical Engineering École de Technologie Supérieure(ÉTS)Universitédu QuébecMontréalH3C 1K3Canada Department of Chemical and Materials Engineering Concordia UniversityMontrealQC H3G 1M8Canada

The escalating global consumption of fossil fuels has significantly elevated the levels of CO_(2)in the atmosphere,leading to an undesirable global energy crisis and environmental *** deployment of renewable energy resources is crucial to mitigate these *** recent years,there has been noteworthy progress in electrochemical energy storage and conversion techniques and devices,including hydrogen energy and fuel cells,advanced energy storage and power batteries,and CO_(2)electrochemical conversion and utilization.

关键词： electrochemical energy elevated

A New Diterpene Glycoside from Isodon forrestii

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Chinese Chemical Letters 2001年第2期12卷 145-146页

作者： Shuang Xi MEI yun Xin deng Quan Bin HAN Zhong Wen LIN Han Dong SUN Laboratory of Phytochemistry Kunming Institute of BotanyAcademia SinicaKunming 650204 Department of Pharmacy Guiyang Medical CollegeGuiyang 550000

A new diterpene glycoside named 9(10-->20)-abeo-7 beta ,10 beta ,11,15-tetrahydroxy-8,11,13-abietatrien-12-O-beta -D-glucopyranoside was isolated from aerial parts of Isodon forrestii. Its structure was determined by ... 详细信息

关键词： Isodon forrestii, diterpene glycoside, abietanoid 9(10→20)-abeo-7β,10β,11,15-tetra-hydroxy-8,11,13-abietatrien-12-O-β-D-glucopyranoside

基于ANSYS软件的地铁屏蔽门变形量分布模拟分析

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机械工程与自动化 2024年第5期 110-112页

作者：赵瑜玮陈明明郝登运张晓中船海为高科技有限公司河南郑州450052

地铁屏蔽门是地铁系统的重要组成部分,通过有限元分析方法,对地铁屏蔽门在外部载荷下的变形分布进行了模拟分析。分析发现,在风压和乘客挤压力的影响下,立柱、门框等钢结构变形较小,而门体的钢化玻璃承受较大的风压载荷,变形量较大。进... 详细信息

地铁屏蔽门是地铁系统的重要组成部分,通过有限元分析方法,对地铁屏蔽门在外部载荷下的变形分布进行了模拟分析。分析发现,在风压和乘客挤压力的影响下,立柱、门框等钢结构变形较小,而门体的钢化玻璃承受较大的风压载荷,变形量较大。进一步对变形最大的固定门各部件进行了强度校核,确保其在设计值范围内。该研究结果为提高地铁系统的安全性和可靠性提供了重要参考和建议。

关键词：地铁屏蔽门变形量有限元分析