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Effects of intermittent loading time and stress ratio on dwell fatigue behavior of titanium alloy Ti-6Al-4V ELI used in deep-sea submersibles

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Journal of Materials Science & Technology 2021年第18期77卷 223-236页

作者： Chengqi Sun Yanqing Li Kuilong xu baotong xu State Key Laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of SciencesBeijing100190China School of Engineering Sciences University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Deep-sea Manned Vehicles(China Ship Scientific Research Center) Wuxi 214082China LuoyangShip Material Research Institute Luoyang471023China Aero Engine Corporation of China Beijing Institute of Aeronautical Materials Beijing 100095China

Different components of deep-sea submersibles,such as the pressure hull,are usually subjected to intermittent loading,dwell loading,and unloading during ***,for the design and reliability assessment of structural parts under dwell fatigue loading,understanding the effects of intermittent loading time on dwell fatigue behavior of the alloys is *** this study,the effects of the intermittent loading time and stress ratio on dwell fatigue behavior of the titanium alloy Ti-6 Al-4 V ELI were *** suggest that the dwell fatigue failure modes of Ti-6 Al-4 V ELI can be classified into three types,i.e.,fatigue failure mode,ductile failure mode,and mixed failure *** intermittent loading time does not affect the dwell fatigue behavior,whereas the stress ratio significantly affects the dwell fatigue life and dwell fatigue *** dwell fatigue life increases with an increase in the stress ratio for the same maximum stress,and specimens with a negative stress ratio tend to undergo ductile *** mechanism of dwell fatigue of titanium alloys is attribute to an increase in the plastic strain caused by the part of the dwell loading,thereby resulting in an increase in the actual stress of the specimens during the subsequent loading cycles and aiding the growth of the formed crack or damage,along with the local plastic strain or damage induced by the part of the fatigue load promoting the cumulative plastic strain during the dwell fatigue *** interaction between dwell loading and fatigue loading accelerates specimen failure,in contrast to the case for individual creep or fatigue loading *** dwell fatigue life and cumulative maximum strain during the first loading cycle could be correlated by a linear relationship on the log–log *** relationship can be used to evaluate the dwell fatigue life of Ti alloys with the maximum stress dwell.

关键词： Ti-6Al-4V ELI Dwell fatigue Intermittent loading time Stress ratio Creep fatigue interaction

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Recent advances in visible-light-driven conversion of CO_(2)by photocatalysts into fuels or value-added chemicals

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Carbon Resources Conversion 2020年第1期3卷 46-59页

作者： Yu Gao Kun Qian baotong xu Zheng Li Jiaxin Zheng Shan Zhao Fu Ding Yaguang Sun Zhenhe xu The Key Laboratory of Inorganic Molecule-Based Chemistry of Liaoning Province College of Applied ChemistryShenyang University of Chemical TechnologyShenyang 110142China

The photocatalytic conversion of CO_(2)into sustainable,green fuels and value-added chemicals is believed to be an appealing method to overcome both the energy crisis and environmental *** efforts have been dedicated to enhance the CO_(2)conversion efficiency and selectivity through developing photocatalysts and CO_(2)reduction systems in recent *** review gives an overview of the latest progress in photocatalysts for visible-light photocatalytic CO_(2)conversion and recent research advances of heterogeneous photocatalytic CO_(2)conversion ***,The roles of cocatalyst and heterojunctions to increase the efficiency of charge transfer,separation and visible light excitation are ***,the challenges and perspectives for visible-light-driven photocatalytic conversion of CO_(2)are proposed.

关键词： Photocatalysis CO_(2) Fuels Visible light

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深部煤层采动底板破坏带发育规律研究

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煤 2024年第8期33卷 25-29页

作者：黄亚坤李启兴张义安夏向学张庆任正瑞康佳吴威徐保同华北科技学院河北省矿井灾害防治重点实验室河北廊坊065201 国能亿利能源有限责任公司黄玉川煤矿内蒙古鄂尔多斯017000 鄂尔多斯市国源矿业开发有限责任公司内蒙古鄂尔多斯017000

煤矿深部煤层底板水害事故频发,严重影响工作面生产安全。以开滦某矿为例,利用理论计算、FLAC3D数值模拟和现场实测等多手段测试方法,研究深部煤层采动底板破坏带发育规律。采用理论计算方法分析了工作面底板破坏带的形成过程,并计算底... 详细信息

煤矿深部煤层底板水害事故频发,严重影响工作面生产安全。以开滦某矿为例,利用理论计算、FLAC3D数值模拟和现场实测等多手段测试方法,研究深部煤层采动底板破坏带发育规律。采用理论计算方法分析了工作面底板破坏带的形成过程,并计算底板破坏带最大深度为35.47 m.数值模拟结果表明,工作面底板塑性区随工作面推进而扩大发育范围,最大深度35.26 m.采用井下俯斜钻孔注水实验实测了底板破坏带发育深度为33.45 m.三种方法得到的底板破坏带深度数据均可靠,为矿井深部煤层的安全开采提供技术支撑。

关键词：深部带压开采 FLAC3D 数值模拟底板破坏带

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相干干扰下的一种稳健波束形成算法

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哈尔滨工程大学学报 2013年第8期34卷 1012-1016页

作者：沈锋李平敏许保同徐定杰哈尔滨工程大学自动化学院黑龙江哈尔滨150001

针对相干干扰环境下的常规Capon波束形成容易受期望信号导向矢量和其他阵列响应失配影响,提出了一种基于空间平滑的的最差性能最优稳健波束形成算法.该方法以均匀线阵为基础,采用空间平滑技术对相干的阵列接受信号进行预处理,再采用改... 详细信息

针对相干干扰环境下的常规Capon波束形成容易受期望信号导向矢量和其他阵列响应失配影响,提出了一种基于空间平滑的的最差性能最优稳健波束形成算法.该方法以均匀线阵为基础,采用空间平滑技术对相干的阵列接受信号进行预处理,再采用改进的稳健波束形成算法处理各种失配,有效地解决波束形成器的性能急剧下降的问题,使输出信干噪比得到很大的提高,同时减小了主峰偏移,且具有较低的旁瓣电平.最后仿真分析验证了所提算法的正确性和有效性,通过对各种各样失配进行相应的约束,使得稳健性得到进一步的提高.

关键词：空间平滑最差性能最优导向矢量失配稳健波束相干信号

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ZnIn_(2)S_(4)/g-C_(3)N_(4)复合材料的制备及可见光催化制氢性能

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高等学校化学学报 2021年第10期42卷 3160-3166页

作者：孙亚光张含烟明涛徐宝彤高雨丁茯徐振和沈阳化工大学无机分子基辽宁省重点实验室沈阳110142

采用水热方法制备了ZnIn_(2)S_(4)/g-C_(3)N_(4)复合材料,并通过X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)、紫外-可见漫反射光谱(UV-Vis DRS)、透射电子显微镜(TEM)和荧光光谱(PL)等手段对其结构和性能进行表征.结果表明,当ZnIn_(2)S_... 详细信息

采用水热方法制备了ZnIn_(2)S_(4)/g-C_(3)N_(4)复合材料,并通过X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)、紫外-可见漫反射光谱(UV-Vis DRS)、透射电子显微镜(TEM)和荧光光谱(PL)等手段对其结构和性能进行表征.结果表明,当ZnIn_(2)S_(4)的负载量为20%(质量分数)时,复合材料表现出最佳的光催化制氢性能,制氢速率可达到637.08μmol·g^(−1)·h^(−1),分别为纯ZnIn_(2)S_(4)和纯g-C_(3)N_(4)的4倍和37倍.其原因在于ZnIn_(2)S_(4)和g-C_(3)N_(4)之间具有紧密的异质结结构,两者有效的结合改善了组分的能带匹配和界面电荷转移,从而大幅增强了载流子的分离和迁移,进而提高光催化的性能.

关键词：光催化制氢石墨相氮化碳硫代铟酸锌

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Riverine sulfate sources and behaviors in arid environment,Northwest China:Constraints from sulfur and oxygen isotopes

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Journal of Environmental Sciences 2024年第3期137卷 716-731页

作者： Yifu xu Wenjing Liu Bing xu Zhifang xu Key Laboratory of Cenozoic Geology and Environment Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Innovation Academy for Earth Science Chinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100049China

The fate of riverine sulfate ion (SO_(4)^(2-)) and its environmental effects in arid environment are difficult to evaluate due to its complicated sources and strongly coupled behaviors with water cycle which is significantly modified by *** understand the sulfur cycle in aquatic systems in arid environment,the chemical and sulfur and oxygen isotopic compositions (δ^(34)S_(SO4)and δ^(18)O_(SO4)) of major rivers around the Badain Jaran Desert,northwestern China,were *** rivers had averaged SO_(4)^(2-)content at 1336μmol/L,over 10times higher than the global *** δ^(34)S_(SO4)and δ^(18)O_(SO4)values ranged from-5.3‰to+11.8‰and+1.6‰to+12.8‰,*** end-member analysis and the inverse model showed that riverine sulfate was mainly derived from evaporites dissolution (0-87%),sulfide oxidation (13%-100%) and precipitation (0-33%),indicating heterogeneity in sulfur sources and behaviors along the river drainage with the lithology variations and climate *** isotopic tools combining with hydro-chemistry compositions could be applied to reveal sulfur cycle in arid *** on the calculation,sulfide oxidation plays the primary role in the headwater and upstream in the Qilian-Mountains area,where sulfide is widely *** the proportion of evaporites dissolution contributing to riverine sulfate is much higher in downstream in a drier ***,less precipitation and higher temperature can lead to more intensive evaporation,affecting the process of sulfide oxidation and enhancing the rates of evaporites dissolution and sulfate precipitation in the basin.

关键词： Sulfur and oxygen isotopes Source apportionment Inverse model Arid environment Inland rivers Northwestern China

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In_(2)O_(3)/Ag:ZnIn_(2)S_(4)“TypeⅡ”型异质结构材料的制备及可见光催化性能

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化工学报 2022年第8期73卷 3625-3635页

作者：徐振和李泓江高雨礼峥张含烟徐宝彤丁茯孙亚光大连大学环境与化学工程学院辽宁大连116622 沈阳化工大学辽宁省无机分子基化学重点实验室辽宁沈阳110142

采用低温油浴的方法,制备出具有“TypeⅡ”异质结构的In_(2)O_(3)/Ag:ZnIn_(2)S_(4)复合材料光催化剂。使用X射线粉末衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线光电子能谱(XPS)、紫外-可见漫反射光谱(UV-Vis DRS)以... 详细信息

采用低温油浴的方法,制备出具有“TypeⅡ”异质结构的In_(2)O_(3)/Ag:ZnIn_(2)S_(4)复合材料光催化剂。使用X射线粉末衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线光电子能谱(XPS)、紫外-可见漫反射光谱(UV-Vis DRS)以及光电化学测试(PEC)等技术对物相、形貌结构、元素化合状态、光响应特性等方面进行探究。在可见光照射下进行光解水制氢和光降解甲基橙(MO)实验来评价光催化剂的光催化活性,结果表明,粉末状光催化剂In_(2)O_(3)/40.0%(质量分数)Ag:ZnIn_(2)S_(4)的光催化制氢速率达到21.85μmol·h^(-1),约是In_(2)O_(3)和Ag:ZnIn_(2)S_(4)的57.5倍和1.5倍。在可见光下的降解MO实验中,In_(2)O_(3)/40.0%Ag:ZnIn_(2)S_(4)光降解速率为0.3466 min^(-1),分别约是In_(2)O_(3)和Ag:ZnIn_(2)S_(4)的105倍和2.1倍。这主要归因于In_(2)O_(3)和Ag:ZnIn_(2)S_(4)之间形成的“TypeⅡ”异质结构,促使光生载流子的快速迁移和分离。

关键词：催化剂复合材料降解制氢 ZnIn2S4 In2O3

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Laboratory evaluation of high-friction thin overlays for pavement preservation

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Frontiers of Structural and Civil Engineering 2024年第6期18卷 936-948页

作者： Ouming xu Rentao xu Lintong JIN School of Highway Chang’an UniversityXi’an 710064China School of Materials Science and Engineering Chang’an UniversityXi’an 710061China

Traditional asphalt concrete(AC)and stone matrix asphalt(SMA),which are used as thin asphalt overlays,are common maintenance strategies to enhancing ride quality,skid resistance,and ***,several studies have used a novel asphalt mixture known as a high-friction thin overlay(HFTO)to improve surface ***,it remains uncertain whether the laboratory properties of HFTO differ significantly from those of conventional *** study aims to evaluate the laboratory properties of HFTO mixtures and compare them with those of AC and *** mixtures with nominal maximum size of 9.5 mm were produced in the laboratory,and performance tests were conducted,including wheel tracking test,low temperature flexural creep test,moisture susceptibility test,Cantabro Abrasion Test,Marshall Test,sand patch test,British pendulum test,and indoor tire-rollingdown *** results showed that the HFTO exhibited a lower tire/pavement noise than the AC and ***,HFTO had superior high-temperature stability,larger macro texture,and higher skid resistance in comparison to those of AC,but lower than those of ***,HFTO mixtures may be considered a suitable replacement for traditional AC mixtures in regions where skid resistance and noise reduction are concerns.

关键词： road engineering pavement maintenance high friction thin overlay performance skid resistance tire/pavement noise

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Aldehyde oxidase mediated enantioselective metabolic health risk of dinotefuran

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Science China Chemistry 2024年第6期67卷 2079-2091页

作者： Liwei xu Xinxin xu Hua Kuang Chuanlai xu Xiaoling Wu State Key Laboratory of Food Science and Resources Jiangnan UniversityWuxi214122China International Joint Research Laboratory for Biointerface and Biodetection and School of Food Science and Technology Jiangnan UniversityWuxi214122China Collaborative Innovation center of Food Safety and Quality Control in Jiangsu Province Jiangnan UniversityWuxi214122China

Chiral pollutants often pose significant differential environmental health *** this study,the biotransformation of chiral dinotefuran(DIN)and its enantioselective metabolic toxicity mechanisms have been systemically ***,reversedphase chromatography-high resolution mass spectrometry was developed to quantify the content of DIN R/S chiral enantiomer with pg level sensitivity,revealing a lower elimination rate constant(K_(e))of S-DIN(0.730 h^(-1))than R-DIN(0.746 h^(-1)).Secondly,the interaction mechanism between DIN metabolism and important endogenous bioactive molecules,such as aldehyde oxidase(AOX)and neurotransmitters,was *** DIN nitro-group was converted into a guanidine group by the reducing site of nearby flavin adenine dinucleotide(FAD)in AOX with the preferred higher affinity of ***,the endogenous tryptophan(Trp)aldehyde metabolic intermediate,5-hydroxyindoleacetaldehyde(5-HIAL),provides a persistent electron donor for DIN reduction via the oxidation-catalyzed site in AOX,resulting in remarkable up-regulation of monoamine neurotransmitters such as serotonin and ***,the higher level of neurotransmitters further mediated dysregulation of oxylipin homeostasis via the serotonergic pathway,where S-DIN exhibited more pronounced liver lipid damage and environmental health risk with the accumulated lipid biomarkers,oxidized triglyceride(OxTG)and oxidized sphingomyelin(OxSM).This study elucidates the AOX-mediated enantioselectivity metabolic pathway of DIN,providing a new analytical method for chiral pollutants and paves the way for their health risk assessments.

关键词： neonicotinoid dinotefuran enantiomer aldehyde oxidase metabolomics health risk

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Granting strength to aerogel fibers through encapsulation

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Science China Materials 2024年第4期67卷 1365-1366页

作者： Wenhui xu Department of Basic Chemistry School of PharmacyJiangxi University of Chinese MedicineNanchang 330004China

Aerogel fibers, distinguished by their lightweight nature, pronounced porosity, large surface area, and superior thermal insulation properties, have diversified applications in thermal management, energy devices, and environmental remediation[1]. However, compared with monolithic ones, these fibershaped aerogels exhibit limited mechanical strength and resilience due to their one-dimensional small size.

关键词： strength fibers thermal

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