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Ferrihydrite transformation impacted by coprecipitation of lignin:Inhibition or facilitation?

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Journal of Environmental Sciences 2024年第5期139卷 23-33页

作者： lin Liu zhihui Yang Weichun Yang Wen Jiang Qi Liao Mengying Si Feiping Zhao School of Metallurgy and Environment Central South UniversityChangsha 410083China Chinese National Engineering Research Center for Control&Treatment of Heavy Metal Pollution(CNERC-CTHMP) Changsha 410083China

Lignin is a common soil organic matter that is present in soils,but its effect on the transformation of ferrihydrite(Fh)remains *** matter is generally assumed to inhibit Fh ***,lignin can reduce Fh to Fe(Ⅱ),in which Fe(Ⅱ)-catalyzed Fh transformation ***,the effects of lignin on Fh transformation were investigated at 75℃ as a function of the lignin/Fh mass ratio(0-0.2),pH(4-8)and aging time(0-96 hr).The results of Fh-lignin samples(mass ratios=0.1)aged at different pH values showed that for Fh-lignin the time of Fh transformation into secondary crystalline minerals was significantly shortened at pH 6 when compared with pure Fh,and the Fe(Ⅱ)-accelerated transformation of Fh was strongly dependent on *** pH 6,at low lignin/Fh mass ratios(0.05-0.1),the time of secondary mineral formation decreased with increasing lignin *** high lignosulfonate-content material(lignin:Fh=0.2),Fh did not transform into secondary minerals,indicating that lignin content plays a major role in Fh *** addition,lignin affected the pathway of Fh transformation by inhibiting goethite formation and facilitating hematite *** effect of coprecipitation of lignin on Fh transformation should be useful in understanding the complex iron and carbon cycles in a soil environment.

关键词： Ferrihydrite transformation Lignin Hematite Goethite Fe(Ⅱ)-catalyzed Reactive Fe(Ⅲ)species

基于熵值法-TOPSIS的配电网供电可靠性评价

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电工技术 2024年第13期 23-26页

作者：林智辉赖永芳陈建立黄育欣胡金铭国网福建省石狮市供电有限公司福建泉州362700 天地电研(北京)科技有限公司北京102206

提出一种基于熵值-TOPSIS算法的配电网可靠性评价方法。综合考虑配电网特点及指标适用程度,构建出适用性较强的配电网评价指标体系,采用熵值法计算指标权重,结合TOPSIS算法计算出配电网各指标发展现状及水平,找出配电网发展薄弱点,为后... 详细信息

提出一种基于熵值-TOPSIS算法的配电网可靠性评价方法。综合考虑配电网特点及指标适用程度,构建出适用性较强的配电网评价指标体系,采用熵值法计算指标权重,结合TOPSIS算法计算出配电网各指标发展现状及水平,找出配电网发展薄弱点,为后续配电网规划指明方向。

关键词：配电网评价 TOPSIS 熵值法供电可靠性

Oblique impact breakage unification of nonspherical particles using discrete element method

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Particuology 2024年第7期90卷 61-71页

作者： Di Peng LiGe Wang Yuquan lin Chongqiang Zhu Xizhong Chen zhihui Liu Ruihuan Ge Shenzhen Research Institute of Shandong University Shenzhen 518057China Institute of Foundation Engineering China Academy of Building ResearchBeijing 100013China Ubiquitous Particle Ltd. TwickenhamLondon TW27AUUK Department of Smart Manufacturing and Engineering Software School of Qilu TransportationShandong UniversityJinan 250061China Department of Geotechnical Engineering Tongji UniversityShanghai 200092China School of Transportation and Civil Engineering Shandong Jiaotong UniversityJinan 250357China School of Science and Engineering University of DundeeDundee DD14HNUK Department of Chemical Engineering School of Chemistry and Chemical EngineeringShanghai Jiao Tong UniversityShanghai 200240China Department of Chemical and Biological Engineering University of SheffieldSheffield S13JDUK

Particle breakage commonly occurs during processing of particulate materials,but a mechanistic model of particle impact breakage is not fully *** article presents oblique impact breakage characteristics of nonspherical particles using discrete element method(DEM)*** different particle shapes,***,cuboidal and cylindrical,are *** spheres are agglomerated with bridging bonds to model the breakage characteristics under impact *** effect of agglomerate shapes on the breakage pattern,damage ratio,and fragment size distribution is fully *** using a newly proposed oblique impact model,unified breakage master surfaces are theoretically constructed for all the particle shapes under oblique impact *** developed approach can be applied to modelling particulate processes where nonspherical particles and oblique impact breakage are prevailing.

关键词： Breakage master curve Nonspherical particle Oblique impact Equivalent velocity Discrete element method(DEM) Bonded contact model

Role of Multi-scale Hierarchical Structures in Regulating Wetting State and Wetting Properties of Structured Surfaces

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Journal of Bionic Engineering 2024年第3期21卷 1347-1359页

作者： Yue Jiang Xinyi Li Zhichao Ma zhihui Zhang Cuie Wen Zhonghao Jiang Nan lin Luquan Ren Key Laboratory of Bionic Engineering of Ministry of Education College of Biological and Agricultural EngineeringJilin UniversityChangchun130022China Hubei Provincial Engineering Technology Research Center for Microgrid College of Electrical Engineering and New EnergyChina Three Gorges UniversityYichang443002China School of Mechanical and Aerospace Engineering Jilin UniversityChangchun130025China Centre for Additive Manufacturing School of EngineeringRMIT UniversityMelbourneVictoria3001Australia Key Laboratory of Automobile Materials of Ministry of Education College of Materials Science and EngineeringJilin UniversityChangchun130025China State Key Laboratory of Inorganic Synthesis and Preparative Chemistry Jilin UniversityChangchun130012China

Amplifying the intrinsic wettability of substrate material by changing the solid/liquid contact area is considered to be the main mechanism for controlling the wettability of rough or structured *** theoretical analysis and experimental exploration,we have found that in addition to this wettability structure amplification effect,the surface structure also simultaneously controls surface wettability by regulating the wetting state via changing the threshold Young angles of the Cassie-Baxter and Wenzel wetting *** wetting state regulation effect provides us with an alternative strategy to overcome the inherent limitation in surface chemistry by tailoring surface *** wetting state regulation effect created by multi-scale hierarchical structures is quite significant and plays is a crucial role in promoting the superhydrophobicity,superhydrophilicity and the transition between these two extreme wetting properties,as well as stabilizing the Cassie-Baxter superhydrophobic state on the fabricated lotus-like hierarchically structured Cu surface and the natural lotus leaf.

关键词： Hierarchical structure Wetting state regulation Wetting transition Superhydrophobicity Superhydrophilicity

Epitaxial quasi-2D/3D hybrid perovskite heterojunctions for photodetector with enhanced detectivity and stability

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Nano Research 2024年第7期17卷 6594-6602页

作者： Yifu Chen lin Zhang Xinxin Peng Weiran Qin Shiqing Li Yingwei Wang zhihui Chen Si Xiao Bin Yang Biao Liu Junliang Yang Han Huang Yun lin Jun He Liming Ding Yongbo Yuan Hunan Key Laboratory of Super Microstructure and Ultrafast Process School of PhysicsCentral South UniversityChangsha 410083China Hunan Key Laboratory of Nanophotonics and Devices School of PhysicsCentral South UniversityChangsha 410083China College of Materials Science and Engineering Hunan UniversityChangsha 410082China Department of Photoelectric Information School of PhysicsCentral South UniversityChangsha 410083China Center for Excellence in Nanoscience Key Laboratory of Nanosystem and Hierarchical FabricationNational Center for Nanoscience and TechnologyChinese Academy of ScienceBeijing 100190China

Although numerous metal halide perovskite materials have been investigated in the field of optoelectronic,the development of perovskite heterojunctions with exotic structures is still ***,we report the epitaxial growth of quasi-two-dimensional(Q-2D)perovskites on methylammonium lead iodide(MAPbI_(3))single crystals to form perovskite heterojunctions with interfacial *** MAPbI_(3)adjacent to epitaxial Q-2D perovskite shows blue shifted photoluminescence with shortened lifetime,which becomes significant with the reduced layer number of the Q-2D *** findings suggest the presence of an interfacial strain gradient leading to enhanced photocarrier ***,compared to the MAPbI_(3)single crystal detector,the BA_(2)MAPb_(2)I_(7)/MAPbI_(3)(BA:n-butylamine)heterojunction-based photodetector demonstrates a bandpass detecting property and exhibits 5 times enhanced external quantum efficiency and 83 times enhanced specific detectivity(D*=3.26×10^(11)Jones).Remarkably,the unencapsulated BA_(2)MAPb_(2)I_(7)/MAPbI_(3)heterojunction is stable in ambient condition for>300 *** Q-2D/3D heterojunction shows suppressed ion inter-diffusion due to the presence of Q-2D phase.

关键词： epitaxial growth interfacial strain quasi-two-dimensional/three-dimensional(Q-2D/3D)heterojunctions ion inter-diffusion

Spatiotemporal changes in vegetation coverage and its driving factors in the Three-River Headwaters Region during 2000-2011

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Journal of Geographical Sciences 2014年第2期24卷 288-302页

作者： LIU Xianfeng ZHANG Jinshui ZHU Xiufang PAN Yaozhong LIU Yanxu ZHANG Donghai lin zhihui State Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal University Beijing 100875 China College of Resources Science & Technology Beijing Normal University Beijing 100875 China College of Urban and Environmental Sciences Peking University Beijing 100871 China College of Tourism and Environment Shaanxi Normal University Xi'an 710062 China

The Three-River Headwaters Region （TRHR）, which is the source area of the Yangtze River, Yellow River, and Lancang River, is of key importance to the ecological secu- rity of China. Because of climate changes and human activities, ecological degradation oc- curred in this region. Therefore, ＂The nature reserve of Three-River Sou,＇ce Regions＂ was established, and ＂The project of ecological protection and construction for the Three-River Headwaters Nature Reserve＂ was implemented by the Chinese government. This study, based on MODIS-NDVI and climate data, aims to analyze the spatiotemporal changes in vegetation coverage and its driving factors in the TRHR between 2000 and 2011, from three dimensions. linear regression, Hurst index analysis, and partial correlation analysis were employed. The results showed the following：（1） In the past 12 years （2000-2011）, the NDVI of the study area increased, with a linear tendency being 1.2%/10a, of which the Yangtze and Yellow River source regions presented an increasing trend, while the Lancang River source region showed a decreasing trend. （2） Vegetation coverage presented an obvious spatial difference in the TRHR, and the NDVI frequency was featured by a bimodal structure. （3） The area with improved vegetation coverage was larger than the degraded area, being 64.06% and 35.94%, respectively during the study period, and presented an increasing trend in the north and a decreasing trend in the south. （4） The reverse characteristics of vegetation cov- erage change are significant. In the future, degradation trends will be mainly found in the Yangtze River Basin and to the north of the Yellow River, while areas with improving trends are mainly distributed in the Lancang River Basin. （5） The response of vegetation coverage to precipitation and potential evapotranspiration has a time lag, while there is no such lag in the case of temperature. （6） The increased vegetation coverage is mainly attributed to the warm-wet climate change an

关键词： vegetation coverage spatiotemporal change future trend influence factors Three-River HeadwatersRegion

中国入境旅游城市合作网络时空格局及驱动因素

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地理学报 2022年第8期77卷 2034-2049页

作者：林志慧陈瑛刘宪锋马耀峰陕西师范大学地理科学与旅游学院西安710119

基于1997—2017年中国60个城市入境旅游经济发展数据,辅以修正的引力模型和社会网络分析方法,系统分析了中国入境旅游城市合作网络时空格局,并借助二次指派程序方法对合作网络演变的驱动因素进行探讨。结果表明:(1)中国60个入境旅游城... 详细信息

基于1997—2017年中国60个城市入境旅游经济发展数据,辅以修正的引力模型和社会网络分析方法,系统分析了中国入境旅游城市合作网络时空格局,并借助二次指派程序方法对合作网络演变的驱动因素进行探讨。结果表明:(1)中国60个入境旅游城市合作网络强度逐渐增强,国家层面合作网络结构逐渐显现,合作强度前5名的分别为广州—深圳、北京—上海、北京—天津、上海—苏州和上海—深圳。(2)整体网络特征上,网络密度逐渐增加,整体网络通达度在提升,城市“领导者”地位在下降,网络整体均衡性在提升,且中国东、中、西三大地区间差异显著,东部地区城市合作最紧密,西部地区城市次之,中部地区城市紧密度最小。(3)个体网络特征上,将中国入境旅游城市分为外向型、内聚型、均衡发展型和孤立型4类,且权力角色上呈核心领导者、次核心领导者、一般合作者和边缘合作者的“核心—边缘”分布格局。(4)地理空间邻近性、旅游资源差异、旅游接待能力差异、城市规模等级和旅游交通情况的相近性对网络提升具有显著影响,对外经济贸易差异对中、西部地区城市旅游合作的影响是正向的,而对整体网络和东部网络的影响是负向的。

关键词：入境旅游城市合作网络时空格局驱动因素社会网络分析中国

Luminescence-activated Pt(Ⅳ)prodrug for in situ triggerable cancer therapy

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Chinese Chemical Letters 2024年第7期35卷 383-387页

作者： Huijie An Chen Yang zhihui Jiang Junjie Yuan Zhongming Qiu Longhao Chen Xin Chen Mutu Huang linlang Huang Hongju lin Biao Cheng Hongjiang Liu Zhiqiang Yu General Hospital of Southern Theatre Command PLAGuangzhou 510010China The 925th Hospital of The Chinese People's Liberation Army Guiyang 550025China The 903rd Hospital of The People's Liberation Army Hangzhou 310007China The Second Hospital of Hebei Medical University Shijiazhuang 050000China The Tenth Affiliated Hospital of Southern Medical University(Dongguan people's hospital) Dongguan 523018China

Anticancer platinum prodrugs that can be controllably activated are highly desired for personalized precision medicine and patient compliance in cancer ***,the clinical application of platinum(Ⅳ)prodrugs(Pt(Ⅳ))is restricted by tissue penetration of external ***,we report a novel Pt(Ⅳ)activation strategy based on endogenous luminescence of tumor microenvironment responsiveness,which completely circumvents the limitation of external *** designed Pt(Ⅳ)–Lu,a mixture of trans,trans,trans-[Pt(N_(3))_(2)(OH)_(2)(py)_(2)]and luminol(Lu),has controllable activation property:it remains inert in reductant environment and normal tissues,but under tumor microenvironment,Lu will be oxidized to produce blue luminescence,which rapidly reduce Pt(Ⅳ)to Pt(Ⅱ)without the need of any external ***(Ⅳ)–Lu shows excellent responsive antitumor ability both in vitro and in *** to cisplatin,the median lethal dose in BALB/c mice increased by an order of *** results suggest that Pt(Ⅳ)–Lu exhibits highly controllable activation property,superior antitumor activity,and good biosafety,which may provide a novel strategy for the design of platinum prodrugs.

关键词： Tumor microenvironment Endogenous luminescence Platinum(Ⅳ)prodrug Activation strategy Antitumor Biosafety

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电线电缆引燃机理及燃烧特性研究综述

高电压技术 2022年第2期48卷 612-625页

作者：吕亮段成汲胜昌饶子麒徐明阳林志辉西安交通大学电力设备电气绝缘国家重点实验室西安710049

电线电缆作为电力系统中重要的电能传输设备,其产量大、敷设面广,与生产生活息息相关。然而,由于其工作环境复杂、运行条件各异,且绝缘材料易燃,火灾事故时有发生。电线与电缆在结构、尺寸、材料、用途、电压等级、负载水平等方面存在差... 详细信息

电线电缆作为电力系统中重要的电能传输设备,其产量大、敷设面广,与生产生活息息相关。然而,由于其工作环境复杂、运行条件各异,且绝缘材料易燃,火灾事故时有发生。电线与电缆在结构、尺寸、材料、用途、电压等级、负载水平等方面存在差异,但致灾过程却有很多相似之处,可分为引燃、燃烧、熄灭3个阶段。电线电缆火灾除了由于自身故障而直接引发火灾外,还包括外部热源导致的故障。该文从不可靠连接、碳化路径电弧、空气电弧、外部热源、线芯过热、短路6个方面分别阐述了导致电线电缆起火的原因,简要介绍了上述多种因素综合作用下的引燃机理。同时对电线电缆的燃烧特性及其试验进行综述,并指出目前研究中存在的不足及今后应重点关注的问题,对于指导防火措施的实施具有重要意义。

关键词：电线电缆火灾引燃机理燃烧特性电弧