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Effects of contamination of single and combined cadmium and mercury on the soil microbial community structural diversity and functional diversity

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Chinese Journal Of Geochemistry 2011年第3期30卷 366-374页

作者： XIE Xiaomei LIAO Min ma aili ZHANG Haijun The Center of Experiment Teaching College of Environmental and Resource Sciences Zhejiang University Hangzhou 310058 China Department of Resources Science College of Environmental and Resources Sciences Zhejiang University Hangzhou 310058 China Zhejiang Provincial Key Laboratory of Subtropical Soil and Plant Nutrition Hangzhou 310058 China

To assess the effects of single and combined pollution of cadmium (Cd) and mercury (Hg) on soil micro-bial community structural and functional diversities, an incubation experiment was conducted, by employing two soils, namely, the marine sediment silty loam soil and the yellowish-red soil, in which five levels of Cd, Hg and Cd and Hg in combination were added. After being incubated for 56 days, the phospholipid fatty acids (PLFAs) profile and sole carbon source utilization pattern (BIOLOG) of the samples were tested. The results showed that the compo-sition of the microbial communities changed significantly at different levels of metals application. The principal component analyses (PCA) of PLFAs indicated that the structure of the microbial community was also significantly altered with increasing levels of metals, with increasing PLFAs biomarkers for fungi and actinomycetes, and in-creasing ratio of Gram-positive to Gram-negative bacteria. Sole carbon source utilization pattern analysis revealed that single and combined application of Cd and Hg inhibited significantly the functional activity of soil microorgan-isms, the functional diversity indices [Richness (S), Shannon-Wiener indices (H) and Evenness (EH)] were signifi-cantly lower in polluted soils than those in non-polluted soils, which also significantly altered with increasing levels of metals. PCA for the sole carbon source utilization pattern also indicated that the metal contamination could result in a variable soil microbial community. The results revealed that the combination of Cd and Hg had higher toxicity to soil microbial community structural and functional diversities than the individual application of Cd or Hg.

关键词：微生物群落结构镉(Cd) 功能多样性污染土壤重金属污染汞土壤微生物群落多样性指数

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Correlation Between Microstructure and Corrosion Behavior of Two 90Cu10Ni Alloy Tubes

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Acta Metallurgica Sinica(English Letters) 2014年第4期27卷 730-738页

作者： aili ma Shengli Jiang Yugui Zheng Zhiming Yao Wei Ke Shuang Xia Key Laboratory of Nuclear materials and Safety Assessment Institute of Metal ResearchChinese Academy of Sciences Institute of materials Shanghai University

Two kinds of 90Cu10 Ni tubes with different service lives（more than 3 years and only 1 year,respectively）under identical working conditions were studied by an immersion test in a 3.5 wt% NaCl solution and the electron backscattered diffraction（EBSD） *** morphology after immersion showed severer corrosion attack at the grain boundaries of the tube with shorter service life compared with the tube with longer service *** grain boundary characterization distributions（GBCDs） of the two tubes obtained by EBSD revealed more Σ3 boundaries and twins,and larger random boundary meshes in the tube with longer service life.A short immersion test in a modified Livingston＇s solution was conducted to evaluate the tendency to corrosion attack of different types of the grain *** and AFM were used to characterize the corrosion morphologies of the boundaries.A strong correlation between varying depths of corrosion grooves and types of the grain boundaries was *** influence of deviation angle of low Σ boundaries on corrosion resistance of the grain boundaries was also *** is concluded that a special ‘‘grain boundary engineering＇＇（GBE） treatment has been performed on the tube with longer service *** is proposed that the optimized GBCD is responsible for the better service performance of the tube.

关键词： 90Cu10Ni alloy Corrosion resistance Grain boundary Twin Σ3 boundary Electron backscattered diffraction

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Effect of surface damage induced by cavitation erosion on pitting and passive behaviors of 304L stainless steel

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International Journal of Minerals,Metallurgy and materials 2023年第7期30卷 1338-1352页

作者： Liang Li Yanxin Qiao Lianmin Zhang aili ma Enobong Felix Daniel Rongyao ma Jian Chen Yugui Zheng School of materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China CAS Key Laboratory of Nuclear materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Shenyang National Research Center for materials Science Institute of MetalsChinese Academy of SciencesShenyang 110016China

The corrosion behavior of 304L stainless steel(SS)in 3.5wt%NaCl solution after different cavitation erosion(CE)times was mainly evaluated using electrochemical noise and potentiostatic polarization *** was found that the antagonism effect resulting in the passivation and depassivation of 304L SS had significant distinctions at different CE *** passive behavior was predominant during the incubation period of CE where the metastable pitting initiated at the surface of 304L *** the rising period of CE,the 304L SS experienced a transition from passivation to depassivation,leading to the massive growth of metastable pitting and stable *** depassivation of304L SS was found to be dominant at the stable period of CE where serious localized corrosion occurred.

关键词： cavitation erosion pitting stainless steel electrochemical noise

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自复位混凝土剪力墙研究进展

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低温建筑技术 2024年第1期46卷 14-17,27页

作者：冯鹏杰郑杰马嫒丽高丽燕张效伟莫正波青岛理工大学理学院山东青岛266000 青岛义和钢构集团有限公司山东青岛266000

自复位剪力墙在遭受地震时能够实现大位移而不会有明显的残余变形或大量损伤,适用于地震后的快速恢复结构。为研究自复位混凝土剪力墙的发展趋势,文中介绍了国内外自复位混凝土剪力墙结构的相关研究进展,对相关研究进行展望和总结,表明... 详细信息

自复位剪力墙在遭受地震时能够实现大位移而不会有明显的残余变形或大量损伤,适用于地震后的快速恢复结构。为研究自复位混凝土剪力墙的发展趋势,文中介绍了国内外自复位混凝土剪力墙结构的相关研究进展,对相关研究进行展望和总结,表明在自复位混凝土剪力墙中加入耗能部件或选择合适的配筋方式,可以改善墙体的力学性能并控制损伤。

关键词：可恢复性自复位残余变形后张无黏结预应力

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改性新型涂层材料制备及其防腐性能研究

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中国胶粘剂 2024年第8期33卷 60-67页

作者：张滨莹叶一鸣文振兴陈佳雨祁滔何晓红马艾丽北京理工大学珠海学院广东珠海519088

为了解决纳米SiO_(2)、六方氮化硼(BN)固体填料在树脂中的分散效果,利用硅烷偶联剂(KH-560)对二者进行表面处理。在共混体系中加入偶联剂作相容剂,增加与聚二甲基硅氧烷(PDMS)及环氧树脂的相容性,利用超声方式使复合体系充分分散,以发... 详细信息

为了解决纳米SiO_(2)、六方氮化硼(BN)固体填料在树脂中的分散效果,利用硅烷偶联剂(KH-560)对二者进行表面处理。在共混体系中加入偶联剂作相容剂,增加与聚二甲基硅氧烷(PDMS)及环氧树脂的相容性,利用超声方式使复合体系充分分散,以发挥填料的性能,得到了具有疏水效果的防腐蚀环氧复合涂层。利用正交试验对其配方组成、涂层样品的各方面性能深入研究,并对其结构、接触角、附着力、电化学、耐介质腐蚀等方面进行测试和分析。研究结果表明:(1)硅烷偶联剂KH-560成功接枝于纳米SiO_(2)和六方BN上,在树脂中的相容性好。(2)根据对样品涂层各测试指标的结果分析,得到各填料添加量对各性能指标的影响程度及最佳水平级别。(3)填料的引入使涂层接触角有明显增加,接触角即涂层疏水性随3种填料添加量呈现正相关趋势。极差分析表明,3种填料的最佳水平均为第4水平,改性六方BN添加量水平对涂层疏水性影响最明显。(4)根据耐酸碱盐介质测试结果可知:涂层样品对于碱性和浓盐介质的防护能力优于对酸介质,在碱性及浓盐介质中基本不发生发泡、损坏、腐蚀现象。(5)正交试验中最佳配方为:PMDS添加量为0.5 g,改性纳米SiO_(2)添加量为2.0 g,改性六方BN添加量为1.00 g。

关键词：防腐涂料疏水性配方表面改性复合材料

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绿茶游离氨基酸总量近红外光谱定量分析模型优化

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农业机械学报 2008年第10期39卷 144-147,206页

作者：林新牛智有马爱丽刘辉华中农业大学工程技术学院

采集158份绿茶样品并对其进行光谱扫描,分别采用主成分回归、偏最小二乘、改进偏最小二乘3种定量校正方法,对原始光谱分别进行4种不同的预处理,运用正交试验设计,建立了绿茶中游离氨基酸总量优化定标模型,利用目标函数法对模型进行评定... 详细信息

采集158份绿茶样品并对其进行光谱扫描,分别采用主成分回归、偏最小二乘、改进偏最小二乘3种定量校正方法,对原始光谱分别进行4种不同的预处理,运用正交试验设计,建立了绿茶中游离氨基酸总量优化定标模型,利用目标函数法对模型进行评定,并对模型的适用性进行了验证。试验结果为:SNV+Detrend,1,1,4,4的光谱预处理下,采用改进偏最小二乘法进行定标建立的模型最优,其目标函数值f为94.25%,验证相对标准差eRSD为6.39%(<10%)。结果表明:采用正交试验设计能够综合考查不同的校正方法和光谱预处理对模型的影响,利用近红外光谱分析法能够实现绿茶中游离氨基酸总量的定量、快速检测。

关键词：绿茶游离氨基酸总量近红外光谱定量分析优化

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Regulation of specific abnormal calcium signals in the hippocampal CA1 and primary cortex M1 alleviates the progression of temporal lobe epilepsy

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Neural Regeneration Research 2024年第2期19卷 425-433页

作者： Feng Chen Xi Dong Zhenhuan Wang Tongrui Wu Liangpeng Wei Yuanyuan Li Kai Zhang Zengguang ma Chao Tian Jing Li Jingyu Zhao Wei Zhang aili Liu Hui Shen Laboratory of Neurobiology School of Biomedical EngineeringTianjin Medical UniversityTianjinChina Institute for Translational Neuroscience the Second Affiliated Hospital of Nantong UniversityNantongJiangsu ProvinceChina Institute for Translational Brain Research Fudan UniversityShanghaiChina Department of Radiology the Affiliated Drum Tower Hospital of Nanjing University Medical SchoolNanjingJiangsu ProvinceChina Innovative Institute of Chinese Medicine and Pharmacy Shandong University of Traditional Chinese MedicineJinanChina Department of Anesthesiology Tianjin Medical University General HospitalTianjinChina Department of Orthopaedics Tianjin Medical University General HospitalTianjinChina Tianjin Eye Hospital Tianjin Eye InstituteTianjin Key Lab of Ophthalmology and Visual ScienceTianjinChina Laboratory of Neurobiology School of Basic Medical SciencesTianjin Medical UniversityTianjinChina

Temporal lobe epilepsy is a multifactorial neurological dysfunction syndrome that is refractory,resistant to antiepileptic drugs,and has a high recurrence *** pathogenesis of temporal lobe epilepsy is complex and is not fully *** calcium dynamics have been implicated in temporal lobe ***,the effect of fluctuating calcium activity in CA1 pyramidal neurons on temporal lobe epilepsy is unknown,and no longitudinal studies have investigated calcium activity in pyramidal neurons in the hippocampal CA1 and primary motor cortex M1 of freely moving *** this study,we used a multichannel fiber photometry system to continuously record calcium signals in CA1 and M1 during the temporal lobe epilepsy *** found that calcium signals varied according to the grade of temporal lobe epilepsy *** particular,cortical spreading depression,which has recently been frequently used to represent the continuously and substantially increased calcium signals,was found to correspond to complex and severe behavioral characteristics of temporal lobe epilepsy ranging from gradeⅡto gradeⅤ.However,vigorous calcium oscillations and highly synchronized calcium signals in CA1 and M1 were strongly related to convulsive motor *** inhibition of pyramidal neurons in CA1 significantly attenuated the amplitudes of the calcium signals corresponding to gradeⅠ*** addition,the latency of cortical spreading depression was prolonged,and the above-mentioned abnormal calcium signals in CA1 and M1 were also significantly ***,it was possible to rescue the altered intracellular calcium *** simultaneous analysis of calcium signals and epileptic behaviors,we found that the progression of temporal lobe epilepsy was alleviated when specific calcium signals were reduced,and that the end-point behaviors of temporal lobe epilepsy were *** results indicate that the calcium dynamic between CA1 and M1 may reflect sp

关键词： Ca^(2+) calcium signals chemogenetic methods hippocampus primary motor cortex pyramidal neurons temporal lobe epilepsy

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Low-Enthalpy and High-Entropy Polymer Electrolytes for Li-Metal Battery

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Energy & Environmental materials 2024年第1期7卷 91-99页

作者： Haitao Zhang Yuchen Wang Junfeng Huang Wen Li Xiankan Zeng aili Jia Hongzhi Peng Xiong Zhang Weiqing Yang Key Laboratory of Advanced Technologies of materials Ministry of EducationSchool of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China Institute of Electrical Engineering Chinese Academy of SciencesBeijing 100190China

lonic-conductive solid-state polymer electrolytes are promising for the development of advanced lithium batteries yet a deeper understanding of their underlying ion-transfer mechanism is needed to improve *** we demonstrate the low-enthalpy and high-entropy(LEHE)electrolytes can intrinsically generate remarkably free ions and high mobility,enabling them to efficiently drive lithium-ion *** LEHE electrolytes are constructed on the basis of introducing CsPbl_(3)perovskite quantum dots(PQDs)to strengthen PEO@LiTFSI *** extremely stable cycling>1000 h at 0.3 ma cm^(-2)can be delivered by LEHE ***,the as-developed Li|LEHE|LiFePO_(4)cell retains 92.3%of the initial capacity(160.7 mah g^(-1))after 200 *** cycling stability is ascribed to the suppressed charge concentration gradient leading to free lithium *** is realized by a dramatic increment in lithium-ion transference number(0.57 vs 0.19)and a significant decline in ion-transfer activation energy(0.14 eV vs 0.22 eV)for LEHE electrolytes comparing with PEO@LiTFSI *** CsPbl_(3)PQDs promote highly structural disorder by inhibiting crystallization and hence endow polymer electrolytes with low melting enthalpy and high structural entropy,which in turn facilitate long-term cycling stability and excellent rate-capability of lithium-metal batteries.

关键词： charge concentration gradient lithium dendrites lithium-metal battery low-enthalpy and high-entropy polymer electrolyte

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Epidemiological Characteristics of Human Parainfluenza Viruses Infections-China,2019-2023

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China CDC weekly 2024年第12期6卷 235-241,I0003,I0004页

作者： Yixuan Gao Yingwei ma Daxing Feng Feng Zhang Biao Wang Xiaoqing Liu Bing Zhu Hui Xie Linqing Zhao Xiaoru Long Ying Chen Bing Wang Jie Jiang Zhen Zhu Yan Zhang aili Cui Baicheng Xia Naiying mao National Key Laboratory of Intelligent Tracking and Forecasting for Infectious Diseases National Institute for Viral Disease Control and PreventionChinese Center for Disease Control and PreventionBeijingChina Precision Medicine Research Center Children’s Hospital of ChangchunChangchun CityJilin ProvinceChina Henan Provincial Center for Disease Control and Prevention Zhengzhou CityHenan ProvinceChina Laboratory of Viral Diseases Qingdao Municipal Centre for Disease Control and PreventionQingdao CityShandong ProvinceChina Virus Laboratory Gansu Provincial Center for Disease Control and PreventionLanzhou CityGansu ProvinceChina Jiangxi Provincial Center for Disease Control and Prevention Nanchang CityGansu ProvinceChina Virus Laboratory Guangzhou Women and Children’s Medical CenterGuangzhou Medical UniversityGuangzhou CityGuangdong ProvinceChina Institute for Immunization and Prevention Beijing Center for Disease Prevention and ControlAcademy for Preventive MedicineInstitute of Tuberculosis Control Research and PreventionBeijingChina Laboratory of Virology Beijing Key Laboratory of Etiology of Viral Diseases in ChildrenCapital Institute of PediatricsBeijingChina Department of Infection Children’s Hospital of Chongqing Medical UniversityChongqingChina Inner Mongolia Autonomous Region Comprehensive Center for Disease Control and Prevention Hohhot CityInner Mongolia Autonomous RegionChina Shenyang Prefecture Center for Disease Control and Prevention Shenyang CityLiaoning ProvinceChina

Introduction:A retrospective study based on sentinel surveillance was conducted in 10 provinciallevel administrative divisions(PLADs)in China to enhance the understanding of the epidemiological characteristics of human parainfluenza viruses(HPIVs).Methods:From January 2019 to June 2023,respiratory specimens were collected from individuals with acute respiratory infections(ARIs)and screened for four HPIVs serotypes and other common respiratory viruses using multiplex real-time polymerase chain reaction(PCR).This study analyzed the association of HPIVs infections with seasonal patterns,geographical distribution,demographic profiles,clinical features,and co-infection ***:During the study period,a total of 12,866 ARIs were *** overall detection rate of HPIVs was 6.15%,varying from 5.04%in 2022 to 9.70%in *** median age of HPIVs-infected patients was 3 ***2 was more prevalent among individuals aged 5–17 years(42.57%),while HPIV4 was more common in those over 65 years(12.24%).HPIV3(54.16%)and HPIV1(27.18%)were the predominant serotypes,and their prevalence exhibited significant seasonal fluctuations postcoronavirus disease 2019(COVID-19)*** peak of HPIV3 shifted three months later in 2020 compared to 2019 and returned to a summer peak *** peaks of HPIV1 were observed in 2021 following the peak of ***,coinfections were frequent in HPIVs cases(overall rate:22.12%),with human rhinovirus being the most common co-infecting ***:The prevalence of HPIVs in China was predominantly due to HPIV3 and HPIV1,and their seasonal patterns were altered by pandemic ***,continuous surveillance of HPIVs is essential.

关键词： prevalence seasonal Human

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收割期芦竹底部茎秆机械物理特性参数的试验研究

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农业工程学报 2007年第4期23卷 124-129页

作者：廖宜涛廖庆喜田波平舒彩霞王静马爱丽华中农业大学工程技术学院武汉430070

试验研究芦竹底部茎秆的机械物理特性,以获得其最大破坏应力、弹性模量等机械物理特性参数,并分析芦竹切割过程中应力、应变分布状态,能为芦竹切割刀具和切割方式的设计提供理论依据和基础技术参数,对低能耗、高效率的芦竹切割器的设计... 详细信息

试验研究芦竹底部茎秆的机械物理特性,以获得其最大破坏应力、弹性模量等机械物理特性参数,并分析芦竹切割过程中应力、应变分布状态,能为芦竹切割刀具和切割方式的设计提供理论依据和基础技术参数,对低能耗、高效率的芦竹切割器的设计具有重要的指导意义。该文利用微机控制电子万能材料试验机对收割期的芦竹底部的茎秆进行了顺纹拉伸、压缩、弯曲试验,获得试验条件下顺纹拉伸、压缩、弯曲的应力-应变曲线,并进行了分析。试验测得芦竹底部茎秆顺纹拉伸最大抗拉强度平均值为123 MPa,弹性模量值为1260 MPa;顺纹压缩最大抗压强度平均值为52 MPa,弹性模量值为595 MPa;顺纹弯曲最大抗弯强度平均值为125 MPa,弹性模量值为1715 MPa。结果表明,芦竹破坏应力参数接近毛竹,远大于玉米、小麦等茎秆的破坏应力参数,芦竹的机械化收割不宜采用传统的切割器。

关键词：芦竹茎秆弹性模量破坏应力切割

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