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Joint toxic effects of heavy metals and atrazine on invasive plant species Solidago Canadensis L.

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Chinese Journal Of Geochemistry 2011年第4期30卷 523-530页

作者： han zhaoxiang HE Guandong WANG Jiahong LU Chunxia School of Chemical Engineering Huaihai Institute of Technology Lianyungang 222005 China School of the Environment Nanjing University Nanjing 210093 China Jiaonan Agricultural Bureau Qingdao 266400 China

In this study, the joint effects of Cd(Ⅱ), Pb(Ⅱ) and atrazine (ATR) on Solidago Canadensis L. were investigated. The results showed that soil containing Cd, Pb and ATR could inhibit root elongation of Solidago Canadensis L., and that there was a positive linear relationship between the inhibitory rate of root elongation and the concentrations of Pb(Ⅱ). The mixture of Cd(Ⅱ) and Pb(Ⅱ)-ATR in soil showed a significant adverse effect on root and shoot biomass of Solidago Canadensis L. Acetylsalicylic acid (ASA) contents increased slightly at the lower concentrations of Cd(Ⅱ)-ATR, then decreased when Cd(Ⅱ)-ATR concentrations were higher than those of 1.0 TUmix(Cd+ATR). The toxic effect of Pb(Ⅱ)-ATR on the ASA contents of Solidago Canadensis L. was greater than that of Cd(Ⅱ)-ATR. Soluble sugar contents firstly decreased and then increased with increasing concentrations of Cd(Ⅱ)-ATR and displayed fluctuation with increasing concentrations of Pb(Ⅱ)-ATR. Total protein contents in-creased with increasing concentrations of Cd(Ⅱ) and Pb(Ⅱ)-ATR , relative to the control sample. The NP-SH con-tents showed a significant increase up to 12.2 mg/gfw of Cd(Ⅱ)-ATR, followed by a significant decline to 4.5 mg/gfw after 14 days of exposure. The effect of Pb(Ⅱ)-ATR was similar to that of Cd(Ⅱ)-ATR but the amount of NP-SH was not higher than that of Cd(Ⅱ)-ATR.

关键词：加拿大一枝黄花联合毒性作用莠去津入侵植物 ATR技术重金属地上部生物量可溶性糖含量

Immunotoxicity and hepatotoxicity of PFOS and PFOA in tilapia(Oreochromis niloticus)

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Chinese Journal Of Geochemistry 2012年第4期31卷 424-430页

作者： han zhaoxiang LIU Yurong WU Dandan ZHU Zhen Lu Chunxia School of Chemical Engineering Huaihai Institute of TechnologyLianyungang 222005China Chongqing Key Laboratory of Micro/Nano Materials Engineering and Technology Chongqing 402160China Jiangsu Provincial Key Laboratory of Coastal Wetland Bioresources and Environmental Protection Yancheng 224002China Jiaonan Agricultural Bureau of China Qingdao 266400China

Perfluorinated organic compounds(PFOCs) are emerging persistent organic pollutants(POPs) widely distributed in the environment,wildlife and *** studied the toxicology of perfluorooctane sulfonate(PFOS) and perfluorooctanoic acid(PFOA) on immunotoxicity and hepatotoxicity in primarily cultured hepatocytes of freshwater tilapia(Oreochromis niloticus).Cultured hepatocytes were exposed to PFOS or PFOA(0,10,20 and 30 mg/L) for 24,48,72,96,120 and 144 hours,*** doses of these compounds that induce significantly detectable immunotoxicity and hepatotoxicity were employed in the *** response to PFOS,the leukocytes,B cells,granulocytes,and macrophages among the isolation of intrahepatic immune cells(IHIC) from PFOS-treated tilapia produced significant levels of immune cells compared with that of the control *** numbers of leukocytes,B cells,granulocytes,and macrophages for PFOS-treated tilapia increased with the incremental exposure ***,similar to the findings in PFOA toxicity effects,the erythropoietin levels in tilapia increased with the increase of the PFOS and PFOA *** lowest doses(10 mg/L) of PFOS exposure led to a marked inhibition in the hepatocyte viability in ***,tilapia exposed to PFOA demonstrated a similar pattern,and a dose-dependent decrease in the hepatocyte viability was observed in the following treatment of *** the 72 h exposures,ethoxy-resorufin-O-deethylase(EROD) activity was significantly induced with the increase concentrations in tilapia liver(phanges in the liver glycogen content,which depended on the duration of *** it appeared that the decrease in blood glucose level during the acclimation was followed by significant incr

关键词：尼罗罗非鱼 PFOA PFOS 免疫毒性肝毒性持久性有机污染物促红细胞生成素全氟辛烷

Mechanism investigation of pre-existing void-induced multi-modal electro-migration behavior

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Journal of Semiconductors 2022年第5期43卷 116-121页

作者： zhaoxiang han Weihai Fan Q&R Semiconductor Manufacturing International CorporationShanghai 201203China

A multi-modal time-to-failure distribution for an electro-migration(EM) structure has been observed and studied from long duration in-situ EM experiment, for which the failure mechanism has been investigated and discussed comprehensively. The mixed EM failure behavior strongly suggest that the fatal voids induced EM failure appear at various locations along the EM structure. This phenomenon is believed to be highly related to the existence of pre-existing voids before EM stress. Meanwhile, the number and location of the pre-existing voids can influence the EM failure mode significantly. Based on our research, a potential direction to improve the EM lifetime of Cu interconnect is presented.

关键词： reliability electro-migration multi-modal pre-existing void

A reverse particle grading strategy for design and fabrication of porous SiC ceramic supports with improved strength

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Journal of Advanced Ceramics 2024年第7期13卷 1011-1022页

作者： Zheng Liang han Zhang Yichuan Li Wenkang Zhang Jian Zhou Qilin Gu zhaoxiang Zhong Weihong Xing State Key Laboratory of Materials-Oriented Chemical Engineering National Engineering Research Center for Special Separation MembraneNanjing Tech UniversityNanjing 211816China Nanjing Membrane Application Institute Co. Ltd.Nanjing 210009China

Porous ceramics usually require high mechanical strength and maximized porosity simultaneously,while for conventional particle grading strategies,it is highly challenging to meet both *** this end,a reverse particle grading strategy was developed based on the linear packing model by unusually introducing coarse particles(d50=16μm)into a fine particle(d50=5μm)*** the extrusion and sintering process,tubular porous SiC ceramic supports with improved mechanical strength were successfully *** effects of coarse particles on the rheological properties of the ceramic paste and the macroscopic properties and microstructure of the SiC supports were systematically *** an increase in the content of coarse SiC particles to 30 wt%,the pressure generated during extrusion decreased from 5.5±0.2 to 1.3±0.1 ***,the bending strength of the tubular supports increased from 36.6±5.6 to 49.1±4.5 MPa when 20 wt%coarse powder was *** notably improved mechanical strength was attributed to the distribution of coarse particles that prolonged the route of crack ***,the optimized tubular supports had an average pore size of 1.2±0.1μm,an open porosity of 45.1%±1.6%,and a water permeability of 7163±150 L/(m2·h·bar)as well as good alkali and acid corrosion ***,the strategy was proven to be feasible for the scale-up fabrication of 19-channel SiC tubular porous ceramic supports.

关键词： porous SiC ceramic tubular ceramic support reverse particle grading reaction bonding chemical stability

有机先驱体法制备SiBONC陶瓷的高温性能及析晶过程

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稀有金属材料与工程 2006年第A02期35卷 228-231页

作者：李峰温广武韩兆祥哈尔滨工业大学黑龙江哈尔滨150001

通过有机聚合物先驱体法使用四氯化硅(SiCl4)、苯甲醛(PhCHO)、烷基胺(RNH2)、三氯化硼(BCl3)为原料,对SiO2基陶瓷进行了B,C,N的原子级掺杂,并用裂解制备的纳米陶瓷粉体热压烧结制备了一种硅基复合陶瓷。在气氛烧结炉中对粉体及块体材... 详细信息

通过有机聚合物先驱体法使用四氯化硅(SiCl4)、苯甲醛(PhCHO)、烷基胺(RNH2)、三氯化硼(BCl3)为原料,对SiO2基陶瓷进行了B,C,N的原子级掺杂,并用裂解制备的纳米陶瓷粉体热压烧结制备了一种硅基复合陶瓷。在气氛烧结炉中对粉体及块体材料的热稳定性及析晶情况进行研究。粉体及块体陶瓷材料在1700℃时仍保持非晶态,其析晶温度在1800℃以上,析出的上要物相为纳米级的SiC颗粒及少量BN,其质量损失率在1900℃时为4％左右。B,C,N的原子级掺杂有效的提高了硅基陶瓷的热稳定性和硅基陶瓷的析晶温度,由于纳米SiC颗粒的析出使SiO2基陶瓷的高温力学性能得到了提高。

关键词：先驱体有机聚合物热稳定性析晶

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栓皮栎种群变异与适应对策研究

林业科学 2005年第6期41卷 16-22页

作者：韩照祥山仑西北农林科技大学生命科学院中国科学院水利部水土保持研究所杨凌712100

从栓皮栎萌生苗的径级大小、数量、种群性状分化和内部基因层次上阐明其变异和适应对策,从机理上探讨栓皮栎对不同生境的适应对策。从萌生苗分布情况看,每个地区萌生苗的径级大小和数量均不同:在秦岭分布中心,萌生苗的数量相对较少,而... 详细信息

从栓皮栎萌生苗的径级大小、数量、种群性状分化和内部基因层次上阐明其变异和适应对策,从机理上探讨栓皮栎对不同生境的适应对策。从萌生苗分布情况看,每个地区萌生苗的径级大小和数量均不同:在秦岭分布中心,萌生苗的数量相对较少,而在巴山北坡和黄龙山区,几乎每个径级中都有一定数量的萌生苗;萌生幼苗的数量弥补了实生苗数量的不足,帮助栓皮栎种群度过幼苗匮乏期,使种群能够自我更新。在不同生境中栓皮栎种群的枝长、分枝角度、分枝率、等位基因频率和分化系数等性状参数也发生了变异,从分布中心到分布边缘,当年生枝条的长度逐渐减小,而分枝角度和叶倾角呈现出增大趋势,逐步分枝率R1∶2、R2∶3和总体分枝率Rb也存在明显的差异。EST、SOD2种酶的基因变异频率呈现出逐渐减小的趋势,而EST、SOD、PGI、ACP和ADH的分化系数则呈现出增大趋势。这些变化是栓皮栎种群应对外界环境的一种适应性反应。

关键词：栓皮栎种群变异适应对策

水汽侵入对Cu互连电迁移性能退化的影响机理

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半导体技术 2022年第4期47卷 302-306页

作者：范伟海韩兆翔中芯国际集成电路制造(上海)有限公司上海201203

随着超大规模集成电路(VLSI)工艺的发展及低介电常数(k)材料的引入,芯片及测试结构对于水汽侵入的影响愈加敏感,从而对Cu互连可靠性测试的准确性提出了严峻的挑战。通过设计的实验验证了水汽侵入对Cu互连电迁移性能退化的影响。借助失... 详细信息

随着超大规模集成电路(VLSI)工艺的发展及低介电常数(k)材料的引入,芯片及测试结构对于水汽侵入的影响愈加敏感,从而对Cu互连可靠性测试的准确性提出了严峻的挑战。通过设计的实验验证了水汽侵入对Cu互连电迁移性能退化的影响。借助失效分析手段,深入研究和讨论了水汽侵入的潜在影响机制。实验分析表明,水汽侵入对Cu互连的影响主要集中在使Cu互连金属自身发生氧化或使Ta/TaN金属阻挡层发生氧化两方面。基于该研究结果,提出了防止水汽侵入影响的有效措施,其对于保障Cu互连可靠性测试及集成电路制造工艺可靠性评估的准确性具有参考作用。

关键词：可靠性电迁移 Cu互连水汽侵入失效分析

甲硫醇在Co修饰MoS_2团簇边缘位的脱硫机理研究

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化学学报 2018年第1期76卷 62-67页

作者：张田郭琛魏淑贤武中华韩兆翔鲁效庆中国石油大学(华东)理学院青岛266580

由于国家对石油产品中含硫量的严格控制,原油脱硫已成为石油化工生产中的一项紧迫任务.硫化钼作为高效加氢脱硫催化剂而被广泛研究.过渡金属Co掺杂提高了传统钼基硫化物加氢脱硫催化剂的催化活性,目前被广泛应用于原油催化脱硫.本文采... 详细信息

由于国家对石油产品中含硫量的严格控制,原油脱硫已成为石油化工生产中的一项紧迫任务.硫化钼作为高效加氢脱硫催化剂而被广泛研究.过渡金属Co掺杂提高了传统钼基硫化物加氢脱硫催化剂的催化活性,目前被广泛应用于原油催化脱硫.本文采用密度泛函理论,对Co修饰MoS_2三角形团簇边缘不饱和活性位(CUS)的形成及甲硫醇的催化脱硫过程进行了理论研究.结果表明,活性位形成过程中,氢气裂解的活性位为Mo原子和S原子,随后形成硫化氢并脱附.甲硫醇倾向于吸附在CUS的TopCo位.通过电荷布居及前线轨道分析发现,Co的引入改变了表面原子电荷及CUS的LUMO轨道分布,并且Co表现出强吸电子能力,从而促进甲硫醇的吸附.CH_3SH最优脱硫路径为先后断裂S—H和C—S键形成甲烷实现脱硫,其中形成甲烷的基元步骤为整个脱硫反应的速率控制步骤,其能垒为1.51 e V.

关键词：二硫化钼甲硫醇脱硫不饱和活性位密度泛函理论

Naked Eye Based SNP Typing with Sub-Femtomole Sensitivity by a Gold Nanoparticle Based Homogeneous Sensing Assay

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Naked Eye Based SNP Typing with Sub-Femtomole Sensitivity by...