检索结果-南通市图书馆

Rare Metals 2023年第2期42卷 713-718页

作者： jia-min zhong Zong-An Li Xiao-Wei Zhang Lin Zhou Zhi-Qiang Wang De-Hong Chen National Engineering Research Center for Rare Earth Materials Grirem Advanced Materials Co.Ltd.General Research Institute for Nonferrous MetalsBeijing100088China

In order to solve the problem of large temperature difference between the center and ends of the metallic rod in the purification process of solid-state electrotransport(SSE),three types of electrode connections of tantalum and the corresponding rods of metallic lanthanum were designed,the temperature distributions of three kinds of rod were measured,and the influence of temperature difference on the purification effect of solid-state electrotransport was *** results indicate that the maximum temperature difference of the rod will be significantly reduced through decreasing the cross section of electrode connection to make its unit length resistance close to that of rod,or increasing the unit length resistance of the section at both ends of the *** these two measures are adopted at the same time,the effect of decreasing rod temperature difference is the best in the present study,and the maximum temperature difference of the rod can be reduced to 29℃when the maximum temperature of the rod is 820℃.The migration velocity of the impurities at rod ends can be obviously improved after the rod temperature difference is reduced,which enables the purification effect and efficiency of solid-state electrotransport to be greatly raised;it is also found that the major impurities iron in metallic lanthanum migrates more easily than oxygen and carbon during the purification of metal lanthanum with solid-state electrotransport.

关键词： Solid-state electrotransport Electrode connection Temperature difference Metallic lanthanum Purification effect

Migration regularities of impurities C,O,Fe,Co and Ni and effect of crystal transition on C,O and Fe in purification of metal La by solid-state electrotransport

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2021年第10期40卷 2985-2992页

作者： jia-min zhong De-Hong Chen Si-ming Pang Zong-An Li Lin Zhou Zhi-Qiang Wang National Engineering Research Center for Rare Earth Materials Grirem Advanced Materials Co.Ltd.Beijing 100088China

Migration regularities of impurities C,O,Fe,Co and Ni and the effect of crystal transition on C,O and Fe in purification of metal La by solid-state electrotransport(SSE)were *** impurity migration direction,removal extent and difficulty were intuitively judged by impurity residual rate distribution *** is indicated that major impurities Fe,Co,Ni,C and O in metal La are found to significantly migrate to anode and migration effects are much better with the increase in temperature and prolongation of time in purification of La by *** Fe,Co and Ni in La may be fast diffusion elements,which are very extreme to be removed,and removal difficulty is in the order of Fe

关键词： Solid-state electrotransport Puriﬁcation Lanthanum Impurity distribution Residual rate Crystal transition

Migration regularities of impurity aluminum and copper in purification of metal lanthanum by solid-state electrotransport

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2021年第8期40卷 2307-2312页

作者： Zhi-Qiang Wang Zong-An Li jia-min zhong De-Hong Chen Xiao-Wei Zhang Lin Zhou National Engineering Research Center for Rare Earth Materials Grirem Advanced Materials Co.Ltd.General Research Institute for Nonferrous MetalsBeijing100088China

In view of the previous studies on the migrations of impurity aluminum(Al)and copper(Cu)in purification of rare earth metal by solid-state electrotransport(SSE),there are still some questions about that which direction they migrate to and whether there are significant migrations or *** metal lanthanum(La)was used as research object,and the effects of migration temperature and time on the distributions and migration regularities of impurity Al and Cu were investigated in the present study by increasing concentration of impurity Al and Cu in raw metal *** impurity migration direction and removal difficulty were intuitively judged by the residual rate distribution curve of *** is indicated that metal impurity Al and Cu in metal La at 800℃ with direct current are found to significantly migrate to anode and their residual rates near cathode decrease with the increase in migration temperature and prolongation of migration *** relatively large vapor pressure of Al and Cu makes their residual rate distribution curves being low in middle and high in *** metal La was continuously purified for 100 h at 800℃ by SSE,the residual rates of impurity Al and Cu at 20 mm from cathode are 68.43%and 57.43%,respectively,showing that Cu is much easier to be removed than Al.

关键词： Solid-state electrotransport Purification Residual rate Rare earth metal Lanthanum

Finite-temperature ductility-brittleness and electronic structures of Al_(n)Sc(n=1,2 and 3)

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第8期43卷 3974-3989页

作者： Xue-Qian Wang Ying Zhao Hao-Xuan Liu Shu-Chen Sun Hong-Bo Yang jia-min zhong Gan-Feng Tu Song Li Yu-Dong Zhang Claude Esling Hai-Le Yan Liang Zuo Key Laboratory for Anisotropy and Texture of Materials(ministry of Education) School of Material Science and EngineeringNortheastern UniversityShenyang 110819China School of Metallurgy Northeastern UniversityShenyang 110819China Rare Earth Functional Materials(Xiong'an)Innovation Center Co. Ltd.Xiong'an 071700China Laboratoire d'étude des Microstructures et de Mécanique des Matériaux(LEM3) Unikersitéde Lorraine57045MetzFrance

Finite-temperature ductility-brittleness and electronic structures of Al_(3)Sc,Al_(2)Sc and AlSc are studied comparatively by first-principles calculations and ab initio molecular *** show that Al_(3)Sc and Al_(2)Sc are brittle at both ground state and finite temperatures,while AlSc possesses a significantly superior *** ground state,AlSc is ductile from Pugh's and Poisson's criteria,while it is brittle in Pettifor's *** ductility of all Al_(3)Sc,Al_(2)Sc and AISc improves greatly with the elevated ***,the Cauchy pressure of AlSc undergoes a transition from negative to *** T>600 K,AlSc is unequivocally classified as ductile from all criteria *** all compounds,the Al-Al bond originated from s-p and p-p orbital hybridizations,and the Al-Sc bond dominated by p-d covalent hybridization,are the first and second strongest chemical bonds,*** explain the difference in mechanical properties,the mean bond strength(MBS)is introduced in this *** weaker Al-Al bond in AlSc,leading to a smaller MBS,could be the origin of the softer elastic stiffness and superior intrinsic *** longer length of the Al-Al bond in AlSc is responsible for its weaker bond ***,the enhanced metallicity of the Al-Al bond in AlSc would also contribute to its exceptional *** longer length of the Al-Al bond in AISc is responsible for its weaker bond ***,the enhanced metallicity of the Al-Al bond in AlSc would also contribute to its exceptional ductility.

关键词： Al-Sc Target materials Intrinsic ductility Finite-temperature elastic constant First-principles calculation

Thickness and sp3 bond modulation of（Ti/tetrahedral amorphous carbon）_n multilayer coatings

在线全文

学校读者我要写书评

暂无评论

Tungsten 2025年第1期7卷 152-160页

作者： Zhi-Jun Xie jia-Lin Li Ling Gong Xiang-Li zhong Hong-jia Song Jin-Bin Wang National-Provincial Laboratory of Special Function Thin Film Materials School of Materials Science and Engineering Xiangtan University

The durability of wear-resistant tetrahedral amorphous carbon（ta-C） coatings is intimately linked to their thickness and the concentration of *** enhance the lifespan of the coatings,we have prepared a multilayer coating consisting of alternating layers of Ti and ta-C,denoted as（Ti/ta-C）_n,using arc ion plating.A multi-layer structure in conjunction with stage cooling is employed to enhance the thickness and promote *** results indicate that the ID/IGvalue,representing the ratio of the intensity of the D peak to that of the G peak in Raman spectroscopy,decreases from 0.85 when no stage cooling is applied to 0.35 when stage cooling is employed,suggesting an enhancement in the fraction of sp3bonds within the *** obtained（Ti/ta-C）_n multilayer coating without peeling off has a maximum thickness of 1.14 μm,which is almost double that of the ta-C coating single layer *** the same time,the coating has a low coefficient of friction,down to 0.069,and maintains excellent friction properties with a wear rate of 3.4×10-6mm3·N-1·*** results conclusively show that the preparation technology can enhance both thickness and sp3bonding in ta-C coatings,significantly expanding their utility across tools,molds,and precision engineering components.

关键词： Arc ion plating Multilayer structure sp3 bond Ta-C coating Wear resistance

汞矿区周边土壤重金属空间分布特征、污染与生态风险评价

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

环境科学 2021年第6期42卷 3018-3027页

作者：王锐邓海贾中民王佳彬余飞曾琴琴重庆市地质矿产勘查开发局川东南地质大队重庆400038 重庆市土地质量地质调查重点实验室重庆400038 中国地质调查局成都地质调查中心成都610081

为探明汞矿开采对周边土壤环境及人体健康的影响,在重庆市酉阳县某汞矿聚集区周边采集表层土壤组合样42件,分析了土壤中重金属(Cd、Hg、Pb、As、Cr、Cu、Zn和Ni)的含量及p H,对土壤重金属含量的空间分布特征、污染程度和生态风险进行了... 详细信息

为探明汞矿开采对周边土壤环境及人体健康的影响,在重庆市酉阳县某汞矿聚集区周边采集表层土壤组合样42件,分析了土壤中重金属(Cd、Hg、Pb、As、Cr、Cu、Zn和Ni)的含量及p H,对土壤重金属含量的空间分布特征、污染程度和生态风险进行了研究.结果显示,研究区土壤重金属表层富集明显,参照《土壤环境质量农用地土壤污染风险管控标准(试行)》(GB15618-2018)发现,土壤Cd、Hg、Pb、As和Zn存在不同程度的超标现象.土壤存在一定程度的污染和生态风险,土壤重金属中度-重度污染和强生态风险区均分布在矿点周围,说明矿业活动对土壤环境的影响.土壤Cr、Cu和Ni含量可能受到母岩的风化和成土作用的影响,土壤Hg、Pb和Zn可能受到矿产开采等人为活动的影响,土壤Cd和As同时受到地质背景和人为活动的影响.重金属对成人的健康影响较小,对儿童造成健康风险的概率较大,土壤As是造成人体健康风险的主要贡献因子,8种重金属均以经口摄入途径的贡献率最高.汞矿的开采是造成研究区土壤污染及生态风险的主要原因.

关键词：汞矿区土壤重金属分布特征土壤污染生态风险

Porous Organic Cage‑Based Quasi‑Solid‑State Electrolyte with Cavity‑Induced Anion‑Trapping Effect for Long‑Life Lithium Metal Batteries

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2025年第2期17卷 376-386页

作者： Wei-min Qin zhongliang Li Wen‑Xia Su jia‑min Hu Hanqin Zou Zhixuan Wu Zhiqin Ruan Yue‑Peng Cai Kang Li Qifeng Zheng School of Chemistry South China Normal UniversityGuangzhou 510006People’s Republic of China Key Laboratory of Functional Metal‑Organic Compounds of Hunan Province College of Chemistry and Material ScienceHengyang Normal UniversityHengyang 421008People’s Republic of China Guangzhou Key Laboratory of Energy Conversion and Energy Storage Materials Guangzhou 510006People’s Republic of China

Porous organic cages(POCs)with permanent porosity and excellent host–guest property hold great potentials in regulating ion transport behavior,yet their feasibility as solid-state electrolytes has never been testified in a practical ***,we design and fabricate a quasi-solid-state electrolyte(QSSE)based on a POC to enable the stable operation of Li-metal batteries(LMBs).Benefiting from the ordered channels and cavity-induced anion-trapping effect of POC,the resulting POC-based QSSE exhibits a high Li+transference number of 0.67 and a high ionic conductivity of 1.25×10^(−4) S cm^(−1) with a low activation energy of 0.17 *** allow for homogeneous Li deposition and highly reversible Li plating/stripping for over 2000 *** a proof of concept,the LMB assembled with POC-based QSSE demonstrates extremely stable cycling performance with 85%capacity retention after 1000 ***,our work demonstrates the practical applicability of POC as SSEs for LMBs and could be extended to other energy-storage systems,such as Na and K batteries.

关键词： Porous organic cage Cavity-induced anion-trapping Quasi-solid-state electrolyte Homogeneous Li+flux Lithium metal battery

典型喀斯特地区土壤-作物系统镉的富集特征与污染评价

在线全文

学校读者我要写书评

暂无评论

环境科学 2021年第2期42卷 941-951页

作者：王锐邓海贾中民严明书周皎董金秀王佳彬余飞重庆市地质矿产勘查开发局川东南地质大队重庆400038 重庆市土地质量地质调查重点实验室重庆400038

为了研究喀斯特地区Cd在表层土壤和农作物中的富集特征及影响因素,为土地安全利用提供理论依据,选择在重庆市黔江区中部采集表层土壤样品360件、深层土壤样品7件、85件水稻样品和73件玉米样品(配套采集根系土样),分析了土壤及农作物中C... 详细信息

为了研究喀斯特地区Cd在表层土壤和农作物中的富集特征及影响因素,为土地安全利用提供理论依据,选择在重庆市黔江区中部采集表层土壤样品360件、深层土壤样品7件、85件水稻样品和73件玉米样品(配套采集根系土样),分析了土壤及农作物中Cd的含量、土壤中TFe2O3、Mn、有机质(C_(org))、Se等含量和土壤pH.基于地统计法分析了表层土壤Cd的空间分布特征及富集原因,并对土壤及农作物进行了安全评价.结果表明,表层土壤Cd空间分布不均匀,且表层富集明显,表层土壤Cd含量受到成土母质和人为活动的控制,表层富集主要受到铁锰氧化物和有机质(C_(org))的影响.土壤Cd以无污染和轻度污染为主,部分区域存在强生态风险,污染区主要位于二叠系地层分布区,土壤Cd污染主要受到地质背景的控制.大宗农作物均存在一定程度的Cd轻微-重度污染,水稻的日均建议消耗量的限值为0.87 kg·d^(-1),玉米为1.53 kg·d^(-1).Cd的生物有效性受到土壤酸碱度和土壤Se含量的影响,酸性条件下Cd生物有效性高,土壤高Se区农作物较安全.建议在水田乡二叠系出露区种植Cd低累积作物,或通过调节土壤酸碱度,控制Cd的污染风险,实现土地安全利用.此外,优先选择在土壤高Se区种植农作物.

关键词：喀斯特地区土壤和农作物镉元素富集特征影响因素安全评价

南川金佛山方竹笋营养安全品质和立地土壤评价

在线全文

学校读者我要写书评

暂无评论

物探与化探 2018年第5期42卷 1089-1094页

作者：鲍丽然贾中民李瑜王佳彬重庆市地质矿产勘查开发局川东南地质大队重庆土地质量地质调查重点实验室重庆400038

为了解南川金佛山方竹笋营养品质、安全品质和生长环境,分析了方竹笋的基本营养成分、矿质元素和重金属含量,评价了立地土壤养分及环境质量等级和土壤富硒、富锗状况。结果表明,南川方竹笋水分、蛋白质、总糖、K、Zn、Cu含量较高,并含... 详细信息

为了解南川金佛山方竹笋营养品质、安全品质和生长环境,分析了方竹笋的基本营养成分、矿质元素和重金属含量,评价了立地土壤养分及环境质量等级和土壤富硒、富锗状况。结果表明,南川方竹笋水分、蛋白质、总糖、K、Zn、Cu含量较高,并含有17种氨基酸,必需氨基酸占39.9%。新鲜方竹笋Se含量为0.006×10^(-6)~0.042×10^(-6),富硒率达73%,属富硒食品;Ge含量为0.0002×10^(-6)~0.0018×10^(-6),Ge含量中等,不属富锗食品。南川方竹笋立地土壤养分丰富,除K、Ca O营养等级为中等外,其余均达较丰富或丰富水平;土壤Se含量较高,为富硒土壤;土壤重金属Cd存在超标现象,但未影响方竹笋安全品质,其余重金属环境质量较好。

关键词：金佛山方竹笋营养成分矿质元素土壤养分

镉胁迫对金丝垂柳幼苗生长及叶绿素荧光特性的影响

在线全文

学校读者我要写书评

暂无评论

广西植物 2011年第4期31卷 490-494页

作者：孙晓灿魏虹田晓锋贾中民三峡库区生态环境教育部重点实验室西南大学生命科学学院重庆400715 广州广雅实验学校广州510176 重庆市地质矿产勘查开发局川东南地质大队重庆400039

采用盆栽试验的方法,研究土壤中不同浓度的镉(0、2、20、80 ***-1)胁迫条件对金丝垂柳幼苗的生长、净光合速率(Pn)、光合色素含量及叶绿素荧光参数(Fv/Fm、ΦPSⅡ和qP)的影响。结果表明:(1)2 ***-1处理组植物的生长、净光合速率及叶绿... 详细信息

采用盆栽试验的方法,研究土壤中不同浓度的镉(0、2、20、80 ***-1)胁迫条件对金丝垂柳幼苗的生长、净光合速率(Pn)、光合色素含量及叶绿素荧光参数(Fv/Fm、ΦPSⅡ和qP)的影响。结果表明:(1)2 ***-1处理组植物的生长、净光合速率及叶绿素荧光参数随着处理时间的增加呈先下降后上升的趋势,说明***-1浓度的镉对金丝垂柳幼苗影响较小。(2)20 ***-1和80 ***-1处理组的生长、净光合速率及叶绿素荧光参数均受到抑制,而且随处理时间的增加而表现地更明显。(3)胁迫40 d时各处理组的光合色素含量与对照相比均无显著变化,处理90 d后,其含量随镉胁迫浓度的升高呈先升高后降低的变化趋势。研究证实金丝垂柳对较低浓度(2 ***-1)的镉胁迫具有良好的耐受性和和光合适应能力。

关键词：镉金丝垂柳光合作用叶绿素荧光