Template Synthesis and UV-Vis Absorption Spectra of the Nanowire Arrays of Cadmium Chalcogenides

以多孔氧化铝为模板 ,用交流电分别通过含有相应的CdCl2 、ZnCl2 、单质S、Se等的二甲亚砜 (DMSO)溶液 ,沉积CdS、CdSe以及CdxZn1-xS半导体纳米线阵列并研究其紫外可见吸收光谱 .实验结果表明 ,当半导体纳米线的直径小于 2 5nm时 ,其吸收边相对于体相的吸收边产生蓝移 ,而且蓝移的幅度随着半导体纳米线直径的减小而增加 ,显示了明显的量子限域效应 .XU Shi_min, XUE Kuan_hong , KONG Jing_lin, SUN Dong_mei, FENG Yu_ying, LU Hai_yan (Dept. of Chem., Nanjing Normal Univ., Nanjing 210097, China) WANG Guang_hou (National Laboratory of Solid State Microstructures, Nanjing Univ., Nanjing 210093, China)The porous alumina membrane formed in the anodic oxidation of highly pure aluminum foil has attracted a great deal of attention in recent years [1] . It can be served as a desired template to prepare nanometer scale materials [2] due to its unique structure of discrete and cylindrical nanopores, paralleled one another, with the homogeneous size and distribution [3] . Chalcogenide semiconductors have promising prospect in the applications of photovoltaic [4] and photoconducting devices [5] and have been extensively exploited for many years. Olbright and his co_workers studied experimentally and theoretically the optical nonlinearties of CdS xSe 1-x _doped glass [6] ; Britt and Ferekides reported that the conversion efficiency in a solar cell of thin_film CdS/CdTe could be as high as 15.8% [7] . Here we report the fabrication and UV_Vis absorption spectra of CdS、CdSe and Cd xZn 1-x S nanowire arrays deposited into the template matrix of porous alumina. The diameters of these nanowires were varied from 10 nm to 50 nm in our experiments.作者联系地址：南京师范大学化学系!江苏南京210097,南京师范大学化学系!江苏南京210097,南京师范大学化学系!江苏南京210097,南京师范大学化学系!江苏南京210097,南京师范大学化学系!江苏南京210097,南京师范大学化学系!江苏南京210097,南京大学固体微结构国家重点实验室!江苏南京21009

一种导电涂料

本发明提供了一种导电涂料，其包括：1wt%~8wt%的石墨烯，0.1w%~1wt%的功能化石墨烯，15wt%~30wt%的环氧树脂与固化剂，0.2wt%~1.5wt%的润湿分散剂，0.1wt%~0.5wt%的消泡剂，0~30wt%的导电填料，余量为溶剂；所述功能化石墨烯为含有氨基的功能化石墨烯或含有巯基的功能化石墨烯。由于本发明的功能化石墨烯中带有氨基或巯基，其能更好的分散在体系中，同时氨基或巯基能与环氧树脂中的环氧基团反应，提高涂层的结合力；另一方面，石墨烯不仅具有片状结构且径厚比较大，且在低添加量的条件下其在涂膜中平行排列了很多层，因此导电涂料具有较好的导电性和附着性

一种石墨烯基导电油墨、其制备方法及柔性导电薄膜

本发明提供一种石墨烯基导电油墨，包括：2wt%~25wt%导电组分；5wt%~25wt%粘结剂；0.1wt%~5wt%添加剂；0.1wt%~2wt%pH调节剂，余量为溶剂。其制备方法为：将pH调节剂分散于溶剂中，得到均一的第一混合液；将所述第一混合液与粘结剂混合，得到第二混合液；将所述第二混合液与导电组分和添加剂混合，得到石墨烯基导电油墨。本发明还提供一种由上述导电油墨制备的柔性导电薄膜。本发明的导电油墨分散性好，导电效果好，易于印刷,价格便宜。另外，利用本发明的导电油墨制备的柔性导电薄膜，导电性能好

PCOS患者卵泡基底膜蛋白的免疫组化研究

[目的]探讨多囊卵巢综合征（PCOS）卵巢细胞外基质代谢是否存在异常。[方法]收集PCOS卵巢组织20例作为PCOS组。正常妇女卵巢组织23例作为对照组，用SP免疫组化法比较两组不同期别卵泡基底膜的Ⅳ型胶原、层连接蛋白及串珠样蛋白聚糖3种主要蛋白组分的表达。[结果]两组原始卵泡基底膜3种主要蛋白组分的表达相似；PCOS组初级卵泡基底膜的Ⅳ型胶原、层连接蛋白的表达明显多于对照组（P〈0．05）：PCOS组早期次级卵泡及囊状卵泡基底膜的Ⅳ型胶原、层连接蛋白及串珠样蛋白聚的表达明显多于对照组（P〈0．05）。[结论]PCOS发育中卵泡基底膜的构成成分表达增多，表明PCOS卵巢细胞外基质代谢异常

南海北部海马冷泉碳酸盐岩地球化学组成特征及地质意义

稀土元素和Nd同位素组成是示踪冷泉碳酸盐岩形成环境以及流体来源的重要工具。本研究对采集于南海北部琼东南盆地海马冷泉区两个站点的筒状和含贝壳冷泉碳酸盐岩展开一系列元素和Nd同位素组成研究。筒状冷泉碳酸盐岩和含贝壳冷泉碳酸盐岩的Sr/Ca比值分别为0. 01~0. 02和0. 01~0. 03，而Mg/Ca比值分别为0. 03~0. 09和0. 01~0. 10，指示两种类型的冷泉碳酸盐岩中碳酸盐矿物分别以文石和高镁方解石为主，其中前者指示了较高通量甲烷渗漏和较高沉淀速率的形成环境。两种类型冷泉碳酸盐岩具有相似的稀土元素总量（ΣREE），分别为36. 9×10-6~41. 8×10-6和36. 0×10-6~53. 5×10-6，且均以富集轻稀土元素（LREE）和亏损重稀土元素（HREE）（LREE/HREE分别为11. 2~11. 6和10. 0~11. 4）为特征，二者均无明显的铕异常（δEu分别为1. 03~1. 05和1. 00~1. 03）和铈异常（δCe分别为0. 97~0. 98和0. 92~1. 01），指示其应形成于缺氧环境。筒状冷泉碳酸盐岩和含贝壳冷泉碳酸盐岩均具有相对较低的143Nd/144Nd同位素比值（分别为0. 512066~0. 512096和0. 512059~0. 512087），计算得到εNd值分别为10. 8~10. 6和11. 3~10. 7，且εNd和1/Nd具有明显的负相关性，指示形成两种类型冷泉碳酸盐岩的流体中Nd可能是混合来源，其中绝大部分Nd来源于海水和沉积物的水岩反应释放出的富集143 Nd流体。 Rare earth element (REE) compositions and Nd isotopic signatures are important tools for tracing the formation environments and fluid sources of cold-seep carbonates. This study investigates the elemental and Nd isotopic compositions of tubular and shell-bearing cold-seep carbonates collected from two sites within the Haima cold seep in the Qiongdongnan Basin, northern South China Sea. The Sr/Ca ratios of tubular and shell-bearing carbonates range from 0. 01 to 0. 02 and 0. 01 to 0. 03, respectively, while their Mg/Ca ratios arc 0. 03 to 0. 09 and 0. 01 to 0. 10, respectively. These ratios suggest that the carbonate minerals in shell-bearing carbonates arc primarily aragonite, while those in tubular carbonates are predominantly high-Mg calcite. This difference indicates that shell-bearing carbonates formed under conditions of relatively high methane leakage flux and precipitation rates. Both types of cold-seep carbonates have similar total REE (ΣREE) concentrations, ranging from 36. 9 X 10-6to 41. 8 X 10-6for tubular carbonates and 36.0X10-6to 53. 5X10-6for shell-bearing carbonates. They are characterized by enrichment in light REEs (LREEs) and depletion in heavy REEs (HREEs), with LREE/HREE ratios ranging from 11. 2 to 11. 6 and 10. 0 to 11. 4, respectively. Additionally, both types lack significant Eu anomalies (δEu = 1. 03 ~ 1. 05 and 1. 00 ~ 1. 03, respectively) and Cc anomalies (δCc = 0. 97 ~ 0. 98 and 0. 92~1. 01, respectively), suggesting formation in anoxic environments. Both tubular and shell-bearing cold-seep carbonates exhibit relatively low 143Nd/ 144Nd ratios, ranging from 0.512066 to 0.512096 and 0. 512059 to 0. 512087, respectively. The calculated ϵNdvalues range from - 10. 8 to - 10. 6 for tubular carbonates and - 11. 3 to - 10. 7 for shell-bearing carbonates. A notable negative correlation between ϵNdand 1/Nd suggests that the Nd in the fluids responsible for forming these carbonates is likely derived from mixed sources, with the majority of Nd predominantly originating from 143Nd-enriched water, which was released from the seawater-sediment interaction. © 2024 Geological Society of China. All rights reserved

中科1号羊草在陕西佳县引种试验成功

中科1号羊草(Leymus chinensis "Zhongke No. 1")是由中国科学院植物研究所选育的国审育成品种,该品种市场需求大,种源远远不能满足需求。陕西省佳县是国贫县,根据其土壤气候资源,适合开展羊草种子繁殖,在收获良种的同时,饲草可用于饲喂牲畜,发展草畜加产业链。因此,本文采用三年引种试验数据评价了中科1号羊草品种引种到榆林佳县的适应性。结果表明:该品种田间发芽率56%,保苗率95%以上;第二年越冬率保持在98%以上,完成了从播种到新种子形成的有性生活史。进入生殖期的群体,抽穗率65. 51%,结实率76. 63%,千粒重2. 34g,发芽率76. 29%,种子产量426kg/hm~2;第一茬鲜草和干草产量分别为15 100 kg/hm~2和5 301 kg/hm~2。综上所述,中科1号羊草新品种适宜在佳县及同类地区种植,具有建设我国"黄土高原羊草种子繁殖基地"的巨大潜力,为我国农牧交错带和草原区生态修复提供乡土草种种源

东天山岩浆铜镍硫化物矿床的多期次岩浆侵位与成矿作用——以黄山铜镍矿床为例[J]

位于黄山-镜儿泉镁铁-超镁铁岩带西段的黄山铜镍矿田(包括黄山、黄山东、香山、黄山南矿床),是北疆最重要的镍矿产地。矿田内各岩体都是多期岩浆侵位形成的杂岩体,且黄山东和香山铜镍矿床存在多期成矿作用。本文选取黄山大型隐伏铜镍矿床进行详细解剖,在此基础上探讨东天山地区多期成岩成矿作用及其勘查意义。黄山矿山开采揭露最新地质现象系统观察,不同岩相中橄榄石、辉石(粒径、成分)的垂向和平面剖面变化表明黄山铜镍矿床由多期岩浆侵位形成,且第三期次为主要成矿期。第三期次岩相主要由角闪二辉橄辉岩、角闪方辉橄辉岩和角闪橄榄岩组成。角闪二辉橄辉岩底部的橄榄石核部和边部具有明显的成分差异,其橄榄石的边部相对于核部Fo值和..