Now showing items 3874-3893 of 14235

    • G2(+)(M) Study on N-Alkylamino Cation Affinities of Neutral Main-Group Element Hydrides: Trends Across the Periodic Table 

      Geng, Song; Wu, Ding-Lu; Yang, Jing; Wei, Xi-Guang; Zhu, Jun; Zhang, Hai-Bo; Ren, Yi; Lau, Kai-Chung; 朱军 (AMER CHEMICAL SOC, 2014-05-08)
      We have made an extensive theoretical exploration of gas-phase N-alkylamino cation affinities (NAAMCA), including amino cation affinities (AMCA) and N-dimethylamino cation affinities (NDMAMCA), of neutral main-group element ...
    • G2(+)M study on N -alkylamino cation affinities of neutral main-group element hydrides: Trends across the periodic table 

      Geng, Song; Wu, Ding-Lu; Yang, Jing; Wei, Xi-Guang; Zhu, Jun; Zhang, Hai-Bo; Ren, Yi; Lau, Kai-Chung; 杨静; 朱军 (AMER CHEMICAL SOC, 2014 May 8)
      We have made an extensive theoretical exploration of gas-phase N-alkylamino cation affinities (NAAMCA), including amino cation affinities (AMCA) and N-dimethylamino cation affinities (NDMAMCA), of neutral main-group element ...
    • GaAs红外发光管芯片的表面性质 

      林秀华 (1999)
      利用扫描电子显微镜观察 gA AS 外延层及 I r l E d 芯片的表面,测量了输出辐射强度随芯片表面不同形貌的变化,讨论了 gA AS 红外发光二极管外延及芯片工艺对器件光学、电学性质的影响. 结果显示,芯片表面玷污、划伤,电极磨损,使输出辐射强度降低.
    • Gadolinium embedded iron oxide nanoclusters as T-1-T-2 dual-modal MRI-visible vectors for safe and efficient siRNA delivery 

      Wang, Xiaoyong; Zhou, Zijian; Wang, Zhiyong; Xue, Yunxin; Zeng, Yun; Gao, Jinhao; Zhu, Lei; Zhang, Xianzhong; Liu, Gang; Chen, Xiaoyuan; 高锦豪; 张现忠; 刘刚; 陈小元 (ROYAL SOC CHEMISTRY, 2013)
      This report illustrates a new strategy of designing a T-1-T-2 dual-modal magnetic resonance imaging (MRI)-visible vector for siRNA delivery and MRI. Hydrophobic gadolinium embedded iron oxide (GdIO) nanocrystals are ...
    • Gadolinium embedded iron oxide nanoclusters as T1-T2 dual-modal MRI-visible vectors for safe and efficient siRNA delivery 

      Wang, Xiaoyong; Zhou, Ziji; Wang, Zhiyong; Xue, Yunxin; Zeng, Yun; Gao, Jinha; Zhu, Lei; Zhang, Xianzhong; Liu, Gan; Chen, Xiaoyuan; 高锦豪; 刘刚; 陈小元 (Royal Society of Chemistry, 2013-09-07)
      This report illustrates a new strategy of designing a T1-T 2 dual-modal magnetic resonance imaging (MRI)-visible vector for siRNA delivery and MRI. Hydrophobic gadolinium embedded iron oxide (GdIO) nanocrystals are ...
    • GaN基LED与Si键合技术的研究 

      阮育娇; 张小英; 陈松岩; 李成; 赖虹凯; 汤丁亮 (2010)
      采用金属键合技术结合激光剥离技术将gAn基lEd从蓝宝石衬底成功转移到SI衬底上。利用X射线光电子谱(XPS)研究不同阻挡层对Au向gAn扩散所起的阻挡作用,确定键合所需的金属过渡层。利用多层金属过渡层,在真空、温度400℃和加压300 n下实现gAn基lEd和SI的键合,通过激光剥离技术将蓝宝石衬底从键合结构上剥离下来,形成gAn基lEd/金属层/SI结构。用金相显微镜及原子力显微镜(AfM)观察结构的表面形貌,测得表面粗糙度(rMS)为12.1 ...
    • GAP质控下栽培丹参重金属内控标准物的制备和表征 

      黄志勇; 庄峙厦; 王小如; Frank S CLee (2003-09-25)
      目的 :用GAP质控下栽培的中药丹参作为重金属内控标准物 ,研究其制备和表征方法。方法 :采用四川中江GAP栽培条件下的丹参制备标准物 ,经浓硝酸 过氧化氢微波消解体系处理后用ICP MS测量其重金属含量 ,方法准确、可靠。结果 :用国家一级标准参考物质检验测量方法的准确性和精密度 ,回收率大部分在 90 %~110 % ,精密度小于 5%。结论 :经过不同实验室测试和不同时期稳定性测试的实验结果表明 ,丹参内控标准重金属含量的数据准确可靠 ...
    • Garden-like perovskite superstructures with enhanced photocatalytic activity 

      Ye, Meidan; Wang, Mengye; Zheng, Dajiang; Zhang, Nan; Lin, Changjian; Lin, Zhiqun; 林昌健 (ROYAL SOC CHEMISTRY, 2014)
      By subjecting amorphous flower-like TiO2 to a facile hydrothermal synthesis in the presence of Sr2+, garden-like perovskite SrTiO3 superstructures were achieved. The amorphous TiO2 was preformed using ZnO flowers as ...
    • Gary Hieftje turns 70 

      Slavin, Walter; Slavin, Sabina; Harrison, Willard W.; Winefordner, James D.; Huang, Benli; Horlick, Gary; Ray, Steven J.; 黄本立 (2012-10)
    • Gas phase reactions of HONO with NO2, O-3, and HCl: Ab initio and TST study 

      Lu, X; 吕鑫; Park, J; Lin, MC (AMER CHEMICAL SOC, 2000-08-25)
      Gas-phase reactions of HONO with species of atmospheric interest, NO2, O-3, and HCl, have been investigated by means of ab initio molecular-orbital and transition-state theory calculations. For the HONO + NO2 reaction, the ...
    • Gas-phase hydroxylation of chlorobenzene over Cu-HZSM-5 and catalyst deactivation 

      Chen Lingjing; 陈灵晶; Lin Haiqiang; 林海强; Yan Bin; 严斌; Yang Lefu; 杨乐夫 (SCIENCE CHINA PRESS, 2007)
      Catalytic performance and deactivation of the Cu-HZSM-5 catalyst for gas-phase hydroxylation of chlorobenzene to phenol were studied. Under the conditions of 773 K and water/chlorobenzene volume ratio of 3, a chlorobenzene ...
    • Gas-phase reactions of HONO with HNO and NH3: an ab initio MO/TST study 

      Lu, X; 吕鑫; Musin, RN; Lin, MC (AMER CHEMICAL SOC, 2000-05-03)
      The reduction of MONO by HNO and NH3 has been investigated by means, of ab initio molecular orbital and transition-state theory (TST) calculations. The main reaction channels for the HNO + trans-MONO (cis-HONO) reactions ...
    • Gas-Phase Thermodynamics as a Validation of Computational Catalysis on Surfaces: A Case Study of Fischer-Tropsch Synthesis 

      Zhang, Igor Ying; Xu, Xin; 徐昕 (CHEMPHYSCHEM, 2012-04-23)
      Density functional theory has become a valuable tool to study surface catalysis. However, due to the scarcity of clean and reliable experimental data on surfaces, the theoretical methods employed to explore heterogeneous ...
    • Gating of Redox Currents at Gold Nanoelectrodes via DNA Hybridization 

      Liu, Gang(Chinese Acad Sci, Phys Biol Lab); Sun, Chunfeng; Li, Di(Chinese Acad Sci, Phys Biol Lab); Song, Shiping(Chinese Acad Sci, Phys Biol Lab); Mao, Bingwei; Fan, Chunhai(Chinese Acad Sci, Phys Biol Lab); Tian, Zhongqun; 田中群 (WILEY-V C H VERLAG GMBH, 2010-04)
      DNA immobilized at the surface of cone-shaped gold nanoelectrodes provides a favorable platform for artificial ion channels that can gate the redox reaction of ferricyanide. This effect arises from the nanometer-scale ...
    • GB及ISO中酸碱指示剂法测定食品中总酸的指示剂研究 

      王丽蓉(厦门口岸药品检验所); 黄秀菁 (《分析科学学报》编辑部, 2002-12)
      在实际分析检测工作中 ,发现 GB或 ISO的酸碱滴定指示剂法 ,以酚酞为指示剂无法克服样品底液颜色深或浊度大而干扰终点观察 ,尤其是果汁饮料系列产品色彩缤纷 ,终点观测不方便 ,甚至无法观测 ,实验重现性差 ,严重影响测定结果的准确度与精密度。本文选择百里酚蓝为酸碱滴定指示剂 ,可克服原法缺点与局限。应用于果汁饮料系列产品柠檬酸含量测定 ,结果满意。
    • GC-EI-MS internal standard analysis of phthalic acid esters in fish 

      Tan Jun; 谭君; Lin Zhu-Guang; 林竹光 (SCIENCE CHINA PRESS, 2007)
      The fish samples were cleaned up by Florisil, then analyzed by GC-EI-MS to determine eight phthalic acid esters, diethyl phthalate (DEP), dipropyl phthalate (DPrP), dibutyl phthalate (DBP), butyl benzyl phthalate (BBP), ...
    • GC-EI-MS同时分析食品中的苏丹Ⅰ和苏丹Ⅱ 

      林竹光; 谭君; 陈美瑜; 马玉; 范玉兰; 金珍; 陈招斌; 涂逢樟 (2006-09-30)
      将气相色谱-电子轰击离子源-质谱法(GC-EI-MS)应用于番茄沙司和辣椒酱中苏丹Ⅰ和苏丹Ⅱ添加剂的同时分析,并对两种化合物的EI-MS主要碎片离子的结构与断裂机理进行初步解析.分析方法的线性范围为24—800μg.kg-1,相关系数(R2)均大于0.993,相对标准偏差(RSD)均小于12.7%,样品的加标回收率为77.3%—106%,苏丹Ⅰ的方法检出限(LOQ)为7.8μg.kg-1,苏丹Ⅱ的LOQ为6.8μg.kg-1.
    • GC-FPD双柱法测定海水中的痕量有机磷 

      王凌; 徐晓琴; 殷月芬; 李艳丽 (2007-04-15)
      本文提出了一种GC-FPD测定海水中28种有机磷农药残留的新方法。采用双柱法,即选用DB-1701柱进行定性、定量分析,用HP-5柱验证。既发挥了FPD检测器灵敏、定量准确的优点,又利用了双柱法的定性功能。方法对各目标物均有良好的线性关系,回收率和RSD分别在70.2%~103.2%、8.7%~17.5%之间,适合于海洋水体中痕量有机磷农药的分析。
    • GC-MS fingerprints for discrimination of Ligusticum chuanxiong from Angelica 

      Yang, Baijuan(First Inst Oceanog SOA, QingDao Key Lab Analyt Technol Dev & Standardizat); Chen, Junhui(First Inst Oceanog SOA, QingDao Key Lab Analyt Technol Dev & Standardizat); Lee, Frank Sen-Chun(First Inst Oceanog SOA, QingDao Key Lab Analyt Technol Dev & Standardizat); Wang, Xiaoru; 王小如 (WILEY-V C H VERLAG GMBH, 2008-09)
      A GC-MS fingerprinting technique based on the essential oil components has been developed for the discrimination of chuanxiong against Chinese Angelica (Angelica siueusis (Oliv.) Diels) or other herbs with similar compositions. ...
    • GC-MS法快速测定茶叶中脂肪酸 

      王磊磊; 陈军辉; 王虹; 余卫娟; 殷月芬; 王小如; 杨东方 (2009)
      建立了气相色谱-质谱联用技术(gC-MS)快速分析茶叶脂肪酸的新方法。对23批茶叶样品进行gC-MS分析,结合nIST 05谱库检索鉴定茶叶脂肪酸种类,并用峰面积归一化法测定其相对含量,比较不同加工方式的茶叶脂肪酸含量。结果表明,所有茶样中亚麻酸、亚油酸和棕榈酸含量最高,但绿茶和青茶脂肪酸含量高于发酵处理的红茶和黑茶。方法可以用于分析各种茶叶的脂肪酸,反映不同种类茶叶的性质差异。