排序方式: 共有19条查询结果,搜索用时 46 毫秒
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Effect of amphiphilic molecules upon the chromatic transitions of polymerized 10,12-pentacosadiynoic acid (PCDA) vesicles in aqueous solutions was reported. The colorimetric response of polymerized PCDA vesicles for 1-pentanol is higher than that for ethanol due to more hydrophobic property of 1-pentanol. The colorimetric response of polymerized PCDA vesicles for sodium dodecyl sulfate (SDS) and Triton X-100 is lower than that for cetyltrimethylammonium bromide (CTAB). The strong ability of CTAB to induce chromatic transition of the vesicles is related to the positively charged headgroups of CTAB, which favors approach of CTAB to the negatively charged carboxylate groups at the vesicle surface. The insertion of alkyl chain of CTAB into the hydrophobic domain perturbs the conformation of the conjugated polymer backbone and induces color change of polydiacetylene vesicles. For a series of alkylamine hydrochloric salts, the longer the alkyl chain, the stronger the ability of alkylamine to induce chromatic transition of polydiacetylene vesicles. 相似文献
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Wang Jin-ru 《应用数学和力学(英文版)》1981,2(3):361-364
The two conditions (see[1] p. 58) of the Dirac function are inconsistent in standard analysis.In this paper, the author began by studying the integral of the functions on the nucleon a(o), and then, making use of the point function in infinitesimal analysis to define the Dirac function (x) so that it satisfies the condition (1.2) and δ(X)=o, for X∈R≠0 and X Some various examples of Dirac functions have been presented and some properties of the d function have been derived. 相似文献
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采用LB技术组装了一种三维有序的由十八胺修饰的纳米金颗粒多层结构.这是一种新的组装纳米颗粒三维有序聚集体的方法.为了扩大这种方法的适用范围,在组装过程中,将有机小分子1-苯基-5-巯基四氮唑引进结构,形成了新的纳米金颗粒多层聚集体.这两种多层膜经透射电子显微镜和小角X射线衍射测量证明构成多层膜的单层膜上的纳米金颗粒是有序的,并且颗粒在层与层之间的排列也是有序的. 相似文献
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THE MORTAR ELEMENT METHOD FOR ROTATED Q1 ELEMENT 总被引:5,自引:0,他引:5
Jin-ru Chen 《计算数学(英文版)》2002,(3)
AbstractIn this paper, a mortar element version for rotated Q1 element is proposed. The optimal error estimate is proven for the rotated Q1 mortar element method. 相似文献
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采用浸渍法制备Ag(x)/ZSM-5(x=3、6、9)催化剂。采用XRD、SEM、NH_3-TPD、Py-FTIR、XPS和NO-TPD等手段对催化剂的理化性质进行表征,在常压固定床微型反应器中评价催化剂甲烷选择性催化还原(CH_4-SCR) NO催化性能,考察Ag负载量对Ag(x)/ZSM-5催化剂CH_4-SCR脱硝性能的影响。结果表明,ZSM-5分子筛负载Ag,催化剂的酸性和酸量发生变化,改善了催化剂对NO的吸附脱附性能。随着Ag负载量增加,形成较大的Ag晶粒,有利于甲烷活化,Ag(x)/ZSM-5催化剂CH_4-SCR脱硝活性提高。Ag(9)/ZSM-5催化剂CH_4-SCR脱硝性能较好,在350℃时NO转化率为41.87%。 相似文献
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本文采用经典Claisen酮酯缩合法,合成了一种新型双官能团配体6-对甲基苯甲酰乙酰基-2-吡啶甲酸(H2L),通过红外光谱、核磁共振谱和质谱对其结构进行了表征。以H2L为配体合成了铕的二元配合物和1,10-菲咯啉为第二配体的三元配合物,并通过红外光谱、差热热重分析、荧光光谱对配合物进行了表征及其发光性质研究。结果表明:所有配合物均能发射铕(Ⅲ)的特征光谱,最强发射峰在615nm左右,配体极好地敏化了稀土离子的发光。第二配体的引入使三元配合物的荧光强度明显大于二元配合物的荧光强度。 相似文献
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The paper investigates the h-p version of the infinite element method. An exponential conver gence can be abtained by a small amount of computing work. 相似文献