147 resultados para 346.096


Relevância:

10.00% 10.00%

Publicador:

Resumo:

The voltammetric behaviour of acetophenetidin(A(1)) aminopyrine(A(2)) acetaminophenol(A(3)) and aminophenol(A(4)) was investigated by linear-sweep, differential-pulse, cyclic voltammetry at a glassy carbon electrode. In a medium of 0.1 mol/L NaOH solution, 4 high sensitivity and resolution anodic peaks were obtained. Their peak potentials are about at 0.68 V, 0.51, 0.22 and - 0.06 V( vs. Ag/AgCl). They can be used for direct determination of A(1), A(2),A(3),A(4) in samples respectively. The method is simple and rapid. The mechanism of the electrode reaction was discussed.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

对乙酰氨基苯乙醚、氨基比林、乙酰氨基苯酚、氨基苯酚等4种有机物在玻碳电极上的伏安行为进行了研究.在0.1mol/L氢氧化钠溶液中得4个灵敏度和分辨率良好的阳极氧化峰,E_p分别为0.68,0.51,0.22,-0.06 V(vs.AgCl/Ag)左右,样品不需分离直接测定.20多种有机生化物质不干扰,方法简便快速.并对电极反应进行了探讨.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

吡喃酮类化合物是抗爱滋病的一类新药, 本文用CoMFA(Comparative Molecular Field Analysis)方法对19个吡喃酮类化合物的三维构效关系进行了研究, 较详细地探讨了分子的重叠方式, 并选用了其他有关的一些最优条件, 得到满意的结果。

Relevância:

10.00% 10.00%

Publicador:

Resumo:

研究了在多官能团单体异氰尿酸三烯丙酯(TAIC)存在下,辐射对PP/BR共混体系的影响,并用SEM,DSC和动态力学性能等技术对其进行了表征。结果显示,辐射引发TAIC参与的界面反应改变了PP/BR的形态结构,增强了两相的界面粘接,改善了相容性,提高了力学性能。

Relevância:

10.00% 10.00%

Publicador:

Resumo:

采用气相色谱/质谱(GC/MS)联用技术对山东泰山产单叶蔓荆子挥发油的化学成分进行了分析,分离出30多个峰,确认了其中28种成分,占总离子流的95%以上,并对挥发油的主要化学成分Δ3-蒈烯,用气相色谱/傅里叶红外光谱(GC/FTIR)法进行了验证。

Relevância:

10.00% 10.00%

Publicador:

Resumo:

ESR和自旅捕捉技术用于研究活体动物犬心肌缺血再灌产生的自由基,PBN从冠状静脉血液中捕捉到了OH自由基,直接地证实了缺血再灌细胞膜损伤的活性氧自由基作用机制;实验还看到一种甾体皂甙药物具有保护心肌细胞.防止自由基损伤的功能.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

新型导电高分子材料的导电性与其结构的关系梁洪泽,宋永贤,丁黎明,綦玉臣,李丽霞,景遐斌,王佛松(中国科学院长春应用化学研究所,长春,130022)自Wright首次报道了聚环氧乙烷(PEO)-碱金属盐(MX)配合物的离子导电性以来,有关各种聚合物固体...

Relevância:

10.00% 10.00%

Publicador:

Resumo:

从测得的竞聚率计算了单体链节在聚[苯乙烯-甲基丙烯酸β(甲基亚硫酰基)乙酯](PSM)中的序列分布。苯乙烯(S)或甲基丙烯酸β(甲基亚硫酰基)乙酯(M)的长序列的概率随着PSM中相应单体含量的增加而增加。对于S和M摩尔分数大致相等的PSM,单体链节的长序列分布函数值相接近。用与此结构相近的PSM合成的稀土金属络合物,其催化活性不佳。在M短序列分布和S长序列分布较高的情况下,络合物的催化活性最好。所得聚丁二烯的微观结构与PSM中单体单元的分布无关。

Relevância:

10.00% 10.00%

Publicador:

Resumo:

Non-steady-state chronoamperometry of ultramicroelectrodes is a powerful method for the study of mass transport in polymer films. This method has many advantages over the conventional methods at a macroelectrode and the steady state method at an ultramicroelectrode, which yield the most information. The apparent diffusion coefficient, D(app), and the concentration of reactant in the film, c(f), can be determined from a single experiment without knowing the thickness of the film. We studied the transport of several species such as Ru(NH3)63+, Ru(bpy)3(2+), NR and MV2+ in Eastman-AQ polymer film coated ultramicroelectrodes by using this method.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

报道了标题化合物([Mn(Ⅲ)OH·H_2O·TMAP]·I_3·Cl·9H_2O)的合成和晶体结构。晶体属P2_(1/a)空间群,a=1.8502(1)nm,b=1.2738(1)nm,c=3.0458(2)nm,β=104.52(4)°,Z=4,R=0.096,R_w=0.087.用顺磁和光谱电化学证明卟啉配合物中心锰为三价,确定了锰卟啉轴向两个配位氧原子,一个属水分子,另一个属氢氧根。讨论了锰卟啉的稳定氧化态。

Relevância:

10.00% 10.00%

Publicador:

Resumo:

介绍了p-n结电容测量方法。通过测量C-V特性研究了Cds太阳电池的热处理及上栅过程,分析并讨论了p-n结的变化与电池不稳定的关系。初步研究了扩散电位的测定问题。

Relevância:

10.00% 10.00%

Publicador:

Resumo:

本文提出了用电感耦合等离子体原子发射光谱(ICP—AES)法直接测定混合稀土铜合金中13个非稀土和稀土元素。选用了合适的分析线对及ICP光源的工作参数。探讨了观察高度、功率、酸度、载气和基体量的变化对被测元素谱线强度的影响。不用化学分离,可一次同时测定La、Ce、pr、Nd、Sm、Sn、Zn、Fe、Al、Ni、Pb,Mg和Mn。测定范围(%):La_2O_3:0.096~6.4;CeO_2:0.24~16;Pr_6O_(11):0.0384~2.56;Nd_2O_3:0.096~6.4;Sn:0.096~3.2;Mg、Mn、Fe,Sm_2O_3:0.024~1.6;Zn:0.396~6.7;Pb:0.092~6.4;Ni:0.096~3.2;Al:0.0384~1.28。相对标准偏差±3.0~9.1%;回收率85~116%满足冶炼上的要求,得到了满意的结果。

Relevância:

10.00% 10.00%

Publicador:

Resumo:

用X射线光电子能谱(XPS)和二次离子质谱仪(SIMS)等表面分析方法对稀土-6063铝合金进行了研究,发现稀土铝合金的表面为金属铝和铝的氧化物两种形态。稀土及镁两者的协同作用,可以缓和铝合金的氧化程度。SIMS结果表明,加入适量稀土,可以抑制镁在稀土-6063铝合金的表面偏析作用。