1000 resultados para Bonheur, Alice (1874-19..)


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质谱中的立体化学效应(19)──对映异构的α-苯乙胺光学纯度质谱测定吴忆南,涂亚平,潘远江,陈耀祖(浙江大学化学系,杭州,310027,兰州大学应用有机化学国家重点实验室)崔勐,宋凤瑞,刘淑莹(中国科学院长春应用化学研究所)关键词对映体,光学纯度,质...

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一种新的聚工二烯型表面活性剂LYF经液体聚了二烯磺化方法制备而得,并应用于液膜分离研究之中。发现无论内水相是酸性还是碱性,由该表面活性剂制得的W/O型乳状液在稳定性、溶胀率和破乳诸方面均具有令人满意的综合性能。为深入了解液膜的稳定性,我们测定了处于两种水相间的双分子膜的强度。发现由LYF所形成的双分子膜具有最大的膜强值,优于聚异丁烯型的表面活性剂ECA4360和EM301.

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本文用差示扫描量热(DSC)、热重(TG)和红外光谱法研究了标题配合物(简记为C_9M)的热稳定性和固—固相变.讨论了中心金属离子对热稳定性和相变的影响.发现其热稳定性依C_9Co>C_9Mn>C_9Zn>C_9Cu降低.固—固相变数目、相变温度和相变的有序—无序效应主要取决于中心金属离子的种类。Zn组配合物总相变的无序效应比Cu组高,在高温相为完全无序相。C_9Zn配合物低温相变(285K)主要来源于链间相互作用和堆积态的有序—无序变化.高温相为“链熔化”态.

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由吉林省长春地区采集40例健康成人心肌样品,用荧光分光光度法测定硒,用催化极谱法测定钼,用高频感耦等离子体发射光谱法测定铝、硼、钡、钙、镉、钴、铬、铜、铁、钾、镁、锰、钠、磷、锶、钛和锌的含量。取90%可信限,通过计算确定了健康成人心肌19种元素的正常值范围。

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Ultrafine zeolite Y crystals (ca. 100-200 nm) have been successfully grown on metakaolin microspheres (< 100 mu m) for which good hydrothermal stability was observed; products were characterized by powder X-ray diffraction, scanning electronic microscopy and transmission electronic microscopy.

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2010

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2010

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2010

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Cashman, N. (2009). 'Politics, Passion, Prejudice: Alice Childress's Wedding Band: A Love/Hate Story in Black and White', Journal of American Studies, 43, 3, pp. 407?423 Sponsorship: APRS