大孔吸附树脂提取刺五加(Acanthopanax senticosus)丁香苷

大孔吸附树脂提取刺五加(Acanthopanax senticosus)丁香苷;HPLC     

粘弹性变化对聚对苯二甲酸丁二酯/聚苯乙烯共混物分散相尺寸的影响

粘弹性变化对聚对苯二甲酸丁二酯／聚苯乙烯共混物分散相尺寸的影响曾继军何嘉松沈蓓（中国科学院化学研究所工程塑料国家重点实验室北京１０００８０）关键词共混物，粘弹性，凝聚效应近五年来，不相容聚合物共混物（ＩＰＢ）形态形成的具体过程引起了人们的关注．...     

添加贵金属的Ni/α-Al2O3催化剂甲烷部分氧化制合成气的研究

甲烷部分氧化制合成气因其高空速、高转化率、低H2/CO比而引起人们的重视[1～5].本文研究了在Ni/α-Al2O3催化剂中添加的Rh、Ru、Pt和Pd等贵金属在甲烷部分氧化制合成气反应中的催化作用,重点研究了添加Pt对Ni/α-Al2O3催化剂反应性能的影响.     

离子交换剂的制备及其性能的测定Ⅱ.——一种聚苯乙烯膦酸树脂

苯乙烯-苯二乙烯共聚体在三氯化铝存在下,与三氯化磷起反应,随以硝酸氧化之,制成交换量与直径(由0.15—0.75毫米)不同的膦酸阳离子交换树脂。交换量,膨胀度与水分,因苯二乙烯与树脂直径的递增而减少。从磷含量的实验值与交换量测定的结果,知道每苯环上约含0.76—0.85％原子的磷,且大部分成五价膦酸存在。电位滴定曲线证明这些树脂为二元酸。     

硬弹性聚丙烯纤维分子链的取向特征

硬弹性聚丙烯是在应变结晶和热结晶两个复合过程中形成的。利用双折射并结合广角X射线衍射（WAXD）等方法，研究了硬弹性聚丙烯在制备过程中晶相及非晶相分子链取向的变化，讨论了分了链的取向与硬弹性的关系。结果发现：降低熔体温度或提高熔体拉伸比可以提高晶相及非晶相分子链的取向，热处理时，晶相分子链的取向程度有所提高，而非晶相分子链的取向程度有所下降。在所研究的热处理温度的范围内，硬弹性聚丙烯的弹性回复率越高，晶相分子链的取向程度越高。     

生物毒素的分析

生物毒素是一类具有重要军事和生物医学应用价值的生物源化学物质。许多生物毒素可以作为临床药物或导向药物而受到广泛研究，另外又由于其具有极高的毒性，已成为重要的潜在性生化战剂，受到世界各国军事学家的关注。本文着重介绍了蓖麻毒素(Ricin)、相思子毒素(Abrin)、河豚毒素(Tetrodotoxin)、石房蛤毒素(Saxitoxin)、芋螺毒素(Conotoxin)等五种主要生物毒素的分离分析鉴定方法。     

Synthesis and Structure of a Novel Rare Earth Complex: Eu_3(dpa dioxide)_4·(CF_3COO)_5·H_2O

The novel europium complex Eu3(dpa dioxide)4·(CF3COO)5·H2O (dpa dioxide = di-2-pyridylamine N,N'-dioxide) was prepared by the reaction of Eu(CF3CO2)3 with Dpa dioxide in acetonitrile under 95 ℃ and determined by X-ray single-crystal diffraction. The crystal belongs to monoclinic system, space group C2/c with a = 41.632(8), b = 14.662(3), c = 23.300(4) , β = 100.862(5)o, Z = 8, D = 1.775 g/cm3, V = 13968(4) 3, F(000) = 7232, the final R = 0.0464 and wR = 0.1168. In this tri-nuclear complex, each europium(Ⅲ) is nine-coordinated to adopt an unequal sphere geometry.     

影响Cu-Co合成醇催化剂活性因素的研究

C_2—C_5醇的生成主要与钴组分有关,而铜能显著增加钴的活性,且有利于抑制烃的生成。还原形成的金属钴晶体形态因添加铜而发生了改变。XPS方法表明催化剂在活性状态时,铜和钴之间可能存在电子转移。在影响催化剂活性稳定性方面,结构因素有着重要影响。     

Application of Calcite Veins to Study of Newly-activated Faulting

The study of period and chronology of fault activity in major worksites in an area with exposed basement rocks is quite difficult. The authors have applied the combinative techniques of field investigation, microscopic observation and isotopic dating to studying the calcite veins filled in the fault zones in several major engineering regions and got successful results. The following conclusions are reached: (i) The last period of strong activity of fault F8 in the Tianshengqiao Hydropower Station, Nanpan River is 200 ka B. P. , and there has been, no obvious activity since 150 ka. (ii) The last period of strong activity for 5 faults in Shixiali Reservoir, Yangyuan County, Hebei Province is 200-300 ka B. P. , and there has been no obvious activity since 200 ka. The research results provide a sound basis of engineering geology for project designers.