109 resultados para OXOVANADIUM(IV)


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Lian-Xiang U, Jian-Guo Wang and Wu-Han Xiao (2002) Taxonomic studies of parasitic nyctotherans from Chinese Anura amphibians IV. Spirocytopharynxa gen. nov. and Macrocytopharynxa gen. nov. Zoological Studies 41(1): 77-84. This paper describes 2 new genera and 5 new species of nyctotherans from Anura amphibians distributed in southern China. Based on the composition of the upper and bottom flaps, the number and position of sutural lines, the length of the oral groove, and the morphology and position of the end of the cytopharynx, the adoral zone of the membranelle (AZM), and the macronucleus, two new genera were established. The 3 new species, Spirocytopharynxa sinensis, S. guangxiensis, and S. quadranus, belong to the new genus Spirocytopharynxa, Another 2 species, Macrocytopharynxa (Nyctotheroidae Nie, 1932) pyriformis n. comb. and M. lingchuanensis n. sp., belong to the new genus Macrocytopharynxa. The characteristics for diagnosis of the 2 new genera and 5 new species are described in this paper.

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Using an all-electron band structure approach, we have systematically calculated the natural band offsets between all group IV, III-V, and II-VI semiconductor compounds, taking into account the deformation potential of the core states. This revised approach removes assumptions regarding the reference level volume deformation and offers a more reliable prediction of the "natural" unstrained offsets. Comparison is made to experimental work, where a noticeable improvement is found compared to previous methodologies.

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于G批量导入至Hzhangdi

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于G批量导入至Hzhangdi

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本文对1-辛基-3-甲基咪唑六氟磷酸盐离子液体([C8mim]PF6)在包头稀土矿分离钍以及攀西矿分离铈工艺中的应用作了初步探索。论文首先研究了伯胺N1923溶于离子液体对硫酸体系钍的萃取分离行为,考察了酸度、盐析剂浓度、萃取剂浓度等对N1923/IL萃取钍的影响,并与庚烷体系的萃取规律作了对比。在此基础上对萃取机理进行了探讨,提出了不同于分子溶剂体系的萃取机理,认为N1923/IL在水相有硫酸钠作为盐析剂时对钍的萃取为“胶束增溶”萃取机理。此外,钍对稀土的分离考察结果认为,虽然N1923/IL对钍的萃取效率降低,但在一定条件下钍对稀土仍能保持较高的分离系数。由此本文对N1923/IL应用于钍的分离实践作了初步评估。 论文的另外一部分工作研究了纯[C8mim]PF6及其与2-乙基己基膦酸二(2-乙基己基)酯(DEHEHP)的混合体系对硝酸铈(IV)的萃取性能。研究发现纯[C8mim]PF6本身对硝酸铈(IV)有良好的萃取选择性,机理考察结果认为铈(IV)的萃取是由于Ce4+离子在富硝酸根溶液中形成络阴离子Ce(NO3)62-并与离子液体的阴离子PF6—发生交换的结果。一种新型含铈离子液体[C8mim]2Ce(NO3)6的合成进一步证实了这一机理。反萃考察发现被萃入离子液相的铈(IV)用水可完全反萃,且萃取和反萃过程中因离子交换机理导致的离子液体流失可以通过添加适量离子液体组分的方法予以抑制。此外,本文考察了DEHEHP溶于[C8mim]PF6对于含氟硝酸体系铈(IV)的萃取行为,发现在一定条件下DEHEHP对铈(IV)的萃取能获得与分子溶剂中等同的萃取机理。在此基础上,采用DEHEHP/IL从氟碳铈矿分解液中进行分离铈和氟的研究,获得纯度为99.9%以上的纳米CeF3产品。由此我们提出一个将离子液体应用于攀西氟碳铈矿铈钍稀土分离流程的模型,为离子液体在稀土清洁分离流程中实现溶剂绿色化的目标提供了一个范例。

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首次使用两种新的聚偏氟乙烯中空纤维膜萃取法研究了HEH/EHP体系中钕、钐及铈及Cyanex272体系中镱、铒及钍的膜基萃取及分离。研究了膜材料性能。提出了膜萃取反应与液液萃取相同,且均为一级反应;高料液pH值条件下的H~+优先于NH_4~+的传质规律;氨化萃取剂可降低传质阻力;膜萃取机理为伴有界面反应的扩散控制机理及膜孔径对萃取机理的影响。利用钍的传质速率远大于镱的传质速率的特点,实现动力学竞争分离钍和镱。通过界面反应动力学研究,得到了各组分的反应动力学方程、反应速率常数K及相关组分的分离系数。将氨离子选择电极与流动注射分析相结合,实现了氨离子的自动在线分析。为膜萃取技术的工业化提供有价值的基本参数。

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云南省2006年科技攻关及高新技术发展课题资助2006SG07;  人事部2006年留学人员科研择优经费优秀项目资助。

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分析了序贯数论优化算法(SNTO)用于太阳电池I-V曲线拟合时的不足之处,结合遗传算法中自适应搜索的思想,用自适应搜索算法改进了SNTO算法.该算法的基本过程是