竹材的漂白和上香研究

本文以BI为漂白剂,对竹材的漂白和上香进行了系统研究:提出了漂白和上香溶液的最佳配方与工艺路线;优选出SI为较佳的稳定剂;探讨了影响漂白的各种因素;使用了测试竹材强度和表面状态的新方法。通过大量实验,得出了较为满意的结果。     

Desulfurization metabolite of Rhodococcus erythropolis LSSE8-1 and its related desulfurizational gene fragments

Rhodococcus erythropolis LSSE8-1 is a newly isolated biodesulfurizaion strain from the soil of Chishui gas field, Guizhou Province, China. The analysis of its metabolism product shows that the strain is a kind of biocatalyst able to oxidize dibenzothiophene (DBT) to 2-hydroxydi-phenyl (HBP), and therefore the sulfur in DBT is selectively removed. By using DBTO2 (dibenzothiophene 5,5-dioxide) as substrate, both DBT and HBP are found in the culture,which shows that the reaction from DBT to DBTO2 is reversible in the cell. While using 0.5 mmol/L DBT as control,0.01-0.4 mmol/L DBTO2 shows poisonous effect to the cell,which will explain why there is no DBTO2 accumulation in the process of biodesulfnrization. After treatment by lysozme,the plasmid DNA of the strain is isolated by alkaline method to be used as the template of PCR reaction. Three dsz gene fragments of 1.3, 1.0 and 1.2 kb respectively were amplified.Each fragment is ligate with PGEM-T vector, and cloned into E. coil DH5a. The clone DNA is sequenced and the result shows that dsz related genes are highly conservative. The identities of dszA and dszB with respect to IGTS8 are 100%,and the identity of dszC with that of IGTS8 is 99%.     

铜、金、银表面产生反射光学二次谐波研究

以１．０６μｍ激光为基频光，测量了铜、金薄膜及抛光银片、钢片的反射光学二次谐波随入射光偏振方位角的变化规律．与理论对比拟合，求得了这些情况下样品表面谐波电流的唯象参数值ａ．结果表明，ａ对表面状况极为敏感．     

基质掺杂离子对(Y,Rn)_2O_2S∶Sm~(3 ),Ti~(4 ),Mg~(2 )(Rn=La,Gd,Lu,Ga,Al)红色长余辉材料余辉性能的影响

采用高温固相法制备了基质掺杂的(Y,Rn)_2O_2S∶Sm~(3 ),Ti~(4 ),Mg~(2 )(Rn=La,Gd,Lu,Ga,Al)红色长余辉材料,主峰均为4G5/2→6H7/2跃迁的红橙色光发射,不受基质掺杂的影响.余辉性能测试表明掺杂离子半径对余辉性能具有重要的影响:单掺时,与Y3 半径相近并略小时样品的余辉时间有正增长;双离子共掺时均为小半径的掺杂对余辉性能有显著的提高,其中之一半径较大时即具有负效应.并对可能存在的机理进行了初步探讨.     

基质掺杂离子对(Y,Rn)2O2S:Sm3+,Ti4+,Mg2+(Rn=La,Gd,Lu,Ga,Al)红色长余辉材料余辉性能的影响

采用高温固相法制备了基质掺杂的(Y,Rn)2O2S:Sm3 ,Ti4 ,Mg2 (Rn=La,Gd,Lu,Ga,Al)红色长余辉材料,主峰均为4G5/2→6H7/2跃迁的红橙色光发射,不受基质掺杂的影响.余辉性能测试表明掺杂离子半径对余辉性能具有重要的影响:单掺时,与Y3 半径相近并略小时样品的余辉时间有正增长;双离子共掺时均为小半径的掺杂对余辉性能有显著的提高,其中之一半径较大时即具有负效应.并对可能存在的机理进行了初步探讨.     

新建本科院校大学生成就动机的调查研究

采用成就动机量表对某新建本科院校在校大学生成就动机的现状进行调查,结果发现:新建本科院校大学生的成就动机在性别、学历和家庭来源3个变量上不存在统计学上显著的交互作用;成就动机在性别分类上存在差异;在追求成功动机上男女大学生不存在显著差异;在避免失败动机上,女生显著高于男生;在总成就动机上,大一大二学生显著大于大三学生,其他年级不存在显著差异;专科生成就动机高于本科生。     

Precipitation of rutile needles in garnet from sillimanite-bearing pelitic granulite from the Khondalite Belt,North China Craton

Pelitic granulite from the Khondalite Belt, North China Craton, is composed of garnet, sillimanite, perthite, biotite and quartz. Oriented rutile needles in gar- net are reported for the first time from the granulite. The rutile needles have been identified by optical microscopy and confirmed by in situ Raman spectroscopy, where they show the characteristic bands at 446-448 and 610 cm-1. Because of their very strong shape preferred orientation in 3-4 easily observable directions, these futile needles are interpreted to have formed by precipitation during exhu- mation and cooling following peak metamorphism. The ternary feldspar geothermometer gives a peak metamorphic temperature of ,- 980 ℃ at 10 kbar. The presence of oriented rutile needles in garnet is suggested to be a valuable indicator of ultrahigh-temperature （UHT） metamorphism in the Khondalite Belt and therefore likely in other UHT terrains.     

消能摇摆钢桁架框架结构抗震性能

为研究消能摇摆钢桁架-框架结构的抗震性能,使用OpenSees有限元软件对框架结构、支撑-框架结构、摇摆钢桁架-框架结构、消能摇摆钢桁架-框架结构进行模态分析、静力弹塑性分析和动力弹塑性分析,讨论了4种结构的刚度特征、动力响应及损伤分布.此外,建立4种具有不同柱脚形式和阻尼器类型的对比结构,用以研究柱脚形式和阻尼器类型对于结构抗震性能的影响.研究表明,消能摇摆钢桁架-框架结构具有良好的抗震性能;位移型阻尼器能够提高结构刚度和承载力、减震性能更优越,速度型阻尼器可以降低地震作用;底层框架柱脚采用铰接,可以降低地震作用,并减小底层框架柱的塑性损伤.     

基于似然比的多步多重比较检验(英文)

似然比检验是假设检验中一个重要方法,不少最优检验都是似然比检验.文中对带有对照组的多重比较问题提出了一种新的逐步检验法,该检验法正是建立在似然比检验的基础上的.同原有的方法相比,它既能对带对照组的多重比较问题作出更详细的检验结果,推断出究竟哪些新的处理方法效果真正优于对照组的;而且这种逐步检验法只需要至多k-1次假设检验,而它的热却逼近需要2^k-1次检验的完全检验法的势.