微波辐照下（Bi_2O_3）_（0．8）（La_2O_3）_（0．2）固熔体对甲

微波辐照下（Ｂｉ_２Ｏ_３）_（０．８）（Ｌａ_２Ｏ_３）_（０．２）固熔体对甲烷氧化偶联的催化行为陈长林,洪品杰,戴树珊,阚家德（云南大学化学系,昆明,６５００９１）关键词微波,甲烷氧化偶联,（Ｂｉ_２Ｏ_３）_（０．８）（Ｌａ_２Ｏ_３）_（０．２）甲烷氧化...     

动叶尾迹对跨声速压气机静叶非定常分离结构的影响研究

采用数值模拟的方法研究了动叶尾迹对跨声速压气机设计工况下静叶表面和下端壁分离结构的非定常影响规律。首先,采用Rotor37的实验结果验证了数值模拟方法的可靠性。通过对跨声速压气机设计工况的计算,认为定常计算和非定常计算的结果整体上是相似的,非定常计算考虑了动叶尾迹对静叶流场的影响。研究表明,动叶尾迹在向下游输运过程中经历了拉伸、扭曲、积聚和耗散的过程。动叶尾迹使动静叶交界面气流角发生周期性波动。动叶尾迹的扫掠,使静叶前缘闭式分离区域范围发生先增大后减小的周期性波动,使静叶尾缘分离形式呈现由闭式分离向开式分离的周期性转化。动叶尾迹的扫掠在马蹄涡吸力面分支前诱导出一个小尺度的旋涡,并使得静叶根部尾缘和下端壁角区处的螺旋点拓扑结构呈周期性变化。动叶尾迹的扫掠使得静叶压力面的局部高静压区发生周期性的迁移。     

Construction of Tetrathiafulvalene-based Covalent Organic Frameworks for Superior Iodine Capture

The effective capture of radioiodine species during nuclear fuel reprocessing and nuclear accidents is of primary importance but remains challenging for the sustainable development of nuclear energy. Herein, we report two newly designed two-dimensional(2D) and three-dimensional(3D) covalent organic frameworks by introducing tetrathiafulvalene functional groups into the building units for the simultaneous physisorption and chemisorption capture of iodine molecules. Remarkably, the obtained 3D TTF-TAPT-COF material exhibited a superior iodine vapor adsorption capacity of up to 5.02 g/g at 348 K and under ambient pressure and an adsorption kinetics of 0.515 g/(g∙h), surpassing most of other materials reported so far. The strong physiochemical interactions between iodine molecules and the frameworks of the obtained COFs were revealed by a set of experimental techniques. This study provides a feasible approach for the rational design and the construction of novel and effective COF-based adsorbents for iodine enrichment and related environmental remediation.     

Highly sensitive response to dopamine at a modified electrode involving a composite film with Au nanoparticles dispersed in a fluorocarbon polymer

A new approach for the highly sensitive detection of dopamine by a novel composite film involving gold nanoparticles trapped in a negatively-charged fluorocarbon polymer (Nafion) on a glassy carbon (GC) electrode fabricated by a simple method is described. Gold nanoparticles with an average diameter of 2.3 nm ± 0.2 nm are dispersed throughout the whole Nafion film. The introduction of gold nanoparticles into the Nafion film not only gives a highly active electrode surface area but also increases the conduct...     

(S)-4-苄基-2-噁唑烷酮的合成工艺改进

以L-苯丙氨酸为原料,经还原和关环反应合成了(S)-4-苄基-2-噁唑烷酮,总收率66%,其结构经1HNMR,13C NMR和HR-MS表征。     

Expression and Characterization of a Recombinant Truncated Capsid Protein of Hepatitis E Virus in Pichiapastoris

Hepatitis E is an enterically transmitted viral disease caused by infection with hepatitis E virus(HEV).HEV is a nonenveloped virus that has been classified in the family of Caliciviridae.The virus appears to be a polyadenylated,positive-stranded RNA virus with three major open reading frames(ORFs).The capsid protein of HEV is encoded by the open reading frame 2(ORF2).We attempted to produce a truncated capsid protein,designed p293,in Pichia pastoris.The p293 gene encoding amino acids(aa) 382-674 of HEV ORF2 was designed based on the full length of HEV ORF2,cloned into the yeast vector pPIC9K,and expressed in P.pastoris strain GS115.SDS-PAGE and Western blotting demonstrated that the recombinant protein p293 could well be expressed in P.pastoris.Under optimized conditions (culture medium pH,6.0―6.5;methanol concentration added daily,3.0%;inoculum density,OD600=60;induction time point,72―96h),the yield of soluble p293 was approximately 80 mg/L.We also observed p293 secretory expressed in P.pastoris to be 30 nm viral like particles by using electron microscopy.These results show that the p293 may has utility in the analysis of cell specific factors in the protein processing and assembly of HEV,and serve as a useful antigen for both diagnostic and vaccine purposes.     

9-（4，5-二硫甲基-1，3-二硫杂环戊烯-2甲叉基）蒽-10（9H）-酮的合成及量子化学计算

设计合成了一种新的具有D-π-A结构的有机分子，9-（4，5-二硫甲基-1，3- 二硫杂环戊烯-2-甲叉基）蒽-10（9H）-酮（C_(19)H_(14)OS_4）。以~1H NMR， FTIR，元素分析和UV-vis进行了表征。运用Gaussian 98量子化学程序包，采用 B3LYP密度泛函（DFT）的方法，在6-31G（d）水平上对分子的几何构型进行了优化 ，在优化的基础上用TDDFT的方法计算了化合物的电了防染印花谱，计算值与实验 值基本吻合，用TDHF的方法计算了它的二阶非线性光学系数，与蒽醌相比，其第一 超给化率β较大，为12.03 * 10~(-30)esu。     

BeQ2衍生物中金属配体间相互作用对前线分子轨道和非线性光学性质影响的理论研究

采用从头算HF及密度泛函理论(DFT)B3LYP方法对8-羟基喹啉铍(BeQ2)及其取代衍生物Be(MQ)2,Be(CNQ)2的稳定结构及结合能进行计算.在此基础上,系统分析了前线分子轨道组成及体系非线性光学系数的变化.计算结果表明,金属-配体间的相互作用使非线性光学系数增大,且γ比β增大得多;CH3和CN的推拉电子取代均使结合能降低,电子离域性增强,非线性光学性质得以改善.     

镁铝铬质耐火材料的X射线荧光光谱分析

将XRFS法应用于Mg-Al-Cr耐火材料中10元素（包括主成分及微量组分）的同时测定。对分解试样的熔剂作了系统研究,发现以1：1混合的四硼酸锂和偏硼酸锂具有最佳熔融效果,所得熔块光滑透明而均匀。选定的熔融温度和时间为1150℃和15min。试样和熔剂的质量比以1：8为好,所得试样在熔剂中的分散度（浓度）适当,可同时适合试样中高、低含量组分的测定,采用熔融法分解试样的方法有效地消除了试样的粒度效应。对仪器工作条件（包括X-光管的电流及电压、分光晶体的选用等）进行了试验并选定最佳条件,使各元素测定所要求的灵敏度和准确度得到满足。此外,采用理论α系数校正法克服了基体吸收及增强效应。用4个标准样品按所提出的方法进行分析,以考核方法的精密度和准确度。10元素的测定结果与其标准值完全相符。     

低分子烃类对吐温80-盐-水液-固析相分离的影响

报导了环己烷、庚烷等的加溶对非离子表面活性剂（吐温－80）液－固析相分离的影响,使小分子显色剂对甲酰基偶氮变色酸（CApF)、偶氮胂1（ArsenazoI)和配合物在低温下就易从盐水溶液相富集到表面活性剂固相,萃取率达95％。并对不己烷、庚烃的加溶机理及温度的作用做了探讨。