关于太原城市文化建设的几点思考

文章从构建太原“人通天下”的城市主题文化,打造“晋阳文化”品牌,建设学习型太原三个方面,对太原的城市文化建设做出了分析,并提出了建设的方向和措施。     

鸡内金活性炭对酸碱性染料的吸附

以鸡内金(ECGG)为原料,在氩气保护下,先在450℃下高温炭化,后添加KOH作为活化剂,分别选取800、900、1 000℃作为活化温度,制备出3种类型活性炭(ECGG-800、EGGG-900和EGGG-1000).对3种类型活性炭表征分析,并选取ECGG-900做酸性品红和亚甲基蓝的吸附饱和,进行2种最常用的吸附模型Freundlich和Langmuir的拟合.结果表明,用Freundlich吸附等温线模型能解释鸡内金活性炭对酸性染料的吸附;而对于碱性染料的吸附,则Langmuir吸附等温线模型更有说服力;且该活性炭对酸性品红、亚甲基蓝的吸附量分别可达1.682 g/g和2.045 g/g.随着吸附时间的延长,3种活性炭对染料的去除率也随即增大.鸡内金活性炭对处理酸性和碱性染料效果均佳,是一种具有发展潜力的吸附剂.     

Piosson分布参数的p-值检验

首先给出一个定理揭示Poisson分布与伽马分布的关系,利用充分性原理获得了检验统计量.进一步给出Poisson分布参数的单侧显著性检验p-值的计算方法,并结合实例对所给方法进行演示.     

重组葡萄糖脱氢酶的表达及辅酶再生应用研究

为解决异源表达酮还原酶域EryKR1的重组大肠杆菌Escherichia coli BL21(pET28a-eryKR1)催化环己酮还原时消耗的氢供体NADPH再生的问题,构建了克隆枯草芽孢杆菌葡萄糖脱氢酶基因gdh的重组菌E.coli BL21(pET28a-gdh),其中的gdh基因经Nucleotide BLAST功能分析显示与枯草芽孢杆菌9902的gdh基因序列(登录号为EF626962.1)的一致性达到100%。SDS-PAGE检测显示该重组菌经IPTG诱导后可以高效表达出葡萄糖脱氢酶(GDH),其表达量占全菌可溶性蛋白质的64%。GDH粗酶液的比酶活为137.90U/mg。通过气相色谱检测添加了E.coli BL21(pET28a-gdh)的E.coli BL21(pET28a-eryKR1)环己酮还原反应体系中的环己醇含量,结果显示加入重组GDH的双重组菌耦合反应体系中环己醇的产率为82.21%,是未添加GDH的反应体系对应值的3.23倍,表明重组GDH可以为EryKR1还原环己酮系统解决辅酶再生问题。     

神府煤萃取物组成结构的特征分析

采用苯、甲醇、丙酮、等体积的CS2与丙酮的混合溶剂和四氢呋喃依次萃取神府煤,得到其萃取物E1～E5,并采用钌离子催化氧化法氧化各级萃取物,所得氧化产物经重氮甲烷酯化后再进行GC/MS分析,以产物组成结构的差异来推测各级萃取物组成结构的差异.结果表明,神府煤萃取物所得酯化产物的主要成分是烷酸甲酯和烷二酸二甲酯,推测其萃取物中含有大量的烷基芳烃和α, ω-二芳基烷烃;且随着溶剂极性的增强,其萃取物氧化后的酯化产物中,烷酸甲酯和烷二酸二甲酯的碳链长度呈一定的递增趋势,推测神府煤中长链烷基芳烃和α, ω-二芳基烷烃易溶于极性较强的溶剂;在氧化产物中还检测出19种甾烷酸甲酯、萜烷酸甲酯和霍烷酸甲酯,表明神府煤萃取物中含有与芳环相连的甾烷基、萜烷基和霍烷基结构.     

Survey on nonlinear reconfigurable flight control

An overview on nonlinear reconfigurable flight control approaches that have been demonstrated in flight-test or highfidelity simulation is presented. Various approaches for reconfigurable flight control systems are considered, including nonlinear dynamic inversion, parameter identification and neural network technologies, backstepping and model predictive control approaches. The recent research work, flight tests, and potential strength and weakness of each approach are discussed objectively in order to give readers and researchers some reference. Finally, possible future directions and open problems in this area are addressed.     

Creep behavior and effect factors of a TiAl–Nb alloy at high temperature

The effect of solution treatment on the microstructure and creep properties of forged TiAl-Nb alloys was investigated.The results showed that the microstructure of forged alloy mainly consisted of γ/α₂ lamellar colonies and fine equiaxed recrystallized γ/α₂ grains.During the solution treatment the microstructure of the alloy transformed into a fully lamellar structure due to the lamellar colonies growth by consuming equiaxed grains.Compared with the forged alloy the creep l...     

Sequence and analysis of rice chromosome 4

Rice is the principal food for over half of the population of the world. With its genome size of 430 megabase pairs (Mb), the cultivated rice species Oryza sativa is a model plant for genome research. Here we report the sequence analysis of chromosome 4 of O. sativa, one of the first two rice chromosomes to be sequenced completely. The finished sequence spans 34.6 Mb and represents 97.3% of the chromosome. In addition, we report the longest known sequence for a plant centromere, a completely sequenced contig of 1.16 Mb corresponding to the centromeric region of chromosome 4. We predict 4,658 protein coding genes and 70 transfer RNA genes. A total of 1,681 predicted genes match available unique rice expressed sequence tags. Transposable elements have a pronounced bias towards the euchromatic regions, indicating a close correlation of their distributions to genes along the chromosome. Comparative genome analysis between cultivated rice subspecies shows that there is an overall syntenic relationship between the chromosomes and divergence at the level of single-nucleotide polymorphisms and insertions and deletions. By contrast, there is little conservation in gene order between rice and Arabidopsis.     

沥青路面在半正弦荷载下的力学响应

研究轮胎/路面的接触印迹特征及随机荷载作用特点,采用ABAQUS软件构建路面结构三维有限元模型,对半正弦荷载作用下的沥青路面力学响应进行分析。结果表明,半正弦荷载作用下沥青路面的上面层和中面层出现应力应变集中,应力应变值随路面深度的增加而逐渐减小;沥青路面的竖向、横向及纵向应力最大值均出现在上面层,且竖向应力最大,横向应力次之,纵向应力最小;竖向、横向应变最大值出现在上面层,纵向应变最大值出现在上-中面层,且路面结构内部出现反复的纵向拉-压变形,这很可能是沥青路面轮迹带附近材料产生疲劳损坏的根本原因。另外,荷载作用时间和路面温度对沥青路面应变的影响要大于其对应力的影响,路面温度的升高导致应变增大且延迟了残余应变的恢复时间。     

Deformation and damage behaviors of as-cast TiAl-Nb alloy during creep

By means of creep properties measurement and microstructure observation,the deformation and damage behavior of an as-cast TiAl-Nb alloy during creep at temperature near 750°C were investigated.The results showed that the microstructure of the alloy consisted of lamellarγ/α_2 phase,and the boundaries consisted ofγphase located in between lamellarγ/α_2 phases with different orientations.In the latter stage of creep,the dislocation networks appeared in the interfaces of lamellarγ/α_2 phases due to the coarsening of them,which made the coherent interface transforming into the semi-coherent one for reducing its adhesive strength.The deformation mechanism of the alloy during creep was twinning and dislocations slipping within lamellarγ/α_2 phases.In the later period of creep,significant amount of dislocations plied up in the interfaces of lamellarγ/α_2 phases,which may cause the stress concentration to promote the initiation and propagation of the cracks along the lamellarγ/α_2interfaces perpendicular to the stress axis.Wherein,some cracks on the various cross-sections were connected by tearing edge along the direction of maximum shear stress,up to the creep fracture,which is considered to be the damage and fracture mechanism of alloy during creep at 750°C.