架空线路的故障判断和处理

对油田地区10kV架空线路的常见故障类型进行分析,并对10kV架空线路的反事故措施进行探讨,以提高10kV架空线路的安全运行水平,提高供电可靠性。     

高校图书馆效益评价实例分析——以浙江工业大学图书馆为例

高校图书馆综合效益评价主要有社会效益和经济效益两大指标。构建了综合评价指标体系,并以浙江工业大学图书馆为例,运用综合效益评价体系和评价方法对该馆的几项综合评价指标进行了测算和分析,给出了提高该馆综合效益的建议。     

An AEE-active polymer containing tetraphenylethene and 9,10-distyrylanthracene moieties with remarkable mechanochromism

A polymer(poly(9,10-anthracenevinylene-alt-4,4'-(9,9-bis(4-(4'-(1,2,2'-triphenylvinyl)phenoxy)butyl)-9Hfluorene-2,7-diyl) dibenzaldehyde), P1) was successfully synthesized through the Wittig-Horner reaction by employing fluorene and 9,10-distyrylanthracene moieties as building blocks for backbone and tetraphenylethenes as pendant groups. Photophysical and thermal properties of the resulting polymeric emitter were fully characterized by ultraviolet-visible(UVVis) absorption and photoluminescence(PL) spectra, thermogravimetric analysis(TGA) and differential scanning calorimetry(DSC). While P1 emits an orange-light centered at 567 nm in dilute tetrahydrofuran(THF) solution, the solid powder of the polymer exhibits strong yellow emission peaked at 541 nm. It is also found that the as-synthesized polymer shows unique property of aggregation-enhanced emission(AEE). In addition, P1 possesses high thermal stability with a decomposition temperature(T_(d,5%)) of 430 °C and high morphological stability with a glass transition temperature(T_g) of 171 °C. Under the stimulus of mechanical force, the emission of P1 can be changed from yellow to red(Δλ_(max)=61 nm), showing a remarkable mechanochromism. The results from XRD analysis suggest that such mechanochromic phenomenonof P1 is probably caused by the destruction of crystalline structure, which leads to the conformational planarization of the distyrylanthracene moieties forming by the polymerization and the increase of molecular conjugation of the backbone.     

西兰花异硫氰酸盐诱导SGC-7901细胞凋亡研究

探讨西兰花中异硫氰酸盐(isothiocyanates, ITCS)诱导人胃腺癌SGC-7901细胞凋亡过程中的作用及其可能机制.不同质量浓度ITCS处理人胃腺癌SGC-7901细胞,通过SRB法、细胞形态学观察、流式细胞仪和激光共聚焦显微镜实验,观察ITCS对SGC-7901细胞的抑制率,对细胞凋亡的影响.ITCS可抑制SGC-7901细胞增殖;细胞出现早期凋亡细胞的形态;0、60、120、240 μg/mL的ITCS作用于SGC-7901细胞48 h后,可见细胞凋亡率分别为(4.3±1.6)%、(9.1±3.8)%、(20.1±4.2)%和(55.4±4.9)%;细胞内的Ca2 浓度升高.ITCS能够促进人胃腺癌SGC-7901细胞的凋亡,其作用机制可能是细胞内Ca2 浓度的升高.     

基于波特“钻石模型”的山西旅游业竞争力分析

基于波特的“钻石模型”,从生产要素、需求状况、相关和辅助产业、旅游企业、政府和机遇6个方面对山西旅游业竞争力进行了分析,指出了目前存在的一些问题。     

基于轮廓的孔洞填充算法

提出一种基于轮廓的孔洞填充算法.该算法首先查找目标区域的外围轮廓并添加标记;然后将目标区域内一点作为种子点,以外围轮廓为界进行区域生长,直至找到目标区域上的所有点;最后消除外围轮廓的标记,并将找到的目标区域上所有点置为前景色.实验结果表明,该算法不仅适用于任意类型的孔洞填充,而且具有很高的填充效率;随着目标区域面积的减...     

2.4 GHz CMOS双平衡混频器的设计

该文设计了工作在2.4GHz基于Gilbert单元为核心的CMOS有源双平衡混频器.为提高变频增益增加了分流源单元.该混频器RF、LO和IF分别为2.40GHz、2.41 GHz和10 MHz.经仿真在2.5 V电压下,取得变频增益(Gc)为11.095dB、噪声系数(NF)为8.836dB、1dB压缩点(P1dB)为-13.6 dBm、三阶输入截止点(ⅡP3)为-3.72 dBm、功耗为13.5 mW的较好结果.该混频器采用TSMC 0.25μm CMOS工艺实现,版图面积(包括pads)为1 mm×1 mm.     

含二羟基二苯酮的系列热致液晶共聚酯的合成和表征──Ⅲ．含4，4＇－二羟基二苯砜结构的共聚酯

hermotropic liquid crystalline copolyesters were synthsized from his(4-hydroxyphenyl) methanone (BHP), tereplithalic acid (TPA), p-hydroxybenzoic acid (PHB) and dihydroxydiphenyl sulfone(DPS). The properties of the copolyesters were characterized by polarized microscope with a hot stage, wide angle X-ray diffraction and differential scanning calorimetry. The results show that the copolyesters containing the BHP exhibit nematic liquid crystallinity.     

高校基本建设管理的探索与实践

讨论了高等学校的基本建设工作是高校工作的重要组成部分，以及严格执行基本建设程序，搞好工程设计、工程管理，建立健全建筑材料采购供应制度，确保工程质量，提高投资效益的重要性。并根据高校管理体制和运行机制改革的不断深入，对高校基建管理改革提出了自我发展、自我约束、自我监督的3个思路。