三要素基础上的电力拖动系统过渡建模问题研究

对于现下社会内部工程水平的不断提高，涉及的阶段性电路暂态分析的三要素法结合实际电力拖动系统模型建立以及相关的数据分析，实现整个直流或者交流拖动工序系统下的过渡实践效果，保证必要系统分析质量的大幅度上升，消除实际计算中的琐碎公式堆积，保证整体工程环节作用下的具体数据计算的精准性和实际应用推广的实效意义，满足整个建模工程活动的实际社会效益和经济水平。     

Influence of Different Surface Modifications on the Photovoltaic Performance and Dark Current of Dye-Sensitized Solar Cells

The TiO2 nanoporous film photoelectrode, as a crucial component of dye-sensitized solar cells, has been investigated. The photovoltaic properties and the dark current were studied by two surface modification methods. One was to apply a compact layer between the conductive glass substrate and nanoporous TiO2 film. Another was to produce TiO2 nanoparticles among the microstructure by TICl4 treatment. A suitable concentration and number of times for TICl4 treatment were found in our experiment. The dark current is suppressed by surface modifications, leading to a significant improvement in the solar cells performance. An excessive concentration of TICl4 will produce more surface states and introduce a larger dark current reversely. The dye is also regarded as a source of charge recombination in dark to some extent, due to an amount of surface protonations introduced by the interracial link in the conductive glass substrate/dye interface and dye/TiO2 interface.     

大民屯凹陷成岩作用定量表征及有利区带预测

储层实测孔隙度、普通薄片、铸体薄片和扫描电镜的资料表明,大民屯凹陷新生界储层在纵向上发育三个次生孔隙带。从而在一个普遍低孔渗背景下,形成了孔隙度相对较高的优质储层。优质储层的形成和分布主要受沉积微相和成岩作用的影响与控制。他们形成于河道、泛滥盆地、三角洲平原、三角洲前缘水下分支河道、河口坝席状砂及扇三角洲平原和前缘等相带,目前处于早成岩阶段B期~中成岩阶段A1亚期,发育溶蚀成岩相。该文通过成岩作用定量表征方法,预测了大民屯凹陷成岩阶段和成岩相的横向展布。通过成岩相图和沉积相图的叠合,预测了沙三四亚段优质储层的分布。预测结果表明,优质储层主要发育于凹陷东北部地区。     

Dye-Sensitized Solar Cells Based on ZnO Films

In order to improve the performance of the dye-sensitized solar cells based on ZnO films, ZnO nanoparticles of different sizes were prepared by two methods. Some surfactants were added into the particles to form three types of ZnO pastes. Electrodes of various thickness applied to dye-sensitized solar cell were prepared starting from each of those pastes by the screen-printing method. The performance of dye-sensitized solar cells was optimized via both the selected particle size and film thickness. The reason of the inefficiency was explained by the infrared and ultraviolet- visible absorption spectra.     

中美高校心理危机干预工作之比较与启示

中美高校在心理危机干预工作中共同面临着一系列的挑战,但因中美两国在民族文化背景和心理咨询发展阶段上的不同,两国高校在心理危机干预的认知理念、干预方式、主体责任、工作主动群体等方面存在较大差异。通过解读和分析这些差异背后的原因,从家校合作、专兼职队伍建设、心理自助网络平台开发、全员培训4个方面提出对我国高校心理危机干预工作的有益启示。