三相反应器的气含率与液速分布和数值模拟

研究了一定操作条件下的气液固三相鼓泡床反应器的气含率和液体轴向速度分布,讨论了气、液表观速度对气含率和液体轴向速度分布的影响,比较了三相与两相鼓泡床中气含率和液体轴向速度分布,用拟两相的双流体模型计算了三相鼓泡床中的气含率和液体轴向速度．结果表明,模拟结果与实验结果一致．     

《交换空间》栏目引导新的家装理念浅析

本文通过表述传播学五大要素在《交换空间》栏目中的体现,主要介绍了家装从规划设计到具体实施的整个过程在《交换空间》栏目中的体现,分析了《交换空间》作为一种具体的可实施性强的节目对家庭装饰装修理念新的诠释。     

Hypercolumn-array based image representation and its application to shape-based object detection

Biological and psychological evidence increasingly reveals that high-level geometrical and topological features are the keys to shape-based object recognition in the brain. Attracted by the excellent performance of neural visual systems, we simulate the mechanism of hypercolumns in the mammalian cortical area V1 that selectively responds to oriented bar stimuli. We design an orderly-arranged hypercolumn array to extract and represent linear or near-linear stimuli in an image. Each unit of this array covers stimuli of various orientations in a small area, and multiple units together produce a low-dimensional vector to describe shape. Based on the neighborhood of units in the array, we construct a graph whose node represents a short line segment with a certain position and slope. Therefore, a contour segment in the image can be represented with a route in this graph. The graph converts an image, comprised of typically unstructured raw data, into structured and semantic-enriched data. We search along the routes in the graph and compare them with a shape template for object detection. The graph greatly upgrades the level of image representation, remarkably reduces the load of combinations, significantly improves the efficiency of object searching, and facilitates the intervening of high-level knowledge. This work provides a systematic infrastructure for shape-based object recognition.     

梯形波脉冲筛板萃取柱传质性能

本文以UO_2(NO_3)_2—30％TBP(KO)为实验体系,进行了梯形波脉冲筛板柱传质性能的研究。实验中测量了两组分的两相稳态浓度剖面共13组,以扩散模型为基础,求得了梯形波脉冲柱的“真实”传质单元高度HTU_(ox),分散单元高度HDU及表观传质单元高度HTU_(oxp)。通过对实验结果进行分析,选择出了适于本实验体系的较好的操作条件。     

Numerical analysis of seepage flow characteristic of collapse column under the influence of mining

Based on the importance of fractured rock mass seepage research, in order to analyze seepage flow characteristics of collapse column under the influence of mining, a method by embedding fractured rock mass flow solid coupling relationship into FLAC^3D internal flow models is presented according to fluid–solid coupling theory and strength criterion. A calculation model of numerical analysis was established, and the influences of mining pressure and plastic damage to pore water pressure and seepage vector change rule were studied. The results show that collapse column is the main channel of confined water seepage upward. The impact is not big when the workface is away from the collapse column. But when the workface is nearing a collapse column, there will be a seepage channel on a side near the workface, in which seepage vector and head are comparatively large. With workface pushing through collapse column, the seepage channel transfers to the other side of the column. In addition, when the plastic damage area within the collapse column breaks through, a “pipeline flow” will be formed within the column, and seepage field will change remarkably and the possibility of water bursting will be greater.     

小麦中脱氧雪腐镰刀菌烯醇的测定及方法研究

利用免疫亲和柱对脱氧雪腐镰刀菌烯醇(DON)的特异吸附性,使用高效液相色谱法对样品进行测定.研究了提取方式、样品粒度、样品溶液稳定性、振荡提取时间等因素对检测结果的影响.当标准曲线在0～2.0 μg/mL之间,线性关系良好,相关系数达到0.999 1.检测结果RSD小于8.0％,不同水平的加标回收率处于92.0％～107.4％之间,通过回收率试验和标准物质试验验证了方法的可靠性和准确性.     

异形柱框架结构优化

异形柱框架结构是近年来迅速发展起来的一种很有发展前景的新型结构体系.根据规范的方法对异形柱正截面承载力进行了分析,编写了相应的配筋程序,与PKPM相比较,结果较满意.在优化计算中,优化的目标函数为主体结构的综合造价,优化变量考虑全面,约束条件以现行规范条文为依据,并运用了多级优化的思想使得优化结果能更符合实际工程设计施工的要求,编写了异形柱框架结构多级优化程序.     

矿井井塔的梁柱刚度比对剪力滞后效应的影响

利用大型有限元分析软件ANSYS,结合井塔的实际框筒结构工程进行建模分析,通过矿井井塔在水平荷载作用下的具体性能表现,得出梁柱刚度比对剪力滞后效应有较大的影响。再对梁柱刚度比对剪力滞后效应的现象进行分析,将计算结果与仿真分析的结果进行比较,提出改进方法。     

混杂纤维加固混凝土方柱的轴压性能试验研究

通过对不同加固方式下的钢筋混凝土短柱轴压性能试验,研究了混杂纤维约束混凝土柱的破坏形态及荷载与钢筋、混凝土之间的应变曲线关系,以承载力和延性为指标对比分析了不同混杂方式、混杂体积比的混杂纤维约束混凝土柱的受力性能.试验结果表明:混杂纤维的约束作用可以有效提高柱的承载能力,并使其延性得到显著改善;对于其混杂越均匀和二级拉伸破坏的试件,表现出更好的混杂效果,体现出混杂纤维的优越性.     

毛细柱气相色谱法分析水中甲醇的研究

采用PC-5（固定相为交联5％苯基-95％甲基聚硅氧烷）毛细柱直接进样分析环境（水和空气）中的甲醇,实现甲醇及共存物干扰物质（甲醛、乙醇、丙酮、丙酮、异丙醇）的分离,利用高浓度（分流比5．0）和低浓度（分离比1．0）两个工作曲线对环境中甲醇进行准确测定。