一种自适应的运动目标阴影消除新算法

精确地消除活动阴影对运动目标的影响是智能视频监控的核心任务之一,对此提出了一种基于局部纹理分析的自适应阴影消除新算法。进行了基于高斯混合模型的背景重建,并根据阴影的光学特性进行了阴影区域的预检测,得到疑似阴影区域;提出了一种新的自适应动态纹理分析方法并在此基础上实现了活动阴影的检测与消除。实验结果验证了算法的有效性和实用性。     

PTN网状网拓扑设计动态删枝算法

针对分组传送网(PTN)网状网拓扑的特点,为提高PTN网状网拓扑设计中的计算效率,提出了一种改进的PTN网状网拓扑设计动态删枝算法(SR-DE)。该算法先分析PTN网络资源和业务信息,在对优化网络成本循环中动态改变每次循环中删除冗余链路数量,并对业务进行稳定路由,因此可以减少了网络权值的改变次数,避免对业务重复路由,提高了计算效率。模拟仿真结果表明,该算法有效地提高了设计满足业务需求PTN网状网拓扑的计算效率。     

Matlab与Fortran混合编程之DLL实现方法

简要介绍Matlab和Fortran各自的优缺点,详细阐述Matlab调用Fortran生成的动态链接库实现混合编程的两种方法。以高斯约当列主元素法求逆为例,从计算时间、精度等方面详细比较了同一算法在多种实现方式下的执行情况。计算结果表明：基于动态链接库的混合编程方法能充分利用现有软件包,结合Fortran计算效率高、Matlab矩阵计算及图形处理功能强的优点,符合当前科学工程计算程序设计的发展方向。     

水力冲孔技术在松软低透突出煤层中的应用

针对嘉禾县罗卜安煤矿煤层松软低透气性的现状,选择了水力冲孔增透措施,介绍了水力冲孔增透机理及基本工艺流程,研究了水力冲孔在松软低透突出煤层区域抽放消突措施中的应用效果。研究表明,水力冲孔在松软低透突出煤层区域抽放消突措施中应用效果显著,单孔冲出煤体7t,冲出瓦斯558．3m^3,抽放钻孔等效孔径提高13．38倍,钻孔抽放有效影响半径提高2～3倍,单孔瓦斯预抽浓度提高4～5倍,抽放衰减周期提高3倍以上。     

超高压结合酶法消减南美白对虾蛋白过敏原研究

以南美白对虾为研究对象,提取水溶性虾蛋白,采用超高压法、超高压处理后再用木瓜蛋白酶水解、超高压下直接酶解等方法消减其过敏原蛋白,用间接酶联免疫吸附法检测过敏原消减效果,确定消减过敏原的条件。结果表明：采用超高压法处理,其最佳条件为压力150MPa、温度45℃、保压时间35min,产物抗原抗体反应的OD492nm值为0.1997;高压结合木瓜蛋白酶水解法最佳条件为：350MPa、温度45℃、保压时间20min,产物抗原抗体反应的OD492nm值为0.0492;超高压下直接用木瓜蛋白酶处理,其最佳条件为：压力300MPa、温度45℃、保压时间35min,产物抗原抗体反应的OD492nm值为0.05。由此可见,高压对过敏原蛋白有消减作用,先高压再水解和超高压下直接酶处理对过敏原的消减效果更好。     

超高压结合酶法消减南美白对虾虾肉中的过敏原

以虾肉为原料,研究超高压对酶法消减南美白对虾虾肉过敏原的强化作用。将南美白对虾去头、去尾、去壳、去肠线后用匀浆机匀浆,制成虾肉酱,分别采用超高压法、超高压处理后再用木瓜蛋白酶水解、超高压条件下直接酶解的方法消减其过敏原,用间接酶联免疫吸附法检测过敏原消减效果,确定消减过敏原的条件。结果表明：采用超高压法处理,其最佳条件为：压力200Mpa、温度40℃、保压时间35min,此条件下产物与抗体反应的OD492nm值为0.1986;先超高压处理再用木瓜蛋白酶水解,其水解的最佳条件为：底物质量浓度10g/100mL、温度60℃、酶与底物质量比1:200,此条件下产物与抗体反应的OD492nm值为0.0487;超高压条件下直接用木瓜蛋白酶处理,其最佳条件为：压力300Mpa、温度40℃、保压时间35min,产物与抗体反应的OD492nm值为0.0516。由此可见,超高压处理对南美白对虾过敏原有消减作用,先超高压处理再用木瓜蛋白酶水解和超高压条件下直接酶处理对过敏原的消减效果更好。     

Perceiving others’ personalities: Examining the dimensionality, assumed similarity to the self, and stability of perceiver effects.

In interpersonal perception, “perceiver effects” are tendencies of perceivers to see other people in a particular way. Two studies of naturalistic interactions examined perceiver effects for personality traits: seeing a typical other as sympathetic or quarrelsome, responsible or careless, and so forth. Several basic questions were addressed. First, are perceiver effects organized as a global evaluative halo, or do perceptions of different traits vary in distinct ways? Second, does assumed similarity (as evidenced by self-perceiver correlations) reflect broad evaluative consistency or trait-specific content? Third, are perceiver effects a manifestation of stable beliefs about the generalized other, or do they form in specific contexts as group-specific stereotypes? Findings indicated that perceiver effects were better described by a differentiated, multidimensional structure with both trait-specific content and a higher order global evaluation factor. Assumed similarity was at least partially attributable to trait-specific content, not just to broad evaluative similarity between self and others. Perceiver effects were correlated with gender and attachment style, but in newly formed groups, they became more stable over time, suggesting that they grew dynamically as group stereotypes. Implications for the interpretation of perceiver effects and for research on personality assessment and psychopathology are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

平面四杆机构死点问题探讨及应用

主要以曲柄摇杆机构为例,分析了平面四杆机构死点实质、极限位置、形成死点条件等,为平面四杆机构解决死点问题、利用死点特性提供了理论依据。研究发现机构死点问题可以设法消除,而且存在着一定的应用和发展空间。     

电压互感器铁磁谐振及优化4VT的消谐措施

通过对常用的几种消谐方式的工作原理及消谐效果分析,得出结论,开口角打开的4VT消谐方式是较优的一种消谐措施。     

Compensation of voltage disturbances in distribution systems using single-phase dynamic voltage restorer

In this paper, a new topology is proposed for a single-phase dynamic voltage restorer (DVR) using direct ac/ac converter. This topology does not require dc-link energy storage elements. The proposed topology has a simple structure and can compensate several types of voltage disturbances such as voltage sags, swells, harmonics and flickers. This topology will not face any problem in long time compensation due to the fact that it provides the required energy directly through grid. The proposed topology can be easily extended to n-phase systems such as three-phase based on the same principle of the operation. In n-phase systems, the voltage sags and swells can be properly compensated regardless of the balanced or unbalanced operation. A new control method is also proposed for direct ac/ac converter in the proposed topology. The simulation and experimental results verify the effectiveness of the proposed topology and its control method in voltage restoration.