多尺度自卷积方差显著性SAR图像目标检测

针对SAR图像中显著性目标检测问题,提出一种基于多尺度自卷积方差显著性的自适应检测算法.该算法在对SAR图像多尺度自卷积运算基础上,通过计算MSAV得到方差显著图.设计了一种自适应阈值检测器,完成SAR图像中显著性目标的检测.实验结果表明,在复杂背景环境下,所提算法能有效检测出与人类视觉较为一致的显著性目标.

基于方差和显著性特征的超声图像分割方法研究

针对超声图像对比度小导致的影像上相邻灰度差别很小,人眼有时难于区分的问题,提出了一种基于方差和显著性特征的超声图像分割方法。首先提取图像中已知样本像素点的方差和显著性特征;然后利用支持向量机根据提取的样本像素点方差和显著性特征进行样本训练,得到分类模型;最后根据训练模型对整幅图像上的像素点进行分类,实现图像的有效分割。实验结果表明该方法针对超声图像的分割是有效的。

不同浓度福林酚试剂对茶多酚检测结果影响的研究

目的研究市售不同来源和不同浓度的福林试剂对固态速溶茶中茶多酚含量测定结果的影响。方法以4种速溶茶样品为检测对象,使用市售3种不同来源的福林试剂进行测定,并应用统计学方法分析不同来源的福林酚试剂对速溶茶中茶多酚检测结果的影响。结果 4种福林酚试剂检测茶多酚的相对标准偏差(relative standardd eviation,RSD)在0.88%～1.60%之间,具有较高的精密度;不同浓度的福林酚,对检测结果有显著性的差异(P<0.05),不同厂家相同浓度的福林酚试剂,对检测结果没有显著性差异(P>0.05)。结论不同浓度的福林酚,对检测结果有显著性的差异,为确保茶多酚检测结果的准确性和一致性,使用前应对福林酚试剂的浓度进行确认。

Estimation of Design Sea Ice Thickness with Maximum Entropy Distribution by Particle Swarm Optimization Method

The maximum entropy distribution, which consists of various recognized theoretical distributions, is a better curve to estimate the design thickness of sea ice. Method of moment and empirical curve fitting method are common-used parameter estimation methods for maximum entropy distribution. In this study, we propose to use the particle swarm optimization method as a new parameter estimation method for the maximum entropy distribution, which has the advantage to avoid deviation introduced by simplifications made in other methods. We conducted a case study to fit the hindcasted thickness of the sea ice in the Liaodong Bay of Bohai Sea using these three parameter-estimation methods for the maximum entropy distribution. All methods implemented in this study pass the K-S tests at 0.05 significant level. In terms of the average sum of deviation squares, the empirical curve fitting method provides the best fit for the original data, while the method of moment provides the worst. Among all three methods, the particle swarm optimization method predicts the largest thickness of the sea ice for a same return period. As a result, we recommend using the particle swarm optimization method for the maximum entropy distribution for offshore structures mainly influenced by the sea ice in winter, but using the empirical curve fitting method to reduce the cost in the design of temporary and economic buildings.

Radicalizing Arab University Students： A Global Emerging Threat

The purpose of the study was to explore the factors mediating college students＇ radicalization. A sample of 1,116 students was drawn from four different Jordanian universities. The construct validity of the scale was estimated by calculating the correlation between the radicalization items and the negative emotion items. A positive significant relationship was found （0.12, a = 0.000）, a sign of validity of the scale. The scale reliability was also strong and was estimated at 0.90 using Cronbach Alpha. Factor analysis produced five factors explaining 45% of the total variance of radicalization. The first factor labeled ＂political radicalization＂ explained 18.5% of the variance, the second factor ＂religious radicalization＂ explained 12.7%, the third factor ＂violent radicalization＂ explained 6.4% of the variance, the fourth ＂group radicalization＂ accounted for 4%, and the fifth factor ＂social radicalization＂ only accounted for 3% of the total variance. Significant differences in student radicalization were found according to the geographical region of the university （North, Center and South）, F = 14, a = 0.000. However, no significant differences were found in radicalization as it relates to gender, and type of college （i.e., Humanities vs. Pure Sciences）.

不同来源福林试剂对蛋白酶活测定结果的影响

福林试剂是蛋白酶活检测的重要试剂之一。试验室配制福林试剂和市售福林试剂对蛋白酶活检测进行研究,结果表明:试验室配制福林试剂放置30d后与酪氨酸反应的显色液的吸光度值与市售福林试剂在5%水平上没有显著性差异。试验室配制福林试剂的RSD在0.30～1.67之间,市售福林试剂的RSD在0.63～1.49之间,其精密度均较高。试验室配制与市售福林试剂分别与酪氨酸反应,显色液吸收波长趋势一致,最大吸收波长均在736～755nm,没有显著性差异。试验室配制与市售福林试剂分别检测同一种样品时,检测值经方差显著性分析,在p<0.05水平上没有显著性差异。按照GB/T23527-2009法制得的福林试剂性质与市售福林试剂均可用于蛋白酶活检测,结果没有显著性差异。