基于Canny算子的简化PCNN电力故障区域提取方法

为了较好地实现电力设备红外图像故障区域提取,提出了一种基于Canny算子边界检测的脉冲耦合神经网络(Pulse-coupled Neural Network,PCNN)红外图像区域提取方法.在该方法中,首先以PCNN模型同步点火特性为基础,通过优化原始PCNN模型内在的参数,使得模型迭代过程中将图像转换成为时间点火序列,然后引入Canny边界检测算子并结合区域灰度特性,获取最佳时刻的脉冲输出信息,实现红外图像中热故障区域的有效提取.最后通过真实红外故障图像测试,验证了文中方法的有效性和适用性,同时方便了后续的特征提取与识别.     

亚慢性钐染毒对雄性小鼠精子质量的影响

为探讨稀土元素钐对雄性小鼠精子的毒性作用, 让5组小鼠自由饮用含硝酸钐0, 5, 50, 500, 2000 mg·L-1的溶液3个月后, 观察钐对小鼠精子活力、数量、畸形率及顶体完整率的影响. 结果表明: 各处理组精子活力、数量都有所降低, 其中2000 mg·L-1剂量组与对照组相比, 各指标值均有极显著差异(P《0.01); 50, 500, 2000 mg·L-1剂量组的精子畸形率与对照组相比也具有极显著差异(P《0.01), 且染毒剂量与精子总畸形率呈现出直线变化的剂量对数-效应关系. 因此精子畸形率可作为稀土元素钐作用于雄性生殖系统的标志指标; 各处理组的顶体完整率也均低于对照组. 说明亚慢性钐暴露对小鼠精子具有一定的毒性作用.     

A QSRR Study on the Chromatographic Retention Indices of Hydroxylated Polychlorinated Biphenyls

Hydroxylated Polychlorinated Biphenyls (HO-PCBs) are the metabolite of polychlorinated biphenyls and have drawn much attention because they have hazard on human health and ecosystems. Molecular connectivity index calculation has been performed for 19 HO-PCB compounds. A number of statistically based parameters have been extracted. Linear relationship between chromatographic retention index (RI) and the molecular connectivity index of 15 compounds in the training set has been established by multiple linear regression method. The other 4 HO-PCBs are used as the external test set. The result shows that the parameters can be well used to express the quantitative structure-retention relationship (QSRR) of HO-PCBs. Good stability and predictive ability have been demonstrated by leave-one-out cross-validation and the external test set.     

基于PCNN分层聚类迭代的故障区域自动提取方法

为了在电力设备红外图像中较好地检测故障区域,提出一种基于分层聚类迭代的红外图像故障区域自动提取方法.在该方法中,首先以脉冲耦合神经网络(Pulse-coupled neural network,PCNN)作为红外图像处理核心模型,通过设置PCNN模型内在参数以及引入聚类机理,使得模型在迭代过程中可将整个图像划分成多个具有相似特性的区域.在此基础上,通过计算各个层点火区域均值以及对均值大小进行排序,然后针对灰度值较高的点火区域,结合边界检测算子并利用相似度评价方式对相邻区域进行合并处理,实现红外图像中热故障区域的有效提取.最后对真实红外图像进行测试并对比现有的一些方法,验证文中方法对热故障区域提取的有效性和适用性.     

Investigation of the Substituent Effects on π-Type Pnicogen Bond Interaction

Intermolecular interactions between PH_2Cl and Ar–R(R = H,OH,NH_2,CH_3,Br,Cl,F,CN,NO_2) were calculated by using MP2/aug-cc-p VDZ quantum chemical method.It has been shown from our calculations that the aromatic rings with electron-withdrawing groups represent much weaker binding affinities than those with electron-donating groups.The charge-transfer interaction between PH_2Cl and Ar–R plays an important role in the formation of pnicogen bond complexes,as revealed by NBO analysis.Nevertheless,AIM analysis shows that the nature of the interactions between PH_2Cl and Ar–R is electrostatic,and the interaction energies of the complexes are correlated positively with the electron densities in the bond critical points(BCPs).RDG/ELF graphical analyses were performed to visualize the positions and strengths of the pnicogen bonding,as well as the spatial change of the electron localization upon the formation of complexes.The π-type halogen bond was also calculated,and it has been revealed that the π-type pnicogen bond systems are more stable than the halogen bond ones.     

基于扩展Meanshift电气设备发热故障区域提取方法

在红外电气故障监测中,设备过热故障区通常表现出高亮度等特点,然而现有的提取方法因红外图像固有的低对比度、边界模糊等特点容易引起提取区域范围增大.为此,本文提出了一种基于扩展的均值漂移聚类的红外图像故障过热区域提取方法,引入了基于邻域灰度的权重因子.同时,为了提升聚类效率,摒弃了传统均值漂移算法遍历整个红外图像平面进行迭代聚类的方法,融合了自高向低的聚类阈值分割机制,使得改进的均值漂移算法能快速地将故障区域像素进行聚类,实现红外图像中热故障区域的有效提取.实验结果表明本文区域提取性能优于目前现有的一些方法以及传统均值漂移聚类方法.     

亚慢性钐暴露对小鼠睾丸组织的影响

为了探讨稀土元素钐对雄性小鼠睾丸的毒性作用,让5组小鼠自由饮用含硝酸钐0,5,50,500,2000mg·L-1的溶液3个月后,观察钐对睾丸组织生化指标及组织病理学的影响。结果表明,各处理组睾丸结构遭到不同程度的破坏,尤其是精子和间质细胞大量减少。2000mg·L-1剂量组乳酸脱氢酶(LDH)活力和500,2000mg·L-1剂量组乳酸脱氢酶X(LDH-X)活力均受到明显抑制;50,500,2000mg·L-1剂量组山梨醇脱氢酶(SDH)活力明显下降,而γ-谷氨酰基转移酶(γ-GT)活力不受影响;随钐浓度的增加,Na+K+-ATPase,Mg2+-ATPase活力有“低促高抑”的趋势,Ca2+-ATPase活力则均呈抑制作用。说明亚慢性钐暴露对小鼠生殖性腺具有一定的毒性作用。