数量化理论在中国早奥陶世笔石动物地理分布研究中的应用

以中国早奥陶世22个地层分区以及至少出现于2个地层分区的57个笔石属作为定性变量,按照57个笔石属在22个地层分区中的出现情况,建立反应矩阵。根据数量化理论Ⅳ,定义各分区间的亲近度,从而使原始定性变量转化为定量数据,并由此获得22个分区相应于22个点在平面图中的位置。在平面图中,22个点可划分为2个点群,分别代表中国早奥陶世的两大笔石动物群,即华南型笔石动物群和华中型笔石动物群。     

中华大蟾蜍(Bufo bufo gargarizans Contor)早期胚胎发育中RNA的合成

以~3H-尿嘧啶核苷作为RNA合成的标记前身物,用放射自显术研究了中华大蟾蜍早期胚胎发育中RNA合成的速率及其与发育之间的关系。结果表明:从受精卵开始至原肠胚期,RNA的合成活性逐渐增强,神经胚期略有下降;RNA合成速率有明显的动—植物极梯度;在诱导与被诱导部位,RNA合成速率明显高于其它部位.     

强啡肽(DYN)对人胎盘绒毛组织促性腺素分泌的影响

用胎盘绒毛组织体外孵育法(无血清培液)研究了强啡肽对妊娠6～10周人胎盘绒毛组织分泌促性腺素的影响.结果表明,当DYN浓度为10~(-9)mol/L,与对照组相比,有明显的刺激作用(P<0.05);浓度为10~(-10)mol/L,刺激作用最强(p<0.001).DYN可能在胎盘绒毛组织分泌hCG中起重要作用.     

CNN intelligent early warning for apple skin lesion image acquired by infrared video sensors

Video sensors and agricultural IoT ( internet of things) have been widely used in the informa-tionalized orchards.In order to realize intelligent-unattended early warning for disease-pest, this pa-per presents convolutional neural network ( CNN) early warning for apple skin lesion image, which is real-time acquired by infrared video sensor.More specifically, as to skin lesion image, a suite of processing methods is devised to simulate the disturbance of variable orientation and light condition which occurs in orchards.It designs a method to recognize apple pathologic images based on CNN, and formulates a self-adaptive momentum rule to update CNN parameters.For example, a series of experiments are carried out on the recognition of fruit lesion image of apple trees for early warning. The results demonstrate that compared with the shallow learning algorithms and other involved, well-known deep learning methods, the recognition accuracy of the proposal is up to 96.08%, with a fairly quick convergence, and it also presents satisfying smoothness and stableness after conver-gence.In addition, statistics on different benchmark datasets prove that it is fairly effective to other image patterns concerned.     

斯蒂芬·克莱恩的人文主义思想及表现探析

对美国作家斯蒂芬·克莱恩的主要小说进行研究分析,梳理出其作品中不同类型的人文主义思想,并深入挖掘其多元人文主义思想的形成原因,以此反观世纪末西方社会动荡复杂的文化语境.     

Early Pleistocene formation of the asymmetric east-west pattern of upper water structure in the equatorial Pacific Ocean

Surface-and subsurface-dwelling planktonic foraminifera from the upper 43 m of Hole A at the Ocean Drilling Program (ODP) Site 807,which was recovered from the western Pacific warm pool during ODP Leg 130,were analyzed for stable oxygen and carbon isotopes.By comparing these results with data from ODP Site 851 in the eastern equatorial Pacific,this study has reconstructed the paleoceanographic changes in upper ocean waters in the equatorial Pacific since 2.5 Ma.During the period from 1.6-1.4 Ma,the oxygen isotopes of surface and subsurface waters were found to markedly change in the western and eastern equatorial Pacific,further confirming the final formation of the well-defined asymmetric east-west (E-W) pattern at that time.This feature was similar to the zonal temperature gradient (sea surface temperature is higher in the west and lower in the east) and the asymmetric upper water structure (thermocline depth is deeper in the west and shallower in the east) in the modern equatorial Pacific.The zonal gradient change of subsurface water δ18O was greater than that of surface water δ18O,indicating that the formation of the asymmetric E-W pattern in the equatorial Pacific should be much more related to the shoaled thermocline and markedly decreased subsurface water temperature in the eastern equatorial Pacific.Moreover,since ～1.6 Ma,the carbon isotopic differences between surface and subsurface waters clearly decreased in the equatorial Pacific,and their long-term eccentricity periods changed from 400 ka to ～500 ka,reflecting the reorganization of the ocean carbon reservoir.This probably resulted from the deep water reorganization in the Southern Ocean at that time and its enhanced influence on the tropical Pacific (especially subsurface water).Our study demonstrates that the tropical ocean plays an important role in global climate change.     

乡土小说在新世纪的“物化”表现及价值重构——以小说《白岸》为例

在中国现当代文学发展进程中,乡土小说经历了一个从"启蒙"乡土到"物化"乡土的过程。在新世纪,其叙事风格随之呈现出影视化叙事倾向,其女性形象的嬗变,更是引起了新世纪文化价值体系的变迁,凸显出当下文坛的"物化"现实。基于此,在文化冲突中重建理性平衡的文化批判价值体系便有了新的内容和意义。     

混凝土硬化过程中的早期收缩裂缝分析

本文通过理论分析和工程实例,简要阐述了混凝土硬化过程中的早期收缩裂缝的产生原因、裂缝形态,混凝土浇筑过程中的注意事项,该类混凝土裂缝的一般处理方法,以供同行互相学习探讨.     

重庆图书馆珍藏毛泽东传记早期珍本述略

从3个方面介绍了重庆图书馆所藏早期毛泽东传记的主要种类和特征,以期为研究者和收藏者提供参考。