科尔沁细毛羊脑桥主要神经核团的形态和细胞构筑研究

对５只健康成年科尔沁细毛羊脑桥主要神经核团的形态和细胞构筑进行了研究,结果表明：蜗神经背核长４６ｍｍ,细胞密度１９５０个／ｍｍ３,主要由小型椭圆、梭形和多突起细胞构成,细胞排列无明显区域性;蜗神经腹侧核长４８ｍｍ,细胞密度为３０４１个／ｍｍ３;面神经核长６７ｍｍ,细胞密度８５５个／ｍｍ３;多为大型多极细胞,可分为５个亚核,其中背内侧亚核、外侧亚核、背侧亚核较发达,中间亚核较小     

Preference in flower visits and partitioning in pollen diets of stingless bees in an Asian tropical rain forest

Floral resource partitioning among stingless bees (Trigona, Meliponini, Apidae) in a lowland rain forest in Sarawak, Malaysia, was investigated using tree towers and walkways in a 4-year study that included a general flowering period. We obtained 100 collections of insect visitors to flowers of varying floral location and shape representing 81 plant species. The tendency of 11 species of stingless bees to visit specific flowers with a particular floral location and shape was analyzed by logistic regression analysis. This analysis showed that the proportion of flower visitor collections containing Trigona fuscobalteata and T. melanocephala differed according to floral location. The former was frequently collected at canopy and gap flowers, whereas the latter was most often collected at understory flowers. The analysis also suggested that T. erythrogastra was more rarely collected at shallow flowers than at deep flowers. Analysis of the pollen diets of T. collina, T. fuscobalteata, T. melanocephala, and T. melina revealed that similarity of pollen sources differed among the six permutated pairs of the four species. The lowest mean rank of similarity found was between T. fuscobalteata and T. melanocephala. This result supports the hypothesis that preference in visiting flowers in different locations leads to pollen resource partitioning. Received: May 14, 1997 / Accepted: April 23, 1999     

Feature selection based on distance correlation: a filter algorithm

Feature selection (FS) is one of the most powerful techniques to cope with the curse of dimensionality. In the study, a new filter approach to feature selection based on distance correlation is presented (DCFS, for short), which keeps the model-free advantage without any pre-specified parameters. Our method consists of two steps: hard step (forward selection) and soft step (backward selection). In the hard step, two types of associations, between univariate feature and the classes and between group feature and the classes, are involved to pick out the most relevant features with respect to the target classes. Due to the strict screening condition in the first step, some of the useful features are likely removed. Therefore, in the soft step, a feature-relationship gain (like feature score) based on the distance correlation is introduced, which is concerned with five kinds of associations. We sort the feature gain values and implement the backward selection procedure until the errors stop declining. The simulation results show that our method becomes more competitive on several datasets compared with some of the representative feature selection methods based on several classification models.     

后股权分置时代的投资银行激励机制变革研究

股权分置改革完成后的外部市场环境进一步加剧了投资银行间的市场化竞争,人才竞争尤为重要,而目前国内投资银行激励机制还存在诸多问题,要吸引人才、留住人才,构建长期激励机制势在必行。本文分析了投资银行实施股权激励的可行性和优势所在,并对目前我国投资银行有效推行股权激励的几个关键问题提出的对策进行了阐述。     

金融控股公司利益冲突的防范

金融控股集团属于金融创新的范畴。这一新的经济形式不仅突破了传统的经营理念,而且对既存的监管制度提出了严峻的挑战,如利益冲突及与此相联的风险问题。本文通过分析利益冲突的表现及美英有关防范利益冲突的金融防火墙制度,提出我国的金融防火墙建议。     

德川将军的文化政策

本文试图探索文明遭遇碰撞后,近世日本做出的选择对其近代化所起到的作用,着重分析了德川时期面对强势文明的冲击,五位将军做出的不同选择.他们所实行的文化政策就像分水岭,把日本对西洋文明的态度分成了前后承起的几个阶段.正是这种选择力的成功启动,成为日本完成近代转型的主要动因.     

策略、规则及权力结构一所中学高三教师名单的公布

本文以改革后的苏北的一所县级重点中学为个案,以围绕高三教师名单公布的升级事件为切入点,从组织的微观视角出发,描述在升级事件中的教师在各种情境下如何利用手头的已有资源来展开行动的策略,并在游戏各方的行动中构建出一个特有的组织权力结构。     

劳动合同服务期规则的适用——以海南省某企业招聘信息为切入点

海南省某企业在其招聘广告中要求劳动者承诺终身服务,涉及服务期规则的适用问题。现行《劳动合同法》存在对劳动者过度保护的倾向性,劳动者约束性条款数量较少。而服务期规则作为用人单位长期留用人才的唯一法律依托,存在着可设定服务期的事项范围过窄、违约金条款不具有应有惩罚性的问题。服务期规则的不健全把企业吸引和培育人才的手段引向异端。司法实践中出现了对现行服务期规则进行突破的裁判或未突破现行规则但裁判结果有违诚信原则的情况。针对现状,建议拓宽可设定服务期的事项范围、改进违约金规则使其具有惩罚性来保障企业人力资本投入上的合理利益,同时规定最长服务期限来维护劳动者基本权益,从而最大限度地维持劳资双方利益平衡。     

转型期中国省际经济波动对经济增长的空间溢出效应

本文基于中国31个省市1979-2012年的数据,采用动态空间杜宾模型,实证分析转型期中国省际经济波动对经济增长的空间溢出效应及其形成机制,得出结论如下:经济波动在淘汰本地区低效率投资项目和企业、优化投资结构、从而对本地区经济增长产生正向直接效应的基础上,因受中国地区间激烈竞争和产业同构的影响,会吸引邻近地区的优质资源,对这些地区的投资结构产生不利影响,进而对经济增长产生负向空间溢出效应.并且,从动态视角的检验发现,相比于短期,两种效应在长期的作用更大.本文关于经济波动对经济增长空间溢出效应的研究对于解释中国经济波动与经济增长的关系机理,以及对于区域经济协同发展、加快国内市场一体化相关政策的制定具有重要意义.