关于弱收敛随机变量单调矩的Fatou-型引理

对于弱收敛随机变量单调矩的收敛性,给出了关于收敛速度的充分条件,它们通常比充要的一致可积条件更加方便;同时把Garcia和Palacios（2001）中定理2．2推广到不一定是渐近正态变量的情形,并且对单调矩给出了一个Fatou-型弱收敛定理。     

论国际法由弱变强的趋势

与国内法相比,国际法是一种弱法,但国际关系与国际法自身的发展使国际法从各个方面表现出由弱变强的趋势。然而,不论国际法如何发展,国际社会的固有特征决定了国际法的运行不可能取得像国内法一样好的效果。     

二十年来我国高校MBO研究综述

对1988～2007年间我国高校MBO的理论和实践研究成果进行了梳理,从目标管理的概念界定以及构成的核心要素、特点、环节、应用的正负效应等方面分析了理论研究和实践研究存在的不足,并指出了进一步研究的方向。     

Product information platform based on STEP

The intemational standard ISO 10303.called STEP.has been used to deal with problems in the ex change of product models and the associated data between difierent computer-aided systems.A platform based on STEP for managing product information is presented.This platform includes three components:a product geometry information model,a product feature model and a product visualization model.An information extracting pattern,in which information is extracted from low level elements to high level ones,is adopted in establishing the product geometry information model.Relative elements lists are created based on the extracted product information.With the traversing of these lists,feature extraction methods are proposed,which take advantage of boundary information in product model and avoid the determination of concavity and convexity of curves.Information correlating to features iS stored in a structure named as feature block and the product visualization model iS founded from it.The feature block is used in the platform for information communication and synchronous update among the three components.     

掺Fe氧化物LiaNi0.9CO0.1Fe0.03O2材料的电化学性能研究

采取液相共沉淀法沉淀出前驱复合氢氧化物,再用高温固相焙烧的方法合成了多元掺杂的氧化物正极材料LiaNi0.9Co0．1Fe0．03O2,用电化学实验方法研究了材料的电化学性能。结果表明：通过预处理后合成的电极材料具有比较好的电化学性能,首次充放电比容量可达到168．9和167．1mAh·g^-1,充放电电流效率可达98．9％。     

企业进行外部研发提升了创新绩效吗?——基于Meta整合及Meta回归分析

基于70篇共146项相互独立的关于企业外部研发与创新绩效关系的实证研究样本,本文运用Meta分析方法探讨了内、外向型外部研发及其各维度与企业创新绩效的关系,结果表明：企业内向型、外向型外部研发对于创新绩效均具有显著的正向影响;内向型外部研发中合作引进(产学研、合资)、购买引进(购买技术、设备或服务)、外包与创新绩效的关系逐步减弱;外向型外部研发中承接外包与创新绩效呈中等强度正相关,但是授权技术与创新绩效相关关系结果不显著。此外,文化因素、中介变量存在情况、创新绩效类型会影响外部研发与创新绩效的关系。     

中国高技术产业区域创新效率的动态演变趋势

目前从区域视角探讨中国高技术产业创新效率动态演变趋势的研究基本为空白。为进一步描述和呈现近10年以来中国高技术产业区域创新效率的演变特征,并分析其隐含的政策启示和管理意义,提出一个较为综合的指标体系和评价方法,并结合2006—2017年的相关统计年鉴,对中国不同区域的高技术产业创新效率的动态演变趋势进行分析和对比研究。实证分析结果显示,近10年以来中国高技术产业创新效率整体呈现出典型的研发和转化不均衡状态,其中转化效率更低。这或许需要引起相关部门的关注,并在“十三五”期间的区域科技政策制定中适当采取针对性的措施。     

客户集中度与研发资本化——沪深A股上市公司的经验证据

选取2012-2016年我国A股上市公司为样本,分别采用Logit、Tobit模型实证分析了客户关系对研发资本化的影响。研究结果表明,基于流动性风险和研发费用的税盾效应,客户集中度与研发资本化概率、比率均显著负相关;而且,客户集中度对研发资本化的抑制作用在竞争性行业以及民营控股、盈余门槛压力较小的公司更加明显。本文的经验证据对于理解客户关系对企业决策的影响,进一步完善研发投资相关政策应用具有一定的理论价值和参考意义。     

The workforce of pioneer plants: The role of worker mobility in the diffusion of industries

Does technology require labour mobility to diffuse? To explore this, we use German social-security data and ask how plants that pioneer an industry in a location – and for which the local labour market offers no experienced workers – assemble their workforces. These pioneers use different recruiting strategies than plants elsewhere: they hire more workers from outside their industry and from outside their region, especially when workers come from closely related industries or are highly skilled. The importance of access to experienced workers is highlighted in the diffusion of industries from western Germany to the post-reunification economy of eastern German. While manufacturing employment declined in most advanced economies, eastern German regions managed to reindustrialise. The pioneers involved in this process relied heavily on expertise from western Germany: while establishing new manufacturing industries in the East, they sourced half of their experienced workers from the West.     

The economic microgeography of diversity and specialization externalities – firm-level evidence from Swedish cities

We employ finely geo-coded firm-level panel data to assess the long-standing question whether agglomeration economies derive from specialization (within-industry), diversity (between-industry) or overall density. Rather than treating the city as a single unit, we focus our analysis on how the inner industry structures of cities influence firm-level productivity. Our results illustrate the co-existence of several externalities that differ in their spatial distribution and attenuation within cities. First, we find robust positive effects of neighborhood-level specialization on TFP as well as a small effect of diversity at the same fine spatial level. These effects are highly localized and dissipate beyond the immediate within-city neighborhood level. Second, we also find that firms benefit from the overall density of the wider city. The results emphasize the relevance of “opening up” cities to study the workings of their inner organization and support the idea that location in a within-city industry cluster in a diversified and dense city boosts productivity.