外部知识源化、知识积累与中国工业绿色增长——动态异质门槛效应研究     

侯建  王刚  陈建成 《科研管理》2020,41(3):91-100

针对开放式创新驱动与绿色发展融合下工业绿色增长路径及动力来源多元化特征，基于中国工业2009-2015省际面板数据，通过考虑非期望产出的Super-SBM模型测算环境和能源约束下的工业绿色增长结构，并采用改进的动态门槛回归模型，从地区知识积累视角系统探究外部知识源化路径驱动工业绿色增长机制的知识积累动态门槛效应及其时空异质性。研究表明：中国工业绿色增长整体水平较低，地区异质性显著；总体上，外部知识源化对工业绿色增长起到了正向作用，但其存在显著的知识积累异质门槛特征：知识积累一旦突破了临界规模，外部知识源化路径驱动工业绿色增长的正向效应则呈现减弱，且知识积累门槛时空分布存在较大差异。  相似文献   

外国直接投资对于中国技术创新作用的影响分析   总被引：11，自引：0，他引：11  

薄文广马先标  冼国明 《中国软科学》2005,(11):45-51

本文运用我国29个省、市、自治区从1995到2003年的面板数据定量地评估了外国直接投资对我国技术创新（用专利申请量来表征）作用的影响.结论认为：FDI对于中国的技术创新会发挥积极的影响,但前提是要跨越一定的人力资本门槛;FDI对我国外观设计的专利申请量影响程度最大,而对发明专利申请量影响最小,对实用新型的专利申请量影响次之;另外FDI对中国技术创新的影响也存在着明显的区域性特征,FDI对东部地区专利申请量的影响要强于对中部地区的影响,而FDI对于西部地区的专利申请量几乎没有影响.  相似文献   

Tunable polarization of high numerical-aperture objective with phase plate     

LI Jin-song  GAO Xiu-min  WANG Jian  LI Chen-xia 《重庆大学学报(英文版)》2007,6(2):125-129

The intensity distribution of depolarized field in the focal region of a high numerical-aperture optical system was investigated and found that the depolarization effect is tunable by the plate. The depolarization effect gains with the increase of the inner convergence angle of the phase plate, goes through a dramatic descent when the angle is larger than 30° and begins to come back when the angle reaches a threshold of respectively 60°and 65° for the orthogonal diffractive field and the longitudinal diffractive fields. This reveals two convergence points where the depolarization effect is the strongest and weakest, respectively, suggesting that the pure phase plate can be a promising method for altering depolarization diffractive fields and constructing optical instruments.  相似文献   

MLMS算法的收敛性能和步长的研究     

候维岩  邓记才  汪敏  陈伯时 《上海大学学报(英文版)》2003,7(4):410-413

1　Introduction　Asanimportantadaptivealgorithm ,leastmeansquare (LMS)algorithmiswidelyusedinsignalpro cessingandcommunicationapplications[1,2 ] .Howev er ,itisdifficulttosetaproperstepsizeintheLMSalgorithm .Furthermore ,convergenceofthestandardLMSisslow[3] .Inordertosolvethesetwoproblems ,amodifiedleastmeansquare (MLMS)algorithmhasbeenpresented[4 ] .Intheliterature[4 ,6 ] ,ithasbeenpointedoutthatMLMSconvergeswithoutboundmeetingthereqirementofapproachingunbiasedesti mate .InRef.[5 ]ith…  相似文献   

跆拳道运动员的高原训练初探     

赵振 《长治学院学报》2007,24(2):75-77

跆拳道运动员机体能量代谢水平的高低直接影响运动成绩,为了更好的提高跆拳道运动员身体机能及运动成绩,寻找新的训练方法。文章综述了跆拳道运动的供能特点及高原训练对人体能量代谢的影响。  相似文献   

英语阅读的词汇阈限     

韩刚  耿凤竹 《山东教育学院学报》2007,22(4):102-104

在一定条件下,词汇知识与英语阅读能力密切相关。词汇知识的描述可以从广度和深度两个方面进行,词汇知识的统计要明确词标、基础词、词族和词项四个概念。要形成独立阅读英语原著的能力,词汇知识至少要达到3000词的词汇阈限。超过这个阈限后,母语阅读技能开始向英语阅读大规模迁移;达不到这个阈限,词汇知识不足是制约英语阅读能力的主要因素。  相似文献   

IC多功能污水厌氧实验装置的研制     

解清杰  王秀萍  罗凡  付四立 《实验技术与管理》2006,23(10):47-49

研制了一种用于生活污水或有机工业废水厌氧处理研究的多功能实验装置，该装置可作为IC反应器和UASB反应器分别用于研究在一定的处理效果下的工艺参数的确定、运行参数的确定、颗粒污泥特性研究、三相分离器性能研究、环形布水器性能研究、沼气产率分析等，为学生掌握厌氧污水处理技术提供了坚实的实验基础。  相似文献   

Supervision learning as conceptual threshold crossing: when supervision gets ‘medieval’     

Susan Carter 《高等教育研究与发展》2016,35(6):1139-1152

This article presumes that supervision is a category of teaching, and that we all learn how to teach better. So it enquires into what novice supervisors need to learn. An anonymised digital questionnaire sought data from supervisors [n226] on their experiences of supervision to find out what was difficult, and supervisor interviews across campus [n7] sought to discover whether there were discipline differences among challenges. Findings suggest that supervision is often troublesome, and that lessons learned during supervision are irreversible, taking the learner to a deeper level of understanding, all aspects of threshold concept crossing. However, there was more that led me from threshold concept to conceptual threshold crossing theory: the darker themes of the data suggest that truly troublesome learning is more like that which occurs in early English literature, where threshold crossing is a common motif. Many early English stories show heroes in liminal, threshold spaces, often the forest, where their skills and methods are inadequate for ordeals. The result is their acquisition of what educational jargon might call leadership attributes and emotional intelligence. The title draws on Tarantino's [1994. Pulp fiction [Motion picture]. United States: Miramax Films] ‘getting medieval’ to mean threatening, unpleasant, off the edge of the known. Medieval English stories specialise in challenge: they focus on the doing, being and feeling of hard learning. When ongoing challenge from the unexpected troubles supervisors, it also enables, or forces, the acquisition of new attitudes, skills and attributes. I expand conceptual threshold crossing theory by adding the heuristic model of the medieval threshold crossing motif to interpret troublesome learning. Findings raise further research questions: how might novices avoid danger in the dark forest as they traverse their supervisory path and how can institutions support those who find themselves there.  相似文献   

Video diaries: a tool to investigate sustainability-related learning in threshold spaces     

Jane Roberts 《Environmental Education Research》2011,17(5):675-688

This paper takes as a case study an undergraduate field class from a UK university to rural Uganda. It describes and evaluates the use of video diaries as a tool for investigating the process of transformative learning in the context of education for sustainability. The applicability of threshold concept theory to this learning is investigated. Results show the video diary technique to be much more successful in capturing the development of student learning than written diaries. Despite some practical difficulties, rich data were generated. Analysis demonstrated that learning met three of the five criteria for threshold concepts: the learning was transformative, integrative and troublesome. Further research could test whether the learning in this case study met the threshold concept criterion of irreversibility. Further elaboration of the theoretical relationship between threshold concepts, transformative learning and education for sustainability is also needed. It is concluded that the video diary method is potentially transferable to other educational research contexts and may be particularly suitable for researching learning in threshold spaces.  相似文献   

上市公司技术创新的就业效应——基于高管持股的门槛效应研究     

栾斌  杨俊 《科学学与科学技术管理》2016,(7):148-158

以488家上市公司作为样本研究高管持股影响下企业技术创新的就业效应,实证结果表明:当前中国企业技术创新对就业效应的影响是非线性的,并根据高管持股比例的变化表现出区间效应。不同行业、性质的企业技术创新的就业效应存在差异。其中,国有制造企业技术创新的就业效应表现为破坏效应,随着高管持股比例的增加破坏效应逐渐减弱,其他企业技术创新的就业效应随着高管持股比例的增加表现为先创造后破坏;股权集中度的提升能够提高国有企业的就业水平,却对民营企业的就业产生破坏;股权制衡度对国有企业特别是国有制造企业就业的影响是显著的,但是对民营企业的影响并不显著;两权分离度的提高对国有制造企业的就业产生破坏效应,而在民营制造企业则表现出创造效应。  相似文献