中小企业集群的横向合作与技术创新激励研究   总被引：1，自引：0，他引：1  

李敏  杨建梅  欧瑞秋 《科学学与科学技术管理》2007,28(7):64-68

中小企业集群内的知识和技术外溢会带来集群内模仿行为,挫伤创新企业技术创新的积极性。通过博弈模型研究发现,若将企业间横向合作与技术创新活动策略性地联结起来,就可能形成一种制度安排,能够有效解决企业创新激励不足问题。以义乌小商品制造集群作为案例,验证上述理论模型。  相似文献   

Mapping students' interest in a new domain: Connecting prior knowledge,interest, and self-efficacy with interesting tasks and a lasting desire to reengage     

《Learning and Instruction》2021

How students experience educational environments and the interconnections between their readiness, task experiences and their long-term desire to reengage with course content are critical questions for educators. Research postgraduate students (n = 310) at a research-intensive university in Hong Kong, engaging in a 24-h introductory teaching course, participated in this study. Learner readiness for the course was assessed as prior Domain interest, self-efficacy, and knowledge. Subsequently, students completed four formative assessments, reported their on-task interest in seven strategically chosen tasks and end-of-course Course and Domain interest. Longitudinal-SEM tested interconnections between readiness components, Task, Course and Domain interest. Initial self-efficacy beliefs for teaching predicted early Task interest, while Domain interest was a predictor of Task interest in explicitly practical task experiences. Strong interconnections between Task interest across the study were evident. Individual written and social discussion tasks presented strong contributions to future Course/Domain interest. Implications for theory and practice are discussed.  相似文献   

Microstructure of ferrospheres in fly ashes: SEM, EDX and ESEM analysis     

Qing-feng Xue  Sheng-gao Lu 《浙江大学学报(A卷英文版)》2008,9(11):1595-1600

Ferrospheres in fly ashes from a coal-fired power plant were extracted by a magnetic separation technique and their microstructure was studied by scanning electron microscopy （SEM）, energy dispersive X-ray analysis （EDX） and environmental scanning electron microscopy （ESEM）. Ferrospheres in fly ashes show significant iron enrichment compared to their respective fly ashes. Iron oxides in ferrospheres mainly occur as minerals magnetite （Fe3O4） and hematite （α-Fe2O3）, which are derived mainly from the decomposition and oxidation of iron-bearing minerals in coal during combustion. EDX data indicate that ferrospheres also contain Si, S, Al and Ca resulting from quartz, mullite, anhydrite and amorphous materials. A large percentage of ferrospheres are commonly 5-50 μm in size. The microstructure of ferrospheres includes smooth, polygonal, dendritic, granular and molten drop characteristics. SEM coupled with EDX provided fast and accurate results of the microstructure and chemical composition of ferrospheres, and helped us to assess environmental issues related to the disposal and utilization of fly ashes.  相似文献   

Multilevel Mediation With Small Samples: A Cautionary Note on the Multilevel Structural Equation Modeling Framework     

Daniel McNeish 《Structural equation modeling》2017,24(4):609-625

Multilevel structural equation modeling (ML-SEM) for multilevel mediation is noted for its flexibility over a system of multilevel models (MLMs). Sample size requirements are an overlooked limitation of ML-SEM (100 clusters is recommended). We find that 89% of ML-SEM studies have fewer than 100 clusters and the median number is 44. Furthermore, 75% of ML-SEM studies implement 2–1–1 or 1–1–1 models, which can be equivalently fit with MLMs. MLMs theoretically have lower sample size requirements, although studies have yet to assess small sample performance for multilevel mediation. We conduct a simulation to address this pervasive problem. We find that MLMs have more desirable small sample performance and can be trustworthy with 10 clusters. Importantly, many studies lack the sample size and model complexity to necessitate ML-SEM. Although ML-SEM is undeniably more flexible and uniquely positioned for difficult problems, small samples often can be more effectively and simply addressed with MLMs.  相似文献   

How Age Affects Journalists’ Adoption of Social Media as an Innovation     

Yanfang Wu 《Journalism Practice》2019,13(5):537-557

American newsrooms are adopting social media as an innovation for greater engagement. However, several organizational and individual factors may affect the extent to which news outlets adopt social media innovations. In particular, there is assumed to be a divide among different age groups of journalists in embracing social media. Utilizing a structural equation modeling (SEM) analysis, the study seeks to understand how social media culture in newsrooms affects journalists’ strategies of taking social media as an innovation, and how journalists of different age groups differ in the SEM model fit. The analyses indicated Twitter engagement mediates social media culture and journalists’ attitude toward social media. However, that was not the case with Facebook. Additionally, while younger journalists favored Twitter, older journalists embraced Facebook and middle-aged journalists adopted both Facebook and Twitter. The analyses showed the more that middle-aged journalists interacted on Twitter, the more they tended to have a positive attitude toward social media. However, the more that younger and older journalists engaged on Twitter, the more they tended to have a negative attitude toward social media. Journalists from all three age groups tended to hold a negative attitude toward social media if they engaged more on Facebook.  相似文献   

蔬菜产业链组织效率影响因素的实证研究 ——以南京市蔬菜行业为实证   总被引：3，自引：0，他引：3  

谭涛  李道国  王凯 《科研管理》2007,28(3):63-69

产业链管理已经成为促进蔬菜行业发展的重要手段。在构建蔬菜产业链组织效率假设模型时,本文选取南京市蔬菜产业链作为实证研究对象,针对假设模型设计出一套调查方案与调查问卷,对南京市蔬菜产业链中的批发市场、加工企业与生产基地展开全面调查获取了79个样本数据。并运用主成分分析法与信度分析法对调查数据进行了有效性检验,进而建立结构方程模型(SEM)验证假设模型中各个影响因素之间相互关系的正确性,并进一步检验先前的假设模型,为加强蔬菜产业链的组织合作提供量化的证据。  相似文献   

食蟹猴疟原虫卵囊扫描电镜研究     

雷秋波 《中山大学学报论丛》1996,(Z1)

猕猴感染食蟹猴疟原虫子孢子产生速发和复发，利用扫描电子显微镜对速发型虫体卵囊和迟发型虫体卵囊进行了研究，结果发现速发型虫体卵囊和迟发型虫体卵囊有很大不同．速发型虫体卵囊壁光滑且较簿；而迟发型虫体卵囊壁较厚且有很多皱褶，而且有孔洞存在．认为两种类型的卵囊不是造成疟疾复发的原因，迟发型虫体卵囊上的孔洞不是在孢子逸出孔．  相似文献   

IF钢热镀锌板典型缺陷的扫描电镜分析     

孙方义  冯冠文  张彥文 《武汉工程职业技术学院学报》2011,(3):26-29

采用Quanta 400扫描电镜配合能谱仪对影响IF钢热镀锌板的夹杂、氧化铁皮、划伤、锌渣等典型缺陷进行了分析,结果表明,扫描电镜配合能谱仪分析可以有效的判断缺陷类型,结合生产工艺从而查找出缺陷产生的原因。  相似文献   

基于结构方程模型的孵化器综合绩效评价     

邱桂贤 《深圳职业技术学院学报》2011,10(3):54-58

在已有研究的基础上,基于数据获取的便利性,构建一套科技企业孵化器综合绩效的评价指标体系.探索了硬件环境、软件环境、服务能力、发展潜力和绩效产出5个指标之间的关系,根据我国部分国家级企业孵化器的统计数据,利用AMOS软件建立结构方程模型并对模型进行计算和求解.根据得到的因子载荷和路径系数确定各个评价指标的权重.  相似文献   

鸭绿江茴鱼鳃的扫描电镜观察     

赵玉敏  孙珩  乔淑芬  王艳萍 《通化师范学院学报》2011,32(4):31-33

用扫描电镜对鸭绿江茴鱼（Thymallus arcticus yaluensis）鳃的表面结构特征进行了详细的观察.结果表明：鳃耙、鳃弓、鳃丝及鳃小片细胞都有不同形状的隆嵴和刻纹等结构;鳃耙上有两种刺状骨质突起;鳃弓上有大小不同的空洞;鳃小片的上皮细胞表面凸凹不平;鳃丝上皮细胞隆起和刻纹较为发达,这些形态结构是与它的生理功能及生活习性密切相关的.  相似文献