产业集群环境下的知识创新体系研究

经济全球化的今天 ,激烈的市场竞争要求企业通过有效的知识创新来提高对环境的响应能力 ,增强其竞争力 ,产业集群有利于提高集群内产业组织的知识创新能力。本文首先阐述了产业集群对知识创新的促进作用 ,进而提出了产业集群的创新体系 ,从创新要素、创新过程两个角度分析创新活动的完成 ,最后对我国产业集群环境下的知识创新的发展提出了几点思考     

Component ACD Model and Its Application in Studying the Price-Related Feedback Effect in Investor Trading Behaviors in Chinese Stock Market

This paper explores the investors’ feedback to the price change by modelling the price-related dynamics of trading intensity. A component decomposition duration modeling approach, called the component autoregressive conditional duration (CACD) model, is proposed to capture the variation of trading intensity across time intervals between price change events. Based on the CACD model, an empirical analysis is carried out on the Chinese stock market that covers different market statuses. The empirical results suggest that the CACD model can capture the price-related dynamics of trading intensity, which supports the existence of the feedback effect and is robust across different market statuses. The authors also study how the investors react to the price change by examining the driven factors of the price-related dynamics of trading intensity. The authors find that the trading can be triggered by the fast rise in the price level and the high trading volume. Besides, investors are more sensitive to the price change direction in the sideways market than in the upward or downward markets.     

模糊随机过程的Itô-Henstock积分

定义和讨论了适应的模糊随机过程关于Brownian运动的模糊Itô-Henstock积分和模糊Itô-McShane积分及其性质,给出了刻画定理,并讨论了两者之间的相互关系。结果表明,当模糊Itô-Henstock积分原函数Itô 绝对连续时,模糊Itô-Henstock积分和模糊Itô-McShane积分等价。     

桌式足球技术训练的教学实践与探索

基于桌式足球技术训练的基本原则,结合桌式足球技术训练的教学实践,总结了桌式足球技术训练的重点教学环节和内容及教学实践经验,探讨了提高桌式足球技术训练教学质量的教学方法和教学改革措施。教学实践和研究表明,在桌式足球技术训练的教学中,遵循桌式足球运动的内在规律,细化技术训练方法,采用灵活多样的教学方式和扩展有序的技术训练层次是提高教学质量和训练成绩的有效方法。     

Facile construction of novel CoMoO4 microplates@CoMoO4 microprisms structures for well-stable supercapacitors

A simple and controllable strategy has been developed to fabricate CoMoO_4 microplates/CoMoO_4 microprisms(CMCMs) structures on Ni foam via a facile, cost-effective, two-step hydrothermal route. The as-grown 3D architecture exhibited excellent areal capacitance of 4.33 F cm~(-2)at a galvanostatic chargedischarge current density of 50 mA cm~(-2)(6 Ag~(-1)) and outstanding cycle performance with only 2.8%degradation over 6500 cycles in the 3 M KOH solution. The asymmetric all-solid-state supercapacitors based on activated carbon(AC) and CMCMs exhibited much better electrochemical performance than the symmetric counterpart, showing an areal capacitance of 95.22 mF cm~(-2)at the current density of 12 m A cm~(-2)and excellent cycling stability with 92.27% of the initial capacitance after 5000 cycles. These results may provide useful guidelines for materials selection and configuration designs for the novel energy storage devices based on Co Mo O4 components and substrates.     

多窗口模式Roberts聚焦评价方法及其应用

自动对焦是图像测量和机器视觉中的重要技术。分析了自动对焦的基本原理,研究了自动对焦过程中的核心问题,提出了一种基于多区域聚焦窗口模式的改进Roberts聚焦评价函数的自动对焦方法。对图像进行滤波去噪预处理,选取多区域聚焦窗口,利用改进的Roberts聚焦评价函数进行评价,最后采用全局搜索和二分查找相结合的方法进行快速焦点定位。试验结果表明该方法兼顾了灵敏性、稳定性,可快速实现自动对焦。     

304L不锈钢在核电一回路水中应力腐蚀行为的研究

 在模拟核电一回路高温高压水环境中,采用慢应变速率拉伸试验方法,研究温度对304L不锈钢应力腐蚀开裂的影响规律。通过扫描电镜观察,对试样断口形貌进行分析。结果表明,在高压水环境中,随着温度的升高,材料有向脆性断裂转变的倾向,抗拉强度等参数变化不大,延伸率和断面收缩率略有降低;在研究温度范围内,304L不锈钢试样断口未发现明显脆性解理特征;温度处于200-345℃区间时,没有发现存在304L不锈钢敏感温度,材料应力腐蚀敏感性较低。     

某层间隔震实际工程动力测试与分析

为了检验某综合楼隔震层的实际工作性能,对这栋应用层间(首层柱顶)隔震技术的结构在环境激励和初位移这两种条件下的动力特性进行测试,得到结构的前几阶自振特性,如自振频率、振型和阻尼比.分析了初位移条件下隔震层的自由衰减曲线和滞回性能.测试表明:环境激励条件下,隔震结构与非隔震结构动力特性相似,说明隔震层尚未发挥隔震作用,隔...     

The effect of nanohybrid materials on the pour-point and viscosity depressing of waxy crude oil

The pipeline transportation of waxy crude oil is a problem both at home and abroad.In this paper,a novel nanohybrid pour-point depressant (PPD) was used to decrease the pour point and viscosity of waxy crude oil.The pour point and apparent viscosity of waxy crude oil was decreased significantly upon addition of the nanohybrid PPD,and the long-term stability of the nanohybrid PPD was superior to that of a conventional ethylene-vinyl acetate copolymer PPD.Polarized optical microscopy and X-ray diffraction were used to study the effect of the nanohybrid PPD on the crystallization of crude oil.Addition of the nanohybrid PPD reduced the amount of wax crystals,prevented their aggregation,and reduced the temperature at which the crude oil started to crystallize.The significant effect of this nanohybrid PPD on the pour point and viscosity depressing of crude oil is of great importance for facilitating the safe,efficient and energy-minimized transportation of waxy crude oil.     

A comparison of conditional predictive ability of implied volatility and realized measures in forecasting volatility

In a conditional predictive ability test framework, we investigate whether market factors influence the relative conditional predictive ability of realized measures (RMs) and implied volatility (IV), which is able to examine the asynchronism in their forecasting accuracy, and further analyze their unconditional forecasting performance for volatility forecast. Our results show that the asynchronism can be detected significantly and is strongly related to certain market factors, and the comparison between RMs and IV on average forecast performance is more efficient than previous studies. Finally, we use the factors to extend the empirical similarity (ES) approach for combination of forecasts derived from RMs and IV.