Sources of differences in the pattern of adoption of organizational and managerial innovations from early to late 1990s, in the UK

This paper explores empirically how the pattern of adoption of an organizational and managerial innovation changes as diffusion occurs. In particular, the paper investigates whether and how differences over time in the patterns of use of organisational innovation are related to changes in the characteristics of the innovation in terms of its functionality and relative complementarity with other innovations, as well as to changes in the needs and capabilities of firms. For this purpose, firm level data from the British Workplace Industrial Relations Survey, in 1990 and 1998, are used.     

推进绿色技术资源向企业转移的方法研究

在分析绿色技术资源向企业转移缓慢的原因及其对技术创新影响的基础上,提出了加快绿色技术资源向企业转移的对策．     

影响橄榄石集合体蠕变性质物化因素的研究进展

综述了高温高压条件下岩石和矿物流变性的实验研究结果,总结了影响橄榄石集合体流变性能的各种物理和化学因素.岩石和矿物在高温高压条件下变形的微观机制主要有2种:扩散蠕变和位错蠕变.橄榄石集合体在扩散蠕变机制作用下,应变率ε和差应力之间的关系为线性;在位错蠕变机制作用下,差应力指数n约等于3.在相同差应力作用下,温度、熔融组分与橄榄石集合体的应变率是正相关的.含水条件下,橄榄石集合体的强度显著降低.颗粒度对差应力和应变率的影响比较复杂,低应变率和小颗粒度对应的差应力指数约等于1;高应变率和粗糙颗粒度时,n为3左右.     

一种基于活动围道的纹理图像分割方法

将Gabor滤波器和各向异性扩散方程相结合,提出了一种基于活动围道的无监督纹理图像分割算法.采用基于总变分流的扩散函数,各向异性扩散方程可以有效地在保留纹理图像大尺度边界信息的同时,对图像纹理区域进行平滑,获得比原始图像更易分割的简化图像.但是平滑过程中纹理信息的丧失,限制了该方法的通用性和有效性.为了在利用各向异性扩散方法的同时,有效地提取和利用纹理信息,我们利用Gabor滤波器提取一组表征纹理方向性和尺度性的特征图像;同时将原始图像作为表征纹理灰度信息的一个特征通道考虑;再利用矢量形式的各向异性扩散方程,对特征图像进行边界保持的各向异性平滑.将基于区域灰度统计参数估计的活动围道分割方法扩展到矢量空间,来对平滑后的纹理特征量进行分割.实验证明,利用该纹理分割算法可以获得较好的效果.     

Modeling for the diffusion limitation of free radical polymerization

A new model was developed to describe the diffusion limitation on free radical polyme-rization. In this model the termination rate coefficient (k _t) and propagation rate coefficient (k _p) were expressed as a function of bulk viscosity (η). This model was used to simulate the batch thermal polymerization of styrene (St) and the continuous thermal bulk copolymerization of St (monomer 1) and maleic anhydride (MAH, monomer 2) in a CSTR with on-line monitor of the rheological behavior. The simulated results on polymerization conversion, copolymer composition, molecular weight and its distributions were compared with the experimental data, and the results calculated by two previous gel-effect models i.e. Martin-Hamielec and Tulig-Tirrell models. It was found that the present model produces better prediction than that of the Tulig-Tirrell model and has the same accuracy as that of the Martin-Hamielec model, but is much simpler. Project (29734130) supported by Natural Science Foundation of China.     

突发事件网络舆情谣言传播规律模型及对策研究

突发事件发生以后由于信息的匮乏,人们对信息的渴求也异于平常,谣言更容易被人们相信并传播。本文通过构建数学模型,利用MATALB数值仿真,分析突发事件网络谣言的传播机理、探讨控制谣言传播的因素、寻找控制谣言传播的对策,为政府的网络谣言控制决策提供理论依据和合理建议。     

Dynamic confinement of SAPO-17 cages on the selectivity control of syngas conversion

The OXZEO (oxide−zeolite) bifunctional catalyst concept has enabled selective syngas conversion to a series of value-added chemicals and fuels such as light olefins, aromatics and gasoline. Herein we report for the first time a dynamic confinement of SAPO-17 cages on the selectivity control of syngas conversion observed during an induction period. Structured illumination microscopy, intelligent gravimetric analysis, UV-Raman, X-ray diffraction, thermogravimetry and gas chromatography-mass spectrometer analysis indicate that this is attributed to the evolution of carbonaceous species as the reaction proceeds, which gradually reduces the effective space inside the cage. Consequently, the diffusion of molecules is hindered and the hindering is much more prominent for larger molecules such as C₄₊. As a result, the selectivity of ethylene is enhanced whereas that of C₄₊ is suppressed. Beyond the induction period, the product selectivity levels off. For instance, ethylene selectivity levels off at 44% and propylene selectivity at 31%, as well as CO conversion at 27%. The findings here bring a new fundamental understanding that will guide further development of selective catalysts for olefin synthesis based on the OXZEO concept.     

惯性购买行为下多品牌竞争的新产品扩散模型

在Bass扩散模型中添加阻滞系数以使其能够反映各品牌子市场惯性购买行为对更新换代产品扩散影响的基础上,综合运用消费行为学和随机过程理论,通过对顾客期望状态转移概率进行合理估计,建立了惯性购买消费行为下率先创新产品与模仿创新产品均以多品牌策略进入市场的品牌竞争扩散模型。     

微博信息传播效果研究综述

微博这一媒体形式出现后深刻地影响了信息的传播方式,因此一直是国内外学术界各学科领域关注的重点。研究方法不断完善,研究角度也越来越多元化。本文针对微博信息传播效果这一问题,对近年来国内外研究的典型文献进行梳理和总结,首先概述了微博传播效果的概念和测评方法,接着分类梳理了微博传播效果影响因素的相关研究,并对该领域的未来发展方向进行了展望,以期为今后的研究提供参考和借鉴。     

我国区域人文社科类高校知识传播效率差异及收敛性研究

文章使用DEA-Dagum基尼系数—收敛性检验方法,依据2009—2013年31个省份的面板数据测量我国人文社科类高校知识传播效率,分析区域差距及其收敛性.研究显示:东、中、西部地区知识传播效率依次递增.我国人文社科类高校知识传播效率低下受规模效率和纯技术效率低下的双重影响,纯技术效率低下影响更大.大部分省份处于规模报酬收益递减状态,区域内差距是全国整体效率差异的主要原因.全国及三大地区人文社科类高校知识传播效率差距均存在不同类型的收敛.