迪昂主题的四个变奏

迪昂主题讨论的是抽象的法式思维和具象的英式思维之间的鲜明对比,本文则主要探讨迪昂主题的四个变奏。第一变奏阐明了抽象方法与具体方法在方法及结果上的实质区别。第二变奏对卡伦德一科恩提出的科学表征的紧缩主义进行了批判性的讨论。第三变奏从认识论结构主义角度探讨了模型与结构之间的关系。第四变奏联系抽象模型和具体模型的区分,批判性地讨论了模型与虚构的关系。文章最后给出了作者本人对具体模型之本质的看法,并阐明了为什么只有具体模型才能被视为是完全虚构的。     

文化丧失与文化回归——云南通海县兴蒙乡蒙古族文化变迁研究

"生活在大草原上的蒙古族在落籍云南通海县后,为适应新的生存环境,采借其他民族文化并创造出新的文化特质,传统的蒙古族文化逐渐丧失;中华人民共和国成立以后,随着与内蒙古蒙古族的交往增多,兴蒙乡蒙古族的文化认同得到强化,发生了以文化回归为主要特征的文化变迁。兴蒙乡蒙古族的文化丧失与回归现象,表明文化变迁是一个长期和持续的过程,任何一个民族都处于不断的发展变化之中,文化特质也将不断发生改变。     

试析抗战时期国共两党对中间势力的政策

抗战时期，国共两党的中间势力政策存在着向有利于抗战转化，具有共同的前提和相似的实施手段等共性，同时也存在对中间势力认识的不同，实施政策手段的不同，代表的阶级本质不同和运行的实践结果不同等差异性。抗日的共同目标、共御外侮的民族精神、国内外形势是政策产生共性的原因；阶级矛盾的现实存在、根本对立的抗战路线、中间势力的动摇性特点与中间势力不同的历史渊源则是政策出现差异性的原因。     

高校图书馆微信公众平台的媒介引力场模型及其影响因素——基于DEMATEL系统因素分析的大众传播视角

[目的/意义] 借鉴大众传播理论开展高校图书馆微信公众平台的媒介引力场模型及其影响因素研究,有利于高校图书馆与微信平台间的服务融合、创新优化与应用推广,对改善我国高校图书馆服务水平,促进高校图书馆的整体服务能力具有重要的参考意义。[方法/过程] 以马莱茨克大众传播模型（CMR）理论框架为基础构建指标因素,基于DEMATEL系统因素分析的大众传播视角,构建高校图书馆微信公众平台的媒介引力场模型,并对其影响因素进行深度挖掘分析。根据各指标要素的影响度、被影响度、中心度和原因度等影响因素的分析结果,结合因果关系四象限图,提出若干提升高校图书馆微信公众平台服务质量和传播效果的建议和对策。[结果/结论] 提出一种具有创新性、科学性、严谨性的高校图书馆微信公众平台媒介引力场模型和影响因素体系,为高校图书馆微信公众平台服务质量和传播效果评价体系构建提供理论参考辅助。     

"高压电器"课程教学改革初探

高压电器是高校电气工程专业的一门重要的基础课.本文从教学内容、教学手段和教学方式等角度对高校"高压电器"课程的教学改革进行了全面的研究,提出采用多媒体技术和引入专业实训等一些实用并且有效的教学方法,以达到提高教学质量和培养学生创造能力的目的.     

我国STEAM教育改革的阻力与消解

加快推进我国STEAM教育改革不仅是培养综合型、创新型、应用型人才的必由之路,也是提升国家竞争力和教育发展应对自身危机的可行之径。然而,改革中却存在诸多阻力。从“教育改革”的视角出发探赜改革蕴含的阻力因素,并提出阻力消解对策对促进我国STEAM教育顺利开展、探索一条具有中国特色的STEAM教育发展道路具有重要价值。研究发现,我国STEAM教育改革在实践中遭遇了价值阻力、制度阻力、实际阻力和自身阻力。为消解阻力,应坚持STEAM教育价值先行的基本理路,推进不同主体的自我变革;加强制度供给,理顺STEAM教育与现行制度之间的关系;加大STEAM教师队伍建设力度,推进STEAM课程改革;促进STEAM教育的本体回归,破解“跨学科悖论”。     

Deadzone compensation based on constrained RBF neural network

In this paper, a modified adaptive neural network for the compensation of deadzone is described, and simulated on a hydraulic positioning system, in which the dynamic model is separated into a series of connection of a nonlinear (deadzone) subsystem and a linear plant. The proposed approach uses two neural networks. One is the radial basis function (RBF) neural network, which is used for identifying parameters of deadzone. Based on the penalty function used in optimization theory, a multi-objective cost function with constraint is adopted to provide the best deadzone approximation. The result is used to train the other neural network for the inverse compensation of deadzone. The RBF neural network also generates the parameters of the linear plant for the design of an adaptive controller. A convergence analysis for the network training process is also presented.     

普通高等学校扩建的经济学分析

本文分析了高等学校扩建中应考虑的若干经济问题，诸如办学成本、经济规模、扩建风险，并提出了合理建议，以保持高等教育的健康协调发展。     

Validity evidence for the Chinese version Classroom Appraisal of Resources and Demands (CARD)

The Classroom Appraisal of Resources and Demands (CARD) was designed to evaluate teacher stress based on subjective evaluations of classroom demands and resources. However, the CARD has been mostly utilized in western countries. The aim of the current study was to provide aspects of the validity of responses to a Chinese version of the CARD that considers Chinese teachers’ unique vocational conditions in the classroom. A sample of 580 Chinese elementary school teachers (510 female teachers and 70 male teachers) were asked to respond to the Chinese version of the CARD. Confirmatory factor analyses showed that the data fit the theoretical model very well (e.g., CFI: .982; NFI: .977; GFI: .968; SRMR: .028; RMSEA: .075; where CFI is comparative fit index, NFI is normed fit index, GFI is goodness of fit, SRMR is standardized root mean square residual, RMSEA is root mean square error of approximation), thus providing evidence of construct validity. Latent constructs of the Chinese version of the CARD were also found to be significantly associated with other measures that are related to teacher stress such as self‐efficacy, job satisfaction, personal habits to deal with stress, and intention to leave their current job.     

Gelation Mechanism of Erythromycin Ethylsuccinate During Crystallization

In this paper, the gelation mechanism of erythromycin ethylsuccinate(EES) during crystallization is investigated for the first time. The generated semisolid gel-like phase exhibited a 3D fibrillar network morphology and the typical rheological properties of gels. The fibers inside the gel-like phase were confirmed to be new types of EES solvates using powder X-ray diffraction, thermogravimetric analysis/differential scanning calorimetry, and gas chromatography. The gelation and crystallization regions in EES-1-propanol solid–liquid phase diagram were determined. Analyses of solvent parameters showed that moderate solvent polarity may promote EES gelation. Fourier transform infrared spectra, nuclear magnetic resonance spectra, and scanning electron microscopy analyses indicated that through intermolecular hydrogen bonds, EES and solvent molecules assembled into fibers via crystallographic mismatch branching growth. The fibers intertwined into a 3D network microstructure and formed a gel-like phase, completely immobilizing the solution.