类比建构在复变函数教学中的应用

复变函数教学中运用类比建构的方法,有助于学生系统掌握复变函数的基本理论与方法;加强教材中所讲授内容纵横联系对比,有助于启迪学生思维,发现新结论;引导学生自主探索,在总结深化中完善知识结构,有助于培养学生的创新能力.     

CPLD在ADS7812与CPU之间的接口应用

介绍了应用CPLD器件设计ADS7812与CPU之间的接口——“串并”转换电路。ADS7812是BB公司生产的高性能、低功耗12位串行A/D转换器。ispLSI1016是Lattice公司生产的低密度ispPLD器件。     

苏轼中秋词的还乡情结

通过对苏轼的四首中秋词的解读 ,发现苏轼被迫走出“美好”的现实生活后 ,经过炼狱般的苦难 ,怀着执着的挥散不去的浓浓的乡愁 ,最终找到了自己和自己的精神家园     

Small-group problem-based learning as a complex adaptive system

Small-group problem-based learning (PBL) is widely embraced as a method of study in health professions schools and at many different levels of education. Complexity science provides a different lens with which to view and understand the application of this method. It presents new concepts and vocabulary that may be unfamiliar to practitioners of small-group PBL and other educational methods. This article looks at small-group PBL from the perspective of complex adaptive systems (CAS). It begins with a brief review of the current understanding and practice of PBL. Next some of the characteristics of CAS are reviewed using examples from small-group PBL to illustrate how these characteristics are expressed in that context. The principles and the educational theory in which small-group PBL are embedded are related to CAS. Implications for health professions education are discussed.     

复常系数线性微分方程的解法

文[1]仅给出了y″+(a+bi)y′+(c+di)y=0的通解公式,本文先提出一类高阶复系数齐次方程的通解公式。进而利用待定系数法,得到了二阶复常系数线性非齐次方程特解的简捷求法,即直接利用公式写出相应方程的特解。     

复杂网络鲁棒性的一种基本参数

文章利用复杂网络传播与响应,研究了对复杂网络鲁棒性的影响参数。研究结果表明,复杂网络的相互作用系数,可以作为衡量复杂网络鲁棒性的一种基本参数。     

Predicting scientific research trends based on link prediction in keyword networks

The rapid development of scientific fields in this modern era has raised the concern for prospective scholars to find a proper research field to conduct their future studies. Thus, having a vision of future could be helpful to pick the right path for doing research and ensuring that it is worth investing in. In this study, we use article keywords of computer science journals and conferences, assigned by INSPEC controlled indexing, to construct a temporal scientific knowledge network. By observing keyword networks snapshots over time, we can utilize the link prediction methods to foresee the future structures of these networks. We use two different approaches for this link prediction problem. First, we have utilized three topology-based link prediction algorithms, two of which are commonly used in literature. We have also proposed a third algorithm based on nodes (keywords) clustering coefficient, their centrality measures like eigenvector centrality, and nodes community information. Then, we used nodes topological features and the outputs of aforementioned topology-based link prediction algorithms as features to feed five machine learning link prediction algorithms (SVM, Random Forest Classifier, K-Nearest Neighbors, Gaussian Naïve Bayes, and Multinomial Naïve Bayes). All tested predictors have shown considerable performance and their results are discussed in this paper.     

复杂动态环境下产业集群知识协同能力评价研究

在给出产业集群知识协同能力概念的基础上,构建复杂动态环境下产业集群知识协同能力评价指标体系,进而构建基于模糊广义回归神经网络(Fussy-GRNN)的产业集群知识协同能力评价模型并进行实例分析,结果表明,与已有研究相比,从环境维度、网络维度、文化维度和规制维度等构建的"四位一体"评价指标体系很好地反映了复杂动态环境下产业集群活动的复杂性、动态性、多维性和网络化等特点,可以客观、有效地反映复杂动态环境下产业集群的知识协同能力水平。此外,进一步构建基于Fussy-GRNN网络的产业集群知识协同能力评价模型。     

复凝聚法制备滁菊挥发油微囊的工艺研究

探索滁菊挥发油微囊的最佳制备工艺。采用复凝聚法制备滁菊挥发油微囊,以外观形态、粒径、包封率、载药量为指标,正交设计优选工艺条件。滁菊挥发油微囊的最佳制备工艺条件为:复合胶与挥发油的比例为1∶1,温度为55℃,p H为4.0,固化剂量为1.5m L。制得的滁菊挥发油微囊形态呈圆形、光滑,粒径分布在80~120μm,平均包封率为(48.89±5.93)%,平均载药量为(13.11±2.30)%,TLC法显示供试品溶液与对照品溶液在相同的位置出现相同斑点。该制备方法操作简单易行,处方合理,制得微囊外观圆整,载药量和包封率较高。     

复Gamma函数的定义形式及其等价证明的探讨

Gamma函数在复分析中占据了一定的地位。由于复数的复杂性,复分析中的Gamma函数产生了许多与数学分析中的Gamma函数不同的性质。Gamma函数的定义形式不唯一,它在复分析中主要有四种定义形式。试图系统地给出这四种定义形式的等价证明（其中,④■①为本人自己尝试给出的证明）。