正确看待绥化市“少儿英语热”——二语习得关键期假说的合理性研究

对大学英语四级成绩与英语学习起始年龄进行调查,根据关键期假说在少儿英语学习中应用的效果,探讨关键期假说与少儿英语学习之间是否存在必然的影响关系.通过调查和分析,认为少儿英语学习起始年龄与师资和语言环境以及学生的实际情况密切相关,并且应该注重少儿英语学习目标的确立和少儿英语师资的培养,以提高我国英语教学的水平.     

加强校园电视媒体实践促进校园文化建设

校园的媒体传播已经成为现代大学进行学生思想教育,学术交流的一个主流途径.文章以校园电视媒体建设为切入点,通过调查分析,论述校园电视媒体建设的意义,分析校园电视媒体建设构想,提出校园建设中的问题及解决问题的建议.     

魏晋南北朝士人妆饰时尚现象之探讨

时尚是社会的产物。时尚的形成与流行与当时社会政治、经济、文化等因素有着密切的联系。时尚并不是现代社会才有的现象。魏晋南北朝时代,男子"傅粉施朱"、"褒衣博带"成为名士们的时尚,通过对魏晋南北朝社会名士的妆容、服饰时尚现象的展现,从生产方式、人的觉醒、玄学兴起和人物品评等方面对魏晋南北朝社会男子妆饰时尚的形成、流行原因进行探讨。     

高职院校社会服务能力建设的实践与思考

本文结合绍兴职业技术学院在社会服务能力建设中探索和实践的经验,提出了高职院校开展社会服务能力建设面临的主要问题及其应对策略与方法,并从创建社会服务品牌,建立社会服务大平台、改革专业群课程设置、实施师资队伍强化工程、实施学生人才培养工程、创建社会服务基金和培训与技能认证相结合等方面进行思考,充分发挥院校特点和优势,开展社会服务能力建设。     

国内外医学期刊网站现状及分析

通过互联网了解国内外不同医学期刊网站建设的现状,对比发现国内与国外医学期刊的网站建设差距明显.对差距产生的原因做一分析并提出改进建议.     

State and unknown input estimations for discrete-time switched linear systems with average dwell time

In this paper, the problem of state and unknown input estimations for a class of discrete-time switched linear systems with average dwell time switching is investigated. First, a proportional integral observer with an exponential H_∞ performance is constructed to estimate the system state and unknown input simultaneously. Second, both of the observability and the stability of the estimation error system are analyzed, then the derivation of the observer gain matrices is transformed into the calculation of linear matrix inequalities. Third, the obtained results are extended to the systems with output disturbances. Finally, two simulation examples are provided to show the validity and effectiveness of the proposed methods.     

The obstacle problem of integro-partial differential equations with applications to stochastic optimal control/stopping problem

This paper is devoted to existence and uniqueness of minimal mild super solutions to the obstacle problem governed by integro-partial differential equations. We first study the well-posedness and local Lipschitz regularity of L^p solutions (p?≥?2) to reflected forward-backward stochastic differential equations (FBSDEs) with jump and lower barrier. Then we show that the solutions to reflected FBSDEs provide a probabilistic representation for the mild super solution via a nonlinear Feynman–Kac formula. Finally, we apply the results to study stochastic optimal control/stopping problems.     

Adaptive synchronization of coupled harmonic oscillators under switching topology

This paper investigates the adaptive synchronization for coupled harmonic oscillators with switching topology. Edge-based adaptive control protocols are proposed for both leaderless and leader-following synchronization for coupled harmonic oscillators with switching topology. Using Lyapunov stability theory, by parting the topology graph into connected components (containing at least two connected vertices) and isolated vertex components (containing a isolated vertex), full distributed adaptive synchronization conditions are obtained, which can guarantee that the synchronization conditions do not require any global information except a mild connection assumption. Finally numerical simulations are presented to illustrate the theoretical findings.     

"影像的文本"和"文本的影像"——图像学视阈下的历史的形象/文本再现

纪录片与历史著作在对历史信息进行叙述和再现时,会呈现出不同的方式,但同一媒介也会因为历史观的不同而出现另外的差异。