Stochastic Optimal Control of First-Passage Failure for Rectangular Thin Plate Vibration Model under Gaussian White-Noise Excitations

A rectangular thin plate vibration model subjected to inplane stochastic excitation is simplified to a quasinonintegrable Hamiltonian system with two degrees of freedom. Subsequently a one-dimensional Ito stochastic differential equation for the system is obtained by applying the stochastic averaging method for quasi-nonintegrable Hamiltonian systems. The conditional reliability function and conditional probability density are both gained by solving the backward Kolmogorov equation numerically. Finally, a ...     

CFD Simulation of Film Flow and Gas/Liquid Countercurrent Flow on Structured Packing

A mathematic model of two-phase flow and a physical model of two-dimensional (2D) vertical section for the plate-type structured packing Mellapak 250.Y were set up and verified. The models were used to study the influence of packing’s surface microstructure on the continuity of liquid film and the amount of liquid holdup. Simulation results show that the round corner shape and micro wavy structure are favorable in remaining the continuity of liquid film and increasing the amount of liquid holdup. The appropriate liquid flow rate was determined by investigating different liquid loadings to obtain an unbroken liquid film on the packing surface. The pressure difference between inlet and outlet for gas phase allowed gas and liquid to flow countercurrently in a 2D computational domain. The direction change of gas flow occurred near the phase interface area.     

Stochastic Bifurcation of Rectangular Thin Plate Vibration System Subjected to Axial Inplane Gaussian White Noise Excitation

A stochastic nonlinear dynamical model is proposed to describe the vibration of rectangular thin plate under axial inplane excitation considering the influence of random environment factors. Firstly, the model is simplified by applying the stochastic averaging method of quasi-nonintegrable Hamilton system. Secondly, the methods of Lyapunov exponent and boundary classification associated with diffusion process are utilized to analyze the stochastic stability of the trivial solution of the system. Thirdly, the stochastic Hopf bifurcation of the vibration model is explored according to the qualitative changes in stationary probability density of system response, showing that the stochastic Hopf bifurcation occurs at two critical parametric values. Finally, some explanations are given in a simple way on the potential applications of stochastic stability and bifurcation analysis.     

试论昭通四筒鼓舞的保护与开发

四筒鼓舞是流布于昭阳区农村的一种丧葬祭祀舞蹈,亦是昭通较早进入云南省非物质文化遗产保护名录的舞蹈艺术,有较高的文化内涵与艺术价值.但由干多种因素的影响,四筒鼓舞的保护与开发面临严峻考验,保护与开发工作的到位与否,将直接决定四筒鼓舞的繁荣丰茂或消亡瓦解.     

生活是电影创作的唯一源泉——以优秀影片《红山雨》的创作过程为例

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郭沫若与傅斯年史料观比较研究

作为20世纪中国两位著名的历史学家,郭沫若和傅斯年在史料价值的重视、史料的搜集和整理方法以及史料的运用等方面都有极为相似之处;同时,二者的史料观又有一定的区别。郭、傅二人史料观之异同有其深刻的历史原因。     

从历史寓言走向文化寓言——新世纪内蒙古草原电影创作的审美转型

20世纪90年代以塞夫、麦丽丝为代表的蒙古族导演用他们气势宏大的历史题材系列影片蜚声中国影坛。进入21世纪以来,更多的蒙古族导演则将镜头对准草原民族当下的生存状态和现实境遇,即由对草原民族的历史寓言讲述转变为对草原民族文化寓言的书写。而这种审美转型主要体现在三个方面,即：由对历史事件的恢弘展现转向了对当下现实状态的深刻描绘、由对英雄祖先的讴歌赞美转向了对普通牧民生活与命运的关怀、由对草原民族传统艺术及民俗风情的奇观展示转向了对民族性格与文化内涵的深刻揭示。     

浅议中国电影中的戏曲电影

戏曲是中国古典文化的宝贵遗产之一,电影则是一种依靠现代工业基础而形成的技术与艺术相融合的独特表现形式。两者结缘是从二十世纪初电影刚刚由西方传入中国开始的。电影作为戏曲传播的新媒介,记录了戏曲的声像资料,并以自身的艺术特点影响到了传统戏曲的表演方式和舞美布景等各个方面。戏曲电影运用视听语言完成了对舞台戏曲的升华,对戏曲艺术的传承和发展起到了很大的推动作用。戏曲电影是中国特有的电影类型之一,它是电影艺术的发展和延伸。     

论《生死疲劳》中本源概念的翻译模式

文章以莫言的长篇小说《生死疲劳》原文及英译本为语料,建立汉英本源概念双语平行数据库,对其中的语言、社会、政治、宗教、物质和生态文化本源概念的认知翻译策略使用情况进行统计分析,总结其翻译模式,得知已有的翻译模式并不适用于所有的小说。     

TLC-UV-Vis测定山楂片中的苏丹红

建立了山楂片中苏丹红的薄层色谱-紫外可见分光光度测定方法 .实验条件:展开剂为正己烷:丙酮:乙酸乙酯=100:6:8,检测波长:苏丹红Ⅰ、Ⅱ、Ⅲ、Ⅳ分别在474 nm,488 nm,503 nm,510 nm检测.此方法中苏丹红Ⅰ-Ⅳ号标准工作曲线的线性方程分别为AⅠ=0.0464C+0.0031,RⅠ=1;AⅡ=0.0568C+0.0081,RⅡ=0.9999;AⅢ=0.0507C+0.0033,RⅢ=1;AⅣ=0.0236C+0.0012;RⅣ=1.线性范围分别是1-60μg/m L,最低检出限分别为0.02μg/m L、0.02μg/m L、0.04μg/m L、0.06μg/m L,苏丹红Ⅰ、Ⅱ、Ⅲ、Ⅳ回收率平均值分别为97.17%,98.00%,97.67%,95.05%.本方法设备使用方便,操作简单,且精密度和灵敏度好,准确度高,是一种简便可行的方法 .