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Search Results: 1 - 10 of 325130 matches for " 王旦霞 "
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具有强阻尼的非自治非线性热弹耦合杆方程组的拉回D-吸引子
Pullback D-Attractor for the Non-Autonomous Nonlinear Thermoelastic Coupled Rod Equations with Strong Damping
 [PDF]

, 张建文
Pure Mathematics (PM) , 2012, DOI: 10.12677/pm.2012.22014
Abstract: 虑了具有强阻尼的非自治非线性热弹耦合杆方程组的拉回D-吸引子。首先利用Galerkin方法,证明了在一定的齐次边界条件和初始条件下系统在中的整体解的存在唯一性;其次通过先验估计,证明了系统的拉回D-吸收集的存在性;最后通过证明系统满足拉回D-条件(C),从而证明了系统的拉回D-吸引子的存在性。
In this paper, we consider the pullback D-attractor for the non-autonomous nonlinear equations of thermoelastic coupled rod with strong damping. By Galerkin method, the existence and uniqueness of global solutions are proved under certain homogeneous boundary conditions and initial conditions in ; By prior estimates, the existence of the pullback D-absorbing set is obtained; By proving the pullback D-condition (C), the existence of the pullback D-attractor of above mentioned equations is given.
写作前字幕视频输入对二语写作中生成性词汇的效用分析 The Effect of Pre-writing Captioned Video Input on Generative Vocabulary in Second Language Writing
,,刘晶
- , 2019,
Abstract: 本研究将字幕视频输入运用到二语写作领域,基于双重编码与多模态话语理论,以自由型生成性词汇使用为研究对象,分析了写作前英语字幕视频辅助性学习活动,相较于其他视听或阅读模式下的信息输入,对国内英语专业学习者写作过程中词汇生成能力的作用与影响。结果显示,写作前字幕视频输入情况下,学习者高级词汇使用比例增长最为显著,它更利于提高学习者二语写作中生成性词汇能力及降低对高频词汇的依赖。文章同时进一步指出这一调查结果的教学意义
基于五元組建模的微小型机器人体系结构研究
,成伟明,赵春,唐振民,镇兴
兵工学报 , 2008,
Abstract: ?履带式微小型机器人能够在室内或野外等各种复杂地域环境中工作,可被广泛运用在反恐、排爆、以及对危险环境的探测中。由于便携式微小型机器人具有的体积小,决定了其所具备的计算资源少等特点。提出了一种基于五元组,适用于微小型机器人基于多智能体体系结构的建模方法,实现了履带式微小型智能机器人体系结构系统。最后,通过机器人模拟仿真实验,验证了所实现的系统具有良好的实时性、鲁棒性以及稳定性。
遥感影像超分辨率制图研究进展
林皓波,柏延臣,锦地,
中国图象图形学报 , 2011, DOI: 10.11834/jig.20110404
Abstract: 尺度问题是土地覆盖分类中的一个核心问题,向下尺度转换又是其中的难点。混合像元分解可以得到亚像元尺度的类别组分百分比,但无法求得亚像元的具体位置。遥感影像超分辨率制图是由粗空间分辨率的影像得到高空间分辨率分类结果图的技术,可用于地表分类向下尺度转换,近年来该技术已成为遥感影像分类和尺度转换领域的研究热点。对超分辨率制图研究进展做了详细论述,从超分辨率制图的发展和研究现状、主要方法、精度评价等几方面进行了详细阐述,并分析了当前超分辨率制图算法存在的主要问题,以及可能的研究重点和发展空间。
非线性系统故障诊断的粒子滤波方法
张玲,刘志仓,,齐会云,
电子学报 , 2015, DOI: 10.3969/j.issn.0372-2112.2015.03.031
Abstract: 针对粒子滤波存在粒子退化问题,提出一种基于无迹卡尔曼滤波和部分重采样的改进的粒子滤波算法.通过无迹卡尔曼滤波产生重要性分布函数和使用部分重采样算法进行重采样,以丰富粒子的多样性.并针对非线性系统故障诊断中非高斯背景下,似然函数检测量难以导出的问题,提出一种基于多模型和似然函数值的诊断方法.仿真结果表明:改进的滤波算法的估计精度优于标准的粒子滤波算法及其现有的两种改进算法,提出的故障诊断方法能够做到快速检测与准确隔离.
Global solutions for a kind of generalized Sine-Gordon equation with strong damping
一类广义强阻尼Sine-Gordon方程的整体解

Zhang Jian-Wen,Wang Dan-Xia,Wu Run-Heng,
张建文
,,吴润衡

物理学报 , 2008,
Abstract: 同时考虑黏性效应及外阻尼作用研究了一类广义强阻尼Sine-Gordon方程-利用Galerkin方法,首先证明了该方程在初值u(x,0)∈H10(Ω),ut(x,0)∈L2(Ω)的条件下初边值问题存在整体弱解u(x,t),并证明了整体弱解关于初始条件具有
The existence and uniqueness of the global solution for the viscoelastic-plate equation under nonlinear boundary conditions
弹性矩形板方程在非线性边界条件下整体解的存在唯一性

Wang Dan-Xi,Zhang Jian-Wen,Wu Run-Heng,
,张建文,吴润衡

物理学报 , 2008,
Abstract: 考虑了在非线性边界条件下的弹性矩形板方程.利用Galerkin方法,首先证明了该方程在非线性边界(a)及初值w0∈W,w1∈W的条件下初边值问题存在唯一整体弱解w(t).其次证明了该方程在非线性边界(b)及初值w0∈W1,w1∈W1的条件下初边值问题也存在唯一整体弱解w(t).
Research progress in super-resolution mapping from remotely sensed imagery
遥感影像超分辨率制图研究进展

Lin Haobo,Bo Yanchen,Wang Jindi,Song Danxia,
林皓波
,柏延臣,锦地,

中国图象图形学报 , 2011,
Abstract: Scale problem is one of the central issues in land cover mapping from remote sensing imagery, and downscaling land cover data is a difficulty in this domain. Soft classification can provide more information than hard classification at pixel level. However, the spatial location of land cover compositions within each pixel is unknown. To solve this problem, many super-resolution mapping methods have been developed in recent years. In this paper, a review on recent development of super-resolution mapping methods is presented. The review focuses on the research status, major algorithms and accuracy assessment methods of super-resolution mapping. The main drawbacks, research challenges and future directions of super-resolution mapping are discussed.
高速钻进

科技导报 , 1980,
Abstract: 随着文明的进步,生活水准的日渐提高,天然资源的需用量日益增加,同时由于地表的以及较富的矿床已渐枯竭,人们被迫开发较深及较贫的矿产资源。因而科学及工程人员皆积极发展探矿、开发、采矿、选矿及冶炼的新知识及技术。
3种拉萨河鱼类肌肉脂肪酸的组成分析
Three Fishes Muscle Fatty Acid Composition Analysis of Lha-sa River
 [PDF]

洛桑, 蒋海, 增达瓦, 扎西,
Hans Journal of Food and Nutrition Science (HJFNS) , 2013, DOI: 10.12677/HJFNS.2013.21003
Abstract:

以拉萨裂腹鱼(Schizothorax waltoni)、双须叶须鱼(Ptychobarbus dipogon)、拉萨裸裂尻鱼(Shizopygopsis younghusbandi)为材料,研究了肌肉中脂肪酸的组成及含量。结果显示:10种含量最丰富的脂肪酸分别是饱和脂肪酸16:0和18:0;单不饱和脂肪酸16:1n-9、18:1n-9和18:1n-7;多不饱和脂肪酸18:2n-6、20:4n-6、20:5n-3、22:5n-3和22:6n-3。结果证明了拉萨河鱼类的脂肪酸模型跟深海鱼类具有一定的相似性,而且n-3型多不饱和脂肪酸的含量相对较高。
The fatty acid composition in muscle of three freshwater fishes Schizothorax waltoni, Ptychobarbus dipogon, Shizopygopsis younghusbandi was analyzed. The most abundant 10 fatty acids are the saturated fatty acids 16:0 and 18:0, the monounsaturated fatty acids 16:1n-9, 18:1n-9 and 18:1n-7, the polyunsaturated fatty acids 18:2n-6, 20:4n-6, 20:5n-3, 22:5n-3, 22:6n-3. The result showed that the pattern of fatty acids in the Tibetan fish resembled that of marine fish, and the content of n-3 polyunsaturated fatty acids were relatively higher.

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