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Search Results: 1 - 10 of 232813 matches for " 刘超 "
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N体问题复合区域解析函数近似计算
Numeric Model of N-Body Problem on Domains
 [PDF]

, 章社生
Computer Science and Application (CSA) , 2013, DOI: 10.12677/CSA.2013.31001
Abstract:
研究粒子模拟的计算问题,推导出单连通区域和复连通区域的粒子相互作用径向分布函数的解析解,得到了双球域的分析解,对计算复杂性进行了研究,结果表明,当粒子数M = 1800时,计算误差小于分之一,分析解的计算时间非常少。对蛋白质的距离函数计算结果表明,分析解能显著减少计算量。
In this paper, proximately compute interacted N-body problem by analytic function, Analytic expression of radial distribution function of particles interacting is denoted by multiple integral, the analysis solution is obtained on double sphere domains. In the case of M = 1800, the error of analytic solution is less than 0.001, and numeric CPU time is much less than direct computation. The two polypeptide chains protein radial function is obtained, and points out that this method needs to be improved.
正脉冲切换系统的有限时间稳定性分析
Finite-Time Stability of Positive Implusive Switched Systems
 [PDF]

, 高彩霞
Pure Mathematics (PM) , 2015, DOI: 10.12677/PM.2015.53014
Abstract:
本文解决了正脉冲切换系统的有限时间稳定性。首先把有限时间稳定的概念推广到正脉冲切换系统,从解的存在性入手,用求解微分方程组的方法,系统的解若满足一些条件,即可证明系统的稳定性。最后给出正脉冲切换系统稳定的充分条件。
This paper addresses the finite-time stability of positive impulsive switched systems. First, the concept of finite-time stability is extended to positive impulsive switched systems, starting from the existence of solutions and solving differential equations. If the solution of the systems satisfies some conditions, then we can prove the stability of the system. Finally, the sufficient conditions of positive impulsive switched systems are given.
铁电极化调控CO在Pt表面的吸附
The CO Absorption on Pt Film Tuned by Ferroelectric Polarization
 [PDF]

, 曹觉先
Advances in Condensed Matter Physics (CMP) , 2015, DOI: 10.12677/CMP.2015.42006
Abstract:
基于密度泛函理论的第一性原理,以BaTiO3和PbTiO3两种典型的铁电材料为例,我们探讨了铁电极化对CO在Pt薄膜表面吸附的影响。计算结果表明当极化方向为正时,CO在Pt/PbO/PbTiO3表面顶位的吸附能为?2.53 eV,而当极化方向反向时,CO的吸附能变为?1.39 eV。这表明铁电薄膜的铁电极化可有效调控CO在Pt表面的吸附。这种调控主要是由于极化所诱导的界面电场有效地改变了CO的4σ、1π、5σ轨道与Pt5d轨道之间的成键耦合。我们的研究为寻找抑制质子交换膜“CO中毒”的催化材料提供了新的方法。
We investigated the CO absorption on Pt film tuned by ferroelectric polarization of BaTiO3 and PbTiO3. Our results have demonstrated that the adsorption properties can be dramatically mod-ulated by the ferroelectric polarization. Especially, we found that the chemisorption energy are ?2.53 eV with positive ferroelectric polarization for CO adsorbed on the top site of Pt/PbO/PbTiO3 while the chemisorptions energy reduce to ?1.39 eV with inversion of the polarization direction. It is found that the coupling strength for the 4σ, 1π, 5σ orbital and 5d orbital of Pt can be tuned by the interfacial electric filed induced by the polarization of ferroelectric film. Our studies provide new approach for carbon monoxide poisoning resistant in proton exchange membrane catalytic material.
微分算子和直线拟合在十字丝中心定位中的应用
Application of Differential Operator and Linear Fitting in Crosshair Center Pinpoint
 [PDF]

, 赵建
Software Engineering and Applications (SEA) , 2015, DOI: 10.12677/SEA.2015.43007
Abstract: 为了满足镜头中心偏差测量中十字丝中心精确定位的要求,本文提出了一种基于微分算子和直线拟合的十字丝中心定位方法。根据十字丝成像的特殊性,首先,使用微分算子分别在X方向和Y方向求差分得到十字丝X方向和Y方向的边缘。接着,采用正交最小二乘法将刚刚得到的X方向和Y方向的边缘分别拟合为X方向和Y方向上的两条直线方程。最后,计算两条拟合直线的交点作为十字丝的中心。实验结果表明:在分辨率为1292 × 964像元为3.75 μm × 3.75 μm的CCD采集到的图像中十字丝中心的定位精度小于1个像素,在镜头中心偏差测量过程中其定位精度小于2 μm。基本满足镜头中心偏差测量对十字丝中心定位精度高、抗干扰能力强、重复性好等要求。
In order to satisfy the requirement of crosshair center pinpoint for lens decentration measurement, a crosshair center pinpoint method based on differential operator and linear fitting is proposed. First, the edges of crosshair in both X and Y directions can be obtained by using differential operator to compute the difference in both X and Y directions. Then, two linear equations in both X and Y directions are fitted with orthogonal least square method using the edges obtained. Finally, the intersection point of the two linear equations is used as the crosshair center. Experimental results indicate that the precision of the crosshair center pinpoint is less than one pixel in the images grabbed by the CCD whose resoluntion is 1292 × 964 pixel and pixel size is 3.75 μm × 3.75 μm and the precision of pinpoint is less than 2 μm in lens decentration measurement. It can satisfy the system requirements of non-contact, online, real time, higher precision and rapid speed, as well as strong anti-jamming and stabilization.
WYSIWYG Display based on RichTextBox Control
基于RichTextBox控件的WYSIWYG显示


计算机系统应用 , 2004,
Abstract: WYSIWYG是对编辑软件所普遍要求具备的一种关键技术,该技术使得软件打印输出效果和屏幕显示效果完全一致.RichTextBox是VB所带的标准控件,该控件具备基本的图文显示、编辑和简单的格式设置功能,可以应付普通图文处理的需要.本文主要讨论如何对RichTextBox控件进行设置和编程,使其能够按打印输出的结果来显示其内容,即如何实现RichTextBox控件的WYSIWYG显示.
Simultaneous Determination of Chloroxylenol, Triclocarban and Triclosan in Cosmetics or Household Products by Reversed-Phase High Performance Liquid Chromatography
反相高效液相色谱法测定化妆品或洗涤用品中对氯二甲苯酚、三氯卡班和三氯生


色谱 , 2004,
Abstract: 1 实验部分1.1 仪器与试剂  Waters2690高效液相色谱仪,Waters2487双波长紫外检测器。四氢呋喃,甲醇,丙酮(均为色谱纯);Milli Q超纯水;对氯二甲苯酚、三氯卡班(纯度均为99%,Aldrich);三氯生(纯度不小于99%,Ciba公司)。1.2 色谱条件  色谱柱为SymmetryC18柱(250mm×4 6mm
大型泵站钟形进水流道流速场的试验研究

扬州大学学报(农业与生命科学版) , 1985,
Abstract: ????
离心泵叶轮内旋转流场激光测量的研究

扬州大学学报(农业与生命科学版) , 1994,
Abstract: ????采用双焦激光流速仪对离心泵叶轮内旋转流场和叶轮出口附近的泵涡壳流速场,选择3个不同方位的窗口进行了测量。所测量的3种不同运行工况,其流量分别为设计流量的1.0,0.70和0.38。不同窗口测得的两叶片间流道的流速分布表明,即使在设计工况下,整个叶轮各叶片间的流速分布也不是对称的。叶轮出口处的液流角从叶片吸入侧向叶片压力侧增大,叶片吸入侧出现脱流。这在非设计工况尤其明显,并同时产生二次流。在流量为0.38设计流量时,二次流较强。液流相对运动的主流从在叶片进口处的吸入侧转移到叶片出口处的压力侧。
双向钟形进水流道的试验研究

扬州大学学报(农业与生命科学版) , 1985,
Abstract: ????工程中已经采用的双向进水流道,虽然也有导流措施,但流态并不十分理想,往往有涡带产生,且名义高度较大,基础开挖较深。本文提出的双向钟形进水流道采用导流锥,消除了涡带,降低了高度。试验结果表明,双向钟形流道和单向进水流道一样,水力性能良好,是排灌结合泵站比较理想的一种新型进水流道。
浅析中国金银珠宝玉石市场的消费转型

矿物岩石 , 2014,
Abstract: 本文从消费结构转型、消费主力军变换、信息传播和国家政策催生收藏热等方面论述了中国金银珠宝玉石市场的消费转型.根据历年来的数据以及作者在一线以及珠宝展会的调研可以得出结论,中国金银珠宝玉石的消费转型正在急速进行,而这场革命性的专业也为珠宝从业者,特别是珠宝商带来了极大的挑战与机遇.而在这场挑战中,只要抓住机遇,抓住核心,必将成为转型大潮之中的王者.
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