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Search Results: 1 - 10 of 3695 matches for " 绝热不变性 "
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Exact invariants and adiabatic invariants of dynamical system of relative motion
Exact invariants and adiabatic invariantsof dynamical system of relative motion

Chen Xiang-Wei,Wang Xin-Min,Wang Ming-Quan,
陈向炜
,王新民,王明泉

中国物理 B , 2004,
Abstract: Based on the theory of symmetries and conserved quantities, the exact invariants and adiabatic invariants of a dynamical system of relative motion are studied. The perturbation to symmetries for the dynamical system of relative motion under small excitation is discussed. The concept of high-order adiabatic invariant is presented, and the form of exact invariants and adiabatic invariants as well as the conditions for their existence are given. Then the corresponding inverse problem is studied.
Melnikov方法没有平移不变性
陈立群
力学与实践 , 1994, DOI: 10.6052/1000-0992-1994-094
Abstract: 本文指出Melnikov方法应用中的一个问题,由该方法得到的参数空间中混沌区域受平移变换影响,因而对相同系统以不同方式应用该方法将得到不同的混沌阈值,最后初步分析了产生这种现象的原因。
共享合成Petri网的性质分析
庞善臣, 蒋昌俊, 孙萍, 周长红
自动化学报 , 2004,
Abstract: ?组合Petri网的性质不变性对大型合成系统分析有着重要意义,从分析共享合成Petri网的结构性质入手,分析了它的活性性质,给出了它的一个较为简单的活性判定的充要条件.在此基础上,研究了共享合成Petri网的活性与行为不变性和状态不变性的关系,为系统合成的活性和一致性的关系提供了分析依据.
基于Curvelet-散射特征的图像纹理分类
冯鑫,王晓明,党建武
农业机械学报 , 2012, DOI: 10.6041/j.issn.1000-1298.2012.10.033
Abstract: 在二代曲线波的基础上,提出一种旋转不变曲波特征,然后结合具有平移不变性和Lipschitz连续性的散射向量特征用于对纹理图像的分类研究。通过系统分析以及严格实验可以得出,旋转不变曲波纹理特征优于广泛使用的Gabor纹理特征,且Curvelet-散射组合特征在纹理分类上具有很高准确率以及计算纹理特征的效率,和单一的散射特征相比,具有一定的优势。
融合深度信息的brisk改进算法
张恒,刘大勇,刘艳丽,聂晨曦
计算机应用 , 2015,
Abstract: ?为了有效地利用rgb-d图像的深度信息,提高brisk算法的尺度不变性和旋转不变性,提出一种融合深度信息的brisk改进算法。首先,采用fast算法提取特征点,并计算每个特征点的harris角点响应值;然后,将整个图像划分为大小相同的网格,每个网格保留harris角点响应值最大的特征点;其次,根据图像的深度信息直接计算特征点的尺度因子;最后,计算以特征点为中心的圆的灰度矩心,通过灰度矩心和特征点的位置偏差确定特征点主方向。从尺度不变性和旋转不变性两方面对几种算法进行了对比实验分析。实验结果表明,相比brisk算法,改进后的算法在图像尺度变化时正确匹配特征点数提高了90%以上,在图像旋转时正确匹配特征点数提高了至少70%。
RENORMALISED STRESS-ENERGY TENSOR OF CONFORMAL SCALAR FIELD IN BOULWARE STATE IN REISSNER-NORDSTR?M SPACE-TIME
共形不变标量场在Reissner-Nordsttr?m时空的Boulware 态中的重整化能动张量

HUANG CHAO-GUANG,
黄超光

物理学报 , 1993,
Abstract: The renormalised stress-energy tensor of a conformal invariant scalar field in the Boul-ware stale in Reissner-Nordstr?m sapace-time is calculated by using the Page-Zannias method and with the help of a personal computer and REDUCE language. The tensor vanishes inthe asymptotically flat region and is not regular at the event horizon.
HIDDEN LOCAL GAUGE INVARIANCE IN FATEEV-ZAMOLO-DCHIKOV QUANTUM SPIN CHAIN UNDER OPEN BOUNDARY CONDITIONS
开边界条件下Fateev-Zamolodchikov模型的潜藏定域规范不变性

XIONG ZHUANG,GUAN XI-WEN,ZHOU HUAN-QIANG,
熊庄
,管习文,周焕强

物理学报 , 1992,
Abstract: Hidden local gauge invariance in Fatteev-Zamolodchikov quantum spin chain under open bondary conditions is studied in the framework of quantum inverse scattering method (QISM). Our results show that the Hamiltonian and its eigenvectors are explicitly gauge-dependent while the energy eigenvalues and the Bethe equations are gauge-invariant.
INVESTIGATION OF ONE-DIMENSIONAL NNN INTERACTION QUANTUN CHAIN BY CONFORMAL INVA-RIANCE AND THE LANCZOS METHOD
用共形不变性和Lanczos方法研究具有次近邻相互作用的一维量子链

ZHANG HAI-YAN,XU BO-WEI,
张海燕
,许伯威

物理学报 , 1994,
Abstract: The energies of the ground state and the lowest-excited states of the one-dime-nsional NNN interaction quantum chain are calculated by using Lanczos method. The a no=nalous dimensions and normalizing constant are given from conformal field theory.
A GAUGE INVARIANT VERSION OF SELF-DUAL THEORIES AND ITS QUANTIZATION
一种自对偶理论的规范不变形式及其量子化

MIAO YAN-GANG,
缪炎刚

物理学报 , 1993,
Abstract: For a newly proposed Lagrangian of self-dual fields interacting with gauge fields, we cal-culate its one-cocycle condition, i.e. Wess-Zum ino term, and construct its gauge invariant ver-sion. Through canonical quantization we show that the gauge invariant theory in a proper gauge-fixing is equivalent to its gauge noninvarianr version. Moreover, by using the Baralin-Fradkin-Vilkovisky formalism, we point out that the equivalence is gauge independent.
用于二维形状描述圆周分解法
王逸飞,陈雁秋
计算机科学 , 2006,
Abstract: 本文提出一种新的二维形状描述方法,用于描述二值和灰度图像物体的形状信息。该方法使用同心环状区域对二维形状进行分解,产生一组描述强度值的投影函数,并通过傅立叶变换实现旋转不变性和抗干扰能力。该方法与物体是否具有单一边界无关,能够适应各种复杂的、边界不规则的或者不连通的物体形状。此外,该方法还能够直接应用于灰度图象。
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