matlab代码续行螺旋波线性非线性理论 代码(EZ-Spiral和Matlab)可重现[Sandstede&Scheel(2020)]中的计算。 使用说明 该存储库提供了由Dwight Barkley编写的代码,这些代码用于解析螺旋波及其光谱。 有关所用方法的详细信息,请参见和[Sandstede&Scheel(2020)]。 这些代码是按代码和模型分别组织的。 所有直接数值模拟均使用EZ-Spiral完成,并且代码位于以“ dns”开头的文件夹中。 使用Matlab在以“ matlab”开头的文件夹中进行螺旋波的连续性及其频谱的计算。
2022-12-19 16:10:38 133.29MB 系统开源
1
稀土离子(REs)掺杂的纳米粒子中的上转换发光已经吸引了相当多的研究关注,以用于固态激光器,三维显示器,太阳能电池,生物成像等领域。 然而,目前还没有关于稀土掺杂纳米颗粒的报道,以研究其极化能量转移上转换,特别是对于单个颗粒而言。 本文中,首次以单粒子光谱模式展示了掺稀土的氟化物纳米棒的极化能量转移上转换。 980 nm线性偏振激光激发后,观察到独特的发光现象,例如,在室温下急剧的能级分裂和单重态至三重态跃迁,多个偏振方向的离散发光强度周期性变化。 此外,制备具有可控制的长径比和对称性的纳米棒,以分析极化各向异性的机理。 比较实验表明,离子内的跃迁特性和晶体局部对称性主导着极化各向异性,这也被密度泛函理论计算所证实。 利用基于REs的上转换,建议用于REs掺杂的氟化物单纳米棒或纳米棒阵列的偏振各向异性的极化微观多信息传输方面的潜在应用。
2022-12-15 17:03:40 3.75MB Density functional theory calculations;
1
Quantum mechanics is at the core of our present understanding of the laws of physics. It is the most fundamental physical theory, and it is inherently probabilistic.
2022-12-15 14:09:38 8.04MB OPEN QUANTUM SYSTEMS
1
(解压密码 share.weimo.info)The study of network theory is a highly interdisciplinary field, which has emerged as a major topic of interest in various disciplines ranging from physics and mathematics, to biology and sociology. This book promotes the diverse nature of the study of complex networks by balancing the needs of students from very different backgrounds. It references the most commonly used concepts in network theory, provides examples of their applications in solving practical problems, and clear indications on how to analyse their results.,解压密码 share.weimo.info
2022-12-14 19:29:30 5.3MB 英文
1
计算理论 Elements of the theory of computation (2ed) CH3 答案,高清版,非扫描、翻拍。
2022-12-13 02:12:09 91KB Elements of Harry R.
1
group theory for physics
2022-12-09 21:06:25 33.02MB group theory
1
Information theory answers two fundamental questions in communication theory: What is the ultimate data compression (answer: the entropy H), and what is the ultimate transmission rate of communication (answer: the channel capacity C). For this reason some consider information theory to be a subset of communication theory. We argue that it is much more. Indeed, it has fundamental contributions to make in statistical physics (thermodynamics), computer science (Kolmogorov complexity or algorithmic complexity), statistical inference (Occam’s Razor: “The simplest explanation is best”), and to probability and statistics (error exponents for optimal hypothesis testing and estimation)
2022-11-30 22:21:53 3.92MB Element of Information Theory
1
这是关于小波的电子书,高清,最新版本,经典著作,英文版
2022-11-29 21:16:08 9.18MB  Wavel
1
Postgraduate Students 《Linear System Theory》 Course Examination 2021 Autumn Test time:100 minutes Test Form: Open-book exam (Note: This page is not answer sheet. Please write your answer on the answer sheet.) 一、Short answers. (10分) 1) How to judge the observability for linear constant system? 2) For continuous linear time-invariant(LTl) systems, what are the sufficient and necessary for arbitrary pole assignment?
1
Practical Mathematical Optimization Basic Optimization Theory and Gradient-Base 实用数学优化:基本优化理论与基于梯度的算法 本书为数学、工程、计算机科学和其他应用科学的高年级本科生和研究生提供了广泛的数学优化课程工具。介绍了优化的基本原理,重点介绍了基于梯度的数值优化策略和算法,可用于求解光滑和有噪声的不连续优化问题。还注意到函数求值的困难和存在多个最小值,这往往不必要地抑制了基于梯度的方法的使用。这第二版介绍了仅梯度优化策略的进一步改进,以处理目标函数中的不连续。新的章节讨论了代理模型的构造,以及新的仅限梯度解决方案策略和使用Python的数值优化。一个特殊的Python模块以电子方式提供(通过springerlink),它使文本中的新算法易于访问并直接适用。数值例子和练习包括鼓励高级到研究生水平的学生计划,执行,并反映数值调查。通过对概念材料的深入理解,学生、科学家和工程师将能够发展系统和科学的数字调研技能。 https://link.springer.com/book/10.1007/978-3-3
2022-11-16 18:32:31 5.71MB 算法 最优化 梯度算法
1