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Search Results: 1 - 10 of 308402 matches for " 王怡 "
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一类分数阶导数微分方程的隐式差分解法
An Implicit Finite Difference Scheme for Space-Time Fractional Partial Differential Equation  [PDF]
张阳, 王瑞怡
Operations Research and Fuzziology (ORF) , 2013, DOI: 10.12677/ORF.2013.32002
Abstract:
分数阶导数微分方程作为通常微分方程的推广，被广泛地应用于工程，物理，信息处理，金融，水文等领域。本文给出了数值求解一类时间空间分数阶导数的双边空间微分方程的一种隐式差分格式，并对其稳定性和收敛性进行了理论分析，证明了格式的无条件稳定性并给出了收敛阶估计。
Fractional order differential equations are generalizations of classical differential equations. They are widely used in the fields of diffusive transport, finance, nonlinear dynamics, signal processing and others. In this paper, an implicit finite difference method for a class of initial-boundary value space-time fractional two-sided space partial differential equations with variable coefficients on a finite domain is established. The stability and convergence order are analyzed for the resulted implicit scheme. With mathematical induction skills, the scheme is proved to be unconditionally stable and convergent.
论长孙无忌与初唐政治
王怡
北京大学学报(哲学社会科学版) , 2014,
Abstract: 长孙无忌历仕唐高祖、太宗、高宗三朝,位尊权重。其在初唐政坛上之大作为,一是佐太宗夺嫡,一是定高宗储君地位,皆挟私心以为帝王个人效力,自始至终皆非唐朝社稷之臣。其在太宗朝,慑于太宗之英武,加以长孙皇后之约束,以善避嫌疑获得保全并为太宗所倚重。其在高宗朝,则因误认高宗柔懦,专擅政柄,终于招致杀身之祸。
基于突变级数法的中国低碳经济复杂系统综合评价
王,怡
长江流域资源与环境 , 2012,
Abstract: 低碳经济是人类社会实现可持续发展的内在要求和重要途径，是应对气候变化的必然选择。首先界定了低碳经济SREE复杂系统，该系统由社会、资源、经济和环境4个相互独立又相互联系的子系统构成的复杂巨系统。以此为基础，构建了包括经济系统、资源环境系统和社会系统在内的低碳经济复杂系统综合评价指标体系。考虑到运用突变级数法对指标体系进行评价的需要，指标体系全部由定量指标构成，避免了人为确定定性指标权重的主观性。其次，运用突变级数评价方法对2005～2009年的中国低碳经济复杂系统进行了评价。从评价结果来看，我国低碳经济复杂系统按照波浪型曲线运行，这是国际金融危机和国内经济结构调整双重因素导致的结果，同时也是复杂系统内部子系统相互影响、相互作用的结果。最后，提出了当前中国低碳经济复杂系统可持续发展的相应战略
立宪政体中的赋税问题
王怡
法学研究 , 2004,
Abstract: 以赋税问题作为看待财产权与宪政制度之关系的一个切入点，通过对财产权在宪政之先的论述，提出赋税的合法性问题。当前的财政危机导致对源自民间的赋税的依赖性增强，从而凸现出赋税合法性的危机。解决这一危机的方向是继续沿着财产权入宪的思路，确立“税收法定”的宪政主义的赋税模式。
民选的议会与不民主的立法：当代美国非正统立法程序考察
Elected Congress but undemocratic legislation: An observation on the unorthodox legislation in the contemporary US
王怡
- , 2018, DOI: 1672-3104(2018)04-0042-10
Abstract: 摘 要： 美国国会的立法程序以多级化、复杂化和专业化著称。在理论家看来，这一设计为立法过程中多元利益的充分博弈提供了重要场所。然而，精巧的理论在实践当中往往难以奏效。特别是近些年来，美国国会频繁利用程序中的灰色地带，为一揽子立法等非正统立法手段大开方便之门，使得大量议案绕过传统立法程序的关键环节，不经充分审议和辩论便获得法的身份。以至于已有不少学者宣称，教科书式的传统立法程序已名存实亡，非正统立法正主导着当今美国立法实践。理性认识美国的民主与法治，需要深度发掘和客观评价其议会民主实践。对当下美国国会立法中的非正统立法现象及其影响进行考察，或将为我国学界认识和反思西方民主制度和立法制度带来新的启发。
Abstract: American Congress is famous for its multi-level, complexity and specialization. Seen from the view of the theorists, this structure provides a workplace for the interest groups to communicate and negotiate with each other. However, the dedicate theory tends to be hard to implement in practice. In the recent years, American Congress has made frequent use of the grey areas to facilitate unorthodox legislation such as omnibus legislation, due to which, a large number of bills have been approved of without adequate deliberation and debate. Just as scholars comment, the typical legislation described in textbooks is dying with the unorthodox legislation dominating the Congress. In order to learn about the democracy and rule of law in America, we need to explore and evaluate the practice of the Congress. Examining the phenomenon and the impacts of unorthodox legislation in the contemporary US will shed some new light on our perception of the western democracy and its legislation institution
数字化商业策略之竞争优势—沃尔玛于中国市场之分析
Competitive Advantages from Digital Business Strategy—Analysis of Walmart in Chinese Market  [PDF]
王允中, 罗芳怡
Business and Globalization (BGlo) , 2016, DOI: 10.12677/BGlo.2016.43009
Abstract:
沃尔玛作为零售商的老大，毫无疑问其在全世界范围内都具有统治力。它的营运模式长久以来都是企业争相模仿的标杆。从传统意义上的策略角度来看，整个零售产业具有同构型极高进入门栏非常低的产业特质，应当说零售业是一个模仿障碍很低，竞争压力巨大且生存环境恶劣的产业。然而既便如此，沃尔玛依然能稳如泰山，长久领跑立于不败之地。在过去许多传统文献的研究中，专家学者们对沃尔玛的营运策略众说纷纭，既有谈到差异化竞争优势，也有提及低成本策略。但信息发达的今天，我们看到诸如亚马逊，淘宝，阿里巴巴等众多电商的异军突起，沃尔玛最赖以生存的法宝，强大的买方议价能力已经显现不出明显的竞争优势。相对于电子商务，传统超商的疲态主要显现在物流与服务方面，电商形成的客制化服务，以及点对点的送货上门，使得传统超商所能提供的便利性相形见绌。但本研究认为，类似沃尔玛之类的传统超商，其供应链与物流链都十分强大，如果能够合理使用信息管理系统，重塑消费者的消费习惯，传统超商将能捕获更大的价值收益。因此在本研究中，作者采用经济学中的常用概念，均衡分析，加以结合信息管理系统，力求从数字化商业竞争策略的角度来探讨传统零售商的新出路。同时，利用动态分析与静态分析的质性推导，多角度阐释沃尔玛在实务运作上存在的不足，并提出改善性的建议。供传统零售行业在策略营运上做出参考。
Wal-Mart as a bellwether in retail industry, there is no doubt that it has the dominance in worldwide. The Wal-Mart’s business mode strategy has long time been a benchmark for companies competing to imitate. From the strategy point of view in the traditional, the entire retail industry will face to high homogeneity and low entry barriers; in other words it should be said that the retail industry is a very low barrier to imitate, enormous competitive pressures and poor environment industry. Even so, however, Wal-Mart can still be a NO. 1 in retail industry and then invincible. In the past literature, many of researches focus on Wal-Mart’s business strategy, including different competitive advantages, low-cost strategy and so on. But they negative information technology and digital business strategy. Nowadays, as we seen the sudden emergence of the Amazon etc. electricity supplier, they have already shocked traditional business model. With respect to e-commerce, traditional stores show weakness mainly in the logistics and services. To be more specifically, e-commerce suppliers have customized service and point to point delivery, which the traditional store cannot offer. However, in this study we suggest that, the traditional chain store like Wal-Mart has powerful supply chain and logistics chain. If the traditional chain store can rationally use information management system, they will reshape consumer spending habits and gain benefit. Therefore, in this study, the authors used a common concept in economics, equilibrium analysis, to be combined with management information system, and strived to digitize from the perspective of commercial competitive strategy to explore a new way of traditional retailers. At the same time, this study points out the weakness and disadvantage of Wal-Mart in the real operation by the qualitative research method of dynamic analysis and static analysis as well as multi-angle
财务目标体系结构研究
王新,王怡
财会月刊 , 2005,
Abstract: 　　财务目标由于在财务学研究中具有重要地位，一直受到广大理论工作者的关注，研究也取得了瞩目的成就。但以往财务目标的研究大都局限于财务目标体系中的某一方面，而以单一目标指导理论研究和财务实践，容易造成以一概全、以点概面的不良后果，从而导致相关工作不能协调有序地开展。因此，有必要将中外财务目标理论研究的优秀成果按照财务目标体系结构的内在要求，科学地加以整合兼容，以推动我国财务目标理论的全面发展，更好地指导我国财务实践工作。　　一、财务目标体系结构的涵义　　财务目标体系结构可定义为：财务目标系统内部各组成因素之间按照一定的逻辑关系组合而成的，使财务目标能发挥作用的理性知识体系。
冀东太古代麻粒岩相变质岩中的K/Rb比值
王凯怡
岩石学报 , 1986,
Abstract: 前言铷是一个碱金属,它的离子半径(1.48(?))与钾的离子半径(1.33(?))十分相近,因此它可以取代所有含钾矿物中的钾离子。Shaw(1968)曾经建立了一个有关各类火成岩钾和铷变化的“主要趋势”(MT)(图1),其中K含量的变化范围是0.01—10%,K/Rb比值的相应变化范围是433—195。在一组同源岩浆的花岗质岩石中,铷在残余岩浆中的富集程度要高于钾,因此随岩浆分异作用的进行,K/Rb比值将随钾的增加而减小。但是,在许多前寒武纪的麻粒岩中,随钾的减少K/Rb比值则有急剧的增长(Tarney
词义与大脑机能一侧化
王乃怡
心理学报 , 1991,
Abstract: 在左右两侧视野同时呈现单字词和双字词的条件下,以速示的方法,比较了有听力的被试和聋人被试汉字识别时大脑两半球机能的非对称性。结果表明,有听力的被试对单字词和双字词的识别均表现为右侧视野的优势,而聋人组财表现为方向完全相反的左侧视野的优势。两组被试左侧视野的得分几乎相等,右侧视野的得分则聋人组明显地低于听力正常组。对抽象词和具体词的识别两组被试的同侧大脑半球都没有显示出明显的差别,表明大脑两半球对这两类词的识别可能并没有特定的选择性。因此,用速示的方法所反映出来的可能是在认读加工过程中大脑两半球不同加工机制的差别,与字义可能无关。
听觉疲劳的安全界限
王乃怡
心理学报 , 1987,
Abstract: 本文研究了500-1000Hz倍频程带噪声80-110dBSPL,连续暴露8分钟后,在听阈的恢复过程中听阈的回升与最大TTS随暴露的声级向高频转移时的相互关系。结果表明,当暴露的强度超过90dBSPL时,听阈在2000和4000Hz上的回升随声级增加而增加、而当强度达到98dBSPL以后,回升不再随声级而增加了。最大TTS开始向高频转移时的临界强度是95dBSPL,而此时也正好是回升在高频处于急剧增加的过程中。可以设想,听阈回升的增加和最大TTS的频率转移二者可能都反映着听觉疲劳的发展。因此,为了安全,可以把90dBSPL看做是500—1000Hz倍频程带噪声的最大允许声压级。
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