基于Rankine理论的挡土墙卸荷台合理位置的研究

利用朗肯土压力理论,通过对最小倾覆力矩和最小土压力的求解,得出了挡土墙卸荷台的合理位置:在距填土表面的垂直距离为墙高的1/3～1/2范围内。     

具有二次性能指标的最优输出反馈的一个必要条件

本文用矩阵的秩这个工具考察了有限维线性系统具有二次性能指标的最优输出反馈问题，得到了一个必要条件。特殊情形下，这一条件可以演化为最优输出反馈增益与观测矩阵的乘积即为状态反馈增益这个相当清晰的关系。     

实二次代数函数域的单位群

对于实二次代数函数域K,给出了求K的基本单位ε的一个方法。利用此方法,对于 4个系列(细分为 1 6类)的实二次代数函数域K,明显决定出了它们的基本单位     

构皮滩水电站下游RCC围堰混凝土施工中的入仓方案

构皮滩水电站下游RCC围堰混凝土施工具有工期紧、强度大、施工质量要求高等特点。在充分考虑了施工现场的地形地貌基础上,采用自卸车直接入仓方案,通过对入仓道路及入仓口合理设计与施工,确保了混凝土顺利连续浇注,并且施工质量符合设计要求。     

我国技术产权交易市场的形成及功能研究

技术产权交易市场是近年来在全国各地涌现的集技术交易、产权交易以及资本市场诸多功能于一身的新型交易市场。这种创新型市场主要通过对原来技术交易市场、产权交易市场的创新以及重新设立等形式而产生。理论和实践表明,技术产权交易这一创新交易模式具备高效资源配置、理性投资、价值发现、完善风险投资体系等功能。     

高校网络群体性事件舆情演化规律初探——基于多项式拟合的定量分析

高校大学生群体由于文化素质高、思维活跃、关心社会、思想不够成熟等,在网络敏感事件的诱使下容易在网络上形成一些过激语言和行动,从而形成一些大规模的高校网络群体性事件,给社会造成了巨大的影响力。因此,有必要清楚地了解各类高校网络群体性事件网络舆情的演化规律,用定量分析的方法进行科学的论证和预测。本文通过搜集5个典型的高校网络群体事件舆情演化的历史数据,建立了基于多项式拟合的舆情演化规律模型,得到了各类高校网络群体性事件舆情演化的具体规律,为科学预测和及时应对高校网络群体性事件起到一定的借鉴作用。     

Optimization and Its Alternative in Media Choice: A Model of Reliance on Social-Influence Processes

In the reconciliation of rational-choice and social-influence approaches to media choice offered here, the choice process is decomposed into two subprocesses. In the first subprocess—that of rational choice—decisional ambiguity frustrates complete optimization. Optimization is partial, yielding a set of effectively interchangeable media alternatives over which the user is indecisive. In the second subprocess—that of social influence—imitation, deference, and other cues act on the set of interchangeables, yielding a single ultimate choice. If in the social-influence subprocess there are benefits to coordinating with others, group choice crystallizes around a single media alternative. If these benefits are absent, individual choice remains idiosyncratic, with each decision maker making random choices within the set of interchangeables. In organizational life, media choice transpires sequentially, with each choice conditioning a succeeding one. In its dynamic form, the present model explicitly incorporates such sequential environments: The twofold choice process transpires iteratively within individual decision sites (in the multiple purchasing decisions of a committee, for example) and sequentially across decision sites (from committee to individual, for example). The model generates considerable empirical implications. As decisional ambiguity grows, the rational-choice component of the choice process shrinks, implying upper-bound conditions for the explanatory power of rational-choice statistical models.     

Multi-layer self-organizing polynomial neural networks and their development with the use of genetic algorithms

In this paper, we introduce a new architecture of genetic algorithms (GA)-based self-organizing polynomial neural networks (SOPNN) and discuss a comprehensive design methodology. Let us recall that the design of the “conventional” PNNs uses an extended group method of data handling (GMDH) and exploits polynomials (such as linear, quadratic, and modified quadratic functions) as well as considers a fixed number of input nodes (as being selected in advance by a network designer) at polynomial neurons (or nodes) located in each layer. The proposed GA-based SOPNN gives rise to a structurally optimized structure and comes with a substantial level of flexibility in comparison to the one we encounter in conventional PNNs. The design procedure applied in the construction of each layer of a PNN deals with its structural optimization involving the selection of preferred nodes (or PNs) with specific local characteristics (such as the number of input variables, the order of the polynomial, and a collection of the specific subset of input variables) and addresses specific aspects of parametric optimization. An aggregate performance index with a weighting factor is proposed in order to achieve a sound balance between approximation and generalization (predictive) abilities of the network. To evaluate the performance of the GA-based SOPNN, the model is experimented with using chaotic time series data. A comparative analysis reveals that the proposed GA-based SOPNN exhibits higher accuracy and superb predictive capability in comparison to some previous models available in the literature.     

素数在域Q(u~[1/(l~n)])上素理想分解

设F=Q(u~[1/(l~n)]),其中l是奇素数.本文给出了奇素数p在整数环OF中的素理想分解形式.     

试析「見過ごす」与「見逃す」的语义异同

「見過ごす」「見逃す」语义相似:「見過ごす」有①看漏、错过,②不过问,③宽恕的语义,「見逃す」有①看漏、错过,②放走,③宽恕的语义.围绕该语义,从它们所接的对象语以及与相关句型的搭配使用来揭示其不同的语义特征.即:「見過こす」倾向从感性角度看问题,体现了对人、物的漠不关心、轻视的消极态度;而「見逃す」倾向从理性角度看问...