重载铁路圆柱形桥墩横向振动试验研究

随着我国既有铁路扩能运输的实施,运营列车的轴重以及载运量逐步增加给圆柱形桥墩带来了越来越严重影响,如墩顶横向振幅过大、冲击振动加剧等,严重影响了铁路桥梁的安全运营。以朔黄铁路圆柱形桥墩为研究对象,理论结合试验分析其加固前后在列车荷载增大的情况下桥墩的横向动力特性,研究不同运营列车作用下桥墩横向振动的规律,评价分析该圆柱形桥墩加固效果,为重载铁路圆柱形桥墩的加固研究和维护管理提供科学依据。     

转型与整合——90年代前期长篇小说叙事语境及策略

针对耦合非线性混沌振子复杂的动力学行为,本文将Duffing振子和Van der Pol振子进行耦合,建立了Duffing振子和Van der Pol振子的耦合模型。与单个振子相比,耦合Duffing振子和Van der Pol振子表现出了更加丰富的动力学特性,采用Simulink仿真的方法,通过不同策动力幅值、不同耦合系数、不同频率下耦合非线性振子的相图和庞加莱截面图分析了耦合非线性振子的动力学行为,研究了耦合振子对微弱周期信号的敏感性和对噪声的免疫力,并将此模型应用于微弱信号检测的研究中。     

A Bayesian estimate of the concordance correlation coefficient with skewed data

Concordance correlation coefficient (CCC) is one of the most popular scaled indices used to evaluate agreement. Most commonly, it is used under the assumption that data is normally distributed. This assumption, however, does not apply to skewed data sets. While methods for the estimation of the CCC of skewed data sets have been introduced and studied, the Bayesian approach and its comparison with the previous methods has been lacking. In this study, we propose a Bayesian method for the estimation of the CCC of skewed data sets and compare it with the best method previously investigated. The proposed method has certain advantages. It tends to outperform the best method studied before when the variation of the data is mainly from the random subject effect instead of error. Furthermore, it allows for greater flexibility in application by enabling incorporation of missing data, confounding covariates, and replications, which was not considered previously. The superiority of this new approach is demonstrated using simulation as well as real‐life biomarker data sets used in an electroencephalography clinical study. The implementation of the Bayesian method is accessible through the Comprehensive R Archive Network. Copyright © 2015 John Wiley & Sons, Ltd.     

Hedging Barrier Options in GARCH Models with Transaction Costs

This study proposes a modified strike‐spread method for hedging barrier options in generalized autoregressive conditional heteroskedasticity (GARCH) models with transaction costs. A simulation study was conducted to investigate the hedging performance of the proposed method in comparison with several well‐known static methods for hedging barrier options. An accurate, easy‐to‐implement and fast scheme for generating the first passage time under the GARCH framework which enhances the accuracy and efficiency of the simulation is also proposed. Simulation results and an empirical study using real data indicate that the proposed approach has a promising performance for hedging barrier options in GARCH models when transaction costs are taken into consideration.     

On False Discovery and Non‐discovery Proportions of the Dynamic Adaptive Procedure

This paper studies the asymptotic behaviour of the false discovery and non‐discovery proportions of the dynamic adaptive procedure under some dependence structure. A Bahadur‐type representation of the cut point in simultaneously performing a large scale of tests is presented. The asymptotic bias decompositions of the false discovery and non‐discovery proportions are given under some dependence structure. In addition to existing literatures, we find that the randomness due to the dynamic selection of the tuning parameter in estimating the true null rate serves as a source of the approximation error in the Bahadur representation and enters into the asymptotic bias term of the false discovery proportion and those of the false non‐discovery proportion. The theory explains to some extent why some seemingly attractive dynamic adaptive procedures do not outperform the competing fixed adaptive procedures substantially in some situations. Simulations justify our theory and findings.     

北宋御制阵法、阵图与消极国防战略的影响

在中国古代战争中,为了更有效地发挥军队多兵种与群体作战的效果,产生了阵法以及阵图。至北宋时期,统治者长期对阵法予以高度重视,不断加以建设,更通过授阵图指挥作战。尽管宋朝君臣为此耗尽了心机,但因为当政者的主要目的是用来消极防御和控制将帅,因此这些产物恰恰违背了军事的基本原则与常识,束缚了军事将领的手脚,造成巨大的危害。     

高校图书馆对电子信息资源的使用与著作权保护

高校图书馆对电子信息资源的使用中要认真学习领会著作权法,科学地解决所面临的相关著作权问题,既要避免在对电子信息资源的使用中违反著作权法律法规的规定,又要积极采取新技术手段,充分运用法律保护自身的合法权益,因此,高校图书馆应在守法的前提下最大限度地发挥电子信息资源的效益。     

邓小平区域经济协调发展论与和谐广东建设

邓小平同志提出的部分先富,到共同富裕区域经济发展战略理论,实际上是区域经济学中的非均衡发展逐步向均衡发展推进战略理论深入浅出的描述。这个理论内涵了区域经济差距发展和协调发展的理论问题。在建设和谐广东的实践中,我们要以邓小平区域经济协调发展论为指导,努力创建“富裕、公平、活力、安康”的和谐广东。     

加强和改进教育学公共课实践性教学环节的探讨

作者根据多年的教学经验和对在校师范生、中小学青年教师的调查，认为加强和改进实践性教学环节是当前教育学公共课改革的一个关键问题。文章分析了实践性教学环节的涵义、特点、方式、功能等理论问题，概括了师范生对教育学公共课实践性教学环节的几个具体问题的评价，并提出了拟深入研究的若干重要问题     

对中华民族精神的内涵与时代特征的思考

民族精神是衡量一个国家综合国力的重要尺度。在参考过去对民族精神研究的基础上 ,以党的十六大报告为准绳 ,对民族精神的内涵和时代特征作进一步的思考研究很有必要。