Bootstrap refinements for QML estimators of the GARCH(1,1) parameters

This paper reconsiders a block bootstrap procedure for Quasi Maximum Likelihood estimation of GARCH models, based on the resampling of the likelihood function, as proposed by Gonçalves and White [2004. Maximum likelihood and the bootstrap for nonlinear dynamic models. Journal of Econometrics 119, 199–219]. First, we provide necessary conditions and sufficient conditions, in terms of moments of the innovation process, for the existence of the Edgeworth expansion of the GARCH(1,1) estimator, up to the k$k$-th term. Second, we provide sufficient conditions for higher order refinements for equally tailed and symmetric test statistics. In particular, the bootstrap estimator based on resampling the likelihood has the same higher order improvements in terms of error in the rejection probabilities as those in Andrews [2002. Higher-order improvements of a computationally attractive k$k$-step bootstrap for extremum estimators. Econometrica 70, 119–162].     

真空辅助压浆技术在连续箱梁施工中的应用

预应力管道真空辅助压浆是为避免出现传统压浆存在不能完全密封的质量通病而产生的施工方法。文章从压浆前工作准备和压浆过程控制方面说明应该如何做好压浆施工工作,使真空辅助压浆施工方法达到应有的效果。     

水压法在现浇混凝土连续梁支架预压中的应用探讨

随着我国建筑工程的发展,我国混凝土材料的相关技术也取得了较大的发展进步。笔者将结合自己的工作经验,对支架现浇混凝土连续梁的有关施工问题进行分析,并对水压法的应用问题进行分析。     

后张法预应力简支箱梁的反拱设置

通过对预应力砼箱梁的徐变和施加预应力上拱值的分析研究,合理设置反拱,能够保证桥面线形顺畅、铺装层厚度及梁体结构受力安全。文章介绍了某高速公路特大桥的后张法预应力砼简支梁反拱值的设置,供同类工程施工参考。     

响水涧抽水蓄能电站下水库工程临时交通桥设计

响水涧抽水蓄能电站下水库跨泊口河交通桥属临时交通工程。整座桥坐落于Q3软质土基上,基础采用混凝土刚性基础,结构为重力式桥墩结合箱型钢梁。该桥结构简单,施工难度小,施工周期短,整桥的稳定性满足下水库高强度、大方量的土方运输要求。     

确保BZS空腹复合楼板施工质量探析

通过对空腹复合无梁楼盖新技术的应用,在工程实例中采用PDCA循环质量管理,找出影响空腹复合楼板质量的主要问题,并展开原因分析,确定改进对策后实施,总结了空腹复合楼板的施工技术及施工经验。     

A top box analysis of DinEX to optimize restaurant resources

This study examined the relative perceived importance of the various dimensions of the restaurant experience, as captured by DinEX. Over 1,000 U.S. restaurant patrons provided perceived importance ratings of six DinEX dimensions as they related to their most recent dining experience across a variety of meal periods and restaurant categories. To make comparisons, an innovative approach to analyzing top box data was utilized. The results indicate significant differences exist across each of the DinEX dimensions, with food quality emerging as the top concern of restaurant patrons. The results of the study offer valuable guidance to the restaurateur in terms of the distinct ordering of experience dimensions that were observed, as well as the straightforward methodology demonstrated for monitoring and evaluating customers’ importance perceptions.     

嘉绍大桥钢锚箱制作质量控制方法研究

根据嘉绍大桥钢锚箱的结构特点着重介绍嘉绍大桥钢锚箱制作难点及质量控制方法,并具体阐述了通过运用强化过程控制和三检制相结合的精细化质量控制法及各项措施的实施,有效的控制了嘉绍大桥钢锚箱的产品质量,一次报验合格率100%,桥址架设顺利。     

数字电视机顶盒的基本原理、技术及构成探讨

探讨了数字电视机顶盒的基本工作原理,分析其技术原理,并探讨了数字电视机顶盒的中间件结构。     

数字电视发展现状与前景展望

本文介绍了数字电视的优点、关键技术及目前国内外数字电视的发展现状，对目前数字电视的发展进程中可能遇到的问题进行了分析，提出了解决的思路，对国内外数字电视的发展前景提出了自己的优点。