与工程检测相结合的“桥梁工程”课程实践教学改革探讨

针对"桥梁工程"课程教学中存在的一些问题,通过实践教学改革,结合工程实际应用,以增强学生的理论基础、实践意识和能力为目的,探讨实践教学改革的必要性和可行性。     

广州鹤洞大桥东引桥大直径钻孔灌注桩施工技术

根据实际工程管理过程中的体会,详细介绍广州鹤洞大桥东引桥１．８ｍ大直径钻孔桩的施工经验．     

普通螺栓群的偏心受拉分析

对普通螺栓群偏心受拉进行了分析 ,通过工程实际算例对两种简化计算方法与精确计算的结果进行比较 ,并得出相应的结论     

An effective approach to linear calibration estimation with its applications

Abstract

The availability of some extra information, along with the actual variable of interest, may be easily accessible in different practical situations. A sensible use of the additional source may help to improve the properties of statistical techniques. In this study, we focus on the estimators for calibration and intend to propose a setup where we reply only on first two moments instead of modeling the whole distributional shape. We have proposed an estimator for linear calibration problems and investigated it under normal and skewed environments. We have partitioned its mean squared error into intrinsic and estimation components. We have observed that the bias and mean squared error of the proposed estimator are function of four dimensionless quantities. It is to be noticed that both the classical and the inverse estimators become the special cases of the proposed estimator. Moreover, the mean squared error of the proposed estimator and the exact mean squared error of the inverse estimator coincide. We have also observed that the proposed estimator performs quite well for skewed errors as well. The real data applications are also included in the study for practical considerations.     

互感电桥法测量超导临界温度

本文描述了超导体临界温度的一种测量方法方.系统使用相敏深测,仪器成深头形式,可以直接插入杜瓦进行测量.该装置能测量小至12Oμg的超导体样品的临界温度,信噪比为10:1.     

A note on the residual median process

We study the residual median process, defined as the median of those observations which are greater than a number t. Using appropriate limit theorems, it is shown that the stochastic process converges in law to a Gaussian process defined in terms of a Brownian bridge.     

基于拓扑优化的折弯机结构优化设计

针对传统折弯机设计存在结构过于保守、笨重等缺点,以某数控液压折弯机为研究对象,利用Pro/E建立三维模 型,并根据有限元理论应用ANSYS Workbench软件对折弯机进行拓扑优化。以轻量化为目标,基于拓扑优化结果,给出 初步优化模型,再通过尺寸优化确定墙板和加强板厚度。最终给出满足强度刚度要求的结构优化方案,并使总体质量减 少。研究提出了在折弯机结构优化设计中,将拓扑优化与尺寸优化相结合的设计方法。     

Uniform asymptotic linearity in a regression parameter of a process based on a rank statistic

For X₁, …, X_N a random sample from a distribution F, let the process S^δ_N(t) be defined as where K²_N = σ^N_i=1(c_i ? c?)² and R x_i, + Δd, is the rank of X_i + Δd_i, among X₁ + Δd₁, …, X_N + Δd_N. The purpose of this note is to prove that, under certain regularity conditions on F and on the constants c_i and d_i, S^Δ_N (t) is asymptotically approximately a linear function of Δ, uniformly in t and in Δ, |Δ| ≤ C. The special case of two samples is considered.     

广州珠江黄埔大桥南汊主引桥衔接处线形控制技术

基于广州珠江黄埔大桥南汉悬索桥施工特点,针对悬索桥主引桥衔接处纵坡线形控制难题,提出解决方案.对于主桥端部钢箱梁纵坡线形的控制,提出两个调坡原则;对于伸缩缝纵坡线形的控制,提出须解决的关键问题及解决方法.所提方案解决了施工进度与施工工序之间的矛盾.     

A Year Then Forever: Personal Resolution Making and the Temporal Bridge of the Near Future

Based on in-depth interviews and drawing exercises with 25 resolution makers, this paper explores the use of time in structuring and enacting improvement projects of the self. Resolutions are intentional, identity-laden moments when people bring the future into the present. They provide a window into the identity work of the “near future”—an underresearched but fascinating site where individuals transition between what they see as an immediate, controllable future to a more distant one that is less certain. In attempt to mitigate the emotionally and cognitively daunting prospects of the distant future, resolution makers enlist time as a form of capital, constructing the “temporal bridge” of the near future by engaging in three interrelated processes: structuring and remembering, being flexible, and maintaining optimism.