全站仪配合PC-1500在工程施工中的应用

介绍作者根据多年的测量经验,快捷完成道路、渠道等工程测量过程中直线段、圆曲线段的各种数据计算,特别适用于地形复杂、险峻,用经纬仪、水准仪放线难度较大地段的计算工作,快速、准确,易于掌握。     

全站仪测量技术在工程施工中的实际应用

笔者根据多年来的施工放样测量经验和程序型计算器卡西欧fx-4800p结合全站仪的测量技术,编制出直线段快捷测量方法和圆曲线段卡西欧fx-4800p计算器程序设计,借此可以解决测量中的多种难题,满足实际工作的需要。     

注聚剖面测井仪的设计及应用

注聚剖面组合测井仪是一种能测量自然伽马、流量、井温、压力和磁性定位的多参数仪器。这种仪器是由遥测短节、同位素释放器及伽马测量短节等组成,是一种既能测量注聚井的分层段注入量,也能连续测量注聚剖面曲线的仪器,所测资料能对各层段进行细分。本文详细地介绍了这种新型注聚剖面测井仪的结构、技术指标、测井原理、电路设计、现场施工和仪器特点。同时结合测井实例,对注聚剖面测井仪分层段注聚量和注聚剖面曲线的测试成果进行了分析。     

尿素车间一段分解塔筒节局部减薄原因及防范对策

对某化肥公司尿素一段分解塔筒节进行了宏观检验、仪器测量和壁厚校核。根据实际检验情况对尿素一段分解塔筒节的腐蚀原因进行了分析。结合实际情况对尿素一段分解塔筒节的修理和使用提出了防腐措施。     

拉伸试件测量方法的探讨

对拉伸试件拉断后标距段长度测量方法进行改进，提出一种新的拉伸试件的测量方法，得出测量结果，并对所进行的实验进行讨论。新方法能提高测量精度。     

路桥过渡段人体舒适性测量方法研究

本文介绍了加速度传感器的测量原理,通过在车内安装加速度传感器测得车辆通过路桥过渡段时由于振动而产生的竖向加速度,对数据通过matlab软件处理,得出车辆通过路桥过渡段时的加速度最大值和加权加速度均方根值,从而作为判断乘客通过路桥过渡段时的舒适性依据。     

浅析短线匹配法节段预制拼装梁测量控制技术

本文结合工程实例,总结了线控设计总体控制思路及要求,通过建立完善的测量控制体系并采取有利的测量控制技术,借助现代先进的软件技术进行几何监控,对测量原始数据进行转换与校核,使得节段梁线性监控变得方便有效.     

复杂地区大型项目控制网设计与实施——广深沿江高速公路广州、东莞段施工测量控制网

施工测量控制网的设计、实施与管理虽是高速公路施工中一项基础性工作,但对于跨越时间较长的大型项目并且点位处于复杂地区的施工测量控制网,如何既满足施工又要保证成果可靠,网形设计与过程控制实施是一项关键点与难点。本文结合广深沿江高速公路广州、东莞段施工测量控制网的实践,总结了克服这些难点的一些有效措施。     

路基施工要点

从施工测量、路基土方施工和路桥过渡段施工质量控制等方面阐述了路基施工过程中的质量控制措施，并讲述路基施工过程中一些病害的现场处理方法。     

浅谈宁河北地下水源地管道穿越工程测量放线施工

宁河北地下水源地管道穿越工程测量放线施工工程水源地为天津市宁河县北部丰台地区东棘坨村北的取水井群,经集水管线,加压泵站,输水管线送水至天津经济技术开发区自来水厂,此工程包括井群集水管线及加压泵站工程和供水管线工程两部分。文章介绍了如何利用全站仪等现代化测量工具,在蓟运河穿越(汉沽下坞段)工程中展开施工测量工作,其中着重介绍了现场平面控制及高程控制建立、施用、测量成果的收集、整理及核实。     

基于某中小河流项目治理断面形式的应用分析

当前,河道综合治理断面形式主要有梯形、矩形、复合式这三种断面,护坡方式主要是混凝土、砌石、石笼、土工植生袋、草皮这五种护坡方式。论文以某河道治理工程项目为例,对比矩形断面重力式挡墙防洪堤与复合式断面宾格石笼+草皮护坡工程的应用。研究表明:采用复合式断面宾格石笼+草皮护坡更适合本工程,有利于降低工程造价、实现绿色生态、结构合理。采用瑞典条分法对其三种工况进行稳定性计算,表明设计中选定的防洪堤断面形式合理。     

坐标法在测量巷道断面及标定巷道腰线中的应用

采用全站仪坐标法,通过测定巷道断面上的假定坐标,标定巷道腰线和测定巷道断面尺寸,解决了以往巷道断面尺寸难以准确测定难题,简化了测量程序及计算步骤,提高了测量效率和精度。     

双侧壁导坑法开挖大断面软岩隧道施工技术

对于大断面软岩隧道施工,常规的台阶法开挖,极易造成拱顶大面积暴露、松动导致坍塌,此类情况均采用双侧壁导坑法设计。双侧壁导坑法开挖断面能够最大限度的保证施工安全,适合应用于大断面软岩隧道。     

浅谈道路横断面设计

道路横断面组成及类型;行车道、路肩、人行道的宽度和横坡度;中间带、路侧带的设置;平曲线加宽、超高的原因和计算方法;爬坡车道与避险车道的设置;行车视距及视距保证;横断面设计方法、土石方数量计算及调配等问题。     

一种内力图的简便画法

内力图能清楚显示构件各截面内力大小和方向，在对构件进行强度校核时，内力图是最为关键的一步。而传统截面法计算很复杂，步骤十分烦琐。基于此，采用一种内力图的简便画法，避免复杂的计算，通过观察直接画出。     

The cross section of Chinese commodity futures return

This paper investigates the cross-section of expected commodity futures returns in China using a large panel of 13 individual factors. We find that 6 out of 13 individual factors produce positive and significant returns. To aggregate the information among these factors, we apply not only the traditional Fama-MacBeth regression (FM), but also a set of alternative methods, including the forecast combination method (FC), principal component analysis (PCA), principle component regression (PCR) and partial least squares (PLS). It turns out that PLS outperform other methods in forecasting the cross-section of Chinese expected futures returns. The equally weighted combination of 5 methods produces an even higher annualized return and lower standard deviation compared to each single method. The investigation of factor importance reveals that the skewness (SKEW) factor is more important than other factors in predicting expected futures returns in Chinese markets.     

A cross-section average-based principal components approach for fixed-T panels

Because of the increased availability of large panel data sets, common factor models have become very popular. The workhorse of the literature is the principal components (PC) method, which is based on an eigen-analysis of the sample covariance matrix of the data. Some of its uses are to estimate the factors and their loadings, to determine the number of factors, and to conduct inference when estimated factors are used in panel regression models. The bulk of the underlying theory that justifies these uses is based on the assumption that both the number of time periods, T, and the number of cross-section units, N, tend to infinity. This is a drawback, because in practice T and N are always finite, which means that the asymptotic approximation can be poor, and there are plenty of simulation results that confirm this. In the current paper, we focus on the typical micro panel where only N is large and T is finite and potentially very small—a scenario that has not received much attention in the PC literature. A version of PC is proposed, henceforth referred to as cross-section average-based PC (CPC), whereby the eigen-analysis is performed on the covariance matrix of the cross-section averaged data as opposed to on the covariance matrix of the raw data as in original PC. The averaging attenuates the idiosyncratic noise, and this is the reason why in CPC T can be fixed. Mirroring the development in the PC literature, the new method is used to estimate the factors and their average loadings, to determine the number of factors, and to estimate factor-augmented regressions, leading to a complete CPC-based toolbox. The relevant theory is established, and is evaluated using Monte Carlo simulations.     

Leisure and long-run risks: An empirical evaluation on value premium puzzle

I study the ability of a long-run risk model, with nonseparable leisure and consumption, to price the cross-section of U.S. equity returns over the 1948–2015 period. The stochastic discount factor features innovations to future leisure and consumption growth as factors. The model performs well, in terms of a variety of criteria, relative to competing models in explaining the cross-section of the spread in size and value portfolios.     

A Long-run Disaggregated Cross-section and Time-series Demand System: An Application to Italy

In this paper, we study a long-run disaggregated model of consumption following an approach based on an integrated cross-section and time-series demand system. The study consists of three steps. First, a cross-section analysis is performed on data from household budget surveys. At this stage, the problem of 'zero expenditures' is solved. The cross-section results are transformed into variables for use in the time-series system of demand. Then, this demand system is built and estimated. Some results for Italy concerning both the cross-section and the time-series analyses are presented.     

《工程制图》中剖视图的方位表达与标注关系

在工程制图中,表示剖视图(或断面图)剖切平面位置的剖切符号、表示投射方向的箭头、以及字母名称等,标注在不同的视图上,得到的图形方位是不同的。本文针对画图时经常遇到的剖视图(或断面图)的配置、图形的方位以及标注视图的位置等疑惑问题进行分析和探讨。并结合实例对剖视图的展开画法与标注进行了比较与分析。