对某古滑坡稳定性分析的探讨

古滑坡是一种不良地质现象,易诱发为地质灾害,对人类生命财产安全造成危害。本文以某古滑坡工程勘察实例为基础,对其成因及稳定性进行了分析评价,最后笔者得出了该古滑坡处于稳定状态,对工程影响不大,从而节约了工程投资。     

浮选机械设备的自动化技术

浮选设备自动化主要是对矿浆液面实现自动化控制,主要包括:浮选机液体传感器、液面自动控制系统、射流浮选柱的检测与控制系统、微泡浮选柱计算机监控系统和泡沫数字图像控制等。     

我国水上石油物流系统优化问题探讨

随着我国石油需求量及进出口量的不断增长,研究我国水上石油物流系统的优化问题日益重要,本文首先分析了水上石油物流系统研究的必要性,对国内外关于石油物流系统研究现状进行了评述,提出了我国水上石油物流系统优化问题的研究思路和方法.     

图像三维重建技术

基于图像的三维重建属于计算机视觉中的一个重要的研究方向,从提出到现在已有十多年的历史。文章首先对三维重建技术做了详细阐述,并着重从计算机图形学的研究角度对基于图像建模技术进行了综述,介绍了具有代表性的基于图像建模的方法及其最新研究进展,给出了这些方法的基本原理,并对这些方法进行分析比较,最后对基于图像建模技术的未来研究给出了一些建议和应解决的问题。     

Negative affectivity and workplace deviance: the moderating role of ethical climate

This study investigates (1) the relationship between employees’ trait of negative affectivity (NA) and workplace deviance and (2) the moderating role of ethical climate in the above relationship. Data was collected from 310 employees in 40 Taiwanese companies, and hierarchical linear modeling was used to test the hypotheses. Results show that NA was positively related to workplace deviance. In addition, the rules climate weakened the relationship between NA and workplace deviance, and both the instrumental climate and the caring climate strengthened the relationship between NA and workplace deviance. Managerial implications and future research directions are also discussed.     

Robustness issues in multilevel regression analysis

A multilevel problem concerns a population with a hierarchical structure. A sample from such a population can be described as a multistage sample. First, a sample of higher level units is drawn (e.g. schools or organizations), and next a sample of the sub‐units from the available units (e.g. pupils in schools or employees in organizations). In such samples, the individual observations are in general not completely independent. Multilevel analysis software accounts for this dependence and in recent years these programs have been widely accepted. Two problems that occur in the practice of multilevel modeling will be discussed. The first problem is the choice of the sample sizes at the different levels. What are sufficient sample sizes for accurate estimation? The second problem is the normality assumption of the level‐2 error distribution. When one wants to conduct tests of significance, the errors need to be normally distributed. What happens when this is not the case? In this paper, simulation studies are used to answer both questions. With respect to the first question, the results show that a small sample size at level two (meaning a sample of 50 or less) leads to biased estimates of the second‐level standard errors. The answer to the second question is that only the standard errors for the random effects at the second level are highly inaccurate if the distributional assumptions concerning the level‐2 errors are not fulfilled. Robust standard errors turn out to be more reliable than the asymptotic standard errors based on maximum likelihood.     

AutoCAD三维实体造型技术在道路工程制图教学中的应用

随着高职院校教学改革的不断深化,课程的理论教学时数普遍较以前减少,如何利用有限的课时使学生掌握必需的理论知识,提高学生的绘图和识图能力,是道路工程制图教学面临的实际问题。利用AutoCAD三维实体造型技术作为辅助教学工具,可以使学生快速建立空间立体概念,将抽象的问题直观化,教学效果良好。     

开展数学建模活动,提高学生创新能力

结合我校参加数学建模竞赛的具体实践活动,阐述了数学建模在培养学生综合运用知识与解决实际问题的能力中的重要作用,给出了我校在数学建模竞赛过程中的具体做法,论证了开展数学建模竞赛活动对推动高等院校数学教学体系、教学内容和教学方式改革的重要意义。     

客运专线基床表层级配碎石施工技术要点

铁路路基工程施工控制的关键在于基床,基床施工控制的重点又在于基床表层施工,客运专线施工质量要求严格,本文重点讲述了基床表层施工的控制要点。     

数学建模与创新应用型人才培养

培养具有创新精神的应用型人才已经成为很多大学的办学目标,数学建模正是培养学生创新精神与实践能力的有效方法。