BTJ-5陀螺全站仪在轨道交通工程测量中的应用     

桂维振  刘阳  徐强  司典浩 《北京工业职业技术学院学报》2022,21(1):26-29

在介绍下架式陀螺全站仪定向原理的基础上,结合BTJ-5陀螺全站仪在广州市城市轨道交通11号线地下隧道控制测量中的应用,分析高精度全自动陀螺全站仪在轨道交通工程测量中的作业流程及注意事项,并对影响陀螺仪定向精度的因素及应对措施进行归纳总结,为高精度陀螺全站仪在相关领域的推广应用提供一定的技术参考。  相似文献   

The Domain-Specificity of Elementary School Teachers’ Judgment Accuracy     

《Contemporary educational psychology》2023

Teachers’ diagnostic competence for accurately judging students’ achievement is essential for instructional practice and professional decisions. To promote their judgment accuracy, it is important to know if this is a general or domain-specific skill. We investigated teachers’ judgment accuracy in German language (one subdomain: reading) and mathematics (two subdomains: geometry; stochastics) and examined differences across domains (i.e., German and mathematics) and across subdomains (reading; geometry; stochastics). We examined the judgment accuracy of 59 German elementary school teachers who teach both German and mathematics, judging the achievement of 1227 students in the three subdomains. We conducted multilevel analyses with a subsample of 39 teachers and 787 students and calculated different accuracy components (i.e., rank, level, and differentiation) to examine the comparability of our results. In line with prior research, findings revealed that teachers’ judgments were fairly accurate. However, there were significant differences between teachers’ average judgment accuracy in different subdomains (between-person comparisons) and no or only a weak relation between individual teachers’ judgment accuracy in different subdomains (within-person comparisons). Findings support the notion that teachers’ judgment accuracy of student achievement is domain-specific with respect to the investigated subdomains. Practical implications for the promotion of teacher judgment accuracy are discussed.  相似文献   

浅谈系统误差的发现与消除     

刘永军 《伊犁教育学院学报》2003,16(2):89-92

系统误差是影响测量结果精确度的主要因素,然而它又常不明显的表现出来。当它被忽视时,有时会对实验结果带来严重的影响,因此找出系统误差,算出它对结果的影响,设法修正或消除它的影响,是误差分析的一个重要内容。总结系统误差可能出现的几种类型,针对这几个类型,给出发现与消除系统误差的方法。  相似文献   

同等级仪表使用应注意的问题     

杨振萍  马美仲 《绵阳师范学院学报》1997,(Z1)

介绍电表准确度在表盘上两种标记方法的差异,通过计算讨论了每种标记的严格区别.  相似文献   

影响大学生篮球裁判员临场判罚的因素与对策研究     

王安大川  张健  王厚雷 《湖北体育科技》2016,(3):233-235

主要采用文献资料法、访谈法、观察法,对影响我校篮球裁判临场判罚的因素进行了以下具体的分析认为:在篮球比赛中裁判临场判罚时容易出现的问题是理论知识不熟、临场实践少、基本功不扎实、临场心理因素不稳定、体能欠缺、思想因素等方面有关系,解决问题的关键是加强我校篮球裁判对篮球规则和裁判法的理解,通过不断的实践,逐步提高自身的执裁水平;通过学习理论然后结合实践,不断积累临场经验,通过参执裁不同层次比赛的,在实践中不断增强自身的执裁能力,增强自信心;加强心理素质的培养和身体素质的锻炼。  相似文献   

Validity of Self-Reported Pedometer Steps per Day in College Students     

Brittany Star Overstreet  Scott E. Crouter  George A. Butler  Cary M. Springer  David R. Bassett 《Measurement in physical education and exercise science》2016,20(3):140-145

The purpose of this article was to examine the validity of self-reported pedometer steps/day. Forty-seven participants were provided a New Lifestyles NL-2000 (NL-2000; Lees Summit, MO, USA) pedometer and a physical activity (PA) diary for 3 weeks, but not informed of the data-storing capabilities. For weeks 2 and 3, each participant was given a step goal of 3,000 steps/day above week 1 average. A 2 × 3 repeated measures analysis of variance (ANOVA) was used to examine differences between reported steps/day. Bland–Altman plots assessed the mean bias and limits of agreement between reporting methods. Mean self-reported and NL-2000 steps/day were 9,264 ± 3,555 and 8,971 ± 3,590 steps/day (n = 26, p > .05). Mean biases were 216 ± 1,753 (week 1), –506 ± 1,355 (week 2), and –590 ± 1,360 (week 3) steps/day. Negative mean bias values indicate higher self-reported steps/day. Mean steps/day were similar between recording methods, but large differences were observed among individuals, suggesting self-reported steps/day may be valid for PA research at the population level, but not the individual level.  相似文献   

提高跳远助跑的准确性     

张明莲 《内江师范学院学报》2003,18(2):113-115

本对我院67名体育系学生的随堂测试的数据进行分析和研究，找出影响跳远助跑准确性的主要因素以及改进方法，从而提高教学质量。  相似文献   

一种医疗诊断专家系统的设计与实现     

李德云  刘桂萍  刘春强 《宁波职业技术学院学报》2007,11(5):30-32

针对目前公众自行购买非处方药治疗常见轻微疾病的过程中存在的问题,提出了开发基于Web的常见疾病自我诊断系统。该系统采用带有可信度的产生式规则表示法来表示常见病诊断知识,采用正反向混合推理模式,通过可信度的传递以及结论阈值的设定,实现了疾病诊断的数字化。经测试,系统诊断准确度达83%。本系统对完善常见病诊断方式、指导公众安全使用非处方药具有积极的作用。  相似文献   

数学概念教学方法探究     

戴剑萍 《黄山学院学报》2007,9(3):145-146

数学概念教学是数学教学中的难点与重点。文章归纳出数学概念教学的一些常用方法:具体与抽象结合;抓关健词;类比法;揭示本质特征;网络化;强调准确性。  相似文献   

A divine surprise: The golden mean and the round-oil error     

Sushan Konar 《Resonance》2006,11(4):91-99

This article deals with an example of the systematic round-off error that can be encountered in numerical computations. The example is based on the recursion relation used for calculating higher powers of the golden mean. In the process, the link between the golden mean and the Fibonacci sequence also becomes apparent.  相似文献