北京市大兴区耕地质量等级监测控制点布设   总被引：12，自引：3，他引：9  

胡晓涛  吴克宁  马建辉  赵华甫  王倩 《资源科学》2012,34(10):1891-1897

本文以北京市大兴区为例,把理论模型构建和实证分析相结合,探讨耕地质量等级监测控制点布设方法。大兴区耕地质量等级监测变异半径为3.72km,布设理论监测样点43个,监测样点的控制范围为1086hm2,但若考虑到土地利用规划、土壤类型（亚类）、自然等各等别面积比例、利用等各等别面积比例、土地整理项目区、样点覆盖全面性等因素,监测样点合理布设数应为46个才能满足研究区耕地质量等级监测工作精度要求。研究表明,变异函数理论模型在研究耕地质量等级监测样点布设过程中具有较为理想的应用价值,可以提高监测样点的代表性和耕地质量监测信息的完整性。  相似文献   

武钢冷轧厂酸洗区域控制系统中的WinCC监控方案     

胡凡  胡鸣 《教育技术导刊》2010,(2)

武钢二冷轧酸轧站酸洗线(PicklingLine)是由德国西门子(Siemens)公司进行软件编程调试的酸洗板生产线。该生产线工艺先进,技术含量高,自动化控制程度高。该线采用WinCC监控系统使其在网络硬件以及软件控制思路上相比其他传统生产线都具有一定的先进性。描述了西门子WinCC组态软件在武钢二冷轧酸洗线中的应用,并阐述了相关的系统功能。实践证明,WinCC监控在生产中的应用效果良好。  相似文献   

Students’ and teachers’ monitoring and regulation of students’ text comprehension: Effects of comprehension cue availability     

《Contemporary educational psychology》2019

For regulation of text learning to be effective, students need to accurately monitor their text comprehension. Similarly, to provide adaptive instruction, teachers need to accurately monitor and regulate students’ text comprehension. Performing generative activities prior to monitoring has been suggested to provide students with diagnostic cues, improving monitoring accuracy; an open question is whether this would also help teachers. We investigated whether two generative activities, diagram completion and diagram drawing, improved secondary education students’ (n = 248) monitoring and regulation accuracy of text comprehension (Experiment 1) and whether viewing students’ diagrams improved teachers’ (N = 18) monitoring and regulation of students’ text comprehension (Experiment 2). Students’ monitoring and teachers’ regulation accuracy was higher in the diagramming conditions than in the no-diagramming condition. Students and teachers used diagnostic cues when judging students’ text comprehension: Improving students’ monitoring and teachers’ regulation of students’ text comprehension relies on improving accessibility of diagnostic cues.  相似文献   

People who cheat on tests accurately predict their performance on future tests     

《Learning and Instruction》2020

Studies suggest that people who cheat on a test overestimate their performance on future tests. Given that erroneous monitoring of one's own cognitive processes impairs learning and memory, this study investigated whether cheating on a test would harm monitoring accuracy on future tests. Participants had the incentive and opportunity to cheat on one (Experiments 1, 2, and 3, with N = 90, 88, and 102, respectively) or two (Experiment 4, N = 214) of four general-knowledge tests. Cheating produced overconfidence in global-level performance predictions in Experiment 2 (Cohen's d ≥ 0.35) but not in Experiments 1 or 4. Also, cheating did not affect the absolute or relative accuracy of item-level performance predictions in Experiments 3 or 4. A Bayesian meta-analysis of all experiments provided evidence against cheating-induced overconfidence in global- and item-level predictions. Overall, our results demonstrate that people who cheat on tests accurately predict their performance on future tests.  相似文献   

基于SNMP的MRTG流量监测系统应用     

贾昌国 《教育技术导刊》2008,7(8):122-124

在日常网络管理维护的工作中,如何有效地监测网络流量而较小地干涉网络运行,是当前网络流量监测的热点。对SNMP网络管理模型及流量监测体系结构进行了介绍,利用MRTG建立了一个采用被动监测方式的流量监测系统。该系统可以实时地通过收集网络上路由器、交换机或者需要被监测设备上的状态数据直观地生成流量向量图,而对网络参数的测量基本上不会影响到网络的正常运行。列举了两个利用流量监测系统的应用实例。  相似文献   

三江水系(宜宾段)水质主要污染负荷分析     

黄飞  孙佑佳  郭宗锋  贺亮  周明罗  凌超发 《宜宾学院学报》2008,8(12)

在对2001—2005年期间长江上游“三江”（金沙江、岷江、长江）水系宜宾段6个控制断面水质监测资料进行统计分析的基础上,对“三江”水系水质主要污染负荷进行了分析。结果表明,高锰酸盐指数、BOD5、石油类、总磷、总氮、铅和镉7项指标所占的污染负荷比较大。利用主成分分析方法进行了污染源解析,结果表明“三江”水系宜宾段水质污染主要来源于沿岸化工企业污废水、城市生活污水和电子元器件类工厂废水。  相似文献   

Co-constructors of data,co-constructors of meaning: Teacher professional development in an age of accountability     

Leyton M. Schnellert  Deborah L. ButlerStephanie K. Higginson 《Teaching and Teacher Education》2008

This research examines how engaging teachers in collaboratively constructing situated assessments enhances teacher professional development, fosters meaningful shifts to practice, and supports productive conceptions of accountability. We conducted case studies of six teachers engaged as partners in investigating new approaches to assessing and fostering literacy. Findings suggested that supporting teachers to generate, interpret, and act upon assessment data within instructional change cycles assisted them in monitoring student performance, grounding instructional decisions in data, and enacting changes to practice. We also document how collaboratively constructing assessments with teachers supported conceptions of accountability considered meaningful by individuals adopting differing socio-political perspectives.  相似文献   

略论三峡库区生态环境监测的几个问题     

叶德昌 《资源科学》1995,17(3):21-26

本文分析库区生态环境现状和系统研究三峡水利枢纽环境影响评价关于库区部分的结论之基础上。对三峡库区施工准备期、施工期和完建后几个重要的环境问题作了叙述。本文的一些结论可为库区建设、开展库区环境保护和管理工作提供决策的参考和依据，为三峡库区生态环境监测中心的三峡库区、生态  相似文献   

GPS/GSM/GIS在车辆安全监控系统中的应用   总被引：1，自引：0，他引：1  

王琳  毕雪芹 《科技广场》2007,(11):38-40

车辆安全监控系统融合了GPS、GIS以及GSM等技术,能够实现对车辆的精确定位和安全监控。本文介绍了车辆安全监控系统的整体结构,并且对于GPS、GIS以及GSM作了详细的阐述。  相似文献   

计算机监控系统在高速公路管理中的应用与开发     

张宇平 《辽宁科技学院学报》1999,(3)

计算机监控系统具有数据采集、监视、控制等功能,在各个领域获得了广泛的应用,本文以本溪隧道监控系统为例,介绍了QUICS监控系统在高速公路交通管理中的应用与开发。  相似文献