Error analysis of non-spherical raindrops on precipitation measurement     

解亚楠  周星里  杨正得 《上海大学学报(英文版)》2011,15(2):92-95

Radar cross section (RCS) of non-spherical raindrops is calculated by using the software CST based on finite integral method and compared with RCS of spherical raindrops. The revised factor of non-spherical raindrops is obtained. The radar reflectivity with precipitation change of four distribution models of M-P, Gamma, JD and JT combining the revised factor is gotten using trapezoidal integration. When the influence of non-spherical raindrops is considered, the accuracy of precipitation measurement of four distribution models can be separately improved 8.77%, 8.47%, 10.53% and 8.04% in the case of rain intensity is 100 mm/h.  相似文献   

盲生刻板行为研究综述     

谌小猛 《中国特殊教育》2011,(5)

盲生刻板行为在某种程度上具有不良影响,一些行为不仅对于自身身体有一定伤害,而且对于其融入主流社会造成了一定阻碍.尤其在先天盲生及多重残疾盲生中,刻板行为的发生率更高.因此,盲生家长和教师必须重视这些行为.本文通过文献研究,从盲生刻板行为的概念界定、出现率、产生原因、不良影响、评估和干预等几个方面,对盲生刻板行为的相关研究进行了概述.  相似文献   

体罚的社会文化基础、心理效应与干预机制     

沐守宽 《宁波大学学报(教育科学版)》2011,33(1):7-10

体罚是有意地直接或间接地引起受罚者的痛苦。体罚的广泛存在主要是由于施罚者的传统教育思想根深蒂固、缺乏有效的教育手段、教育方法简单化以及法律意识淡漠。体罚除了引起儿童的即时顺从以外,会造成对儿童的身体伤害,还可能导致儿童在道德内化、攻击、过失和反社会行为、亲子关系的质量、心理健康方面引起问题,而且这些效应会持续到成年期。因此,有效地遏制体罚,必须更新教育思想,树立平等民主的价值观,学会理性惩罚,建立家庭学校社区多元化监督机制。  相似文献   

三相四线有功电度表不接零线计量时的情况分析     

敦金惠  赵金红 《河北能源职业技术学院学报》2003,3(2):56-58

本文通过对三相四线有功电度表正确接线和某相电压线圈断路、短路时计量情况的分析，论述了三相四线有功电度表计量时接入零线的重要性。  相似文献   

8051单片机投料量控制系统     

顾学群 《南通职业大学学报》2001,15(2):28-29

本介绍一种用8051单片机控制的投料量测量系统功能，原理及接口电路，它适合化工生产过程中投料量的定量控制。  相似文献   

Unfolding Case‐Based Practicum Curriculum Infusing Crisis,Trauma, and Disaster Preparation     

Catie A. Greene  Amy E. Williams  Pamela N. Harris  Sterling P. Travis  Sharon Y. Kim 《Counselor Education & Supervision》2016,55(3):216-232

The authors evaluated an unfolding case‐based approach to a practicum in counseling course infusing crisis, trauma, and disaster preparation for changes in students’ crisis self‐efficacy across a semester. The course, informed by constructivist‐developmental pedagogy and centered on the unfolding case, resulted in significant increases in students’ crisis self‐efficacy.  相似文献   

Language use in kindergarten science lessons: language production and academic language during a video feedback coaching intervention in kindergarten science lessons     

Astrid Menninga  Marijn van Dijk  Annemie Wetzels  Henderien Steenbeek  Paul van Geert 《Educational Research and Evaluation》2017,23(1-2):26-51

This paper aims to gain insight into language production and academic language of 4- and 5-year-old students and their teachers in the course of a teacher intervention during kindergarten science education. The study is based on videotaped classroom observations, and specifically focuses on the academic language use of students (N_intervention = 18, N_controls = 26) and teachers (N_intervention = 5, N_controls = 5). The results suggest that this general teacher intervention yields interesting changes in language use and production. Patterns of change over time confirm the idiosyncratic and non-linear nature of these changes. Science lessons represent an appropriate context in which to acquaint students with academic language, which can be used as a basis to build upon more sophisticated language skills.  相似文献   

Usefulness of cognitive intervention programmes for socio-emotional and behaviour problems in children with learning disabilities     

Gila Schnitzer  Caroline Andries  Jo Lebeer 《Journal of Research in Special Educational Needs》2007,7(3):161-171

Behavioural and emotional problems occur more frequently in children with learning problems than in a cross-section of the general population, both at home and at school. While behaviour problems reportedly are a key obstructive factor impeding inclusive education, children with both behavioural and learning disabilities carry a high risk of social exclusion and school dropout when they are in mainstream environments. Meta-analyses indicated only a moderate impact of social skills training. To see what kind of intervention programme would be effective in modifying cognitive as well as socio-emotional behaviour and at the same time focusing on contextual interaction and intervention, a pilot study has been carried out in Belgium with 11–13-year-old students with learning disability and behaviour problems in special schools. A total of 24 children in the experimental group were matched against a control group of 24. Children in the experimental group, after having received 14 lessons of FIE (Feuerstein's Instrumental Enrichment Programme), showed a marked increase in some cognitive functions (hypothetical thinking, perception and understanding of humour) but not in others. A significant effect on socio-emotional behaviour could not be shown quantitatively, but was evident from qualitative interviewing. The mediating attitude of the teachers was a key influencing factor in producing lasting changes. Programmes such as FIE, provided they address children as well as teachers in a comprehensive way, focusing on cognitive as well as socio-emotional behavioural changes, may become powerful instruments to help children as well as teachers in a highly differentiated inclusive school environment.  相似文献   

Developing local oral reading fluency cut scores for predicting high‐stakes test performance          下载免费PDF全文

Sally L. Grapin  John H. Kranzler  Nancy Waldron  Diana Joyce‐Beaulieu  James Algina 《Psychology in the schools》2017,54(9):932-946

This study evaluated the classification accuracy of a second grade oral reading fluency curriculum‐based measure (R‐CBM) in predicting third grade state test performance. It also compared the long‐term classification accuracy of local and publisher‐recommended R‐CBM cut scores. Participants were 266 students who were divided into a calibration sample (n = 170) and two cross‐validation samples (n = 46; n = 50), respectively. Using calibration sample data, local fall, winter, and spring R‐CBM cut scores for predicting students’ state test performance were developed using three methods: discriminant analysis (DA), logistic regression (LR), and receiver operating characteristic curve analysis (ROC). The classification accuracy of local and publisher‐recommended cut scores was evaluated across subsamples. Only DA and ROC produced cut scores that maintained adequate sensitivity (≥.70) across cohorts; however, LR and publisher‐recommended scores had higher levels of specificity and overall correct classification. Implications for developing local cut scores are discussed.  相似文献   

精密电主轴结构设计及测控技术发展现状     

何强  李安玲  李丽丽  沈远  张国烨  杨光 《安阳工学院学报》2016,15(2):1-10

由于经济和环境因素,现阶段对高速、高精度、高效机床的需求越来越迫切,电主轴作为数控机床的关键功能部件,国内外学者在电主轴结构设计及测控技术方面做了大量的研究,取得了较好的研究成果。主要从国内外电主轴的结构创新、优化设计提高电主轴综合性能及电主轴的测量技术进行介绍,从中了解电主轴的研究现状,为我国电主轴设计人员及学者提供参考。  相似文献