Correlations Among Five Demographic Variables and the Performance of Selected Jamaican 11th-graders on Some Numerical Problems on Energy     

Nicholas Emepue  Kola Soyibo 《International Journal of Science and Mathematics Education》2009,7(2):339-361

This study was designed to assess whether the level of performance of selected Jamaican 11th-grade physics students on some numerical problems on the energy concept was satisfactory and if there were significant differences in their performance linked to their gender, socioeconomic background (SEB), school location, English language and mathematical abilities. The 331 sampled students consisted of 213 boys and 118 girls; 197 students were from a high SEB and 134 students from a low SEB; 296 students were from seven urban schools and 35 students from three rural schools; 112, 153 and 66 of the students had high, average and low English language abilities, respectively, while 144, 81 and 106 of the students had high, average and low mathematical abilities, respectively. An Energy Concept Test (ECT) consisting of six structured numerical questions was employed for data collection. The results indicated that although the students’ level of performance was regarded as fairly satisfactory, there was a lot of room for improvement. There were statistically significant differences in the students’ performance on the ECT linked to SEB, and mathematical abilities in favour of students from a high SEB, and high mathematical abilities, respectively. There was a positive, statistically significant but weak correlation between the students’ (a) mathematical abilities, and (b) English language abilities and their performance on the ECT, while there were no correlations among their gender, school location, and SEB and their performance on the ECT.  相似文献   

12种二肽衍生物的非水毛细管电泳分离研究     

王延宝  ;王明清  ;白新伟  ;尤进茂 《温州大学学报(社会科学版)》2009,(5):46-51

以新型荧光试剂2-（11H-苯[a]咔唑）乙基氯甲酸酯（BCEC-Cl）为柱前衍生试剂,采用非水毛细管电泳技术对衍生二肽进行分离.以甲醇和乙腈为溶剂,乙酸-乙酸铵为缓冲体系,采用279nm二极管阵列检测.在甲醇与乙腈体积比为7：3、乙酸铵浓度为50mmol·L^-1、乙酸浓度为0.8mol·L^-1、柱温为25℃、分离电压为28kV的条件下,实现了12种二肽衍生物的基线分离.  相似文献   

Higher education in Federally Administered Tribal Areas of Pakistan after 9/11： Problems and prospects     

Syed Hafeez Ahmad Fatima A. Junaid 《美中教育评论》2010,7(5):55-65

The troubled state of affairs in the Federally Administered Tribal Areas （FATA） of Pakistan portends serious repercussions and grave consequences, destined to affect education particularly higher education in the entire tribal belt. Ironically, no extensive study has been conducted, to investigate those dimensions of FATA higher education which have been adversely affected in the aftermath of 9/11. This exploratory study examines those areas which have been badly affected as a result of current turmoil. In fact, the higher education in FATA has its own peculiar dynamics. Inherently, the entire tribal region has very few well-maintained and properly equipped colleges. Lack of adequate educational facilities, multiplied poor security environment has aggravated the entire situation. Law and order situation in the region has undermined the already dilapidated monitoring mechanism of education department. This state of affairs provides breeding ground for extremist propensities and radical tendencies. In reality, very little attention has been devoted to reform the education system in tribal areas. The whole set up needs to be rehabilitated by taking recourse due to the proactive role of international community. The paper concludes with recommendations for policy makers besides offering new avenues for further research.  相似文献   

Premiums,announcement returns and desperation in high tech mergers: A growth options analysis     

Sean M. Davis  Jeff Madura 《The Journal of High Technology Management Research》2017,28(1):61-78

We examine the announcements of high tech mergers using a relatively new proxy for growth options we call “growth to book.” We find this adds significantly to help explain the premiums paid and announcement period abnormal returns when acquiring tech targets. Higher synergies are expected by managers and investors when targets have low growth options and acquirers have high growth options, resulting in higher premiums paid and either less negative or more positive abnormal returns. However, we find significant variation in the results by the relative size of the target and when low growth to book (GTB) firms acquire. While high GTB acquirers tend to pay more in premiums, low GTB acquirers can pay higher premiums and receive some of the most negative returns at announcement. We find evidence some acquisitions are motivated by desperation as these acquirers have the lowest GTB and do a disproportionate number of the relatively largest deals, receiving the worst abnormal returns at announcement.  相似文献   

基于模糊控制的温湿度无线监控系统     

郭鹏  刘振永  杨彦彬  张玮 《石家庄学院学报》2009,11(3)

介绍了一种用于纺纱车间的温湿度无线监控系统．以STC89C58RD＋单片机为核心实现温湿度采集和控制．通过无线传输模块PTR2000实现单片机与上位机、单片机与单片机之间的无线通信．针对现实环境中温湿度控制大时滞、非线性、难以精确建模的特点,单片机采用模糊控制算法实现对温湿度的自动控制．系统具有良好的适应性和稳定性,操作简便,较好解决了纺纱车间对温湿度要求高、人工调节不便的问题．  相似文献   

论9．11之后的美国学校公民教育     

陈平 《外国教育研究》2007,34(10):66-70

美国学校的公民教育历史悠久,且深入人心。在9.11事件之后,美国学校公民教育的特点主要表现为:深化爱国主义的内涵,寻求国民身份共识;联邦与州政府通过立法、立项,加强对学校公民教育的管理与支持;学校注重围绕公民知识、公民技能、公民气质,进行综合培养与训练。  相似文献   

“9．11事件”之后美国高等教育国际化的四个趋向   总被引：1，自引：0，他引：1  

李联明 《外国教育研究》2007,34(5):52-54

"9.11事件"的发生,对美国高等教育产生了深远影响。在其后的几年时间中,美国高等教育国际化表现出对赴美留学国际学生签证和学科加以限制、学生赴海外留学目标国家多元化、划拨专款加强外语教学和围绕恐怖袭击开设敏感性区域研讨性课程等趋向。  相似文献   

实验室环境温湿度无线监测系统设计     

冯达  张震坤  余轩  廖媛敏 《实验室研究与探索》2012,31(2):22-25,49

为了实现实验室试验环境温湿度的实时监测、多点无线测量、自动记录等功能,设计了一种实验室温湿度无线监测系统,并介绍了该系统的工作原理和硬件结构,分析了软件流程。该系统由无线单片机芯片CC1110和温湿度传感器SHT11构成数据采集端和发送模块;由CC1110、FLASH存储器、液晶显示、串行接口等电路构成数据接收模块,并与计算机连接。计算机监控程序负责处理接收模块传来的数据,并将其存储到数据库SQL Sever;通过监控画面显示实时数据和随时间变化的趋势曲线;检测员可通过计算机监控程序随时调用环境温湿度历史数据。经过实际应用证明,该系统性能良好,具有稳定、精度高、操作方便等特点。  相似文献   

The role of educational quality and quantity in the process of economic development     

Amparo Castelló-Climent  Ana Hidalgo-Cabrillana 《Economics of Education Review》2012

We develop a theory of human capital investment to study the effects of school quality on student choices of education, and to understand its effect on economic growth. In a dynamic general equilibrium closed economy, primary education is mandatory but there is an opportunity to continue to secondary education and beyond. High-quality education increases the returns to schooling, and hence the incentives to accumulate human capital. This is caused by two different channels: higher quality makes education accessible to more people (extensive margin), and once individuals decide to participate in higher education, higher-quality increases the investment made per individual (intensive margin). Furthermore, educational quality determines human capital composition and growth. Cross-country data evidence shows that the proposed channels are quantitatively important and that the effect of the quality and quantity of education on growth depends on the stage of development.  相似文献   

“十一五”时期教育系统干部培训工作的主要经验、困难与问题     

严加红 《成人教育》2012,32(8):4-7

“十一五”时期教育系统干部培训工作有了较大发展,不仅提升了质量水平,而且积累了工作经验,但也存在困难与问题.文章阐述了“十一五”时期教育系统干部培训工作的主要经验,分析了其实践中所遇到的困难与问题,这对做好“十二五”时期工作规划、计划及其实施具有参考价值与借鉴意义,并有助于更进一步推进此项工作的科学持续发展.  相似文献