Evaluation of Teacher Perceptions and Potential of OpenOffice in a K–12 School District

Through this mixed-method evaluation study the authors investigated a pilot implementation of an open-source productivity suite for teachers in a K–12 public school district. The authors evaluated OpenOffice version 3.0 using measures identified by the technology acceptance model as predictors of acceptance and use of technology systems. During a four-week trial period, teachers rated the usefulness and usability of OpenOffice 3.0 and Microsoft Office. Results from quantitative measures and participant interviews revealed common perceptions of the software applications as well as common problems encountered by users. Based on these findings, implications and recommendations for larger scale implementations within a K–12 educational institution are discussed.     

Examining Student Digital Artifacts During a Year-Long Technology Integration Initiative

This study was situated within a year-long, statewide technology integration initiative designed to support technology integration within science, technology, engineering, and math classrooms. It examined the elements used in student artifacts in an attempt to investigate trends in digital artifact creation. Among several conclusions, this examination highlighted areas of significant improvement in student use of technology, such as an increase in the creation of PowerPoint presentations and the inclusion of multimedia elements. The study also highlighted areas for improvement, such as the low cognitive demand for content in the majority of the artifacts.     

John Eggleston 1926-2001

In a collaborative classroom, teachers combine their strengths to work together, coach one another, and provide the best possible environment for their students. Similarly, peer coaching provides educators with a chance to utilize a natural support system at their school. When peer coaching is used in conjunction with collaborative teaching, it enhances teacher improvement and student learning by providing ongoing opportunities for educators to share their unique knowledge bases and expertise, allowing exploration of new ideas and expansion of professional skill repertoires.     

Racism and Stereotypes in Electronic Media

This article discusses how racial, ethnic, and sexual stereotypes find their way into electronic media, both television and games. This article is presented here to help librarians understand the ethnic, racial, and sexual biases that are built into electronic communication and the importance of thoughtful media literacy analysis in watching over the electronic media that come into their collections and programs.     

维生素的营养学研究

维生素是维持人体生命和正常人体生理机能不可缺少的营养素之一.它能调节机体物质代谢,保证机体各项生理功能,但是它在人体内不能合成或合成量甚微,不能满足机体需要,因此必须从食物中摄取.根据维生素的溶解性质,可将它分为脂溶性与水溶性两大类,其中水溶性维生素包括VB群、VC及PP等,脂溶性维生素包括VA、VD、VE、VK.本文就维生素性质、营养学研究、供给量及来源做一全面综述.     

骨质疏松、维生素K和运动

运动可以通过多种途径来增加骨无机盐密度，但激烈的有氧运动也对骨密度产生负面影响。大强度有氧训练可影响下丘脑-垂体-性腺轴，月经周期变得不规则或停止。它与训练强度，热能限制，心理应激有关。低血雌激素浓度对骨有多种作用，特别是尽管仍有高水平运动，骨密度降低。维生意K缺乏时骨钙蛋白的钙结合能力下降及影响骨代谢。     

运动与维生素E

在长时间、大强度的运动中 ,机体内源性自由基产生增多 ,这对保持生物膜的完整性和酶的生物活性是十分不利的。维生素E的主要生理功能是清除体内自由基、保护生物膜和促进疲劳的恢复。本文通过查阅文献资料 ,对维生素E对抗过氧化、清除自由基的机制进行分析总结 ,了解维生素E对运动的影响以及运动中维生素E的变化 ,以便为合理补充维生素提供依据。     

基于FPGA的简单CPU设计

FPGA是现场可编程门阵列(Field Programmable Gate Array)的简称。本文以简单实用的16位CPU的设计为例，介绍了Altera公司的ACEX 1K嵌入式现场可编程门阵列器件的自顶向下设计方法．给出了ACEX 1K嵌入式可编程器件在Max plus Ⅱ环境下对16位CPU的仿真实现。     

核束缚能效应对夸克分布的影响

根据核Drell-Yan过程的高能强子h同原子核A碰撞和高能轻子l同原子核A深度非弹性碰撞的实验数据,再考虑核子束缚能效应,计算并确定了价夸克分布函数RVA(xt)和海夸克分布核效应函数RSA(xt),深化了对原子核内夸克分布受核效应影响的认识.     

大肠癌P21、P53蛋白表达和K-ras基因、p53基因突变研究

采用免疫组化技术和PCR-SSCP技术对高、中、低分化大肠腺癌、癌旁粘膜、正常粘膜及大肠腺瘤型息肉的P21、P53蛋白表达和K-ras基因、p53基因突变进行了检测,检测结果高、中、低分化大肠腺癌、癌旁粘膜、正常粘膜和大肠腺瘤型息肉六组P21蛋白表达阳性率分别为57.5％、62.5％、75％、13.3％、6.7％、50％,p53蛋白表达阳性率分别为30％、37.5％、50％、4.4％、22％、33.3％,K-ras基因突变率分别为32.5％、37.5％、62.5％、2.2％、0％、16.7％,p53基因突变率分别为22.5％、25％、37.5％、0％、0％、0％.结果表明大肠腺癌P21、P53蛋白表达比大肠腺瘤增多,但增加不显著(P>0.05), 二组均比癌旁粘膜和正常粘膜P21、P53蛋白表达阳性率高(P<0.01);大肠腺癌K-ras基因和p53基因突变率比大肠腺瘤、癌旁粘膜和正常粘膜组显著增加(P<0.01);高、中、低分化大肠癌各组中,随恶性程度增加,P21、P53蛋白表达增加,K-ras基因和p53基因突变率增加,但均不显著(P>0.05).说明K-ras基因、p53基因突变及其蛋白表达产物P21、P53在细胞癌变、癌细胞恶性表型维持中起重要作用。