美国PT3项目特点与借鉴

PT3是美国联邦教育部针对职前教师教育技术培养而启动的大型资助项目。该项目致力于教育技术理论与实践的有机融合,注重发挥合作学习作用,强调过程性评价。这对我国职前教师教育技术培养具有较大的借鉴意义。     

热释电材料的研究现状分析

本文分析了热释电材料的研究现状 ,对比了各种材料的优缺点并着重阐述了PT系列材料的研究方向、方法、研究进展及存在问题。最后 ,对今后的研究提出了自己的看法     

Biological and Biochemical Potential of Sea Snake Venom and Characterization of Phospholipase A<Subscript>2</Subscript> and Anticoagulation Activity

This study is designed to isolate and purify a novel anti-clotting protein component from the venom of Enhydrina schistosa, and explore its biochemical and biological activities. The active protein was purified from the venom of E. schistosa by ion-exchange chromatography using DEAE-cellulose. The venom protein was tested by various parameters such as, proteolytic, haemolytic, phospholipase and anti-coagulant activities. 80 % purity was obtained in the final stage of purification and the purity level of venom was revealed as a single protein band of about 44 kDa in SDS-polyacrylamide electrophoresis under reducing conditions. The results showed that the Potent hemolytic activity was observed against cow, goat, chicken and human (A, B and O positive) erythrocytes. Furthermore, the clotting assays showed that the venom of E. schistosa significantly prolonged in activated partial thromboplastin time, thrombin time, and prothrombin time. Venomous enzymes which hydrolyzed casein and gelatin substrate were found in this venom protein. Gelatinolytic activity was optimal at pH 5–9 and ¹H NMR analysis of purified venom was the base line information for the structural determination. These results suggested that the E. schistosa venom holds good promise for the development of novel lead compounds for pharmacological applications in near future.     

基于PBL与TBL协同效应的本科课堂的组织设计

以问题为基础的学习和以团队为基础的学习虽然强调的教学方法有所不同,但是两者有相互融合的基础。把两种教学方法相结合,发挥两种教学方法的协同效应,会取得更佳的教学效果。将这种结合概括为PT教学模式,即六程式教学模式。六程式教学模式有其明确的运行程式和应用条件。在教学实践中六程式教学模式获得了较好的教学效果。     

基于AVR单片机纸币消毒机系统的设计

对纸币消毒的需求进行分析,设计了一款具有纸币进入自动检测、消毒液自动加液、烘干温度检测与控制、电机驱动与控制等功能的纸币消毒机.对消毒液的液位检测及加液控制,纸币烘干温度检测及控制的软硬件设计方法进行分析.通过实验及样机运行证明系统具有较高的稳定性和实用性.     

Question‐posing and question‐responding: the heart of ‘Possibility Thinking’ in the early years

Drawing on research that sought to explore the characteristics of ‘Possibility Thinking’ as central to creativity in young children's learning, this paper considers question‐posing and question‐responding as the driving features of ‘Possibility Thinking’ (PT). This qualitative study employed micro‐event analysis of peer and pupil–teacher interaction. Events were sampled from two early years settings in England, one a Reception classroom (4‐ to 5‐year olds) and the other a Year 2 classroom (6‐ to 7‐year olds). This article arises out of the second stage of an ongoing research programme (2004–2007) involving the children and practitioners in these settings. This phase considers the dimensions of question‐posing and the categories of question‐responding and their interrelationship within PT. Three dimensions of questioning were identified as characteristic of PT. These included: (i) question framing, reflecting the purpose inherent within questions for adults and children (including leading, service and follow‐through questions); (ii) question degree: manifestation of the degree of possibility inherent in children's questions (including possibility narrow, possibility moderate, possibility broad); (iii) question modality, manifestation of the modality inherent in children's questions (including verbal and non‐verbal forms). The fine‐grained data analysis offers insight into how children engage in PT to meet specific needs in responding to creative tasks and activities and reveals the crucial role that question‐posing and question‐responding play in creative learning. It also provides more detail about the nature of young children's thinking, made visible through question‐posing and responding in engaging playful contexts.     

10kVPT中性点接地线N630未接地异常问题研究

通过对兰岭变电站10kVPT中性点接地线N630未接地典型异常实例进行分析,总结出如果放松安全意识,将给生产、运行造成严重后果,制定出相应的防范措施,实现规范性管理,对电力设备安全运行起着借鉴作用。     

基于单片机C8051F350的温度测量系统设计

以铂电阻PT1000为温度传感器,以C8051F350单片机为控制核心,设计了一种高精度温度测量系统,测量结果以数字方式显示.     

体育实践课放松活动的种类和方法

放松活动对完成教学任务和消除疲劳有积极作用,本文概括介绍一些放松活动的种类和方法。     

PT850采集仪在图书采访中的应用研究

详细介绍将图书馆的馆藏、采访、在编、套录、现采等书目数据整理成PT850-采集仪格式要求的文本数据的原理及方法,数据包括ISBN号、书名、数量,按ISBN号排序;给出用SQL语句卸载数据,用U-NIX的sort命令对数据进行排序、合并及BASIC语言编程对数据进行整合,最终符合PT850-采集仪要求的文本数据inbn.TXT,并讨论其性能。