Annotations and the collaborative digital library: Effects of an aligned annotation interface on student argumentation and reading strategies

Recent research on annotation interfaces provides provocative evidence that anchored, annotation-based discussion environments may lead to better conversations about a text. However, annotation interfaces raise complicated tradeoffs regarding screen real estate and positioning. It is argued that solving this screen real estate problem requires limiting the number of annotations displayed to users. In order to understand which annotations have the most learning value for students, this paper presents two complementary studies examining the effects of annotations on students performing a reading-to-write task. The first study used think-aloud protocols and a within-subjects methodology, finding that annotations appeared to provoke students to reflect more critically upon the primary text. This effect was particularly strong when students encountered pairs of annotations presenting different viewpoints on the same section of text. Student interviews suggested that annotations were most helpful when they caused the reader to consider and weigh conflicting viewpoints. The second study used a between-subjects methodology and a more naturalistic task to provide complementary evidence that annotations encourage more reflective responses to a text. This study found that students who received annotated materials both perceived themselves and were perceived by instructors as less reliant on unreflective summary strategies than students who received the same content but in a different format. These findings indicate that the learning value of an annotation lies in its ability to provoke students to consider and weigh new perspectives on the primary text. When selected effectively, annotations provide a critical scaffolding that can support students’ critical thinking and argumentation activities. Collaborative digital libraries and applications for the Web 2.0 should be designed with this learning framework in mind.     

陆相碎屑岩储层隔夹层成因、特征及其识别

陆相储层隔夹层是形成储层流体流动非均质的主要因素之一，也是储层精细表征的重要内容，油田勘探开发实践表明，陆相储层隔夹层主要可分为泥质隔夹层、钙质隔夹层和物性隔夹层三大类。根据这种分类，深入分析和总结了这三类隔夹层成因、岩性特征、分布特征和测井识别特征，并比较其区别，这对以后新老区块隔夹层研究有参考和适用价值。     

紫外法测菜籽饼粕中硫代葡萄糖甙操作探讨

对用紫外法测菜籽饼粕中硫代葡萄糖甙过程中测试条件、操作质量等操作问题予以分析和探讨，以求提高测试结果的准确率。     

科技写作课教学规范化的探讨

对科技写作课教学现状进行了分析，对教学规范化的目的、意义、实施步骤与应采取的措施进行了探讨。     

网络环境下计算机信息安全分析

随着网络信息技术的不断发展,人们对于网络信息的需求与依赖性逐渐增强。然而,网络在带给人们便利的同时,也带来了很多的不安全因素,主要表现在信息泄露、信息篡改、非法占有网络信息与网络资源等。因计算机信息安全隐患的存在,个人、企业遭受"攻击"的计算机信息安全事件时有发生,并造成了巨大的经济损失。因此,加强网络环境下的计算机信息安全管理工作就显得很有必要。本文就网络环境下计算机信息安全问题展开探讨。     

用聚丙烯粉料代粒料制塑料扁丝的探讨

概述了以聚丙烯粉料部分代替传统的聚丙烯粒料来生产塑料编织袋扁丝的新工艺，分析了捏合速度、挤出温度、弓板加热温度等因素对扁丝性能的影响。     

煤焦油加工技术的探讨

煤焦油曾为近代有机化工作出了历史性贡献。我国煤焦油资源丰富,但尚未得到有效和合理利用。根据高温煤焦油的组成特点,对煤焦油的初馏、沥青加工利用和煤焦油产品的深加工技术进行了探讨,提出一些建议。此外还讨论了煤焦油加工企业的发展模式。     

A dynamic analysis of the interplay between asynchronous and synchronous communication in online learning: The impact of motivation

With the increased affordances of synchronous communication tools, more opportunities for online learning to resemble face‐to‐face settings have recently become available. However, synchronous communication does not afford as much time for reflection as asynchronous communication. Therefore, a combination of synchronous and asynchronous communication in e‐learning would seem desirable to optimally support learner engagement and the quality of student learning. It is still an open question though, how to best design online learning with a blend of synchronous and asynchronous communication opportunities over time. Few studies have investigated the relationship between learners' actual use of synchronous and asynchronous communication over time. Therefore, this study addressed that relationship in an online course (N = 110), taking into account student motivation, and employing a dynamic inter‐temporal perspective. In line with our assumptions, we found some support for the expected association between autonomous motivation and engagement in asynchronous and synchronous communication, be it restricted primarily to the first course period. Also, positive relations between engagement in synchronous and asynchronous communication were found, with the strongest influence from using asynchronous to synchronous communication. This study adds to the knowledge base needed to develop guidelines on how synchronous communication can be combined with asynchronous learning.     

数显仪表在生产中的抗干扰措施探讨

着重分析了在生产中使用数显仪表干扰产生的原因，列举了抗干扰的措施和在生产实践中取得的成绩。     

鲁奇型低温甲醇洗工艺探讨

通过对鲁奇型低温甲醇洗装置运行的经验总结，提出了对低温甲醇洗工艺的新认识。概括论述了低温甲醇洗工艺的合理性和鲁奇型低温甲醇洗装置的工艺及运行特点，认为低温甲醇洗在煤制合成氨工艺中的应用是成功的。