褐藻糖胶测定的影响因素及其提取的优化工艺分析

研究了苯酚-硫酸法和氯化钡明胶比浊法分别测定褐藻糖胶中多糖和硫酸根含量的影响因素，并分析了用正交试验设计法超声波辅助提取工艺的褐藻糖胶，优化提取工艺中褐藻糖胶含量达到36．97％．硫酸根含量达到22．49％。     

Using Computer Assisted Instruction to Compare the Inventive Model and the Radical Constructivist Approach to Teaching Physics

This paper introduces a new way of evaluating instructional strategies by using computers. Two basic theories, instructivism and constructivism, are discussed and critically evaluated in terms of their effectiveness in conceptual learning. Despite the current popularity of constructivism, the radical form of it is criticized in this paper. The advantages and limitations of these two approaches, especially the radical forms of constructivism, are outlined. After borrowing some ideas from other effective conceptual change models, an integrative model for conceptual learning (the Inventive Model) is introduced. Two versions of multimedia physics software are developed by the authors. The first version is based on the Inventive Model and the second version based on a radical constructivist model. The effectiveness of the Inventive Model was compared with the radical constructivist approach and conventional science instruction. Students' log files were analyzed to investigate the nature and the processes of the conceptual change. A conceptual test and a knowledge test were used to compare the groups. The quantitative results showed the superiority of the Inventive Model over the other models in conceptual learning and the superiority of conventional instruction in learning the basic knowledge. The qualitative analysis showed that only the Inventive Model lead to coherent conceptual learning. It was concluded that the process of conceptual change is gradual and continuous. Analysis of students' log files revealed no moments of dramatic change in students' conceptions.     

基于Flash的辅助教学动画设计与实现

随着信息技术的快速发展,课堂教学中运用Flash动画辅助教学手段已成为现代教学的主流。本文阐述了Flash动画的原理,深入探讨了动画在教学中的应用及注意事项,并通过儿童故事《乌鸦喝水》的设计与实现,说明了教学辅助动画的具体实现过程,通过辅助教学与课堂教学相结合的方法,达到了较好的教学效果。     

多媒体辅助教学再探讨

多媒体辅助教学是一项庞大、复杂的动态系统工程.如何使课件、课本、教师、学生、教学内容和教学手段组成一个最佳的结构序列,并充分发挥各自的作用,共同提高教学功效,是我们面临的一项重大而迫切的艰巨任务.文章就当前多媒体辅助教学中出现的诸多误失,提出了一些新的看法和探索思路,以便能够在教学领域与各位同仁一起共同促成多媒体辅助教学的健康运行和深入发展.     

军事地形学辅助教学软件设计与实现

针对当前军事地形学教学中存在的问题,结合信息化条件下对指挥人才军事地形学素质的要求,利用“金字塔模型”、“椭球四叉树索引”等技术构建了数字地球模型。设计了基于三维地理信息系统的辅助教学软件,满足了军事地形学课堂教学和野外训练的需要。     

聚合物纳米复合材料微孔发泡研究进展

综述了几种聚合物纳米复合材料微孔发泡方法和研究进展．分析了纳米材料对聚合物微孔发泡的影响，讨论了纳米粒子在聚合物微孔发泡中的作用机理，并对聚合物纳米微孔发泡材料的研究及应用前景进行了展望。     

Wiki在大学英语写作教学中的应用与实践

Wiki作为一种面向社群的协作式写作系统越来越受到教育工作者的关注,其对大学英语写作教学改革也有着直接的启示.wiki的开放性和协作性有效地弥补了传统英语写作教学中对作文阅读、反馈与修改等提高性措施方面关注不够的缺陷,实践证明,Wiki与英语写作教学相结合,可以充分发挥读、写、改间的交互性、参与性与合作性,对培养英语的写作能力优势明显.因此本文针对当前大学英语写作教学中存在的问题,提出了Wiki在英语写作教学中的应用模式,并进行了实践教学的总结.     

核态沸腾中汽化核心密度的分形分布

本文首先回顾了在核态沸腾传热中影响汽化核心密度分布的几个关键因素,然后运用分形理论讨论了加热壁面微结构和汽化核心密度之间的关系并分析了两个核态沸腾实验中汽化核心密度的数据。一个实验是考察加热壁面在老化过程中汽化核心密度的变化,另一个实验是考察两个不同材料制成的加热壁面上汽化核心密度的差异。实验数据分析结果表明汽化核心密度与最小成核半径之间呈分形关系。不同加热壁面对应不同的分形维数,分形维数是一个定量描述加热壁面状况的参数。     

Metastable state of clindamycin phosphate in cooling crystallization

The metastable state and nucleation kinetics of clindamycin phosphate （CP） in cooling crystallization were studied by metastable zone width （MZW） method and induction time method. By correlating the MZW experi- mental results with temperature, agitation rate and cooling rate, it is found that the correlation result shows good agreement with the change trend of MZW. The critical nucleation parameters were evaluated based on the classical theory of nucleation; both the interfacial tension and the radius of critical nucleus increased with the decrease of rela- tive supersaturation. The effect of supersaturation on the nucleation rate was analyzed. It is indicated that the new phase formation of CP is governed by mononuclear mechanism.     

计算机辅助测试研究

通过分析教学测验和教学评价的理论,讨论了计算机辅助测试的三个方面,即计算机辅助测试类软件、测验的编写、测验的评价。最后得出了测验类软件的制作应注意的问题,以提高测验的科学性和高效性。