摘要：图形组织者是一种能够表达文本组织作用的视觉表示。本研究考察视频呈现学习材料的形式下,图形组织者线索对多媒体学习的影响。研究采用单因素两水平(线索;非线索)组间设计,使用先验测验筛选出先验知识低的被试,并将其随机分为两组进行学习和测验。结果发现,在迁移测验的成绩上,线索组和非线索组无显著差异,在保持测验上,线索组和非线索组有显著差异,线索组的回忆量显著高于非线索组。研究认为,图形组织者发挥了线索的信息组织功能,帮助学习者有效组织学习材料,同时也减轻了学习者的认知负荷,因此,以图形组织者为线索能够有效提高学习者对多媒体学习材料的识记。Graphic organizers are visual representations that express the organization of text. This study examines the impact of graphic organizer prompts on multimedia learning in the form of video-presented learning materials. This study used a one-factor, two-level (cued;non-cued) between-group design. Subjects with low prior knowledge were screened out by pretesting and randomly divided into two groups: learning and testing. The results showed that there was no significant difference between the cued and non-cued groups in the transfer test, but there was a significant difference between the cued and non-cued groups in the retention test, and the recall cued group was significantly higher than the non-cued group. Research shows that graphic organizers play the information organization function of clues, help learners to organize learning materials effectively, and also reduce the cognitive burden of learners. Therefore, using the graphic organizer as a clue can effectively improve the learner’s memory of multimedia learning materials.

摘要：面向彩色图像边缘提取问题,引入具有多维统一表达特征的几何代数理论,利用几何基编码实现了对彩色图像颜色空间和特征空间的集成表达与相互映射;利用几何代数空间中颜色空间和特征空间的整合表达,构建了图像的特征描述和相应的运算算子;根据饱和度相对光源亮度值的不变特性,基于饱和度算子实现了彩色图像的颜色特征描述;设计了基于反射算子和几何积的颜色向量相似性度量算子;利用Clifford卷积实现了融合亮度信息与饱和度信息的彩色图像边缘提取.本文提出的彩色图像边缘提取算法可兼容标量模板和向量模板,并可支撑基于阈值的边缘提取特征约束.案例研究表明,论文的边缘提取方法在提取边缘结果的结构保持性和信息完整性上都具有较为明显的优势.

摘要：特殊功能的无机材料合成工艺的实现必须借助于特定的装置。该文探讨常规无机合成以外的液相诱导合成方法,介绍了大分子液相诱导无机合成的机理,以及实现该合成工艺的实验装置的设计及应用。