特殊分块矩阵的Jordan标准形及应用

Jordan标准形是矩阵分析中一类重要的标准形。利用数学归纳法,证明4种特殊分块矩阵的Jordan标准形,并且应用所得的结果证明两个矩阵Kronecker积的特征值所对应Jordan块的个数及其阶。     

Intensive mode delivery of a neuroanatomy unit: Lower final grades but higher student satisfaction

In 2011, Macquarie University moved to a three‐session academic year which included two 13‐week sessions (traditional mode) and one seven‐week session (intensive mode). This study was designed to compare the intensive and traditional modes of delivery in a unit of undergraduate neuroanatomy. The new intensive mode neuroanatomy unit provided the same quantity and quality of material to the same standard, delivered by the same teachers and over the same total hours, but in a shorter timeframe. All students enrolled in session 2 (traditional mode) and session 3 (intensive mode) were invited to participate in this study. The main outcome measures were the final course grades and level of satisfaction with the course. Although there was no significant difference between the two cohorts in self‐rated level of knowledge (P = 0.148), the traditional mode cohort achieved significantly higher final grades compared to the intensive mode cohort (P = 0.001). Similarly, the distribution of final grades was also different between the two cohorts. The two cohorts were equally satisfied with the unit overall, and with the lectures and tutorials. However, the intensive mode cohort was more satisfied with the laboratory practical classes compared to the traditional mode cohort (P < 0.001). Thus this study demonstrates that in the case of neuroanatomy, which is high in content, when the course is taught to the same standards as exist in the traditional mode of delivery, the students do not do as well even though they enjoy the course equally. Anat Sci Educ 6: 286–293. © 2013 American Association of Anatomists.     

基于分块颜色和形状特征的图像检索

针对图像检索中单一特征检索的不足,提出一种结合分块颜色特征和形状特征的图像检索方法,用空间局部信息增强全局颜色特征,采用分块颜色直方图提取图像的颜色特征,利用Hu不变矩提取图像的形状特征,以分块颜色和形状作为综合特征,采用相应的相似性度量方法进行图像匹配．实验结果证明了该方法的可行性,适用于基于区域或对象的图像检索．     

块复合矩阵之块特征值的若干性质

特征值问题的研究一直以来都是数学矩阵方面的重点课题,从而块复合矩阵的块特征值领域的研究也颇具系统。通常的特征值问题是块复合矩阵之块特征值的一种特殊形式。因此,块特征值问题的研究起到了十分重要的作用。讨论块复合矩阵之块特征值的若干性质,同时系统地研究块复合矩阵特征值及其本身相关的一些基本性质和特点。还研究了一类特殊块复合矩阵A和B可换的条件,并加以证明。     

BP Group and CAS institute to co-establis an energy lab in Dalian

The CAS Dalian Institute of Chemical Physics （DICP） and BP Group will join efforts to set up an Energy Innovation Laboratory （BP-DICP ElL） at DICP. The agreement for the new initiative was signed by DICP Director ZHANG Tao and BP Group Vice President Tony Meggs on 5 December, 2007 in Dalian.     

PEO-PPO-PEO嵌段共聚物的聚集行为及其在胶团萃取中的应用

从分子水平研究了PEO-PPO-PEO嵌段共聚物聚集过程中分子基团微环境和构象的变化.FTIR光谱给出了温度、溶剂、嵌段共聚物组成等影响PEO-PPO-PEO嵌段共聚物胶团结构的定量信息。用无机盐和脂肪醇调控PEO-PPO-PEO嵌段共聚物聚集,荧光光谱技术提供了降低PPO链段与水的相互作用,推动嵌段共聚物在水中胶团化的证据。用水凝胶包埋PEO-PPO-PEO嵌段共聚物,实现了萃取水中低浓度多环芳烃的工艺循环。     

中国印刷图书文化的源与流

印刷术的发明有很深的渊源,并且有一个不断积累的由量变到质变逐渐完善的长期过程,其间很难划分出鲜明的分界时限。根据古代文献,结合近年来的考古实物发现综合考证,可以得出雕版印刷术产生于隋至初唐之际的结论。公元7世纪前期的佛像雕印是雕版印刷术的最初形式;8世纪大量出现的经咒印本标志着雕版技术已有长足的进步;9世纪图文并茂的整部佛经《金刚经》印本说明雕版印刷术已臻成熟。     

区块链技术在网络舆情风险管理体系的应用研究

[目的/意义]挖掘弹性管理和区块链理论在网络舆情风险管理体系建设的应用价值,克服传统管理体系的技术弊端,突破现有网络舆情风险管理的难点和痛点,提高网络舆情风险管理效率。[方法/过程]基于网络舆情风险管理、弹性管理理论,确立网络舆情弹性风险管理的理论框架,进而应用区块链技术提出网络舆情风险管理系统体系,并对网络舆情风险识别和感知智慧分类账本、风险关联树以及智能合约进行详尽阐述。[结果/结论]构建的舆情风险管理系统、区块链数据保障系统体系,及应用区块链技术的网络舆情风险识别和感知智慧分类账本、风险关联树、智能合约,使得舆情风险管理数据更安全、数据可追溯、组织弹性适应性更强,能有效指引有关系统开发,并增强网络舆情风险管理可控性、提高网络舆情风险管理效率。     

体医融合项目的风险治理:一种新的面向与选择——从非典到新型冠状肺炎谈起

体医融合和非医疗健康干预可以有效促进疾病管理与健康服务模式的形成,但体医融合项目治理初期仍然受到理念融合、体医融资、部门协同等因素的影响。该文以病毒、人体免疫与体育运动的体医融合关系视角,依据共生理论对体医融合项目的风险治理逻辑进行了阐述。采用文献资料法、数理统计法等对体医融合项目风险治理的相关个案进行了整理,并基于NVIVO11.0质性分析软件对体医融合个案进行识别分析,构建了体医融合项目风险治理的影响因素评价指标体系,包括13个一级指标30个二级指标。最后提出了体医融合项目风险治理的路径选择:(1)将体医融合理念提升至构建公共卫生保障体系战略的高度;(2)落地变现体医融合项目购买方案;(3)打造政府精准购买体医融合项目区块链。     

电子电路的分块分析

本文讨论用拓扑和分块的方法求得大电子网络函数。将图分块后,用Coates图分析各子块并求得各子块的网络函数,用码表示;然后根据代码的特征将各子块合成,得到整个网络的输入与输出间的网络函数。