Linear combination of derivative weighted composition operators

The relation between composition operators on the Dirichlet spaces in the open unit disk and derivative weighted composition operators on the Bergman spaces in the open unit disk is investigated firstly,and for a combination of several derivative weighted composition operators which acts on classic Bergman space,the lower bound of its essential norm is estimated in terms of the boundary data of the symbols of d-composition operators.Some similar results about composition operators on the Dirichlet space are also presented.A necessary condition is given to determine the compactness of the combination of several derivative weighted composition operators on Bergman spaces.     

探究高中数学教学中“示错情境”的设计与思考

所谓"示错"是一种方式,同样也是提高课堂效率的一种新型的教学方式。而"示错情境"的运用可以让学生在纠正错误的同时提高其认真反思、培养积极思考的能力。本文以XX高中数学公开课的部分设计为例,探究高中数学教学中"示错情境"的设计和思考。     

儒家对“礼”的存在合理性的论证

纵观儒家思想史,对维系社会秩序的"礼"的合理性的论证是贯穿其中的主线。儒家思想家在看到"礼"的规范作用的同时,又看到了"礼"对人的自然本性的束缚。为缓解"礼"与"人性"的这种对立与紧张,他们从理论上做了种种论证。     

汉代博局纹镜的图像象征意义

博局纹镜是汉代铜镜中重要的类型,其中图案上"TLV"纹饰的符号象征意义备受中外学者的关注。图像学的任务是破译和阐释隐藏在视觉象征符号之下的观念。运用图像学的方法,对汉代博局镜中"隐藏在视觉符号之下的观念"进行分析,从而得出博局镜纹饰"法象天地",象征着"天圆地方"宇宙模式的结论,它是汉代人"天人合一"观念在图像上的具体表现。     

高职院校计算机教学改革的探索

随着计算机在各行业的逐渐普及,高职计算机应用基础课程的教学工作遇到新的难题。针对高职各专业计算机应用基础课程的教学特点,提出关于计算机教学模式根据具体情况改革创新的探索。     

研究生教学中高等物理光学授课模式的探索与实践

高等物理光学是一门非常重要的学科,是研究型大学光学和光学工程专业研究生必修课程和基础理论课程。本文针对高等学校物理光学教学现状及存在的问题,探讨了在研究生教学中高等物理光学教学内容、课程设计、教学方法等授课模式方面的改革思路。     

毕节试验区规范性文件对社会管理的作用研究

规范性文件是有权的各级政府及其职能部门依法定职权和法定程序发布的规范社会公民和组织行为的具有普遍约束力的政令,是依法行政的重要依据,在行政管理现实中有十分重要的地位。近十年来,毕节试验区先后出台300余件关于地方经济建设、社会发展等诸方面规范性文件,推动了本区科学发展,维护了本区社会稳定。     

Risk of cardiac rupture after acute myocardial infarction is related to a risk of hemorrhage

Although cardiac rupture (CR) is a fatal mechanical complication of acute myocardial infarction (AMI), to date no predictive model for CR has been described. CR has common pathological characteristics with major bleeding. We aimed to investigate the relationship between the risk factors of major bleeding and CR. A total of 10 202 consecutive AMI patients were recruited, and mechanical complications occurred in 72 patients. AMI patients without CR were chosen as control group. Clinical characteristics including bleeding-related factors were compared between the groups. The incidences of free wall rupture (FWR), ventricular septal rupture (VSR), and papillary muscle rupture (PMR) were 0.39%, 0.21%, and 0.09%, respectively, and the hospital mortalities were 92.5%, 45.5%, and 10.0%, respectively. Female proportion and average age were significantly higher in the groups of FWR and VSR than in the control group (P<0.01); higher white blood cell count and lower hemoglobin were found in all CR groups (P<0.01). Compared to the control group, patients with CR were more likely to receive an administration of thrombolysis [26.39% vs. 13.19%, P<0.05], and were less likely to be treated with primary percutaneous coronary intervention (PCI) [41.67% vs. 81.60%, P<0.05]. The major bleeding scores (integer scores) of FWR, VSR, and PMR were (17.70±7.24), (21.91±8.33), and (18.60±7.88), respectively, and were significantly higher than that of the control group (11.72±7.71) (P<0.05). A regression analysis identified age, increased heart rate, anemia, higher white blood cell count, and thrombolysis as independent risk factors of CR, most of which were major bleeding-related factors. The patients with CR have a significantly higher risk of hemorrhage compared to the group without CR. Risk of CR after AMI is related to the risk of hemorrhage.     

中职语文教学开展“导学研讨、训练拓展”课堂教学模式的探究和思考

"自主、合作、探究"作为适应21世纪教育发展的新型教学理念,将在课堂教学中发挥越来越重要的作用。教育工作者们在多年经验的基础上结合教学实际,探索出具有特色的中学语文"导学研讨、训练拓展"课堂教学模式。本文对该教学模式进行了简要概述,明确该模式包含了"导学预习——检测反馈——互动研讨——训练巩固——拓展提升"五个教学环节;进而结合实际具体分析了在中等职业学校语文教学中实施该模式的优缺点,提出了完善该模式的思考。     

新能源材料与器件专业人才培养方案的探讨

新能源材料与器件专业为教育部2011年新增试点专业,目标是能在新能源材料、新能源器件设计与制造工艺、新能源系统与工程等方面从事研究、设计、应用开发、组织管理和施工工作的新能源材料方面的专门人才。在培养方案中,拓宽专业涉及面,重视专业基础理论的教学,加强实践与理论的结合,高度重视学生自学能力的培养,增强学生的发展潜力和自我选择的范围,以适应新能源材料领域对不同层次专业人才的需求。