高等代数教材改革初探

本文从高等代数教学中存在的问题出发,先分析了高等代数教材的现状,再探讨了高等代数教材改革的指导思想,最后给出了高等代数教材内容编排及处理的设想。     

Mesozoic thrusts and extensional structures in the Daqingshan orogen, Inner Mongolia, and their temporal and spatial relationship

Three large-scale thrusts developed in the Daqingshan orogen, Inner Mongolia, with a northeast-east trending from Louhuashan to Suletu are described in this paper. These northwest-directed thrusts, together with the four tectonic belts (or tectonic sheets) separated by these faults, formed a typical thrusting system. The originally defined Hohhot metamorphic core complex may be a tectonic sheet, making the uppermost tectonic unit of the thrusting system and truncated by the Daqingshan detachment fault on top. The existing tectono-chronological studies showed that the thrusting of this region possibly happened at the same time as the extension along the top detachment fault. This presents that the contraction and extension in Daqingshan orogen were probably simultaneous. The structural pattern of the Daqingshan orogen can be correlated to the Himalayan orogen, and models for simultaneous thrusting and detachment in Himalaya may give a hint for explaining the development of the Daqingshan orogen.     

"敢闯新路"是井冈山精神的内核

1927年9月,在秋收起义遭受挫折的情况下,毛泽东审时度势,毅然将部队带上了井冈山。他这勇于开拓的精神,在以后井冈斗争岁月里不断发扬光大,升华为伟大的井冈山精神。“敢闯新路”是井冈山精神的核心内容,对今天仍有十分重要的现实意义。     

磁芯螺线管微电感的计算机模拟

采用电磁场理论建立了FeNi磁芯螺线管微电感的物理模型,并对交流载荷下的微电感进行了模拟.通过与磁芯厚度为10、20、30和40μm的微电感的实验结果对比,表明该物理模型能够较准确地模拟磁芯螺线管微电感的主要损耗,进而可计算微电感的电感量和品质因子.模拟结果与实验符合较好.     

一个改进的决策信息系统求核算法

通过刻画决策信息系统的核属性,为张文修等学者的著作中关于决策信息系统的核属性集与其可辨识矩阵中单元素集相等的结论补充了证明.然后,针对该著作中给出的基于可辨识矩阵的求属性核算法具有较高的计算复杂性,文中提出了一种改进的决策信息系统求属性核算法,并证明了它的正确性.改进后算法的计算量随决策信息系统不协调程度的增加而减少.     

提升城市核心竞争力的品牌集群形成和发展模型

提出了提升城市核心竞争力的品牌集群的形成和发展模型,分析了培养品牌集群的关键要素,对品牌集群的发展阶段进行了分类。     

历史名城的品牌文化建设及其核心竞争力的提升

历史名城作为众多城市当中的"经典著作",它所背负的历史和它所包含的深邃的文化,将是城市核心竞争力的一个重要砝码。品牌文化建设就是建立起体现历史名城自身所特有的,具有代表性的文化。品牌文化建设将对历史名城的健康快速发展,城市核心竞争力的提升有着重要的促进作用。     

纺缍形α-Fe2O3/聚苯乙烯复合高分子微球的制备、表征及等电性研究

以纺缍形α-Fe2O3超微粉为内核，过硫酸钾为引发剂，聚乙二醇为分散剂和稳定剂，乙醇／水为分散介质，苯乙烯为单体，用改进的分散聚合法合成了核／壳型纺锤形的高分子微球，并用XRD、TEM和IR进行了表征。粒子的分散性较好，粒径分布窄。由于亲水性的α-Fe2O3与亲油性的苯乙烯亲合性较差，在实验中采用了超声分散、预先溶胀和预先吸附引发剂、分散剂的方法，增强了粉末表面的亲油性，合成的高分子微球，其长轴平均为0．26μm，短轴平均为0．09μm，轴比为2．9，同时测定了不同pH值时粒子包膜前后的Zeta电位值，并根据粒子等电点的变化计算出包膜厚度，与电镜照片的结果比较吻合。     

我国区域经济与区域市场的发展

随着经济的发展,我国区域经济差距进一步拉大,既有体制和政策原因,又有各个地区自身因素.要解决这一问题,需要大力发展区域市场.首先要扫除体制障碍;其次要明确中央和地方的权利和义务,要真正做到政企分开,消除地方保护主义,实现区域开放;最后,要充分发挥企业的主动性,提高企业核心竞争力.     

40Ar-39Ar ages of the Louzidian-Dachengzi ductile shear zone near Chifeng,Inner Mongolia and their tectonic significance

The Louzidian normal fault occurs as the eastern detachment fault of the Kalaqin metamorphic core complex. Field observations and microstructural analyses reveal that the Louzidian-Dachengzi ductile shear zone developed in its lower-plate was genetically related to sinistral strike-slips and extensional faulting. Two samples from this ductile shear zone yield 40Ar-39Ar plateau ages of 133 Ma (Bi) and 126 Ma (Kp), which are concordant with their isochron ages. The plateau age of 133 Ma (Bi) records the formation age of the ductile shear zone. The inconsistent relationship between the earlier strike-slip ductile shear zone and the later normal fault makes the Kalaqin Quasi-metamorphic core complex distinctive from Cordilleran metamorphic core complex. These ages provide important geochronological data for putting constraints on the formation age and genesis of such ductile shear zones.