Two-grid method for characteristisc mixed finite-element solutions of nonlinear convection-diffusion equations

A two-grid method for solving nonlinear convection-dominated diffusion equations is presented. The method use discretizations based on a characteristic mixed finite-element method and give the linearization for nonlinear systems by two steps. The error analysis shows that the two-grid scheme combined with the characteristic mixed finite-element method can decrease numerical oscillation caused by dominated convections and solve nonlinear advection-dominated diffusion problems efficiently.     

关于匀速圆周运动带电粒子在远区辐射电磁场的讨论

依据电磁场的基本理论,分析和讨论了匀速圆周运动带电粒子所激发的辐射电磁场的特性以及向外所辐射的电磁能量的分布特征。     

薄壁高墩刚构桥的动力特性分析

以一座薄壁高墩刚构桥为研究对象,根据其墩高及薄壁的特点,运用通用有限元软件ANSYS对其建立三维有限元动力计算模型,对该桥最大悬臂施工阶段和成桥阶段的动力特性进行计算分析,获得了大桥的自振频率和振型,为该类桥梁的抗风、抗震设计研究提供了分析的基础.     

从"个体生命意识苏醒"到"个性迷失"——当代文学三十年"人"的个性发展脉络

新时期以来,中国文学和文艺学展开了对文革时期人性禁锢的批判性反思,个体生命意识开始走向历史的前台;90年代以后的个性发展在经历了群体意识的退场之后则再度走向了从解放到迷失的自我异化之途,演绎出了苏醒-发展-迷失的文化/审美逻辑。     

多模叠加态光场的等幂次N-H最小测不准态

文章根据多模压缩态理论,对强度不等的非对称两态叠加多模叠加光场的等幂次N-H最小测不准态出现的条件进行了详细分析与讨论,从而得出:(1)在qN的积取偶数时,若各对应模的强度及初始相位都相等,态恒处于等幂次N-H最小测不准态;(2)当各对应模的强度和初始相位不等,但在一定条件下,态亦可处于等幂次N-H最小测不准态.     

对高等学校广告专业教育问题的再思考

针对目前高等学校广告教育存在的一些问题,论述广告教育要培养出“管用”人才不仅要依靠教育界自身在师资、教学实践平台、学生的学习方式以及教学管理制度与教育研究机制等方面的改革,更要依靠作为检验人才合格与否的广告业界从教学、实践到聘用整个过程的积极合作和参与。     

2维液晶中向错线的拓扑结构

Using φ-mapping method and topological current theory,the topological structure of disclination lines in 2-dimensional liquid crystals is studied.By introducing the strength density and the topological current of many disclination lines,it is pointed out that the disclination lines are determined by the singulaities of the director field,and topologically quantized by the Hopf indices and Brouwer degrees,Due to the equivalence in physics of the director fields n(x) and -n(x),the Hopf indices can be integers or half-integers,representing a generalization of our previous studies of integer Hopf indices.     

A fragile autonomy in a performativity culture? Exploring positions in the recontextualising field in a Norwegian rural municipality

Internationally, the autonomy of schools and teachers is under pressure. In Norway, recent policies emphasise output control through national testing, combined with holding schools and teachers accountable for students’ results. Whereas recent research documents that the autonomy of schools and teachers is weakening in Oslo, there is little research on the rural parts of Norway. Recent political intentions aim to improve the results by establishing a better learning environment and classroom management. These intentions are related to the regulative discourse, ‘the rules of social order’, which is crucial to control as it dominates the instructional discourse. Two different projects were implemented in a rural municipality. Analysing their positions on three levels (author, actor and identity) this study finds considerable autonomy from the state in the pedagogic recontextualising field. However, this autonomy may be fragile as the teachers seem to have surrendered personal values. If teachers are disciplined, then the state may effectively reduce the potential discursive gap by reducing the autonomy of key agents in education. Investigating teachers’ rationalisations is imperative if we are to understand the relations between interests, ideology and class, and thereby the potential for autonomy in the recontextualising field in a performativity culture.     

高等院校畜牧兽医专业驻场教学实习面临的挑战与解决途径探析

为了做好高等院校畜牧兽医类本科生的驻场教学实习工作,落实本科教学人才培养方案,为畜牧兽医行业储备更多优秀人才,文章对高等院校畜牧兽医专业本科生驻场实习的现状及解决途径进行了简要分析,以供借鉴与参考。     

某地下发电厂围岩稳定性有限元分析

在大量采集的数据基础上，应用有限元计算结果，对某地下发电厂扩建的可靠性，提出锚杆加固的建议，以保证地下厂房围岩的稳定性。