三维层叠微带天线的FDTD模拟(英文)

借助Maxwell方程组,将时域有限差分法应用于实验室研制的新型层叠式微机械微带贴片天线的建模和分析,并根据数值模拟结果讨论了天线的特性参数。根据实际情况,灵活地给出了各边界的近似吸收边界条件,有效地减少了存储空间和计算时间。     

试论钱学森关于发展农业的思想

钱学森对中国现代农业的发展提出了许多真知灼见,即农业发展要以系统工程理论为指导;要依靠现代科学技术进步;发展农业型知识密集产业,以提高农业生产的效率和效益;在发展农业时,要注意环境保护等,这些高瞻远瞩的建议对指导中国农业的发展和解决“三农”问题有很强的现实指导意义。     

相对论Birkhoff系统的积分不变量

研究相对论Birkhoff系统的积分与积分不变量的构造,建立相对论Birkhoff系统的等时变分方程和非等时变分方程,由此证明:由已知系统的一个第一积分,可以构造系统的一个积分不变量.并给出了它的逆定理。     

专家系统驱动的技治主义运动式治理——基于F市创建禁毒示范城市的转译社会学解释

地方政府的治理创新正在出现一种新的趋势：在“稳中求进”的政治考虑下,结合技术治理与运动式治理以实现特定的目标。借鉴拉图尔转译社会学理论,对F市“创城”过程中专家系统的转译行为进行研究发现,转译行动的实施赋予了专家系统行动者的身份,由此编织起的行动者网络能够实现治理资源的流动并促进治理效能的提升,从而形成技治主义运动式治理。作为技治主义运动式治理范式的“创城”是在转译行动建构下的内部转型与外部适配的过程。此种寓技术治理于运动式治理的范式并非简单的要素叠加,而是受到了专家系统的行动建构,将技术与政治进行了结构性整合,以使其匹配现阶段社会治理的总体目标。现实的合理性与治理的有效性是采取这一模式的根本原因。     

中立型时滞大系统的关联稳定性

对一类中立型时滞大系统,引进了互联矩阵、关联稳定、渐进关联稳定、指数关联稳定等概念,在此之下,利用参数变易法研究此类中立型时滞大系统在结构扰动下的稳定性,获得了一个简单的指数关联稳定性的代数判定准则。     

Design and analysis of variable fidelity experimentation applied to engine valve heat treatment process design

Summary.  When experimentation on a real system is expensive, data are often collected by using cheaper, lower fidelity surrogate systems. The paper concerns response surface methods in the context of variable fidelity experimentation. We propose the use of generalized least squares to generate the predictions. We also present perhaps the first optimal designs for variable fidelity experimentation, using an extension of the expected integrated mean-squared error criterion. Numerical tests are used to compare the performance of the method with alternatives and to investigate the robustness to incorporated assumptions. The method is applied to automotive engine valve heat treatment process design in which real world data were mixed with data from two types of computer simulation.     

Co-creative Leadership: An Integrated Approach towards Transformational Leadership

The classical understanding of team leadership is extremely difficult to sustain in times when complexity and dynamics have risen to such high levels that very few individuals can assimilate them. The success of team leadership requires the ``participation of those already implicated'' in the development and implementation of a solution – and therefore in the leadership process. How can this be achieved practically? It requires a leadership approach that allows each relevant perspective to be included, in a practical way, in the development of a common position, which can then be implemented collectively. Co-creative leadership creates this possibility – a transformational leadership approach that allows an organisation as a whole to adapt to its environment.     

Studying Individual and Family Development: Linking Theory and Research

The predominant theoretical orientation of the majority of scientists studying human behavioral development and family functioning is derived from systems models. These theories are dynamic in their conceptualization and emphasize process and context. To a large extent, the analytic strategies we employ are not consistent with our theoretical assumptions. Analytic methods that focus on moderating and mediating processes rather than main effects, on within‐group variability and the sources of that variability, and on the identification of interrelated patterns of change in individuals, families, and environments are needed for our research results to mirror the complexity of our theories.     

中日家族企业伦理动因差异之辨析

相同文化背景所蕴含的伦理动因(亦即“同质的伦理动因”)在对家族企业发展的作用中也存在着差异,尤以同处儒家家族主义文化背景下的中日家族企业在其伦理动因上的差异最为明显。而这个差异主要又是基于中日家族制度存在的区别和对儒家家族主义的不同解读所造成,使其儒家家族主义在作为中日家族企业的伦理动因上,表现出不同的情形。在中国是以“孝为核心的家族伦理”为特征,在日本是以“忠为核心的家族伦理”为特征,从而对两国的家族企业繁衍带来不同的影响,前者往往“长不大”或“富不过三”,后者往往则反之。通过对中日家族企业伦理动因差异之辨析,有助于我们对此现象的认识。     

The impact of education on third births. A multilevel discrete-time hazard analysis

We propose to use multilevel discrete-time hazard models to assess the impact of societal and individual level covariates on the timing and occurrence of third births. We focus mainly on the impact of educational attainment on third births across 15 European countries. From the analysis in this paper, the effect of education on the propensity to have a third child is found to be negative. This education effect is not significantly weakened by the Nordic countries, but living in Scandinavia does increase the hazard for a third birth.