近自由面细长体的振荡问题

本文引进细长体的假定,把三维的流体运动问题化成了二维的非定常问题。前面剖面对后面剖面的干扰作用用积分表示,对物体作了适当近似以后,改善了切片理论。根据物面条件把整个问题的求解分解为兴波问题和振荡问题,而振荡问题可由兴波问题的适当组合表示出来。这样,大大简化了问题的求解。作为例子,本文数值计算了细长体的水动力导数,给出了结果。     

The boundary-spanning role of a cooperative support organization: managing the paradox of stability and change in non-traditional organizations

This project provides an interpretation of how one cooperative support organization, the Nebraska Cooperative Council, discursively functions to help its constituent cooperatives consolidate resources in order to better intersect with organizations in a larger bureaucratic system. In analyzing qualitative data collected through in-depth interviews, surveys, and organizational documents, we found the paradox of stability and change a revealing prism through which to make sense of participants' experiences. We work toward locating and describing how the Council, through its boundary-spanning activities, helps cooperatives manage the paradox of stability and change while protecting their core participatory ideologies. By providing networks of learning, promoting the legitimacy of cooperative forms of organizing, and protecting cooperatives' interests, the Council is an entity helping cooperatives to reconcile their internal requirements for democracy with the external demands of the marketplace.     

托马斯·巴菲尔德眼中游牧民族的边界战略——读《危险的边疆：游牧帝国与中国》

美国人类学家托马斯·巴菲尔德在《危险的边疆：游牧帝国与中国》一书中,从独特的视角出发,将历史主体性给了游牧者,并在此基础上提出了游牧民族＂内部、外部边界战略＂模式,游牧民族根据自身发展情况,从外部边界战略转向内部边界战略,再复归外部边界战略,形成一个战略周期。不管游牧民族选择实施内部还是外部边界战略,都有其自身和中原王朝两方面的原因,为我们重新认识北部边疆提供了新的视角。     

Boundary spanning innovation and the patent system: Interdisciplinary challenges for a specialized examination system

This article discusses the importance of boundary spanning innovation, demonstrates the drawbacks of popular metadata based boundary spanning measures, and proposes a new full text semantic similarity measure of boundary spanning. It subsequently uses the semantic distance boundary spanning measure to demonstrate that boundary spanning innovation has become more common in recent decades, and show that these boundary spanning inventions pose challenges for the traditional specialized-examiner patent examination model. Examining the applications for inventions that span technical boundaries takes longer and requires more back-and-forth with the patent office than their comparatively simple peers. Finally, this article discusses potential reforms to the patent examination system to help address these challenges.     

关于开口弧段上的带根号的Riemann边值问题的探讨

探讨了带次方根的边值问题在一条开口光滑弧线上的解,通过在开口弧线上对未知函数结构的分析,把带次方根的Riemann边值问题化为一般的Riemann边值问题,并给出了它的解和可解条件.     

Quasilinear singularly perturbed problem with boundary perturbation

A class of quasilinear singularly perturbed problems with boundary perturbation is considered. Under suitable conditions, using theory of differential inequalities we studied the asymptotic behavior of the solution for the boundary value problem.     

英语句法问题二则

教学过程中遇到的两则英语句法问题值得商榷。其一,“It was so windy that it was only with a tremendous effort were we able to pitch a tent”一句中的倒装,采取句型转换的方法,运用全息律、结构边界律、转换守恒律等规律,依据传统语法学说,可推断并说明该句中的倒装不仅绝无必要而且应调整为正序。其二,“He progressed very quickly”一句中“progress”一词的运用,从名转动用、正向迁移等角度,可论证“progress”一词在该句中的运用并非词性与词义不统一。而且对名转动用这一客观语言现象,应从其赖以存在的深层机理,亦即其语义基础、语用推理和句法动因等角度作理论上的多维探析。     

船舶二冲程柴油机热力过程仿真研究

文章根据船舶二冲程柴油机换气阶段不同于四冲程柴油机的规律,建立了船舶二冲程柴油机缸内热力过程仿真模型,研讨了模型仿真的边界条件。     

纵横载荷联合作用下弯曲薄板的功的互等定理

本文将功的互等定理应用于形状、大小和材料均相同又处于真实状态的两个薄板系统之间，得出了纵横载荷联合作用下弯曲薄板的功的互等定理，并给出了简洁的数学表达式。该式既可以用于横向载荷作用下弯曲薄板问题的求解，又可以用于薄板稳定问题的求解。定理推导过程中没有对薄板的形状和边界条件加以限制，因而使该定理具有较广的适用范围。     

Quasilinear singularly perturbed problem with boundary perturbation

A class of quasilinear singularly perturbed problems with boundary perturbation is considered. Under suitable conditions, using theory of differential inequalities we studied the asymptotic behavior of the solution for the boundary value problem.