汉语方言中两种差量式差比句使用情况的考察

“A＋比＋B＋W＋Z”和“A＋W＋B＋Z”是两种带比较差值的差比句句式,广泛分布在汉语方言中。本文探讨它们在汉语方言区中的分布情况、交替机制以及竞争状态。和“A＋W＋B”不同,“A＋W＋B＋Z”普遍存留在汉语方言中,其原因有待考察。     

FRP Retrofitted RC Slabs Using Finite Difference Model

Current guidelines recommend using single-degree-of-freedom(SDOF) method for dynamic analysis of reinforced concretec (RC) structures against blast loads, which is not suitable for retrofitted members. Thus, a finite difference procedure developed in another study was used to accurately and efficiently analyze the dynamic response of fibre reinforced polymer (FRP) plated members under blast loads. It can accommodate changes in the mechanical properties of a member's cross section along its length and through its depth in each time step, making it possible to directly incorporate both strain rate effects (which will vary along the length and depth of a member) and non-uniform member loading to solve the partial differential equation of motion. The accuracy of the proposed method was validated in part using data from field blast testing. The finite difference procedure is implemented easily and enables accurate predictions of FRP-plated-member response.     

均布载荷作用下悬臂不可压饱和多孔梁的非线性变形

Nonlinear bending of cantilever incompressible poroelastic beams subjected to a uniform load is investigated with the constraint that fluid flow is only in the axial direction. The governing equations for large deflection of the poroelastic beam are derived from theory of incompressible saturated porous media. Then, nonlinear responses of a cantilever beam with impermeable fixed end and permeable free end are examined with the Galerkin truncation method. The deflections and bending moments of the poroelastie beam and the equivalent couples of the pore fluid pressures are shown in figures. The differences of the results between the large deflection and the small deflection theories are analyzed. It is shown that the results of the large deflection theory are smaller than those of the small deflection theory, and the time needed to approach their stationary states for the large deflection theory is shorter than that for the small deflection theory.     

单片机在缓冲器中的应用

介绍了单片机对电机旋转速度进行测试和对缓冲器进行控制,并对频压转换进行了分析,详细地介绍了单片机在缓冲器的应用过程中的软、硬件的设计过程。     

用平衡力解决压强问题的策略

利用平衡力解决力学问题,是学生学习的一个难点,主要存在问题是:对象确定不准、受力分析不全、找不准平衡力,也就很难正确求出未知量.因此帮助学生总结出解决问题的策略     

线段a·b=c·d±e·f型的证明

正确的几何题求证思路,是学生证明复杂的几何题的关键.本文论述了线段和、差法和线段分段法.并举例论证了用线段和、差法和线段分段法证明形如a·b=c·d±e·f型的较复杂几何题.文章对开阔学生证明较复杂的几何题的思路,促进教学都有一定的作用.     

化学中的压强应用

化学是一门研究物质的组成和结构、性质和变化、用途和制法的学科.在物质中当然不乏气体,而气体的存在,就脱离不了压强.可以说,化学中压强     

也谈“物浸压变”

"物浸压变"是指物体浸入液体时,引起液体对容器底部的压力和压强的变化.这类试题具有知识密度大、难度较高、灵活性强、有较强的区分度等特点,因此经常出现在中考压轴题中,同学们一看到这类题,就感到头疼、束手无策     

传感器与检测技术课程整合教学模式研究

本文提出了一种全新的传感器与检测技术课程教学模式——整合教学模式,将教学目标、教学方法与现代信息技术进行有机整合,明确了在该模式下进行网络课程建设的基本原则。     

姥姥,您一定要等我长大

<正>岁月从您的额头、眼角碾过,碾出了一道道深深的痕迹;岁月从您的背上压过,压出了一座弯弯的小桥;岁月从您的手上磨过,磨出了一层厚厚的老茧。在苦难的洗礼中,您变得愈加坚强。