Broken Promises

“Sheesh!Give me a few points for self control!”Isnapped at my cranky husband.I wanted to stop at a sport-ing goods store“Going Out of Business”sale we passed inthe mall.“There's nothing we need”,his usual grumpymale comment.“It's all overpriced junk.If they had anythinggood they wouldn't be going out of business.”     

咨询台

孩子经常便秘,又不爱吃蔬菜,有没有好办法可以调治?于霞合理饮食是调治便秘的最好办法:1.多吃蔬菜、水果。芹菜、韭菜、菠菜等含粗纤维多的蔬菜,促便效果好,可以把蔬菜包成饺子、包子让孩子吃。2.让孩子多喝水,不爱喝水的可以用榨汁机把水果、蔬菜榨出汁,加上蜂蜜、白糖调味后让孩子饮用;早晨起来先让孩子喝杯淡盐水,效果也不错。3.多吃各种豆子、洋葱头、蒜等容易产气的食物,能促进肠道蠕动,也有一定的排便作用。孩子3岁了,平时活泼好动,也不太长病。一次,我为孩子测了测心跳,次数达到120次,反复测最少也是110次,这正常吗?为什么孩子心跳会…     

开罗夜未眠

During the last few years, my neighborhood in Cairo has experienced such an influxof refugees from the Iraq war that longtime residents have begun, with a mixture of     

讲述我们历史教师自己的课程故事——历史教育叙事研究刍议

历史教育叙事研究是一线历史教师通过讲故事和教学反思的途径进行教学研究的一种新方式,可以有效促进一线教师的专业发展。进行历史教育叙事研究,要有敏锐的问题意识,同时要做到叙事的及时性、真实性、经常性和公开性。     

赤水方言的连续变调

赤水市位于贵州省西北端,北面,西面与四川接壤,东面、南面与习水县毗连。据黄雪贞《西南官活的分区(稿)》(《方言》1986年第4期262——272页),赤水方言属于西南官活灌赤片岷江小片。赤水方言内部差异不大,本文所记为赤水城区语音。本文题目是遵义师专中文系语言教研组在学生毕业作业答辩时发现的。发音合作人均为中文系赤水籍学生。     

Effect of boundary conditions and convection on thermally induced motion of beams subjected to internal heating

Numerical exercises are presented on the thermally induced motion of internally heated beams under various heat transfer and structural boundary conditions. The dynamic displacement and dynamic thermal moment of the beam are analyzed taking into consideration that the temperature gradient is independent as well as dependent on the beam displacement. The effect of length to thickness ratio of the beam on the thermally induced vibration is also investigated. The type of boundary conditions has its influence on the magnitude of dynamic displacement and dynamic thermal moment. A sustained thermally induced motion is observed with progress of time when the temperature gradient being evaluated is dependent on the forced convection generated due to beam motion. A finite element method (FEM) is used to solve the structural equation of motion as well as the heat transfer equation.     

自密实混凝土和高性能混凝土在预制法施工中性能的比较研究

在混凝土预制厂中制作挡土墙时，对自密实混凝土(简称SCC)和高性能混凝土(简称HPC)进行了比较，试验表明，SCC某种情况下可以替代HPC。在试验室中进行的性能研究，包括材料的微观结构分析及与之相关的耐久性，尤其突出了一系列系数的测定(渗透性、氯化物的扩散性、碳化程度等)以及分别在有和没有防冻盐两种条件下的抗冻性。试验室条件下的试验结果，显示了SCC抵抗CO2和氯化物转移的良好性能。在研究中，SCC(尤其是BAP3)也显示了比HPC更加良好的抗冻性。     

Stress analysis of anisotropic thick laminates in cylindrical bending using a semi-analytical approach

Semi-analytical elasticity solutions for bending of angle-ply laminates in cylindrical bending are presented using the state-space-based differential quadrature method (SSDQM). Partial differential state equation is derived from the basic equations of elasticity based on the state space concept. Then, the differential quadrature (DQ) technique is introduced to discretize the longitu- dinal domain of the plate so that a series of ordinary differential state equations are obtained at the discrete points. Meanwhile, the edge constrained conditions are handled directly using the stress and displacement components without the Saint-Venant principle. The thickness domain is solved analytically based on the state space formalism along with the continuity conditions at interfaces. The present method is validated by comparing the results to the exact solutions of Pagano’s problem. Numerical results for fully clamped thick laminates are presented, and the influences of ply angle on stress distributions are discussed.