上海世博会英国馆外伸展触须的疲劳强度试验

 介绍上海世博会英国馆的外伸展亚克力杆件的疲劳强度试验和杆件固定支撑处的防 水涂料疲劳试验, 通过试验方法和成果介绍, 可以将这些有益的经验与同仁分享和交流.     

Simple design flow injection PMMA acrylic sample cell for nitrite determination

A polymethyl-methacrylate(PMMA)acrylic sample cell using flow injection is developed in this research for the determination of nitrite in an aqueous media.The research focuses on exhibiting direct absorbance spectrophotometry of nitrite using concentration of samples ranging from 0.1078 to 1.725 ppm.Nitrite determination is done colorimetrically using the Greiss reagent method.This method is based on the reaction of nitrite with sulphanilamide acid and N-1-napthylamine(NED)utilizing diazo coupling,and a syringe is used to administer the nitrite solution.The sample cell being used possesses a diameter of 1mm with an overall size of 7.35×22 mm2.To gauge the direct absorbance,a wavelength range from 400to 650 nm has been selected for the testing,and the maximum absorbance is found to be at 545 nm.The validity of the proposed cell is explained in this letter.     

刮擦全息透射成像的研究

针对刮擦全息在透射成像方面的缺失,先提出了基于几何光学的理论解释,然后对两面刻有不同划痕 的亚克力板进行了一系列成像实验,从而验证了理论的正确性. 通过将刮擦全息透射成像与反射成像进行对比,指 出了二者在理论和实验上的异同. 接着给出了透射成像修正系数的较精确推导,推导过程反映出了板材对透射成 像的影响. 最后,指出了刮擦全息透射成像的实际利用价值及其对进一步完善刮擦全息技术的重要作用     

力臂演示仪

初中物理杠杆一节中的力臂概念是教学中的难点,如何突破这一难点,一直是教师们亟需解决的问题.为此我们在准备参加"全国大学生物理教学技能展评"训练中摸索出一种能让学生自己动手制作的"力臂"教具,该教具使学生对力臂概念有了直观的了解,突破了力臂这一难点,达到了良好的效果.1制作材料亚克力板材1块(大约80cm×80cm),钢锯条1根,细线若干,重物,砝码,割刀,铁架台2个,小钉1个,