Full field and microregion deformation measurement of thin films using electronic speckle pattern interferometry and array microindentation marker method

Thin films now are widely used in micro devices and structures, such as MEMS, electronic packaging, micro sensors, and so on. Their performances highly affect the reliability of the devices. Therefore, it is important to investigate the deformation and the failure mechanism of thin films. In this paper, we present two experimental methods to measure the mechanical properties of thin films. In the first method, a double-field-of-view electronic speckle pattern interferometry system (ESPI) and an integrated deformation and load measurement system are employed, which allows in situ and real-time measurements of full-field deformations of the thin films and microforces under uniaxial tensile test. In the second method, the array microindentation markers were indented on the surface of the thin film using a nanoindenter and the microregion deformations of the tested thin films were measured. In the proposed methods, the tested thin films can be made of metals, oxide ceramics, and multi-layer composites of thickness from several tens micrometers to less than a micron, and the tensile loads from 88 μN to 15 N for the first method or up to 100 N to the second one. The underlying principle of the methods and the experimental set-ups are presented. The deformations of Au and Au/Cr multi-layer films, and the pure Ni films are measured. The performance of the methods and the testing systems are also discussed.     

军校学员英语学习习惯与效率的相关性探索

通过对军校学员英语学习习惯进行调查分析,发现学员们在英语学习中表现出的种种习惯差异,后将此差异与他们英语学习的效率进行对比,得出某些英语学习习惯与学习效率之间存在着很强的正相关,而某些习惯与学习效率形成弱相关。因此,教员可在英语教学实践中及时提醒学员改掉不良的英语学习习惯和嗜好,教学管理部门、学员队应该尽可能给学员更多的自主支配时间,并提供更便利的自主学习条件,增强其自制力,鼓励其英语学习朝着个性化的方向发展,提高学习效率。     

泰国留学生阅读有无词界标汉文本的眼动研究

泰国留学生阅读有无词边界标记汉语文本的眼动数据说明:对泰国留学生来说,汉语词语比汉字更具有心理现实性,由插入字边界标记不能对阅读产生促进作用,可以推测泰国留学生阅读汉语时信息加工的基本单位是词;在汉语文本中插入词边界标记能大大提高泰国留学生的汉语阅读效率。建议今后对泰汉语初中级教材排版时,改变现有排版方式,在汉语文本中插入词界标。     

谈分类目录号与分类排架号的分离 --两号分离方法探讨

阐述了分类排架号与分类目录号分离的必要性．从读检索需要及开架借阅的实际出发，提出了分类目录号与分类排架号的设计方案，以及实施两号分离的具体操作方法．     

An Analysis and Prevention of Stop Marks in Weaving

The cause of stop marks of fabrics in weaving is introduced, and the floating displacement of the cloth fell during loom stoppage is a primary cause of stop marks. The stop marks caused by fabric system are analyzed. A new method to eliminate stop marks by using the electronic let-off system is presented. This new method needn't any special detecting equipment, it can control the fell position by the powerful control program, so the cost is decreased greatly. The method is so flexible that can be applied to weaving all kinds of fabrics.     

精加工软铁芯的试验研究(航空仪表 АГК—47Б)

本文对应用精加工代替无心磨削进行了试验研究,解决了软铁芯表面质量问题。经过多次试验,零件表面已去掉了麻点,符合技术要求。     

改进短跑起跑技术教法的研究

通过对实验组和对照组实验前后50m跑的平均成绩比较对照,对结果进行分析后得出结论:改进起跑技术的教法对提高短跑成绩的作用十分明显,能有效地提高短跑成绩。     

数理公式前后标点符号使用的探讨

科技期刊中数理公式前后标点符号使用方面存在着"有的标点多余,有的又缺省"等问题,由此影响了科技论文内容的正确表达.对数理公式前后标点使用常见错误进行分析,有利于提高期刊的编辑质量.     

Virtual three dimensions reconstruction and isoline analysis of human marks on the surface of animal fossils

Animal fossils in archaeological sites are closely related to human activities. The environment and human activities, such as hunting-selection, cook process, traditional culture and habits can be partly inferred from the variety of fauna, fragmentation of the bones, and the human marks on bones’ sur-faces. So far, researches about marks on fossils are few in China, and are mainly observed directly by eyes. Light Microscopes and Scanning Electron Microscopes are also applied to the observation abroad. These...