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《物理实验》1991年3期刊登的《混合液体的折射率》是在一个物理模型的基础上,运用斯涅尔折射定律,通过推导,最后得出如下结果 相似文献
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测节仪与光组基点测定实验教学张和民(西南师范大学重庆,630715)本文扼要介绍笔者为适应教学的需要而研制成功的一种使用方便的多功能,“测节器”——多用测节仪的基本原理、结构及其特点.并从认识论和教育学的角度,介绍了笔者对“光组基点测定”实验的教学组... 相似文献
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一、概述由于人眼不能直接鉴别光的偏振态,学生们因块乏必要的感性知识,常常感到与偏振光有关的概念抽象,规律不易理解。因此,必须通过实验才能使学生获得偏振光的知识,正确理解其规律和学到一些偏振光的实验方法。目前广泛使用的立式偏振光镜(又称偏振计),或在光具座上组装的偏振光实验装置,所能进行的实验项目不够全面,调节也很不方便。我们在教学实践中,研制了一种新型偏振光实验仪,经过多年的使用和改进,现定名为PG-2型偏振光实验仪。其结构紧凑,操作方便,功能全面,实验效果良好,为中国技术进出口公司国际招标公司 相似文献
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Synthesis of coarse-grain diamond crystals is studied in a China-type SPD6× 1670T cubic high-pressure apparatus with high exact control system. To synthesize high quality coarse-grain diamond crystals, advanced indirect heat assembly, powder catalyst technology and optimized synthesis craft are used. At last, three kinds of coarse- grain diamond (about 0.85 mm) single crystals with hexahedron, hex-octahedron and octahedron are synthesized successfully under HPHT (about 5.4 GPa, 1300-1450℃). The growth characters of different shape crystals are discussed. The results and techniques might be useful for the production of coarse-grain diamonds. 相似文献
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Micron grade boron-doped diamond crystals with octahedral morphology are successfully synthesized in a Fe-Ni- C-B system under high pressure and high temperature (HPHT). The effects of the additive boron on synthesis conditions, nucleation and growth, crystal morphology of diamond are studied. The synthesized micron grade diamond crystals were characterized by optical microscope (OM), scanning electron microscope (SEM), x-ray diffraction (XRD) and Raman spectroscopy. The research results show that the V-shaped section of synthetic diamond moves downwards to the utmost extent due to 0.3a wt% (a is a constant.) boron added in the synthesis system. The crystal colour is black, and the average crystal size is about 25μm. The crystal faces of synthetic diamond are mainly (111) face. The synthesis of this kind of diamond is few reported, and it will have important and widely applications. 相似文献
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