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Abstract: It is observed that the Sommerfeld's formula for a progressive spherical wave is not covariant with respectro the rotation of the coordinate system.It contains complex partial waves that are not physical.The standing wave representation of the s
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文摘:说明了球面行波的索末菲公式在坐标转动下不协变.证明了球面波的驻波表示是协变的，因而是一个物理的关系式，故适用于圆柱坐标中各类波动方程的定解问题.作为一个例，应用于光纤光学，导出了受导简正模和辐射模的表达式，以及各模式的强度分布. |
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Abstract: It is proposed that the sturdiness of silicic acid congealed gel is a key factor to make the reaction of producing“Lead Trees” successful.The better conditions of preparing silicic acid congealed gel are detemined.The success rate of this oxidat
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文摘:提出了生成“铅树”反应成功的关键是硅酸凝胶的坚固性，找到了较好的硅酸凝胶的制备条件，使该氧化还原平衡移动的反应成功率提高了90％以上. |
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Abstract: It is proposed the opinions on the conditions of lectotype of light rail vehicles, applicability of high floor &low floor vehicles, car body materials, motor power as well as applying of resilient wheels and magnetic track brake etc.
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文摘:对我国轻轨车的选型条件、高地板车和低地板车在我国的适用范围、车体材料、电动机功率、弹性车轮和磁轨制动的采用等，作者提出了自己的看法。 |
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Abstract: It is proved that a small circular aperture has the positive and minus focal distances,and the research experiments for small aperture glasses are introduced concisely.
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文摘:提出了证明小圆孔具有正、负焦距的一种方法，简要地介绍了关于小孔眼镜的实验研究. |
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Abstract: It is shown in this paper that distributions of electric fields in five measuring slots of Uster Evenness Tester,and the errors caused by uneven electric fields were analysed.According to the results of measuring and analysing electric fields,a
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文摘:实测了乌斯特纱线均匀度试验仪上5个电容测量槽的电场强度分布,分析了由测量槽不均匀电场所引入的误差.系统地测试分析了第5号槽误差,获得了几种误差的定量估计.最后给出了正确使用仪器,避免测量误差所应注意的几点结论. |
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Abstract: It is studied that milling time,carbon content,inhibitor and sintering effect on properties of the submicron cemented carbides.
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文摘:研究了球磨时间、碳含量、抑制剂以及烧结对超细硬质合金性能的影响。 |
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Abstract: It is summarized and discussed detailedly the ways and features of quality control in producing mixture with wet millingspray drying process.
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文摘:对湿磨－喷雾干燥工艺混合料生产中的质量控制及其特点做了比较详细的介绍和讨论。 |
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Abstract: It is the fact that more and more prestigious international luxury retailers are finding a fertile market in China; the international real estate developers are favoring China, developing and constructing shopping centers.
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摘要:国际知名奢侈品零售商纷纷进驻中国，国际房地产开发商也瞄准中国，开发建造购物中心。 |
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Abstract: It is the first time to use powder damping technique in reducing the vibration and noise of cold saw clamp.Through measurement and analysls of the noise reduction effects and frequency spectrum, it is found that powder damping is a simple and pr
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文摘:把粉体阻尼技术首次用于冷锯机夹盘的减振降噪，通过对其降噪效果及频谱的测量分析，发现粉体阻尼不但是一种简单实用的技术而且对夹盘的强度和固有特性影响小。 |
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Abstract: It is unavoidable to pollute farm products and environment by using chemicals to control pests.
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文摘:研究表明，使用农药防虫，不可避免地对农畜产品及环境带来污染。 |
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Abstract: It is well recognized that the safety management in enterprises must be strengthened in the course of reformation.
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文摘:在改革过程中，安全工作只能加强，不能削弱，已成共识。 |
