超焦距 的英文怎麼說
中文拼音 [chāojiāojù]
超焦距
英文
hyperfocal distance-
According to expert estimation, the disparity in income assignment between the urbane and countryside contribute to the income disparity in our country by 40 %
據專家估算，城鄉收入差距對我國分配收入差距的貢獻率已超過40 % ，城鄉收入差距愈來愈成為社會各界關注的焦點。The conditions for the long distance propagation are discussed in detail. the results are useful in determining the appropriate size of the channel to be preformed and can guide the future research in ultrashort intense laser propagation
首次利用自恰電子空腔效應分析了超短超強激光在低密度等離子體中的長距離傳輸和自聚焦效應，詳細分析了長距離傳輸的條件。Ultrashort intense laser pulse propagation in low - density plasmas and air xiao yuan, doctor of philosophy, 2002 dissertation advised by : lu baida, professor of physics the study of ultrashort intense pulse laser beams in low - density plasmas and air is relevant to a wide range modern application
超短超強脈沖激光在低密度等離子體和空氣中的非線性傳輸是當今強激光與物質相互作用研究的一個重要課題。本論文闡述了超短超強激光在低密度等離子體和空氣中的長距離自聚焦和自導引效應。Emphasized on the influence of planar reflector on focusing beams, the model of immersion focusing ultrasonic field based on focusing beams reflected by planar reflector is given. and it has been studied on immersion testing the cylindrical objects with the single focus transducer, which is available for small - diameter pipelines
分析了平面反射鏡對聚焦聲束的影響，首次建立了超聲聲束經平面反射鏡反射后的聚焦超聲場模型；分析表明，單焦距探頭經平面反射鏡反射后可用於小管道的智能檢測。The choice of lens depends on the size and brightness of the celestial body photographed. lenses ranging from fisheye to super telephoto can all be used
鏡頭的選擇視乎所拍攝天體的范圍大小與光暗而定，魚眼鏡頭乃至超長焦距鏡頭都可派上用場。The laser beam spot evolution and electron density in the guiding range are evaluated with the burn pattern and the measured conductivity. the above results will be useful in ultrashort laser pulse amplification and future research in ultrashort intense laser propagation in plasmas and ionizing gases
以上研究結果對于超短脈沖激光放大技術研究以及超短超強脈沖激光在低密度等離子體和空氣中長距離傳輸和聚焦研究等具有重要的實用參考價值。People usually think that larger telescope will magnify the object more. the magnification is the ratio of the apparent sizes of the object. for example, if the angular size of the object is one arc minute and through a telescope, its apparent size becomes 30 arc minutes, then we say the magnification is 30
很多人以為大型望遠鏡可以把天體放得更大，事實上望遠鏡要獲得很高的倍率是很容易的只要改用較短焦距的目鏡便可以了，但就算是大型望遠鏡，倍率也極少超過500倍，一般都只是使用100至200倍。The wavelet ' s characteristic of focus " varieties make wavelet better analyses ability in the time field and the frequency field. it is a perfect method of analyzing non - steady signal, and it is fit to analysis ultrasonic pulse echo signal
而小波的「變焦距」特性使得小波分析在時域和頻域中都具有良好的分析能力，是一種理想的分析非穩態信號的途徑，適于對超聲脈沖回波信號的分析。分享友人