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衍射声
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  “衍射声”译为未确定词的双语例句
     Limited Diffraction Beams and Its Application
     有限衍射声束的特性及应用
短句来源
     Limited diffraction beams have a large depth of field and thus have many applications such as medical imaging、tissue characterization、material flaw detection and blood flow detection by Doppler method.
     和传统的高斯聚焦声束相比,有限衍射声束具有较大的声场深度,可以用于医学成像、组织定征、材料的无损检测、多普勒血流检测等许多领域。
短句来源
     The theory of this kind of beams and their applications in field of medical imaging and blood flow estimation are introduced.
     本文介绍了有限衍射声束的产生、各方面特性、及在医学成像、血流估计方面的应用。
短句来源
     According to the theory of acoustooptic interaction of normal Bragg diffraction, a chirp acoustooptic surface wave transducer whose central frequecy and working bandwith are 200 MHz and 300 MHz respectively is designed and manufactured on LiNbO 3 substrate.
     根据正常布拉格衍射声光相互作用原理 ,设计并制作了以 Li Nb O3 晶体作为衬底、中心频率为 30 0 MHz、工作带宽为 2 0 0 MHz的倾斜式变周期表面波声光偏转器。
短句来源
     Here,the sound pressure field and particle velocity field of sound diffraction by an elastic spherical shell are studied theoretically.
     以实际应用需求为背景,从理论上分析了平面声波在弹性球壳上的衍射声压场和振速场;
短句来源
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  相似匹配句对
     Diffraction Analysis of SAW
     表面波的衍射分析
短句来源
     Acousto-optic diffraction in waveguides
     光波导衍射
短句来源
     and characteristic values of X-ray diffraction.
     和X-衍射特征值。
短句来源
     Surface Acoustic Wave Motor
     表面波马达
短句来源
     Simple Explanation of Diffraction of Light
     浅谈光的衍射
短句来源
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The diffraction phenomena of the normally incident SAW on acoustic gratings are investigated. The acoustic grating which is comprised of an array of aluminium film stripes was fabricated on the surface of Y-cut LiNbO3 on which the SAW propagates.

本文分析了声表面波垂直入射于声栅时的衍射现象。理论上,应用唯象理论分析了声表面波垂直入射于声栅时,在“薄栅”和“厚栅”条件下的衍射特性。实验上,我们用光学法观察和测量了相应于“薄栅”和“厚栅”两种条件下的声栅衍射现象,得到了一些有意义的结果。例如,衍射声场近场的强度分布、正一级和负一级声的干涉场的强度分布,声栅内及透射后近场的声波波阵面等。还测量了各级衍射声波传播角度随频率而变化的情形,测量了零级和一级衍射声强度随频率而变化的情形。最后,将上述实验结果与应用唯象方法所分析的结果作了比较。

An acousto-optical bistable device based on Bragg diffraction is reported in this pa- per. The acousto-optical crystal is driven by a moving sound wave field. The frequency of the sound wave is controlled by the feedback signal of the system. We have observed and recorded the bistable behavior between input and output intensity for different bias frequencies. The bistable behavior between output intensity and the bias frequency for different input intensities were observed and recorded as well. These experimental...

An acousto-optical bistable device based on Bragg diffraction is reported in this pa- per. The acousto-optical crystal is driven by a moving sound wave field. The frequency of the sound wave is controlled by the feedback signal of the system. We have observed and recorded the bistable behavior between input and output intensity for different bias frequencies. The bistable behavior between output intensity and the bias frequency for different input intensities were observed and recorded as well. These experimental results agree with the theoretical analysis.

本文报导了一种基于Bragg型衍射的声光双稳器件。声光晶体由行波场驱动,声场频率则由系统的反馈讯号控制。实验中,观察并记录了输出光强相对输入光强的双稳特性与固定偏置频率的关系,以及在不同输入光强条件下输出光强与偏置频率之间的双稳特性。这些实验结果与理论分析结果一致。

The microstructure and strengthening toughening mechanism of grey cast iron after wideband laser surface strengthening are investigated.The hardened microstructure is mainly composed of martensite,which features the needle morphology and twin crystal;while the result of the remelting process is fine ledeburite,with the distribution of Fe 7C 3 along the crystal boundaries.The acoustic emission test reveals that the hardened cast iron shows higher toughness than that of the remelted iron.Next,the results above...

The microstructure and strengthening toughening mechanism of grey cast iron after wideband laser surface strengthening are investigated.The hardened microstructure is mainly composed of martensite,which features the needle morphology and twin crystal;while the result of the remelting process is fine ledeburite,with the distribution of Fe 7C 3 along the crystal boundaries.The acoustic emission test reveals that the hardened cast iron shows higher toughness than that of the remelted iron.Next,the results above are discussed with the theory of laser heating.Measures employed include:transmission electron microscope,X ray diffraction,acoustic emission,etc.

采用宽光束CO2 激光,对灰铸铁进行相变硬化和熔凝强化处理,分析了两种工艺条件下铸铁组织强韧化机理.结果表明,相变硬化马氏体形态主要为针状,组织内存在微细孪晶结构;熔凝形成的莱氏体组织内弥散分布着未熔Fe3C及新生相Fe7C3 .声发射试验表明,灰铸铁经相变硬化处理,其强韧性稍优于熔凝处理的结果.结合激光形成的温度场特点,对试验结果进行了讨论.研究方法包括透射电子显微镜、X射线衍射、声发射试验等.

 
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