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boundary loss
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  相似匹配句对
     Discussion on Reflection, Transmission and Echo-loss of Ultrosound on the Infinite Boundary
     超声束在大界面上的反射、透射及回波失落问题的讨论
短句来源
     The reflection loss(R.L.)
     材料反射率损耗(R.L.)
短句来源
     ON GEOGRAPHIC BOUNDARY
     论地理边界
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     Plural·Boundary
     多元·有界
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     LOSS AND GAIN
     得与失
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  boundary loss
Formulas are derived for taking account of the boundary loss factor by introducing the effective reflection coefficient of the laser resonator mirrors.
      


Using a "three parameter" bottom loss model, the expression for normalized vertical coherence of sound field in shallow water homogeneous layer was derived. A method was suggested, from which boundary losses at low frequencies and low grazing angles may be obtained for extensive area. From the measurement results, we obtained boundary losses for the frequency band of 0.4-3.15 kHz and grazing angle range of 0.7?5? On the basis of the results of the present work and the information in references...

Using a "three parameter" bottom loss model, the expression for normalized vertical coherence of sound field in shallow water homogeneous layer was derived. A method was suggested, from which boundary losses at low frequencies and low grazing angles may be obtained for extensive area. From the measurement results, we obtained boundary losses for the frequency band of 0.4-3.15 kHz and grazing angle range of 0.7?5? On the basis of the results of the present work and the information in references [9, 10], the frequency dependence of the transition ranges of the average sound field in shallow water can be explained satisfactorily.

在浅海均匀层中,利用三参数海底声学模型,引进声传播有效掠角的概念,推导了声场垂直相关与边界损失等参数的关系;提出了大面积测量低频小掠角海底反射(散射)损失的方法;在0.4—3.15kHz频段内测量了小掠角0.7—15°范围内的边界反射(散射)损失;根据本文结果及有关资料,可以较好地解释浅海平均声场过渡距离随频率的变化。

An improved polycrystalline photoemissive model of multialkali antimonide ph-otocathode is presented and a formula of its photoemissive yield and its computer program are derived. It is concluded that there are two factors in the model: effective grain boundary loss rate and grain boundary barrier height. According to the model, experimental phenomena can be well explained and possible approaches to increase photosensitivity of the photocathodes are discussed.

本文研究了多碱阴极晶粒间界对光电发射的影响,提出了这种多晶阴极光电发射的改进物理模型,并导出了量子产额的公式。利用此模型和电子计算机,使理论与实验的量子产额曲线相符合,从而能够解释此种阴极光电发射的有关特性。文中还讨论了提高此种阴极灵敏度的可能途径。

In present gravity exploration of overthrust nappe, people usually use gravity continuation method, forward gravity modelling method and integrated gravity-seismic interpretation method. These methods have their own merits and limitations respectively. In exploring the overthrust nappe in the west Shanganning basin, the integrated gravity -seismic interpretation method was used in the area where seismic data had been collected, while the gravity continuation method was used in the whole region. In the processing...

In present gravity exploration of overthrust nappe, people usually use gravity continuation method, forward gravity modelling method and integrated gravity-seismic interpretation method. These methods have their own merits and limitations respectively. In exploring the overthrust nappe in the west Shanganning basin, the integrated gravity -seismic interpretation method was used in the area where seismic data had been collected, while the gravity continuation method was used in the whole region. In the processing of gravity data in this region, the continuation formula in the form of Laplace series solution was used, by which less boundary loss and faster computation can be achi- eved. Furthermore, upward continuations with different grid spacings were made. The integrated analysis of the processed gravity data, geo- logical data and other geophysical data in this region lead to the con- clusion that the structure reflected by gravity anomaly at Majiatan section of the north overthrust nappe is the most favourable prospect in the region.

目前,应用重力资料研究逆冲推覆构造,多采用重力延拓法、重力模型正演法和重力、地震综合解释法。这些方法都有其特点和局限。在陕甘宁盆地西部逆冲推覆构造的研究中,对有地震资料的地区使用了重力、地震综合解释法,在全区范围内使用了重力延拓法。针对本区的资料特点,在重力资料处理中采用了边界损失少、计算速度快的拉普拉斯级数解形式的延拓公式,在向上延拓时,还使用了不同的距离。经过对该区处理后的重力资料、并结合其它地质及物探资料的综合分析,表明在该逆冲带北区的马家滩地段,由重力异常所反映的构造是一个最有希望的勘探地区。

 
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