查询词典 propagation

The propagation modes in the lenslike medium , including the spot size, field distribution pattern and their propagation constant,are obtained by solving the Helmholtz equation in the cylindrical coordinate.

从求解柱坐标内亥姆霍兹方程出发，导出了类透镜介质传导模的特征参量、场分布状态及传播常数，求出了入射激光束和导模之间的耦合系数，并讨论了它们的物理意义。

Since the only propagation place in Xingrentuozi on Shicheng Islands along seashores of Huanghai Sea in China were found in 1999,observation and studies on propagation,hibernation and migration of Platalea minor were conducted,and meanwhile investigation was carried out on some isles along seashores of Huanghai Sea in Liaoning each year.

自1999年在辽宁省黄海沿岸的石城岛形人坨子上发现了中国的唯一繁殖地以来，作者对黑脸琵鹭的繁殖、越冬和迁徙进行了观察和研究，同时每年都对辽宁黄海沿岸的一些岛坨进行调查，在2007年6月又在距第1处繁殖地东南3n mile的元宝坨子上发现了第2处黑脸琵鹭繁殖地。

Exogenous fault mechanics model characterizes wave making vibration propagation process caused by structural defects, defines transmission and reflection property of stress wave during the propagation, and provides theoretical basis for determining and seperating various kinds of polygenetic wave speed, which can be used in inversion and location of structural fault with satisfaction. By comprehensively using the two types of fault model that we presented, this paper has satisfactorily solved the classification and recognition of polygenetic faults of rotary support.

内源性故障力学模型较好地说明了回转支承内部的各种故障的形成和发展机理，描述了故障存在时回转支承的振动激励响应特性，为多源故障信号的分类识别提供了一种理论模型，外源性故障力学模型描述了由结构缺陷引起的波致振动传播过程，解释了传播过程中应力波的传递与反射特性，为各类故障波速的确定与分离提供了理论基础，能较好地用于结构故障的反演与定位。

Results The proper media for protocorm inducing, propagation and rooting were found in this paper, rapid propagation system of I.

结果 通过研究，筛选出了丽江山慈姑原球茎的诱导、增殖及生根培养基配方，建立了丽江山慈姑的快速繁殖体系，实现了大规模的组培生产。

The increment of 6-BA concentration can increase the protocorm propagation obviously. And the matching of high concentration of 6-BA and low concentration of NAA is more suitable for the protocorm propagation of C. grandiflorium. 6-BA at the concentration of 1.5 mg/L was most favorable for protocorm induction and differentiation.

结论］6-BA浓度的增加，可明显提高原球茎的增殖，高浓度6-BA与低浓度NAA的配比较适合大花蕙兰的原球茎增增殖；6-BA在1.5 mg/L时最有利于原球茎的诱导分化。

The 1/2 MS medium supplemented with 1.0 mg·L-1 BA and 0.1 mg·L-1 NAA was very beneficial to the protocorm differentiation and propagation of D.candidum .The highest protocorm propagation index was obtained from the medium containing the activated carbon.The highest root numbers and length were observed in plants growing in 1/2 MS medium containing 0.5 mg·L-1 NAA.

结果与结论：添加20%马铃薯液有利于种胚的萌发，种胚萌发率为79.37%；BA 1.0 mg.L-1和NAA 0.1 mg.L-1最有利于原球茎增殖，培养基中添加2%活性碳原球茎增殖倍数高；NAA有助于试管苗的生根，不同含量NAA以0.5 mg.L-1时试管苗平均根数最多和平均根长最长。

Object To apply the technique of tissue culture to the rapid propagation of Stemona japo-nica Miq. and lay a foundation for the rapid propagation of its improved breeds.

目的 探讨百部的组培快繁技术，为优良品种的快速繁殖奠定基础。

The results show that both norbornenic and cyclopentenic double bonds are involved in the polymerization. The propagation on the NB double bond generates structural unit I by direct addition and unit II by carbocation rearrangement, respectively. Similarly, the propagation on the CP double bond produces structural unit III by direct addition and unit IV by transannular rearrangement, respectively.

结果表明， DCPD分子的降冰片烯双键和环戊烯双键均参与了聚合反应并根据不同链增长机理产生四种链结构单元：通过NB双键的链增长反应可生成直接加成结构单元I和重排结构单元II，通过CP双键的链增长反应生成直接加成结构单元III和跨环重排单元IV。

Instant electric field-induced domain switching, crack initiation and propagation in a poled BaTiO3 single crystal, as well as sustained field -induced indentation crack propagation and 90°domain switching in an unpoled BaTiO3 single crystal have been investigated in situ using optical microscopy.

金相显微镜原位观察了面内极化的BaTiO3单晶在瞬时电场作用下的畴变和裂纹形核、扩展的关系以及未极化BaTiO3单晶在恒电场下Vickers压痕裂纹扩展和电致畴变的关系。

The coarsened structure perpendicular to primary crack plane exhibits better propagation resistance than that parallel with primary crack plane, but it seems that crack propagation property at high temperature can not be improved by changing γ′precipitates morphology.

颗粒形态不会改变裂纹扩展路径及微观机制，粗化结构的疲劳裂纹扩展阻力随温度升高而降低的趋势比原始结构剧烈，同时与主裂纹面垂直的粗化结构具有比与主裂纹面平行的粗化结构更好的疲劳裂纹扩展抗力，但通过改变γ′形态似乎不能改善高温下裂纹扩展性能。

Objective To investigate the effects of interleukin-1 β converting enzyme gene on the biologic characteristics of ovarian cancer cells.

目的 探讨白细胞介素-1 β转换酶的表达，对卵巢癌细胞生物学特性的影响。

Campylobacter: This illness is the most commonly identified cause of diarrheal illness in the world.

弯曲：这种病是最常见的原因查明腹泻病，在世界上。