无方向的

The contourlet transform used in the system was constructed by dual tree complex wavelet transform followed by critically subsampled directional filter banks, sub-bands energy and standard deviations were cascaded to form feature vectors, and the similarity metric was Canberra distance. The performance of retrieval system was compared including original contourlet transform, non-subsampled contourlet transform, semi-subsampled contourlet transform and CCT under the same system structure.

该系统采用的复数轮廓波变换由双树复小波变换级联临界下采样方向滤波器构成，特征向量采用子带系数的能量和标准偏差连接而成，以Canberra距离为相似度度量标准；比较了基于同样架构的基本轮廓波变换、无下采样轮廓波变换、半下采样轮廓波变换和CCT纹理检索系统的性能。

The contourlet transform used in the system was constructed by dual tree complex wavelet transform followed by critically subsampled directional filter banks, sub-bands energy and standard deviations were cascaded to form feature vectors, and the similarity metric was Canberra distance.

该系统采用的复数轮廓波变换由双树复小波变换级联临界下采样方向滤波器构成，特征向量采用子带系数的能量和标准偏差连接而成，以Canberra 距离为相似度度量标准；比较了基于同样架构的基本轮廓波变换、无下采样轮廓波变换、半下采样轮廓波变换和CCT 纹理检索系统的性能。

Study the effect of excipient on famotidine with differential thermal analysis;2. Pharmaceutical Excipients:Regulation and Development;3. It is briefly introduced about the characteristics, granulating process, excipient s and prospect of nonsugar granules of TCM.

主要介绍了中药无糖颗粒剂的特点、制粒技术、辅料和发展前景，重点介绍了辅料中的甜味剂，提出了该剂型目前存在的不足与今后的发展方向。

Because it influentes the masticate function seriously、affects the face shape and brings tremendous of sufferings, the patients request to be repaired urgently.

临床上我们常采用全口义齿来对无牙颌患者进行修复，良好的固位和稳定是获得全口义齿良好修复效果的关键，是修复的重点和难点，同时也是近年来人们所研究的方向。

The speed estimation without speed sensor is an important trend of modern AC drive. This thesis has probed several primary algorithm of speed estimation and analyzed emphatically the algorithm of speed estimate based on model reference adaptive system. The results of simulation prove its feasibility.

无速度传感器转速估计是现代交流传动研究的一个重要方向，本文在探讨了几种主要的转速估计方法之后，着重分析了基于模型参考自适应系统的速度辨识算法，并通过仿真证明了该方法的可行性。

Based on the aberration theory of AWG, a new-type flat-field AWG is designed. The focal signals of all wavelengths of operation are focusing along a straight line perpendicular to the propagation direction. Three stigmatic points restrain three dominant geometry parameters. Furthermore, a new-type flat-field wavelength router with both flat input field and flat focal field is also designed.

基于阵列波导光栅的像差理论，利用三个无像差点约束三个主要结构参量，设计了新型平场聚焦阵列波导光栅，使得所有工作波长的输出信号都聚焦在与光束传输方向垂直的直线上，并进一步将其拓展为同时具有平输入场和平聚焦场的新型平场波长路由器。

In person, I have, people I have to open up the high spirit of innovation, companies continuously adjust the direction of scientific research and production enterprise products industry has always been at the forefront of pesticide synergist, its products become the first choice for the majority of pesticide companies to help agent.

本着人无我有、人有我高的开拓创新精神，公司不断调整科研与生产方向，使企业的产品始终处在农药增效剂行业的前沿，其产品成为国内大多数农药企业的首选助剂。

During the development of dental germ, enamel matrix proteins secreted by epithelial root sheath could induce dental follicle cells to differentiate towards cementoblast and form acellular cementum finally on the surface of tooth root. Many researches of domestic and oversea scholars suggest that enamel matrix proteins could effectively induce periodontal regeneration, and the structure and function of this regenerated tissue are similar to healthy periodontal tissue. Moreover, the regeneration process is nearly the same to that of embryonic development of periodontal tissue.

自发现釉基质蛋白可诱使牙囊细胞向成牙骨质细胞方向分化并在根表面形成无细胞性牙骨质以来，国内外学者做了大量研究，结果表明釉基质蛋白能有效诱导牙周组织的再生，且这种再生组织的结构和功能更接近于健康的牙周组织，并且再生过程也与牙周组织的胚胎发育过程类似。

The Passive Optical Network based on Asynchronous Transfer Mode combines the ATM technique with the PON technique, so it can support different services and has the capability to transfer information from service network interface to user network interface changelessly.

基于异步传输模式的无源光网络结合了ATM的多业务多比特率支持能力和PON的透明宽带传送能力，其光纤入户模式是宽带接入技术的发展方向。

Firstly , we introduce the basic theory of the coding and decoding of the channel which describe the possibility of the errorless transmission in the channel existing interference .

首先从信道编码的基本定理入手论述了在有干扰存在的信道上进行无差错传输的可能性，这是纠错编码研究的理论依据与努力方向。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。