有方向性的

In Chapter 2, a simplified analytical model is presented for the analysis of the BVI mechanism, adopting the Beddoes' prescribed wake model. By this model, the azimuthal location and miss-distance of the BVI and the radiation directivity of the BVI noise are calculated and discussed, and some conclusions are obtained.

在第二章，使用Beddoes预定尾迹模型，建立了一个用于旋翼桨-涡干扰特性机理分析的简化数学模型，分别对旋翼桨-涡干扰位置、桨-涡干扰距离和声辐射方向性等进行了计算和分析，得出了有意义的结果。

A series of theoretical and experimental studies on the microstrip patch antennas with dielectric superstrates is carried out systematically. Firstly, a comprehensive survey of the microstrip antenna technology and its theories are presented. Then, two analysis techniques, named as the spectral domain Green's function method and the spectral domain integral equation method are developed. The SDGF method is a simplified analysis technique, which takes advantage of the spectral domain immittance approach to find the dyadic Green's function for the stratified media, and obtains the complete closed-form formulas for radiation patterns, directivity, efficiency, gain etc. Some interesting calculated results are presented. The SDIE method is capable of determining resonant frequency, radiation characteristics, input impedance etc, for the covered microstrip patch antennas. Comparing with other full-wave analyses it reduced computation and mathematical labour remarkably. The singularities near the pole location of the surface-wave modes and the difficulty of the integral computation over infinite range of oscillating integrands are dealt with actively and documented well. Results predicted by the SDIE method agree extremely well with our experimental results for resonant frequencies of various superstrates. The superstrate effects on impedance and radiation characteristics also have been investigated experimentally so that the gap due to lack of measured data and computed results for multi-layered superstrate has been filled to some degrees and two useful observations have been achieved for weakening the resonant frequency shift and optimizing the microstrip antenna gain. As a meaningful application, the design and analysis of a 4×4 patch array are introduced.

实用微带天线普遍加介质覆盖层来防护热，物理损伤和环境影响，也可能在飞行或严酷气候条件下自然形成覆盖层本论文对带介质覆盖层的微带贴片天线系统地作了一系列理论和实验研究首先，对微带天线技术和理论作了全面的综述然后，发展了两种分析方法，称为谱域格林函数法和谱域积分方程法SDGF法是一种简化的分析技术，它利用谱域导抗法来求得分层媒质的并矢格林函数，并得出方向图、方向性系数、增益等参数的完整的闭式公式，给出了一些令人感兴趣的计算结果SDIE法能确定介质覆盖微带天线的谐振频率、辐射特性和输入阻抗等与其它全波分析方法相比，它明显减小了计算量和数学工作量已有效地处理了表面波模极点附近的奇异性和对振荡的被积函数的无限区间积分计算的困难对于不同覆盖层情况下的谐振频率，由SDIE法所预示的结果与我们的实验结果吻合得很好对于覆盖层对阻抗和辐射特性的影响也已作了实验研究这在某种程度上填补了缺少实验数据和计算结果之间的间隙，并得出了缓解谐振频率偏移和优化天线增益的两点有用的结论作为有意义的应用，介绍了一个4×4元矩形贴片天线阵的设计和分析。

Fascial plexus also think there is a direction, the direction of the flap design has great significance.

还认为筋膜血管丛有方向性，其方向性对皮瓣的设计有很大意义。

Then the new methods are applied to extract slub, which is the directional feature of fabric images. Instead of the past extracting method, in which the slub is regarded as fabric defects, slub is regarded as a texture feature. A more suitable Gabor filter is designed.

然后将新方法应用到织物图像的方向性特征—竹节纱的提取上，本文的方法不同于以往将竹节看作织物图像疵点的提取方法，而是将竹节看作一类纹理特征，设计更具有针对性的Gabor滤波器。

Clinical significance of detection of retrobulbar blood circulation in diabetic patients by Ultrasonography

超声波具有波长短、有方向性、能量集中且强度大、振动剧烈的特点。

The regression equations between fabric mechanical properties and the evaluation on seam puckers at different directions are established, which may serve as a guide for designing fashion shape and apparel manufacturing.

分别建立面料性能方向性与缝缩率方向性以及主观评价值之间的回归预测方程，对合理选择面料丝缕方向进行服装造型设计及制作有指导意义。

Model QS-350 This machine is of horizontal disc type airflow crusher, and the whole crushing process is comprised of air compressor, air storage tank, air freezer and drier, model QS-350 airflow crusher, cyclone catcher and dust collector is ejected into the crushing chamber by means of high speed ejection flow formed by high pressure air through charging ejector, and the crushing nozzle outside ejects high speed air flow into the crushing chamber at a certain direction, making the material severely collided and frictionated therebetween and thus crushed.

QS-350型为水平圆盘式气流粉碎机，整个粉碎流程由空压机、储气罐、空气冷冻干燥机、QS350型气流粉碎机主机、旋风捕集袋及吸尘器等组成。该机是靠高压气体通过加料喷射器所形成的高速射流，使粉碎原料被射人粉碎室，粉碎室外围的粉碎喷嘴，有方向性的向粉碎室喷射高速气流，使物料间产生激烈的碰撞，摩擦而获得粉碎。

It is possible that domes or long walls may be created independently in the horizontal strata. Thus, synclines and anticline develop in different extent and may be distributed in space with different directions. Nevertheless, some of them may be arrangeddirectionally. Shown in the figure on the right

穹窿或长垣可以弧零零的产出于水平岩层之中，所以向斜和背斜不同等发育，而且空间展布常无一定方向性；有些穹窿或长垣也可稍呈有规律的定向排列。

Practices have substantial theory have directionality and purpose to instruct.

实践有了充实的理论作指导更有方向性和目的性。

An efficient edge must have following features:(1) gray mutation,(2) being the boundary of adjacent regions,(3) being of directionality.

一个有效率的边缘，必须有以下特点：（ 1 ）灰色突变，（ 2 ）边界毗邻地区，（ 3 ）具有方向性的矢量？

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。