A handheld pointer device provides radiation with a directional characteristic relative to its main axis.
一种手持式指向设备，提供相对于其主轴具有方向特征的辐射。
The directional characteristic of microphone is an important factor in the measurement of directional distribution of sound field.
传声器的指向性对声场方向性分布的测量有很大影响。
Various directional filters can be designed according to the directional characteristic of the frequency spectra of gravitational and magnetic fields.
根据重磁场频谱的这一方向特性，可以设计出各种各样的方向滤波器。
It recommends that the calculation of geometrical spreading loss of running trains noise adopt the theories calculation formula or the simplified formula of directional characteristic of dipole.
推荐铁路列车运行噪声几何发散损失计算采用偶极子指向性特性的理论计算公式或简化公式。
Secondly, the nature of the directional function and the characteristic parameters of real defect Outlines are analyzed in theory.
其次，对真实缺陷轮廓的方向尺寸函数及其特征参数所具有的性质进行了理论分析。
According to the characteristic of impulse noise, a novel algorithm for detecting of impulse noise point from images based on directional derivatives are proposed in section four.
在本文的第四部分，根据脉冲噪声的概率分布特点，提出了一种新的去除这类噪声的算法。
It has also discussed the characteristic of control survey of non-directional traverse in urban buildings and concealing terrains and pointed out the practical value and problems of this method.
本文还讨论了无定向导线测量用于城市建筑区及隐蔽地区控制测量的特点，指出这种方法的实用价值和应注意的问题。
The spatial reflected characteristic and spectral characteristic from optical material surfaces were effectively described by the BRDF (Bi-directional Reflectance Distribution Function).
双向反射分布函数(BRDF)有效地描述了材料表面的空间反射特性和光谱特性。
With directional solidification liquid quenching and definite quantity analysis of metallographic, this paper studied the micro solidification characteristic of ZA28.4 alloy.
通过定向凝固液淬试验和金相定量分析，研究了二元ZA2 8.4合金的微观凝固特性。
It has definite directional character and many characteristic parameters.
它有明确的方向性和许多描述它的参数。
In the same geometrical direction of the sample to be registered and its neighboring images, some edge points are first detected as the characteristic points with directional edge-detection operator.
在样本和待配准图像相同几何方向上，先以方向边缘点检测算子检测目标区的数个边缘点作为特征点。
In the same geometrical direction of the sample to be registered and its neighboring images, some edge points are first detected as the characteristic points with directional edge-detection operator.
在样本和待配准图像相同几何方向上，先以方向边缘点检测算子检测目标区的数个边缘点作为特征点。
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