本文中讨论的光子能带结构是由非常有效的矢量波多重散射方法计算,该方法可以精确地处理介电函数在界面附近的突变。
The photonic band structures are calculated by an efficient vector-wave multiple scattering method which can deal accurately with the sharp changes of dielectric functions near the interface.
利用球矢量波函数的定义及性质,提取出场的径向分量,将初级场分解为相对于径向的TE波和TM波,避免了复杂的矢量微分运算。
Using the definition and character of vector function, the field is separated to TM wave and TE wave relative tor without complex vector-differential operation.
本文用半波带法对夫琅禾费光栅衍射进行分析该方法和常用的振幅矢量法相比,分析衍射条纹的位置更要快捷,明了。
The authors show that using the half-wave strip method to deduce the bright and dark fringe conditions of Fraunhofer grating diffraction is simpler than the amplitude vector method.
三分量反射地震的本质是三维矢量反射波场。
The essence of three component seismic reflection is three dimensional vector reflection field.
在未知阵列响应矢量的条件下,利用信号的多普勒信息,估计出期望信号的波达方向。
The Doppler frequency of signals was used to estimate the direction of arrival (DOA) of desired signal with unknown array response vector.
在使用矢量网络分析仪对射频吸波材料进行测试的过程中,由于矩形同轴装置阻抗不匹配,将引起不希望有的反射。
In the process of measuring radio frequency absorb material by vector network analyzer, the impedance of rectanglecoaxial measuring device is mismatched and cause redundant reflection.
文中使用小波变换来对人脸的高维图像矢量进行压缩,并设计了一个支持向量机分类器系统来识别人脸。
This article utilizes the wavelet transform to compress the high dimensional face image vectors, then devises an SVM classify system to recognition the face.
阐述如何利用地震台观测得到的地倾斜矢量图对固体潮半日波进行潮汐导纳分析。
The tide admittance analysis for the semidiurnal wave of the earth tide by use of the vector pattern of ground tilt observed at seismostations is expounded.
本文讨论了极化电磁波在随机介质中多次散射,传输和热辐射的斯托克斯矢量的辐射传输理论。
The radiative transfer theory of Stokes vectors is developed to study multiple-scattering, propagation, and thermal emission in random media.
本文对目前流行的各种方法进行了归类,主要思想有:边缘保持、矢量量化、小波变换、插值核、分形技术以及边缘模型。
And this paper classifies the popular methods, the main ideas are as follows: edge preserving, vector quantization, wavelet transform, interpolation kernel, Fractal technology and edge model.
提出了一种应用小波变换提取分类特征的基于支撑矢量机的通信信号调制识别方法。
A new method of modulation identification for communication signals, using wavelet transform to extract characteristics and based on support vector machines (SVM), is proposed.
目前,小波变换、矢量量化以及嵌入式编码已经成为图像压缩的主要技术及研究热点,越来越受到重视。
Nowadays, wavelet transform, vector quantization and embedded encoding has been the primary technique and study focus for image compression, to which people attach their more importance.
在空间电压矢量形成PWM波的基础上,通过两个零矢量作用时间的不同分配及调节各矢量作用顺序,形成了不同形式的相电压波形。
Based on the method of SVPWM, various forms of phase voltage waveforms are generated by adjusting the duty time of the two zero vectors and the duty order of every vector.
提出了基于小波变换的HSI空间的彩色纹理墙地砖图像的特征提取新算法,得到具有颜色、纹理和尺度融合信息的特征矢量。
A new feature algorithm is proposed based on wavelet transform in HSI space to obtain a feature vector with combining information of color, texture and scale.
为了提高车牌上的字符识别准确率,提出一种结合支撑矢量机(SVM)和小波的字符识别方法。
To improve the recognition accuracy of the characters on car license plate, a novel method based on support vector machine (SVM) and wavelet decomposition was proposed.
并以三相半波可控整流电路、滞环比较方式的电流跟踪控制、利用S函数实现空间矢量脉宽调制为例说明了软件的使用方法。
Three-phase half wave controlled rectifier, hysteresis comparison mode current track control, and realization of SVPWM by S-Function are used as examples to describe the usage of the software.
作者在该文中从世界空间的四维坐标和四维波矢量出发,证明了电磁波的相位不变性。
This article, on the basis of four dimensional coordinates and four dimensional wave vectors of world space, proves the phrase constancy of electromagnetic waves.
在矢量量化和小波变换的结合方面,提出了一种基于视觉特性的小波变换跨带矢量量化压缩编码方案,并通过实验验证了算法的性能;
Based on the former two theories, we propose a wavelet transform cross-band vector quantization based on human vision, and we verify the correction with experimentation.
电磁波的椭圆极化参数描述了电磁波的矢量特性。
The vector characteristics of electromagnetic wave are described with elliptic polarization parameters of the electromagnetic waves.
采用特殊矢量量化编码,叫作小波树矢量量化(WTVQ)编码对每个谱象数据进行压缩,获得较高的压缩性能。
Then a special Vector Quantization, called Wavelet Tree Vector Quantization (WTVQ), is designed to compress the every spectral image data, and a higher compression performance is obtained.
该方法将树型小波中颇纹理能量特征、灰度共生矩阵特征、树型小波滤波后的灰度组成的特征矢量对SAR图像进行分类。
The feature vector is composed of wavelet texture energy features, texture features based on the gray-level co-occurrence matrix and the tone of filtered SAR image by using tree wavelet.
以波的电矢量为例,具体讨论了衰减电磁波的振幅、波长、位相以及衰减波的衰减长度。
For the electric vector of electromagnetic wave. we discussed its amplitude, wavelength, phase, and attenuation length.
控制策略有阶梯波法、载波相移法和电压空间矢量法等。
There are many control strategy, such as stair waveform, carrier phase shift, voltage space vector and so on.
在该编码方案中,运动矢量的获取采用了可变块大小的多分辨运动估计算法,运动估算在小波域中进行。
In the scheme, 2-d motion vectors are obtained by a variable block-size multiresolution motion estimation algorithm and motion estimation is realized in the wavelet domain.
利用全矢量平面波法计算了三角结构的光子带隙型光子晶体光纤的带隙分布。
The photonic band-gap of triangle structure photonic band-gap PhotonicCrystal Fiber (PBG-PCF) is computed by FPWM.
进行矢量量化前,首先对小波系数进行视觉加权,然后采用了同向跨频带的方法将小波系数进行矢量组织。
Before quantifying, the wavelet coefficients should be given a vision weight, and then organized in the way of across different subbands according to the same direction.
详细地讨论了有关调制波的若干参数,如波矢量、波长、幅角、位相等。
Several parameters related to modulation wave, such as wave vector, wave length and argument phase etc.
本文对电磁波在手征介质中的传播进行了研究,利用矢量圆法对传播中介质所表现出的表面阻抗和导纳进行了推导。
This paper studied the characteristics of electromagnetic wave propagation in chiral media, and got the expessions of surface impedance and admittance by use of vector circle method.
这种矢量模式方法物理概念清晰且稳定收敛,可以处理任意偏振态平面波入射到二维亚波长金属光栅中的衍射问题。
Physical idea of the vector method is clear, stable and convergent. The diffraction problem of plane wave with polarization incident upon 2-d sub-wavelength metal gratings can be processed.
这种矢量模式方法物理概念清晰且稳定收敛,可以处理任意偏振态平面波入射到二维亚波长金属光栅中的衍射问题。
Physical idea of the vector method is clear, stable and convergent. The diffraction problem of plane wave with polarization incident upon 2-d sub-wavelength metal gratings can be processed.
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