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The present paper uses the direct sequence spread spectrum technology, key to short-wave communication and direct sequence spread spectrum correspondence characteristic as well as union advantage, wide frequency code production, the direct sequence spread spectrum communications system technology and the principle, the wide frequency synchronization technology, the RAKE receive technology has conducted the research and the analysis.

本论文采用直接序列扩频技术，重点对短波通信与直接序列扩频通信的特点以及结合的优点，扩频码的产生，直接序列扩频通信系统的技术与原理，扩频同步技术，RAKE接收技术进行了研究与分析。

Using the huygens' principle, the modules revise the spread of forest fire spread model, and predicts the purpose of the forest fires and the spread of the main laws.

通过修改成熟的蔓延模型进行林火蔓延模拟达到模型预测的目的，并反映林火蔓延的主要规律。

The article incorporates Huygens' principle with existing fire behavior models of surface fire spread, crown fire spread, fire acceleration, builds forest fire simulation models which fit to Anning's terrain, and develops related dynamic modules for Yunnan Province. The experiment explores the spread of forest fires based on the Yunnan's special topography simulation.

利用惠更斯原理进行林火蔓延模拟，结合国际上成熟的林火行为模型（Rothermel的地表火模型，Van Wagner的树冠火蔓延模型，McAlpine的林火加速模型），建立适合云南省特殊地形的林火蔓延动态模型，并开发相应的动态模拟模块，在云南特殊地形地貌上的林火蔓延模拟做出一定探索。

This thesis mainly discuss following issues, Theory and simple expressions for array covariance matrixes are derived when angular spread functions are symmetric distribution functions, i. e. the Uniform distribution, the Gauss distribution, the Laplace distribution and the Von Mises distribution, and a non-symmetric distribution function, i. e. the Gamma distribution. And the relation between the effective signal subspace and the array number, or and the nominal angle of the distributed source, the angular spread, the distributed functions, and the Signal-to-Noise Ratio is gained. The dimension of the effective signal subspace increases with increment of the array number. And it is more obvious to the non-symmetric distribution. The dimension of the effective signal subspace decreases with increment of the nominal angle. And the distributed source is equal to a point source as θ=π/2. The dimension of the effective signal subspace increases with increment of the angular spread.

本论文针对阵列信号处理中广泛存在的分布源现象，主要讨论了以下问题：推导了角度分布函数分别为对称的均匀分布、高斯分布、拉普拉斯分布、Von Mises分布和非对称的伽马分布时，分布源阵列接收信号协方差阵的严格模型和简化模型，得到了单个分布源的有效信号子空间随阵元数、分布源中心角、分布角、角度分布函数和信噪比的变化规律：随着阵元数的增加，对所有角度分布函数的有效信号子空间维数也随着增加，且非对称分布函数的有效信号子空间充满整个空间的可能性更大；随着分布源中心角逐步增加，有效信号子空间维数逐步减小，当θ=π/2时，等价于点源情形；随着分布源分布角逐渐加大，有效信号子空间维数也随之增加，直到有效信号子空间充满整个空间；随着信噪比的增加，有效信号子空间维数有一定程度的减少。

Simulation results show that the method can detect the period of DS spread spectrum signal and produce the primitive polynomial of the spread spectrum code sequence under the conditions that the length of receiving signal is small than one spread spectrum period.

仿真结果表明该方法能够在接收信号长度小于一个扩频码周期的情况下检测出直接序列扩频信号的扩频码周期和产生扩频码序列的本原多项式。

Histopathologically, bronchoaleolar cell carcinoma can be separated into two basic morphologic types—mucinous and Clara cell or type II pneumocyte—and two spread pattern types—tumors with aerogenous spread and those without aerogenous spread.

在组织病理学上，支气管肺泡癌分为两种基本形态学类型——粘液细胞和Clara细胞或II型肺泡上皮，两种蔓延方式——肿瘤沿气道蔓延和非气道蔓延。

Histopathologically, bronchoalveolar cell carcinoma can be separated into two basic morphologic types—mucinous and Clara cell or type II pneumocyte—and two spread pattern types—tumors with aerogenous spread and those without aerogenous spread.

在组织病理学上，支气管肺泡癌分为两种基本形态学类型——粘液细胞和Clara细胞或II型肺泡上皮，两种蔓延方式——肿瘤沿气道蔓延和非气道蔓延。

With the wider use of modern electronic war, the technology of anti-jamming communication becomes the sticking point of military command and fight. Because hybrid DS/FH spread spectrum communication systems combine the good features of both direct sequence spread spectrum and frequency hopped spread spectrum , they increase the interference rejection capability of the systems and are regarded as the most lifeful anti-jamming communication systems in the world.

随着现代电子战的广泛应用，抗干扰通信技术成为保证军事指挥和作战的关键，由于混合直接序列扩频/跳频扩频通信系统将直接序列扩频技术与跳频技术结合，集中了直接序列扩频体制和跳频体制的优点，提高了系统的抗干扰能力，成为国内外公认的最富有生命力的抗干扰通信系统。

Among the changes: creating more sub-stages for tumor size, reassigning some large tumors to a more advanced stage, reclassifying tumors that have spread into the fluid surrounding the lung, and recognizing that spread to certain lymph nodes is more dangerous than its spread to others.

方案变动包括，对肿瘤体积进一步分级，将一些大型肿瘤列入晚期，对已扩散到肺部周围液体的肿瘤重新分类，并认定肿瘤扩散至某些特定淋巴结比扩散至其他淋巴结更危险。

Violence crime desire that the spread of violence culture has stimulated social members directly, have reduced people's restrain psychology to act of violence; The spread of violence culture becomes, social members imitate the act of violence and study the technical ability of the crime, demonstration teaching material, the spread of violence culture twists the ...

暴力文化的传播直接刺激了社会成员的暴力犯罪欲望，降低了人们对暴力行为的抑制心理；暴力文化的传播成为社会成员模仿暴力行为，学习犯罪技能的示范教材，暴力文化的传播扭曲异化了社会成员的价值观念，使青少年养成残忍冷酷的性格特征。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。