查询词典 spectral

The properties of fermion causal Green's function is discussed according to the theory of spectral representation.

本文叙述了对称型GaAs-GaAlAsP双异质结激光器偏振特性的实验研究，分析了这种半导体激光器的模式竞争过程。

The influence of different soil spectral line on plant canopy and greenness assessment was discussed.

讨论了不同土壤光谱线对绿度及植被覆盖度估计的误差。

The microstructure of an uvarovite sample was analyzed using SEM methods. Tiny quartz and chromite inclusions, calcite filling in microfractures and grossularite that forms a solid solution with uvarovite were discovered in the sample. This demonstrates that the uvarovite of eastern Tibet is of skarn origin. The spectral characteristics of the uvarovite were investigated using UV-VIS absorption spectrometry.

采用扫描电镜观察钙铬榴石样品的显微结构并进行能谱分析，结果表明其内部含有颗粒很小的铬铁矿和石英包裹体，以及裂隙中充填的方解石和与钙铬榴石为类质同象连续关系的钙铝榴石，从而为该钙铬榴石的夕卡岩成因和产状提供了佐证。

Focusing on the problem that existing Space-Time Frequency-Shift Keying incurs a spectral efficiency loss, this paper proposes a novel ST-FSK based on Hadamard matrix modulation coined as HST-FSK.

摘要针对现有的空时频移键控频谱利用率低的缺陷，该文提出了一种基于Hadamard矩阵调制的空时频移键控方案。

HST-FSK uses the Hadamard matrix to expand a newly defined FSK waveform in both spatial and temporal dimensions according to the Kronecker product, and it achieves a higher spectral efficiency than ST-FSK owing to the more parameters are introduced into the new FSK waveform.

HST-FSK采用Hadamard矩阵对一个新的FSK波形向量在空、时二维上作Kronecker扩展，由于新的FSK波形向量中引入了更多的参数，因而HST-FSK能够获得比ST-FSK更高的频谱利用率。

The performance of handoff algorithms effect not only call quality, but also the spectral efficiency.

递交演算法的优劣，不只影响通话品质，也会影响频道的使用效率。

Sub-femtosecond pulse, molecular modulation, high harmonic generation, spectral synthesis

中文关键词：亚飞秒脉冲，分子调制受激拉曼散射，高次谐波，频谱合成

Their structures were identified by physico-chemical properties and spectral analysis. RESULTS Seven compounds were isolated as kaempferol,quercetin,astragalin,isoquercitrin,kaempferol-3-O-β-D-glucuronic acid methyl ester,4-hydroxybenzonic acid,hentriacontane.

结果分离得到7个已知化合物，分别为山柰酚、槲皮素、山柰酚-3-O-β-D-吡喃葡萄糖苷、槲皮素-3-O-β-D-吡喃葡萄糖苷、山柰酚-3-O-β-D-吡喃葡萄糖醛酸甲酯、对羟基苯甲酸、三十一烷。

Using real-valued decomposition technique, Unitary Cyclic root-MUSIC algorithm without spectral search was proposed for multipath environment of mobile communication, by reconstructing the data model of the cyclic covariance matrix with Hermitian property, which has a better performance in the presence of multipath propagation and substantially reduces the computational complexity.

通过构造了循环自相关矩阵的数据模型，使其具有厄尔米特特性，提出了一种基于实值分解技术的循环root-MUSIC算法，无需空间谱搜索，较好地解决了多径传播环境中信号高度相关问题，极大地降低了计算量。

To calculate numerically the radiation of a enclosure within a heteromorphosis cavity, attention was focused on: how to decide the visibility between two surfaces, how to improve the old method of configuration factor computation, how to approximately and efficiently decide the radiation resource of directional, spectral radiation in cavity.

讨论了解决异型封闭腔辐射几何学问题的几种方法：异型封闭腔内，表面间可见性的判断方法；优化异型封闭腔角系数计算的方法；确定异型封闭腔内定向辐射的壁面辐射源的方法。计算了两种结构喷管封闭腔内的角系数，并从角系数的互换性和完整性定理验证了方法的正确性和有效性，为异型封闭腔的辐射计算解决了几何问

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷