查询词典 spectrum

In order to decrease the measuring error of signal processing in laser Doppler velocimeter, frequency spectrum correction methods for lacer Doppler signal were proposed. Basic principles of energy centrobaric correction, ratio correction and phase difference correction were expounded. The three methods processing ideal sinusoidal signals was simulated with different signal frequencies, and so was the ratio method processing sinusoidal signals with different noises and signal to noise ratios.

在激光多普勒测速仪中，为了减小由信号处理算法带来的测量误差，提出运用频谱校正算法对多普勒信号的频谱进行校正，详细阐述了能量重心法、比值法和相位差法3种离散频谱校正算法的基本原理，运用这3种算法对理想正弦信号进行仿真，并运用比值法对信号施加不同频率和信噪比的噪音下的正弦信号和实测的多普勒信号进行仿真及实验研究。

Inthis paper, we collect 119 γ-ray-loud Blazar 97 flat spectrum radioquasars (FSRQs and 22 BL Lacertae objects,and investigaterespectively the correlation between the γ-ray emission (maximum,minimum, and average data) at 1GeV and the radio emission at 8.4GHz bydiscrete correlation function method.

收集了119颗有γ射线噪的Blazar天体样品(97个平谱射电类星体和22个BL Lac天体)，用离散相关函数方法分析了1GeVγ射线辐射流量(最大值、最小值和平均值)与8.4GHz射电辐射流量之间的相关性。

The excited and emission spectra of anthrone derivative, lactoflavin and chlorophyll a in different solvents are taken and the fluorescence yields has been estimated. The results show that the emission spectrum depends on the structure of molecule, and shifts to red with increasing of number of π electrons in the molecule.It is...

本文通过考察三种具有不同π电子数的有机共轭分子在不同溶液中的光谱特性，观察其激发光谱和发射光谱的变化情况，比较同一分子在不同溶液中的荧光量子产率，并通过对各类有机共轭分子溶液的光谱分析比较，以获得有机共轭分子的发光受溶剂影响以及同一溶液中不同有机共轭分子间发生非辐射共振能量转移的信息。

In this algorithm, multiple lag parameters and the spectrum correlation property are used to exploit the cyclic statistical information and time domain characteristics of signals sufficiently and ef-fectively. Moreover, this method remedies the lack of space domain information, and it is an extension from space domain to space-time domain. Therefore the ability to select the desired signals and supress the noise and interfering signals is improved.

该算法在利用信号的谱相关特性的同时使用了多个时延，将波束形成技术从空域扩展到了时空域，弥补了空域信息的不足，充分利用了信号的循环统计信息和信号的时域特征，提高了信号的选择能力和对干扰、噪声的抑制能力。

The Lagrange multiplier was firstly used for solving spectrum optimization problem with the interference factor.

首先，讨论了采用拉格朗日乘子求解带串扰项的频谱优化方法。

It is one of the commonest phenomenon which we all discover that the couples of cross-cultural marriage face langrage barriers, stereotypes, culture shock; that if remembering makes them fight less, they shall frequently encounter all sides of the emotional spectrum: elation, excitement, passion and frustration, fear and stress; that the difficulties of cross-cultural marriage may appear immense, but they are not unfeasible, so that there are heavy odds in favor of most cross-cultural marriages between "true love", these couples work hard to overcome their differences because they know the meaning of happiness:"God gave me the best husband/wife ever, I am incredibly blessed to have met him/her."

目前我们发现一个最为普通的现象是：跨文化婚姻夫妇面对语言障碍，世俗偏见和文化冲突；即使回忆往事是减少争；吵的灵丹妙药，但他们时常经历起伏不定的情感变化：欢欣，激动，激情或是沮丧，恐惧和压力；跨文化婚姻的困难看上去很艰难，但并非不可逾越，大多数跨国婚姻最可能基于真爱，所以夫妇双方都很努力克服双方的差异，因为他们更加明白幸福的真谛，"上帝赐予我最好的丈夫/妻子，能在茫茫人海中遇到他/她，我感激涕零。"

According to the quality problems of continuous casting slab existed in Benxi Iron and Steel Group Co., the content, shape and chemical component of non-metal inclusions and the gas content in the slab of Q235 Grade were analyzed and measured by large sample electrolysis, metallographic analysis and SEM spectrum et al.

结合本溪钢铁集团公司连铸板坯质量存在的问题，应用大样电解、金相分析、扫描电镜能谱分析等检测手段，对选定典型钢种（Q235）铸坯中夹杂物的质量分数、形态及组成，铸坯中气体等进行了分析和综合评价，并提出了改善铸坯质量的具体措施，为进一步提高本钢连铸坯质量提供了理论指导依据。

The influence of the self-mixing effect on both output power and spectrum of the diode laser is presented.

给出了半导体激光器由于自混合效应引起的频谱变化，分析了反馈光强度对半导体激光器输出特性的影响。

The Si/Al ratio of NaY molecular sieve was determined by an empirical formula of lattice constant obtained by extension function method of X-ray diffraction and framework Si/Al ratio of NaY molecular sieve determined by solid nuclear magnetic resonant spectrum method.

前言晶胞参数是决定晶体结构的重要参数之一，Na Y超稳分子筛属立方晶系，由于 Na Y超稳分子筛骨架硅铝比受许多条件的影响，如投料比、晶化温度、晶化压力和晶化时间等。通过研究发现分子筛骨架的硅铝比与其晶胞参数相关，而分子筛的硅铝比可作为合成分子筛产品质量的控制指标 [1] 。

In this paper, the dynamic properties of folded plate type latticed shell are studied by modal analysis, response spectrum and time history method with the effects of thinness and slope on dynamic internal forces also discussed.

本文采用振型分解反应谱法和时程分析法对折板式网壳结构的动内力作了研究，计算分析了结构厚度、坡度等参数对动内力的影响。

Nowadays, most of research are to build a transmutative Petri Nets through adding controlling place sets, controlling arc sets and controlling policy to the basic Petri Nets, while the Controlled Petri Nets could be used to argue many controlling theory problems conveniently and to induce many logically and physically supervisory and solve the Event Feedback Controlling Problems and State Feedback Controlling Problem in DEDS supervisory theory.

目前大多数的研究表现为在变形后的受控Petri网基础上，利用各种方法求得各种逻辑型、结构型控制器，解决DEDS监控理论中的事件反馈控制问题与状态反馈控制问题。

On one hand, there are discussions with the works council and union about extension of short time working up to the end of September.

一方面，有讨论，工程理事会和联盟关于延长工作时间短至9月底。