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噪声
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     I. Study on noise sources of microwave devices and noise modelsThe origins and characteristics of noise sources in microwave devices are investigated in this dissertation.
     一、微波器件中的噪声源与噪声模型研究本文研究了微波器件内部的噪声(主要是热噪声、散弹噪声和闪烁噪声)的来源与性质。
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     This thesis studies the characteristic of acquired signal (namely BPSK signal or QPSK signal) and non-acquired signal (namely white Gaussian noise), The AWGN channel of CDMA system is analyzed.
     论文从理论出发,研究了捕获信号,即被高斯白噪声污染的BPSK或QPSK信号及未捕获信号(高斯白噪声)的特征,分析了DS-CDMA系统的AWGN信道特性,详尽介绍了小波多分辨分解的相关知识,给出了应用于PN码捕获的小波检测的方法。
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     At last, a sine pulse and white noise is adopted to simulize theoretically, the real signal is used to classify and recognize the targets, and a satisfactory result is got.
     最后用仿真信号(正弦脉冲信号和白噪声)进行了理论仿真,达到了很好的分类(有信号和无信号两类)效果,并对实测信号进行了识别分类,达到了较为满意的效果。
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     Results:In group high noise exposure (130 db SPL, 8 kHz white noise), aFGFLI was seen to have decreased one day after exposure and did not recover untill one to two months.
     结果:130ddB噪声暴露后1d(130dBSPL,8kHz白噪声),aFGF样免疫反应明显下降,其下降水平持续1~2月。
短句来源
     On the other hand, in grouup low noise exposure (120 dB SPL), aFGFLI was also seen to be reduced one day after noise exposure, but, it recovered during one to two months. The changes in optical density of aFGFLI in the neurons of the cochlear nuclei were seen to be associated with corresponding changes in brain stem responses.
     120dB噪声暴露后1d(120dBSPL,8kHz白噪声),aFGF样免疫反应也下降,但在1~2月内恢复,蜗核神经元aFGF样免疫反应光密度变化似乎与听觉脑干反应相关。
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     A recommended acceptable noise level can be determined from the teacheras response to the noise under investigation.
     噪声调查;
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     WHITE NOISE
     白噪声
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Wavelets, generalized white noise and fractional integration: The synthesis of fractional Brownian motion
      
However, unlike the values of f(n)(t0), the values of the chromatic derivatives Kn[f](t0) can be obtained in a noise robust way from sufficiently dense samples of f(t).
      
This receiver simultaneously combats multipleaccess interference (MAI) and non-Gaussian impulsive noise.
      
This paper studies the characteristics of this type of image with complex shape target or noise and presents an improved Snake algorithm.
      
The simulation results indicate that the new Snake model greatly decreases the dependence on the Snake point's initial position and effectively overcomes noise influence.
      
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Accoustics becomes so important and complicated a problem in modern building practice, that it should be properly considered by every architect today. From the view of its practical aspects, the author makes a general review of several major problems in recent development of architectural acoustics. 1. Criteria of room acoustics: a)Reverberation time, b)Practical aspects of physical acoustics and discussion of the second physical quantity, c)Subjective observations; 2. Sound Systems; 3. Acoustical materials;...

Accoustics becomes so important and complicated a problem in modern building practice, that it should be properly considered by every architect today. From the view of its practical aspects, the author makes a general review of several major problems in recent development of architectural acoustics. 1. Criteria of room acoustics: a)Reverberation time, b)Practical aspects of physical acoustics and discussion of the second physical quantity, c)Subjective observations; 2. Sound Systems; 3. Acoustical materials; 4. Noise control and sound insulation.

建筑声学在现代建筑设计中的地位日趋重要,其复杂性也随之而增加;为今日每一建筑师所值得注意的问题。作者以实用的观点对近年来建筑声学发展中的几个主要问题加以综合的叙述。一、室内音质的评价标准:(1),混响时间,(2)物理声学的意义,和第二物理参量的研究,(3)主观评价;二、扩音系统;三、吸声材料;四、噪声控制和声音隔绝。

In order to rectify the existing acoustic defects of the lecture hall of Wen-Yuan Building in our university, a series of acoustic measurements were carried out, and analysis and a scheme of reconstruction was proposed therefrom, After completing the alteration according to the new designs in the summer of 1956, the hearing conditions of the hall were found to be greatlly improved. The author pointed out, however, that due to the lack of experience in this kind of work and to the insufficiency of acoustic instruments,...

In order to rectify the existing acoustic defects of the lecture hall of Wen-Yuan Building in our university, a series of acoustic measurements were carried out, and analysis and a scheme of reconstruction was proposed therefrom, After completing the alteration according to the new designs in the summer of 1956, the hearing conditions of the hall were found to be greatlly improved. The author pointed out, however, that due to the lack of experience in this kind of work and to the insufficiency of acoustic instruments, there are still certain defects, the remedy of which would require further research work. Ⅰ. Introduction Ⅱ. A general description and analysis of the lecture hall before alteration. Ⅲ. Analysis and improvement from the view of geometrical acoustics. Ⅳ. Reverberation time. Ⅴ. Sound intensity distribution after alteration. Ⅵ. Noise reduction. Ⅶ. Some unsolved defects and problems.

为改善本校文远楼大讲堂内的音质缺陷,我们曾进行了一系列的音质测定和分析工作,并作了改建设计。1956年暑改建完毕以后,基本上已能符合听讲的要求,听者一般都感到清晰和满意。由于声学仪器和实际经验的不足,工作中尚存在着一些缺点和问题,在本报告中亦一一提出,以待今后继续加以研究解决。Ⅰ.绪言。Ⅱ.现况介绍和分析。Ⅲ.从几何声学上加以分析和改进。Ⅳ.混响时间的改进。Ⅴ.改建后的声强分布。Ⅵ.降低噪声的措施。Ⅶ.工作中存在的问题和缺点。

The amplitude distribution of narrow hand semiconductor noise in junction type OC70, OC71 and point contact type 2N32A transistors were measured experimentally by the "maximum amplitude" method. It is found that the amplitude distribution of nai-row band semiconductor noise agrees with that of the normal law distribution.

本文中描述用振幅峰值的方法,测量面接触型晶体管OC70,OC71和点接触型晶体管2N32A内窄频带低频率噪声的振幅分布。测量结果证明窄频带晶体三极管噪声的振幅分布,和遵守正态律的振幅分布相符合。

 
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