声学

The tidal current, suspended sediment concentration and bed load grain size at Humen estuary of the Pearl River in spring tide during flood season in 2004 were observed by using ADP and traditional survey instruments.

2004年洪季大、中潮期间，用声学多普勒流速剖面仪和传统观测方法对珠江口虎门水域水流、悬沙浓度及底质粒度进行了现场多点同步观测。

The effects of the noise source and its direction of Chinese speech average frequency spectrum on the intelligibility of Chinese speech were discussed in different room acoustical characteristics and signal-to-noise ratio conditions.

在不同室内声学特性、不同信噪比条件下探讨汉语语言平均频谱干扰噪声及其方向对汉语语言清晰度的影响。

Firstly,the inputs of the lyrics are converted into speech with the text to speech synthesis system.Then,the melody parameters of the song are extracted from the MIDI file.At last,the melody control model is adopted to achieve the lyrics to song conversion by modifying the acoustic parameters of speech signal.

首先利用一个文语转换系统将输入的歌词转换为语音，同时从歌曲的MIDI文件中提取歌曲的旋律参数，最后通过旋律控制模型对语音信号的声学特征进行修改，实现由歌词到歌曲的转换。

Acoustic Performance - porous glass fiber is one of the best sound-absorbing materials.

声学性能——多孔性玻纤是最佳的吸音材料之一。

The result? Smiles all round from the owners - well, they're still not too happy with the looming presence of the elevated speakers, but we'll sort that some time - and at last some imaging and sense of reality. Enough to work on when they try biwire cables in place of the single-wire stuff they're using.

后来我们用一些东西将音箱向上垫高了20cm，这样使比较低的高音单元发出的声音被沙发很好的吸收，然后我们用毛巾掩住了壁炉口直到后来我们用声学泡沫进行了替换达到了较好效果，并且我们也在音箱上安装了防止震动的脚钉。

Inunderwater acoustic research specially in shallow-sea acoustic,the scatteringon different rough surface is important factor affecting underwater environmentand background.

粗糙表面声散射在很多领域均有重要的应用，水声研究中尤其是浅海声学的研究，各种粗糙界面的散射更是影响水下环境和背景的重要因素。

Fluidization and Sounding Pressure Characters Experimental Research on Pulsating Fluidized Bed After verifying experimentally the Rijke type self-exciting pulsating fluidized bed combustion, under different operating conditions (different empty cross-section wind speed and inaction bed height), experimental research the oscillation characters of sounding pressure in the pulsating fluidized bed. The results indicate that the sound characters in the Rijke type self-exciting pulsating fluidized bed combustor are the same with it in the Rijke type combustor, the pressure in the combustor oscillate up and down in the sinusoidal manner and the pressure is the superposition of the multiple harmonic waves.

脉动流化床流化与声学压力特性实验研究在实验验证了Rijke型自激脉动流化燃烧概念后，在不同运行条件(空截面风速、静止床层高度)下，实验研究了Rijke型自激式脉动流化床的声压振动特性，研究结果表明：脉动流化床内建立起的声波特性和Rijke型脉动燃烧器内的一样，各点压力呈正弦规律上下振动，且压力是基波幅值最大的多次谐波的叠加。

Aiming at realizing processing long and thin hole on the vitro ceram, the ultrasonic machining technique was used. The design of ultrasonic machining acoustics system was completed. The analysis of the tool distorted and stress under the different pressure force was taken by finite element analysis.

为实现在微晶玻璃上的细深孔加工，采用了超声加工方法，完成了超声加工声学系统的设计，并用有限元分析方法对工具在不同压力下的变形和应力进行了分析。

In this thesis, a mathematical model of multi-path channel is established by using the theory of ray acoustic to simplify the physical of underwater sound channel.

本文利用射线声学的方法，简化了水下声信道的物理问题，构造出一种多途信道的数学模型。

Birdsong is one of the most active domains in bioacoustics.

鸟声研究则是生物声学研究中最为活跃的领域之一。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。