声学

At last, an investigation on the reconstructing mechanism, methods and relational algorithms of 3-D temperature field with acoustic pyrometry is made. Furthermore, an elementary discussion on key points in the reconstruction is given.

最后，对三维温度场声学测量方法的机理、方法和有关算法进行了研究，对声学温度场测量中的几个关键技术进行了初步的探讨。

The function of measuring the velocity of platform relative to the bottom is used in navigation of multiple platform.

用于测量海流速度的称为声学多普勒海流剖面仪，用于测量平台相对于海底的速度的称为声学多普勒计程仪。

Mark Rustad is President of NetWell Noise Control, NetWell is a leading supplier of ceiling tiles, acoustic products, sound proofing treatments, and online acoustical consulting services.

马克鲁斯塔德是总统NetWell噪声控制， NetWell是一家领先的供应商，天花板，声学产品，隔音处理，在线声学咨询服务。

Therefore, this new phenomenon has been investigated carefully and the attenuation of sound wave was analysed.

因此，对海尔姆霍兹共振器的声学整流效应进行了较深入的研究，并且分析了产生这种新的声学整流效应现象的声波衰减机制。

The results show the high accuracy quality of spectral element method and the stability of Newmark time integral method. Then some computational parameter is changed in example one such as the subdivision style of computational domain, time step length and such on. Some important conclusions and strategies for spectral element method with Newmark integral method for computational aeroacoustics can be given. The feasibility of spectral element method for computational aeroacoustics is verified.

计算结果表明谱元方法的高精度及Newmark时间积分方法的稳定性，并改变算例的计算参数，例如计算区域剖分方式、时间推进步长等进行了计算，得出了一些重要结论，为使用谱元方法结合Newmark积分求解气动声学问题积累了重要的经验，最终证明了谱元方法求解计算气动声学问题的可行性。

In order to test spectral element method and Newmark time integral, the codes of program and the feasibility of spectral element method for aeroacoustics, One question which has analytical solution and two typical questions of computational aerocaustics are simulated numerically by the program.

为了验证谱元方程和Newmark时间积分方法的正确性、自己所编程序代码的有效性以及谱元方法求解气动声学问题的可行性，本文使用程序分别求解了具有解析解的波动方程和计算气动声学问题中的两个典型问题。

In this paper,the principle and primary results of measure ultrasonic sound velocity and attenuation coefficient by ultrasonic syntonic method are introduced.

1 前言各种介质的声学特性主要由声速、声衰减、声阻抗等参数来描述，这些量统称为介质的声学特征量。

Emphasis is laid on the research progress in the field of new generation speech synthesis technology contributed by USTC iFlytek speech laboratory, which includes integration articulatory and acoustic features for improving the flexibility of acoustic parameter generation; a minimum generation error criterion proposed to replace maximum likelihood for improving synthesized speech quality; use of unit selection and waveform concatenation to replace parametric synthesizer, thus effectively avoiding the limitation of speech quality in HMM based parametric synthesis.

重点介绍中国科学技术大学讯飞语音实验室在发展新一代语音合成技术中的贡献，包括：融合发音器官参数与声学参数，提高声学参数生成的灵活性；以最小生成误差准则取代最大似然准则，提高合成语音的音质；使用单元挑选与波形拼接方法取代参数合成器重构，从根本上改善HMM参数语音合成器在合成语音音质上的不足。

Methods: Five PD patients with bilateral STN-DBS, aged from 43 to 75 were included as subjects. Speech measures included diadochokinetic syllable rate test, articulation-acoustic analysis, verbal fluency rate, and voice evaluation and acoustic analysis.

受试者为五名44至75岁巴金森氏症患者，接受双侧视丘下核深部脑刺激手术治疗，言语机转测量包括「口功能检测」、「母音构音声学评估」、「口语流畅度」、「嗓音声学分析评估」。

The systems of the voice acoustic analyzing and the glottal image analyzing, which are realized by using LabWindows/CVI virtual instrument programming language, are discussed in detail.

嗓音声学分析系统可进行声音信号的采集、存储和回放，并可对采集的声音信号进行三维声图分析和声学参数的提取分析。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。