查询词典 acoustics

In this paper, not only the musical acoustics, twelve-tone equal temperament but also the overtone, the intervals are present. Some effects on the temperament and intonation are analyzed.

详细地介绍了现代钢琴的律制、音乐声学、十二平均律、谐音以及音程中所产生的拍音原理，分析了影响钢琴音律和音准的各种现实因素。

From an acoustics point of view, the 0.2 to 0.5 mm cartilage plate depending on different areas of perforation seems to be most preferable with regard to tympanic membrane vibration.

由声学的观点而言，0.2至0.5公厘的软骨板於不同面积大小的破洞重建中，提供了较佳的耳膜振动。

Ultrasonics, a rapidly developing branch of acoustics, has many applications.

超声是近代声学中发展较快而应用较广的一个分支。

The propagation of stress waves in solids can be considered as a part of the field of acoustics or ultrasonics depending on the conditions.

应力波在固体中的传播，根据其条件可视为声场或超声场的一部分。

Professor Jorge Arenas of the Institute of Acoustics in Valdivia, Chile, acknowledged that the problem was serious but said,"NASA has developed one of the safest and risk-controlled space programs in engineering history."

智利的valdivia大学声学系 Jorge Arenas 教授知道这是个严重的问题，但是说："美国国家宇航局已经开发出一个被认为是工程历史上其中一个最安全的空间风险监测系统"

Professor Jorge Arenas of the Instituteof Acoustics in Valdivia, Chile,acknowledged that the problem was serious but said,"NASA has developedone of the safest and risk-controlled space programs in engineeringhistory."

智利瓦尔迪维亚声学院的教授乔治—阿瑞纳斯承认此问题十分严重，但是他说： NASA 已经创造出了工程学历史上最安全、风险控制得最好的太空计划之一。

The phylogeny and applied prospect of MES are summarized in the paper. The principle of this system is analyzed from the point of view of acoustics. The surveying and filtering technology of auxiliary parameters, sounding data and the theory of image form, backscatter strength data processing, are researched deeply in the paper. The optimal model of velocity of sound is given. For sound ray tracing, some methods of correction of sound ray curve are developed. At the same time, an ideal model of sound ray tracing is proved and given. The GPS technology is applied for the determination of tide, attitude of vessel. Moreover, some methods are given. As an important topic, the systematic error is discussed in the paper. Some filtering methods are researched in this paper. Based on the current methods of image processing, the procedure and methods are tested and given that adapt to sonar image processing.

本文研究的工作是在总结多波束声纳测深系统的发展历史、应用前景的基础上，从声学角度分析了多波束系统的工作原理；对多波束辅助参数的测定和滤波方法、测深数据的滤波方法、多波束声纳图像的形成机理、图像处理以及最终应用等作了比较深入的研究；得出了适合于多波束精密深度计算的最优声速模型和声线改正模型；提出了 GPS 载波相位定位技术用于多波束辅助参数测量的思想、算法，改善了多波束系统的作业模式；系统地分析了深度数据的误差来源和类型，首次将系统误差作为影响测深精度的主要因素给以研究，并给出了削弱系统误差的方法，提高了深度数据的质量；对多波束声纳图像的形成、处理方法进行了细致的研究，给出了适合多波束图像处理的算法和流程，并从理论和实践上对声纳图像的应用进行了比较全面的研究。

It is the important tache that transfers the vocality works into acoustics stream form and directly connect with the audiences.

它是声乐作品转化为音响流动形态，并直接与欣赏者发生审美交流的重要环节。

Acoustics - Reference zero for the calibration of audiometric equipment - Part 1 : reference equivalent threshold sound pressure levels for pure tones and supra-aural earphones .

声学。测听设备校准用参照区。第1部分：纯音和耳挂式耳机的参考等效阈声压级

The acoustics system is based on AQS901 sonar system, compatible with BARRA, SSQ-41 and SSQ-53, TANDEM, and Ultra active and passive sonobuoys.

声纳系统核心为AQS901声学系统，可兼容巴拉，SSQ-41，SSQ-53，坦登和奥察等主动和被动声纳浮标。

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。