声学

Drift electron mobility, the Hall factor and Hall mobility in GaN are calculated according to Mattiessen's rule as a function of temperature for carrier concentrations with the compensation ration as a parameter on the basis of taking into account the individual average scattering momentum relaxation time of four scattering mechanisms, namely, ionized impurity scattering, polar mode optical scattering, acoustic piezoelectric scattering and acoustic phonon deformation potential scattering which have an effect on electron mobility of GaN.

考虑了对纤锌矿型氮化镓低场电子输运影响最为显著的4种散射机制－电离杂质散射，极化光学波散射，声学波压电散射和声学声子形变势散射的单个平均动量驰豫时间，采用Mattiessen's rule计算了不同补偿率以及不同载流子浓度条件下，氮化镓电子漂移迁移率，霍耳因子以及霍耳迁移率随温度的变化。

According to the theory of wave acoustics and ray acoustics,train is regarded as a moving limited line sound source and the mathematics model of sound field distribution is set up around the elevated railway.

根据波动声学和几何声学原理，将列车看作一运动着的有限长线声源，建立了有声屏障时城市高架轨道交通沿线声场分布计算模型。

Methods: Twenty-five cases of urethral diseases underwent urethral retrograde contrast sonography and other ways (X-radial urethral contrast, urethroscope and emiction way of urethral contrast).

用逆行尿道声学造影检查25例尿道疾病患者。同时作X线尿道造影、尿道镜、排尿法尿道声学造影进行对比。

Review articles only; ear; acoustic; hearing loss; deafness; ototoxicity; otorhinolaryngeal; vestibulocochlear; cochlea; sound; bioacoustics; organ of Corti; semicircular canals; cochlear implants; binaural; monaural; tympanic; malleus; incus; stapes; ear drum; geniculate; inner ear hair cells; outer hair cells; round window; oval window

唯一综述；听觉；声学的；听力损失聋的；耳毒性；otorhinolaryngeal；前庭蜗；耳蜗；声音；生物声学的；柯替氏器；半规管；耳蜗植入管；两耳的；单耳的；鼓膜的；锤骨；砧骨；镫骨；耳鼓；膝状的；内耳毛细胞；外毛细胞；圆窗；卵圆窗

Ear; acoustic; hearing loss; deafness; ototoxicity; otorhinolaryngeal; vestibulocochlear; cochlea; sound; bioacoustics; organ of Corti; semicircular canals; cochlear implants; binaural; monaural; tympanic; malleus; incus; stapes; ear drum; geniculate; inner ear hair cells; outer hair cells; round window; oval window

听觉；声学的；听力损失；聋的；耳毒性；otorhinolaryngeal；前庭蜗；耳蜗；声音；生物声学的；柯替氏器；半规管；耳蜗植入管；两耳的；单耳的；鼓膜的；锤骨；砧骨；stapes；耳鼓；膝状的；内耳毛细胞；外毛细胞；圆窗；卵圆窗

Based on some correlative the theory analysis and conclusion of experiment about impedance muffler, some issues about the foundation of model of leak pipeline are tried instructively and analysis reasonably by the acoustical analysis and the characteristic of acoustical spread in the leak pipeline is studied. The leak detection is a little more wonderful technology which can find the leak and then locate it accurately in virtue of correlation leak detection.

本文综合了有关文献的理论分析和试验结果，从声学的角度对供水管道漏损的声学模型的建立进行了有益的尝试和合理的分析，并对漏损管道内的流体声传播特性进行了研究。

Communication acoustics, the result of interpenetration between information technology and acoustics, is now getting a big extension in its researches and applications, due to the development of DSP technology.

作为声学与信息技术相互渗透的产物－通信声学，近十几年来随着数字信号处理技术的发展，其研究和应用领域得到了很大的扩展。

Lande technology since 2000 acoustic testing to explore the mainland market space, at home several times to assume the construction of large-scale acoustic engineering laboratory mission.

朗德科技从2000年开始开拓国内声学测试用房的市场，在国内多次承担大型声学实验室建设的工程任务。

The TIB triphone model tying structure adaptation strategy uses the baseline acoustic model's triphone model tying result as the transcendental model clustering center, with the adaptation data alignment by the baseline acoustic model, re-estimate the TIB triphone model clustering center and model tying structure recursively under maximum likelihood principle.

以基本声学模型训练过程中的三音子模型聚类结果作为先验知识的聚类中心，依据基本声学模型对自适应语音库的分割，按照最大似然准则迭代地重估新的聚类中心和模型聚类结构。

A speaker apparatus includes a speaker frame, an acoustic vibrating plate movably supported on the speaker frame, and a magnetic driver formed in the speaker frame for vibrating the acoustic vibrating plate.

一种扬声器装置，包括：扬声器架；声学振动板，可运动地支撑在扬声器架上；和磁驱动器，在扬声器架中形成，用于使声学振动板振动。

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。