Nonstationary quiver spindle background sound analysis of airplane via Wigner-Ville and wavelet time-scale distribution

Enable background sound and music;

打开背景音响和音乐功能；

Measurement& Analysis of Typical Cockpit Background Sound in Anechoic Room

典型舱音背景声在消声室中测试分析研究

Influence of weak background sound on sound signal perception

弱背景声对声音信号感受的影响

Development and application of real-time analysis system on cockpit voice background sound in airplane

飞机舱音背景声特征实时分析系统开发及应用

The background sound of an environment in relation to which all foreground sounds are heard, such as the'silence'of an empty room, conversation in a restaurant, or the stillness of a forest.

环境的背景声音指的是所有可听到的突出声音，比如空房间里的“静默之声”，餐馆里的谈话，或者森林里的沉寂。

The disruption by background sound is imposed at both encoding and rehearsal periods.

背景声音干扰处于编码阶段和复述阶段。

Preventive management of veinous backflow obstruction of infrahyoid myocutaneous flap

舌骨下肌皮瓣静脉回流障碍的预防性处理

Junction Treatment in Computation of Short Backfire Antenna by Moment Method

短背射天线矩量法计算中的结头处理

The backfire antenna is a kind of compact structure, high gain and lower sidelobe antenna, but its bandwidth is limited.

背射式天线具有增益高、副瓣低和结构紧凑的特点，但其频带较窄。

The final result shows that the stress peak value of the tunnel is reduced by 95% with the foamed concrete backfill layers, and dynamic parameter such as acceleration and displacement is attenuated to a certain extent.

计算结果表明，增加泡沫混凝土耗能层后，坑道结构的应力峰值衰减了95%以上，加速度和位移等运动参数也有不同程度的降低。

The dynamic response of tunnels can largely be reduced by the foamed concrete backfill layers, which can be used to construct a sort of ideal energy absorption support structure.

泡沫混凝土耗能层能够明显减小结构的动力响应，可以用来构筑较理想的结构消波吸能型式。

Comparing with conventional concrete backfill technology, the new one of concrete backfill using for embedded pre Pressure steel Pipes has some advantages such as shorter construction period, lower cost.

埋藏式预压力钢管混凝土回填新技术与常规回填相比，简化了施工措施，缩短了工期，具有良好的技术经济效益。

A Kind of New Technology of Concrete Backfill Using for Embedded Pre-pressure Steel Pipe in Xiangshui Hydropower Station

响水电站埋藏式预压力钢管混凝土回填新技术

An Experimental Study on Strength Properities of Concrete Backfill

混凝土充填体强度特性试验研究

Key construction technique mainly includes maintaining cavern stability, protecting surrounding rock integrity and guaranteeing concrete backfill quality.

关键施工技术主要体现于维护施工期洞室稳定，保护围岩完整性和保证结构混凝土回填质量三方面。

The Backfill Grouting for the Underground Culvert at West Ring Road of the South-North Water Transfer Project

南水北调西四环暗涵工程回填灌浆施工

Forced Defrosting and Backfill Grouting Composite Application at φ 14.87 Shield Launching Section Frozen Area

φ14.87盾构出洞段冻结区强制解冻及注浆充填的复合应用

Construction of Backfill Grouting and Consolidation Grouting In Tunnel Excavated by TBM

TBM掘进隧洞回填固结灌浆施工的探讨

Pea Gravel Backfill Grouting and Its Quality Control in the Construction of TBM

浅谈TBM施工中豆砾石回填灌浆及其质量控制

Application of Backfill Grouting in Road Construction

回填注浆在道路施工中的应用