The paper studies electron nonlinear steady motion equation in free electron lasers with axial magnetic field by the perturbed appro?

We analyse environmental problems in city construction and put forward appro ˉ priate prevention and control measures.

本文分析了城市建设施工所引起的一些环境污染问题，并提出相应的防治措施。

Practice and Understandings to the Regulation Engineering of Approach Channel at the Connection Section for the Yangtze River Three-Gorges Project

长江三峡工程引航道连接段整治工程的实践与认识

The test results show that the optimal layout can effectively improve the flow condition for navigation at the entrance area of approach channel.

结果表明，泄洪闸分侧布置可有效地改善引航道口门区通航水流条件。

The flow conditions in the approach channel are one of the prerequisites to ensure the ships navigating safely.

航道水流条件是保证船舶航行安全的主要问题之一。

A study on Siltation in different alignments of the approach channel to Lianyun harbour

连云港不同走向外航道的回淤研究

Underwater blasting execution technique of approach channel in front of weir of the inlet of diversion tunnel

导流隧洞进口堰前引渠水下爆破施工技术

Database software of shiplock ′ s filling and emptying system and real-time simulation of unsteady flow in approach channel

船闸输水系统数据库软件与引航道非恒定流实时模拟

Moreover, experimental study is carried out on optimization of training works at the entrance and connection areas of approach channel.

并对引航道口门区及连接段导流工程的优化进行试验研究。

Calculation and prediction of siltation in the approach channel to Lianyun harbour

连云港外航道的回淤计算及预报

Sediment Characteristics and Siltation Analyses of Shanghai Yangshan Harbor and Its Approach Channel Waters

上海洋山港区和进港航道水域泥沙特性及回淤分析研究

Influence of To and Fro Current upon Navigation in Lock Upper Approach Channel of TGP

三峡工程上游引航道往复流对通航的影响

Test on Ship Squat Sailing on Approach Channel of Huanghua Harbor

黄骅港进港航道航行船舶下沉运动量试验

The channel safety evaluation of Yangon river approach channel is analyzed by using fuzzy synthetic evaluation.

应用模糊综合评判方法，分析仰光河航道的航道安全。

Arrangement of Ship Lock Approach Channel in Mountainous Rivers

山区河流船闸引航道布置型式

Monitoring on Outer Deformation of Separation Levee at Lower Approach Channel of TGP

三峡工程下游引航道施工期隔流堤外部变形监测

The unsteady character of the model was used with an iterative technique to approach channel steady flow.

模型采用显式非恒定流渐近迭代法计算河流恒定流场。

Test on Wave Amplitude and Slope During Lock Filling and Emptying in Approach Channel

船闸灌泄水引航道内波幅与比降研究

Research on approach channel dimension of Tianjin central fishing port and sediment siltation

天津中心渔港进港航道尺度论证与航道泥沙回淤研究

Experimental Study on Unsteady Flow of Downstream Approach Channel from Locks of Three Gorges Project

三峡船闸下游引航道不稳定流试验研究

Influence of Daily Regulation of the Three Gorges Power Station on Operating Conditions of the Approach Channel

三峡电站日调节对船闸引航道运转条件的影响