浅析歌唱中的呼吸法

在歌唱艺术中,呼吸是一个重要环节,它是歌唱的动力源泉。任何唱法都要有呼吸的支持,都要在动力上有上下贯通的功夫,唱歌训练都是这个规律。正确的呼吸方法有助于歌唱,能带动歌唱技巧的运用。     

离合器膜片断裂分析

阐述了某柴油机用离合器395膜片断裂失效是由于热处理不当造成的,并证实热处理时过热的后果在很大程度上可以通过多次正火的方法予以消除。     

论美声唱法中气息与咽腔的对立及统一状态

美声唱法具有科学、严谨的理念和训练方式。其中,气息的支持与咽腔扩张的科学状态都是我们应掌握的重点之一。通过刻苦的训练,应达到声音连贯、自然、柔和,气息饱满的艺术效果。     

歌唱的放松

美妙而松驰的歌声来自于放松。该文从练气和保持气息,以及歌唱通道的形成练习方面分析了歌唱中放松的重要性,提出了训练的方法。     

Test and Analysis of an Existing Tunnel Vibration Induced by Blasting Construction of Diaphragm Wall

According to the blasting construction of the diaphragm wall of Puxi approaching section of East Fuxing Road river-crossing tunnel, the monitoring project of the vibration of the existing tun-nel induced by the blasting construction is put forward, which includes the sensors’ location, moni-tor method and the vibration monitoring system. Based on the monitoring data of the explosion vibration, the vibration wave forms, velocities, acceleration responses, main frequencies and fields of measure points are analyzed under the conditions of three locations and different charge quanti-ties. According to the safety-judging standard of explosion vibration, the conclusion that the exist- ing tunnel is safe under the explosion vibration is then drawn. Furthermore, the spectrum character-istics of three explosion vibrations and the spectrum changing properties of explosion vi-bration wave transmitting in different directions are concluded, which can provide reference to similar projects.     

高压C-4204空气压缩机膜片泄漏原因分析与改造

C—4204空气压缩机是乙烯高压装置的重要设备,使用过程中由于膜片泄漏而频繁停车检修,影响了正常生产。对C—4204空气压缩机膜片泄漏的原因进行了分析,并提出具体的改造措施来延长膜片的使用寿命,经过长时间的实际使用,取得了显著的经济效益。     

Effects of structural parameters and rigidity of driving diaphragm on flow characteristics of micro valveless pump

The structure and operating principle of micro valveless pump were investigated theoretically and experimentally. The mathematical model of pressure and flow rate within the micro nozzle/diffuser was established to analyze the effects of nozzle/diffuser parameters on the output flow rate of the micro valveless pump. The experiments were carried out with different structural parameters, driving frequencies, vibration amplitudes and stiffness of the driving diaphragms. Effects of the structural parameters and driving conditions on the operation performance of the pump are discussed in detail. The work provides useful reference for structure optimization selection of the driving diaphragm of micro valveless pump. Project supported by National Natural Science Foundation of China (Nos. 50175098, 59835160)     

某地铁车站深基坑开挖地连墙水平位移分析

现场监测难以预测基坑和围护结构后期变形规律。采用MIDAS/GTS NX对某地铁车站深基坑开挖及支护全过程进行数值模拟,探寻深基坑开挖引起的地连墙水平位移变化规律,并对比现场监测数据验证数据模拟的可靠性。研究结果表明:随着基坑的开挖,地连墙不同深度下的水平位移变化呈现出内凸的规律,开挖完成时模拟最大水平位移值约为11.6 mm,现场监测最大值约为13.9 mm,最大水平位移位于开挖面附近;改变地连墙厚度及嵌固深度后发现,地连墙厚度及嵌固深度的增大可减小地连墙深层水平位移,但对地连墙顶部水平位移影响较小。研究成果可为深基坑开挖对周边环境影响的分析及类似工程施工方案的优化提供参考。