vacuum-tube noise

By making use of thermo-field dynamics ( TFD), the quantum fluctuations of current of the mesoscopic lossless transmission line in the vacuum state, the coherent states and the squeezed states with thermal noise have been studied.

利用热场动力学的方法研究了介观无损耗传输线中电流在具有热噪声的真空态、相干态和压缩态下的量子涨落。

The experimental research on aerodynamical noise of vacuum couch roll

真空伏辊空气动力性噪声实验研究

The original import vacuum pumps, vacuum pumping strong, no noise.

原装进口真空泵, 抽真空强劲, 无噪音.

The key point of reducing noise paper machine is to reduce aerodynamic noise of vacuum couch.

降低真空伏辊空气动力性噪声是降低抄纸机噪声的关键.

Environment friendly, healthy products, completely avoid the secondary pollution and great noise of conventional vacuum cleaners.

环保 、 健康型产品, 完全避免了拖走式吸尘器造成的有害的二次污染和很大的噪声.