轰声和轰声测量的频率限

轰声陡峭的前沿和后沿，要求测量设备的频率响应范围越宽越好，但实际上，测量设备的频率响应范围总是有限的。本文从讨论Ｎ波的时域和频域特性出发，由设定的测量设备的频率范围。将Ｎ波从频域变回到时域，再由时域波形的畸变程度，提出声学测量设备应有的频率响应范围，将此用于轰声的测量，对一般精度的测量，设备的频响范围为０．１５－１３００Ｈｚ时，能量测量的理论误差不大于１％，峰值超压测量的理论误差不大于３％。     

Cyclic behavior in dynamic investment decisions for deregulated energy markets

In the first years after the deregulation of the electricity industry, investment into new generation capacity has not taken place on a large scale in any central european country. Recent increases in prices indicate that investment could be very profitable. However, the fear is that the need for new capacity can be overestimated and that could lead to a decrease in prices and profits and consequently to a reduction/stop of new investments. The aim of this paper is to model and analyze factors that influence the stability of electricity prices. The electricity market is modeled using a Cournot game and the stability of electricity prices is analyzed by simulations. The research was supported by the grant 1/3001/06 of the Grant Agency of Slovak Republic (VEGA) and grant VVGS 36/2006.