Study on center frequency of tomato water stress based on virtual instrument

In this paper,developed are a method and correspondent software for calculating formation permeability from the center frequency shift and travel time delay in direct Stoneley wave.

This paper derives the universal formulas for three characteristic parameters, center frequency, gain of center frequency and quality factor of bandpass filter, calculates the theoretical values of the three characteristic parameters; analyzes the effects of center frequency migration of bandpass filter on logs.

The main method is combined the square wave circuit with the switch capacitor filter MAX268BCNG to realize the automatic tracking filtering at the central frequency,which is form1Hz to 15Hz.

The central energy variation of electron bunch is obtained by measuring the central frequency, which is in agreement with the result from measuring closed orbit and horizontal dispersion function.

The key technique of this new filter is how to achieve the extreme narrow band-pass width and a slight deviation of central frequency.

Fixed Frequency Assignment Based on Immune Genetic Algorithm in Cellular Mobile Communication;

Solving frequency assignment problem using an adaptive multiple-colony ant algorithm;

Fixed frequency assignment based on genetic annealing algorithm which annealing algorithm was introduced into genetic algorithm in cellular mobile telephone communication was proposed,it improved performance of genetic algorithm and increased the convergence velocity by annealing lighted choice pressure of genetic algorithm and performance of mountain climbing.