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A new four-arm spiral antenna for microwave hyperthermia is presented in this paper. The finite element method was used to simulate the distributions of the electromagnetic fields and the specific absorption rate (SAR) of the four-arm spiral antenna in phantom muscle tissues. The simulation results show heating region of the four-arm spiral antenna can change as the frequency of input excitation....
In this paper, neural networks are used to decrease the Additional Secondary Phase Factors (ASF) error of Loran-C to improve the navigation accuracy. Through the training, the relationship between ASF corrections and seasons can be obtained, which is useful to compensate for the measured time-difference (TD) of Loran-C wave. The result proves that this method is effective and provides a new way for...
The finite element method was used to simulate the distributions of the electromagnetic fields and the specific absorption rate (SAR) of the microstrip spiral antenna in phantom muscle tissues. The factors that affect the antenna performance are compared. These factors include spiral wire's width, space of adjacent spiral circle and circle numbers. A new microwave hyperthermia antenna which is not...
A Hinfin filter based on GPS dynamic locating method is put forward in this paper. The proposed method is able to decrease the current acceleration model error. Some examples show that the method can perform better in GPS dynamic locating than EKF for less computation consumption and higher locating accuracy.
As the potential of Loran-C in land vehicle tracking, and in marine and aeronautical navigation explored, the importance of employing accurate values of additional secondary factors (ASFs) is increasingly being recognized. A computer method that used to generate ASFs for irregular terrain is developed. In order to determine the prediction accuracy of the method in irregular terrain, during the summer...
A new microwave hyperthermia antenna that isn't sensitive to neither its parameters nor fluctuation of the inputting frequency is presented in this paper. The finite element method was used to simulate the distributions of the electromagnetic fields and the specific absorption rate (SAR) of the Archimedes planar spiral antenna in phantom muscle tissues. The factors that affect the antenna performance...
In this paper, research on effect of turbulence to optical communication through the analysis of atmospheric turbulence, and display the optical plot in time. This is very important to optimize capability of optical communication.
Atmosphere turbulence is described in terms of a general formulation that does not assume any particular form foe the turbulence structure function. Expressions are obtained for the tow-point correlation function of the complex amplitude (i.e., the atmospheric MTF) and for the more general function, the tow-point two-wavelength correlation function of the complex amplitude. A cardinal set of measurement...
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