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This paper presents a dynamic magnetic field prediction for perpendicular writer heads in magnetic recording systems. The dynamic model considered the effect of time dependence and velocity of soft underlayer when compared with a static model. The effects of the spin speed of the disk platters, and rise time of the recording signals are investigated. The results showed that the write field performance...
In this paper, the circuit model of three-phase transformer with three-legs under DC inrushing is set up. Considering the magnetic coupling of three legs, the nonlinear single-value curve of one leg of transformer is deduced. Combining the circuit equation and nonlinear B ~ H curve of one leg of transformer, we gain the wave and harmonics distribution of exciting current. Because of magnetic coupling...
This paper presents a brief theoretical discussion on the issue of the wire-grid representation of surfaces using the numerical electromagnetics code (NEC). Different approaches for the determination of the parameters (in particular, the segment radii) of a wire-grid representation of a metallic surface are presented. These approaches are tested vs experimental data on electric field distribution...
In order to gain insights for the measurement data from a newly installed proximal on-line lightning monitoring system (OLMS), a dipole model of the lightning channel was used to generate the induced EM field, which was then allowed to interact with major structures at a space launch site via a field scattering/coupling analysis. The analysis based on remote sensing data makes it possible to compare...
Studies that compared the performances of the early streamer emission (ESE) air terminals and the charge transfer system (CTS) with that of the Franklin rod (FR) system have been conducted in Malaysia since 2003. The results from these studies suggest that the ESE and CTS systems were more effective than the FR system. However, a review of the available information shows that the results were based...
In this paper, an iterative solution of the time difference of arrival equations for the problem of locating cloud-to-ground (CG) lightning return strokes is presented. It is shown that the problem involves a set of nonlinear hyperbolic equations. To solve the problem, the governing equations are first linearized by expanding them via their first order Taylor series expansion around an initial value...
Co-existence of GSM1800 and GSM1900 that share the same frequency band is becoming one of significant problems and the most challenging issues. The most critical co-existence situations occur when the downlink of any system is close to the uplink of the concerned GSM system. In that case one base transceiver station (BTS) is constantly disturbing a GSM BTS probably with high gain antennas on both...
This paper presents a method to analyze the reflectometry responses of a branched network of non-ideal wires. A modified bounce diagram that uses a transition matrix to keep track of signal flow is used. This approach is further improved by including the complex propagation constant to include the frequency dependent filtering effect (phase delay and attenuation) of the non-ideal transmission lines
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