Wires Of Different Lengths Research Articles

Reconsideration of the Transient Line Source Technique. 4th Report. Analytical Discussion on the Influence of the Edge Effect.

In measuring thermal conductivities of liquids by a transient line source technique, one of the main error factors involved is the owing to the heat flow from the hot wire to the electrode through the wire edge. In this report, analytical investigation is performed concerning the edge effect on the measured thermal conductivity considering two basic cases; in the first case, a hot wire is directly connected to the electrode; and in the second case, a ringwise projection having a square cross section is attached at the connection of the hot wire to the electrode. Then the effectiveness, using a Wheatstone bridge circuit where two hot wires of different lengths are set to cancel and minimize the edge effects, is discussed analytically. As a result, the edge effect cannot be negligible even when using the bridge circuit, depending on the size of projection.

A dependent fatigue lifetime model

An ARMA(p,q) Box-Jenkins fatigue model which allows to take into account the dependence between the strengths of neighbouring pieces of material for constant stress range is presented and the asymptotic convergence, for large lengths of materials, to a Gumbel distribution is shown. When the stress range varies, a regression model, compatible with Gumbel result, is derived. This model is based on a functional equation which is solved and a three parameter family is obtained as the only solution. Finally, an example of application with real fatigue data is included. Monte Carlo simulations give the distribution functions of the fatigue strength of wires of different lengths and allow their design. In this way, the influence of dependence is analyzed.

Broad-Band Analysis of VLF/LF Aircraft Wire Antennas

The broad-band response of a VLF/LF dual-wire aircraft antenna is analyzed. The impedance properties and the induced currents on the two wires of different lengths are obtained via a superposition procedure in which the original problem is split into two transmission-line (differential-mode current) problems and two antenna (common-mode current) problems. Results for the input admittance and short-circuit current of a representative VLF/LF dual-wire antenna are presented.

Broad-band analysis of VLF/LF aircraft wire antennas

The broad-band response of a VLF/LF dual-wire aircraft antenna is analyzed. The impedance properties and the induced currents on the two wires of different lengths are obtained via a superposition procedure in which the original problem is split into two transmission-line (differential-mode current) problems and two antenna (common-mode current) problems. Results for the input admittance and short-circuit current of a representative VLF/LF dual-wire antenna are presented.