Green's functions of potential problems in lens shaped geometries

The Kelvin inversion method will be outlined to determine the potential distribution due to a point charge (or the Green's function) in geometries bounded by flat and spherical surfaces

The condition number for circulant networks

In this paper we prove that it is possible to use techniques specific to electromagnetic field synthesis in the study of some electrical circuits. The definition of a circulant network will be presented. The system matrix of such a network is a circular matrix, which allows an analytical evaluation of all the eigenvalues and all the singular values. Resonance frequencies can then be calculated exactly as will be demonstrated on passive and active circulant networks

BEM calculation of the complex thermal impedance of microelectronic devices

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Quad configuration for improved thermal design of cascode current mirror

In this paper, the influence of a temperature gradient on the performance of a current mirror will be investigated. It will be proved that a new design based on a quad layout can make the current mirror almost insensitive to a temperature gradient

Current distribution modelling in electroconductive fabrics

In this paper the current distribution within woven electroconductive textile sheets is investigated.The iterative method of solving very large resistor networks, which is used to model current density in textile sheets, is discussed. Factors taken into account are the conductivity of the fibres, the contact resistance between the fibres, the contact angle between the fibres and supply electrodes, as well as the size and aspect ratio of textile sheets. The influence of these factors on sheet resistivity is discussed. Maps of the current distribution generated with a computer program are included

Evaluation or perfusion and thermal parameters of skiin tissue using cold provocation and thermographic measurements

Measurement of the perfusion coefficient and thermal parameters of skin tissue using dynamic thermography is presented in this paper. A novel approach based on cold provocation and thermal modelling of skin tissue is presented. The measurement was performed on a person’s forearm using a special cooling device equipped with the Peltier module. The proposed method first cools the skin, and then measures the changes of its temperature matching the measurement results with a heat transfer model to estimate the skin perfusion and other thermal parameters. In order to assess correctness of the proposed approach, the uncertainty analysis was performed