Contents:The paper describes the outlines of the computer program PIROFI (proglam for calculation of fields) which calculates 2-or 3-dimensional nonlinear magnetostatic fields, linear electrostatic or stationary electric fields, stationary nonlinear 2 dimensional eddy-current fields and stationary temperature distributions. The program uses the finite difference method. The calculations may be carried out in one of five different coordinate systems, two of them being 3-dimensional. A set of service programs for preparing the input data, analysing the results, data handling etc. simplifies the use of the program. Numerische

No abstract

Many countries have large unsealed road networks and although they carry low traffic volumes, they require substantial budgets for maintenance and contribute significantly to dust pollution, loss of resources, sedimentation and road accidents. Poor condition unsealed roads affect accessibility, productivity and economic growth, particularly in rural areas.

No abstract