P. Ivančić et al: Search and Rescue Radar... 1. MODEL FOR CALCULATING THE TRANSPONDER’S RADIO HORIZON / Model za izračun radio horizonta odgovarača The radar horizon is typically calculated according to the radio horizon pattern derived from the calculation of the geometric horizon [8]. The geometric horizon (Gh) for the values: r – radius of the Earth ≈ 6378 km or 3440 NM ha – height of aerial...

A new approach to portable photo-voltaic systems which described in this paper is of very low power (5W) and main purpose is for recharging or powering small portable electronics devices. The objects of this study are: i) the optimization of photo-voltaic cells connection with regard to portable conditions; a nonstandard topology is adopted, to compensate shadowing or nonoptimal orientation; ii...

This article applies nonlinear programming techniques to optimize humidification-dehumidification (HD) desalination cycles for operating conditions that result in maximum gained output ratio (GOR). Closed air open water as well as open air open water cycles, each with either an air or a water heater, were considered in this analysis. Numerical optimization resulted in a substantial increase in ...

This report describes a class of operating system protection errors known as ^insufficient validation of critical conditions," or simply "validation errors," and outlines a scheme for finding them. This class of errors is recognized as a very broad one, lying outside the scope of the basic protection mechanisms of existing systems; the extent of the problem is illustrated by a set of validation...