The article discusses a way to improve the survivability of the power system affected by the High Altitude Electromagnetic Pulse (HEMP) through establishment of inventory of electronic equipment replacement modules, particularly those of digital protective relays. It is shown that the known methods of spare parts quantity optimization cannot be used in this case. Thus, another method is offered...

BACKGROUND The use and abuse of psychoactive substances is very rampant, even in our secondary schools. In recent times, there has been a growing concern about negative effects of these substances on youths. The high incidence of school dropouts and other nefarious activities are the resultant impacts on the students. OBJECTIVES The objectives of the study were: (1) To determine the prevalenc...

This study aims to determine whether a significant decrease in airborne concentrations of Ambrosia pollen witnessed in the north-west of the Province of Milan in Northern Italy could be explained by environmental factors such as meteorology, or whether there is evidence to support the hypothesis that the decrease was related to the presence of large numbers of the oligophagous Ophraella communa...