The study of the battery charge process as the only power storage agent in off-grid systems is of significant importance. The battery charge process has different modes, and the battery in these modes is dependent on the amount of charge. In order to charge the battery in off-grid systems, two charge controllers including Pulse Width Modulation (PWM) and Maximum Power Point Tracker (MPPT) are c...

We develop an analytical model of a separating equilibrium for a two-tier fee-based and sponsored-based information Web site. We examine the monopolist’s choice of content quality and price for a feebased site targeted at high type consumers and the content quality level for a sponsored site offered free to all consumers. We show how a reduction in the potential for advertising revenues results...

The work is devoted to the calculation of main technological parameters a bit new patented design, essence which replace worn out working elements (carbide cutters or diamond-containing matrices) during drilling with new, not blunt tool right at bottom well. need correct method associated design feature crown, consists in fact that when using it, an annular larger width formed compared serial c...

CONTEXT Individuals searching the Internet for vaccine information may find antivaccination Web sites. Few published studies have systematically evaluated these sites. OBJECTIVES To examine antivaccination Web site attributes and to delineate the specific claims and concerns expressed by antivaccination groups. DESIGN AND SETTING In late 2000, using a metasearch program that incorporates 10...

Suitable pattern design of drilling and blasting is very important in open pit mines. Using explosive energy for rock fragmentation with minimum cost production one the purposes The most parameters are including diameter hole, specific charge, burden thickness suitable dimensions fragmentation. In this paper, charge calculated based on quality mass then definition maximum mines calculated. a ne...