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Software simulations indicate that the single-switch ac / dc SEPIC exhibits an increase in power production of 25 % in the lower 25 % of usable wind speeds over the single-switch ac / dc buck converter , and an increase in power production of 5 % in the lower 10 % of usable wind speeds over a modified six-pulse phase-controlled rectifier , with less cost and comparable efficiency . In addition , each week we will focus on a different key security concern , which are unfortunately all too familiar : identity theft , online safety , laptop security , copyright and filesharing , spyware , and phishing . With warmth and company , dishes like salsicce e formaggio , spezzatino di vitello , coniglio , and schiz are accompanied by generous portions of freshly cooked polenta . Beta-blockers can be misused in such sports as archery , diving , and gymnastics . A six-pulse phase-controlled rectifier , a single-switch unidirectional ac / dc buck converter , and a single-switch ac / dc single-ended primary inductance converter ( SEPIC ) are developed and simulated using software-modeling techniques to calculate power output and efficiencies determined by wind turbine and electrolyzer operational characteristics . Several classes ( e.g ., Spanish , English , journalism , and social science ) have developed ELSI newsletters for distribution to parents .