<html><head></head><body><div style="color:#000; background-color:#fff; font-family:bookman old style, new york, times, serif;font-size:16px"><div id="yui_3_16_0_ym19_1_1475861230256_5067"><span id="yui_3_16_0_ym19_1_1475861230256_5119">Hi Everyone, I am working on simulations of parabolic trough power plant and facing problem in finding a controller which will "ON" the power plant model only when there is solar radiations falling on solar collectors and "OFF" when there is no solar radiations falling on collectors!</span></div><div></div><div id="yui_3_16_0_ym19_1_1475861230256_5074"> </div><div class="signature" id="yui_3_16_0_ym19_1_1475861230256_5075"><div id="yiv3530382321yui_3_16_0_1_1456558635882_3898" dir="ltr" style="font-family:'bookman old style', 'new york', times, serif;"><span class="yiv3530382321" id="yiv3530382321yui_3_16_0_1_1456558635882_6044" style="font-weight:700;"><span class="yiv3530382321" id="yiv3530382321yui_3_16_0_1_1456558635882_6045"><font id="yiv3530382321yui_3_16_0_1_1456558635882_6223" color="#652191"><span id="yiv3530382321yui_3_16_0_1_1456558635882_4872" class="yiv3530382321" style="font-size:13px;"><span id="yiv3530382321yui_3_16_0_1_1456558635882_4874" class="yiv3530382321" style="font-size:medium;">Asad Riaz,</span></span></font></span></span></div><div id="yiv3530382321yui_3_16_0_1_1456558635882_3898" dir="ltr"><span class="yiv3530382321" id="yui_3_16_0_ym19_1_1475861230256_5083"><span class="yiv3530382321" style="font-size:small;" id="yui_3_16_0_ym19_1_1475861230256_5082"><font color="#652191" id="yui_3_16_0_ym19_1_1475861230256_5081"><span class="yiv3530382321" id="yui_3_16_0_ym19_1_1475861230256_5080"><span style="font-family:'bookman old style', 'new york', times, serif;" id="yui_3_16_0_ym19_1_1475861230256_5079">MS Energy Systems Engineering,</span></span><br id="yiv3530382321yui_3_16_0_1_1456558635882_4880" class="yiv3530382321">U.S.-Pakistan Center for Advanced Studies in Energy,<br></font></span></span></div><div id="yiv3530382321yui_3_16_0_1_1456558635882_3898" dir="ltr"><span style="font-size:small;color:rgb(101, 33, 145);font-family:'bookman old style', 'new york', times, serif;" id="yui_3_16_0_ym19_1_1475861230256_7560">NUST, Sector H-12, Islamabad, Pakistan.</span></div><div id="yiv3530382321yui_3_16_0_1_1456558635882_3898" dir="ltr"><span style="color: rgb(101, 33, 145); font-size: small;" id="yui_3_16_0_ym19_1_1475861230256_7638">Email: asadriaz2999@yahoo.com</span><span style="font-size:small;color:rgb(101, 33, 145);font-family:'bookman old style', 'new york', times, serif;"><br></span></div></div></div></body></html>