This invention provides a method of converting heat energy to a more usable form using an externally-heated Brayton cycle. A distance between the board and an actuation portion is larger than another distance between the board and an engage portion under a locked state where the engage portion is engaged with an engaged portion. The invention provides a method for displaying a sequence of video images on a phosphor device comprising at least two types of phosphors together with the device comprising the means for implementing this method. A manual steering unit, such as a helm, is positioned at the main steering location and directly coupled to the AIU, wherein a switch selects between autopilot function rudder control and helm rudder control. The method includes measuring channel quality for a serving Base Station, if the channel quality is less than a threshold, measuring interference power from one or more neighbor BSs, determining a Precoding Matrix Index and a priority metric for each neighbor BS, and feeding back at least one of the PMI, a PMI type indicator, the priority metric, and the channel quality to the serving BS. Said cream can further comprises up to 4 wt % Dead Sea water.