An integrally woven three-dimensional preform with stiffeners in two directions constructed from a woven base fabric having first, second and third woven fabrics. An intrinsic semiconductor nanowire having constant lateral dimensions is grown at a low enough temperature so that pyrolysis of the reactant is suppressed on the sidewalls of the intrinsic semiconductor nanowire. The tip seal comprises a sealing material in the tip-seal groove and a backup material between the sealing material and the bottom of the tip-seal groove. Also, since pyrolytic decomposition is performed separately in a later process, a stable reaction may be assured, so that a film of uniform thickness and quality may be deposited. The electrical load management control unit shifts power extraction between the first and second AC power sources by changing an AC voltage output of one of the first and second AC power sources relative to an AC voltage output of the other of the first and second AC power sources, thereby changing an DC voltage output to the first DC bus from one of the first and second AC to DC rectifiers.