A process for forming an aerosol of semiconductor nanoparticles includes pyrolyzing a semiconductor material-containing gas then quenching the gas being pyrolyzed to control particle size and prevent uncontrolled coagulation. In particular, a shift register stage circuit is adapted to operate with a low voltage swing clock signal, with the stage circuit having a single state node, a, driven directly. Other embodiments may be described andor claimed. On the contrary, the second housing is kept at one of the first angle position, the second angle position, and a third angle position between the first and the second angle positions, when an operation of the operating portion is not available. The method also includes forming a second insulation layer structure pattern comprising a second opening by etching a portion of the first insulation layer structure, filling the second opening with a non-single-crystalline silicon-germanium layer, and forming a single-crystalline silicon-germanium pattern by irradiating a second laser beam onto the non-single-crystalline silicon-germanium layer. The connector also has a separate coupling member which has opposite right-hand and left-hand threaded ends to threadedly mate with the threads of the two tubular members.