Disclosed herein is a fastening structure which enables objects to be easily coupled to or removed from each other, and which enables the relative positions between the objects to be changed in the longitudinal position of zipper rails. The present invention also provides a simplified hydrogen production system, which includes the catalytic steam reforming and subsequent high temperature water gas shift of low-sulfur hydrocarbon fuels followed by hydrogen purification through the pressure swing adsorption. The cooling is provided by ice and the like. Light users of service, on the other hand, are assigned lower cost synchronization parameters, such as longer synchronization intervals andor decreased synchronization data quantities . Said vessel and handle are made from non-toxic porcelain ceramic, glass, wire reinforced glass, or similar material with density that is greater than liquid water.