At least one exemplary embodiment is directed to a website configured to collect sound signatures from around the world and beyond. A desired electromagnetic flux skin depth for heating the material within the crucible may be selected, and a frequency of an alternating current for energizing the inductor and for producing the desired skin depth may be selected. In specific embodiments, the invention provides methods for inducing and stabilizing nitrile hydratase activity, amidase activity, and asparaginase I activity. The pulley base is fixed with a pulley rod having its pulley fitted in the rail groove of a sliding rail, enabling the window curtain to be assembled, shrunk or expanded. The storage pocket and its contents are concealed when the backrest is lowered and are accessible when the backrest is inclined.