A swiveling locking mechanism of a telescopic rod of a mop, including: an internal clamping sleeve, an external clamping cylinder, and a U-shaped locking arm. The method and apparatus can be applied to liquid chromatography impurity detection using UV-VIS spectrophotometry based on robust matrix algebra representing the entire spectral space generated by the sample. The user-defined type chain information defines a user-defined type chain including second ones of the video segments by describing a reproduction order of the second video segments. The storage element, heater element, and first and second pairs of dielectric spacers can be made by a spacer patterning technique. Oxygen from the circulating regeneration gas reacts with the coke to provide water and carbon dioxide.