In a process for producing sec-butylbenzene, a C4 olefinic hydrocarbon feedstock comprising isobutene and at least one n-butene is contacted with methanol andor water in the presence of an acid catalyst to selectively oxygenate isobutene to produce an effluent stream rich in n-butene and containing less isobutene than the feedstock. Where neither the feature information nor the energy of the other terminal is detected based on a determination of the sensing unit, the transmission processing unit transmits the remaining divided data. The first portion extends along a first axis from a first port, the second portion extends along a second axis from a second port, and the intermediate portion connects the first and second portions. The outputs of these amplifiers are inputted to differential amplifier, whose output is compared by comparator with a prescribed value generated by reference value generator. An automated or semi-automated segmentation and editing system and methods are also disclosed for lung segmentation and identification of lung fissures. Because of the specialized opposed junctions overdistraction between the adjacent vertebral bodies is avoided when the implant is rotated from an initial insertion position to a final deployed position.