In certain embodiments, a tower lifting system comprises a primary lifting system and a secondary lifting system. Injecting a first feed comprising a chain transfer agent system and ethylene into a first autoclave reactor zone operating at polymerization conditions to produce a first zone reaction product, the CTA system of the first reactor zone having a transfer activity Z1; and B. The second part is detecting embedded watermarks in a target sequence of images where the target sequence may have resulted from one or more attacks on an original sequence of images in which the watermarks were embedded. Each first posterior-form piece includes a bag for encasing a volume of gel. Also described are various approaches to fabricating a semiconductor package having a hermetically sealed region. According to an exemplary embodiment, the apparatus includes a digital signal source for providing a digital signal having a symbol rate, and a plurality of symbol shaping filters.