PCP systems have several unique design and operating features that promote their selection for many applications:Planning requirements can be assumed unilaterally by the developer or in agreement between the developer and a local planning authority. Figure 15.18 – Flow diagram to illustrate the design process of PCP systems. This section contains weapons that are in development, but are not currently available in the alpha, beta or public release versions. At the institutional level, there are several ways to create wikis for faculties, including free and open source software, institutional subscriptions for hosted software, and wikis embedded in the institution`s LMS. Some institutions may prefer to host wikis themselves by creating “wiki farms” on university servers with open source wiki software such as MediaWiki or Twiki. Self-hosting offers administrative control and data, but it comes with administrative fees for installing patches and updates, as well as spamming issues.5 hosted services like PBWorks, Wikispaces and Wetpaint offer institutional subscriptions for fully functional, ad-free wikis, although the most promising solution for institutions may be to include wikis in the LMS. Some LMS providers, such as Angel and Moodle, already provide wikis embedded in course documents, while others, such as Blackboard, promise that future publications will include built-in wikis. The precise method of vault construction developed strongly when Vault-Tec gained experience in the construction of these huge underground shelters. The first shelters were built with modern technology and combined prefabricated elements with poured concrete and modular machinery and electronics.  The Los Angeles-built demonstrator set the standard for this first generation of California-built Vaults, using the same technology for military and industrial construction as nuclear reactors, military bunkers or corporate research institutes.
 Vault-Tec quickly began to implement its own specific technologies. Vaults began to become more and more modular, with entire prefabricated sections built on the factory and mounted on site. Many second-generation emergency shelters have shown a combination of old and new technologies, with the only next-generation chests built on the East Coast, in Boston and in the Appalachians.  These have been built entirely with prefabricated sections, which reduce all necessary infrastructure, faucets and faucets with all necessary infrastructure, equipment and faucets, greatly reduced construction times.  Different philosophies have been implemented depending on the designer and the use. Some have given up housing in favour of separate dormitories for the sexes, where several residents would occupy the same room, or for one-bedroom blocks (with one or two beds, the first usually under warm bunks) and a living room, with communal toilets accessible in the corridors.  Other establishments, usually housed in accommodation, include clients, classrooms and even cigar lounges.  Introduction Progressive gable systems (PCPs) deduce their name from the unique and positive predatory pump that developed from the spiral-toothed wheel pump concept developed by Rene Moineau in the late 1920s.    Although these pumps are now most often referred to as running vacuum pumps (PCs), they are also called screw pumps or monk pumps.