![]() ![]() If wetted, they offer self-priming performance. Rotary pumps can handle solids (e.g., cherries and olives), slurries, pastes, and a variety of liquids. Lobe pump (5m³/min or 1886 barrel/h) of THW They are popular in these diverse industries because they offer superb sanitary qualities, high efficiency, reliability, corrosion resistance and good clean-in-place and steam-in-place (CIP/SIP) characteristics. Lobe pumps are used in a variety of industries including pulp and paper, chemical, food, beverage, pharmaceutical, and biotechnology. An early example of a lobe pump is the Roots Blower, patented in 1860 to blow combustion air to melt iron in blast furnaces, but now more commonly used as an engine supercharger. It is similar to a gear pump except the lobes are designed to almost meet, rather than touch and turn each other. JSTOR ( January 2019) ( Learn how and when to remove this template message)Ī lobe pump, or rotary lobe pump, is a type of positive displacement pump.Unsourced material may be challenged and removed. ![]() Please help improve this article by adding citations to reliable sources. For a given Content Type, any requirements or restrictions on the type of content that can be contained in the SIP will be described in that Content Type's Preservation Action Plan.This article needs additional citations for verification.The format of the SIP may vary from submitter to submitter, based on the submitters willingness and ability to provide the content and metadata in a specific format.The information package that is delivered to McMaster University digital repositories for use in the construction of one or more AIPs.In turn, the AIP contains metadata tying it back to the SIP. The DIP is retrieved using the URI for the corresponding AIP.Context information is provided in the form of links to other items in a given collection.Depending on the level of access, a user can see basic object metadata and a link to the object article as available.User access to archival objects is generally provided through the McMaster University Digital Archive website.McMaster University Library's DIPs are always generated from a single AIP.OAIS describes a DIP as "the Information Package, derived from a part, or all, of one or more AIPs, received by the Consumer in response to a request to the OAIS.".In all cases, the descriptive metadata will be recreated within the preservation metadata. McMaster University Library preservation metadata packages both the descriptive and preservation metadata together.ĭepending on the type of CDO, the format of this descriptive metadata can vary (MODS or Dublin Core), but is selected to maximize findability. This information can be used to determine integrity of an object being copied within the system (as in the case of a change in storage location), or for periodic integrity checks. Examples of these relationships can include: a newer version of an object that supersedes an older one.įixity Information - Fixity information is generated at the time of ingest in order to later determine whether or not the item remains in the same state as when it was ingested. Provenance Information - Provenance metadata is maintained for each object that provides a history of preservation events in the object's lifetime, beginning at ingest into the digital repositories and referencing any preservation activities taken on the object (e.g., replacement due to corruption, format migration, etc.).Ĭontext Information - As appropriate, information on how a CDO relates to other CDOs or to other conceptual entities. Reference Information - Identifiers are stored for each object identifying it globally (e.g. Preservation Description Information (PDI) Representation Information is maintained, and contains information on the CDO's file format, version, and a reference to a format registry in order to provide information on how to interpret the file. The Content Data Object (CDO) is generally stored with the primary preservation metadata file, which is held in Fedora Commons. This description will use the OAIS Information Model to illustrate completeness of our conceptual model, and will describe, in general terms, what a McMaster University Library AIP looks like. The level of content in a McMaster University Digital Archive AIP can vary, depending on the amount of content provided by the submitter. The information package consisting of the Content Information (CI), Preservation Description Information (PDI), Packaging Information (PI), and Descriptive Information (DI) that is archived at McMaster University Library.
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