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A certified reference material is a particular form of measurement standard. Reference materials are particularly important for analytical chemistry and clinical analysis. [2] Since most analytical instrumentation is comparative, it requires a sample of known composition (reference material) for accurate calibration.
Occasionally, reference collections (notably, highly specific and specialized collections or art collections) can be found in private ownership. As new knowledge emerges and older materials become less relevant or outdated, the reference collection may undergo periodic reviews and updates to ensure its continued usefulness and reliability. [2]
In library science, special collections (Spec. Coll. or S.C.) are libraries or library units that house materials requiring specialized security and user services.Special collections can be found in many different organisations including research libraries, universities, colleges, schools, national libraries, public libraries, museums, art galleries, archives, historic houses, cathedrals ...
Special libraries may or may not be open to the general public. Those that are open to the public may offer services similar to research, reference, public, academic, or children's libraries, often with restrictions such as only lending books to patients at a hospital or restricting the public from parts of a military collection. Many special ...
The δ values and absolute isotope ratios of common reference materials are summarized in Table 1 and described in more detail below. Alternative values for the absolute isotopic ratios of reference materials, differing only modestly from those in Table 1, are presented in Table 2.5 of Sharp (2007) [1] (a text freely available online), as well as Table 1 of the 1993 IAEA report on isotopic ...
Chemicals that meet this standard may be sold as "ACS Reagent Grade" materials. Reagent standards relieve chemists of concern over chemical purity. "ACS Reagent Grade", is regarded as a gold standard measure and is in some cases required for use in chemical manufacturing, usually where stringent quality specifications and a purity of equal to ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 26 December 2024. Organized collection of books or other information resources For other uses, see Library (disambiguation). Library patron retrieving a book from a shelf A library is a collection of books, and possibly other materials and media, that is accessible for use by its members and members of ...
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