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  2. Plesiochronous digital hierarchy - Wikipedia

    en.wikipedia.org/wiki/Plesiochronous_Digital...

    The worst possible stuffing ratio would be 1 frame in 2, as this gives a theoretical 0.5 bit of jitter. Therefore, the stuffing ratio is carefully chosen to give theoretical minimum jitter. In a practical system however, the actual decision to stuff or not may be made by comparing the read address and write address of the input buffer store.

  3. List of chemical databases - Wikipedia

    en.wikipedia.org/wiki/List_of_chemical_databases

    chemical database substances CAS Search; suppliers "Chemindex". Clival Database Clinical Trail Database Clinical Trail Data Solutions 50,000 molecules clinical trail data Phase 0 to IV indications "clival". CMNPD Comprehensive Marine Natural Products Database Peking University: from literature and other databases structural classification; species

  4. List of online databases - Wikipedia

    en.wikipedia.org/wiki/List_of_online_databases

    Informit (database) Inorganic Crystal Structure Database; Interment.net; Internet Adult Film Database; Internet Archive; Internet Broadway Database; Internet Movie Cars Database; Internet Movie Firearms Database; Internet Off-Broadway Database; Internet Public Library; Internet Speculative Fiction Database; Internet Theatre Database; ISBNdb.com

  5. Physical schema - Wikipedia

    en.wikipedia.org/wiki/Physical_schema

    A physical data model (or database design) is a representation of a data design as implemented, or intended to be implemented, in a database management system. In the lifecycle of a project it typically derives from a logical data model , though it may be reverse-engineered from a given database implementation.

  6. PDH - Wikipedia

    en.wikipedia.org/wiki/PDH

    PDH may refer to: Angiotensin-converting enzyme, an enzyme; Plesiochronous digital hierarchy, in telecommunications networks; Pound–Drever–Hall technique for stabilizing a laser's output; Pyranose dehydrogenase (acceptor), an enzyme; Pyruvate dehydrogenase, an enzyme

  7. Pound–Drever–Hall technique - Wikipedia

    en.wikipedia.org/wiki/Pound–Drever–Hall...

    The Pound–Drever–Hall (PDH) technique is a widely used and powerful approach for stabilizing the frequency of light emitted by a laser by means of locking to a stable cavity. The PDH technique has a broad range of applications including interferometric gravitational wave detectors , atomic physics , and time measurement standards , many of ...

  8. Protein Data Bank (file format) - Wikipedia

    en.wikipedia.org/wiki/Protein_Data_Bank_(file...

    The PDB file format was invented in 1972 [2] [3] as a human-readable file that would allow researchers to exchange the atomic coordinates in a given protein through a database system. Its fixed-column width format is limited to 80 or 140 [ 4 ] columns, which was based on the width of the computer punch cards that were previously used to ...

  9. Database search engine - Wikipedia

    en.wikipedia.org/wiki/Database_search_engine

    Database or structured data search (e.g. Dieselpoint). Mixed or enterprise search (e.g. Google Search Appliance ). The largest online directories, such as Google and Yahoo , utilize thousands of computers to process billions of website documents using web crawlers or spiders (software) , returning results for thousands of searches per second.