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  2. List of PDF software - Wikipedia

    en.wikipedia.org/wiki/List_of_PDF_software

    List of PDF software This is a list of links to articles on software used to manage Portable Document Format (PDF) documents. The distinction between the various functions is not entirely clear-cut; for example, some viewers allow adding of annotations, signatures, etc. Some software allows redaction, removing content irreversibly for security.

  3. Sensitive compartmented information facility - Wikipedia

    en.wikipedia.org/wiki/Sensitive_compartmented...

    A sensitive compartmented information facility ( SCIF / skɪf / ), in United States military, national security/national defense and intelligence parlance, is an enclosed area within a building that is used to process sensitive compartmented information (SCI) types of classified information . SCIFs can be either permanent or temporary and can ...

  4. List of amateur radio modes - Wikipedia

    en.wikipedia.org/wiki/List_of_amateur_radio_modes

    Modes of communication Amateurs use a variety of voice, text, image, and data communications modes over radio. Generally new modes can be tested in the amateur radio service, although national regulations may require disclosure of a new mode to permit radio licensing authorities to monitor the transmissions. Encryption, for example, is not generally permitted in the Amateur Radio service ...

  5. Topic model - Wikipedia

    en.wikipedia.org/wiki/Topic_model

    Topic model. In statistics and natural language processing, a topic model is a type of statistical model for discovering the abstract "topics" that occur in a collection of documents. Topic modeling is a frequently used text-mining tool for discovery of hidden semantic structures in a text body. Intuitively, given that a document is about a ...

  6. Metacognition - Wikipedia

    en.wikipedia.org/wiki/Metacognition

    Metacognition refers to a level of thinking and metacognitive regulation, the regulation of cognition and subsequent learning experiences that help people enhance their learning through a set of activities. It involves active metacognitive control or attention over the process in learning situations.

  7. In race to regain rare earth glory, Europe falls short on ...

    www.aol.com/news/race-regain-rare-earth-glory...

    Four decades ago, a rare earth processing plant on France's Atlantic coast was one of the largest in the world, churning out materials used to make colour televisions, arc lights and camera lenses ...

  8. PDF - Wikipedia

    en.wikipedia.org/wiki/PDF

    Portable Document Format ( PDF ), standardized as ISO 32000, is a file format developed by Adobe in 1992 to present documents, including text formatting and images, in a manner independent of application software, hardware, and operating systems. [2] [3] Based on the PostScript language, each PDF file encapsulates a complete description of a fixed-layout flat document, including the text ...

  9. Radar beacon - Wikipedia

    en.wikipedia.org/wiki/Radar_beacon

    Radar beacon (short: racon) is – according to article 1.103 of the International Telecommunication Union's (ITU) ITU Radio Regulations (RR) [1] – defined as "A transmitter-receiver associated with a fixed navigational mark which, when triggered by a radar, automatically returns a distinctive signal which can appear on the display of the triggering radar, providing range, bearing and ...