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  2. Past paper - Wikipedia

    en.wikipedia.org/wiki/Past_paper

    A past paper is an examination paper from a previous year or previous years, usually used either for exam practice or for tests such as University of Oxford, [1] [2] University of Cambridge [3] College Collections. Exam candidates find past papers valuable in test preparation.

  3. Precipitation (chemistry) - Wikipedia

    en.wikipedia.org/wiki/Precipitation_(chemistry)

    [12] In metallurgy, precipitation from a solid solution is also a way to strengthen alloys. Precipitation of ceramic phases in metallic alloys such as zirconium hydrides in zircaloy cladding of nuclear fuel pins can also render metallic alloys brittle and lead to their mechanical failure.

  4. 1,5-Diazabicyclo (4.3.0)non-5-ene - Wikipedia

    en.wikipedia.org/wiki/1,5-Diazabicyclo(4.3.0)non...

    1,5-Diazabicyclo[4.3.0]non-5-ene (DBN) is a chemical compound with the formula C 7 H 12 N 2. [1] It is an amidine base used in organic synthesis. A related compound with related functions is 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU). The relatively complex nature of the formal names for DBU and DBN (hence the common use of acronyms) reflects the ...

  5. Bottom-up and top-down design - Wikipedia

    en.wikipedia.org/wiki/Bottom-up_and_top-down_design

    [12] Studies in task switching and response selection show that there are differences through the two types of processing. Top-down processing primarily focuses on the attention side, such as task repetition. [13] Bottom-up processing focuses on item-based learning, such as finding the same object over and over again. [13]

  6. Aristotle - Wikipedia

    en.wikipedia.org/wiki/Aristotle

    Referring then to the previous example, it can be said that an actuality is when a plant does one of the activities that plants do. [ 55 ] For that for the sake of which ( to hou heneka ) a thing is, is its principle, and the becoming is for the sake of the end; and the actuality is the end, and it is for the sake of this that the potentiality ...

  7. Propositional calculus - Wikipedia

    en.wikipedia.org/wiki/Propositional_calculus

    This is an imperfect analogy with chemistry, since a chemical molecule may sometimes have only one atom, as in monatomic gases.) [49] The definition that "nothing else is a formula", given above as Definition 3 , excludes any formula from the language which is not specifically required by the other definitions in the syntax. [ 37 ]

  8. John Stuart Mill - Wikipedia

    en.wikipedia.org/wiki/John_Stuart_Mill

    The question in every case is whether the words used are used in such circumstances and are of such a nature as to create a clear and present danger that they will bring about the substantive evils that Congress has a right to prevent.

  9. Logology (science) - Wikipedia

    en.wikipedia.org/wiki/Logology_(science)

    A dozen years later, Polish husband-and-wife sociologists Stanisław Ossowski and Maria Ossowska (the Ossowscy) took up the same subject in an article on "The Science of Science" [11] whose 1935 English-language version first introduced the term "science of science" to the world. [12]