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  2. Course Hero - Wikipedia

    en.wikipedia.org/wiki/Course_Hero

    Subscribers can download complete papers that were submitted by previous students and submit them as their own work. Additionally, the site allows students to upload homework and get completed work solutions from the site's contracted workers: an 'Essay mill' business. Users who upload content can use the site for free while others pay a fee. [10]

  3. Alpha process - Wikipedia

    en.wikipedia.org/wiki/Alpha_process

    The other class is a cycle of reactions called the triple-alpha process, which consumes only helium, and produces carbon. [1] The alpha process most commonly occurs in massive stars and during supernovae. Both processes are preceded by hydrogen fusion, which produces the helium that fuels both the triple-alpha process and the alpha ladder ...

  4. Fractional crystallization (geology) - Wikipedia

    en.wikipedia.org/wiki/Fractional_crystallization...

    1: olivine crystallizes; 2: olivine and pyroxene crystallize; 3: pyroxene and plagioclase crystallize; 4: plagioclase crystallizes. At the bottom of the magma reservoir, a cumulate rock forms. Fractional crystallization , or crystal fractionation , is one of the most important geochemical and physical processes operating within crust and mantle ...

  5. Pyramid (image processing) - Wikipedia

    en.wikipedia.org/wiki/Pyramid_(image_processing)

    Visual representation of an image pyramid with 5 levels. Pyramid, or pyramid representation, is a type of multi-scale signal representation developed by the computer vision, image processing and signal processing communities, in which a signal or an image is subject to repeated smoothing and subsampling.

  6. Port (circuit theory) - Wikipedia

    en.wikipedia.org/wiki/Port_(circuit_theory)

    For instance, in the figure example (c), if the poles 2 and 4 are each split into two poles each then the circuit can be described as a 3-port. However, it is also possible to connect generators to pole pairs (1, 3), (1, 4), and (3, 2) making 4 C 2 = 6 generators in all and the circuit has to be treated as a 6-port.

  7. Technology and Livelihood Education - Wikipedia

    en.wikipedia.org/wiki/Technology_and_Livelihood...

    The Technical-Vocational Education-based TLE is focused on technical skills development in any area. Five common competencies, based on the training regulations of the Technical Education and Skills Development Authority (TESDA), are covered in the exploratory phase (Grades 7 and 8): mensuration and calculation, technical drafting, use of tools and equipment, maintenance of tools and equipment ...

  8. Power electronics - Wikipedia

    en.wikipedia.org/wiki/Power_electronics

    An HVDC thyristor valve tower 16.8 m tall in a hall at Baltic Cable AB in Sweden A battery charger is an example of a piece of power electronics. Power grid designer in front of a newly installed 880kV thyristor valve array A PCs power supply is an example of a piece of power electronics, whether inside or outside of the cabinet.

  9. Square packing - Wikipedia

    en.wikipedia.org/wiki/Square_packing

    [1] Some numbers of unit squares are never the optimal number in a packing. In particular, if a square of size a × a {\displaystyle a\times a} allows the packing of n 2 − 2 {\displaystyle n^{2}-2} unit squares, then it must be the case that a ≥ n {\displaystyle a\geq n} and that a packing of n 2 {\displaystyle n^{2}} unit squares is also ...

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