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  2. Woodpecker - Wikipedia

    en.wikipedia.org/wiki/Woodpecker

    Woodpeckers are capable of repeated pecking on a tree at high decelerations on the order of 10,000 m/s 2 (33,000 ft/s 2) (1000 g). [ 12 ] Some large woodpeckers such as Dryocopus have a fast, direct form of flight, but the majority of species have a typical undulating flight pattern consisting of a series of rapid flaps followed by a swooping ...

  3. Display resolution standards - Wikipedia

    en.wikipedia.org/wiki/Display_resolution_standards

    In the case of the 16:9 ratio, with 240 pixels high, the horizontal resolution should be 240 / 9 × 16 = 426. 6 (426 2 ⁄ 3), the closest multiple of 16 is 432. WQVGA has also been used to describe displays that are not 240 pixels high, for example, Sixteenth HD1080 displays which are 480 pixels wide and 270 or 272 pixels high.

  4. Image resolution - Wikipedia

    en.wikipedia.org/wiki/Image_resolution

    The image would be a very low quality image (72ppi) if printed at about 28.5 inches wide, but a very good quality (300ppi) image if printed at about 7 inches wide. The number of photodiodes in a color digital camera image sensor is often a multiple of the number of pixels in the image it produces, because information from an array of color ...

  5. History of paper - Wikipedia

    en.wikipedia.org/wiki/History_of_paper

    This text shows how papermakers were undertaking multiple steps to produce high-quality paper. This papermaking instruction or recipe is a chapter under the title of al-kâghad al-baladî (local paper) from the manuscript of al-Mukhtara'fî funûn min al-ṣunan attributed to al-Malik al-Muẓaffar , a Yemeni ruler of Rasulids .

  6. Neodymium magnet - Wikipedia

    en.wikipedia.org/wiki/Neodymium_magnet

    This gives the Nd 2 Fe 14 B compound a high saturation magnetization (J s ≈ 1.6 T or 16 kG) and a remanent magnetization of typically 1.3 teslas. Therefore, as the maximum energy density is proportional to J s 2 , this magnetic phase has the potential for storing large amounts of magnetic energy ( BH max ≈ 512 kJ/m 3 or 64 MG·Oe ).