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Pinwheel Nebula
Pinwheel may refer to: * Pinwheel (toy), a spinning children's toy * Pinwheel (cryptography), a device for producing a short pseudo-random sequence of bits * Pinwheel (shogi), an opening in the game shogi or Japanese chess * Pinwheel (TV channel), a channel which would later turn into Nickelodeon * ''Pinwheel'' (TV series), a children's show on Nickelodeon that ran from 1977 to 1984 * Pinwheel calculator (part of), a type of early mechanical arithmetic machine * Pinwheel escapement, part of a mechanical clock * ''Tabernaemontana divaricata'', also known as pinwheel flower * Pinwheel scheduling, problem of devising a rotating sequence of tasks with given frequencies * Pinwheel tilings, aperiodic tilings of the plane whose tiles appear in infinitely many orientations * Catherine wheel (firework), a form of pyrotechnic display device also known as a pinwheel * '' Coenocharopa elegans'', also known as the elegant pinwheel snail, a land snail found in Queensland, Australia * "Pinwhe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pinwheel (toy)
A pinwheel is a simple child's toy made of a wheel of paper or plastic curls attached at its axle to a stick by a pin. It is designed to spin when blown upon by a person or by the wind. History A similar toy had developed independently in Polynesia (known as ''pekapeka'' or ''peʻapeʻa'') using either coconut palm leaflets or strips of pandanus leaves; in colder climates like that of New Zealand (the toy also called ''pepepe'' in Māori), phormium leaves are used. Today's most popular style of pinwheels is rooted in East Asia. The design for example is typical of a japanese origami folding technique for a pinwheel. During the nineteenth century in the United States, any wind-driven toy held aloft by a running child was characterized as a whirligig, including pinwheels. Pinwheels provided many children with numerous minutes of enjoyment and amusement. See also * List of toys References External links How to Make a Pinwheelat wikiHow wikiHow is an online wik ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pinwheel (cryptography)
In cryptography, a pinwheel was a device for producing a short pseudorandom sequence of bits (determined by the machine's initial settings), as a component in a cipher machine. A pinwheel consisted of a rotating wheel with a certain number of positions on its periphery. Each position had a "pin", "cam" or "lug" which could be either "set" or "unset". As the wheel rotated, each of these pins would in turn affect other parts of the machine, producing a series of "on" or "off" pulses which would repeat after one full rotation of the wheel. If the machine contained more than one wheel, usually their periods would be relatively prime to maximize the combined period. Pinwheels might be turned through a purely mechanical action (as in the M-209) or electromechanically (as in the Lorenz SZ 40/42). Development The Swedish engineer Boris Caesar Wilhelm Hagelin is credited with having invented the first pinwheel device in 1925. He developed the machine while employed by Emanuel Nobel to o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pinwheel (shogi)
In shogi, the Pinwheel (風車 ''kazaguruma'') is an uncommon opening with the rook on the bottom rank 9 enabling it to switch between a Ranging Rook and Static Rook Static Rook (居飛車 ''ibisha'') Shogi opening, openings is one of two major opening strategies in shogi. In the opening, the major piece of the rook fights from its starting position on the right side of the board (the 2nd file for Black, Sente, ... attack. The pinwheel name comes from the way the king is able to rotate around the gold positioned on the 58 square as if it were a wheel. Against Static Rook Anaguma Example of development from Habu (1992). 1. P-76 P-84 2. S-68 P-34 3. P-66 S-62 4. R-58 K-42 5. K-48 K-32 6. K-38 B-33 7. P-56 P-54 8. S-48 8... K-22 9. S-66 S-53 10. P-46 L-12 11. P-36 K-11 12. S-47 S-32 13. G-48 P-85 14. B-77 G-52 15. N-37 P-44 16. P-55 16... Px55 17. Rx55 P*54 18. R-59 G-43 19. P-16 P-14 20. P-26 G-31 21. G-78 P-74 22. B-68 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pinwheel (TV Channel)
Nickelodeon (nicknamed Nick) is an American pay television channel and the flagship property of the Nickelodeon Group, a sub-division of the Paramount Media Networks division of Paramount Global. Launched on April 1, 1979, as the first cable channel for children, it is primarily aimed at children and adolescents aged 2 to 17, along with a broader family audience through its programming blocks. The channel began as a test broadcast on December 1, 1977, as part of QUBE, an early cable television system broadcast locally in Columbus, Ohio. On April 1, 1979, the channel was renamed Nickelodeon and launched to a new nationwide audience, with ''Pinwheel (TV series), Pinwheel'' as its inaugural program. The network was initially commercial-free and remained without advertising until 1984. Nickelodeon gained a rebranding in programming and image that year, and its ensuing success led to it and its sister networks MTV and VH1 being sold to Viacom (1952–2005), Viacom in 1985. Ni ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pinwheel (TV Series)
''Pinwheel'' is an American children's television series. It is the first series to have been broadcast on the then-rebranded Nickelodeon, and then the first on its Nick Jr. block as reruns until 1990. The target audience is preschoolers aged 2–5. It was created by Vivian Horner, an educator who spent her earlier career at the Children's Television Workshop, the company behind PBS's ''Sesame Street''. The show was geared to the "short attention span of preschoolers", with each episode divided into short, self-contained segments including songs, skits, and animations from all over the world. The series is set in a boarding house called Pinwheel House, which is powered by a pinwheel on the roof. The house's residents are a mix of live-action humans and puppets. Most songs are in the style of a wind-up music box. ''Pinwheel'' premiered on December 1, 1977, on Channel C-3 of QUBE's local cable system in Columbus, Ohio. In April 1979, Channel C-3 expanded into a national televi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pinwheel Calculator
A pinwheel calculator is a class of mechanical calculator described as early as 1685, and popular in the 19th and 20th century, calculating via wheels whose number of teeth were adjustable. These wheels, also called pinwheels, could be set by using a side lever which could expose anywhere from 0 to 9 teeth, and therefore when coupled to a counter they could, at each rotation, add a number from 0 to 9 to the result. By linking these wheels with carry mechanisms a new kind of calculator engine was invented. Turn the wheels one way and one performs an addition, the other way a subtraction. As part of a redesign of the arithmometer, they reduced by an order of magnitude the cost and the size of mechanical calculators on which one could easily do the four basic operations (add, subtract, multiply and divide). Pinwheel calculators became extremely popular with the success of Thomas' Arithmometer (manufactured 1850s) and Odhner Arithmometer (manufactured 1890s). History In "Mach ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pinwheel Escapement
An escapement is a mechanical linkage in mechanical watches and clocks that gives impulses to the timekeeping element and periodically releases the gear train to move forward, advancing the clock's hands. The impulse action transfers energy to the clock's timekeeping element (usually a pendulum or balance wheel) to replace the energy lost to friction during its cycle and keep the timekeeper oscillating. The escapement is driven by force from a coiled spring or a suspended weight, transmitted through the timepiece's gear train. Each swing of the pendulum or balance wheel releases a tooth of the escapement's ''escape wheel'', allowing the clock's gear train to advance or "escape" by a fixed amount. This regular periodic advancement moves the clock's hands forward at a steady rate. At the same time, the tooth gives the timekeeping element a push, before another tooth catches on the escapement's pallet, returning the escapement to its "locked" state. The sudden stopping of the escape ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tabernaemontana Divaricata
''Tabernaemontana divaricata'', commonly called pinwheel flower, crape jasmine, East India rosebay, and Nero's crown, is an evergreen shrub or small tree native to South Asia, Southeast Asia and China. In zones where it is not hardy it is grown as a house/glasshouse plant for its attractive flowers and foliage. The stem exudes a milky latex when broken, whence comes the name milk flower Description The plant generally grows to a height of and is dichotomously branched. The large shiny leaves are deep green and about in length and in width. The waxy blossoms are found in small clusters on the stem tips. The (single) flowers have the characteristic 'pinwheel' shape also seen in other genera in the family Apocynaceae such as '' Vinca'' and '' Nerium''. Both single and double-flowered forms are cultivated, the flowers of both forms being white. The plant blooms in spring but flowers appear sporadically all year. The flowers have a pleasing fragrance. More than 66 alkaloids are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pinwheel Scheduling
In mathematics and computer science, the pinwheel scheduling problem is a problem in real-time scheduling with repeating tasks of unit length and hard constraints on the time between repetitions. When a pinwheel scheduling problem has a solution, it has one in which the schedule repeats periodically. This repeating pattern resembles the repeating pattern of set and unset pins on the gears of a pinwheel cipher machine, justifying the name. If the fraction of time that is required by each task totals less than 5/6 of the total time, a solution always exists, but some pinwheel scheduling problems whose tasks use a total of slightly more than 5/6 of the total time do not have solutions. Certain formulations of the pinwheel scheduling problem are NP-hard. Definition The input to pinwheel scheduling consists of a list of tasks, each of which is assumed to take unit time per instantiation. Each task has an associated positive integer value, its maximum repeat time (the maximum time f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pinwheel Tiling
In geometry Geometry (; ) is a branch of mathematics concerned with properties of space such as the distance, shape, size, and relative position of figures. Geometry is, along with arithmetic, one of the oldest branches of mathematics. A mathematician w ..., pinwheel tilings are non-periodic tilings defined by Charles Radin and based on a construction due to John Conway. They are the first known non-periodic tilings to each have the property that their tiles appear in infinitely many orientations. Definition 250px, Conway's triangle decomposition into smaller similar triangles. Let T be the right triangle with side length 1, 2 and \sqrt. Conway noticed that T can be divided in five isometric copies of its image by the dilation of factor 1/\sqrt. 250px, The increasing sequence of triangles which defines Conway's tiling of the plane. 250px, A pinwheel tiling: tiles can be grouped in sets of five (thick lines) to form a new pinwheel tiling (up to rescaling) The pinwhe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Catherine Wheel (firework)
The Catherine wheel or pinwheel is a type of firework consisting either of a powder-filled spiral tube, or an angled rocket mounted with a pin through its center. When ignited, the energy of the fireworks not only create sparks and flame, but cause the wheel to quickly rotate, making the display much more spectacular. The physics of the process are those of an aeolipile. The firework is named after Saint Catherine of Alexandria who, according to Christian tradition, was condemned to death by " breaking on the wheel". When she touched the wheel, it miraculously fell to pieces. The largest Catherine wheel ever made was designed by the Lily Fireworks Factory of Mqabba, Malta. The Catherine wheel had a diameter of , and was lit on 18 June 2011, the eve of the annual feast of ''Our Lady of the Lilies''.In Malta, Catherine wheels are a traditional fixture during every village 'festa'. Some villages even hold competitions on the eve of the parish feast, while others display the vast w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coenocharopa Elegans
''Coenocharopa elegans'', the elegant pinwheel snail, is a species of air-breathing land snails in the family Charopidae Charopidae is a Taxonomy (biology), taxonomic family (biology), family of small air-breathing land snails (and semi-slugs such as ''Otoconcha dimidiata''), terrestrial molluscs, terrestrial pulmonate gastropod mollusks in the superfamily Punctoi .... It is found in Queensland, Australia. References External links ''Coenocharopa elegans'' at Biolib.cz''Coenocharopa elegans'' at the Atlas of Living Australia Charopidae Gastropods described in 2010 Fauna of Queensland Gastropods of Australia {{Charopidae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
