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  1. Reverse osmosis (RO) is a water purification process that uses a semi-permeable membrane to separate water molecules from other substances. RO applies pressure to overcome osmotic pressure that favors even distributions.

  2. Electrodialysis. Electrodialysis ( ED) is used to transport salt ions from one solution through ion-exchange membranes to another solution under the influence of an applied electric potential difference. This is done in a configuration called an electrodialysis cell. The cell consists of a feed (dilute) compartment and a concentrate ( brine ...

  3. Anime and manga portal. The Duke of Death and His Maid ( Japanese: 死神坊ちゃんと黒メイド, Hepburn: Shinigami Botchan to Kuro Meido) is a Japanese romantic comedy manga series by Koharu Inoue. It was serialized online via Shogakukan 's Sunday Webry website from October 2017 to May 2022, with its chapters collected in sixteen ...

  4. The YES stroke alphabetical order, also called YES stroke-order sorting, briefly YES order or YES sorting, is a Chinese character sorting method based on a stroke alphabet and stroke orders. It is a simplified stroke-based sorting method free of stroke counting and grouping. [1] [2] [3] YES order has been applied to the indexing of Xinhua ...

  5. In linear algebra, a rotation matrix is a transformation matrix that is used to perform a rotation in Euclidean space. For example, using the convention below, the matrix. rotates points in the xy plane counterclockwise through an angle θ about the origin of a two-dimensional Cartesian coordinate system.

  6. Definition. The Reynolds number is the ratio of inertial forces to viscous forces within a fluid that is subjected to relative internal movement due to different fluid velocities. A region where these forces change behavior is known as a boundary layer, such as the bounding surface in the interior of a pipe.

  7. Franklin Delano Roosevelt[a] (January 30, 1882 – April 12, 1945), commonly known by his initials FDR, was an American politician who served as the 32nd president of the United States from 1933 until his death in 1945. He is the only U.S. president to have served more than two terms. His initial two terms were centered on combating the Great ...

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