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The first of the Dongfeng missiles, the DF-1 (SS-2, codenamed '1059', initially 'DF-1' , later the DF-3 [1]), was a licensed copy of the Soviet R-2 (SS-2 Sibling) short-range ballistic missile (SRBM), [2] based on the German V-2 rocket. The DF-1 had a single RD-101 rocket engine, and used alcohol for fuel with liquid oxygen (LOX) as an oxidizer ...
Methylphosphonyl difluoride (DF), also known as EA-1251 [2] or difluoro, [3] is a chemical weapon precursor. Its chemical formula is CH 3 POF 2 . It is a Schedule 1 substance under the Chemical Weapons Convention .
The direction flag is a flag that controls the left-to-right or right-to-left direction of string processing, [1] stored in the FLAGS register on all x86-compatible CPUs. [2] It is bit number 10.
The original notation employed by Gottfried Leibniz is used throughout mathematics. It is particularly common when the equation y = f(x) is regarded as a functional relationship between dependent and independent variables y and x.
In mathematics, the total derivative of a function f at a point is the best linear approximation near this point of the function with respect to its arguments. Unlike partial derivatives, the total derivative approximates the function with respect to all of its arguments, not just a single one.
The set of all velocities through a given point of space is known as the tangent space, and so df gives a linear function on the tangent space: a differential form. With this interpretation, the differential of f is known as the exterior derivative , and has broad application in differential geometry because the notion of velocities and the ...
Foxit Software was founded in 2001 [7] by Eugene Y. Xiong (Chinese: çéšć), a Chinese national with permanent residence in the United States, [4] to develop similar PDF software products to those from Adobe Systems and other PDF vendors, and offer them at lower prices. [12]
Carbonless copy paper; Photographic processes: Reflex copying process (also reflectography, reflexion copying) Breyertype, Playertype, Manul Process, Typon Process, Dexigraph, Linagraph; Daguerreotype; Salt print; Calotype (the first photo process to use a negative, from which multiple prints could be made) Cyanotype; Photostat machine; Rectigraph