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  2. Intraocular lens power calculation - Wikipedia

    en.wikipedia.org/wiki/Intraocular_lens_power...

    The aim of an accurate intraocular lens power calculation is to provide an intraocular lens (IOL) that fits the specific needs and desires of the individual patient. The development of better instrumentation for measuring the eye's axial length (AL) and the use of more precise mathematical formulas to perform the appropriate calculations have significantly improved the accuracy with which the ...

  3. Toric variety - Wikipedia

    en.wikipedia.org/wiki/Toric_variety

    The toric variety constructed from a fan is necessarily normal. Conversely, every toric variety has an associated fan of strongly convex rational cones. This correspondence is called the fundamental theorem for toric geometry, and it gives a one-to-one correspondence between normal toric varieties and fans of strongly convex rational cones. [2]

  4. Toric lens - Wikipedia

    en.wikipedia.org/wiki/Toric_lens

    Toric lens surface as "cap" (top-right) from a torus (here with R = 1.2 r). A toric lens is a lens with different optical power and focal length in two orientations perpendicular to each other. One of the lens surfaces is shaped like a "cap" from a torus (see figure at right), and the other one is usually spherical .

  5. Kane fracture zone - Wikipedia

    en.wikipedia.org/wiki/Kane_Fracture_Zone

    The Kane fracture zone is a medium-offset transform fault zone located on the Mid-Atlantic Ridge (MAR). [1] It lies just to the north of the Kane Megamullion, an oceanic core complex that forms the footwall of a long-lived low-angle detachment fault. [ 2 ]

  6. k·p perturbation theory - Wikipedia

    en.wikipedia.org/wiki/K·p_perturbation_theory

    In solid-state physics, the k·p perturbation theory is an approximated semi-empirical approach for calculating the band structure (particularly effective mass) and optical properties of crystalline solids.

  7. Appell's equation of motion - Wikipedia

    en.wikipedia.org/wiki/Appell's_equation_of_motion

    Moreover, it can be used to derive Kane's equations, which are particularly suited for describing the motion of complex spacecraft. [4] Appell's formulation is an application of Gauss' principle of least constraint .

  8. Polar Knowledge Canada - Wikipedia

    en.wikipedia.org/wiki/Polar_Knowledge_Canada

    Polar Knowledge Canada is a departmental corporation of the Government of Canada under the Crown–Indigenous Relations and Northern Affairs Canada (CIRNAC) portfolio.. It is responsible for monitoring, promoting, and disseminating knowledge of the polar regions (both Arctic and Antarctic), contributing to public awareness of the importance of polar science to Canada, enhancing Canada's ...

  9. Ample line bundle - Wikipedia

    en.wikipedia.org/wiki/Ample_line_bundle

    As a result, a basepoint-free line bundle L on any proper scheme X over a field is nef, meaning that L has nonnegative degree on every (irreducible) curve in X. [ 4 ] More generally, a sheaf F of O X {\displaystyle O_{X}} -modules on a scheme X is said to be globally generated if there is a set I of global sections s i ∈ H 0 ( X , F ...