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  2. Arago spot - Wikipedia

    en.wikipedia.org/wiki/Arago_spot

    Notation for calculating the wave amplitude at point P 1 from a spherical point source at P 0.. At the heart of Fresnel's wave theory is the Huygens–Fresnel principle, which states that every unobstructed point of a wavefront becomes the source of a secondary spherical wavelet and that the amplitude of the optical field E at a point on the screen is given by the superposition of all those ...

  3. Spot analysis - Wikipedia

    en.wikipedia.org/wiki/Spot_analysis

    Spot analysis, spot test analysis, or spot test is a chemical test, a simple and efficient technique where analytic assays are executed in only one, or a few drops, of a chemical solution, preferably in a great piece of filter paper, without using any sophisticated instrumentation. The development and popularization of the test is credited to ...

  4. Whiteboard animation - Wikipedia

    en.wikipedia.org/wiki/Whiteboard_animation

    Whiteboard animation. Whiteboard animation is the process of which an author physically draws and records an illustrated story using a whiteboard, or whiteboard-like surface, and marker pens. The animations frequently are aided with narration by script. The authors commonly use time-lapsed drawing and stop motion animation to liven hand-drawn ...

  5. Two-dimensional gel electrophoresis - Wikipedia

    en.wikipedia.org/wiki/Two-dimensional_gel...

    2D-Gels (Coomassie stained) Robots are used for the isolation of protein spots from 2D gels in modern laboratories. Two-dimensional gel electrophoresis, abbreviated as 2-DE or 2-D electrophoresis, is a form of gel electrophoresis commonly used to analyze proteins. Mixtures of proteins are separated by two properties in two dimensions on 2D gels ...

  6. Ray transfer matrix analysis - Wikipedia

    en.wikipedia.org/wiki/Ray_transfer_matrix_analysis

    As one example, if there is free space between the two planes, the ray transfer matrix is given by: = [], where d is the separation distance (measured along the optical axis) between the two reference planes.

  7. My System for Making Sure I Do What Matters

    images.huffingtonpost.com/2013-02-02-MySystemfor...

    My#System#for#Making#Sure#I#Do#What#Matters# #! With!all!the!devices!we!use!on!a!daily!basis,!I!still!like!to!make!my!to7do!lists!with!pen!to! paper!!!I!find!it!is ...

  8. Low-energy electron diffraction - Wikipedia

    en.wikipedia.org/wiki/Low-energy_electron...

    An electron gun from which monochromatic electrons are emitted by a cathode filament that is at a negative potential, typically 10–600 V, with respect to the sample. The electrons are accelerated and focused into a beam, typically about 0.1 to 0.5 mm wide, by a series of electrodes serving as electron lenses.

  9. Selected area diffraction - Wikipedia

    en.wikipedia.org/wiki/Selected_area_diffraction

    Selected area (electron) diffraction (abbreviated as SAD or SAED) is a crystallographic experimental technique typically performed using a transmission electron microscope (TEM). It is a specific case of electron diffraction used primarily in material science and solid state physics as one of the most common experimental techniques.

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