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2. Diffraction from slits - Wikipedia

   en.wikipedia.org/wiki/Diffraction_from_slits

   Because diffraction is the result of addition of all waves (of given wavelength) along all unobstructed paths, the usual procedure is to consider the contribution of an infinitesimally small neighborhood around a certain path (this contribution is usually called a wavelet) and then integrate over all paths (= add all wavelets) from the source to the detector (or given point on a screen).

3. Skin effect - Wikipedia

   en.wikipedia.org/wiki/Skin_effect

   Skin depth, δ, is defined as the depth where the current density is just 1/e (about 37%) of the value at the surface; it depends on the frequency of the current and the electrical and magnetic properties of the conductor. Induction cookers use stranded coils to reduce heating of the coil itself due to skin effect. The AC frequencies used in ...

4. Split-system air conditioner - Wikipedia

   en.wikipedia.org/?title=Split-system_air...

   Retrieved from "https://en.wikipedia.org/w/index.php?title=Split-system_air_conditioner&oldid=752199363"

5. Hemocytometer - Wikipedia

   en.wikipedia.org/wiki/Hemocytometer

   The gridded area of the Improved Neubauer ruled hemocytometer consists of nine 1 x 1 mm (1 mm 2) squares. These are subdivided in three directions; 0.25 x 0.25 mm (0.0625 mm 2), 0.25 x 0.20 mm (0.05 mm 2) and 0.20 x 0.20 mm (0.04 mm 2). The central square is further subdivided into 0.05 x 0.05 mm (0.0025 mm 2) squares. The raised edges of the ...

6. Near and far field - Wikipedia

   en.wikipedia.org/wiki/Near_and_far_field

   As far as acoustic wave sources are concerned, if the source has a maximum overall dimension or aperture width (D) that is large compared to the wavelength λ, the far-field region is commonly taken to exist at distances, when the Fresnel parameter is larger than 1: [3]

7. AOL Mail

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   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!