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Windowed envelope. US Patent 701,839 for a windowed envelope. Modern envelope with a single window for the recipient address. A windowed envelope is a conventional envelope with a transparent (typically PET or BOPS Bi-oriented polystyrene [1] plastic film) window to allow the recipient's address to be printed on the paper contained within.
The Overton window is an approach to identifying the ideas that define the spectrum of acceptability of governmental policies. It says politicians can act only within the acceptable range. Shifting the Overton window involves proponents of policies outside the window persuading the public to expand the window. Proponents of current policies, or ...
In signal processing and statistics, a window function (also known as an apodization function or tapering function[ 1]) is a mathematical function that is zero-valued outside of some chosen interval. Typically, window functions are symmetric around the middle of the interval, approach a maximum in the middle, and taper away from the middle.
An envelope is a common packaging item, usually made of thin, flat material. It is designed to contain a flat object, such as a letter or card. Traditional envelopes are made from sheets of paper cut to one of three shapes: a rhombus, a short-arm cross or a kite. These shapes allow the envelope structure to be made by folding the sheet sides ...
Glassine. Printed glassine envelope for the photographer Arthur Weston, c. 1900. Glassine envelope. Glassine is a smooth and glossy paper that is air-, water-, and grease-resistant. It is usually available in densities between 50–90 g/m 2 (0.010–0.018 lb/sq ft). It is translucent unless dyes are added to color it or make it opaque.
The building envelope or enclosure is all of the elements of the outer shell that maintain a dry, heated, or cooled indoor environment and facilitate its climate control. Building envelope design is a specialized area of architectural and engineering practice that draws from all areas of building science and indoor climate control. [ 2]
Analytic signal. In mathematics and signal processing, an analytic signal is a complex-valued function that has no negative frequency components. [1] The real and imaginary parts of an analytic signal are real-valued functions related to each other by the Hilbert transform . The analytic representation of a real-valued function is an analytic ...
Morlet wavelet. In mathematics, the Morlet wavelet (or Gabor wavelet) [ 1] is a wavelet composed of a complex exponential ( carrier) multiplied by a Gaussian window (envelope). This wavelet is closely related to human perception, both hearing [ 2] and vision. [ 3]
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