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2. Comparison of graphics file formats - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_graphics...

   PDF: Portable Document Format Adobe Systems.pdf, .epdf application/pdf PEF: PENTAX RAW PENTAX TIFF .pef PGF: Progressive Graphics File xeraina GmbH .pgf Photographic images, eventual replacement for JPEG. Yes PGM: Portable Graymap File Format ASCII.pgm image/x-portable-graymap Yes PGML: Precision Graphics Markup Language Adobe Systems, IBM,

3. Spectral density - Wikipedia

   en.wikipedia.org/wiki/Spectral_density

   More commonly used is the power spectral density (PSD, or simply power spectrum), which applies to signals existing over all time, or over a time period large enough (especially in relation to the duration of a measurement) that it could as well have been over an infinite time interval. The PSD then refers to the spectral energy distribution ...

4. Welch's method - Wikipedia

   en.wikipedia.org/wiki/Welch's_method

   Welch's method is an improvement on the standard periodogram spectrum estimating method and on Bartlett's method, in that it reduces noise in the estimated power spectra in exchange for reducing the frequency resolution. Due to the noise caused by imperfect and finite data, the noise reduction from Welch's method is often desired.

5. Payment Services Directive - Wikipedia

   en.wikipedia.org/wiki/Payment_Services_Directive

   The PSD contained two main sections: The "market rules" described which type of organisations could provide payment services. Next to credit institutions (i.e. banks) and certain authorities (e.g. central banks, government bodies), the PSD mentioned electronic money institutions (EMI), created by the E-Money Directive in 2000, and created the new category of "payment institutions" (PI) with ...

6. Sumatra PDF - Wikipedia

   en.wikipedia.org/wiki/Sumatra_PDF

   The Sumatra PDF Viewer is a tiny open source portable reader that opens PDF's in the blink of an eye. Bloat and startup time is a major drawback to Adobe Reader, so we fled to the faster arms of Foxit Reader long ago. However, at 850KB, Sumatra is way slimmer than FoxIt. ^ Anders Ingeman Rasmussen (2008).

7. Position sensitive device - Wikipedia

   en.wikipedia.org/wiki/Position_sensitive_device

   2-D tetra-lateral position sensitive device (PSD) A 2-D tetra-lateral PSD is capable of providing continuous position measurement of the incident light spot in 2-D. It consists of a single square PIN diode with a resistive layer. When there is an incident light on the active area of the sensor, photocurrents are generated and collected from ...