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2. 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 ...

3. Sumatra PDF - Wikipedia

   en.wikipedia.org/wiki/Sumatra_PDF

   Sumatra PDF is a free and open-source document viewer that supports many document formats including: Portable Document Format (PDF), Microsoft Compiled HTML Help (CHM), DjVu, EPUB, FictionBook (FB2), MOBI, PRC, Open XML Paper Specification (OpenXPS, OXPS, XPS), and Comic Book Archive file (CB7, CBR, CBT, CBZ). [3]

4. Welch's method - Wikipedia

   en.wikipedia.org/wiki/Welch's_method

   Welch's method, named after Peter D. Welch, is an approach for spectral density estimation.It is used in physics, engineering, and applied mathematics for estimating the power of a signal at different frequencies.

5. PrimoPDF - Wikipedia

   en.wikipedia.org/wiki/PrimoPDF

   Can append output to an existing PDF file. Supports strong password-based PDF security. Allows PDF metadata—including author, title, subject, and keywords—to be set. Create files for PDF version 1.2, 1.3, 1.4, or 1.5; The software uses OpenCandy (which includes spyware) to deliver advertisements.

6. PDFtk - Wikipedia

   en.wikipedia.org/wiki/Pdftk

   PDFtk (short for PDF Toolkit) is a toolkit for manipulating Portable Document Format (PDF) documents. [3] [4] It runs on Linux, Windows and macOS. [5] It comes in three versions: PDFtk Server (open-source command-line tool), PDFtk Free and PDFtk Pro (proprietary paid). [2] It is able to concatenate, shuffle, split and rotate PDF files.

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 ...