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2. Pulse-position modulation - Wikipedia

   en.wikipedia.org/wiki/Pulse-position_modulation

   v. t. e. Pulse-position modulation (PPM) is a form of signal modulation in which M message bits are encoded by transmitting a single pulse in one of possible required time shifts. [1][2] This is repeated every T seconds, such that the transmitted bit rate is bits per second. It is primarily useful for optical communications systems, which tend ...

3. Parts-per notation - Wikipedia

   en.wikipedia.org/wiki/Parts-per_notation

   In science and engineering, the parts-per notation is a set of pseudo-units to describe small values of miscellaneous dimensionless quantities, e.g. mole fraction or mass fraction. Since these fractions are quantity-per-quantity measures, they are pure numbers with no associated units of measurement. Commonly used are parts-per-million (ppm, 10 ...

4. PDF Split and Merge - Wikipedia

   en.wikipedia.org/wiki/PDF_Split_and_Merge

   Website. pdfsam.org. PDFsam Basic or PDF Split and Merge is a free and open-source cross-platform desktop application to split, merge, extract pages, rotate and mix PDF documents. PDFsam uses a freemium model and encourages buying the full version with popups.

5. List of PDF software - Wikipedia

   en.wikipedia.org/wiki/List_of_PDF_software

   deskUNPDF: PDF converter to convert PDFs to Word (.doc, docx), Excel (.xls), (.csv), (.txt), more; GSview: File:Convert menu item converts any sequence of PDF pages to a sequence of images in many formats from bit to tiffpack with resolutions from 72 to 204 × 98 (open source software) Google Chrome: convert HTML to PDF using Print > Save as PDF.

6. Mass fraction (chemistry) - Wikipedia

   en.wikipedia.org/wiki/Mass_fraction_(chemistry)

   Mass fraction (chemistry) In chemistry, the mass fraction of a substance within a mixture is the ratio (alternatively denoted ) of the mass of that substance to the total mass of the mixture. [1] Expressed as a formula, the mass fraction is: Because the individual masses of the ingredients of a mixture sum to , their mass fractions sum to unity:

7. Soda PDF - Wikipedia

   en.wikipedia.org/wiki/Soda_PDF

   Soda View/3D is a free PDF application users can use to open, view, and create PDF files. The flipping animation tool of its patent-pending 3D feature enables users to go through pages of PDF files. [6] CNET has praised the 3D Reader as being “clean and inviting,” [7] However, the program also installs unwanted software that creates ...