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An open textbook is a textbook licensed under an open license, and made available online to be freely used by students, teachers and members of the public.Many open textbooks are distributed in either print, e-book, or audio formats that may be downloaded or purchased at little or no cost.
Platinum is a chemical element; it has symbol Pt and atomic number 78. It is a dense, malleable, ductile, highly unreactive, precious, silverish-white transition metal. Its name originates from Spanish platina, a diminutive of plata "silver". [7] [8] Platinum is a member of the platinum group of elements and group 10 of the periodic table of ...
In August 2003, Project Gutenberg created a CD containing approximately 600 of the "best" e-books from the collection. The CD is available for download as an ISO image. When users are unable to download the CD, they can request to have a copy sent to them, free of charge. In December 2003, a DVD was created containing nearly 10,000 items. At ...
This is the ECMA release of the ISO 9660:1988 standard, available as a free download "Summary of the ISO 9660 Specifications". Archived from the original on 27 May 2022. "Description of data structures in ISO-9660". Archived from the original on 17 July 2011. "ISO 9660 Analyzer Tool (iat)". Freecode. "RRIP History: About Young Minds, Inc".
The Rainbow Books are a collection of CD format specifications, generally written and published by the companies involved in their development, including Philips, Sony, Matsushita and JVC, among others. A number of these specifications have been officially adopted by established standards bodies, including the ISO, IEC, and ECMA.
Other precious metals include the platinum group metals: ruthenium, rhodium, palladium, osmium, iridium, and platinum, of which platinum is the most widely traded. [1] The demand for precious metals is driven not only by their practical use but also by their role as investments and a store of value. Historically, precious metals have commanded ...
Naturally occurring platinum (78 Pt) consists of five stable isotopes (192 Pt, 194 Pt, 195 Pt, 196 Pt, 198 Pt) and one very long-lived (half-life 4.83×10 11 years) radioisotope (190 Pt). There are also 34 known synthetic radioisotopes , the longest-lived of which is 193 Pt with a half-life of 50 years.
Digital textbooks are a major component of technology-based education reform. They may serve as the texts for a traditional face-to-face class, an online course or degree, or massive open online courses (MOOCs). As with physical textbooks, digital textbooks can be either rented for a term or purchased for lifetime access.