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A time–distance diagram is a chart with two axes: one for time, the other for location. The units on either axis depend on the type of project: time can be expressed in minutes (for overnight construction of railroad modification projects such as the installation of switches) or years (for large construction projects); the location can be (kilo)meters, or other distinct units (such as ...
Rates of travel in America, 1800 to 1930. [7] plate 138, page 366) Francis Galton's first known isochronic map published for the Proceedings of the Royal Geographical Society, 1881. It shows the travel times in 1881 from London, United Kingdom to different parts of the world in days. It assumes that there are favourable travel conditions and ...
Other US government agencies may include CDRLs in contracts, but these will not use the military's DD Form 1423. Most data items are developed and delivered in compliance with pre-defined data item descriptions (DID). These pre-defined data items may be tailored by deleting any part of a DID that is not applicable to the specific acquisition. [2]
The figures below are simplex data rates, which may conflict with the duplex rates vendors sometimes use in promotional materials. Where two values are listed, the first value is the downstream rate and the second value is the upstream rate. The use of decimal prefixes is standard in data communications.
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The US Navy has used several decompression models from which their published decompression tables and authorized diving computer algorithms have been derived. The original C&R tables used a classic multiple independent parallel compartment model based on the work of J.S.Haldane in England in the early 20th century, using a critical ratio exponential ingassing and outgassing model.
The first three rows in the table below reproduce the headings and first two data rows of the left-side 19 degree page of Napier's table, see photograph. They are followed by values computed using modern algorithms for the same angles. [6] These are truncated to 8-digit accuracy, one more than the nominal 7-digit accuracy of Napier's table.
Title page of John Napier's Mirifici Logarithmorum Canonis Descriptio from 1614, the first published table of logarithms A page from Napier's Mirifici logarithmorum tables, with trigonometric and log trig data for 34 degrees. The history of logarithms is the story of a correspondence (in modern terms, a group isomorphism) between multiplication ...