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The word mathematics comes from the Ancient Greek word máthēma (μάθημα), meaning ' something learned, knowledge, mathematics ', and the derived expression mathēmatikḗ tékhnē (μαθηματικὴ τέχνη), meaning ' mathematical science '. It entered the English language during the Late Middle English period through French and ...
To resolve this problem, an alternative series of buffers based on artificial seawater was developed. [31] This new series resolves the problem of ionic strength differences between samples and the buffers, and the new pH scale is referred to as the total scale, often denoted as pH T. The total scale was defined using a medium containing ...
Indian mathematicians were aware of negative numbers by the 7th century, [170] and their role in mathematical problems of debt was understood. [171] Mostly consistent and correct rules for working with negative numbers were formulated, [ 172 ] and the diffusion of these rules led the Arab intermediaries to pass it on to Europe., [ 171 ] for ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 12 January 2025. This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these messages) This article may need to be rewritten to comply with Wikipedia's quality standards. You can help. The talk page may contain suggestions ...
DNA profiling was developed in 1984 by British geneticist Sir Alec Jeffreys, [166] and first used in forensic science to convict Colin Pitchfork in the 1988 Enderby murders case. [167] The development of forensic science and the ability to now obtain genetic matching on minute samples of blood, skin, saliva, or hair has led to re-examining many ...
The earliest documented use of the word Arab in reference to a people appears in the Kurkh Monoliths, an Akkadian-language record of the Assyrian conquest of Aram (9th century BCE). The Monoliths used the term to refer to Bedouins of the Arabian Peninsula under King Gindibu , who fought as part of a coalition opposed to Assyria .
The simplest inlet to a centrifugal compressor is typically a simple pipe. Depending upon its use/application inlets can be very complex. They may include other components such as an inlet throttle valve, a shrouded port, an annular duct (see Figure 1.1), a bifurcated duct, stationary guide vanes/airfoils used to straight or swirl flow (see Figure 1.1), movable guide vanes (used to vary pre ...
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