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7-20-8

(1907), a “comedy of to‐day” by Augustin Daly. [Daly's Theatre, 49 perf.] Portrait of a Lady, picture #728 at the annual Academy exhibition, so lovingly depicts a beautiful woman ...

aircrete

aircrete   Quick reference

A Dictionary of Construction, Surveying and Civil Engineering (2 ed.)

Reference type:
Subject Reference
Current Version:
2020

...categorized as low, medium, and high density as depicted in the table below. Classification and Physical Properties of Aircrete Blocks Aircrete density Compressive strength (N/mm 2 ) Density (kg/m 3 ) Thermal conductivity (W/mK) Low 2.0 – 3.5 450 0.09 – 0.11 Medium 4.0 – 4.5 620 0.15 – 0.17 High 7.0 – 8.5 750 0.19 – 0.20 http://www.aircrete.co.uk Home page of the Aircrete Products Association, providing information regarding aircrete technology, its applications, and advantages....

electrical conductivity

electrical conductivity   Quick reference

A Dictionary of Mechanical Engineering (2 ed.)

Reference type:
Subject Reference
Current Version:
2019

...current flows through a material. It is the inverse of electrical resistivity. A very wide range of values of σ ‎ are exhibited by conductors, semi-conductors, and insulators. Most metals are good conductors at room temperature, with σ ‎ ranging from 0.2 × 10 7 / Ω ‎.m for stainless steel to 6.8 × 10 7 / Ω ‎.m for silver. The charge carriers are electrons. Conductivity decreases with increasing temperature and for alloys is dependent on composition. Intrinsic semiconductors such as pure silicon (Si) and gallium arsenide (GaAs) have low σ ‎ values of 4 ×...

Technology

Technology: c. 27,000 years ago - 2011  

Reference type:
Timeline
Current Version:
2012

...(1410m) Humber World Encyclopedia 1 1980s 20th century Engineering Great Britain - from 1707 United Kingdom - from 1801 British Isles Europe Britain 1981 1981 The IBM PC 5150, the first Personal Computer, is launched with a chip by Intel and software by Microsoft Microsoft A Dictionary of Computing 6 1980s 20th century Inventions and discoveries North America United States 1983 1983 The first all-digital synthesizer, the DX7, is put on the market by Yamaha synthesizer The Oxford Companion to Music 1 rev 1980s 20th century Commerce and industry Inventions and...

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