A solar tracker is a device that orients a payload toward the Sun. Payloads are usually solar panels, parabolic troughs, Fresnel reflectors, lenses, or the mirrors of a heliostat.

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Gautrain is an 80-kilometre (50-mile) higher-speed express commuter rail system in Gauteng, South Africa, which links Johannesburg, Pretoria, Kempton Park and O. R. Tambo International Airport. It takes 15 minutes to travel from Sandton to O. R. Tambo International Airport on the Gautrain and 35 minutes from Pretoria…

Building insulation materials are the building materials that form the thermal envelope of a building or otherwise reduce heat transfer. Insulation may be categorized by its composition (natural or synthetic materials), form (batts, blankets, loose-fill, spray foam, and panels), structural contribution (insulating…

e-toll (in South Africa) consisted of the electronic toll collection (ETC) processes employed by South Africa's roads agency SANRAL on selected toll roads or toll lanes in the Gauteng province, subject to the Sanral Act of 1998. SANRAL derives its income both from toll income and the national fiscus, while initial…

The 1979 oil crisis, sometimes referred to as the second oil crisis (in reference to the 1973 oil crisis), refers to the drop in oil production in the aftermath of the Iranian Revolution that led to an energy crisis in 1979. Although the global oil supply only decreased by approximately four percent, the oil markets'…

Johannesburg ( joh-HAN-iss-burg, US also -⁠HAHN-, Afrikaans: [jʊəˈɦanəsbœrχ] ; Xhosa: eGoli [ɛˈɡɔːli]; Zulu: iGoli [îˈɡóːli]), colloquially known as Jozi, Joburg, or "the City of Gold", is the capital city of the province of Gauteng and the largest city in South Africa. In 2022 (the year of the most recent census),…

Radiant heating and cooling is a category of HVAC technologies that exchange heat by both convection and radiation with the environments they are designed to heat or cool. There are many subcategories of radiant heating and cooling, including: "radiant ceiling panels", "embedded surface systems", "thermally active…

A liquid-crystal display (LCD) is a flat-panel display or other electronically modulated optical device that uses the light-modulating properties of liquid crystals combined with polarizers to display information. Liquid crystals do not emit light directly but instead use a backlight or reflector to produce images in…