5,208 articles
Aerial triangulation
Aerial triangulation, also called aerotriangulation, is a photogrammetric process that orients all images in an overlapping aerial block simultaneously against limited ground control, using bundle block adjustment.
Aerobic digestion
Aerobic digestion is a sludge stabilization method in which microorganisms decompose organic solids with oxygen supplied by aeration, valued at small and medium treatment works for simple operation.
Afghanistan–Uzbekistan Friendship Bridge
The Afghanistan–Uzbekistan Friendship Bridge is a road and rail bridge across the Amu Darya linking Termez with Hairatan, built by the Soviet Union and opened in 1982.
Aflaj Irrigation Systems of Oman
The Aflaj Irrigation Systems of Oman are five still functioning gravity-fed falaj irrigation channels in northern Oman, inscribed on the UNESCO World Heritage List in 2006 to represent the country's more than 3,000 aflaj.
Afsluitdijk
The Afsluitdijk, or Enclosure Dike, is a 32 km dam in the Netherlands separating the Wadden Sea from the IJsselmeer, built between 1927 and 1932.
Aftermath of the Gotthard Road Tunnel fire
The aftermath of the 2001 Gotthard Road Tunnel fire covers the official investigation into the disaster, the tunnel's two-month closure and repair, and the safety reforms that followed.
Aftermath of the Mont Blanc Tunnel fire
The Mont Blanc Tunnel fire aftermath documents the 1999 tragedy, which prompted a three-year closure, criminal convictions, and the creation of the EU Directive on tunnel safety.
Aga Khan Palace
The Aga Khan Palace, built in Pune in 1892, is a Gandhi memorial where Mahatma Gandhi and associates were imprisoned by the British from 1942 to 1944.
Agadez Grand Mosque
The Agadez Grand Mosque (Grande Mosquée d'Agadez) is the Friday mosque of Agadez, Niger, built of mudbrick with a 27-meter minaret, the tallest ever made entirely of mudbrick.
Agra Fort
Agra Fort, also called the Red Fort of Agra or Lal Qila, is a 16th-century Mughal fortress in Agra, India, rebuilt in red sandstone by Akbar from 1565.
Agua Negra Pass
Agua Negra Pass (Paso de Agua Negra) is a 4,780-meter Andean pass linking San Juan Province, Argentina, with Chile's Coquimbo Region, the highest Argentina–Chile border crossing.
Aguas Andinas
Aguas Andinas is a Chilean publicly traded water utility that produces, distributes, and treats water for the Metropolitan Region of Santiago, serving about 8.5 million people.
Aguas de Barcelona
Aguas de Barcelona, known as Agbar, is a Spanish water group founded in 1867 whose operating company supplies drinking water to 23 Barcelona-area municipalities, serving about 3 million people.
Águas de Portugal
Águas de Portugal (AdP) is the Portuguese state-owned holding company that develops and operates the country's bulk water supply and wastewater systems, created in 1993.
Ahmad Khalid Abdelrazaq
Ahmad Khalid Abdelrazaq is an American structural engineer who was chief technical director for the Burj Khalifa and was elected to the National Academy of Engineering in 2022.
Ahwahnee Hotel
The Ahwahnee is a grand hotel in Yosemite Valley, California, opened in 1927 and known for its rustic and art deco architecture as a National Historic Landmark.
AIA contract documents
AIA contract documents are standardized agreements and forms for the design and construction industry, published by the American Institute of Architects since 1888 and organized into numbered series by project delivery method.
AIA Gold Medal
The AIA Gold Medal is the highest annual honor given by the American Institute of Architects for a body of work with lasting influence on architecture.
Ain Diwar
Ain Diwar (عين ديوار), the Ain Diwar Bridge, a ruined Zangid stone bridge of 1146–1164 in far northeastern Syria, long mislabeled Roman; one pointed arch with zodiac carvings survives beside the shifted Tigris.
Aine M. Brazil
Aine M. Brazil is an Irish-born structural engineer and Vice Chairman of Thornton Tomasetti who led the design of Hudson Yards and Times Square towers, elected to the National Academy of Engineering in 2018.
Air changes per hour
Air changes per hour (ACH), also called the air change rate, measures how many times a room's total air volume is replaced each hour, calculated as hourly airflow divided by room volume.
Air gap (plumbing)
An air gap in plumbing is the open vertical space between a water outlet and a fixture's flood rim, which prevents backflow of contaminated water.
Air-entraining admixture
An air-entraining admixture is a surfactant-based chemical added to concrete during mixing to stabilize microscopic air bubbles that protect hardened concrete against freeze-thaw damage; air-entrained concrete is standard in freezing climates.
Airavatesvara Temple
The Airavatesvara Temple is a 12th-century Hindu temple dedicated to Shiva at Darasuram, Tamil Nadu, built by Chola king Rajaraja II and part of the UNESCO Great Living Chola Temples.
Airport
An airport is an area of land or water used for the landing and takeoff of aircraft, together with its buildings and facilities such as runways and terminals.
Airport Link, Brisbane
Airport Link, branded AirportlinkM7, is a 6.7 km twin-tunnel toll road in Brisbane's northern suburbs connecting the Inner City Bypass to Brisbane Airport, opened in July 2012.
AISC Steel Construction Manual
The AISC Steel Construction Manual is the American Institute of Steel Construction's reference book for the design, fabrication, and erection of structural steel buildings and bridges, first published in 1927.
Ajka alumina plant accident
The Ajka alumina plant accident was a dam failure at an alumina refinery in Ajka, Hungary, on 4 October 2010, whose red sludge flood killed ten people.
Ajyad Fortress (قلعة أجياد)
Ajyad Fortress (قلعة أجياد) was an Ottoman-era fortress built in 1780 on Bulbul Hill above the Grand Mosque of Mecca and demolished in January 2002.
Akal Takht (ਅਕਾਲ ਤਖ਼ਤ)
The Akal Takht (ਅਕਾਲ ਤਖ਼ਤ, Akal Takht Sahib) is the supreme seat of Sikh authority, founded by Guru Hargobind in 1606 in the Golden Temple complex at Amritsar.