61,984 articles
High frequency
High frequency (HF), also known as shortwave, is the radio band from 3 to 30 MHz, used for long-distance links via ionospheric reflection by amateur, maritime, aviation, and government users.
High Gothic
High Gothic is the mature phase of Gothic architecture, roughly 1194 to the late 13th century, whose canonical monuments are the French cathedrals of Chartres, Reims, and Amiens.
High Island Offshore Gas Pipeline System
The High Island Offshore Gas Pipeline System is a natural gas pipeline network in the Gulf of Mexico that has carried offshore Texas and Louisiana gas to shore since 1978.
High Island Reservoir (万宜水库)
High Island Reservoir (万宜水库) is Hong Kong's largest impounding reservoir, holding 281 million cubic meters of water and formed by damming the Kwun Mun Channel in Sai Kung; its East Dam is a celebrated geological site.
High Level Bridge, River Tyne
The High Level Bridge is a road and railway bridge over the River Tyne between Newcastle and Gateshead, opened in 1849 and designed by Robert Stephenson.
High NA EUV
High NA EUV is the second generation of EUV lithography, raising the numerical aperture from 0.33 to 0.55; ASML's TWINSCAN EXE scanners entered chip production at Intel in 2026.
High Noon (seltzer)
High Noon, also known as High Noon Spirits, is an American vodka- and tequila-based hard seltzer brand owned by Gallo, launched in 2019.
High River power station
High River power station (潞安长子高河低热值煤电厂) is a 1,320 MW coal-fired power station in Changzhi, Shanxi, China, with two 660 MW ultra-supercritical units burning low-calorific-value waste coal since 2021.
High Roller (Ferris wheel)
The High Roller is a 550-foot-tall observation wheel at The LINQ on the Las Vegas Strip, opened in 2014 as the world's tallest until 2021.
High Speed 1
High Speed 1 (HS1), officially the Channel Tunnel Rail Link, is the UK's first high-speed railway, linking London St Pancras to the Channel Tunnel, completed in 2007.
High Speed 2
High Speed 2 (HS2) is a high-speed railway being built in Great Britain from London Euston to the West Midlands, with a branch to Birmingham Curzon Street.
High Speed Packet Access
High Speed Packet Access (HSPA) combines HSDPA on the downlink and HSUPA on the uplink in 3GPP Releases 5 and 6, widely marketed as 3.5G.
High Sulphur Fuel Oil
High Sulphur Fuel Oil (HSFO) is a residual marine fuel with up to 3.5% sulfur, the dominant bunker fuel for ships until the IMO 2020 sulfur cap.
High tech
High tech, also called high technology, describes industries and products distinguished by high technological intensity, usually measured by research and development spending relative to output.
High thermal conductivity polymers
High thermal conductivity polymers are polymers, either intrinsically conductive or composites with conductive fillers, that transport heat far better than ordinary plastics and serve heat dissipation in electronics.
High-altitude military parachuting
High-altitude military parachuting, also called HALO or HAHO, inserts personnel by free-fall parachute from up to 35,000 feet; in HAHO the jumper glides tens of miles under canopy.
High-assay low-enriched uranium
High-assay low-enriched uranium (HALEU) is uranium enriched to between 5 and 20 percent uranium-235, above today's reactor fuel; most U.S. advanced reactors are built around it.
High-bay warehouse
A high-bay warehouse is a very large warehouse with storage heights of about 12 to 50 meters, designed for high density and usually automated retrieval by stacker cranes.
High-burnup fuel
High-burnup fuel is nuclear reactor fuel discharged at a burnup of 45 GWd/MTU or more, a level the US Nuclear Regulatory Commission treats as high, pursued mainly for economic reasons.
High-concentration electrolytes
High-concentration electrolytes (HCEs) are battery electrolytes with salt levels typically 3 to 5 M, where anions enter the cation's solvation shell and change interphase chemistry.
High-damping rubber bearing
A high-damping rubber bearing is a seismic isolation device made of rubber and steel layers, with the rubber formulated to dissipate earthquake energy without separate dampers.
High-definition map
A high-definition map is a centimeter-accurate digital representation of the road environment, recording lane geometry, markings, and traffic signals, serving as prior knowledge for automated vehicle localization, perception, and path planning.
High-definition television
High-definition television, or HDTV, is a digital television system with about twice the resolution of conventional television and a 16:9 widescreen picture, first broadcast regularly by Japan's NHK via satellite in 1989.
High-definition video
High-definition video, or HD video, is video with roughly twice the resolution of standard-definition television, chiefly in 1280 × 720 and 1920 × 1080 formats with a 16:9 aspect ratio.
High-electron-mobility transistor
The high-electron-mobility transistor (HEMT), or MODFET, is a field-effect transistor whose channel is a high-mobility two-dimensional electron gas at a semiconductor heterointerface, first demonstrated at Fujitsu in 1980.
High-energy ball milling
High-energy ball milling (HEBM) is a solid-state powder processing method in which milling balls repeatedly fracture, deform, and cold-weld powder particles, producing fine or alloyed powders without melting.
High-entropy alloy
A high-entropy alloy (HEA) is a metallic alloy mixing five or more principal elements in roughly equal shares, a field founded by independent 2004 papers from Jien-Wei Yeh and Brian Cantor.
High-entropy alloy coatings
High-entropy alloy coatings are protective metallic or ceramic layers made from alloys of at least five principal elements in near-equal proportions, applied to cheaper substrates for wear, corrosion, and oxidation resistance.
High-entropy alloy electrocatalysts
High-entropy alloy electrocatalysts are multicomponent metal catalysts, typically five or more elements in near-equiatomic proportions, that accelerate reactions such as hydrogen evolution, oxygen evolution, and oxygen reduction.
High-entropy cathode
A high-entropy cathode is a battery positive-electrode material in which five or more elements share active cation sites in near-equiatomic proportions, stabilized by high configurational entropy.