All articles starting with H
20,046 articles
High-Rise (novel)
High-Rise, J.G. Ballard's 1975 Jonathan Cape novel, follows 2,000 affluent residents of a 40-storey London tower block descending into tribal violence; final book of his urban disaster sequence, adapted by Ben Wheatley in 2015.
High-Rise Invasion
High-Rise Invasion (天空侵犯, Tenkū Shinpan) is a Japanese survival horror manga by Tsuina Miura and Takahiro Oba: 21 volumes, 258 chapters on Manga Box, sequel Arrive, and a 12-episode Zero-G Netflix anime released February 25, 2021.
High-Risk Pregnancy
A high-risk pregnancy is one in which the mother, fetus, or both face greater chances of complications during gestation or delivery, though it can still end in a healthy birth.
High-speed atomic force microscopy
High-speed atomic force microscopy (HS-AFM) is a scanning-probe technique that records nanoscale movies of biomolecules moving in liquid at video rate, first reported by Toshio Ando and colleagues in 2001.
High-speed machining
High-speed machining (HSM) is a metal-cutting practice using speeds far above conventional machining, first explored by Carl Salomon in the 1920s and applied in aerospace, automotive, and mold making.
High-speed photography
High-speed photography is an imaging technique that records fast events as ordered image sequences, at frame rates from a few hundred to hundreds of millions per second.
High-speed rail
High-speed rail, also known as HSR, is railway service at speeds of at least 250 km/h on new lines, pioneered by Japan's Tokaido Shinkansen in 1964.
High-speed rail in China
High-speed rail in China (中国高速铁路) is the world's largest high-speed network, at 48,000 km by the end of 2024, begun with the Beijing–Tianjin line in 2008.
High-speed rail in Europe
High-speed rail in Europe is a network of specially built and upgraded lines, concentrated in Spain, France, Italy, and Germany, with trains running above 250 km/h on new lines.
High-speed rail in India
High-speed rail in India: the 508 km Mumbai–Ahmedabad Shinkansen-technology corridor (350 kmph design, ₹1.08 lakh crore, 81% JICA-funded, first service expected August 2027) plus the Vande Bharat semi-high-speed programme and seven planned corridors.
High-speed rail in Indonesia
High-speed rail in Indonesia consists of the Whoosh line linking Jakarta and Bandung, opened in 2023 as Southeast Asia's first high-speed railway, reaching 350 km/h.
High-speed rail in Morocco
High-speed rail in Morocco consists of the Al Boraq service, Africa's first and only high-speed line, running since 2018 between Tangier and Casablanca, operated by ONCF.
High-speed rail in the United Kingdom
High-speed rail in the UK consists of High Speed 1, a line from London St Pancras to the Channel Tunnel, and High Speed 2, under construction to Birmingham.
High-speed rail in the United States
High-speed rail in the United States is passenger rail expected to sustain speeds above 125 mph, now limited to Amtrak's Northeast Corridor with lines under construction in California and Nevada.
High-speed steel
High-speed steel (HSS) is a high-carbon, high-alloy tool steel, alloyed with tungsten, molybdenum, chromium, and vanadium, which keeps its cutting hardness at approximately 600 °C and is used mostly for machining tools.
High-speed videoendoscopy
High-speed videoendoscopy (HSV) is a laryngeal imaging method that records vocal fold vibration at thousands of frames per second, used in voice assessment and research.
High-STEACS trial
High-STEACS (NCT01852123) was a Scottish stepped-wedge cluster-randomized trial of high-sensitivity troponin I with sex-specific 99th centile thresholds in 48,282 patients; it reclassified many women but did not reduce 1-year MI or cardiac death.
High-strength pipeline steel
High-strength pipeline steel is line pipe steel of grade X80 and above in the API 5L system, used for large-diameter, high-pressure oil and gas pipelines.
High-tech architecture
High-tech architecture, also known as Structural Expressionism, is a style that emerged in 1970s Britain and celebrates technology by exposing a building's structure and mechanical services on its exterior.
High-temperature co-electrolysis of steam and CO2
High-temperature co-electrolysis of steam and CO2 is a process in which a solid oxide electrolyzer cell at 650–900 °C turns renewable electricity, water, and CO2 into synthesis gas.
High-temperature gas-cooled reactor
A high-temperature gas-cooled reactor (HTGR) is a graphite-moderated, helium-cooled nuclear reactor with ceramic-coated TRISO fuel, reaching coolant temperatures of 700–950 °C; China's HTR-PM became the first commercial-scale plant in 2023.
High-temperature phase-change materials
High-temperature phase-change materials are substances that store thermal energy as latent heat while melting and solidifying above about 300 °C, for use in concentrated solar power and industrial waste-heat recovery.
High-temperature steam electrolysis
High-temperature steam electrolysis (HTSE) splits steam into hydrogen and oxygen using solid oxide electrolysis cells at 500–1000 °C, needing roughly 35% less electricity than conventional low-temperature electrolysis.
High-temperature superconducting magnet
A high-temperature superconducting magnet is an electromagnet wound from REBCO tape or Bi-2212 wire that stays superconducting at far warmer temperatures, enabling fields above 20 T and compact fusion tokamaks.
High-temperature superconductivity
High-temperature superconductivity is superconductivity above roughly 30 K, begun by Bednorz and Müller's 1986 discovery in a copper oxide ceramic, honored with the 1987 Nobel Prize in Physics.
High-temperature superconductivity in pressurized La3Ni2O7
High-temperature superconductivity in pressurized La3Ni2O7 is a superconducting state with transition temperatures near 80 K in the bilayer nickelate La3Ni2O7 above 14 GPa, reported in 2023.
High-test peroxide
High-test peroxide (HTP), or high-test hydrogen peroxide, is concentrated hydrogen peroxide in water used as a rocket propellant, monopropellant, and storable oxidizer, in grades up to 98%.
High-throughput diffusion multiples
A high-throughput diffusion multiple is an assembly of three or more metal blocks annealed together so diffusion creates a composition-gradient materials library for rapid phase diagram mapping.
High-throughput electrocatalyst screening
High-throughput electrocatalyst screening is the rapid, systematic evaluation of many candidate electrocatalyst materials in parallel to identify compositions with high activity and stability for reactions like hydrogen evolution and carbon dioxide reduction.
High-throughput electrocatalyst screening by thin-film sputtering
High-throughput electrocatalyst screening by thin-film sputtering is a materials-discovery method in which sputtered thin-film libraries on one substrate are screened to find catalysts for reactions like hydrogen and oxygen evolution.