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Hydrostatic drive
A hydrostatic drive, or hydrostatic transmission, converts engine rotation into hydraulic pressure at a pump and back into rotation at a motor, giving stepless speed control without gears.
Hydrostatic stress
Hydrostatic stress is the average of the three normal stress components at a point in a material, equal to the pressure a fluid at rest experiences, and it drives volume change.
Hydrostatic test (pipelines)
A hydrostatic test of a pipeline fills a segment with water and pressurizes it above its maximum operating pressure to prove the pipe and welds will not leak or rupture.
Hydrotalcite catalyst
Hydrotalcite catalyst is a layered magnesium–aluminum hydroxide (layered double hydroxide) used as a reusable heterogeneous solid base catalyst, above all for transesterifying vegetable oils and waste fats into biodiesel.
Hydrothermal gasification
Hydrothermal gasification is a thermochemical conversion method that reacts wet biomass or organic waste in hot, pressurized water to produce gas rich in hydrogen or methane, with pilot plants only.
Hydrothermal liquefaction of plastics
Hydrothermal liquefaction of plastics (plastic HTL) is a thermochemical recycling process that decomposes waste polymers in hot, pressurized water into an oil refined into fuels and chemicals.
Hydrotreated vegetable oil
Hydrotreated vegetable oil (HVO), also known as renewable diesel or green diesel, is a liquid biofuel made by hydrogenating vegetable oils and waste fats, usable in diesel engines without modification.
Hydrovolt
Hydrovolt is a Norwegian battery recycling company founded in 2020 as a joint venture of Hydro and Northvolt, operating Europe's largest EV battery recycling plant in Fredrikstad.
Hyena
Hyena is a subquadratic, attention-free neural network architecture for sequence modeling, introduced in 2023 by Stanford's Hazy Research group, whose long convolutions run in O(N log N) time and seeded the genomic model HyenaDNA.
Hyeon Suk Shin
Hyeon Suk Shin (신현석) is a South Korean materials chemist known for ultralow-dielectric amorphous boron nitride and single-crystal hexagonal boron nitride, and director of the IBS Center for 2D Quantum Heterostructures since 2024.
Hyesung Park
Hyesung Park (박혜성) is a South Korean energy materials researcher known for graphene transparent electrodes and perovskite solar cells, a professor at Korea University since 2023.
Hygon Information Technology (海光信息技术股份有限公司)
Hygon Information Technology (海光) is a Chinese fabless semiconductor company founded in Tianjin in 2014 from a 2016 AMD licensing agreement, now a principal domestic supplier of x86 server CPUs and AI accelerators.
Hyla Napadensky
Hyla Napadensky was an engineer at IIT Research Institute who studied the sensitivity of explosives and solid rocket propellants to detonation under low-velocity impact, and was elected to the National Academy of Engineering.
Hyliion Holdings
Hyliion Holdings is a Texas-based power technology company founded by Thomas Healy in 2015 that builds the KARNO Power Module, a fuel-agnostic linear generator running on more than 20 fuels.
HyNet (North West England)
HyNet North West is an industrial decarbonisation project in North West England and North Wales that captures and stores industrial CO2 and produces low carbon hydrogen, selected in 2021 as a UK CCUS cluster.
Hyodol
Hyodol (효돌) is a doll-shaped socially assistive robot for older adults made by South Korean company Hyodol Co., Ltd., providing companionship, reminders, and caregiver alerts.
Hyongsok Tom Soh
Hyongsok Tom Soh, known professionally as H. Tom Soh, is an electrical engineer and bioengineer, a Stanford professor since 2015 known for continuous in-vivo biosensors and directed evolution of aptamers.
Hyosung (motorcycle manufacturer)
Hyosung is a South Korean motorcycle manufacturer founded in 1978 and based in Changwon, known for GT-series sportbikes and GV-series cruisers powered by its own 647 cc V-twin.
Hyper Text Coffee Pot Control Protocol
The Hyper Text Coffee Pot Control Protocol (HTCPCP) is a facetious protocol for controlling coffee pots, specified in RFC 2324 by the IETF on 1 April 1998.
Hyper-converged infrastructure
Hyper-converged infrastructure (HCI) is a software-defined data center architecture that integrates compute, storage, networking, and virtualization on clusters of commodity x86 servers, first marketed by Nutanix in 2011.
Hyper-heuristic
A hyper-heuristic is an automated method for selecting or generating heuristics to solve computational search problems, aiming to raise the level of generality of optimization systems across problem domains.
Hyper-reduction
Hyper-reduction is a computational technique in model order reduction that speeds up reduced-order simulations by evaluating nonlinear terms only at a small set of sample points.
Hyper-threading
Hyper-Threading Technology, announced by Intel in 2001, is its implementation of simultaneous multithreading, letting one physical CPU core execute two code streams at once as two logical processors.
Hyper-V
Hyper-V, also known as Microsoft Hyper-V or Windows Server Virtualization, is Microsoft's hypervisor-based virtualization technology built into Windows Server that runs multiple isolated operating systems on one hardware platform.
Hyperbaric welding
Hyperbaric welding, also known as underwater welding, is welding done at elevated ambient pressure in a sealed chamber placed around the workpiece and pressurized to the water depth, a principal repair technique for subsea pipelines.
Hyperbola-1
Hyperbola-1 (双曲线一号, SQX-1) is a four-stage solid-propellant orbital rocket developed by the private Chinese company iSpace, the first privately funded Chinese rocket to reach orbit in 2019.
Hyperbolic trajectory
A hyperbolic trajectory, also called a hyperbolic orbit, is the open path of a body moving under gravity with more than escape energy, corresponding to eccentricity greater than 1.
HyperCard
HyperCard was a hypermedia authoring and database program for the Macintosh, created by Bill Atkinson, released by Apple in 1987, and organized into cards and stacks.
HyperCLOVA (model family)
HyperCLOVA is a family of large language models developed by the Korean internet company NAVER, specialized in Korean language and culture, first released in 2021 and expanded into the HyperCLOVA X line.
Hypercube topology
Hypercube topology is an interconnection network for parallel computers where each node connects to neighbors whose binary addresses differ in one bit, giving logarithmic diameter but limiting scalability.