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Hard carbon
Hard carbon is a non-graphitizable form of carbon, made by carbonizing biomass or resin at 1000–1600 °C, and is the dominant anode material for sodium-ion batteries.
Hard carbon anode
A hard carbon anode is a battery negative electrode made from hard carbon, a disordered amorphous carbon that cannot be converted into graphite even above 3000 °C, and the leading anode for sodium-ion batteries.
Hard carbon anodes for sodium-ion batteries
Hard carbon anodes for sodium-ion batteries are disordered carbon materials that store sodium through adsorption, intercalation, and pore filling, since graphite stores little sodium, making hard carbon the leading anode candidate.
Hard disk drive
A hard disk drive (HDD) is a non-volatile storage device that records digital data on rapidly rotating magnetic platters and remains the dominant medium for bulk data storage.
Hard disk drive failure
Hard disk drive failure (HDD failure) is the event of a hard disk drive ceasing to work or becoming untrustworthy, measured in large data centers by annualized failure rates.
Hard disk drive performance characteristics
Hard disk drive performance characteristics are the measurable behaviors of rotating magnetic drives: seek time, rotational latency, sequential throughput, random IOPS, and workload limits set by recording technology.
Hard disk drive platter
A hard disk drive platter, or hard disk platter, is the rigid circular disk inside a hard disk drive on which data is magnetically recorded.
Hard negative mining
Hard negative mining is a machine learning training technique that selects the negative examples a model currently scores wrongly or highly, such as background windows causing false alarms, and trains on those.
Hard Rock Hotel and Casino
The Hard Rock Hotel and Casino was a rock-music-themed resort near the Las Vegas Strip, opened by Peter Morton in 1995 and rebranded as Virgin Hotels Las Vegas in 2021.
Hard Rock Las Vegas
Hard Rock Las Vegas names two rock-music-themed Las Vegas resorts: the original Hard Rock Hotel & Casino, open 1995 to 2020, and a Strip resort under construction.
Hard shoulder running
Hard shoulder running, also called part-time or temporary shoulder use, is a traffic management strategy that opens a road's paved shoulder as a travel lane during peak hours.
Hard turning
Hard turning is a machining process that cuts hardened steel at 45 to 65 HRC with superhard PCBN or ceramic tools, replacing grinding as a finishing step.
Hard water
Hard water, also called water hardness, is water with high dissolved calcium and magnesium, picked up from soil and rock, which makes lathering harder and leaves scale in pipes.
Hard X-ray Modulation Telescope
The Hard X-ray Modulation Telescope (HXMT), renamed Insight-HXMT after launch, is China's first X-ray astronomy satellite, launched on June 15, 2017 to study black holes, pulsars, and gamma-ray bursts.
Hardanger Bridge
The Hardanger Bridge (Hardangerbrua) is a suspension bridge on Norwegian National Road 13 across the Hardanger Fjord, opened in 2013 with the longest main span in Norway, 1,310 meters.
Hardcover
A hardcover, also called hardback or hardbound, is a book bound with a rigid protective cover of stiff boards wrapped in cloth, paper, or leather, made by case binding.
Hardenability
Hardenability is the depth to which steel hardens when quenched from its austenitizing temperature, distinct from hardness and raised by alloying elements like chromium, molybdenum, and boron.
Hardfacing
Hardfacing is a welding or surfacing process that deposits a wear-resistant alloy layer onto metal components to extend their service life against abrasion and erosion.
Hardinge
Hardinge is an American machine tool company founded in Chicago in 1890 by the Hardinge brothers, known for precision lathes and workholding; its assets were sold in a 2024 bankruptcy.
Hardisty
Hardisty is a small town in east-central Alberta, Canada, serving as the country's principal crude oil storage, blending, and pipeline hub, and the pricing point for Western Canadian Select.
Hardmask
A hardmask is a rigid inorganic layer, typically metal, metal oxide, or nitride, that transfers a lithographic pattern into underlying films after the photoresist is stripped.
Hardness test
A hardness test measures a material's resistance to localized deformation, typically by pressing an indenter into the surface under load; methods include Brinell, Vickers, Rockwell, and Knoop.
Hardox
Hardox is a family of abrasion-resistant, through-hardened wear steels trademarked by the Swedish steelmaker SSAB, first launched in 1974 and used in dump trucks, buckets, and mining equipment.
Hardpoint
A hardpoint, also called a weapon station, is a reinforced attachment point on a military aircraft where external stores like bombs, missiles, and fuel tanks mount, usually on a pylon.
Hardtop
A hardtop is an automobile body style with a rigid metal roof and no center pillar between the side windows, pioneered by the 1949 Buick Roadmaster Riviera.
Harduaganj power station
Harduaganj Thermal Power Station (हरदुआगंज तापीय परियोजना) is a coal-fired power station of at least 1,270 MW at Kasimpur in Aligarh district, Uttar Pradesh, India.
Hardware abstraction layer
A hardware abstraction layer (HAL) is a software layer between hardware and the operating system that hides hardware details, letting the same drivers run across platforms.
Hardware acceleration
Hardware acceleration is the use of dedicated hardware, such as GPUs, FPGAs, or TPUs, rather than general-purpose CPU execution, to perform specific computations faster or more efficiently.
Hardware description language
A hardware description language (HDL) is a specialized computer language for describing digital circuits, used for simulation and synthesis into logic gates, with Verilog and VHDL the dominant examples.
Hardware emulation
Hardware emulation is a pre-silicon chip verification method that maps an RTL design onto programmable hardware, running hundreds of thousands to millions of times faster than simulation.