61,984 articles
Heinz Neuber
Heinz August Paul Neuber (1906–1989) was a German engineer of technical mechanics whose notch stress work, the Neuber rule and Kerbspannungslehre (1937), founded modern fracture mechanics.
Heinz Nixdorf MuseumsForum
The Heinz Nixdorf MuseumsForum (HNF) is a computer museum in Paderborn, Germany, opened in 1996 in the former Nixdorf Computer AG headquarters and described as the world's largest.
Heinz Wolff
Heinz Wolff, full name Heinz Siegfried Wolff, was a German-born British bioengineer who founded the Brunel Institute for Bioengineering and presented The Great Egg Race.
Heisenbug
A heisenbug is a software bug that disappears or manifests differently when someone attempts to debug it, a term coined around 1983 in a pun on Werner Heisenberg's uncertainty principle.
Heisler locomotive
The Heisler locomotive was an American geared steam locomotive, patented by Charles L. Heisler in 1892 and built from 1894 to 1941 for logging and mining railroads.
Hejin power station
Hejin power station (河津电厂) is a coal-fired power station in Hejin, southwestern Shanxi, China, whose first two 350 MW units were financed with Japanese official development assistance.
Hekinan power station
Hekinan power station (碧南火力発電所, Hekinan Thermal Power Station) is a 4,100 MW coal-fired plant in Hekinan, Aichi Prefecture, Japan, operated by JERA and the largest in Japan.
Hélder A. Santos
Hélder A. Santos is a Portuguese physical chemist and biomedical engineer who heads biomedical engineering at University Medical Center Groningen and researches biodegradable nanoparticle drug delivery.
Helen Toner
Helen Toner is an Australian AI policy researcher who leads Georgetown's CSET and was an OpenAI board member who voted to remove Sam Altman in 2023.
Helensburgh Glow Worm Tunnel
The Helensburgh Glow Worm Tunnel, officially the Metropolitan Tunnel, is a disused 1888 railway tunnel at Helensburgh, Australia, home to a large glow worm colony.
Heliac
A heliac is a type of stellarator, a magnetic fusion confinement device in which the magnetic axis winds helically around the torus, shaped by coils rather than plasma current.
Helical antenna
Helical antenna is a radiating structure formed by winding conductors into a helix, typically over a ground plane. Its concepts were established by John D. Kraus in 1947.
Helical gear
A helical gear is a cylindrical gear with teeth cut at an angle to its axis, making it smoother and quieter than a spur gear.
Helical gear geometry
Helical gear geometry is the set of concepts and formulas for cylindrical gears with teeth cut at a helix angle to the axis, producing smoother, quieter operation than spur gears.
Helical pile
A helical pile, also called a screw pile or helical anchor, is a steel deep foundation rotated into the ground like a screw, patented in 1833.
Helically Symmetric Experiment
The Helically Symmetric Experiment (HSX) is a stellarator fusion research device at the University of Wisconsin–Madison and the only stellarator in the world with a quasi-helically symmetric magnetic field configuration.
Helicarrier
The Helicarrier is a fictional flying aircraft carrier in Marvel Comics, serving as the headquarters of S.H.I.E.L.D. Created by Stan Lee and Jack Kirby, it debuted in 1965.
Helicity Injected Torus
The Helicity Injected Torus (HIT) is a series of plasma physics experiments at the University of Washington in Seattle that develop helicity injection current drive for magnetic confinement fusion.
Helicoidal impact-resistant composites
Helicoidal impact-resistant composites are fiber-reinforced laminates in which fiber layers rotate by a small angle, a bio-inspired arrangement that improves impact resistance and damage tolerance over conventional layups.
Helicopter
A helicopter is a rotorcraft that generates lift with engine-driven rotating blades, allowing vertical takeoff and landing, hovering, and flight forward, backward, and sideways; Igor Sikorsky's VS-300 of 1939 established the common single-rotor design.
Helicopter carrier
A helicopter carrier is a warship with a full-length or near-full-length flight deck built to embark, launch, and recover helicopters for amphibious assault, anti-submarine warfare, and disaster relief.
Helicopter emergency medical services pilots
Helicopter emergency medical services (HEMS) pilots are commercial pilots who fly air ambulance missions, moving patients and transplant organs between scenes, hospitals, and trauma centers.
Helicopter flight controls
Helicopter flight controls are the cockpit inputs, chiefly the collective, the cyclic, and antitorque pedals, that a pilot uses to manage a helicopter's lift, attitude, and heading.
Helicopter rotor
A helicopter rotor is a set of rotating, pitched blades, driven through a transmission, that generates the lift, thrust, and control forces keeping a helicopter airborne and maneuverable.
Helin power station
Helin power station is a coal-fired power station in Horinger, Hohhot, Inner Mongolia, China, with two supercritical units of at least 1,200 megawatts commissioned in 2019.
Heliocentric orbit
A heliocentric orbit, also known as a solar orbit, is an orbit around the Sun, followed by every planet, dwarf planet, asteroid, and comet in the solar system.
Heliogen
Heliogen is an American renewable energy company founded in 2013 and based in Pasadena, California, that develops concentrated solar power systems delivering carbon-free industrial heat, steam, and green hydrogen.
Heliograph
A heliograph is a signaling instrument that transmits messages by reflecting flashes of sunlight from mirrors in Morse code, used by armies worldwide from the 1870s until the 1960s.
Helion Polaris
Helion Polaris is the seventh-generation field-reversed configuration fusion prototype of Helion Energy in Everett, Washington, which in February 2026 demonstrated measurable deuterium-tritium fusion at 150 million degrees Celsius.
HELIOS
HELIOS (High Energy Laser with Integrated Optical-dazzler and Surveillance) is a 60 kW-class US Navy shipboard laser weapon built by Lockheed Martin, fielded aboard the destroyer USS Preble.