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GEOStar
GEOStar is a family of geostationary commercial communications satellite buses developed by Orbital Sciences Corporation and now produced by Northrop Grumman, with more than 50 satellite contracts.
Geostationary slot
A geostationary slot is a longitude position on the geostationary arc, about 35,786 km above the equator, that operators hold through the International Telecommunication Union together with assigned frequencies.
Geostationary transfer orbit
The geostationary transfer orbit, also known as the geosynchronous transfer orbit or GTO, is a highly elliptical parking orbit with perigee near low Earth orbit and apogee at geostationary altitude.
Geosteering
Geosteering, also called real-time well placement, is a drilling technique that uses real-time geological data to keep the wellbore within the target reservoir, mainly in horizontal wells.
Geosynchronous satellite
A geosynchronous satellite is an artificial satellite whose orbital period matches Earth's rotation, circling at about 35,900 km above the surface; a circular equatorial one appears motionless.
Geosynchronous Satellite Launch Vehicle
The Geosynchronous Satellite Launch Vehicle (GSLV) is a three-stage expendable rocket developed by India's ISRO, first flown in 2001 to place communication satellites into geostationary transfer orbit.
Geosynchronous transfer using electric propulsion
Geosynchronous transfer using electric propulsion is the technique of raising a communications satellite to geostationary orbit with low-thrust electric thrusters over months, saving about 40% launch mass.
Geosynthetic pavement interlayer
A geosynthetic pavement interlayer is a planar polymeric product, such as a paving fabric or grid, placed between pavement layers to resist cracking and water infiltration.
Geosynthetic reinforcement
Geosynthetic reinforcement is the use of polymeric materials, principally geogrids and geotextiles, placed within soil to restrain deformation and increase bearing capacity, used in roads, walls, slopes, and railroads.
Geotechnical centrifuge modeling
Geotechnical centrifuge modeling is a physical modeling technique that spins small-scale soil models at elevated gravity, matching full-scale stresses so scaled models reproduce real foundation, dam, and slope behavior.
Geotechnical engineering
Geotechnical engineering, also known as soils engineering, is the branch of civil engineering that applies mechanics and hydraulics to soil behavior, designing foundations, retaining walls, dams, tunnels, and pavements.
Geotechnical investigation
Geotechnical investigation, also called site investigation, explores a site's soil, rock, and groundwater through drilling, in-situ testing, and laboratory testing, producing a geotechnical report that guides foundation design.
Géotechnique
Géotechnique is a peer-reviewed scientific journal covering geotechnical engineering, founded in 1948 and published monthly, spanning soil and rock mechanics, engineering geology, and environmental geotechnics.
Geotextile tube
A geotextile tube is a large, elongated container of water-permeable geotextile fabric filled hydraulically with sand or dredged material, used in coastal protection and flood control.
Geothermal district heating
Geothermal district heating supplies heat from underground hot water reservoirs through a shared pipe network to many buildings; global capacity reached about 13 GWth in 2019, delivering roughly 163 PJ per year.
Geothermal doublet
A geothermal doublet is a pair of wells drilled into the same geothermal reservoir: a production well brings hot water up, and an injection well returns the cooled water.
Geothermal energy
Geothermal energy is heat drawn from reservoirs of hot water and rock beneath Earth's surface, used directly for heating or converted into continuous, carbon-free electricity.
Geothermal play fairway analysis
Geothermal play fairway analysis (PFA) is a statistical exploration method, adapted from oil and gas, that combines geologic datasets into favorability maps for finding geothermal resources.
Geothermal power
Geothermal power, or geothermal electricity, is electricity generated from heat in hot rock or fluids deep underground, with plants operating in 35 countries as of 2024.
Geothermal reservoir engineering
Geothermal reservoir engineering is the branch of reservoir engineering that applies scientific principles to developing and producing geothermal reservoirs, predicting changes in pressure, temperature, and fluid flow.
Geothermal resource assessment
Geothermal resource assessment is the set of methods used to estimate the power or heat a geothermal field can sustainably deliver, relying mainly on the USGS volumetric method before drilling and numerical reservoir simulation during production.
GEOVIA Whittle
GEOVIA Whittle is strategic open-pit mine optimization software sold by GEOVIA, a Dassault Systèmes brand, used to evaluate deposits and plan mines to maximize net present value.
Gepard-class frigate
The Gepard-class frigate, Russian Project 11661, is a class of light guided-missile frigates built at the Zelenodolsk shipyard in Tatarstan, with Vietnam as its largest export customer.
Gephi
Gephi is a free, open-source desktop application for interactive visualization and analysis of networks and graphs, first released in 2008 and widely used in research, handling networks of up to 1 million nodes.
Gerald A. Leonards
Gerald A. "Jerry" Leonards was a Canadian-born American geotechnical engineer, longtime Purdue University professor, and editor of the standard reference Foundation Engineering, elected to the National Academy of Engineering in 1988.
Gerald B. Stringfellow
Gerald B. "Jerry" Stringfellow (1942–2025) was an American materials scientist at the University of Utah who pioneered organometallic vapor-phase epitaxy, the crystal-growth process behind red, orange, yellow, and green LEDs.
Gerald Bull
Gerald Bull, also known as Gerry Bull, was a Canadian artillery engineer who led Project HARP, designed the GC-45 howitzer, and was assassinated in Brussels in 1990.
Gerald Carr (astronaut)
Gerald Paul Carr, known as Jerry Carr, was an American NASA astronaut and Marine Corps colonel who commanded Skylab 4, the final crewed mission to the Skylab space station, in 1973 and 1974.
Gerald Desmond Bridge
The Gerald Desmond Bridge was a steel-truss through-arch highway bridge in Long Beach, California, opened in 1968 and replaced in 2020 by the Long Beach International Gateway Bridge.
Gerald E. Galloway Jr.
Gerald E. Galloway Jr. is an American civil engineer, retired Army brigadier general, and University of Maryland professor emeritus known for leading the study of the Great Flood of 1993.