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- The polymer of galactose with a repeating unit of C6H10O5. Found in hemicellulose it can be hydrolyzed to galactose.
- Browse Related Terms: ACID, Acid hydrolysis, alkaline hydrolysis, amylase, base, Cellulase, galactan, hemicellulose, hexose, hydrolysis, monosaccharide, polymer, polysaccharide, saccharide, saccharification
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- A six-carbon sugar with the formula C6H1206. A product of hydrolysis of galactan found in the hemicellulose fraction of biomass.
- Browse Related Terms: arabinose, Bagasse, disaccharides, galactose, glucose, holocellulose, mannose, xylose
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A chemical element, metallic in nature, used in making certain kinds of solar cells and semiconductor devices.
- Browse Related Terms: AC, Alternating current (AC), Battery, Build-out capacity, Cadmium (Cd), DC, Direct current (DC), DNI, Electrolytes (battery), Gallium (Ga), Inverter, Irradiance, Photovoltaic (PV) cell, Power conditioning system (PCS)
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In a visual impact analysis context, a break or interruption (as in a row of mountains) or similar topographic void through which the landscape may be viewed.
- Browse Related Terms: gap, Landmark, Nonpoint light source, Point light source, Sky glow, Surface texture, Texture, Texture contrasts, Viewer distance, Viewpoint, Viewshed, Visual attention, Visual clutter, Visual resources
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A piston engine that uses gaseous fuel rather than gasoline. Fuel and air are mixed before they enter cylinders; ignition occurs with a spark.
- Browse Related Terms: Cetane, Combustion air, Diesel engine, Dutch oven furnace, Facultative ponds, Fluidized-bed boiler, Fly ash, Fuel-cell furnace, Gas engine, Inclined grate, Reinjection, Spreader stoker furnace, Traveling Grate
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A process in which carbon monoxide and hydrogen react in the presence of a catalyst to form methane and water.
- Browse Related Terms: benzene, carbohydrate, Chemical oxygen demand (COD), Chlorofluorocarbon, Dioxin, Gas shift process, herbicide, Hydrocarbon, hydrolysis, Inorganic compounds, Liquid hydrocarbon, Organic compounds, Toxic substances
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(combustion turbine) A turbine that converts the energy of hot compressed gases (produced by burning fuel in compressed air) into mechanical power. Often fired by natural gas or fuel oil.
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Sometimes called a combustion turbine; a gas turbine converts the energy of hot compressed gases (produced by burning fuel in compressed air) into mechanical power, which can be used to generate electricity.
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A chemical or heat process to convert a solid fuel to a gaseous form.
- Browse Related Terms: Biomass fuel, Chips, Densification, fast pyrolysis, Fossil fuel, Gasification, Gasifier, Indirect liquefaction, Liquefaction, Pyrolysis, slow pyrolysis
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Any chemical or heat process used to convert a feedstock to a gaseous fuel.
- Browse Related Terms: Biofuels, co-generation, combustion, ethanol, Gasification, Greenhouse Effect, gross heat of combustion, net heat of combustion, Oxygenate, Pyrolysis, slow pyrolysis
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A device for converting solid fuel into gaseous fuel. In biomass systems, the process is also referred to as pyrolitic distillation. See pyrolysis.
- Browse Related Terms: Biomass fuel, Chips, Densification, fast pyrolysis, Fossil fuel, Gasification, Gasifier, Indirect liquefaction, Liquefaction, Pyrolysis, slow pyrolysis
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A device that converts solid fuel to gas. Generally refers to thermochemical processes.
- Browse Related Terms: Adsorption, attainment area, auger, Capacity, Carbon Dioxide, carbon monoxide, Combustion air, dewatering, fixed bed, fluidized bed, Fly ash, gas turbine, Gasifier, Grid, Particulates, screen analysis, scrubber, Steam Turbine, wet scrubber
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A motor vehicle fuel which is a blend of 90 percent unleaded gasoline with 10 percent ethanol (by volume). This term was used in the late 1970s.
- Browse Related Terms: alcohol, Alternative fuel, anhydrous, Biodiesel, Biofuels, Butane, Compressed Natural Gas (CNG), E85, Ethyl tertiary butyl ether (ETBE), Flexible-fuel vehicle, Gasohol, Methane, Methanol, Methyl tertiary butyl ether (MTBE), Oxygenated gasoline, Syngas
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- See Renewable Resource Generation Development Areas
- Browse Related Terms: Clovis Complex, Designated Roads and Trails, GDAs, Indian trust resources, Interpretive site, Known Geothermal Area (KGA), Lease, Off-road vehicle (OHV) designations, Pueblo, Quad-level occurrence, Sacred site, Social disruption, USGS, Water code
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An organism that can survive under a wide variety of conditions, and does not specialize to live under any particular set of circumstances.
- Browse Related Terms: Amphibian, Crucial winter range, Generalist (species), Herpetofauna, Hunting, Ostracods, Reptile, Subsistence, Vertebrate, zooplankton
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A machine used for converting rotating mechanical energy to electrical energy.
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: A land area with generally similar meteorological and geographic conditions throughout. To the extent possible, air basin boundaries are defined along political boundary lines and include both the source and receptor areas.
- Browse Related Terms: Area of Potential Effect (APE), Bald and Golden Eagle Protection Act, Build out, Census block, Census block groups, Critical Habitat, Endemic, First in time, first in right, Geographic air basin, Landscape, Maintenance area, Military Training Route (MTR), Prior Appropriation Doctrine, Senior water rights
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A computer system for performing geographical analysis. GIS has four interactive components: an input subsystem for converting into digital form (digitizing) maps and other spatial data; a storage and retrieval subsystem; an analysis subsystem; and an output subsystem for producing maps, tables, and answers to geographic queries.
- Browse Related Terms: Center pivot irrigation, Closed-loop cooling system, Dry closed-loop cooling, Dry cooling, Dry cooling system, entrainment, Fujita Scale, Geographic Information System (GIS), GIS, Hybrid (wet-dry cooling) systems, Livestock guzzler, Pan evaporation, Reuse, Silencer, Wet closed-cycle cooling system, Wet cooling system
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The science that deals with the study of the materials, processes, environments, and history of the Earth, including the rocks and their formation and structure.
- Browse Related Terms: Aquifer-confined, Debris flow, Deposit, Geology, Glacial till, Groundwater, Rock outcrop, Seepage, Tectonic
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As the sound moves away from the source, the area that the sound energy covers becomes larger and thus sound intensity decreases. This is referred to as "geometric spreading," which is independent of frequency and plays a major role in sound propagation situations. Due to geometric spreading, the sound level is reduced by 6 dB and 3 dB for each doubling of distance from the point (e.g., fixed equipment) and line (e.g., road traffic) sources, respectively.
- Browse Related Terms: Atmospheric absorption, attenuation, Background level noise, Broadband noise, Chronic effects, Day-night average noise level, Daytime mean rural background level, Decibel (dB), Decibel, A-weighted (dBA), Geometric spreading, Hertz (Hz), Ldn, Leq, MCL, Nighttime mean rural background level, Noise
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Pertaining to those processes that affect the form or shape of the surface of the earth.
- Browse Related Terms: Aerobic, Anaerobic, Biosphere, Carbon Sequestration, Geomorphic, Greenhouse Effect, greenhouse gases, Nitrogen fixation, Ozone, Smog, substrate, Valley segment
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Refers to the use of scientific methods and engineering principles to acquire, interpret, and apply knowledge of earth materials for solving engineering problems.
- Browse Related Terms: Borrow pit, Crustal spreading center, Cut-and-fill, Extensional (structural features or faults), Geotechnical, Landform, Lava, Mantle, Precambrian, Rift, Seismic, Special Use Airspace (SUA), Topography, Troposphere, Volcanic chain, Volcanism