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Digitale Medien

Impact of Coal Ash from Electric Power Production on Changes in Water Quality (1982)

Guthrie, R. K. ; Davis, E. M. ; Cherry, D. S. ; [weitere]

Oxford, UK : Blackwell Publishing Ltd

Journal of the American Water Resources Association 18 (1982), S. 0

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ISSN: 1752-1688

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Architektur, Bauingenieurwesen, Vermessung , Geographie

Notizen: : Since 1972 the use of coal in the U.S. has increased much more rapidly than predicted, with much of this increased use by electric power generating plants. Residue after combustion consists primarily of inorganic materials, with the majority of chemical elements concentrated in fly ash as is sulfate. The concentration of sulfate in this ash fraction most affects the chemical and physical state of other elements when fly ash comes in contact with water by lowering the pH. In a properly constructed and operated ash settling basin, however, major water quality parameters of effluent may be improved as compared to source water. It is necessary, however, to consider the solubility or deposition in sediment of potentially toxic chemical elements from fly ash as these may affect reuse of this water, or as they may impact other parts of the aquatic environment.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1752-1688.1982.tb04542.x

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2

Digitale Medien

Prospect Risk Analysis Applied to Ground-Water Reservoir Evaluation (1982)

Davis, George H.

Oxford, UK : Blackwell Publishing Ltd

Ground water 20 (1982), S. 0

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ISSN: 1745-6584

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Energietechnik , Geologie und Paläontologie

Notizen: A methodology is proposed which provides predevelopment assessments of the potential yield of ground-water reservoirs. A systematic assessment of aquifer parameters leads to estimates of ground-water storage capacity and the geologic risks that may affect those estimates. Area of reservoir, average saturated thickness of aquifers to a limit of economic dewatering, and average specific yield, all arrived at through a Delphi procedure are combined in a Monte Carlo simulation to yield an unrisked product at several probability levels. Marginal probabilities are assigned to each parameter and combined in a further Monte Carlo simulation to yield a series of risked estimates. The results are expressed in a table and as cumulative probability curves of ground-water storage capacity that can provide a basis for economic modeling. The method is analogous to methods widely applied in the petroleum and other extractive industries. All basic hydrogeologic data are laid out in a systematic way, permitting planners to compare reservoirs on a common basis and to judge the reliability of the estimates. Once the geologic models have been developed, they can be updated readily as additional information becomes available. The method is particularly well-suited to preliminary assessments of the development potential of undeveloped or poorly-explored areas, and to regional evalution where only parts of the regional have been subject to intensive ground-water development.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1745-6584.1982.tb01383.x

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3

Digitale Medien

Flavor and Selected Chemical Components of Ground Beef from Steers Backgrounded on Pasture and Fed Corn up to 140 Days (1982)

MELTON, S. L. ; BLACK, J. M. ; DAVIS, G. W. ; [weitere]

Oxford, UK : Blackwell Publishing Ltd

Journal of food science 47 (1982), S. 0

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ISSN: 1750-3841

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung

Notizen: Flavor and selected chemical components of ground beef from 60 steers were studied as a function of days (up to 140) that corn was fed to steers after grazing on pasture. During the 140 days on corn, significant changes occurred in the fatty acid composition of ground beef and in its carbohydrate content, titratable acidity, volatile fatty acid content, aroma and flavor. Flavor changes were related to certain chemical components. Results indicate that finishing cattle on corn for periods longer than 80–90 days causes little change in beef flavor.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1365-2621.1982.tb12694.x

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4

Digitale Medien

Relationship of USDA Maturity Groups to Palatability of Cooked Beef (1982)

SMITH, G.C. ; CROSS, H.R. ; CARPENTER, Z.L. ; [weitere]

Oxford, UK : Blackwell Publishing Ltd

Journal of food science 47 (1982), S. 0

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ISSN: 1750-3841

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung

Notizen: In comparison to carcasses of B, C or E maturity, carcasses of A maturity produced broiled steaks which: (a) had higher (P 〈 0.05) palatability ratings in 62 to 86% of comparisons, (b) were decidedly less variable (C.V.), (c) were more likely to be assigned high (≥ 6.00) and less likely to be assigned low (≤ 2.99) sensory panel ratings, and (d) were more likely to have low (≤ 3.63 kg) and less likely to have high (≥ 6.35 kg) shear force values. Position within the A or A + B maturity group(s) explained 0–4% (loin steaks) and 10–18% (round steaks) of the observed variation in overall palatability ratings and/or shear force values.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1365-2621.1982.tb07627.x

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5

Digitale Medien

FACTORS INVOLVED IN EVALUATING GROUND WATER IMPACTS OF DEEP COAL MINE DRAINAGE (1982)

Davis, Phillip R. ; Walton, William C.

Oxford, UK : Blackwell Publishing Ltd

Journal of the American Water Resources Association 18 (1982), S. 0

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ISSN: 1752-1688

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Architektur, Bauingenieurwesen, Vermessung , Geographie

Notizen: : The determination of probable ground water impacts of proposed deep coal mining is required as part of permit applications. Impact prediction generally involves well production test analysis and modeling of ground water systems associated with coal seams. Well production tests are often complicated due to the relatively low permeabilities of sandstones and shales of ground water systems. The effects of the release of water stored within finite diameter production wells must be considered. Well storage capacity appreciably affects early well production test time drawdown or time recovery data. Low pumping rates, limited cones of depression, and length of required pumping periods ate important well production test design factors.Coal seam ground water system models are usually multilayered and leaky artesian. Mine drafts partially penetrate the ground water system. Simulation of coal mine drainage often involves the horizontal permeability and storage coefficient of the coal seam zone, vertical permeabilities of sandstones and shales (aquitard) above and below the coal seam zone, and the hydrologic properties of the source bed above the aqultard overlying the coal seam zone. Ground water level declines in both the coal seam zone and source bed near land surface are necessary factors in impact analysis. An example of evaluation studies in southwest Indiana will illustrate factors involved in deep coal mine drainage modeling efforts.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1752-1688.1982.tb00080.x

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