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Temporal and spatial sources of silica for chert remain poorly constrained. Modern sources to the worlds oceans include silica in rivers > aeolian (dust) deposition > sea floor vents and submarine weathering. However, changes in aridity and dust flux during the Phanerozoic may explain variations in the ocean silica cycle and times and places of chert formation. The chemistry of fine quartz dust (FQD) provides a chemical mechanism for the transformation of FQD to polymorphs of silica in chert; FQD is readily dissolved, then reprecipitated as Opal-A by either biotic or abiotic processes. An unequivocal relation between increases in dust flux and biogenic opal-A in the western Pacific Ocean during the past 200 kyr...
This location is part of the Arizona Mineral Industry Location System (AzMILS), an inventory of mineral occurences, prospects and mine locations in Arizona. SantaCruz91B is located in T23S R14E Sec 28 SE in the Nogales - 15 Min quad. This collection consists of various reports, maps, records and related materials acquired by the Arizona Department of Mines and Mineral Resources regarding mining properties in Arizona. Information was obtained by various means, including the property owners, exploration companies, consultants, verbal interviews, field visits, newspapers and publications. Some sections may be redacted for copyright. Please see the access statement.
Wind power forecasting is becoming an important tool in electricity markets as the amount of wind power rapidly increases. However, the use of wind power forecasting in market operations and among market participants is still at an early stage. We discuss the current use of wind power forecasting in U.S. ISO/RTO markets, and give recommendations for how to make efficient use of the information in state-of-the-art wind power forecasts.
Categories: Publication;
Types: Citation;
Tags: Wind power,
changing,
comparison,
energy,
implementation,
With the continuing increase in world population, and rising standard of living, more and more water will be necessary to satisfy basic human needs. The global picture with regard to water use and availability is very uneven, and the policy options for major sectoral uses -- rural and urban water supply, agricultural requirements and hydro-electric power generation are explored. The social and environmental implications of water development are briefly discussed. Finally, the question of the availability of adequate water to sustain future world population and development to the year 2000 is analysed. It is concluded that the major problem in the area of water-resources development is not one of the Malthusian spectre...
Categories: Publication;
Types: Citation;
Tags: Integrated,
dimensions,
international,
management,
water
A [`]discount rate' for the consumption of future generations from current investments for their benefit is typically composed of two parts: [`]time preference' and an allowance for the lower marginal utility of consumption due to higher average levels of consumption in the future. Time preference would be involved if one were postponing one's own consumption; it has little or nothing to do with income redistribution, which is what greenhouse abatement is about. A lower marginal utility of consumption is an anomaly in income redistribution: we rarely deliberately transfer consumption from the less to the more well-to-do. Time may serve as a kind of measure of distance; we may prefer beneficiaries who are closer...
Categories: Publication;
Types: Citation;
Tags: International,
business,
corporations,
dynamics,
economic,
Mosque near Jaghan (area of Gham). Iran. 1965.
Wood north slope of the Cypress Hills plateau looking east form top at 4650 A.T. (barometer) T. 9 N., R. 3 W. Cypress Hills, Alberta, Canada. August 4, 1920.
Categories: Image;
Tags: Alden, W.C. Collection,
Canada Images,
International,
Photographers,
photo print
Greenland. Solifluction lobes on the side of a kame 1 mile east of Beach Camp, northeast of Thule Air Force Base. August 1953.
Remnant of salt cone, a salt cup, on the rugged perennial rock-salt curst in the northwestern part of Salar de Pedernales. Atacama Province, Chile. Circa 1962.
China. Karst topography, viewed from a boat on the Li River south of Guilin. October 28, 1983.
Silty nitrate-bearing salar crust. Shallow nitrate workings in the southern part of Salar de Pampa Blanca. Antofagasta Province, Chile. Circa 1962. Published in U.S. Geological Survey Professional Paper 811, Figure 28-A. 1974.
View of karst topography taken from boat on trip down the Li River south of Guilin. Roof on boat visible at left. China. October 28. 1983.
Rugged perennial rock-salt crust showing delicate clinker-like texture, southeastern part of Salar de Atacama. Antofagasta Province, Chile. Circa 1962. Published in U.S. Geological Survey Professional Paper 811, Figure 22. 1974.
View of karst topography taken from boat on trip down the Li River south of Guilin. Fog partially obscures karst structures. China, October 28, 1983. (Similar to Photo No. mwh020cp)
Aerial view of Kavir Desert. (Part of plane visible at right.) Iran. 1965.
Aerial view from south of Tehran, of snow-capped Elburz Mountains. Mount Demavend, 18,000-foot altitude, peak at left. (Part of plane visible at lower right.) Iran. 1965.
Sarir surface in Sarir al Gattussa. Close-up view of the pebbles on the sarir surface (sometimes referred to as desert pavement) shown in photo 016. Libya. Circa 1958. Published in U.S. Geological Survey Professional Paper 660, Figure 15-B. 1970.
Silty nitrate-bearing salar crust. Shallow nitrate workings in the southern part of Salar de Pampa Blanca. Antofagasta Province, Chile. Circa 1962. Published in U.S. Geological Survey Professional Paper 811, Figure 28-A. 1974.
Summit Lake from ridge west of Camp 6. Direction northeast. Northwest Boundary, British Columbia, Canada. June 1901.
Categories: Image;
Tags: Canada Images,
International,
Photographers,
Ransome, F.L. Collection,
photo print
Criss-crossing game trails, Atacama Desert, near Vallenar. Chile. No date.
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