Cascade geothermal drilling/corehole N-3

Two core holes have been completed on the flanks of Newberry Volcano, Oregon. Core holes GEO N-1 has a heat flow of 180 mWm-2 reflecting subsurface temperature sufficient for commercial exploitation of geothermally generated electricity. GEO N-3, which has a heat flow of 86 mWm-2, is less encouraging. Considerable emphasis has been placed on the rain curtain'' effect with the hope that a detailed discussion of this phenomenon at two distinct localities will lead to a better understanding of the physical processes in operation. Core hole GEO N-1 was cored to a depth of 1387 m at a site located 9.3 km south of the center of the volcano. Core hole GEO N-3 was cored to a depth of 1220 m at a site located 12.6 km north of the center of the volcano. Both core holes penetrated interbedded pyroclastic lava flows and lithic tuffs ranging in composition from basalt to rhyolite with basaltic andesite being the most common rock type. Potassium-argon age dates range up to 2 Ma. Difficult drilling conditions were encountered in both core holes at depths near the regional water table. Additionally, both core holes penetrate three distinct thermal regimes (isothermal (the rain curtain), transition, and conductive) each having its own unique features based on geophysical logs, fluid geochemistry, age dates, and rock alteration. Smectite alteration, which seems to control the results of surface geoelectrical studies, begins in the isothermal regime close to and perhaps associated with the regional water table

Experiencias en desarrollo rural

IDRC pers CRDI. Compilation on agricultural research for agricultural development in Colombia - studies (1) the need for improvement of living conditions of the agricultural population on small farms (minifundios, farm size) (2) agricultural project evaluation (3) various methods of agricultural production. Bibliography

Potential for geothermal desalination in the southwest United States

Combining the results of standard chemical geothermometry techniques, chemical analysis of ground water and geologic mapping of large sedimentary basins, we have delineated areas in the southwestern United States where geothermal desalination may help to augment deficient water supplies. Ten areas favorable for geothermal desalting have been located within Arizona, New Mexico, and southwest Texas. (10 pages)Documents in the AZGS Document Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact [email protected]

Potential for geothermal desalination in the southwest United States

Combining the results of standard chemical geothermometry techniques, chemical analysis of ground water and geologic mapping of large sedimentary basins, we have delineated areas in the southwestern United States where geothermal desalination may help to augment deficient water supplies. Ten areas favorable for geothermal desalting have been located within Arizona, New Mexico, and southwest Texas. (10 pages)Documents in the AZGS Documents Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact [email protected])

Venciendo las limitaciones a la producción del pequeño agricultor

Publicado también por el Instituto Colombiano Agropecuario bajo el título La producción agrícola en desarrollo rural, como Tomo 2 de la serie "El pequeño agricultor"Versión en inglés disponible en la Biblioteca Digital del IDRC: Removing constraints to small farm production; the Caqueza Projec

Removing constraints to small farm production : the Caqueza Project

Meeting: Canadian Agricultural Economics Society, Annual Meeting, 22-25 June 1975, Brandon, MB, CASpanish version available in IDRC Digital Library: Venciendo las limitaciones a la producción del pequeño agricultorReport on the Caqueza rural development agricultural project in Colombia designed to help agricultural production on small farms - discusses the importance of agricultural credit and agricultural marketing. Bibliography, statistical data

Alpine 1/Federal Final Report - Part 2, Temperature Gradients, Geothermal Potential, and Geology

Temperature gradients in the earth are the result of several heat transfer processes and properties. In the shallow crust and over relatively short depth intervals, conduction and convection are primary processes. Radiative transfer is not important at typical upper crustal temperatures and rock heat production does not change temperature gradients over short depth intervals. Therefore the magnitude of a temperature gradient in a conductive temperature regime is regulated mostly by rock thermal conductivity and local heat flow from the earth's interior. Heat flow is the product of the rock thermal conductivity and the temperature gradient.Documents in the AZGS Document Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact [email protected]

Alpine 1/Federal Final Report - Part 2, Temperature Gradients, Geothermal Potential, and Geology

Temperature gradients in the earth are the result of several heat transfer processes and properties. In the shallow crust and over relatively short depth intervals, conduction and convection are primary processes. Radiative transfer is not important at typical upper crustal temperatures and rock heat production does not change temperature gradients over short depth intervals. Therefore the magnitude of a temperature gradient in a conductive temperature regime is regulated mostly by rock thermal conductivity and local heat flow from the earth's interior. Heat flow is the product of the rock thermal conductivity and the temperature gradient.Documents in the AZGS Documents Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact [email protected])

Technology adaptation in a Colombian rural development project

PhotocopyDiscusses the importance of identification of socioeconomic limitations that may restrict adoption of new technologies by small farmers. Economic analysis is considered necessary in the modification of limitations and requirements for the adoption of the new technology