Results 21 to 30 of about 58,514 (149)

Exploración regional de rocas ornamentales entre el municipio de Valledupar y las inspecciones de Patillal y Badillo – departamento del Cesar – Colombia

open access: yesBoletín Geológico, 2006
Utilizando técnicas apropiadas de cartografía geológica y selección de áreas promisorias, se identificaron 3 sectores con rocas graníticas de potencial ornamental: Patilla!, La Socola y Las Palomas; sectores que fueron muestreados y caracterizados sus ...
Luis Enrique Bernal Vargas
doaj   +1 more source

Microperforaciones (Tallophyta) sobre bivalvia del Plioceno del Bajo Guadalquivir. Importancia paleoecologica

open access: yesEstudios Geologicos, 1988
Se estudian los principales tipos de microperforaciones atribuidas a la acción de organismos vegetales (Tallophyta) sobre las comunidades características de bivalvos del Plioceno en el Bajo Guadalquivir. En base a su tamaño y modelo de perforación se han
E. Mayoral
doaj   +1 more source

Scientists’ warning on the global destruction of rock outcrop ecosystems

open access: yesConservation Biology, EarlyView.
Abstract Rock outcrops are geological formations that harbor a highly specialized biota adapted to harsh environmental conditions that differ from their surrounding landscapes. They are globally distributed, especially in old, highly weathered landscapes, and can function as habitat islands containing high levels of endemism and distinct evolutionary ...
Luiza F. A. de Paula   +19 more
wiley   +1 more source

Insights on Prioritization Methods for Mining Exploration Areas: A Case Study of the Tiltil Mining District, Chile

open access: yesMining
This study proposes a simple and replicable methodology to prioritize mining exploration projects based on their geoscientific characteristics and contextual factors, which can be adapted to different mining contexts.
Claudio Sebastián Molina   +3 more
doaj   +1 more source

AI Public Value Creation: Data Encoding, Aggregation, and Algorithmic Computation

open access: yesPublic Administration, EarlyView.
ABSTRACT AI systems in public administration challenge the premise that value creation arises from managers' strategic mediation among the vertices of Moore's strategic triangle: Public value, legitimacy, and operational capacity. AI imposes new logics that reshape vertices and their interaction dynamics.
Antonio Cordella, Francesco Gualdi
wiley   +1 more source

Producción cerámica de la Tradición Tafí. Estudios tecnológicos de la alfarería arqueológica de la Ciénega (Tucumán, noroeste de Argentina).

open access: yesRevista do Museu de Arqueologia e Etnologia, 2003
Este trabalho é uma contribuição ao conhecimento da produção cerâmica da Tradição Tafí do noroeste da Argentina. São apresentados os resultados obtidos de um conjunto de técnicas analíticas aplicadas a olarias dos sitios formativos da vertente La Ciénega:
María Beatriz Cremonte
doaj   +1 more source

Governance Structures, Political Change and Executive Turnover in State‐Owned Enterprises: Evidence From Chile

open access: yesRegulation &Governance, EarlyView.
ABSTRACT To address the shortcomings associated with state ownership, countries have implemented various legal strategies to curb political influence in state‐owned enterprises. This research studies whether these strategies constrain the government's ability to use their appointment powers for political considerations.
Pablo Torres
wiley   +1 more source

Making Mining Licit: Gold, Commodification, and the Everyday Performance of Law in Colombia

open access: yesAmerican Anthropologist, Volume 128, Issue 3, Page 480-493, September 2026.
ABSTRACT Ethnographies of resource‐making have shown that the extraction of resource value from objects is premised on obviating the emplaced lifeworlds that surrounded objects before they traveled to consumer markets. Much of this literature looks at such supply‐chain disentanglement from the viewpoint of corporate and formal regulatory practices ...
Jesse Jonkman
wiley   +1 more source

Assessment of Diesel Engine Exhaust Levels in an Underground Mine Before and After Implementing Diesel Particulate Filters (DPF) and Selective Catalytic Reduction (SCR) Systems

open access: yesClean Technologies
Diesel-powered machinery is the primary energy source in underground mining, exposing workers to hazardous diesel exhaust emissions. This study evaluates occupational exposure to diesel particulate matter (DPM) and gaseous pollutants (NO, NO2) at an ...
Pablo Menendez-Cabo   +1 more
doaj   +1 more source

Conservation implications of low contemporary connectivity along the Mid‐Atlantic Ridge in hydrothermal vent gastropods

open access: yesConservation Biology, Volume 40, Issue 4, August 2026.
Abstract Polymetallic sulfide deposits produced at hydrothermal vent fields are targets for mining exploitation along the Mid‐Atlantic Ridge, threatening the functioning and resilience of vent ecosystems that provide multiple ecosystem services. Knowledge about connectivity between vents will inform conservation practices.
E. Portanier   +10 more
wiley   +1 more source

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