Results 31 to 40 of about 358,088 (171)

¿Se acaba el petróleo? [PDF]

open access: yes, 2008
Este ARI considera la posibilidad de que se llegue al fin de la era del petróleo y repasa los distintos aspectos de una situación muy compleja y dependiente de múltiples factores.
Benavides, Pablo
core  

Confirming the impact origin of the São Miguel do Tapuio structure, northeastern Brazil

open access: yesMeteoritics &Planetary Science, EarlyView.
Abstract The São Miguel do Tapuio structure (SMT) is a remarkable, nearcircular feature of about 21 km diameter, centered at 5°37.6′ S, 41°23.3′ W in Piauí state, northeastern Brazil. The structure is located within the sedimentary strata of the Paleozoic–Mesozoic Parnaíba Basin and predominantly comprises sandstones of the Devonian Pimenteiras and ...
Alvaro Penteado Crósta   +9 more
wiley   +1 more source

El papel del petróleo en el conflicto iraquí (II): ¿Jugada Imperial o liderazgo responsable? [PDF]

open access: yes, 2003
La tesis “sangre por petróleo” (o blood for oil) ha sido utilizada cada vez más frecuentemente durante los últimos meses por la prensa y las varias tendencias de la oposición popular a la guerra contra Irak.
Isbell, Paul
core  

Arbuscular mycorrhizal fungal (AMF) communities in sand bars associated with Ipomoea pes‐caprae: a promising strategy for petroleum spill bioremediation in coastal dunes

open access: yesRestoration Ecology, EarlyView.
Abstract Introduction Polycyclic aromatic hydrocarbons (PAHs), a class of petroleum‐derived compounds known for causing cellular damage and for their recalcitrant behavior, severely limit effective biodegradation. Arbuscular mycorrhizal fungi (AMF) from oil‐contaminated environments can mitigate PAH‐related stress on host plants, highlighting the ...
Ocimar F. de Andrade   +7 more
wiley   +1 more source

Centro Nacional de Investigaciones Científicas

open access: yesRevista CENIC Ciencias Químicas, 2006
La huella dactilar mediante Cromatografía Gaseosa Capilar de Alta Resolución fue obtenida para 18 muestras de crudos de petróleo cubano de dos yacimientos: 9 de Pina y 9 de Puerto Escondido. El análisis fue realizado usando columna capilar DB-1 (J&W), de
Gloria Llabre Raurell   +5 more
doaj  

Inter-well tracer tests in oil reservoirs using different optimization methods: A field case

open access: yesGeofísica Internacional, 2005
En la interpretación de pruebas de trazadores entre pozos en yacimientos petroleros, geotérmicos y en acuíferos se emplean diversos métodos de regresión no lineal para determinar algunas de las propiedades físicas promedio del sistema roca fluido.
J. Ramírez-Sabag   +2 more
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

METODOLOGÍA PARA LA OPTIMIZACIÓN DE PARÁMETROS DE PERFORACIÓN A PARTIR DE PROPIEDADES GEOMECÁNICAS

open access: yesRevista Fuentes El Reventón Energético, 2012
Drilling optimization is focused on time operational cost reduction. This can be accomplished from the evaluation of drilling parameters used during offset wells drilling and the development of continuous improvement programs and performance efficient ...
Diego Fernando Suárez   +2 more
doaj  

Relación entre el precio del petróleo y la tasa de cambio: el caso Colombiano (2000 – 2017) [PDF]

open access: yes, 2018
Trabajo de InvestigaciónLos precios internacionales del petróleo están actualmente influenciando la fluctuación de la tasa de cambio nominal, logrando que los precios de los bienes y servicios que depende de estas variables tengan un comportamiento muy ...
Aragón-Calderón, Marlon Alexander   +1 more
core  

The Goldilocks Effect: How the “Just Right” Writing Styles of Global Corporate Responsibility Frameworks Shapes Their Use by Businesses

open access: yesRegulation &Governance, EarlyView.
ABSTRACT The 21st century has witnessed a surge in the number of global corporate responsibility (GCR) frameworks issued by international organizations (IOs). Our study investigates whether and to what extent these frameworks shape businesses' Corporate Social Responsibility (CSR) communications.
Adam William Chalmers   +1 more
wiley   +1 more source

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