Results 21 to 30 of about 5,037,008 (338)

Influence of extraction methods on the composition of essential oils of Achillea millefolium L. from Lithuania [PDF]

open access: yes, 2014
In this study, flowering aerial parts of Achillea millefolium were used as a matrix for supercritical CO2 extraction (SFE) of volatile oil. The collected extracts were analyzed by GC-FID and GC-MS methods and their composition were compared with that of ...
Bagdonaite, E.   +4 more
core   +1 more source

Sur la corde raide : rente pétrolière et développement en Équateur (1972-2017)

open access: yesRevue de la Régulation, 2022
This article deals with the conditions of oil rent management in Ecuador during the oil era (1972-2017) from an historical and institutional perspective.
Constantin Lopez
doaj   +1 more source

Oil Spill Detection Analyzing “Sentinel 2“ Satellite Images: A Persian Gulf Case Study [PDF]

open access: yes, 2018
Oil spills near exploitation areas and oil loading ports are often related to the ambitions of governments to get more oil market share and the negligence at the time of the loading in large tankers or ships.
GROPPI, DANIELE   +4 more
core   +1 more source

Dry oil powders and oil foams stabilised by fluorinated clay platelet particles [PDF]

open access: yes, 2013
A series of platelet sericite particles coated to different extents with a fluorinating agent has been characterised and their behaviour in mixtures with air and oil studied.
Binks, Bernard P.   +2 more
core   +1 more source

Flow coupling during three-phase gravity drainage [PDF]

open access: yes, 2011
We measure the three-phase oil relative permeability k(ro) by conducting unsteady-state drainage experiments in a 0.8 m water-wet sand pack. We find that when starting from capillary-trapped oil, k(ro) shows a strong dependence on both the flow of water ...
Aminzadeh, B.   +3 more
core   +1 more source

Análisis de la sostenibilidad del modelo económico venezolano: chavismo, petróleo y distribución de la renta [PDF]

open access: yesRevista Iberoamericana de Estudios de Desarrollo, 2017
This paper analyzes the Venezuelan economic model during the governments of Hugo Chávez and Nicolás Maduro (1999-2016), in order to find out if it is in a circumstantial crisis or in a bankruptcy of unsustainability.
Hernández-Martínez, D.   +1 more
doaj   +1 more source

Identifikasi Gugus Fungsi Minyak Buah Nipa (Nypa fructicans) Kaliwanggu Teluk Kendari Sulawesi Tenggara

open access: yesJournal of Tropical Pharmacy and Chemistry, 2011
Nipa is one of the vegetation mangroves in Southeast Sulawesi that optimal utilization by people in this region is not optimal because less of information.
Rolan Rusli   +3 more
doaj   +1 more source

Oil film measurement in polytetrafluoroethylene-faced thrust pad bearings for hydrogenerator applications [PDF]

open access: yes, 2006
There is a growing trend in the replacement of the babbit facing in thrust pad bearings with a composite polytetrafluoroethylene (PTFE) surface layer. The PTFE-faced bearings have been shown to allow a greater specific pressure, reduce thermal crowning ...
Drinkwater, B.W.   +3 more
core   +1 more source

The effect of a vegetation period on productivity, protein and oil percentage in grain of the collection soybean samples

open access: yesЗерновое хозяйство России, 2021
The purpose of the current study was to identify the effect of the length of a vegetation period of the collection soybean samples on grain productivity and quality. The study was carried out in the southern part of the Rostov region in the fields of the
A. R. Ashiev   +4 more
doaj   +1 more source

Are product spreads useful for forecasting? An empirical evaluation of the Verleger hypothesis [PDF]

open access: yes, 2013
Notwithstanding a resurgence in research on out-of-sample forecasts of the price of oil in recent years, there is one important approach to forecasting the real price of oil which has not been studied systematically to date. This approach is based on the
Baumeister, Christiane   +2 more
core   +1 more source

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