Search results for " Total"
showing 10 items of 385 documents
Contribution of fly ash and TSP to the formation of decay layers on building materials in urban environments of Sicily (Italy)
2009
Analysis of Caffeine, Sweeteners, and Other Additives in Beverages by Vibrational Spectroscopy
2001
This chapter presents a review of the scientific literature on the use of vibrational spectroscopy, near-infrared (NIR), mid-infrared (mid-IR), and Raman, for the analysis of caffeine, sweeteners, and other additives in beverages and related products. Direct analysis procedures of coffee and tea, for both classification according to precedence or variety and quantitative determination of caffeine, are available. For beverage analysis, caffeine has been determined by direct attenuated total reflection (ATR) measurement or by transmission spectroscopy in the mid-IR region after extraction with chloroform. Different strategies have been employed for the analysis of sweeteners in beverages and …
Plume composition and volatile flux of Nyamulagira volcano, Democratic Republic of Congo, during birth and evolution of the lava lake, 2014-2015
2017
Very little is known about the volatile element makeup of the gaseous emissions of Nyamulagira volcano. This paper tries to fill this gap by reporting the first gas composition measurements of Nyamulagira’s volcanic plume since the onset of its lava lake activity at the end of 2014. Two field surveys were carried out on 1 November 2014, and 13–15 October 2015. We applied a broad toolbox of volcanic gas composition measurement techniques in order to geochemically characterize Nyamulagira’s plume. Nyamulagira is a significant emitter of SO2, and our measurements confirm this, as we recorded SO2 emissions of up to ~ 14 kt/d during the studied period. In contrast to neighbouring Nyiragongo volc…
Compte rendu de : Jenny Raflik, Terrorisme et mondialisation. Approches historiques, Paris, Gallimard, 2016, 416 p.
2018
International audience
Highly Active Co3O4-Based Catalysts for Total Oxidation of Light C1–C3 Alkanes Prepared by a Simple Soft Chemistry Method: Effect of the Heat-T…
2021
9 figures, 2 tables.
Investigation about selective harmonic elimination in unbalanced multilevel inverters
2022
In this paper 5 and 7 levels cascaded H-bridges inverters are considered, feeding by unequal dc voltage sources. The effect of these unbalancing operation is examined concerning harmonic analysis and total harmonic distortion of the output voltages. The system of equations, obtained by the expansion in the Fourier series of phase output voltage, is solved by applying a method of graphic solution that allows obtaining the switching angles able to eliminate the lower order harmonics.
La radicalidad del mal banal
2002
El concepto de ‘banalidad del mal’ fue introducido por Hannah Arendt a fin de caracterizar una forma inédita de perversidad que ella vio encarnada en Adolf Eichmann y otros criminales nazis. Arendt consideraba que esa forma de perversidad estaba muy alejada de la noción de ‘mal radical’ que Kant había acuñado y la propia Arendt había empleado en trabajos anteriores. El objetivo principal del artículo es mostrar que hay más afinidades entre el mal radical kantiano y la banalidad del mal de lo que la propia Arendt reconoce. ‘Banality of evil’ was a concept introduced by Hannah Arendt in order to characterize a new form of wickedness embodied in people as Adolf Eichmann and others nazis crimin…
Stima della disponibilità a pagare per la salvaguardia di un'area protetta siciliana dagli incendi boschivi
2009
Forest fires are a major concern in the Mediterranean regions and decision-makers devote large financial resources of the overall public forestry expenditure to their management. The research aims to provide an empirical contribution to the knowledge about the economic benefits deriving from fire protection of forest ecosystems. A case study is presented where we measured the TEV of reducing fire hazards to a cork-oak forest localised in a Sicilian protected area, using a dichotomous choice question in a Contingent Valuation Study. The magnitudes of the annual aggregate WTP estimates obtained range from € 32,745 to € 42,953, corrispondent to € 712 and € 934 per hectare, in order to protect …
Surface Morphology of Single and Multi-Layer Silicon Nitride Dielectric Nano-Coatings on Silicon Dioxide and Polycrystalline Silicon
2019
Silicon nitride (Si3N4) in a form of single and multi-layer nanofilms is proposed to be used as a dielectric layer in nanocapacitors for operation in harsh environmental conditions. Characterization of surface morphology, roughness and chemical bonds of the Si3N4 coatings has an important role in production process as the surface morphology affects the contact surface with other components of the produced device. Si3N4 was synthesized by using low pressure chemical vapour deposition method and depositing single and multi-layer (3 – 5 layers) nanofilms on SiO2 and polycrystalline silicon (PolySi). The total thickness of the synthesized nanofilms was 20 – 60 nm. Surface morphology was investi…
Antioxidant Potential of Extracts Obtained from Macro- (Ascophyllum nodosum, Fucus vesiculosus and Bifurcaria bifurcata) and Micro-Algae (Chlorella v…
2018
Background: Natural antioxidants, which can replace synthetic ones due to their potential implications for health problems in children, have gained significant popularity. Therefore, the antioxidant potential of extracts obtained from three brown macroalgae (Ascophyllum nodosum, Fucus vesiculosus and Bifurcaria bifurcata) and two microalgae (Chlorella vulgaris and Spirulina platensis) using ultrasound-extraction as an innovative and green approach was evaluated. Methods: Algal extracts were obtained by ultrasound-assisted extraction using water/ethanol (50:50, v:v) as the extraction solvent. The different extracts were compared based on their antioxidant potential, measuring the extraction …