73,799 research outputs found
Education and Training in St. Vincent and the Grenadines: A Partially Annotated Bibliography
No full textThis bibliography on “Education and Training in St. Vincent and the Grenadines” has been specifically prepared for the UWI School of Continuing Studies’ St. Vincent and the Grenadines Conference. It covers all aspects of education and training in St. Vincent and the Grenadines including: Academic achievement,economics of education, educational infrastructure, literacy and mathematics education
Catalogue des livres de Vincent, imprimeur-libraire à Paris, rue & vis-à-vis S. Severin, à l'Ange. 1757
No full text[Catalogue de libraire. Paris. Vincent, Philippe. 1757]Avec mode text
Temperature effect on foam coreflood experiments
No full textGas flooding is a widely used improved and enhanced oil recovery method. However, due to the low density and the high mobility of gas compared to oil and water, gravity override and fingering of gas though high-permeability zoness can occur during gas flooding reducing oil recovery. The development of foam leads to lowering the gas mobility and thus can help overcome the above disadvantages and improve the reservoir sweep efficiency and the oil recovery as well. Many experimental and modelling studies have been devoted to accurately describe foam in the last decade, but questions remain about foam performance at elevated temperatures. Although the surface activity of surfactants as a function of temperature is well described at the liquid/liquid or liquid/ gas interface, the description of the effect of temperature at foam behavior is limited, especially in porous media. In this work, we tested a N2 foam with AOS surfactant at four different temperatures (20°C, 40°C, 60°C and 80°C) and three different sandstone rocks with different permeability range (Bentheimer, Berea and Bandera) under co-injection conditions. The pressure drop, or equivalently the apparent viscosity, was measured in steady-state experiments. Conducting these core-flood experiments we concluded that the apparent viscosity of foam was reduced as temperature increased. Also, the mobility reduction factor was lower for the lower permeability sandstones. Furthermore even if superficial velocity was constant throughout the experiments (since total flow rate was kept constant) we observed an increasing trend of the velocity values because of the increase in the flow rate of gas as temperature increased. This was a result of the applied correction factors on the gas flow during the experiments. From the above we would assume that the increase in velocity was also contributed on the decrease of apparent viscosity apart from the change of the surface-tension for different temperatures. By normalizing apparent viscosity with respect to velocity we calculate the capillary number. We observed that all experimental data collapse on a single curve of capillary number: this suggests that the reduction of surface-tension was responsible for the drop in apparent viscosity at elevated temperatures. As a second part of this study, foam flow in the porous medium was simulated by a mobility-reduction model. For the purpose of this work only Local Equilibrium models were described and used and especially STARS model which scaled down the gas mobility based on empirical parameters. We managed to obtain the five foam flow-parameters used in the STARS model as well as to fit the data from the constant-velocity foam-scan core-flood experiments with two different methods (Boeije and modified Ma et al.). Finally, testing the capability of the current empirical models on the effect of temperature we concluded that it cannot sufficiently account for the effect of temperature or surface-tension.Petroleum EngineeringGeoscience & EngineeringCivil Engineering and Geoscience
Título: Adolescentia, seu Bucolica
No full textMarca de Antonio Vincent en portLos impresores constan en colofónSign. : *\b2-8\s, a-k\p8\s, l\p4\sApostillas marginale
Essai Sur La Maniere De Perfectionner L'Espece Humaine / Par M. Vandermonde, Docteur-Régent de la Faculté de Médecine de Paris
No full textVorlageform der Veröffentlichungsangabe: A Paris, Chez Vincent, Imprimeur-Libraire, rue S. Severin, à l'Ang
Essai Sur La Maniere De Perfectionner L'Espece Humaine
No full textFingerprint nach Ex. der FB Gotha und der ULB Sachsen-AnhaltVorlageform des Erscheinungsvermerks: A Paris, Chez Vincent, Imprimeur-Libraire, rue S. Severin, à l'Ange. M. DCC LV
Catalogue des livres qui se trouvent chez Vincent, imprimeur-libraire de monseigneur le duc de Bourgogne, à Paris, rue & vis-à-vis S. Severin 1759
No full text[Catalogue de libraire. Paris. Vincent, Philippe. 1759]Avec mode text
Catalogue des livres qui se trouvent chez Vincent, imprimeur-libraire de monseigneur le comte de Provence, à Paris, rue & vis-à-vis S. Severin. 1763
No full text[Catalogue de libraire. Paris. Vincent, Philippe. 1763]Avec mode text
Catalogue des livres qui se trouvent chez Vincent, imprimeur-libraire de monseigneur le duc de Bourgogne, à Paris, rue & vis-à-vis S. Severin. 1760
No full text[Catalogue de libraire. Paris. Vincent, Philippe. 1760]Avec mode text
Título: In vitas patrum percelebre opus oculos mortalibus celumque aperiens
No full textEl pie de imp. consta en colofón en r. de h. CLXIIIIMarca tip. de Simon Vincent en v. de h. CLXIIIIA\p6\s, a-t\p8\s, v\p4\s, x\p8\sTexto a dos colLetra gótPort. xil. arquitectónica y a dos tintasGrab. xil. intercalados en el textoSequitur opusculum ... de virtutum laude et effectu, comienza en r. de h. CLVII
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