From foreign to national: a review of the status of the French language in Gabon
This article provides a review of the various statuses of the French language in Gabon, a French-speaking country in Central Africa. It reveals a process in which different generations of Gabonese people are increasingly learning, and thus conceptualising, French as a second language rather than a foreign language. Furthermore, some are also learning and conceptualising French as a mother tongue or initial language, rather than a second language. This process of reconceptualisation has somehow been encouraged by the language policy of the colonial administration and the language policy since the attainment of independence, the latter being a continuation of the former. The final stage of this process is that the language has been adopted among the local languages within the Gabonese language landscape.
Regard critique sur On Est Ensemble: 852 mots pour comprendre le français du Gabon
A Critical Look at On Est Ensemble: 852 mots pour comprendre le francais du Gabon. The book On Est Ensemble: 852 mots pour comprendre le francais du Gabon (L. Ditougou, 2009) is an important contribution to the history of French spoken in Gabon. However, this work presents some shortcomings from a metalexicographic point of view. These relate to the front matter text, the central list (the macrostructure, the microstructure, the access structure, the addressing structure and the mediostructure) and the back matter text. This article aims to address these shortcomings, and, at the same time, to propose ways that could help improve them.
Evaluation of CuAl2O4 as an Oxygen Carrier in Chemical-Looping Combustion
The chemical-looping combustion (CLC) process is a novel solution for efficient combustion with intrinsic separation of carbon dioxide. The process uses a metal oxide as an oxygen carrier to transfer oxygen from an air to a fuel reactor where the fuel, or gasification products of the fuel, reacts with the solid oxygen carrier. In this work, copper(II) aluminate (CuAl2O4) was assessed as a potential oxygen carrier using methane as fuel. The carrier particles were produced by freeze–granulation and calcined at 1050 °C for a duration of 6 h. The chemical-looping characteristics were evaluated in a laboratory-scale fluidized-bed reactor in the temperature range of 900–950 °C during 45 alternating redox cycles. The oxygen carrier exhibited reproducible and stable reactivity behavior in this temperature range. Neither agglomeration nor defluidization was noticed in any of the cycles carried out at 900–925 °C. However, after reactivity tests at 950 °C, soft agglomeration and particle fragmentation were observed. Systematic phase analysis of the Cu–Al–O system during the redox cycle was carried out as a function of duration of reduction and oxygen concentration during the oxidation period. It was found that the CuAl2O4 is reduced to copper(I) aluminate (CuAlO2; delafossite), Cu2O, and elemental Cu. The CuAlO2 phase is characterized by slow kinetics for oxidation into CuO and CuAl2O4. Despite this kinetic limitation, complete conversion of methane with reproducible reactivity of the oxygen carrier is achieved. Thus, CuAl2O4 could be a potential oxygen carrier for chemical-looping combustion.