In situ carbonation of peridotite for CO2 storage

The rate of natural carbonation of tectonically exposed mantle peridotite during weathering and low-temperature alteration can be enhanced to develop a significant sink for atmospheric CO2. Natural carbonation of peridotite in the Samail ophiolite, an uplifted slice of oceanic crust and upper mantle in the Sultanate of Oman, is surprisingly rapid. Carbonate veins in mantle peridotite in Oman have an average 14C age of ≈26,000 years, and are not 30–95 million years old as previously believed. These data and reconnaissance mapping show that ≈104 to 105 tons per year of atmospheric CO2 are converted to solid carbonate minerals via peridotite weathering in Oman. Peridotite carbonation can be accelerated via drilling, hydraulic fracture, input of purified CO2 at elevated pressure, and, in particular, increased temperature at depth. After an initial heating step, CO2 pumped at 25 or 30 °C can be heated by exothermic carbonation reactions that sustain high temperature and rapid reaction rates at depth with little expenditure of energy. In situ carbonation of peridotite could consume >1 billion tons of CO2 per year in Oman alone, affording a low-cost, safe, and permanent method to capture and store atmospheric CO2

La Sardegna, unica zona di approvvigionamento in ossidiana per la Corsica durante il Neolitico ? Il caso del sito neolitico medio-finale di A Fuata (NW della Corsica)

International audienc

La Sardegna, unica zona di approvvigionamento in ossidiana per la Corsica durante il Neolitico ? Il caso del sito neolitico medio-finale di A Fuata (NW della Corsica)

International audienc

How Bourdieu bites back: recognising misrecognition in education and educational research

Having noted that some use of Bourdieusian concepts in educational research is superficial, this paper offers a view of the distinctiveness of Bourdieu’s concepts via the example of misrecognition, which is differentiated from the concept with the same name in Fraser’s work. An account is given of a recent research project on white middle-class identity and school choice, which suggests that whilst parents avoided a common misrecognition (regarding school quality), they were nevertheless reliant on other forms of misrecognition (regarding the qualities of their children) that are equally important in the relationship between social class and educational inequalities. Finally, the paper suggests that educational understandings, including some educational research, are predisposed to misrecognise Bourdieusian concepts, and four areas of tension are identified. The paper argues against ‘light usage’ of Bourdieu whilst acknowledging that the approach can produce a pessimistic account that is at odds with some educational values

Status of the ESS elliptical cryomodules at CEA saclay

The first ESS prototype cryomodule with medium beta cavities named M-ECCTD is being assembled at CEA Saclay. The Q curves of the 4 cavities mounted inside the cryomodule are presented, and the four power couplers have been conditioned at high power before their assembly onto the cavity string. Completion of the M-ECCTD assembly outside clean room is in progress as well as the finalization of the RF power test stand preparation. RF power tests of the M-ECCTD will be performed during summer 2017. CEA is preparing the production of the ESS medium and high beta cryomodules of the series before the test of the M-ECCTD and the contracts for the procurement of the most critical components have already been signed

Status of the ESS Elliptical Cryomodules at CEA Saclay

International audienceThe first ESS prototype cryomodule with medium beta cavities named M-ECCTD is being assembled at CEA Saclay. The Q curves of the 4 cavities mounted inside the cryomodule are presented, and the four power couplers have been conditioned at high power before their assembly onto the cavity string. Completion of the M-ECCTD assembly outside clean room is in progress as well as the finalization of the RF power test stand preparation. RF power tests of the M-ECCTD will be performed during summer 2017. CEA is preparing the production of the ESS medium and high beta cryomodules of the series before the test of the M-ECCTD and the contracts for the procurement of the most critical components have already been signe