Experimental transplantation of Posidonia oceanica

peer reviewedThe project of extension at sea of Monaco required the realization of important environmental measures to protect the marine environment. Among differents actions was included a significant experimental measure of transplantation of nearly 500 m2 of Posidonia oceanica located in the project area. To reach this objective we have developed and implemented the SafeBent protocol. The SafeBent protocol allows to sample clods of seagrasses (0.8 m2/60 cm thick) with a marinized transplanter (Model Optimal 880) operated with a very long arm shovel (27 m) from a jackup. The main advantages of this method are:-high transplantation rate (up to 32 m2/jour);-conservation of the structure of the seagrasses in meadows;- conservation of the sediment;-easy transport of clods in specially manufactured metal baskets The transplantation was carried out between 20 March and 15 May 2017. Seagrasses were reimplanted in the ground of the AMP of Larvotto (384 m2) and on the berm of the dam along the port of Fontvieille in specially constructed concrete planters (116 m2). The present communication aims to present the Safebent method and the results obtained to date

Amorphous-amorphous transformation at high pressure in gallo-germanosilicate tetrahedral network glasses

International audienceWe report the existence of structurally distinct amorphous states upon compression in sodium gallo- germanosilicate glasses. In situ x-ray absorption spectroscopy provides clear evidence for a transition at high pressure to a more compact arrangement of atoms based on Ga and Ge octahedral sites. This study extends previous works on simple and open tetrahedral network

Remote determination of sample temperature by neutron resonance spectroscopy

The Doppler broadening ofthe lower energy neutron absorption resonances ofnatural hafnium, tantalum, iridium and rhenium have been studied for the purpose of measuring temperature in remote or isolated environments. Three methods for the determination of sample temperature from neutron transmission data were studied and a critical comparison ofthe efficacy ofeach method made. Fitting the observed resonance line shapes with analytical expressions incorporating instrument resolution and resonance parameters provided the most accurate measure ofsample temperature with an estimated uncertainty of 10 C at 1000 C and did not require prior calibration experiments to be performed

Hasan, Environment from the molecular level: an escience testbed project, AHM 2003

The testbed project has the ambition to push the practical possibilities of atomistic simulations forward to the point where we can perform realistic calculations on important environmental processes. The project has three components: the science driving the project, the development of the simulation codes, and setting up a grid infrastructure for this work. This paper describes these areas of work and gives a status report on each. 1