67 research outputs found
Overall survival and fungal infection-related mortality in patients with invasive fungal infection and neutropenia after myelosuppressive chemotherapy in a tertiary care centre from 1995 to 2006
Serum galactomannan index for early prediction of mortality in immunocompromised children with invasive pulmonary aspergillosis
Factors influencing mortality in abdominal solid organ transplant recipients with multidrug-resistant gram-negative bacteremia
High mortality in invasive aspergillosis: what we need to know for determination of poor prognosis and next countermeasures.
Characterization of nanocrystalline Mn-Zn ferrites obtained by mechanosynthesis
International audienc
Correlation Between the Reactivity Towards Oxygen and the Coercitivity in Submicron Vanadium Ferrite Spinels
Nanometric powders of Fe2VO4 and Fe1.84V0.92Co0.23O4 have been synthetised by "chimie douce" process. The cations in the spinel structure can oxidize at low temperatures without any phase transformation leading to cationdeficient spinel with formula Fe2VO4+δ and Fe1.84V0.92Co0.23O4+δ, where δ is the deviation from stoichiometry, due to a change of the anion-cation ratio, consecutive to formation of vacancies. The oxidation, investigated by thermogravimetry, involves several stages, each stage corresponding to the oxidation of one oxidizable cation, Fe2+, V2+, V3+ on B (octahedral) or A (tetrahedral) sites. Coercivity has also been studied, revealing that the coercive field increases with the rate of oxidation
Cation Distribution in Ferrites with Spinel Structure Measured by Anomalous Powder Diffraction
International audienc
Construction and tests of an in-beam PET-like demonstrator for hadrontherapy beam ballistic control
International audienceWe present the first results obtained with a detector, called Large Area Pixelized Detector (LAPD), dedicated to the study the ballistic control of the beam delivered to the patient by in-beam and real time detection of secondary particles, emitted during its irradiation in the context of hadrontherapy. These particles are 511 keV γ from the annihilation of a positron issued from the β+ emitters induced in the patient tissues along the beam path. The LAPD basic concepts are similar to a conventional PET camera. The 511 keV γ are detected and the reconstructed lines of response allow to measure the β+ activity distribution. Nevertheless, when trying to use γ from positron annihilation for the ballistic control in hadrontherapy, the large prompt γ background should be taken into account and properly rejected. First reconstruction results, obtained with a phantom filled with a high intensity FDG source at the cancer research centre of Clermont-Ferrand are shown. We also report results of measurements performed at the Heidelberg Ion-Beam Therapy Centre with one third of the detector, using proton and carbon ion beams
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