-Oxygen isotope composition of three types of unique nodules which consist of amorphous silica-apatite, cristobalite-apatite and tridymite-apatite associations interspersed amidst basaltic pyroclastics from the Hat Peres volcano, Golan Heights, Israel is reported. Unusual isotopic temperature (75~ estimated from oxygen isotope fractionation between cristobalite (6'80 = +25.5%0-apatite (6'80 = +...

OBJECTIVES The aim of this study was to assess personal exposure to fibres, crystalline silica, silicon carbide (SiC) and sulphur dioxide in the Norwegian SiC industry. METHODS Approximately 720 fibre samples, 720 respirable dust samples and 1400 total dust samples were collected from randomly chosen workers from the furnace, processing and maintenance departments in all three Norwegian SiC p...

Department of Earth Sciences, Durham University, South Road, Durham DH1 3LE, UK, Institute of Hazard, Risk and Resilience, Durham University, South Road, Durham DH1 3LE, UK, Department of Earth and Environmental Sciences, Ludwig-Maximilians-Universität München, Munich 80333, Germany, Camborne School of Mines, College of Engineering, Mathematics and Physical Sciences, University of Exeter, Penry...

STUDY. H. Chennaoui Aoudjehane, A. Jambon and O. Boudouma, Université Hassan II Aïn Chock, Faculté des Sciences, Equipe Géoressources, BP 5366 Maârif Casablanca Morocco (e-mail : [email protected]), Université Pierre et Marie Curie-Paris6 Laboratoire MAGIE, Case 110, 4 place Jussieu, 75252 Paris, France (email: [email protected]), Université Pierre et Marie Curie-Paris6 Service de micros...

We have studied the geometries, formation energies, migration barriers and diffusion of a copper interstitial with different charge states with and without an external electric field in the α-cristobalite crystalline form of SiO2 using ab initio computer simulation. The most stable state almost throughout the band gap is charge q = +1. The height of the migration barrier depends slightly on the...