Characterization of refractory titanium alloys welded by TIG and laser processes

The use of refractory titanium alloys for the components of structure subjected to increasing temperatures is in full expansion in the air transport. Within the framework of European project HORTIA, aiming to develop and design a conduit of refractory titanium alloy helicopter by associating innovative processes and the industrial constraints, this work relates to the implementation and characterization of Ti6242 and Beta-21 S welded sheets by TIG and C02 laser processes. The determination of the mechanical characteristics in connection with the metallurgical transformations relating to the Ti6242/Ti6242, Beta 2IS /Beta 2lS and Ti6242/Beta2lS assembly configurations allowed a rigorous comparison of the processes and studied materials. The influence of the heat treatment 600°C/8h on the relations structures/mechanical properties was also studied in order to envisage the behaviour of the assemblies under the real service use conditions

Search for dark matter produced in association with bottom or top quarks in √s = 13 TeV pp collisions with the ATLAS detector

A search for weakly interacting massive particle dark matter produced in association with bottom or top quarks is presented. Final states containing third-generation quarks and miss- ing transverse momentum are considered. The analysis uses 36.1 fb−1 of proton–proton collision data recorded by the ATLAS experiment at √s = 13 TeV in 2015 and 2016. No significant excess of events above the estimated backgrounds is observed. The results are in- terpreted in the framework of simplified models of spin-0 dark-matter mediators. For colour- neutral spin-0 mediators produced in association with top quarks and decaying into a pair of dark-matter particles, mediator masses below 50 GeV are excluded assuming a dark-matter candidate mass of 1 GeV and unitary couplings. For scalar and pseudoscalar mediators produced in association with bottom quarks, the search sets limits on the production cross- section of 300 times the predicted rate for mediators with masses between 10 and 50 GeV and assuming a dark-matter mass of 1 GeV and unitary coupling. Constraints on colour- charged scalar simplified models are also presented. Assuming a dark-matter particle mass of 35 GeV, mediator particles with mass below 1.1 TeV are excluded for couplings yielding a dark-matter relic density consistent with measurements

Mise en oeuvre et caractérisation d'assemblages soudés par procédés TIG et laser de tôles d'alliages de titane réfractaires

L'utilisation des alliages de titane réfractaires pour les composants de structure soumis à des températures croissantes est en pleine expansion dans le secteur aéronautique. Dans le cadre du projet européen HORTIA, visant à développer et concevoir une tuyère d'hélicoptère en alliages de titane réfractaires en associant des procédés novateurs et les contraintes industrielles, ce travail concerne la mise en oeuvre et la caractérisation de tôles en alliages Ti6242 et b21S soudés par procédé TIG et laser CO2. La détermination des caractéristiques mécaniques en liaison avec les transformations métallurgiques relatives aux configurations d'assemblage Ti6242/Ti6242, b21S/b21S et Ti6242/b21S a permis une comparaison rigoureuse des procédés et des matériaux étudiés. L'influence du traitement thermique 600C/8h sur les relations structures/propriétés mécaniques a également été étudiée afin de prévoir le comportement des assemblages dans les conditions réelles d'emploi.The use of refractory titanium alloys for the components of structure subjected to increasing temperatures is in full expansion in the air transport. Within the framework of European project HORTIA, aiming to develop and design a conduit of refractory titanium alloy helicopter by associating innovative processes and the industrial constraints, this work relates to the implementation and characterization of Ti6242 and Beta-21S welded sheets by TIG and CO2 laser processes. The determination of the mechanical characteristics in connection with the metallurgical transformations relating to the Ti6242/Ti6242, Beta21S/Beta21S and Ti6242/Beta21S assembly configurations allowed a rigorous comparison of the processes and studied materials. The influence of the heat treatment 600C/8h on the relations structures/mechanical properties was also studied in order to envisage the behaviour of the assemblies under the real service use conditions.TOULOUSE-ENSEEIHT (315552331) / SudocTARBES-ENIT (654402301) / SudocSudocFranceF

Considérations sur la chirurgie actuelle du septum nasal

Thèse : Médecine : Université de Bordeaux : 1908N° d'ordre : 8

[correspondence] Brief aan Ferdinand Vander Haeghen te Gent.

Record 000033740 versmolten met record 000056909

[correspondence] Brief aan Ferdinand Vander Haeghen te Gent.

Record 000033663 versmolten met record 000056823

[correspondence] Brief aan Ferdinand Vander Haeghen te Gent.

Record 000033685 versmolten met record 000056845

[correspondence] Brief aan Ferdinand Vander Haeghen te Gent.

Record 000033749 versmolten met record 000056918