Abstract: A detection unit for a gas sensor, having at least one gas-sensitive element (1) including at least one gas-sensitive material, the optical properties of which vary as a function of the contact with a target gas. The detection unit is configured for arrangement on a mobile evaluation unit (5) having an image acquisition unit (6), in order to form a gas sensor, and the detection unit has at least one optical lens (2), and the gas-sensitive element (1) and the optical lens (2) are arranged in such a way that the ambient light (U) that passes through the gas-sensitive element (1) can be imaged by the optical lens (2), in particular can be imaged onto the image acquisition unit (6) when the detection unit is arranged on the mobile evaluation unit (5).

Abstract: According to a thermomechanical treatment process for a titanium alloy including between 23 and 27% niobium in atomic proportion, between 0 and 10% zirconium, and between 0 and 1% oxygen, nitrogen and/or silicon, the following steps are performed: a) an increase of a sample of the alloy to a temperature higher than 900° C., b) a fast quench, c) a severe cold strain, d) an ageing treatment at a temperature included between 200 and 600° C., the time of the ageing treatment being included between 10 seconds and 10 minutes. Alloy obtained by this process and prostheses made from such an alloy.

Abstract: According to a thermomechanical treatment process for a titanium alloy including between 23 and 27% niobium in atomic proportion, between 0 and 10% zirconium, and between 0 and 1% oxygen, nitrogen and/or silicon, the following steps are performed: a) an increase of a sample of the alloy to a temperature higher than 900° C., b) a fast quench, c) a severe cold strain, d) an ageing treatment at a temperature included between 200 and 600° C., the time of the ageing treatment being included between 10 seconds and 10 minutes. Alloy obtained by this process and prostheses made from such an alloy.