To fulfill the need of studying the deuterium retention in nuclear materials, the authors set up an NRA to analyze device with three channel detecting system based on 4.5 MV electrostatic accelerator in Peking University, and developed a multi-energies NRA method for quantitative depth profiling deuterium. With the simultaneous energy spectra of p and 4He created by the D (3He, p) 4He nuclear reaction, by adopting several different incident 3He+ energies (0.8?3.6 MeV), a reasonable better depth resolution and higher sensitivity in a larger analyzing depth could be obtained. The authors also measured differential cross-section of the 3He-D reaction at 135°. The relative accuracy of these data was better than ±3.9%. The initial measurement of concentration and depth profiles of D was carried out, using targets of implanted PC-W samples, as well as CMSIIW samples from a W-coated outer divertor tile of TOKAMAK AUG near the strike points. A ~6 μm analyzed depth could be obtained with a depth resolution less than 1.5 μm throughout the whole detecting range and a ~20 nm minimal resolution at the sample surfaces. The detection limit was around 5×1019 D/m2. Apart from the statistical and fitting error of NRA spectra, the NRA system had an experimental error of ±7.5% from the parameter measurement.
Recent developments in modeling of clearance joints and dynamics of mechanical systems with clearances are reviewed. Different modeling approaches for clearance joints are summarized firstly, which comprise the massless link approach, the non-smooth dynamics approach, the contact force approach and the 3D revolute joint approach. Then, applications of these approaches in the study of the nonlinear dynamics, and performance and reliability evaluation of the mechanical systems with clearances are systematically reviewed. Finally, the key problems and priorities which need to be further studied are proposed, including the modeling of clearace joints considering stick-slip phenomenon, contact surface profile and conformal contact condition, the dynamic analysis and kinematic accuracy evaluation of mechanical systems with both clearances and uncertainties, and the design for clearance joints.