in this study, friction stir spot welding (fssw) is applied to join the tial6v4 titanium alloy with 1.5 mm thickness and then the effect of rotational speed and tool dwell time on microstructure and mechanical properties is investigated. in this regard, the speed of the tool rotation was considered as 800, 1000, and 1200 rpm, as well as the tool dwell time was set at 7 and 12s. microstructural ...

The surface properties of alloys can be improved by coating their surfaces and adding a micro-texture. effect on the alloy composite coatings textured has not been addressed in previous studies. In this study, micro-texture was added to WC+Co AlCrN/AlTiSiN coating. influence micro-texture’s geometric parameters its lifespan were studied detail. First, hardness phases various micro-textured anal...

statement of problem: one of the factors in dental erosion is consumption of acidic soft drinks. although the effects of various additives to acidic soft drinks for the prevention of tooth erosion have been assessed, little data have been published on the possibility of preventing the erosion through soft drinks containing calcium-carbonate nanoparticles.  objectives: to examine the erosive fac...

* Supported by the National Natural Science Foundation of China(No. 60305008 ) Abstract This paper proposes a new method for motion planning global optimization of a macro-micro manipulator (3M) system based on Estimation of Distribution Algorithm (EDA). Due to the redundant character of a 3M system, its motion planning is formulated as a multi-objective optimization problem under the mechanica...