A new method to fabricate the trans-scale structure of the micro-scale bowl and the nano-scale carbon nanotube (CNT) forest is presented. The new method mimics the natural structure of a superhydrophobic surface like a lotus leaf. The robust silicon microstructure (Si microbowl) and the subsequent CVD growth of CNT have successfully combined the nanoscale CNT forest on the Si microbowl for enha...

Superconducting electronics play an important role in quantum computation, ultra-low-power electronics, voltage standards and magnetic sensors. Many of these applications rely on the microfabrication of superconducting circuits with multiple wiring layers and a range of active elements. The performance of these superconducting circuits are directly related to the three-dimensional microstructur...

Regularities of the phase protective layer formation in multicomponent systems involving inhibitors with different mechanism of protective action have been investigated. It was shown that optimization of the composition of the inhibition mixture allows to obtain higher protective efficiency owing to improved microstructure of the phase layer. It was found that mechanism of the film formation in...

Within the scope of increase in cutting tools efficiency, a CW CO;! laser beam has been used for butt welding sintered tips containing cobalt and tungsten carbide to a medium carbon steel core. After optimization of the laser processing conditions, full penetrating, sound and homogeneous welds are observed. Hardness is found to be nearly constant across the entire weld bead cross-section. Micro...

Monolithic nanoporous copper was synthesized by dealloying Mn0.7Cu0.3 by two distinct methods: potentiostatically driven dealloying and free corrosion. Both the ligament size and morphology were found to be highly dependent on the dealloying methods and conditions. For example, ligaments from 16 nm–125 nm were obtained by dealloying either electrochemically or by free corrosion, respectively. O...

Recent progress in three di€erent areas involving the modeling of the physical properties of composites is reviewed. These include: (i) theoretical approaches to microstructure/property relations; (ii) X-ray microtomography, an imaging technique that enables one to obtain high-resolution three-dimensional microstructural phase information of a composite sample in a non-intrusive manner; and (ii...

This paper addresses the numerical approximation of Young measures appearing as generalized solutions to scalar nonconvex variational problems. We prove a priori and a posteriori error estimates for a macroscopic quantity, the stress. For a scalar three-well problem we show convergence of other quantities such as Young measure support and microstructure region. Numerical experiments indicate th...

the study of nucleation mechanism of new grains during severe plastic deformation of magnesium alloys is of great importance to control the characteristics of final microstructures.  to investigate the role of discontinuous recrystallization, a wrought az31 magnesium alloy was deformed by accumulative back extrusion process at 330 °c.  the obtained microstructures were studied using optical and...

An uncertainty-oriented cross-scale topology optimization model with global stress reliability constraint, local displacement and micro-manufacturing control based on evidence theory is presented. The oriented to two-dimensional porous material structure, which concurrently designs the distribution of both macrostructure cell microstructure. During process, homogenization method used solve equi...

Underwater acoustic stealth has great scientific research value. According to coordinate transformation theory, the cloak based on pentamode materials can realize underwater broadband stealth. However, due correlation between density and modulus of changes in parameters each layer cloak, a large amount structural optimization work is required for material meet specific parameter requirements, w...