In this paper, the analysis of the influence of nano-sized defects on the critical current phenomena in the multilayered HTc superconductors is presented. The formation of the pinning potential barrier, determining the superconducting transport current flow, current-voltage characteristics, shapes and critical current limitations are discussed. Various initial positions of pancake vortices in the respect to […]

Development of nanostructured coatings play a crucial role in surface engineering for energy harvesting applications. Thermal characterization methods are one of the most accessible tools to study, model and predict the process parameters required to control nanostructure development during thermal treatment of different novel multi-material coating systems. Differential scanning calorimetry (DSC) is often used as […]

Development of the amorphous granules of metals is one of the perspective directions connected with a production of the new (including nanostructured) functionally unique materials. The methods and devices for production the spherical granules (particles) of metals of a given size, with a high cooling a rate by solidification, are presented. The cooling rate of […]

Modern nuclear fuels exploit the unique features of nano-structures. With proper engineering of fuel micro-nano-structure, fission products can, in principle, be separated from the fuel in-situ, and further be separated by the transmutation products. Fuel entities which are about 10 to 30 microns in diameter can contain the fuel ions in the particles while allowing […]

The purpose of this paper is to introduce the hydrogen redox electric power (HREG) and hydrogen generation systems (HRHG). The HREG offers considerable conceptual advantage such that it functions with zero energy input, zero matter input and zero emission without violating the laws of thermodynamics. Its application ranges from the large scale central-station power generation […]

The nitrogen and fluorine co-doped carbon catalyst (C-Mela-PTFE) exhibits high performance for oxygen reduction. However, the mechanism is remained elusive. Here, we investigate the structure and oxygen chemisorption processes of C-Mela-PTFE by experimental and theoretical methods. The results show that the C-Mela-PTFE materials exhibit layered porous structure, which facilitates the diffusion of oxygen. Compare N-doped […]

To investigate the influence of support material type on the performance of doped carbon catalysts, electrochemical catalysts of doped carbon were prepared by pyrolyzing polyaniline (PANI), using melamine, XC-72R and TiO2 as support material, respectively. For the oxygen reduction reaction (ORR), support material had a significant effect on the performance of catalysts due to their […]

Lithium niobate (LiNbO3) nano and micro structures are deposited using spin coating method on quartz substrate. The precursor solutions are prepared under different time of stirring (8, 24 and 48h). The precursors are deposited by spin coating at 3000 rpm for 30sec and 0.5 mol/L. The samples are analysed by X-ray diffraction. The results show […]

The effect of various promoters (Ca, Ce, Mg, Zr) on the performance of 3%Ni/g-Al2O3 catalysts in dry reforming of methane was investigated in a quartz tubular reactor under the following conditions: 1:1 CO2/CH4 ratio, flow rate CO2/CH4/Ar = 15/15/3 ml/min, temperature 700oC and at atmospheric pressure. The support,g-Al2O3 was prepared by hydrothermal crystallization of boehmite. […]

Commercially pure titanium (CP-Ti) TA2 samples were subjected to thermal oxidation (TO) treatment at a temperature range of 500℃~850℃ for 210min. The oxidizing kinetics was analyzed, and the TO treated specimens were characterized by scanning electron microscopy (SEM), X-ray diffractometer (XRD), microhardness tester and immersion test. The results showed that the TO kinetics curves at […]