Sintering and properties of ZrO[2](Mg)-MgO composites

These studies shows which structures and properties have composites based on ZrO[2](Mg)-MgO sintered in a wide temperature range from 1400to 1650{о}С. X-ray diffraction showed an increasing of crystalline size with increasing of magnesia concentration. Decreasing of sintering temperature accompanied with an increasing of porosity and reduction of the compressive strength. Scanning electron microscopy showed the morphology of the composite structure. It is discovered that the pore size in the zirconia matrix in an order of magnitude higher than in magnesia inclusions

Mixed oxides NiO/ZnO/Al2O3 synthesized in a single step via ultrasonic spray pyrolysis (USP) method

Mixed oxides have received remarkable attention due to the many opportunities to adjust their interesting structural, electrical, catalytic properties, leading to a better, more useful performance compared to the basic metal oxides. In this study, mixed oxides NiO/ZnO/Al2O3 were synthesized in a single step via the ultrasonic spray pyrolysis method using nitrate salts, and the temperature effects of the process were investigated (400, 600, 800 \ub0C). The synthesized samples were characterized by means of scanning electron microscopy, energy-dispersive spectroscopy, X-ray diffraction and Raman spectroscopy analyses. The results showed Al2O3, NiO–Al2O3 and ZnO–Al2O3 systems with spinel phases. Furthermore, the Raman peaks supported the coexistence of oxide phases, which strongly impact the overall properties of nanocomposite

One step production of silver-copper (Agcu) nanoparticles

AgCu nanoparticles were prepared through hydrogen-reduction-assisted Ultrasonic Spray Pyrolysis (USP) and the Hydrogen Reduction (HR) method. The changes in the morphology and crystal structure of nanoparticles were studied using different concentrated precursors. The structure and morphology of the mixed crystalline particles were characterized through X-ray diffraction analysis (XRD), scanning electron microscopy (FEG-SEM), transmission electron microscopy (TEM) and Energy-dispersive X-ray spectroscopy (EDS). The average particle size decreased from 364 nm to 224 nm by reducing the initial solution concentration from 0.05 M to 0.4 M. These results indicate that the increase in concentration also increases the grain size. Antibacterial properties of nanoparticles against Escherichia coli were investigated. The obtained results indicate that produced particles show antibacterial activity (100%). The AgCu nanoparticles have the usage potential in different areas of the industry

Исследование резонансных взаимодействий в многоатомных молекулах на примере 12C13CH4

В работе выполнен анализ спектра высокого разрешения молекулы 12C13CH4 в районе "запрещённой" полосы ?8+?10. Линии данной полосы проявляются в спектре только из-за сильного резонансного взаимодействия с несколькими "разрешёнными" полосами.The high-resolution spectra of the 12C13CH4 molecule have been analyzed in the region, where located the "forbidden" band ?8+?10. This band appears in absorption spectrum only on account of resonance interactions with "allowed" bands