Optically Active Defects Induced by 10 MeV Electron Beam in Transparent MgAl2O4 Ceramics

In the synthesized MgAl2O4 ceramics, Raman scattering modes were detected due to the presence of random distribution of cations over structural positions (structural reversal effects). Irradiation by 10 MeV electron beam caused intensity redistribution of the fundamental bands in Raman spectrum. New optical absorption bands were registered. Observed features were attributed to the effect of radiation-induced ‘ionic mixing’ in cation sublattice. This effect is the formation of additional [Al

Self-tuning Personalized Information Retrieval in an Ontology-Based Framework

Reliability is a well-known concern in the field of personalization technologies. We propose the extension of an ontology-based retrieval system with semantic-based personalization techniques, upon which automatic mechanisms are devised that dynamically gauge the degree of personalization, so as to benefit from adaptivity but yet reduce the risk of obtrusiveness and loss of user control. On the basis of a common domain ontology KB, the personalization framework represents, captures and exploits user preferences to bias search results towards personal user interests. Upon this, the intensity of personalization is automatically increased or decreased according to an assessment of the imprecision contained in user requests and system responses before personalization is applied

Charm production nearby threshold in pA-interactions at 70 GeV

The results of the SERP-E-184 experiment at the U-70 accelerator (IHEP, Protvino) are presented. Interactions of the 70 GeV proton beam with C, Si and Pb targets were studied to detect decays of charmed $D^0$, $\overline D^0$, $D^+$, $D^-$ mesons and $\Lambda _c^+$ baryon near their production threshold. Measurements of lifetimes and masses are shown a good agreement with PDG data. The inclusive cross sections of charm production and their A-dependencies were obtained. The yields of these particles are compared with the theoretical predictions and the data of other experiments. The measured cross section of the total open charm production ($\sigma _{\mathrm {tot}}(c\overline c)$ = 7.1 $\pm$ 2.3(stat) $\pm$1.4(syst) $\mu$b/nucleon) at the collision c.m. energy $\sqrt {s}$ = 11.8 GeV is well above the QCD model predictions. The contributions of different species of charmed particles to the total cross section of the open charm production in proton-nucleus interactions vary with energy.Comment: 4 pages, 6 pages, 38th International Conference on High Energy Physics 3-10 August 2016, Chicago, US

ON POSSIBILITY OF USING OF Al2O3/MgO CERAMIC COMPOSITE TO DETECT PULSED ELECTRON BEAMS

The Al2O3/MgO composite was synthesized under a high temperature in vacuum. The TL curve was obtained. The dependence of the TL peak intensity at 200 oC on the dose irradiation by pulsed electron beam with energy of 130 keV was determined. It was found that the dose response in the range from 1.5 to 10kGy is superlinear

INFLUENCE OF HIGH-TEMPERATURE PROCESSING ON LUMINESCENT PROPERTIES OF MONOCLINIC ZIRCONIUM OXIDE

The cathodo- and thermoluminescence of samples of monoclinic zirconium oxide (ZrO2) under the influence of annealing in a reducing carbon medium was studied. As a result, it can be seen that this annealing leads to an increase in the luminescence intensity. The results may indicate an increase of the number of oxygen vacancies