Sféra (Slovakia)

Isotope identification is a recurrent problem in <inline-formula> <tex-math notation="LaTeX">$\gamma $ </tex-math></inline-formula> spectroscopy with high-purity germanium detectors. In this work, new strategies are introduced to facilitate this type of analysis. Five criteria are used to identify the parent isotopes making a query on a large database of <inline-formula> <tex-math notation="LaTeX">$\gamma $ </tex-math></inline-formula> lines from a multitude of isotopes producing an output list whose entries are sorted so that the <inline-formula> <tex-math notation="LaTeX">$\gamma $ </tex-math></inline-formula> lines with the highest chance of being present in a sample are placed at the top. A metric to evaluate the performance of the different criteria is introduced and used to compare them. Two of the criteria are found to be superior than the others: one based on fuzzy logic and another that makes use of the <inline-formula> <tex-math notation="LaTeX">$\gamma $ </tex-math></inline-formula> relative emission probabilities. A program called histoGe implements these criteria using an SQLite database containing the <inline-formula> <tex-math notation="LaTeX">$\gamma $ </tex-math></inline-formula> lines of isotopes which was parsed from WWW Table of Radioactive Isotopes. histoGe is Free Software and is provided along with the database so they can be used to analyze spectra obtained with generic <inline-formula> <tex-math notation="LaTeX">$\gamma $ </tex-math></inline-formula>-ray detectors.

Introduction. Saturated polymer microspheres represent one of the leading developments in the field of chemoembolization. Due to the complicated multi-stage production in the Russian market, mainly foreign manufacturers of these products are represented, which may indicate the relevance of studying this topic.Aim. The aim of the work was to develop a technological scheme for the production of polymer microspheres and a description of critical control points of production.Materials and methods. The study of the intermediate product was carried out using a Levenhuk D320L microscope (Levenhuk Inc, USA). Analysis of production control points was carried out by the HACCP (Hazard analysis and critical control points) method.Results and discussion. As a result of the study, the main technological stages of the production of microspheres, which are a copolymer of vinyl alcohol and sodium acrylate, have been identified and described. For each technological stage, control critical points are determined with an indication of the controlled parameters and control methods. The photographs of the intermediate product at intermediate stages are shown.Conclusion. A technological scheme for the production of microspheres has been developed. The analysis of critical control points of the stages of the main production process is carried out. Identified irreversible critical points of production.

Selective laser melting (SLM) technology makes it possible to produce complex shape metallic and metal-matrix composite (MMC) bulk parts from powder feedstock. This paper is devoted to selective laser melting of mechanically mixed metal (gas atomized EP648 alloy) and ceramic (alumina) powders. Four 10x10x5 mm specimen were successfully manufactured using different process parameters. Obtained MMC specimen were characterized by scanning electron microscopy. A possibility of manufacturing of dense EP648-alumina MMC by SLM using two-component mixed powder was shown