Suchergebnisse

The article raises topical issues of the implementation of the competency approach to the professional activity of a higher education teacher, differentiation of pedagogic work, the introduction of individual and subjective approaches to the organization of the educational process at a university. The changes occurring in higher education, and the requirements for the teacher in the modern educational environment, which are associated with the multifunctionality of the role of the teacher in modern conditions, are described – be able to educate students and evaluate knowledge and competences, organise scientifi c activities, update the content and forms of taught disciplines taking into account state standards of education of the Russian Federation, involve students in project activities, apply distance learning technologies, cooperate with employers. The possible role positions of the modern teacher of higher education («methodologist-subject», «mentor», «tutor», «scientist», «educator», «coordinator»), as well as the competences, knowledge necessary for the successful implementation
of these positions, have been identifi ed and described. skills, pedagogic actions and means. The results of the study of the role structure of the professional activity of teachers of Kostroma State University are presented, the main points of growth of
professional competences of the university teaching staff are identified.

The catalytic properties of modified Au/TiO 2 catalysts for low-temperature CO oxidation are affected by deactivation and reactivation after long-term storage and by redox treatments. The effect of these phenomena on the catalysts was studied by HRTEM, BET, SEM, FTIR CO, XPS and H 2 TPR methods. The main cause for the deactivation and reactivation of catalytic properties is the variation in the electronic state of the supported gold, mainly, the proportion of singly charged ions Au + . The most active samples are those with the highest proportion of singly charged gold ions, while catalysts with a high content of trivalent gold ions are inactive at low-temperatures. Active states of gold, resistant to changes caused by the reaction process and storage conditions, can be stabilized by modification of the titanium oxide support with transition metals oxides. The catalyst modified with lanthanum oxide shows the highest stability and activity. ; We acknowledge support by the CSIC Open Access Publication Initiative through its Unit of Information Resources for Research (URICI). ; This work was funded by CONACYT project 260409 and PAPIIT-UNAM project IT200114 (Mexico); CSIC project 201180E104 and MINECO project CTQ2013-41507-R (Spain); and Government Program "Science" of Tomsk Polytechnic University, grant No. 4.1187.2014/K (Russia).

The nature and size of the real active species of nanoparticulated metal supported catalysts is still an unresolved question. The technique of choice to measure particle sizes at the nanoscale, HRTEM, has a practical limit of 1 nm. This work is aimed to identify the catalytic role of subnanometer species and methods to detect and characterize them. In this frame, we investigated the sensitivity to redox pretreatments of Ag/Fe/TiO 2 , Ag/Mg/TiO 2 and Ag/Ce/TiO 2 catalysts in CO oxidation. The joint application of HRTEM, SR-XRD, DRS, XPS, EXAFS and XANES methods indicated that most of the silver in all samples is in the form of Ag species with size <1 nm. The differences in catalytic properties and sensitivity to pretreatments, observed for the studied Ag catalysts, could not be explained taking into account only the Ag particles whose size distribution is measured by HRTEM, but may be explained by the presence of the subnanometer Ag species, undetectable by HRTEM, and their interaction with supports. This result highlights their role as active species and the need to take them into account to understand integrally the catalysis by supported nanometals. ; We acknowledge support by the CSIC Open Access Publication Initiative through its Unit of Information Resources for Research (URICI). ; This research was supported by Government Program "Science" of Tomsk Polytechnic University, Grant No. 4.1187.2014/K, CONACYT Project 260409 and PAPIIT-UNAM Project IT200114 (Mexico), CSIC project 201480E077 and MINECO Project CTQ2013-41507-R (Spain). We gratefully thank O. Martynyuk, G. Torres Otañez, Z. I. Bedolla Valdez, E. Flores, F. Ruiz Medina, A. Olivas Sarabia, I. Gradilla, J. Mendoza, E. M. Aparicio Ceja, J. Peralta, David A. Domínguez, M. Sainz, R. Valdez Castro, M. Martínez, B. Acosta Ruelas, F. Ramírez Hernández and M. López Cisneros for valuable technical assistance.