Synthesis of double oxides TiO2-SiO2 with low titanium content by hydrolysis of tetrabutoxytitanium-tetraethoxysilane mixture in an atmosphere of water vapor and ammonia

A series of TiO2-SiO2 binary xerogels with the titanium content lower than 7 mol % were prepared by joint hydrolysis of tetrabutoxytitanium and tetraethoxysilane in a desiccator in the atmosphere of vapor over 5% aqueous NH3 solution under static conditions. The physicochemical properties of the material were examined by IR spectroscopy and by the kinetic method with hydrogen peroxide decomposition as model reaction. © 2013 Pleiades Publishing, Ltd

ПЕДАГОГІЧНІ УМОВИ ВИКОРИСТАННЯ АКТИВНИХ МЕТОДІВ НАВЧАННЯ У ПРОЦЕСІ ПІДГОТОВКИ ФАХІВЦІВ МЕДИЧНОГО ПРОФІЛЮ

The aim of the work – to analyze the essence of active methods of teaching, the peculiarities of their use in the educational process and to determine the pedagogical conditions that contribute to the improvement of the quality of medical specialists training.The main body. The article presents an analysis of the active learning methods and defines the special features of their use to improve quality of the educational process and training of future specialists. Besides of that, we substantiate pedagogical conditions of employment of the active learning methods, particularly in the training of specialists of medical profile. The authors consider that the introduction of such methods is one of the most promising way to improve the training of future professionals, including doctors, and gives necessary knowledge and practical skills to them. The article determines the main pedagogical conditions of the active learning methods in the training of interns such as the identity and pedagogical skills of a teacher and the diversification of forms and methods of training.Conclusion. We are sure that the method of discussion, the didactic games, the method of situational analysis (case method), the multimedia learning and the method of simulation are the most effective for a professional development of interns.Мета роботи – проаналізувати сутність активних методів навчання, особливості їх використання в освітньому процесі та визна­чити педагогічні умови, що сприяють підвищенню якості підготовки фахівців медичного профілю.Основна частина. У статті наводиться аналіз активних методів навчання, визначаються особливості їх використання з метою підвищення якості освітнього процесу та підготовки майбутніх фахівців. Обґрунтовуються педагогічні умови використання активних методів навчання, зокрема у підготовці фахівців медичного профілю. Визначається, що серед основних педагогічних умов є, по-перше, особистість викладача та рівень його педагогічної майстерності, а по-друге – урізноманітнення форм та методів навчання і безпосереднє упровадження активних методів в освітній процес.Висновок. Підкреслюється, що найбільш ефективний вплив на професійний розвиток лікаря-інтерна, як компетентної особистості та конкурентоспроможного фахівця, здійснюється завдяки застосуванню в освітньому просторі ВНЗ таких активних методів, як: навчання в дискусії, дидактичні ігри, метод ситуаційного аналізу (кейс-метод), мультимедійні засоби навчання, метод моделювання ситуацій (симуляційне навчання) та ін

Synthesis of Cu(II)-containing TiO2-SiO2 binary xerogels by hydrolysis of a mixture of tetrabutoxytitanium, tetraethoxysilane, and copper(II) chloride in a water-ammonia atmosphere

A Cu(II)-containing binary xerogel TiO2-SiO2 was synthesized by joint hydrolysis of tetrabutoxytitanium, teraethoxysilane and copper(II) chloride dissolved in their mixture. The synthesis was performed in a vapor of 10% aqueous ammonia under static conditions. EPR spectroscopy was used to examine the state of Cu(II) in the xerogel matrix. Data on specific features of the behavior of saccharose within xerogel pores under heating were obtained. The catalytic activity of the xerogel was tested by the kinetic method on model reactions of hydrogen peroxide decomposition and oxidative dehydrogenation of trimethylhydroquinone. © 2013 Pleiades Publishing, Ltd

Star formation around the H II region Sh2-235

We present a picture of star formation around the H ii region Sh2-235 (S235) based upon data on the spatial distribution of young stellar clusters and the distribution and kinematics of molecular gas around S235. We observed 13CO (1-0) and CS (2-1) emission toward S235 with the Onsala Space Observatory 20-m telescope and analysed the star density distribution with archival data from the Two Micron All-Sky Survey (2MASS). Dense molecular gas forms a shell-like structure at the southeastern part of S235. The young clusters found with 2MASS data are embedded in this shell. The positional relationship of the clusters, the molecular shell and the H ii region indicates that expansion of S235 is responsible for the formation of the clusters. The gas distribution in the S235 molecular complex is clumpy, which hampers interpretation exclusively on the basis of the morphology of the star-forming region. We use data on kinematics of molecular gas to support the hypothesis of induced star formation, and distinguish three basic types of molecular gas components. The first type is primordial undisturbed gas of the giant molecular cloud, the second type is gas entrained in motion by expansion of the H ii region (this is where the embedded clusters were formed) and the third type is a fast-moving gas, which might have been accelerated by winds from the newly formed clusters. The clumpy distribution of molecular gas and its kinematics around the H ii region implies that the picture of triggered star formation around S235 can be a mixture of at least two possibilities: the 'collect-and-collapse' scenario and the compression of pre-existing dense clumps by the shock wave. Journal compilation © 2008 RAS

Star formation around the H II region Sh2-235

We present a picture of star formation around the H ii region Sh2-235 (S235) based upon data on the spatial distribution of young stellar clusters and the distribution and kinematics of molecular gas around S235. We observed 13CO (1-0) and CS (2-1) emission toward S235 with the Onsala Space Observatory 20-m telescope and analysed the star density distribution with archival data from the Two Micron All-Sky Survey (2MASS). Dense molecular gas forms a shell-like structure at the southeastern part of S235. The young clusters found with 2MASS data are embedded in this shell. The positional relationship of the clusters, the molecular shell and the H ii region indicates that expansion of S235 is responsible for the formation of the clusters. The gas distribution in the S235 molecular complex is clumpy, which hampers interpretation exclusively on the basis of the morphology of the star-forming region. We use data on kinematics of molecular gas to support the hypothesis of induced star formation, and distinguish three basic types of molecular gas components. The first type is primordial undisturbed gas of the giant molecular cloud, the second type is gas entrained in motion by expansion of the H ii region (this is where the embedded clusters were formed) and the third type is a fast-moving gas, which might have been accelerated by winds from the newly formed clusters. The clumpy distribution of molecular gas and its kinematics around the H ii region implies that the picture of triggered star formation around S235 can be a mixture of at least two possibilities: the 'collect-and-collapse' scenario and the compression of pre-existing dense clumps by the shock wave. Journal compilation © 2008 RAS

Comparative Analysis of the Dynamical Spectra of a Polarization of an Active Medium and an Electromagnetic Field in the Superradiant Heterolasers

The complicated pulsed generation regimes of a CW-pumped superradiant semiconductor laser are analyzed via the dynamical spectra of the dipole optical oscillations of active centers. This novel approach appears to be more informative than the standard analysis of the dynamical spectra of laser emission if a dipole relaxation rate is less than a cavity relaxation rate. The advantages of the method are demonstrated for a number of superradiant lasing regimes on the basis of the numerical solution to 1D Maxwell–Bloch equations for a two-level active medium in a low-Q cavity within one-dimensional approximation