This study produced for the first time composites based on polystyrene microspheres with nano-sized titania synthesized by sulfate and sol-gel methods, as well as commercial Hombifine N, Hombikat UV100, and Degussa P25. The starting samples and the composites were characterized by X-ray diffraction, scanning electron microscopy, nitrogen adsorption capacity, and IR spectroscopy. The highest content of nano-titanium dioxide both in the bulk and on the surface of microspheres was obtained with the use of Hombikat UV100. This sample has the largest specific surface area and a high content of reactive OH groups. The adsorption properties of composites were investigated.
Given research considers the Business Intelligence analysis of computer based business games. A tool environment, called Competence-based Business Game Studio (CBGS), is applied for business games’ design and development. An approach is proposed that allows designing and conducting business games based on enterprises business processes. Consequently, CBGS may be considered as a universal product with respect to domain. Competence-based Business Game Studio consists of several subsystems. The Analysis Subsystem makes possible to exclude human factor from the process of player skills and knowledge assessment, the latter are scored employing an automated approach based on formal parameters. This paper defines the source data for Analysis Subsystem as well. Data warehouse containing multidimensional data marts was designed for the evaluation of player’s competency. Two info-cubes were developed: the first info-cube is proposed to assess players’ actions, the second one - to identify bottlenecks within business processes using efficiency assessment of Decision Making Points. In order to collect information about players Complex Analysis methods are proposed for implementation: such as aggregation, navigation and filtering. To evaluate business game quality three types of Decision Making Points should be distinguished. Decision Making Points completed by players are allocated to the aforementioned types using cluster analysis (PAM-algorithm) and supervised classification.
The paper describes the method for modeling of nanostructure polymerizable multicomponent oxide melts, which can be used for systems of type Me2O-SiO2 (Me = monovalent cation), with the results of a molecular dynamics simulation as input. The models of the short-range and medium-range orders taking into account dual behavior of monovalent alkali metal cations able to form stable groups with oxygen atoms are built. The melt structure is described with help of heterogeneous descriptors which are constructed using the polymer models and molecular dynamics results. The model is a heterogeneous graph which is built with gradually increasing of mapping levels (from selection heterogeneous graph vertices associated with individual particles, to forming connected components of vertices corresponding polyanionic complexes and rings in the melt. Quantitative calculations of the structure associated characteristics are carried out using the distribution function of graph vertices. We have modeled nanostructure and studied polymerization processes in the system SiO2-Na2O in the range of five compositions by the above method. In particular, we calculated the radial and angular distribution, the distribution of the coordination numbers, the bond lengths, the mole portions of different types of oxygen atoms, the complex anions in the model system taking into account sodium ions, the proportion of flat rings in polyanionic complexes, as well as the average connection factor. The obtained results give a satisfactory agreement with the characteristics in the range having experimental data. A number of results the structure modeling has a scientific novelty and practical significance.
Рассматривается класс систем, описываемых алгебро-разностными уравнениями и называемых дескрипторными (сингулярными). Для таких систем получены условия ограниченности анизотропийной нормы системы – коэффициента усиления системой случайных гауссов ских стационарных возмущений, характеризуемых параметром, который называется средней анизотропией. Условия сформулированы в виде теоремы, приведено подробное доказательство. Рассмотрен численный пример, иллюстрирующий методику вычисления анизотропийной нормы дескрипторной системы на основе доказанной теоремы.
Рассматривается новый алгоритм построения эллиптических кривых, параметры которых удовлетворяют ГОСТ Р 34.10-2012, а также ряду дополнительных условий. Эти условия вводятся для противодействия известным атакам на задачу дискретного логарифмирования, использующим специальный вид параметров эллиптических кривых. Приводятся результаты практических вычислений и конкретные эллиптические кривые, удовлетворяющие введенным условиям