Effect of cobalt powder morphology on the properties of WC-Co hard alloys

The effect of cobalt powder morphology on the microstructure of WC-Co hard alloys produced by sintering cobalt + tungsten carbide powder mixtures has been studied using X-ray diffraction, laser diffraction, scanning electron microscopy, density measurements, and Vickers microhardness tests. The results indicate that, under identical sintering conditions, the densest and most homogeneous microstructure is formed in hard alloys sintered using cobalt powders consisting of rounded particles. The use of cobalt powders with dendritic morphologies impedes the homogenization of Co + WC powder mixtures and preparation of pore-free WC-Co hard alloys. © 2013 Pleiades Publishing, Ltd

Uncertainty as the substratum of entrepreneurship

© 2015, Mediterranean Center of Social and Educational Research. All rights reserved. The article addressed the stochastic issues of modern business environment, the content of the concepts of uncertainty and risk. The basis of the concept of business initiatives are defined through the prism of ontology of venture activities. It is proved that the risk enhances the capabilities of a subject and increases its adaptive capacity due to the timely actions. That is why the risk becomes the property of a particular resource that can improve the sustainability of a business entity acting in the face of uncertainty. The sources of uncertainty and risk are shown, being conditional to the implementation of particular subject activity in the business sector. From the standpoint of this study, risk is considered as an attribute of entrepreneurship, which is sure to arise in situations where alternatives are possible, realized in many outcomes. There is uncertainty about a particular outcome, and at least one of the outcomes is harmful. In a broad sense, the risk is understood as a solution associated with the choice of a wide variety of complementary or alternative options, the result of which is internally and unavoidably inherent with uncertainty. Thus, the risk is a characteristic of solutions made by the subject, reflecting the uncertainty of achieving the objectives of its activities. Uncertainty, acting as a substrate of entrepreneurship, is implemented in various alternative ways of achieving subjective goals. Under these conditions, the venture of business activity is manifested most clearly, and the risk is acquiring attribute qualities as an immanent feature of the modern business environment

Innovation infrastructure development trends of the Russian Federation

The role of innovations in formation of the effective infrastructure is unfolded in the article. The theoretical aspects of a concept disclosure, an input of foreign and domestic scientists are considered. System elements of the infrastructure environment are analysed

Innovation infrastructure development trends of the Russian Federation

The role of innovations in formation of the effective infrastructure is unfolded in the article. The theoretical aspects of a concept disclosure, an input of foreign and domestic scientists are considered. System elements of the infrastructure environment are analysed

Conformal symmetry in quasi-free Markovian open quantum systems

Conformal symmetry governs the behavior of closed systems near second-order phase transitions, and is expected to emerge in open systems going through dissipative phase transitions. We propose a framework allowing for a manifest description of conformal symmetry in open Markovian systems. The key difference from the closed case is that both conformal algebra and the algebra of local fields are realized on the space of superoperators. We illustrate the framework by a series of examples featuring systems with quadratic Hamiltonians and linear jump operators, where the Liouvillian dynamics can be efficiently analyzed using the formalism of third quantization. We expect that our framework can be extended to interacting systems using an appropriate generalization of the conformal bootstrap.Comment: 15 pages, supplementary Wolfram Mathematica notebook available at https://github.com/idnm/third_quantization v2: minor revision (references added, typos corrected) v2: Minor revisions done and typos correcte

К вопросу о технологиях непрерывной математической подготовки бакалавров технического направления

The mechanism of the development and introduction in educational process of didactic ensure continuous mathematical education of bachelors technical direction. It is shown that the continuous updating of mathematical knowledge is a necessary condition for the formation of the students required today abilities to the solution of professional tasks.Предложен механизм разработки и внедрения в учебный процесс, дидактического обеспечения непрерывной математической подготовки бакалавров технического направления. Показано, что непрерывная актуализация математических знаний является необходимым условием формирования у студентов требуемых сегодня способностей к решению профессиональных задач

EFFECT OF Al ADDITION ON THE PHASE COMPOSITION, MICROSTRUCTURE, AND MICROHARDNESS OF NANOCRYSTALLINE WC CERAMICS

Nanocrystalline WC and WC-Al powders were prepared by high energy ball milling and mixing in a planetary ball mill. The phase composition, microstructure and microhardness of ceramics sintered from these powders have been investigated

Numerical Analysis of Liquid Menisci in the EFG Technique

This chapter is devoted to the analysis of the behavior of the profile curves of the melt menisci for the sapphire crystal growth by edge-defined film-fed growth (EFG) technique. The menisci of the shaped crystals with capillary channels, fibers, and tubes (including cases of outer and inner circular menisci) are considered. Also, we investigated the profile curves of menisci both in the cases of the positive and negative angles between profile curve and the working edge of the die. The cases of outer and inner circular menisci of the tubular crystals and menisci at capillaries and fibers are considered