PULSE ARC SHIELDED GAS WELDING WITH ADDITIONAL HOT FILLER OF HIGH-STRENGTH HARDENING STEELS

An installation for pulsed arc welding in shielding gases with the supply of an additional hot additive with indirect heating to the tail part of the weld pool has been developed

An approach to verification and validation of MHD codes for fusion applications

We propose a new activity on verification and validation (V&V) of MHD codes presently employed by the fusion community as a predictive capability tool for liquid metal cooling applications, such as liquid metal blankets. The important steps in the development of MHD codes starting from the 1970s are outlined first and then basic MHD codes, which are currently in use by designers of liquid breeder blankets, are reviewed. A benchmark database of five problems has been proposed to cover a wide range of MHD flows from laminar fully developed to turbulent flows, which are of interest for fusion applications: (A) 2D fully developed laminar steady MHD flow, (B) 3D laminar, steady developing MHD flow in a non-uniform magnetic field, (C) quasi-two-dimensional MHD turbulent flow, (D) 3D turbulent MHD flow, and (E) MHD flow with heat transfer (buoyant convection). Finally, we introduce important details of the proposed activities, such as basic V&V rules and schedule. The main goal of the present paper is to help in establishing an efficient V&V framework and to initiate benchmarking among interested parties. The comparison results computed by the codes against analytical solutions and trusted experimental and numerical data as well as code-to-code comparisons will be presented and analyzed in companion paper/papers.Peer ReviewedPostprint (author's final draft

Improving the Productivity and Quality of High-Strength Steel Welds, Performed by Pulse-Arc Welding with Additional Hot Additive

Выполнена сварка высокопрочной стали типа 45Х2НМФБА толщиной 6,3 мм импульсно-дуговой сваркой с применением дополнительной горячей присадочной проволоки. Проведен анализ структуры сварного шва и линии сплавления сварного соединения, а также определена твердость и микротвердость сварного соединения.Welding of high-strength steel of type 45Cr2NiMoVNb with a thickness of 6.3 mm was carried out using pulse-arc welding with the use of an additional hot filler wire. The analysis of the structure of the weld and the fusion line of the welded joint was carried out, and the hardness and microhardness of the welded joint were determined

Localized holes and delocalized electrons in photoexcited inorganic perovskites: Watching each atomic actor by picosecond X-ray absorption spectroscopy

We report on an element-selective study of the fate of charge carriers in photoexcited inorganic CsPbBr3 and CsPb(ClBr)3 perovskite nanocrystals (NCs) in toluene solutions using time-resolved X-ray absorption spectroscopy with 80 ps time resolution. Probing the Br K-edge, the Pb L3-edge and the Cs L2-edge, we find that holes in the valence band are localized at Br atoms, forming small polarons, while electrons appear as delocalized in the conduction band. No signature of either electronic or structural changes are observed at the Cs L2-edge. The results at the Br and Pb edges suggest the existence of a weakly localized exciton, while the absence of signatures at the Cs edge indicates that the Cs+ cation plays no role in the charge transport, at least beyond 80 ps. These results can explain the rather modest charge carrier mobilities in these materials.Comment: 19 pages, 3 figure

New NIR-emissive tetranuclear Er(III) complexes with 4-hydroxo-2,1,3-benzothiadiazolate and dibenzoylmethanate ligands: synthesis and characterization

New tetranuclear heteroleptic complexes [Er4(dbm)6(O-btd)4(OH)2] (1) and [Er4(dbm)4(O-btd)6(OH)2] (2) (O-btd = 4-hydroxo-2,1,3-benzothiadiazolate and dbm = dibenzoylmethanide) and their solvates with toluene, THF and CH2Cl2 were prepared using two synthetic approaches. The structures of the products were confirmed by single-crystal X-ray diffraction. Magnetic properties of 1 and 2 are in good agreement with X-ray data. The effective magnetic moment (μeff) values at 300 K for 1 and 2 corresponds to a system of 4 non-interacting Er(III) ions in the ground state 4J15/2 with g = 6/5. At ambient temperature and upon excitation with λexc = 450 nm, complexes 1 and 2 exhibit luminescence at ∼1530 nm, i.e. in the near infra-red (NIR) region. The luminescence intensity grows with increasing the number of the (O-btd)−ligands in the complexes. This observation suggests (O-btd)− as a new efficient antenna ligand for the lanthanide-based NIR luminescence

Direct observation of electron density reconstruction at the metal-insulator transition in NaOsO3

5d transition metal oxides offer new opportunities to test our understanding of the interplay of correlation effects and spin-orbit interactions in materials in the absence of a single dominant interaction. The subtle balance between solid-state interactions can result in new mechanisms that minimize the interaction energy, and in material properties of potential use for applications. We focus here on the 5d transition metal oxide NaOsO3, a strong candidate for the realization of a magnetically driven transition from a metallic to an insulating state exploiting the so-called Slater mechanism. Experimental results are derived from non-resonant and resonant x-ray single crystal diffraction at the Os L-edges. A change in the crystallographic symmetry does not accompany the metal-insulator transition in the Slater mechanism and, indeed, we find no evidence of such a change in NaOsO3. An equally important experimental observation is the emergence of the (300) Bragg peak in the resonant condition with the onset of magnetic order. The intensity of this space-group forbidden Bragg peak continuously increases with decreasing temperature in line with the square of intensity observed for an allowed magnetic Bragg peak. Our main experimental results, the absence of crystal symmetry breaking and the emergence of a space-group forbidden Bragg peak with developing magnetic order, support the use of the Slater mechanism to interpret the metal-insulator transition in NaOsO3. We successfully describe our experimental results with simulations of the electronic structure and, also, with an atomic model based on the established symmetry of the crystal and magnetic structure.Comment: 6 figure

Joint effect of the mycotoxins T-2 toxin, deoxynivalenol and zearalenone on the weaner pigs against a background of the infection load

Currently, among more than 100 000 known species of fungi about 250 species produce mycotoxins, secondary metabolites which are dangerous to human and animal health. Most of these toxins are highly resistant to physical and chemical factors, and are not destroyed even after prolonged heating of feed contaminated with mycotoxins. The aim of the present study was to investigate the joint effects of T-2 toxin, zearalenone, deoxynivalenol and infectious agents on pigs. The study was conducted inthe Federal Center for Toxicological, Radiation and BiologicalSafety. Studies have shown that the jointdietary intake T-2 toxin at a dose of 70 mg/kg, zearalenoneat a dose of 50 mg/kg and deoxynivalenolat a dose of 1000 mg/kg for 30 days against a background of the simulated Clostridium infection load causes symptomatic mycotoxicosis which is accompanied by activation of lipoperoxidation, decrease in hematological, biochemical and immunological parameters: a reduction in the number of T and B lymphocytes, titers of specific protective antibodies and the development of pathological processes in the tissues and organs of weaner pigs, slow weight gain, increase in feed conversion ratio and the development of infectious disease, confirmed with laboratory tests. The result was different in the group of animals with the same infection load but without introducing mycotoxins into the animal diet. The findings provide strong evidence that chronic intake of fuzariotoxins even at the level of permissible concentrations against a background of infection load predisposes to infectious diseases

Planning of Technological Development of New Products and Its Impact on the Economic Performance of the Enterprise

The market economy is characterized by competition of enterprises, defining the upgrade of production. Improvement of the economic activity of industrial enterprises implies development of new methods, forms and mechanisms of creation and mastering of new competitive products designed to ensure the predominant position of enterprises on domestic and foreign markets. Modern approaches to the creation and development of new competitive products high-tech require a huge amount of costs. But on the other hand it is the development of new products allows companies to survive in the current competitive environment. Planning for new products refers to the section of strategic planning. Therefore, the ability of the company to develop and introduce to the market its new product depends on its financial performance. A necessary step in production planning is the development of new products, representing a diverse set of processes and activities in the process which is carried out inspection and testing of structures and technologies to specified technical requirements, development of new forms of organization of production. During the development of new products are achieved the planned production volumes, scheduled economic indicators and technical and economic parameters of products. The period of development of new products begins with production of a prototype and ends with serial production. Keywords: innovation, innovation economy, economic indicators, new products, development of production JEL Classifications: O14, O21, O32, O3

Synthesis, luminescent and magnetic properties of new tetranuclear lanthanide complexes with 4-hydroxy-2,1,3-benzothiadiazolate and dibenzoylmethanide ligands

© 2017 Elsevier LtdFour new tetranuclear complexes, [Ln4(dbm)4(O-btd)6(OH)2] 1a (Ln = Yb), 1b (Ln = Dy) and [Ln4(dbm)6(O-btd)4(OH)2] 2a (Ln = Yb), 2b (Ln = Dy) (O-btd = 4-hydroxo-2,1,3-benzothiadiazolate and dbm = dibenzoylmethanide), and their solvates with toluene and tetrahydrofuran were synthesized. The magnetic properties of the complexes 1a, 1b, 2a and 2b have been studied, revealing different magnetic susceptibility patterns for the Yb(III) and Dy(III) complexes in the temperature range 80–300 K. Upon lowering the temperature, a weak antiferromagnetic ordering is observed for both Yb compounds, while the Dy derivatives are assumed to show weak ferromagnetic interactions. The Yb complexes 1a and 2a demonstrate strong NIR luminescence at ∼1000 nm in CH2Cl2 solution upon excitation of the (O-btd)− ligand. This observation suggests the (O-btd)− ligand to be an efficient antenna ligand for lanthanide-based NIR luminescence