Innovative material based on wood waste for application in special purpose vehicles

The article presents innovative composite wood material DS-1 with a powder binding, which is used in special purpose vehicles. Vehicles for transporting radioactive waste for its recycling and disposal, and radiodiagnostics mobile complexes intended for conducting massive X-ray have been considered. The composition of material DS-1 has been revealed, experiments have been listed and a table with physical and mechanical properties has been given. Relying on experimental analysis data it can be concluded that implementation of innovative composite material DS-1 with a powder binder using barium sulphate helps solve the problem of lead replacement with lighter environmentally friendly material and contributes to complex use of wood raw materials Using a low-toxic binder in the material obtained makes its production innocuous and environmentally friendly and and solves a number of economic and energy-saving problems. © 2019 Published under licence by IOP Publishing Ltd

Use of Articulated Transport Systems in the Mining Industry

The work is devoted to the possibility and prospects of the use of all-wheels drive articulated transport systems in the mining complex. A comparative analysis of the traditional methods of exporting minerals in open pit mining and the method of using active trailed elements are given. The trailer has a load factor several times higher than the same rate for mining dump trucks. The use of an active trailer makes it possible to reduce the mass of the tractor and trailer by almost 40 tons and increase the specific power of the road train. © Published under licence by IOP Publishing Ltd

Roller-Coaster in a Flatland: Magnetoresistivity in Eu-intercalated Graphite

Novel phenomena in magnetically-intercalated graphite has been a subject of much research, pioneered and promoted by M.~S. and G.~Dresselhaus and many others in the 1980s. Among the most enigmatic findings of that era was a dramatic, roller-coaster-like behavior of the magnetoresistivity in EuC$_6$ compound, in which magnetic Eu$^{2+}$ ions form a triangular lattice that is commensurate to graphite honeycomb planes. In this study, we provide a long-awaited {\it microscopic} explanation of this behavior, demonstrating that the resistivity of EuC$_6$ is dominated by spin excitations in Eu-planes and their highly nontrivial evolution with the magnetic field. Together with our theoretical analysis, the present study showcases the power of the synthetic 2D materials as a source of potentially significant insights into the nature of exotic spin excitations.Comment: Fixed typos, improved Fig. 4 and Eq. (2). 35 pages, 16 figures. Immense pedagogical power. Embedde

Using the simulation modeling with stochastic estimation of trafficability of forest transport systems

Forecasting trafficability of logging and forest transport systems on the ground, which have a multi-sectional layout solution is considered in the paper. Trafficability problems are evaluated from the point of view of the stochastic character of indicators of traction properties - the forces of resistance to movement and the adhesion force of the driving wheels with the supporting surface. With the stochastic estimation of trafficability the law of Gaussian distribution for random values of the rolling resistance coefficient and the two-parameter Weibull distribution law with a negative asymmetry coefficient or values of the shape parameter greater than 4 for the cohesion coefficient was adopted. A stochastic approach to the evaluation of trafficability allows to ensure a rational distribution of the power flows between propulsors of the transport-technological system, which is shown in this paper. © 2019 Published under licence by IOP Publishing Ltd

Using the simulation modeling with stochastic estimation of trafficability of forest transport systems

Forecasting trafficability of logging and forest transport systems on the ground, which have a multi-sectional layout solution is considered in the paper. Trafficability problems are evaluated from the point of view of the stochastic character of indicators of traction properties - the forces of resistance to movement and the adhesion force of the driving wheels with the supporting surface. With the stochastic estimation of trafficability the law of Gaussian distribution for random values of the rolling resistance coefficient and the two-parameter Weibull distribution law with a negative asymmetry coefficient or values of the shape parameter greater than 4 for the cohesion coefficient was adopted. A stochastic approach to the evaluation of trafficability allows to ensure a rational distribution of the power flows between propulsors of the transport-technological system, which is shown in this paper. © 2019 Published under licence by IOP Publishing Ltd

Lamellar structure and nanomechanical properties of quasicrystalline Al-Cu-Fe alloys

The kinetics of structural phase transformations in quasicrystal-forming Al-Cu-Fe alloys with compositions in the region of stability of the icosahedral (i) phase has been investigated. It has been shown that, depending on the development of metastable transformations i → pentagonal phases P1 and P2, a homogeneous lamellar structure (i + P1 + P2) or a polygrain i-phase is formed in the alloys. The P-h diagrams obtained upon nanoindentation, atomic force microscopy, and scanning electron microscopy of indentations have demonstrated signs of elasto-plastic deformation of the alloys with lamellar and polygrain icosahedral structures. It has been found that, in contrast to the polygrain icosahedral alloys with a normal size effect of nanoindentation, the alloys with a lamellar structure are characterized by a nonmonotonic dependence of the hardness (H) on the maximum load (P max) and exhibit the effect of strain hardening in the range of loads 50 mN ≤ P max < 500 mN. The strain hardening is considered as the result of resistance exerted by boundaries of the lamellar structure to the development of plastic deformation. © 2013 Pleiades Publishing, Ltd

CONCEPTUAL AND ANALYTICAL FEATURES OF ATTRIBUTION FOR BIOSPHERE CONSTRUCTION PROJECTS IN THE DEVELOPMENT MANAGEMENT SYSTEM

The subject of the research is determined by the methodology and applied tools of organization of biosferous construction as a basis for rational preparation and construction of objects, implemented by modern construction development on the principles of ecologization and energy efficiency. As a research object, biospheric construction has been selected as an advanced format for organizing a cycle of construction projects in a modern urbanization environment. With regard to the construction project, model diagnostics (model predictive identification) is used with the help of the model of air pollution from industrial point sources of technogenesis. The obtained results of numerical analysis of the realization of city functions can predict the development of urban areas, assess the comfort and safety of the urban environment from the standpoint of biosphere compatibility of construction objects in order to harmonize the characteristics of the life cycle of these projects with the characteristics of the microenvironment of their implementation. The basis of such tools is: multifactorial, multicomponent modeling and multicriteria selection of alternatives for building construction for projects, provided that the level of biospheric compatibility is used as the leading analytical coordinate of such simulation. These models, implemented in the format of modern construction, will serve as a basis for organizational and technological and environmental expertise of projects.Keywords: organization of construction, organizational and technological reliability, construction project, biosphere compatibility, development.кандидат технічних наук, Чернишев Д. О., Дружинін М. А. Концептуально-аналітичні особливості атрибуції проектів біосферосумісного будівництва в системі девелоперського управління / Київський національний університет будівництва і архітектури, Україна, КиївПредметом дослідження визначено методологію та прикладний інструментарій організації біосферосумісного будівництва як основу раціональної підготовки та будівництва об’єктів, реалізований сучасним будівельним девелопментом на засадах екологізації та енергоощадності. В якості об’єкту дослідження обрано біосферосумісне будівництво як передовий формат організації циклу проектів будівництва, в умовах сучасного рівня урбанізації. Стосовно будівельного проекту застосовується модельна діагностика (модельна прогнозна ідентифікація) за допомогою моделі забруднення повітря від промислових точкових джерел техногенезу. Отримані результати чисельного аналізу реалізації функцій міста дозволяють спрогнозувати розвиток міської території, оцінити комфортність і безпеку міського середовища з позиції біосферної сумісності будівельних об'єктів з метою гармонізації характеристик життєвого циклу цих проектів з характеристиками мікросередовища їх впровадження. Базисом такого інструментарію є: методи багатофакторного, багатокомпонентного моделювання та багатокритеріального вибору альтернатив організації будівництва для проектів за умови застосування рівня біосферосумісності в якості провідної аналітичної координати такого моделювання. Зазначені  моделі, реалізовані у форматі сучасного будівельного девелопменту, слугуватимуть в подальшому основою для організаційно-технологічної та екологічної експертизи проектів.Ключові слова: організація будівництва, організаційно-технологічна надійність, будівельний проект, біосферосумісність, девелопмен

Quantum vs. Geometric Disorder in a Two-Dimensional Heisenberg Antiferromagnet

We present a numerical study of the spin-1/2 bilayer Heisenberg antiferromagnet with random interlayer dimer dilution. From the temperature dependence of the uniform susceptibility and a scaling analysis of the spin correlation length we deduce the ground state phase diagram as a function of nonmagnetic impurity concentration p and bilayer coupling g. At the site percolation threshold, there exists a multicritical point at small but nonzero bilayer coupling g_m = 0.15(3). The magnetic properties of the single-layer material La_2Cu_{1-p}(Zn,Mg)_pO_4 near the percolation threshold appear to be controlled by the proximity to this new quantum critical point.Comment: minor changes, updated figure

Dynamic Coupling Between Links Of Articulated Transport Systems

The issues of improving the operational properties of transport systems are considered. Various ways to improve productivity, economic and environmental performance, operational reliability, as well as improve and automate the transport system controls are shown. One of the most important issues in the theory of movement, i.e., the effective distribution of the power flow between the drive axles and sections is considered. The coupling between the transport system links is estimated. The coupling between the links of active articulated multi-section machines has been analyzed based on various variants of the kinematic misalignment in the drive. The state graph of a two-section active articulated transport and production machine is considered. The coupling between the links of the articulated transport system is considered and formalized for the pole trailer supported simultaneously by two or more machine sections. The areas of further link coupling analysis based on the state graph of a two-section active articulated transport system are determined. © 2022, The Author(s), under exclusive license to Springer Nature Switzerland AG