bluuebunny/crossref_metadata_2025 huggingface dataset:
Quantification of atomic force microscopy tip and sample thermal contact
Authors: Umatova Zarina , Zhang Y. , Rajkumar Ravishkrishnan , Dobson Phillip S. , Weaver J. M. R.
Published: September 2019

A thermal conduction measurement device was fabricated, consisting of a silicon dioxide membrane with integrated thermal sensors (Pt resistance heater/thermometer and Pt–Au thermocouples) using MEMS technology. Heat transfer between the heated device and a number of unused atomic force microscope and scanning thermal microscope probes was measured. Changes in thermal conduction related to changes in the tip shape resulting from initial contact were observed. The sensors were fabricated by electron beam lithography and lift-off followed by local subtractive processing of a Pt–Au multilayer to form Pt heater–resistance thermometer elements and Pt–Au thermocouples. Thermal isolation from the silicon substrate was provided by dry release of the supporting 50 nm thick SiO2 membrane using an isotropic SF6 inductively coupled plasma etch. The high thermal isolation of the sample combined with the sensitivity of the temperature sensors used allowed the detection of thermal conduction between the tip and the sample with high precision. The measured temperature range of the Pt resistor was 293–643 K. The measured thermal resistance of the membrane was 3 × 105 K/W in air and 1.44 × 106 K/W in vacuum. The tip contact resistance was measured with a noise level of 0.3g0 T at room temperature, where g0 is the thermal resistance quantum.
Estimating Lyapunov exponents in billiards
Authors: Datseris George , Hupe Lukas , Fleischmann Ragnar
Published: September 2019

Dynamical billiards are paradigmatic examples of chaotic Hamiltonian dynamical systems with widespread applications in physics. We study how well their Lyapunov exponent, characterizing the chaotic dynamics, and its dependence on external parameters can be estimated from phase space volume arguments, with emphasis on billiards with mixed regular and chaotic phase spaces. We show that in the very diverse billiards considered here, the leading contribution to the Lyapunov exponent is inversely proportional to the chaotic phase space volume and subsequently discuss the generality of this relationship. We also extend the well established formalism by Dellago, Posch, and Hoover to calculate the Lyapunov exponents of billiards to include external magnetic fields and provide a software on its implementation.
Numerical model of the radio-frequency magnetic presheath including wall impurities
Authors: Elias M. , Curreli D. , Jenkins T. G. , Myra J. R. , Wright J.
Published: September 2019

Here, we present a numerical fluid plasma model able to capture the enhanced sputtering yield from the Faraday Screen and the Plasma-Facing Components of an Ion Cyclotron Resonance Heating antenna in a fusion machine. The model is a one-dimensional phase-resolved representation of a rectified radio frequency sheath in a magnetic field at an angle with respect to the material surface; the momentum transport of both ions and impurities is computed in the model. The sputtering behavior of the impurities coming off from the wall is obtained from the plasma-material interaction code Fractal-Tridyn. This study analyzes a range of magnetic angles and wave frequencies to parametrically investigate their effect on the energy-angle distributions of the impacting ions and sputtered impurities. Finally, an estimate of the impurity fluxes and of the gross-erosion rate is provided and compared with experimental data available in the literature.
Direct diabatization and analytic representation of coupled potential energy surfaces and couplings for the reactive quenching of the excited 2Σ+ state of OH by molecular hydrogen
Authors: Shu Yinan , Kryven Joanna , Sampaio de Oliveira-Filho Antonio Gustavo , Zhang Linyao , Song Guo-Liang , Li Shaohong L. , Meana-Pañeda Rubén , Fu Bina , Bowman Joel M. , Truhlar Donald G.
Published: September 2019

We have employed extended multiconfiguration quasidegenerate perturbation theory, fourfold-way diabatic molecular orbitals, and configurational uniformity to develop a global three-state diabatic representation of the potential energy surfaces and their couplings for the electronically nonadiabatic reaction OH* + H2 → H2O + H, where * denotes electronic excitation to the A 2Σ+ state. To achieve sign consistency of the computed diabatic couplings, we developed a graphics processing unit-accelerated algorithm called the cluster-growing algorithm. Having obtained consistent signs of the diabatic couplings, we fit the diabatic matrix elements (which consist of the diabatic potentials and the diabatic couplings) to analytic representations. Adiabatic potential energy surfaces are generated by diagonalizing the 3 × 3 diabatic potential energy matrix. The comparisons between the fitted and computed diabatic matrix elements and between the originally computed adiabatic potential energy surfaces and those generated from the fits indicate that the current fit is accurate enough for dynamical studies, and it may be used for quantal or semiclassical dynamics calculations.
Resonant absorption of incident electromagnetic waves in collisional inhomogeneous plasma slabs
Authors: Li Bowen , Nie Qiuyue , Wang Xiaogang , Wang Zhibin , Mao Aohua , Chen Peiqi
Published: September 2019

Resonant absorption is a process that electromagnetic (EM) energy is converted to plasma energy with a mode conversion on the resonant layer where the incident EM wave frequency equals to the local frequency of a plasma normal modes. With a finite collision between charged and background neutral particles in a plasma, the plasma oscillation is dissipated to widen the resonance layer and heat the plasma. In this work a modified scattering matrix methods (SMM) are applied to study the effects of the collision frequency, incident angle, and plasma thickness on resonant absorption. We analyze the energy absorption caused by resonance in comparison with collisional absorption for different parameters. It is found that the resonant absorption dissipates about nearly half of the incident EM energy in an overdense inhomogeneous plasma when the collision is weak, and the rest half portion is reflected. If the collision is strong, however, the collisional absorption is then more significant than the resonant and affects the entire wave propagation process.
Vicinal metal surfaces as potential catalysts for phosphorene epitaxial growth
Authors: Hashemi Daniel , Siegel Gene , Snure Michael , Badescu Stefan C.
Published: September 2019

Phosphorene, a single layer of black phosphorous (BLK-P), has significant potential for flexible and tunable electronics, but attempts to grow it epitaxially have been unsuccessful to date. Close-packed (111) surfaces of metals favor blue phosphorous (BL-P) over BLK-P due to the hexagonal symmetry of the former. Here, we investigate computationally the alternative offered by stepped substrates. Using the model of a Cu(311) surface, we find that surface steps can favor energetically BLK-P over BL-P. This can be rationalized in terms of surface density of states and orbital hybridization, which leads to a stronger surface bonding of BLK-P. This suggests that vicinal metal surfaces of metals can offer a viable path toward phosphorene synthesis.
Unsteady interaction of nanosecond surface sliding discharge with plane shock wave
Authors: Mursenkova I. V. , Kuznetsov A. Yu. , Sazonov A. S.
Published: September 2019

In this study, we present experimental results on fast intensified charge-coupled device imaging and current measurements of a nanosecond surface sliding discharge interacting with a plane shock wave in a shock tube. A shock wave with Mach number 1.9–3.5 passed through the discharge area while the electric pulse was switched on. The discharge is initiated by a voltage pulse of 25 kV; the discharge current is ∼1 kA. The discharge current in high-speed airflows including plane shock waves has been measured and the dynamics of the discharge radiation was studied with the nanosecond time resolution. It is shown that the inhomogeneity of the airflow-density field leads to a change in the discharge current and the structure of the discharge radiation strongly depending on the shock wave position in the discharge gap. The dynamics of the energy input is determined by the interaction of the shock wave with the discharge region, as measurements of the discharge current reveal.
Lateral cavity enabled Fabry-Perot microlasers from all-inorganic perovskites
Authors: Wang Ziming , Ren Yinjuan , Wang Yue , Gu Zhiyuan , Li Xiaoming , Sun Handong
Published: September 2019

Microlasers play an important role in the development of photonics and optoelectronics. As the rising star in the semiconductor family, all-inorganic lead halide perovskites (ILHPs) have been recognized as promising optical gain and lasing media. However, until now, achieving duplicable and single-mode microlasers remains a taunting challenge. Herein, we fabricated rectangular-shaped ILHP microsheets by the chemical vapor deposition method. The single-crystalline nature and the atomically smooth surfaces of the sample enable the achievement of lateral-cavity Fabry–Pérot (F-P) microlasers. Specifically, the lasing characteristics including the wavelength, mode spacing, and Q-factors can be well-reproduced along the axial direction of the individual microsheet. By regulating the width of the ILHP microsheet, the desirable single-longitudinal mode F-P microlaser was eventually achieved. Our results provide an enabling coherent light source for optics-related applications.
Researchers study autoresonance to control and excite large amplitude standing ion acoustic waves
Authors: Gasparini Allison
Published: September 2019

A group of researchers showed standing ion acoustic waves may be excited and controlled using a small chirped drive.
Incorporating quantum photonic sources and single-photon detectors onto a single chip
Authors: Bandari Anashe
Published: September 2019

Researchers made a high-efficiency single-photon detector on an integrated circuit with a quantum optical source.
Asymptotic behaviour of a boundary layer solution to a stationary partly dissipative system with a multiple root of the degenerate equation
Authors: Butuzov V. F.
Published: September 2019

We construct asymptotics with respect to a small parameter of a boundary layer solution of the boundary value problem for a system of two ordinary differential equations, one second order and the other first order, with a small parameter multiplying the derivatives in both equations. Systems of this type arise in chemical kinetics as stationary processes in models of fast reactions in the absence of diffusion for one of the reactants. An essential feature of the problem under study is a double root of one of the equations of the degenerate system. This leads to a qualitative change in the boundary layer component of the solution by comparison with the case when all the roots are simple. The boundary layer becomes multizoned, while the standard algorithm for constructing boundary layer series is no longer suitable and has to be replaced by a new one.

Bibliography: 13 titles.
Sufficient conditions for the stability of linear periodic impulsive differential equations
Authors: Bivziuk V. O. , Slyn’ko V. I.
Published: September 2019

Abstract linear periodic impulsive differential equations are considered. The impulse effect instants are assumed to satisfy the average dwell-time condition (the ADT condition). The stability problem is reduced to studying the stability of an auxiliary abstract impulsive differential equation. This is a perturbed periodic impulsive differential equation, which considerably simplifies the construction of a Lyapunov function. Sufficient conditions for the asymptotic stability of abstract linear periodic impulsive differential equations are obtained. It is shown that the ADT conditions lead to less conservative dwell-time estimates guaranteeing asymptotic stability.

Bibliography: 24 titles.
Nutritional implications of feeding reduced-protein diets to meat chickens
Authors: Hilliar M. , Swick R. A.
Published: September 2019

Global interest has emerged for the implementation of reduced-protein diets for meat chickens. The necessity of their development stems from environmental impacts and health and welfare concerns surrounding current meat-chicken production. Reduced crude-protein diets are possible with the increasing affordability of supplemental crystalline amino acids. Supplementing broiler feed with methionine, lysine and threonine is common practice in industry and has enabled a reduction of dietary crude protein to the levels currently used. However, further reduction of dietary protein often results in poor performance. Several nutritional options have been investigated with a focus on crystalline essential and non-essential amino acids such as glycine. However, reducing the crude protein of meat-chicken diets does change the ingredient and nutrient profile aside from the amino acid composition. Alterations in non-protein nitrogen concentrations, dietary electrolyte balance, minerals, fibre and carbohydrates, methyl-donors and polyphenols must be considered in formulations to ensure successful implementation of reduced-protein diets. The ability to maintain performance with reduced-protein diets may benefit sustainability and longevity of the meat-chicken industry.
Gonorrhoea: tackling the global epidemic in the era of rising antimicrobial resistance
Authors: Ong Jason J. , Wi Teodora , Hughes Gwenda , Williamson Deborah A. , Mayaud Philippe , Chow Eric P. F.
Published: September 2019

This Special Issue of Sexual Health aims to collate the latest evidence base focussed on understanding the current epidemic and transmission of gonorrhoea, choice of treatment, molecular epidemiology application, concerns about antimicrobial resistance and alternative prevention and control for gonorrhoea.
Conventional distance sampling versus strip transects and abundance indices for estimating abundance of greater gliders (Petauroides volans) and eastern ringtail possums (Pseudocheirus peregrinus)
Authors: Emerson Luke D. , Ballard Guy-Anthony , Vernes Karl
Published: September 2019

Abstract ContextAccurate estimates of abundance are extremely useful for wildlife management and conservation. Estimates generated from distance sampling are typically considered superior to strip transects and abundance indices, as the latter do not account for probability of detection, thereby risking significant error. AimTo compare density estimates generated from conventional distance sampling (CDS) of arboreal marsupials with strip transect density estimates and abundance indices. MethodsOff-track CDS and strip transects were used to estimate densities of P. volans and P. peregrinus across ~2.6km2 of remnant eucalypt forest at Mt Duval in north-eastern New South Wales. Key resultsCDS density estimates for P. volans (1.36ha−1, 95% confidence interval (CI) of 1.07–1.72ha−1) and P. peregrinus (0.28ha−1, 95% CI 0.22–0.35ha−1) were consistent with densities reported in other studies conducted in open eucalypt forests. A strip transect width of 40m for P. volans resulted in a collective set of values for density (1.35ha−1), error (s.e.±0.14), precision (cv 0.10) and 95% CI (1.07–1.62ha−1) closest to those associated with the CDS-generated density estimate (1.36ha−1, s.e.±0.15, cv 0.10, 95% CI 1.07–1.72ha−1). Strip widths of 10 to 40m resulted in density estimates for P. peregrinus closest to those generated through CDS, but much less precise. ConclusionsAlthough a 40-m wide strip transect provided a robust density estimate for P. volans at Mt Duval, this is unlikely to be consistent across different study areas. Strip transects provided less precise density estimates, or underestimated P. peregrinus density at Mt Duval, when compared with CDS density estimates. CDS should be favoured over strip transects or abundance indices for estimating P. volans and P. peregrinus abundance, because it is capable of providing more meaningful and robust abundance estimates by accounting for the probability of detection from the transect line across different habitats. ImplicationsResearchers, conservation managers and decision makers should be aware that common methods for assessing arboreal marsupial abundance have serious potential weaknesses. Thus, it would be prudent to invest in studies that address imperfect detection to improve the quality of monitoring data.
Predominant accumulation of a 3-hydroxy-γ-decalactone in the male rectal gland complex of the Japanese orange fly,Bactrocera tsuneonis
Authors: Ono Hajime , Nakahira Masataka , Ohno Satoshi , Otake Jun , Kanno Tomoya , Tokushima Isao , Higashiura Yoshimitsu , Nishi Ichiro , Nishida Ritsuo
Published: September 2019

The Japanese orange fly, Bactrocera tsuneonis, infests various citrus crops. While male pheromone components accumulated in the rectal glands are well characterized for Bactrocera, but information regarding the chemical factors involved in the life cycles of B. tsuneonis remains scarce. Herein, several volatile chemicals including a γ-decalactone, (3R,4R)-3-hydroxy-4-decanolide [(3R,4R)-HD], were identified as major components, along with acetamide and spiroketals as minor components in the rectal gland complexes of male B. tsuneonis flies. The lactone (3R,4R)-HD was also identified in female rectal gland complexes. The amount of this compound in mature males was significantly higher than those observed in females and immature males. The lactone (3R,4R)-HD was detected in flies fed with sucrose only, indicating that this lactone is not derived from dietary sources during adulthood, but biosynthesized in vivo. The predominant accumulation of (3R,4R)-HD in mature males also suggests a possible role in reproductive behavior.
Stories of how to give or take – towards a typology of social policy reform narratives
Authors: Blum Sonja , Kuhlmann Johanna
Published: September 2019

Narrative stories are crucial to policy change, as they decisively contribute to how policy problems and policies are defined. While this seems to apply for social policy in particular, narrative stories have remained under-researched and not systematically compared for this area. In this article, we theorise on narratives in social policy by focusing on how similarities and differences between narratives in old- and new-social-risks policy reforms can be conceptualised, taking into account expansion and retrenchment. To systematically link those types of social policy reform with narrative elements, we rely on stories of control and helplessness, as well as the deservingness or undeservingness associated with different target populations. Thereby, distinct types of social policy reform narratives are identified: stories of giving-to-give, giving-to-shape, taking-to-take, taking-to-control, and taking-out-of-helplessness. The article concludes with empirical illustrations of those narrative types, which stem from the case studies presented in this Special Issue.
Determination of representative features when building an extreme recognition algorithm
Authors: Fazilov Sh Kh , Mirzaev N M , Radjabov S S , Mirzaeva G R
Published: September 2019

The problems of determining the representative features when constructing an extremal pattern recognition algorithm defined in a high-dimensional feature space are considered. As an initial model, a model of recognition algorithms based on radial functions was considered. The procedures for extracting subsets of interrelated features and selecting a set of representative features when constructing an extremal algorithm within the framework of the recognition model under consideration are presented. The main idea of the first procedure is to form a set of features that are unrelated (or are connected rather weakly) among themselves. The essence of it is as follows. The studied subsets of features are combined into one subset if they are close enough to each other in a sense. Otherwise, they belong to different subsets. The main idea of the second procedure is to define a representative element in each subset of tightly coupled features. The choice of an element from the considered subset of tightly coupled features is made on the basis of an assessment of the proximity of features. It is required that among the selected set of features there should not be tightly coupled features. The main advantage of the proposed procedures is to improve the accuracy of the results of allocating subsets of tightly coupled features when building a recognition algorithm under conditions of large dimensionality of the feature space and determining the quantitative evaluation of these subsets. In order to assess the performance of the developed procedures, experimental studies were carried out. The application of the developed procedures allows to more accurately determine the unknown parameters of recognition operators in the space of features of large dimension.
About problems of decoding and searching for the maximum upper zero of discrete monotone functions
Authors: Kabulov A V , Normatov I H
Published: September 2019

This article explores the algorithms for solving individual classes of discrete extremal problems to find the exact optimum. When obtaining algorithms, the procedures for decoding and finding the maximum upper zero of discrete monotonic functions are used. Formulations of the tasks of decoding and searching for the maximum upper zero of discrete monotonic functions are formulated. To solve the problems of decoding and searching for the maximum upper zero of individual classes of 3-digit monotonic functions, estimates are given for the complexity of deciphering monotonic functions in a class.
Mathematical modeling regulatory mechanisms of a viral infection caused by hepatitis D virus with taking into account co-infection and super-infection
Authors: Saidalieva M , Hidirova M
Published: September 2019

The purpose of this paper is to develop mathematical and computer models for the regulatory mechanisms of the interconnected activity between liver cells, the hepatitis B virus and hepatitis D virus molecular-genetic systems at hepatitis D infectious process. The paper draws the results made by using methods of quantitative and qualitative analyse of functional-differential equations. The paper concludes that the developed model which has oscillatory mode, chaotic regime and destructive changes that can be identified by chronic hepatitis D with intermittent crisis, with severe hepatitis D and liver cirrhosis. The paper provides a new mathematical and computer models which are able to describe hepatitis D regulatory mechanisms and to diagnose the infectious process course and predict the outcome of disease.
Velocity analysis of a spherical parallel robot
Authors: Glazunov V A , Filippov G S , Rashoyan G V , Aleshin A K , Shalyukhin K A , Skvortsov S A , Antonov A V , Terekhova A N
Published: September 2019

A spherical mechanism of parallel structure containing three kinematic chains and performing spherical motions is presented. A distinctive feature of the architecture of the spherical mechanisms is the provision of the constancy of the position of the point – center of rotations. This characteristic causes a wide range of applications of these mechanisms. The kinematic analysis of the mechanism is based on the differentiation of the coupling equations imposed by the kinematic chains. As a result of differentiation, a matrix is obtained by means of which it is possible to solve the direct and inverse problems of kinematics. The velocity analysis is necessary to control the robot and its dynamic analysis.
Complex approach to the optimal energy efficient work pattern for vibratory roller
Authors: Mikheyev V V , Saveliev S V , Permyakov V B
Published: September 2019

Soil compaction of fills performed by surface force is a process of key importance for road construction. Road rollers represent the most widespread type of compactors. Improvement of both quality of compaction and output of roller is technological problem of great interest. The key point for its solution is optimal choice of combination of parameters which determine the force causing plastic deformation of the soil layer. Theoretical consideration of the process is given in the framework of interaction between massive elastoviscoplastic region of soil layer and source of external surface force. It naturally produces resonance criterion for the energy effective compaction. Minimum value of mechanical resonance in respect to external force allows to find the combination of working regime parameters for the given type of roller. Results of experiments involving sandy loam and clay loam proved the results of numerical modeling and gave key for recommendations on combined speed-frequency energy effective regime of compaction for given types of soils by smooth drum vibratory roller.
Analysis of datum schemes for multi-faceted cutting inserts in cutting
Authors: Vasilyev E V , Zakharova N V , Abakumov A N , Popov P E
Published: September 2019

Renovation of multi-faceted carbide inserts is one of the important problems of tool-making. One of the problems of tool renovation is its datum. Taking into account the volume of the tool, it is necessary to ensure not only its datum accuracy, but also the ability to automate the recovery process. Various mounting modes of multi-faceted carbide inserts are considered, and the method providing the maximum accuracy of datum and quick-release is proposed.
Consideration of Socium as Mechanical System with Stream Control
Authors: Florensov A N , Gritsay A S
Published: September 2019

Mathematical modeling of socium as mechanical system with the material components determined by parts of system with qualitatively excellent complexes of properties concerning production, storage and consumption of production is considered. Existence of objectively operating feedback in the representing system is established. The mathematical model formed in work appears the nonlinear system of the ordinary differential equations and is far-reaching expansion of classical models Lotka and Volterra. The mathematical analysis shows existence of a fixed point in phase space of solutions of system and gives for her analytical expressions. Results of private numerical modeling of the offered model are presented. Results of modeling show manifestations of difficult oscillatory dynamics of phase trajectories of the solution of system and serve as an essential argument of an explanation of real oscillatory processes in the history of social systems.
Setting and solving the game confrontation problem of the hardware-redundant dynamic system with an attacking enemy operating under incomplete information in the conflict process
Authors: Potapov V I , Gritsay A S , Chervenchuk I V , Makarov V V , Kuznetsova O P , Kondratukova L K
Published: September 2019

The game task of confrontation of the attacked hardware-redundant dynamic system with an attacking enemy operating in conditions of incomplete information about the behavior of the attacked enemy in the process of conflict was posed and solved numerically and analytically.

The attacking party aspires to increase the intensity of the failures of the components of the attacked system at the expense of its attack resources, up to its total failure. The attacked party, due to the corresponding strategy of redistribution of reserve blocks of the hardware-redundant dynamic system between the failed main blocks at the appropriate instants of time, strives to maximize the probability of failure-free operation of the attacked system at the end of the confrontation (game) with the attacking enemy.

Behavior of the system under attack in the process of conflict is approximated by the Markov process, and the number of operable states is equal to the number of failed functional blocks that do not exceed the number of standby blocks. As a payment function in the game in question, the probability of failure-free operation of the attacked system is used by the time the game ends. The solution of the game is the vector of the system setup moments after the corresponding failures of the functional blocks and the set of reservation vectors corresponding to the instantaneous settings of the system being attacked, which maximizes the probability of system failure during the conflict.

The differential game model is reduced to a multi-step matrix model with given probabilities of the states of the attacking enemy. Numerical algorithms for calculating the vector of reservation for the attacked system that maximizes the probability of its trouble-free operation by the end of the game and for solving the game problem in question are presented in a form convenient for implementation on a personal computer.
Biometric authentication on the basis of lectroencephalograms parameters
Authors: Sulavko A E , Samotuga A E , Stadnikov D G , Pasenchuk V A , Zhumazhanova S S
Published: September 2019

Static biometric patterns such as fingerprint, iris and face are difficult to keep secret. Since the open pattern has a little potential replacement options stealing a strange open biometrics provides great opportunities for compromising systems. Authentication on the basis of electroencephalogram pattern (EEG) is the most secure kind of biometric security. The present study aims to develop a method of biometric authentication by the EEG data with high accuracy. Several neural network EEG pattern verification algorithms have been tested. A method for verification of the human EEG pattern based on a modified Bayes hypothesis formula has been developed. The following error indicators FAR <10-4 with FRR = 0.062 were achieved.

This work was supported by the Russian Foundation for Basic Research (RFBR) and the Government of the Omsk Region (grant 18-41-550002).
Equipment desing automation at asphalt-concrete production modernization
Authors: Belyaev P S , Frolov V A , Trapeznikov E V , Belyaev V P , Makeev P V , Shashkov I V
Published: September 2019

The relevant task in the field of road construction and maintenance is gradual transition to the production of asphalt-concrete mixtures on polymer-bitumen binders. Most asphalt-concrete plants of small and medium capacity consider this transition as challenging due to a relatively high cost of the specialized equipment for polymer-bitumen binders production. Most proposed techniques involve the utilization of colloid mills. The practice of such mills operation shows that production lines experience long downtime periods due to the necessity of preventive maintenance and repair. A promising direction in polymer-bitumen binders manufacture is to use polymer waste materials for the bitumen modification. This provides the reduction of the modified binder costs and the solution of environmental problems. The paper deals with the problem of asphalt-concrete plants modernization to obtain polymer-bitumen binders in its own production using agitated mixers common in the chemical industry. Optimization problem is formulated for design and operating parameters of such equipment to provide required quality indicators for the resulting polymer-bitumen binders. Algorithmic and software assistance is developed to solve the set problem. The proposed technical solutions were tested when solving the modernization problems regarding the process diagram of the asphalt-concrete plant to release products on polymer-bitumen binder of its own production.
Data measuring system to determine the solvent diffusion coefficient in products from capillary-porous materials
Authors: Belyaev V P , Varepo L G , Belyaev P S , Divin A G
Published: September 2019

The development of methods and means for non-destructive product testing is the current task of modern instrument-making in the study field of porous materials ability to transport the substances distributed in a solid phase. They allow one to determine the characteristics of mass transfer directly in the finished product, because they do not require the preparation of special samples of a given configuration and size, typical for most of the used methods and devices. The aim of this study is to develop data measuring system that improves the performance of studies of polar solvents diffusion in porous media. The data measuring system is designed to implement methods of the solvents diffusion coefficient control in fine and bulk products from isotropic and anisotropic porous materials with one-way access to flat surfaces of specified size products. The schematic of the data measuring system, virtual surface for experiment control, the flow chart for the measurement operations of the developed methods, the results of testing the system are given.
Strength and geometry parameters accuracy improvement of 3D-printed polymer gears
Authors: Glukchov V I , Varepo L G , Nagornova I V , Doronin F A
Published: September 2019

The study is concentrated on the topic of 3D-printed polymer gears quality improving issues in terms of both mechanical strength and geometric precisionat the production by FDM process. The conception of gears radial 3D-printing based on functional dimensional communications modelling between the basic and gear elements by string-mesh structure forming of even- and uneven numbered layers; printing gear layers are represented as stretched string system, pairwise and symmetrical placed related to the reference hole axis. Tangential dimensional communication of bidirectional tangent lines to generating circle was applied to the evolvement gears profiles forming. Formation of the gears tooth root on the basic circle accompanied with string-mesh layer structure forming will provide quality gears improvement.
Advanced morphological approach to finding novel solutions for automated finishing of GTE blades
Authors: Kondrat’ev I M , Rakov D L
Published: September 2019

This article deals with the search, structural analysis, synthesis and modelling of complex automatic systems during preliminary design phase on a basis of advanced morphological approach. The research aims were to develop and use an advanced morphological approach, a technique for modelling the new systems for automated finishing of gas turbine engine (GTE) blades. The approach is based on cluster analysis, set theory, set of rules and maximization a gain by the innovative automation systems potential. Based on this study, the proposed method shows a meaningful potential compared to the methods presently used.
The Appliance of Deep Neural Networks in the Process of Managing Chemical Enterprises
Authors: Kulyasova E V , Kulyasov N S , Yu Puchkov A
Published: September 2019

This article is introduced into the perspective tendencies of the digital transformation of chemical enterprises which allow to improve the process of managing enterprises of the branch. Presented the algorithms of managing and technological information processing based on deep neural network apparatus. New approaches to data processing known as video analytics are applied; it allows to automate the registration process of visual data at chemical enterprises and reduce the impact of the human factor on the objectivity of the decisions. The worked out algorithmic structures of managing and technological information processing allows to carry out the identification of hidden regularities there and ensure the effective achievement of goals at chemical enterprises.
Cache-aware algorithm for multidimensional correlations
Authors: Altman E A , Vaseeva T V , Aleksandrov A V
Published: September 2019

In the paper discusses a speed of a convolution or correlation functions in case of a big size of input data. When a data volume exceeds a cache size, a significant part of an execution time is spent on a loading data into the cache. A performance of correlation is explored an example of receiving a long radio signal by the use of comparison with a big number of patterns. To decrease this spending a method of reordering calculation and memory operations and is proposed. The method uses cache aware approach to construct cache friendly algorithms. A decreasing of execution time (in some case) achieves up to 44%
The influence of thermal contact between medium on the surface waves propagation in a prestressed thermoelastic layered half-space
Authors: Yu Levi G , Belyankova T I
Published: September 2019

In the framework of the linearized theory of the propagation of thermoelastic waves, a dynamic mixed coupled problem on the oscillations of an inhomogeneous medium under the action of a thermal load oscillating on its surface is considered. The medium is a thermoelastic prestressed layer rigidly coupled with a thermoelastic prestressed half-space. At the boundary of the medium, two types of thermal conditions are considered: ideal thermal contact and heat insulation. Using operational calculus methods, the boundary value problem with mixed thermal boundary conditions is reduced to an integral equation of the first kind with respect to the unknown distribution function of the heat flux in the contact zone. We studied the distribution of the poles of the Green’s function of a medium, taking into account the effect of initial strains and preheating. It is shown that thermal conditions at the interface between the medium have little effect on the distribution of the vertical displacement of the layer surface in the natural state. At the same time, the condition of thermal insulation between the layer and half-space allows to compensate for the effect of body pre-heating on the formation of the surface wave field.
Multisection heat exchangers for heat utilization of the waste gases from heat power plants
Authors: Yanvarev I A , Yu Grokhotov V
Published: September 2019

Improving the efficiency of fuel and energy resources in operating heat power plants is an important and relevant direction in the engineering development of various industries. A comprehensive solution to the problems arising as a result can be achieved, including the use of a step-by-step heat exchange process, which can be implemented in multisection heat exchangers for the utilization of the waste gases heat.
Tensile strength analysis of friction stir welded joints of AlMg6 obtained using additional heating of the parts
Authors: Chernykh I K , Vasil’ev E V , Sergeev V A , Popov P E
Published: September 2019

During friction stir welding a structure of a material in the welding zone undergoes significant changes: recrystallization occurs with the formation of three different zones: the weld nugget zone, thermomechanically affected zone and heat affected zone. It is known that a significant change in microstructure that observes on the boundaries between the above mentioned zones creates dangerous areas in the weld, and when testing specimens the fracture mostly occurs in these areas. In this study, the tensile strength analysis of friction stir welded joints of aluminum plates of AlMg6 of 3.85 mm thickness obtained using additional heating of the parts was conducted. The macrostructure of the welds was investigated; the fracture line of specimens is shown; the reasons that lead to decrease in durability of welds are identified. The tensile strength of welded joints amounted to 85-93% of the tensile strength of the base metal.
Cleaning of technical oils by powder filter materials
Authors: Ilyushchanka A , Charniak I , Kusin A , Kusin R , Zakreuski I , Eremin E
Published: September 2019

The results of the study of powder filter materials (PFM) in comparison with the serial net and paper filter elements used for oil cleaning are given, as well as the effectiveness of their use for cleaning technical oil is substantiated. The possibility of promising use of powder filter material for cleaning engine oil is shown. As an example of the effective use of powder filter material, an example is given of oil cleaning in the process of engine running. A tangential filtration device for used engine oil is described. In the process of research, the range of fineness of cleaning motor oil with powder filter materials ranged from 5 to 70 microns.
Influence of the Arctic climate on watering of engine oils in operating conditions of road transport
Authors: Kolunin A V , Bur’yan I A , Gel’ver S A
Published: September 2019

A characteristic feature of the Arctic climate is negative temperatures. They have a negative impact on the condition of the equipment. The engine is the least adapted unit for the use in such conditions. The lubrication system of the engine undergoes significant state changes. The changes include the reduction of the operational properties of engine oils and the formation of buttery sediments, which block the grids of oil receivers, oil filters and violate the permeability of oil lines. The factor of watering in low-temperature sedimentation is of paramount importance. The water in the crankcase is formed as a result of condensation processes when operating at low temperature.
Ultra-high-speed sharpening and hardening the coating of carbide metal-cutting tools for finishing aircraft parts made of titanium alloys
Authors: Rechenko D S , Popov A Y , Titov Yu V , Balova D G , Gritsenko B P
Published: September 2019

The work is devoted to the creation of a hard-alloy tool for finishing processing of heat-resistant and titanium alloys. Objective: to increase the efficiency of carbide blade tools for finishing machining of aircraft parts of heat-resistant and titanium alloys by means of ultrafast grinding, to determine the method of hardening the cutting part and the conditions of its operation. Subject of the research: the quality of the cutting wedge (conditional inscribed radius of the blade rounding, the presence of microchips, blockages and microhardness) obtained by ultrafast grinding and work-hardening of the cutting part and the determination of the conditions of its operation. Objectives: to implement the method of carbide tools ultrafast sharpening, providing the required quality of the cutting wedge, characterized by the conditional inscribed radius of rounding of the blade, the presence of microchips, blockages and microhardness, capable of producing blade processing of parts from heat-resistant and titanium alloys with an accuracy of 3…5 microns and roughness of Ra 0.2…0.4 microns; to investigate the process of superfast sharpening and to determine the effect of sharpening modes of carbide metal cutting tools on the quality of the sharpened tools cutting wedge; to investigate the reason for the reduction of the durability of the cutting tool while reducing the rounding radius of the blade and to determine the composition of the hardening coating, which slightly reduces the sharpness of the blade; to investigate the influence of cutting modes of finishing heat-resistant and titanium alloys with a tool blade sharpness up to 5 microns on its durability, as well as the surface roughness and accuracy of the part. Research methods: electron microscopy (Jeol JCM-5700, an energy-dispersive spectrometer attachment JED-2300; NTEGRA PRIMA (NT-MDT)); optical microscopy (MikroCad Premium, ODSCAD measurement program; Axio Observer.A1m); vibrodynamic analyzer (DIANA-2M); coating thickness measurement method (Calotest CAT-S-0000); microhardness measurement method (PMT-3 and DM 8 B AFFRI); determination of the characteristics of the tribotechnical properties by the method of testing for friction and wear (II5018); determination of cooling capacity (Compaton). Theoretical and calculation methods: simulation method; end element method; methods of mathematical statistics.
Simulation of the process of creep-feed diamond grinding of hardmetals
Authors: Vasil’ev E V , Rechenko D S , Yu Popov A , Garifullina E V , Chernykh I K
Published: September 2019

To determine the efficiency of diamond grinding of hardmetals, which is characterized by specific metal removal rate, it is necessary to determine the volume of chip removed by the one grain taking into consideration it’s curvilinear. A scheme for calculating the chip area in the longitudinal cross section with taking into consideration of its curvilinear was developed. According to the obtained equations, the volume of chips removed was determined, which provide a way to calculate the maximum force acting on the grain with higher accuracy. Comparative analysis of the motion trajectory of the grain obtained by the simulation in SolidWorks and by the calculating using the equations showed that the error between the coordinates no more than 2%.
Research of strength and conducting properties of composite material modified by carbon nanotubes
Authors: Zaporotskova I , Elbakyan L , Bakhracheva Yu
Published: September 2019

The article studies the fabrication mechanism of semiconducting composite polymer material based on methyl methacrylate, butyl methacrylate and methacrylic acid co-polymer doped with carbon nanotubes (CNT). A mechanism for fabrication of composite polymer material modified with carbon nanotubes has been developed, and experimental studies of the strength, electrical and physical characteristics of the materials obtained have been carried out.
The task of pursuing objects moving on different surfaces
Authors: Dubanov A A , Ausheev T V , Semenov D A
Published: September 2019

The purpose of this article is to describe a mathematical model of the pursuit problem in the case when the pursued and pursuing objects move along different surfaces one above the other. Orthonormal dynamic bases, which are determined by the vectors of velocities and normals to the surfaces, are introduced on the surfaces under consideration, at the points where objects are located, and tangent planes are constructed. The coordinates of our model’s opponent are projected onto each specified plane for analysis and decision making. The velocities of the objects in the model are constant in magnitude. The inertness of objects is modeled using the angular velocity of rotation, which is essential in the described model. As a result of research, an iterative algorithm was obtained, which leads to the achievement of a threshold value in the horizontal plane of projections. According to the research results, a dynamic visualization of the pursuit task was made, which gave clarity to the results obtained.
Morphisms general properties of geometrical models
Authors: Kuchkarova D F , Achilova D A
Published: September 2019

The notion “modeling” is one of the most significant in modern science. At present the approach is dominating, under which the model is understood as a set of given collection of relations in it.

It is supposed that some abstraction of identification exists allowing to identify a real object with artificially created model; for all that it is more often used isomorphism and homomorphism for the relation identification. With the notion ‘modeling’ a principally new method of scientific knowledge is used that is the ‘mathematical experiment’, taking an intermediate place between ‘classical deductive and classical experimental research methods’. Under mathematical model of a concrete object it is understood combination of equations, inequalities and other limitations and conditions for their solving, that allow in created system of co-ordinates to identify the object with the only method. Any object, except mathematical one, can have other models: geometrical, graphical, digital, linguistic and so on. Sequence of transformation of geometrical model into mathematical one and then into digital one is the sequence of homomorphism. While modeling we compare it not only with mathematical similar object i.e. the model, but with theoretical conception as well as with other suitable objects for this conception. It is shown in this article the primary geometrical model in relation to mathematical one. and the definition of geometrical modeling is given . The necessary definitions of isomorphism and homomorphism models are represented as well as examples of relations between concrete objects and their models. Definitions of full geometrical model, its complexity degrees and conditions of two models equivalence are also given.