bluuebunny/crossref_metadata_2025 huggingface dataset:
The effects of microcomputer-based laboratories on students macro, micro, and symbolic representations when learning about net ionic reactions
Authors: Ye Jianqiang , Lu Shanshan , Bi Hualin
Published: November 2018

This study uses graphs of conductivity measured by a microcomputer-based laboratory (MBL) to promote students’ macro, micro, and symbolic representations when learning about net ionic reactions (NIR). A total of 54 students, aged 14–15 years old participated in this research, and were randomly divided into an experimental group (N= 27) and a control group (N= 27). The students in the experimental group were given graphs of conductivity measured by MBL, while the control group had a demonstration of acid–base titration experiments. The results reveal that the graphs of conductivity have a large effect on students’ macro, micro, and symbolic representations, that is, the students in the experimental group build more representations than the students in the control group.
Mechanics of an adhesive tape in a zero degree peel test: effect of large deformation and material nonlinearity
Authors: Hui Chung-Yuen , Liu Zezhou , Minsky Helen , Creton Costantino , Ciccotti Matteo
Published: November 2018

The common pressure sensitive adhesive (PSA) tape is a composite consisting of a stiff backing layer and a soft adhesive layer.
Selective atomic layer deposition of RuOx catalysts on shape-controlled Pd nanocrystals with significantly enhanced hydrogen evolution activity
Authors: Zhang Lei , Zhao Zhi-Jian , Norouzi Banis Mohammad , Li Lulu , Zhao Yang , Song Zhongxin , Wang Zhiqiang , Sham Tsun-Kong , Li Ruying , Zheng Matthew , Gong Jinlong , Sun Xueliang
Published: November 2018

Octahedral Pd@RuOx/NCNT catalysts are achieved through atomic layer deposition, and exhibit comparable activity with Pt/C for hydrogen evolution reaction.
Ti3C2Tx(T = F, OH) MXene nanosheets: conductive 2D catalysts for ambient electrohydrogenation of N2to NH3
Authors: Zhao Jinxiu , Zhang Lei , Xie Xiao-Ying , Li Xianghong , Ma Yongjun , Liu Qian , Fang Wei-Hai , Shi Xifeng , Cui Ganglong , Sun Xuping
Published: November 2018

Conductive Ti3C2Tx(T = F, OH) MXene nanosheets act as efficient 2D catalysts for ambient electrohydrogenation of N2to NH3.
Lithium-containing biomaterials inhibit osteoclastogenesis of macrophagesin vitroand osteolysisin vivo
Authors: Pan Chenhao , Chen Lei , Wu Ruoyu , Shan Haojie , Zhou Zubin , Lin Yiwei , Yu Xiaowei , Yan Liang , Wu Chengtie
Published: November 2018

Li-containing bioceramics were promising biomaterials for inhibiting osteoclastogenesis of macrophages and osteolysisin vivo, potentially using for treating osteoporosis.
Constructing a donor–acceptor linear-conjugation structure for heterologous perylene diimides to greatly improve the photovoltaic performance
Authors: Wang Helin , Chen Lingcheng , Xiao Yi
Published: November 2018

Th-4PDI, a new donor–acceptor-type non-fullerene electron acceptor material, was designed and synthesized for high efficiency organic solar cells.
Solution uniqueness of convex piecewise affine functions based optimization with applications to constrained ℓ1 minimization
Authors: Mousavi Seyedahmad , Shen Jinglai
Published: November 2018

In this paper, we study the solution uniqueness of an individual feasible vector of a class of convex optimization problems involving convex piecewise affine functions and subject to general polyhedral constraints. This class of problems incorporates many important polyhedral constrained ℓ1 recovery problems arising from sparse optimization, such as basis pursuit, LASSO, and basis pursuit denoising, as well as polyhedral gauge recovery. By leveraging the max-formulation of convex piecewise affine functions and convex analysis tools, we develop dual variables based necessary and sufficient uniqueness conditions via simple and yet unifying approaches; these conditions are applied to a wide range of ℓ1 minimization problems under possible polyhedral constraints. An effective linear program based scheme is proposed to verify solution uniqueness conditions. The results obtained in this paper not only recover the known solution uniqueness conditions in the literature by removing restrictive assumptions but also yield new uniqueness conditions for much broader constrained ℓ1-minimization problems.
A weakly convergent fully inexact Douglas-Rachford method with relative error tolerance
Authors: Fux Svaiter Benar
Published: November 2018

Douglas-Rachford method is a splitting algorithm for finding a zero of the sum of two maximal monotone operators. Each of its iterations requires the sequential solution of two proximal subproblems. The aim of this work is to present a fully inexact version of Douglas-Rachford method wherein both proximal subproblems are solved approximately within a relative error tolerance. We also present a semi-inexact variant in which the first subproblem is solved exactly and the second one inexactly. We prove that both methods generate sequences weakly convergent to the solution of the underlying inclusion problem, if any.
Analysis of the Conditions for the Radio Waves Propagation in the Waveguide “Earth-Ionosphere” on the Paths “Novosibirsk-Ulan-Ude” and “Komsomolsk-on-Amur-Ulan-Ude” During Magnetic Storms August 31-September 12, 2017
Authors: Bashkuev Yuri , Advokatov Victor , Buyanova Darima , Pushkarev Mikhail
Published: November 2018

In order to analyze the radio waves propagation conditions in non-uniform impedance channels, the amplitude and additional phase of the electromagnetic field of the VLF radio navigation system RSDN-20 were measured. The radio paths of latitudinal strike have been studied: path 1 “Novosibirsk - Ulan-Ude”, the length is 1580 km; path 2 “Komsomolsk-on-Amur - Ulan-Ude”, the length is 2080 km. The daily variations of the amplitude and the additional phase of the 11.9 and 14.88 kHz radio signals are considered.
Comparison between two different quantum models of ball lightning
Authors: Kuznetsov Vladimir
Published: November 2018

Two models of ball lightning are compared here. Each model is quantum. One of them was proposed by American and Finnish physics [1], who were the first to create three-dimensional skyrmions – particles in Bose- Einstein condensate with an ordered spin structure where central and boundary spins are opposite directed. A stable knot between electric and magnetic fields in a three-dimensional skyrmion is treated by the authors as a quantum model of ball lightning (BL). The next model proposed here proceeds from quantum entanglement (QE) of protons in hydrogen bonds (HBP) inside atmosphere oversaturated water vapour [2]. Two other quantum models issued in 1937 and 2007 are mentioned here. Origin of high-energy particles flux inside clouds as conditions for its origin when dark lightning [3] precede ordinary one creating additional ionization, fluxes of fast electrons with MeV energy prior to lightning which is initiating BL, glow, sprites are considered. All phenomena listed above appear to be of general nature resulting from QE of HBP in overstable water clusters (tetramers) inside clouds. Comparing models introduced above we use the estimation of BL capacity to enter via glass as a key parameter. Unexplained in BL models this frequently observed phenomenon as well as many other such as the BL transparency, its coldness and hiss become obviously explicable in the context of our model.
Strong variations of gamma-ray and atmospheric electric field during various meteorological conditions by observations in Yakutsk and Tiksi
Authors: Toropov Anatoliy , Starodubtzev Sergey , Kozlov Vladimir
Published: November 2018

The results of a study strong increase in gamma-ray background in the surface layer of the atmosphere during precipitation and near thunderstorms in Yakutsk (based on the Cosmic Ray Spectrometer of the Institute of Cosmic Rays of the Siberian Branch of the Russian Academy of Sciences) and Tiksi (Polar Geospace Observatory of the IKFIA SB RAS) are present in this paper. Scintillation detectors based on NaI (Tl) crystals with a size of 63mm x 63mm are used to register gammaray . The range of measured energies is 20-1900 keV. Detectors are closed from the sides and from below with lead (5 cm) and placed in thermoboxes having a glass window. Both of the detectors are located on the roof of buildings in Yakutsk and Tiksi. Also, synchronous registration of variations of the atmospheric electric field, (electrostatic fluxmeters Boltek EFM-100) and main meteorological parameters of the atmosphere (ultrasonic weather station AMK-04). An explicit relationship was found between the increase in the background gamma-ray and heavy rainfall. The energy spectra of the gamma background are obtained under “good” weather conditions and during heavy precipitation and near thunderstorms. The carried out researches allow to consider that the increase of the gamma background is connected, first of all, with the emission of radon and its daughter products from the ground and, to a lesser extent, with bremsstrahlung of charged particles in strong electric fields of a thunderstorm atmosphere.
Markov chain as a tool for forecasting daily precipitation in the vicinity of the city of Bydgoszcz, Poland
Authors: Bojar Waldemar , Knopik Leszek , Żarski Jacek , Kuśmierek-Tomaszewska Renata , Żarski Wojciech
Published: November 2018

The crop yield depends on numerous weather factors, but mainly on the rainfall pattern and course of air temperature during vegetation period. Investigating the dependence of yields on rainfall, apart from its amount, there also should be taken into account dry spell periods. The two-state Markov chain was considered as a precipitation pattern in the investigation, since it is generally recognized as a simple and effective model of the precipitation occurrence. Based on the daily precipitation totals from the period 1971—2013, the Markov chain was designated. The data were derived from a measuring point of the University of Science and Technology in Bydgoszcz, Poland. As one of the objectives was to determine the order of the Markov chain examined describing the change of precipitation in subsequent days. Another aim was to investigate rainfall dependencies on a month of a year. An analysis of this data leads to the conclusion that the chain is second order. This is confirmed by the two criteria used: BIC (Bayesian Information Criteria) and AIC (Akaike Information Criteria). The research regarded the precipitation volume dependence on a month of the year.
Statistical analysis of daily precipitation in the Bydgoszcz region
Authors: Bojar Waldemar , Knopik Leszek , Kuśmierek-Tomaszewska Renata , Żarski Jacek , Żarski Wojciech
Published: November 2018

The aim of the research has been to provide a statistical analysis of precipitation in the Bydgoszcz region based on the results of the measurements taken at the Experiment Station of the UTP University of Science and Technology in Bydgoszcz, located at Mochle, about 20 km away from the city centre. The paper analyses the daily total precipitation throughout 43 years (1971—2013). The analysis demonstrated a high dependence of the indicators studied on the month, confirming the annual pattern typical for the transitional climate of the temperate zone. In general, it shows an advantage of the amount and variation, and less considerably — the daily precipitation frequency in summer months, as compared with the winter months. The distribution of the probability of the daily precipitation amount for each month turned out to be compliant with gamma distribution, which allows for a potential variation in the future.
Estimation of the occurrence of drought in Poland by 2060 based on the HTC index and probability distributions
Authors: Diakowska Ewa , Stanek Paulina , Iwański Sławomir , Gąsiorek Edward
Published: November 2018

This article attempts to assess the future occurrence of a drought using the Sieljaninova hydrothermal index (HTC). Air temperature and total precipitation were simulated for current conditions (2000) and forecast for eight locations of meteorological stations in Poland according to the HAD and GFDL scenarios for RCP 45 and 60 for 2040 and 2060.
Model-based electrospinning process design for nanofibers production
Authors: Drąg Marlena , Drąg Paweł
Published: November 2018

The main concept of the electrospinning process modeling is to overcome difficulties associated with the experimental-based optimization procedure. Thus, 3-dimensional polynomial models were discussed in this work. Electrospinning process modeling is an approach that supplies the information about wanted concentrations of the electrospinning solution components and will also make it possible to obtain bead-free nonwovens with desired fiber diameter. The application area for described methodology is highly associated with the environmental field of study, where the design of the functionalized nanofibers production is extremely requested (e.g. separation, filtration and purification processes).
Applying of depth-averaged hydrodynamic modeling with different methods of turbulence closure for flow near channel groyne. Part II – Analysis of simulation
Authors: Ewertowski Ryszard
Published: November 2018

Training structures in flow stream play an important role in shaping flow and bed properties. To investigate consequences of introducing training elements like groins or dikes into the river stream one can successfully use numerical modelling. This paper is the second part of the research concentrated on utilizing some hydrodynamic models for resolving the problem. In the first part some hydrodynamic background has been described and here the analysis of applying two-dimensional depth-averaged model for straight rectangular channel with a groyne is discussed. Three models of eddy viscosity were applied to investigate their influence on results of simulation and to attempt choosing the most suitable method of modelling the flow phenomena around the groin. Results of simulation in steady flow conditions show that from the hydrodynamic point of view the more profitable method of turbulence description is the mixed-length or even the parabolic method instead of the broadly suggested k-e model. They allow producing the most reliable vortexes in the shear layer of flow behind the training structure end well preserve the mass balance contrary to the results obtained with k-e model of eddy viscosity.
Filling missing meteorological data with Computational Intelligence methods
Authors: Kajewska-Szkudlarek Joanna , Stańczyk Justyna
Published: November 2018

Estimates of temperature and humidity values at a specific time of day, from hourly to monthly profiles, are needed for a number of environmental, ecological, agricultural and technical applications, ranging from natural hazards assessments, crop growth forecasting to designing solar energy systems. In climatology, they constitute the basis for drawing conclusions about climate variability. Data used in such analyses should be complete and reliable. Therefore, effective methods for filling missing values are sought. The initial scope of this research is to investigate the efficiency of computational intelligence methods in filling missing daily temperature and humidity parameters values. For this reason, a number of experiments have been conducted with Artificial Neural Networks and Support Vector Regression using meteorological data from the city of Wroclaw in Poland. The performance of these methods has been evaluated using standard statistical indicators, such as Correlation Coefficient and Root Mean Squared Error. Finally, certain computational intelligence techniques are proposed that can be used to predict daily temperature and humidity values more accurately in order to fill the missing data.
The study and comparison of one-dimensional kernel estimators – a new approach. Part 1. Theory and methods
Authors: Karczewski Maciej , Michalski Andrzej
Published: November 2018

In this article we compare and examine the effectiveness of different kernel density estimates for some experimental data. For a given random sample X1, X2, …, Xn we present eight kernel estimators fn of the density function f with the Gaussian kernel and with the kernel given by Epanechnikov [1] using several methods: Silverman’s rule of thumb, the Sheather–Jones method, cross-validation methods, and other better-known plug-in methods [2–5]. To assess the effectiveness of the considered estimators and their similarity, we applied a distance measure for measurable and integrable functions [6]. All numerical calculations were performed for a set of experimental data recording groundwater level at a land reclamation facility (cf. [7–8]). The goal of the paper is to present a method that allows the study of local properties of the examined kernel estimators.
Comparative analysis of the effectiveness of the conceptual rainfall-runoff hydrological models on the selected rivers in Odra and Vistula basins
Authors: Mańko Robert , Laskowski Norbert
Published: November 2018

Identification of physical processes occurred in the watershed is one of the main tasks in hydrology. Currently the most efficient hydrological processes describing and forecasting tool are mathematical models. They can be defined as a mathematical description of relations between specified attributes of analysed object. It can be presented by: graphs, arrays, equations describing functioning of the object etc. With reference to watershed a mathematical model is commonly defined as a mathematical and logical relations, which evaluate quantitative dependencies between runoff characteristics and factors, which create it. Many rainfall-runoff linear reservoirs conceptual models have been developed over the years. The comparison of effectiveness of Single Linear Reservoir model, Nash model, Diskin model and Wackermann model is presented in this article.
Automatic quality control of telemetric rain gauge data for operational applications at IMGW-PIB
Authors: Otop Irena , Szturc Jan , Ośródka Katarzyna , Djaków Piotr
Published: November 2018

The automatic procedure of real-time quality control (QC) of telemetric rain gauge measurements (G) has been developed to produce quantitative precipitation estimates mainly for the needs of operational hydrology. The developed QC procedure consists of several tests: gross error detection, a range check, a spatial consistency check, a temporal consistency check, and a radar and satellite conformity check. The output of the procedure applied in real-time is quality index QI(G) that quantitatively characterised quality of each individual measurement. The QC procedure has been implemented into operational work at the Institute of Meteorology and Water Management since 2016. However, some elements of the procedure are still under development and can be improved based on the results and experience collected after about two years of real-time work on network of telemetric rain gauges
Probabilistic approach in the heavy rainfall modelling – is model verification needed?
Authors: Wdowikowski Marcin , Kaźmierczak Bartosz , Wartalska Katarzyna
Published: November 2018

The aim of this paper is an attempt to answer the question whether it is necessary to update the probabilistic model of heavy rainfall with the passage of time. Based on IMWM-NRI measurement data in Wroclaw, probabilistic models for data from 1960–2009 with data up to 2017 were compared. The analysis showed that intense rainfall recorded in recent years can significantly affect the course of the depth-duration-frequency (DDF) model.
Ways to reduce the error of additive methods of forming
Authors: Grechukhin Alexander N. , Kuts Vadim V. , Razumov Michail S.
Published: November 2018

The article is devoted to the investigation of the surface layer formation accuracy of engineering products by additive methods. The analysis of advantages and disadvantages of layered products synthesis technologies was carried out. It was revealed that, in additive shaping, the exact characteristics of the surface layer differ significantly from the accuracy characteristics of the surface layer of products obtained by the traditional methods. The analysis of domestic and foreign works on the topic of research was carried out. It is revealed that to increase the accuracy characteristics of products obtained by additive methods, it is necessary to realize dynamically the spatial orientation of the working element of the additive installation in the process of shaping. To control the spatial orientation of the working organ of additive equipment, a method is proposed. The proposed methodology will allow to calculate the controlled parameters of the process equipment, to provide the required orientation of the working element of the additive installation to reduce the error of shaping (approximation).
Research of micro and nano profile surface morphology of vibrational mechanical and chemical zinc coating
Authors: Ivanov Vladimir V. , Pogorelov Nikolay P. , Selemenev Mikhail F. , Sakunov Artem A.
Published: November 2018

There are some results of zinc coating research acquired on the metals’ surface as a result of mechanical and chemical synthesis, realized in conditions of vibro wave technological systems. The peculiarities of the surface morphology at the micro / nano level of the zinc coating are shown which are formed under the influence of low-frequency oscillations. The growth interconnection of the micro / nano profile of the applied zinc coating is shown. The determination of changes occurring on the coating layer surface at the micro / nano level. The absence of reliable data of the surface layer of the coating at the nano level has significantly limited its modification background. All of the mentioned above brings up to the following task, the given article is devoted to its solution: establishment of particlesdimension, the way of their distribution on the metal surface, besidestheir maximal and minimal roughness data cause by the alteration of the processing time.
Mechanical analysis of vibratory conveyor mechanism
Authors: Yeleukulov Yerlan , Atalykova Alfiya , Zhauyt Algazy , Abdimuratov Zhubanyshbay , Yussupova Saltanat , Alik Assel , Kenzhebayeva Gaukhar
Published: November 2018

The paper describes some of the basics of kinematics and dynamics of vibratory conveyor drive. Featured are dynamic modes of material that is being transported. Presented are the optimum material handling, and most rational mode. Introducing the empirical dependence transport speed as a function of angle bending conveyor, amplitude of oscillation of the transport container, the oscillation frequency excitation angle at which operates the actuating force and the coefficient mode of operation of the conveyor. Featured are some of the drive vibratory conveyors, and especially the operation of electromagnetic vibratory conveyor. In this paper is studied a vibratory conveyor that is placed on an elastic base. Using the closed contours method it was determined the system that needs to be solved to obtain graphical representation for the generalized coordinates determining the position of the mechanical system elements. The shaking conveyor represents the chase hanged or supported to the fixed section. The chase commits oscillating motions hereupon the cargo which is in the chase, migrates concerning to the chase. The nature of the flow and its parameters are determined by the nature of the oscillating committed by the chase. Justifying the dynamic parameters of the vibratory conveyor and a study of the strain-energy. Installation causes fluctuations fixed tray. Uniformly distributed load on the tray acts in each element of the mechanism. On the basis of the program MSC Adams investigated the strain-energy and kinetic-energy of each link mechanism with results and calculations.
Achievement of required surface roughnesses in complex profile channels by dynamic combined processing
Authors: Boldyrev Alexander I. , Sukhochev Gennady A. , Boldyrev Alexander A. , Silaev Denis V. , Sokolnikov Vasily N.
Published: November 2018

At present for processing of complex geometrical channels of workpieces electrochemical dimensional processing, vibro-impact machining and vibro-extruding are widely used. However combined electrochemical mechanical processing, that unites anodic dissolution and plastic flow of material in space and time, provides the required characteristics of surface layer. Local action anodic dissolution changes cold work amount and accelerates dissolution of micro- and macro-cusps, this causes annealing of physical and mechanical parameters in processed segments and accross the whole surface profile the required strengthening degree is attained.

The authors examine annealing model for microsurface by grain displacement in channel where extrusion forcing is dictated by grains size and profile of narrow blade channel and also by actual processing conditions. Operating conditions that are recommended for implementation of combined electrochemical mechanical processing of impeller and turbine type workpieces are found by experiments.

In consequence of field research they determined availability of standard microgeometry across the whole surface profile by combined processing with vibrations hashing with up to 2030 Hz frequency and low voltage current (in operation range from 1,2 till 1,8 V). Therein technological cycle decreases up to two fold, this reduces inadmissible jumping of blade edges and dimensional allowance.
Method and description of dynamic vibration reduction in cabins of gantry cranes
Authors: Kobzev Kirill O. , Shamshura Sergey A. , Chukarin Alexander N. , Bogdanovich Vitaliy P. , Kasyanov Valeriy E.
Published: November 2018

Reduction of vibration in the cabin can be achieved by increasing the area of vibration absorption by placing on the ceiling and floor vibro-absorbing facings. The process of absorption of vibration occurs due to the transition of the energy of oscillating particles to heat due to frictional losses in the pores of the material; therefore, for effective vibration absorption, the material must have a porous structure, the pores must be open from the side of the vibration and join together (unclosed pores) so as not to prevent the penetration of the vibration wave into the thickness of the material. As a vibration-absorbing cladding, we use a construction in the form of a layer of a homogeneous porous material of a certain thickness, reinforced directly on the surface of the fence.
Assessment of integrated index of environmental units of the transport system
Authors: Shulga Gennady I. , Kolesnichenko Alex O. , Skrynnikov Eugene V. , Shulga Tatiana G. , Vasilyev Maxim A.
Published: November 2018

Transport-technological complex environmental impact, drivers and participants in the transport process exhaust gases, products of wear of tires, road surface, brake pads and discs and other harmful substances.. Proposed air pollution on roads and highways to estimate the complex index of atmospheric pollution transport and technological complex (APITTC).
Combined strengthening treatment of welded joints of metal pipes of large diameter
Authors: Butenko Viktor I. , Isaev Albert N. , Bagdasaryan Tatiana M. , Cherepenjko Alexander A.
Published: November 2018

This article describes a method and device for the combined hardening treatment of welded joints of large diameter metal pipes, which allow to increase their strength and corrosion resistance due to the wave effect on the weld joint of the hardening tool and feeding the suspension into the working area without disturbing the overall process of welding pipes.
Influence of technological system’s rigidity on the dynamics of grinding process of flexible parts
Authors: Voronov Sergey A. , Kiselev Igor A. , Ma Weidong
Published: November 2018

The object of the present study is to investigate the dynamic of plane grinding by the tool with random distribution of abrasive grains, owning random geometric characteristics. The model is based on the consideration of machining system’s dynamical deformable characteristics, which have influence on the workpiece’s displacement under grinding process. The excitation of vibrations has significant effects on precision and surface quality, which is especially important in machining spatial parts, such as turbine blades.
Justification of the mathematical (thermodynamic) model of deformation processes in the materials cutting system
Authors: Neumoina Natalia , Ivashchenko Alexander , Belov Alexander
Published: November 2018

By the cutting system we mean the workpiece, shavings and the cutting tools that are in the conditions of contact interaction. In this system occur: the destruction of the material; elastic and plastic deformation; the formation of a new surface; electric and magnetic polarization of the surface layers; mechanical interaction of components of the cutting system, accompanied by internal and external friction; heat exchange between the components of the cutting system, which involves all the existing methods of heat transfer in nature (convection, heat conductivity, radiation); the withdrawal of energy from the system, accompanied by the formation of so-called dissipative structures. The authors propose a mathematical model developed using the thermodynamic theory, which takes into account the mutual transformation of energy in the system. To describe highly nonequilibrium processes, it is necessary to determine not only the state of the system at one time or another, but also be able to calculate the irreversible energy flows (the flux of the released elastic energy, the work flow of destruction, the mass flow, etc.), through which it is possible to trace changes, occurring in the cutting system.
Multiphysical mathematical models for design, identification and diagnostics of high-precision positioning systems
Authors: Lankin Anton M. , Lankina Mariya Y. , Lankin Mikhail V.
Published: November 2018

A multi-physical model was implemented in the software package LabView. Its choice is due to the need to solve the developed system of equations in an implicit form. LabView is a graphical simulation environment that allows you to build dynamic models, including discrete, continuous and hybrid, non-linear and discontinuous systems, using block diagrams in the form of directed graphs. These capabilities of the program confirm the need for its selection as a modeling environment.
Formalization of dynamic model of pneumatic drive with variable structure
Authors: Obukhova Elena N. , Grishchenko Vyacheslav I. , Dolgov Grigoriy A.
Published: November 2018

The work is devoted to solving the actual technical problem of increasing the speed and accuracy of pneumatic servo drives. Pneumatic drives have a large number of advantages (high speed of the output link, environmental friendliness, low cost, etc.). But having a high compressibility of compressed air limits the possibility of realizing optimal trajectories of motion of control objects. The complexity in the organization of controlling the follow-up pneumatic drive is also introduced by a mathematical apparatus that takes into account the thermodynamic processes during the filling and emptying of the working cavities of a pneumatic cylinder. In connection with this, the goal of this work was the development of a mathematical model of a servomotor with a variable structure that takes into account the various structures of pneumatic valves with proportional control. The proposed mathematical model will make it possible to use the synergetic approach in controlling the pneumatic drive. This makes it possible to take into account not less important drive parameters such as energy efficiency, etc., with increasing speed and accuracy of the drive.
Identification and diagnosis of high-precision positioning systems using the principal components method
Authors: Lankin Anton M. , Lankina Mariya Y. , Lankin Mikhail V.
Published: November 2018

The aim of this paper is to develop the theoretical basis of highprecision systems construction using principal components projection method for conducting natural model measurements of high-precision systems parameters. It is difficult to name a technical sphere, where highprecision systems systems aren’t applied. They can be found in many household appliances, communication devices, they are an integral part of electrical machinery, many devices of industrial automation, control equipment and protection of various electrical installations. To conduct natural model measurements we need models connecting various parameters of high-precision systems systems between each other.
Simulation, identification and dynamic control of the luminaire of the synthesized spectrum
Authors: Lukyanov Alexander , Donskoy Danila , Vernezi Miroslav
Published: November 2018

We consider the mathematical problem of the best (in the sense of OLS) approximation of the spectrum of sunlight modified by passing through thin porous environment, light from several sources with functionally or tabular given spectral density. The problem differs from the one known for the formation of light of the “white” spectrum by the optimization of the integral index of filling the spectral range and taking into account the real spectral function of the sources. Method for forming of the specified spectrum led managed agro-lighting.
Creating new technically stable building structures from composite materials
Authors: Kasharina Tatiana P.
Published: November 2018

This article discusses the creation of sustainable “viable” structure and facility construction from composite nanomaterials that have the properties of preserving original forms and recovering when internal and external loads are applied to them. The necessary requirements for the manufacture and operation of the composite nanomaterials are also presented. Modern design and construction in a cramped urban environment, the creation of territorial planning for a “vial” sustainable complex implies a paradigm of attitude towards nature, which introduces a system of new problems that were not always considered in the past: the quality of the environment; conservation of resources; social equity; control over emissions of pollutants; health of the population, etc. All of this requires a deliberate development of public consciousness and new ideas, which is emphasized by.
Influence of electromagnetic effect parameters on ferromagnetic powders fluidity
Authors: Egorov Ivan N. , Egorov Nikolay Ya.
Published: November 2018

The paper presents result of experimental studies of ferromagnetic powders fluidity management by effecting on particulate medium with constant and alternating gradient magnetic fields. Induction lines of constant magnetic field are perpendicular to symmetry axis of powder hopper. Alternating field is created by electromagnet with one tapering pole and has higher induction gradient values near hopper outlet. These fields form magneto fluidized bed from powder in hopper allowing powders of barium and strontium hexaferrite to flow through the hopper outlet. Dependencies of efflux speed from parameters of electromagnetic fields are presented for barium hexaferrite powder with average particle size 1 μm and strontium hexaferrite powders with average particle sizes 1 and 9 μm.
Boriding of steel surface with beams of boron atoms
Authors: Migal Yuri F. , Sidashov Andrey V.
Published: November 2018

We consider a new method for hardening the steel surface, which differs from the known CHT boriding method in the possibility of creating a surface with a lower fragility. Within this approach, the boriding is carried out by treating the steel surface with atomic beams of boron at a temperature below 750 °C. In this case, a friable layer of pure boron appears on the outer surface of the steel. Then, boron atoms diffuse from this layer into the surface layers of the steel. To detect boron in a steel sample, we used the X-ray photoelectron spectroscopy method. With its help we have obtained spectra of both the outer surface of a steel sample and surface layers at depths up to 8 nm. The spectra of the surface layers showed that as a result of boriding in the sample there appeared the boron in the zero oxidation state. This fact is consistent with the notion that, in the case of a small concentration of boron, it is located on the boundaries between the grains in the surface layer of steel and strengthens the bonds between the boundaries.
Features wetting and anisotropy of interfacial energy in a metal particle-silicon system
Authors: Aref’eva Ludmila P. , Blinov Andrey V. , Kravtsov Alexander A. , Shebzukhova Irina G. , Serov Alexander V.
Published: November 2018

In this paper, we propose a technique for estimating the wetting and anisotropy of the interfacial energy at the interface stabilized by organic compounds of metal particles (cobalt, copper) and semiconductor substrate based on the construction of the Winterbottom equilibrium shape of the crystal. The effective contact angle and the ratio of interphase energies at the particle-substrate interface are calculated from the experimental data of the geometric characteristics of the particles obtained by analyzing the AFM images of the samples. The accuracy of the evaluation of the effective contact angle for all systems is not less than 0.5 °. It was found that the phenomenon of incomplete wetting is observed in the systems under study. The work of adhesion in the systems under consideration is evaluated. With an increase in the effective contact angle, the ratio of the area of contact to V2/3 (V-volume of the particle) in different directions and the work of adhesion is nonlinear. The obtained dependences are qualitatively consistent with thermodynamic states and known data for other systems
Hole drilling and milling of magnetic alloys parts by shaped tube electrolytic machining
Authors: Glebov Vladimir V. , Danilenko Irina N. , Ratushinsky Ruslan I.
Published: November 2018

In this research shaped tube electrolytic machining of drilling and milling of magnetic alloys parts and difficult-to-cut metals, steels and alloys is presented. New research made in the field of space, aviation, automobile, medical, computer and electronics, and others has created the need for small and fine holes with high aspect ratio in these materials. The primary investigations of ECM with the tubular tool electrode are presented. Compared with mechanical machining, shaped tube electrolytic machining (STEM) exhibits an advantage in producing micro-holes with a high aspect ratio and in producing the curved holes. In order to realize the process of electrochemical machining, experimental assembly with the shaped tube tool electrode has been designed and manufactured. Completed researches indicate that this tool electrode has a high potential to machine difficult-to-cut and brittle metals economically and efficiently.
Tribology properties of hybrid graphene oxide materials as lubricant additives
Authors: Novikova Anastasia A. , Burlakova Victoria E. , Varavka Valery N. , Statsenko Tatyana G. , Kharitonov Grigory B. , Rubanov Vladilen V.
Published: November 2018

Graphene oxide was synthesized by the modified Hammers method. With managed hydrolysis in isopropanol solution obtained hybrid material “graphene oxide - copper oxide nanoparticles”. The phase composition of the hybrid material was studied by X-ray phase analysis and UV-visible spectroscopy. By ultrasonic processing dispersions of synthesized materials in glycerol were produced. The concentration of lubricating additives in the lube oil was 0.05 wt. %. The tribological properties of dispersions were investigated using a pin-on-disc friction machine. Tests showed that in the presence of graphene oxide, the friction coefficient was ~0.02, while with the addition of a hybrid material, the coefficient of friction was ~0.035. This is due to various mechanisms of lubrication. Reduction of the coefficient of friction in the presence of graphene oxide is associated with the formation of tribocarbon on the porosity of frictional contacts. While the addition of a hybrid material containing the CuO nanoparticles leads to the formation of a third body.
On the peculiarities of anti-plane surface waves propagation for media with microstructured coating
Authors: Eremeyev Victor A.
Published: November 2018

We discuss new type of surface waves which exist in elastic media with surface energy. Here we present the model of a coating made of polymeric brush. From the physical point of view the considered model of surface elasticity describes a highly anisotropic surface coating. Here the surface energy model could be treated as 2D reduced strain gradient continuum as surface strain energy depends on few second spatial derivatives of displacements. From the mechanical point of view the proposed model relates to 2D coating made of long fibers undergoing stretching and bending deformations. We consider here anti-plane surface waves. The dispersion relation is derived and its dependence on the material parameters is analysed.
Modeling of critical systems implementing negative events using dual Petri nets
Authors: Ganzhur Marina A. , Ganzhur Aleksei P. , Smirnova Olga V.
Published: November 2018

This work is devoted to solving the problem of modeling critical systems based on the use of modified Petri nets. The dual (binary) Petri net one of the modifications, which allows us to view inversing events at the same time, solving the problem with the possibility of deadlocks. Construction of schemes using fuzzy logic makes it possible to calculate the values of linguistic variables obtained knowledge. Petri dual network allows you to organize the exclusion of negative events by introducing additional links. In accordance with the rules, it is possible to construct a dual fuzzy Petri net, which involves the use of maximum and minimum transitions or appropriate logical calculations of conjunctions and disjunctions. Transition from classical Petri nets to dual fuzzy nets, realizes fuzzy knowledge of logical deriving that gives the chance in construction of expert systems with fuzzy logic solving a problem of data analysis.
The design of electric drives with electronic protection devices
Authors: Khastsaev Boris D. , Dedegkaeva Larisa M. , Maslakov Maksim P.
Published: November 2018

The possibility of designing an electronic device for protection and diagnostics of electric drives with improved characteristics is considered. The technique and algorithm of design of similar devices, the structural scheme of the device constructed on their basis are offered. To improve the characteristics of the device of protection and diagnostics of electric drives in the work it is proposed to provide for the use of measuring transducers with linear dependencies of the output values on the controlled ones. The latter is possible as a result of the use of measuring circuits in measuring transducers with linearized dependencies of the output values on the input and the use of intelligent sensors. As a measuring circuit for the construction of measuring transducers is considered the measuring circuit of Kenigsberg, which is characterized by a linear dependence of the output active value of the passive measured (controlled physical quantities). At the same time, the intelligent sensors are additionally assigned the function of linearization of the output dependence of a «simple» sensor on the controlled physical quantity.
Application of impedance method for research the dynamics of asynchronous motors
Authors: Khastsaev Boris D. , Merkushev Dmitry V.
Published: November 2018

One of the possible fields of application of the impedance method based on the use of impedance and its components as an informative parameter is considered. This area of work is the study and diagnosis of asynchronous motors in dynamic mode. The paper presents both a T – shaped scheme of replacement of an asynchronous motor and one of its possible mathematical models, on the basis of which conclusions were made about the feasibility of applying the impedance method for the study and diagnosis of asynchronous motors and the need to develop hardware for this method. In this regard, the main part of the work is devoted to the consideration of measuring transducers necessary for both the technical implementation of the method as a whole, and the instrument support of the method. The option to build transmitters that use the basis four-armmeasuring bridge circuit known as a Wheatstone bridge. The first сonverter is easier to implement because it is implemented on the basis of the Whitstonbridge with one feedback, but is characterized by less functionality. The second converter is implemented more difficult, as it is also implemented on the basis of the Whitstonbridge, but with two feedbacks. However, this version of the converter has more functionality.
System analysis of power consumption by nonferrous metallurgy enterprises on the basis of rank modeling of individual technocenosis castes
Authors: Klyuev Roman V. , Bosikov Igor I. , Gavrina Oksana A. , Revazov Vladimir Ch.
Published: November 2018

To increase energy efficiency at non-ferrous metallurgy enterprises, an integrated system approach for estimation of electricity consumption is needed. The paper presents the results of a rank analysis of the power consumption of individual castes of process equipment on the basis of an integrated energy survey of the enterprise. A methodology for constructing mathematical models for calculating and predicting electric power consumption for all castes of the ranked H-distribution of technocenosis has been developed. For the first time, according to the established regularity of the H-distribution, a mathematical model for predicting power consumption has been developed, including a quantitative analysis of the energy characteristics of consumers by individual castes of technocenosis. A retrospective check of the relative error in the prediction of electricity consumption showed that for the model it does not exceed 2%, which is significantly lower than the relative error of the prediction for a number of models of other types. The received model is recommended for use in the automated system of dispatching control of power consumption for the purposes of short-term forecasting of electric power consumption at industrial enterprises of non-ferrous metallurgy.
Review of methods for solving inverse problems in identifying permanent magnets of executive elements in dynamic devices
Authors: Balaban Anna L. , Bakhvalov Yuri A. , Denisov Peter A.
Published: November 2018

Permanent magnets due to their overall-saving and energysaving properties are increasingly used in the executive elements in dynamic systems of various fields of technology (electric motors, electromagnetic drives, electromechanical devices – relays, contactors, etc.). At the same time, devices with permanent magnets have a disadvantage – under the effect of overheating, mechanical shocks and current surges in the windings, their demagnetization occurs, which can lead to disruption of operation and failure of devices. In this regard, there is a need for identification of permanent magnets, that is, assessment of their condition by investigating the distribution of the magnetization by the volume of the permanent magnets by using the solution of inverse problems. The article provides the overview of methods for solving such problems. The analysis of publications has shown that two approaches to the solution of inverse problems can be distinguished: – the linearization of some functional and the multiple solution of the direct problem of calculating the magnetic field; – solution of the ill-posed problem and determination of the pseudo-solution stable to small perturbations by regularization methods. Both approaches have disadvantages. For example, the application of mesh-based methods in field calculations leads to the need to solve systems of equations of large dimension, parallel calculations are not used, etc. Therefore, the improvement of methods for solving inverse problems in the identification permanent magnets of executive elements in dynamic devices is an actual problem.