bluuebunny/crossref_metadata_2025 huggingface dataset:
Modeling, simulation and test of the heat flow in a liquid nitrogen cryostat for Mössbauer spectroscopy
Authors: Gutiérrez N A , Velásquez A A
Published: June 2019

In this work, we present a heat flow analysis for a conceptual design of an open cycle liquid nitrogen cryostat with application in Mössbauer spectroscopy. Initially, we made a study of the different configurations of Dewar type cryostats reported in the literature. These configurations are based on existing designs and the Mössbauer spectrometer requirements of the Instrumentation and Spectroscopy Laboratory at Universidad EAFIT in Medellín. From this study, we establish our own conceptual design. A first heat flow analysis in stationary state was calculated to obtain the dimensions of the reservoir vessel. The heat flow model obtained predicted an adequate evaporation time of the liquid nitrogen for the acquisition of Mössbauer spectra. For this model we employed the Fourier’s law, the heat flow by radiation in grey bodies and the properties of 304 stainless steel, 6061 aluminium alloy and OFHC copper. In consequence, the mechanical design of the cryostat was defined and the new heat loads associated with it were added to the initial model. Finally, the prototype was built, the model was tested and some final corrections were made.
Characterization of the corrosion products of one of the pedestrian paths of the bridge “Punto Cero” in the city of Medellin, Colombia
Authors: Velásquez A. A. , Jaramillo Raquejo D.
Published: June 2019

In this work, we present the structural and magnetic characterization of the rust products formed on one of the pedestrian paths of the bridge “Punto Cero” of the city of Medellín, Colombia. The rust products were obtained by scraping three zones of the surface of the pedestrian path, namely: a surface that faces the sky, a surface that faces the floor of the path and a surface with a crack, where a high corrosion state was observed. The rusts were characterized by X-ray Diffraction, Fourier Transform Infrared Spectroscopy, room temperature Mössbauer Spectroscopy and Vibrating Sample Magnetometry. The analyses made by these techniques show that the rust products formed on the surfaces facing the sky and floor are composed mainly by goethite, lepidocrocite and maghemite, in percentages of 74%, 24% and 2% respectively, while the rust taken from the more corroded substrate presented 55% of goethite, 28% of lepidocrocite and 17% maghemite. Mössbauer and X-ray measurements were highly consistent with the percentages of each phase found in all rusts. The results suggest that in addition to the type of steel and the atmospheric conditions which the structure is exposed, the specific location of some surfaces plays an important role in the type and percentage of phase formed on them, being higher the presence of spinel phase in the zones more prone to moisture accumulation. On the other hand, the formation of maghemite could be an indication of an important state of corrosion of some surfaces, which could serve as a guide to start preventive maintenance actions on the structure.
Nanocomposite rGO@TiO2 Supported on Fique Fibers for Photocatalytic Degradation of Dyes
Authors: Lorena Barajas-Rueda Yeimi , Lizeth Pinzón-Martínez Martha , Gutierrez Nelson , Díaz German , Marina Ballesteros-Rueda Luz , Cabanzo Rafael , Mejía-Ospino Enrique
Published: June 2019

By means of ultrasonic and cationic treatment, the surface of the fiber was adapted to maximize the support of the nanocomposite rGO@TiO2; which had a previous preparation and subsequent anchoring to the fibers by chemical reduction in times of immersion. The fibers were subjected to characterization by FTIR spectroscopy, while in the nanomaterial obtained was verified the deposition of the nanocomposite by means of scanning electron microscopy SEM, as well as the change in the value of the bandgap for TiO2 by UV-spectroscopy. In order to evaluate the photo-degradative activity of the rGO@TiO2 / Fique catalyst, we used Methylene Blue (MB). The experiments were carried out using sunlight that allowed obtain a degradation efficiency of approximately 99 % in two hours.
Comparison of Bi
2
S
3 and Ta
2
O
5 as alternative materials to gold in nanoparticles used as agents to increase the dose in radiotherapy
Authors: Alejo-Martinez Harley , Sevilla-Moreno Andrés C. , Ondo-Mendéz Alejandro , Quintero Jorge H. , Páez Carlos J.
Published: June 2019

Radiotherapy is an essential component in the treatment of all types of cancer. Radiotherapy uses ionizing radiation to destroy tumor tissue while reducing the damage to normal tissue as much as possible. In this work we study the effects of the spherical Bi
2
S
3 and Ta
2
O
5 nanoparticles (NPs) used as a radio-sensitization agent to increase local doses around the nanoparticle in a water medium. For low energy X-rays the dominant interaction is the photoelectric effect, which involves the absorption of a photon and the subsequent production of photoelectrons, characteristic X-rays and Auger electrons. Using a GEANT4 based simulation was determined the kinetic energy spectra of secondary electrons produced by the interaction of X-ray beam and Au, Bi
2
S
3 and Ta
2
O
5 NPs, after that was calculated the interaction processes, energy deposited, absorbed dose and the effective range distributions for the secondary electrons generated by the interaction of 100 million incident photons in the nanoparticles. The size of the nanoparticles was 20 nm and the energy distribution of the photons corresponds to the spectrum of a tube of x-rays with Tungsten anode and a peak voltage applied of 40 kV. This study demonstrates that Bi
2
S
3 and Ta
2
O
5 NPs are a viable alternative to Au NPs as a dose enhancing agent in radiotherapy.
The mind-mapping learning model in the robotics course
Authors: Ismara KI , Asmara A , H Sigit P , Asnawi R
Published: June 2019

This paper aims to describe the mind-mapping learning model employed in the Robotics course and the results of its learning process. Used the classroom action research, the study was conducted in four meetings in the Electrical Engineering Education Department of the Faculty of Engineering Yogyakarta State University (YSU). The research participants were 21 students of the Robotics course. The data were collected by questionnaires and tests, the pre-and post-test, and analyzed descriptively. The results stated that the mind-mapping learning model, which was delivered in form of videos, could increase students’ understanding of the Robotics course with an average score of 3.6 out of the 4.0-Likert scale. The average post-test score indicating the students’ mastery learning of Robotics was 92.
Driving control module for low cost industrial automated guided vehicle
Authors: Maarif ES , Moyo T
Published: June 2019

Automatic Guided Vehicles (AGVs) are computer-controlled “driverless” mobile vehicles equipped with optical, magnetic or laser guidance systems for automated functionality, categorized as either load carrying or load towing. AGV consists of several parts, such as the frame for pulling or lifting weights, movement balancer wheels, battery housing, collision avoidance sensors, driving module and others. But, the most important part of AGV is the driving module which is a module that functions as a movement guide, consisting of path detection sensors, driving motors and controllers. This Paper presents low cost a driving control module for low cost AGV that used in automotive manufacture industry. The AGV uses Raspberry Pi instead of PLC as controller, infrared sensor to detect line and industrial standard brushless DC (BLDC) motor as main actuator. PID control applied in the movement of the BLDC motor speed so that the AGV can follow the path smoothly and precisely. As a result, the AGV can follow the path with speed 30 m/min on a straight road and 30 m/m at a turn with a deviation 5 mm off the track.
The implementation of resource-based learning to improve creativity in developing Yogyakarta batik motif
Authors: Asiatun K , Widarwati S , Sugiyem  , Bestari AG
Published: June 2019

This study aims to 1) investigate the implementation of Resource-Based Learning (RBL) in Batiking Course, and 2) identify RBL’s impacts on students’ creativity in developing the motifs of Yogyakartan batik. The method employed in this study was Classroom Action Research proposed by Kemmis and McTaggart, involving a cycle of planning, observing, and reflecting. This research was carried out in Fashion Design and Hospitality Education Department, Faculty of Engineering, Yogyakarta State University in the 2017/2018 academic year, from January to June 2018, with 36 students from Fashion Design Study Program participating as the research subjects. The instruments were tested for content validity and the items proved properly designed, while the reliability was assessed using Cronbach’s alpha, resulting in an alpha value of 0.525, showing that the instrument items could be used. The obtained data were analyzed using descriptive statistics. The results of this study show that 1) the implementation of RBL in Batiking Course has been carried out in 2 cycles, consisting of Introduction, Main Activities, and Closing, and 2) in the Pre-Cycle, Cycle I, and Cycle II phases, the mean scores of the students’ creativity are 29 (less creative), 37 (creative), and 47 (very creative) respectively. Therefore, the number of creative students in this implementation has increased from only 28% to 94%.
Tracking the potential of vocational high school students leading to eighteen strategic creative industry sub-sectors in Indonesia
Authors: Setiadi BR , Suparmin  , Priyanto S , Roniwijaya P
Published: June 2019

This study aims to trace the interest of Vocational High School (VHS) students to meet the sub-sectors of strategic creative industry in Indonesia which is divided into eighteen sub-sectors such as animation, architecture, design, photography, music, crafts, culinary, fashion, research and development, publishing, film, advertising, interactive games, performing arts, visual arts, information technology, television, radio and video. The study will also track the reasons why students choose these sub-sectors with three priority-scale options.The research method used is an exploratory survey with the dominant approach is quantitative. This study was conducted in 7 VHS in DIY-Indonesia with a sample size of 350 people. The subjects of this study are students with a background of educational concentration is technology and engineering. The technique of collecting data using questionnaire of specialization. Data analysis techniques used descriptive statistics that aims to determine quantitatively the percentage of student’s interest in sub-sub creative industries.Quite unique findings are generated in this study because researchers want to explore the other side of the engineering students who in fact work by relying on hard skill instead of developing their soft skill. The results of this study indicate that the dominance of student interest to eighteen creative industry sub-sectors exists in the sectors of music, photography, and design. While the sub-sector that they are not interested in the fashion sector. Other tracking results are the reason students choose the three priority sectors of interest are because their hobbies are relevant to the sub-sectors of the creative industry of their choice. This study will have implications for schools to attend the potential of other gifted students in the creative industries. If this can be effectively explored, employment opportunities for engineering students will become wider and foster an entrepreneurial spirit so they can open new jobs for others in need.
The effects of a teaching factory learning model on students’ competency: an empirical study at the department of automotive engineering education of Universitas Negeri Yogyakarta
Authors: Sulistyo B , Siswanto I , Tawardjono  , Widodo N
Published: June 2019

Vocational education is expected to serve the function of preparing competent and skilled graduates to meet the needs of industries. Therefore, this study aimed to determine the effects of implementing a teaching factory learning model integrated into the subject of Vehicle Body Painting on the students’ competency. Using the research design of an experimental approach, this study involved two research groups that consisted of Automotive Engineering students following the subject of Vehicle Body Painting. The control and the experimental groups were treated respectively with a training based learning model and a teaching factory learning model. Indicators to be observed were the results of the competency test and the feasibility of the students’ work. The data were collected through a competency test and documentation. The findings of this study suggested that the teaching factory learning model had significant effects on the students’ competency (83.82) compared to the students treated with the training-based learning model (77.87).
Developing project based learning module of CNC milling mechanical technique on mechanical engineering department vocational high schools in Surakarta
Authors: Nugroho T U , Sukardi T
Published: June 2019

This development research that use ADDIE model with stages: (1) Analysis, (2) Design, (3) Development, (4) Implementation, and (5) Evaluation. The object of research was students of XII class on Vocational High Schools in Surakarta. Internal trials included validation material expert and media expert, while external trials included teachers and students responses to use module. The trials data was collected through questionnaire, observation, documentation, and interview which were analyzed qualitatively and quantitatively. The research result: (1) The CNC learning module developed is suitable for CNC learning, students can learn independently and thoroughly, includes description and CNC learning goals, adaptived to development of science and technology, students easy to read and understand; (2) CNC learning module developed were declared very feasible by material expert feasibility percentage of 83.2% and media expert feasibility percentage of 84.04%, the teachers response to the module is 95.6% and the students response is 85.8% which module is very suitable to be used; (3) increasing of students learning outcome after using the module is 17.09% and student learning completeness reaches 100%. The conclusion of research results is module very feasible and effective to be used for CNC learning at Vocational High Schools in Surakarta.
Development of a mathematical model for the numerical study of a thermal control system fluid circuit
Authors: Tanasienko F V , Shevshenko Yu N , Melkozerov M G , Kishkin A A , Delkov A V , Khodenkova E V
Published: June 2019

This paper considers the development of a mathematical model for spacecraft thermal control fluid circuit systems. The need to take into account the complex mode of heat exchange in a fluid circuit model reflects relevance of the paper. Basic equations of heat exchange model in the circuit are given. A procedure for the numerical solution is described. Obtained calculation results are presented and analyzed. The developed model allows numerical studies to assess an impact on characteristics of the circuit of various design and operating parameters.
Development of automatic control system of satellite signal parameters with TDMA technology
Authors: Murigin A V , Mikishev G S , Kudabayev B T , Anarov M Zh , Kutsev M A
Published: June 2019

The control of the frequency spectrum state under operating conditions of the satellite networks that include plenty of satellite earth stations is one of the main functions of ground segment of space communication systems. In this case, the control system of the satellite network must measure the parameters of separate network segments or separate earth station if it is necessary. The necessity for selective measurements is relevant in the following cases: the power level, noise level or spurious radiation level of any earth station is significantly higher than the nominal one. The overview of some existing monitoring systems that makes automatic control of the frequency spectrum is presented. The analysis of the problem arisen during the functioning of satellite TDMA networks that involve plenty of earth stations is presented. Based on the analysis, it was concluded that the existing control systems of the satellite networks do not allow measuring high frequency parameters of separate earth stations under TDMA technology. The analysis of the problem of measuring the channels parameters of satellite network functioned by using the TDMA technology is presented. The differences between computations of channel power under “single channel per carrier” technology and the TDMA technology are presented. The authors proposed an automatic control system of high-frequency (HF) parameters of satellite signals, functioning by using the time-division multiple access technology. The block diagram of this system and description of its operation are presented. The conditions for implementing this automatic control system are defined. The time chart and its characteristics were calculated during measurements executing by this automatic control system. The method of match making between the received signals through the satellite segment and the identifiers of earth stations of the satellite network is presented.
Improving the efficiency of information processing based on the entropy-parametric approach
Authors: Polosin V G , Bezborodova O E , Bodin O N , Trofimov A A , Ubiennykh A G
Published: June 2019

The paper contains an analysis of the task of establishing quantitative information reflecting the properties of the observed object. The authors of the article showed that in order to operate, both controls instruments and measuring instruments, it is necessary to form a “Euclidean measure” for the property of the object at the current time. The article describes an independent method for estimating the uncertainty of the state of an object by calculating the entropy of its observed properties. In particular, it is shown that the entropy potential is proportional to the measure of Euclidean space. A description is given of the method for determining the shape of an approximating function for sampling results based on a comparison of the difference between Euclidean measures and measures of the information space formed for entropy potential.
The study of cracks of X70 steel sample selected from the focal zone of destruction
Authors: Nasibullina O A , Tyusenkov A S
Published: June 2019

The fuel and energy complex is the basis for the development of all sectors of the Russian economy. Its most important element is trunk pipeline system for the transport of gas, oil and their products. The main gas pipelines with cathodic protection, are exposed to the impact of ground electrolytes and tensile stresses. As a result, corrosion cracks may appear on the pipe surface. One of the most dangerous types of destruction of gas pipelines is stress-crack corrosion (SCC) of the outside cathode-protected metal surface of the pipes. There are no efficient methods for SCC control at present (the only method for SCC control is application of anti-corrosive insulation). One of the methods for detection of stress-crack corrosion is the stress test, however, its application is justified only for single cracks. There is a system of cracks in practice. Analysis of the focal zone of the collapsed gas pipeline with multiple cracks was carried out in this research. Studies were conducted on a sample of X70 steel made in Japan, selected from the focal zone of destruction of the West Siberia gas pipeline. The sample has 4 cracks typical for SCC crack. A metallographic analysis of the X70 steel and the calculation of the stress-strain condition of the metal were carried out. On the basis of the obtained results, it is proved that tested cracks have a corrosion-mechanical origin typical for stress-crack corrosion.
Mathematical model for the study and prediction of a porous body thermal state
Authors: Ravshanov N , Shadmanov I U , Kravets O Ja
Published: June 2019

The paper deals with a mathematical model of thermal state of a porous body which is in form of a rectangular parallelepiped. The internal heat generation and the heat exchange between the surfaces of the porous body and surrounding medium were taken into account in the model developing process. In order to solve the problem, there was developed a modification of the finite-difference method based on the method of lines. Also, using the least squares method, there was proposed a sinusoidal formula for describing the annual variation of ambient temperature.
Pulse altimeter for aircraft
Authors: Samoylov A G , Samoylov V S , Samoylov S A
Published: June 2019

The paper discusses the methods for measuring the flight altitude of aircraft and the design features of pulsed radio altimeters. The results of model experiments in measuring the height by a pulsed radio altimeter are given.
Methods and means of measuring information exchange among the spacecraft on the laser connection line
Authors: Kartsan I N , Malanina Yu N , Zhukov A O , Tsarev R Yu , Efremova S V
Published: June 2019

The article deals with the methods and means of using the inter-satellite measurements on the laser communication lines for high-precision temporary support of the GLONASS system spacecrafts. There is given the justification of the principles of measuring and exchange information among the spacecrafts via the laser navigation and communication lines for mutual synchronization of the on-board time scales of the GLONASS system spacecrafts.
Composite electrochemical nickel coatings with dispersed particles
Authors: Khaibieva V Sh , Fomina R E , Saifullin R S , Mingazova G G
Published: June 2019

The composition of electrochemical coatings of nickel-zirconium dioxide, the peculiarities of their morphology were investigated. It was shown that depending on the dispersion and the method of preparation (plasma-chemical method and deposition method) of the dispersed phase, the content of inclusions in coatings varies from 0.2 to 1%, in the case of the plasma-chemical method and from 0.3 to 2%, in the case of particles obtained by the deposition method. Nickel-zirconium coatings are characterized by increased microhardness, corrosion resistance, and wear resistance compared to control precipitates by 1.4; 2.4 and 1.2 times respectively.
Prediction model for the pressing process in an innovative forming joints technology for woodworking
Authors: Rubleva O A , Gorokhovsky A G
Published: June 2019

To improve the efficiency of the joints formation, a new method of pressing in the longitudinal direction is proposed. This paper presents a predictive model for the pressing force depending on the state of the wood and the parameters of the pressed mortise. The most significant factors are the width of the mortise and the moisture content of the wood. Interestingly, the depth of the mortise formation is a less significant factor, which means that the pressing technology will allow to form a long glue line and accordingly high joint strength due to sufficient profile length. In the test range of factors, the best results in terms of energy costs are shown by a minimum mortise width of 4 mm. Further research should be devoted to the study of the formation of small width mortises (4 mm or less) and the investigation of their quality.
Materials with mechanoluminescent properties and their use for registration of impact
Authors: Tatmyshevskiy K V
Published: June 2019

In the present article, the questions of using the materials with mechanoluminescent properties as impact indicators are analyzed. The class of substances that exhibit mechanoluminescence (ML) the most intensively is revealed. Various designs of ML transducers are considered. The mechanism of ML radiation, which is based on the interaction between the mobile charged dislocations with the luminescence centers, formed by the activator atoms, are considered. Space charge of the moving dislocations causes tunneling of electrons to excited state with the subsequent radiating transitions. The problem of calculation of elasto-plastic strain of the transducer was solved by means of the microdynamic theory of plasticity. Equation of the intra center ML kinetics is given, with separate calculation results. The major features of the output optical signals of ML transducers on impact is analyzed.
Hierarchical scheduling problem in the field of manufacturing operational planning
Authors: Semenkina O E , Popov E A , Ryzhikov I S
Published: June 2019

The paper considers a job shop scheduling problem similar to those taking place in many fields such as project management, educational sphere and operational planning of manufacturing process. The considered problem, in real life, has high dimensionality and it is quite hard to find even a feasible solution, therefore, making necessary a problem-oriented heuristic for solving it in reasonable time. Manufacturing process stability requires special care about restriction and, at the same time, operational planning requires finding solutions quickly. In this paper, hierarchical problem structure is proposed where the top-level problem is the traveling salesman problem and the nested resource-constrained project scheduling problem is replaced by the simulation model. This paper considers combinatorial genetic algorithm (GA) and Lin-Kernigan heuristic (LKH). The performance comparison is fulfilled and competitive results are demonstrated.
Problems and features of data structure modeling in distributed Web-oriented production systems
Authors: Danilov A D , Kravets O Ja , Terekhov D V
Published: June 2019

The goal is to develop a system model necessary for structuring the subject area, decomposing the functions performed by a web application; formalize the design methods, determine the general method of synthesizing Internet-oriented information systems. The main part of the development is the creation of a model, which components will be the objects of the domain, while attention should be paid to balance - the flexibility of the model and the development costs, taking into account the possibility of reuse. Too flexible components will have too many properties and will be difficult to customize adjust. On the contrary, models that implement too particular situation will be useless in terms of reuse, and, perhaps, the cost of its implementation will not make sense. For a more complete understanding of the functions and requirements for data processing, it is necessary to identify the main objects of the domain, information flows, logical connections, as well as rules and restrictions when working with data. The result of building a model should be a DBMS-independent data schema (metadata) corresponding to the internal data structure of the Web application, focused on the implementation of the required functions when interfacing with the user.
Digital transformation of bicycle rental maintenance process
Authors: Galyom V Yu , Shchenikov Ya A
Published: June 2019

The payback of urban cycling has received considerable attention in many countries. One of the reasons for the loss of bicycle rental companies is the cost of maintaining rental bicycle transport caused by vandalism and poor bicycle handling. The article describes a fuzzy inference system, which, based on information obtained from an accelerometer installed on a bicycle, allows making a forecast about its technical condition. Each bike is assigned a rating, in accordance with bicycle rental maintenance process should be carried out. This rating is also used when cyclist choose a bicycle at the rental station. At the same time, a bicycle with an unsatisfactory technical condition is not issued to a cyclist. A conceptual model of digital transformation of a company providing bicycle rental services is presented.
Simulation of thin-sheet metal blanking and punching by elastic mediums
Authors: Semenov I E , Povorov S V
Published: June 2019

The paper describes the processes of thin-sheet workpiece blanking/punching using an elastic tool in an open and closed container. Finite element models are constructed, which describe the process of separation of the workpiece by an elastic workplace tool. A comparative analysis of the geometrical dimensions of the workpieces obtained as a result of theoretical and experimental studies was carried out.
Development of an automated fire extinguishing system for the mine of the third Solikamsk potash-mine control
Authors: Kostarev S N , Gladkov A N , Goryachev S N
Published: June 2019

The statistics of accidents at the enterprise “Uralkali” is analyzed. The object of the study was the fourth mine of the third Solikamsk potash mine. SKRU-3 is one of three mines in Solikamsk, where the underground method at a depth of 100 to 500 meters is the extraction of potassium and magnesium salts. A fatal accident was identified, as a result of smoke and fire at the fourth mine at a depth of 363 m, 9 people died – the builders of the contracting organization. The contract for the construction of the trunk was executed by the employees of FSUE Construction Management No. 30 from Bashkortostan. When developing a fire extinguishing system, a functional scheme for controlling a drainage pump and a high-pressure fire pump was constructed. Logical equations and relay-contact circuit equipment are developed. The design part proposes the use of software and hardware based on the Omron microcontroller.
Study of defects of the surface of rolls of rolling bearings under grinding
Authors: Nosov Nicolay , Bobrovskij Sergej , Levitskih Olesja , Khaimovich Alexander , Kanatnikov Nikita , Metel Alexander , Zaides Semen
Published: June 2019

The article proposes a new approach to the method of assessing the surface defects of the raceway of instrument bearings after profile grinding. The surface defects of the bearing raceways were studied on an optical-electronic complex on the basis of calculating the parameters of the autocorrelation function obtained as a result of computer processing of the video image of the surface. The purpose of this study is improving the profile grinding technology of bearings through the construction of an optical-electronic information-measuring system for monitoring the defects of raceways.
Improving the process of designing route maps in production
Authors: Karpaev S A
Published: June 2019

The paper describes the method of designing route maps, taking into account the capabilities of the production means, which will improve the efficiency of the technological processes being developed through the planning of resources. The paper presents the data used in the design of the route, as well as the model of interaction with the archive of technological processes. The basic requirements for the implementation of the proposed model at a high-tech instrument-making enterprise are described. The feasibility of using this approach in the framework of the integration of the computer-aided design system information flows for technological preparation of production and manufacturing automation systems is shown. An example of the route formation using the tools developed in the research process.
Simulation of a copper micro-wire drawing for electronics
Authors: Volkov A V , Sokolova I D , Korzhavyi A P , Beckel L S
Published: June 2019

The paper discusses the application of the mathematical model of repeated drawing with the sliding of a micro-wire made of copper, intended for the installation of intracircuit electrical connections of microcircuits. Creating production methods and methods for producing microwires based on copper is a complex scientific and technical challenge: only individual firms can produce material that fully meets the needs of the microelectronic industry [1-3]. Therefore, it is necessary to work on the creation of a micro alloyed alloy with rational deformation parameters and providing protection against corrosion damage during micro welding, sealing and operation of devices. The algorithm of the mathematical model applied in the design of drawing transitions is presented. Based on the analysis of the model, recommendations were made for its further improvement in order to increase the reliability of the drawing process with the involvement of process stability criteria. In modelling the technological process of drawing copper, an algorithm developed by the authors for drawing aluminium microwire was used, taking into account the changes needed to make a different material [4–8].
The use of greases with ultrafine diamond-graphite powder to reduce a fatigue wear of rolling bearings
Authors: Dokshanin S G , Tynchenko V S , Bukhtoyarov V V
Published: June 2019

The present paper shows the results of studies on the use of the plastic lubricants with ultrafine diamond-graphite powder in rolling bearings. Even with a short-term tightening of the operating mode, it is possible to establish a friction boundary mode by squeezing the lubricant out of the rolling parts contact zone with the ring tracks, which leads to an increase in the friction torque and temperature. Reducing slippage, lowering the working temperature, limiting the friction torque can be achieved by improving the antiwear and anti-friction properties of the lubricants used. Tribological studies have established that the introduction of the ultrafine diamond-graphite powder into the composition of basic industrial lubricants significantly improves their performance. The introduction of ultrafine diamond-graphite powder into a lubricant reduces the amount of rolling bearings wear up to 1.6–1.8 times, reduces the amount of friction torque to 23–25%. The presence of a lubricant that can significantly reduce friction forces, reduces the amount of internal stresses and delays the fatigue cracks progress, which allows to increase the service life of rolling bearings by 1.5–2 times.
Intellectualization of the technological processes of permanent joints formation at the rocket-space enterprises
Authors: Tynchenko V S
Published: June 2019

The paper deals with the problem of improving the quality of the technological processes of permanent joints formation at rocket-space enterprises. In the course of the study, an analysis of modern technologies for the permanent joints formation of spacecraft elements at the enterprises of rocket-space industry in Russia was conducted, as a result of which the main problems were identified. The analysis made it possible to set the tasks of intellectualization of such production processes as induction soldering, electron-beam welding and diffusion welding. As an algorithmic solution to the assigned tasks, the use of modern intellectual methods is proposed, which allows solving the problem of control in the context of incomplete information on the parameters of the technological process, as well as its complete absence.
Spacecraft onboard equipment testing automation technology on the basis of simulation model
Authors: Isaeva Olga , Nozhenkova Ludmila
Published: June 2019

This article presents the technology of preparation and execution of functional control of spacecraft onboard equipment on the basis of an intelligent simulation model. The technology includes implementation of the methods of test procedures’ generation and analysis of the results in accordance with the simulation model’s precedents. This technology allows you to analyze characteristics of the test objects on models with further analysis of the real equipment operation.
Method and device for testing the parameters of the wire from NiTi alloy in the high-temperature manufacturing process with use an inert gas
Authors: Galagan R , Muraviov A , Tomashuk A
Published: June 2019

NiTi alloy is a shape memory alloy that can be applied in various fields of science and technology. The use of NiTi alloy wires in the design of the engine reduces energy consumption to drive the engine mechanisms and improve economic efficiency in general. In this paper, we propose a method and improved design of an optical device to check the diameter and temperature of the surface of the NiTi wire at high temperature during its manufacture in an inert atmosphere. Brief information about high-temperature manufacturing processes of extended cylindrical products is given. The monitoring algorithm for both parameters of the wire was proposed and the main errors was deduced. The required temperature range for the NiTi alloy at a wire die-less drawing is determined.
Development of a non-explosive water source of seismic acoustic waves with an electromagnetic drive to automate the work in transit zones and in shallow water
Authors: Kudinov D S , Maikov O A , Romanov V V , Kokhonkova E A
Published: June 2019

The paper examines the theoretical aspects of the excitation of seismic waves in the aquatic environment, addresses the problems of instrumental implementation of a fundamentally new source of seismic vibrations that can work in the waters, in tidal and coastal zones, i.e. produce continuous seismic profiling from the water area to the land. The scientific substantiation of the developed SI design is given. The effectiveness of two polar excitation of the aquatic environment is evaluated in comparison with the water electromagnetic pulse sources of the Yenisei series. The comparative analysis results of SR experimental model effectiveness with VEM-50 production model of the “Yenisei” model range is given on the basis of experimental data obtained at the geophysical well of the testing and testing ground of the Siberian Federal University.
Automatic calculation of left ventricular volume in magnetic resonance imaging using an image-based clustering approach
Authors: Ivanov Ilia , Lomaev Yuri , Barkovskaya Alexandra
Published: June 2019

In this work we propose an algorithm to automate the process of left ventricular (LV) volume calculation during magnetic resonance imaging (MRI) analysis. The proposed algorithm does the LV segmentation, volume calculation, finds the time frames where the heart is in systole and diastole phase, and calculates LV ejection fraction. The proposed approach has been tested on a dataset containing MRI study results of 500 patients. According to experimental results the root mean square error of LV systolic volume calculation is 21.64 ml, LV diastolic volume - 44.92 ml, ejection fraction - 7.96 %.
New method of training two-layer sigmoid neural networks using regularization
Authors: Krutikov V N , Kazakovtsev L A , Shkaberina G Sh , Kazakovtsev V L
Published: June 2019

We propose a complex learning algorithm for sigmoid Artificial Neural Networks (ANN). We introduce the concept of the working area of a neuron for sigmoid ANNs in the form of a band in the attribute space, its width and location associated with the center line of the band to a fixed point. We define of the centers and widths of the working areas of neurons by analogy to the radial ANNs. On this basis, an algorithm for selecting the initial approximation of network parameters, ensuring uniform coverage of the data area with neuron working areas was developed. Network learning is carried out using a non-smooth regularizer designed to smooth and remove non-informative neurons. The results of the computational experiment illustrate the efficiency of the proposed integrated approach.
A modified particle swarm optimization algorithm for location problem
Authors: Osinuga I A , Bolarinwa A A , Kazakovtsev L A
Published: June 2019

In the Weber location problem which was proposed for optimal location of industrial enterprises, the aim is to find the location of a point such that the sum of weighted distance between this point and a finite number of existing points is minimized. This popular model is widely used for optimal location of equipment and in many sophisticated models of cluster analysis such as detecting homogeneous production batches made from a single production batch of raw materials. The well-known iterative Weiszfeld does not converge efficiently to the optimal solution when the solution either coincides or nearly coincides with one of the demands point which is not the optimum. We propose a modified Particle Swarm Optimization (PSO) algorithm. The velocity update of the PSO is modified to enlarge the search space and enhance the global search ability. The preliminary results of these algorithms are analyzed and compared.
Model of the agricultural engineering enterprise innovation program development
Authors: Shaporova Z E , Tsvettsykh A V
Published: June 2019

Changes in the economic and technological conditions of functioning of the agro-industrial complex of Russia impose new requirements on the production potential of agricultural engineering enterprises. It becomes necessary to implement innovative projects that create prerequisites for a successful transition of enterprises to the export model of activity. The solution of this task is possible only on the basis of the production of innovative technologies and equipment that increase labour productivity, reduce the costs of material and labour resources in the production of an enterprise of the agro-industrial complex. The paper proposes a mathematical model for the formation of an effective innovation program for an agricultural engineering enterprise. The main criteria for an effective innovation program were: maximization of the net, reduced result of the innovation program, compliance of the innovative technology and technologies (innovation projects) being implemented to the requirements of high energy efficiency, productivity (productivity). These criteria make it possible to assess the effect of integration as the main feature of strategic synergies achieved in the formation of an innovative program involving the implementation of mutually complementary innovative projects.
Surface waves with negative phase velocity supported by temperature-dependent hyperbolic materials
Authors: Mackay Tom G , Lakhtakia Akhlesh
Published: June 2019

A numerical investigation was undertaken to elucidate the propagation of electromagnetic surface waves guided by the planar interface of two temperature-sensitive materials. One partnering material was chosen to be isotropic and the other to be anisotropic. Both partnering materials were engineered composite materials, based on the temperature-sensitive semiconductor InSb. At low temperatures the anisotropic partnering material is a non-hyperbolic uniaxial material; as the temperature is raised this material becomes a hyperbolic uniaxial material. At low temperatures, a solitary Dyakonov wave propagates along any specific direction in a range of directions parallel to the planar interface. At high temperatures, up to three different surface waves can propagate in certain directions parallel to the planar interface; one of these surface waves propagates with negative phase velocity (NPV). At a fixed temperature, the range of directions for NPV propagation decreases uniformly in extent as the volume fraction of InSb in the isotropic partnering material decreases. At a fixed volume fraction of InSb in the isotropic partnering material, the angular range for NPV propagation varies substantially as the temperature varies.
Public Transportation Use and Cognitive Function in Older Age: A Quasiexperimental Evaluation of the Free Bus Pass Policy in the United Kingdom
Authors: Reinhard Erica , Carrino Ludovico , Courtin Emilie , van Lenthe Frank J , Avendano Mauricio
Published: June 2019

In this quasiexperimental study, we examined whether the introduction of an age-friendly transportation policy—free bus passes for older adults—increased public transport use and in turn affected cognitive function among older people in England. Data came from 7 waves (2002–2014) of the English Longitudinal Study of Ageing (n = 17,953), which measured total cognitive function, memory, executive function, and processing speed before and after the bus pass was introduced in 2006. The analytical strategy was an instrumental-variable approach with fixed effects, which made use of the age-eligibility criteria for free bus passes and addressed bias due to reverse causality, measurement error, and time-invariant confounding. Eligibility for the bus pass was associated with a 7% increase in public transport use. The increase in public transportation use was associated with a 0.346 (95% confidence interval: 0.017, 0.674) increase in the total cognitive function z score and with a 0.546 (95% confidence interval: 0.111, 0.982) increase in memory z score. Free bus passes were associated with an increase in public transport use and, in turn, benefits to cognitive function in older age. Public transport use might promote cognitive health through encouraging intellectually, socially, and physically active lifestyles. Transport policies could serve as public health tools to promote cognitive health in aging populations.
svtools: population-scale analysis of structural variation
Authors: Larson David E , Abel Haley J , Chiang Colby , Badve Abhijit , Das Indraniel , Eldred James M , Layer Ryan M , Hall Ira M
Published: June 2019

Large-scale human genetics studies are now employing whole genome sequencing with the goal of conducting comprehensive trait mapping analyses of all forms of genome variation. However, methods for structural variation (SV) analysis have lagged far behind those for smaller scale variants, and there is an urgent need to develop more efficient tools that scale to the size of human populations. Here, we present a fast and highly scalable software toolkit (svtools) and cloud-based pipeline for assembling high quality SV maps—including deletions, duplications, mobile element insertions, inversions and other rearrangements—in many thousands of human genomes. We show that this pipeline achieves similar variant detection performance to established per-sample methods (e.g. LUMPY), while providing fast and affordable joint analysis at the scale of ≥100 000 genomes. These tools will help enable the next generation of human genetics studies.

Availability and implementation

svtools is implemented in Python and freely available (MIT) from https://github.com/hall-lab/svtools.

Supplementary information

Supplementary data are available at Bioinformatics online.
Microbial dysbiosis and polyamine metabolism as predictive markers for early detection of pancreatic cancer
Authors: Mendez Roberto , Kesh Kousik , Arora Nivedita , Di Martino Leá , McAllister Florencia , Merchant Nipun , Banerjee Sulagna , Banerjee Santanu
Published: June 2019

The lack of tools for early detection of pancreatic ductal adenocarcinoma (PDAC) is directly correlated with the abysmal survival rates in patients. In addition to several potential detection tools under active investigation, we tested the gut microbiome and its metabolic complement as one of the earliest detection tools that could be useful in patients at high risk for PDAC. We used a combination of 16s rRNA pyrosequencing and whole-genome sequencing of gut fecal microbiota in a genetically engineered PDAC murine model (KRASG12DTP53R172HPdxCre or KPC). Metabolic reconstruction of microbiome was done using the HUMAnN2 pipeline. Serum polyamine levels were measured from murine and patient samples using chromogenic assay. Our results showed a Proteobacterial and Firmicutes dominance in gut microbiota in early stages of PDAC development. Upon in silico reconstruction of active metabolic pathways within the altered microbial flora, polyamine and nucleotide biosynthetic pathways were significantly elevated. These metabolic products are known to be actively assimilated by the host and eventually utilized by rapidly dividing cells for proliferation validating their importance in the context of tumorigenesis. In KPC mice, as well as PDAC patients, we show significantly elevated serum polyamine concentrations. Therefore, at the early stages of tumorigenesis, there is a strong correlation between microbial changes and release of metabolites that foster host tumorigenesis, thereby fulfilling the ‘vicious cycle hypothesis’ of the role of microbiome in health and disease states. Our results provide a potential, precise, noninvasive tool for early detection of PDAC, which may result in improved outcomes.