bluuebunny/crossref_metadata_2025_split huggingface dataset:
Analysis of structures of energy conversion complexes of spacecraft power supply systems in development of their digital control systems
Authors: Kabirov V A , Vintonyak N P , Tyunin S S , Borodin D B , Semenov V D , Shinyakov Yu A 
Published: December 2019

Abstract
The paper discusses the principle of construction of automatic control systems for the energy conversion complex of a spacecraft with a digital control system. It is shown that the proposed digital control system is able to solve all the tasks assigned to it. The results are tested on an experimental model.
Creating an algorithm for improving the working surfaces of tools, using computer modeling
Authors: Kruglov A I , Zubarev Y M , Zhelnov D V , Shvetsov I V 
Published: December 2019

Abstract
The issue in question relates to machine building, particularly to machining of metals. We used the approach and software environment allow comparison with other aforementioned approaches and software environments to more accurately simulate the stress state of the material of the tool and, thereby, to increase accuracy of the design parameters of the tool for specific operating conditions. Introduction of automated systems of metals is directly related to the device status monitoring process of metal cutting, work process and increase its efficiency in the conditions of limited use of staff. Tasks of further improvement of machine-building production are inextricably linked with the effective use of technological equipment. Improving the efficiency of CNC machine tools is limited “hard” daemon setting the specified modes of the metals, when not taken into account peculiarities of processing of a concrete detail and lays the modes for the most demanding conditions.
Basic factors of modeling and optimization of technological processes of construction production
Authors: Naumova O S 
Published: December 2019

Abstract
The article analyzes the main goals, objectives, directions of modeling and optimization of technological processes of construction production. The basic tasks and factors of organizational and technological modeling of construction industry, as well as their influence on the change in production volumes, labor productivity growth and the efficiency of construction enterprises have been determined. The main directions of optimization of technological processes of construction production are formulated based on the modernization and development of production and technological capabilities of construction enterprises.
The results of simulation modeling of the operation of the regenerative fifth wheel hitch of a timber trailer
Authors: Nikonov V O , Posmetev V I , Posmetev V V 
Published: December 2019

Abstract
A three-dimensional mathematical model of the movement of a timber hauler with a semi-trailer along an uneven supporting surface and a computer program developed on its basis are presented that made it possible to evaluate the possibility of equipping the fifth-wheel coupling with an energy recovery system in various driving modes and to study the effect of recovery system parameters on its efficiency.
Estimation of energy secrecy of low-frequency satellite communication system with arbitrary number of spatial diversity reception of signals
Authors: Pashintsev V P , Chipiga A F , Kostyuk D V , Mikhajlichenko R M 
Published: December 2019

Abstract
The imitational model for the low-frequency satellite communication system has been developed using Simulink Ver. 8.2 (MATLAB) environment. The imitational modeling has been carried out for the signal reception with carrier frequencies in f0
≈ 0 30 MHz…1 GHz range and with both single antenna (n=1) and diversified (n=2, 4, 8 antennas) signal reception. On this basis, the dependency of energetic concealment coefficient on the carrier frequency selection has been determined. The analysis of the obtained dependencies shows that in the lowered frequency range (f

0
≈ 30 MHz … 100 MHz) it is possible to increase the energetic concealment coefficient by γ
e(2)
≈ 24 dB when using the dual antenna reception system and up to γ
e(8)
≈ 42 dB when the signal is received by 8 antennas.
Model of stress-strain state of wooden rod under eccentric compression and transverse load
Authors: Varenik A S , Varenik K A 
Published: December 2019

Abstract
The analytical model of the stress-strain state of a wooden compressed-bent rod at short-term loading by forces with unequal eccentricities and at presence of transverse loading is offered. In the calculation model the real diagrams of work of wood on compression and stretching are laid. The approximation of the curved compression chart takes into account the elastic-plastic properties of the wood. The method allows to solve the problem of determination of the limiting bearing capacity both by the criterion of buckling and by criteria of durability. The theoretical results are confirmed by experimental data and can be used for practical calculations of compressed-bent elements.
The use of industrial waste and cullet for building foam glass
Authors: Varenik K A , Varenik A S , Kirillov A V , Shuvalov M V 
Published: December 2019

Abstract
There is a huge raw material base for the production of foam glass. The aim of the work was to develop a technology for producing foam glass from cullet and industrial waste. Glass makes about 5% of municipal waste. Calcium carbonate which is the waste of ANP fertilizer production can be used as a foaming agent. The research task was to obtain effective heat-insulating and structural and heat insulating material with the corresponding physical and mechanical characteristics for low-rise and high-rise construction. The analysis of existing approaches to the production of foam glass was carried out in the course of the work, laboratory study of various mixtures composition was held and optimal mixtures of cullet and a foaming agent were proposed. Experiments showed that the density of foam glass made from different kinds of glass differs by up to 15%, which makes it possible to dispense with the expensive operation of sorting cullet.
EEG Signal Radio Frequency Control Wheeled Robot Based on Bi-objective Chaotic Particle Swarm Optimization Algorithm
Authors: Guan Shan , Liu Xingwang 
Published: December 2019

Abstract
Aiming at the EEG signal radio frequency control problem of EEG signal radio control wheeled robot traversing multiple objective points, a new method of EEG signal radio frequency control that integrates the bi-objective chaotic particle swarm optimization (BCPSO) is put forward. This method transforms the selection of objective points into the EEG signal radio frequency control problem and makes optimization by using the ant colony algorithm. The EEG signal control function between the two objective points is defined, and the particle swarm optimization algorithm is applied for optimization. Given the premature phenomenon of particle swarm optimization algorithm, the inverse learning strategy is introduced into the particle swarm optimization algorithm, and the inertia weight and learning factor of the particle swarm optimization algorithm are improved. The performance test results show that the bi-objective chaotic particle swarm optimization algorithm can effectively prevent the premature particle phenomenon and improve the optimization capacity and stability of the particle swarm optimization algorithm.
Research on Interactive System of Science Exhibition Based on Leap Motion
Authors: Zhongliu An , Xin Zou 
Published: December 2019

Abstract

Objective In order to explore the application of non-contact interaction in Science exhibition, an interactive system of science exhibits based on leap motion technology is proposed. Method Based on the Leap motion-based Science exhibition interactive system, the design of a “planetary story” science exhibit with interactive experience is evaluated according to three interactive experience indicators: realism level, learning pressure level and pleasure level. In this way, the feasibility of Leap motion technology in the popular science interactive system is verified. Result The use of the Leap motion gesture interaction library, combined with Unity3D development tools, to design science exhibits. Conclusion By proposing an Science exhibition interactive system based on Leap motion, it provides a design theory for the development of popular science exhibits. At the same time, the combination of Leap motion and popular science exhibits improves the user’s interactive experience and meets users’ interest in popular science content.
Creative Design of Transmission Device for Workpiece Transfer in Production Line
Authors: Ge Rongyu , Xin Miaomiao , Wu Jialiang , Ni Xiaomei 
Published: December 2019

Abstract
It is necessary for the workpiece transfer system in the production line to realize periodic indexing and reciprocating oscillation motion. In view of the complicated structure of the traditional transmission device and the need of multiple driving motors, a creative design integrating the indexing transmission and the oscillating transmission is made based on the globoidal cam mechanism. Taking the material transfer system in the LED beam splitter as a design example, structural design and 3D modeling were carried out, and the 2D drawings were obtained. The virtual prototype of the overall transmission is established by the dynamic simulation software ADAMS and the angular displacement of the three output shafts is simulated. The simulation results verify that the scheme can meet the requirements of the workpiece transfer system.
Thermodynamic Prediction Model of Single-stage Gradational Lead Screw Vacuum Pump
Authors: Zhao Fan , Han Feng , Sun Kun , Zhang Shi-Wei , Yue Tai , Li Jin-Ming 
Published: December 2019

Abstract
As a kind of fluid machinery, screw vacuum pumps are widely used in material engineering and semiconductor industry. Nowadays, new requirements for screw vacuum pumps are put forward on low energy consumption and low manufacture cost. Compared with the constant lead screw (CLS) vacuum pump, the gradational lead screw (GLS) vacuum pump has many advantages. Taking the SGLS vacuum pump as the research object, this paper divides the pumping process into four small stages and proposes a thermodynamic model to analyse the performance. The characteristic curves under diverse operating conditions are drawn and the energy consumptions are illustrated at the end of this paper. The results show that a thermodynamic model can provide a well explanation on the phenomena of pressure pulsation and power consumption, which will help us to understand the outstanding performance of SGLS vacuum pump better.
Tool for Teaching Physical Model Making in Product Design
Authors: Das Supradip , Das Amarendra Kumar 
Published: December 2019

Abstract
As physical prototypes and models can solve many design issues during the New Product Development (NPD) process, it has been introduced as an essential course in many design schools. With the advancement of 3D CAD technologies students find it easier to make digital models, but they find the physical prototyping and model making difficult. This difficulty arises due to lack of understanding of materials, processes and product form correlation required for physical prototyping. In order to address this issue, a tool has been developed and introduced to design students. The tool would guide them to select materials and processes, based on the product form. The tool is a matrix of variables viz. product form, processes and materials. To formulate this matrix, altogether three hundred fifty numbers of products were considered, and clustered them according to their form and processes. On this basis, possible materials have been identified for fitment and suitability of the processes. The tool has been tested with two groups of design students in the course of ‘modelling and simulation’. The effectiveness of the tool has been analysed by conducting an independent t-test and also the Felder-Silverman Index of learning. It has been observed that the tool is highly effective. This paper discusses this effort in details.
Researching impact of pressure re-distribution along the length of the track ground contacting area on resistance of the timber-hauling vehicles’ travel over snow
Authors: Klubnichkin Evgeny , Klubnichkin Vladislav , Erkhov Alexander , Alyabiev Alexey 
Published: December 2019

Abstract
The tracked timber-hauling vehicles which operate in the cutting areas having highly deforming soil, virgin snow in particular, feature significantly reduced performance due to rutting and caused frontal resistance.
Most logging enterprises harvest bulk timber in I and IV quarters of the year. However, deep snow during the second half of winter significantly reduces performance of the dragging tractors. Snow mostly affects performance of the feller-skidders and feller-bunchers which need to move from tree to tree to collect load while frequently crossing deep virgin snow.
Snow 0.4-0.6 m deep slightly resists to movement. However, when virgin snow is 0.7 m and deeper, the resistance rises sharply.
The tracked vehicle capacity to cross virgin snow can be improved in two ways: by improving friction properties and by reducing motion resistance. As is evident, more even distribution of track pressure and lack of pressure concentration under individual rollers will improve vehicle’s hauling power by reducing frontal resistance.
But as researcher M.G. Bekker stated, despite the fact that pressure distribution was considered one of the most important factors determining vehicle’s performance, the theoretical research and assessment of the problem was frequently neglected.
Today designers while designing new tracked dragging vehicles and assessing their performance refer to the researches made for industrial and agricultural tractors. This can be explained by few works dedicated to researching performance of the forest tracked vehicles. The design and operating conditions of the forest and non-forest vehicles are much different so that the results of research made for one type of vehicles cannot be applied to other types of vehicles.
That is why it is necessary to research the process of tracks’ impact on snow and pressure re-distribution due to snow reaction to justify parameters of the tracked undercarriage of the forest vehicles, provide optimized location of the gravity center and reduce motion resistance.
Our work is aimed to develop a method to estimate pressure distribution along the length of the track ground contacting area, test the method with experiment and provide recommendations to designers on improving oversnow performance of the forest tracked vehicles.
Autonomous control system prototype for GAZ A65R32
Authors: Tiurikov M. I. , Malinin N. V. , Evdokimova T. S. , Sinodkin A. A. , Fedosova L. O. 
Published: December 2019

Abstract
The article presents current state of development of autonomous control system prototype for GAZ A65R32. The solutions for mapping and localization, planning, used sensors, as well as the applied methods of computer vision and deep learning and the methods used to transfer data in the system are described.
Designed gearbox reliability assessment techniques based on the real one
Authors: Yusupov R.R. , Yarzhemsky A.D. , Alexeyev A.V. , Korchazhkin M.G. , Berdnikov L.A. 
Published: December 2019

Abstract
The paper shows the designed gearbox reliability assessment and analysis on the basis of the real one. The basic diagram has been analyzed as well as the units’ eventual failures. Based on the designed structural diagram of the SU gearbox reliability level has been estimated. The measures to raise the reliability level have been proposed.
Choice of metal materials for responsible parts and vehicle assemblies operating under the conditions of low temperatures
Authors: Kabaldin Y.G. , Khlybov A.A. , Anosov M.S. , Shatagin D.A. , Golovin A.A. , Scriabin M.D. 
Published: December 2019

Abstract
The purpose of the present study is to evaluate the cold resistance and develop an algorithm for selecting metals that are widely used for manufacturing critical parts and components of vehicles operating in a wide range of low temperatures.
To achieve this goal, the tests were made on impact bending of the studied metals in the temperature range of climatic cold, followed by the study of fractures of metal samples.
The studies were carried out using methods of optical and electron microscopy and fracto-graphic studies. During the study, data were obtained on the change in toughness, the mechanisms of metal destruction for a wide range of low temperatures, as well as the temperature of the viscous-brittle transition of the studied metals.
It has been found that materials with an FCC and HCP lattice exhibit greater resistance to fracture at low temperatures. It is shown that a change in the fracture mechanism is closely related to their crystal structure features and thermal conductivity.
As a result of the research, an algorithm for the selection of cold-resistant materials was developed, and on its basis- a program.
Estimate of elastomer elastic members’ impact on the vehicle ride quality, mobility and reliability in low temperatures
Authors: Molev Y. , Proshin D. , Stepanov E. , Maleev S. , Mavleev I. , Salakhov I. 
Published: December 2019

Abstract
Tough competition and stringent requirements force car producers to pay special attention to vehicle mobility and reliability in low temperatures. Suspension has a great impact on vehicle mobility and reliability together with tyres being a structural unit protecting the vehicle from the road dynamic effects. Enhancement of these car characteristics is possible by using advanced materials in the suspension structure. Such materials have the necessary strength characteristics, long service life and high resistance to external factors action. Elastomer elements application as suspension elastic-damping members is estimated in the paper. The estimate is based on calculation analysis, mathematic modelling and bench and road test results. A comparative analysis with existing structures has been carried out highlighting both advantages and disadvantages and types of vehicles where elastomers can be most efficiently used have been determined.
Hybridization Effects of S-glass fiber on Charpy impact resistance of carbon/aramid fiber reinforced epoxy composite laminates
Authors: Alsaadi Mohamad 
Published: December 2019

Abstract
The objective of the present research work is to investigate the Charpy impact behavior of intraply hybrid carbon/aramid fabric layers with S-glass fabric layers composite laminates for asymmetric and symmetric arrangements. The hybridization effects on Charpy impact characteristics for carbon/aramid with S-glass hybrid composite laminates were compared with those of carbon/aramid/epoxy composite laminates and S-glass/epoxy composite laminates. Deformation degree, impact energy and impact strength were strongly affected by the position and number of carbon/aramid layers in addition to the impact side direction due to variation of impact properties between carbon/aramid fibers and S-glass fibers. Using S-glass layers instead of carbon/aramid layers exhibited decreasing in the deformation level particularly for carbon/aramid side impact in addition to improve the impact strength of the hybrid composite.
Textured multilayered piezoelectric structures for energy conversion
Authors: Haugen Astri Bjørnetun , Ringgaard Erling , Levassort Franck 
Published: December 2019

Abstract
Piezoelectric materials are essential for the conversion between mechanical and electrical energy, for example in ultrasound imaging and vibrational energy harvesting. Here, we are making and exploring the effects of a new design: co-sintered multilayers with texture (grains of a preferential crystallographic direction). The motivation is the combination of increased piezoelectric response in certain crystallographic directions; multilayer structures where thick films rather than bulk materials can allow higher frequency operation and large area; and co-sintering to avoid detrimental effects from gluing layers together. Samples of the lead-free piezoelectric material Li0.06(K0.52Na0.48)0.94Nb0.71Ta0.29O3 with 0.25 mol% Mn (KNNLTM) were made by tape casting and co-sintering. NaNbO3 platelets with (100) orientation which were used as templates to introduce texture, and polymethyl methacrylate (PMMA) was used as a pore forming agent for making porous substrates. The electrical impedances of the co-sintered samples were recorded and analyzed by equivalent electrical circuit modelling. A texture up to 85% in the [100] crystallographic direction was obtained. The samples displayed ferro- and piezoelectricity, with a maximum thickness coupling coefficient (kt = 0.18) between mechanical and electrical energy in the most textured sample. This demonstrates that the introduction of texture in multilayered, co-sintered piezoelectrics shows promise for improving devices for ultrasound imaging or energy harvesting.
CpGtools: a python package for DNA methylation analysis
Authors: Wei Ting , Nie Jinfu , Larson Nicholas B , Ye Zhenqing , Eckel-Passow Jeanette E , Robertson Keith D , Kocher Jean-Pierre A , Wang Liguo 
Published: December 2019

Abstract

Motivation
DNA methylation can be measured at the single CpG level using sodium bisulfite conversion of genomic DNA followed by sequencing or array hybridization. Many analytic tools have been developed, yet there is still a high demand for a comprehensive and multifaceted tool suite to analyze, annotate, QC and visualize the DNA methylation data.

Results
We developed the CpGtools package to analyze DNA methylation data generated from bisulfite sequencing or Illumina methylation arrays. The CpGtools package consists of three types of modules: (i) ‘CpG position modules’ focus on analyzing the genomic positions of CpGs, including associating other genomic and epigenomic features to a given list of CpGs and generating the DNA motif logo enriched in the genomic contexts of a given list of CpGs; (ii) ‘CpG signal modules’ are designed to analyze DNA methylation values, such as performing the PCA or t-SNE analyses, using Bayesian Gaussian mixture modeling to classify CpG sites into fully methylated, partially methylated and unmethylated groups, profiling the average DNA methylation level over user-specified genomics regions and generating the bean/violin plots and (iii) ‘differential CpG analysis modules’ focus on identifying differentially methylated CpGs between groups using different statistical methods including Fisher’s Exact Test, Student’s t-test, ANOVA, non-parametric tests, linear regression, logistic regression, beta-binomial regression and Bayesian estimation.

Availability and implementation
CpGtools is written in Python under the open-source GPL license. The source code and documentation are freely available at https://github.com/liguowang/cpgtools.

Supplementary information
Supplementary data are available at Bioinformatics online.