bluuebunny/crossref_metadata_2025_split huggingface dataset:
Cortical and spinal excitabilities are differently balanced in power athletes
Authors: Grosprêtre Sidney , Bouguetoch Amandine , Martin Alain 
Published: June 2019

AbstractIt is recognised that power‐sport practices have a particular effect on lower‐limb neuromuscular parameters. Less is known about corticospinal network adaptation, however, or whether these adaptations are specific to the lower limb. In the present study, the corticospinal and spinal excitabilities of upper and lower limbs have been examined in a group of untrained participants (UT, n = 10) and compared to those of a group of well‐trained athletes practicing parkour (PK, n = 10). This activity, consisting of overcoming obstacles offered by the urban environment, was chosen as a model of power activity. The motor evoked potentials (MEPs) induced by transcranial magnetic stimulations and H‐reflexes and maximal M‐waves evoked by peripheral nerve stimulations were elicited in both upper‐ (flexor carpi radialis [FCR]) and lower‐limb muscles (soleus [SOL] and gastrocnemius medialis [GM]). The results tended toward an overall greater corticospinal excitability in PK than in UT (as evidenced by greater MEP/Mmax ratio) and lower spinal excitability (lower Hmax/Mmax). H/MMAX ratio was lower for PK (0.32) than for UT (0.41) in SOL (p = 0.02), while MEP/MMAX was greater for PK than for UT in FCR (PK: 0.12; UT: 0.06; P = 0.04) and in GM (PK: 0.05, UT: 0.03, P = 0.02). In both limbs, the decrease of spinal excitability induced by parkour practice was counterbalanced by an increase in cortical excitability. Finally, the present study indicates that such long‐term power practice leads to similar corticospinal plasticity in upper and lower limbs, explained by the similar solicitation of those muscles.
Photoacoustic tomography with direction dependent data: an exact series reconstruction approach
Authors: Zangerl Gerhard , Moon Sunghwan , Haltmeier Markus 
Published: June 2019

Abstract
Photoacoustic image reconstruction often assumes that the restriction of the acoustic pressure on the detection surface is given. However, commonly used detectors often have a certain directivity and frequency dependence, in which case the measured data are more accurately described as a linear combination of the acoustic pressure and its normal derivative on the detection surface. In this paper, we consider the inverse source problem for data that are a combination of the acoustic pressure and its normal derivative. For the special case of a spherical detection geometry we derive exact frequency domain reconstruction formulas. We present numerical results showing the robustness and validity of the derived formulas. Moreover, we compare several different combinations of the pressure and its normal derivative showing that used measurement model significantly affects the recovered initial pressure.
The effect of NaOH concentration variation in the process of paper making from bamboo fiber
Authors: Dulmalik  , Dwiky MI , N Kumala S , Fety IR , Khaliq FN 
Published: June 2019

Abstract
Bamboo cropping period is quite short compared to wood, but fiber and bamboo pulp have not been optimally used as a substitute for wood in composite industry, such as fiber board. It is worth to be investigated because of the availability of wood is declining. Therefore, this research aimed at revealing the use of fiber and bamboo pulp (G. apus) for fiberboard. The study was conducted using bamboo fibers from bamboo strips cooked with soda process and bamboo pulp from chips of bamboo cooked with soda process and Kraft process. Composite of bamboo fiber is made with a variety of fiber weight fraction to the epoxy resin matrix. Furthermore composite of bamboo pulp is made under optimal condition for making fiber composite. Based on the test results, it is known that the quality of the bamboo fiber composite from bamboo strips cooked with soda process is better than the composite of bamboo pulp. Besides, the produced bamboo fiber composites can be categorized as the high-density fiberboard meanwhile for the aspect of water content, water absorption, length and thickness changes, flexural strength and modulus of elasticity are in accordance with applicable standard for fiberboard (SNI 01-4449 - 2006).
Android-based applications on teaching skills based on TPACK analysis
Authors: Utami P , Pahlevi FR , Santoso D , Fajaryati N , Destiana B , Ismail ME 
Published: June 2019

Abstract
Teaching skills learned in micro-teaching are important competencies in the learning management. Dependence of other parties, both lecturers and colleagues teaching during the assessment process of teaching practice and lack of media that integrates the concept of material, examples, and practices are obstacles in mastering teaching skills. This article describes the specifications needed of an Android-based learning tool (media) for microteaching (“Microteaching”) courses and analyzes the performance of these learning media. The development phase begins with Analysis, Design, Development, and Evaluation. The results of the analysis referring to TPACK and the design showed that the specifications of the Android-based media consisted of two main menus namely material (containing various multimedia elements) and assessment (besides text-based assessment also contained speech recognition elements). The performance of “Microteaching” in functionality is 100% successful, while the feasibility test at the evaluation stage not only for media experts, but material experts and users indicates that the media is suitable for use. Furthermore, results of the assessment show that the media is able to depend on the assessment, except from the aspect of verbal aspects. Integration of learning concept material through mind maps, technical examples related to verbal teaching skills and videos to provide concrete description of how to teach (both verbal and non-verbal).
Developing a control system for a racket-wielding robot using a combination of promoximity sensor and pneumatic actuator to optimize shuttlecocck hit
Authors: Khairudin M , Soeharto  
Published: June 2019

Abstract
This study aims at developing a stroke control system in a racket-wielding robot using a combination of proximity sensor and pneumatic actuator to optimize a shuttlecock hit. As the shuttlecock can come at any time and from any directions, this racket-wielding robot is developed to produce accuracy in its serving distance, service timing, and arm swing, resulting in an optimum hit. A research and development method was employed in this study with every stage of the sub-system development was tested for evaluation and revision. This study has developed and implemented a prototype of a stroke control system for a racket-wielding robot on the bases of proximity sensor and pneumatic actuator. The shuttlecock-wielding arm has functioned properly with a success rate of 100%, while the achieved hitting rate was 70%.
Basic communication skill drill in microteching context to improve the teching skills of civil engineering and planning education students, faculty of engineering, Yogyakarta State University
Authors: Suparman  , Slamet  , Pratama GNIP 
Published: June 2019

Abstract
This study aims to investigate whether the drill method (verbal and non-verbal communication skill drill) is able to improve the basic teaching skills in microteaching context. This is classroom action research. The population consisted of students majoring in Civil Engineering and Planning Education Department, Faculty of Engineering, Yogyakarta State University who were taking microteaching practice course. The sample of the study was class A1 consisted of 11 students. The study was conducted in three cycles. Cycle 1 contained basic verbal communication, cycle 2 encompassed basic non-verbal communication, and cycle 3 covered both basic verbal and non-verbal communication types. Observation and skills assessment sheets were employed. The qualitative descriptive and descriptive statistics methods were then used to analyze the data.The results show that: (1) basic verbal communication skill drill in microteaching practices improves student teachers’ basic microteaching skills and (2) basic non-verbal communication skill drill in microteaching practices improve student teachers’ basic microteaching skills.
Home-made PLC laboratory training set for limited budget vocational education institution
Authors: Sunomo  , Asmara A 
Published: June 2019

Abstract
The objective of this study is to build a low voltage three phase 24/41-volt programmable logic controller (PLC) lab. experiment training set for vocational education institution with limited budged. The training set is very cheap, durable and save from electric shock hazard due to no other and no higher voltage used for running it. The 12 I-O PLC unit using ATMEGA 16 processor, programmed by LD micro ladder diagram software on the laptop connected to the PLC module. The loads are: two units three phase motor modified from washing machine motor with specific designed, three phase electronic magnetic contactor, three modified motorcycle bulb lamp and one buzzer. The training set equipped with two version protection; electronic phase failure for the three phase source and electronic fuse destroyer in every unit module. The 24/41 volt three phase source will be blackout one second after one of the 8 ampere three phase fuse become off by overload condition or destroy due to a wrong connection of the individual module from phase to neutral (24 volt) become phase to phase(41volt). The evaluation result from the three internal department of PLC programmer expert and five vocational secondary school (SMK) teachers in Yogyakarta shows that the unit works well as it intended.
3D aerosol printing of new low-temperature ceramic layers and coatings based on polyaluminosilicates filled with highly dispersed fillers used in microelectronics and medicine
Authors: Ivanov A A , Polyushko V A 
Published: June 2019

Abstract
A new low temperature ceramic material for 3D printing based on polyaluminosilicate has been synthesized. Some of the synthesis stages are controlled by the parameters set for 3D aerosol printing. The processes of 3D aerosol printing of polyaluminosilicates filled with a highly dispersed filler have been studied. An optimal method for aerosol generation has been chosen that does not affect the supramolecular structure of a polyaluminosilicate binder. Ceramic dielectric topologies with high thermal conductivity and layer thickness in the nanometer range have been obtained by means of 3D aerosol printing of the synthesized material for the first time.
Model of fuzzy estimation of mechanical stress concentration for aerospace and industrial flat structures with polygonal holes of uncertain curvature at rounded corner points
Authors: Vyskub V G , Mutina E I , Storozhev S V , Storozhev V I 
Published: June 2019

Abstract
The problem of uncertainty factor management in the description of mechanical stress nearby hatchways of multilateral form with rounded corners of fuzzy curvature in stretch thin plate is considered. Numerical and analytic methodology based on heuristical principle application of extension to transition to fuzzy set arguments in special analytical representations for estimated factors of stress concentration is proposed. Algorithm of fuzzy interval parameter spread of curve in corner points is described. Usage of proposed methodology in theoretical and applied researches on integrity problems of multiply connected thin-walled structure elements is characterized.
Decrease in mechanical properties, transient brittleness temperature, fatigue strength and corrosion resistance of Fe-C alloys
Authors: Ermakov Boris , Vologzhanina Svetlana , Bobrovskij Sergej , Ermakov Sergej , Kanatnikov Nikita , Khaimovich Alexander , Melnik Jurij 
Published: June 2019

Abstract
The paper presents the results of studies on the availability and resistance to brittle fracture of perspective austenitic chromium-nickel-manganese cryogenic steels, depending on the concentration and ratio of the nitrogen and vanadium content. The optimum content of these elements in deformed steels determined, the results of the studies and recommendations on the doping system are confirmed by the results of full-scale tests of low-temperature equipment under internal pressure in liquid nitrogen.
Flow with heat transfer in a rotating cavity
Authors: Zuev A A , Arngold A A , Tolstopyatov M I , Khodenkova E V , Nazarov V P 
Published: June 2019

Abstract
An integral relation of the temperature spatial boundary layer energy equation, which allows integration over the surface of any shape to determine the thickness of the energy loss, was obtained. The equations for determining the energy loss of the temperature spatial boundary layer thickness are necessary to determine the local heat transfer coefficients for the characteristic cases of flow, taking heat exchange into account. The corresponding flows in the power unit cavities are considered. Turbulent flows of a gaseous flow were considered. Calculations for local heat transfer coefficients are defined. The local heat transfer coefficient for a rectilinear flow, a rotational flow according to the law of a solid, and a rotational flow according to the law of a free vortex were determined. Calculations for local heat transfer coefficients are defined as Stanton Criteria.
Durability prognostication of ferroconcrete structures on the basis of neural indistinct networks
Authors: Tkalich S A , Taratynov O Yu 
Published: June 2019

Abstract
The paper considers possible application of modern prognostication techniques as an element of a quality control system. Applied mathematical tools are the artificial indistinct neural networks with the inverse distribution of a TSK type architecture error. The analysis is made of the factors influencing the ferroconcrete durability. The selected input characteristics are: the sand fineness module, the number of of a lamellar and needle-shaped grains in crushed stone, cement volume weight, of a cement stone strength. The output parameter is the arithmetical mean value of the destroying force by the results of three experiments. The MS Access database was formed on the basis of the laboratory logbooks of the production input control. Two groups of tuples are formed: for training of indistinct neural network and for adequacy tests of the trained network. Mathematical model showed the efficiency of testing. The average error value was 9.6 kg/cm2 or 2%.
Method of crack-free laser writing of microchannels on glass substrates
Authors: Baev Sergey , Bessmeltsev Victor , Goloshevsky Nikolay , Katasonov Denis 
Published: June 2019

Abstract
Approaches to the problem of the formation of microchannels of arbitrary shape on optical glass substrates and other fragile materials without microdefects (cracks and chips) both on the surface of the substrate and inside the substrates are considered. Different approaches to the formation of laser beam trajectories within microchannels are considered. It was found that the raster scanning method improves the performance of the laser micromachining process and provides the ability to write structures of any length without longitudinal cracks with the energy characteristics of the laser spot in the focus much higher than those in the vector scanning method.
The influence of the melt cooling rate on shrinkage behaviour during solidification of aluminum alloys
Authors: Deev V B , Prusov E S , Shunqi M , Ri E H , Bazlova T A , Temlyantsev M V , Smetanyuk S V , Ponomareva S V , Vdovin K N 
Published: June 2019

Abstract
A comprehensive analysis of the shrinkage process during the crystallization of aluminum alloy castings was carried out. An assessment was made of the general nature of changes in filtration and shrinkage rates, as well as the width of the mushy zone, depending on the rate of crystallization of the melts. An analytical expression was proposed for determination of the critical value crystallization rate of the alloy from the standpoint of the probability of hot tearing in castings. The method of influence on crystallizing melts by vibration with the aim of reducing hot tearing is considered and experimental data confirming the effectiveness of this approach are given.
Russia and Kazakhstan cooperation in the aerospace industry to expand geospatial information use
Authors: Kovalev Igor V , Voroshilova Anna A , Piskorskaya Svetlana Yu , Seitov Bolat A 
Published: June 2019

Abstract
The problems and prospects of cooperation between Russia and Kazakhstan in the space industry are revealed, the significance of Baikonur and «Vostochny» cosmodromes in this process is revealed. The concepts of geospatial information, earth remote sensing data, trends in the spread of space research in various spheres of society are considered.
Modernization stages of the Industry 3.0 company and projection route for the Industry 4.0 virtual factory
Authors: Zakoldaev D A , Shukalov A V , Zharinov I O , Zharinov O O 
Published: June 2019

Abstract
The task is to create the Industry 4.0 company functioning on humanless and paperless principles of production. There are two ways how to complete this task. The option number one is to modernize the existing companies of the Industry 3.0 which means a smooth implementation into informative and production infrastructure of the company the components and technologies which guarantee a slow evolution of research and development institute and item designing companies. The option number two, the example given, is based on solution on some project tasks to choose the components and technologies in their iterative form. There is a scheme how to modernize an Industry 3.0 company and the expected results which allow to project with existing companies new digital factories and smart factories of the Industry 4.0. There is a route how to project systematically a virtual factory of the Industry 4.0 as the main company to support all stages of the item life cycle for different industries. Modernization quality criteria for project and production companies and creation of virtual factories define the economic criterion of company activity.
The projection of cyber and physical systems digital twins in the stage of production technological preparation of the Industry 4.0 smart factories
Authors: Zakoldaev D A , Gurjanov A V , Shukalov A V , Zharinov I O 
Published: June 2019

Abstract
The task is to create a cyber and physical system digital twin. Cyber and physical systems digital twins are components of the Industry 4.0 smart factories and is done with cloud services (resources) of digital production. The projection of cyber and physical systems digital twins is done in the stage of new type item technological production preparation (putting the item into production). If this is a wide cyber and physical system its digital twin is created in the digital factory and is part of cyber and physical system supply. The projection of digital twin must be done in connection with the physical part of this system projection. There is a scheme how to project the physical part of cyber and physical system. There is also a scheme how to project a virtual component of cyber and physical system (digital twin). The scheme base for the virtual component is the control program (information resource) and a set of clouds to automatize the project activity.
Features of the rotor dynamics of knife refining machines
Authors: Vikharev S N 
Published: June 2019

Abstract
The paper researches the features of the rotor dynamics of knife refining machines. The rotor of these machines turns in the pulp. The total imbalance of the refiner rotor consists of mechanical, hydraulic and hydrodynamic components. The mechanical imbalance of the refiner rotor changes due to the plate wear. In the knife refining machines, it is advisable to use automatic balancing devices to compensate for the imbalance of the rotor during operation of the refiner without stopping it. The methodology for calculating the beats of the rotor plate has been developed and tested. The operational cross-knife gaps of the knife refining machines are comparable to the beats obtained. It is recommended to eliminate gaps in the design of the rotor assembly, i.e. use bearings with tensioner and use a stator to make refiner adjustment. The developed methodology for calculating beats can be used in other similar machines, for example, in centrifugal pumps.
Conformity assessment of information on crushing equipment for agricultural raw materials: consequences of the lack of appropriate standards
Authors: Sekatskii V S , Merslikina N V , Pikalov Yu A , Morgun V N 
Published: June 2019

Abstract
The paper reviews the analysis of information about hammer (rotary) crushers for the production of compound feedstuff. It is shown that for the majority of crushers studied, the information is incomplete or unreliable, which is misleading for consumers purchasing this equipment. Measures to improve the quality of information on crushing equipment are proposed.
The strength of sawdust concrete, produced without mineral aggregates
Authors: Dolmatov S N , Nikonchuk A V , Martynovskaya S N 
Published: June 2019

Abstract
The construction industry widely uses concrete for various purposes. The addition of lightweight fillers to the compounding of concrete allows to obtain lightweight concrete with high heat-insulating indicators and a smaller mass. Various materials can be used as fillers, including industrial waste. The paper is devoted to the study of the properties of lightweight concrete with the addition of sawdust. As a result of experimental studies, the strength properties of sawdust concrete produced without the use of mineral fillers (sand) were determined. The positive effect of tempering the mixture with latex emulsion on the strength properties of sawdust concrete has been established. The strength characteristics of samples made with the addition of a latex emulsion were 3.65 MPa at a density of 1080 kg/m3. Such indicators allow using the material as a structural thermal insulation during construction.
Actual technical condition assessment of mine excavators’ slewing gear based on the operating oil parameters
Authors: Kudrevatykh A V , Ashcheulov A S , Ashcheulova A S 
Published: June 2019

Abstract
During mining equipment operation, great attention should be paid to durability and reliability increase of their units and assemblies, since the greatest number of equipment failures in Kuzbass mines occurs precisely because of the failure of excavators’ slewing gears. Today this very problem is relevant for coal mining enterprises. One of the ways to improve the reliability of gears is the introduction of additional technological processes to diagnose the mechanisms actual technical condition of an excavator-automotive complex. However, the equipment and methods used do not fully meet the requirements for a comprehensive analysis of the technical condition of gears. Thus, there is a strong need to develop a modern technique to diagnose assemblies, based on the parameters of the operating oil. With the help of experimentally identified dependencies of the oil temperature in a gear on the parameters of the operating oil, a mathematical model of the wear process of slewing gears rubbing parts was obtained; the mathematical model has the possibility to predict possible failures of excavators. The introduction of this model in production will significantly reduce the downtime of mining equipment in coal mines; it also will affect the reduction of total costs of enterprises.