bluuebunny/crossref_metadata_2025_split huggingface dataset:
Nuisance algae Gonyostomum semen (Raphidophyta) in water bodies of protected natural areas in Middle Volga region (Russia)
Authors: Umanskaya M V , Tarasova N G , Bykova S V , Yu Gorbunov M 
Published: December 2020

Abstract
The distribution if nuisance raphidophyte Gonyostomum semen in water bodies of protected natural areas of the Middle Volga region is analyzed. The abundance of the species was determined quantitatively in eight lakes using the method of fixation with mercuric chloride. In four more lakes, it was found by qualitative inspection of live samples. It develops mainly in lakes with high water color, reaching the cell number of 7.5 106 cells L1, but also occurs in clear-water lakes in minor abundance (10-1600 cells L−1). It has been demonstrated that some ciliate species e.g. Frontonia leucas can consume G semen cells and therefore partially control its abundance. Taking into account the presented data, this species was recorded in the plankton of lakes in all regions of the forest part of the Middle Volga basin. Thus, these results significantly expand the geography of the planktonic habitats of G semen in the whole Volga region.
Virtual Synchronous Control for Fuel Cell Power Generation System
Authors: Ge Yi , Zhao Yangyang , Li Hu , Tan Jian , Chen Hui 
Published: December 2020

Abstract
In this paper, the concept of FC-VSG is proposed to operate a fuel cell power generation (FC) as a virtual synchronous generator (VSG). In order to provide the sufficient frequency and voltage support for the grid, the grid inverter in such a FC-VSG system is controlled to generate an appropriate voltage similar to the conventional synchronous generator. As a result, the overall system behaves like a VSG, which is significantly different from simply controlling the FC as a current source. It is able to provide the hydrogen energy stored in the fuel tank as inertia to support the grid frequency and also to provide reactive power to support the grid voltage. Moreover, the system does not need a phase-locked loop (PLL), and the seamless transition between grid-connected mode and islanded mode can be easily achieved. Simulation results from a 1 MW fuel cell power generation connected to an AC grid is presented to demonstrate the feasibility and effectiveness of the strategy.
How Does Urban Park Affect People’s Health? An Empirical Study Based on Xiaoyaojin Park in Hefei
Authors: Wang Zhipeng , Xing Siyi , Zhang Bo , Liang Wanning , Zhu Yating 
Published: December 2020

Abstract
As one of the important forms of urban space, urban parks not only provide green space, but also support a variety of outdoor recreation activities. They play an important role in the life of urban residents’ sports, leisure and social interaction, and have great potential effect on promote people’s physical and mental health. This study used a questionnaire survey method, SF-12 health questionnaire was used to quantify the physical and mental health of park users. Satisfaction questionnaire was used to evaluate park users’ satisfaction with park characteristics. Multiple regression analysis was used to reveal the relationship between urban park and park users’ physical and mental health score. The results show that there is a positive correlation between the time of using the park, the satisfaction with the overall environment of the park and their scores of physical and mental health. Park users’ satisfaction with the activity facilities of the park is positively correlated with their physical health score, and their satisfaction with the plant landscape of the park is positively correlated with their mental health score. The conclusion shows that urban parks have a positive impact on people’s physical and mental health.
Prediction of the properties of photopolymer prototypes
Authors: Shumkov A A , Ablyaz T R , Muratov K R , Sidhu S S 
Published: December 2020

Abstract
The study of the mechanical properties of photopolymer material SI500. For the manufacture of experimental samples used the method of rapid prototyping stereolithography. The effect of process parameters on tensile and compression strength was studied. It was found that the mechanical strength of the samples is influenced by the layer thickness, exposure time, and additional processing in an ultraviolet chamber. The values of maximum tensile stresses, which are achieved when the layer is exposed for 30 seconds and additional processing, are determined. Changing the layer thickness does not significantly affect the values of maximum tensile stresses. The maximum is in the range from 53.4 MPa to 55.4 MPa. Values of maximum mechanical strength during compression of the samples is achieved with a flash of 10 seconds. The maximum compressive stresses range from 229 MPa to 230 MPa. Changing the layer thickness does not significantly affect the compressive strength.
Visualization models of technological heredity in mechanical engineering
Authors: Konoplin Alexander , Baurova Natalia , Abrakov Sergei 
Published: December 2020

Abstract
By the example of machine-building products the model of visualization of their quality indicators at different stages of life cycle is offered. It is shown that to visualize the influence of technological heredity on the quality indices of the product it is most demonstrative to use the graph theory and the Liebich metaphorical barrel. The proposed approach allows to use the principle of cybernetics, according to which the product, at each stage of its life cycle, is presented in the form of a set of separate elements connected with each other in a single information network. The joint use of the graph theory and the Liebich metaphorical barrel allows evaluating the studied indices and visually displaying them in the complex. The main advantage of this approach is the ability to illustrate which of the set of quality indicators of a particular product is most significant.
Heat model of a spindle support of a precesion metal cutting machine
Authors: Denisenko A F , Podkruglyak L Y 
Published: December 2020

Abstract
Based on the use of the electrothermal analogy in describing the heat transfer process, an engineering technique has been developed to determine the thermal state of the supports of spindle assemblies, which does not require “heavy” software packages based on the application of the finite element method. The design features of modern control rooms made it possible to reasonably present the thermal model in the form of a flat model. The principles of dividing the blocks of a flat model into enlarged elements are proposed, taking into account the features of the geometry of the calculated structure and heat sources. A technique has been developed for determining the thermal resistance of an element of a calculated thermal model taking into account boundary conditions. The use of enlarged elements of the thermal model makes it easy to assess the influence of technological features of processing and assembly of individual structural parts on its thermal state. The presented methodology for developing a thermal model can be used to estimate stationary thermal processes of any axisymmetric structures with insignificant temperature variations.
Thermal strengthening treatment of low-rigid lead screws
Authors: Bobrowski A V , Drachev O I , Turbin I V , Epishkin V E 
Published: December 2020

Abstract
The article deals with the design of equipment for thermal strengthening operations (hardening, tempering and normalization) of low-rigid long-length lead screws of high accuracy. The technology of thermal strengthening processing is given. In this paper, a new approach is proposed to the processing of lead screws and their treatment technology to obtain high geometric accuracy. Relatively long and thin products are characterized by common deviations of shapes from the straightness of the axis and the uneven pitch of the helix. The technological process of their production should include bending operations and multiple tempering to stabilize residual stresses. This ensures the straightness of the part and the stability of the thread pitch. As an effective method and promising direction, a thermal strengthening processing is proposed. Recommendations are given on technical methods of axial deformation and determination of the optimal modes of thermal strengthening. The principle of operation of the installation and algorithms of the technological process are described.
Improving lathe dynamics by workpiece - support subsystem control
Authors: Bobrovsky A V , Drachev O I , Epishkin V E 
Published: December 2020

Abstract
The article discusses the design of the lathe, the peculiarity of which is the equipment of it with three automatic control systems (ACS) of the workpiece-support subsystem. The first ACS ensures the stability of the workpiece axis during machining by controlling the self-centering supports (SCS). The second ACS controls the dynamics of the spindle assembly. The third ACS controls the axial clamping of the rear center, which enables machining low rigid small, long shaft-type workpieces for turning, grinding and milling spline slots. The use of ACS increases the accuracy, quality of machining and vibration resistance of the Lathe - Device - Tool - Workpiece (LDTW) system, which is achieved in all operations through automatic control of tool positions and the workpiece. In addition, the residual stress on the machined surfaces is reduced by introducing high-frequency vibrations into the cutting area at all operations.
Fuzzy control under uncertainty in machine building
Authors: Ablyazov V , Drachev O , Tisenko V 
Published: December 2020

Abstract
This report addresses the aspects of decision-making problems during asset management in cases when there is an uncertainty of the situation that can be caused by complexity of an asset or insufficient information about it. In last decades, the fuzzy logic proposed by Lotfi Zadeh has been successfully used in such cases. This report also considers positive and negative aspects of this form of logic and proposes using fuzzy converse logic (antonyms-related), which is free from weaknesses of fuzzy-related concepts proposed by Zadeh. We outline the basic axioms of converse logic and its application for decision-making problems during asset management under uncertainty.
Study of possibility to process the edges of the parts on the robot
Authors: Podashev D 
Published: December 2020

Abstract
The necessity to replace manual labour for mechanized and automatic is very actual for mechanical engineering. The possibility to implement the robot complex (RC) when processing the edges of the parts is studied in the report. Polymer-abrasive radial and end brushes were used as tools. Usage of processing of edges on RC by elastic polymer-abrasive brushes with different combination of surfaces on parts proved that such an operation can be implemented successfully with meeting all requirements on quality of processed edges.
Dependence of abrasive tool wear-resistance on abrasive grain microstrength
Authors: Bagaiskov Yu 
Published: December 2020

Abstract
Microstrength determined applying the microindentation method is an essential indicator of micromechanical properties of abrasive tools’ grains. Assessment is carried out according to the damage area dimensions and the imprint depth. The test results of various materials, including abrasive materials, in a friction machine revealed that relative wear-resistance of those materials depends on microstrength. The higher microstrength is, the lower wear-resistance of materials is. Such dependence was revealed in the course of studying the process of microcutting by single abrasive grains, as well as evaluating specific capacity of abrasive tools in operation. Thus, the microstrength parameter can be used to forecast operational efficiency of materials and tools.
Simulation of upsetting process using kinematic schemes of metal flow
Authors: Solomonov K N , Tishchuk L I , Lezhnev S N , Listrov E A 
Published: December 2020

Abstract
The problems of simulation the on the basis of kinematic schemes of metal flow, which is observed in the processes of forging and stamping workpieces with flat areas, are considered. Presented traditional kinematic schemes of metal flow: normal and radial. To solve these problems, a modernized program complex EQUI was developed, which is used for computer simulation of metal flow in the workpiece plane. It is shown that for any parameters of upsetting process is a real «intermediate» kinematic scheme of metal flow, which consists of areas of the flow normal to the contour and areas of radial flow. The results of a virtual experiment were obtained using the program complex DEFORM, which has proven well in solving plastic forming problems. For computer simulation of the spatial diagram of contact stresses and the dividing line of metal flow is selected known software COMPAS. The horizontal projection of the solid model allows you to get an image of the dividing line of metal flow. Comparison of results, obtained in the COMPAS and EQUI, shows good agreement.
Development the assembly sequence mathematical modeling method of precision axisymmetric products based on the graph incidence matrix
Authors: Volkov I A , Primak D D , Artykh R L , Bazhenov R I 
Published: December 2020

Abstract
The paper presents a method for problem solving of automated construction the assembly sequence of high-precision axially symmetric products. The purpose of this article is testing the admissibility of using a directed assembly graph, including adjacency and incidence matrices, for structuring and planning theoretical schematization of the assembly technological process. The considered method coincides with a possible mathematical implementation of the problem. The specificity of the structure modeling and the assembly process using mathematical methods has been evaluated. The graph creating technique representing the relationship between parts and the assembly process is considered. The solving the problem of assembly process automated construction is performed using algorithms and computational software based on the graphs constructing of in the matrices form. A comparison of the results achieved theoretically and computer aided in terms of designing the assembly process has been made. The achieved results make it possible in real time to adjust the productassembly sequencing, on the basis of this, it becomes possible to track parameters and control decision-making when planning assembly processes.
Approach to optimization of composite aircraft wing structure
Authors: Aung Phyo Wai , Tatarnikov Oleg , Aung Naing Lin 
Published: December 2020

Abstract
This paper describes an approach to optimization of composite aircraft wing structure basing on multi-criterion method. Two types of composite wing structures such as two-spar and three-spar ones were considered. The optimal layout of a wing frame was determined by Pareto optimization method basing on three criteria: minimal wing deflection, maximal safety factor and minimal weight. Positions of internal wing frame parts (spars and ribs) were considered as optimization parameters. As a result, an optimal design of a composite spar-type wing was proposed.
The technology of printed circuit board microdrilling
Authors: Mikhailov V P , Aung Tun Lin , Kazakov A V , Kopylov A A 
Published: December 2020

Abstract
The paper describes the device and operating principle of a high-precision positioning drive based on a magnetorheological (MR) elastomer for micro-drilling blind holes in multilayer printed circuit boards. The results of experimental studies of a drive with a closed control system for step-by-step movement are presented. The operation of the drive in the mode of active vibration isolation is shown and the coefficient of transmission of the vibration displacement amplitude is determined.
Information technology of ultrasonic assembly and pressing of joints
Authors: Shuvaev Vyacheslav 
Published: December 2020

Abstract
The paper considers the issues of increasing the efficiency of forming press connections by using additional ultrasonic vibrations introduced during the pressing process. A distinctive feature of the proposed approach is the use of ultrasonic vibrations simultaneously both for technological purposes to improve the efficiency of Assembly of press connections, and for indirect non-selective diagnostics of formed connections by analyzing vibrations directly in the Assembly process. The developed algorithm and device for ultrasonic pressing of teeth of a roller bit with an assessment of the quality of pressing on diagnostic indicators is presented.
Studying the process of electric discharge machining of products obtained by powder laser welding
Authors: Shlykov E S , Ablyaz T R , Muratov K R , Sidhu S S 
Published: December 2020

Abstract
In modern mechanical engineering, machine parts and mechanisms are made of new materials. These materials are characterized by enhanced mechanical properties. Expensive are products made from them. Deterioration of working surfaces leads to the need to replace the entire part. About 80% of the part is not subject to wear. The method of laser surfacing allows you to restore the part. The operability of the mechanism is returned. Cost-effectiveness is increasing. The processing of deposited surfaces is difficult. The properties of mechanical surfacing increases and cutting with a blade tool is not possible. Electroerosive technologies are beginning to be actively used in the processing of deposited parts. The study of the electro discharge machining (EDM) process of such details is now relevant. After EDM, the formation of the roughness of deposited surfaces has not been fully studied. The aim of the work is an experimental study of the EDM process of such surfaces. It is important to study the effect of EDM modes on the formation of roughness is important. A full factorial experiment was conducted during the study. EcoCut wire-cutting EDM machine selected as experimental equipment. Brass wire d = 0.25 mm is used as an electrode tool. The deposited material titanium VT-01 is selected for the experiment. An empirical model was obtained during the experiment. To establish the relationship between the EDM modes and the quality of the processed surface allows the model. An increase in the stress (U, mm) and the height of the workpiece (N, mm) leads to an increase in the roughness of the treated surface (Ra, μm) when processing titanium was found. The maximum roughness value for Ra = 3.3 μm is achieved at a voltage of U = 25 V, duty cycle q = 3.5, and a workpiece height of 10 mm.
The energy-power parameters of the semi-enclosed heading of the rod-shaped hardware
Authors: Zhelezkov O S , Kharchenko M V , Martynov E M , Suvorova E V 
Published: December 2020

Abstract
The paper presents a mathematical model developed on the basis of the variational method and the calculations of the energy-power parameters of the semi-enclosed heading of the rod-shaped hardware. The results of the calculations are illustrated in the form of a chart, which can be used to determine the deformation forces in relation to the ratio of sizes of the bolt heads to be formed.
Effect of laser beam cutting parameters on productivity and dimensional accuracy of miniature spur gears of stainless steel
Authors: Anghel Cristina , Gupta Kapil , Jen TC 
Published: December 2020

Abstract
Product quality and process productivity are one of the major indicators to evaluate the performance of any manufacturing process. The quality of any product covers its appearance, geometric and dimensional accuracy, and surface finish and integrity that majorly include microstructure, micro-hardness type of parameters. Whereas, the productivity can be determined using material removal rate. Laser beam cutting is an important advanced machining process and has been scarcely explored for miniature gears. This paper reports, the effect of laser beam cutting parameters on one of the quality parameters i.e. dimensional deviation of miniature spur gears of stainless steel and material removal rate. Box Behnken design of experiments methodology has been adopted to conduct a total of twenty nine experiments where four important laser parameters i.e. power, cutting speed, focal position, and gas pressure have been varied at three levels each. The manufactured external spur gear of stainless steel consists of ten teeth, 0.750 module, 9.04 mm outside diameter, and 4.5 mm face width or thickness. The investigation found that cutting speed significantly affected material removal rate and laser power affected dimensional deviation. Individual effects of laser parameters on both material removal rate and dimensional deviation are discussed in detail in the chapter. The investigation identifies laser beam cutting as a viable substitute of conventional manufacturing processes for fabrication of quality miniature gears with high productivity.
On the question of improving the finishing operations of processing precise holes in the hulls of ship machinery
Authors: Shron Leonid , Bogutsky Vladimir 
Published: December 2020

Abstract
The profile of the cut surface is a combination of shape errors, undulations and surface roughness. Plastic deformation allows you to reduce the surface roughness without changing the shape and waviness errors achieved by boring. Combining the operations of fine boring and fine plastic deformation of the surface allows not only to improve the quality of the treated surface, but also under certain conditions provides the opportunity to simultaneously increase the processing performance. The best way to combine these operations in terms of productivity is when both the cutter and the deforming tool are located diametrically opposite in the same hole of the boring bar. Are proposed and described the engineering methods for calculating and selecting the geometry of the deforming tool, the feed and the strain force for combining technological operations of fine boring and fine plastic deformation of the wasted surface of the main holes of the ship’s hull mechanisms.
Selection of rational modes of laser powder cladding
Authors: Gots A N , Gusev D S , Lukhter A B , Zavitkov A V 
Published: December 2020

Abstract
A brief overview of the surfacing used on the working surfaces of industrial equipment parts is given. The most universal method of laser surfacing is considered laser powder cladding. The results of experimental studies on the choice of parameters of surfacing modes for a single track are presented: laser power, mass flow rate of powder for deposition, and surfacing speed. Samples made of 08H18N10T steel were used as a substrate for testing. Laser powder cladding was performed on a robotic complex with an ytterbium fiber laser and a coaxial powder feed. When measuring macrogeometry, the quality of a single track was evaluated by its geometric dimensions: height, width, and depth of the layer mixing of the surfaced and base materials (substrate). Variable parameters of the surfacing process were the output power of laser radiation, processing speed, and mass flow rate of the powder. The quality of a single clad track was evaluated by its geometric dimensions: height, width, and depth of the layer mixing of the surfaced and base materials (substrate). it is Shown that the value of d depends on the mass flow rate and the power of the laser radiation: when increasing mass flow rate, it is necessary to increase power of the laser radiation to ensure a constant value of depth of the layer mixing. The shape of the deposited clad track is close to a half-ellipse only when the laser power not more than 1000 W and mass flow rate 15 g/min. The height of depends on the value of mass flow rate and the laser power: when increasing mass flow rate, an increase in laser power is required in approximately the same ratio. The width of the surfacing with increasing mass flow rate at a constant power of laser radiation decreases due to the fact that the cooling rate of the liquid phase of the metal melt is very high and only superheated melt can increase the width of the clad track.