bluuebunny/crossref_metadata_2025 huggingface dataset:
Change Detection Based on IR-MAD Model for GF-5 Remote Sensing Imagery
Authors: Xu Guibin , Li Huafeng , Zang Yuwei , Xie Lianke , Bai Chunxiao
Published: March 2020

GF-5 is the domestic full spectrum satellite with the most spectral bands, and it can comprehensive observe earth and atmosphere, the data can effectively monitor the changes of ground objects. However, due to the high wave dimension and large data of the hyperspectral remote sensing image, which reduces the processing and operation speed, and brings great uncertainty to the accuracy. In order to improve the accuracy and processing speed of hyperspectral imagery change detection, a method of iterative weighted multivariate change detection based on IR-MAD is proposed. In this paper, the high-resolution remote sensing image of GF-5 is used as the data source. After geometric correction, removal of bad line and other pre-processing methods, the change detection results are obtained by the iterative weighted multivariate (IR-MAD) change detection method. The experiments show that: the algorithm in this paper is compared with change vector analysis (CVA) change detection, principal component change vector analysis (PCA-CVA) change detection method, and iterative weighted multivariate (IR-MAD) detection method without principal component extraction. The detection accuracy of this method is high, and the error rate and missed rate are also low.
Hierarchical neural network for facial attribute transfer
Authors: Guo You , Shang Yanlei , Zhang Xiaofang
Published: March 2020

The facial attribute transfer refers to generating a face image with desired attributes while preserving other details. In the existing methods, some of the them consider the independence among attributes but neglect the integrity. It may result in information loss and lead to distorted generation. The others ensure the integrity at the cost of insufficient independence limits. The generated images will be partially blurred. In this paper, GAN and Variational Autoencoders (VAE) structure are incorporated to preserve the details while attribute transfer occurs. The concept of hierarchical latent representation is introduced to realize the attribute independence. These methods work with each other forming an effective network for facial attribute transfer, referred as Hi-GAN. Experiments on the CelebA dataset show that our model can output clearer and more realistic images on facial attribute transfer.
ScaleLK: Registration of Point Clouds with Different Scales Using Deep Learning Methods
Authors: Xu Shuai , Shang Yanlei
Published: March 2020

3D point clouds are widely used in numerous research and applications, such as autonomous driving, industrial robots, and augmented reality, to represent the spatial structure of objects. The 3D point cloud registration aims to transform the source point cloud into the same coordinate system with the template point cloud, which is of great significance for the 3D reconstruction of the real world objects. ICP [1] is one of the most classic point cloud registration algorithms but it still has problems with efficiency and initialization. With the help of deep learning, PointNetLK [7] becomes a state-of-the-art point cloud registration method. Although PointNetLK is efficient and robust to some extent, it is not able to register point clouds with different scales. In this paper, we propose ScaleLK, an approach for registration of point clouds with different scales using deep learning methods. We have trained a feature extractor which supports scale feature and used this feature for registration of point clouds with different scales. We describe the architecture and compare its performance with other methods.
Text Classification for Marine Natural Products Literature
Authors: Dai Xuebing , Liu Wei , Gao Chunxiao , Wei Zhiqiang
Published: March 2020

We propose a text classification model MNPC-BERT for marine natural product literature based on BERT pre-training model. The marking task of Masked LM performed at the input stage of the pre-training phase is moved to the encoder of the transformer, which solves the problem of inconsistency between the pre-training phase and the fine-tuning phase. We have constructed a data set from a number of literature data sources containing different types of marine natural products literature, as well as a variety of different types of non-marine natural products literature. Compared with the classical algorithm, the algorithm proposed in this paper can better complete the classification based on existing data set.
Diabetes Prediction Based on XGBoost Algorithm
Authors: Li Mingqi , Fu Xiaoyang , Li Dongdong
Published: March 2020

Exploring important features of diabetes through analytical methods of data mining is able to predict and prevent diabetes. This paper proposes a diabetes prediction algorithm based on XGBoost algorithm with the numerical features being separated while some important features are extracted from the text features of experiment data. Experiment results show that accuracy of diabetes prediction based the improved XGBoost algorithm with features combination is 80.2%, which is feasible and effective method for diabetes prediction.
Research on Fault Diagnosis Method of Gearbox Based on FPGA and LabVIEW
Authors: Chen Zhuo , Yang Xiufang , Cheng Xiaolong
Published: March 2020

Gearbox is an important part of mechanical equipment. Its running state directly affects the working performance of the whole machine. Therefore, it is of great practical value in the research on gearbox fault diagnosis method. A gearbox fault diagnosis system based on FPGA and LabVIEW is designed in this paper, which consists of upper computer and lower computer. The lower computer uses FPGA as the core device to sample, convert, store and transmit signals, while the upper computer takes LabVIEW as the development environment to complete the signal processing and interface design of the fault diagnosis system. The experimental results show that the system is convenient for operating and user interface friendly. It can realize the real-time acquisition and transmission of the vibration signal of the gearbox, and the display and analysis of the vibration signal of the gearbox.
ESR temperature compensation algorithm based on BP neural network
Authors: Liu Li , Chen Xiaohui , Wu Yuqing
Published: March 2020

Erythrocyte sedimentation rate (ESR) is an important medical test parameter, changes in ESR value can reflect changes in the condition,ESR measurements are susceptible to ambient temperature.This paper proposes a temperature compensation algorithm for ESR measurement based on BP neural network,temperature compensation can be ESR value detection result,to further improve the measurement accuracy erythrocyte sedimentation rate.Firstly, a neural network model of ESR temperature compensation is established. Secondly, learning training samples of the network are obtained and the sample data is pre-processed and network trained. Finally, the network prediction effect is tested to generate an optimal ESR temperature compensation network model.The algorithm proposed in this article can use the neural network method to correct the erythrocyte sedimentation measurement value, and can quickly and accurately achieve temperature compensation of the erythrocyte sedimentation value. This algorithm not only makes the accuracy of the compensation link within the measurement tolerance range, but also for the temperature without training Points have predictive compensation effects.
Simulation and analysis of pedestrians in the station of urban rail transit
Authors: Liu Xia , Li Yazhuo
Published: March 2020

The hall of Wuhan Dazhi road station of urban rail transit is modelled by Anylogic. Based on the data surveyed in the morning peak period of some workday, walking paths of pedestrians are simulated and utilization of equipments is analyzed. To reduce pedestrian waiting time, security checkpoints are added. Then the average passage time going through the station hall is reduced.
Automatic feed formulation method based on Differential Evolution algorithm for precision feeding of dairy cows
Authors: Guo Peng , Zhang Longhao
Published: March 2020

To improve the efficiency of feed utilization and reduce the feeding cost, we proposed a feed formulation method based on Differential Evolution algorithm. Individuals were constructed according to the content of each raw material in the feed formulation and the lowest feed formulation cost was taken as the objective. The feed formulation was solved by Differential Evolution algorithm. Using NRC (2001) prediction model of main nutrient requirement of dairy cows and the data of common feed of dairy cows in China Feed Database, we carried out the experiment of feed formulation for lactating dairy cows. Compared the feed formulation result of our method with those of Linear Programming method, our method performed better.
Research on the realization and optimization of FFTs in ARMv8 platform
Authors: Du Qi , Huang Hui
Published: March 2020

Fast Fourier transform (FFT) is a basic algorithm in digital signal processing and has been widely used in engineering, science and mathematical calculation. With the wide application of ARMv8 processor, it is more and more important to study FFT algorithm to realize high performance on ARMv8 platform. In the current open source FFT library, FFTW packages are mainly suitable for ARMv8 platform, while FFTW and FFTs packages are mainly suitable for ARMv7 platform. This paper implements and optimizes FFTs software package on ARMv8 platform, making it suitable for ARMv8 processor. The experimental results show that the performance of FFTs is improved by about 18% compared with FFTW in ARMv8 platform.
The Modeling Method of Digital Twin Models for Machining Parts
Authors: Zou Qi , Hou Zhixia , Wang Mingyang , Jiang Shan
Published: March 2020

This paper introduces digital twin models for machining parts based on key features and gives the modeling method. In this paper we propose three layers structure of the digital twin model, including geometric layer, data layer and document layer, in order to make machining process optimization and quality prediction. The digital twin model realizes the expression of physical parts in digital space and the information correlation with theoretical processing features. Besides, this paper also analyzes the potential application scenarios and development trends of digital twin models of machined parts.
Recently Progress on Polylactide/Nanocellulose Nanocomposites
Authors: Xu Zhuoyuan
Published: March 2020

The development of renewable resources is a trend in the future. Polylactide (PLA), as one member of bio-polymers, has obtained a widely focus in industry and academy because of its renewability, biodegradability, biocompatibility and good thermomechanical properties. PLA is used in a wide variety of applications such as biomedical, food packaging, electrical and electronic equipment, and the automotive industry. However, PLA still has some shortcomings, such as lower heat distortion temperature, slower crystallization rate, lower thermal resistance, etc. These shortcomings also limit the further widespread use of PLA. One effective method to expand and improve these properties of PLA is adding nanofillers. This review summarizes and describes the role of nanocellulose as a filler in the modification of PLA matrix and some of the problems faced.
Machining Quality Evaluation and Optimization of Aircraft Structural Parts Based on Multi-factor Analysis of Variance
Authors: Xie Bukun , Wang Wenli
Published: March 2020

Quantitative evaluation of machining quality of aircraft structural parts plays an important role in improving machining quality of parts. The rate of error limit (REL) is proposed as a new evaluation index of the machining quality, which realizes quantitative evaluation of machining quality and is applied to optimization of machining quality. Aiming at the disordering of the measurement data and lack of effective analysis in actual production of engineering, a Machining Quality Evaluation and Optimization software (MQEO) is designed and developed with REL as the evaluation index. And the multi-factor analysis of variance is used to find out the main factor influencing the machining quality, and propose optimization suggestions.
Effect of double quenching process and tempering temperature on the microstructure and mechanical properties of a High Strength Low Alloy Steel
Authors: Zhu Fei , Luo Xiaobing , Chai Feng , Yang Caifu , Zhang Zhengyan
Published: March 2020

Effect of double quenching process and tempering temperature on the microstructure and mechanical properties of a High Strength Low Alloy Steel was investigated by OM, SEM, TEM methods and so on. The results demonstrated that double quenching process could refine prior austenite grains (PAG) effectively and the average diameter of PAG was refined by 5.4μm compared with single quenching process. Yield strength and tensile strength of double quenching and tempered specimens (QQT) and single quenching and tempering specimens (QT) exhibited similar variation trend with tempering temperature. Yield strength increased monotonously with increasing tempering temperatures. However, tensile strength descended at first and then recovered with rising tempering temperature. QQT specimens displayed greatly improved impact absorbing energy at -80°C but a little improved yield strength compared with QT specimens owing to the refined microstructure caused by double quenching process. Considerable austenite formed during holding process of tempering (670°C) in which elements of nickel, manganese and copper aggregated. And some of the aforementioned austenite transformed to hard phases (secondary Martensite and M-A islands) and some are retained as islands of austenite after water cooling. The presence of hard phases is the main reason for recovering tensile strength and deteriorating impact absorbing energy at -80°C.
Experimental study on dielectric properties of SiC material and temperature distribution of rubber materials containing silicon carbide coated metal via microwave heating
Authors: Li Qingling , Ye Ruzhou , Jin Ruizhu , Chen Hailong , Xia Guangzhen , Li Tao
Published: March 2020

Microwave heating has not been widely used in the heating process of the rubber products containing metal skeleton, because the metal reflects microwaves that leads to a large amount of heat in the metal-rubber contact surface due to the skin effect and the eddy current effect in the microwave field. This experiment investigated the effects of microwave frequency and temperature on the dielectric parameters of silicon carbide coating materials. The microwave heating process of rubber composites containing metal skeleton coate d with SiC mixture was also investigated experimentally. The results are as follows: As the microwave frequency increases, the dielectric parameters of the SiC coating material increase slowly first, when the frequency reaches a certain point, the dielectric parameters increase sharply to a maximum after that fall rapidly; Based on microwave frequency of 2450MHz, the dielectric constants of three different compositions of SiC coating materials decrease with increasing temperature; The temperature of the rubber composite containing the steel wire coated with the SiC is lower than the rubber composite containing the steel wire naked. The larger the content of SiC, the more uniform the temperature distribution, and the more effective the weakening of the sparks phenomenon caused by the skin effect.
Viscosity and rheological behavior of aqueous nanofluids containing TiO2 nanoparticles
Authors: Kong Linghui , Li Guixun , Yang Yong , Zheng Jun
Published: March 2020

Nanofluids containing different concentration of TiO2 nanoparticles were prepared. Their rheological behavior was investigated on LVDV III ultra-programmable Brookfield viscometer at different temperature and particles loading. Results show that rheological behavior of nanofluids is determinated by the concentration of TiO2 in base fluid, nanofluids shows good Newton behavior when nanoparticles loading is low, while shear thinning becomes evident when the volume fraction of particles was continuously increased. Besides, viscosity of nanofluids shows strong nanoparticles loading and temperature dependence, but quite differs from classical viscosity model, as the theory models severely underestimate the value of viscosity, which is attributed to electroviscous effect of nanoparticles in base fluids. The primary electroviscous coefficient is evaluated at different pH values. Modified primary electroviscous coefficient is in good agreement with Booth’s theory.
The promotional effect of sodium chloride on thermophysical properties of nitrate
Authors: Wang Chenge , Li Yan , You Gouyou , Zhu Qunzhi
Published: March 2020

Nitrate are the excellent phase change materials (PCMs) for thermal energy storage. Nitrate has no phase separation during phase transition and has good chemical stability. The present study concentrates on improving the latent heat of phase change and of heat absorption rate by adding various proportions NaCl into the nitrate/mixed nitrate. Sodium nitrate and sodium chloride were selected to prepare binary mixture by static melting method. The melting point and latent heat of phase change were measured by differential scanning calorimetry (DSC). Compared with pure sodium nitrate, the melting point and solidification point of binary molten salt containing 5% NaCl are reduced by 9°Cand 16°C, respectively. On the other hand, the latent heat of melting and solidification increased by 12J/g and 10J/g, respectively.
Synthesize of NiMoO4/Reduced Graphene Oxide Composite as High Capacity Anode Material for Lithium Ion Batteries
Authors: Li Lin , Cheng Jinsong , Liu Qing , Wang Ting , Zhao Rongfei
Published: March 2020

NiMoO4/Reduced graphene oxide (NiMoO4/rGO) composites material was prepared by a hydrothermal method. When used as a anode material for lithium-ion batteries, the NiMoO4/rGO composites show superior rate capability and excellent cycling stability. A reversible capacity of approximately 808 mAh g–1 is retained even after 100 cycles at 100 mA g–1. It is believed that the surface modification by graphene nanosheets contribute to the improved kinetics of lithium-ion diffusion, excellent structural stability and superior electrochemical performance.
Design of Control System for 6-DOF Manipulator
Authors: Li Xianglong , Quan Zikun , Liu Dongping
Published: March 2020

The manipulator is a complex system with high precision, high nonlinearity and strong coupling, the design of the manipulator control system has an important influence on the stable operation of the manipulator. The structural design, drive design and hardware design of the manipulator are the key contents of the manipulator, which needs to be coordinated and controlled as a whole. Through the establishment of a six-degree-of-freedom manipulator dynamics model, and the design of the manipulator control system is conducted in this paper.
Study on the Synthesis and Photothermal Conversion Property of Polyaniline
Authors: Bao Lihong , Liu Xin
Published: March 2020

A series of polyaniline (PANI) with different HCl/aniline and DBSA/aniline molar ratio was synthesized in this paper. The structure of PANI was characterized using IR spectroscopy. The effect of pH, thermal stability and photothermal conversion properties of PANI were investigated. The results showed that the IR spectrum presented typical absorption peaks of PANI-ES. The pH had a big influence on the optical property of PANI. The PANI had high thermal stability in all HCl/aniline molar ratio. The molar ration of DBSA/aniline can influence the photothermal conversion of PANI, whereas the doped PANI showed better photo thermal conversion efficiency than that of dedoped PANI.
Structural Design of Tool Head of Pipe Dredging Device
Authors: Jia Yufei , Shang Mengyu , Sun Haojun , Pang Chuang , Liu Junjie , Yang Xu
Published: March 2020

In the cold season, pipelines are prone to icing-induced clogging, causing great inconvenience to people’s production and life. To solve the icing-induced clogging of the pipeline, analysis was made on the reason why the original device fails to break the ice, to provide some guidance for conducting an innovative design of the cutter head of the device. Based on the actual needs for the cutter heads in the course of ice-breaking, a parallel inclined spherical rotary cutter head was proposed, and its 3D model created with the help of a modelling software. Through the operational and arc-traversing performance analyses of the cutter head, the relationship between the radial direction and the axial direction of the cutter head was constructed. The pressure relationship of the device was analysed. The conclusion was drawn as follows: the designed cutter head can improve the effectiveness of the device on ice-breaking and reduce the requirement for the structural intensity, providing a significant basis for the development of its physical prototype.
Deflection Calculation of Steel-Concrete Composite Beams Considering Effects of Shear Lag and Slip
Authors: Hu Di , Wang Yafei , Ding Faxing
Published: March 2020

Based on the proposed longitudinal deformation equation considering the slip between steel and concrete and the shear lag, the energy variation function is deduced, then the formula to calculate the deflection of steel-concrete composite beams considering the effects of shear lag and slip under the action of uniformly distributed load is derived. A group of experimental steel-concrete composite beams with different space of stud is made and the experimental data are compared with theoretical values showing that the formula holds high calculation accuracy.
Effect of aging treatment on corrosion resistance of Inconel 718 fabricated by selective laser melting
Authors: Liu Xuenan , Zhang Runyu , Feng Sengnan , Li Huixiang , Wang Yizhe , Gong Jianhong , Sun Hui
Published: March 2020

The microstructure and corrosion resistance of Inconel 718 alloy made by selective laser melting (SLM) by aging heat treatment (AT) were studied. After the solution treatment at 1050°C, the aging treatment temperature ranges from 600°C to 800°C. Scanning electron microscopy showed that γ” was precipitated out of the γ austenite matrix, with σ decrease in delta phase. The morphology, distribution and formation mechanism of precipitates in these microstructures were analyzed and discussed. Open circuit voltage curve (OCPT), alternating current impedance spectrum (IMP) and TAFEL curve (TAFEL) were tested by electrochemical workstation. Electrochemical corrosion results and corrosion resistance of samples after four different heat treatments were analyzed, and the best aging heat treatment mode and multistage aging treatment were discussed.
Structural Optimization of Machine Tool Column Based on Dynamic Characteristic Analysis and Response Surface
Authors: Bao Zhongfu , Zeng Dejiang , Wu Darao
Published: March 2020

Based on digital simulation technology, the dynamic characteristics of a NC machine tool column are studied, including modal analysis and harmonic response analysis. Then the response surface of design parameters and indicators is obtained based on the experimental design. Finally, the optimal design is obtained by using genetic algorithm based on response surface.
Effect of MWCNTs’ Content on the Properties of Polyimide Composite Molding Materials
Authors: Chen Xiaoqi , Wang Zhengzheng , Xu Haoran , Zhou Haijun , Zhou Mengmeng , Li Yantao
Published: March 2020

A series of MWCNTs/PI composite molding powders with different MWCNTs contents were prepared by ultrasonic dispersion in situ polymerization and blending method, and the samples were prepared by molding. In this experiment, 3, 3’, 4, 4’ - biphenyltetracarboxylic dianhydride (BPDA), pyromellitic dianhydride (PMDA) and 4, 4’ - diaminodiphenyl ether (ODA) are taken as the main raw materials and MWCNTs as reinforcement materials. The molecular structure, thermal stability, mechanical properties, wear resistance and hardness of the composites were characterized. Results showed that mechanical properties of the composite molding materials prepared by ultrasonic dispersion in situ polymerization are better than those prepared by dry mixing method. The composite molding materials showed the best properties at the MWCNTs content of 0.5wt%. What’s more, the tensile strength and elongation at break are 108.9MPa and 4.5%, which are 26% and 23.6% higher than those of pure PI.
Hot-pack Accumulative Roll-bonding (HP-ARB) Process of Ti-44Al-5Nb-1Mo-(V, B) Alloys
Authors: Li Tianrui , Liu Guohuai , Guo Ruiqi , Wang Xiuqi , Wang Zhaodong
Published: March 2020

Ti-44Al-5Nb-1Mo-(V, B) alloy preforms were processed under hot-pack accumulative roll-bonding (HP-ARB) process directly from HIPed ingot. A thin crack-free HP-ARB sheet was obtained. The corresponding microstructure evolution, alloy element distribution, and tensile properties were systematically studied. The alloy matrix were measured as ∼703-844 μm, while the defect-free bonding interfaces were measured as ∼96 and 221 μm. Near-lamellae and fine near-duplex microstructure were characterized in the bonding interface and the sheet matrix, respectively. The differences of stress state between the alloy matrix and the plate edge, and large deformation strain during HP-ARB are considered to be the main factors to form the microstructure characteristics. After HP-ARB, the sheet exhibited high performance at room-temperature (RT) as well as high-temperature. Ultimate tensile stress (UTS) of 863 Mpa and ductility of 1.71% were exhibited at RT. The 800 oC and 850 oC UTS/ductility were 754 Mpa/7.24% and 599 Mpa/67.5%, respectively. The pure bonding interface and fine homogeneous microstructure contributed positively to the RT and high-temperature tensile properties.
Size Effect of Ultra Pure Ti Thin Strip under Asymmetrical Rolling
Authors: Song Meng , Yin Libo , Bai Fengmei , Huang Zhenyi , Liu Xianghua
Published: March 2020

In order to study the size effect on properties of ultra pure Ti tensile tests were performed with ultra pure Ti foil (thickness range from 30μm to 280μm) by asymmetrical rolling. A pronounced size effect was observed at thickness of 34μm. The results were shown that the ultimate strength were increased as sample thickness down from 280μm to 34μm, however, were decreased as the thickness from 34μm to 30μm with ultrahigh strain. These features seemed to be link to the increasing of fraction of surface grain to volume, which led to the less districting on dislocation slip.
Parameter Simulation and Analysis of Rotary Feeder
Authors: Dong Fang , Li Yong
Published: March 2020

As a kind of continuous conveying equipment for powder and pellets, rotary feeder is widely used in the processing of non-staple food products, chemical industry production, metal smelting, wine brewing and terminal transportation because of its convenient control, high reliability and stable transportation. Such industries have an important position in the bulk material conveying industry. Different process parameters and structural parameters of the rotary feeder will have an impact on the conveying effect. The process parameters affecting the conveying effect mainly include rotor speed and material filling coefficient. In this paper, the dismantling rotary feeder with the rotor diameter of Ф62 is studied by simulation and test, and the influence of rotor speed and material filling coefficient on the conveying effect is analyzed.
Potential Transparent Supercapacitor Electrode Materials
Authors: Fan Ziyan
Published: March 2020

Supercapacitor utilizes the nano-scaled pores to increase the surface area indefinitely and shortens the distance between the positive and negative plate, on the account that some larger particles cannot fit into the pores. According to the capacitance equation “capacitance = εrε0 (area/distance),” as the distance decreasing and area increasing, the magnitude of the capacitance is tremendously magnified. A transparent supercapacitor describes a supercapacitor that has a high optical transmittance. If the intensity of light that transmits across the substance is higher than the rate that it is blocked or reflected. The substance possesses a transparency. The flexibility of transparent supercapacitors is another important area of studies. It generalizes a combination of stretchability, bendability, twistibility, or compressibility. In real life, it’s important to obtain the optimal optical transmittance, flexibility, and electrical conductivity for future devices such as smart glasses. These characteristics enable us to develop something more complex and advanced in the future.
Microstructure characterization and micro-hardness of Fe-9Cr ODS alloy produced by laser powder bed fusion
Authors: Shi Yingnan , Lu Zheng , Xie Rui
Published: March 2020

Oxide dispersion strengthened (ODS) alloys have been considered as the promising candidates for advance Generation-IV fission reactor application due to excellent radiation tolerance and high temperature mechanical properties but traditional manufacturing process is complex. A 9Cr-ODS alloy with nominal composition of Fe-9Cr-1.5W-0.3Ti-0.3Y2O3 (wt %) was produced by laser powder bed fusion (LPBF) which is a laser additive manufacturing technique. The microstructure and nanoscale oxide particles were characterized by using optical microscope (OM), electron backscattered diffraction (EBSD) and transmission electron microscopy (TEM). The micro-hardness was tested by hardness tester. The results showed that the equiaxed grains with an average size of 3.8 μm were obtained. The dispersed oxide particles with 10-20 nm were observed in LPBFed 9Cr-ODS alloy. The micro-hardness of built sample was about 460 HV.
Numerical Simulation Study on Bolted Joints of Steel-wood Structures
Authors: Zheng Yang , Xu Chunmei
Published: March 2020

As one of the most widely used rigid connections, bolted joints have the advantages of convenient loading and unloading, increased prestressing to prevent loosening, and no change in material composition at the joints. In this paper, six sets of test pieces are designed, and the monotonic loading is performed. The bearing capacity of the joints under the two parameters of bolt margin and wood characteristics is analyzed, and compared with the theoretical value, the reliability of the finite element simulation results is increased.
Selection of optimal vibration parameters molding reinforced concrete products
Authors: Vasiliev V G
Published: March 2020

The efficiency of reinforced concrete products vibration moldingdepends largely on the rational modes of vibration on the compacted concrete mix and the selected parameters of the equipment used. The article summarizes the results of experimental studies on the compaction of concrete mixes in molds that are freely installed on the vibration platform through elastic pads. It is shown that the forming concrete products in non-fixed mold provides for effective compaction by selecting the parameters of the oscillating system “vibrating table - elastic element - a mold with concrete mix”.The obtained results open a new prospect in the development and improvement of vibration moldingmachines with free set molds.
Organization of recycling of construction scrap with the use of mobile crushing plants in Russia
Authors: Gustov D Yu
Published: March 2020

The issues of recycling construction scrap during the demolition of buildings, taking into account the specifics of the work on the demolition of buildings in Russia. The feasibility of the formation of “distribution cards” demolished buildings with an indication of the type and predicted amount of construction scrap. A typical extended set of construction and road machines has been proposed, which should be used when using mobile crushers. Suggestions are given on the mechanism for forming a set of machines according to the criterion of specific reduced costs. The calculated dependencies are given. It indicates which machines should be considered when choosing a kit, and which machines can be excluded from the analysis.
Assessment of resources of road machines working in the conditions of tropical climate
Authors: Zorin Vladimir , Tuan Le Tchong
Published: March 2020

In this article results of researches are considered, formulas full gamma percent resource T

f.γ
and a gamma percent resource before the first major repair ofT

r.γ
(is developed for definition at γ=80%) road-building machines, according to technical condition and operating conditions of the machine in the tropical climate of Vietnam. The corresponding values of resources of road-building machines in Vietnam were at the same time defined that formed a basis for exact planning terms of carrying out construction works, to make the reasonable diagram of maintenance and repair of machines for each climatic zone of Vietnam.
Ultimate loads, arising on the blade during exploitation, according to existed design positions for calculations
Authors: Saveliev A G , Mikhailovskaya V A
Published: March 2020

In the paper a method for determining external loads on the working equipment of the bulldozeris presented. Using this method, it was revealed that the computations using the existing algorithm allow to obtain overestimated values of the loads, whatleads to a significant increase in the metal intensity of the machine design. Also in the article is shownaway for carrying outan experiment on the bulldozer stand, described the positions of bulldozer working equipment, according to which it will be tested and made the conclusions about the research.
Influence of the tilt of the sprung elements of the construction of car cranes on cargo stability
Authors: Mekhonin O N , Shchetkin R V , Pugin K G
Published: March 2020

This article describes the key features of determining the coefficient of cargo stability of automotive cranes on the base chassis, taking into account the roll of sprung structural elements. The possible factors affecting the error of the cargo stability calculation are identified, and the ways of solving this problem are proposed.
Evaluation of savings on operational services from innovative energy-saving materials
Authors: Romanova A I , Berval A V , Burkeev D O , Safina R S , Ilyina E V , Egorov D A
Published: March 2020

Innovative infrastructure projects, as a rule, are aimed at creating or some modification of infrastructure objects, which are characterized by large-scale, high degree of capital intensity, their long-term implementation, freezing investments for a long period due to a long payback period. The most fertile post for the implementation of infrastructure projects is construction.A high share of the economic effect is explained by the fact that the modern world is focused on increasing the efficiency of each innovation, thereby saving on the costs of natural resources, which affects environmental stabilization and the rational use of the resources received. In this aspect, investments in green building can be considered particularly advantageous, allowing us to talk about the double effect of innovations in construction: here we can also reduce the environmental burden on nature with the help of new technological solutions at the stage of development and application of new environmentally friendly materials (effect for the manufacturer), and comfort for a consumer of highly environmentally friendly construction products in an environmentally friendly area (effect for the buyer) in a large metropolis.
Optimizing the location for the enterprise recycling the forestry production waste
Authors: Tyurin N A , Gromskaya L Ya , Antonova T S , Kalyashov V A , Artemiev V N
Published: March 2020

The article discusses the optimization of the location of the enterprise for recycling the wood waste from logging and wood processing industries. A promising area of waste recycling is the production of wood-fuel pellets as an alternative renewable energy source. The raw material supply of pellet production means a lot of collection activities, in which transport costs play a decisive role. Sources of raw materials and consumers of finished products are distributed over vast territories. The paper proposes an integrated approach to solving the problems of the territorial location of the recycling plant based on logistic methods and the use of geographic information systems. The paper presents a mathematical model and a technique for optimizing the territorial distribution of pellet production by the criterion of the minimum transportation costs for raw materials. The developed methodology takes into account the existing infrastructure. It involves the full use of sources of raw materials, and also allows us to choose the best option for the location of the enterprise, taking into account the social and economic possibilities of construction. The technique has great versatility, which allows it to be used to place enterprises of various fields of activity. It clearly reflects the results of the problem solution, which simplifies the decision-making process on the location of enterprises.
Optimizing the number of anti-skid device for vehicle
Authors: Sakhapov R L , Makhmutov M M
Published: March 2020

We can image the shift work of the vehicle in the form of: a) the movement of the unit from the park to the object of work; b) work on the object; c) the movement from the object to the park. Depending on the condition of the roads, as well as the weather conditions of spring and autumn, the driving wheels of the vehicle can be equipped with the hooks just before leaving, on the road or directly at the work site. In any case, it is necessary to spend a certain amount of the shift time for installation and disassembly of the anti-skid device.
Open gear train as a source of oscillations of the construction machines mechanisms
Authors: Skel V I
Published: March 2020

The article considers kinematic, force and parametric characteristics of an open cylindrical gear train of the rotation mechanism of an excavator as sources of oscillations of mechanisms with a tooth frequency. The author builds a two-mass dynamic model with an internal perturbation in the form of a variable gear ratio and taking damping into account. The paper shows that the main perturbations can be the difference between the basic pitches of the gear and the wheel and the error of the involute profile of the side surface of the teeth. These errors occur during the manufacture of a gear pair and due to wear of the teeth. The errors in the relative position of the gear and wheel teeth, the variable tooth hardness with an overlap ratio greater than one, friction in the engagement for open gear train of a large module and manufactured by 8 … 9 degrees of accuracy, play a significantly smaller role in the excitation of oscillations. The effect of the considered sources of oscillations should be taken into account in the resonant modes of the mechanism operation.
Implementation of laboratory works on the modern laboratory equipment
Authors: Drozdov A N , Belkina E R
Published: March 2020

The Department “Mechanization of Construction” of Moscow State University of Civil Engineering continues to work in the implementation of the concept of development of educational disciplines in terms of the widespread use of computers and software in the educational process. This paper determines the main characteristics of two types of impact machines: electric hammers with vacuum magnetic angle valve and impact wrenches using NATIONAL INSTRUMENTS equipment and, in particular, the NATIONAL INSTRUMENTS ELVIS workstation.
Improving the level of traffic service on the road network of cities
Authors: Solodkiy A I , Chernikh N V
Published: March 2020

The problems associated with the formation of congestion and the low quality of transport service continue to be relevant for modern megacities. One of the parameters that evaluates the effectiveness of the organization of traffic, is the level of service traffic. The article provides foreign experience of using this parameter. The need to improve the level of traffic service on the road network by using a set of measures is noted as the main problem. The authors give a classification of event types. The paper notes that only the integrated application of the measures specified in the classification, taking into account the restrictions imposed and the existing traffic conditions, has the greatest effect.
Experimental studies of the dependence of the heterogeneity coefficient of the mixture on the technological parameters in the mixer with a variable working chamber
Authors: Lozovoi N M , Radinskaya L V , Lozovaya S Y
Published: March 2020

Mixing bulk materials is widespread in various industries: construction, agro-industrial complex, chemical technology, energy industry and many others. At the same time, the task of preparing homogeneous mixtures is associated with a number of difficulties, such as a wide range of changes in the physicomechanical properties of the processed materials, requirements for the quality and composition of the product, productivity, energy and metal consumption, etc.
On complex formation in chemical copper plating processes from solutions with organophosphorus ligands
Authors: Mukhametshina R M
Published: March 2020

Nowadays the processes of chemical vapor deposition of metals are widely used in mechanical engineering, both for the production of materials with desired functional properties and for decorative purposes. One of the most widely used chemical vapor deposition processes is chemical copper plating. The paper aims to study the complexation of copper (II) with nitrilotrimethylene phosphonic acid and to identify the possibility of using nitrilotrimethylene phosphonic acid as ligands of copper (II) ions for obtaining stable solutions of chemical copper plating. The formation of copper (II) complexes with nitrilotrimethylene phosphonic acid has been studied by the electron paramagnetic resonance (EPR) method. The paper proposes a method for processing EPR data – measurements to calculate the distribution of complex forms in the form of dependence = dP/dpH – f(pH), where P – the EPR spectrum parameter, which seems promising for describing paramagnetic systems characterized by complex equilibria with small changes in the magnetic parameters relative to the line width. The significance of the results for the engineering industry is that the authors studied the new materials based on copper complexes with nitrilotrimethylene phosphonic acid. The article establishes compositions and calculates the stability constants of the complexes at various pH of the medium. The research also shows the possibility of obtaining high-quality metal coatings based on copper (II) complexes with nitrilotrimethylene phosphonic acid.
Formation of a system for assessing the renovation of monolithic buildings
Authors: Topchiy D , Bolotova A
Published: March 2020

Reliability and quality of monolithic construction works are determined by analyzing the system of preparation for implementation of certain technological operations, establishing and ensuring the order, sequence and timetable of works, and supply of all types of resources. Periodic inspections of compliance with construction norms and regulations are held in the course of construction and installation works. As a follow-up on such inspections, prescriptive orders on rectification of detected nonconformities and violations within a specified time limit are issued. There is no provision for the time consumed by corrective action in the calendar plan, and consequently the actual duration of construction as often as not exceeds the scheduled term to a great extent. In this connection, there is a task of assessing the level of impact of violations on the efficiency of functioning and the organizational quality of production processes. Analytic research into this problem allows for a conclusion on the need for development of a mathematical model to be used in the assessment of duration of construction taking into account the random pattern of occurrence of violations.
Assessment of the impact of capital construction on the adjacent street-road network with traffic at unregulated intersections
Authors: Zedgenizov A V
Published: March 2020

The article discusses the problems of assessing the influence of centers of gravity on the adjacent street-road networks in the process of their functioning, expansion or reprofiling. The paper shows the main models for estimating the throughput of unregulated intersections proposed in the domestic and foreign literature. The author gives sequence of calculating the transport demand transforming into the intensity of the traffic flow on the road network. Moreover, the study proposes recommendations on assessing the level of traffic service and load factor based on transport demand and throughput, adjacent street-road network.
Ways to improve safety and environmental friendliness of the city’s transport system
Authors: Makarova I V , Gabsalikhova L M , Sadygova G R , Magdin K A
Published: March 2020

The transport sector is one of the largest environmental polluters and hydrocarbons consumers. The oil prices instability and the need to reduce the negative impact on the environment, cause countries to introduce alternative technologies. In the article, measures to reduce harmful substances emissions with vehicles exhaust gases are divided into three groups: constructive, organizational-technological, and organizational-managerial. The environmental friendliness of urban transport systems is ensured by an increase in the “green” vehicles share in the fleet. This electric transport: trams, trolley buses, electric buses, as well as vehicles with natural gas’ engine. Reducing air pollution, noise and vibration make electric vehicles more attractive and competitive, but we must bear in mind that the silent movement of electric vehicles and electric buses may pose a threat to the pedestrian’s safety. Road traffic accidents (RTA) worsen the situation, as they aggravate the difficult traffic situation, causing congestion, traffic jams, and, consequently, increase the negative impact. The study authors selected the intersection Avtozavodsky Avenue - Syuyumbike Avenue (Naberezhnye Chelny), as a RTA concentration place in 2015-2019. We investigated emissions and noise pollution by road transport. In the article, we proposed measures aimed at reducing emissions and noise.
Alternative power resources in the motor vehicles supply
Authors: Makarova I V , Gubacheva L A , Andreev S , Andreev A
Published: March 2020

The rapid development of engineering, technology and mass motorization during the transition to the fourth industrial revolution is accompanied by negative processes in ecosystems and leads to a change in the economic paradigm - to the circular economy. Reducing resource consumption while decreasing the growth of waste production and consumption will reduce the negative load on the environment. The search for global solutions to ensure comfortable living conditions on the planet is determined by minimizing the adverse environmental impact of solid industrial and household waste (MSW). The article presents a new technology of energy- and resource saving in automobile transport using MSW as an alternative fuel and exhaust gas cleaning filters for internal combustion engines, that will allow to reduce pollution by the slowly decomposing polyethylene of the world ocean, which is now becoming a global scale catastrophe.
Development of a model of the single information space of the enterprise supporting the replacement of layers
Authors: Shifrin B M , Eliseev I V , Sokolova V A , Kalyashov V A
Published: March 2020

The main purpose of this article is to substantiate and develop the methodology of replacement of generations of layers in an attempt to minimize destruction of links between adjacent layers of the single information space of the enterprise, caused by extreme instability of states of the single information space.