bluuebunny/crossref_metadata_2025_split huggingface dataset:
Structural Dynamics Simulation Analysis of Industrial Robot Arm Based on Kane Method
Authors: Luan Yizhong , Guo Junmei , Liu Haiying 
Published: April 2021

Abstract
When the traditional methods are used to analyze the dynamics of the robot arm structure, the stability of the arm structure is not good and the simulation effect of the operation process is not good. For this reason, Kane method is introduced in this paper to carry out dynamic simulation analysis of industrial robot arm structure. The operating process of the industrial robot arm structure was simulated by Kane method, and the angular acceleration of the robot’s main arm, forearm and push rod was solved in each cycle. The Jacobian matrix of the 5 degree of freedom manipulator joint is established, the singular configuration of each joint is calculated, and multiple joint variable combinations are generated by random number. The forward motion equation of the robot endpoint set was solved to obtain the endpoint set of the robot. The Lagrangian method was used to model the robot with Kane 3D simulation software to simulate and analyze the dynamic process of the driving torque required to grab the mass workpiece at the three joints. The joint motion model of robot is established on ADAMS simulation software, and the torque curve of the rotating joint of industrial robot arm structure is obtained. MATLAB simulation software is used for simulation. The results show that the integrated design method of manipulator and machine tool is correct, which provides a comprehensive data basis for the selection of servo motor.
Analysis for anodized film blackening of aluminum alloy components
Authors: Zou Xiaohui , Jiang Chengjun , Lv Chaojun , Sun Xiaojiao , Luo Jing , Chen Shumao 
Published: April 2021

Abstract
Sulfuric acid anodic oxidation is an important means to improve the corrosion resistance of aluminum alloy components. The blackening phenomenon of aluminum alloy components after sulfuric acid anodizing is analyzed by chemical composition test, mechanical property test, process parameters analysis, metallographic examination and other tests. The analysis results are compared with normal color components after anodized. The result shows that the unsufficient solid solution heat treatment is the main reason for anodized film blackening of the aluminum alloy components, which result in the abnormal microstructures. At last, the measure of secondary heat treatment is taken to solve this problem effectively.
Research on Feature Extraction of Local Binary Pattern of SLM Powder Bed Gray Image
Authors: Yin Yu , Liming  , Dali Guan 
Published: April 2021

Abstract
The quality of powder bed is one of the important factors that affect the quality of Selective Laser Melting(SLM) of parts. Image preprocessing method and defect identification method are proposed for recoater hopping during powder spreading by SLM. For the collected powder bed image, the Basic Mask method is designed to preprocess the image, uniform the light intensity distribution of the image and filter out the image noise. To extract the defect features accurately, different Local Binary Patterns (LBP) operators are used to classify and calculate the identification accuracy of each operator by Support Vector Machine (SVM). The recognition accuracy of this method is up to 98%.
Analysis of harmonic oscillator mass parameters influence on multiband gap widening for Drude model acoustic metamaterial
Authors: Shi Huijie , Gao Ming , Yin Song , Wu Shujiang 
Published: April 2021

Abstract
Acoustic metamaterial is a kind of special microstructure of man-made composite material with vibration attenuation band gap. In view of the band gap widening methods, the Drude model with additional double harmonic oscillators five periodic spring-mass system is established, and then the steady-state displacement and velocity of each oscillator under different external excitation frequencies were calculated, the vibration transmission characteristic of the system is obtained. The band gap widening method is analyzed. The results show that, compared with the Drude model, a new high frequency band gap is developed by adding double harmonic oscillators, and with the increase of the additional oscillator mass, the total bandwidth of low frequency band gap is widen. The research provides theoretical basis and application basis to the design of vibration isolation structure implement specific frequency band of noise reduction.
Comparative experimental study on phased array and X-ray detection of small diameter pipe weld
Authors: Xie Liming , Wang Tongle , Zhang Yanfei 
Published: April 2021

Abstract
According to the principle of ultrasonic phased array technology, the phased array inspection technology for butt weld of small-diameter pipe is developed. The ultrasonic phased array and ray inspection tests are carried out on the sample pipe of small-diameter tube with typical specification of heating surface in Inner Mongolia thermal power plant, and the evaluation results obtained by the two inspection methods are compared and analyzed. It can be seen from the comparison of testing results that ultrasonic phased array testing has more advantages than X-ray testing in defect detection rate and defect parameter measurement. At the same time, ultrasonic phased array testing also has the advantages of environmental protection, intuitiveness and high testing efficiency.
Effect of Rare Earth Yttrium on Thermodynamic Properties of 20MnSi Steel
Authors: Bai Zhiling , Qin Bingke 
Published: April 2021

Abstract
The Gibbs free energy of yttrium-containing compounds in 20MnSi steel is obtained by establishing a thermodynamic model and calculation. The results show that as the Y content increases, the oxygen content and sulfur content first decrease sharply and then slowly decrease; the Gibbs free energy of yttrium-containing compounds decreases as the content of rare earth yttrium increases; the Gibbs free energy of Y2O2S is the most negative and the Gibbs free energy of Y2O3 is the largest. It is concluded from the thermodynamic calculation results that rare earth yttrium can be desulfurized and deoxidized, and the desulfurization tendency of yttrium is greater than the deoxidation tendency; Y2O3 is unstable and can be transformed into Y2O2S.
Stained Glass in Lingnan Historic Buildings and Its Application in Manchuria Windows
Authors: Yan Lina , Chen Yile 
Published: April 2021

Abstract
Stained glass has been extensively applied in Lingnan historic buildings, especially unique stained art glass windows which will be usually used at doors and windows needing large-area lighting for the purpose of ventilation and lighting, and they are called Manchuria windows. First of all, under the historical application background of stained glass in the Lingnan area, this study discussed the types of stained glass and the technological development in Guangzhou. Secondly, the fabrication process of glass etchings was generalized. Next, the application laws of stained glass in Manchuria windows of Lingnan historic buildings were explored. Finally, the basic combination modes of stained glass applied in Manchuria windows were obtained. These laws and modes can not only provide a reference for the repair of Lingnan historic buildings but also constitute an enlightenment on the windowing form and artistic creation of modern buildings.
Preparation of carbon/silica composite aerogel and application of fire insulation
Authors: Fang Dehao , He Yan 
Published: April 2021

Abstract
In order to improve the disadvantages of aerogel brittleness and easy structural destruction during drying, carbon/silica dual network aerogel composites were constructed by copolymerizing carboxylated carbon nanotubes and tetraethyl orthosilicate decomposition products on chitosan templates. The composites were characterized by microscopic morphology and structural properties. The results show that the bulk carbon/silica aerogel composites can be prepared by freeze-drying through the reinforcement of chitosan templates and carbon nanotubes. The N2 adsorption and desorption curves of the composites show a type IV curve. The thermal conductivity of the material is only 0.0375 W/(m*K) at higher temperatures, which does not change much compared to that at room temperature (0.0312 W/(m*K)).
Experimental study on microstructure of overcurrent fault of copper conductor
Authors: Cai Zhouquan , Shi Lin 
Published: April 2021

Abstract
This study aims to more accurately identify the microstructure characteristics of copper wire when overcurrent fault occurs, and further improve the accuracy of electrical fire investigation. In this paper, the overcurrent fault of copper conductor under 4-7 times rated current is simulated. The difference of metallographic structure under different current is analyzed by metallographic microscope. Image-Pro-Plus software is used to measure grain perimeter, and the quantitative criterion and change rule of metallographic structure are studied. The experimental results show that with the increase of current, the diameter and area of the grains tend to increase. When Ie=128A, the grains are mainly slender dendritic and columnar, accompanied by a small amount of cellular crystal distribution. The grain directions are different, and the boundary between grains is large; when Ie=160A, the grains continue to grow, the number of dendritic crystals increases, and the grain boundary becomes fine; when Ie=192A, the grains are mainly columnar and cellular, with clear grain boundaries, obvious lattice and generally consistent grain directions; when Ie=224A, the dendritic grains decrease obviously, and the grain diameter and area have little change compared with 192A.
Modeling and simulation of the temperature field of selective laser sintering
Authors: He Qiyang , Ao Xiaohui , Xia Huanxiong , Liu Jianhua , Yang Chun , Ren Ce 
Published: April 2021

Abstract
Selective Laser Sintering (SLS) is a kind of powder-bed additive manufacturing technology, which can directly shape parts with complex geometry. The heat transfer process has an important influence on the forming quality of the SLS process. Computational methods are useful to study the heat transfer in the process since the temporal and spatial scale is extremely tiny. This paper presented a model, coupling the discrete element method and heat transfer equations, to calculate the powder-applying and heat-transfer phenomenon. Firstly, the discrete element method and the basic framework of the heat pipe model were introduced, and then the process of manufacturing a mini propeller blade by SLS was simulated.
Development of A High Stiffness Linear Compression Spring
Authors: Huang Jinfei , Zhang Hangbin , Lin Wanglin , Zhao Xinze 
Published: April 2021

Abstract
This paper summarizes the whole process of design, trial-manufacture, improvement and final design of the spring, which is the core part of the shock absorption device for the surface layer of synthetic materials in the standard GB 36246-2018 “Surface layer sports ground for primary and middle schools”. The successful development of this key part fills the blank of spring deformation parts in domestic testing industry, and can be used in other fields.
Optimization of Milling Cutting Parameters under Carbon Efficiency Target
Authors: Yin Ruixue , Wang Ze 
Published: April 2021

Abstract
In order to improve the energy efficiency of the CNC milling process and reduce the carbon emissions during the milling process, this paper presents a method for cutting parameters selection by considering both materials remove rate and carbon emissions. First, a metric called carbon emissions efficiency is proposed with consideration of the materials remove rate and carbon emissions. Second, the carbon emissions evaluation model for NC milling process is built based on the input-output flows. Third, an optimization model for the parameters used in a milling operation is built where the spindle speed and feed rate are taken into account as optimization variables. Constraints are proposed based on the machine tool performance parameters and the quality requirements of the workpiece. A genetic algorithm is employed to solve the optimization problem. A case is studied to validate the model.
Thermoelastic Damping in Fully Clamped Circular Plate Resonators Based on Nonlocal Thermoelasticity
Authors: Ge Xiao , Li Pu , Fang Yuming , Yang Longfei 
Published: April 2021

Abstract
Thermoelastic damping (TED) is the main source of energy dissipation in resonators. The modelling of TED is of great importance for the design of micro-electro-mechanical systems (MEMS) and the improvement of quality factor. Most of the previous TED models are based on classical continuum mechanics and Fourier heat conductive model. However, small-scale effects are widely found for structures at nano and sub-micron level and the classical theories cannot describe their size-dependent behaviors. Based on the nonlocal elasticity theory and the nonlocal heat conductive model, the thermoelastic coupled governing equations of a circular plate with out-of-plane vibration under the influence of nonlocal effect are derived in this paper. The influences of nonlocal thermoelasticity on TED in circular plates are discussed by numerical examples under different boundary conditions, frequencies, thicknesses and modes.
The Viscoelastic Fluid Flow in a Confusor
Authors: Kadyirov Aidar , Zaripov Rinat , Karaeva Julia , Vachagina Ekaterina 
Published: April 2021

Abstract
The planar flow of a viscoelastic fluid is studied in tapered channel (confusor) with different contraction rates (2:1, 4:1, 6:1). A polymer melt is considered as a specific liquid, rheological behaviour is described using the four mode Giesekus model. The effect of the contraction rate of a confusor on the axial velocity profiles and the components of normal and shear stresses is investigated. Approbation of numerical studies was carried out by means of the example of the planar flow of a viscoelastic fluid in a channel with abrupt contraction.
Retraction: Exploring the Response of Combined Urban Sewer System to the Implementation of Green Roof (IOP Conf. Ser.: Earth Environ. Sci.
178 012043)
Authors: Gao Yuqin , Wang Dongdong , Schmidt A , Tang Yun 
Published: April 2021

IOP Publishing Limited ("IOPP") is retracting this paper following an investigation which has confirmed this work has significant overlap with a thesis written by another person, without permission or acknowledgement to the original authors. IOP Publishing Limited request any citations to this article be redirected to the original work [1].

IOPP have made multiple attempts to contact the author but has not received a response. The author is encouraged to contact jpconf@ioppublishing.org

[1] Yun Tang 2012 Exploring the response of urban storm sewer system to the implementation of green roofs Master's Thesis University of Illinois at Urbana-Champaign, USA
Retraction published: 28 April 2021
Research on the Early Warning Threshold of Slope Displacement Rate
Authors: WuJiangpeng  , YuJunping  , ZhuLiqing  , Suyang  , ZhangChengke  
Published: April 2021

Abstract
Slope is affected by internal structure and external natural and human factors, and the evolution process is quite complicated, which makes it difficult to determine the early warning indicators of slope instability. In view of the complexity of slope deformation, this paper introduces similarity theory, collects and sorts out related engineering data and landslide data of slid slopes in the past, uses engineering analogy to propose a displacement rate warning threshold method, and verifies the effectiveness of this method with engineering examples.
Numerical analysis of dynamic characteristics of sludge-type slag landfill landslide
Authors: Lei Wang , Xiaoguang Cai , Ping Li , Yuna Qi 
Published: April 2021

Abstract
The Artificial landfill landslide in Guangming District, Shenzhen, which occurred on December 20, 2015, showed the same characteristics as mudflow after sliding, which had long sliding movement distance and large coverage area, and caused serious casualties and property losses. Therefore, research on the dynamic characteristics of artificial accumulation landslide is of great significance for landfill slope hazard assessment and prevention in urban construction. On the basis of detailed collection of landslide investigation data and field investigation, the motion of the landslide was simulated with the friction rheological model by the software DAN-W in this paper, in order to obtain the characteristic parameters of landslide movement. The results showed that, the maximum movement distance was 1,112 meters and a running time of 105s simulated by friction model. The maximum front velocity was 22.5m/s and occurred at a horizontal distance of 632 meters. The horizontal length of the accumulation mass was 580 meters and the average thickness was about 8.2m. The numerical simulation results are basically consistent with the field survey results. The simulation model and the motion characteristic parameters of the muck can be used as reference for the prevention and control design of slope of similar muck field.
Research on UAV Path Planning Algorithms
Authors: Wang Hao , Pan Weijun 
Published: April 2021

Abstract
UAVs have received extensive attention and research due to their superior mobility and flexibility, and they replace manned aircraft to perform tasks in some specific complex environments. In order to deal with the complex and changeable environment and various obstacles, it is necessary to use appropriate algorithms to plan the UAV path. This paper divides the existing UAV path planning algorithm research into three categories: traditional algorithm, intelligent algorithm and fusion algorithm. The basic principles, advantages and disadvantages of various algorithms are analyzed, and the future research and development are prospected based on the actual operation of UAV.
Urban planning and development of the area of Peschanye streets in Moscow: past, present and future
Authors: Maximova O I 
Published: April 2021

Abstract
The paper analyses basic approaches which should be implemented for transformation of urban environment to preserve urban heritage values. For case study was chosen Peschanye streets district (Moscow, Russia) as an integral element of the urban environment, as a historical and cultural, experimental city district and as a potentially emergency development site. The article discusses the heritage and cultural landscape-based approach for urban development where the conservation and development are potential partners, affects principles and processes and all together can create increased value for city and citizens.
Legal aspects of financing the development of a modern urban environment
Authors: Gorlova E N 
Published: April 2021

Abstract
The formation of a comfortable urban environment is one of the important challenges of public authorities and is implemented at the level of the constituent entities of the Russian Federation and municipalities. The development of modern cities poses many challenges for their administration, most of which are solved by state or municipal funding (co-funding). In the context of budget deficit at the regional and local levels, it is necessary to develop a methodology for the distribution of costs on improvement and other social needs.
Rivers, urban community and production of space
Authors: Rudoy R O , Zayets D A 
Published: April 2021

Abstract
The article studies the characteristics of a river in a city as a special type of an urban environment object, which defines a special type of spatiality. The access of the community to the production of city space through the production of river space is considered. The authors analyze whether the river can be a catalytic space for the urban community, which allows it to better cope with this role than other spaces do, and how the potential of rivers can be used in the production of urban space.
Resource management of political influence during crisis
Authors: Polosin A V , Chikharev I A 
Published: April 2021

Abstract
The article discusses approaches to crisis management based on the resources of political influence. The research is based on a dynamic model of resources of political influence, which includes the main resources of trust and competence, which, in turn, allow mobilizing and optimal distributing of material resources. The importance of resources of political influence in various aspects and at various stages of crisis management and anti-crisis communications has been demonstrated. On the basis of a systematic approach to the development of social systems, the features of the processes of substitution and compensation of resources in the conditions of crisis dynamics of the system are analyzed. Possibilities of concentration of power resources in crisis conditions are considered. The perspective of modern approaches to public management based on information, data and knowledge management and based on social intelligence is revealed.
The study was conducted on the material of individual nuclear cities during the first wave of the spread of the new coronavirus infection.
Functions of the capital city in the political and territorial structure of the state
Authors: Okunev I Y 
Published: April 2021

Abstract
The capital is one of the backbone institutions in the political and administrative structure of the state. This is not only the location of the central authorities, the center for managing political processes in the country, but also the most important political institution that forms, reproduces and transforms its statehood, primarily influencing the political-territorial structure, the system of relations between “center-regions” and the regional state policy. This understanding of the capital city raises the question of why does the political and administrative structure of the state involve the allocation of a capital city, i.e. in other words, the inevitable division of the country into the center and regions, the formation of potentially conflicting social groups: residents of the center and residents of the periphery? And another question arising is what functions does such a division perform and how does it affect the nature of political processes in the state as a whole?
Management of the metropolises in Europe. Concepts, planning and trends
Authors: Maximova O I 
Published: April 2021

Abstract
The paper analyses concepts, planning and trends in European spatial planning network on the example of Rome (Italy), Berlin-Brandenburg (Germany) and Kristiansand (Norway) in order to formulate basic model for managerial innovations and conceptual framework consisting of key managerial innovations and approaches for spatial development of the metropolises. The article discusses the integrated diversity concept, the role of local actors in spatial development, spatial approach and spatially oriented policies, initiatives in strategic spatial planning and in regional development, innovative creative forces and regional identity.
Digitalisation of tax administration in the context of the development of high-tech municipalities
Authors: Moshkova D M 
Published: April 2021

Abstract
The priority direction of the development of the modern Russian economy is its digitalization, which necessitates the introduction of high technologies and innovative products in various areas of management and production. It should be noted that the process of tax administration is distinguished by a high level of application of digital technologies for calculating and paying taxes. The article studies the advantages and disadvantages of using digital technologies in the process of tax administration, including their application by territorial tax authorities in the constituent entities of the Russian Federation and municipalities. The analysis of specific measures for the implementation of high technologies in the field of taxation (personal account of the taxpayer, ACS “VAT-2”, “My Tax”) was performed and the prospects for improving the quality and efficiency of tax administration in the Russian Federation at the regional and local levels were identified.