bluuebunny/crossref_metadata_2025_split huggingface dataset:
Experimental study of working performance and mechanical properties to rubber with limestone powder concrete
Authors: Zhao Z F , Zhang X Z , Li L F , Yang Y 
Published: June 2021

Abstract
The influence of limestone powder concrete on working performance and mechanical properties are researched under which it is changed substitution rate of rubber powder and mixing ratio of rubber powder with different fineness under equal substitution rate. Take C30 concrete as an example, two proportioning schemes are set respectively: The machine-made sand of limestone powder concrete is replaced by 20 mesh rubber powder equal volume; Under the specific constant volume rate of substitution, changing the mixing ratio of 20 and 40 mesh rubber powder to research working performance and mechanical properties of concrete. The results show that the substitution rate of 20 mesh rubber powder is less than 10%, increasing the slump of concrete. On the contrary, the slump of concrete decreases sharply and the flow performance weakens. The compressive strength of concrete decreases sharply when increasing substitution rate of 20 mesh rubber powder. When Increaseing the mix ratio of 20 and 40 mesh rubber powder under equal substitution rate, the slump of concrete increases and the compressive strength increases first and then decreases. Fixing the mixing ratio, the slump and compressive strength decrease with the increase of rubber powder substitution rate. When the mixing ratio of 20 and 40 mesh rubber powder is 2:1, the compressive strength of concrete is higher.
Comparative study of single and two way observation in precision leveling
Authors: Xu Yiteng 
Published: June 2021

Abstract
Precise leveling is an important part of engineering construction project. With the increasing requirements of engineering construction projects, the demand for smart leveling is also increasing, but in the actual survey operation, there are many shortcomings in precision leveling, which has a certain impact on engineering project construction and scientific research. Through the comparative analysis of one-way leveling and two-way round-trip leveling, it is found that there is still uncertainty in the replacement of two-way round-trip leveling by one-way leveling.
Research on UAV Oblique Photography Route Planning in the Investigation of Building Damage after the Earthquake
Authors: Cheng Xianzhou , Lin Jiasi , Zhao Xuezhi , Xiao Shuang 
Published: June 2021

Abstract
The post-earthquake building damage investigation is an important part of the earthquake emergency rescue work. It is a prerequisite for the ability to determine the location of the buried people and rescue the victims in the shortest time. Therefore, the timeliness of the post-earthquake building survey is a significant factor. The 3D reconstruction model of buildings based on UAV tilt photography has the advantages of multi-angle and three-dimensional, but it is too time-consuming. Therefore, this paper proposes a UAV tilt photography route planning algorithm. This algorithm improves the efficiency of the three-dimensional reconstruction of the building and saves valuable time for emergency rescue work. The algorithm requires two drone flights. During the first flight, the drone flies horizontally to get the aircraft POS data. With the POS data, the corresponding feature points on the ground will be obtained. According to the clustering of the feature points, the building oblique photography path planning area will be generated. Finally a reasonable drone route planning will be produced. During the second flight, the flight route generated by the algorithm was used to take oblique photography of the building to produce a three-dimensional reconstruction model. The final building model will be obtained based on the combination of the models obtained from the two flights. After contrast experiments with traditional oblique photography, the algorithm in this paper is significantly superior to the traditional oblique photography method in terms of building 3D reconstruction efficiency.
Underwater Signal Measurement and Transmission Experiment Equipment Design for LIDAR
Authors: Li Xianxing , Zhou Guoqing , Zhou Xiang , Lin Gangchao , Li Weihao , Deng Ronghua , Zhang Lieping 
Published: June 2021

Abstract
When carrying out related test experiments of shipborne LIDAR, it is necessary to launch lasers to areas with different water depths and confirm the working conditions of LIDAR according to the received waveform conditions, to debug the LIDAR. There is no special introduction to the indoor platform for this kind of testing. This article proposes an indoor LIDAR experiment platform, which will focus on the basic settings of the laser, sink, and reflector in the experiment, the design ideas and rationality of the sink and reflector modules, the experimental steps, and how to effectively obtain the waveform. This platform has good applications in parameter correction, waveform acquisition, water depth measurement, and other aspects of LIDAR design.
Study on numerical simulation method of overtopping dam break of concrete faced sand-gravel dam
Authors: Qiu Wen , Li Yanlong , Wen Lifeng , Bu Peng 
Published: June 2021

Abstract
Based on the field investigation of dam break cases, a numerical simulation method of concrete faced sand-gravel dam overtopping break is proposed. The method is mainly composed of three parts: (1) Aiming at the erosion and scour of vortex flow on dam body, appropriate model is used to simulate the flow movement; (2) The interaction between water flow and sand particles in dam break process is accurately simulated; (3) Based on moment balance method, the failure process of concrete face slab under dead weight and water load is determined. The results show that the proposed mathematical simulation method can accurately simulate the reverse erosion of the dam and the detailed evolution of the face slab break during the dam break process. The relative error between the measured data and the calculated peak breach flow, the development of the breach of the rockfill body, the duration of the dam break and the length of the face slabs are all less than 15%, which verifies the rationality of the numerical model.
Influence of community opening on road traffic
Authors: Zhang Haifei , Zou Du 
Published: June 2021

Abstract
The State Council of our country has put forward the idea of gradually opening up the completed residential quarters and unit compound, which has a different impact on the traffic of the roads around the residential quarters and a reasonable analysis of the index system, and then uses the analytic hierarchy process to study the impact of the opening of the residential quarters on the traffic of the surrounding roads.
Numerical Study on Soil Width in Quasi-Static Pushover Test of Soil-Underground Structure System
Authors: Han Runbo , Xu Chengshun , Du Xiuli , Zhang Zihong 
Published: June 2021

Abstract
Based on the test results of series quasi-static tests carried out by JSCE Committee, the rationality of the numerical model for quasi-static test of soil-underground structure system was verified. Then a quasi-static pushover test scheme was introduced, the verified numerical model was adopted to study the reasonable range of soil width in the quasi-static pushover test of soil-underground structure system. The results indicated that for this quasi-static pushover test scheme, when α (α is the ratio of the distance from boundary to the model structure to the model structure’s width) is 0.5 to 1.2, error of the seismic capacity of the key structural components obtained by the test method is relatively small.
Research on Key Technology of Integral Translation and Rotation of the Large-Diameter Shield and Steel Sleeve in the Underwater Tunnel of the Karnaphuli River, Bangladesh
Authors: Han Xiaoming , Zhu Jinpeng , Zhang Feilei , He Yuan , Zhong Han 
Published: June 2021

Abstract
The construction of the underwater tunnel of the Karnaphuli River in Bangladesh boasts the characteristics such as short time limit, small working shaft space and a large weight of the shield tunneling machine and etc.. Moreover, the translation and rotation of the shield tunneling machine are the key link of the entire construction, which also takes a longer time and is more difficult to achieve. The existing rotating technology of a shield tunneling machine and its applicable conditions were analyzed to conquer the difficulties like the tight time limit and the high mechanical level of disassembling and assembling of the shield tunneling machine in this project. The technology of integral translation and rotation of the large-diameter steel sleeve of the shield and the shield tunneling machine was proposed according to its characteristics and the present situation of confined working space. The technology mainly includes the design and application of the new steel ball base, the preparation of the working shaft space and its base, the leveling and translation of the shield tunneling machine, the translation of the shield machine, and its rotation at 180° in situ. The sliding friction between the sleeve base and the bottom plate of the working shaft is turned into rolling friction by the new steel ball base, which can effectively reduce the resistance of the translation and rotation of the steel sleeve. In a word, the working efficiency can be highly improved and the construction period can be shortened.
Analysis of remote sensing monitoring methods for construction land at home and abroad
Authors: Zhou Yang , Liu Nana , Yu Rongsheng 
Published: June 2021

Abstract
This article stars from the construction land remote sensing detection at home and abroad research situation analysis, summarizes various analysis methods, using spatial information technology in the process of urban construction land scale spatial distribution of different land use types and the spatial and temporal evolution of urban ecological environment quality evaluation, simulation, scientific development and management to provide decision support for the city, at the same time can also be used for land use planning, it provides reference for ecological and environmental governance. This can improve and enhance the level of urban planning and management, guide and control the future direction of urban development reasonably, so as to promote the coordinated development of cities.
Study of downscaling method for coarse-resolution soil moisture product using combined AIRSAR and PALS Radiometer data
Authors: Sun Yayong , Li Nan , Ma Jianwei , Huang Shifeng , Zhu He 
Published: June 2021

Abstract
As an important component of soil, soil moisture plays an important role in material and energy transmission between hydrosphere, biosphere and atmosphere. It is of great significance to accurately understand the spatial and temporal distribution of soil moisture in large areas. At present, the spaceborne passive microwave remote sensing could achieve the accurate surface soil moisture of large areas, but at the low spatial resolution (10-50km). Therefore, its application was restricted. In this paper, a downscaling algorithm of passive microwave soil moisture products based on C-band backscattering coefficient is developed, and the algorithm is verified by L-band PALS Radiometer data and C-band AIRSAR data, the correlation coefficient R between the soil moisture content and the measured value is 0.71, and the root mean square error is 0.053cm3 · cm−3. According to the verification results of measured data, the downscaling algorithm of soil moisture retrieval products based on C-band backscattering coefficient is reliable.
3D Scene Localization and Mapping Based on Omnidirectional SLAM
Authors: Ke Xilin , Huang Fei , Zhang Yi , Tu Zhiyong , Song Weiwei 
Published: June 2021

Abstract
The vision SLAM technology is the key technology of robot navigation and unmanned driving. In order to further study the accuracy of multi-view SLAM positioning and mapping applications, this paper combines omnidirectional imaging and SLAM technology, improves the existing technical model in the field of omnidirectional imaging, studies the pose map optimization and SLAM overall adjustment technology based on object constraints and global consistency, and carries out omnidirectional SLAM point cloud reconstruction and 3D mapping. Through the time synchronization experiment of Ladybug 5 Plus and Femtomes Mini2-D-INS, the two positioning results of the system and the GNSS measurement results are compared and analysed.
Visual analysis of research results of multi-source nighttime light data from the audit perspective
Authors: Cui Hongwu , Chen Li , Li Xinfeng 
Published: June 2021

Abstract
Based on the literature data of multi-source nighttime light research in the core database of Web of science from 2010 to 2020, combined bibliometric analysis and audit analysis, analysed by Cite Space software, the research results of multi-source nighttime light data are separately audited by integrated analysis, unit analysis, node correlation analysis and word frequency node classification. The main conclusions are: (1) After the initial and stable development of multi-source nighttime light data, it is in the rapid development period; (2) China and the United States are the main research countries (3) “City” is a research hotspot, and “China” is the main research object; (4) The research fields mainly focus on remote sensing, environmental science, imaging science and photographic technology, geography physical, and others.
Study on the Probability Model of Ship-Bridge Collision
Authors: Yu Guangnian , Gan Weidong 
Published: June 2021

Abstract
Based on the comprehensive analysis of the existing major ship collision probability models, this paper combined the advantages of the AASHTO model and the KUNZI model and improved AASHTO model by using the ship simulator to obtain the ship’s track probability distribution curve to replace the original geometric probability distribution curve. It also introduced ship stopping probability function to make up for the shortcomings of the AASHTO model in which the influence of human factors is not considered. Finally, this paper predicts the collision probability of the Longjiang Bridge in 2025 with the improved model.
Detection of grouting effect in defective areas of metro concealed tunnels in loess areas
Authors: Chen Qingrui , Zheng Xuanrong , Shang Xuexuan , Lv Gao , Yang Kang , Qi Jiahui , Xue Ruilei , Cheng Weikang 
Published: June 2021

Abstract
The occurrence of grouting defect areas in metro concealed excavation tunnels will lead to water seepage or deformation of the tunnels, which in turn will affect the metro operation and the safety of the buildings around the metro. In order to detect the effect of grouting in defective areas of concealed tunnel, this paper introduces the principle and characteristics of seismic scattering technology, and illustrates the application of this technology in detecting the effect of grouting in defective areas of concealed tunnel in Xi’an metro line 6 from Textile City to Textile Road with the application example of seismic scattering technology. The results show that: the grouting area shows high speed anomalies in the wave velocity image, and the defect area shows low speed anomalies, and the location and morphology of the grouting area and the defect area can be determined according to the distribution of high and low wave velocity anomalies in the wave velocity image. The technology also has the features of simple operation, large detection depth and high resolution, which is an effective tool for future urban metro construction and environmental impact detection and evaluation.
Formation of a nanostructured diamond-like phase from C48 clusters: Ab initio calculations
Authors: Greshnyakov V A , Belenkov E A 
Published: June 2021

Abstract
A new fullerene-like cluster C48 and a nanostructured cubic diamond-like phase formed from an ordered condensate of these clusters were theoretically investigated. Calculations of structures, properties and stability were performed using the density functional theory method. It was found that the new cluster should be stable under normal conditions. As a result of the hydrostatic compression of the C48 clusters, a high-strength semiconducting diamond-like phase, called CA7, can be obtained at 26.5 GPa. The CA7 phase can be unambiguously identified experimentally using a calculated powder X-ray diffraction pattern.
Calculation of the main parameters of the press extruder
Authors: Klasner G G , Kremyansky V F , Spiridonov A M 
Published: June 2021

Abstract
In this work the issues of extrusion of leguminous crops are considered, information on modeling of process processes of press-extruders is given, analysis of the modern market of press-extruders is carried out and patent search of existing inventions in the field of extradited production is performed. A press extruder for processing leguminous crops has been developed and detailed information about the developed press extruder is presented. The ratio of the extruder power to the number of revolutions per minute was calculated.
Gear tooth action in a plane synthesis based on the criterion of constant curvature
Authors: Timofeev G A , Barkova A A 
Published: June 2021

Abstract
The relevance of the problem of the gear tooth action in a plane synthesis based on the criterion of tooth profile wheel group curvature is justified. Based on a mathematical model of gear tooth action in a plane with a constant angular speed ratio, an algorithm for solving the problem with a given constant curvature is given. The obtained solutions allow us to perform an analysis of the general type of lantern gear in a plane.
Special automatic control system for the accuracy of processing axisymmetric workpieces
Authors: Drachev O I , Gorshkov B M , Samokhina N S 
Published: June 2021

Abstract
The article discusses a special automatic control system for the machining process as applied to metal turning lathe. In processing, generalized information about the precision parameters of the processing system is gathered that makes affordable to integrate four control loops into its system. The first control loop stabilizes the tool post body. The second control loop stabilizes the workpiece axis during cutting. The third control loop stabilizes the cutting edge and the fourth one stabilizes the tool-workpiece.
Changing properties of mechanically activated water suspensions
Authors: Rudnev S D , Krikun A I , Feoktistova V V 
Published: June 2021

Abstract
The authors carried out a series of experimental studies to research the changes of properties in mechanically activated water and suspensions. This article presents a part of the combined temperature and hydrogen exponent studies carried out at two different universities, using two separate approaches to mechanical dispersion. Study I used a planetary whisk mixer, whereas study II used a vibrating mechanical activator, which is a modern alternative to dispersion devices used at food production facilities. The research of the properties of mechanically activated water and liquid suspensions using these methods was conducted due to both the importance of these substances for all areas of the food production industry, and the modern development of technologies and techniques used at production facilities, as well as the lack of unity among the numerous research studies conducted by leading scientists specializing in the study of the properties of water, liquid suspensions and emulsions in resting and activated states. The results of the experimental studies conducted directed authors to conduct further research of mechanically activated suspensions during the filtration process.
Ensuring the collection of mechanical engineering products, taking into account the tolerances for computer-aided design in “GePARD.3D”
Authors: Zhuravlev D , Khvaschevskaya L , Shabalin A , Gaer M 
Published: June 2021

Abstract
The article discusses a geometric approach to ensuring the assembly of mechanical engineering products, taking into account the spatial permissible deviations of components in computer-aided design using configuration manifolds and biquaternions. The main advantage of this approach is the modeling of assemblies taking into account the tolerances with the possibility of direct access to the tree for constructing the 3D model of the product, which greatly facilitates the user’s work. The developed configuration model of the assembly and the technology for analyzing spatial dimensional relationships in the product, taking into account the tolerances and using biquaternions, allow obtaining analysis results with predictable accuracy already at the stage of geometric modeling.
Binary control characteristics of resistive models of the induction devices
Authors: Tyapin A A , Panteleev V I , Kinev E S , Efimov S N , Bezhitsky S S 
Published: June 2021

Abstract
The article presents an approach to the construction of parametric models of power circuits for metallurgical induction devices. The parameters of the equivalent circuit of inductors intended for mixing the aluminum melt or heating it before extrusion have components determined by the properties of the secondary element. The properties of the metal change during heating, therefore, in order to create adequate mathematical models, the simulation systems should take into account the change in reactivity and losses. Staged control of reactivity using controlled keys is considered traditional. Adjustable resistive components of equivalent circuits are rarely used. As a means of controlling the mode of equivalent resistive two-terminal devices, a code impulse action on the switches is proposed, which changes the impedance in dynamics. Controlling the step of the impulse action on two-pole models with their serial, parallel and mixed connection, can provide the required smooth nature of the resistive conductivity change. To carry out a numerical experiment, two-pole switchable models of different bit sizes have been built, which have the properties of analog-digital elements. The study of typical circuits of parametric links was carried out using a circuit simulator, while examples of adjusting characteristics of operating and system parameters were obtained. In the course of a numerical experiment, a solution was obtained for a set of operating parameters of an induction device, reflected by a family of vector diagrams.
Methods of diagnostics of electrical equipment by fiber-optic sensors on the Faraday Effect
Authors: Levina T M , Bilalova D N 
Published: June 2021

Abstract
One of the important problems in the operation and creation of a complex technical system is the provision of diagnostics of electrical equipment. This is especially important when diagnosing electrical equipment at an industrial complex belonging to the class of spark -explosive production facilities. The task of ensuring the operability of electrical equipment and preventing emergency situations due to timely detected breakage or violation of the insulation properties of the equipment includes a whole range of certain measures. In the process of operation, technical diagnostics of electrical equipment occupies a special place among complex technical devices at oil refineries. One of the most modern sensors for diagnosing electrical equipment is multiplicative sensors, which use optical fiber. Fiber-optic sensors have special proper-ties. The Faraday Effect is the basis for the construction of fiber-optic sensors for diagnostics of electrical equipment. Methods for diagnosing electrical equipment with fiber-optic sensors based on the Faraday Effect depend on the principles of the sensors themselves. This article presents the results of the study of the creation of experimental fiberoptic sensors based on the Faraday Effect. In this paper, it is proposed to carry out diagnostics of electrical equipment at an industrial complex belonging to the class of spark - explosive production facilities, such as oil refineries, using the use of fiber-optic sensors based on the Faraday Effect.