bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on Physical Effects of Optical Fiber Transmission Characteristics Under Nonlinear Optical Effects
Authors: Lu Jing
Published: June 2021

Photonic crystal fiber has a special light guiding mechanism and structural tunability, which can produce singular dispersion characteristics and high nonlinearity, which provides new conditions for the research in the field of nonlinear fiber optics. Due to the combined action of a variety of nonlinear optical effects, photonic crystal fibres with different structural parameters and transmission characteristics can produce rich nonlinear spectra under different pump light pulse parameters. We use the photonic crystal fiber cladding section to conduct nonlinear optical experimental research, and obtain the broadband spectral output of soliton wave and dispersive wave. The theoretical analysis and experimentally measured spectra include blue-shifted dispersion waves in the visible light band near 0.5 μm, residual pump light in the 0.82 μm band, soliton waves in the 1.1 μm band, and red-shifted broadband dispersive waves near 2 μm. Corresponding to this, the formation and redshift of solitons can be clearly seen in the time domain, and there is no more oscillation secondary peak in the femtosecond transmission pulse.
Application of AsiaSat-3S satellite in CAPS system
Authors: Hu Zhengqun , Zhang Lirong , Zhang Lirong , Zhang Lirong , Zhang Lirong , Lü Chang , Pei Jun , Ma Lihua
Published: June 2021

CAPS is an integrated system of navigation and communication. The orbit position of AsiaSat-3S satellite has been pushed from 105.5E to 147.5E. It has become a SIGSO satellite, which plays a certain role in improving the constellation DOP of CAPS navigation system. According to the characteristic parameters of AsiaSat-3S satellite (mainly including orbit parameters, polarization parameters, frequency offset parameters, etc.), this paper expounds the changes of azimuth, elevation angle and polarization angle of 16-meter paraboloid antenna in Tianjin pointing and tracking AsiaSat-3S satellite in CAPS ground system, and analyzes the dynamic changes of frequency offset of AsiaSat-3S satellite transponder through the spontaneous receiving of navigation signals The parameter model prediction of CAPS repeater navigation system has a good reference value.
Precision Analysis of Solar Astrometric Positions from the JPL DE431 Ephemeris
Authors: Ma Lihua , Wang Xiaolan , Pang Feng , Kong Ting
Published: June 2021

The DE (Development Ephemeris) series of planetary ephemeris released by NASA’s Jet Propulsion Laboratory (JPL) have been widely used in deep-space navigation, interplanetary exploration, analysis and reduction of high-precision astronomical observations, and calibrations of gravitational theories etc. This work takes solar astronomic positions as an example to analyze precision of the JPL DE431 planetary ephemeris data. The results show that the DE431 ephemeris has high precision, which can be guaranteed within 0.08 milliarcseconds (mas), and can be used to carry out high-precision calculation of planetary positions.
Research on navigation and positioning Technology based on opportunity signal of low orbit satellite
Authors: Li Shenyang , Wang Haitao
Published: June 2021

Global Navigation Satellite System (GNSS) signals to the Earth’s surface are weak, vulnerable to interference, and require significant infrastructure investment to keep them operating. In order to get rid of the dependence on GNSS navigation system and overcome the problems such as shadow occlusion and malicious interference, opportunity signal is used to realize positioning to make up for the shortcomings in this aspect. Aiming at the limitation of coverage and availability of land-based opportunity signals at present, the opportunity signals of low-orbit satellites have the advantages of high signal power, wide coverage and no need to build additional infrastructure, etc. Therefore, space-based opportunity signal positioning by using low-orbit satellite system can be used as an effective backup or supplement to GNSS system. In this paper, the signal communication system of low orbit satellite is studied deeply, and the Doppler frequency information is obtained by using the single tone signal of the pilot frequency of low orbit satellite, and the mathematical model of instantaneous Doppler positioning and its geometric factor of accuracy is established, so as to realize the positioning ability of opportunity signal of low orbit satellite. The simulation results show that the positioning accuracy is better than 200 m using the actual low orbit satellite signals. The research results have reference significance for the theoretical research and application of location technology based on opportunity signal. By studying the communication system of low orbit satellite signal, the mathematical model of instantaneous Doppler positioning is established, and the method of obtaining Doppler frequency information by using the single tone signal of low orbit satellite signal and combining the satellite orbit information calculated by the orbit prediction model to realize low orbit satellite positioning is proposed. The measured data verification results show that the positioning accuracy of 100 meters can be achieved by using the LORB opportunity signal, and the research results have reference significance for the theoretical research and application of positioning technology based on the LORB opportunity signal.
Performance Analysis of GNSS Receiver allied in High-Orbit Based on SoC Platform
Authors: Liu Xianyang , Tian Xiaobin , Pei Dongbo , Liu Lei , Yu Qian
Published: June 2021

GNSS receiver technologies allied in high orbit altitudes has developed rapidly in recent years and has been used in orbit on many spacecraft. In this paper, TJS-5 Satellite is taken as an example to illustrate the design scheme of the high orbit navigation receiver based on the SoC platform, which takes the characteristics of the weak signals of GEO orbit navigation into consideration, and adopts the high sensitivity acquisition technology and the fast signal acquisition technology. Finally, the 19-day in-orbit data of TJS-5 Satellite are analyzed. The number of available satellites is between 4 and 8, the position accuracy of orbit determination is 15.8133m and the velocity is 0.012108m/s, which meets the needs of autonomous positioning and precise orbit determination in the whole orbit period of the satellite. The calculated results are compared with those of TJS-2 satellite.
Data Collection of Digital Monitoring System for Agricultural Facilities Environment
Authors: Li Feifei , Wang Hongling , Sun Lu , Wang Zilin , Ran Yuting , Xia Yingjun
Published: June 2021

In order to realize the intelligent control of the agricultural facility greenhouse environment cluster, the paper designs and implements an agricultural facility greenhouse environment cluster monitoring system based on RS485 bus and Modbus protocol. The system consists of on-site data acquisition and control part, remote monitoring centre monitoring software part and communication protocol part. We use the RS485 bus with Modbus protocol to realize the communication between the monitoring centre host and the microcontrollers of each greenhouse. The paper uses the BP neural network PID control algorithm to achieve the intelligent control of the agricultural greenhouse environment. Use Qt software to design a human-computer interaction interface to realize remote control of the greenhouse cluster. The experimental results show that the system can correctly collect the temperature, humidity and light intensity of the agricultural greenhouse environment, and can effectively control the environmental parameters of each greenhouse through the action of the control relay.
Surface heating control during low-temperature plasma treatment
Authors: Brzhozovsky B , Martynov V , Zinina E , Permyakov S
Published: June 2021

The main features of the process reflecting product surface heating during low-temperature plasma treatment have been established, and the necessity of managing this process has been substantiated. A control method has been developed that makes it possible to determine the moment of termination of the plasma effect on the product surface using a logistic curve as a data model on the temperature recorded outside the zone of thermal plasma effect (lagged temperature).
Surface hardening of 35KhGSA steel samples on the MAK-10 plasma modification machine
Authors: Ilinykh S A , Krivorogova A S , Ilinykh N I , Ignat’eva E V , Korolev O A , Marshuk L A , Krashaninin V A , Gelchinsky B R , Leontiev L I
Published: June 2021

The plasma modification unit UPM MAK-10 developed in IMET UrO RAS was used for surface hardening samples of 35KhGSA steel. As a result, it leads to an increase in the tribological characteristics of products (hardness and wear resistance, etc.) and, consequently, increases the service life of various machines and mechanisms.
Microstructure and properties of a silicon coating deposited on a titanium nickelide substrate using molecular-beam epitaxy equipment
Authors: Krukovskii K V , Kashin O A , Luchin A V , Kohanenko A P , Dirko V V , Lozovoi K A , Kashina O N , Bobrov D I
Published: June 2021

The microstructure and properties of a silicon coating on a titanium nickelide substrate were studied to assess the possibility of using such a coating to improve the biocompatibility of medical implants. The silicon coating with thickness of 4.0±0.5 microns was applied to the TiNi substrate on a molecular beam epitaxy unit. The coating had a submicrocrystalline structure with a crystallite size of 0.1…0.2 microns, a developed surface, and high crack resistance.
Effect of annealing on the morphology and mechanical properties of phosphorus-doped nickel coatings obtained by cathodic arc evaporation
Authors: Lapitskaya V A , Kuznetsova T A , Khabarava A V , Trukhan R E , Chizhik S A , Delendik K I , Voitik O L , Kuprin A S , Kudin D V , Koneru A , Bortnitskaya M A
Published: June 2021

The results of an atomic force microscopy study of the surface of nickel coating doped with phosphorus of 2 μm thick obtained by cathodic arc evaporation after the annealing at temperatures from 100 to 500 °C are presented. The surface morphology changes significantly with an increase in the annealing temperature. A negative high correlation between the specific surface energy and the coating roughness after the annealing was established. The mechanical properties (microhardness, elastic modulus and plastic deformation) were determined by nanoindentation. A decrease in the elastic modulus of the nickel coating with an increase in the annealing temperature was found.
Microstructure, mechanical and hydrophilic properties of two-layer nanostructured TaN/Ta2O5 coatings
Authors: Petrovskaya A S , Lapitskaya V A , Khabarava A V , Melnikova G B , Kuznetsova T A , Chizhik S A , Zykova A V , Safonov V I
Published: June 2021

The microstructure, mechanical and hydrophilic properties of two-layer TaN/Ta2O5

coatings on stainless steel and silicon wafers were studied using atomic force microscopy (AFM), nanoindentation (NI) and sessile drop method. It was found that the two-layer films are characterized by a granular structure with low roughness values. The average values of the elastic modulus and microhardness for TaN/Ta2O5 were 130 GPa and 8.7 GPa, respectively. The contact angles for the two-layer coatings were 95.1° 90.0° on the steel and silicon substrates, respectively.
Formation of droplets in a heterophasic amorphocrystalline nanopowder Bi2O3 produced by pulsed electron beam evaporation in vacuum
Authors: Sokovnin S Yu , Ilves V G , Murzakaev A M
Published: June 2021

In the present work, a mesoporous multiphase amorphous crystal nanopowder Bi2O3 with a specific surface area of up to 23 m2/g was produced by pulsed electron beam evaporation in vacuum. Influence of thermal annealing (200-500 °C) of powders in air is investigated. The formation of droplets with a size of 3-5 nm on the surface of all large nanoparticles constituting the framework 3D nanopowder agglomerates was found due to extrusion of liquid bismuth from the volume during cooling.
Application of complex niobium nitrides as heat-protective and wear-resistant coating materials for cutting tools
Authors: Tabakov V P , Chikhranov A V , Dolzhenko Y A , Vlasov S N
Published: June 2021

The results of investigations of the contact temperatures on the front surface and the thermal state of cutting wedge of carbide tool using coatings based on complex niobium nitrides are presented. The efficiency of using carbide tools with developed wear-resistant coatings is shown. Further use of the developed coating compositions for creating multilayer coatings is proposed.
The impact of fintech on the profitability of state-owned commercial banks in China
Authors: Wu Guo , Yuan Hongfei
Published: June 2021

Fintech is the innovative use of technology in the design and delivery of financial products and services. This study aims to statistically investigate the fintech and other determinants that affect the profitability of six state-owned commercial banks (SOBs) in China using the data from the 2014-2019 period. Theoretically, fintech serves as a disruption for its banking services through adverse impacts on asset business, liquidity business and intermediary business. Empirically, the result shows that the development of fintech has a negative impact on the profitability of SOBs and the regression results from the OLS estimation, the FGLS estimation, the Prais-Winsten estimation and the FE estimation are compared to ensure the validity of the statistical inference.
Improved High Precision Aircraft Target Detection Method of YOLT
Authors: Mao Jiaxing , Zhang Xinyu , Ji Yang , Zhang Zhen , Guo Zihao
Published: June 2021

The first remote sensing dataset that can be used for aircraft target detection is created and a 3D model simulation method for data augmentation is proposed. After statistical analysis of aircraft sizes, a high-precision improved YOLT method for target detection is proposed. YOLT is the first light algorithm focusing on target detection in remote sensing images. We improve its network structure, design a creative method based on receptive field improvement and adopt an optimized non-maximum suppression strategy. The results show that our method has better performance than other main target detection algorithms, especially for small targets and cross-scale samples.
Performance Analysis and Optimization of Nginx-based Web Server
Authors: Wang Jundi , Kai Zhao
Published: June 2021

Performance optimization and analysis of Web server is one of the key technologies of Web server. Through the analysis of the work flow and working principle of the Web server, some influencing factors that are in line with the current environment and have feasibility are selected for targeted optimization, such as value of a thread or process, live time, cache size. Through optimization, the comprehensive performance of Web server based on Nginx has been greatly improved.
Applications Research of Blockchain Technology in Accounting System
Authors: Zheng Ruirui
Published: June 2021

Accounting is the business language of social economy. The in-depth application of blockchain technology in the accounting industry can promote the development of the accounting industry itself, and also further promote the blockchain technology to play a higher role in the whole social economy. This paper studies the necessity and feasibility of the application of blockchain technology in the accounting industry, discusses the working principles of the accounting information system of the seller and the buyer, and constructs the vertical and horizontal application models of blockchain technology in the accounting system. Finally, this paper points out that we can strengthen the promotion of applications of blockchain technology in the accounting system by strengthening policy guidance, improving legislative protection, and cultivating compound talents.
COVID-19 Propagation Prediction Model Based on Machine Learning
Authors: Liu Yunxiang , Xiao Yan
Published: June 2021

The continuous spread of COVID-19 virus around the world has exerted a great impact on the world’s economy and security. China took the lead in responding to the epidemic with a positive attitude and contributed valuable experience to the fight against the epidemic for people around the world Based on the COVID-19 epidemic data published by the National Health Commission, this study established a time series of the number of newly diagnosed patients on a daily basis. The SIR model of transmission dynamics was used to determine the trend and inflection point of the epidemic, and the SVR algorithm was used to reasonably predict and analyze the number of newly diagnosed patients on a daily basis.
Evolution of Global EV Battery Technology Based on the Main Path of Patent Citation
Authors: Yan Duanwu , Deng Xiaocong , Mei Xirui
Published: June 2021

Based on the patent data collected from European patent database search, this paper firstly analyzes the general situation of electric vehicle battery field in terms of patent application trend, regional distribution and technology field distribution, then constructs patent citation networks in different development stages and identifies the main path of patent citations by SPC algorithm. Finally, the technological evolution process in the field of electric vehicle battery is analyzed by combining visualization mapping and patent texts. The research results show that the evolution direction of electric vehicle battery technology gradually converges, and fuel cell technology is the most critical technology in the whole technology development process.
The dynamics mode of production structure in the Patorani community in Takalar district
Authors: Halik H A , Salman D , Darma R , Arief A A
Published: June 2021

Business activities of torani fish eggs as an integral part of the rural economic system influenced by the presence of the capitalist system. The values of capitalism are absorbed and practiced by some people in their economic activities so as to give birth to more than one mode of production. The presence of more than one mode of production makes one dominate the other. This collision of production modes encourages the articulation of production modes, resulting in a new social formation. This study aims to describe the structure and articulation mode of production that takes place in the Patorani community in Takalar district. This research was conducted using a qualitative approach with a case study strategy. The results of this study indicate that the mode of production structure that takes place is more characteristic of the capitalist mode of production. The capitalist mode of production dominates the non-capitalist mode of production, resulting in articulation of the means of production to meet market demands.
Comparison of Viability and Efficacy of an Immobilized Bacterial Consortium in Four Different Carriers to Degrade Oil
Authors: Darmayati Y , Wiranata Y , Afianti N F , Manurung B
Published: June 2021

This research aimed to evaluate the storage system’s effect on immobilizing bioremediation agents’ performance in four different carriers (Perlite, Silica, Vermiculite, and Zeolite). Measured parameters were the viability and efficacy of artificial bacterial consortium (Bacillussp.,B. licheniformis, andEnterobacter cloacae) immobilized in the four porous rock carriers by lyophilization. They were stored at room temperature (25-27°C) for three months. The experiment was taken place in a microcosm system with three replicates for 28 days. The results indicate that storage of immobilized bacteria for three months at room temperature will affect their viability. The efficacy of immobilized bacteria in Vermiculite and Perlite reached the highest rate until the first week, 61.44% and 60.18 %, respectively. However, the efficacy in decreasing oil concentration of immobilized cells in the four carriers was almost similar (90.53 – 91.63%), with no significant difference between each other in the late stage. This is very different with control, decreasing oil in only 10.85 - 13.57%, except in control with fertilizer (Cp) supplemented (90.63%). We conclude that bioremediation will improve oil removal. However, storage at room temperature for three months will decrease the performance of these immobilized cells.
Ecosystem biotechnologies for the enhancement of ecohydrological potential of the catchments – Water, Biodiversity, Ecosystem Services, Resilience, Culture and Education
Authors: Zalewski M
Published: June 2021

One of the threats for biosphere sustainability in the face of climatic changes is the amplification of water and nutrient cycling stochasticity, which means intensive floods, droughts, and pollution. This is largely due to the increase of industrial agriculture and random urbanization, which results in a cumulative impact. To reverse the effect of cumulative intermediate impacts, which often are major factors of degradation of the ecological potential at catchments, a profound understanding of the water-biota interplay is most important. This is because water has been the major determinant of ecosystem structure as it drives carbon, phosphorus, and nitrogen cycling and determines ecosystem services for society. Thus the fundamental for the development of innovative Ecohydrological Nature Based Solutions (EH NBS) for water is the profound understanding of water–biota interplay from molecular to catchment scale. The above Ecohydrological framework serves not only to mitigate intermediate forms of impact but also to increase the ecological potential of a river basin expressed by a multi-dimensional goal – Water, Biodiversity, ecosystem Services for society, Resilience to climatic changes, Culture, and Education (WBSRCE), which helps to harmonize the enhanced ecosystem potential with social needs and, in turn, achieve sustainability of river basins. As far as Ecohydrology is empirical science, international advanced study courses where scientists, and pro-activists can share experience at UNESCO IHP Demosites should also be an important tool for dissemination.
Research on the mechanical properties of reinforced steel fiber concrete column under impact loading
Authors: Yantao Jiang , Chuanyun Xiong , Peiding Wang
Published: June 2021

In order to study the effect of different slenderness ratio and axial compression ratio on the lateral impact resistance of reinforced steel fiber reinforced concrete columns, the impact models with different slenderness ratio and continuously varying axial compression ratio were established to analyze the lateral impact resistance of the components. The results show that the proper axial compression ratio is helpful to improve the anti-impact ability of the components. Under normal working conditions, columns with a slenderness ratio of less than 6.5 are recommended to not exceed the axial compression ratio 0.6, for columns with slenderness ratio greater than 12, the axial compression ratio should not be less than 0.3. For columns that may be subjected to impact, the slenderness ratio should not exceed 14.
Causes of Work Safety Accidents in Railway Construction Engineering
Authors: Du Zhuoqun , Liu Yisheng
Published: June 2021

Work safety accidents that occurred in railway construction engineering could cause casualties and economic losses. Analyzing the trends and causes of accidents is helpful to reduce the occurrence of an accident. In this paper, the 108 work safety accident cases from 2005 to 2020 are collected and analyzed by statistical method. The complex network theory is used to construct causation model in collapse accident. The analysis results show that from 2015 to 2020 the largest number of accidents that occurred during railway construction are in lines, followed by tunnels and bridges-culverts. The occurrence frequency of work safety accidents from May to July is significantly higher than other months. The results also show that the nodes (construction personnel operate in violation of rules and regulations and inadequate management in construction site) are of high value.
Study on early basic mechanical properties of inorganic polymer-based fast-hardening concrete
Authors: Xia Wei , Xu Jinyu , Luo Xin , Yao Ao
Published: June 2021

In order to predict the application effects of inorganic polymer-based fast-hardening concrete (IPFC) in pavement emergency repair, the slag, fly ash and silica fume were used as solid cementitious materials, and sodium hydroxide and sodium silicate were used as alkali-activators to prepare IPFC specimens. The change rules of the basic mechanical properties of the specimens with different slag, fly ash and silica fume contents in early stage were studied by experiments. The results show that, the early compressive strength of each group of specimens is more than 20 MPa and that of slag-based fast-hardening concrete (SFC) specimens is the highest. SFC specimens have the highest bending strength when they are cured for 2 h, while the silica fume/slag-based fast-hardening concrete (SSFC) specimens have the highest bending strength when the curing time is up to 3 h.
The design and implementation of the auxiliary calculation system for geotechnical engineering index and parameters
Authors: Xu YR , Zhou YM , Liu YH , Yin YB
Published: June 2021

A program based on Visual Basic for the auxiliary calculation and statistical analysis of geotechnical engineering index and parameters is introduced in this paper. The application methods and skills of the program are illustrated with examples. This program contains 10 main calculation modules of geotechnical, a total of 23 different index calculation methods were integrated in it. Through this program, users only need to input the original data of geotechnical engineering tests of different projects and plots, and can quickly conduct the statistical analysis of geotechnical engineering parameters in a certain area, and can also compare the significance of differences among various factors. It is simple to operate, and the results are accurate and reliable, which can greatly improve the efficiency of parameter calculation and calibration in the practice of geotechnical engineering, and ensure the accuracy and precision of the calculation results.
Static load test of RC T-beam bridge flexural strengthening with externally bonded steel plates
Authors: Zheng Xilong , Du Hao , Zhang Runbo , Ma Qinglin , Gao Hongshuai
Published: June 2021

Externally bonding steel plates is a common method for strengthening old bridges. Structural features and diseases of T-beam bridge are described. The strengthening project of Erdao River Bridge was taken as an example. Based on static load test, changes of deflection and stress are studied at the bottom of RC T-beams strengthened by externally bonding steel plates in the loading process. Numerical simulation is also carried out. The results of static test show that bearing capacity, bending stiffness and deformation can be improved of T-beams strengthened with bonding steel plates. This paper provides good engineering practice experience for the reasonable application of bridge with externally bonding steel plate strengthening method.
Research on the Operation Mode of Infrastructure Projects Based on “REITs+PPP”
Authors: Jin Yu , Xu Ren
Published: June 2021

Based on the complex international situation and the continued impact of the epidemic, infrastructure investment has become an important means to promote domestic economic recovery, combined with infrastructure public offering REITs policy documents, constructing an operation mode combining “REITs+PPP”, analyzing the operation process and applicable project scope of the operation model, Finally, the main problems existing in the model are explained and corresponding solutions are proposed.
Effect of curing method on compressive strength of rapid hardening sulphoaluminate cement mortar at -10 °C
Authors: Wang Zhihang , Bai Erlei , Wang Han , Meng Xin , Luo Xin , Huang He
Published: June 2021

Rapid hardening sulphoaluminate cement has been widely studied and applied under low temperature, normal temperature and high temperature conditions, but the research under negative temperature conditions has just started. Through three curing methods: constant negative temperature curing, negative temperature changing positive temperature curing, and pre-curing, the influence of different curing methods on the compressive strength of rapid hardening sulphoaluminate cement mortar at -10 °C is discussed. The results show that pre-curing measures can significantly improve the early compressive strength of rapid hardening sulphoaluminate cement mortar. The longer the pre-curing time, the greater the compressive strength. Under the condition of -10 °C, the rapid hardening sulphoaluminate cement can still be continuously hydrated, and the hydration products remain unchanged.
Analysis of Influence on the Super-Large-Diameter Shield Tunnel by Stockpile Unloading
Authors: Wang Sheng , You Guangming , Liu Nian , Zhang Yazhou , Yu Chunlong
Published: June 2021

As the super-large-diameter shield tunnel sprouts up, there will be more and more constructions adjacent to the super-large-diameter shield tunnel. As the newly-built structure changes the existing stress field, it will inevitably deform the super-large-diameter shield tunnel and bring hazard. Based on the soil stockpile adjacent to Ying Bin San Lu shield tunnel in the flight area of Shanghai Hongqiao Airport, the digital model was established by PLAXIS finite element analysis software to analyze the influence on the super-large-diameter shield tunnel by the soft soil area and different stockpile unloading time sequence. According to the findings, it’s recommended to carry out massive stockpile unloading adjacent to the shield tunnel in section and in layer and conduct unloading first when far from the tunnel, thereby minimizing influence on the shield tunnel.
Transportation organization design of Tangshan West Comprehensive Passenger Terminal
Authors: Sun Jingcheng
Published: June 2021

Tangshan West Comprehensive Passenger Terminal is an important passenger terminal of Tangshan West Railway Station. The purpose of this paper is to make a scientific and reasonable transportation organization design for Tangshan West Comprehensive Passenger Terminal Station, in order to improve the passenger travel service capacity of Tangshan West Comprehensive Passenger Terminal Station, and provide a good travel experience for the passengers. Based on the analysis and introduction of the internal structure of Tangshan West Comprehensive Transportation Hub Station, the paper designs the traffic organization of Tangshan West Comprehensive Transportation Hub Station according to the existing design scheme. The author through to the passenger flow and traffic flow, traffic flow data of field investigation, and analyzes the passenger’s behavior characteristics, and after consulting relevant literature, calculate and determine the passenger’s travel of the law on passenger station may arrived. At the end of the article, the passenger emergency evacuation plan is proposed and the specific implementation content is designed according to the corresponding situation.
Research on Shanghai Port Logistics Based on VAR Model
Authors: Ji Weiwei
Published: June 2021

This article mainly analyzes how to use the vector autoregressive VAR model to study the development of Shanghai port logistics. First, the use of co-integration test to analyze the long-term co-integration relationship between Shanghai port logistics and the regional economy; Then, by constructing a vector autoregressive model of port cargo throughput and Shanghai’s GDP, construct an impulse response function to analyze the dynamic mechanism between the two; Then analyze the contribution rate between the two through variance decomposition.
A LMM-based seismic fragility analysis method for bridges
Authors: Liu Xiaolu
Published: June 2021

The common seismic fragility analysis methods are mainly inaccurate due to assumptions made in derivation process or time consuming because of large sample analysis. A new approach based on lognormal mixture model (LMM) is presented for seismic fragility analysis of long-span bridges, where LMM is used to calculate the structural demand distributions and the seismic fragility is obtained through cumulative distribution function. To demonstrate the feasibility of the present approach, seismic fragility analysis is carried out on a long-span suspension bridge with a main span of 1200m. The results show that the present approach has higher accuracy than the classical approach.
Research on the Development of Microcapsules and Their Potential Applications in Tibet Plateau
Authors: Wang Tingting , Li Xin , Liu Hao , Wang Shifeng
Published: June 2021

Microcapsule refers to some miniature containers or packages with polymer wall shells developed from natural or synthetic polymer materials. The shape is generally spherical, and the particle size is generally from a few microns to a few hundred. Microcapsule is a micro packaging technology that can wrap solids, liquids, and gases. The process of preparing microcapsules is called microencapsulation, which has the advantages of isolating the core material to reduce the influence of external environmental factors, enhancing the stability of the core material, concealing unpleasant odors, reducing the toxicity of the core material, increasing the utilization rate of the core material. With the continuous development of technology, the application prospects of microcapsules are gradually broad in the fields of food, cosmetics, medical engineering, production and construction, textiles and other fields. In this paper, firstly the development, fabrication techniques of microcapsules, and the materials forming cores and walls were reviewed. Secondly the applications of microcapsules in various areas were summarized. Because of the wide range of application scenarios, they hold great potential for the environmental applications in Tibet Plateau, such as the water treatment, nutrient regulation of the characteristic plants for Tibetan medicine.
Comparative Analysis of Civil Engineering Quantity Calculation Based on Glodon GTJ and Revit
Authors: Hongyan Wang , Wen Wen
Published: June 2021

Diversified BIM software have been generated in recent years with the high-speed economic development and fast progress of computer technology in China. BIM technologies have been widely applied in construction engineering, e.g., the calculation of engineering quantities, where the modeling method and data importing method in 3D graphics quantity calculation software have been mainly used. In this study, the technical features of Glodon GTJ and Revit software as well as the possible errors of the two software in the engineering quantity calculation were analyzed. Taking the civil engineering of Ganglin C-01 Phase II high-standard plant as an example, the two software were used for the civil engineering modeling, the concrete engineering were calculated, the reasons for the errors in the engineering quantities were analyzed according to the calculation results, and through the extensive analysis and calculation, it was finally obtained that the errors were not only related to the limitations of two software but more correlated with the professional quality of technical personnel.
Research status of new reinforced concrete box structure
Authors: Zhang Xiaomeng , Wang Qiaji , Ren Qingying , Liu Wenting , Ding Weilun
Published: June 2021

This paper presents a new type of prefabricated concrete structure system and the corresponding shear wall structure. The development status of the new shear wall system in various countries is described, and the advantages and disadvantages of the new shear wall as well as the research status are analyzed.
Influence of microcapsules on rheological properties of asphalt mortar
Authors: Guo Zhaotu , Fang Xiangzheng , Hu Yonglin , Si Botong
Published: June 2021

In order to study the effect of microcapsules on the rheological properties of asphalt mortar, microcapsules were prepared by interfacial polymerization and mixed with 70# matrix asphalt and SBS modified asphalt in different proportions to prepare two kinds of microcapsule asphalt mortars. The rheological properties of asphalt mortar were measured by dynamic shear rheological experiment and curved beam rheological experiment. The test results show that the microcapsules prepared by the interfacial polymerization method have a smooth surface, a high coating rate, and an average particle size of about 14.3μm; in the high temperature rheological properties, the rutting factor of the two asphalt mortars showed varying degrees of reduction with the increase of the microcapsule content. When the content of microcapsules is greater than 0.6%, the high temperature rheological properties of the microcapsule asphalt mortar do not change significantly; in the low temperature rheological properties, the creep stiffness modulus S gradually decreases with the increase of the microcapsule content, and the creep rate m gradually increases with the increase of the microcapsule content.
Evaluation of risk for construction safety of fabricated buildings based on analytic hierarchy process
Authors: Feiyu Cheng , Yisheng Liu
Published: June 2021

In order to assist the construction safety risk control of fabricated building, 17 safety risk factors were identified from the five dimensions of man, machine, material, management, and environment. The safety risk evaluation index system of the fabricated building construction stage is constructed based on the AHP (Analytic Hierarchy Process). The risk level is divided according to weight. The results show that the focus should be on the on-site safety staffing, the professional ability of the operators, the quality of additional tools, and the overhaul and maintenance of mechanical equipment. Enough attention should be paid to material storage and maintenance, operator safety awareness, deployment of safety protection measures, transportation protection measures, operator protection work, mechanical equipment selection, natural environment, safety inspection work plan, prefabricated component production quality, mechanical equipment installation, and removal. General attention should be paid to the surrounding environment, the safety production responsibility system, and the construction site environment.
Demand Analysis of Emergency Rescue Engineering Machinery Based on AHP and QFD
Authors: Jiao JingYi
Published: June 2021

Aiming at the problem of emergency rescue engineering machinery and equipment demand analysis, the demand analysis method based on AHP and QFD is used to establish an index system. Through the analysis of the AHP method and the construction of the house of quality method, the mapping relationship between user needs and equipment performance requirements is completed. It better solves the processing relationship from user needs to equipment performance requirements, and provides a reference for the system design of rescue engineering machinery.
A study on characteristics of flow field around vehicle body
Authors: Zhao Ruochen , Liu Zhen , Liu Yinzhen , Luo Xiaobo , Sun Yanan
Published: June 2021

A numerical simulation calculation is performed using large eddy simulation method to investigate the characteristics of flow field around vehicle body, analyze the change rules of the velocity and pressure of the three-dimensional flow field around the vehicle body, as well as the frequency domain characteristics of the aerodynamic coefficients in the vehicle body. The results reveal that with the gradually expanding distance from the rear of the vehicle body, the velocity in the flow field around the vehicle body gradually recovers and reaches the incoming flow velocity at 0.9m from the rear of the vehicle body. Within the range of 0∼50HZ, the resistance coefficient and lift coefficient undergo a peak attenuation to about 20%, with a fluctuation of aerodynamic coefficient mainly within the range of 0∼500HZ. The research results are of certain significance and value for analyzing and applying the characteristics of flow field around vehicle body.
Analysis of the influence of erection of scissor braces on the bearing capacity of the wheel-buckled steel pipe supporting formwork system
Authors: Jia Shilong , Meng Xiangrui , Chen Zhongliang , Zhao Lei , Su Yanming , Li Hang
Published: June 2021

The supporting formwork system as one of the most commonly used temporary structures in the process of building construction, its safety accidents frequently occur. The wheel-buckled steel pipe supporting formwork system is a new type of system developed under this background, and scissor brace as a kind of component in the system, have played an important role in improving the bearing capacity of the system. This paper uses ABAQUS finite element analysis software to establish an accurate simulation model of the foundational frame, and on the basis of this model, explores the influence of different erection methods of vertical and horizontal scissor braces on the overall bearing capacity of the frame. When erecting vertical scissor braces to reinforce the foundational frame, priority should be given to erect on the outer facades around the frame, and secondly consider satisfying the arrangement on the three facades. In the process of erecting horizontal scissor brace, the priority of the erected horizontal layer should be considered, that is the sub-bottom horizontal layer, sweeping rod horizontal layer, middle horizontal layer, sub-top horizontal layer, top horizontal layer.
Performance-based Rapid Evaluation Method for Post-earthquake Traffic Capacity of Bridge System
Authors: Li Zihao , Ren Leping , Yuan Haoyun
Published: June 2021

As the key node of highway transportation line, bridges are easy to be damaged under earthquake. When bridge earthquake damage occurs, traffic will often be interrupted, resulting in traffic network paralysis in disaster areas, seriously affecting the development of post-earthquake rescue work, thereby further aggravating the loss of personnel and property. In this paper, a performance-based method for evaluating the post-earthquake capacity of bridge system is proposed, and the post-earthquake operational status of the bridge system is evaluated. The results show that the performance-based assessment of bridge capacity after earthquake is of great value in evaluating the operation status of bridge system and making operational management decisions. Based on the fragility analysis of bridge components, the I-PCM method can be used to quickly establish the fragility curve of bridge system; meanwhile, combined with the performance-based evaluation model of seismic damage bridge capacity, the rapid evaluation of bridge capacity after earthquake is completed.
Research on the Efficiency of Beijing Tianjin Hebei Logistics Industry Based on Three Stage DEA Model
Authors: Zhang Jie , Li Yanxia
Published: June 2021

In order to explore the impact of external environmental factors on the efficiency of logistics industry in Beijing Tianjin Hebei region, this paper uses Three-stage DEA method to study the efficiency of logistics industry in Beijing Tianjin Hebei region from 2013 to 2017. The results show that the overall logistics efficiency of Beijing Tianjin Hebei region is in a good state, but it does not reach the optimal state. After the adjustment, the pure technical efficiency and scale efficiency have obvious changes, which indicates that the external environmental factors such as the consumption level of residents, the total amount of telecommunications business and the total retail sales of regional social consumer goods have a significant impact on the efficiency of the logistics industry, Relevant departments can put resources in a targeted way to promote the efficiency of Beijing Tianjin Hebei logistics industry.
Analysis on the structure of port collection and distribution in China
Authors: Xu Dongyuanfang
Published: June 2021

On October 29, 2015, Xi Jinping’s speech at the Second Plenary Session of the Fifth Plenary Session of the Eighteenth Central Committee of the Communist Party of China clearly put forward the development concept of innovation, coordination, green, openness and sharing. The new development concept conforms to my country’s national conditions and conforms to the requirements of the times. In the development of the port and shipping industry, green shipping is becoming a new trend in the development of the port and shipping industry. The adjustment of the transportation structure of the port collection and distribution system is an important aspect of green shipping. The “Railway to Railway” policy aims to improve the comprehensive transportation network through government intervention and market guidance. By optimizing the transportation structure, reducing road transportation and increasing railway transportation, more goods are transferred from road transportation to railway, thereby promoting the adjustment of transportation structure, to achieve the goal of green sustainable development and a strong transportation country. Promoting the implementation of the “Railway Transfer” policy is actually related to the implementation of the structural reforms on the supply side of transportation, and is an important guarantee for the sustained and healthy development of my country’s economy.
The Current Situation and Development Suggestion of Highway Instrument and Equipment Measurement Management
Authors: Lu Liu , Heng Qiao , Guangwu Dou
Published: June 2021

The application of automation and intelligent technology in highway instrumentation equipment has gradually become the main factor that affects highway engineering test results. This article summarizes the characteristics of highway instrument and equipment measurement, and analyzes the main problems existing in the current highway professional measurement work from two aspects: measurement service and measurement submission. Suggestions for the development of highway professional metrology in response to the above problems. These suggestions include improving the legal system, exerting the strength of industry technical organizations, striving for more measurement authorizations, improving technical levels, and strengthening talent training.
Research and Application of a New Encryption Transmission Technology of Internet of Things Based on PLC Power Line Carrier Communication
Authors: Lingzhi Pan , Yizhu Zhang , Di Zhao , Jianguang Wang , Limin Deng , Lingwen Sun
Published: June 2021

Information transmission is an important part of the Internet of things. At present, the different devices produced by IOT (Internet of things) manufacturers give rise to the various connection modes, such as infrared, Wi-Fi, network cable, Bluetooth, ZigBee, VB IOT, Lora and LTE, making the market in chaos. In view of the above situation, this paper proposed a new way of IOT communication by using PLC power line carrier for encrypted transmission. It covered the IOT network to all power supply terminals by using wires in the unit of the area. In this way, the IOT devices can be powered, solving the problem of the last kilometer of network signal transmission.
Discussion on the Citation of Accelerator Standards and Testing Methods
Authors: Xiaolong Chen , Zhenxing Li , Benqing Gu , Zhitang Li , Zeqin Li , Kaihong Zhong
Published: June 2021

As several standards are available for the accelerator test, the influence of different standards on accelerator test result was studied. Results showed that cement components and cement type had a significant effect on the accelerator test results. In addition, the impact of different batches of benchmark cement and w/c ratio on accelerator test results was investigated. Moreover, reasons of benchmark cement affected the test results of accelerator was analyzed. Standards for accelerator testing and principles of selection of standards were also discussed in this paper.