bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Crack Resistance of Semi-flexible Pavement Materials
Authors: Jiahong Wu
Published: April 2021

Semi-flexible pavement has been widely used in China's road construction due to its excellent rutting resistance. Due to the large difference in volume stability between the matrix asphalt mixture and the cement mortar, the internal stress of the semi-flexible pavement material is concentrated and cracking is likely to occur. To explore the influence of different Influencing factors on the cracking resistance of semi-flexible pavement materials. This paper used the orthogonal design method to design the mix ratio of ordinary cement mortar. On this basis, admixtures (silica fume, ordinary emulsified asphalt, water-based epoxy resin) were added to prepare special cement mortar. Then, using cement mortar type, matrix porosity, matrix asphalt type, matrix aggregate type as the influencing factors, this article has studied his influence on the crack resistance of semi-flexible pavement materials. Tests show that cement mortar type, matrix porosity, matrix asphalt type, matrix aggregate type have varying degrees of influence on the crack resistance of semi-flexible pavement. The effect of matrix porosity on low temperature crack resistance is the greatest, followed by asphalt and cement mortar types, and the lowest by aggregate type. Enhancing the flexibility of cement mortar and enhancing the elastoplasticity of the matrix are conducive to improving the low-temperature performance of semi-flexible pavements.
Effect of heat pipe failure on performance of residual heatremoval system with heat pipe for small lead-based reactor
Authors: Hu Chongju , Wang Hongyan , Wu Bo , Zhang Xiuxiang , Zhang Pinghua
Published: April 2021

Heat pipe have the characteristics of high thermal conductivity, high safety performance, without external power, etc. In this paper, The numerical simulation CFD software FLUENT is used to study the thermal-hydraulic characteristics performance of heat pipe waste heat removal system with heat pipe for lead-based reactor under normal conditions and Station-Black-Out (SBO) with partial heat pipes damage respectively. Results showed that heat pipes promote heat transfer in the reactor and reduced the temperature of the fluid around the reactor during normal operation; Heat in the core could be removed smoothly by the PRHRS during SBO accident without heat pipe damage ; and when the proportion of failed heat pipes is less than 50% during SBO accident , the PRHRS could still ensure safe operation of the reactor and the distribution of failed heat pipes in the reactor results the core temperature variation by less than 5 K.
Hysteresis Properties of Corroded High Strength Steel
Authors: Wang Hong
Published: April 2021

In order to study the effects of corrosion damage on the hysteresis properties of high strength steel (HSS), dry-wet cycle corrosion tests were conducted on Q690D steel to obtain 6 batches of corroded specimens, and cyclic loading tests were performed on them to analyse the degradation law of hysteresis curve, skeleton curve and hysteretic energy, and then establish the hysteresis constitutive model of corroded HSS steel. Results indicated that although the hysteresis curves of corroded specimens are still smooth and full, corrosion damage would result in the continuous decrease of peak stress, and lead to the linear reduction of hysteresis energy. Besides, the cyclic hardening coefficient K’ and cyclic hardening index n’ of HSS would also decrease linearly with corrosion degree. Based on these experimental results, a new hysteresis constitutive model for corroded HSS steel was proposed, and its validity was verified.
Environmental efficiency measurement based on DEA Malmquist model: a case study of Henan Province
Authors: Zhang Zijing
Published: April 2021

Based on the panel data of different cities in Henan Province from 2010 to 2016, DEA model with variable scale compensation and Malmquist index model are used to measure environmental efficiency from static and dynamic perspectives. The results show that the overall environmental efficiency of Henan Province is at a high level, the technical efficiency is slightly improved, the allocation of input factors tends to be reasonable; the environmental efficiency is rising in dynamic change, among which the influence of technological progress on the environmental efficiency of Henan Province is more critical.
Study on dynamic modulus of asphalt mixture in cold regionunder rotary accelerated loading
Authors: Zhu Li , Li Jin , Yu Miaozhang , Dong Di , Cui Xinzhuang
Published: April 2021

In order to study the evolution law of mechanical properties of asphalt pavement mixture in cold regions under long-term load, the rotary accelerated loading equipment was used to carry out a total of 500,000 accelerated loading tests on the full-scale pavement, and the dynamic modulus test of the mixture before and after wheel load was carried out respectively. The master curve of dynamic modulus and dynamic modulus ratio (dynamic modulus value after wheel load / dynamic modulus value before wheel load) of the mixture at -20ºC were established to predict the long-term mechanical response of the mixture at low temperature. The results show that: low-frequency (or high temperature) has a more significant effect on the viscoelastic properties of the asphalt mixture. In the conversion frequency range of 1.6×10–3~1.6×102 Hz, the dynamic modulus ratio decreases with the increase of frequency, and the maximum ratio is 0.62 when the frequency is 1.6×10–3 Hz, which indicates that the high frequency (low temperature) has little effect on the performance of asphalt mixture. This study can be used as a theoretical reference for the structural design and performance optimization of asphalt pavement in cold regions.
Analysis of elastic viscoplastic consolidation of sand drain foundations with exponential seepages
Authors: Yang Duanyang , Li Fengyuan , Xia Yangyang , Shi Mingsheng , Hao Yanjie , Liu Qi
Published: April 2021

Studies have shown that the pore seepage in soft clay deviates from Darcy's law, with the compressibility and permeability of the soil demonstrating obvious nonlinear characteristics during the consolidation process. These factors will affect the sand drain foundation consolidation process. In order to explore the consolidation mechanism of sand drain foundation in saturated clay, this paper introduces the UH model considering the time effect to describe the nonlinear deformation relation of the soil skeleton under the Barron free strain assumption and introduces the exponential seepage equation as an alternative to Darcy's law. Additionally, the impact of the permeability coefficient and the smearing effect is considered which is used to re-derive the conventional sand drain consolidation equation, and then the finite difference method is adopted to give the implicit numerical solutions of the equation. By comparing with literature results, the validity of the method developed in this paper is verified. Then, the effects of the soil nonlinearity, construction disturbance, and external load on the sand drain foundation nonlinear consolidation process are studied as a function of time. The current results reveal that due to the viscous effect of soil, the pore pressure near the undrained boundary of the sand drain foundation during the pre-loading period increases. The above phenomenon is more evident when considering the non-Darcy seepage; meanwhile, the consolidation rate of the sand drain foundation also becomes increasingly slow. Moreover, the decrease of the permeability coefficient in the smear zone can significantly reduce the dissipation rate of the overall pore pressure of the sand drain foundation, while the increase of the external load accelerates foundation consolidation.
Research Progress of Locally Resonance Acoustic Metamaterials
Authors: Zhehua Du
Published: April 2021

Bragg scattering phonon crystal and locally resonant acoustic metamaterials were introduced. In order to generate noise reduction, the lattice constant of Bragg scattering phonon crystal should be of the same order of magnitude as the wave length of the sound wave, therefore, its application field is limited. Locally resonant acoustic metamaterials consume sound energy by coupling its own resonant frequencies with those of sound waves at close range. Its size is two orders of magnitude smaller than the wavelength of sound wave; thus, the control of low-frequency noise by small-size acoustic metamaterials is realized. Locally resonant acoustic metamaterials have some extraordinary physical characteristic in the conventional medium for their special acoustic structural units, such as negative refraction and negative mass density. Especially in low frequency band, they have acoustic forbidden band in which the sound wave transmission is prohibited. Acoustic structural unit having resonant characteristics has been developed. Surface-mounted resonant element plate structures and thin film acoustic metamaterials are the normal types of locally resonant acoustic metamaterials. Their research and development provide a new method for low-frequency noise control.
Study on the Content and Influence of Heavy Metal Elements in Dust of Xiqing District of Tianjin
Authors: Yin YanShan , Xu Jin
Published: April 2021

At present, heavy metal elements in dust have great influence on air quality and human health,therefore, the content and influence of heavy metal elements on campus were studied. Firstly, PM10 and total dust in the autumn campus atmosphere were sampled for 10 consecutive days, and then digested by electric heating plate digestion method. Then, inductively coupled plasma emission spectrometer (ICP-OES) was used to detect and analyze the content and concentration ratio of seven heavy metal elements Cu, Pb, Cd, Zn, Cr, Hg and Ba in PM10 and total dust. Finally, through comparative analysis, it is concluded that heavy metal pollutants in the atmospheric environment are mainly Zn and Ba, and the concentrations of Cd, Zn and Ba are seriously exceeded, so the air quality in Xiqing District of Tianjin is poor, and the particle size distribution of Cd and Hg makes it easy to enter the human body, which is especially unfavorable to human health.
Bibliometric Analysis of Rural Environmental Governance Research (1957–2020)
Authors: Shen Qian
Published: April 2021

Rural environmental governance is a problem that all countries in the world will face in the process of development. The research on the related literature of Rural environmental governance is helpful to provide reference for practical work. This study uses the Aminer big data analysis platform to analyse relevant research literature on the theme of “Rural environmental governance” from 1957 to 2020. The three research perspectives are: research trends, distribution of academic achievements, and scientific research cooperation networks. The analysis results provide an overall description and judgment of the international Rural environmental governance research.
Research Progress of Low Temperature Plasma Technology to Treat Sulfur-containing Malodorous Gas
Authors: Zhehua Du
Published: April 2021

This paper briefly discusses the source, harm and removal methods of sulfur-containing malodorous gas. At this stage, the main methods for treating sulphur-containing malodorous gases are physical, chemical and biological methods. In contrast, low temperature plasma technology combines the advantages of physical, chemical and biological methods, and can effectively overcome the disadvantages of traditional processes. Through the comparison of various methods, the advantages of low temperature plasma treatment of sulfur-containing malodorous gas are summarized, and the corresponding removal mechanism is proposed. The treatment progress and existing problems of using low-temperature plasma to remove sulfur-containing malodorous gas, especially hydrogen sulfide, carbon disulfide, methyl sulfide, methyl mercaptan and dimethyl disulfide, are comprehensively discussed. A new idea for the simultaneous removal of multi-component sulfur-containing malodorous gas by low temperature plasma is proposed. Compared with traditional methods, low temperature plasma technology has the advantages of simple process, strong applicability, easy operation, and low energy consumption in processing sulfur-containing malodorous gases. The treatment of sulfur-containing malodorous gas by low-temperature plasma technology needs further research.
Analysis on improving strategy of lithium thionyl chloride battery used for landmine fuze based on SWOT-AHP method
Authors: Wang Xiao , Wang Xin , Zhang Nan , Niu Tengran
Published: April 2021

As the landmine is now always detonated by electronic fuzes which are usually powered by the battery inside landmines. As a weapon, landmines are required to be reliable during long service time and the performance of the battery is essential to the operation effectiveness of the landmines. This paper analyzes qualitatively the main factors which have effects on the improving strategic choice of lithium thionyl chloride battery which is used for fuzes of certain landmine weapon to power up based on SWOT-AHP method. The strengths, weaknesses, opportunities and threats of the battery are analyzed and the weights of each factor are calculated and sorted by analytic hierarchy process (AHP) method. The result shows that the SO development strategy should be taken. The study provides direct and feasible improving method of landmine fuzes use lithium thionyl chloride battery.
Research on Performance of Automotive Air Conditioning Filter
Authors: Liu Shurong
Published: April 2021

Explains the main sources and types of air pollutants in automobiles, and introduces methods to evaluate the effect of automobile air filters on the purification of the above-mentioned automobile air pollutants, and the purification effects of existing automobile air filter products on the market Evaluate and discuss its purification level to provide a theoretical basis for the future formulation of relevant specifications.
Experimental analysis on heat transfer performance of LED lighting radiator
Authors: Shang Fumin , Liu Chaoyue , Wang Yang , Yang Kangzhe , Liu Jianhong
Published: April 2021

At present, LED lighting is gradually replacing the traditional lighting and becoming the fourth generation of light source. In the process of LED lighting, a large part of electric energy is converted into heat energy. If it can not dissipate heat in time, the device efficiency will be reduced or even damaged. Therefore, the heat dissipation problem of LED needs to be solved. By testing and recording the working temperature of the existing LED lighting radiator in different positions, the performance of the radiator was compared and tested. The experiment shows that the radiator works best when the light source is downward, and the temperature difference between the top and the bottom of the radiator is the smallest in this case, and the temperature at the top of the radiator is higher than that at the bottom in the working process. When the position of the LED lighting radiator changes, the heat dissipation performance of the top and bottom of the radiator changes.
Analysis of vibration signal of diamond roller grinding
Authors: Liu Yong , Fu TingBin , Zhao HuaDong , Zhu ZhenWei
Published: April 2021

According to the non-linear and non-stationary characteristics of the vibration signal in the roller grinding manufacturing process, the background signals, namely the vibration signal when the grinder is idling and the vibration signal during contact grinding, are collected separately, and the signal is decomposed into multiple by the method of CEEMDAN modal decomposition. Then several components are removed by correlation analysis. Finally, the signal is denoised and analyzed by wavelet threshold denoising, which lays the foundation for the digital and intelligent grinding of diamond rollers by curve grinders. The results show that most of the grinding noise is in the low frequency, which is mainly caused by the internal friction of the machine tool; the frequency of the grinding vibration signal is mainly distributed around the two frequencies of 250hz and 350hz.
Analysis of overcharging characteristics of a new type lithium iron phosphate battery for dc system of substation
Authors: Meijie Liu , Kai Gao , Zhongwei Li , Peng Qiu , Zhen Meng
Published: April 2021

In recent years, the number of DC power system in substation has been increasing. And the technical transformation of DC power system, fault maintenance and other workload is also on the rise, therefore dc emergency power emerged. The lead-acid battery is usually adopted for traditional DC emergency power supply. The disadvantage of lead-acid battery in volume and quality makes it difficult to realize the portability and mobility of dc emergency power. Lithium iron phosphate battery technology is the frontier technology in the rapid development period. However, the characteristics are not studied clearly. This paper studies the characteristics of lithium iron phosphate battery in different ambient temperature, operating conditions, and current of charge and discharge, analyses and summarizes the characteristics of battery charge and discharge, so as to improve the maintenance of station DC power supply system and the reliability of power supply network.
Improvement strategy of overcharging characteristics of a new type lithium iron phosphate battery in substation
Authors: Kai Wei , yunsong Liu , Hua Rong , Peng Qiu , Zhen Meng
Published: April 2021

In order to solve the hidden trouble for the long-term overcharging condition of lithium iron phosphate batteries, it is urgent to develop overcharging protective lithium iron phosphate batteries. A strategy combining autonomous equalization technology and passive equalization technology is proposed in this paper to improve the overcharging characteristics of lithium iron phosphate batteries. A certain proportion of oxidizing reductant is added to the electrolyte of ordinary lithium iron phosphate battery. And a comparative test is conducted between conventional lithium iron phosphate battery module and self-equalization lithium iron phosphate battery module in continuous overcharging state. The test results show that the proposed comprehensive strategy has reduced the voltage difference between the cells significantly, and the single cell voltage difference is small in the long-term overcharging process, so as to maintain the safe voltage level.
Case study on diagnosis and identify the degree of bottom hole liquid accumulation in double-branch horizontal wells in PCOC
Authors: Yao Tingwei , Zhang Yang , Guo Minhao , Tuo Zhilin , Wang Haiyang , Zhou Desheng
Published: April 2021

In the process of continuous production of natural gas wells, formation pressure and gas flow rate decrease continuously. The ability to carry liquid decreases continuously, thus gradually forming bottom hole liquid. Bottom hole liquid accumulation is an important reason for the decrease of production or shutdown of natural gas wells. How to diagnose whether there is liquid accumulation in natural gas wells and identify the degree of liquid accumulation, to adopt drainage gas recovery operation in time, is the research focus of efficient development of natural gas reservoirs. In this paper, a method for diagnosing bottom hole liquid accumulation combining production performance curve and modified Fernando inclined well critical liquid-carrying model is designed for a large scale double-branch horizontal well used in unconventional reservoirs. The method is applied to the Well X2 of He 8 Member in PCOC. The application results showed that there was no liquid accumulation in the horizontal and vertical sections of the Well X2. The liquid in the wellbore was generated at the bottom of the inclined section and the liquid accumulation is upward along the wellbore from the bottom of the inclined section, with the height of 3 m.
Examples of discriminating the downward depth and downward timing of the velocity string in the water-producing gas well
Authors: Yang Jing , Guo Minhao , Le Yan , Fan Xin , Wang Haiyang , Zhou Desheng
Published: April 2021

The problem of bottom hole effusion is an important reason for the reduction and even shutdown of natural gas wells. Downward velocity string is an important drainage gas recovery process, which can improve the flow rate of gas and discharge more liquid from the wellhead. However, the depth and timing of the velocity string is a technical problem that has been difficult to solve by field engineers. To solve this problem, this paper designs a method to select the depth and timing of the velocity string in the case of highly deviated wells and applies this method to Well X6–2 and Well X2–1 of PCOC in Ordos Basin, China. The optimization results show that when the wellhead pressure is 6.26 MPa, Well X6–2 should lower the 2–1.71 in. or 2.375–1.995 in. velocity string to 3337.9 m before the formation pressure decays to 8.800 MPa, which is most conducive to improve the liquid carrying capacity of gas wells. When the wellhead pressure is 4 MPa, Well X2–1 should lower 2–1.71in. velocity string to 3401.3 m before the formation pressure decays to 5.800 MPa, or lower 2.375–1.995 in. velocity string to 3401.3 m before the formation pressure decays to 5.900 MPa.
Design of Trimming Fixture for Composite Parts
Authors: Yu Feng
Published: April 2021

The unique properties of advanced composite materials make it an ideal material for aircraft manufacturing. The processing research of composite materials has received extensive attention at home and abroad. The structure and shape of typical rib parts are analyzed, and a trimming fixture is designed to ensure that it can be applied to parts of different specifications, while ensuring easy use, making the fixture universal, convenient and economical.
Method for detecting vertical offset of coupling coil using signal coil based on magnetic coupling resonance wireless power transfer system
Authors: Zhaohong Ye , Yuan Gao
Published: April 2021

To improve the reliability in wireless power transfer system, communication is widely used. An independent coil as the signal coil for data transfer has the advantage of decoupling power coupling mechanism and signal coil when designing the system. Besides, in some application, vertical offset of the power coil may impact the stability of the system, position detection of the receiver side power coil is needed. Method of using the signal coil for vertical offset detection is adopted in this paper, simulation result verified the feasibility. The vertical offset of the power coil can be estimated by an exponential function based on the system parameter and the current of the primary side power coil. The exponential fitting function used in the paper can be used as a reference when designing the detection.
Analysis and study on an intelligent auxiliary control system for car comity pedestrians
Authors: Yang Hongtu , Zhang Hongdang , Zhang Fengjiao , Xin Debao , Chen Jinyu
Published: April 2021

An automobile intelligent auxiliary control system performance for comity pedestrians is analysed. For safety reasons, a car safety distance model which can distinguish pedestrians at the front zebra crossing line is proposed. The important features of the active protective comity pedestrian integrated control system are derived, which can accurately identify pedestrians or cyclists in front of you and distinguish safety behaviour characteristics. According to the system feedback, active protection measures are adopted. A control system based on the combination of infrared radar probe ranging system and image processing recognition system is studied. The innovative research on car avoiding pedestrians focuses on both the behaviour characteristics of the driver and the pedestrian. Dual protection of longitudinal anti-collision comity pedestrians and horizontal pedestrian protection early warning protection can be carried out through the system. The intelligent auxiliary control system is a control system that can ensure the safety of pedestrians at non-traffic signal intersections. The system embodies more intelligent and humane, and also provides innovative ideas for the research and development of new products.
Research of flat plate solar air collector in drying
Authors: Xi Qiao , Long Weifan , Ma Qingsong
Published: April 2021

Solar drying technology has been widely used in engineering fields such us chemical drying because of its low cost and low pollution advantages. In this review, the structural forms, materials and coatings of the heat-absorbing panels of flat plate solar air collector are classified, and the experimental and theoretical results of the performance level of the solar air flat panel collector are summarized. In indoor tests, the energy efficiency of flat plate solar air collector is 30% to 79%, and the energy efficiency of flat plate solar air collector in drying applications is 28% to 62%.
Air curtain based on coupling of air source heat pump and electric heating
Authors: Hongwen Jin , Bingqi song , Hengqin Gong
Published: April 2021

Air curtain is a widely used heat insulation equipment in the market, which reduces the heat exchange efficiency of both sides by the air surface formed by jet. In order to reduce the use of electric heating device in air curtain, a new air curtain is designed by the coupling experiment of air source heat pump and electric heating. The air curtain fan is preheated by the condenser of air source heat pump, so as to reduce the dependence of air curtain on electric heating parts, and save energy consumption.
Study on the Influence Path of Sustainable Development of Green Building in Tianjin
Authors: Wang Yihong , Li Yaxuan
Published: April 2021

This paper uses the qualitative comparative analysis method to define the conditional variables and the outcome variables of the impact path of the sustainable development of green buildings in Tianjin. Secondly, the paper analyzes the relationship between the conditional variables and the outcome variables to pave the way for the subsequent suggestions on the sustainable development of green buildings. Finally, by assigning values to the cases, the truth table of the impact path of sustainable development of green buildings is generated, the impact path is established, and the impact path is analyzed through the three aspects of the government, technology and enterprises.
Research on driving factors of China’s carbon emissions based on structural decomposition
Authors: Gao Hua , Huang Zhoujie
Published: April 2021

After further processing the input-output tables of 2007, 2012 and 2017, the carbon emissions are decomposed into four driving factors: energy intensity effect, Leontief technology effect, final demand structure effect and final total demand effect through IO-SDA model. The results show that the energy intensity effect has a significant negative effect, which is the main factor to promote the reduction of carbon emissions. The Leontief technical effect and the final total demand effect are positive effects, and the total final demand effect is the main factor leading to the increase in carbon emissions, and the effect of the final demand structure effect is not significant. In addition, the results of the influence coefficient and the inductance coefficient show that: metal smelting and rolling manufacturing, petroleum processing and coking and nuclear fuel processing, coal mining and processing, and oil and gas mining and processing industries are high-energy-consuming industries, but the status of the basic industry makes it possible to formulate energy-saving policies only in terms of technological progress.
The Analysis of Business Scenarios and Implementation Path of “5G+Source-network-load-storage ”multi-station integration
Authors: Siwu Li , Sichang Xiao , Fangmei Bie , Yulin Yan , Xiaodi Ma , Chan Pan
Published: April 2021

With the gradual implementation of the country’s “new infrastructure” strategy, the market demand for infrastructure in strategic emerging industries such as 5G, data centers and electric vehicle charging has become more intense. The multi-station integration business that carried out by power grid companies can effectively meet market demand, avoid the repeated construction and investment problems of state-owned assets, and reduce the cost of operators, Internet enterprises and other customers of infrastructure construction. Combined with the current market demand and the development trend of emerging industries, this paper puts forward the concept of “5G-source network-load storage” multi-station integration which mainly focusing on digital services and energy services, studies the commercial application scenarios of “5G-source network-load storage” multi-station integration, analyzes its implementation optimization path, and provides a reference for power grid companies to accelerate multi-station integration business.
Research on Strategies of Low-Carbon City Planning and Construction
Authors: Zhang Min
Published: April 2021

With the continuous development of China's economy, the policy of sustainable development has increasingly become the leading direction of urban planning and construction at all levels, and the concept of low-carbon city construction continues to emerge. In the process of low-carbon city construction, it is required to start from reducing carbon emissions, uphold the five concepts of innovation, coordination, greenness, openness, and sharing, explore low-carbon eco-city planning strategies and methods, and make urban planning become the local government's emission reduction measures an important means to make the city’s low-carbon development more smoothly and realize the sustainable development of low-carbon cities.
Power Internet of Things card and infrastructure resources security supervision business model and platform construction under the background of energy Internet
Authors: Ben Wang , Qing Zhao
Published: April 2021

In response to the national call to strengthen the construction of new infrastructure, State Grid Corporation takes the acceleration of new digital infrastructure as an important basis for transformation and upgrading and the realization of strategic objectives. With the surge in the number of power Internet of Things terminals and the demand for data processing, the development of Internet of Things card and infrastructure resource operation business has become the focus of the industry. This paper investigates and clarifies the business background, business positioning and research theory of the business platform, explains the basic framework, basic functions and implementation plan of the platform construction, and analyzes the market status quo and business model of the platform operation. This paper provides theoretical basis and case reference for the new digital infrastructure construction of State Grid Corporation, and has certain theoretical inspiration and practical significance for the construction of mutually beneficial, sharing and co-construction energy Internet ecology.
Research on Carbon Emission Scale and Influencing Factors of Green Logistics Industry in Jiangsu, Zhejiang and Shanghai
Authors: Zeng Fanxin
Published: April 2021

The Jiangsu, Zhejiang and Shanghai areas are important areas for my country’s economic development. Its logistics industry is showing a trend of great development, but economic development has also caused considerable pressure on the environment. The paper uses the energy coefficient method to estimate the carbon emissions of the logistics industry in Jiangsu, Zhejiang and Shanghai from 2003 to 2016, and quantitatively analyzes the five factors of energy structure, energy efficiency, industrial structure, economic growth and population. The research results show that the energy structure factors and industrial structure factors in the Jiangsu, Zhejiang and Shanghai regions have a restraining effect on the increase in carbon emissions of the logistics industry, while energy efficiency factors, demographic factors and economic growth factors have an effect on the carbon emissions of the logistics industry. The increase in emissions has a boosting effect. Finally, from the aspects of improving energy efficiency, energy structure, industrial structure, etc., it puts forward specific suggestions and countermeasures for the development of green logistics in Jiangsu, Zhejiang and Shanghai.
A Middle School Campus Case Analysis with Dynamic Post-evaluation Strategy of Space Syntax
Authors: Guo Kexin , Pang Jining , Peng Guoqing , Qu Xuan , Pang Chunmei , Wan Qian
Published: April 2021

Due to the lack of technology, the post-evaluation system of spatial syntax has the limitations of inexperience, 3D vision and spatial problems prediction. The paper focuses on: (1) combined with the layout evaluation case of Nanning No.2 Middle School, the application of dynamic post-evaluation system in the evaluation process is refined, and the rationality of the system is verified; (2) combined with sDNA and GIS, a isovist model is built to expand the spatial syntax in 3D; (3) the simulation model is integrated into the post-evaluation system to solve the problem of dynamic feedback space, which enriches the dynamic post-evaluation system and improves the efficiency of campus layout.
Research on the application of VIKOR based on fuzzy comprehensive evaluation model in industrial enterprises
Authors: Na Liu
Published: April 2021

In this paper, through the innovative use of the AHP entropy coupling weight method to determine the index weight, the evaluation results of industrial enterprises (taking coal mine as an example) are divided into three world-class levels domestic advanced, and domestic general, and then the index regions of each evaluation index corresponding to the evaluation level are divided. On this basis, VIKOR fuzzy comprehensive evaluation is selected to carry out empirical research in industrial enterprises, and finally, the effective evaluation of industrial enterprises is realized, aiming at improving the production efficiency of industrial enterprises in view of the shortboard.
Research on the Evolution of Collusion between Government and Civil Construction Enterprises in Environmental Regulation
Authors: Yingying Cao
Published: April 2021

Polluting civil construction enterprises usually use the way of "voting with their feet" to exert influence on the efforts of local government's environmental regulation, promote the formation of collusion between government and enterprises, and make the local government relax the supervision on the emission behavior of civil construction enterprises. Based on the Tibert model, this paper uses the evolutionary game method to study the collusion between government and enterprises in the cross regional migration of civil construction enterprises and its prevention. The results show that: when the civil construction enterprises comply with the production, the local government's optimal strategy is non collusion strategy; similarly, when the local government is not willing to collude, the non-collusion choice of civil construction enterprises will get higher benefits than collusion. In addition, the cost of civil construction enterprises transferring between different regions, the loss caused by the collusion between civil construction enterprises and local governments, and the probability of local government violations being found can effectively prevent the collusion between local governments and civil construction enterprises.
A research on early warning method of Distribution Network Cyber Physical System
Authors: Chen Feng , Wei Xu Wei , Heng Wang Zong , Yang Tao , Yang Huang Hong
Published: April 2021

The high integration of cyber and physics is the development trend of intelligent distribution network in the future, but the cyber system not only supports the stable operation of the physical system, also brings some security risks to the cyber physical system of distribution network. Aiming at the requirements of real-time, accuracy, efficiency and other characteristics of distribution network monitoring, this paper proposes an early warning method of distribution network cyber physical system based on Hidden Markov model. Firstly, the online monitoring and early warning system architecture of distribution network information physical system is proposed, and then the early warning method of distribution network cyber physical system based on Hidden Markov model is established. Finally, an example is given to verify that the proposed strategy can accurately and efficiently early warn the fault.
Research on risk assessment method of distribution network based on information physical fusion
Authors: Xu Wei Wei , Chen Feng , Zhang Bao , Huang Jun Hao , Yang Tao
Published: April 2021

With the improvement of information level, the information attack will cross the boundary of power grid information space and cause the disturbance of power grid physical system, which will form a cross-space chain fault and affect the safe operation of power grid. Based on this, this paper proposes a distribution network node risk assessment method based on information physical fusion. Firstly, the overall structure of the distribution network and the information physical coupling characteristics of the information physical fusion are studied. Then, the cross-space chain failure scenario of distribution network with information physical fusion is analyzed. Based on this, the risk assessment method is proposed. Finally, the effectiveness of the method is verified by a numerical example.
Finite Element Analysis of an Ammunition Bracket
Authors: Ma Gaoqiang , Zhou Jiacheng
Published: April 2021

In this paper, a certain type of ammunition bracket was studied, the stress distribution under working load is calculated by static analysis and display dynamic analysis, the stress distribution result show that the maximum load during the working cycle is the instantaneous impact force. Through ANSYS software, Goodman theory method was used to modify the stress, the fatigue life of the bracket and the safety factor of each position of the bracket are calculated. It can provide for life prediction and reliability research of the projectile support.
Research on mechanical-hydraulic system simulation method for multi-control multiway valve
Authors: Xiao Naixin , Xu Lei , Zhang Li-ping , Li Da-shuang
Published: April 2021

Based on the control principle and flow distribution characteristics of the electro-hydraulic proportional load-sensitive multiway valve in an excavator, a system simulation model is established in AMEsim. After proving the accuracy of this model by comparing simulation results with theoretical results for various flow distribution characteristics under saturated and unsaturated conditions, this model is used to study the effect of three-way valve preload on the multiway valve system to prove that the simulation method can evaluate the influence of design parameters on the multiway valve system and then guide the design of multiway valves.
Research on Influencing Factors of Green Innovation of New Energy Vehicles Based on Bayesian Networks
Authors: Li JiaHui , Liu Qin , Ge YingXi
Published: April 2021

This article analyzes the four quasi-measurement levels including industrial development, and collects various data such as government policies, fiscal data, and company patents. This paper analyzes the implementation process of policies, explores the research factors of enterprise innovation ability, and obtains 11 indicators. Based on the Bayesian network constructed with 11 indicators, we use linear regression methods to explore the influencing factors of the green innovation capability of new energy automobile companies, and quantify the degree of influence of each factor. Based on the quantitative results, this paper provides suggestions for government industrial strategic planning, taxation policies, government procurement, etc., and provides a reference for the development of new energy automobile enterprises' industry and technology.
Research on Marine DAB bidirectional DC converter based on DPS
Authors: Li Chang , Tang Xujing , Zhang Zhongze , Yuan Yupeng
Published: April 2021

This paper takes the application of bidirectional DC-DC converter in Marine hybrid power system as the background, the problems of high reflow power and current stress in dual active bridge converter under traditional phase shift control are studied in this paper. Based on the dual phase shift control strategy, the power transmission optimization algorithm model is analyzed and derived, and a control method for optimizing mode switching is proposed. The optimized control algorithm is validated by Matlab/Simulink simulation experiment. The results show that the reflow power and current stress optimization control algorithm can effectively reduce the reflow power and the current stress of the converter, so as to improve the operation performance of DAB converter in high-power ship hybrid power system.
Research on Earthwork Calculation Based on TIN Model
Authors: Yongxiao Wen , Xitun Yuan , Xiongfei Yang , Hang Zhang , Qi Han
Published: April 2021

In actual engineering construction, the calculation of earthwork directly affects the cost budget of the project and the selection of the optimal plan. Therefore, the calculation accuracy and efficiency of the earthwork are very important. This article introduces the construction principle of the TIN model. Based on the TIN model, the earthwork calculation is carried out by the triangular prism method. The data of a fill-excavation balance project in a rugged mountainous area is selected, and under different conditions, the TIN network method and the square grid method are used to calculate the earthwork, and the results are compared and analyzed with accuracy. Estimate. After comparative analysis, it is found that the earthwork calculation using the TIN network method is simple and cheap, and the calculation result is more accurate. It is better than the traditional square grid method as a whole, and can be used in the actual engineering earthwork calculation.
Optimization and Application of Support Scheme for Tunnel with High In-situ Stress in Ningchan
Authors: Xueqiang Zhang
Published: April 2021

Based on the national highway 569 Mandala Datong highway Ningchan tunnel, the study on the optimization design of high ground stress tunnel support parameters is carried out. The results show that the single-layer primary support with I20b as the main support framework cannot control the large deformation of high ground stress tunnel, mainly manifested as arch frame failure and concrete spalling; adopting “double-layer initial support” can control large deformation to a certain extent; increasing the stiffness of inner layer support can reduce the “double-layer” to a certain extent The results show that the cumulative deformation of “support”, but cannot significantly shorten the deformation stability period; appropriately increasing the reserved deformation between the inner and outer layers of the initial support has the best supporting effect, the cumulative deformation is small, and the deformation stability period is shortened. The research results provide a basis for similar high stress tunnel support measures.
Research on the collection and distribution system of Qinhuangdao Port
Authors: Lu Lipeng
Published: April 2021

As a big coal port, Qinhuangdao port is an important shipping hub for coastal shipping because of its superior geographical location. Nowadays, with the growth of the throughput of Qinhuangdao port, it not only puts forward higher requirements for the port infrastructure construction, but also brings greater pressure to the port collection and distribution system. Therefore, it is of practical significance to study the collection and distribution system of Qinhuangdao port to promote the further development of the port. This paper first expounds the relevant theories of the port collection and distribution system, on this theoretical basis, mainly analyzes the current situation of Qinhuangdao port collection and distribution system, and puts forward corresponding countermeasures and suggestions according to the existing problems of the collection and distribution system, so as to accelerate the development of the port and improve the competitiveness of the port.
Application of Green Building Materials in Civil Engineering Construction
Authors: Jia-yao Zhou
Published: April 2021

The continuous economic and social progress of our country has helped the rapid progress of civil engineering projects. However, the relatively improved civil engineering project creation also has many shortcomings, such as waste of resources, depletion, and pollution of the natural environment. The construction project itself is an item. The energy consumption is relatively high. Due to the shortage of resources and the more serious natural environment and ecological problems, the public pays more attention to the related problems of their own quality of life, and more and more people are adopting green building materials. Therefore, it is very important to explore the application of green building materials in civil engineering projects.
Study on failure law of rock mass and slope stability by open-pit combined mining
Authors: Shaojie Feng , Chen Gao , Wenbo Liu
Published: April 2021

With the continuous downward mining, more and more attention has been paid to the problem of slope stability under open-pit combined mining. Taking Zijinshan gold and copper mining as an example, the failure properties of overlying rock mass and slope stability under open-pit combined mining under different mining methods are studied by numerical simulation method, and the failure law of overlying rock mass is proposed. Combined with the geological structure distribution of 5-5 section and the influence of different mining stages, the slope stability is evaluated by slip field theory. Relevant reinforcement measures are proposed.
Seismic analysis of Kunshan Xintiandi super high-rise residential building
Authors: Zhang Xiaomeng , Liu Wenting , ren Qingying , Zhou Yilun , Liu Ziao , yang Xiao
Published: April 2021

The Kunshan urban investment project includes 1 office tower, 4 high-rise residential buildings and 1 high-rise commercial building.Each monomer shares a large basement chassis, a total of three basement floors.This design is the second phase (4# residence and corresponding basement).The height of the structure is more than 90 meters, and it is a shear wall structure system. The selection and structure of the structure system are analyzed, and the mechanical performance of the structure is verified through calculation and analysis.
Construction and Implementation of Standard System for Rural Household Toilets in China
Authors: Xiaolei Ma , zhenyu Yun , Yaoping Ding , yanlong Zhang , yutong Wang , liangbing Hu
Published: April 2021

Promoting the "toilet revolution" in rural areas is an important measure to improve the rural living environment and realize rural revitalization. Standardizing the construction and management of rural household toilets by means of standardization is of great significance for the high-quality completion of the "toilet revolution". Based on the policy and current situation of the transformation of rural household toilets in China, this paper studies and analyzes the current situation of standardization of rural household toilets, expounds the construction principles of standard system for rural household toilets, constructs the standard system framework including comprehensive general use, facilities and equipment, construction acceptance, management and protection, and finally puts forward some countermeasures and suggestions to promote the implementation of the standard system.