bluuebunny/crossref_metadata_2025 huggingface dataset:
Evaluation of Urban Ecosystem Service Value under New Urbanization—A Case Study of Chengdu City
Authors: Luo Yi , Liu Shuang , Zhang Cheng , Ning Ruiying , Zhou Jiajin
Published: May 2020

In order to evaluate the change of ecosystem service value in Chengdu, GIS technology was used to obtain the land use type data of Chengdu from 2009 to 2018. The equivalent factor method was used as the core evaluation method, and an ecosystem value evaluation model was established to explore the impact of various land use types on ecosystem service value. The results show that: (1) the trend of land use change is that both the area and the proportion of land use change in different degrees. The area of cultivated land, water area and unused land are greatly reduced, and the area of construction land expands rapidly, mainly through the occupation of cultivated land and unused land. (2) The intensity of land use in Chengdu is greater and continues to increase, and the contribution rate of construction land is larger, which indicates that the land use structure is developing towards the structural direction of mainly construction land. (3) Changes in ecosystem service value are not only related to land use structure, but also to the economic development, willingness to pay and ability of the whole society. (4) Ecosystem service value is negatively correlated with construction land and unused land; it is positively correlated with cultivated land, forest land and grassland. Generally speaking, Chengdu’s land use change has not caused obvious damage to the ecosystem, but the impact of human lifestyle on the environment in the process of economic development cannot be ignored. The growth of construction land area should be appropriately controlled, ecological land should be protected, and the sustainable development of social-economic-ecological benefits should be realized.
Research on the Present Situation of Soil Oil Pollution and Phytoremediation Technology in Northern Shaanxi
Authors: Wei Yang
Published: May 2020

Aiming at the prominent problem of soil oil pollution in northern Shaanxi, this paper comprehensively analyzed the current situation of soil oil pollution in northern Shaanxi, phytoremediation technology for polluted soil, and microbially enhanced phytoremediation technology. The analysis showed that with the continuous expansion of the scale of oil development, the oil pollution in northern Shaanxi is extremely serious, which makes the ecologically fragile areas face a severe test. In response to pollution problems, scholars have carried out extensive research on green remediation technologies such as suitable plants and microbial combined plants, and have accumulated certain research results, which provide technology support for establishing a phytoremediation scientific system suitable for the oil-polluted soil in the local environment of northern Shaanxi.
Technology and Application of Salty Slurry Harmlessness Reduction and Resource Utilization Treatment
Authors: Guihua Zhu , Shanzhen Yi , Haoting Tang , Weize He , Yong Chen
Published: May 2020

Salt slurry is a special sludge produced in the process of brine purification in chlor-alkali industry. In order to eliminate the harm of salty slurry to the environment and realize its economic value, a salty slurry harmlessness, reduction and resource utilization treatment method was proposed. Through this method, salty slurry will be transformed into desulfurizer with its water content and Cl- content reduced to 15% and 0.5% respectively. This method has been applied to projects, bringing environmental and economic benefits.
Hyperspectral image classification based on spectral-spatial kernel principal component analysis network
Authors: Fan Yanguo , Hou Shizhe , Yu Dingfeng
Published: May 2020

Hyperspectral imagery contains both spectral information and spatial relationships among pixels. How to combine spatial information with spectral information effectively has always been a research hotspot of hyperspectral image classification. In this paper, a Spatial-Spectral Kernel Principal Component Analysis Network (SS-KPCANet) was proposed. The network is developed from the original structure of Principal Component Analysis Network. In which PCA is replaced by KPCA to extract more nonlinear features. In addition, the combination of spatial and spectral features also improves the performance of the network. At the end of the network, neighbourhood correction is added to further improve the classification accuracy. Experiments on three datasets show the effectiveness of the proposed method. Comparison with state-of-the-art deep learning-based methods indicate that the proposed method needs less training samples and has better performance.
Application of laser remote sensing technology and super continuous spectrum laser
Authors: Jing Li , Ying Che , Meishan Jin , Yannan Zhai , Changhong Ding
Published: May 2020

Fiber optic super continuous spectrum laser technology is a new technology developed in recent years. It takes into account the advantages of good alignment of laser source, high energy density and wide wavelength range of ordinary white light source, which can not only accurately remote sense distant target, but also obtain hyperspectral information of distant target. Super continuous spectrum of laser radar is a kind of remote sensing monitoring instrument, it can obtain three-dimensional spectral information of the target, and can be accurately detected in the night of distant high spectral information, the all-weather, three-dimensional spectrum detection method with the traditional passive remote sensing compared with single/multiband laser radar technology has incomparable advantages. Based on the development trend of lidar abroad, the development status of super-continuous spectrum lidar in China and the problems in remote sensing detection of oil spill, this paper introduces the feasibility of using super-continuous spectrum laser to monitor oil spill in the sea, which lays a foundation for further research.
Performance evaluation of GPS / BDS combined single-point positioning based on RTKLIB
Authors: Yan-yi Li , Jin Huang , Ming-xiu Tang
Published: May 2020

In order to evaluate the performance of GPS / BDS, RTKLIB, an open-source software of GNSS, is used in this paper. In this paper, the least square method, the weighted least square method and the extended Kalman filter method are respectively applied to BDS / GPS single system for data solution. Then, the BDS system and GPS system are used for fusion positioning and the positioning results of the two systems are compared with that of the single system. Through the comparison of experiments, on the premise of using the extended Kalman filter method for positioning, when the GPS signal is not good, BDS data is introduced for dual-mode positioning, the positioning error in e direction is reduced by 36.97%, the positioning error in U direction is reduced by 22.95%, and the spatial positioning error is reduced by 16.01%, which further reflects the advantages of dual-mode positioning in improving a system robustness and reducing the error.
Research on the Tower Pole Tilt Mechanism and Risk Assessment Technology Based on BeiDou reverse network RTK
Authors: Shen Zhi , Yu Wei , Song Bao , Wang Hongwu , Li Junpeng , Jin Jing , Zhang Yifan , Wang Mingming
Published: May 2020

In order to solve the problems of inaccurate and untimely monitoring and high false alarm rate in the current monitoring of the tower pole tilt attitude, this paper proposes a technology for monitoring the tower pole tilt attitude based on RTK technology of Beidou reverse network. This method uses reverse network RTK differential positioning algorithm, which can improve the positioning accuracy of the low-cost Beidou/GNSS positioning terminal and make the positioning accuracy of the tower pole tilt monitoring reach the millimeter level. In this paper, the tilt attitude information of the transmission line tower is measured and calculated by using the height and position information of the transmission line tower, and then the risk assessment is carried out, so as to control the tilt attitude and assess the risk of the transmission line tower. The actual test results show that the method can obtain the information of the tilt attitude of transmission tower pole accurately and reliably, and can be used to evaluate it, which meets the requirements of intelligent, accurate and digital management.
Tree height inversion combining light detection and ranging and optical remote sensing data
Authors: Wang Kunlin , Ma Yi , Zhou Fangrong
Published: May 2020

Tree barriers in transmission line corridors are an important safety hazard.Scientific prediction of tree height and monitoring tree height changes are essential to solve this hidden danger. In this paper, the advantages of airborne lidar and optical remote sensing data are combined to research the method of tree height inversion. Based on glas data of lidar,waveform parameters such as waveform length, waveform leading edge length and waveform trailing edge length were extracted from waveform data by gaussian decomposition method.Terrain feature parameters were extracted from aster gdem data.The tree crown information was extracted from the optical remote sensing image by means of the mean shift algorithm. Then extract the vegetation index with high correlation with tree height.Finally, the extracted waveform feature parameters, topographic feature parameters, and crown index and vegetation index with high correlation are used as model input variables. The tree height inversion model was established using four regression methods, including multiple linear regression (mlr), support vector machine (svm), random forest (rf), and bp neural network (bpnn). The accuracy evaluation was conducted, and it was concluded that the tree height inversion model based on random forest obtained the best accuracy effect.
Study on the variation of physical and mechanical characteristics under freeze-thaw condition
Authors: Yanzhe Tian
Published: May 2020

Subjected to freeze-thaw cycles, the deformation of physical and mechanical properties is the main cause of engineering disasters. Based on the analysis of the results of triaxial compression test after different freeze-thaw cycles, conclusions are drawn that: under the certain freeze-thaw cycles conditions, with the increase of confining pressure, the triaxial compressive strength, elastic modulus and the axial strain increase gradually, indicating that the failure of rock changes from brittle failure to plastic failure; in the case of same confining pressure, with the increase of the number of freeze-thaw cycles, the triaxial compressive strength,elastic modulus of rock decreases and the axial strain corresponding to peak stress gradually increase. With the increase of the number of freeze-thaw cycles, the cohesion of grit is in the form of exponentially decays to reduce,the internal friction angle changes very little.
Effect of nano CaCO3 on durability of concrete
Authors: Yang Jiangong
Published: May 2020

Through comparatively analyzing the impermeability and compressive strength test data of nano CaCO3 concrete with different content, this paper puts forward the method of optimizing the durability of nano CaCO3 concrete, and studies the influence of the content of fly ash on the durability of nano CaCO3 concrete on this basis, so as to provide a reference for improving the durability of concrete, so as to improve the recycling and reusing efficiency of building materials, and accelerate the practical application of nano CaCO3 concrete in engineering.
Simulation Research on Application of Azimuth Electromagnetic Wave in Coal Seam Detection
Authors: Gang Chen , Long Chen , Yiren Fan , Quanxin Li
Published: May 2020

Aiming at the problems of poor detection accuracy and low efficiency on the roof and floor interface in horizontal well drilling in coal mine, the design idea of explosion-proof azimuth-while-drilling electromagnetic wave logging instrument in coal mine was put forward. In order to suit the working environment of underground coal seam, the change law of the influence of instrument parameters such as source distance and coil installation angle on the signal response was obtained through forward simulation. Through the simulation research on the response of azimuth-while-drilling electromagnetic wave logging instrument, it provided a basis for selection of parameter optimization design of the instruments applicable to the underground coal mine, and the change law of the response of coal rock roof and floor interface was mastered. The application of this instrument will improve the detection accuracy and efficiency on the roof and floor.
Prediction of Shear Characteristics of Unsaturated Soil Based on BP Neural Network
Authors: Lei Liang Jia , Ri Jin Guang , Xie Shen Zhi
Published: May 2020

The prediction model of shear strength parameters of unsaturated soil based on indoor test data is established by using BP neural network. Five kinds of network models with different number of hidden layer nodes are trained and studied, and the best network model is selected to conduct the prediction. The results show that the optimal BP network model is a single hidden layer structure of 8-16-2. Using this model to predict, the correlation coefficient and regression coefficient between the predicted value and the measured value are high, and the predicted result is reliable, so the method has certain practicability.
Research on the measurement system of drilling while engineering parameters for intelligent drilling in coal mine
Authors: Jie Lian
Published: May 2020

In order to ensure safe and efficient mining and improve the efficiency of drilling construction, intelligent drilling technology has been studied in China. This technology is another development on the basis of automation. In addition to the automatic execution of the construction process, it also has the characteristics of intelligent perception, intelligent decision-making and intelligent correction. This technology requires engineering parameter measuring equipment to obtain the engineering parameters such as torque, WOB, inner and outer annulus pressure, rotation speed, vibration, temperature, etc. near the drill bit at the bottom of the hole in real time, so as to realize the real-time monitoring of the drilling process parameters at the bottom of the hole and the stress state of the drilling tool in the process of directional drilling, and increase the effective extraction distance of the drilling hole.
BIM Research Topics and Progress in the Construction Field: Analysis Based on Knowledge Mapping
Authors: Yang Hongxiong , Wang Duo
Published: May 2020

The CNKI database and the WOS database are used as data retrieval sources for research literature related to BIM technology at home and abroad. Based on scientometrics and bibliometrics, through the analysis of keywords co-occurrence analysis, the hotspots and frontiers of BIM technology research in the construction field are quantitatively analysed, revealing the evolutionary trend of BIM technology research in the construction field. The research finds that BIM technology research in the construction field at home and abroad has roughly gone through three stages. Based on the combing of research frontiers and research hotspots, and analysis of their evolution trends, future research on BIM technology in the field of architecture will focus on the following directions: BIM technology is combined with the Internet of Things and cloud computing to conduct research, focusing on the application of BIM technology in risk management and the application of VR virtual reality technology.
Analysis of Monitoring Data of Wild Animal Passages on the Highway in the Desert of Gobi, Xinjiang
Authors: Wang Zhaoming , Zhou Gang , Shao Shegang , Wu Xiaomin , Zhu Yufeng , Zhang Hongfeng
Published: May 2020

This is paper is taking the design of wildlife corridor from Mingshui to Hami section of national expressway from Beijing to Urumqi as an example. From January 2015 to May 2018, the project team monitored and studied the wildlife utilization of 13 corridors along the route from Mingshui to Hami. High utilization rate was detected with 3 channels.
Experimental investigation on creep behavior of clastic rock
Authors: Yu Zhang , Yan Zhang , Song-hua Mei
Published: May 2020

Many deflected fault zones exist under the dam foundation Xiang-jiaba Hydropower Station in southwestern China. Clastic rock is the main medium with poor physical and mechanical properties. In or-der to study the creep properties of the clastic rock, triaxial compression creep experiments were carried out on a rock servo-controlling rheology testing machine. From the test results, it can be concluded that the clastic rock has obvious creep characteristics, and the time-dependent deformation is large. Based on the test results, the relationship between axial strain and time under different confining pressures is studied. The relationship between axial strain rates and deviatoric stress under different stress levels is also discussed in de-tail. Furthermore, the creep failure mechanism under different confining pressures is analyzed as well. Therefore, the creep law of the clastic rock specimen is gained. The relationship between the Burgers creep model and its parameters is obtained by fitting the creep curve with Burgers creep model. The result shows that Burgers model can accurately describe the creep properties of the clastic rock in Xiang-jiaba Hydro-power Project.
Study on Integrated Planning and Management in Lhasa River Basin
Authors: Huidong Su , Yin Liu , Huiting Lu , Dongbo Wang , Tianian Jin
Published: May 2020

As a political, economic and cultural center of the Tibet Autonomous Region, the Lhasa River needs to take planning and management of the basin. In the past 60 years, the temperature of Lhasa River Basin has been increasing gradually at an annual rate of 0.047 ° C, which leads to the water cycle variation of the river basin and its associated aquatic ecology and environment continue to change and evolve, and ecological environmental protection is affected by more uncertain factors. Based on the assessment of the ecological environment of the Lhasa River Basin, the comprehensive planning suggestions for the Lhasa River Basin were proposed from the aspects of water environment, land use, ecological pattern, and economic and social development. These suggestions are drawn on the examples of integrated planning and management of catchment in foreign countries and are referred to as the comprehensive planning of the seven major river basins in China.
Accumulation characteristics of total flavonoids in Sanhongmiyou and Huangjinmiyou
Authors: Wang Jiaqi , Xu Wenxin , Tang Xiaoyu , Yao Yuan , Wang Bozhi , Jiang Xinyao , Gao Yifei , Han Yan , Xiong Bo
Published: May 2020

The experiment was conducted to study the tendency of the change of flavonoids content in pomelo during its growth and development and the characteristics of flavonoids accumulation in different cultivars Guanximiyou. The dried samples of the exocarp, mesocarp, and pulp of Sanhongmiyou and Huangjinmiyou were used for measuring the content of total flavonoids. The results showed that the content of total flavonoids in exocarp decreased first and then increased during growth and development, while the content in mesocarp did not change obviously. Furthermore, the content in pulp showed a decreasing trend. The content in exocarp was the highest at the earlystage, while in mesocarp was the highest at the mature stage of the fruit. The content of total flavonoids in exocarp and pulp of Sanhongmiyou was higher than that of Huangjinmiyou, total flavonoids content in the exocarp of Sanhongmiyou was similar to Huangjinmiyou within 150 days after anthesis. In addition, the variation trend of the two cultivars was consistent throughout the whole growth and development.
Effect of bagging on the aroma compounds in mangoes during different postharvest stages
Authors: Wei Changbin , Ma Zhiling , Qiao Jian , Tang Xinming , Yan Qingze , Tang Lizhu , Du Liqing
Published: May 2020

In order to study the effect of bagging on the aroma quality of mangoes, experiments were performed on “Tainong No.1” mangoes with 2 types of bags, namely white single-layer bags (WB) and yellow/black double-layer bag (BB). With non-bagging fruits as the control group, the aroma compounds in the mangoes in different postharvest stages were analyzed via solid phase microextraction-gas chromatography-mass spectrometry (SPME-GC-MS). The results indicated that 19 aroma compounds were detected in testing fruits, which were mainly terpenoids. We observed that the effect of bagging on the synthesis of aroma compounds in the mangoes differed among different postharvest stages. Compared with the control group, bagging inhibited the aroma synthesis in the fruits in the early postharvest stages, but facilitated it in the later stages. Additionally, the white single-layer fruit bags had a better effect on the aroma synthesis in postharvest mangoes; hence, it is advisable to use white single-layer fruit bags for mango production.
Construction and research of water quality monitoring system based on ZigBee technology
Authors: Heng Fan
Published: May 2020

The water quality monitoring system proposed in this paper is to establish a monitoring system by using the ZigBee technology .The sensor nodes are placed in the monitoring area to form a tree-type network topology, and the data of the water quality parameters (including PH value, turbidity, water temperature, electric conductivity, etc.) are collected and analyzed. This paper mainly expounds the construction of the hardware system of the monitoring system, establishes the test model of the hardware system, simulates the placement of the sensor node to obtain the experimental data, and provides the hardware test result for the overall system design.
Study on the effect of DA-6 on the maturity and fruit quality of ‘Aikansui’ pear
Authors: Zhang Huiyi , Li Huizhi , Wang Huaer , Duan Changwen , Zhang Haonan , Xiong Bo , Wang Zhihui
Published: May 2020

The effect of DA-6 treatments with different concentrations on the maturity and fruit quality of ‘Aikansui’ pear was studied. The results showed that the effect of treatment at 35 mg •L-1 was the best, followed by 30 mg •L-1. The treatment of 35 mg •L-1 could increase the sugar content of the fruit, reduce the content of titratable acid, and advance the maturity of the fruit to the greatest extent. The 30 mg •L-1 treatment had the most significant effect on the increase of fruit weight and the Vc content.
Optimal Design and Practice of the Construction Scheme for Laying the Whole Track Bed on the Subway Ballastless Track
Authors: Hui Chen , zhenfang Qi
Published: May 2020

In the development of modern society, our country attaches more importance to the development of the construction industry, and strengthens the supervision, so that the construction industry can be developed to the mode of industrialization. That combining with the construction needs of prefabricated concrete assembly in our country and taking comprehensive analysis of various factors and application, can enhance the structural stability and safety of prefabricated concrete assembly, thus can meet the needs of the modern building industrialization development, and improve the overall quality and efficiency. In the development of subway transportation field, laying the whole track bed of Ballastless track is an important core work, which is the new construction of rail transit. This paper made perfect management system, carried out all kinds of work, improved the construction technology of the whole track bed and perfected the construction plan, with the result of prolonging the service life of the subway ballastless track and promoting the stable development of modern society in our country.
Analysis of Cracks in an Underground Garage and Research on the Load Test of reinforced pavement
Authors: Zhanhua Zhang , jie lI , Na Han , Kun liu , Shan Zhang
Published: May 2020

Cracks often appear in the process of construction and use of concrete structures. It is normal for concrete to have cracks, but the size and quantity of cracks exceed certain limits. Therefore, it is necessary to analyze the structural cracks. According to different cracks, corresponding treatment methods are given. Experiments can be done if conditions permit to verify the safety of the structure after reinforcement. The paper detected and analyzed the cracks appearing on the structure components by using an example of an underground garage project. And It was proposed about corresponding reinforcement treatment scheme. This project provides reference for similar projects or scientific research, and it provides a good research direction.
Study on Evaluation of Economical and Intensive Use of Construction Land in Shahe City
Authors: Liu Hongjie , Su Yu , Ma Jing
Published: May 2020

Taking Shahe City of Hebei Province as an example, a reasonable evaluation index system of population, economy and land was established, and construction land economical and intensive utilization level of Shahe City was evaluated using analytic hierarchy process. The results showed that the economical and intensive utilization of construction land in Shahe City was in the middle level, and the value was 74.43. The result of the evaluation roughly reflected the economical and intensive utilization of construction land in Shahe City. The corresponding policy suggestions and measures aiming at the problem of land use status were put forward.
Study on the design strategy of prefabricated steel structure green farm house in cold areas——taking a farm house design practice in shandong, china as an example
Authors: Sun Ninghan , Cui Yanqiu
Published: May 2020

With the vigorous promotion of the development and construction of “beautiful countryside” in China, the irrationality of the functional space of rural farmhouses and the energy conservation and consumption reduction of farmhouses have become urgent problems. In this paper, the design practice of a green agricultural house with prefabricated steel structure in Shandong province was taken as an example. Based on a variety of factors such as environmental characteristics, regional characteristics, and technical conditions, design and application research were conducted from the aspects of building shape and functional space design, appropriate green building technology. What’s more, the energy consumption simulation software was used for its quantitative analysis of energy saving effects and indoor temperature, and a green farm house design strategy adapted to the characteristics of cold climate, regional characteristics, and future development trends was discussed, which was intended to provide a technical reference for the construction of beautiful countryside.
Research and application of the flood simulation and operation model in Beijing
Authors: Chai Fuxin , Liu Shu , Sun Yang , Huo Fenglin
Published: May 2020

This study built a coupling model of hydrology and hydrodynamics for flood forecasting and reservoir-dam joint scheduling. And using HTML5, java, and WebGIS technology, developed a flood control operation system based on B/S framework for Beijing, integrated real-time information and fundamental information of metrology, rainfall, water flow, engineering situation, and waterlogging of Beijing. Through verification, the system has been successfully adopted to analyze the 2018 Ampil typhoon and provide a scientific basis for reservoirs operation including Yaoqiaoyu, Shachang, Haizi, ensuring safety of the reservoirs and reducing the economic loss of downstream area of reservoir.
Core Ideas of the Application and Research of the Construction Technology of the Foundation Slab Concrete of the Building Foundation
Authors: Jiao Liu Zhi
Published: May 2020

Since our country entered the 21st century, our country’s social economy has achieved remarkable achievements compared with the past, and the economic development has accelerated significantly. This has created good conditions for the healthy and sustainable development of the entire construction industry. Especially in recent years, the construction industry has occupied an increasingly important position. At present, with the advancement and development of science and technology, China’s building technology has achieved better development than before. Various modern buildings have emerged continuously, and the construction of foundation slab concrete has emerged. With its own various characteristics, in the specific construction, it is necessary to strengthen the attention to various construction problems, such as easy cracking, large shrinkage and high water heating, etc. At the same time, it is necessary to combine specific construction standards and pay attention to research on related construction technology can promote the overall and steady improvement of the overall project quality.
Long-distance Pipe Jacking Technology in Municipal Water Supply and Drainage Engineering Construction
Authors: Xuemei Guo
Published: May 2020

Nowadays, with the sustainable economic development in China, the management of the urban constructional planning in various cities in China has also made great progress and improvement, and urban infrastructure construction is also constantly being improved. To make people’s work and life more convenient, municipal projects are also increasing. Municipal water supply and drainage engineering construction in cities are indispensable in urban infrastructure construction. Long-distance drainage often occurs in the construction of water supply and drainage. In order to solve this situation, relevant staff have specially developed a series of long-distance pipe jacking technology and applied it to the construction of municipal water supply and drainage projects, which greatly improves the quality and the efficiency of municipal water supply and drainage projects.
Feasibility study of high-precision trigonometric elevation replacing second-order level in tunnel penetration control survey
Authors: Hongfeng Zhang
Published: May 2020

Based on the principle of trigonometric elevation measurement and the law of error propagation, the trigonometric elevation formula is derived in this paper. The factors that cause the trigonometric measurement error are analyzed accurately. It is considered that the use of a high-precision total station for the trigonometric elevation measurement under opposite conditions can reach the second-order level measurement accuracy.
Research on the mechanical properties of concrete stub column under axial compression loading with square steel tube self-compacting iron tailing
Authors: Wang Yuan Xi , Du Xi Kai , Liu Jing Hong
Published: May 2020

In this paper, the influence of steel rate and substitution rate of iron tailing powder on the bearing capacity of the stub columns is mainly investigated through the test of five concrete stub columns under axial compression loading with square steel tube self-compacting iron tailing, and the test bearing capacity is compared with the bearing capacity calculated by each code. The test results show that the bearing capacity of the test piece increases obviously with the increase of the steel content; the bearing capacity of the test piece is less affected by the substitution rate of iron tailing powder; it is suggested to use code GB50936-2014 to design and calculate the bearing capacity of the stub column under axial compression loading.
Study on Module Design of Residential Units in Prefabricated Boarding Schools
Authors: Di Qin , Zhilei Xin , Pengkun Gao
Published: May 2020

This paper aims to respond to the country’s call for the development of prefabricated buildings. Taking the middle school student dormitory interior decoration system as the research object, the prefabricated decoration and building modularization ideas are the core. The literature research method and the inductive summary method were used to analyze the residential unit modules, the functional modules and envelope modules they contained, and the combination of modules, which proved that this construction method is more efficient and environmentally friendly. Finally, a residential unit module scheme suitable for boarding school students’ dormitories is designed to provide a reference for improving the overall assembly rate of prefabricated student apartments.
Application of BIM technology in the construction of ChangKe 6# building
Authors: Cui Yan , Tai Yingyu
Published: May 2020

The construction industry complies with the development needs of the times, constantly explores new ways of transformation and upgrading, and the emergence of BIM Technology leads a new route for the future development of the construction industry. BIM Technology is widely used in the construction process of the 6# building Changke, which effectively improves the management efficiency in the whole construction process. In this project, first of all, the relevant practical software is used to prepare the project budget document, the schedule plan , the material procurement plan are prepared in combination with the quantities, the situation awareness effect of the construction site is presented in combination with BIM site management and other software, and the all-weather information management of the whole site and all areas is realized.
Research on Planning and Design of Urban Architectural Color in Changchun
Authors: Cui Zhang
Published: May 2020

Architecture is the soul of city color. The planning focus of city color is city architecture, especially the planning control of the main wall color of street buildings. The design of architectural color should not only consider the surrounding environment of the building, the content of the building and the building materials, but also proceed from the aesthetic needs and conform to the principle of color engineering. On this basis, the plan proposes color design guidelines and relies on scientific and standardized “urban building color design guidelines” to achieve the purpose of maintaining the original appearance of history and creating a new era style. Besides the traditional buildings, the other “architectural color guidelines” should leave more room for manoeuvre and not restrict the creative thinking of architects.
Reconstruction and optimization methods of old university teaching buildings
Authors: Siyu Shao
Published: May 2020

This paper mainly studies the reconstruction of the old teaching building in China. There are many buildings in our country, aging phenomenon is serious, indoor teaching mode is not suitable for modern education. Through the analysis of the main existing problems of indoor environment, the paper puts forward the suitable renovation scheme from the aspects of energy allocation, indoor thermal environment and comfort, so as to make the teaching building suitable for the use of modern education.
Research on Greening Design Based on Urban Landscape
Authors: Jia-Xin Zheng , Hao-Ran Tu , Kun-Fa Lee
Published: May 2020

Garden landscape is the basic construction of a city, which can effectively improve the ecological environment of a city, highlight the urban cultural characteristics and the quality of life of the residents. The landscape design project uses the internal space of the garden to improve the quality of the city, protect the ecological environment, improve the greening of the city and improve the quality of the urban living environment, and continue to develop green landscapes to improve the urban environment and improve the living comfort of living.
Stress on Steel-concrete Composite Truss Joints Research Status and Application Overview
Authors: Zeng Rui , Xie Xinying , Zhang Xuan
Published: May 2020

Based on the comprehensive analysis of various stress research schemes for steel-concrete composite truss joints, the current research status of steel-concrete composite truss joints and epoxy resin concrete at home and abroad are systematically elaborated. The existing problems in the current composite truss joints are analyzed, and possible solutions are proposed. At present, the research on epoxy resin concrete has been very extensive. Epoxy resin concrete has high strength, good toughness, high impact strength, good chemical corrosion resistance, wear resistance, water resistance, frost resistance, tensile resistance and compressive resistance, which make it widely used in engineering. The problem of using epoxy resin concrete instead of ordinary concrete in steel-concrete composite truss is put forward, analyzed and discussed.
Experimental study on seismic performance of frame flat columns with high axial compression ratio
Authors: Zhang Guojun
Published: May 2020

When the lateral stiffness of the frame flat column is relatively small, the strength of the frame flat column is not enough to resist the large horizontal earthquake force and seriously deformed, which leads to the structure fail and could not work normally. In order to study the bearing capacity and the deformation capacity, experiments of three specimens of high axial compressive ratio under frequency cyclic loading were conducted, in which the failure process were observed in detail and the failure mechanism of the specimens were researched, the failure type, the hysteretic characteristic were studied, and the effect of the axial compressive ratio, the ties type and the stirrup ratio on the ductility of the members were analysed.
Vibration response of railway cable-stayed bridges under high-speed train braking loads
Authors: Lu Long
Published: May 2020

With the increase of the running speed of high-speed trains, the longitudinal vibration of the long span railway cable-stayed bridge under train loads has increased significantly. And the probability of high-speed train braking is greater than earthquake. The excessive vibration response will affect the serviceable of the cable-stayed bridge. Fluid viscous dampers (FVDs) and elastic cables (ECs) which are widely used in seismic design of the bridge are adopted to control the longitudinal vibration response of the cable-stayed bridge induced by train braking loads. The influence of the design parameters of FVDs and ECs on the response of the bridge is studied. And the effectiveness of FVDs and ECs on mitigating the longitudinal response of the bridge is also discussed. It is found that installing FVDs and ECs between the deck and the tower is very efficient in reducing the longitudinal vibration of the railway cable-stayed bridge subjected to train braking loads, especially the longitudinal displacement of the deck and the bending moment of the tower.
Research on Intelligent Evaluation System of Load-bearing Capacity of Existing Reinforced Concrete Bridge
Authors: Zhao An , Xu Qiang , Song Jianyong
Published: May 2020

The intelligent evaluation system of existing reinforced concrete bridge “BLP” is a special software for the load-bearing capacity rapid analysis and evaluation of the existing reinforced concrete bridge, which was developed by the Highway Research Institute of the Ministry of Transport. Based on the parametric modelling method, it can quickly and easily establish the finite element plane model of the bridge structure for the static analysis of ultimate bearing capacity limit states and serviceability limit state, under variety norms. And it can easily and quickly build variable-section beams and rebars, with the special module. According to the comprehensive modification method of the load-bearing capacity evaluation, it can automatically recommend checking sections, and automatically calculate partial modification coefficient of resistance effect, and conveniently judge the safety coefficient of the sections, and quickly get the results of bridge load-bearing capacity. In summary, this system can significantly improve the work efficiency and accuracy of load-bearing capacity for exiting reinforced concrete bridge. This paper introduces in detail the characteristics of the intelligent analysis technology, calculation principle and real bridge application examples of the system.
Research on public perception and participation in the relic park——taking Zhengzhou Shang Dynasty city wall relic park as example
Authors: Wu Zhengwang , Ye Jingyi
Published: May 2020

The city wall relic park in Zhengzhou is a city park built on the Shang Dynasty city Wall site. As Zhengzhou is chosen as the eighth ancient capital of China, it is gradually recognized by the public. However, due to the lack of protection, development and utilization of the site, the historical value and cultural value of the Shang Dynasty Wall in Zhengzhou have not been fully shown. The construction of the city wall relic park is related to the soft inheritance and protection of the historical heritage. The spiritual inheritance of the historical heritage mainly depends on the spiritual transmission of the public. The public has the most direct feeling and understanding of it, so it is necessary to introduce public participation. In this paper, the scientific evaluation method Post Occupancy Evaluation (POE) is used to discuss the problem found by the public when using the city wall space. Suggestions and public participation strategies are given on the construction of the city wall relic park. We need to think about if there is public participation in the site now and how to let the public participate in planning, construction and management of the relic park. In order to make the city wall become the city’s leisure living room, to build the brand of Zhengzhou, and make it famous across the whole country, it’s urgent to put forward countermeasures for the development problem of Zhengzhou.
Research on the evaluation system of green highway in the whole life cycle of South China Mountain Area
Authors: YU Shengjun , Li Jiang , Feng Chenhui
Published: May 2020

The urgency of the global environmental impact has made mankind pay more and more attention to the issue of sustainable development in all fields. The field of highway construction is no exception. Traditional highway construction has the characteristics of high investment, high energy consumption, wide pollution and strong destruction, and serious environmental impact, which is not conducive to the long-term development of society and the country. From the point of view of life cycle, combined with Current Events and Policies, green concept, Four-New Technology and consulting experience in highway construction of many years, this paper puts forward a three-stage green highway construction system of green design, green construction and green road maintenance. to promote the healthy, sustainable and green development of highway industry.
Risk assessment of foundation pit construction using cloud model
Authors: Xun Tian
Published: May 2020

The risk level evaluation of foundation pit construction has the characteristics of fuzziness and randomness. Based on the theory of cloud model, a new model of risk level of foundation pit construction is discussed to comprehensively analyze the fuzziness and randomness of foundation pit construction risk assessment. Firstly, the evaluation index system of foundation pit construction risk level is established according to the field monitoring value, and then the cloud numerical characteristics of each evaluation factor belonging to different risk levels are calculated. According to the cloud digital characteristics of each evaluation factor, the determination degree of each evaluation factor belonging to different risk levels can be obtained. Finally, the weight and determination degree of the evaluation factor can be calculated comprehensively to obtain the comprehensive certainty degree of foundation pit construction risk, so as to determine the foundation pit construction risk level. The results of practical application and comparison with other evaluation methods show that this model is effective and feasible for risk classification of foundation pit construction, and has the advantages of simple calculation process and reliable results, which also provides a reference for the analysis of other similar problems.
Characteristics of airflow in the platform with high-speed train passing through the underground railway station
Authors: Li Qizhang , Xie Yongliang
Published: May 2020

Underground high-speed railway station is becoming more and more popular in recent years, due to its advantage in relieving the tense situation of urban construction land. HVAC (Heating, Ventilation and Air Conditioning) system of underground railway station consumes large energy, therefore it is necessary to find a way to decrease the energy consumption in stations. Reasonable ventilation and air organization are the basis of energy-saving design of environment control system in stations. The energy consumption could be reduced greatly by utilizing the piston wind properly. In the present work, airflow characteristics in the station are investigated when high-speed train is passing through the underground railway station with CCM+ software. Results show that piston wind has different effects on airflow in the platform when the high-speed train is running. However, the air velocity in the platform is always lower than 5 m/s. In order to analyse the effect of piston wind on the airflow in the platform in more detail, the velocities and temperatures at waiting line are extracted. The air velocity near two ends of platform is larger and the similar results could also be observed for temperatures.
New advances in catalysts for polystyrene hydrogenation
Authors: Xu Ruoyi , Li Qianwen , Huang Hui , Tao Shiying
Published: May 2020

Polystyrene is one of the most widely used plastics, and could be catalytic hydrogenated to polycyclohexylethylene with improved physical properties. The research progress in the efficiency palladium catalyst for polystyrene hydrogenation was illustrated and reviewed, further development was discussed.
Preparation and photocatalytic hydrogen evolution of g-C3N4/ZnO composite
Authors: Ma Shenghua , Wang Wanxi
Published: May 2020

The photocatalytic composite of g-C3N4/ZnO with different g-C3N4 content have been prepared by thermopolymerization method. The catalysts are characterized and analyzed by SEM, XRD, UV-Vis, BET and other analytical methods. The results show that g-C3N4/ZnO composites caused the red shift of the absorption band edge of ZnO, which increased the absorption of visible light and the separation rate of photogenerated electron-hole pairs. It is found that the H2 production rate of 25% g-C3N4/ZnO sample is best with 306.25 μmol∙h-1∙g-1, which is 4.6 times higher than of g-C3N4.
Evaluating the Water Vapor Transmission Properties of Summer Cooling Towels
Authors: Lam Yim-Ling , Wang Wenyi , Kan Chi-Wai , Sasithorn Nongnut , Maha-in Kongkiat , Sujarittanonta Lavanchawee , Puakpong Sarunya , Mongkholrattanasit Rattanaphol
Published: May 2020

This study evaluated the cooling properties of summer cooling towels of different brands by studying the water vapor transmission behavior. All the samples were found to provide a cooling effect at first contact after being wetted. The samples of N-rit showed the highest cooling effect followed by Cooldyxm and Ice Towel, whereas Perfect Fitness had the poorest cooling effect.
Cause Analysis of SA-210 Steel Water-Cooled Wall Leakage
Authors: Zhao Hai , Jiang Chong , Tian Cheng-chuan
Published: May 2020

When the SA-210 steel water-cooled pipes are under high temperature and high pressure, high pressure steam will generate an outward pressure on the inner wall of the pipes, which will cause the pipe to swell outward. If there is a small defect on the inner wall of the water-cooled tube, this defect will become a stress concentration point. The additional pressure acts on the stress concentration point to cause cracks, and after the cracks generated, lead to the cracks to expand at the same time. In the cracks, vapor will diffuse into the matrix along the cracks, occurring corrosion under the action of high temperature, which further accelerates crack growth. Eventually, it leads to water-cooled tube wall leakage.