bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on the Development of New Energy Vehicle Sharing in China Based on the Concept of Green Travel
Authors: Lv Anqi , Zhu Zhiqiang , Cheng Guohua , Jia Yi , Shi Ling
Published: May 2020

As the urbanization in China is accelerating, “urban diseases” such as city congestion and environmental pollution arise. Traffic is one of the important factors leading to such urban problems. Therefore, in order to succeed in pollution prevention and control, overcome the shortcomings in urban traffic, and realize high-quality development of transport service, we should promote the development of green transport based on low carbon and environmental protection, and intensively implement green travel. First of all, we should accelerate the upgrading of transportation equipment technology, speed up the promotion and application of new energy vehicles in the field of car sharing, and promote the green and low-carbon development of transport service. Based on it, this paper first defines the green travel, new energy vehicle sharing and other related concepts, and analyzes the impact of new energy vehicle sharing, and then sorts out the development process of new energy vehicle sharing in China and analyzes the development trend and problems being confronted with in this field, and finally puts forward the development policy suggestions on domestic new energy vehicle sharing.
Analysis and Future Market Forecast Research of China’s End-of-life New Energy Vehicle Recycling and Dismantling Technology
Authors: Jia Wang , Yuke Li , Wei Pan , Zhenbiao Li
Published: May 2020

With the rapid increase in the promotion and application volume of new energy vehicles in China, the number of end-of-life new energy vehicles will increase rapidly in the future. Moreover, it brings difficulties to the dismantling of new energy vehicles because of the flammability and explosiveness characteristics of the power battery in new energy vehicles. This paper analyzes the dismantling technology of end-of-life new energy vehicles in China and abroad, and forecasts the inventory of new energy vehicles and the number of end-of-life new energy vehicle in the future, which has important reference significance for the future development of China’s industry. Finally, the paper puts forward suggestions to promote the development of the industry.
Exploring how to build innovation and entrepreneurship education ecosystems in universities in Guangdong against the backdrop of the Guangdong-Hong Kong-Macau Greater Bay Area
Authors: Zhu Qianyu
Published: May 2020

Universities are cradles for intellectual and technical innovators, and thus building an innovation and entrepreneurship education ecosystem in universities is of strategic importance for national development. Most studies in China, from the perspective of collaborative innovation, used the EPM model to analyze the features, elements and operational modes of innovation and entrepreneurship education ecosystems in universities based on theories of symbiosis, competition and cooperation, coordination, networking, and the exchange mechanism. Boosted by the strategies to develop the Guangdong-Hong Kong-Macau Greater Bay Area, universities in Guangdong start to build innovation and entrepreneurship education ecosystems equipped with such functions as education, service, practice and research in order to promote sharing of resources, build a well-functioning ecosystem and bolster regional economic growth. To build innovation and entrepreneurship education ecosystems, universities can make efforts from the following aspects: to perform overall planning in a top-down manner; to improve the global innovation-entrepreneurship course system and promote multi-pronged course reforms; to introduce excellent teachers and build a team of “triple-competent” teachers; to build a platform for improvement of innovation and entrepreneurship education; to improve innovation and entrepreneurship services and provide customized guidance; encourage training of innovators and entrepreneurs with a global vision to support advancement of the Greater Bay Area and the Belt-and-Road Initiative.
Analysis on the Impact of Regional Air Quality in Industrial Cities: A Case Study of Huinong District of Shizuishan City
Authors: Dong Wei
Published: May 2020

In order to explore the influencing factors of regional air quality in industrial cities, this paper takes Huinong District of Shizuishan City as the object for analysis. The author sets up monitoring points in Huinong District of Shizuishan City to monitor the gas emission of polluting enterprises in various industries, and then analyzes the impact of the industrial park and surrounding environment of Huinong District on the air quality in the urban area. The analysis results show that the hourly contribution values of SO2 and PM10 emitted by Hebin Industrial Park were 0.756 mg/m3 and 0.444 mg/m3, respectively, while that of sulfur dioxide and PM10 emitted by heating companies were 0.865 mg/m3 and 7.629 mg/m3. These are the main causes of serious air pollution in the District.
Design and implementation of intelligent environment monitoring system based on OneNET platform
Authors: Lin Jin , Yuping Ma
Published: May 2020

With the development of electronic technology, remote monitoring has become the main development direction of data management. The monitoring of indoor environmental data is our main research content. The OneNET platform provided by China mobile communications corporation is used as the coordination command center of the intelligent monitoring application system for terminal design and development. OneNET platform provides standardized access terminal and the background monitor template type design method of the staff through constructing a set of environmental data acquisition and monitoring system based on OneNET, implementation of indoor environment parameters, such as temperature, temperature and concentration of PM2.5 real-time reporting and management operation, with abnormal data of automatic alarm. The system shows that the design based on the open platform can effectively improve the generation efficiency of new business and promote the development of Internet of things business.
Design of and Research on underground pipeline system in campus based on 3DGIS
Authors: Ma Rui , Yi Chongzheng , Zhang Li , Yan Jianguo
Published: May 2020

The underground pipeline of campus is an extremely complex and huge system, and the traditional pipeline management mode can no longer meet the requirements of campus development and planning. The 3D geographic information visualization method can accurately describe the location and distribution information of various pipelines and spatial features, which can better serve the management of underground pipelines on campus. This paper designed overall framework and technology framework of underground pipeline information system, the system is satisfied with the PC, Web, mobile terminal and other multi-client access. In this paper, the key technology points of underground pipeline system construction on campus are comprehensively analyzed, and the feasibility of the technology is verified by combining with the practical application of underground pipeline system in lanzhou university.
Study on reasonable nozzle size after volumetric fracturing of glutenite reservoir
Authors: Le Shi , Ruochen Li , Gan Luo , Za Dan-Mao Lahong Gu Li , Bin Li , Jing Chen , Yi Li
Published: May 2020

What kind of drainage system should be adopted after the volumetric fracturing of the glutenite reservoir in the Mahu 1 well area, lack of systematic research. The reasonable choice of the size of the nozzle is the key to determining the flow back of the fracturing fluid and stable production. By comparing the applicability differences of fracturing and drainage systems at home and abroad, this paper analyzes the production experience of neighboring areas and determines the overall principles of drainage system: small displacement principle, stable drainage principle and step-by-step amplification principle. Then, by calculating the rate of change of oil production, analyzing the system well test curve and production curve, and determining a reasonable drainage system, it is concluded that the volume of the glutenite reservoir after fracturing should be 1.5 mm small nozzle, and the pressure is gradually stabilized. The grade is replaced by a 2.5 mm nozzle. Most of the wells are finally stabilized in the 3.0 mm nozzle production. A small number of wells can be properly enlarged to a 3.5mm nozzle for stable production. Under the guidance of this understanding, the horizontal wells in the Mahu 1 well area have basically reached the design capacity, providing theoretical basis and guidance for the production practice after volume fracturing.
A new method for Rayleigh wave inversion by geological unit merging
Authors: Wang Shu , He Dengke
Published: May 2020

Rayleigh wave exploration is widely used in engineering investigation due to the advantages of speediness, small attenuation, and strong anti-interference ability. However, it is difficult to get accurate results since the Rayleigh wave inversion is a multi-parameter and high nonlinear problem. During the inversion, the strata over the target layer must be divided into many thin layers. The more thin layers are divided, the more parameters are needed to invert. Usually, the number of parameters is much larger than the actual data points, which makes the inversion an under-determined equation. Actually, the several adjacent thin layers will be the parts of a same geological unit. The paper therefore proposed a new method for Rayleigh wave inverting based on geological unit merging into a super unit. Simultaneously, the Bayesian estimation was introduced to determine if the adjacent thin layers could be merged into larger ones. The synthetic model testing demonstrated that the new method is feasible and can effectively improve the accuracy of the inversion.
Study on inversion of coal seam temperature in mining area --Pingshuo mining area of Shanxi Province
Authors: Chen Yuexin , Liao Shunbao , Qin Dahui
Published: May 2020

Landsat 8 is widely used in the extraction of surface temperature, but the data of surface temperature and abnormal area in Pingshuo mining area is vacant based on Landsat 8 in recent years, and there is no standard optimal algorithm to follow. In order to explore the possibility of underground coal fire in Pingshuo mining area of Shanxi Province in the future, based on the Landsat 8 satellite data, the temperature inversion method is used to observe the temperature distribution of the mining area, and three commonly used algorithms of temperature inversion processing are used to compare and analyze the SC algorithm as the best data processing method. The artificial threshold method and NDVI threshold method are used to extract the temperature anomaly area and vegetation coverage area, and calculate the area and proportion of coal fire potential area. According to a series of the data and result charts analysis, it shows that: the highest vegetation index of Pingshuo mining area is 0.79, the vegetation coverage is low, and the surface temperature is more than 41.44 ℃, which may lead to the spontaneous combustion of underground coal mines. However, the area prone to underground coal fires is small and controllable. According to the area of potential coal fires in the mining area, the local relevant departments can take relevant measures to prevent coal fire through the distribution map of potential coal fires.
Research on fusion of GF-6 imagery and quality evaluation
Authors: Liu Guo , Wang Yizhe , Guo Li , Ma Cuifeng
Published: May 2020

Gaofen-6 (GF-6) has the advantages of wide coverage, multiple resolutions, and multiple bands. Image fusion method is the key process in high resolution remote sensing application. Beijing Daxing International Airport was selected as the experiment area and four image fusion methods of HPF, NND, Gram-Schmidt and Pansharp were employed to process panchromatic and multispectral imaging. The results demonstrated that Pansharp was the best algorithm for image information and spectral fidelity of GF-6, taking into account the preservation of color effects of images and enhancement of spatial details, which can meet most fusion needs. HPF’s color retention is not as good as Pansharp algorithm. The contrast of the NND algorithm result is relatively high, which may cause the local image to be too bright and the texture to be lost. The GS algorithm has lower information entropy and average gradient. Compared with the other three algorithms, it has a worse effect on spatial details and texture expression. This conclusion can provide key reference for scientific research and engineering application using GF-6 satellite image．
Analysis on the Relationship between Mangrove and Aquaculture in Maowei Sea Based on Object-oriented Method
Authors: Wei Zixin
Published: May 2020

Before 2000, a large number of mangrove forests in Guangxi were cut down for aqua-cultural purposes. After 2000, with the introduction of national, provincial and municipal policies on mangrove protection, this phenomenon was less frequently seen. By using the object-oriented method, referring to the spectral and texture characteristics of the ground target, and using the Landsat remote sensing images of 2000-2019, this paper extracts and analyzes the area and change of mangrove and aquaculture area in Maowei sea, Guangxi. The results show that the use of object-oriented methods can extract mangroves and aquaculture areas with higher accuracy. The area of mangroves generally shows an upward trend, with the area of aquaculture increasing first and then decreasing.
Research on the Layered Rock Mass Excavation Relaxation Stability of Underground Caverns
Authors: Zhang Ying , Zhou Heng , Di Shengjie , Lu Xi
Published: May 2020

In order to compare the influence of rock mass parameters weakening on the deformation and stability of excavation caverns in layered rock mass, based on power generation system caverns of a hydropower station, the stability and deformation of the caverns is analyzed. The results show that the mechanical characteristics of the structure surface play a major role in controlling the stability of caverns. And the displacement and yield zone value of plan 3, which adopt elastic-plastic softening model, are significantly larger than other two. The method which consider the residual strength of structure surface is more suitable for the excavation calculation of layered rock mass cavern.
Dynamic Monitoring and Stability Analysis of Rock-bolted Crane Girder In large Cavern With Layered Surrounding Rock
Authors: Liu Jing , Liu Xiaomin , Di Shengjie , Lu Xi
Published: May 2020

The large and medium-sized hydropower projects underground cavern group are basically in relatively integrate surrounding rock, so there are few engineering examples in layered surrounding rock with type III surrounding rocks as the main rock, and lack of successful experience. According to rock-bolted crane girder under the layered surrounding rock of a large underground power station, analyzing prototype dynamic monitoring data of the excavation, unloading and load-bearing test .The distribution of the monitoring data conforms to the normal law, and there are no large outliers, under the action of a large number of bolts, rock-bolted crane girder basically forms a good integrity with the layered surrounding rock, and the load-bearing test has no effect on the stress condition and stability condition of surrounding rock.
The positive integral points on the elliptic curve 𝒚𝟐=𝟕𝒑𝒙(𝒙𝟐+𝟖)
Authors: Xiancun Du , Zhao Jianhong , Yang Lixing
Published: May 2020

The integral point of elliptic curve is a very important problem in both elementary number theory and analytic number theory. In recent years, scholars have paid great attention to solving the problem of positive integer points on elliptic curve 𝑦2 = 𝑘(𝑎𝑥2+𝑏𝑥+𝑐), where 𝑘,𝑎,𝑏,𝑐 are integers. As a special case of 𝑦2 = 𝑘(𝑎𝑥2+𝑏𝑥+𝑐), when 𝑎 = 1,𝑏 = 0,𝑐 = 22𝑡−1, it turns into 𝑦2 = 𝑘𝑥(𝑥2+22𝑡−1), which is a very important case. However ,at present, there are only a few conclusions on it, and the conclusions mainly concentrated on the case of 𝑡 = 1,2,3,4. The case of 𝑡 = 1, main conclusions reference [1] to [7]. The case of 𝑡 = 2, main conclusions reference [8]. The case of 𝑡 = 3, main conclusions reference [9] to [11]. The case of 𝑡 = 4, main conclusions reference [12] and [13]. Up to now, there is no relevant result on the case of 𝑘 = 7𝑝 when 𝑡 = 2, here the elliptic curve is 𝑦2 = 7𝑝(𝑥2 + 8), this paper mainly discusses the positive integral points of it. And we obtained the conclusion of the positive integral points on the elliptic curve 𝑦2 = 7𝑝(𝑥2 + 8). By using congruence, Legendre symbol and other elementary methods, it is proved that the elliptic curve in the title has at most one integer point when 𝑝 ≡ 5,7(𝑚𝑜𝑑8).
Design of Lidar System Based on Marine Oil Spill Monitoring
Authors: Jing Li , Ying Che , Shuang Luan , Zhaoxin Wang , Kun Yang
Published: May 2020

The occurrence of offshore oil spill will cause great harm to Marine natural ecology and Marine living resources, and seriously affect Marine aquaculture, fishery, tourism and other Marine industries. In the field of monitoring oil spill accident, traditional passive remote sensing measurement is still relying on, and the monitoring of oil spill accident occurring at night is not very good. According to the condition of the surface of the oil spill at night monitoring requirements, design and development of laser radar for monitoring the sea are permeated with oil pollution. This article mainly from the super continuous spectrum of light sources and monochrome laser radar detector selection, spectrometer wavelength calibration, the structure of the optical system design, radar receiving system image quality evaluation, the mechanical structure design and mechanics analysis and prototype design aspects, introduces the first system design of laser radar in detail. The design indexes of lidar system for monitoring oil spill pollution meet the technical requirements.
Study on Application of Hawthorn Seed in Cultivation of Pleurotus ostreatus
Authors: Shi Guohao , Wu Shuai , Zhu Chuanhe
Published: May 2020

In the paper, the cultivation of Pleurotus ostreatus using abandoned hawthorn seeds as a culture medium was investigated. The results indicated that the addition of hawthorn seeds will slow down the growth of Pleurotus ostreatus, but will increase the biological efficiency, nutrient quality and antioxidant capacity of fruiting bodies. Under the condition that hawthorn seed content is 30%, the cultivated Pleurotus ostreatus fruit body has the highest biological efficiency, the strongest antioxidant capacity, and the best nutritional quality.
Study on the color difference of Pomelo cv. Huangjinmiyou in different planting areas
Authors: Yao Yuan , Xu Wenxin , Wang Jiaqi , Wang Bozhi , Tang Xiaoyu , Dong Tiantian , Xiong Bo , Sun Guochao , Liao Ling , He Siya , Wang Zhihui
Published: May 2020

In order to study the effect of different planting areas on the color of Pomelo cv. Huangjinmiyou fruit, Pujiang and Guang’an Pomelo cv. Huangjinmiyou were used in this experiment. Brightness, red and green deviation and blue and yellow deviation of exocarp, mesocarp and pulp parts in the test samples were measured, and the composite index of color difference was calculated. The results showed that the comprehensive index of color difference in the exocarp and pulp of Pomelo cv. Huangjinmiyou from the two planting areas changed almost synchronously. But it was negative at 90 days after anthesis and positive at 120 days after anthesis in the mesocarp of Pujiang pomelo. It was still negative at 150 days after anthesis in the mesocarp of Guang’an pomelo until 180 days after anthesis. It reflects the comprehensive index of fruit color displayed by the accumulation of carotenoids. The external environment stimulates the accumulation of carotenoids. Therefore, color variation difference may be caused by different environmental factors in the two regions.
Research on Lightweight Method of Ancient Building Information Model Based on WebGL
Authors: Wang Ru , He Jia
Published: May 2020

Aiming at the large amount of component data in the 3D dynamic display of the ancient building BIM model, which caused difficulties in information exchange during the protection of the ancient building, a lightweight method of the ancient building BIM model combining with WebGL and IFC standards was proposed. Using WebGL technology to extend the 3D visualization method of BIM models of ancient buildings, providing new technical support for the protection and research of ancient buildings. First define the JSON intermediate file, design the Revit-JSON data interface, make the model support .html and .js format, and improve the visual display method of the web side; use JavaScript to directly call the JSON interactive program of the underlying GPU to improve the web-side rendering effect of the model; Three.js framework realizes the display and interaction of 3D models of ancient buildings on the Web. Taking a typical ancient building as an example to carry out experiments, the method in this paper can reduce the storage volume by more than 70% on the basis of ensuring that the model information is complete, and has a good rendering effect in the browser. The experimental results verify the effectiveness and feasibility of the method.
Study on Interior Space Optimization of Green Affordable Housing in Cold Region
Authors: Dong Junyan , Zheng Bomin , Fu Yupi , Li Kechao
Published: May 2020

With the construction of a large number of affordable housing and the development of green buildings, the design of green affordable housing has become a new concern and research topic in China’s residential architectural design, and the interior design of affordable housing has become a top priority. This article takes Changchun city as an example, through the research of affordable housing in Changchun, visit, found the main problems existing in the status quo, in view of the problems put forward housing interior space design optimization principle, and according to the design principles of indoor space scale, provides a good green indoor living environment for green residential tenants in cold areas.
Experimental Test on Bridge Reinforcement by Enlarging Section-Prestress Method
Authors: Jia Li , Tao Liu , Hong Huang , Jian Jiang , Zhi Huang
Published: May 2020

This paper proposes the method of enlarging section combined with prestressed tendon (Enlarging Section-Prestress Method), which has the advantages of both increasing section and external prestressing, such as reducing section height, the prestressing tendon do not rust easily, and the appearance is beautiful. Model tests were carried out, two rectangular beam models with the same section and length were made, one was reinforced by Enlarging Section-Prestress Method, and no reinforced action was taken as a control. Two points of concentrated load were applied to the model beams, and the two tests were compared in terms of deflection-load characteristics and crack development. The experimental results show that the Enlarging Section-Prestress Method is effective, which improved the ultimate bearing capacity of the beam obviously, and reduced the deflection of the trabecular beam.
Experimental analysis and research on flexural properties of reinforced concrete composite beams
Authors: Xie Ruqiang , Hu Yuanchao , Shen Xiaopu
Published: May 2020

In order to further study the flexural properties of reinforced concrete beams after composite reinforcement, three composite beams and one cast-in-situ beam were tested under static load focusing on the bearing capacity, the law of crack development and the change of deflection. Test results demonstrate the yield strength, ultimate bending strength, and deflection of the composite beams are similar to those of the cast-in-situ beam, which confirms that the reinforced concrete composite beams can be used for reinforcement purposes in engineering projects.
Research and Analysis of Axial Compressive Properties of Concrete Columns Strengthened with Composited Fiber Cloth
Authors: Kun Zhu , Boshi Pang , Hangyu Luo , Wenjia Zhang , Ran Chen , Kai Wang
Published: May 2020

Paste fiber cloth reinforcement method is an important method in the current reinforcement project, and carbon fiber reinforced plastics (CFRP) and glass fiber reinforced plastics (GFRP) are the two most commonly used materials in the reinforcement method. CFRP have high tensile strength, high elastic modulus, and low elongation, while GFRP have lower tensile strength and elastic modulus, but high elongation. Studies have shown that the combination of two fiber materials can effectively improve the weakness of a single fiber material, make better use of the advantages of these two materials, and improve the comprehensive mechanical properties of the fiber material. Columns, as the main load-bearing components in the concrete structure system, have a significant impact on the stability of the building structure. By studying the influence of the combined fiber cloth on the compressive performance of the column, the optimal fiber cloth combination scheme was found out, which provides a reference for practical engineering applications.
Evaluation of Innovation Management of Major Projects
Authors: Liyu Xia , Xin Li , Weixuan Meng
Published: May 2020

It is of great significance to evaluate the implementation effect of major engineering innovation management and summarize the successful or failed experience of major engineering innovation management for the smooth development of major projects in the future. We select the representative Beijing Shanghai high speed railway project, Ultra-high voltage project, Three Gorges project and Ten major aircraft project as examples to summarize the methods and effects of innovation management of major projects, and build the evaluation system of innovation management of major projects from two main dimensions of innovation management mode and innovation management mechanism to visually evaluate the effect of innovation management of major projects. The research results show that the evaluation system proposed by us has good applicability to major project innovation management, and visual display can reveal the evaluation results more intuitively.
Seismic Analysis of Hybrid System Bridge of Multi-Span Continuous Girder and Arches
Authors: Mei Kuihua , Fu Wangwang , Su Jufeng
Published: May 2020

The Chengdong Hanjiang Bridge in Ankang City is a multi-span continuous beam-arch combination system bridge of (75+2×125+160+2×125+75) m, and its site is located in the earthquake zone. Calculation model based on Midas / Civil finite element software process analysis method is applied to seismic response analysis using power. At the same time, in order to influence the travelling wave effect and the seismic isolation system on the internal force of the bridge structure, corresponding finite element models were established and calculated with time history analysis. The finite element model under non-uniform excitation uses the “Large Mass Method” (LMM) for analysis and calculation under different wave velocity multi-point excitations. The results show that after considering the traveling wave effect, the displacement and bending moment of the control section of each hole increase, and the internal force of the fixed pier increases. When the wave velocity is 600m/s, the traveling wave effect strengthens the seismic response of the structure the most. With the increase of the wave velocity, the seismic response of the structure gradually approaches the seismic response under uniform excitation. After the friction pendulum seismic isolation support is used, it is fixed. The bending moment of Pier No.32 has been reduced by 80%, the stiffness of the whole bridge is more balanced, the forces of each pier are relatively close, and the isolation effect is good.
The seismic design suggestions of girder bridge
Authors: Li Hong
Published: May 2020

This article mainly analyses different representations of bridge seismic damage and their causes, discusses mostly the analytic means of bridge structures’ elastic-plastic earthquake response and the design method of ductile earthquake-resistance. In the end, the developing trends of the method in future are introduced, the suggestions of modifying the specification are given.
Research on the Arrangement Form of Net Suspenders with Constant Inclination Angle for Steel Box Tied Arch Bridge
Authors: Ma Teng , Zhao Jingkai , Mei Dafang
Published: May 2020

In order to explore the rational suspender layout of reticulated suspender steel box tied arch bridge, eight different suspender layout schemes were established by using finite element software Midas civil, taking a real bridge as the background and the constant inclination angle of suspender as the research variable. The structural stress characteristics of vertical suspender and reticulated suspender layout were analyzed and compared. The results show that the bending moment of arch rib and tied beam of reticulated suspender system is smaller, and the stress of arch beam is closer to the ideal state of “arch rib is compressed, tied beam is pulled”. The results show that in the range of 60 ~90, the smaller the inclination angle is, the more favorable the stress of the structure is, but the lower the moment reduction efficiency is when the inclination angle of the suspender is less than 60.
The Research of Plastics-Steel Fibber Content on the Mechanical Properties of Light weight Aggregate Concrete
Authors: Yunyun Li , Jiangang Niu , Baosheng Yang , Jingjun Li
Published: May 2020

In this study, lightweight aggregate concrete (LWAC) specimens with different plastics-steel fibre volumes were tested to investigate the effect of plastics-steel fibre fraction on the mechanical properties of LWAC through the experimental research and theoretical analysis. The experimental results indicated that incorporation of steel fibre into LWAC can greatly improve such mechanical properties as flexural toughness and impact resistance, but leads to a little effect on compressive strength and flexural strength.
Experimental study on bond performance between GFRP bars and concrete
Authors: Decheng Fu , Bo Wang
Published: May 2020

Based on 27 bonding test of pull-out specimens, the bonding performance between GFRP and concrete was studied systematically. The bond failure between concrete and GFRP includes four stages: microslip stage, linear slip stage, nonlinear slip stage and bond failure stage. The experiment shows that there is no significant correlation between concrete strength and bond strength, bond strength increases with the bond length and decreases with the increase of GFRP reinforcement diameter.
Construction Technology of Composite Cofferdam for Main Pier Bearing Platform of Dongjiang Lichuan Bridge
Authors: Wang Jianping
Published: May 2020

Dongjiang Lichuan Bridge in Dongguan City is a curved tower curved beam cable-stayed bridge with a main span of 138m and no back cable. The main pier cap is located on the bank slope of Dongguan Waterway on one side of Nandi Road. The cushion cap is dumbbell type, and the left and right cushion caps are connected by tie beams. In most areas, the top of rock stratum is above the bottom of bearing platform. The rock stratum within the buried depth of bearing platform is moderately to strongly weathered argillaceous siltstone. The geological conditions are complex and the construction is difficult. In line with the principles of speeding up the construction process and improving economic benefits, comprehensive analysis and weighing advantages and disadvantages, the main pier cap adopts a composite cofferdam of filling soil to build an island and combining bored pile rows and steel sheet piles. The construction task of bearing platform of main pier has been completed with high quality. Compared with other cushion cap construction methods, this construction method has the advantages of fast construction, high quality, simple safety, energy saving and environmental protection. This paper briefly introduces the design scheme of composite cofferdam, expounds in detail the operation steps of steel sheet pile construction and the problems needing attention in construction, and provides good reference experience for similar pile cap construction.
Macroscopic Fundamental Diagram based Road Network Characteristics Identification and Simulation
Authors: Yu Yi , Wang Liang , Mo Xianglun , Yu Yao , liu Mei
Published: May 2020

As an inherent property of the road network, macroscopic fundamental diagram (MFD) method can effectively describe the traffic status of the urban roads and identify the relationship among key factors, such as traffic flow and occupancy. Currently, using MFD is easily affected by various network inner factors including topology and road density, so in this paper we propose a method to identify inner characteristic of road network and do a series of comparisons under different scenarios with fixed traffic input circumstance. The differential impact of data collector setting locations are discussed with a aim to reveal the respective location setting suitable for various networks conditions in initial; then road topology and density are designed in road network and simulated MFD performances with flow equilibrium affections. It is shown as the dispersion decreasing of link length or road density of network, the network exhibits better operation efficiency so as to increase the output of link flow and the dissipative ability of the road network. Meanwhile, the equivalent of entrances and exits is proved as another important factor has same impact on MFD.
Research on Residential Building Design for the Elderly in the Aging Society
Authors: Zhang Hui
Published: May 2020

In the late 1990s, China has entered an aging society. In recent years, with the rapid development of economy and society, the speed of population of the aging is accelerating. The elderly are the wealth of the country. We should start with details to ensure the normal life and needs of the elderly. To study the problems related to the residential building design for the elderly, we must first make clear the related problems of the elderly, and then improve from the actual design process, and finally improve the quality of life and living of the elderly. This thesis focuses on the design of residential buildings for the elderly in the context of an aging society. Proceeding from the actual problems of the elderly, discussing the physical and psychological problems, the author analyses the problems in the design process and the principles to be followed, and finally proposes measures to improve the design level. It is hoped that the waste paper will further promote the development of residential building design for the elderly in the aging society.
Study on Green Highway Construction in Mountainous Hilly Area
Authors: Yao Ke , Li Mengyue , Fan Qingqing , Meng Xiangchen , Hao Guojun
Published: May 2020

The article takes the Shaoxin Expressway as an example. Based on the construction characteristics of the project, it analyzes the construction requirements for the green highway of the project. From the safe and ecological construction of the tunnel, the ecological safety guarantee in the environmentally sensitive areas, the expansion of the highway tourism functions, the wisdom monitoring of highway construction operations and other aspects, this article systematically analyzes the contents of green highway construction in mountainous hilly areas, and it can provide a technical reference for similar green roads construction projects.
Research on Implementation and Evaluation of Highway Green Construction
Authors: Yao Ke , Sun Zhichao , Li Mengyue , Fan Qingqing , Hao Guojun
Published: May 2020

This article analyzes how to implement green construction in highway construction around six aspects of highway green construction management, construction material saving, water saving, energy saving, land saving and environmental protection. According to the control and non-control work, this article studies how to evaluate the implementation effect of highway green construction from the aspects of sub-elements, sub-batches, sub-project categories and sub-stages. The proposed implementation plan, evaluation method and evaluation organization of highway green construction can provide technical reference for the implementation of highway green construction.
Air conditioning predictive control for rail transit vehicles based on load prediction
Authors: Zhao Yichen , Bi Haiquan , Wang Honglin
Published: May 2020

This paper proposes a predictive control method for rail vehicle air-conditioning systems. Due to heat transfer and diffusion, the air-conditioning system is a long-time-delay system. However, most air-conditioning systems use feedback control, which has problems such as long transition time, system shock, and mismatch between air cooling capacity and load, resulting in the waste of energy. Combined with feedforward and feedback control, a predictive control method with dynamic correction is proposed to solve this problem. Based on the load prediction, the real-time indoor temperature feedback link is added to send the cold air into the room in advance, which makes the room temperature stable, and the energy-saving effect significant. In the study, variance analysis of environmental factors is performed to improve the accuracy of the load prediction system, and the mean relative error (MRE) of the prediction reached 0.0112. By comparing the simulation results of predictive control and feedback control, it is proved that the predictive control with correction has a smoother room temperature curve. The energy-saving rate is about 25.2%.
Study on the improvement of indoor hot and humid environment in Tibetan-style residential areas in northwest Sichuan
Authors: Yidan Sun
Published: May 2020

Indoor and outdoor thermal environment is under a definite impact on the human body, and to a large extent affects the comfort of people living. In this paper, the indoor and outdoor thermal and humidity parameters of Dongma village in the west of Sichuan Province were measured. On the living room and bedroom hot and humid comfort survey, the outside wall temperature and the local climate to do analysis, get January Dongma village typical residential indoor humidity environment, including the temperature of the living room is 6.6~19.5°C, the relative humidity is 28.9~45.3%rH, the bedroom temperature is 3.5~19.8°C, the relative humidity is 35.7~52.8%rH, the outdoor temperature is 2.4~27.4°C, the temperature in the east is -11.1~-3.3°C, -3.9~11.2°C at the west, -8~2.8°C at the south, -10.4~-2.5 °C at the north, 1.6~29.2 °C at the roof, and the solar radiation intensity is 422~739W/m^2. Combined with the above data, it is found that the overall insulation performance of the wall is good, but by the influence of the cold weather outside, the indoor temperature is still low, it is difficult to respond to the comfort needs of residents. The wall temperature is altered due to solar radiation. In view of the current situation of the indoor thermal environment in Dongma village, a series of optimization suggestions are submitted at the end of the paper.
Research on the Development and Utilization of Underground Space in Small and Medium-sized Cities in East China Based on Case Studies
Authors: Gao Zhinan , Liu Wanfeng , Li Xusheng , Wei Yun
Published: May 2020

The development and utilization of underground space is an effective way to solve the shortage of urban space capacity. It is also an inevitable choice for the sustainable development of urban underground space. The development and utilization of underground space in small and medium-sized cities in China started relatively late and lacked practical basis. This paper selects three representative small and medium-sized cities in east China to study the status quo, contents and achievements of underground space development and utilization, makes a comparative analysis, and puts forward the overall characteristics of underground space development and utilization in small and medium-sized cities, hoping to provide reference for the development and utilization of underground space in small and medium-sized cities in the future.
Effect of Organic Montmorillonite on Properties of High-viscosity Modified Asphalt
Authors: Guo Yongmei , Jie Yadong
Published: May 2020

In order to investigate the effect of organic montmorillonite (OMMT) and its content on properties of high-viscosity modified asphalt, a series of laboratory tests were carried out through zero shear viscosity (ZSV) at 60 °C, rutting factor, ductility at 5 °C, and fatigue factor to analyze high-temperature, low-temperature and anti-fatigue properties of high-viscosity modified asphalt with different OMMT contents. The results show that OMMT/high-viscosity modifier (HVM) composite modification can improve obviously high-temperature performance and fatigue resistance of high-viscosity modified asphalt, but the best improvement effect can be achieved only when adding proper amount of OMMT. The addition of a small amount of OMMT has little effect on low-temperature performance of high-viscosity modified asphalt, but when the content of OMMT exceeds 4%, its low-temperature performance will decrease significantly. The addition of OMMT can improve the temperature sensitivity of high-viscosity modified asphalt’s high-temperature performance, but reduces the temperature sensitivity of its fatigue resistance.
Application status and problems of machine-made sand in Highway Engineering
Authors: Songhua Wu , Xiangzhen Wang , Lianghua He , Yandong Kong , Yuliang He
Published: May 2020

Based on the investigation of the application of machine-made sand in Shaoxing, Zhejiang Province, this paper analyses the supply and demand of local machine-made sand, combined with the application of machine-made sand in highway engineering projects such as Hangzhou Shaoxing Taizhou expressway. It discusses the problems existing in the current machine-made sand industry, such as slow overall application, uneven quality and low application of high-grade concrete, and puts forward many measures to promote high-quality machine-made sand. In the application of high-grade concrete, it is suggested that the government should develop the machine-made sand market jointly with many departments, increase efforts to crack down on the inferior sand, cultivate the high-quality machine-made sand market, and improve the engineering quality of the machine-made sand concrete.
Dynamic response analysis of the integrated station-bridge elevated station under the pile-soil interaction
Authors: Zhang Shuqi , Li Jin , Li Jingyuan , Zhang Jiaolei
Published: May 2020

In order to study the dynamic response of the integrated station-bridge structure under the pile-soil interaction, a model was established by finite element software for dynamic analysis. According to a practical project, two mechanical models are established: one is the pile-soil interaction model, the other is the rigid foundation model. The dynamic responses of the two models were analyzed respectively, and then the results were compared. The results show that: the structure with pile-soil interaction has a longer period and higher flexibility; Under the action of frequently occurred earthquakes, the maximum displacement of the structure with pile-soil interaction increases and the base shear decreases; Under the action of seldomly occurred earthquakes, the structural displacement and base shear under the pile-soil interaction become larger, and the transverse displacement is more affected than the longitudinal displacement. It is concluded that: the assumption of rigid foundation makes the result more conservative, and the influence of pile-soil interaction cannot be ignored in seismic response analysis.
Design and Engineering Application of Polymer Grouting Pore Layout Scheme for Expressway Pavement Diseases
Authors: Tao Liu , Zhigang Zheng , Shaoyou Hong , Zhi Huang , Yintan Wu , Hong Huang
Published: May 2020

In grouting technology, after choosing the type of grouting fluid needed for grouting, the next most important step is the layout of grouting holes, that is, grouting hole type and hole spacing. Reasonable arrangement of grouting holes and hole spacing can not only achieve the desired reinforcement effect, but also save unnecessary economic expenses. For this reason, the effective diffusion radius of slurry is firstly determined considering both the characteristics of polymer slurry and the pore structure of injected medium. Based on this, the distance between holes (triangular and rectangular) is determined. Finally, the grouting design parameters of this design scheme are applied to the disease area of Nanping Expressway in Shenzhen. The deflection value before and after grouting is detected by falling weight deflectometer (FWD). The results show that the grouting design parameters can achieve better grouting effect.
Test Research on Progressive Collapse Resistance of Aluminium Alloy Honeycomb Panel-rod Composite Latticed Shell
Authors: Wang Zhewen , Zhao Caiqi
Published: May 2020

In order to study the progressive collapse resistance of the panel-rod composite latticed shell, a static test was performed on two latticed shells with the same size, one of which was removed a key member. The results of experiments and numerical simulations show that the composite reticulated shells were damaged due to the fracture of some members and the shearing of some rivets. Compared with the complete latticed shell, the bearing capacity of the latticed shell which was removed a key member did not decrease too much, but its displacement of the joints increased significantly. The phenomenon indicated that the removal of the key member had a certain effect on the progressive collapse resistance of the composite latticed shell. The key members of the composite latticed shell must be locally strengthened.
Research on influence of welding root node coupling on welding deformation of large mining dump truck frame
Authors: Xie Heping
Published: May 2020

Taking the frame of large-scale mining dump truck as the research object, it established the model of coupling or not of T-joint welding root by the finite element analysis, and analyzed the deformation of coupling or not of T-joint welding root. The deformation trend of the two cases is the same, which verifies the correctness of the prediction results of deformation. The results show that the maximum deformation occurs at the arc starting welding of the vertical plate, and the error between the simulation results and the test results is small. At the same time, the deformation error of gantry frame and hinge-hole at the key position can meet the production requirements, which is of great significance to the field production.
Fracture analysis and countermeasures of the grid switch castings
Authors: Feng Chao , Yang Siyuan , Li Qiao , Zhou Mengbao , Wu Songqi , Hu Jiarui , Xie Yi , Wang Wun , Long Yi , Liu Weike
Published: May 2020

Based on the detection technology of direct reading spectrum, metallographic microscope and X-ray, the defects of the grid switch castings were analyzed. The four main forms of casting fracture were summarized as poor physical and chemical properties, material misuse, casting defects and designing defects. In order to strengthen the quality control of the source of the product, it was proposed to carry out targeted network inspection in the two stages of material arrival and infrastructure acceptance.