bluuebunny/crossref_metadata_2025 huggingface dataset:
Cloning and Expression Analysis of δ-OAT Gene from Saccharum spontaneum L
Authors: Yao Yanli , Xu Lei , Hu Xiaowen , Liu Yang
Published: April 2020

Full-length cDNAs of ornithines-δ-aminotransferase (Ssδ-OAT) were isolated from Saccharum spontaneum through homologous clone strategy. The sequence of this gene was then deposited in GenBank database with the accession number KX714115. Sequence analysis showed that the full length of the δ-OAT gene was 1373bp, the open reading frame was 1365 bp, it was inferred that coding 454 amino acids, the isoelectric point and the molecular weight of coded protein were 6.16 and 49.5 kD, respectively. According to the phylogenetic tree, the evolution of Ssδ-OAT corresponds with traditional biological classification. Its functional domain has a high conserved property in the process of biological evolution. Prokaryotic expression vector pEASY-E1-Ssδ-OAT was established and transformed BL21 (DE3) into E. coli after IPTG induction, showing a successful gene expression. The expression pattern analysis carried out by quantitative real-time PCR indicated that the gene expression level was significantly up-regulated under drought stress. The relative expression of the gene reached to the maximum under 6d treatment. It was the first time to obtain δ-OAT from Saccharum spontaneum L, Ssδ-OAT responded to water stress, it was inferred that δ-OAT played a role in resistance to osmotic stress.
Simulation Research of BD Satellite Navigation Based on MATLAB
Authors: Chang Tong
Published: April 2020

This paper studies and analyzes the key technical principles of BD2 satellite orbit modeling. It uses MATLAB to design and simulate the satellite constellation and satellite positioning principle of Beidou. It can display the selected orbit and the satellite used for user positioning. It realizes the simple carrier motion modeling and studies the ionospheric delay correction model. Through the testing and analysis of the key technologies of the system, it shows that the system can realize the navigation and positioning function, which has practical value.
Geodetic Line Interpolation Algorithm with Absolute Precision Threshold Constraints
Authors: Dong Jian , Li Binbin , Peng Rencan , Chen Yang
Published: April 2020

The existing geodetic line interpolation algorithm mainly has the following problems: first, the map projection property and the limitation of the scale size can not be separated from the chart carrier; the second is that the maximum interpolation interval needs to be given artificially, and the third is that the precision of the algorithm results can not be adjusted adaptively. Aimed at the above problems, in this paper, in this paper, the length of the earth spherop corresponding to the replacement of the geodetic line by the space linear line is calculated according to the curvature of the earth, and it was taken as the maximum interpolation interval so that a geodetic interpolation algorithm with absolute precision threshold constraint was proposed in this paper, too. The correctness of the algorithm and the precision of the results are verified experimentally by using the classical example, and the results show that the algorithm can not only adjust the maximum interpolation interval adaptively according to the absolute precision threshold, but also improve the absolute precision of the results, and also has wide applicability to the distance of geodetic line.
The retrieval of atmosphereric water vapor based on Beidou Ultra-rapid precise ephemeris using different mapping functions
Authors: Guo Qiuying , Hou Jianhui , Wu Xuxiang
Published: April 2020

The atmospheric mapping function is an important model to convert the total tropospheric delay on the slant path of satellite signal into the zenith tropospheric delay. It is important to choose the appropriate mapping function to improve the accuracy of water vapor estimation. Beidou observation data in different seasons from 6 MGEX stations were processed using GAMIT 10.7 software. Three mapping functions (NMF/GMF/VMF1) were used in the estimating the atmospheric precipitable water vapor (PWV) based on Beidou Ultra-rapid precise ephemeris. The results of PWV/BDS were compared with the PWV/GPS. The experiments showed that the average bias between PWV/BDS and PWV/GPS is about 1-5mm. The GMF mapping function is slightly better than NMF and VMF1 in the retrieval of atmosphereric water vapor.
Three Dimensional Information Sharing Platform of Power Transmission and Transformation Based on Grid Information Model (GIM)
Authors: Lin Shaoyuan , Zhong Tianrong , Yu Xinmin , Luo Weichao , Lv Jinglei
Published: April 2020

Grid information model (GIM) is a technical standard formulated by State Grid Corporation of China to meet the needs of three-dimensional design of power transmission and transformation projects [1]. According to the characteristics of GIM data, this paper studies the design of distributed computing technology and service architecture to realize the online analysis and optimization of GIM data, so as to improve the efficiency and performance of GIM data analysis. Based on WEBGL technology, with the help of 3D tiles’ LOD ability and the openness of format, a 3D information sharing platform for power transmission and transformation is built to realize the efficient and smooth loading, display and sharing of GIM 3D data on the web.
Study on the selection and optimization of key elements in the offshore wave prediction
Authors: li Dongzi
Published: April 2020

The accuracy of inshore wave prediction is closely related to the key elements selected in the prediction. There is a problem of selecting and sorting the key information needed in wave forecasting. This paper combines AHP with DEA to build a new evaluation model of selecting scheme. By calculating the relative weight of the key information in each selecting scheme and calculating the relative efficiency value of the model, the importance sorting of the elements needed in wave forecasting is obtained, and the specific selection scheme is verified by an example Application. The established AHP-EDA model has the value of trial and extension in supporting the key element selection process of wave prediction.
A new remote sensing image fusion method combining principal component analysis and curvelet transform
Authors: Chen Chao , He Xinyue , Chu Yanli , Zhao Xin
Published: April 2020

In the framework of multi-scale decomposition, a new multi-source image fusion algorithm based on principal component analysis (PCA) and curvelet transform is proposed for pixel-level image fusion. Firstly the low-resolution multi-spectral image is transformed by PCA and principal components are obtained. Secondly the high-resolution image and the first three principal components of the multi-spectral image are respectively merged with curvelet transform and finally the fused image is obtained by inverse PCA transform. This method gives the results of fusion and is compared with the traditional method of PCA, which proves the effectiveness of the method.
Metallogeny of the Maoping graphite deposit,Sichuan Province
Authors: Wan Pingyi , Peng Zhaoqiang , Wang Guanghong , Zhou Yong , Yang Yongqiang
Published: April 2020

There are abundant crystalline graphite resources in Panzhihua area. Large and medium-sized deposits are mainly distributed in Renhe District and Miyi County of Panzhihua City, and their genetic types are sedimentary and metamorphic. The ore-bearing rocks of graphite deposits in Renhe area are mica quartz schist of Lengzhuguan Formation of Kangding Group of Early Proterozoic, while the ore-bearing rocks of graphite deposits in Miyi County are sericite phyllite of the first member of Tianbaoshan Formation of Huili Group of Mesoproterozoic, with a slightly later stratigraphic age and a slightly lower metamorphic degree. Therefore, a thorough study of the genesis and metallogenic regularity of graphite deposits in Miyi area is of great guiding significance to the search for similar types of graphite deposits in Panxi area.
Discussion on Road Reflection Crack and Control
Authors: Zhao Huifang , Li Hongbo
Published: April 2020

This paper focused on the problems encountered in the road construction of a coal-fired power plant in the Philippines as an example. Some cracks and damage appeared in the roadbed after the road concrete base layer has been built. If the concrete wearing course layer is poured on the old roadbed without dealing with the crack problem, some reflection crack will occur. This paper conducted a series of explorations on how to control the influence of reflection crack on concrete road wearing course layer and provides a variety of solutions to control the occurrence of reflection crack. The paper is expected to provide solutions to control reflection crack on concrete road.
Research on Water Inrush Disaster Control Technology in Double Shield TBM Excavation Process
Authors: Jiao Zhang , Shiqun Liu , Jianwei Zhang , Yan-xu Guo , Xin Chen
Published: April 2020

Taking the TBM water inrush accident in An-Xue section of Qingdao Metro Line 1 as the engineering background, the research is carried out from two aspects of TBM water inrush emergency measures and grouting reinforcement treatment technology, which can ensure the strength of stratum reinforcement and water shutoff, and at the same time prevent the slurry from damaging the cutter head. For different areas, the grouting construction technology is proposed. After the reinforcement, the water stopping effect is obvious, the water inrush point has no water flow out, the hole drilling effect is good, the core removal rate is 75%∼85%, and the strength meets TBM excavation requirements.
Reliability Analysis of Arch Dam Based on Optimized Complex Method: a Case Study of Shapai Arch Dam
Authors: Sun Tao , Chen Yuan , Wang Senhao , Yang Baoquan
Published: April 2020

The research on crack development and reliability index is very important for roller compacted concrete (RCC) arch dam. There are many methods for studying reliability of a structure, such as JC method or finite element method. But it is inevitable to take derivatives of complex functions in this method. However, the complex method can avoid this problem. Therefore, the optimized complex method is applied to the study of the distribution law of the reliability index of Shapai high RCC arch dam. And the possibility of dam cracking and failure are further analysed based on the calculate results. The research results provide the basis for the safety of Shapai arch dam and also provide reference for other similar arch dams.
Design and Study of Intensive Track Laying System for Single Hole and Double Road in Open Cut Station
Authors: Li Ningning , Zhang Chunyu , Liu Shiqun , Xie Chao , Li Chao
Published: April 2020

This paper takes Qingdao subway station as an example, considers reducing the cycle of track laying on the whole line, and adds rails and wells under the existing envelope structure. The single-track row of wells and a double-line entrance to the crossing are proposed. The analytical calculations and numerical simulation methods were used to check the mechanical condition of the station envelope and the main structure of the station under the rails. The research results show that the track laying base can be laid out in the enclosed open excavation station, and a series of problems such as land occupation coordination have been solved, and the period benefit is significant. This scheme can ensure the structural safety before the entrance of the rail row well is closed, and the position of the rail side frame below the middle plate of the station satisfies the requirements of the laying limit. This method has a novel design idea, has high application and promotion value, and provides a good reference for the design and construction of open-cut subway stations.
Study on application of gypsum-based self-leveling mortar in floor heating backfill
Authors: Zhang Jixiu , Zhang Ye , Liu Jikang , Miao Yuanchao , Duan Saihong
Published: April 2020

In this paper, gypsum-based self-leveling mortar is prepared by using desulfurization gypsum-based α-high strength gypsum as the main cementing material, and it is applied to the floor heating backfill. Comparing with cement-based self-leveling mortar, the thermal conductivity coefficient, thermal expansion coefficient, elastic modulus and other performance indexes of gypsum-based self-leveling mortar are studied. The results show that the gypsum- based self-leveling mortar prepared based on α-high strength gypsum has high strength and heat conduction. Good physical performance, good volume stability, low thermal expansion rate are suitable for floor heating. The application of the gypsum-based self-leveling mortar in the floor heating project shows that the gypsum-based self-leveling mortar can simplify the construction process and shorten construction time.
Effect of cement particle size distribution on properties of cement mixed with polycarboxylate superplasticizer
Authors: Lai Guangxing , Fang Yunhui , Chen Zhanghua , Shao Youzhe , Guo Yuanqiang
Published: April 2020

The particle size distribution of cement under different milling time was studied, and the effects of different particle size distributions on the polycarboxylate superplasticizer dosage of the paste and the bleeding property of the paste were researched, and the early hydration exothermic rule of cement was investigated with the hydration heat meter. The results show that with the increase of ball milling time, the particle size distribution of cement is close to the direction of small particle size. With the same paste fluidity, the dosage of polycarboxylate superplasticizer increased and the bleeding rate of cement paste decreased with the increase of cement fine particle components. Under the same condition, with the increase of cement fine particle content, the hydration reaction speed is accelerated and the degree of hydration is relatively high.
Study on the application of laser particle analysis in the test of geotechnical particle analysis
Authors: Xuekui Wang
Published: April 2020

In recent years, laser particle analysis method is a new method in geotechnical particle analysis. In this paper, through the particle analysis test of typical soft soil, the differences and control parameters between it and densimeter method are compared. The main conclusions are as follows: (1) the light shading percentage should be controlled between 5% and 20%;the concentration of dispersant (sodium hexametaphosphate) should be 0.04%;the circulating speed of centrifugal pump should be controlled between 1200-2000 RPM. (2) Compared with densitometer, the content of colloidal particles (< 0.002mm) and sand particles (> 0.075mm) measured by analysis method is different, and the content of clay particles (< 0.005mm), silt particles (0.005-0.075mm) and D50 is basically the same.
Study on self-healing performance of basalt fiber asphalt concrete in road environment
Authors: Yan Jingchen , Li Hanxiang , Shen Li
Published: April 2020

Load crack is one of the main failure forms of asphalt concrete pavement. Basalt fiber has become an important research direction of road fiber modifier. However, the self-healing performance research of basalt fiber asphalt mixture under different road environment factors are rarely. In this paper, the self-healing performance of asphalt pavement in different road environments is studied by combining the self-healing properties of asphalt and the crack resistance of fiber materials. The self-healing test of basalt fiber asphalt concrete was carried out after long and short aging, ultraviolet aging, snow melting and freeze-thaw cycles treatment. By using the damage rate as the evaluation index, the self-healing characteristics of basalt asphalt pavement were analyzed by the method of “fatigue-self-healing - fatigue” under the influence of different road environment. The experiment also compared the self-healing properties with SBS modified asphalt and matrix asphalt and explained the mechanism of basalt fiber mixture self - healing by electron microscope. The results show that the addition of basalt fiber can greatly improve the self-healing level of asphalt concrete under various road conditions.
Monotonic triaxial shear strength and cyclic triaxial properties of undisturbed soft soil
Authors: Li J S
Published: April 2020

The static and dynamic characteristics of Tianjin coastal soft soil are researched by cyclic triaxial test. For triaxial shear test, the specimens are isotopically consolidated under initial pressures of 100 kPa, 200 kPa, 300 kPa and 400 kPa, respectively; for the dynamic triaxial test, the specimens are consolidated under initial isotropic consolidation pressures of 100, 200, 300 kPa, respectively. The applied dynamic displacements are graded for each specimen, and the pore-water pressure is completely dissipated before application of next displacement amplitude. These tests show that the effective cohesion is 6 kPa and the effective internal friction angle is 26.5 degrees under consolidated undrained condition. The maximum shear modulus of soil is related to effective confining pressure, and its relationship with effective confining pressure can be expressed by Janbu’s formula. The shear modulus of soil is related to shear strain and decreases with the increase of shear strain. Hardin-Drnevich can be used to normalize the shear modulus.
Improvement of Defects in ZYFM type oil-water separator
Authors: Li Jun , Zhu Yuhua
Published: April 2020

the working principle and automatic control principle of ZYFM type oil-water separator are analyzed. It is found that the design of this type of oil-water separator is defective, which is easy to cause the crew to intentionally discharge excessive oily water. By improving the control circuit and changing the open three-way valve of the gas installation, the design defects are eliminated, and the phenomenon of the crew’s malicious discharge of excessive oily water is eliminated.
Reinforcement scheme design for geotechnical slope engineering
Authors: Wang Weiguang , Li Wan , Su Lihai , Zhang Ao , Chen Longfei
Published: April 2020

With the continuous development of western mountainous areas and the deepening of infrastructure construction, geotechnical slope has become an engineering problem that cannot be ignored in the process of construction and using. Due to its universality and great harm of accidents, it has become a hot spot that engineers and researchers pay more attention to. It is of great significance to strengthen the stability of geotechnical slope.There are mature theories at home and abroad, but the actual engineering geological conditions are complex, the combination of theory and practice still needs to be explored. Combined with the slope engineering of an airport in the loess plateau area, the engineering geological conditions and the current situation of the slope were firstly introduced in this paper, then the stability checking was carried out under natural working condition and heavy rain condition respectively. The slope reinforcement was carried out for Scarp 1 and Scarp 2, respectively. This paper is of great help to further understand the principle of slope engineering reinforcement and can provide experience for slope reinforcement under similar working conditions.
Study on Constitutive Relations of Unsaturated Sand
Authors: Zhang Weihua , Zhao Chenggang , Gao Yanhua
Published: April 2020

The development of a coupled hydraulic-mechanical bounding-surface constitutive model for unsaturated sand based on phase transformation state. The key point of the model is the state parameter which is introduced based on the phase transformation state considering the fabric change effects, and with the Soil-Water Characteristic Curve and taking into account of the hydraulic-mechanical coupling effects, a bounding-surface model is established. The model has smooth transition between unsaturated state, saturated state and dry state. The model parameters are easily calibrated via common triaxial tests and some other simple tests.
Experimental Research on the particle composition of flowing mud in Shenzhen Port
Authors: Zheng Airong
Published: April 2020

Based on the particle analysis, mineral composition analysis and chemical composition analysis of the flowing mud in Shenzhen port, it is found that the flowing mud in Shenzhen port has fine particles, a lot of colloidal particles, and an obvious increase of colloidal particles after salt washing. The clay mineral content is large, and the highest content is I/M mixed layer, which makes the flowing mud have higher plasticity, greater compressibility and lower permeability. The content of Cl− and Na+ +K+ in the mud of Shenzhen port is high, which belongs to Cl− -Na+ type, which has strong corrosiveness to steel and medium corrosiveness to concrete .
Experimental study on improving red clay with sand at the foot of mountain
Authors: Fu Jianbao , Lang Zhaobin , Zhang Jiaying
Published: April 2020

There is a large amount of red clay along a highway under construction in Southwest China. The red clay has high plasticity and small CBR which don’t meet the specification. This paper studied on red clay improvement by adding sand at foot of mountain. Research results show that the dry density of the improved red clay increases with the increase of the sand when the moisture content is the same. The optimum moisture content of improved red clay decreases with the increase of the sand. The maximum dry density increases with the increase of the sand. Liquid limit and plasticity index decrease after adding the sand. The CBR increases after adding the sand. The sand mixing ratio 4:6 was recommended to use in actual construction. And properties of improved red clay filler with the recommended ratio in actual construction meet the specification. Project implementation effect is very good.
Experimental study on compressive properties of round steel tube recycled concrete columns
Authors: Ye Jianfeng , Luo Caisong , Chen Huayan
Published: April 2020

In order to study the compressive performance of circular steel tube recycled concrete columns, four circular steel tube recycled concrete columns are designed and manufactured, and subjected to a monotonic static compression test. Consider the eccentricity and the slenderness ratio, this paper observes the whole process of the specimen and the failure mode, and analyses the ultimate bearing capacity, deformation curve, load-deformation relationship, and load-strain relationship. The experimental research shows that the failure process and failure mode of the round steel tube recycled concrete column are similar to those of the ordinary round steel tube concrete column. Similarly, the bearing capacity of the test piece decreases with the increase of the slenderness ratio and eccentricity, and the ultimate failure form is mainly the overall instability failure.
Geomorphological indicators of karst environmental disturbance in the mountainous region of Jinan City, North China
Authors: Guo Jiamei , Jia Rong , Qi Shanzhong
Published: April 2020

As one of cities located in the karst region of North China, Jinan City is a karst region that is heavily urbanized in recent years, but no study has been undertaken to monitor the disturbance of karst environment. To effectively address the threats and the disturbance to karst region in the city, this study proposes hierarchal and standardized environmental disturbance indicators as a tool to monitor regional impacts and strengthen more protection of the karst mountainous areas in North China. The geomorphological indicators of karst disturbance in Jinan City of North China include quarrying or mining, and flooding and storm- water drainage (human-built surface structure indirect effect).
Formation Lithology Identification Technology along Railway in Complex and Dangerous Mountainous Area Based on Hyperspectral
Authors: Cai Jianhua , Wang Lijuan , Huang Yongwei , Chen Dayang , Liu Huan
Published: April 2020

In view of the difficulties during implementation of conventional survey methods for railway projects in complex and dangerous mountainous areas, the section from Maoxian to Songpan in Chengdu-Lanzhou Railway with complex terrain and bad climate is selected as the research area to extract hyperspectral remote sensing technology content of the research area. Based on the research of indoor hyperspectral image processing, outdoor rock sample collection and indoor spectrum analysis, establish a suitable feature extraction and lithologic recognition classification method according to the unique spectrum integration feature of hyperspectral remote sensing image. Use the visible short wave infrared hyperspectral data of the latest domestic Gaofen-5 satellite, carry out the lithologic plotting experiment in the key areas of the section from Maoxian to Songpan in Chengdu-Lanzhou Railway, and make accuracy evaluation by selecting a certain way for the mapping results. It provides important thematic information for regional lithologic investigation, and provides strong technical support for selection, survey and design of Chengdu-Lanzhou Railway construction, which is helpful for similar projects.
Underwater topography survey and precision analysis based on depth sounder and CORS-RTK technology
Authors: Song Fucheng , Gong Shumin , Zhou Ruichen
Published: April 2020

Underwater topography survey is a basics part of hydrological research, and plays an important role in the development of resources in marine lakes and inland rivers. In this paper, the water depth was measured in some waters of Linyi Beng river by using Real time kinematic (RTK) based Qianxun Continuously Operating Reference System (CORS) services and depth sounder, and the underwater topographic map was obtained. In order to test the accuracy of underwater topographic survey, some of the checkpoints were simultaneously observed by the traditional sounding rope method, and the sounding accuracy of these checkpoints was analyzed. The results show that the average accuracy of the sounding with the CORS-RTK+ sounder is 0.12m, compared with the traditional method, which satisfies the accuracy requirements of underwater topography. On this basis, the items that need attention during the practical sounding are given. The above research results can provide a technical reference for underwater topography survey.
The characterization method and effectiveness research for crack parameters in Tight Sandstone Reservoir
Authors: Long Yuan , Husong Ling , Qian Wang , Siyi Wu , Chuang Han , Bin Yu , Cai Chen , Fan Yang
Published: April 2020

When natural cracks in oil & gas development of tight sandstone remain valid, effective crack degree is the decisive factor of reservoir enrichment and high production. Taking the reservoir of the Bashijiqike Formation in Kuqa depression, Tarim Basin as an example, the crack parameters were characterized by a mathematical model and algorithm, which lays a theoretical foundation for the study of crack validity. According to crack parameters processed by electric imaging and static modulus date of rock mechanics, control conditions that constrain crack development such as crack permeability, the normal stress on crack surface and the angle between maximum principal stress and crack strike were obtained. In addition, quantitative expressions between constraints on crack development and productivity were established and the main control factors of fracture validity were confirmed. In the end, the crack development degree and effectiveness were comprehensively evaluated.
Hydroclimatic and geothermal controls of lithium brine deposits on the Qinghai-Tibetan Plateau
Authors: Gao Chunliang , Yu Junqing , Min Xiuyun , Cheng Aiying
Published: April 2020

The paper focused on the distribution characteristic, material source and ore-forming mechanism of lithium brine deposits on the Qinghai-Tibetan Plateau, and established the lithium brine deposit model. The results showed that all lithium brine deposits are controlled by the Neotectonics, enclosed/semi-enclosed low catchment basin and hyper-arid climate conditions, and related to the Cenozoic hydrothermal activities. The ore-forming materials especially lithium element are derived from volcanic rocks, which migrated and concentrated after water-rock interaction by hydrothermal springs and atmospheric precipitation.
Hoisting beam construction technology for Moon Bay Bridge
Authors: Yang Minghu , chen Lu , Liu Yuancai
Published: April 2020

In the construction of the main beam of the PC plate type stiffening beam suspension bridge, the problem of stiffening beam hoisting construction, combined with the Moon Bay Bridge, introduces the hoisting construction of the stiffening beam. The bridge is equipped with a lifting platform and a cable hoist is used to hoist the stiffening beam. The problems in the field tension construction were introduced. The hoisting of the Moon Bay Bridge was successfully completed, and its construction method can provide reference for similar bridge construction, which has certain reference significance.
Effect of diatomite with different morphologies on the purification guide performance of formaldehyde in Jilin Changbai area
Authors: Liguang Xiao , Hongyang Kou , Xixu Liu
Published: April 2020

In this paper, diatomite with different shapes (discoid, cylindric and scaphoid) was purified and characterized by SEM and BET. Then diatomite purification materials were prepared and formaldehyde adsorption test was carried out. The results showed that the pore structure of the purified diatomite was improved and the impurities were eliminated effectively. At 48 hours, the formaldehyde purification rate and the formaldehyde purification persistence rate of the diatomite purification materials with different shapes were different. The purification rate of the discoid diatomite purification materials to formaldehyde was 76.67%, the formaldehyde purification effect lasted 58.18%, the formaldehyde purification rate of the scaphoid diatomite purification materials was 85.45%, and the formaldehyde purification effect lasted 69.83%, the formaldehyde purification rate of cylindric diatom purification material is 88.89%, and the lasting rate of formaldehyde purification effect is 77.10%.
Analysis on project management of military barracks in high altitude area
Authors: Liu Chang , Xiao Bin , Wang Weijie
Published: April 2020

The construction conditions of engineering projects in high altitude areas are poor, the construction period is short, the transportation distance is long, the natural environment is bad, and the buildings are seriously damaged. The application of mature construction technology is greatly restricted. The contradiction between engineering construction and environmental protection is extremely prominent. The project management has special geological conditions, harsh natural conditions, short construction time, lack of technical equipment, weak support force and lack of information technology. It is necessary to strengthen the organization and management, do a good job in planning and design, scientific organization of construction, strict process supervision, optimization of personnel, application of information technology, and improve the quality and efficiency of management of military barracks project in alpine and high altitude areas.
Electromagnetic scattering from perfectly conducting periodic rough surfaces using discrete two-level complex images method
Authors: Li L , Xu J
Published: April 2020

The one-level complex image method is only useful in deriving the spectral-domain Green’s function at low frequencies. In this paper, a two-level complex image method is proposed to derive closed form periodic Green’s function at high frequencies for problem of scattering from perfectly conducting periodic surfaces. The remaining quotients in the spectral domain are approximated by a finite series of exponential using the Generalized pencil-of- function method. The approximation is performed along the two-level path, with this scheme the contribution beyond T0 has been considered and it will give accurate results over a wide frequency range. The results are compared with those obtained by the spectral Kummer- Poisson’s method and good agreements are observed. Also the complex image method is more computational efficient.
Main Structure Design and Constructional Safety Control of Large-span Gravel Surrounding-Rock Tunnel
Authors: De-kang Li , Hao-ran Li , Zuo-lin OuYang , Zhi-guo Yue , Yan-dong Dong
Published: April 2020

As the construction of large-span gravel surrounding-rock tunnel is very difficult which has serious security risks, it is significant to choose a set of reasonable structure design methods and safety control schemes. This paper taked a large-span gravel road tunnel in Jinan Expressway as an example. Through combining theoretical analysis with numerical simulation, the main structure design process of the large-span IV level surrounding-rock tunnel was divided into four steps, meanwhile concrete measure basis and testing methods were given. According to the engineering geological conditions and the structure design schemes, the construction schemes and monitoring measurement projects of large-span gravel surrounding-rock tunnel were determined to ensure the safety of tunnel construction. This paper provides a complete example scheme for the design and construction of the main structure of the large-span IV class surrounding-rock tunnel, which provides a reference for similar projects in the future.
Application of Projection Pursuit Model to Water Resources Carrying Capacity Assessment in Longitudinal Ridge-gorge Region of Yunnan
Authors: Chen Jinming , Gu Shixiang , Du Xuanxuan , Chen Gang , Hong Jinshu
Published: April 2020

Water resources carrying capacity (WRCC) assessment is an effective way to evaluate the coordinated development of water resources, economic society and ecological environment, thus, it is significant to study WRCC to realize the harmony among water resources, economy and society in region. In this paper, an index system for evaluating WRCC was constructed from the perspective of water quantity and water quality. Moreover, the projection pursuit technique was applied to evaluate WRCC. Based on the grade division standard of WRCC, the projection function which could reflect the variability of the WRCC was constructed, and genetic algorithm was introduced to optimize the function and seek the optimum projection vector, while the projection pursuit model to evaluation of WRCC was built by the data of the vector. WRCC of the 80 counties in Longitudinal Ridge-gorge Region of Yunnan was evaluated by this model, and the results which accord with the fact were gained. The result showed that WRCC is dynamic with evaluation index value was presented as the logistic curve. The WRCC in research region was good overall, but that in three counties and four counties was already in overload and nearly overload, respectively. Potential of WRCC in mid and western of research region was higher than the other area. The evaluation results were given with continuous real number, which could reveal the temporal-spatial change characteristics of WRCC accurately. Evaluation model of WRCC based on projection pursuit model was practical and feasible for dynamic evaluation of regional WRCC.
Rain gauge improvement and the comprehensive effect of hydrological calculation on water resources protection
Authors: Qi Haiyue
Published: April 2020

Water is the basis of human survival. With the rapid development of the society and economy in China in the new era, people have been concerned about the efficiency of water resources utilization. Hydrological calculation dose good to water conservation and predict future circumstance of using water such as droughts or floods in agriculture, industry, and daily life. The water resources protection mentioned in this paper involves rainfall and water consumption, water quality, satisfaction with water supply time of residential water, water waste and pollution and so on. Water quantity forecasting, water quality pollution and treatment include various factors and multiple aspects. The existing natural rainfall method of hydrological stations is to use artificial or computer to read the rainfall scale on the rainwater bottle, and measure the rainfall depth within the specified time period. This method serves as the basis for subsequent hydrological calculations and provides a guarantee for further prediction of water quantity calculation.
A study on Logistics Service Quality in E-Retailing Amongst Online Shoppers in Kuala Lumpur
Authors: Revindran Magarajothi , Ragen Pavitra N.K. , Mahmud Bahri
Published: April 2020

Online shopping has made shopping more convenient since not only it saves time and cost, but it also gives consumers the opportunity to compare items/goods against other retailers through web-browsing. Nonetheless, there are many factors which influence the purchasing behaviour of consumers. In this study, four factors related to logistics service quality were examined in order to determine which factors impact online shoppers’ satisfaction. The four factors mentioned were timeliness, product availability, condition of the product and reverse logistics. Questionnaires related to this study were distributed to online shoppers around Kuala Lumpur area and 153 responses came back. These responses were analysed for reliability tests, Pearson Correlation Coefficient, and multiple regression analysis in SPSS software. The outcome of Cronbach’s alpha showed that the questions in the questionnaire are highly reliable. As for the correlation and regression analyses, there was a significant and positive relationship between timeliness, availability, condition and return logistics. In addition, availability had the highest correlation (r = 0.721) with online shopper’s satisfaction on the logistics service quality of the e-retailers.
Research on the Marine Energy Transportation of China
Authors: Bin Wang , Qiuping Yang
Published: April 2020

Firstly, the current situation of energy structure and consumption in China is analyzed. It can be seen that crude oil and natural gas are highly dependent on foreign countries. At the same time, the situation of the energy transportation is analyzed. Finally, the challenges of energy transport corridor of China are analyzed, and some policy recommendations are put forward.
Risk Assessment of Ship Navigation Collision in Inland Waterway Transportation System Based on Bayesian Method
Authors: Yang Lupeng , Xing Zhiwei , Shi Te
Published: April 2020

Due to the high risk and uncertainty of ship navigation, the identification, early warning and control of ship navigation risks have always been studied by scholars. In recent years, water traffic accidents have occurred frequently, resulting in an incalculable number of casualties and property losses, which makes ship navigation risk management more and more a research hotspot. Ship navigation risk is a complex system consisting of a number of risk factors. The assessment of it is a systematic project aimed at clarifying the risk factors that need to be controlled. The purpose of this paper is to use Bayesian methods to assess the risk of navigational collisions in inland waterway transport systems. In this paper, the Bayesian network and the inland waterway transportation system ship navigation collision risk simulation are combined, and the concept of the ship navigation collision risk analysis model of the Bayesian network inland waterway transportation system is proposed. This method essentially utilizes three important characteristics of Bayesian network itself—complex relation representation ability, probability uncertainty representation ability and causal reasoning ability. Through the expert experience and ship navigation collision risk simulation of inland waterway transportation system the data is learned, the knowledge contained therein is mined, and the ship navigation collision risk analysis model of the inland waterway transportation system is established, and the risk assessment analysis is carried out based on the model. Through a large number of experiments, the proposed method can better model the navigation state of the ship, quantify the navigation risk of the ship, and identify the navigation anomaly data.
Traffic bottleneck control method based on road residual capacity and flow allocation
Authors: She Hao , Xie XingSheng
Published: April 2020

In order to dissipate traffic congestion and bottleneck quickly, a traffic bottleneck control method based on residual capacity and flow distribution of road section is proposed. According to the standard of adjustable green letter ratio in the limit case of upstream and downstream of the bottleneck section, the capacity that the bottleneck section needs to increase is allocated to the upper and lower reaches for adjustment. According to the weight of the remaining capacity of the section, the capacity that the relevant section of the bottleneck section needs to increase is allocated to the adjacent section. The green time of non-bottleneck related phase is compressed and tested to prevent congestion transfer. The effectiveness of the algorithm is verified by simulation experiment.
The application of multi-level fuzzy comprehensive evaluation of improved analytic hierarchy process in ship safety evaluation
Authors: Li Jun , Zhu Yunsheng
Published: April 2020

In order to evaluate the safety status of transport ships, a multi-level fuzzy comprehensive evaluation model based on improved AHP (Analytic Hierarchy Process) is proposed. The weight of factors is determined by improved AHP, which effectively solves the problem that the judgment matrix determined by experts with strong subjectivity is difficult to be consistent, and the problem that a large number of single factor information of various risk sources is ignored is reasonably solved by using multi-level fuzzy comprehensive evaluation. This paper conducts the case study on the model. The results show that the model can evaluate the ship safety risk scientifically and reasonably, and provide reference for the ship management company and the maritime bureau to improve the management methods.
Study on the application of ultrasonic flaw detection to the monitoring of deep water steel cofferdam
Authors: Wang Minghui , Wang Bijun , Zhang Qiao
Published: April 2020

In order to provide a dry operation environment for the construction of high pile cap in water, the steel cofferdam must be completely sealed when working underwater. Therefore, in order to avoid leakage of cofferdam due to welding defects, high requirements are put forward for the splicing weld quality of cofferdam components. Ultrasonic testing is widely used in the detection of cofferdam welds because of its strong environmental adaptability, convenient operation, high automation level and strong data processing ability. This paper introduces the application of ultrasonic detection technology in steel cofferdam, which has achieved good results.
Effect of Wheelset Steering Stiffness Difference on the Dynamics Performance of a High-speed Railway Vehicle
Authors: Cui Tao , Wang Qi , Liu Xuegang , Chen Sijie
Published: April 2020

In order to study the influence of steering difference of wheelsets among one bogie on the dynamics performance of vehicle, a highly nonlinear dynamics model of the high-speed railway vehicle multi-body system is built. In numerical simulations, the combined condition of taking the upper and lower limits of the steering stiffness of wheelset is investigated, respectively. It shows that the effect of wheelset steering stiffness on the dynamic performance is not significant. Its influence on the lateral vibration of bogie frame, hunting stability of vehicle, operation safety when negotiating curved tracks and wheel wear is generally within 5%. Its influence on the maximum lateral and vertical acceleration of carbody is generally within 10% and the influence range of specific cases is within 20%. For all the numerical cases, the vehicle dynamics indexes all meet the required limit.
Pricing and Incentive Mechanism for Green Building Supply Chain with Reference price
Authors: Jiang Wen , Huang Xiaoyan , Liu Menglin
Published: April 2020

Based on the stackable game theory, this paper studies the pricing and incentive mechanism of a two-echelon green building supply chain consisting of a developer and a contractor. We build the profit maximization models of the developer and the contractor for three scenarios that without reference price and incentive mechanism, with the reference price but no incentive mechanism and with the reference price and incentive mechanism. Then study the optimal decisions of the developer and the contractor in different situations. The results show that introducing incentive mechanism and reference price into building supply chain pricing can effectively increase the profit of developers and contractors. In addition, it can also improve the level of green buildings and promote the sustainable development of the construction industry. Finally, the sensitivity analysis shows that the optimal pricing increases as the initial reference price increases; The optimal pricing, incentive intensity and green building level are increasing in initial green building level and decreasing in increment cost coefficient.
The advantages of C-pillars in the large space of the terminal: A case study of Beijng Daxing international airport terminal
Authors: Huihui Liu
Published: April 2020

This article takes the Daxing Airport terminal as an example to discuss the particular requirement of large terminals in space, energy saving and indoor environment. The interior of the Daxing terminal adopts of C-shaped pillars, which comprehensively considers many issues, making the perfect combination of space and structure, function and art.
Design Essentials of Forest Aviation Fire Airport
Authors: Rui Sun , Fang Surui , Hui Tanjian
Published: April 2020

As an important facility for forest fire prevention and fighting, forest aviation fire airport (hereinafter referred to as forest Airport) plays an important role in preventing and fighting forest fires and protecting forest ecosystem with its advantages of fast, efficient and less limited by geographical space. Based on the analysis of the current situation of forest airport construction, this paper puts forward the design points of forest airport, and combines with case study, in order to provide reference for similar projects.
Research and Application of Urban Road Traffic Safety Risk Evaluation Based on Regional Disaster System Theory
Authors: Cheng Lianhua , Yang Sha , Li Shugang
Published: April 2020

Urban road traffic risk restricts the construction of safe cities. In order to scientifically evaluate urban road traffic safety risks, the regional disaster system theory is taken into consideration, and the coupling role of various parts in the regional disaster system is fully considered, and the regional disaster safety risk assessment ideas are proposed; Analyzing the main factors affecting urban road traffic safety risks, we form a framework of urban road traffic safety risk influencing factors based on regional disaster system ideas from four aspects: hazard, disaster bodies, disaster environment and emergency response capabilities; taking a city as an example, we analyze the influencing factors of road traffic safety risks in that city, construct an index system of urban road traffic safety risk assessment, and verify the feasibility and effectiveness of the risk assessment ideas and the framework of risk influencing factors. The results show that the risk assessment ideas and the framework of risk influencing factors have certain rationality, and provide a theoretical basis for effectively preventing the occurrence of urban road traffic accidents.