bluuebunny/crossref_metadata_2025_split huggingface dataset:
Seismic performance factors of RC frames with infilled walls based on APOA and IDA
Authors: Yanjun LI , Dagang LU , Zhenyu WANG 
Published: April 2020

Abstract
Seismic performance factors are important parts of performance-based seismic design, and values of seismic performance factors are directly related to structural safety and economy. Six typical RC structures in high intensity region are designed according to the current Chinese Codes, and finite element models are built on OpenSees platform. The objectivity and accuracy of modeling methods are verified by existing experimental results. Values and rules of seismic performance factors are revealed by adaptive pushover analysis (APOA) and incremental dynamic analysis (IDA). Through comparison with values of design codes, values of the system overstrength factor, the ductility reduction factor, the response modification factor and the deflection amplification factor in this paper is reasonable, and this study provides theoretical reference for Chinese Codes. Analytical methods have important effect on seismic performance factors. Comparing with the IDA method, the APOA method underestimates seismic performance factors. Structural height has significant influence on seismic performance factors. Overstrength factor increases with increase of structural height but ductility reduction factor, response modification factor and deflection amplification factor decrease. Infilled walls increase seismic performance factors of RC frame with infilled walls. The effect of infilled walls on seismic performance factors decreases gradually with increase of structural height.
Study on the influence law of complex curtain horizontal freezing and freezing on the surrounding environment
Authors: Yu Changyi 
Published: April 2020

Abstract
Freezing up is one of the problems that are paid close attention to in the construction of artificial freezing method, especially the horizontal freezing up of complex curtain is difficult to be calculated by theoretical formula. The adaptability of numerical calculation is strong. In this paper, numerical calculation method is used to simulate the horizontal freezing and freezing expansion of complex curtain. Thermophysical parameters considered in the simulation change with the change of temperature field. Thermodynamic parameters of each point in soil are given by way of field variables, which provides ideas and methods for accurately simulating the horizontal freezing and freezing expansion displacement field of complex curtain.
Research on the development law of temperature field in horizontal freezing and melting of complex curtain
Authors: Yu Changyi 
Published: April 2020

Abstract
Artificial freezing method has been widely used in various underground projects, but the development law of melting temperature field of complex curtain is difficult to be calculated by analytical method. As a general method, numerical method is feasible to simulate the development of temperature field in horizontal melting of complex curtain. Based on the freezing construction of a subway connecting passage, this paper analyzes the law of temperature field development in the melting process, and proves the feasibility of this method by comparing with the measured data. The results can be used to guide the design and construction of artificial freezing.
An Atmospheric Correction Algorithm For GF-2 Image Based On Radiative Transfer Model
Authors: Cao Hongye , Han Ling , Zhang Tianqi , Li Liangzhi 
Published: April 2020

Abstract
The accuracy of atmospheric correction is a key factor affecting the quantitative application of GF-2 satellite. Due to the lack of short-wave infrared band in GF-2, it is impossible to use method of dark pixel for atmospheric correction. Therefore, a method of atmospheric correction coefficient lookup table (LUT) based on 6S (Second Simulation of the Satellite Signal in the Solar Spectrum) radiation transfer model and aerosol optical thickness (AOT) parameters retrieved from MODIS data is proposed, and the atmospheric correction of GF-2 satellite multispectral data is carried out. Dunhuang radiation correction field with flat and uniform surface is selected as the experimental area. The accuracy of the correction results is evaluated by synchronous measured data, and the normalized vegetation index NDVI before and after atmospheric correction is compared. The results show that the minimum relative error is only 0.9%. The image data after atmospheric correction can more truly reflect the reflection characteristics of ground objects. NDVI after atmospheric correction greatly enhances the contrast of vegetation information and highlights the ability of vegetation information discrimination of GF-2 satellite sensor.
A New Texture Feature Based on GLCM and Its Application on Edge-detection
Authors: Liu Chen , Xu Ao , Hu Caibo , Zhang Fan , Yan Fangjun , Cai Shenglong 
Published: April 2020

Abstract
In visual interpretation and recognition, the distinction and discrimination of objects in an image depend not only on the complexity of the texture of the image, but also the intensity of the contrast of the image texture. In the commonly used texture features, entropy can better reflect the complexity of the texture, but it can not reflect the difference between the gray values. The contrast can reflect the contrast of the image texture, but since only the difference is taken into consideration, the difference in the size of the pixel value itself is not considered. In view of the above phenomenon, in order to make the texture features satisfy the higher recognition and recognition of image differentiation, this paper proposes a new texture feature based on the gray level co-occurrence matrix. The new texture feature not only reflects the sharpness of the texture, but also reflects the complexity of the texture and applies the texture feature to edge detection. The results show that the edge detection based on the new texture features proposed in this paper can effectively detect various edges and has a good inhibitory effect on noise. At the same time, the edge detection results can effectively distinguish the edges of different degrees of change.
A Rapid Plotting Algorithm of Geodetic Line within Arch Height Error Threshold Limits under Mercator Projection
Authors: Li Binbin , Dong Jian , Peng Rencan , Liu Bo , Liu Guohui , Zhang Hao 
Published: April 2020

Abstract
In view of the problem that the interpolated distance parameters and the plotting precision of the geodetic line cannot be quantitatively regulated and adaptively matched, this paper extends the application of the solution method for constant line segment by considering the angle of the constant line and the geodetic line to the quantitative evaluation and control process of the error of the geodetic line plotting. Using the strategy of limiting the overall length error of the geodetic line plotting by the local arch height error threshold limits, a quantitative control model of interpolated distance parameters within the geodetic line plotting arch height error threshold limits is also established. A rapid plotting algorithm of the geodetic line with arch height error threshold under Mercator projection is proposed in this paper. The experimental results show that the algorithm can realize the rapid plotting of geodetic lines in any length and any latitude and longitude range, and the precision is controlled within the specified threshold range.
The Correlation Analysis of Atmospheric Model Accuracy Based on the Pearson Correlation Criterion
Authors: Cui Wenhui , Sun Zhenyu , Ma Hao , Wu Si 
Published: April 2020

Abstract
The atmospheric density above the Beijing area in 2012 is calculated by the DTM2013 atmospheric model and the MSIS00 atmospheric model, and the accuracies of the two models are derived by comparing with the measured data of GOCE in the same region and the same period. The correlations of the accuracies of the two atmospheric models and the variances of their corresponding solar radiation proxies are derived based on the Pearson correlation criterion. It is proved that the accuracy of the two atmospheric models is strongly correlated with the corresponding solar radiation proxy variances in the same period. The solar activity factors of the DTM2013 atmospheric model with higher accuracy are discovered, and the better application value of F30 solar radiation proxy in the atmospheric models is proved.
Study on Fast Positioning Algorithm for BeiDou Post-Mission Network RTK
Authors: Chen Xiangping , Yang Yifei , Zhou Conglin , Liao Chaoming 
Published: April 2020

Abstract
Aiming at the GNSS data resolving process and the network RTK positioning algorithm for the multisystem of GPS/BDS/GLONASS, C# and C++ programming were used to develop the resolving software of fast positioning for BeiDou post-mission Network RTK. The software supported self-defined resolving time and could resolve three dimensional user coordinates in a short time. The software was tested with the measured data from the BeiDou high precision reference station network in Guangxi and compared with the TBC+COSA_GPS processing software. And the results show that the proposed software could provide rapid positioning results for users with a centimeter-level precision.
Wetland Monitoring and Land Surface Temperature Response in Panjin City Based on Tiangong-2 Data
Authors: Jing Xing , Qinling Bai , Dan Meng 
Published: April 2020

Abstract
In the research area Panjin city, visible and near-infrared remote sensing images by Tiangong-2 wide-band imaging spectrometer was used to extracte wetland. According to the established remote sensing interpretation signs, the wetland types of Panjin city in 2018 are extracted by using the method of partition classification. The thermal infrared imaging spectrometer of Tiangong-2 was used to invert the land surface temperature based on the split-window algorithm. This paper comprehensively analyzed the distribution of wetland cover types of Panjin city in 2018 and their impact on land surface temperature. The results show that in 2018, Panjin wetland covers an area of 3,184.89 km2 and the major type of wetland is artificial wetland. The area is reduced successively according to paddy field, reed swamp, mudflat wetland, suaeda salsa swamp, aquaculture farm, reservoir/pond and river wetland. The overall accuracy of partition classification method is 89.97%, kappa coefficient is 0.8761. The applicability of Tiangong-2 wide-band imaging spectrometer in wetland monitoring is verified. The split-window algorithm can be used to effectively invert the land surface temperature of Tiangong-2 data, and the land surface temperature results obtained by inversion are in good consistency with those obtained by MODIS inversion, the correlation coefficient reached 0.79. Through counting, the land surface temperature of different wetland types is different, among which the land surface temperature of mudflat wetland is the highest and that of reservoir is the lowest.
Application of Side Scan Sonar Simulation Technology in Submarine Sediment Classification
Authors: Jintao Feng , Shaohua Jin , Gang Bian , Meina Wang 
Published: April 2020

Abstract
In the aspect of seafloor sediment detection, underwater acoustic method has been concerned and used because of its high working efficiency and continuous abundance of data, and the processing function of echo intensity data is to obtain backscattering intensity data which only reflect the change of seafloor sediment. However, relying solely on multi-beam bathymetric system or scanning Sonar will lead to awkward situations where the resolution is insufficient or topographic factors affect the effective removal. In this paper, the purpose of this paper is to reconstruct the sound intensity of side scan sonar in the same area by using the seafloor terrain data obtained by multi-beam bathymetric survey, and then to form a sonar image which eliminates the influence of terrain. This paper discusses how to deal with the directional scattering intensity data of many kinds of data sources, such as multi-beam bathymetric system and scanning Sonar, so as to provide a service for the effective classification of seafloor sediment.
Study on the influence of the shape and size of coarse aggregate on the strength of concrete
Authors: Guo Ya , Wu Jianfeng , Wang Caihua , Zhang Fang 
Published: April 2020

Abstract
Concrete is the largest building material at present, and coarse aggregate as one of the important materials of concrete, its performance will have an important impact on the performance of concrete. Firstly, the effect of coarse aggregate on the length of concrete is analyzed, then the influence of morphology, particle size and content of coarse aggregate on the performance of concrete is analyzed, and the existing problems are pointed out. All these work provide a basis for improving the performance of concrete and lays a foundation for optimizing the mix design.
Effects of Urea-formaldehyde Resin on Physical Properties and Frost Resistance of Autocalved Aerated Concrete Prepared with Fly ash
Authors: Zhang Ye , Zhang Jixiu , Duan Saihong , Liu Jikang , Miao Yuanchao 
Published: April 2020

Abstract
In this paper, the effect of urea-formaldehyde resin on aerating process and properties of autocalved aerated concrete (AAC) prepared with fly ash are studied. The results indicate the urea-formaldehyde resin has a relatively obvious water-reducing effect and a certain defoaming effect. The compressive strength of the fly ash AAC added urea- formaldehyde resin has not been significantly improved. The maximum amount is 0.5% and 0.25% is a suitable amount. In addition, the resin can obviously improve the frost resistance of AAC because of its film-forming in aerated concrete hydration products.
Experimental research on the effect of silicon powder on the performance of cement mortar
Authors: Lu Shuyan , Wang Jinsong , Chen Shengbing , Zhang Huaiyu , Chen Leping 
Published: April 2020

Abstract
To study the effect of the mechanical properties of silicon powder on cement admixture, the experiment was carried out, to investigate the consistency of mortar fluidity, breaking strength and compression strength test of the cement mortar samples with different dosage of silicon powder. The experimental results show that when the content of silicon powder is 0-4%, the consistency and fluidity of mortar can be improved, and the working performance of cement mortar can be improved; when the content of silicon powder continues to increase to 12%, the working performance of mortar decreases, but it still has good performance; when the content of silicon powder is 0-8%, the mechanical performance of mortar can be improved, if the content is too large, the compression strength and bending strength of mortar will be reduced, but It still plays a positive role in the strength of mortar.
Calculation and Analysis of Earth-rock Dam Seepage Flow Based on FEM
Authors: Wei Liuchuang , Wei Ping 
Published: April 2020

Abstract
Earth-rock dam is the oldest dam type and is the most widely used type of dam in the world. Because earth-rock dams have the superiority that other dam types do not have, earth-rock dams have a large proportion in China. After the earth-rock dam is built to retain water, it sees a seepage in the dam body. The earth and rock material in the saturated zone is subjected to buoyancy, which reduces the effective weight against sliding. After the dam is immersed in water, the shear strength index of the earth and stone will be reduced, and the seepage force may have an adverse effect on the dam slope. When the seepage flows out of the dam slope, dam foundation or river bank, the dam body may cause piping, fluid and other seepage damage. Therefore, we must carry out the seepage analysis of the dam body, and the finite element method is mainly applied to the seepage analysis of the dam body. This paper uses the APDL language programming of ANSYS software to complete the seepage calculation and analysis of earth-rock dams. This paper uses the post-processing module of ANSYS to view the seepage path, seepage results and wetting line of the earth-rock dam.
Comparative Analysis of Different Construction Methods for Mine Tunnels
Authors: Lu Yuan , Ke Wenhui , Huang Xiangguo , Xiao Mingzhao , Huang Juehao , Chen Jian 
Published: April 2020

Abstract
The construction of mining tunnels in cities often has a great impact on the stratum and surrounding environment. Relying on a drainage tunnel project in Wuhan, Plaxis3D finite element analysis software is used to simulate tunnel excavation under four typical construction methods. The ground conditions, tunnel size, burial depth, support and construction scheme are all guaranteed to be the same. The characteristics and rules of ground settlement, crown settlement and horizontal convergence caused by construction are mainly analyzed. The following results are obtained: For the four construction methods, the rules of ground settlement, crown settlement and horizontal convergence by tunnel excavation are basically the same. Except for the arch bottom uplift, the calculation results of the tunnel constructed by the double side drift method are the smallest, and the calculation results of the tunnel constructed by the bench method are the largest. The tunnels excavated by the CRD method and the CD method have similar calculation results and have relatively little impact on the stratum. The research results can provide references for other related projects in Wuhan.
FEM analysis of induced ground settlement of tunneling side-crossing high-voltage rod foundation considering reinforcement measures
Authors: YI Shun , KE Wenhui , Huang Xiangguo , Xiao Mingzhao , Chen Jian , Huang Juehao , LU Yuan 
Published: April 2020

Abstract
Taking the actual working conditions of the Wuhan Guanggu 1st/Gaoxin 4th drainage channel project as the research object, Finite Element Method (FEM) is used to analyse the effectiveness of reinforcement measures to control surface settlement deformation around poles during tunnel propulsion. Calculations prove that as the tunnel advances, the displacement around the high-voltage rod gradually increases and tends to stabilize; The numerical simulation study of the combined engineering conditions of different reinforcement measures shows that the pile foundation reinforcement and the pile top beam reinforcement both can effectively reduce the surface settlement, and the reinforcement effect in pile top beam is far greater than that in pile foundation; The numerical results of both the two reinforcement measures involved are compared with the actual monitoring data, and the results are in good agreement. Then the correctness of the numerical model is verified. Therefore, the two reinforcement measures in this area show great effectiveness by studying the four different engineering conditions. The reinforcement measures have certain reference value for related engineering design in this area.
The influence of excavation of combined foundations of high-voltage transmission towers and spoils loading on landslide stability
Authors: Yingbo Zhou , Hang Chen , Qiupeng Zhou , Zhiqiang Duan , Xiaojing Gao , Lisong Gao , Yongqiang Zhou 
Published: April 2020

Abstract
With the construction of “West-to-East Power Transmission” and national networked engineering projects, high-voltage transmission towers, which are important components of transmission lines, are important power engineering facilities. They are inevitably erected on the ridges, edges of steep slopes, and river banks. Therefore, induced by internal factors and external factors, it is easy to cause landslide disasters in these areas, resulting in power grid accidents such as tilting of power poles, disconnections, and trips. This article takes the Yanzi landslide in Badong County and 500kV transmission tower on the landslide as the research object. For the combined foundation excavation form of the tower foundation, the relative positions of different tower foundations and landslides and the loading of spoil are analyzed. The influence of excavation of transmission tower foundation and pile dumping on the stability of the landslide is discussed. The research results show that the effect of the combined foundation excavation on the stability of the landslide is negligible, but it will affect the stability of the local landslide, and the stability of the local landslide is related to the relative position of the tower foundation and the landslide. In addition, the pile loading of spoil will also affect the stability of local landslides, and the degree of impact is related to the size of the spoil pile.
Research on Natural Vibration Characteristics and Seismic Performance of Single-ribbed Steel Arch Bridge
Authors: Kongliang Chen , Ronghui Wang , Wenzhi Zhang 
Published: April 2020

Abstract
The single-ribbed steel arch is beautiful but with weakness of its lateral stability and lateral stiffness. Taking the single-rib steel arch bridge as the research background, finite element program of Midas is used to establish calculation models on the variation of vector span ratio, pier height and stiffness of the main arch for exhaustive analyzing the natural vibration characteristics and seismic response spectrum of the structure, and the corresponding laws are summarized in this paper. Research indicates that the change of pier height has a greater impact on the period and mode shape, and the change of the vector span ratio and the stiffness of the main arch have small effect on those of structure. The internal force of the arch leg is larger under the action of earthquake, which is jointly controlled by the longitudinal earthquake and the transverse earthquake, and the internal force of the arch is controlled by the lateral earthquake, and the internal force of the vault section is controlled by the transverse earthquake, and the internal force of the main beam cross-section is controlled by the transverse earthquake, providing reference for the design of single-ribbed steel arch bridge.
Effect of Natural Fractures on Shale Gas Reservoir Reconstruction
Authors: Qin Li , Zhang Xiaobing , Deng Xing , Cao Libin , Wu Jun 
Published: April 2020

Abstract
Natural fractures have great influence on shale gas reservoir reconstruction. In order to find out the law of influence, comprehensive analysis of the characteristics of geological natural fracture and fracturing fracture before fracturing is carried out. Firstly, natural cracks are identified by using coherence and maximum relief attributes of ground seismic data. Secondly, the characteristics of hydraulic fracturing cracks and the response characteristics of natural cracks are analyzed by using the results of microseismic monitoring and positioning and the data of hydraulic fracturing construction. Finally, the influence of natural fracture on the effect of fracturing reconstruction is summarized. The results show that the response characteristics of natural cracks predicted by surface earthquakes are different in the results of microseismic monitoring. According to the response characteristics of natural cracks, they can be divided into active and inactive natural cracks. Combining with the fracturing data, it is found that both active and inactive natural cracks will affect the fracturing construction to varying degrees. Active natural fractures are prone to abnormal construction conditions such as sand plugging, casing deformation and fracturing fluid leakage. Non-active natural fractures play a role of stress shielding under certain conditions, which can affect the fracturing fracture morphology and the effect of fracturing reservoir reconstruction. The research results provide a basis for shale gas horizontal well trajectory optimization and adjustment of hydraulic pressure construction parameters.