bluuebunny/crossref_metadata_2025 huggingface dataset:
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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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.
Analysis of major controlling geological factors on coalbed methane enrichment and accumulation model of low coal rank in Tuha-Santanghu Basin
Authors: Yun Li , Yongshang Kang
Published: April 2020

The low-rank coalbed methane resources in the Tuha-Santanghu Basin are rich, but the degree of exploration is low. The main controlling factors and accumulation model of coalbed methane accumulation are insufficiently understood, which restricts the exploration and development practice. In order to find out the main controlling factors and accumulation mode of low rank coalbed methane in Tuha-Santanghu Basin, from the aspects of low coal rank coal seam distribution, coalbed methane gas types and origins, comprehensive considerations such as hydrogeology, tectonic and sedimentary conditions, etc, the reservoir-forming conditions of low rank coalbed methane gas are analyzed, and the accumulation model is proposed to further explore direction. The results show that hydrogeological condition affect the generation and enrichment of low rank coalbed methane in this area, which is an important conditions for the formation of low rank coalbed methane. It is advantageous to save the low-rank coalbed methane with weak runoff. Different tectonic conditions have different effects on the preservation of coalbed methane, which can be divided into favorable preservation and destructive preservation. The influence of coal-forming environment on coal’s gas-generating potential, top and bottom lithology and coal reservoir physical has an important impact on low rank coalbed methane. The comprehensive study proposes two types of low-rank coalbed methane accumulation models in the Tuha-Santanghu Basin: gas accumulation model of basin margin slope zone and gas accumulation model of stagnant confined water + lithologic plugging coalbed methane in small fault sag. Comprehensive analysis shows that coal-bearing slope zone of basin margin with favorable hydrogeological conditions and coalbed methane reservoir with good preservation conditions in small fault sag with retaining confined water+lithologic plugging characteristics will be the key exploration area in the future.
Geochemical characteristics of Cretaceous granitoids and their implication for tectonics in Vietnam
Authors: Liu Yang , Fang Nianqiao , Song Chaojie
Published: April 2020

Vietnam is located between the Pacific subduction zone and Tethys orogenic belt. There are numerous Cretaceous granitoids in Vietnam, belonging quartz-diorite-granosyenite- granite-leucogranite magmatic series. According to geochemical data, granitoids are sub- alkaline. Samples in SV are calc-alkalic, with lower A/CNK and (Zr+Nb+Ce+Y) values, which belong to I-type granite. And those in NV are allali-calcic, with higher A/CNK values but lower (Zr+Nb+Ce+Y) values, which belong to S-type granite. Granitoids exhibit fractionated REE patterns with negative Eu anomalies, and show enrichment in LILEs and depletion in HFSEs. Because of the absence of alkaline dark-colored minerals, abundant intermediate igneous rocks and assemblage of I- and S-type granite with orogen-related geochemical characteristics, it is believed that there was compressive structure in Vietnam in Cretaceous due to Meso-Tethyan subduction.
The characteristics of nano-pore of the 3rd member shale from Dongying Formation of Paleogene in Liaozhong Sag
Authors: Cheng Yong , Wen Yiming , Zhang Songyuan , Li Yuexiwei , Li Yadong
Published: April 2020

The reservoirs structure and pore characteristics of shale have greatly influenced the reservoir, adsorption and migration of oil and gas, and have become one of the important contents of reservoir physical characteristics evaluation. The organic-rich shales in the 3rd member shale of the Dongying Formation in Paleogene, Liaozhong sag, Bohai bay basin were studied in this paper. Firstly, the surface of shale sample was etched by argon ion polishing technology, and then the microscopic pore morphology was observed by field emission environment scanning electron microscope. The results show that: 1) the pores of shale reservoir in 3rd member shale of the Dongying Formation from Liaozhong sag are divided into inorganic pores (including intergranular pores, intragranular pores, interstratal pores and intercrystalline pores), organic pores and microfractures; 2) the intergranular pores are largely developed, intragranular pores and interlaminar pores are relatively developed, micro-cracks are less developed, and intergranular pores and organic pores are rarely developed.
Application of SEM and EDS for mineral composition of shale gas reservoir
Authors: Wen Yiming , Cheng Yong , Liu Zhennan , Liu Cong , Nie Qi
Published: April 2020

In recent years, great progress has been made in the exploration and exploitation of shale gas, making it the main driving force for the growth of world natural gas production. Mineral composition restricts the pore size, distribution, geometry and connectivity of shale reservoirs, and also affects the brittleness and fracturing ability of shale reservoirs. Therefore, mineral composition is of great significance to the evaluation and exploration and development of shale gas reservoirs. Taking the Paleogene shale reservoir in Liaozhong Sag as an example, this study explored the application of argon ion polishing technology, Field Emission Scanning Electron Microscope (FE-SEM) and X-ray Energy Dispersive Spectrometer (EDS) analysis in mineral identification.
Main diagenesis of middle-lower Ordovician of Yubei Area in Tarim Basin
Authors: Hanting Zhao , Zongqi Wang , Liujuan
Published: April 2020

According to analysis of cores, rock sections, casting sections, logging data of Ordovician carbonate reservoirs in the Yubei area, reservoir rock in the study area include 4 types: mud micrite limestone, grain limestone, biological limestone and dolomitic limestone. In combination with core photos and imaging logging analysis, reservoir can be divided into pores and cracks. Diagenesis mainly includes compaction, pressolution, cementation, filling, recrystallization, dolomitization, dissolution. To sum up, the main constructive diagenesis includes recrystallization, dolomitization, dissolution, otherwise the main destructive diagenesis includes compaction, pressolution, cementation, filling.
Analysis of Temporal and Spatial Evolution of Rocky Desertification Sensitivity in Tongren, Guizhou Province
Authors: Ren Jiaxue , Meng Dan , Chen Haitao
Published: April 2020

Based on the image data of Tongren in 1996, 2003, 2011 and 2017, spatial analysis and mathematical statistics were used to analyse the spatial and temporal evolution of the rocky desertification sensitivity in Tongren in the past 20 years. Combining the current status of rocky desertification sensitivity, grading sensitive regions and proposing corresponding treatment suggestions. The results showed that: (1) The sensitivity of rocky desertification in the western regions was relatively high. From 1996 to 2017, the slightly and moderately sensitive areas increased first and then decreased. It can be seen that low sensitivity regions has achieved remarkable improvement in recent years; while the areas of highly sensitive and extremely sensitive decreased first and then increased, whose regulation need to be strengthened .(2) The trend of rocky desertification sensitivity of some regions has improved while the others has deteriorated to some extent. The area of slight improvement and slight deterioration is the largest, which meant the governance is occurring while the destruction phenomenon still exists. The sensitive and insensitive conversion areas are small, while the different degree of sensitivity are relatively large. (3) The prevention and control of the karst regions in Tongren is divided into three levels, the area of level 1 to 3 is 5539.14km2, 3450.89km2and 2879.37km2respectively, aim to each level we proposed corresponding measures to guide the restoration of rocky desertification in the southwest karst area.
Preliminary Analysis of Ionospheric Responses to Geomagnetic Storms Using the BDS GEO Satellites
Authors: Zhao Kunjuan , Yan Wenhe , Yang Haiyan , Yang Xuhai
Published: April 2020

The rapid development of Global Navigation Satellite System (GNSS) provides a reliable way to monitor the ionospheric response of geomagnetic storms. Compared with other types of satellites, the advantage of using the Beidou Navigation Satellite System (BDS) Geostationary Earth Orbit (GEO) satellites to monitor the ionosphere is that it has almost fixed Ionospheric Pierce Points (IPPs). When using the GEO satellites to monitor the ionosphere, the earth sites only need consider the ionospheric temporal change without considering the spatial change. In addition, the ionospheric delay directly calculated by the combined observations does not introduce model error and fitting error, and can obtain continuous and high-precision ionospheric delay series. According to the Disturbance Storm Time index (DST index) provided by World Data Center for Geomagnetism of Kyoto, three large geomagnetic storms occurred in 2015. This article uses the BDS dual-frequency observations to calculate the ionospheric VTEC sequences during the geomagnetic storms at the four sites KZN2, JFNG, SIN1, and CUT0, respectively; and the ionospheric responses during the three large geomagnetic storms in 2015 are preliminarily analysed. The results show that the ionospheric responses to geomagnetic storms are mainly positive and negative anomalies. Combining the results of each site during three geomagnetic storms, it is certain that different seasons have a decisive impact on the positive and negative ionospheric responses of geomagnetic storms.
Geochemical and hydroclimatic constraints on the formation of borate deposits in Da Qaidam Salt Lake of Qaidam Basin, northern Tibetan Plateau
Authors: Gao Chunliang , Yu Junqing , Min Xiuyun , Cheng Aiying
Published: April 2020

The pinnoite deposit occurred in the lakebed of Da Qaidam Salt Lake in Qaidam Basin is rare in the world. This study focused on the pinnoite, ulexite and hydroboracite from Da Qaidam Salt Lake, through multi-index methods including mineralogy and geochemistry, aiming to interpret the mechanism of pinnoite and other borate minerals. The results showed that pinnoite as well as ulexite and hydroboracite in lakeside are formed in the lake environment with specific hydrogeochemical conditions (e.g., alkaline brine, hydrochemical types, boron concentration, boron ions, Mg/Ca ratio, dilution and mixing mechanism). The borate formation was controlled by a coupling mechanism, i.e., the inherent geochemical characteristics and the external conditions.
Application of Assembled Building with Steel-structure in Earthquake-prone Areas in Sichuan Province
Authors: Pan Hongzhou
Published: April 2020

Anti-seismic, energy-saving and environmental protections are the core themes of residential development in any country or region. China is one of the countries with the most serious seismic hazards in the world. The occurrence frequency of strong earthquakes is in the forefront of the world. Sichuan is located in the relatively active Eurasian seismic belt. In recent years, after the Wenchuan, Ya'an and Jiuzhaigou earthquakes, another earthquake of magnitude 6.0 occurred in Changning County of Yibin City in June 2019. Assembled building with steel-structure has the advantages of high anti-seismic property, high degree of industrial production, short construction period, energy conservation and environmental protection, convenient transportation, and fast construction speed, which can effectively protect people’s lives and property in the event of earthquake. Based on the analysis of the development status of steel earthquake-resistant structures at home and abroad, combined with the particularity of Sichuan geography and geomorphology, this paper discusses the advantages of assembled building with steel-structure in earthquake-prone areas, and the implementation methods of assembled building with steel-structure in Sichuan seismic hazard reconstruction.
The development of emotional indicators for the soundscape in urban open public spaces
Authors: Zhang Yan , Kang Jian
Published: April 2020

Increasing urbanization has had a profound impact on the acoustic environment. Research on soundscapes in urban open spaces depends on users’ perceptions and feelings. By exploiting the semantic differential method, this study aims to investigate the emotions that constitute the perceptions and feelings of soundscapes in urban open public spaces. This research was carried out through a laboratory audio–visual experiment using photographs and binaural recordings of 16 urban open public locations across Harbin, China. A total of 48 participants were required to assess both the ‘perceived emotion’ and ‘felt emotion’ of the soundscape by questionnaire. A semantic differential analysis of the results shows that although the soundscapes in urban open spaces are rather complicated, it is still possible to identify five major factors of felt emotion and seven major factors of perceived emotion. Distinguishing between “felt emotion” from “perceived emotion” in soundscapes may bring about changes in evaluation and design, which will help planners better understand how to design a place to provide its users with their expected experience.
Monitoring analysis of a deep foundation pit construction adjacent to old buildings
Authors: Chen Wenzhao , Wei Xiaoqing , Fan Jiaqing , Yang Kai , Yao Xiangrong
Published: April 2020

The deformation and surface settlement need more attentions when a foundation pit is adjacent to old buildings. The foundation pit of Liangyuan Garden museum project was used as the background, and author analyzed the monitoring data which gathered from beginning to end. The results show that the lateral deformation of foundation pit mainly occurs in the excavation stage, and the influence of surrounding buildings on deformation needs to be considered. The retaining structure with inner support system shows a good deformation coordination ability and obvious spatial deformation characteristics. Entering the impervious layer makes the dewatering curtain effectively block the connection between inside and outside water system. This measure reduces the excavation impact on the groundwater level outside the pit and prevents excessive consolidation settlement in the surrounding soil layer.
Comparative study on performance of basalt fiber asphalt concrete after environmental action
Authors: Yan Jingchen , Yan Junjie , Zheng Jianlong
Published: April 2020

The AC-16 asphalt concrete with A grade 90# asphalt and A grade 90# asphalt mixed with 0.3% basalt fiber as the binder was taken as the research object, passing the rutting test, trabecular bending test and freeze-thaw splitting test. The high temperature stability, low temperature crack resistance and water stability of the two asphalt mixtures after different environmental impact factors showed that the dynamic stability, maximum bending strain and residual strength ratio of the basalt fiber reinforced asphalt concrete were significantly higher. In the matrix asphalt concrete. The dynamic stability of basalt fiber asphalt concrete compared with matrix asphalt concrete increased by 15.79%, 14.7%, 16.51%, 18.18%, respectively, after environmental influence factors and UV, high and low temperature alternating, freeze-thaw and salt freezing environment. 17.95%; after the same environmental action, the maximum bending strain of basalt fiber asphalt concrete increased by 14.99%, 30.57%, 18.77%, 19.29%, 15.94%, respectively; the residual strength ratio increased by 3.82%, 5.61%, 8.82%, 10.76%, 10.36%; and the accuracy of the test data was verified microscopically from the action of basalt fiber by scanning electron microscopy.
Preparation and Performance Study of New Type Steel Slag Ceramic
Authors: Liu Xueting , Tian Yue , Wei Dan , Liu Jincheng
Published: April 2020

In this paper, steel slag with chemical components of CaO and S1O2 was used as raw materials to prepare new steel slag ceramic by referring to the traditional ceramic production process, and the vickers hardness and flexural strength were studied. The results show that steel slag can be used as raw material in the preparation of ceramic, with the increase of the content of steel slag, the hardness and flexural strength of steel slag ceramic increase to different degrees.
The Beauty of Slope Land: Practical Study on Aesthetic Features in Landscape Design of Mountain Residential District
Authors: Li Yi , Shen Duwen , Zhang Ran
Published: April 2020

Through the analysis of rhythm, symmetry contrast, texture proportion, diversity unification and other aesthetic features in the landscape of the slope, it is fully used in the landscape planning process of Liang ping sunshine and rose city in Chongqing to create a modern community landscape that leads modern urban life. Creating slope landscape features and improve the quality of mountain residential district.
Review of Construction Technology of Typical Immersed Tube Engineering
Authors: Xu Binbin , Liu Yongsheng
Published: April 2020

This paper introduces the development status of sea-cross passage, the classification and construction technology of immersed tunnel. Taking the Femern tunnel as an example, its construction process is analysed in detail and it is compared with the HK-Zhuhai-Macao Bridge. The results show that the construction technology and engineering equipment of immersed tunnel in China have reached the world leading level.
A quick method for repairing damaged coating of cladding reinforcements
Authors: Li Qiushi , Zhang Wenfeng , Chen Tao , Kai Liu
Published: April 2020

A quick method for repairing the damaged coating of cladding reinforcements was proposed in this work. Four quick repair systems were applied and conducted salt spray test, including only heat shrinkable material, anti-corrosion tape+heat shrinkable material, anticorrosion tape+glass fiber reinforced plastic, and viscoelastic anti-corrosion tape+glass fiber reinforced plastic. The results indicated that after 720h of salt spray test, no corrosion was observed on the steel substrates inside the protective layer of all the four quick repair systems. All these quick repair systems performed excellent property of corrosion resistance. The proposed method is easy to operate and can effectively improve the repair efficiency of the epoxy coating reinforced coating damage.
Research and Application of Water Soluble Temporary Plugging Agent
Authors: Li Chengwei , Huang Fada , Zhang Xiaoshuan , Guo Shoubo
Published: April 2020

With the wide application of temporary plugging agent in new oil and water wells, China’s research on water-soluble temporary plugging technology can better deal with various problems in construction. Now we have four tests on the indicators of water-soluble temporary plugging agents. First, the water soluble temporary plugging agent was tested for dissolution in five different liquids at different temperatures. Secondly, the flow tester is used to measure the breakthrough pressure to further determine its strength. Again, the water insoluble matter in the water-soluble temporary plugging agent is tested for damage. Finally, in order to further determine the differential pressure performance of the temporary plugging agent, the temporary plugging agent is tested in the field, and the test result satisfies the requirement of 80 Mpa. The test results have met the engineering requirements, and the on-site test of the temporary plugging agent is consistent with the actual engineering standards, which has important guiding significance for the field oil and gas field mining.
Wear Mechanism of Cemented Carbide Tool and Modeling Tool Wear in Machining Inconel 718
Authors: Hongjun Zhang , Jianguang Li , Zhaopeng Hao
Published: April 2020

When machining Inconel 718, tool wear is a serious problem, which affects the quality of workpiece. In order to analyze the wear mechanism in dry machining Inconel 718 with cemented carbide tool, the wear morphology of tool was observed by CCD and scanning electron microscopy (SEM) equipped with energy dispersive X-ray spectrometer in this paper. The results showed that at low cutting speed, the formation and shedding of the built-up-edge caused severe cutting tool breakage. When the cutting speed reached 40 m/min, the tool material fell off from the tool substrate in the form of wear debris, which was the main reason for tool wear. In addition, the elements diffusion between the tool and the workpiece and oxidation reaction accelerated the formation and falling off of wear debris. According to the tool wear mechanism, a tool wear prediction model was established. In machining Inconel 718, the excellent experimental agreement have been obtained in the prediction of wear in cemented carbide tool.
The Impact of Color Rendering on Perception Luminance in Interior Zone of Tunnel Considering Low Visibility
Authors: Zhao Enzhong , Dong Lili , Zhang Tong , Feng Sen , Lou Qi
Published: April 2020

LED lights are widely used in highways and tunnels because of their long life, low light attenuation in recent years. The influence of color rendering (CRI) on lighting safety has attracted people's attention as the increase in demand. In this paper, the influence of different CRI on perception luminance of human eyes under different fog transmittance and different luminance was calculated and analyzed. A calculation model of human eye perception luminance considering mesopic vision and fog concentration was proposed. An experiment was conducted by observing different colored targets in a fog chamber. The results showed that yellow targets and high CRI can provide higher perception luminance and the latter is recommended for tunnel lighting in interior zone.
Calculation and Analysis of Fatigue Life of Gravity Dam Based on FEM
Authors: Wei Liuchuang , Wei Ping
Published: April 2020

Gravity dam is a hydraulic structure subjected to high stress loads by its own weight to maintain its stability. Gravity dams mainly bear the pressure of reservoir water changes, the impact of high-intensity earthquakes, the wind and waves, the vibration of generator sets, etc. Therefore, the structural safety of dams is a major event related to engineering safety. It has very important theoretical significance and practical value for dam structural safety analysis. In this paper, the concrete gravity dam is taken as the main research object. The dam is modeled by the finite element method. According to the water level of the dam reservoir, the static and dynamic analysis of the dam under various responses, the deformation situation and strain situation of the dam is studied. Then combined with seismic wave selection and power spectrum estimation method, the seismic performance of the dam is analyzed. The specific method is to find the weak point of the dam and study the fatigue life of the dam to obtain the overall fatigue life of the dam.
Calculation and Analysis of Seismic Response Dynamics of Gravity Dam
Authors: Wei Ping , Wei Liuchuang
Published: April 2020

The gravity dam has the characteristics of clear structure, simple design method, safety and reliability, and strong adaptability to topography and geology. The static and dynamic modal analysis of the dam is carried out by the finite element method, and the vibration modes of each step are obtained. The dynamic response characteristics of the dam under seismic loading are analyzed, and the measures to effectively improve the seismic performance are proposed.
A Qualitative Case Study on the Use of Drone Technology for Stock Take Activity in a Third-Party Logistics Firm in Malaysia
Authors: Nier Ruwaine Dan June , Wahab Siti Norida , Daud Dazmin
Published: April 2020

The activity of stock taking in any business is important and must be done on a regular basis because as it ensures the company is on the right track to reach its business target. This case study is concerning the use of drones for stock taking. The main focus for this case study is the use of drones for stock taking in a Malaysian third party logistics company (company XYZ). This work will look to address on how effective or beneficial is the use of drone technology for stock take method in company XYZ and adoptability level of company XYZ to adopt drone technology. This study is in the form of an exploratory research which uses qualitative means to gather data in regards to the adoption of drone method for stock take in the company. Purposive sampling method is employed in this study. Data were collected based on interview and questionnaire done on the warehouse manager & assistant manager, stock control manager, and head of operations department. The outcome of this work showed that drone method of stock take is in fact very beneficial as there was significant reduction of duration for the stock take activity.
Design of Railway Exceptional Dimension Cargo Reinforcement Scheme System
Authors: Yue Yang , Ran Zuo
Published: April 2020

The reinforcement of exceptional dimension cargo has always been a task of high technical difficulty and strong security demand in railway transportation production. Based on the rules and regulations related to the exceptional dimension cargo loading and reinforcement scheme, this paper uses vb.net to design a system that can formulate exceptional dimension cargo reinforcement schemes by computer. The reinforcement program is the main content, including the exceptional dimension cargo loading program subsystem. A reasonable cargo loading plan is generated based on the relevant parameters of the goods provided, and a speed limit requirement is provided for the operation of the cargo train. This paper calculates the various forces and cargo stability factors that will be encountered when transporting goods, and generates a reasonable reinforcement plan based on the selected reinforcement materials and gives a sketch of the cargo loading reinforcement. The complete cargo reinforcement scheme system simplifies the work of cargo forwarders and quickly obtains reinforcement schemes for simple and exceptional dimension cargo.
Study on the lateral displacement of deep water submerged dike structure
Authors: Liu Wenbin , Zhao Yan
Published: April 2020

With the rapid development of economy, the deep-water wharf, inland waterway, breakwater are increasingly extended to the open sea. Due to the natural environment is getting worse and worse, the construction is becoming more and more difficult.This paper base on a project in He chang zhou waterway section of Long River study on the lateral displacement of deep water submerged dike structure. There are in-site tests to monitor the lateral displacement. The lateral displacement was recorded and a fitting function to predict the long-term settlement was proposed.
Research on forecasting method of aviation traffic based on social and economic indicators
Authors: Zhang Xianming
Published: April 2020

With the continuous deepening of the Reform and Open combining rapid growth of the national economy, China’s civil aviation industry has made considerable progress in expanding the scale of transportation. According to the basic ideas and action guidelines determined by China’s economic and social development strategic planning, the overall goal is to build a safe, efficient and green mass civil aviation transportation system by 2030. The rapid development of the civil aviation industry is bound to bring a rapid increase in the passenger throughput of civil aviation. The size of the airport is closely related to the passenger throughput. Therefore, the airport passenger traffic forecast results will become an important basis for determining the future scale of the airport. This paper proposes a comprehensive forecasting method combining trend extrapolation and econometrics with economic and social indicators, and elaborates the method with examples.
Ticket Price Sensitivity of Airport Rail Link—a Case Study of Changsha Maglev Express
Authors: Fu Ji , Liu Wanming
Published: April 2020

There is difference between airport rail link and urban rail transit in service tenet and service object. Urban rail transit serves mostly for urban residents, to meet their needs of commuting and daily life, while the chief target passengers of airport rail link consist of air passengers whose trip purposes are connecting flights from or to the city. The travel time value and price sensitivity of passengers who take the airport rail link are quite different from those who take the urban rail transit.

Changsha Maglev Express Line, opened in May of 2016, is an airport link rail applying the technology of urban maglev transportation. Before the opening of commercial operation, the authors conducted a sample survey on passengers and staffs at Changsha Huanghua International Airport, to get information of the willingness of the target passenger’s ridership and acceptable fares of the rail. Passenger’s price sensitivity of Changsha Maglev Express is calculated, and the price deciding work of Changsha Maglev Express is contributed. The paper could provide some useful reference to the study of pricing and incomes on other airport link rails.