bluuebunny/crossref_metadata_2025_split huggingface dataset:
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

AbstractThe 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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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.