bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research on Application Technology of Iron Tailings in Artificial Sand
Authors: Cui Zhengxu 
Published: August 2019

Abstract
Iron tailings are the solid waste discharged by the concentration plant after useful components is selected from the ore, which is an important source of environmental pollution in mining development. Iron tailings not only needs to occupy a lot of land and cause great harm to the surrounding ecological environment, but also needs to treatment and maintenance costs. The comprehensive recovery and utilization of iron tailings resources can not only make full use of mineral resources, expand the utilization scope of mineral resources, as well as extending the service life of the mine, it is also an important means of pollution control and ecological protection, can also save a lot of land and capital, solve the employment problem, benefit the human society, and realize the effective unification of resource benefit, economic benefit, social benefit and environmental benefit, after many years of research, iron tailings can be used in artificial sand making. This paper analyses the current status condition of iron tailings and attempts to provide some useful suggestions and countermeasures for the utilization of iron tailings.
Characteristics of Soil Texture Changes of Soft Rock and Sand Compound Soil with Different Planting Years
Authors: Zhang Haiou , Zhang Lu , Xu Yan , Wang Zhao , Lu Yangjie 
Published: August 2019

Abstract
As a new type of compound soil of soft rock and sand in Mu Us Sandy Land, Whether the texture state can maintain stable development is the primary concern. In this paper, the Mastersizer 2000 laser particle size analyzer method was used to analyze the variation characteristics of particle composition of mixed soil with different volume mixing ratios (1:1, 1:2, 1:5) in field tests from 2010 to 2016.The results show: With the increase of planting years, the content of clay and silt increases, the content of sand decreases, and the texture of the compound soilpresents a benign development trend.with the ratio of 1:1, 1:2 and 1:5 of soft rock and sand compound soil, and the C/F value of the compound soil tends to decrease, and the tillage layer tends to refine, which improves the stability of the compound soil.Therefore, the compounded soil can maintain a good and stable state of development during the utilization period, and it does not need to be compounded after many years.
Numerical Simulation Study on The Degree of Submarine Cable Protection by Riprap Protection Layer Against Anchor
Authors: Cheng Zhiyuan , Zhang Zhonggui , Nie Qiong 
Published: August 2019

Abstract
Based on the discrete element theory, the rockfill-anchor-cable discrete element model was built on the PFC3D simulation platform. Combined with the engineering practice, numerical simulation of the penetration process of anchor into the submarine cable riprap protection layer was carried out, the relationship between force and displacement and the sidewall pressure of the submarine cable under the anchor partial penetration were obtained, and the anti-anchor damage ability of the submarine cable was evaluated quantitatively. The results show that the resistance force of the riprap to the anchor increases gradually with the increase of anchor invasive displacement, and eventually stabilize, which reflects the forming, developing, rupturing and restructuring process of the physical chain of the ripped-rock. Furthermore, the riprap protection layer has a significant protective effect on the submarine cable.
Cassiterite Recovery from Tungsten Residues Through Centrifugal Gravity Concentration
Authors: Yang Junyan , Song Bo , Wang Lijun 
Published: August 2019

Abstract
Tungsten residues contain abundant valuable minerals that are difficult to be recovered by traditional gravity and flotation process.This study presents a route, centrifugal concentration for cassiterite recovery from tungsten residues through centrifugal concentrator. There were separated to three size fractions by experiment of elutriation using rotary flow analyser and cassiterite was observed by polarizing microscope and X-ray diffraction analysis. Results showed that after closed-circuit experiment of centrifugal concentration in the condition of roughing rotate speed of 850rpm, pulp mass concentration of 15%, washing water flow rate of 2L/S and concentrating rotate speed of 550rpm, the grade and recovery of Sn were 18.63% and 82.17% respectively. After closed-circuit experiment, Sn recovery of size fraction was calculated. Sn recovery of size fraction was 97.93% in size fraction of -37+20um, 82.94% in size fraction of -20+10um and 66.49% in size fraction of -10um. This study demonstrates that the centrifugal concentration provides a promising process for the recovery of cassiterite from tungsten residues.
Joint Tomography with Seismic First-break And Reflection under Rugged Topographical Conditions
Authors: Guo Tianzhi , Xu Chun , Song Liang 
Published: August 2019

Abstract
Seismic travel-time tomography is one of method which can inverse some information of underground medium such as structure, velocity distribution and so on. In order to solve the problem about seismic tomography under rugged topographical conditions. The author develops a new way for seismic tomography by combine LTI method based on hybrid meshes which has high fitting degree for the variable structure underground with LSQR algorithm. Thus, the joint tomography with seismic first-break and reflection under rugged topographical conditions has been achieved. The stability and effectiveness is verified by theoretical model test.
Similarity Test of Rainfall Infiltration Model for Tailings Dam Slope
Authors: Xin Baoquan , Wan Lu , Dang Wenyi , Lu Wei , Zhang Xiangjian 
Published: August 2019

Abstract
In order to explore the rainfall infiltration mechanism of tailings dam and its influence on dam properties, experiments were carried out by self-made tailings dam sand trough model and rainfall simulation system. The dynamic characteristics of infiltration rate with different rainfall intensity were obtained. The results show that in the process of rainfall infiltration, saturation is the first place under the dam. But the final water content remained stable and the difference was small. For the same rainfall intensity, the rainfall infiltration process of tailings dam can be divided into three stages. The water accumulation point is 0.59 mm/min and the saturation point is 0.23 mm/min. Different rainfall intensities have the same trend in the infiltration process. Finally, it tends to saturate permeability coefficient Ks. The infiltration rates of the three rainfall intensities decreased by 81%, 60% and 21% respectively at the two boundary points.
Orogenic Gold Metallogenic System in North Margin of Yangtze Block: Preliminary Study on Tectonic Evolution and Mineralization
Authors: Wang Yizhong , Wang Dequan , Wang Jianguo , Deng Shengbo 
Published: August 2019

Abstract
The northern margin of the Yangtze massif is mainly composed of Longmenshan orogenic belt, Hannan-Micangshan uplift and Beidabashan arcuate tectonic belt. The strata are composed of sedimentary caprock and basement. The basement is Archaean-Lower Proterozoic and Mesoproterzoic volcanic rocks. Continental collision between North China plate and Yangtze plate, the three secondary tectonic units have very high similarities in geological structure, geological evolution, mineralization and deposit characteristics. Therefore, we believe that the northern margin of the Yangtze block can be classified as a metallogenic belt. The orogenic gold metallogenic belt on the northern margin of the Yangtze massif has geological conditions for forming large-scale gold deposits. However, the formation time of the gold deposit is younger, lower crustal uplift, and the degree of erosion of the sedimentary caprock is weak. The deep ore-rich body has not exposed the surface. It is suggested to carry out systematic comprehensive aeromagnetic, voyage weight, avionics and other geophysical exploration work in the gold mineralization belt on the northern margin of the Yangtze block. Finally, a favorable target area is delineated.
Study on Hyperspectral Characteristics and Content Estimation of Soil Iron Oxide
Authors: Liu Jinbao , Sun Zenghui 
Published: August 2019

Abstract
The iron oxide in the soil comes from the re-deposition of the weathering products of the parent material. It can be divided into free iron oxide (Fed) and amorphous iron oxide (FeO) according to chemical methods. The content of iron oxide in soil can be used as the soil type in soil system classification. Diagnostic indicators are considered to be a function of soil development and development. Although the traditional method for measuring iron oxide in soil has high precision, it is time-consuming and laborious, and it is impossible to obtain real-time monitoring data of soil physical and chemical properties in time. Hyperspectral remote sensing technology can quickly obtain the spectral information of soil by using hyperspectral instrument, combine the chemical data measured indoors with the physical model to establish the relationship between soil properties, realize the quantitative estimation of soil information, and have the tradition of rapid and current situation. The unparalleled advantages of soil iron oxide measurement methods provide broad application prospects for understanding soil iron oxide spectral information and its content prediction.
The Vertical Distribution Characteristics of Carbon to Nitrogen Ratio in Soft Rock and Sand Compound Soil
Authors: Guo Zhen , Wang Yike , Cao Tingting , Wang Huanyuan 
Published: August 2019

Abstract
This study takes the soft rock and sand compound ratio communities located in Fuping, Shaanxi Province as the research object. Four treatments of soft rock and sand volume ratios of 0:1 (CK), 1:5 (C1), 1:2 (C2) and 1:1 (C3) were selected to analyze the relationship between carbon-nitrogen ratio (C/N) of compound soil and the soil nutrient and texture. The soil organic carbon and total nitrogen content decreased with the increase of soil depth under different treatments. The average organic carbon content ranged from 1.45-2.70 g·kg-1 and the organic carbon content of 0-10 cm soil layer was significantly higher than 20-30 cm soil layer, compounding ratio had a significant effect on organic carbon. With the increase of volume fraction of soft rock, the organic carbon content of 0-10 cm soil layer was the highest in C3 treatment. The average value of total nitrogen was between 0.28-1.31 g·kg-1, and the total nitrogen content of 0-10 cm soil layer was significantly higher than that of 10-20 cm and 20-30 cm soil layer. In the 0-10 cm soil layer, the total nitrogen content of C3 treatment was significantly higher than other treatments, and the compound ratio and soil layer had significant effects on total nitrogen. The average value of C/N was between 1.72-5.92, which was the lowest at 0-10 cm, and the value decreased with the increase of the volume fraction of soft rock, and the treatment with C3 was the most significant. When the ratio of soft rock to sand was 1:1, it can promote the accumulation of carbon and nitrogen in the surface soil of 0-10 cm and enhance the decomposition of microorganisms.
Study on Preparation and Shielding Effect of Lead-Zinc Tailings Sand Mortar
Authors: Chen Zhenfu , Xiao Lifang , Tao Qiuwang , Xie Liping 
Published: August 2019

Abstract
In order to study the shielding performance of lead-zinc tailings mortar, a lead-zinc tailings mortar with different contents of tailings sand (0%, 20%, 40%, 60%, 80%, 100%) was prepared. The mass attenuation coefficient in the energy range of 1keV-100GeV is calculated by XCOM theory. The test results show that with the increase of tailings sand content, the mass attenuation coefficient of mortar increases gradually, and the shielding performance is better. The simulated value and experimental value have Good consistency; the mortar strength prepared with lead-zinc tailings will decrease with the increase of tailings sand content, and the amplitude is larger.
The Application of CFG Pile Composite Foundation in the Reconstruction of the Dujiangyan
Authors: Chen Jia , Chen Wei , Zhang Ke , Li Lin 
Published: August 2019

Abstract
There are many shallow treatment methods for soft foundation, CFG pile composite foundation is one of the common treatment methods. In this paper, the application of CFG pile in multi-storey residential building is introduced, it is pointed out that CFG pile composite foundation is a simple, rapid, economical and effective foundation treatment method.
Analysis of high wind resistant stability of South Anchorage caisson of Oujiang River North Estuary Bridge in Wenzhou
Authors: Chen Peishuai , Qin Zonghua , Rao Weisheng , Li Dejie 
Published: August 2019

Abstract
The South Anchorage caisson of Oujiang Beikou Bridge in Wenzhou adopts the scheme of “four successive heights and four subsidences”, which will be attacked by typhoon during the period of caisson heightening. In order to ensure the caisson passes through typhoon season smoothly, the anti-wind stability of the caisson secondary connecting section under different wind speed and different action angle is checked. The results show that the maximum displacement of the structure increases sharply with the increase of wind speed, and the effect of load direction on the maximum displacement of the structure is less than the influence of wind speed. The relevant conclusions can provide guidance for the safe passage of the high section of Caisson in typhoon season.
Water Use Disparity in China-An Overview and Revision
Authors: Long Qiubo 
Published: August 2019

Abstract
The accuracy of water use statistics has attracted more attention especially after the publication of “Three Red Lines” policy in China. Based on data from China Water Resources Bulletin (CWRB) and China Census for Water (CCW), the authors analyzed water use disparitiesby integrating multiple approaches and identified causes for disparities in industrial and agricultural water uses. We presenteda set of modified water uses data from 1997 to 2015, which might be more realistic and hopefully will provide more accurate base data for future water resources management.
Simulation Research on Dynamic RCS Characteristics of Cruise Missile
Authors: Wen Baoqian , Wang Tao , Cheng Kun 
Published: August 2019

Abstract
The target radar cross section (RCS) is an important basis for air defense radar detection and tracking. Aiming at the influence of flight attitude change on the target RCS during the actual flight process, a dynamic RCS method based on the target static RCS database and the target motion track is proposed. The dynamic RCS characteristics of the cruise missile under the actual motion track are simulated, which is convenient for the air defense radar to accurately and quickly detect the target, and further provide operational advice for the best timing of the air defense weapon interception target. The simulation results show that the method can quickly and accurately obtain the dynamic RCS characteristics of the air target. The analysis of the simulation results can provide a theoretical reference for the air defense weapon to intercept the enemy’s incoming target.
Evaluation of Environmental Pollution Control Efficiency in Qingdao City And promotion countermeasures research
Authors: Wang Yiyang 
Published: August 2019

Abstract
Analyze the input and output status of various environmental pollution control projects in Qingdao from 2007 to 2015, and then use the super-efficiency DEA and ML index methods to calculate the comprehensive efficiency. The results show that the comprehensive efficiency of environmental pollution control is increasing year by year, but Compared with advanced cities, there is still a big gap; scale efficiency has not been optimal, and scale returns are diminishing; the efficiency of industrial waste gas, industrial waste water, sewage treatment and greening is relatively low, and the efficiency of waste and waste treatment is relatively high. The input or output scale of pollution control projects should be adjusted, the concentration of treatment should be improved, and the system improvement, technology and management level should be promoted.
Water pollution index evaluation of lake based on principal component analysis
Authors: Liu Dalin , Huang Faming , Kang Wenjing , Du Yaoxian , Cao Zhongshan 
Published: August 2019

Abstract
Poyang Lake is the largest freshwater lake in China, with a wide area and abundant species resources. It is a serious issue to protect and monitor the water quality of Poyang lake. This paper proposes to use principal component analysis (PCA) to evaluate the water pollution index of Poyang Lake. The input variables of PCA are the weekly monitoring water pollution factors including dissolved oxygen (DO), chemical oxygen demand (CODMn) and NH4+-N. The water quality monitoring station is in Hukou County of China from 2004 to 2014. Finally, a series of new water pollution indexes are generated by PCA to reflect the change characteristics of lake water pollution. The results can provide support for the comprehensive evaluation of lake water quality. Meanwhile, the results also discuss the variation in water pollution, which is practical and innovative.
Study on Characteristics and Influencing Factors of Air Pollution
Authors: Zhu Yuxin 
Published: August 2019

Abstract
Beijing-Tianjin-Hebei region, the capital economic circle of our country, is a serious polluted area at present. Under the coordinated development of this strategy, it is of great significance to explore the characteristics and influencing factors of air pollution in Beijing-Tianjin-Hebei region. In this paper, the characteristics of Beijing-Tianjin-Hebei air pollution are analysed by descriptive statistics, and the main factors affecting Beijing-Tianjin-Hebei air pollution are obtained by regression analysis based on the characteristics of Beijing-Tianjin-Hebei region.
Analysis of Noise Pollution and Control of 110kV Transformer Substations
Authors: Fan Xiaopeng , Tang Wenyuan , Li Li , He Hongming , Zou Zhuanglei , Ma Cunren 
Published: August 2019

Abstract
An example of noise control for the north gate of Quzhou110kV transformer substation. Based on the survey, measurement of the sound sources, and also result analysis, the acoustic enclosure with natural ventilation is designed by using the space around the main transformer and considering the heat dissipation of the main transformer, and also the maintenance requirement in the future. With dedicated acoustic modeling, the Cadna/A software prediction results show that the main transformer noise radiation to the measuring points of factory boundary near the residential area and residential area in the out of factory boundary decrease more than 12dB after the proposed noise control structure. After the superposition of background noise, the noise level of factory boundary and the sensitive point in the out of factory boundary reach to the 1 class sound functional area standard.
Photocatalytic performance of carbon nitride intercalation compound
Authors: Wan Lijuan 
Published: August 2019

Abstract
The carbon nitride intercalation compound photocatalyst was synthesized by a simple molten salt route. The photocatalyst was characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM) and Fourier transform infrared (FT-IR) spectroscopy. The photocatalytic oxidation ability of the carbon nitride intercalation compound photocatalyst was evaluated by the photocatalytic activity in photo-oxidation of MO. The as-prepared photocatalyst exhibits an improved photocatalytic activity due to the increased surface area.
Research on Satisfaction of Habitat Natural Environment
Authors: Wang Ying , Wang Runzhou 
Published: August 2019

Abstract
With the continuous development of China’s economy and the deepening of urbanization construction, the public’s requirements for the quality of living environment are getting higher and higher. The good natural environment of human habitat is the necessary prerequisite for the sustainable development of regional social economy. On the one hand, it is also a powerful guarantee for improving public satisfaction and improving the quality of public life. The Beijing-Tianjin-Hebei urban agglomeration is centered on the capital and is an extremely important area for population gathering in China. However, due to many factors such as fragile ecological environment, unreasonable economic structure, imperfect environmental protection and management system, etc. It faces greater pressure for improvement.
Summary of flue gas denitration technology for coal-fired power plants
Authors: Yang Wanpeng 
Published: August 2019

Abstract
With the rapid development of the economy, nitrogen oxide pollution has become a problem that cannot be ignored. Therefore, it is necessary to strengthen the control of nitrogen oxides in coal-fired power plants. This paper introduces the current denitration technology overview, including the selective catalytic reduction (SCR), non-selective catalytic reduction (SCNR), SCR-SNCR mixed denitration technology, including acid absorption, Wet denitration technology such as lye absorption method, oxidation absorption method and activated carbon absorption method, as well as coal-fired flue gas combined desulfurization and denitration technology were introduced. The process principle and characteristics were briefly described, and the development direction of flue gas denitration technology was introduced. The outlook was made.Introduction Nitrogen oxides (NOx) is an atmospheric pollutant that combines with water in the air to promote the formation of acid rain. It also produces photochemical smog under certain conditions with other pollutants. It also participates in the destruction of the ozone layer and oxidation. Nitrogen will destroy the ozone layer in the high-temperature stratosphere and increase the incidence of skin cancer. Therefore, while building a power plant to meet social energy needs, it should strengthen the effective control of nitrogen oxide emissions from coal-fired power plants, reduce air pollution, and reduce the serious damage caused by nitrogen oxides emissions to human living environment. The emission of nitrogen oxides from power plants. Denitration technology is particularly important.
Prediction of summer precipitation change in the middle 21st century (2021-2050) of Qinghai-Tibet Plateau based on the MPI-ESM-MR/RegCM4 Model
Authors: Gong Boy , Huang Ya , Weng Baisha , Fang Dongqing 
Published: August 2019

Abstract
The Regional Climate Model RegCM4.5 driven by the MPI-ESM-MR was used to predict the summer precipitation over the Qinghai-Tibet Plateau in the middle of the 21st century (2021-2050) under the RCP4.5 and RCP8.5 scenarios. Results showed that under the RCP4.5 and RCP8.5 scenarios, the average annual summer precipitation in the southeastern Qinghai-Tibet Plateau and the Qilian Mountains increased significantly, while the western Qinghai-Tibet Plateau decreased significantly, and the interannual variation trend of the summer precipitation was not significant. In the future, the summer precipitation over the Qinghai-Tibet Plateau has significant diurnal variation patterns and spatial differences between east and west regions. Specifically, summer precipitation decreases during daytime, while it increases slightly during night, especially in the eastern Qinghai-Tibet Plateau. At the same time, the increase in the probability of precipitation intensity above 10mm/day in the eastern of the Qinghai-Tibet Plateau means that the probability of extreme precipitation in the future may increase, while the precipitation intensity below 10mm/day is slightly reduced.