bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on The Process Control of DCO3 Low Carbon Aluminum Killed Steel
Authors: Li Junsuo , Liu Yanxia , Wang Yang , Dong Zhongqi
Published: March 2021

It is to reduce the performance variation of DCO3 aluminum killed steel be fluctuations caused by components that the smelting and rolling process was controlled and adopted a chemical composition design plan of low-carbon + micro-alloying elements.Research result shows that microstructure of the DCO3 aluminum killed steel plate is ferrite, Further more various mechanical properties of the steel plate are in correspondence with standard requirements.
Research on Energy Saving and Emission Reduction of Ecological Environment of Modern Green Art Museum
Authors: Qian Jiang
Published: March 2021

The art gallery is a public place that exhibits works of art, cultivates popular culture and art, and cultivates sentiment. The art gallery is the embodiment of a city’s cultural level, and it is also important spiritual support for facing a well-off society and realizing the great rejuvenation of the Chinese nation. The development of a city is concentrated in pieces of unique and charming artworks, which are witnesses to the times’ changes. Therefore, designing an art museum that can meet all cultural functions and be energy-saving, green, and environmentally friendly becomes more and more important. Based on this research background, the thesis conducts environmental protection design of the art museum to realize the control of the project site planning and the unique climate adaptability design of the art museum, which helps to ensure that the design project from the macro to the micro-level better reflects the energy-saving design. The effect plays a positive role in promoting the development of art gallery design theory and is of great significance to improving the practice methods of green public art gallery design.
Residents’ adoption intention of formaldehyde air purifier: the role of perceived values
Authors: Zhang Bin , Hu Xi , Xiang Jian , Gao Yueyi , Wang Xiaoming , Chen Yan , Jiang Jun , He Gangfeng , Zhang Chunyan , Sun Jiajia , Wu Fei , Shi Zujian , Xing Peiyu
Published: March 2021

Indoor formaldehyde is widely existed which poses a threat to residents’ physical health. In order to eliminate the risk of formaldehyde pollutant, individuals usually adopt formaldehyde air purifiers. In this empirical study, we aim to investigate individuals’ adoption intention of formaldehyde air purifier from the perspective of consumption values. Grounded in the Protective Action Decision Model, our research framework underlines the mechanism through which one’s personal knowledge and risk perception affect the perceived functional and non-functional values of formaldehyde air purifiers and subsequently impact the adoption intention. A survey is conducted to validate our model. This research contributes to the literature by enriching current understanding of individuals’ protective behavioral intention in the context of indoor formaldehyde.
Preparation and Friction Performance Research of a Translucent Hydrophobic Film
Authors: Chen Ling , Zhu Li , Fu Feie
Published: March 2021

Alumina hydrophobic film is widely used, but there are few studies on its friction performance. Traditional hydrophobic films are self-assembled with a layer of low surface energy compound on the alumina film surface. The surface is in contact with other substances during use, causing the loss of low surface energy substances and reducing the hydrophobic properties of the film. We use organics and alumina alternate coatings to form an organic-inorganic composite layer, and then tested its hydrophobicity and friction performance.
Experiment Study on Hardening Behavior of Slab Cold Roll-Beating Forming
Authors: Cui Limu , Li Yan , Chen Xuedong , Liu Dina , Huo Yongqiang , Wang Nannan
Published: March 2021

New production technologies have been developed over these last few years as answers in response to new market needs, such as higher production flexibility, lower volume batches, more complex shapes for final pieces and new materials. Cold roll-beating is an advanced precision plastic forming technology to better meet the current requirements. To investigate a material’s behavior in cold roll-beating forming operations, in this paper the principal of slab cold roll-beating was briefly introduced and slab cold roll-beating experiments were carried out, and results of the analysis conducted on the produced pieces in terms of metallographic structure and hardness distributions were reported. Our results show that the cold roll-beating forming can cause the metal surface to harden while improving the mechanical properties of the material, which is interesting in order to understand a material’s behavior when it is subjected to this peculiar deformation process; furthermore, it is of great guiding significance for further applications of the new forming technology.
Study on the stability and rheological behavior of almond Oil microemulsion
Authors: Yan Shengkun , Kong Na , Yang Jiapeng , Yin Lijun
Published: March 2021

In this study, the formation mechanism of almond oil microemulsion were studied to provide a theoretical basis for the development of almond oil microemulsion. First by the stability of almond oil microemulsion test results show that the system in different conditions of centrifugal (5000, 10000 r/min), storage temperature (- 18 °C, 4 °C, 25 °C and 37 °C and 105 °C) and salinity (0.1, 0.5, 1.0 mol/L) and P H (PH = 1,5,9,13) conditions, have good stability, high light transmittance, almond oil microemulsion system stability is good.Finally, the formation mechanism of almond oil microemulsion was studied, and it was concluded that the n values of almond oil microemulsion prepared by different types of surfactants were all less than 1, all were pseudoplastic fluids, and the shear viscosity decreased with the increase of shear rate.The n values of almond oil microemulsion prepared with different n-butanol contents were all less than 1 and were pseudoplastic fluids. The shear viscosity decreased with the increase of shear rate, and the order of K values was: 1:2 > 1:3 > 1:4.This study has certain theoretical guiding significance to further study the formation mechanism of almond oil microemulsion and the development and production of microemulsion.
Distribution and Pollution Evaluation of Nitrogen and Phosphorus of Sediments in Zhangze Reservoir
Authors: Hao Xiaoyan , Feng Minquan
Published: March 2021

The nitrogen and phosphorus pollution of sediments has increasingly become the main cause of eutrophication in reservoir. The temporal-spatial distribution features and pollution level of nitrogen and phosphorus of sediments were revealed in Zhangze Reservoir. The nitrogen and phosphorus content of 16 sediment samples were detected, as well as sediment oxygen demand. The temporal-spatial changing rules of nitrogen and phosphorus of sediments were analyzed. The pollution level of sediments was evaluated. The results showed that the total nitrogen content of sediments varied from 506 mg/kg to 4411 mg/kg, the total phosphorus content of sediments varied from 160 mg/kg to 961 mg/kg, and the sediment oxygen demand varied from 1295.7 mg/(m2•d) to 2957.6 mg/(m2•d). The nitrogen and phosphorus content of sediments in north and south section was larger than that in middle section. The temporal variation rule of nitrogen and phosphorus content was that it increased obviously in flood season and decreased obviously in freezing stage. The nitrogen pollution level of most of the sediments was severe pollution, with the most serious pollution near the dam and at the end of the reservoir. The phosphorus pollution level of most of the sediments was mild pollution, with moderate and severe pollution near the dam and at the end of the reservoir.
The Research on Improving the Precision of The Polymer IFHI By BP Neural Network of The Method Data Normalization
Authors: Zhang Dingran , Chen Lei , Wang Yiqi , Wang Huiya
Published: March 2021

BP neural network has a good effect on data prediction. Using BP neural network to predict polymer fire risk index (IFHI) is a cross research method based on computer intelligent learning model and traditional fire risk assessment. In order to solve the defect of low precision of BP neural network in IFHI prediction, a solution to standardize the initial data processing is proposed to optimize the BP neural network simulation model. In the construction of BP neural network model, the range, threshold, and weight of the initial data need to be processed globally, and then the BP neural network is simulated and trained. Finally, the data is simulated and predicted by using MATLAB. The output results of the neural network with different data standardization processing methods are compared to verify the simulation accuracy. The results show that the input node parameters of BP neural network are processed by Z-score normalization method, which improves the learning ability of the model, improves the accuracy of the prediction effect, and reduces the IFHI error of prediction.
A New Strategy to Improve the Performance of Aluminum-Sulfur Battery
Authors: Jiang Weichuan , Bian Yinghui , Zhang Yonglei , Lin MengChang
Published: March 2021

Both aluminum and sulfur are promising materials for future-generation electrochemical energy storage technology owing to their natural abundance, low cost, and high capacity. However, a rechargeable aluminum–sulfur (Al–S) battery with high energy density suffers from poor reversibility and very short cycle life. This paper demonstrates an Al–S battery which comprised of a MWCN/S cathode, aluminum anode and deep eutectic solvent of AlCl3/acetamide. The Al–S battery delivers an initial capacity of ∼453 mAh g−1 and maintains a capacity of up to ∼358 mAh g−1 after 200 cycles.
Sulfur Analysis and Sulfur Transfer Rule During Simulated Thermal Processing of Heavy Oil
Authors: Chen Guolong , Zhu Xinxin , Jia Ke , Li Yuqing , Zhu Lijun
Published: March 2021

The distribution and transfer of sulfide in the thermal reaction process are studied. It has found that different types of sulfur have different distribution patterns in the refining process. Thiophene derivatives with better thermal stability are mainly distributed in the heavy components, while mercaptans and small molecular thioethers with poor thermal stability are mainly distributed in the light components. During the thermal reaction, part of the sulfide will decompose or react to produce sulfide with a smaller molecular weight, which will be transferred to light components or gases. The thermal reaction temperature has a certain effect on the product yield and sulfur content. As the reaction temperature increases, the liquid yield increases and the sulfur content decreases, but the thermal reaction temperature has little effect on the sulfide type distribution.
Measurement and Analysis of Ecological Efficiency in Fujian Province Based on DEA-Malmquist Index Model
Authors: Peng Qingxia , Lin Weiming
Published: March 2021

Under the new normal, the economic growth model of resource and environment consumption is unsustainable, and improving ecological efficiency has become an inevitable choice for high-quality economic development. Based on this, on the basis of constructing the input-output evaluation system of ecological efficiency at the city scale, this study uses DEA-Malmquist model to calculate the ecological efficiency and its dynamics of 9 cities in Fujian Province from 2009 to 2018. The results show that there are differences in ecological efficiency among different regions in Fujian Province, and the ecological efficiency of Fuzhou, Xiamen and Ningde all reach the best level. The ecological efficiency of inland areas in Fujian Province is obviously lower than that of coastal areas such as Fuzhou and Xiamen, which indicates that the coordination between inland areas and coastal areas should be strengthened. In addition, the coordination degree of regional production management and technological progress in Fujian Province is not high. Therefore, when the governments at all levels of Fujian Province plan the industrial development strategy, they should fully consider the development path suitable for improving the ecological efficiency, and finally realize the development strategy that green water and green mountains are the golden mountains and silver mountains.
Global and Regional Prediction and Evaluation Model of Plastic Pollution
Authors: Zhang Guomiao , Wang Meiji , Xu Hui , Song Yunna
Published: March 2021

A global and regional prediction and evaluation model of plastic pollution is proposed. We have collected the data of global plastic production and plastic related indicators of hundreds of countries in the past 100 years, and established a global disposable plastic waste accumulation prediction model based on time series model and multiple linear regression. Our model suggests that the earth’s disposable plastic waste will accumulate to the maximum level in 2054, but if we do not intervene in the current development trend of plastic waste, the whole ocean will be seriously polluted in 2024. We divide 145 countries into four categories by clustering algorithm, and establish multiple linear regression models with different leading factors, so as to put forward regional countermeasures. We use factor analysis method to evaluate the plastic pollution in 136 countries, so that the countries can control the plastic pollution more pertinently.
Study on Arc Extinguishing Performance of DC C4F7N/CO2 Mixed Gas
Authors: Wang Chengli , Li Jing , Liu Shuxin , Cao Yundong
Published: March 2021

The arc characteristic analysis of C4F7N/CO2, CO2 and SF6 gases with volume fraction of 10%C4F7N-90% under DC condition is studied. Firstly, based on the internal physical process of arc, a two-dimensional axisymmetric arc model of C4F7N/CO2, CO2 and SF6 gas was established and calculated. The arc temperature distribution and dynamic characteristics of three gas media are compared and analyzed the results show that the temperature distribution of C4F7N/CO2 mixed gas is more similar to that of SF6 gas arc, and its radial cooling speed is faster, indicating that compared with CO2 gas, C4F7N/CO2 mixed gas has better arc-quenching characteristics, which can be used in the study of SF6 substitute gas.
Effect of glycolide dosage on molecular weight of poly (lactic-co-glycolic acid)
Authors: Chen Xiaoqi , Bai Lu , Tian Jia , Zhou Haijun , Zhou Mengmeng , Xiao Jijun , Li Yantao
Published: March 2021

A series of biodegradable polymers, poly (lactic-co-glycolic acid) (PLGA) were prepared by ring-opening polymerization with racemic lactide and glycolide as main raw materials. Gel Permeation Chromatography (GPC), differential scanning calorimetry (DSC) and ubbelohde viscometer were uesd for the characterizations of the PLGA. And the effect of glycolide’s (GA) content on molecular weight (Mw), vitrification transition temperature (Tg), intrinsic viscosity [η] of PLGA was discussed. The results show that the GA’s content in PLGA molecular structure is higher than the actual feeding ratio. Meanwhile, with the increase of GA’s content, the Mw, [η] and Tg of PLGA decreased.
Analysis on the influencing factors of users’ usage intention and user behavior patterns in online medical community under COVID-19
Authors: Lv Wenxia
Published: March 2021

With the spread of COVID-19, the shortage and uneven distribution of medical and health resources in the traditional medical industry, as well as the vulnerability to infection, have aroused concerns. As a new way of Internet medical treatment, online medical treatment greatly alleviates the pressure of difficulty in getting medical treatment. However, few studies have explored the factors that influence users’ use of online medical communities and the patterns of users’ behavior. Based on the theory of perceived value, social support, information asymmetry and information behavior of “Type Person”, this paper constructs the influencing factor model of users’ usage intention in online medical community. Questionnaires were distributed to users in the online medical community, multiple linear regression was conducted through SPSS to test the assumptions in the model, and then user groups were clustered to analyze user behavior patterns. The results showed that perceived benefit, social support, medical effect and user trust had positive effects on users’ usage intention, while perceived risk had a negative effect on it.” Type A” users have a lower intention, “Type B” users are skeptical about medical effect, “Type C” users have a higher intention, and “Type D” users pay more attention to emotional support. Finally, this paper provides some suggestions for online medical community to improve the quality of medical information service.
A New Type of Manganese Dioxide Car Air Conditioner Filter Element
Authors: Liao Minru , Sun Haotian , Wang Zehao , Xu Xiaoyang , Qin Cang
Published: March 2021

Cars are already a daily necessity for every household. As a device that every car must install, the car air-conditioning filter is responsible for filtering the air inside and outside the car. The air passing through the pipe achieves clean air and protects the interior of the car. The purpose of personnel, but according to research, the air quality in close to 40% of cars is not up to standard. The China Consumers Association used the method of sampling statistics to sample 51 passenger cars as test samples, including 22 car brands including European, American, Japanese, Korean, and domestic. The results show that nearly 40% of vehicles do not meet the current air quality requirements for passenger cars. As a firewall to ensure clean air, car air-conditioning filters are constantly being developed and updated in order to meet the air quality requirements in the car. At present, the air-conditioning filter elements on the market are basically activated carbon filter elements, and the filtration performance is not satisfactory. Based on the traditional air-conditioning filter element, this paper designs an air-conditioning filter element with birnessite-type manganese dioxide as the core. The experiment shows that it is 15% better than the common single activated carbon air-conditioning filter element in adsorption efficiency and purification efficiency.
Research on Frequency Estimation Method of Underwater Target Echo Signal for Acoustic Decoy
Authors: Rao Zhe , Sun Qiang , Yuan Zhiyong , Shi Zhaoming
Published: March 2021

The body target effect of the torpedo can affect the Doppler frequency estimation accuracy of the torpedo echo signal received by the detonating acoustic decoy fuze, which will cause errors in the position of the detonation point. A joint frequency estimation method of amplitude ratio and segmented phase difference (Rife-Segmented Phase Difference Method, referred to as RP method) is proposed. This method combines the traditional Rife algorithm and the segmented phase difference algorithm. By preprocessing the estimated signal frequency and adopting different estimation algorithms in different frequency bands, and high-precision estimation of Doppler frequency of the target echo signal is achieved. The simulation results show that the method has high estimation accuracy and good stability. It improves the accuracy of extracting the Doppler frequency information of the torpedo target echo, so as to realize the accurate prediction of the tipping point position and improve the probability and effect of torpedo damage. This method can be used for reference by relevant technicians.
Experimental Study on the Mechanical Properties of Triaxial Compression of White Sandstone under the Coupling Action of Chemical Corrosion and Temperature
Authors: Wang Yong , Sun Jiabin , Liang Zhonghao , Huang Sa , Wang Yongyan
Published: March 2021

In order to study the chemical corrosion and temperature coupling effect on the triaxial compression mechanical properties of white sandstone, first, the white sandstone is soaked in acidic, neutral, and alkaline solutions respectively in different temperatures, after that, triaxial compression tests were carried out on the treated white sandstone, then, the strength and deformation of white sandstone after coupling action are analyzed, finally, the chemical corrosion and temperature coupling mechanism is studied. The results show that: At the same temperature (below 100°C),the triaxial compressive strength of the specimens in acidic and alkaline environments is lower than that in neutral environments. In the same chemical (acid or alkali) environment, the triaxial compressive strength of the specimen decreases with the increase of temperature (below 100°C); In a neutral environment, with the increase of temperature (below 100°C),the triaxial compressive strength of the specimen decreases slowly and basically remains unchanged. Below 100°C, the damage of rock caused by temperature is small and can be ignored; Different chemical (acid or alkali) environment can degrade rock damage and reduce its triaxial compressive strength. Temperature mainly affects the rate of chemical reaction, which damages the rock and reduces its strength.
Application research on hydraulic fracturing of cross-layer drilling in Sijiazhuang Coal Mine
Authors: Yao Zhuangzhuang
Published: March 2021

The No.15 coal seam of Sijiazhuang Coal Mine belongs to high gas and low permeability coal seam. Hydraulic fracturing, as a technical measure for outburst prevention, is more and more widely used in high gas outburst mines. The influence of hydraulic fracturing high-pressure water on stress and displacement of roadway is analyzed, and the feasibility of hydraulic fracturing is verified. The industrial test of hydraulic fracturing through layers was carried out and the effect of gas extraction was investigated. The average concentration and pure volume of gas extraction unit in the fracturing area were 3.1 times and 5.7 times of those in the non fracturing area, respectively, which verified the permeability increasing effect of hydraulic fracturing measures. Through fracturing test, the extraction effect has been significantly improved. This paper provides important theoretical support and practical basis for hydraulic fracturing under similar conditions.
Geotechnical Engineering Strain Intensity Distribution Parameter Monitoring and Centrifugal Mechanics Sensitivity Analysis
Authors: Ling Pingping , Chen Zeshi
Published: March 2021

With the construction of large and important projects, high-strength pile composite foundation, pile foundation and composite pile foundation are more and more widely used in foundation treatment. The study of pile-soil interaction can not only enrich the theoretical content of foundation treatment, but also has important engineering significance in optimization design. Based on the centrifugal model test technology, this paper adopts a set of self-designed loading devices. The model piles equipped with miniature load cells at different sections are subjected to a single pile loading test after the centrifuge reaches a stable operation state, and the pile length and the influence of the strength change of the pile tip soil on the load transfer law of the pile body and the pile-soil interaction characteristics. The results show that as the pile top load increases, the change in the soil stress around the pile caused by the pile side friction also increases. Under the influence of a certain pile side friction, the change in soil stress around the pile shows a tendency of attenuation in the radial direction of the pile. For the section with large side friction, the corresponding stress change of the soil around the pile is larger and the side friction resistance is small. For the section, the corresponding stress change of the soil around the pile is reduced accordingly.
Optimization of Fatigue Detection Method under Altitude Changes in Plateau Region Based on MTCNN
Authors: Han Sipeng , Tan Jingyang , Jiao Qianzhi , Tang Bo , Luo Yi , Yang Xuguang
Published: March 2021

Fatigue driving is the main cause of traffic accidents, and research on fatigue driving detection algorithms is of great significance to improve road safety. This paper proposes an image processing method based on MTCNN model detection optimization, Perform median filter denoising before P-Net training to improve the detection rate of night faces, then, the ASM algorithm is used to detect the facial feature points, and finally the PERCLOS principle is used to analyze the driving fatigue state. The experimental results show that the method has a high detection rate, can be applied to fatigue detection at different altitudes, and has strong practicability.
The accessibility analysis of Beijing-Tianjin-Hebei railway passenger transport network —— before and after the opening of Beijing-Zhangjiakou high-speed railway
Authors: Sun Renjie , Li Tian , Li Haodong
Published: March 2021

This paper focuses on the changes in the accessibility of railway passenger transport network in the Beijing-Tianjin-Hebei region before and after the opening of the Beijing-Zhangjiakou high-speed railway. It mainly uses for models: a spatial model based on node location, cost model based on travel expenditure, model based on weighted average travel time, model based on economic potential index. These four models, combined with the required data, give the accessibility of the Beijing-Tianjin-Hebei railway passenger transport network before and after the opening of the Beijing-Zhangjiakou high-speed railway. The results of these calculations are visualized and analysed. The conclusions are as follows: (1) After the opening of the Beijing-Zhangjiakou high-speed railway, the accessibility of most cities in the Beijing-Tianjin-Hebei region is found to be enhanced. (2) Accessibility of some cities is found to be decreased in some models. (3) For different accessibility models, the degree of accessibility change of each city is different. (4) After the opening of the Beijing -Zhangjiakou high-speed railway, the accessibility distribution of Beijing-Tianjin-Hebei is still different.
Application of wetting agent in water injection of hydrophobic and difficult permeability coal seam
Authors: Lining Huang
Published: March 2021

On the basis of introducing the mechanism of increasing permeability of wetting agent, taking the comprehensive excavation face of hydrophobic and difficult to penetrate coal seam as the test object, through the test of capillary reverse osmosis in the laboratory, the economic and reasonable concentration of 0.6% wetting agent solution for coal seam water injection is determined. In the field, we use clear water and wetting agent solution to carry out the coal seam water injection test, and make a comparative analysis of the technical effect of coal seam water injection. Using clear water to carry out coal seam water injection, the coal seam wetting radius is less than 0.5m, using wetting agent solution to carry out coal seam water injection, the coal seam wetting radius can reach more than 1.5m. The efficiency of water injection with wetting agent solution is 43.06% higher than that with clean water.
Deepening research on the distribution characteristics of interlayers in marine sandstone reservoirs
Authors: Li Ke , Xu Tonghao , Zhang Yingchun , Wang Kai , Tang Jing
Published: March 2021

At present, CNOOC has a large number of bottom water reservoirs developed by horizontal wells in the production oilfields, but the overall geological reserves of the oilfields are relatively low. The biggest problem facing this type of reservoir development and adjustment and tapping is the separation of the reservoir. The identification and quantitative characterization of the development characteristics of interlayer space. Therefore, in this paper, by formulating standards for the identification of barriers and intercalations, in-depth study of the profile and plane distribution characteristics of barriers and intercalations, and carrying out studies on the anatomy and characterization of the distribution of marine sandstone reservoirs. The results of the study show that the distribution of the study area on the profile is mainly composed of interlayers in the southwest and northwest of the legal person of the study area, with good connectivity and continuity. The distribution of interlayers on the plane is mainly muddy. Mainly with mezzanine, the research results in this paper are helpful to improve the accuracy of the anatomy of marine sandstone reservoir stacking relationship and the characterization accuracy of interlayer distribution, and improve the development effect of this type of reservoir.
Research on Von Bertalanffy model and its application for predicting recoverable reserves and production of oilfield
Authors: Liu Feng , Zhou Ahuan , Yu Linjun , Wang Yue , Yang Fei
Published: March 2021

Water drive type curves are simple, convenient and practical in reservoir engineering, which is widely used in reservoir production performance analysis. However, the commonly used water drive type curve can only draw one curve between water cut and recoverable reserves recovery degree, which greatly limits the application range of water drive curve. At the same time, the fitting of straight line section of water drive type curve is often affected by artificial selection, and the error is large. In order to better describe and reflect the rising law of water cut in different type reservoirs, the new water drive type curve is established, and the relationships between water cut and cumulative production, water cut and recovery degree of recoverable reserves are derived. Through MATLAB software programming and multi parameter fitting method, the parameters in the new water drive type curve can be easily calculated. The f
w-R
* curve shape of the new model includes convex curve, concave curve and S-shape curve. The new water drive type curve is applied to two actual reservoirs. The new curve fits well with the low water cut stage of the Baolang oilfield, and the error is small, which can be used to predict the future production performance of the oilfield. At the same time, the new water drive type curve is consistent with the change trend of the whole production stage of the Saertu oilfield, and the error is small, too. which can be used for the prediction of the whole production period and high water cut stage of the reservoir. The new model expands the application range of water drive type curve and provides reference for production performance prediction of other similar oilfields.
Experimental Study on the Relationship between Three-dimensional Stress Attenuation Value and Strain of Remolded Expansive Soil
Authors: Chi Zecheng , Meng Zhaowei , Xie Linyu , Li Jianbin , Zhang Weipeng
Published: March 2021

This paper studies the characteristic of remolded expansive clay in Hefei. A series of three-dimensional swelling tests were conducted for cubic expansive soil of different initial moisture contents and dry density as well as the swelling pressure tests under the control of the vertical strain and the lateral strain. The research results show that: (1) Under the same initial water content, the vertical displacement of the soil sample is released. At this time, the attenuation value of both the horizontal and vertical expansion force of the soil sample increases with the increase of the initial dry density. (2) The horizontal displacement of the soil sample is released. At this time, the attenuation value of the horizontal expansion force of the soil sample increases with the increase of the initial dry density. Moreover, the horizontal displacement of the soil sample is released in the case of the same initial dry density. And the attenuation value of the horizontal expansion force of the soil sample decreases with the increase of the initial water content.
Study on the Spatial and Temporal Changes of Ecological Land in Lanzhou New District
Authors: Wang Renci , Zhang Xiaoping
Published: March 2021

Based on the land use vector data interpreted by remote sensing and using mathematical statistics, we analyzed the quantity and spatial change characteristics of ecological land in Lanzhou New District from 2013 to 2018. We found that in the five years of rapid urbanization in Lanzhou New District, arable land and grassland have been decreasing, and the area of woodland, garden and waters has increased. The total area of ecological land has continued to decline. From 2013 to 2018, the absolute value of a single land use dynamic degree is garden >waters>woodland>arable land>grassland. The temporal and spatial changes of ecological land in Lanzhou New District are affected by many factors such as natural and social factors. Due to its special strategic positioning in China, we believe that policy factors among social factors have become the main driving force for its development and changes.
Research on Rural Land Consolidation Under the Background of Beautiful Countryside Construction
Authors: Xiong Yufei , Dong Qiguang
Published: March 2021

The continuous development of the city brings the imbalance between urban and rural development, in order to promote rural development, the construction of beautiful countryside, this paper combined with the background of urban and rural development, the rural land consolidation was discussed, and put forward effective measures, hope to be able to provide reference for the long-term development of rural areas.
Application of Industrial Solid Waste in Preparation of Recycled Concrete: A Review
Authors: Zhang Yichao , Li Yuqing , Zhou Jinghai , Huang Jian , Wang Qinghe
Published: March 2021

In recent years, the increasing construction waste and industrial waste has brought great pressure to the environment, and finding a reasonable disposal method has become an important problem to be solved. Using recycled concrete as a new building material can not only protect the environment and achieve sustainable development, but also save construction costs. The large-scale use of recycled concrete will bring significant economic, social and environmental benefits, which is in line with the concept of green and sustainable development. This paper focuses on the feasibility research results on the application of recycled concrete as building materials and industrial solid waste in recycled concrete, and prospects the future development trend.
Two-stage optimization study on location and layout of emergency resources in chemical parks
Authors: Li Dandan , Hou Hanping , Yang Jianliang
Published: March 2021

This paper intends to study the layout of emergency centers in the chemical park in two stages. First, a multi-agent collaborative location model is established to find out the sites of emergency centers. Second, DEA method is adopted to evaluate the efficiency of the existing reserve structure of each center, along with the optimization suggestions for the inefficient center. Finally, the safety system of the chemical park is improved by the combination of the location model and the DEA.
Study on the Carrying Capacity of Coal Goaf Based on Numerical Simulation
Authors: Zhang Feng , Jia Chao , Xu Shuming , Zhang Jianpei , Dong Ruirui , Wang Cong
Published: March 2021

The stability of goaf surface is a key problem hindering the exploitation and utilization of goaf surface. By reproducing the process of goaf formation, the stability law of goaf is explored, and then the concept of load transfer depth is proposed [1], so as to obtain the method of calculating the surface carrying capacity of goaf, providing certain reference for the development and utilization of surface land resources in goaf in China.
Distribution Characteristics of Geological Disasters and Main Control Measures in Shandong Province
Authors: Lv Lansong , Yu Dejie
Published: March 2021

The landforms and geological structures in Shandong Province are relatively complex, and the complex topographical conditions and geological structures have caused a series of geological problems. This article outlines the main types of geological disasters in Shandong Province through literature research and geological survey, summarizes the distribution characteristics and causes of different types of geological disasters in Shandong Province, describes the prevention and control status of various geological disasters, and proposes future research recommendations on geological disaster management. Through the analysis and data compilation of a large number of geological disaster cases in Shandong Province, the research results show that the hidden dangers of geological disasters in Shandong Province are mainly subsidence, landslides, debris flows and ground subsidence, which are mainly distributed in the eastern, southern and central parts of Shandong Province. Its development law is closely related to the topography, stratum lithology, and geological structure, engineering geological characteristics, hydrogeological characteristics and human-made engineering activities of the study area. Existing geological disaster control measures focus on eliminating hidden dangers, but the results of environmental management are few. Therefore, in the future, efforts should be made to research on geological disaster prevention and control engineering based on ecological protection and form ecological management that combines management engineering with natural and human engineering technology. This article aims to systematically introduce the major geological disasters and their distribution characteristics in Shandong Province, make up for the lack of existing research results, and provide a scientific basis for future research on geological disasters.
Research on Landscape Architecture Design Based on Ecological Restoration and Sustainable Utilization
Authors: Zhou Lisha
Published: March 2021

Under the guidance of low-carbon environmental protection thinking, people create low-cost landscape design works through green and healthy design ideas, which will help promote sustainable development from a practical level. Based on the analysis of the relationship between landscape ecology and land, this thesis explores the environmental sustainability of landscape ecology, such as landscape structure and function theory, ecological integrity and spatial heterogeneity, hierarchical scale theory, landscape change and stability theory, etc. Use the interpretation of connotation. Then the macro landscape ecology is introduced into the relatively micro landscape design to further enrich the design concept of modern landscape to meet the new requirements of landscape design development in the new era.
The Stress Analysis of Buried Nature Gas Pipeline in Abrupt Slopes
Authors: Liang Jinqiang , Su Hongli , Sun Shiping , Li Xue
Published: March 2021

The landform of the buried long-distance pipeline is complex and variable, especially in case of mountainous areas, the forces acting on the pipeline is not uniform. We make a calculation on how the gravity of pipeline and fluid in pipeline affects the stress in the bend connected to the front end of the pipeline, and make an analysis of how pipeline parameters and soil parameters affects the stress. We make a stress calculation on the bend with the method of the elastic bending method, and make an analysis of how diameter, thickness of pipeline and angle of slope affect the result of the calculation.
The Analysis of the Test for English Vocabulary Learning Strategies under Relativism
Authors: Wang Suxi , Hu Huiping
Published: March 2021

English words are the foundation and necessary prerequisites for English learning. The amount of English vocabulary that students memorized and mastered directly affects students’ ability to use language such as listening, speaking, reading and writing. The author tried to seek out the ways and strategies which help English learners to mater vocabularies from the point of words relativism. To carry out the process of the research, the author adopted sample surveys, interviews, and word tests to investigate individuals or team-work vocabulary learning. From the result of word tests, the team-work vocabulary learning is superior to that of individuals’. Thus, the author concentrates on analyzing the outer connection of words in the context network, and finds effective ways to establish word exogenous connections. Meanwhile, the inner elements that affect vocabulary learning is equally important, including brain science, learning science, semantic network.
Research on the Correlation between Injection and Production Speed and Casing Loss Trend
Authors: Cao Jinfeng
Published: March 2021

When the oilfield enters the late stage of ultra-high water cut development, the number of wells with casing damage is increasing, which leads to the imperfect injection-production relationship, makes it difficult to effectively use geological reserves, and makes the treatment and repair of casing damaged wells difficult, long in cycle and high in cost, which seriously affects the oilfield development effect and economic benefits. There are many factors leading to casing damage, and injection-production rate, as an important development data, affects various production indexes of oilfield and casing damage rate. Based on the statistical analysis of the injection production rate and casing damage rate in the past 15 years, this paper summarizes the related laws between them and the number of casing damage wells, time distribution, change trend, etc., studies the inter area range of water injection speed and injection production speed difference when casing damage occurs with high probability by well spacing, and formulates reasonable limits of water injection speed and injection production speed difference, so as to provide reference for the benign development of oilfield For reference.
Stability analysis and improvement of coastal soft soil foundation
Authors: Wang Junyi
Published: March 2021

In the construction process of coastal buildings, how to improve the stability of the soft soil foundation of coastal buildings so as to increase its service life is always a problem that needs to be paid attention to and solved in the construction process. In Qingdao sea beach, for example, according to the force of the foundation, the foundation of the wave force and tidal forces modeling analysis, and puts it into the fluid - sand erosion simulation model, the soft foundation in the best shape of certain external environment, slow down the erosion of various kinds of flow strength of foundation. Finally, we conduct sensitivity analysis and conclude that our model has good stability.
Application Research of 5G Network in Coal Mine Communication Field
Authors: Long Ma
Published: March 2021

The mine-used 5G hybrid networking wireless system mainly uses 4G technology to provide voice calls, and 5G technology mainly provides high-definition video analysis, big data transmission and remote wireless control services. In this paper, the mine 5G mobile communication network is mainly composed of ground core network (CN), IP RAN ring network, baseband control unit (BBU), remote data convergence unit (RHUB), micro radio remote unit (pRRU) and other systems, and the application research scheme of 5G network in the field of coal mine communication is expounded, which can also be tailored according to the specific needs of professional users.
A Study of Fracture Penetration Law of Tight Sandstone Gas Reservoir in Block LX
Authors: Li Yu , Yang Shengwen , Zhang Liang , Yao Fengsheng
Published: March 2021

The fracture of tight sandstone gas reservoir in Block LX is characterized by thick sand body and thin gas layer. The production layer is adjacent to water layer and coal fracture, and the longitudinal stress difference of the shielding layer is small. Based on the theory of fracture tip stress intensity factor, this paper adopts core experiment and theoretical analysis method, combined with fracturing engineering geological characteristics and construction parameters, to analyze the fracture penetration criterion and study the influence of construction factors and reservoir geological characteristics on the law of fracture penetration law. The results show that the minimum horizontal principal stress difference of artificial fracture passing through the interlayer is affected by the construction displacement, reservoir thickness and other factors; The construction displacement has obvious influence on the minimum horizontal principal stress when the artificial fractures pass through the interlayer, and the construction with small displacement can prevent the artificial fractures from passing through the interlayer when the stress difference of the reservoir interlayer is less than 3.5MPa. The minimum horizontal principal stress difference of the reservoir layer when the artificial fracture extends to the interface of he reservoir layer can be determined by using the criterion of the artificial fracture behavior and the model of the artificial fracture behavior, which will provide some technical guidance for the field hydraulic fracturing construction.
Research on Development Strategy Based on Financial Analysis of Listed Companies-Take Gree Electric as an example
Authors: Wang Yuanqi
Published: March 2021

With the development of the market economy, financial statement analysis is playing an increasingly important role for business managers, investors and various social stakeholders. The financial statements of an enterprise can not only reflect the cash flow of an enterprise, but also reflect the enterprise’s operating results and specific development strategies. Therefore, using quantitative research methods, this paper compares some financial indicators between the Gree Electric and its main competitors. The results show that Gree must make up the gap in product innovation in order to maintain its leading position in the industry. The study of financial statements is of great value. In addition to mining corporate strategies, it can also provide suggestions for the development of the industry.
Research on the valuation of City Enterprises Based on ARIMA series prediction
Authors: Zhang Siqi , Dai Yifan , Wang Xuan
Published: March 2021

This paper studies the valuation of listed companies on the science and technology innovation board. By establishing the corresponding mathematical model, comparing the stock market valuation level of China and the United States, through multiple data screening and analysis, using factor analysis of variance, time series model and RBF neural network analysis, the paper establishes the valuation and quantitative model of China’s stock market. AR. Regression analysis can accurately measure the correlation between each factor and improve the accuracy of the prediction method. Neural network has very strong nonlinear fitting ability, can map any complex nonlinear relationship, and the learning rules are simple, which is convenient for calculation and simulation. In order to quantitatively analyze the relationship between each factor and the valuation index, the significance test value of the Sino US market can be obtained by using the method of one-way ANOVA, and the ranking of the importance of each factor to the valuation index can be obtained through the analysis. The fundamental index and liquidity index of stock market have certain stability. In order to forecast and analyze the fundamental index and liquidity index of Chinese market and American market, the time series model is used to establish the prediction model for the change of index data.
Research on the Financial Shared Service Center in the “Internet +" Era
Authors: Liu Yanling
Published: March 2021

At this stage, with our country’s social and economic development, market competition is becoming increasingly fierce. How to maintain its own healthy and stable development in the fierce market competition has become a major challenge facing modern enterprises. At present, with the advent of the “Internet+" era, Internet technology has gradually been popularized and promoted, and the application environment is becoming more and more mature. Information management of corporate finance has become an inevitable requirement for the development of the times. Financial sharing in the “Internet+" era is conducive to promoting the implementation of information management of corporate finance, and thus better promoting the optimization and upgrading of corporate accounting work, and maintaining the healthy and long-term development of enterprises.