bluuebunny/crossref_metadata_2025_split huggingface dataset:
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

AbstractIn 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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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.