bluuebunny/crossref_metadata_2025_split huggingface dataset:
Experimental study on the static formation characteristics of carbon dioxide hydrate
Authors: Sun Yuanjiang , Gao Yuan , Liu Lei 
Published: February 2021

Abstract
As the most important greenhouse gas affecting the ecological environment, carbon dioxide is converted into oil, and the large-scale use of primary energy such as coal is increasing. The use of hydrate technology to store carbon dioxide on the seabed is an effective way to reduce the carbon dioxide content in the atmosphere. A set of hydrate formation experiment equipment was developed in this paper to simulate the environment of seabed porous media sediments, and CO2 hydrate was used as the research object to conduct experimental research on hydrate formation characteristics, and to analyze the influence of initial pressure and reaction temperature on the hydrate reaction process. Through a large number of experimental studies, this article mainly obtains the following results: (1) The process of CO2 hydrate formation is an exothermic reaction. As the initial pressure of the system increases or the reaction temperature decreases, the more heat will be released when hydrate is formed in the kettle, and the peak temperature will naturally be higher. (2) The lower the reaction temperature or the increase in initial pressure, the greater the amount of CO2 hydrate formation.
Study on the architectural layout of urban settlements in cold regions based on climate and environmental impact factors
Authors: Dong Junyan , Fu Yupi , Li Kechao , Zheng Bomin , Qu Jichen 
Published: February 2021

Abstract
The outdoor wind environment has a significant impact on the climate of cold-weather cities, and it has been shown that building layout has a significant correlation with the climate environment. This paper takes Changchun, a cold-land city in the northeast of China, as an example to study the correlation between the existing building layout and the wind environment in a cold-land city based on its special climate environment, uses computational fluid dynamics (CFD) simulation technology to analyze the influence of different building layouts on the external wind environment in a cold-land city, explores the building layout mode suitable for a cold-land city based on the obvious characteristics of the climate monsoonal changes, and puts forward certain optimization methods and reference suggestions for city construction.
The OPAHs from hemicellulose pyrolysis tar at different temperature characterization via GC-MS and ESI FT-ICR MS
Authors: Xiao Lingfeng , Hu Song , Jiang Long , Su Sheng , Wang Yi , Xiang Jun 
Published: February 2021

Abstract
The OPAHs from hemicellulose tar are high risk of causing cancer during thermal conversion. Therefore, the distribution of OPAHs in hemicellulose tar at different temperatures characterization via GC-MS and ESI FT-ICR MS. It is found that pyrolysis tar of xylan contain a large amount of furfural and L-glucan by GC-MS. While the ESI FT-ICR MS shows that The molecular mass of OPAHs in the tar mainly concentrate between 200 Da and 400 Da and these compounds are mostly with C atoms from 5 to 25 and DBE values from 4 to 15. Moreover, there are more decarbonylation and decarboxylation reactions with the pyrolysis temperature raise.
Forecast model of airport haze visibility and meteorological factors based on SVR-RBF model
Authors: Liu Dazheng , Jiang Tao , Zhang Yangchun , Wang Yingjie , Pan Xiaotian , Wu Jianping 
Published: February 2021

Abstract
All kinds of meteorological elements near the airport directly affect the dissipation process of fog, which also affects the visibility. The correlation analysis of temperature, humidity, dew point temperature, air pressure, wind speed and other meteorological factors with visibility Runway Visual Range (RVR)and Meteorological Optical Visual Range (MOR)was carried out by SPSS. It was found that the four variables, TEMP, RH, WS2A and PAINS, had great influence. In this paper, the above four variables are selected as inputs to nonlinear fit the RVR value of visibility. Combined with Radial Basis Function (RBF), it is found that SVM-RBF model has better generalization ability and fitting degree.
Study on migration of two acrylate monomers in plastic food contact materials
Authors: Qiu Yue , Li Genrong , Zhang Qing , Tan Chaolan , Xiang Dong 
Published: February 2021

Abstract
The migration rules of acrylate monomers in plastic food contact materials were studied in this work. The migration rules of two acrylate monomers from food packing materials to four different stimulants including pure water, 4% acetic acid, 10% ethanol and isooctane were investigated by supercritical fluid chromatography (SFC) technology. The effects of food simulation species, concentration of ethanol, migration time and migration temperature on the migration amount of acrylate monomers were studied. The results showed that the migration of acrylate monomers in different food simulants were in the order: 10% ethanol>4% acetic acid>isooctane>water. Moreover, acrylate monomers were more likely to migrate in high concentration of ethanol. In the same food simulation, the migration of acrylate monomers increased with the increase of temperature and time. This study can provide theoretical basis and technical support for food safety control in the process of production, storage and transportation.
Research on Comprehensive Utilization and Fruit Vinegar Fermentation Technology of Pineapple Bran
Authors: Huang Hui , Wang Xiaofang , Hu Yuhao , Zhang Li 
Published: February 2021

Abstract
This paper briefly described the biological characteristics of pineapple bran and current status of research on key technology for its comprehensive utilization. Through the study on such production processes as liquid-state, solid-state and liquid/solid-state fermentations to make fruit vinegar from pineapple bran, existed problems and their solutions for current production processes were put forward and a broad prospect for the development of fermenting pineapple bran into fruit vinegar was demonstrated.
Effects of heterogeneity of porous media and wettability on forced imbibition
Authors: Xiao Lianwei , Yao Jun 
Published: February 2021

Abstract
Imbibition, the wetting fluid displacing a nonwetting one, occurs in many natural and industrial applications, such as enhanced oil recovery and CO2 sequestration. The imbibition process is highly affected by wettability, viscosity ratio and injection flow rates, and the competition between these factors become more complicated when the heterogeneity of porous media is involved. In this work, forced imbibition in two-dimensional porous media is systematically investigated with different disorders over a broad range of wettability conditions and flow rates. Results show that the disorder and the wettability have different impacts on the imbibition process under different capillary numbers.
Research on design method of Energy Internet business model
Authors: Wang Shaoran 
Published: February 2021

Abstract
Under the background of high-quality development of China’s energy industry, the high proportion of renewable energy access, the promotion and application of electric vehicles and charging infrastructure, the commercialization of energy storage, and the development of distributed generation are actively changing the development pattern of power grid and promoting the reform of energy production and consumption. As an Internet technology of “comprehensive perception, reliable transmission and intelligent processing”, the Internet of things is gradually becoming a new technology and new field in the field of electric power in the development process of energy Internet. It is very important for energy enterprises to study the business model under the energy internet. Therefore, starting from the business model design method, this paper puts forward the design framework of business model of energy enterprises under the background of Internet of things, and finally studies the existing energy application scenarios, hoping to help energy enterprises adapt to the market.
Road and Landscape Planning and Design of Residential Area Based on Green Ecology
Authors: Yuhan Jiao 
Published: February 2021

Abstract
With the rapid development of social economy, the rapid improvement of people’s living standards and the increase of car ownership, the problems of residential road traffic and landscape are becoming more and more serious. Residential area is closely related to human health and its development is a symbol of urban progress. The planning and design of green ecological residential area has become the focus of common concern in China and even in the world. Based on the concept of green ecology, this paper discusses how to plan and design residential roads and landscape. At the end of this paper, the design method of road and landscape in residential area is analysed through practical application design. It is hoped to provide some reference ideas for future residential planning and jointly promote the construction of green ecology of residential area.
Effect of P2G on Suppression of New Energy Fluctuations and Carbon Capture and Dynamic Simulation of Gas Pipeline
Authors: zhai Jiang , Li Yalou , Li Fang , Zhou Xiaoxin 
Published: February 2021

Abstract
The rise of power-to-gas (P2G) technology provides an effective way for the absorption of low-carbon intermittent energy sources such as wind energy and photovoltaics. At the same time, the application and promotion of power-to-gas (P2G) are beneficial to the realization of carbon-neutral goals and realize carbon recycling. This paper analyzes the principle of the power-to-gas process, including the two steps of power-to-hydrogen (P2H) and methanation, and analyzes how to use a power-to-gas facility to increase the grid-connected ratio of new energy power generation and alleviate wind and solar abandonment. This paper proposed a solution to the above problem, and analyzed the effect of power-to-gas on carbon capture, at the same time calculated the number of carbon emissions that can be reduced in the unit of energy produced, and finally, we can conclude that power-to-gas is effective in stabilizing new energy volatility and carbon neutrality and have significant social benefits and economic value. The main component of natural gas is methane, so the methane produced by P2G can be directly injected into the natural gas pipeline. Since the rate of methane production fluctuates frequently. Therefore, it will cause frequent fluctuations of the gas in the pipeline, which may cause the gas pressure, flow, and pipeline pack to exceed the limitation. This paper uses the method of characteristic to solve the differential equation of the pipeline to analyze the dynamic fluctuation process of pressure, flow rate, and pipeline-pack, and finally compared with thermodynamic calculation to verify the correctness of the algorithm.
Research on Scrap Recycling of Retired Civil Aircraft
Authors: Zhao Dan , Guo Zhongbao , Xue Jinqiao 
Published: February 2021

Abstract
With the acceleration of the decommissioning of civil aircraft and the huge economic and environmental benefits, how to dispose and recycle the waste materials of decommissioned aircraft has become an important issue to be solved urgently. This article first introduces the current status of the international aircraft dismantling and recycling industry, and then elaborates the scrap recycling technology of the retired aircraft from the second-hand aviation material market, metals and composite materials, respectively. Finally, the positioning and advantages of the main aircraft manufacturer are clarified, and the future prospects for the field of dismantling and recycling are put forward.
Quantifying the effectiveness of early warning systems for heavy air pollution based on public responses
Authors: Wang Fangping , Fei Su 
Published: February 2021

Abstract
Air pollution is a major environmental and public health issue in China. Air pollution warnings are issued with the aim of allowing individuals to take protective measures and mitigate risks. Because these warnings are only reminders and not mandatory instructions, public responses play a vital role in the effectiveness of Early Warning Systems (EWSs) for heavy air pollution. However, public responses have never been considered in the evaluation of EWS effectiveness. To address this knowledge gap, a method is proposed to incorporate public responses in the assessment of the effectiveness of EWSs. Warning effectiveness was based upon costs associated with public responses and non-responses, and the minimization of total costs. Health harm was assessed based on an exposure-response relationship, and health effect terms were used to determine the cost of non-responses. In addition, willingness-to-pay values for health protection measures that reduce the risk of dying or getting sick from air pollution were used to determine response investment costs. A Monte Carlo simulation model was then designed to simulate the uncertainty of the warning issuance and public behavior. In addition, numerical experiments were performed to evaluate the model. Experimental parameters were based on the air quality index and warning response surveys from individuals in Beijing, and the effects of air pollution warning issuance were evaluated using model parameters based on several specific scenarios. The results indicated that the current warning threshold used in China is acceptable for optimizing public response. The results also suggested that positive actions taken by people to reduce health risks can improve the effectiveness of EWSs. The model proposed herein can be used by policy makers and governments to monitor and improve air pollution EWSs. In addition, the model and the results presented here are of use for investigating the improvement of global air quality EWSs.
Population weighted distribution of PM2.5 in 31 provinces in China
Authors: Wen Jing , Zheng Shufen , Zhao Yurong , Shen Deshun 
Published: February 2021

Abstract
The traditional calculated PM2.5 based on the simple arithmetic average method (SAAM) is not adequate enough to reflect the influence of air pollution to public health and the exposed public. Considering the exposed population to air pollution, this study calculated PPM2.5 in 31 provinces in China by using the population weighted arithmetic average method (PWAA). The study shows that in 2018, most provinces have a significant difference between the populations weighted PM2.5 (PPM2.5) and the simple average value (PM2.5) in which Qinghai and Sichuan have the highest differences. Moreover, from 2013 to 2018, PPM2.5 based on 346 cities is higher than PM2.5 and the differences grow in escalation. Thus, compared with the SAAM, PPM2.5 based on the PWAA can reflect explicitly the impact of air pollution to the exposed population.
Analysis on Galloping Properties from Transmission Line Vibration Data
Authors: Zhao Bin , Li-chun Zhang , Jia-lun Yang 
Published: February 2021

Abstract
At the beginning of 2020, a large-scale cold wave has affected the Bohai rim and central China, causing icing and galloping of transmission lines in Beijing, Tianjin, Hebei, Liaoning, Shandong, Hubei and other places, and causing some lines to trip. In this paper, the the temperature and other real-time data of line condition were considered, and a real-time analysis algorithm of galloping characteristics was proposed. In the process of this cold wave, a galloping phenomenon is recorded and analyzed in detail, which provided scientific and technological support for galloping prevention and control.
Research on strength distribution of natural pumice concrete based on precast porosity
Authors: Yan Bai , Hailong Wang , Yongjiannan An , Aize Li 
Published: February 2021

Abstract
In this study, the rubber natural pumice concrete was taken as the research object, and the orthogonal test method was employed to design the experiment, the rubber particles were added to the concrete as precast pores to test the actual porosity, compressive strength and splitting tensile strength of the natural pumice concrete under different precast porosities. According to the change rule, the actual porosity, compressive strength and split tensile strength distribution were respectively fitted. The results show that there is a good correlation between the actual porosity of natural pumice concrete and the precast porosity, and then the empirical formula of rubber particle content and concrete strength is established, which provides a certain theoretical reference for the research on the porosity of natural pumice concrete.
Combustion experimental analysis into effects of interaction between blended coals on the NO emission
Authors: Chen Yuanjing , Su Sheng , Hu Song , Xu Jun , Xu Kai , Wang Yi , Xiang Jun 
Published: February 2021

Abstract
In studies of blended coal combustion, blending methods have an effect on NO emissions, but few experimental studies investigate the coal combustion in different height of furnace. In order to compare the effects of different blending methods on the NO emission during combustion process, bituminous coal, anthracite and their blended coal were burned in various modes in a two-layer and layer distance adjustable reactor. The results showed that NO emission of blended coal decreased nonlinearly with the blending ratio of bituminous coal (BBR) increasing. It indicated that interactions between component coals affected NO formation, leading to different NO emission in these three blending methods (two in-furnace blending methods and one out-furnace blending method). Compared with other methods, the in-furnace blending method (bituminous coal on the upper layer and anthracite on the lower layer) showed a great potential to reduce NO emission. Particularly, when the layer distance increased to 200 mm and the BBR is 70%, the NO emission reached the lowest.
Mathematically modeling action potentials in myelinated neurons to examine the role of myelin, ion channel density, and myelinated lengths on conduction
Authors: Ji Jiayi 
Published: February 2021

Abstract
Since the seminal work of Hodgkin and Huxley, which quantitatively described the propagation of electrical signals through neurons, there has been much investigation into the electrical and geometrical properties of neurons and how they affect conduction velocity along a neuron’s length. To study human neuron behaviors, mathematical models have expanded upon Hodgkin and Huxley’s models to incorporate the effects of neurons that are myelinated by modeling myelinated portions of neurons as passive cables.
Here, we present a developed mathematical model that discretizes a myelinated axon length and finely allows for control over a number of important electrical and geometrical properties. Using this model, we present and compare how myelin, inter-node length, and ion channel density affect conduction velocity in two different lengths of axons. We confirm that myelination, internode-length, and ion channel density correlate positively with conduction velocity, and propose potential mechanisms of this effect at lower node length and inter-node length values.
Study on Land Use and Precipitation Changes in the Main Urban Area of Kunming in the Past 40 Years
Authors: Zhang Yan , Luo Yi , Su Hong 
Published: February 2021

Abstract
Based on the land use data of Kunming main city in 1980, 1990, 2000, 2010 and 2020 and the precipitation data of Kunming meteorological station in 1980-2019. Used anomaly analysis and Manner-Kendall methods to analyze land use changes and precipitation trends in the main urban area of Kunming. The results show that under the background of urbanization, the land use change in Kunming main city is obvious, and the construction land area is obviously increased. The annual precipitation level showed a downward trend, the annual precipitation days decreased significantly, and the extreme precipitation days increased. The change of land use has obvious influence on precipitation events.
Management Point Cloud Data based on GeoSOT-3D Subdivision Model
Authors: Liu Zhongyue , Guo Xian 
Published: February 2021

Abstract
Owing to the rapid development of earth observation technology, the volume of point cloud dataset is growing rapidly. The efficient management and retrieval method is very important for effective use of the large point cloud datasets. Current methods for point cloud data management are generally based on file which makes it difficult to describe internal structure of the modelling objects, while current indexing is generally based on coordinates which is quite time-consuming for large volume cloud point data. To solve these problems, we proposed a method to manage and index point cloud data with a global grid model GeoSOT. The subdivision model of three-dimensional point cloud data was defined to identify the global position of point clouds and internal points with GeoSOT-3D grids. The management and indexing of point clouds were implemented based on the GeoSOT-3D grid codes integrated with the metadata table. A 3D prototype platform for showing the method was developed based on the Cesium. Experimental results show that our method is able to manage, query, visualize massive point clouds as well as other data sources in a unified global position framework.
Preliminary Design of Aircraft without Vertical Tail
Authors: Liu Mingzhe , Cui Can , Sun Jian 
Published: February 2021

Abstract
According to the development of international military equipment, the mainstream fighters in the first half of the 21st century will be the sixth-generation fighters. Today, one of the characteristics of the sixth-generation fighters may be “no vertical tail”, so this work will explore the absence of vertical tails in this paper. Under the premise of a stable surface, the preliminary aerodynamic shape design of the sixth-generation fighter. And to study the openloop and closed-loop dynamic control characteristics of such aircraft. Finally, the preliminary design scheme of the aircraft without vertical tail is obtained.
Research on the Transformation Area Deformation of Topographic Map Under the Background of “Multi Conformity”
Authors: Yong Lei , Lihui Wang , Zhu Chen , Chuanjian Ren , Zhihong Wang 
Published: February 2021

Abstract
The urban independent coordinate system based on CGCS2000 has a relatively strict conversion correspondence with CGCS2000 coordinate system. Based on the surveying and mapping technical force of class a unit, the conversion of control points can be realized and high precision can be achieved. In the process of topographic map transformation, due to the influence of side length projection deformation, it will have an impact on the area of engineering construction plot. Through the coordinate conversion function of the digital mapping software, the topographic map is transformed to explore the change rate of the converted area and provide decision-making basis for the planning and construction departments.
Study of the Site Class Index Chart of Larch Plantation Based on the Mitscherlich Model1
Authors: Jiao Youquan , Feng Ji 
Published: February 2021

Abstract
In this paper, 196 plots and 460 larches were selected as the material, and analyzed the oriented exponential order site class index curve model of larches located at Wangyedian in Chifeng City, Inner Mongolia. The forestal statistical analysis software (SPSS 18.0) was used to data fitting and analytic comparison of larch plantation data. The results showed that: the oriented Mitstcherlich curvilinear function was the more appropriate model of oriented larch plantation site class index curve after comprehensive considering of fitting accuracy, curve trend, distribution trend of sampling points and residual distribution. Based on regressive Mitstcherlich model, the paper selected 30a larches planted and operating level confirmed the exponential distance is 2m with 12 exponential orders, and then drew the site class curve cluster. Furthermore, the 12 exponential orders site class index table of larches located in Wangyedian, Chifeng City, Inner Mongolia was worked out.