bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research on Evaluation Method of Gas Environment in Metro Station
Authors: Tian Qing , Hou Yuan , Gao Guofei 
Published: May 2021

Abstract
With the development of rail transit, subway has become one of the main means of transportation in most cities. However, the particularity and tightness of the subway station, the continuous growth of passenger traffic has also brought some negative environmental problems, such as the comfort and safety of subway station staff and passengers. In this paper, a comprehensive evaluation model of gas environment for metro station is proposed. The micro environment quality evaluation index of metro station is divided into two parts, one is the air quality evaluation index, the other is the thermal comfort evaluation index. From the construction and calculation of these two indexes, the comprehensive evaluation of gas environment of metro station is realized. In order to verify the applicability of the proposed method, we collected the environmental parameter data of six subway stations and evaluated them by using the environmental assessment method. The results show that the proposed method can not only realize the evaluation and monitoring of the station environment, but also has great significance for the improvement and decision-making of public transport environment.
Design and Implementation of the Informatization Management System for the Meteorological Station Network Basic Data
Authors: Chen Lihua , Guo Haiping 
Published: May 2021

Abstract
The basic data of the meteorological station network has such problems as inaccuracy, untimely review and inconsistency among operational systems. Aiming to solve these problems, we design an informatization management system for the meteorological station network through the WeChat enterprise. It employs the area verification and the altitude validation based on the digital elevation model, and it performs a regular comparison with the data from the China Integrated Meteorological Information Sharing System. This system realizes the dynamic management for the filling, submitting and reviewing of the station network basic data. It has functions such as intelligent verification of the input data of the station network, efficient and convenient data review, timely reminder message and flexible data service interface. Therefore, the system effectively improves the accuracy of the station network basic data and the review efficiency.
Advances in the Quality Control Methods of Air Temperature Data at Surface Automatic Weather Stations
Authors: Liu Tianqi , Zhang Delong 
Published: May 2021

Abstract
There are errors and deviations in the meteorological data for many reasons. With the increasing scientific requirements for the quality of the meteorological data, the quality control technology of the meteorological data has been explored and developed. The air temperature is one of the routine and important factors in surface meteorological observation with one of the longest observation histories since records began. Therefore, the quality control methods for air temperature data at home and abroad are summarized in this paper. The advantages, disadvantages, and applicability of the methods are analysed.
Simulation of irradiation intensity distribution of electrodeless ultraviolet lamp in cylindrical resonator by CFD
Authors: Guan Jie , Liu Chang , Yuan Hao 
Published: May 2021

Abstract
To improve the catalytic efficiency of the microwave single-mode sintering furnace to heat the catalyst and the carrier to catalyse the oxidation of toluene, the SJ-1 microwave single-mode sintering furnace was modified to place a microwave electrodeless ultraviolet lamp in the resonant cavity. The distribution of pollutants in the reactor and the intensity of UV light were calculated by CFD and visualized. The distribution of UV field can be seen from the results of light field, which provides a scientific basis for the placement of catalyst and a reference for the simulation of UV field. Under the conditions of relative humidity of 50%, space velocity of 6336.93 h−1, input power of 392.8 W, bed height of manganese oxide catalyst is 30 mm, initial toluene concentration of 235.23 mg/m3, input power of 595.3 W, toluene conversion efficiency of 94%. It has certain guiding significance.
Research on the Design Language of Planting Landscape in the Environment of Chengxiang District, Shanghai
Authors: Zhou Fan 
Published: May 2021

Abstract
This Research investigates the planting landscape in the environment of Chengxiang District. The method of visual simulation has been used, and questionnaire survey has been conducted to obtain the visual perception identity of respondents on different forms of planting in different environments. With the statistical analysis, we can get the design language of planting that the respondents have a sense of identity. The results show that the combinations of planting species identified in the environment of Chengxiang District, Shanghai, include: local planting species with extensive line branches are easier to get identity in the environment of Old Chengxiang District; cluster planting can better reflect the vitality of business atmosphere at Shikumen; delicate planting texture and bright color can make people have the identity of local Shanghai culture. Based on these design language, this Research tries to integrate it with the urban environment, so as to make the urban planting landscape inherit the urban context spirit and gain a sense of identity in the renovation of small-scale urban landscape.
Research on the Evolution of Population Distribution and Influencing Factors in Xi’an During the COVID-19 Epidemic Control Period: Based on a Perspective of Multi-source Spatio-Temporal Big Data
Authors: Zhao Kaixu , Zhang Shuaibing , Li Enlong , Chen Xiaolan , Wu Fengqi 
Published: May 2021

Abstract
Under the “ultra-conventional” control measures of the COVID-19 period, urban population distribution is different from usual time. Studying its evolution laws has a certain reference effect for the judgment of urban population aggregations, the division of precise control zoning, and the differentiated management of places during the COVID-19 control period. Based on the data of Baidu heat maps and points of interest (POIs), this paper uses three models of the population density index (PDI), the exploratory spatial data analysis (ESDA) and the geological detector (Geodetector) to analyze the characteristics and the influencing factors of the evolution of population distribution of Xi’an in three stages which are closed control stage, unsealed control stage and slack control stage. The results show that: in the three stages, 1) The value of the PDI and the range of the PDI change in Xi’an continue to increase. The single-day PDI curve shows “low-high-low” changing characteristics from morning to night in and within the third ring zone, and “high-low-high” in the suburb. And, by comparison, it is found that the social vitality of the first and second ring zone is more strongly impacted because of COVID-19 control measures. 2) The overall population density in Xi’an is gradually increasing, this is represented by gradual increase of the very high- and the high-density areas, and continuous decrease of the low- and the very low-density areas. And the centripetal distribution of population density, which is high inside the city and low outside the city, is becoming more and more obvious. 3) The spatial distribution of population density represents obvious high-value clusters or low-value clusters in the three stages, ESDA shows a circle structure of inner heat and outer cold, and this trend continues to be reinforced. 4) The intensity order of influencing factors of the 7 types of facilities on population distribution is: residential communities > catering facilities > living service facilities > healthy facilities > commercial facilities > office places > green spaces and squares, and the influencing factor intensities show a continuous increasing or a continuous decreasing process in the three stages.
Design and Implementation of the Weather Radar Mobile Monitoring System Based on WeChat Enterprise
Authors: Guo Haiping 
Published: May 2021

Abstract
In order to solve the problems of China’s new generation Doppler weather radar observation network, such as the lack of mobile monitoring platform, the untimely malfunction alarm and the slow interaction, a mobile operation monitoring system based on WeChat Enterprise has been designed, which is mainly composed of collection, processing, dispersal and feedback of radar’s operational status information, and interactive communication between different radar facilities and support personnel. This system can realize weather radar operating status monitoring based on cell phone, hierarchical automatic warning of operating status information, automatic video push of maintenance support activities and interactive feedback and exchange of information among maintenance support personnel, etc. Based on this system, the operational monitoring and technical support capabilities of China’s new generation Doppler weather radar are greatly improved, and it plays an important role in promoting the operational efficiency of the weather radar.
Luminescence properties of Li+/Mg2+-doped Cr3+: ZrSiO4
Authors: Zhang Shaobo , Yang Qiuhong , Hu Juan 
Published: May 2021

Abstract
Cr3+: ZrSiO4 ceramics with different concentrations of Cr3+-doped were prepared by a simple solid-state reaction method, and the effect of Cr3+ concentration on the photoluminescence of ZrSiO4 samples was investigated. The X-ray powder diffractometer (XRD) was used to analyze the structural characteristics of the samples. The XRD results show that zirconium silicate has been completely synthesized at 1400°C, which indicates that Cr3+ enters into the lattice of ZrSiO4, but does not change the structure of it. The emission spectra of ZrSiO4 were measured by the fluorescence spectrometer. The strongest emission peak was at 689nm, which was attributed by the 2E-4A2 of Cr3+. The influence of different concentrations of Cr3+ on the luminescence of zirconium silicate was investigated. When the concentration of Cr3+ is 0.1mol%, the luminescence intensity of the samples is the highest. When the concentration of Cr3+ is 0.5mol%, the intensity of the emission spectrum decreases, which is due to the concentration quenching of Cr3+ in the crystal lattice. Finally, the influence of charge compensator ions on the emission intensity of the sample is explored. The results show that the emission intensity of the zirconium silicate samples is improved when the appropriate amount of Li ion is added.
Study on the influence of urban construction land expansion on carbon emission based on VAR Model - a case study of Nanchang City
Authors: Zhou Laiyou 
Published: May 2021

Abstract
In the context of promoting high-quality economic development, it is of great significance to study the relationship between the expansion of urban construction land and carbon emission for the transformation of economic development mode and the implementation of green and low-carbon development. Based on the time series data of Nanchang City from 1995 to 2017, this paper analyzes the relationship between urban construction land expansion and carbon emission by constructing carbon emission measurement model, VAR model, using co integration test, Granger causality test, pulse analysis and other research methods. The results show that there is a co integration relationship between urban construction land expansion and carbon emissions, and Granger causality test shows that urban construction land expansion is the Granger cause of carbon emissions, while impulse response analysis confirms that the impact of urban construction land expansion on carbon emissions at the early stage is not significant, and the subsequent impact increases gradually, and the impact on carbon emissions will reach a stable state when urbanization is mature And put forward policy suggestions.
Study on Evaluation of Urban and Rural High-quality Living Space Based on Accessibility Analysis——Taking Shahe City, Hebei Province as an example
Authors: Meng Yuan , Li Yunqing , Liu Hongjie , Huang Yanchao 
Published: May 2021

Abstract
The change of planning thought from “taking things as the center” to “taking people as the center” requires that the allocation mode of supporting public service facilities in urban and rural residential areas should also change from simple service radius to accessibility analysis. In this study, Dijkstra algorithm is used to analyze the spatial network with the help of the spatial data of urban transportation network and six types of public service facilities. Based on the concept of equalization of urban and rural public service facilities, this paper constructs an evaluation index system of high-quality living space of urban and rural residents based on accessibility, determines the weight by calculating the information entropy of each index, and compares and analyzes the accessibility evaluation results on the scale of urban and rural residential areas. Try to construct the full coverage and partial coverage of the 15-minute living circle of various facilities under four modes of driving at higher or lower speeds and walking for adults or the elderly. The research results show that the hardware construction of the city’s transportation network system and public service facilities is efficient and convenient, with high accessibility and accessibility, showing the characteristics of urban-rural equivalence. However, under the low speed and walking mode, there is still room for layout optimization and improvement of some road systems and facilities.
Modeling and Microstructure Analysis of Three-Dimension Direct Writing for Zn-Al Alloy
Authors: Rong Wenjuan , Shan Zhongde , Wang Jialin , Wang Yongwei 
Published: May 2021

Abstract
This paper presents a systematic numerical experimental investigation of single-track forming of 3D metal melting direct writing. A forming track width was fitted by multivariate nonlinear regression method, and the numerical model had a fair level of uniformity with the experiment results. Two phase flow model based on volume-of-fluid (VOF) method was adapted to build up the coupled calculative models for direct writing deposition and solidification. The results show that when the forming track width approximately equals to the solidification layer width, it is the optimum time for forming the next layer. Based on the above research, the pre-remelting time was proposed, which is helpful to create next layer forming quality, and could also be used to guide the creation of a proper default of process parameters.
Numerical Simulation of Random Vibration Analysis for Ball Grid Array Package
Authors: Luo Wenhao , Su Wei , Dong Xianshan , Nie Zhenhua , Tomar Agam 
Published: May 2021

Abstract
This paper uses ANSYS Workbench (a finite element analysis software) to simulate BGA ceramic packing. The author models fixture, ceramic and metal steel. Then different thickness papers are laid on the BGA product. By random vibration analysis, the natural frequency and mode of the sample are obtained. According the results, the author discusses the relationship between different thickness papers and PSD-frequency curve. It provides a benefit instruction for the design of BGA packing.
Effect of Consecutive 3-yr Sand-Covering on the Physicochemical Properties of Saline-alkaline Soil in Northern Shaanxi, China
Authors: Wang Jian , Yang Chenxi , Li Jinbin 
Published: May 2021

Abstract
In order to study the effect of sand-covering on the improvement of saline-alkali land in in northern Shaanxi, the soil samples of consecutive 4-yr were taken as the research object, and the effects of sand-covering on the physical and chemical properties of the saline-alkali soil in the area were compared and studied by statistical methods. The study found that the soil pH, water-soluble salt content, degree of alkalinity and bulk density of the tillage layer were significantly lower by covering sand than the sand-covering free, and decreased with the extension of the cultivation period year by year. In addition, the soil porosity, available phosphorus and available potassium content increased significantly, and increased with the extension of the cultivation period year by year. The results showed that sand-covering significantly improved the physicochemical properties of the soil in the cultivated layer of saline arable land in the area; with the increase of the cultivation period, the improvement effect increased year by year, which further indicated that sand-covering is an effective measure to improve the salinized arable land in the area.
Research on the Maximum Amount of Reclaimed Asphalt Pavement Based on Balanced Design of Performance and Economy
Authors: Chen Chengyong , Yang Fei , Zhang Huan 
Published: May 2021

Abstract
By controlling the variability of Reclaimed Asphalt Pavement (RAP) and achieving the goal of high content, it is proposed that the milling speed of RAP should be controlled at 5 ∼ 7m / min, the moisture content should not be greater than 2%, and there should be at least two levels of pretreatment technology. The maximum RAP content of AC-25 hot recycling is 50% according to the grading calculation curve under the condition that the current standard grading range and powder binder ratio are not greater than 1.3. At the same time, according to the grading calculation of the project, the empirical formula of coarse and fine aggregate mix to realize the balanced design of utilization and economy is put forward.
Analysis of Cutting Tool Wearing of Tunnel Boring Machines in Singapore Mixed Face Ground Condition
Authors: Su Wenyang 
Published: May 2021

Abstract
During shield tunneling in composite stratum, especially in granite stratum with high rock strength and high-water content, the abnormal damage of disc cutter is frequent. This paper analyzes the law of wear of disc cutter and obtains the wear coefficient, and then predicts the number of disc cutters needed for shield machines in tunneling section and reduces the number of disc cutters needed, so as to reduce the extra cost of shield construction.
Variation characteristics of phosphorus and potassium content in slope farmland
Authors: Guo Zhen , Yang Chenxi 
Published: May 2021

Abstract
It is of great significance to study the effect of different planting patterns on the maintenance of soil nutrients in slope farmland. Compared with planting soybeans, the available phosphorus content of the 2° and 5° test fields increased by 17.89% and 21.02%, respectively, and the 3° test field decreased by 7.87%. In the experimental field for planting soybeans, the average effective potassium content decreased with the increase of slope, and the content of 0-10cm soil layer was higher than that of 10-20cm soil layer. Different planting patterns led to differences in the distribution of available phosphorus and available potassium, but the content of 0-10cm soil layer was higher than that of 10-20cm soil layer.
Research on the Ecological Risk Monitoring and Restoration Evaluation System of Petroleum Exploitation
Authors: Wang Xiaohui 
Published: May 2021

Abstract
According to the characteristics of petroleum development projects, the paper identifies the impact of its ecological environment factors. Among the ecological environment factors, the soil is the most affected, and the accident risk among the acting factors has the greatest impact on the ecological environment. The specific analysis of the ecological environment factors Finally, the corresponding ecological protection measures are proposed.
Study on the Performance Identification of OpenCV in Cashew Nut Shell-based Activated Carbon
Authors: Wang Jingchen 
Published: May 2021

Abstract
The demand for drinking water treatment in Cambodia is extremely urgent, which poses important obstacles to local construction and development. Activated carbon is a commonly used adsorption material in water treatment. In this experiment, Cambodian cashew nut shells were used as raw materials to prepare activated carbon. The total pore volume, specific surface area, pore size distribution, and micromorphology of the activated carbon were tested. Subsequently, using the characteristics of water exchange with air in activated carbon, OpenCV was used to characterize the pore structure and activity of activated carbon, and a mathematical model was established. The results show that cashew nut shell can successfully prepare activated carbon. OpenCV can be used to analyze the pore structure of activated carbon. The efficiency of OpenCV recognition is 94.3%. The pore size affects the ease of entry of water. When the pore size is less than 7.67 nm, water cannot enter. This study provides a feasible solution for water treatment in Cambodia.
Summary of Research on Geomagnetic Navigation Technology
Authors: Zhao Heda , Zhang Ning , Xu Lei , Lin Penglong , Liu Yonglu , Li Xu 
Published: May 2021

Abstract
Summarizes the technical principles of geomagnetic matching navigation, expounds the navigation solution process of MAGCOM, SITAN and ICCP three main matching navigation algorithms, and discusses the application status of geomagnetic navigation technology from the three geographical environments of satellite, air and underwater. It points out the research prospects of geomagnetic matching navigation and provides reference for the research and development of geomagnetic navigation technology.
Study on Irrigation Pattern in Irrigation Area of Semi-arid Region
Authors: Dong Zijia 
Published: May 2021

Abstract
This paper takes 75% precipitation guarantee rate of Taoer River irrigation area in semi-arid area as an example, establishes the economic loss accounting model of irrigation area, studies the predicament of water resources allocation in irrigation area and the economic profit and loss under different irrigation modes in irrigation area. This paper discusses irrigation mode and transition development path. The study shows that in the dry year of 75% precipitation guarantee rate, adjusting the irrigation area diversion plan to make the region III into full surface water irrigation can reduce the loss of 26.23 million yuan. Although the region I and region II groundwater single irrigation than mixed irrigation model loss of 23.33 million yuan, but the development of paddy field to dry field soybean and water-saving total income can increase 1.99128 million yuan. Therefore, under the background of climate change, adjusting the water diversion plan of irrigation area and changing groundwater to dry field will be the transformation and development direction of irrigation area in semi-arid area.
Research on Fengjiashan Reservoir Ecological Compensation Mechanism Based on Ecosystem Service Function
Authors: Tian Ruogu , Meng Zhaowei , Xu Jun , Liu Yang 
Published: May 2021

Abstract
The impact of hydropower projects on the ecosystem is dynamic and complex. Constructing a complete ecological compensation mechanism can ensure the effective progress of ecological compensation. The ecosystem service value of the Fengjiashan Reservoir such as water supply, fish farming, hydropower, water regulation, water resources accumulation, biodiversity, and environmental purification, is calculated with market value method, alternative engineering method and other evaluation methods, and the ecological compensation mechanism of the reservoir is studied. The results show that the value of its ecosystem services is 230,912,700 yuan, and the amount of ecological compensation determined on the basis of ecosystem service functions is 101,866,200 yuan. The main sources of compensation funds are taxes, water surcharges and government financial subsidies.