bluuebunny/crossref_metadata_2025_split huggingface dataset:
Analysis of pH and Conductivity Variation Characteristics of Coal Gangue Used inFreeway Subgrade and Its Correlation
Authors: Song Guangyuan , Hui Bing , Cui Yanji , Ran Deqin , Li Yanpei , Zhang Wenjun , Song Haimin , Fan Xiangxi , Meng Lingxiao 
Published: January 2021

Abstract
Coal gangue is a common solid waste in coal mining area, which causes great environmental pollution. Using coal gangue as filling material of highway subgrade can turn waste into treasure. In order to study the greening situation of the road section with coal gangue instead of soil as subgrade filling material, the pH and electrical conductivity (EC) were studied, The electrical conductivity (EC) and pH value of coal gangue used in a highway subgrade test section under different soaking time and initial pH solution were measured, and their change characteristics were analyzed. Both of them increased with the extension of time, and the change trend of EC was more severe. The results of correlation analysis showed that pH and EC were highly positively correlated, and the correlation coefficients were 0.7941, 0.8198 and 0.8639 at initial ph4.1, 5.2 and 6.5, respectively. On the whole, pH is proportional to EC. By mastering the change characteristics and correlation between pH and conductivity of coal gangue under different pH conditions, it can provide certain data and theoretical support for the greening research of coal gangue as subgrade filler.
Numerical analysis of excavation stability of transfer station of Jinan Metro
Authors: Li Hu , Wei Ruchun , Zhu Henghua , Jia Chao , Shang Hao , Wang Xin , Li Shuang , Shi Guoping 
Published: January 2021

Abstract
The influence of the excavating deformation on the surrounding environment should be extremely controlled in the excavation of metro transfer station and it is important to study the stability of excavation. Here we establish three-dimensional finite element models with the fluid-solid coupling effect aimed to perform analysis on the stability of excavation based on the background of the Jinan metro transfer station in this paper. The location is determined through simulation in which the maximum horizontal displacement of diaphragm wall appears as well as the maximum ground surface settlement. The research results can provide useful reference in analysis and calculation for other similar underground engineering excavation and construction design.
Dynamic changes in maize NDVI and its response to drought in Liaoning province from 1998 to 2018
Authors: Ji Ruipeng , Yu Wenying , Wang Qian , Liu Dongming , Feng Rui , Wu Jinwen , Zhang Yushu 
Published: January 2021

Abstract
In order to study the normalized difference vegetation index (NDVI) of maize and its response to drought, this paper analysed the relationship between maize NDVI and drought in Liaoning province. Based on the meteorological data and NDVI data from 1998 to 2018, this paper analysed the spatial and temporal variation of maize NDVI and identified the drought occurrence in the growing season with the evaporative demand drought index (EDDI). The effect of drought disaster on maize NDVI was carried out by comparing maize NDVI and EDDI. The results could provide a basis for drought loss assessment and drought disaster prevention of maize.
Discussion on Ecological Protection Technology of High and Steep Slope of Expressway
Authors: Wei Chungen , Huang Kaicheng , Zhang Nan , Qin Xiaochun , Siddique Aboubakar 
Published: January 2021

Abstract
The construction and development of expressways have played a positive role in promoting regional economic and social development, but the construction process and behaviour have caused disturbance to the original landform and caused various damages to the slope. It is currently reasonable protection of the slope is one of the important works of highway construction. This article takes the Huizhou-Qingyuan section of the Shan-Zhan Expressway as an example, analyses and studies different slope ecology from the three aspects of the slope ecological protection mechanism, the slope ecological protection difficulties and the slope ecological restoration design, combined with the current situation of the slope along the line and the main restoration difficulties. This article studies the principles, forms, characteristics of protection technology, and the design of typical slope ecological restoration. The results show that reasonable ecological protection of slopes according to local conditions can achieve slope protection, prevent soil erosion, restore and improve the local ecological environment, and improve highways. The integration and coordination of road landscape and natural landscape are of great significance to ecological environmental protection and driving safety.
Research status and Prospect of initial damage of rock mass in laboratory
Authors: Liu Cong , Yao Chunling , Zhang Songyuan , Cheng Yong , Nie Qi , Liu Zhennan 
Published: January 2021

Abstract
Rock has experienced hundreds of millions of years of geological activities, and there must be defects of multi genesis, multi type and multi-scale, which often become the core factor limiting the function and safety of rock. In this paper, the initial damage of rock mass is taken as the research object. Based on the literature research, the development process of initial damage of rock mass in the laboratory is summarized. The scale classification, fracture preparation method and fracture observation method of initial damage are described respectively. On this basis, this paper analyzes the problems encountered in the current research of initial damage means, points out the key areas that should be paid attention to in the future, and lays a foundation for the further development of rock mechanics.
Research on Construction of Industrial Environment System of Cross-border E-commerce in Free Trade Zone Based on Geological Environment Assessment Method
Authors: Yang Ning , Wang Chuang , Fu Yijie 
Published: January 2021

Abstract
Based on the regional engineering geological environment conditions, the thesis divides the engineering geological environment evaluation types into single-element evaluation and comprehensive evaluation, and uses analytic hierarchy process and fuzzy mathematical model to carry out comprehensive evaluation of engineering geological environment. On the basis of single-element evaluation, comprehensively analyze the factors that affect the stability of the site, the factors that determine the stability of the foundation, the degree of groundwater impact, and the factors of the drainage conditions of the site. In order to conduct a comprehensive analysis. Finally, combined with the results of single factor evaluation and comprehensive evaluation, it analyses it impact on the cross-border e-commerce industrial environment of the free trade zone.
Research on spatial feature differentiation of basin river network geomorphology based on multifractal algorithm
Authors: Wang Shengwei , Ji Hao , Wang Xin 
Published: January 2021

Abstract
Using multi-fractal algorithm to scientifically quantify watershed morphology is one of the hot spots of geomorphology research. In this paper, based on the DEM data of the Northwest China Basin (Daxiahe), the remote sensing images of the Daxia River Basin were processed. The multi-fractal model was used to extract and analyze the multi-fractal characteristics and quantified characteristic parameters of the Daxia River and 7 sub-basins of the river system, and discussed the geomorphic significance of the spatial characteristics of the watershed. The results showed that the multi-fractal spectrum of the watershed was in the shape of a right hook (Δf < 0). The span of the singular index Δa was between 0.860 and 1.160, and the value was relatively small. This indicated that the Daxia River watershed was evenly distributed in most areas, and the water system was not fully developed. The average values of the multi-fractal spectral height difference (Δf) and the singular index distribution range (Δa) from downstream to upstream were increasing (1.184∼1.570) and decreasing (1.160∼0.933) in sequence, which indicated that the proportion of the geomorphic unit with the smallest slope in the watershed increased sequentially from downstream to upstream, and the change of geomorphic shape from upstream to downstream tended to be complicated. This study is of great significance to effectively solve the complex problems in geomorphology and to master the characteristics and laws of various geomorphological phenomena.
Chemical analysis of lake water quality
Authors: He Yiqun 
Published: January 2021

Abstract
Mono Lake is a large salt lake located in the Great Basin of North America. With the change of climatic conditions and diversion scheme, the inflow of fresh water also varies greatly, which makes the content of anionic cation in Mono Lake also changes. We detect the change of material concentration and anion content in Mono Lake by the change of geographical position and water level of Mono Lake. We also compared the content of anions and cations in average spring water and average stream water. Find out the characteristics of the ion content in Mono Lake and try to speculate the reasons. Through the analysis of the relationship between different anions and cations, PH concentration factor and molarity change in ordinary water, and the inference of the cause of their change, the changes of anions and cations composition in mono Lake Water with the change of water level were detected.
Characteristical analysis of tidal and residual currents in the sea area around Tangshan international tourism island
Authors: Yang Jinzhi , Ding Wenping , Cui Jiaxing , Guo Shan 
Published: January 2021

Abstract
For the sea area around Tangshan international tourism island, continuous conservation of ocean current at 3 stations were carried out. The harmonic analysis was conducted based on the measured data. According to the harmonic analysis results, the flow velocity, type, movement form of tidal current and residual current distribution were researched finely. The results show that the sea area was dominated by regular semi-diurnal tidal currents. The movement form of tidal current was reciprocating current, and the trend of residual current presented regional differences. The research had an important practical significance for the resource development and marine engineering construction of the sea area.
Research Status and Future Development Direction of Chinese Sports and Geographical Environment
Authors: Qiu Zhenyu 
Published: January 2021

Abstract
The formation and development of sports events originate from a specific geographical environment. At present, the research on sports and geographical environment in China is relatively weak compared with foreign countries, and the breadth and depth of research are also a certain gap. The related research of the environment is integrated, and the research in this field is mainly concentrated on the following aspects: 1. The impact of the geographical environment on sports, including the relationship between the generation of sports events and the geographical environment, and the geographical environment on the performance of sports competitions Impact, climatic conditions on sports, etc.; 2. The impact of geographic environment on sports participants includes the training methods, methods and physiological functions of athlete groups, and the effects of physical exercisers' physical behavior and physical health; 3. The relationship between sports and environmental protection and other aspects. At the same time, it also made a rough prediction on the future research directions in the field of sports and geographical environment, in order to be able to contribute to the research in this field.
Reliability analysis of numerical simulation of compression of coarse-grained soil foundation
Authors: Bai Xiyu , Zhang Wenxian 
Published: January 2021

Abstract
In order to study the reliability of numerical analysis in the calculation of foundation compression, this paper takes the coarse-grained soil foundation of a project in Milin, Tibet as the research object, uses the mechanical parameters obtained from the large-scale triaxial test and the numerical analysis of ABAQUS software to analyze and compare the compression value and load. It is considered that the load and compression situation in the numerical analysis are relatively reliable, which comprehensively reflect the stress and strain of soil under overlying load. It can be further studied according to the change of boundary conditions in engineering application.
Research on Express Information Extraction Based on Multiple Sequence Labeling Models
Authors: Yu Bihui , Wang Ke 
Published: January 2021

Abstract
With the popularity of online shopping, the logistics industry has developed rapidly. Major logistics companies have greater business needs to improve the efficiency of express sorting centers. Therefore, the technology of optimizing the efficiency of the express sorting system in the logistics industry and reducing the cost of time for customers to fill out express orders has received increasing attention from the society. The research work carried out in this paper is based on deep learning using natural language processing technology to extract express single text information, structured extraction of names and mobile phone numbers and addresses. The main content is that the express information structured extraction system automatically extracts information such as name, telephone, province, city, district, and detailed address. The docking of the express delivery sorting business system will help improve the logistics industry's operational capabilities. In this paper, four sets of sequence labeling models are constructed. Through multiple sets of data evaluation, it is shown that the model based on ERNIE and the learning rate decay strategy using Adam optimizer is superior to the current CNN, RNN, LSTM models. The highest F1 of the model constructed in this paper reaches 0.99473.
An FPGA-Based System for Remote Data Monitoring of Underwater Gravity Measurement
Authors: Liu Yilin , Yu Ruihang , Cao Juliang 
Published: January 2021

Abstract
Considering that underwater gravity measurement has the characteristics of a large amount of data and poor communication conditions, a data transmission link based on FPGA and wireless network is designed. The build of the wireless network could get rid of the dependence on cable and increase the adaptability to the working environment onboard. The multi-level wireless network is easy to expand and the compatibility and extension of equipment are better than the traditional wired transmission by cables, which enables devices to keep safe by working in the room rather than on the deck. In this condition, FPGA (Field Programmable Gate Array) can be used to preprocess the gravimeter data, and process the original miscellaneous data information into a short and effective data frame, which effectively reduces the communication pressure and makes the data transited by wireless network possible. The experiment shows that the design can effectively transmit the effective data collected by the deep-sea gravimeter and display the data in real-time on the remote computer when the mobile network bandwidth is about 1Mbps.
Discussion on efficient exploitation technology of tight glutenite reservoir in Daqing
Authors: Shui Haiyan 
Published: January 2021

Abstract
In XuShen gas field, due to the big lateral change of reservoir, accurately find the glutenite reservoir dessert area is difficult, Reservoir density and physical property is poor. Vertical Wells are the main wells in developed gas Wells, Inconsistent activity appeared in the process of mining action: high Shut-in pressure. low gas well production and poor stable yield ability. In urgent to tackle key problems are capacity breakthrough long-term stable process and techniques of high economic benefit. By carrying dual branch horizontal well development, successfully realized effective use of reservoir and high-efficient development of gas field.
Research on A New Type of Excitation Device Applied to Structural Vibration Modal Identification and Structural Vibration Reduction
Authors: Fan Xinkai 
Published: January 2021

Abstract
In order to reduce the frequency of major safety accidents in the bridge construction process, and to realize the real-time monitoring and accurate monitoring of the bridge construction process, a novel excitation device for vibration modal identification and structural vibration reduction is proposed in this paper. The excitation device mainly takes the rotating eccentric mass actuator as the core, uses the centrifugal force of the rotating mechanism to provide internal excitation to the structure, and has the advantages of easy control, low energy consumption, low cost and so on. The research results show that the exciting device has a wide application prospect in structural vibration modal identification and structural vibration reduction, and can effectively reduce the frequency of major safety accidents in the process of bridge construction.
Construction Technology of Concrete Composite Box-beams Strengthened with Pre-stressed CFRP Sheet
Authors: Long Xincan , Zhou Chuanlin 
Published: January 2021

Abstract
CFRP plate is a new type of material with a serial of advantages such as high tensile strength, small contraction, environmental corrosion resistance and etc. The reinforced technology of CFRP plate not only can effectively improve the bearing capacity of components, stiffness, crack resistance and ductility, but also the original size and weight increase very little. Based on strengthen Xinshu Bridge, the paper introduced in detail the construction process and construction method, which is of great significance for guiding construction.
Additive manufacturing technology and its application in die manufacturing
Authors: Hao Botao , Lin Guomin 
Published: January 2021

Abstract
The increase of material manufacturing because of its direct forming characteristics and is widely used in aerospace, automobile manufacturing, mold manufacturing, medical equipment and other fields, this article, based on the characteristics and advantages of increasing material manufacturing, molding principle to increase material manufacturing technology and process as the research object, analyzes the material manufacturing technology on the accompanying cooling water mold, tire mold and the application of the large mold manufacturing.
Studies on the perspectives of replacing the classic energy plants with Jerusalem artichoke and Sweet Sorghum, analyzing the impact on the conservation of ecosystems
Authors: Nenciu F , Vladut V 
Published: January 2021

Abstract
To accurately predict the impact of various species of plants on environment is a very difficult task, because their characteristics and specificities together with the external conditions of climate and fauna lead to very complicated systems that are difficult to analyze. The paper aims to assess two technical plants that may be used for the production of biofuels, namely Jerusalem artichoke and Sweet sorghum in evaluating fuel production efficiency and the possibility of being regarded as a viable solution for ecosystem conservation.
Electric Vehicles over Contemporary Combustion Engines
Authors: Upadhyay Abhishek , Dalal Mihir , Sanghvi Naman , Singh Vaibhav , Nair Sheeja , Scurtu Ionut Cristian , Dragan Cristian 
Published: January 2021

Abstract
IC engine or internal combustion engine have been dominating the automotive since its inception. Although it seems quite skeptical but the first electric vehicle was developed around 1890 by William Morrison. During early 1900s around 40% of cars were electric, 38% on steam and mere 22% on gasoline. Due to range, capacity and also power produced by electric vehicles made them obsolete. The research paper focuses on how electric vehicles are not only comparable but better than internal combustion engine in many ways. Various studies and Simulink proves that electric vehicle is going to be the future of transportation.
Outdated Ships and Their Future During (Non) Pandemic Times
Authors: Nica-Rus Livia , Kaiter Edith-Hilde 
Published: January 2021

Abstract
Starting from the reality of our times, namely that the maritime and river transports are the cheapest, but also the most long-lasting ones regarding the current types of transport, this paper aims at new perspectives regarding the future of the use of both civil and military ships. Along with other objects and processes, ships must learn to adapt to a rapid changing world.
The following issues will be considered: (1) Creating a picture of the future, as plausible as possible, taking into consideration even the pandemic times. (2) The way in which shipping will be positioned in the future. The role shipbuilding may play on the scale of the large global players, taking into account the demographic and economic charts (population growth and life expectancy, involvement in the workplace etc.). (3) What will happen to the old military ships in the event of demilitarization? (4) What would the floating homes and communities of the future look like?
In conclusion, reconversion of old (military) ships in civilian transportation and/or mobile dwellings would be a good approach from the point of view of economics and human resources.
Investigation of the Effects of Drilling on Mechanical Joints in Composite Structures
Authors: Fathi Pourya , Petrudi Amin Moslemi , Scurtu Ionut Cristian 
Published: January 2021

Abstract
The use of a variety of composites due to their superior properties, which include low weight, high strength, and high corrosion resistance, which are generally many applications in the aerospace, automotive, and marine structures have increased significantly. Fiberglass reinforced composites have several industrial applications due to their suitable mechanical and physical properties. Drilling is one of the common methods for connecting structures made of reinforced materials with fibers. Composite structures usually result from the joining of members to transmit and tolerate incoming forces. One of the methods of connecting the members, due to the ease of maintenance and repair, is the mechanical connection through screws or rivets, which inevitably must create holes in these members. Composites as materials that are difficult to machining, drilling these materials can lead to delamination and, in some cases, degradation. In this paper, the effects of drilling on mechanical joints in composite structures and solutions to prevent damage to them due to drilling are investigated.
Micro-Structural characteristics of Additively Manufactured Pure Tungsten
Authors: Abbas Mirza Atif , Anru Yan , Wang Zhi Yong 
Published: January 2021

Abstract
In this study, fully dense tungsten samples were additively manufactured and the micro-structure behavior was studied. A crack network with a spacing of 20μm up to 100μm was found in the designed samples. It was noticed that the laser scanning approach, which could customize the microstructure, affected the crack behavior in manufactured tungsten[1]. Different additive parameters were adopted to study the microstructure properties, but it was revealed that cracking is practically irresistible in AM (additive manufacturing). It might be achieved that cracking chain assembled because the cracks appeared in each laser fused path and then analogous in the surface-by-surface structure course.