bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research on Air Purification Wall Based on Heat Exchange Principle
Authors: Wang Libo , Peng Bowen , Cheng Tianyi , Shou Yejun , Shao Xinzhe 
Published: June 2020

Abstract
With the acceleration of urban modernization, the use of prefabricated buildings on construction sites is increasing year by year. However, the following problems arise: the environmental quality of construction sites in our country is poor, the living comfort of prefabricated buildings is low, the recycling rate is low, and the indoor air is dirty, affecting the health and comfort of indoor personnel. Therefore, it is of great significance to complete the new wall for indoor air purification. Through the design of the three-layer interlayer, the heat exchange between the inside and outside air and the purification of the indoor air are realized, and a new type of movable plank house wall with low price and simple and ingenious structure is designed, which not only can improve the living comfort inside the plank house, but also can ensure the maximum embodiment of the energy-saving benefits of materials. The experimental results show that the indoor air quality of the air purification wall based on the heat exchange principle is improved by 21.6%, and the indoor temperature change in the air purification process can be effectively avoided.
Air Water Intake Device Based on Peltier Effect
Authors: Chen Zixuan 
Published: June 2020

Abstract
This paper designs an air intake device based on Peltier effect to solve the problems of insufficient per capita water use and difficult survival of living organisms in water-scarce areas in China. It uses semiconductor to refrigerate, takes water from the air in a cooling condensation way, uses wind power and solar energy to supply power for the refrigerator continuously. Through data analysis, the device can effectively collect air moisture and condense to produce liquid water, which has broad application prospects in arid areas in northwest China.
The utility model relates to a shoe - wearing device for the aged
Authors: Peng Yucheng , Wang Yanlong , Li Ruipeng 
Published: June 2020

Abstract
This paper introduces a new way of wearing shoes for the elderly who live at home. Through repeated dimensional design and mechanical design of multi-degree of freedom shoe opening, it can adapt to the leg shape of most old people. The operation process of the combined device is simple. The old man only needs to apply a force to clamp the shoes, and the shoe mouth is stuck, which greatly facilitates the old man to put on shoes and slippers, so that the old man can complete the operation of putting on shoes and taking off shoes without bending over on the chair. This device in compliance with the national standard premise, superior performance, complete functions, low cost, high use value, has a broad market prospect.
Design of Fire Fighting Simulation Training System Framework for Dangerous Chemical Storehouse
Authors: Li Chiyuan , He Changyuan , Li Weichao 
Published: June 2020

Abstract
In recent years, fire and explosion accidents occur frequently in dangerous chemical warehouse in China. It has become an important problem for fire department to extinguish the fire in large dangerous chemical warehouse. In order to enhance the training effect of these fires, this paper introduces the simulation training system into the field of fire fighting training for fire rescue team in hazardous chemical warehouse, and develops a prototype of dangerous chemical rescue command simulation training system framework.
The variation characteristics of soil temperature in the compound soil
Authors: Guo Zhen , Lu Yangjie , Wang Jian 
Published: June 2020

Abstract
Temperature change is an important aspect of global climate change. By studying the earth temperature at different depths of the composite soil, the vertical belt distribution of the earth temperature is explored, which provides a preliminary theoretical basis for production practice. The temperature of the loess and sand treated 1: 1 is smaller, and the buffer effect on temperature is obvious, and the temperature is higher under this treatment. It can be seen that as the soil layer increases, the buffer effect of the soil on temperature changes. With the increase of soil layer, the treatments with better buffer effect and higher temperature were respectively: soft sandstone and sand 1:2 (5cm), soft sandstone and sand 1:5 (10cm), and loess and sand 1:1 (15cm).
Application of Big Data in Land Engineering
Authors: Ya Hu 
Published: June 2020

Abstract
Big data has been widely used in more and more fields due to its characteristics of many types, large amount of data and fast transmission speed. However, the application of big data in land engineering is just emerging. Induction and analysis of related documents and reports, list of big data in the reclamation of cultivated land management, project planning and schedule control decisions, and the land engineering the conditions needed for the development of the big data are discussed in this paper, in order to promote big data technology application in the land engineering, eventually to promote land engineering data value, promote the land management to further improve the quality.
Lane Line Edge Detection Based on Improved Adaptive Canny Algorithm
Authors: Zhang Xiao , Chen Fuen 
Published: June 2020

Abstract
With the development of autonomous driving technology, effective access to information on lane lines is of great significance for the decision-making of unmanned vehicles. The Canny operator is widely used in identifying the edge of the lane line, but the adaptive ability and anti-interference ability of the traditional Canny operator are flawed. In this paper, the lane line edge detection algorithm of the adaptive Canny algorithm is improved, and the adaptive median filtering and morphological closing operation are used to prevent the edge information from weakening while using multiple directions to calculate gradient magnitude. Finally, iterative method is used to improve the OSTU adaptive algorithm to determine its high and low thresholds. The test results show that the improved algorithm can effectively improve the accuracy, speed and anti-interference ability of the detection.
Automatic facial expression recognition based on MobileNetV2 in Real-time
Authors: Hu Lida , Ge Qi 
Published: June 2020

Abstract
Facial expression recognition (FER) plays a vital role in human computer interaction and has become important filed of choice for researchers in computer vision and artificial intelligence over the last two decades. As we know, the background or non-face areas of image will seriously affect the accuracy of expression recognition. In the era of mobile networks, the demand for lightweight networks and real-time is growing. However, many expression recognition networks cannot meet the real-time requirements due to excessive parameters and calculations. In order to solve this problems, our proposed methodology combines a supervised transfer learning strategy and a joint supervision method with island loss, which is crucial for facial tasks. In addition, newly proposed Convolutional Neural Network (CNN) model, MobileNetv2, which has both accuracy and speed, is deployed in a real-time framework that enables fast and accurate real-time output. As a result, superior performance to other state-of-the-art methods is achieved in facial expression databases CK+, JAFFE and FER2013.
Evaluation of Environmental Efficiency in Beijing-Tianjin-Hebei Region Based on DEA
Authors: Yu Ying 
Published: June 2020

Abstract
Data Envelopment Analysis (DEA) is a new category explored in operations research, management, applied mathematics, and finance. Beijing-Tianjin-Hebei coordinated development has become the focus of current national society. In this paper, a total of 13 cities above the prefecture level in Beijing-Tianjin-Hebei region are selected as sample units for decision-making. The total population at the end of the year, regional fixed asset investment, industrial dust emissions, industrial wastewater emissions, and industrial sulfur dioxide emissions were selected as input indicators. The actual GDP is used as the output indicator. Two linear programming models included in the DEA method are adopted: Model and The model, through the collection, screening and use of a large amount of data, uses Matlab programming to calculate the comprehensive technical efficiency, pure technical efficiency and scale efficiency of 13 cities, and evaluates and analyzes the effectiveness of the three efficiency values to correctly judge Beijing and Tianjin.
Research on the Influence of Modularization on the Performance of Old Building Area Improvement Project: A Longitudinal Analysis Based on Tianjin Data
Authors: He Weiyi , Wang Jianyu 
Published: June 2020

Abstract
In recent years, various areas have carried out different degrees of old building upgrading projects. However, due to the huge number of renovation projects in old building areas, the renovation needs of each building area vary, and the project objectives are characterized by scale supply, demand customization, strong timeliness, and limited investment. This poses a challenge for the government to improve the performance of such projects. How to respond quickly to the personalized needs of the masses while taking into account the efficiency of supply has become the primary problem to be solved by the government to ensure the project performance. On this basis, this paper takes Tianjin large-scale Old building area function promote renovation project as the research object, explore modularity theory in the process of such projects running “to do” and “how” problem, to explore the function module and structure module in the process of renovation project longitudinal launching state changes, as well as the comprehensive interface module standardization activities.
Study on the outdoor scientific physical exercise of the masses in Gansu plateau from the Environmental Science
Authors: Gao Jike 
Published: June 2020

Abstract
Based on the perspective of environmental safety, this study uses literature, instrument measurement and data statistics to study the physical exercise of the masses in the Gansu Plateau. It points out the environmental characteristics of the Gansu Plateau and the impact of the plateau environment on human health. Environment construction strategy. According to the WHO, outdoor environmental air pollution in urban and rural areas caused 4.2 million premature deaths in 2016 due to exposure to particulate matter (PM2.5) with a diameter of 2.5μm or less, which can cause cardiovascular and respiratory diseases and cancer. The World Cancer Organization’s International Cancer Research Institute conducted an assessment in 2013 and found that outdoor air pollution has a carcinogenic effect on humans. The particulate matter composition of air pollution is closely related to the increase in the incidence of cancer, especially lung cancer. [1] A study by Kunai et al, Points out that outdoor air pollution causes approximately 800,000 deaths worldwide each year, and the total healthy life expectancy of the world population is reduced by approximately 4.6 million years. Among them, twice as many people die each year as a result of traffic accidents. [2] Environmental pollution has severely affected our work and life, especially the haze weather in recent years has seriously harmed our physical and mental health.
Transmission spectrum simulation of long period fiber grating
Authors: Miao Songcen , Hu Xingliu 
Published: June 2020

Abstract
According to the three-layer structure model of fiber and the theory of fiber coupling mode, the mode coupling characteristics of LPFG are deduced and simulated by MATLAB. The LPFG transmission spectrum obtained by simulation is basically consistent with the existing experimental results. In addition, by changing the input parameters, the transmission spectra of different LPFG can be simulated, which is of great value for theoretical research and parameter design in practical application of LPFG.
Configuration Design and Analysis of Double Tetrahedron Superposition Symmetrical Coupling Mechanism
Authors: Zhang Shouli 
Published: June 2020

Abstract
A new hexahedral single degree of freedom developable symmetrical coupling mechanism is proposed based on the he spatial structure characteristics of regular tetrahedron. Firstly, in order to design the equivalent basic model of hexahedral mechanism, three kinds of substitute components are designed which based on the analysis of the spatial structure characteristics of the new hexahedron. The basic movable element is obtained by adding branched chains to change the constraints. A hexahedron coupling mechanism is designed by combining and reconstructing the elements. Secondly, based on the screw theory, the independent motion shunt labeling method is applied to calculate the degree of freedom and motion properties. Finally, the three-dimensional model of the coupled mechanism is established, and the displacement variations of the end and nodes under different driving conditions are simulated and revealed with time-displacement curves by Adams. Simulation results show that the novel mechanism is a symmetrical deployable coupled mechanism with one translation DOF.
Cooperative Walking Equipment for the Elderly
Authors: Zhao Tianhao 
Published: June 2020

Abstract
With the accelerated aging of our country and the increasing proportion of the elderly population, the health problems and quality of life of the elderly population in our country are receiving more and more attention from the society. Due to the aging of physiological function, the old people’s exercise ability is getting weaker and weaker, and the deterioration of exercise function causes various kinds of exercise difficulties, thus making the old people have different degrees of assistance needs in standing, walking and balancing. Based on this, we plan to design a walking aid device to maintain the walking function of the elderly. The device meets the walking requirements of the elderly through the coordination and cooperation of a multi-rod mechanism, a damping mechanism and a slider mechanism. Mainly to reduce the weight of the knee joint of the elderly, while assisting in regular exercise, exercise stimulates physiological activity and reduces physical decline. The device assists the elderly to walk and has three main functions of reducing joint load, increasing balance ability and assisting walking.
Determination of Gallic acid, Epicatechin and Epicatechin gallate in Different Varieties, Manufacturers and Grades of Tea by HPLC-DAD
Authors: Kong Juan , Zhang Lingling , Feng Hua , Yang Xiaosong , Huang Xulong , Wang Xiangpei , Wu Hongmei 
Published: June 2020

Abstract
Tea has been recognized by scientists for its health benefits and disease prevention. But there are many varieties of tea, and its quality is affected by many factors. The quality of tea determines its effects of health care and disease prevention, and gallic acid, epicatechin and epicatechin gallate are the main active ingredients in tea. The goal of this study was to detect the contents of gallic acid, epicatechin and epicatechin gallate in 33 batches of tea from the market by HPLC to explore the effects of these factors on the chemical composition of tea such as different varieties, different manufacturers and different grades. After the analysis of tea samples by HPLC, the relative standard deviations for precision, repeatability, stability and average recovery were acceptable, and the average recovery rates of gallic acid, epicatechin and epicatechin gallate were 100.2, 101.57 and 102.69, respectively. The results showed that gallic acid, epicatechin and epicatechin gallate were detected in both green tea and oolong tea, while epicatechin was not contained in black. The content of gallic acid and epicatechin gallate in green tea was higher than that in oolong and black tea. The composition content of some special grade tea was lower than that of first or second grade tea. Therefore, the results of this study provide a reference for people to choose high-quality tea and reasonable quality control of tea.
Study on UPLC Fingerprint of Alpinia officinarum Hance
Authors: Wu Hongmei , Yang Xiaosong , Kong Juan , Xu Feng , Wang Xiangpei , Huang Xulong 
Published: June 2020

Abstract
Objective: The UPLC fingerprint of Alpinia officinarum Hance was established to provide reference for evaluating the quality of Alpinia officinarum Hance on the market. Method: Agilent ZORBAX Eclipse Plus C18 (2.1 mm ×100 mm,1.8μm) chromatographic column, mobile phase 0.01% phosphoric acid solution (A) - acetonitrile (B), flow rate 0.1ml·min-1, detection wavelength 254 nm, column temperature 30°C. The fingerprints of 10 batches of Alpinia officinarum Hance were determined, and the similarity of fingerprints was compared by using the “similarity evaluation system of chromatographic fingerprints of traditional Chinese medicine” (2004 A). Results: The specific UPLC fingerprint of Alpinia officinarum Hance was established, 17 common peaks were established, and the similarity was between 0.922-0.989. Conclusion: The method is simple, efficient and reliable, which provides an effective and rapid evaluation method for the quality control of Alpinia officinarum Hance.
Studies on genetic diversity of Chinese mitten crab Eriocheir sinensis of Yangtze River system based on mitochondrial DNA control region
Authors: Wang Haihua , Feng Guangpeng , Zhang Yanping 
Published: June 2020

Abstract
We obtained mtDNA control region sequences of 102 E. sinensis individuals of 7 populations in Yangtze River system (Adults of E. sinensis in Huangmai, Poyang lake, Pengze, Anqing, Zhenjiang and the Yangtze estuary, juveniles of E. sinensis in Zhenjiang and the Yangtze estuary, abbreviated as HM, PY, PP, AQ, ZC, ZY and CY) and analysed their genetic diversity. The resulted showed that the complete sequences of control region was 515 bp. Total of 65 variation sites including 31 singleton polymorphic sites and 34 parsimony informative polymorphic sites were defined in the 102 individuals sampled of 7 populations, in which 60 haplotypes were detected. The haplotype diversity (Hd) was found to be 0.919±0.023, nucleotide diversity 0.01007±0.00081, the average nucleotide difference (K) 5.106. Genetic differentiation index (Fst) among populations was -0.0098 to 0.0983; genetic distance was 0.0067 to 0.0122; the genetic variation among populations accounts for only 3.3% of total variation. Mismatch distributions suggested that E. sinensis in the Yangtze River system had not experienced a rapid population expansion in the recent past. The results showed that genetic diversity level of E. sinensis in the Yangtze River system was high. The seven populations had not been formed geographic differentiation obviously and apomixes would occur between them.
A Nan composite for invisible dental device with highly transparent and antibacterial
Authors: Jin Hang , Shan Xiaoqian , Qin Yujie , Han Yu , Gao Ying 
Published: June 2020

Abstract
The thermoplastic polyurethane elastomer modified by nano-TiO2 particles was synthesized by in-situ polymerization, and the composite film is used for invisible dental device. The effects of different contents of nano-TiO2 on the transparency and mechanical properties of the composite film were investigated. The results show that the nano-TiO2 treated with silane coupling agent is uniformly dispersed in the TPU matrix. Compared with the pure TPU, the addition of nano-TiO2 makes the transparency decrease and mechanical properties improve significantly. The surface of the film was modified with dopamine and then connected with antimicrobial peptides. The results of antibacterial experiments show that the modified films have excellent antibacterial properties.
Study on the mechanism of breaking concrete by ultra-high pressure water jet
Authors: Xu Xinjian , Meng Zhaoxing 
Published: June 2020

Abstract
The concrete breaking mechanism of ultra-high pressure water jet is divided into two parts: the characteristics of ultra-high pressure water jet and the characteristics of concrete under the action of water jet. Through the analysis of the water wedge and water hammer under the action of the jet on the concrete breaking, ultra-high pressure water jet pressure and jet on the concrete strike force is a linear relationship.
Characteristics test of single point source wetting body of surge and spring root irrigation
Authors: Ye Shenglan , Liu Tiancheng 
Published: June 2020

Abstract
In order to further explore the change rule of soil wetting characteristics in surge and spring root irrigation, the single-point source flooding test of jujube micro-irrigation demonstration base in northern mountainous area was studied. Under different flow conditions, Soil wetting front migration distance and water distribution of the law, the results show that: wetting wet front movement quickly, with the passage of time and gradually slow down. The wetting radius of the horizontal flow increases with the increase of the drip flow. In the process of water redistribution, the wetting peak velocity of the small droplet shows a “failure” phenomenon, and the wet front migration rate larger drip flow significantly slows down. The general trend of soil moisture content of the single-point source moisturizing source is: the farther away from the straight line of the drip, the lower the water content of the soil; at the end of the irrigation, the soil water content decreases along the depth direction. As time goes on, the areas with high water content gradually migrate down from the surface layer, and finally the soil moisture distribution characteristics of low surface layer, high middle layer and low bottom layer are formed.
Multi-objective optimization design of passive filter based on particle swarm optimization
Authors: Wang Sibo , Ding Xuewen , Wang Jin 
Published: June 2020

Abstract
Using particle swarm optimization algorithm, aiming at the investment cost, filtering effect and reactive power compensation ability of passive filter, the weight of each objective function is determined according to the dispersion order method, and the passive filter is designed by multi-objective optimization. In addition, the actual calculation is carried out by taking the power grid parameters of the self-elevating and self-propelled petroleum engineering ship of “Feng Long 01” as an example. Further, a ship power grid simulation model is built under the Matlab/Simulink environment to verify the practicality of the optimized passive filter design.
Preparation and properties of Ag-based electrical contact composites containing Ag coated NbSe2/Ti0.09Nb0.91Se2 particles
Authors: Shi Qin , Zhu Hejun , Shi Yinhua 
Published: June 2020

Abstract
This paper reports the preparation and the study of mechanical, electrical and tribological properties of Ag-based electrical contact composites containing silver coated transition metal selenide. It is found that the hardness and strength of Ag-based electrical contact composites containing the transition metal selenide are improved, and the resistivity and the contact resistance are reduced. It is also found that Ag and Cr have good interfacial bonding strength by X-ray diffract meter. Through scanning electron microscope, we can find that the silver coated transition metal selenide is evenly distributed in Ag matrix and it has good interface bonding with Ag. Furthermore, the tribological test results show that the tribological properties of Ag coated the transition metal selenide is slightly affected, but it still shows excellent lubricity.