bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on the Ecological Environment Planning of Plant Garden Industry in Zhenjiang New District
Authors: Xiao Li
Published: June 2020

At present, the social ecological environment is fragile, and natural forestry environmental protection and artificial forestry environmental cultivation have become particularly important. This paper analyzes the development status of the ecological environment of the botanical garden industry in Zhenjiang New District, and proposes methods and recommendations for the ecological environment and forestry planning of the botanical garden. The purpose is to provide a basis for society to promote forestry ecological planning and construction and optimize the reuse of natural forestry ecological resources.
Experimental Study About Recovering Metal Lead By Direct Electrolysis Waste Lead Paste
Authors: Xiao Jiageng , Zhang Yusheng
Published: June 2020

The scraped lead paste is the major pollution In the Lead-acid battery industry, to solve this problem, how to dispose and utilize the waste lead paste is studied in this review study. Under acidic conditions, use the way of direct electrolysis to carry out Solid phase electrolysis of waste lead paste. The effects about three typical factors on electrolysis efficiency and energy consumption of electrolysis was studied, including the amount of lead paste, current density and sulfuric acid density. Through the design of orthogonal test to determine the optimum technological parameters. The technology has good economic value and environmental benefits, and it is easy to promote and apply.
Study on the Microstructural Features of the Soil Formed by the mixture of soft rock and sand
Authors: Yao Sisi
Published: June 2020

The scanning electron microscope was used to observe the microstructure of vermiculite soft rock, sand, and compound soil. Based on the observation results, the interaction relationship between vermiculite and sand particles was found during the formation of the compounded soil. The microscopic process reveals the sand-fixing mechanism of the composite soil, and quantitatively measures the sand-fixing effect of the composite soil. To provide a scientific reference at the micro-scale for improving the theory and technology of rapid mixing of soft rock and sand in the Mu Us Sandy Land.
Mineral Composition of Soft Rock in Mu Us Sandy Land, China
Authors: Peng Biao , Wei Yulu
Published: June 2020

Minerals are the main composition of soils. Soil minerals, especially secondary minerals, determine physical and chemical properties of soils. In this study, the X-ray diffraction ray experiments were carried out to study the mineral composition of eleven different color soft rocks and sands. The study found that the soft rock in Mu Us Sandy Land is mainly composed of quartz, potassium feldspar, plagioclase, calcite, montmorillonite, illite and kaolinite. The soft rock has various color types, such as yellow, grayish white, purple, grayish green. Different color soft rocks have different mineral composition. The grayish white soft rock has the lowest secondary mineral, accounting for only 5.4%; the light brown soft rock has the highest secondary mineral, up to 59%. The sands are composed of quartz, potassium feldspar, plagioclase, calcite, hornblende, montmorillonite, illite, of which the original mineral accounted for 93.5%, and the secondary mineral accounted for 6.5%.
Effect of light on soil microstructure and soil elements
Authors: Yang Chenxi , Li Juan , Shi Chendi , Zhang Haiou
Published: June 2020

light has certain energy, so it can change the soil microstructure and the elements in the soil when it radiates the soil. In this paper, the changes of total nitrogen and organic carbon in the soil under white light were studied. The results showed that: the light had an activation effect on the organic carbon in the soil; the light exposed the organic matter in the soil, accelerated the decomposition of organic matter, and reduced the total content of organic carbon. The results show that the infrared light has no effect on the soil structure, and the ultraviolet light can change the soil structure.
Effect of chemical modifiers on the growth of beet in saline soil
Authors: Lu Yangjie , Guo Zhen , Shi Chendi
Published: June 2020

The effects of different combinations of three modifiers on the growth of beet on saline soil were studied. The results showed that the combination of calcium sulfate and ammonium sulfate in the four improved combinations of saline soil promoted the growth of beet. SPAD was 120.85% higher than the control group, the chlorophyll content was more than double that of the control group. The photosynthesis was strong, which played an important role in improving the quality of beet.
Effects of Soil Organic construction on Regional Surface ET and GPP of Coal mine goaf
Authors: Gang Li , Nan Lu , Wang Na , Yang Wei
Published: June 2020

Based on the status of coal mine goaf restoration and the theory of organic land reorganization, we take the coal mine goaf in Yulin, northern Shaanxi as an example, and how does the development of organic soil reconstruction technology affect the surface ET and ecosystem GPP. Aiming at the problems such as soil pollution and ecological environment degradation in the mined-out area of coal mines, this study uses the integrated technology of land engineering and takes “process-mechanism-test-demonstration” as the main line to carry out targeted “differential remediation” and implement it accurately., System integration, research and development of soil organic reorganization and vegetation reconstruction technology systems in coal mine goafs, respectively, to promote cross-cutting research in areas such as land engineering, restoration ecology, ecological hydrology, etc. The research on the impact of the process on regional ET and GPP has scientific guidance significance for scientifically carrying out land reclamation in coal mined-out areas, regulating land use methods, mitigating and adapting to climate change, and improving the ecological environment.
Measurement and Evaluation of Energy-Saving and Emission-Reducing Efficiency in Beijing-Tianjin-Hebei Urban Agglomeration
Authors: Yuan Qingmin , Yin Shanshan
Published: June 2020

This paper used super-SBM model that considered undesired output, taking 13 cities in the Beijing-Tianjin-Hebei region as samples, and selecting panel data from 2008 to 2017 to measure the overall efficiency of energy-saving and emission-reducing in the Beijing-Tianjin-Hebei urban agglomeration. Decomposition and analysis of the comprehensive efficiency was performed through the Malmquist index model. The results showed that the overall efficiency of energy-saving and emission-reducing in the Beijing-Tianjin-Hebei urban agglomeration was generally low and fluctuating, showing the spatial pattern of the overall efficiency of energy-saving and emission-reducing has changed significantly, and the space radiation effect of high-efficiency cities was weak. TFPC fluctuated significantly, and TC was its main driving factor, PTEC and SEC jointly restricted the improvement of TEC.
Research on the Influencing Factors of China’s Resources and Environment to Urbanization Based on Computer
Authors: Wu Guanghua , Wu Peifeng
Published: June 2020

Based on the computer regression analysis method, this article first analyses the urbanization system, resource system, and environmental system on the premise of carefully analysing the connotation characteristics of new-type urbanization, resource and environmental carrying capacity, and response relationships. Mechanism of action. Furthermore, an index system for the response relationship of urbanization resources and environmental carrying capacity was constructed, and the urbanization level and resource and environmental carrying status of 10 provinces and cities in China were evaluated from 2000 to 2015. The characteristics of the change in the response relationship of each province and city are divided into three types: “positive response type”, “positive-negative response type” and “alternative response type”. Finally, through multiple regression analysis, explore the factors that affect the response relationship to show different evolutionary trends.
Research and Design of Writing Robot Based on Attitude Information
Authors: Yong Yan
Published: June 2020

With the development of artificial intelligence, autonomous learning writing robot has been a hot research topic. In this paper, the development of using cheap chip design suitable for low-end market need to write the low cost of robots, solve the traditional writing robot based on vision is higher requirements for image processing cost the problem. RBF neural network was optimized to learn and classify the pre-processed eigenvalues in the classifier, and its parallel broadcasting ability in Arduino 101 development board was used to make it learn, which improved the recognition rate and the performance of the writing robot.
Research on Unreasonable Parameter Identification Model of Overhead Line Based on k-means Clustering Algorithm
Authors: Zhang Yifei , Gong Yanfeng , Luo Jin
Published: June 2020

The existence of unreasonable in the planning of grid data may influence the economy and rationality of the power grid planning and so on, which may lead to unreasonable structure or potential risk in planning power grid. And it may even threaten the safe operation of the entire power system. This paper summarizes the general characteristics and methods of power grid planning, introduces the theory of data mining, and establishes an unreasonable parameter identification model for overhead transmission lines based on-means clustering algorithm. Finally, an example is given to illustrate the validity of the model and method.
Employment Analysis of University Students Majoring in Environmental Materials Based on Human Resources Information System
Authors: Li Yunyun , Li Ning , Jiang Miaoqing
Published: June 2020

In modern business activities, information has become one of the important resources. Whoever obtains the latest information and pays attention to the development and utilization of information resources may obtain huge economic benefits. The intensification of talent competition is both a challenge and an opportunity for colleges and universities. The human resources management department can no longer be the role of the policy executor in the traditional planned economy era, but should change into a policy advisor while understanding the superior policies. An analysis of the existing contingent of environmental materials professionals requires a powerful platform, namely, the human resources management information system. Human resource management department can no longer be the role of policy executor in the era of traditional planned economy, but should be transformed into policy proponent while understanding the superior policy. Based on the human resource information system, this paper attempts to analyze the employment of environmental materials majors in China from the perspective of human resource development, using the relevant theories of human resource development, and puts forward relevant suggestions.
Research on force characteristics of cap-pile system under earthquake action
Authors: Qin Fengyan , Yang Fulian , Ge Qingyun , Liu Hongbo
Published: June 2020

This paper presents a three-dimensional finite difference numerical analysis of cap-pile system under earthquake. The deformation law of the cap-pile system and the variation characteristics of the axial force and moment of the pile are obtained. Under the action of earthquake, the settlement of the cap is increasing, and finally did not retrace, while the axial force and bending moment of the pile, present the trend of increasing first and then reducing, and the withdrawal efforts are great. The force and displacement are not completely corresponding relationship under the action of the earthquake. The moment of the pile swings at 0 o’clock under earthquake.
Study on the destructive test of T-beam strengthened by external prestressing
Authors: Wu Junyan , Jiang Xiujuan , Wang Laiyong
Published: June 2020

Three T-beams with severe cracks in the operation were selected for the approach bridge of the Yellow River Bridge of a national highway. Three pieces of external T-beams were used for reinforcement and the destructive tests were carried out on the strengthened T-beams. The test results of the T-beam test of the approach bridge are analyzed to evaluate the bearing capacity. The main conclusions are as follows: The strengthened T-beam has greatly improved the mechanical performance, improved the cracking load of the T-beam, and slowed the crack development. The change of beam deflection is divided into three stages: 0~30t, 30~66t, 66~134t. The deflection value increases gradually, and the turning point of deflection changes basically corresponds to the crack development. The stiffness and ultimate load carrying capacity of the T-beam are greatly improved, which greatly improves the safety of the T-beam. Due to the lack of space at the bottom of the beam, the test beams of the three pieces of reinforcement were loaded to the final failure, and the maximum crack width has reached the loading termination condition. This indicates that the elastic stress stage of the T beam is increased after the reinforcement, and the T beam has a strong T-beam. Deformation recovery capability. It provides some reference for the reinforcement and transformation of similar T-beams and the evaluation of bearing capacity.
Research on Air Purification Wall Based on Heat Exchange Principle
Authors: Wang Libo , Peng Bowen , Cheng Tianyi , Shou Yejun , Shao Xinzhe
Published: June 2020

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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.
Vortex beam and its application in optical tweezers
Authors: Liu Chenliang
Published: June 2020

Vortex beams are beams with a spiral phase distribution and zero central light intensity. In recent years, it has been widely studied and applied. This article first analyses the characteristics of the vortex beam from a theoretical perspective, and then introduces the application of the vortex beam to optical tweezers.
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

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

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

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

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

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.
The quality supervision model construction of construction project in the whole life cycle
Authors: Wei Qi , Sun Lunan , Wei Li , Liu Qiannan
Published: June 2020

In order to find a solution to the shortcomings and problems in construction engineering supervision in China, the achievements of previous studies are summarized, and the construction engineering Life-Cycle is divided into pre-investment period, while-construction period, project operation period, as offers a theoretical basis for the quality supervision of construction project. In addition, by analysing the problems in current quality management with the principles of science norms vs standardized management, system management vs Life-Cycle, tradition inheritance vs reform and innovation, the basic framework of CELCQS model is constructed, and the duty subject of life-cycle quality supervision, the management subject of government supervision and the control subject of public supervision are pointed out. Among them, the duty subject includes the units of development, reconnaissance, design, construction, and project supervision; the subject of government supervision consists of the competent construction administration department and the national development and reform department and the construction drawing censorship; and the subject of social supervision refers to the project quality detection agency and the engineering cost consultation agency.
Study on the Fingerprint of Stellarlae Radix by UPLC
Authors: Yang Xiaosong , Kong Juan , Zhang Lingling , Wang Xiangpei , He Xiaomei , Wu Hongmei
Published: June 2020

Objective: The UPLC fingerprint of Stellarlae Radix was established to provide reference for quality control and evaluation of Stellarlae Radix. Method: The chromatographic separation was performed on a Agilent ZORBAX Eclipse Plus C18 (2.1mm×100mm, 1.8μm) with a gradient elution program using a mixture of acetonitrile and 0.1% phosphoric acid water as mobile phase at 225 nm wavelength, the flow rate was 0.1mL/min and the column temperature was 30°C. The Injection volume 1μL. 10 batches of Stellarlae Radix were measured under the same chromatographic conditions, and the similarity evaluation of 10 batches of Stellarlae Radix was carried out by using the software traditional Chinese medicine chromatographic fingerprint similarity evaluation system (version 2004). Results: The method for UPLC fingerprint analysis of 10 batches of Stellarlae Radix was established, and the similarity was between 0.941 and 0.980, and 13 common peaks were calibrated. Conclusion: The fingerprint method established in this study has good precision, repeatability, stability, short analysis time and strong specificity, which can provide scientific basis for the quality evaluation and control of Stellar Radix.
Exchange flow numerical method of dual-porosity model for different matrix size in 2D oil-water imbibition
Authors: Zheng Huan , Wang Min , Wang Xiaohong
Published: June 2020

Spontaneous imbibition is a common natural phenomenon in porous media. For natural fractured reservoir with a large number of hydrophilic and oleo-phobic rock blocks, the imbibition displacement of non-wetting phase by wetting phase with the dominant effect of capillary force is an important mechanism in exchange flow between matrix block and fracture in reservoir recovery. Scientists have concluded a scaling model which includes the permeability, porosity, boundary conditions, fluid-solid interaction and other factors though lots of experiments. In this study, after proposing appropriate characteristic scale in different periods of imbibition, the approximate saturation solution in one-dimensional imbibition obtained on the basis of scaling model is extended to two-dimensional process. Then, the exchange flow numerical method of dual-porosity model for two-dimensional multiphase imbibition is obtained. The results of simulation example show that the numerical method of exchange flow in this paper is more accurate than that of traditional dual-porosity model under different matrix rock size.
Research on Influence and Control of Unified Strength Theory of Geotechnical Materials on Deformation of Operating Metro Tunnels
Authors: Ling Pingping , Chen Zeshi
Published: June 2020

The difficulty in controlling large deformation of subway tunnels has always been a difficulty during construction and later operation, especially after the tunnel is excavated, a loose circle is formed around the tunnel. If the initial support strength of the tunnel cannot effectively resist the deformation of surrounding rocks, then Subway tunnels will continue to deform after excavation. If this kind of continuous deformation cannot be effectively controlled, the deformation of the tunnel will exceed the original designed deformation, and the large deformation of the tunnel will bring huge hidden dangers to the operation of the subway. The initial support technology is essential to quickly and effectively suppress the continuous deformation of the tunnel. Based on the unified strength theory, this paper studies the deformation mechanism and laws of the tunnel, and discusses several feasible control methods.
Sequence Analysis of BocAOP2.2 Gene in Cabbage
Authors: Yuan Qiao , Huang Wenli , Jian Yue , Zheng Hao , Jiang Min , Zhang Fen , Sun Bo
Published: June 2020

The AOP2.2 gene is an important gene affecting the side chain modification of aliphatic glucosinolate. Here, the Brassica oleracea var. capitata AOP2.2 (BocAOP2.2) gene sequence was obtained from the Brassica database (BRAD) and subjected to sequence analysis. It is indicated that the BocAOP2.2 gene contains a 1077 bp open reading frame (ORF) encoding a protein of 358 amino acids with a calculated molecular weight of 38.79 kD, the isoelectric point (pI) is 4.52. The highest number of amino acids is Valine (Val), whereas the lowest numbers of amino acids are Cysteine (Cys) and Tryptophan (Trp). Its prediction formula is C1664H2635N473O577S9. Its total hydrophobicity index is -0.549, the solution instability index is 23.25, and the fat solubility index is 78.41. Sequence alignment indicated that the BocAOP2.2 protein is more closely related to Brassica napus and Brassica Rapa, those all belonged to the Cruciferous genus. The results of this study provide a molecular basis for elucidating the function of BocAOP2.2 gene in cabbage.
Study on the microstructure and its coloration mechanism of peacock feather by the FDTD method
Authors: Wang Yongguo , Ren Yuehong , Wang Zhijun , Xu Qin , Zhang Lei
Published: June 2020

Animal body colors have attracted researcher’s attention because of their functions of reducing accessibility to predators, helping to capture prey, helping to court and so on. In the paper, peacock feather structure and mechanism of forming colors were relatively systematically studied. The experimental data of the microstructure of green male peacock “eyespot” parts were obtained, and their reflective optical characteristics were tested. The theoretical results simulated using a finite difference time domain method are well consistent with the above experimental results. Therefore, it was confirmed that peacock feather structural colors mainly come from two-dimensional photonic crystal structure. It further proves that the feasibility of the finite difference time domain method. This study is of great significance in printing and dyeing industry, textile industry and other fields in China.
Effect of Foreign Object Damage at Different Impact Parts for TC4 Titanium Alloy Blades
Authors: Zhu Guanfang , Zhang Zhongping
Published: June 2020

The effect of foreign object damage at different impact parts of TC4 Titanium Alloy blades is studied in this paper and impact damage from common foreign objects at different parts of the inlet side of the blade has been simulated in the process of aircraft skidding using the ANSYS/LS-DYNA software based on the Kinematic hardening plastic constitutive model. The results show that the damage depth of the sandstone increases linearly with the increase of relative kinetic energy when the same foreign object strikes different parts, but there is a critical relative kinetic energy of 2.54J and 2.50J for the steel ball and screw, respectively. When the relative kinetic energy is less than the critical value, the damage depth increases continuously with the relative kinetic energy, and when the relative kinetic energy is greater than the critical value, the damage depth decreases continuously with the relative kinetic energy.
The Influence of the Design and Manufacture of Sports Equipment on Sports
Authors: Qiu Zhenyu
Published: June 2020

Sports equipment is the general term of all kinds of equipment, apparatus and supplies used by people to participate in sports. It is an important carrier for people to participate in sports. Nowadays, the influence of sports is gradually expanding day by day. With the progress of science and technology, the important role of sports equipment has been highlighted in sports. The producers of sports equipment carry out innovation and creation, according to each link of sports, which not only promotes the development of sports, but also provides convenience for all levels of sports crowd. The design and manufacture of sports equipment is closelyrelated to the function of sports events, and also closely related to the use of sports participants. From the user’s point of view, this paper discusses the classification, design and improvement of sports equipment, and also discusses the application of sports equipment in sports competitions to avoid the occurrence of unfair factors, so as to maintain the fairness of sports competitions.
Study on the Balance Activity of Mice Based on BP-ANN
Authors: Zhu Lilan , Du Shaohui , Liang Xiaoli
Published: June 2020

In order to study the quantitative structure-activity relationship (QSAR) of the balance activity (pH) for 30 benzodiazepinooxazole derivatives to male mice, the molecular electronegativity distance vector (M
D) of above compounds was calculated by program according to molecular topological environment in this paper. The five-variable (M
6,
M
46, M
25,
M
63,
M
70) QSAR model of pH for above compounds was constructed by using leaps-and-bounds regression method. The result demonstrates that the model is robustness and good prediction ability by using R
cv

2, F tests. The M
6,
M
46, M
25,
M
63 and M
70 were used as the input neurons of artificial neural network (ANN), and a 5:3:1 network architecture was employed. A satisfying BP-pH model could be constructed with the back-propagation algorithm, with the correlation coefficient (R
2) and the standard error(S
D) being 0.928 and 0.117, respectively, showing that the relationship between pH and these structural parameters has a good nonlinear correlation. Form the three parameters of the model, it is known that the dominant influence factors of increased balance activity are the microscopic fragments: –CH3, –CH2–, >C<, –NH–, –N< and –X in the molecules.