bluuebunny/crossref_metadata_2025 huggingface dataset:
Analysis of the supporting head fracture of a lifting mechanism
Authors: Xing-chao WU , Jie Zhang
Published: December 2019

This paper introduces the working principle of a lifting mechanism and analyzes the end factors of the fault using the fault tree analysis method [1]. This paper also conducts strength analysis and physical and chemical analysis of the fractured supporting head, and determines that the cracks generated on the component surface due to the defect is the main cause of the supporting head fracture. Based on this, this paper proposes relevant solutions to improve the safety of the lifting mechanism.
Operating flow of live operation of transmission line with series of special tools
Authors: Jun Ma , Yonggang Shi , Liang Yu , Gang Dong , Fuxing Gong , Kegang Wei , Xin Su , Shoutong An
Published: December 2019

In view of the current characteristics of live operation of transmission lines and the problems of the use of series of special appliances without stipulations, etc. In this paper, the operation flow of live operation of transmission line using a series of special tools is presented.This article elaborates the operation process from seven aspects: scope of application, operation method, labor combination, operation process, safety measures, dangerous points, control measures and necessary tools.It solves a series of problems in carrying out live operation of transmission lines with a series of special tools.
Design and Research of Home Automatic Kitchen Waste Composting device
Authors: Na Wang , Gang Li , Hongming Zhang
Published: December 2019

As a part of kitchen waste, vegetable peelings has some special features such as high water rate,highorganic matter content and good biodegradability. By biological composting, such waste can be recycled, reduced, and become harmless. Based on analyzing the experimental results for the composting and fermentation of peel and vegetable leaves, an automatic composting apparatus applying for household was designed and researched. The function such as crushing pre-treatment, material transfer, fermentation and separation were realized by using the function components such as wringer blade and cross blade broken baffle,ect. The odor problem during fermentation was solved by activated carbon adsorption. Finally, solid fertilizer and fermentation broth with decontamination function were obtained.
Analysis of runoff characteristics and contribution rate in Xiying River Basin in the Eastern Qilian Mountains
Authors: Feng Lei , Yang Dong , Huang Yueyue
Published: December 2019

The impact of climate change on the basin is extensive and long-lasting, which will have a profound impact on the natural ecosystems, water resources, agriculture, and human production and life throughout the basin. An in-depth understanding of the impacts of climate change on watersheds and quantitative assessments will help to scientifically plan and manage water resources and protect the integrity of natural ecosystems. In this paper, temperature, precipitation and potential evapotranspiration data were used to analyze the response of Xiying River runoff to climatic factors in the Qilian Mountains by sliding correlation and wavelet analysis. M-K test and cumulative anomaly (CA) were used to analyze the climatic factors and runoff in the basin and use the pettitt method to test. Finally, the cumulative rate slope change rate comparison method was used to analyze the change of precipitation, potential evapotranspiration and snow-melt water contribution to runoff in this area. The results showed that temperature, precipitation and potential evapotranspiration had obvious mutations from 1961 to 2012 in this region. Compared with temperature and potential evapotranspiration, the precipitation showed greater impact on runoff. In addition, the contribution rate of ice and snow melt water to runoff was relatively larger in 1990 - 2002 compared to 1961-1989, followed by precipitation and evapotranspiration; the increase of the precipitation contribution rate became the main factor to runoff, followed by ice and snow melting and evapotranspiration compared to 1990-2002 in 2003-2017.
Research on Input-output Efficiency of Urban Industrial Land based on Super-SBM Model
Authors: Qian Quanhua , Lu Xu
Published: December 2019

The industrial land efficiency of 14 prefecture-level cities in Liaoning Province in China was measured and calculated by using three categories of input indicators (land, fixed asset, employed person) and output indicators (output value, profit, pollutant) and by using Super-SBM model. The results showed that the most of industrial land efficiency of every prefecture-level city in Liaoning Province was completely coordinated, the difference in their efficiency values was larger, the variable coefficient of their efficiency was large, and they had obvious two polarization; besides, they showed the decrease progressively from east to west on the spatial distribution and the trend of reducing from periphery to inner.
Analysis of Mechanical Parameters and Creep Characteristics of Surrounding Rock in Fully Weathered Sandstone Tunnel
Authors: Hua Kaicheng , Guo hongyan , Li Ke , Yang Cui Xiang
Published: December 2019

Based on the geological conditions of the fully weathered sandstone stratum in the expressway of the mountainous area, the Huizhou-Qingyuan section of the Yuzhan Expressway is used to analyze the mechanical parameters and creep characteristics of the surrounding rock of the tunnel through the indoor model test. It is concluded that: 1) The uniaxial compression deformation test measured the structural parameters of the fully weathered sandstone stratum structure, and obtained that the elastic modulus and internal friction angle φ of the fully weathered sandstone was 14.20°, and the cohesion c was 0.343Mpa. 2) The failure mode of fully weathered sandstone specimens was obtained by triaxial creep test. The creep curves of different weathered loads were analyzed and the Xiyuan rheological model was established. 3) The creep data was analyzed by MATLAB software, and the surrounding rock parameters under different surrounding rock were obtained.
Research on steel template design for supporting system of large cantilever special-shaped concrete structure
Authors: Zhou Yan , Cao Jian , Hu Linna , Hu Cheng
Published: December 2019

This paper analyzes the difficulties of steel template design. BIM information model was used for reference to set up a three-dimensional model. Structure safety, forming quality and construction convenience were fully considered. This paper takes Nanchang Chaoyang bridge as an example for the work of template design in each stage. By exploring the selection criteria of shaped structural steel template and establishing the corresponding calculation and design method, the implementation quality of the bridge tower was ensured. Research formed a template design system of template calculation and design. This system provided reference for other similar types of special structure template design.
The Integration Mechanism of Ancient Architecture Protection and Modern Construction
Authors: Yin Yirong
Published: December 2019

Being a carrier of history and culture, the ancient architecture is of great significance and worth protection in many aspects. However, in the process of modern urban construction, those buildings are facing the risk of being deserted and abandoned. At present, an important way to protect ancient architecture is to integrate them with modern construction. Taking Chengdu, Leshan and Xi'an City as examples, this paper attempts to solve the contradiction between ancient architecture and modern construction, proposing a feasible integration mechanism. According to the study, ancient architecture and modern construction have commonalities in culture and aesthetics, but have contradictions in economic and social aspects. Specific problems include lack of talent, inadequate supervision of capital flows, lack of security of cultural relics, and conflicts in urban style. This paper first clarifies the protection concept of ancient buildings, that is, to protect its cultural style and develop after protection. Secondly, this paper also proposes solutions to the problems found. Economically, the interest of architects and the level of supervision of restoration engineering funds need to be improved. In the social aspect, cultural relics can be ensured by improving policies and other means.
The Line-broken Analysis of the Aluminum Conductor Composite Core
Authors: Xue Chufan , Wang Dehong , Tang Yong , Chen Guorong , Lin Yongchang , Bai Junfeng , Ju Yanzhong
Published: December 2019

Aluminum conductor composite core has many technical advantages such as high tensile strength, light weight, low sag, large current carrying capacity. In order to study the influence of the broken of aluminum conductor composite core on the transmission tower, tower-line model was built by using the finite element software ANSYS/LS-DYNA, and the deformation of joints and stress of bar were analyzed. The impact load and the impact coefficient of the representative bars of the transmission tower are calculated. The results show that the impact acting on the tower is the most serious in the place of the conductor suspension point, the connection of upper and lower crank arms, the tower neck.
Analysis of Loading Stress of Pavement Structure using One-Step Forming Cement-Stabilized Macadam Base
Authors: Qin Yue , Meng Yongjun , Lu Zubiao , Zhao Qixiong , Rong Hongliu
Published: December 2019

Layered construction of large thickness cement-stabilized macadam base makes the base change from designed being forced by whole layer to being forced by two thin layers, the existence of interfacial friction between two thin layers reduces the pavement performance of the base, which finally cause the reduction of pavement performance of whole pavement structure. To analyze the load responses of large thickness cement-stabilized macadam base asphalt pavement under different working conditions, pavement surface deflection, maximum principal stresses of surface layer bottom and base layer bottom, minimum principal strain of soil base top and maximum shear stress of surface layer bottom under two different working conditions(layered construction and one-step forming) are taken as indexes and are obtained by finite element analysis method in this paper.
Preliminary Discussion on Monitoring of Steel Support Axis Force in Metro Engineering
Authors: Xu Yiteng , Xu Feng , Deng Peirong , Li Bin , Yu Zhifa , Li Lixin
Published: December 2019

Axial force monitoring of steel support is one of the important factors for foundation pit safety monitoring. In the monitoring of steel support, there are many problems, such as unreasonable installation of axonometer, irregular monitoring behavior of axonometer, incomplete analysis of axial force and imperfect early warning system. Collecting many engineering cases, and in-depth analysis and research on the problems and irregular behavior of steel support axial force monitoring in every link. The influencing factors and control measures of steel support axial force are discussed in detail, and some useful conclusions are obtained. It has been applied in the actual monitoring work and achieved good results. It is of great significance to guide subway safety construction and promote the development of axle force monitoring industry.
Suburbanization Effect of Urban outward Expansion in the New-type Urbanization and the Competitive Strategy of Assembled Building Developers
Authors: Luo Gangqiang , Wang Qin
Published: December 2019

This paper expounds the meaning of urban suburbanization in a narrow sense and broad sense, and probes into the dynamic mechanism of suburbanization. The influence of the suburbanization effect of the urban outward expansion on the assembled building developers is analysed from three aspects: the selection of the target market, the positioning of the market and the assembled building development structure. Based on the Salop Circumferential City Model, two stages of game analysis are carried out for the competition of assembled building developers. The research results show that in the process of suburbanization of most cities in China at present, it still stays at the stage of circular competition. With the continuous agglomeration of large population, industry and commerce in the suburbs of cities, the circular competition pattern of developers will be transformed into plate competition pattern.
Studies on Evaluation Index System for the Traffic Impact Evaluation Report Via the Triangular Fuzzy Number Hierarchical Method
Authors: XU H B
Published: December 2019

Traffic impact evaluation is quantitatively analysis aimed at new traffic demand after the construction project completed and put into use or the using change of urban land [1]. Traffic impact evaluation was first implemented locally in large cities of China, and then the relevant departments issued formal technical standards [2]. After 20 years of accumulation and development, almost all cities have formulated technical standards and management, implementation methods, lots of academic achievements and innovative experience were achieved. It has become an important basis of urban construction project planning, management and decision-making, also an important joint between technology and management [1]. Since 2010, the number of traffic impact evaluation projects has increased substantially. The implementation of projects and the standardization of projects report are the key factors for the sustainable development of the traffic impact evaluation market, and also affect the strategic deployment of urban transportation. In this paper, the triangular fuzzy number hierarchical method is used [3]. Based on the questionnaire data of specialist, the first level and second level index and respective weight distribution of evaluation index system for traffic impact evaluation report were obtained. The weight of index was adjusted through consistency judgment for assuring the rationality of index weigh. Evaluation index system was established based on the above mentioned studies, and the reference basis was provided for the evaluation of traffic impact evaluation report in the future.
Analysis of Factors Affecting Bearing Capacity of Large Diameter Single Piles of Offshore Wind Power under Earthquake Loads
Authors: Li Yazhou , Dong Li
Published: December 2019

The offshore wind turbine single pile foundation structure is simple and easy to install, but in the earthquake environment, large horizontal displacement is easy to occur, which affects the safe operation of offshore wind turbines. For this reason, the bearing characteristics and influencing factors of large-diameter single-pile offshore wind power under earthquake load are analyzed. The Mohr-Coulomb model is used as the model. The ABAQUS is used to construct the large-scale single-pile finite element model of offshore wind power. Loads and analysis of bearing characteristics and influencing factors of large-diameter single-pile offshore wind power under seismic loading. It is found that the increase of pile foundation depth will significantly reduce the horizontal displacement at the top of single pile. After increasing to a certain extent, it has no significant effect on the development of horizontal deformation of large diameter single pile; with the increase of pile diameter and wall thickness, The deformation of large diameter single pile foundation is reduced, but the influence of the pile foundation thickness on the horizontal deformation of the large diame-ter single pile foundation is no longer significant.
Research on the Calculation Method of Navigable Effective Width of Two Bridges Near Layout
Authors: Lei Liu , Fei-long Wang , Ning Zuo , Li-xin Lu
Published: December 2019

New-builtbridges andold bridges in inland waterwaysnear layout,the intersects angle that the normal direction of bridges axes andthe flow directionis more than 5, it is an important issuethat the navigable effective widthis determinedscientificallyand reasonably to ensure the safety of ships and bridge.In this paper, navigable effective clearance widthof two bridges as a wholeare calculated based on channel conditions and pier layout,which calculate the navigable effective width in the channel direction by oblique projection, determine the turbulence width by physical model test, graphicsand compare. Finally, taking the Lijiatuo Yangtze River secondbridge project in Chongqing as an example, the scientific and rationality of this method is verified, which can provide reference for the determination of navigable effective clearance widthof similar bridges in the future.
The path selection model of emergency logistics based on cumulative prospect theory
Authors: Wang Yihua , Yang Mengke , Zhou Xiaoguang
Published: December 2019

In recent years, sudden natural disasters occur frequently. Typical emergencies have the characteristics of great uncertainty, large-scale casualty risk, time pressure and urgency, which have a series of serious and sustained impacts on people's production and life. Therefore, after the emergencies, emergency rescue is particularly important for disaster-stricken areas, and the decision-making of emergency logistics is an important part of it. At present, the research on emergency logistics in China focuses on the shortest distribution time, multi-objective decision-making, dynamic path planning, and operational research. It is believed that people are completely rational in making decisions, ignoring people's subjective factors and risk attitudes. From the perspective of decision-makers' risk attitude, this paper studies people's decision-making bias under the condition of incomplete rationality.

Based on previous studies, this paper determines the value coefficient and weight coefficient, and according to the characteristics of emergency logistics, time is selected as the reference point., and A path selection model based on cumulative prospect theory is established. According to the risk attitude, the decision maker is divided into risk preference type and risk avoidance type. Based on the established model, an example is simulated, and the parameters in the model are simulated, and the impact of risk attitude and parameter changes on the final decision-making is analyzed. The simulation results show that the cumulative prospect theory is applicable to the study of emergency logistics decision-making mechanism, and the parameter setting will also have an important impact on the path prospect.
Study on the reliability of the carrying capacity of static pressure pipe piles in Shenyang
Authors: Lizhu Ma
Published: December 2019

On the basis of the previous work, combined with the test piles collected from Shenyang area, this paper makes a detailed study of the current standard single safety factor design pile base method to the probability limit state design pile base method. The main work is statistical analysis, calculation of reliability index, analysis of the main factors affecting the reliability index of static pressure pipe pile and the analysis of its sub-coefficient coefficients, the reliability of its carrying capacity analysis has made a useful exploration.
Research Progress on the Temperature Field of Steel-Concrete Composite Bridge
Authors: Liu Cheng , Fan Jiansheng , Xiong Lifa
Published: December 2019

The research of the temperature effect of steel-concrete composite bridges is of great significance to ensure the safety and durability. The latest research progress in the field of composite bridge temperature field is introduced, including the temperature field test of indoor and outdoor composite bridge, the fine finite element model of bridge temperature field and temperature distribution law of composite bridge. The study proposes two vertical temperature distribution modes of composite bridges under the action of sunlight, which can be used as reference for composite bridge design.
Real-time Dynamic Generation System for 3D Model of Arch Dam
Authors: Li Xiulin , Yang Guohua , Shan Qiang
Published: December 2019

For the characteristics of arch dam pouring process and the disadvantages of previous simulation tools, this paper proposes the idea of generating dam body in real time by 3D cutting method. With this method, only one 3D model of the dam body need to be established, then other 3D models can be generated based on the input data of the users, which can accurately and efficiently simulate the pouring process.
Research on Location Characteristics of Traditional Settlement of Ethnic Groups in the Hainan Island Based on GIS Technologies
Authors: Pan Ying , Cai MengFan , Shi Ying
Published: December 2019

Language is an important material carrier of national culture. Based on the language zoning of Hainan Island and combined with Google Earth, GIS technology and field research, the writer used overlay and statistics methods analyzed the key indicators of the traditional settlement such as altitude, slope, waterfront distance and landforms. The characteristics of the traditional settlement of the ethnic groups in Hainan Island are summarized as follows: 1. Compared with the Han nationality, the settlments of the Li and Miao ethnic minority are located on a higher altitudes and a larger slope. 2. Most of the settlements are located on the coast or the riverside. 3. The main landform of the ethnic groups differs from each other. It reveals that the basic characteristics of the traditional settlement in Hainan Island are based on the natural and multi-cultural environment, which provides a theoretical basis for the protection and development of traditional settlement and ecological civilization in Hainan Island.
Traffic marking recognition based on generating antagonistic neural network
Authors: Xu Shuwei , Zhang Shan , Xu Shuwei
Published: December 2019

This paper presents a method of extracting traffic lines from image images by GAN. Compared with the traditional image detection methods, the counter neural network does not need repeated sampling of Markov chain and adopts the method of backward propagation. Therefore, when detecting the image, GAN do not need to be updated with samples; it can produce better quality samples, express more clearly. Experimental results show that the method has strong generalization ability, fast recognition speed and high accuracy.
Elderly-oriented Reconstruction Plans of Outer Public Space in Small Town Communities
Authors: Zhao Yutong , Zeng Wanxu , Zhou Yuhong , Luo Rongyongzhong , Xu Zhihong , Tang Xiaohong
Published: December 2019

Along with accelerated “elderly-oriented” process, solving all kinds of social problems brought by elderly-oriented population has become our nation’s urgent task. At present, home-based care plays a significant role in old-age security model in China. Besides, the key step to promote harmonious development of society is to build a living environment suitable for the elders. In recent decades, we have built large numbers of residential communities. Environment quality of outer public space of some buildings is not suitable for elders to live. This thesis adopted some research methods such as document analysis, field research and questionnaire survey. The objects of thesis are residential communities built during 1910s to 1920s in Dujiangyan City. This thesis analysed the satisfaction and demands of elders for the communities’ outer space environment and communities’ public space environment. After considering elders’ characteristics and demands, this thesis put forward plans for elderly-oriented reconstruction of outer public space in small town communities from five aspects: community entrance and exit space, activity space, road system, lighting and marking system and public green, effectively optimized and improved the environment quality of outer public space of the communities.
Environmental Impact Assessment of Deep Pit Project in floodplain near Yangtze
Authors: Anyun Li , Yan Li , Shiyu Gao , Xiaopeng Zhao , Jian Wang , Xiangdong Song
Published: December 2019

The construction of deep pit has a great impact on the surrounding environment, which is mainly reflected in the subsidence of surrounding soil. Because of the particularity in geological and hydrogeological conditions of riverside floodplain area, environmental impact assessment is needed. According to the monitoring data of practical engineering, the deep pit in the floodplain area near Yangtze River may cause a large subsidence of the surrounding soil with a rapid subsidence rate and a wide range of subsidence effects. The subsidence of the surrounding soil increases with the depth and time of excavation, and the post-construction subsidence effect is not obvious. The environmental effects of the deep foundation pit project in this project have provided valuable experience for guiding the implementation of the deep foundation pit near the floodplain in the future.
A Study on Service Failure That Influence Repurchase Intention in Online Retailing: A Study among Online Shoppers in Klang Valley
Authors: Chee How Tan , Khang Yi Ho , Devi Rajendran Salini
Published: December 2019

Online retailing sector is a huge potential market with boundless prospect, so now, reducing service failures and increasing customers’ repurchase intention has become the first mission for every online retailer in order to increase their competitive advantages and market shares and to become the industry leader. The goals of this study is to identify the types of service failures that the online shoppers experiencing and which service failure is most critical toward repurchase intention of online shoppers. SPSS statistics analysis method has been used to analyze the data collected from the respondents. According to the result, it confirms that there are five types of service failures have significant relationship to the repurchase intention of online shippers. This study may likely to be a reference for related online retailer to examine their operation performance and customer loyalty in order to provide better services and boost up business in online retailing industry.
Evaluation of Hefei, Nanjing and Wuhan Tourism Competitiveness
Authors: Juan DU , Haitao WANG
Published: December 2019

Current study made a contrastive analysis of the tourism competitiveness of Hefei, Nanjing and Wuhan by using AHP method associated with establishing a tourism competitiveness index system. The differences of their tourism competitiveness and the decisive factors for that were discussed. The conclusions will be used as the scientific basis for future decision-making concerning the improvement of Hefei overall tourism competitiveness.
Time Scale Analysis of Precipitation Based on EMD Method in Xilin Gol
Authors: Suo Wenjing , Wu Guodong , Xue Heru
Published: December 2019

Xilin Gol is located in the north-central part of Inner Mongolia, and its western plains are extremely scarce areas of water resources.The analysis of the precipitation in Xilin Gol is of great significance to the economic development of local animal husbandry. Time series analysis and prediction have important practical application value, and scientific and accurate prediction results can provide a key guiding role for social activities. Combined with the fast Fourier transform, the empirical modal decomposition method was used to analyze the monthly precipitation data of Xilin Gol from 1961 to 2016.The results show that the time series has a period of 6 and about 22 months.And through the calculation of the contribution rate of the IMF variance, it is found that 12 months is the main cycle of the monthly precipitation of Xilin Gol,The results show that EMD can more accurately reflect the periodic characteristics of precipitation. The research results have certain practical value for the scientific and rational use of precipitation.
Comprehensive Utilization of Ammonia-containing Exhaust Gas in Soda Ash Chemical Plants
Authors: Yanping Dong , Lei Fu , Lihui Wang
Published: December 2019

Industrial chemical plants of soda ash mainly adopted the ammonia-soda production process and the combined process (Hou's process for soda manufacture), during which the mother liquor was recycled and the exhaust gas purified and recovered, realizing continuous manufacturing. However, in practical operation, there was still a small amount of fugitive ammonia emitted during storage and transport of materials. To improve the environment, an idea of using ammonia-containing exhaust gas for process improvement was introduced: collecting the ammonia-containing exhaust gas, extract some of the thin liquid from the circulating mother liquor for preparation of pure water, from which the concentrate return to the mother liquor circulation system and the pure water for absorption of the ammonia-containing gas; dilute ammonia water that took in the ammonia-containing gas and the feedstock ammonia were again used for preparation of ammonia water for industrial use, which, at the service of the boiler desulfurizing installations of the enterprise, helped achieve internal energy saving and emission reduction.
The use of mechanical ventilation systems with heat recovery to ensure air quality in residential premises
Authors: Navaseltsau Uladzimir , Navaseltsava Dzina , Khaletski Vitali
Published: December 2019

The construction industry is an important segment of the national economy of the Republic of Belarus. In recent years, strict environmental safety requirements have been imposed on the quality of housing being built. The carbon dioxide content in the classrooms’ air of the university as model objects was investigated by the authors. It has been shown that the content of this pollutant can exceed 2,000 ppm. The use of mechanical ventilation systems, especially with heat recovery, allows to solve the problem of poor air quality in residential premises. However, for the successful functioning of ventilation systems, systematic training of the inhabitants and the implementation of educational programs are required.
Ammonia migration from building materials to indoor air; technical, economical and environmental aspects
Authors: Krystsina Bondar , Natallia Yalavaya
Published: December 2019

The state-of-the-art of the problem of the migration of ammonia from building materials into the air of residential premises is discussed in the article. The international nature of the problem of ammonia pollution of indoor air in residential and office buildings was shown in the literature review. A method for the photometric determination of the content of nitrogen-containing compounds in the form of ammonium nitrogen with Nessler's reagent in concrete was propesd by the authors. This technique allows to control the ammonia content at a safe level. Also the method of potentiometric determination of the content of nitrogen-containing compounds for the analysis of additives for concrete was implemented by the authors. This analysis method allows prevent the use of additives that can potentially serve as a source of ammonia emissions during the exploitation of building materials.
Inversion Research on Aerodynamic Roughness of Different Underlying Surfaces in Aral Sea Basin
Authors: Qin Li , Yue Huang , Guoqing Sang , Anming Bao
Published: December 2019

The study of water and heat flux in Aral Sea Basin is a hot topic in the study of water resources in Central Asia. Aerodynamic roughness is the key parameter of inversion. Zom is retrieved based on NDVI and Albedo simulation and verified by the vegetation height in Central Asia. The results show that the inversion of Zom by this model is basically reasonable. In 2018, the monthly average value of Zom is about 0.056m, the vegetation height in Aral Sea Basin is about 0.44m, and both Zom and vegetation height in space are higher in eastern mountainous areas than in western desert areas.
In vitro antibacterial activity of 34 plant essential oils against Alternaria alternata
Authors: Lu Qiyu , Liu Ji , Tu Caihong , Li Juan , Lei Chunlong , Guo Qiliang , Zhang Zhengzhou , Qin Wen
Published: December 2019

To determine the antibacterial effect of 34 plant essential oils on Alternaria alternata, 34 plant essential oils such as asarum essential oil, garlic essential oil, and mustard essential oil are used as inhibition agents to isolate A. alternata from citrus as indicator bacteria, through the bacteriostasis test and drug susceptibility test, the types of essential oils with the best inhibitory effect were screened and their concentration was determined. The results showed that the best inhibition effect was mustard essential oil with a minimum inhibitory concentration of 250 μl/L and a minimum bactericidal concentration of 250 μl/L. Followed by the Litsea cubeba essential oil and basil oil, the minimum inhibitory concentration is 500 μl/L.
Gradually increasing Petroleum content in Jiaozhou Bay waters
Authors: Yang Dongfang , Li Haixia , Lin Dong , Zhang Yuan , Jing Dongmei
Published: December 2019

Based on the survey data of Jiaozhou Bay in May, August and October 1992, this paper studied PHC content in Jiaozhou Bay and its horizontal distribution in the surface layer. The results showed that PHC content in the waterbodyof Jiaozhou Bay in May, August and October ranged from 0.006mg/L to 0.075mg/L, which met the first-class, secondand thirdseawater quality standard in China. This fact indicatedthat the waters of Jiaozhou Bay were slightly polluted by PHCduring this period. In May, PHC content in the waterbody of Jiaozhou Bay ranged from 0.006mg/L to 0.070mg/L, showingthat itwasslightly polluted by PHC.The PHC content in the coastalwater at the entrance of Haibo River was 0.070mg/L, beingslightly polluted; The PHCcontent in the other waters of Jiaozhou Bay ranged from 0.006mg/L to 0.042mg/L, not polluted. In August, PHC content in the waterbody of Jiaozhou Bay ranged from 0.019mg/L to 0.056mg/L, slightly polluted by PHC. The PHC content in the central water of theeastern bay was 0.056mg/L, slightly polluted; The PHC content in the other waters of Jiaozhou Bay ranged from 0.019mg/L to 0.048mg/L, not polluted. In October, PHC content in the waterbody of Jiaozhou Bay ranged from 0.028mg/L to 0.075mg/L, showing that it wasslightly polluted by PHC. The PHC content in the coastalwaters at the entrance of Loushan River and Licun River ranged from 0.055mg/L to 0.075mg/L,slightly polluted; The other waters inside Jiaozhou Bay were not polluted. The PHC content in the water at the bay mouthof Jiaozhou Bay was 0.054mg/L, slightly polluted. There were three main sources of PHC in the waters of Jiaozhou Bay, namely oil spill transportation at sea, open sea current transportation and river flow transportation. The PHC content transported through oil spill ranged from 0.042mg/L to 0.056mg/L, that transported through open sea current was 0.054 mg/L, and that transported through river flow ranged from 0.046mg/L to 0.075mg/L. Among them, the PHC content transported through river flow from Loushan River was 0.075mg/L, that from Haibo River was 0.070mg/L, andthat from Dagu River was 0.046mg/L. The PHC content transported through oil spills at sea, open sea currents and river flows caused slight pollution. Therefore, from May to August and then to October, the continuous transportation of much PHC content into the waters of Jiaozhou Bay kept elevating the low level of PHC contentin the waters of Jiaozhou Bay.
Application of permeable reactive barrier in groundwater remediation
Authors: He Qianfeng , Si Shihui , Yang Jun , Tu Xiaoyu
Published: December 2019

As a new in-situ remediation of groundwater, compared with the traditional “pump and treat” technology, the permeable reactive barrier (PRB) has the advantages of low cost, no external power, the small disturbance to groundwater, small secondary pollution and long-term operation, this paper introduces the basic concept of PRB, technical principle, structure type, the principle of active materials selection and mechanisms of remediation, design and installation factors, it provides ideas for further research and application of PRB technology in groundwater remediation projects in China.
Highly active catalysts of iron-based materials with Au nanoparticles for soot oxidation
Authors: Wei Chao , Chen Zhenzhen , Hu Chao , Wang Haitao
Published: December 2019

Gold nanoparticles supported on transition metal oxide catalysts have been prepared by deposition-precipitation. Their catalytic activity with or without Au doped has been tested for soot oxidation. Au improves the catalytic activity of transition metal oxide for the oxidation of soot particles. Under the catalysis of Au/Co3O4, the initial oxidation temperature of soot is 354 ℃.
Effects of hyperaccumulator plant straw on antioxidant enzyme activities and osmotic substances and malondialdehyde content of lettuce under cadmium stress
Authors: Sun Guochao , Xu Xiangting , Xiao Yunying , Wei Xiaohan , Wang Yan , Tang Yi
Published: December 2019

Lettuce (Lactuca sativa) is one of the most common green leafy vegetables, which is widely cultivated all over the world, but extremely sensitive to cadmium (Cd) contaminated in soil. The effects of three hyperaccumulator plants straw (Solanum nigrum, Bidens pilosa and Galinsoga parviflora) on the antioxidant enzyme activities and osmotic regulators and malondialdehyde (MDA) content under Cd stress were studied by pot culture. Compared with no straw, three kinds of hyperaccumulator straw of S. nigrum straw, B. pilosa straw and G. parviflora straw increased the content of soluble protein and proline in lettuce, the activity of peroxidase (POD) and catalase (CAT) in lettuce was also increased, and the content of MDA was decreased. The stress resistance of lettuce was improved and the toxicity of Cd to lettuce was alleviated by using three kinds of hyperaccumulator plant straw.
Effects of hyperaccumulator plant straw on biomass and cadmium accumulation of lettuce
Authors: Liang Le , Zhang Ran , Zhao Yan , Zhu Ying , Ao Qiaoman , Tang Yi
Published: December 2019

To study the effects of hyper-accumulator plant straw on the biomass and cadmium (Cd) accumulation of lettuce (Lactuca sativa), the pot experiments were conducted to study the effects of straw application of three hyper-accumulator plants (Solanum nigrum, Bidens pilosa and Galinsoga parviflora) on the biomass and Cd accumulation of lettuce under Cd stress. The results show that: compared with no straw application, the biomass of lettuce was increased after applying three kinds of hyper-accumulator plant straw: S. nigrum, B. pilosa and G. parviflora, Cd content in the above ground part of lettuce was increased by 4.46%, 1.20% and 0.63% respectively, compared with that of non-application, and Cd content in the root of lettuce was decreased. The application of three kinds of hyperaccumulator plant straw promoted the growth of lettuce and increased Cd uptake by lettuce of aerial part.
Effects of mutual intercropping of tomato on soil enzyme activity and available selenium under selenium stress
Authors: Yu Minghong , Hou Yuefeng , Bie Yuhui , Chen Xu , Dong Yiping , Tang Yi
Published: December 2019

In order to study the effect of mutual intercropping tomato on soil enzyme activity and available selenium content in selenium-containing soil, cherry tomatoes of red, yellow and purple varieties were selected for pairwise and three intercrops in this experiment respectively. The results showed that the activities of sucrase, phosphatase and urease in soil were increased after the three kinds of tomato were intercropped with each other, and the highest soil enzyme activity was found when red and purple tomatoes were mixed. Soil pH reached the maximum when three tomatoes were mixed. The content of available selenium in soil after intercropping tomato was higher than monoculture, and the content of available selenium was the highest when red and yellow tomatoes were mixed. Therefore, intercropping could improve the soil microecological environment, increase soil enzyme activity and increase available selenium content in tomato rhizosphere soil.
Study on distribution characteristics of chromium and nickel in root soils around a typical abandoned alunite mining area
Authors: Lin Zhu , Bingyu Chen
Published: December 2019

The exploitation of alunite resources results in the exposure of heavy metals to the surface surrounding, enrichment in soil and potential health risks to human beings. This study investigated the heavy metal pollution of root soils in a mining district surrounding a typical abandoned alunite mining area in Anhui province of China. Up to 10 root soil samples were collected in 20 sampling sites, and the concentration of Cr and Ni were determined. The results show that the root soils contained acceptable levels of Cr and Ni occurring in the ranges of 46.2-503.5 and 12.8-44 mg/kg, respectively. According to the National Soil Environment Quality Standards, few samples had Cr and Ni contents exceeding the risk screening values. However, due to the regional differences of background values, the geoaccumulation indices of Cr indicate slightly to extremely contaminated. Based on the calculation of potential ecological risk index, all the root samples were considered as low health risk level. These findings indicate the possible need for deeply and comprehensively investigation of heavy metals at alunite ore mines.
Study on the Changes of Plant Ecological Communities and Environmental Factors in Cold Cities
Authors: Li Shengju , Wang Xue , Zhang Yaosheng , Zhang Yuehua , Li Lan
Published: December 2019

There are certain geographical differences in the design process of green areas along the streets of the cold city. The cold climate brings special geographical features to the city. The snow and ice add new vitality and characteristics to the city, and at the same time public demand new challenges for the excavation and creation of cold garden resources. The definition of standards for cold cities and the contribution of cold cities are movements to cold cities. Green space next to the city streets are systematically defined, and the role and influence of public life generated by the concept of greenbelt are inspected. This paper analyzes the design principles and theoretical basis of the green space design along the street in the cold city. An example is given to analyze the problems and optimization suggestions that should be paid attention to during the design process of the green space next to the city. From the solution of the problematic elements in the greening landscape design along the cold city street, the methods and strategies of the greening landscape design along the cold city street are analyzed from the aspects of plant.
Effects of basicity and CaF2 on the viscosity of CaF2–CaO–SiO2 slag for electroslag remelting process
Authors: Lao Yigui , Gao Yunming , Deng Fangjie , Wang Qiang , Li Guangqiang
Published: December 2019

Effects of the basicity and the CaF2 content on viscosity of CaF2–CaO–SiO2 slag with high CaF2 content for electroslag remelting process were investigated by the rotating cylinder method in the temperature ranging from 1773 to 1533 K. The relationship between the structure and the viscosity variation of the slag was also clarified by the Fourier transform infrared (FT-IR) spectroscopy of water-quenched slags. The results show that the viscosity gradually decreases with the increase in the basicity of the slag from 1 to 3 under the present experimental conditions. It is found that the CaO does not depolymerize all silicate complex anions for the slag with the basicity of 1 at 1773 K and there are still some bridging oxygens. With the increase in the basicity to 3, the silicate complex anions are almost completely depolymerized to simple ions. As the CaF2 content increases from 40 to 80 mass%, the viscosity of the slag decreases due to the dilution of CaF2 for the concentration of the silicate complex anions in unit volume of the slag. Moreover, the effect of the temperature on the viscosity is not remarkable. The activation energy of viscous flow exhibits the decrease from 40.4 to 26.7 kJ · mol−1 with the increase in the basicity from 1 to 3, and also the decrease from 66.6 to 31.0 kJ · mol−1 with the increase in the CaF2 content from 40 to 80 mass%.
Accumulation during fruit development of components of interest in seed of Chia (Salvia hispanica L.) cultivar Oruro© released in France
Authors: Gravé Gwendoline , Mouloungui Zéphirin , Poujaud Frederic , Cerny Muriel , Pauthe Caroline , Koumba Ibinga Sidrine , Diakaridja Nikiema , Merah Othmane
Published: December 2019

This study aimed to examine the accumulation of oil, fatty acids, sterols and tocopherols contents and compositions during fruit development on the new cultivar of Chia Oruro (Panam Cie, France) cultivated in France. This cultivar is the first released genotype in Europe and for cultivation in Europe. The experiment was conducted in 2017, in south-western France at the Regional centre for organic agriculture, at Auch (near Toulouse, South-West of France). Four samplings were made at 17, 24, 27 and 35 days after flowering (DAF). These dates of sampling correspond to stages 7–8 (fruit development and maturity) of BBCH scale. Oil content, fatty acid composition and sterols and tocopherols contents and profiles were determined. The highest levels of oil and tocopherols were reached at 27 DAF. In contrast, phytosterols content was highest at 17 DAF (726.2 mg/100 g of oil) and decreased after this date. β-sitosterol was the main sterol in chia seed (63.4 to 89.1% of total sterols, depending of stage of fruit development). γ-tocopherol represented more than 92% of the total tocopherols present in the seed. High levels of polyunsaturated fatty acids (74.4 to 80% of total fatty acids) were observed in our study confirming those already reported in this species. High levels of saturated and monounsaturated fatty acids were reported at earlier stages and decreased gradually during fruit development. Polyunsaturated fatty acids followed an opposite trend. Their level was lowest at 17 DAF (74.4%) and increased gradually to reach their higher level at 35 DAF (80%). These results suggested clearly the interest to harvest and use of seed before entire maturity of the grain.
Physical Performance and Quality of Life after Ankle Fusion
Authors: Harrasser Norbert , Gebhardt Christine , Südkamp Norbert P. , Schmal Hagen , Walther Markus , Mehlhorn Alexander Thomas
Published: December 2019

Introduction Ankle fusion is still considered as an established therapy for end-stage ankle osteoarthritis. To determine exact description of postoperative functioning, it is necessary to consult a variety of functional scores and quality of life questionnaires.

Methods/Patients 34 patients with 34 ankle fusions were investigated on average 5.9 years postoperatively by functional tests and health-related quality of life questionnaires (AOFAS hindfoot score [AOFAS: American Orthopaedic Foot/Ankle Society], Foot Function Index [FFI], Lower Extremity Functional Scale [LEFS], Lower Extremity Activity Scale [LEAS], Visual Analogue Scale Foot/Ankle Surgery [VAS FA], Short Form 36 [SF-36], EuroQol 5D [EQ-5D]).

Results After ankle fusion: the majority of cases gain pain reduction, but residual symptoms may persist; the maximum walking distance (subjectively more than objectively) will be extended; rarely walking without any aids can be achieved; in most cases, the gait pattern is only slightly changed; the re-entry into working life is often possible; climbing stairs without any restrictions is not always possible; the psychological situation will be equalized with that of healthy people.

Conclusion The results of the study confirm the success rates of ankle fusions in the majority of cases. Well defined limitations and residual symptoms can be named on the basis of the available data.