bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on and Application of the Control of Manhole Cover in the Launching Silo Based on Machine Vision Technology
Authors: Yan Long , Jia Hai-jie , Ding Meng-lei , Hou Dong-dong , Jing Jun , Zhang Xiang
Published: September 2019

The manhole cover is an important for the launching device as a whole because its uncovering is vital to the whole switching process. The contact switch is now mainly used to judge whether the manhole cover is in place; however, in this way, the state of the manhole cover cannot be directly observed. In order to make improvement in this regard, this paper adopts machine vision technology to detect the state of the manhole cover and observe the switching process of the manhole cover and detect the in-position signal in real-time by setting a target at a specific position and identifying the target signal using digital image processing technology. Experiment shows that machine vision technology can quickly identify the target signal and directly observe the switching process of the manhole cover.
Combination-Focusing Model of Freak Wave Based on Boussinesq Equation
Authors: Yu Xiang-jun , Li Qing-hong , Wang Hua
Published: September 2019

Freak wave is a kind of instantaneous disastrous wave with large wave height, which has great destructive effect on the navigation of ships at sea. Based on the layered Boussinesq equation, a wave model for focusing simulation of freak wave is established, and the numerical generation of freak wave is realized. Through the calculation results, the evolution process and the non-linear characteristic parameters of the freak wave are analyzed and discussed. The following conclusions are drawn: The influence of different energy distribution modes on the simulation of the freak wave is analyzed. Focusing model of simulated freak wave based on layered Boussinesq equation can reproduce freak wave events on random wave field when energy input of freak wave train reaches 10%. The simulation efficiency is high, the influence on skewness is small, and the influence on kurtosis is large.
Robustness of maritime network along the Maritime Silk Road based on trajectory data
Authors: Xie Yanxin
Published: September 2019

Most of the current research on the robustness of the maritime network is based on container liners, ignoring the diversity of maritime trade. Based on the 2014 AIS trajectory data, this paper constructs the maritime network of three cargo ships of container, tanker and bulk along the MSR. The author uses two strategies of random attack and deliberate attack to analyze the changes of three networks under different attack strategies. The study finds: (1) The maritime network that is constructed based on the real cargo ship AIS trajectory more fully reflects the changes in the maritime trade route of the MSR. (2) The dry bulk maritime network is the most robust, the tanker maritime network is second, and the container maritime network is the most vulnerable. (3) In the deliberate attack, the container maritime network is extremely vulnerable, and the collapse domain of the tanker maritime network is short. Once the tanker network begins to collapse, it will quickly fail. The research results can provide decision-making basis for a comprehensive understanding of the MSR shipping trade, port investment planning, route optimization.
Remote sensing retrieval for Chlorophyll-a and Suspended Matter Concentration of Longyangxia Reservoir based on landsat OLI data
Authors: Zhu Wenzhe , Lei Haochuan
Published: September 2019

In this study, the Longyangxia Reservoir was taken as the research area and the chlorophyll-a and suspended matter concentration data of 20 measured sample points and the simultaneous landsat8 remote sensing image data were used. Firstly, remote sensing images were preprocessed, and then 15 sample data were randomly selected from 20 data points. Through correlation analysis of the 15 sample data and landsat OLI data, bands sensitive to chlorophyll-a and solid suspended matter concentration were found. Using the detected sensitive bands, an inversion model of the relevant concentrations of chlorophyll-a and solid suspended matter was constructed. Finally, the remaining 5 sample data are used to calculate the relevant precision index. By using the calculated determination coefficient, root mean square error and overall relative error, the precision of the inversion model is comprehensively evaluated, so as to find a universal model. Through the established inversion formula, ENVI/IDL and ArcGIS software were used to complete the mapping of chlorophyll-a and suspended matter concentration of Longyangxia Reservoir in 2013 and 2018, providing a reference for the comprehensive treatment of Longyangxia Reservoir.
Effect of sea surface temperature on sea surface brightness temperature measured by L-band microware radiometers
Authors: Li Yanyan , Dong Qing , Ren Yongzheng , Kong Fanping , Yin Zi
Published: September 2019

The effect of sea surface temperature (SST) on sea surface brightness temperature measured by L-band microware radiometers is estimated in this paper. We found systematic SST dependence in Aquarius radar backscatter σ0, radiometer excess emissivity Δe as well as sea surface excess brightness temperature ΔTb. The influences of SST on σ0, Δe and ΔTb in cold water are much more bigger than that in warm water. The precision of the corrected measured flat sea surface bright temperature is improved significantly after correcting with SST.
Research on Fast Extraction Method of Sea Ice Boundary in Arctic Channel Based on MODIS Data
Authors: Yang Yiman , Cheng Liwen , Tang Lulu , Dong Jian
Published: September 2019

In order to study the distribution of sea ice in the Arctic Channel, sea ice along the Arctic Channel was extracted based on MODIS remote sensing data. Supervised classification method is used to establish a noise removal method for short time series to obtain the sea ice distribution boundary. From this, the navigability of the Arctic waterway is analyzed. The results show that although MODIS data contain more noise effects, more accurate sea ice distribution information can be obtained by effective noise removal methods, which provides support for the judgment of navigation capacity of Arctic waterway.
Research on the renovation of Jiarong Tibetan traditional residential building based on the improvement of comfort and safety-- take JiaJu Tibetan village as an example
Authors: Sun Sijia , Ren Yaqiu , Li Yuchen , Zhou Yawen
Published: September 2019

Jiarong Tibetan houses are still not adapted to the Tibetan environment to a large extent, and some of the houses have fallen into disrepair and the living environment of Tibetan people is extremely poor. Most of the previous studies failed to put forward specific and targeted suggestions, so the improvement of Tibetan living environment could not be implemented. Based on the previous literature, this paper attempts to deeply analyse the significant problems of jiarong Tibetan traditional residential buildings, such as severe cold wind penetration, unreasonable functional layout, and poor seismic strength of building components, through the combination of theoretical analysis and experimental simulation, feasibility of high update scheme is put forward, aimed at the next Jiarong Tibetan folk architectural design to provide the reference.
Research on Spatial Distribution of Modern Commercial Buildings in Guangzhou Based on GIS
Authors: Wang ShaoBin , Liu QiongLin
Published: September 2019

Based on the translation of the historical maps of cities, this paper sorts out the distribution information of various commercial buildings in Guangzhou during 19th century, and establishes a database of commercial buildings in Guangzhou in the 19th century with spatial information technology to show the distribution of various commercial buildings in this city. Moreover, this paper uses GIS to process pairing and density comparison analysis from various sources, which reveal the evolution characteristics, and impetus factors, of commercial buildings in Guangzhou from the formation and factors of urban commercial buildings spatial pattern. Finally, this paper provides countermeasures for the protection of contemporary Guangzhou city, commercial and trade buildings, in the context of rapid urbanization.
From single leading construction to multi-information form —on the Multi-party Game in the urban renewal
Authors: An Na , Yang Shuhang
Published: September 2019

With the advent of inventory planning, China urban renewal gradually from one factor domination, changes to pay attention to multi-governing, public participation aspect. However, now most of urban renewal are faced with frequent conflicts between demolition and relocation, and the main parties escalation of the conflict. Urban renewal urgently needs coordinated development of multi-body. Therefore, this paper explores on the basis of the home and abroad public participation practice cases, summarized domestic and foreign synergic governance of multiplicity experience, from the current urban renewal problems, analysis of the trend of urban renewal under the synergic governance of multiplicity in the future. Finally, the strategy of the urban renewal planning mechanism based on the multi-party game is obtained.
Research and Application of Intelligent Power Supply of Huadu to Donguan Highway
Authors: Chen Chao , Lu Hui , He Qinghua , Yue Weijie , Lin Haiteng , Li Zhengkai , Wang Zhaoming
Published: September 2019

Under the background of rapid promotion of green highway construction, highway construction pursues efficiency, quality and engineering durability, environmental protection. Highway engineering construction has the phenomenon of high cost and large consumption of supporting power supply system. How to effectively control the power system is an urgent problem when facing highway construction units. Taking the expressway from Huadu to Dongguan as the research object, this paper studies and applies the smart power supply safety management and smart power supply system. This system can effectively deal with the problems of power supply and distribution supervision of Huadu to Dongguan expressway. It can improve the overall operation and management level. It is suitable for promotion and application in Guangdong province and the whole country.
Multi Axis Robot Coordinate Detection Method Based on LabVIEW
Authors: Zhang Guoxu , Yang Shifeng , Guo Zhongji , Peng Qingfeng
Published: September 2019

In view of the fact that the need of high precision and safe production of multi-axis robot, a real-time coordinate detection method is designed by using virtual instrument software structure VISA. Programmable multi-axes controller (PMAC) is used as the control system of the lower computer, LabVIEW as the upper computer, PMAC board communicates with the upper computer through industrial Ethernet, and sends command data and pulse signal to the servos through the bus. LabVIEW uses VISA software interface to communicate with the servo drivers, uses Modbus protocol to obtain absolute position data, and calculates the current coordinates of the workbench. Experiments show that the multi-axis robot coordinate detection method based on LabVIEW can realize the coordinate detection of the moving platform, and the following error current value can also be displayed in the working interface.
Effect of groove defect State on propagation of SH0 guided wave in flat steel of grounding network
Authors: Ke-long HE , Zhang Zhou-quan , Zhuan LIU , Hui ZHU , Peng Guo-da , Zhan TU
Published: September 2019

By studying the depth and length of groove defect, this paper explores its effect on the propagation of SH0 wave in the flat steel of substation grounding network. The results show that the sensitivity of SH0 wave to defect detection in the propagation process depends on the depth of defect, that is, the corrosion cross-sectional area. Reflection waves are difficult to detect when the defect cross-sectional area is less than 18.75%. The smaller the defect depth, the weaker the echo signal.
Research on energy saving of Coalbed Methane Field pumping wells based on Data Mining
Authors: Li Xueqin
Published: September 2019

Generally, the CBM well has the characteristics of large variation of the water rate and unstable pumping load, corresponding equipment type, status and parameters adjusted frequently, the utilization rate of energy is generally low, however, the energy transfer relationship of pumping unit system is complex and the coupling between parameters is strong, the theoretical calculation method requires high energy consumption calculation parameters for each node, and the effective dynamic analysis cannot be realized; the experience analysis method has high workload and high requirement for analysts. In southern Qinshui basin CBM Wells, for example, by analyzing the relationship between production parameters and the energy consumption of each node, a multi variable data mining algorithm is constructed for the energy consumption index of the common pumping unit system, according to the energy consumption data characteristics of pumping unit, the single well is classified, and the adjustment optimization strategy of pump replacement, pumping-unit replacement, intermittent pumping and equipment maintenance is put forward according to the different types of energy consumption bias. Verified by practice, the application of this technology can improve the timeliness and accuracy of energy consumption data analysis of CBM pumping well, effectively reduce the cost of energy consumption analysis on mechanical production Wells, and is helpful to improve the intelligent level of CBM gas field production.
A Review of Pipeline Transportation Technology of Carbon Dioxide
Authors: Wang Haixia , Chen Jusheng , Li Qingling
Published: September 2019

CO2from industrial production is captured and stored to be buried underground or used for driving oil or gas(CCS). The CCS technology can be used not only to mitigate environmental pollution and reduce the anthropogenic greenhouse effect, but to improve economic efficiency. CO2 transportation is imperative, and pipeline transportation is the most economical and convenient way for CO2 transportation because of its features such as large-throughput, long-distance and reliable-operation. According to the different phases, CO2 pipeline transportation can be divided into gas phase, liquid phase, dense phase and supercritical transportation. In this paper, the characteristics and application ranges of three kinds of pipeline transportation process were analyzed, finally in a design influence factors of pipeline transportation were analyzed, and faced currently of problems were shown.
Research on Optimal Layout Strategy of Electric Vehicle Charging Network by Considering Land Resource and Policy Constraints
Authors: Ding Ning , Yan Hui , Jiang Linru , Zhang Jian , Han Wenqi
Published: September 2019

With the increasing demand of people for transportation, the number of automobiles in cities continues to increase, which leads to haze weather, PM2.5 pollution and other environmental problems. In order to reduce fossil energy consumption and carbon emissions, the development of energy-saving and environmentally friendly transportation tools has become the focus of attention. In this paper, the electric vehicle industry has developed rapidly, the sales market has begun to take shape, and the Chinese government has given policy support such as purchase subsidies. However, the layout of charging network of regional electric vehicles represented by residential areas is not perfect, which leads to the low satisfaction of users’ charging demand, the insufficient utilization of resources and the high cost of charging station network. In this paper, a single objective non-linear programming model for minimizing the cost of investment, operation and maintenance of charging stations with resource and policy constraints is established. In the optimization of the model, combined with the advantages of particle swarm optimization and genetic algorithm, the hybrid algorithm of particle swarm optimization and genetic algorithm is selected to obtain the optimal solution of the model. Taking a residential area of 10.5 km2 as an example, the optimized charging station and its service scope are obtained, the location and capacity of charging station are determined, and the accuracy and validity of the model are verified.
A water level dynamics simulation model of AP1000’s steam generator based on Åström-Bell model
Authors: Huan Lei , Weide Huan
Published: September 2019

The steam generator (SG) is a crucial component of the AP1000 pressurized water reactor (PWR) nuclear power plant systems. The operational stability of SG must be considered for entire nuclear power system’s safety and availability. The presence of steam bubbles under the water level in the steam generator causes the shrink and swell phenomenon. It makes the water level control problem of SG complex. Therefore, a relatively simple lumped parameter model that agreed well with experimental data of SG was presented. First, a moderately complex fourth order nonlinear mathematical model of AP1000 U-type steam generator was established based on Åström-Bell model. Second, the simulation platform was built and then the simulation was conducted in MATLAB/Simulink environment. Finally, the model parameters were obtained from estimating from the standard AP1000 test data and the simulated results were compared with the standard test data. The results showed that the model could capture the dynamic fluctuation of water level in AP1000 SG over a wide operating range.
Research on effect of lightning shielding level of EHVDC transmission line by installing coupling ground wire
Authors: Zou Yanhui , Yue Yishi , Huang Fuyong , Wang Haiyue
Published: September 2019

Lightning shielding failure is the main reason causing lightning flashover of Jiangcheng EHVDC transmission line because of the designed ground wire protection angle. Based on the electric-geometry model, a simulation model including the coupling ground wire is established by using MATLAB. The effect of the coupling ground wire at different height and horizontal position on lightning shielding failure flashover rate is analysed. Results show that coupling ground wire can reduce the lightning shielding failure flashover rate and the lightning shielding performance increases with the increase of the height of the wire and the horizontal distance between the axis of the tower and the coupling ground wire.
Research on observation method of leader discharge thermal expansion based on quantitative schlieren technique
Authors: Yue Yishi , Zou Yanhui , Wang Haiyue , Huang Fuyong , Wang Cheng
Published: September 2019

Lightning is one of the main causes of UHV DC transmission lines trip-outs. To measure the leader discharge thermal expansion of leader could help us to have an in-depth understanding of the lightning protection. In this paper, a temperature measurement system based on calibration schlieren principle is developed in the first place. Combined with a high speed camera, the spatial resolution of this temperature measurement system is 100 μm/pixel. Secondly, the image process is discussed in this paper. Thirdly, the temperature distribution of an alcohol lamp is obtained by using this system. It shows a good agreement with the measurement results of precision thermocouple which validates the effectiveness of the developed temperature measurement system. Finally, this system is used to acquire the thermal expansion of leader discharge voltage in a 1m rod-plane gap, and the measurement results are discussed.
Research on Target Magnetic Properties Based on Multi-magnetic Dipole Model
Authors: Xu Chaoqun , Huang Kui , Dai Jialong , Meng Lifei , Yi Zhong
Published: September 2019

It is difficult to accurately analyze and master the magnetic properties of irregular objects with complex internal magnetic structure. In this paper, the multi-magnetic dipole model of magnetic target is established. The magnetic field data around the magnetic target are measured by magnetometer array, and the position of the multi-magnetic dipole is searched by genetic algorithm, and the fitting error is detected at the same time. The experimental results show that the magnetic field model established by this method has high accuracy and the errors of magnetic field and magnetic moment are less than 5%. This method is beneficial to the research and engineering application of magnetic properties of objects.
Experimental study on thermal performance of roof and floor capillary radiant heating systems
Authors: Zou Hang , Long Enshen , Zhang Yin , Ding Pei
Published: September 2019

This research picks up the bedroom and study of a residential building in Chengdu as the research object. The temperature variations in the supply water of the room, the surface temperature of roof and floor, and the indoor air is analysed when the capillary ends were located on the roof and the floor respectively. Furthermore, the internal mechanism of the different heating environments of the two heating modes is revealed by analysing the heat flux density. The results show that: under the same water supply temperature and flow rate, the thermal response time of the roof radiant heating is shorter and the stability of the surface temperature of the floor radiant heating is better due to the different thickness of the capillary network. The floor heating room has more uniform distribution and better comfort. The heat transfer characteristics of the roof and floor surface are different, and the variation of the radiation and convection heat transfer amount are also different. The heat flux density of the roof increases faster and the maximum value can be reached in only 60 minutes, while the floor needs 156 minutes. The roof heating is about 4.36% higher than the floor heating in the proportion of radiation heat exchange. Thus, roof radiant heating is preferred for intermittent heating. This paper provides a reference when designing the end of the residential heating systems.
Microwave-assisted Chelating Agent Extraction of Pectin from Hawthorn Wine Pomace
Authors: Chen Xiaowen , Zhu Chuanhe
Published: September 2019

Pectin was extracted by microwave-assisted chelating agent (sodium hexametaphosphate) method from hawthorn wine pomace. Based on single factor experiments, the effect of chelating agent dosage, solid-liquid ratio, microwave power and microwave time on extraction rate of hawthorn pectin was evaluated by response surface methodology. The results showed that factors of effect on extraction rate in order from large to small were solid-liquid ratio, chelating agent dosage, microwave time and microwave power. The best process factors were: chelating agent dosage of 1.35 %, solid-liquid ratio of 1:9, microwave power of 440 W and microwave time of 80 s. Under these conditions the average extraction rate of hawthorn pectin was 72.89 ± 0.45 %, which was basically consistent with the predicted value. It was showed that this model was reliable.
Thermodynamic Analysis on Hydrogenation Process of Phenol of Bio-oil Model Compound
Authors: Liu Liping , Li Yingfan , Cui Yu , Fang Shuqi , Wang Kai , Chen Junying , chun Chang , Li Hongliang
Published: September 2019

In this paper, the thermodynamics on the hydrogénation of phenol as a model compound of bio-oil was simulated based on Gibbs free energy minimization. The reaction system was determined according to the reaction mechanism of the phenol hydrogenation and the effects of reaction conditions on the equilibrium products were studied. The results show that benzene and cyclohexane are easily formed thermodynamically under reaction conditions. For the reaction system of selective hydrogenation of phenol to cyclohexanol, low temperature, high pressure and high molar ratio of hydrogen to phenol can improve the conversion of phenol and the selectivity of cyclohexanol. The optimum thermodynamic conditions for the hydrogenation of phenol to cyclohexanol are as follows: reaction temperature 400-600 K, reaction pressure 3.0-7.0 MPa, molar ratio of hydrogen to phenol 4.0-7.0. The simulation results are compared with the related experimental results.
Research on Carrier Recovery Algorithm in Coherent Optical Communication System
Authors: Liu Jiaoyang
Published: September 2019

In coherent optical communication system, the random deviation of optical phase which is caused by the spontaneous emission of laser leads to phase noise, resulting in a random rotation of signal constellation. In order to ensure the reliability of the communication system, carrier phase estimation and recovery are required at the receiver. In this paper, we investigate two traditional carrier phase recovery (CPR) algorithms, including Viterbi&Viterbi phase estimation (VVPE) and blind phase search (BPS) algorithm. On this basis, we also discuss seven improved algorithms. Then we compare and analyze the hardware complexities of eight different CPR algorithms. In addition, the cause of equalization enhanced phase noise (EEPN) and its impact on the carrier phase recovery algorithm are also discussed.
Molybdenum Addition Enhancing the Corrosion Resistance of Ni16Cr Alloy in Aqueous Solution
Authors: Q.G Cheng , Jianting Li , Weiliang Xiong , Yang Tangying , Liu Zhao , Wang Yueping , Shi Yongbing
Published: September 2019

The influences of Mo on the structures and the electronic properties of passive films on Nil6CΧMo (Χ=0wt.%, 2wt.%, 5wt.%, 8wt.%, 12wt.% and 16wt.%) alloys in pH 1.0 sulfuric acid solution, pH 8.5 borate buffer solution and pH 13 sodium hydroxide solution were investigated using X-ray photoelectron spectroscopy (XPS), potentiodynamic polarization curve, Electrochemical impedance spectroscopy (EIS) and Mott-Schottky plot. The results showed that the addition of Mo can evidently refine the microstructure of Ni16Cr alloy, and the grain size sharply decreased with increasing Mo. Ni16Cr alloy was passivated in pH1 sulfuric acid solution, pH8.5 borate buffer solution and pH13 sodium hydroxide solution, each passive current density decreased and each passive potential region enlarged with the increment of Mo. XPS results showed that the passive films on Ni16CΧMo alloys were mainly composed of the inner Cr2s3 layer and the outer NiO layer with a little amount of Cr2S3, NiS and NiSO4. The resistances and compactness of the passive films on Ni16Cr alloy in the three solutions increased with the increased Mo, which implyed the enhanced protection of the passive film. Mott-Schottky plots revealed that the passive film on Ni16Cr alloy appeared the p-n heterojunction, the defect number of the outer film increased with the increment of Mo, while for the inner film, the defect number decreased with Mo, while the total protection of the passive films to the metal matrix was improved with increasing Mo.
Study on A-TIG welding of Q245R/321 dissimilar steel
Authors: Zhang Rijun , Wu Qiyou , Wang Lin , Zeng Chao , Wang Xiangjiang
Published: September 2019

This paper mainly studies the welding of stainless steel 321 and carbon steel Q245R dissimilar steel. Welding tests of stainless steel 321 and carbon steel Q245R are carried out by A-TIG welding method. The effect of active agent on weld penetration, weld formation and inner hole slag inclusion is studied. The mechanical properties of welded joints is measured by tensile and bending mechanics tests, and the macroscopic and microscopic structures are observed. Furthermore, these tests and research results are compared with conventional TIG welding. The results show that the welding of dissimilar steel with A-TIG welding method is well formed, and there are no pores, cracks and slag inclusion in the weld. The weld microstructure of the two welding methods is mainly austenite and ferrite. In the Q245R side heat affected zone (HAZ), the migration of carbon elements is obvious, but the A-TIG welding joint is superior to the conventional TIG welding in strength and toughness.
Advances in research on repairing heavy metal pollution in soil by clay minerals
Authors: Na Wang
Published: September 2019

To reveal the repair potential and effect of clay minerals on heavy metal contaminated soil, this paper summarizes the application of common clay minerals such as kaolinite, montmorillonite and zeolite in the repair of heavy metals, and repairs heavy metals with clay minerals and biochar, lime and chelating agents. Correlation analysis illustrates the potential and mechanism of clay minerals for heavy metals. For one thing, clay minerals have a large specific surface area and a negative charge on the surface, which greatly increases their adsorption properties for heavy metals. for another, clay minerals have high nutrient elements and rich organic matter, Which increase soil fertility and trace elements, as well as crop yield. Clay minerals have been widely used in soil heavy metal pollution repair, but most of them still stay at the laboratory level. In the future, more attention should be paid to the application of clay minerals in practical engineering.
Discussion on Factors Affecting the Removal of Organic Pollutants in Reverse Osmosis Concentrated Water of Landfill Leachate
Authors: Huang Xing Hua , Chen Qiu Lin , Xin Peng , Liu Hong , Jia Zhen Fu
Published: September 2019

Landfill leachate reverse osmosis concentrated water (RO concentrated water) is a kind of wastewater with high organic matter concentration, chemical oxygen demand (COD), turbidity, and chroma. The RO concentrated water is pretreated using coagulation method; then the coagulation effect of FeCl3, Fe2(SO4)3, Fe(NO3)3 and PAC on the leachate RO concentrated water is investigated in the experiment. The result shows that FeCl3 is the best coagulant. The removal rate of total organic compounds (TOC) reaches the highest (92.23%) under the condition of 8.0 g/L FeCl3 dosage, pH=6, 3 mg/L PAM, and 150 r/min rotation speed, and the removal rate of COD, NH3-N, and chroma are 73.91%, 28.3%, and 79%, respectively.
Process and development of ozone-biological activated carbon treatment for micro-polluted raw water
Authors: Du Zhehua , Lin Xin
Published: September 2019

The basic principle and process flow of ozone-biological activated carbon treatment of micro-polluted source water were analyzed, and the application of the method at home and abroad was introduced. Some problems that need to be paid attention to when applying the method were put forward. The results show that ozone-activated carbon water purification technology can effectively remove organic matter and ammonia nitrogen in water. It also has good removal effect on inorganic reducing substances, chroma and turbidity in water. Moreover, the mutagenic activity of effluent can be effectively reduced to ensure the safety of drinking water. Some problems which should be attended are prompted when this technique is in application in the paper. It is a water purification technology worth promoting.
Synthesis of a novel type of difluoro (tetrafluoro) pyrazole amide insecticide
Authors: Mingming Zhang , Jianxin Sun , Minghui Wang , Liangzhong Xu
Published: September 2019

Chlorantraniliprole was used as a lead compound to design and synthesize two novel fluorine-containing pyrazole amide compounds. Their strectures were confirned by 1H NMR and HRMS. Their insecticidal activities were evaluated by against plutella xylostella and chilo suppressal. The results of insecticidal activity test demonstrated that the two target compounds have better insecticidal activity against plutella xylostella and chilo suppressalis than the commercial chlorantraniliprole.
Application of A High Efficiency Composite Denitration Agent in Ceramic Roller Kiln Flue Gas Treatment: A Case Study
Authors: Huang J H , Tang Z J , Fang P , Zeng W H , Tang Z X
Published: September 2019

With the increasing stringent environment pollution emission standards, the ceramic industry is facing a great challenge of NOx control. The research and application of highly efficiency deNOx technologies for ceramic roller kiln are benefit both to ceramic industry and environmental protection. Selective non-catalytic reduction (SNCR) is among the leading edge of the hotspot of NOx control. However, most of the reported investigations were laboratory scale study, which were limited to representing the performance of SNCR denitration agent at real application. In this study, we compared the performance of a self-made denitration agent with traditional ones, and the effect of spraying rate and position on NOx removal efficiency were investigated at a 20000 m2/h ceramic product line. Besides, a continuous experiment was carried out. By the work conducted in a real gas, a number of first-hand data focusing on SNCR technology for deNOx of ceramic roller kiln and its possibility of coupling with existed wet absorption process were shared in this paper.
Effects of Living Pterocypsela laciniata and Its Straw on Nitrogen Uptake of Grape Seedlings under Selenium Stress
Authors: Yang Liu , Huan Yunmin , Lin Lijin , Liao Ming’an
Published: September 2019

Pot experiments were conducted to investigate the nitrogen (N) uptake of grape seedlings by intercropping and straw applying of Pterocypsela laciniata. The results showed that five treatments: the monoculture of grape, grape intercropping with P. laciniata, the root straw of P. laciniata applied, the stem straw of P. laciniata applied and the leaf straw of P. laciniata applied. All treatments significantly increased the content of total N in grape roots, leaves and shoots of grape seedlings. The straw applying significantly increased the content of total N in grape stems, and the stem straw of P. laciniata had the greatest effect on promoting N uptake of grape. When the stem straw of P. laciniata was applied, the soil alkali solution N content was increased by 9.93%. Therefore, applying stem straw of P. laciniata can not only promote N uptake by grape but also increase soil alkali solution N content.
Experimental investigation of the effect of salt wedge on concentration of suspended non-cohesive particles in turbid flow
Authors: Yin Xiaoling , Yang Bangjian , Ying Zeng , Huang Shuqin , Yu Lanxin , Lu Chen
Published: September 2019

To have an insight of the effects of salt wedge on suspended sediment concentration (SSC), we carried out experiments of intruding salt wedge in flume with fresh turbid water of non-cohesive particles and salt water free of sediment. Two sets of Acoustic Doppler Velocity Profiler (ADVP) were used to record instantaneous velocity profiles in the saline affected zone near the bed. The acoustic back scattered signal amplitudes (AMP) in the measurements were used to estimate SSC at the same point and the same time. The results show that around the interface shear of exchange flow is remarkable and SSC increases noticeably. Flow analysis indicates that large scale turbulence from interfacial instability is the main power source to enhance sediment carrying capacity of the flow. It weakens and retards the particles in the upper turbid layer sinking to the lower saline zone. However, the energy dissipation doesn’t show much change.
Experimental study on sand solidification with microbial cement
Authors: Fengling Ma , Rong Li , Yao Xu , Saojiang Wang , Mingdian Fang
Published: September 2019

Selecting four types of sand with different ranges of particle diameter, the strength tests of sand solidification with microbial cement are carried out in this paper. With experimental conditions in this paper, most of the strengths of solidified sand with microbial cement are in the range of 1.2∼2.7MPa. Particle gradation is an important factor that affects the solidification of microbial cement. And the perfusion method is more suitable for the sand with appropriate porosity and good connectivity which is easy to be perfused, but not for clay and sludge. The stirring molding method is more suitable for clay and sludge which have much content of fine powder. The strength of solidified sand is related to the direction of perfusion; and the strength of its upper part is higher than that of the lower part. Compared with other solidification materials, the solidified sand with microbial cement has no obvious advantages, due to its low strength, many limitations as well as complex construction technology; dnd its application field needs further study and exploration.
Magnetic fabric study of the Keziletage pluton in east part of southern TianShan and its tectonic implications
Authors: Huawei Wang , Nan Zhao , Changhong Yan , Wei Xiao , Chi Zhang
Published: September 2019

The Keziletage pluton which plays an important role in studying the nature of continental lithosphere and restraining the tectonic evolution of the Southern TianShan orogenic belts is located in the middle of the Keziletage synclinorium, a secondary tectonic unit of the South TianShan syncline fold belt. Emplacement mechanism of the Keziletage pluton in Xinjiang is studied through detailed analyses of magnetic fabrics. Data from 28 sampling sites within the pluton show that the value of the average susceptibility (K
m
) is high. The corrected anisotropy degree (P
j
) is less than 1.2, which can be an indicator of flow magnetic fabrics. The shape parameter (T) of magnetic susceptibility ellipsoid displays that the Keziletage pluton is dominated by oblate compression fabric. Although the magnetic fabrics show NE-SW compression as a whole, the magnetic lineations are little over magnetic foliations. We suggest that the collision of Tarim blocks to YiLi-mid TianShan micro-plate became much weaker during the emplacement when the regional tectonic setting was changing to extension environment.
Experimental study on the effect of filler size on the denitrification of SBBR process in low temperature
Authors: Bian Dejun , Yan Yiming , Wu Ji , Ai Shengshu , Wang Fan , Nie Zebing
Published: September 2019

In order to study the effect of filler size on the treatment of low temperature wastewater by SBBR process, three groups of SBBR reactors were established. They used cubic sponges with side lengths of 1, 1.5 and 2cm as filling fillers, respectively. The denitrification effect of the three fillers was compared under the conditions of stable water temperature of (10±1)°C, HRT of 10h and reactor filling rate of 16%. The results showed that the removal of NH4+
-N and TN in the reactor with the filling size of 1cm was the best, and the removal rates were 96% and 80%. The NH4+
-N and TN removal rates of the reactors filled with the other two sizes of fillers were all below 80% and 70%. The membrane biomass measurement of the reactor showed that the smaller size of the filler has a larger specific surface area, which was beneficial to mass transfer and microbial growth and enrichment, thereby promoting the denitrification of low temperature wastewater.
Girder crack of concrete single pylon cable-stayed bridge
Authors: Yong-jian Zuo , Deng Li , Sheng Zhang , Li-rong-jun Ying
Published: September 2019

Taking the reinforcement and maintenance project of a concrete cable-stayed bridge as the background, aiming at the stress cracks on the web of the box girder of the main bridge after several years of operation, starting from the actual situation of design and construction, the integral calculation model of the bridge is established by Midas Civil and the local analysis and calculation model of the main girder is established by the general finite element software. Four kinds of analysis and calculation models are analyzed. Finally, it is shown that the web cracks of the bridge are caused by the cable tension when the bridge is cantilevered. On this basis, the concrete and feasible bonded steel plate method is proposed to repair and strengthen the cracks, which is of certain reference significance for the reinforcement and maintenance of the same type of bridge cracks in the future.
Pollution Characteristics and Risk Assessment of Heavy Metals in Sediment from Shenzhen-Zhongshan Channel
Authors: Wang Zhaoming , Zhang Dong , Ni Dong , Yuan Minmin
Published: September 2019

In order to study the pollution status of heavy metals in sediments of Shenzhen, the concentrations of heavy metals Cu, Pb, Zn, Cd, Cr, Hg and As in sediments were measured at 15 locations in the western man-made island. The results shows that, on average, Zn was the highest, 108.61mg.kg−1, followed by Cr, the smallest average of Cd was only 0.22mg.kg−1. Except Cd, the coefficient of variation of the remaining 6 heavy metals is relatively small. The coefficient of variation between is 12% to 36%, which is moderately mutated. The coefficient of variation of Cd is 55.73%. In the investigated surface sediments, the levels of 7 heavy metals were low. According to the potential ecological risk assessment, the ecological environment of the sediments in the study area is excellent, and the potential ecological hazard of each heavy metal is low.
Study on Regions Non-point Source Pollution at Different Management Level in Longgang District of Shenzhen
Authors: Liu Yanting , Liang Qiong , Liu Yun , Song Haolu , Li Xuyong
Published: September 2019

In order to understand the regional non-point source pollution at different management level in Longgang District of Shenzhen City, the commercial and residential zone, the cultural and educational zone, the transportation zone, the industrial zone and the urban village were chosen as sampling sites. The surface street dust and rainfall runoff samples were collected after investigating the management levels and the correlation between the management level and street dust or rainfall runoff was analysed. The results showed that the street dust accumulation was the highest in the transportation zone (25 g/m2), which was at the lowest management level. However, the best-managed commercial and residential zone and the cultural and educational zone had a street dust accumulation of about 8 g/m2, which was higher than those in the industrial area and urban village (3.5 g/m2). This may be due to the different size of the crowed flow. In each zone, the large-sized particles contribute a major proportion of the street dust. The N and P contents in the dust was highly correlated with the particle size, but showed no correlation with the management level. The correlation was also observed between the pollutant contents in rainfall runoff and the management level. The low-managed transport zone had the highest pollutant contents, with most of the indicators exceeded the values limited by the Environmental Quality Standard for Surface Water (GB 3838-2002, class V criteria)
Study on the Difference of Surface Temperature among Different Vegetation Landscapes Detected by Ground Thermal Infrared Remote Sensing
Authors: Guo Ming , Liang Qiong , Liu Yun , Zhang JinFang
Published: September 2019

Surface vegetation cover is a difficult problem in surface temperature inversion by thermal infrared remote sensing, thus this paper selected water body as the reference surface, measured surface temperature of five different vegetation landscape types (high tree, tree-shrub-grass, grass, shrub, and tree-grass) by using ground thermal infrared remote sensing instrument and analyzed the temperature difference along the Wenyu river. The results showed that there were seasonal differences of surface temperature among different vegetation landscape, the seasonal variation of shrub surface temperature was the most stable, but those of tree-shrub-grass was the most unstable; the directional difference of the surface temperature among vegetation landscape was influenced by the slope, given the consistent slope, the order of directional difference of surface temperature among vegetation landscape types was: tree-grass > high tress > tree-shrub-grass > shrub >grass; there was different respond relationship between surface temperature and vertical temperature among vegetation landscape, in which there was linear equation model (y = b1x + b0) for the two types of high-tree and shrub, Joe forest and shrub forest, “S” type curve model (y = exp (b0 + b1 / x)) for the three types of tree-grass, grass, and tree-shrub-grass.
Formation analysis and characteristic estimation of the debris flow disaster of Mengdong River, Malipo County on September 2nd, 2018
Authors: Chen Zhi , Liu Chuanqiu , Zhou Yue
Published: September 2019

Based on the on-site investigation of debris flow disasters in Mengdong River Basin of Malipo County on September 2, 2018, the characteristics of disasters and their formation and evolution process are analyzed from the aspects of source, topography and water resources. Heavy rainfall is the inducement factor of this debris flow. The complex topographic and geomorphological features in the channel provide conditions for the evolution and scale-up of the debris flow: (1) hundreds of shallow soil landslides in the region provide sufficient material resources for the debris flow, enhance the hydrodynamic conditions of the debris flow and increase the amount of erosion along the way; (2) multiple bedrock entrapments and falls in the channel enlarged the debris flow. The scale and velocity of debris flow; (3) The volume weight of debris flow increases gradually with the supply of solid materials along the way. The study shows that precipitation is the fundamental cause of debris flow. The precipitation causes the initiation and overlap of landslide, slope and channel sources in the valley. From the development trend, the debris flow in the valley is in the stage of high frequency development, and the possibility of large-scale debris flow still exists. The possibility and frequency of occurrence will be greatly increased. High frequency and small and medium-sized debris flows will be the characteristics of debris flow activities in this gully in the future. It is necessary to control ditches in time and strengthen monitoring and early warning.
Investigation and Survey on the Standardization of China’s carbon emission trading market Based on the Government Demand Analysis
Authors: Guo Huiting , Liu Mei , Yang Ming , Zhang Sinan , Zhao Xuezhi
Published: September 2019

In 2017, China’s carbon emission trading market was officially launched. This paper summarizes the work of the seven carbon emission trading pilots and the implementation progresses of the key industries that participated in the program. This work serves as an important basis to support the establishment of the standard system of China’s carbon emission trading market.
Analysis of Consumer Behavior of Forest Tourism in Beijing
Authors: Ying-hui Huang
Published: September 2019

Forest tourism is a new economic growth point for forestry economy, and the market space is huge. There are good resources and market conditions for developing forest tourism in Beijing. In order to understand the consumption needs of residents for forest tourism, this paper investigates the consumption behavior of forest tourism in Beijing by means of questionnaire interviews. The results show that forest tourism can meet the needs of tourists to a certain extent, but there are still some shortcomings in Beijing. Based on this, some recommendations are made such as enriching the types of leisure products and improving service quality, etc.