bluuebunny/crossref_metadata_2025 huggingface dataset:
Force and resolution analysis in Kelvin probe force microscopy using nanotube probes
Authors: Xu Jie , Chen Jianfeng , Chen Long , Cai Yuanlingyun , Yu Tianqi , Li Jinze
Published: September 2019

Multiple approaches have been exploited to improve the resolution and sensitivity of Kelvin probe force microscopy (KPFM), among which an apparent method is to use probes with sharp tip apex or with nanotube attached. In this paper, the electrostatic force in KPFM with nanotube probe was calculated by Green’s function theorem and boundary element method. Based on the force analysis, the sensitivity and resolution of KPFM using ordinary and nanotube probes were further quantitatively compared with each other. It was found that KPFM measurement with nanotube probe had a better resolution, however, the sensitivity deteriorated under air condition that might constrain its applications.
Analysis of axial crushing of fiber reinforced metal tube with an eccentricity factor
Authors: Liu L Z , Tang Y , Wang C Q , Zheng F X
Published: September 2019

The fiber reinforced metal tubes have been proved to exhibit an excellent crashworthy performance and a high ratio of strength to weight in many experiments. Some theoretical models are promoted to predict the mean crushing force, which benefits the design of these structures. Based on the solution of Wang and Lu, the theoretical analysis is presented in this paper to consider the eccentricity factor, which represents the ratio of the outward part to the total folding length. The agreement between the calculated and experimental data reveals that the analytical model is reasonable.
Efficient Electrolytic Water Splitting with FeCoPt Trimetallic Cubic Nanocatalysts
Authors: Wang Shuang , Deng Zehui , Li Jing , Liu Haiqin , Wang Yijun , Fu Xiaoqi
Published: September 2019

Electrocatalytic water splitting to hydrogen energy provides an environmental, cost-effective, and sustainable approach to address worldwide energy and carbon emission challenges. Here we report a facile method for preparing trimetallic cubic nanoparticles for electrolytic overall water splitting by galvanic replacement of FeCo alloys with Pt salt solution. The as-synthesized FeCoPt trimetallic nanocatalysts demonstrated excellent activity and stability for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) catalytic performance in 1.0 mol L-1 KOH. The FeCoPt-2 sample afforded a current density of 10 mA cm-2 at a low overpotential of 178 mV for HER and 305 mV for OER. The present study provides a facile and cost-effective synthetic process to prepare trimetallic FeCoPt nanocatalysts as high-performance electrocatalysts for overall water splitting.
Preparation of Antifouling Biomimetic Membrane in Water Treatment
Authors: Hu Jiyu , Zhang Liqing , Zhang Zhiqiang , Yang Zhenhao
Published: September 2019

In this paper, the preparation of antifouling biomimetic membrane in water treatment was reviewed from three aspects: superhydrophobic antifouling surface, hydrophilic antifouling surface and reactive self-cleaning surface. The antifouling biomimetic membrane has higher water flux and separation performance, and has broad application prospects in water treatment such as oily wastewater, dye wastewater and protein wastewater. Finally, based on the current research on antifouling biomimetic membrane, the future research directions of biomimetic membranes are proposed, and the development and prospects of antifouling biomimetic membrane in water treatment are prospected.
Study on The Preparation Technology of Poly-Silicate-Aluminum-Ferric (PSiAF) Coagulant Using Coal Gangue as Raw Material
Authors: Yang Yuping , Zhao Qingcai , Zeng Furong , Zhang Yuanfei
Published: September 2019

Si, Al, Fe were leached from coal gangue to prepare Poly-silicate-aluminum-ferric (PSiAF) coagulant. The optimal technology of preparation of PSiAF was explored through single factor experiment and orthogonal experiment. The effect factor of preparation, such as the content of silica, the molar ratio of Al to Fe (nAl:nFe), the molar ratio of metal (Al+Fe) to Si (nAl+Fe : nSi), the pH of the solution of sodium silicate, were investigated. Results show that The optimal preparation technology were the content of silica of 4%, Al/Fe molar ratio of 1:2, (Al+Fe)/Si molar ratio is 1:1 and pH of 5 of the solution of sodium silicate.
Dynamic mechanical response for bituminous mixtures in wide frequency range
Authors: Yin Y L , Yang Z H , Shi M L
Published: September 2019

The rheological properties of bituminous mixtures at different test temperatures have been determined by means of a Dynamic Mechanical Analyzer (DMA) via frequency sweep with a relatively wide range between 0.02 Hz and 200 Hz. The measurements were carried out by controlled-strain mode in three-point bending beam test. Continuous spectra were obtained, covering four decades of the frequency scale for phase angle as well as storage and loss moduli with loading frequency. The storage and loss moduli are found to increase as loading frequency increases and temperature decreases. The variation of phase angle with frequency is complicated. Under low test temperature, the phase angle decreases with increasing frequency; under higher temperature, it shows a contrary trend. It is interesting that a peak phase angle appears for these bituminous mixtures in the intermediate temperatures. In addition, the DMA measurement can be used as an effective method to evaluate the viscoelastic properties of bituminous mixtures with fine aggregates.
Finite Element Analysis of Geotechnical Excavation Based on COMSOL Multiphysics
Authors: Han Jue , Ma Qianqian
Published: September 2019

As the current geotechnical excavation process is affected by many factors, excavation will easily lead to abnormal conditions in the geotechnical excavation process. Based on this, this study used COMSOL Multiphysics finite element analysis to analyze the various factors affecting the geotechnical excavation process and set the various parameters of the project. This study studied the geotechnical excavation works in the presence of buildings and the absence of buildings. At the same time, the data were statistically analyzed and the changes of various parameters in the process of geotechnical excavation were studied on the basis of finite element simulation analysis. The research shows that COMSOL Multiphysics finite element analysis can effectively imitate the geotechnical excavation conditions and draw effective laws, which will be helpful for the effective development of follow-up projects and provide theoretical reference for subsequent related research.
Modeling and simulation of high-speed cylindrical grinding based on 3D grinding wheel topography
Authors: Chen H P , Cao H Y , Wu R L , Lu C
Published: September 2019

The purpose of this paper is to establish a 3D virtual grinding wheel to illustrate the high-speed cylindrical grinding process of difficult-to-machine materials under various process parameters. Based on Monte Carlo method, the abrasive grain is modeled cutting spherical solid with random planes, and the random distribution of grains is obtained based on the virtual grid method. Then the grinding wheel topography is trimmed to adjust the protrusion height of abrasive grains. The simulations of high-speed cylindrical grinding under different grinding conditions are carried out considering the thermomechanical coupling effect of grinding wheel and workpiece. The 3D grinding wheel is validated by analyzing the grinding force ratio. The effects of cutting depth on the grinding performance, such as grinding force, workpiece temperature, effective stress and surface quality, are discussed. The results show that a smaller depth of grinding is beneficial for better surface quality.
The Theoretical Research on Technical Advance and Innovation Integration of Tapping Machinery
Authors: Wang Lingling , Cao Jianhua , Zheng Yong , Huang Chang , Wu Sihao
Published: September 2019

Mechanical tapping becomes an important issue to be resolved in urgent need at present, which is one hot problems of the technology research at present. This paper introduces the progress and frontier of tapping technology, and analyses and summarizes the research on semi-automatic tapping machinery and automatic tapping machinery. The development of mechanical tapping is still at the exploration stage, and the fundamental theory research is insufficient. The technology needs to move from prototype stage to more mainstream use for quite some time. The type 4GXJ-I of cordless brushless tapping knife designed by our team and automatic tapping machinery designed by Zhenkun Xu in China, have presented obvious advantage in the study of mechanical tapping machine. Application of mechanical tapping machines has a very important significance to sustainable development of natural rubber industrial economy.
Motion and Static Simulation of Horse Riding Machine
Authors: Yang Xi
Published: September 2019

Horse riding machine is a typical fitness equipment, which is widely used in various fitness places. 3D model of the riding machine is established by using SolidWorks to make people feel more comfortable. Motion simulation is conducted to obtain the position, velocity and acceleration of the saddle, pedal and armrest. Then, static simulation is performed to get the maximum stress of the horse riding machine.
Analysis of aerodynamic characteristics of flapping process of imitation beetle folding wings
Authors: Wang Xinjie , Hu Kun , Wang Caidong , Zhang Zhigang
Published: September 2019

In this paper, the beetle rear wing is used as a bionic object to study the aerodynamic characteristics of the flapping wing aircraft during flapping. Firstly, a three-dimensional folding wing three-dimensional model was designed according to the folding mechanism of the beetle wing. Then the influence of different flapping angle of attack, torsion time and crease width on the aerodynamic characteristics of the rigid folding wing was analyzed by ANSYS FLUENT software. The results show that the flapping angle of attack has a great influence on the aerodynamic characteristics of the foldable wing. Appropriate reduction of the torsion time and crease width can improve the aerodynamic characteristics of the folded wing.
Vibration analysis of milling process with helix-angle cutter based on Euler method
Authors: Jin G , Zhang XY , Li ZJ , Sun GX
Published: September 2019

The chatter vibration is the major limiting factor in increasing the metal removal rates of the machine tools. In this paper, a program for dynamic analysis of thin-walled milling process with helical milling cutter is developed, based on Euler iteration. The program can take into account the characteristics of thin-walled workpiece, the contact separation between workpiece and cutter, the helical angle of cutter teeth and other actual cutting process characteristics. Based on the stability lobe diagram obtained by semi-discrete method, the stability simulation in different cutting parameters around the stable island was carried out. The unstable form of the cutting process was determined by spectrum analysis and Poincare mapping method. The results show that the method is in good agreement with the results of stability Lobe diagram and can capture the stability island in small radial cutting process. This method can well grasp the cutting force and vibration evolution process in cutting process, and provide an effective means for stability analysis of cutting process.
Quantification characterization of micropores in G20Mn5N cast steel at two different stages
Authors: Yan Huadong , Jin Hui
Published: September 2019

Cast steel is an important metal material that is widely used in civil engineering structures due to its high strength and good ductility. However, a variety of casting defects such as micropores are usually present in the as-cast components. Casting defects are the main factors leading to the degradation of mechanical properties. In this paper, X-ray tomography is used to quantify the quantity, size distribution of micropores in G20Mn5N cast steel. In the nine notched samples, the quantity of pores increases from 2726 in the undeformed stage to 6440 in the fractured stage. Compared with the undeformed stage, the total volume and the average volume of the micropores in the fractured stage are also increased. Furthermore, the distribution of equivalent pore diameter of the two stages is studied, which is consistent with the three-parameter lognormal distribution.
Casting simulation of cast steel joint based on Pro-CAST
Authors: Gao Yiqi , Sun Sijia , Jin Hui
Published: September 2019

The casting process is usually divided into five steps of melting, molding, casting, heat treatment and testing. This paper focuses on the two stages of casting and quality inspection of a casting process for a cast steel joint in actual engineering. Studies have shown that the sharp change or improper arrangement of the sections of cast steel joints will make certain areas more likely to produce defects than other areas, and these areas are often complex stress locations when they are in service, which leads to “risk-on-risk”. So both structural design and process design should pay attention to these issues. The analysis results show that ultrasonic flaw detection can detect casting defects but cannot be quasi-deterministic. The setting of riser and cold iron plays a key role in casting quality. The design of riser has a great influence on the generation and distribution of casting defects.
A scalable fuzzy division model of topological space on GIS
Authors: Jun Xiang
Published: September 2019

It is difficult to describe topological relationship of complicated geographical phenomena and entity with fuzziness and uncertainty in the real world. Aiming at the above problem, this paper has summarized to the topological relationship of between spatial entities with 4-intersection model and 9-intersection model firstly. On the basis of point-set topology, the formal description model of the topological relationship between fuzzy geographical entities is analysed and gives a detailed and accurate formalization-description and strict math formula. Lastly, this paper proposes a method, which improves and expands topological division to between fuzzy geographical entities. It shows that analysing result, the model can analyse and divide the entity fuzzily from simple entity to complicated entity.
Research Advances in Tight Oil and Its Prospect
Authors: Si Qinghong , Sima Xianzhang , Zhang Chao , Wang Shanbo , Zhang Bo , Zhu Qiang
Published: September 2019

Tight oil has broad prospects for exploration around the world. There have been achieved success exploration and development of tight oil reservoirs in some foreign basins. China has a large area of unconventional oil and gas resources, of which coalbed methane and shale gas have been well studied, but tight oil is still in its infancy, and its evaluation basis is still weak. By analyzing the control factors of tight oil accumulation, the accumulation process and the accumulation dynamiction, it is believed that the basic theoretical work of tight oil accumulation should be carried out as soon as possible. Especially, there is an urgent need for breakthroughs in the study of the time relationship between tight oil accumulation and reservoir densification and formation mechanism of tight oil reservoir-forming dynamiction.
Circulating current suspression for parallel modular energy storage converter based on improved single neuron PID
Authors: Xu Jun , Wang Kun , Deng Chaoran
Published: September 2019

To solve the parallel circulating current problem in the operation control of modular energy storage converter, the causes of the parallel circulating current are analyzed, and a new circulating current suppression method based on improved single neuron PID is proposed. The superiority of the method is verified theoretically by building simulation model. The test verification is carried out by developing 50kW power module and 150kW modular energy storage converter prototype. The results show that the method can effectively suppress parallel circulating current and solve the problems of difficult parameter adjustment and poor adaptability to power mutation in traditional PID control.
RETRACTED: Research on the Construction of Early Warning Index System of Network Public Opinion Emergency Based on Computer Simulation
Authors: Ge Hongbing
Published: September 2019

Under the current social background of our country, the dissemination environment, dissemination background, audience characteristics, media environment and event types of network public opinion are constantly developing and changing, and the influencing factors will also have new changes. The early warning index system of network public opinion emergencies is an important part of the crisis management of network public opinion. The analysis of network public opinion is based on the complete and accurate grasp of network public opinion. The early warning of network public opinion emergencies is based on the full exploitation and utilization of network public opinion data. Through the analysis and judgment of public opinion, the early warning mechanism of network public opinion emergencies can be improved. Computer simulation is a fast and economical important research tool, and the effectiveness and accuracy of computer simulation depends on the performance of computer simulation software tools. Using computer simulation and simulation of the process of user concept in event propagation, dynamic evolution simulation of events is analyzed according to the results of user concept, and hot events are identified.
Localization Transformation of Industrial Residential System: A Case Study on SI System in China
Authors: Zou J M , Tang S N
Published: September 2019

The SI (SkeIeton-Infill) System originated from Japan and introduced to China in 2006. The build-up projects proved the technical feasibility of SI System in China. However, the localization transformation of SI System has not completed in China. Based on literature review, the main determinants of influence mechanism are revealed to be housing ownership model, residential scale, and residential form. The content analysis revealed the potential influences on the uptake of SI System in China. This research sought to reveal the influence mechanism of social environment on industrialized design system. The practical value of the research is providing guidance for policy makers and designers to help them improve design quality of SI System in China.
Effect of Pre-stress in Steel Strips to Strengthen Unreinforced Brick Masonry Walls under Axial Loads
Authors: Jing Deng-Hu , Zhang Han , Bao Ning
Published: September 2019

Using steel strips to strengthen the existing unreinforced masonry walls has competitive advantages, which includes no wet work, avoidance of formwork, time saving, ease of installation, minimal increase of dimensions, no requirement for material strength of the existing walls and good reversibility. In this paper, seven specimens were fabricated and tested under axial loads for obtaining the effect of pre-stress in steel strips to strengthen unreinforced brick masonry walls. Test results showed pre-compression stress in the vertical steel strips could increase the load of cracks in the single brick in the wall, otherwise steel strips only improved the load of continuous cracks and the failure load, and the axial stiffness of the wall; when the transverse steel strips were pre-tensioned, it could further improve the failure load and the later axial stiffness of the strengthened wall.
Research on the characteristic of seismic damage and seismic design of reinforced concrete simply-supported girder bridge
Authors: Dai Pan , Xu Peng , Lu Jiufei , Zhao Gaojin , Mao Dejun
Published: September 2019

In previous earthquakes, the bridge in the earthquake zone has been seriously damaged; especially the reinforced concrete simply-supported girder bridge that with poor integrity. In order to study the earthquake damage character and behavior of the reinforced concrete simply-supported girder bridge, according to the survey data of earthquake damage of the reinforced concrete simply-supported girder bridge, that occurred in several major earthquakes in China in recent years, earthquake damage characters of this kind of bridge are classification analyzed. According to the earthquake damage characters, seismic design countermeasures are put forward, which can provide reference for aseismic design of reinforced concrete simply-supported girder bridge.
Construction of risk evaluation index system of housing construction project based on PSR theory
Authors: Cheng Lian-Hua , Zhang Yan-Hua , Wang Zi-Yue
Published: September 2019

In order to enhance the comprehensiveness and rationality of the construction risk assessment index system construction project, this paper divides the risk assessment unit according to the risk composition and risk characteristics of the accidents during the construction of the housing construction project, combined with the actual situation on site. Through the analysis of accident cases, relevant norms and standards, and the analysis of domestic and foreign literatures, the risk factors affecting the construction safety level of housing construction projects are extracted. At the same time, the theory of PSR is introduced to broaden the research scope of engineering construction risk assessment, and the construction model suitable for the construction process evaluation model of housing construction project is proposed. Based on the causal relationship of various risk factors, a systematic and scientific safety evaluation index system is constructed.
Game Analysis of Project General Contracting Rent-seeking
Authors: Cheng Lian-Hua , Wang Zi-Yue , Zhang Yan-Hua
Published: September 2019

It is important to clearly understand the rent-seeking behavior of all parties involved in the general contracting mode. First, the formation mechanism of rent-seeking was analyzed. Then, the game model of the owners, general contractors, supervision units, government and society during the operation of the general contracting project was proposed, to explore the decision-making space and behavior mechanism of relevant stakeholders. Finally, the optimal decision-making of the game players under different situations was discussed. The results show that the general contractor and supervision rent-seeking probability is affected by the owner’s supervision cost and supervision probability; the probability of owner supervision is related to the ability of owner and government public to supervise and punish rent-seeking behavior; and the ability of government and public to supervise is related to the cost of supervision and the reward value of supervision success.
Performance and Dynamic: Study on Spatial Evolution of Peripheral Areas of Metropolis in Suzhou
Authors: Lei Cheng , Sun Mengyi , Wang Haitao
Published: September 2019

Choosing Suzhou as the research area, taking the administrative area as the unit and starting from the performance and dynamic perspective, this paper analysis spatial evolution characteristics of Suzhou metropolis peripheral area by remote sensing image, constructs spatial performance evaluation system by AHP, and evaluates the spatial performance of the five areas in Suzhou. Combined with the three typical case of Industrial Park, High-tech Zone and Wujiang Region, this paper discuss the mechanism of spatial evolution from the perspective of subject, and sums up three types of spatial evolution and interaction mode of action. The study finds that the types of dynamic have a close relationship with the formation of spatial performance echelon, and reveals the change of performance and dynamic mechanism in the spatial evolution of metropolitan area in Suzhou.
The Present Situation and Design Implications of Traffic Connection in Beijing Railway Transportation Hub Station
Authors: Ma Jing , Fang Ming , Wang Junzhe
Published: September 2019

Through the multi-period, multi-objective and multi-level investigation and analysis of the existing national railway hubs in Beijing, the main problems in the current operation is that the urban space connection and various types of traffic connections. The reason is that the railway hub transportation station should focus on development positioning, site selection layout, traffic matching and predictive design in the planning and site selection design process. The key points can be used as a useful reference in the design of the similar ones.
Exploration and reflection on the practice mode of the responsible planner system in Beijing Core Area from the perspective of urban renewal
Authors: Wang Junzhe , Ma Jing
Published: September 2019

Based on the clear positioning of Beijing core areas in the new urban planning of Beijing, Dongcheng District and Xicheng District have carried out a series of urban renewal work of “Environmental Remediation of hundreds of streets and allies” and “Rearrangement Planning of Blocks”. Both districts explored and established the responsibility planner system in 2017, aiming to achieve refined construction and management in the process of organic renewal, and ensure the implementation of the plan and public participation. This paper, combined with the visiting and investigational results of the urban renewal project in Beijing core areas, sorts out the duties and roles of the responsibility planners in each step, explores the establishment and promotion of the responsibility planner system, analyzes the optimization space of current system and proposes several advices on the follow-up system.
Study on Dust Emission Characteristics of Construction Sites in Hengyang City
Authors: Xie L , Ding Y C , Shi L
Published: September 2019

In this study, six typical construction sites in Hengyang City were selected to monitor the dust emission concentration in earthwork stage, main structure stage and decoration stage. The average monitoring time of each stage is 2 or 3 days, totally 15 days. 45 samples of quartz filter were obtained. The initial emission factors and emission inventory of building dust were estimated based on FDM model. The results show that the average net concentration of earthwork stage, Main structure stage and decoration stage are 162 ug/m3, 72 ug/m3 and 54 ug/m3 respectively. PM10 emission factor is the largest in the stage of earthwork foundation, followed by the stage of main structure, and the lowest in the stage of decoration. The actual emission factors are 0.449, 0.177 and 0.149 g/(m2.h).
Carbon Emission Prediction of Civil Buildings in China based on Improved Grey Prediction Method
Authors: Yuan J B , Liu Y S , Xu J , Gao S H , Li X T
Published: September 2019

Civil construction is an important source of carbon emissions. The implementation of total carbon emission control for civil buildings is an important means to achieve energy conservation and emission reduction in China. The study divides civil buildings into urban residential buildings, rural residential buildings, public buildings, and northern urban heating. The study calculates and predicts the total carbon emissions of China’s civil buildings. Firstly, according to the statistical method of IPCC, the calculation model of carbon emissions of civil buildings is constructed, and the total amount of carbon emissions of civil buildings in China from 2005 to 2016 is calculated by using the energy balance table. Further, based on the improved grey prediction method, the national civil use from 2017 to 2025 is predicted. Total carbon emissions from construction. The forecast results show that in 2017-2025, the annual average carbon emission growth rate of buildings is about 4.65%, and by 2025, the total emission is expected to reach 298.176 million tons of CO2. In order to achieve the 2030 emission reduction target, it is necessary to further optimize the energy structure, improve the energy efficiency of the building, and increase the carbon emission reduction in civil construction.
Design of Position Servo Control System Based on MATLAB
Authors: Ren Shiyong , Miao Hailin , Jin An
Published: September 2019

The position servo system is a feedback control system, and its output variable varies with the input variable, to achieve accurate tracking for the position command by the actuator. The controlled variable (output variable) of the position servo system is the linear displacement and angular displacement of the position of load space. When the given variable (input variable) of the position servo system is arbitrarily changed, the main task of the system is to make the output reproduce a given amount of change quickly and accurately. MATLAB software is widely used in academic and many practical fields. After the system is designed perfectly, we need to use MATLAB software to simulate the results. MATLAB software can well reflect the characteristics of the three-loop position servo system. The system designed in this time belongs to the analog servo system, and its selected model is a high-power three-loop position servo control system.
Study and application of lunar rover tracking measurement technology with laser radar and iGPS
Authors: Chen Qiwei , Tang Laiying , Yang Zaihua , Wang Linzheng , Feng Wei , Zheng Shengyu , Yi Wangmin
Published: September 2019

The topographical data of movement environment and the real-time position and orientation of lunar rover must be accurately measured to test lunar rover’s ability of localization, path planning and mobile control. These data will be used to track the lunar rover’s movement in simulated lunar terrain in real time. Lunar rover tracking measurement technology with laser radar and iGPS is discussed in this paper, and a tracking measurement system is designed to measure and track accurately real-time position and orientation of lunar rover in the topographical data of movement environment. This system can provide some reference for the research of large-scale, high-precision and high-frequency tracking measurement of other rigid objects in specific environmental terrain.
Research on error Analysis of LED chips visual positioning system
Authors: Gong Shihua , Zhou Diyi , Wang Ziyue , Li Delong , Lu Huaiqing
Published: September 2019

With the continuous development of intelligent equipment, the chip positioning accuracy requirements are also constantly improving. In this paper, a mathematical model of the LED chips positioning system based on the characteristics of the system is constructed. And then, an error analysis method based on Monte Carlo is proposed, which is able to obtain the impact factors of various sources of error, such as calibration error, image processing error and motion control error. By analyzing the influence factors of these error sources, we can know that calibration error is the main source of error affecting positioning accuracy.
Error Analysis and Experimental Research on 3D Printing
Authors: Zeng Lianghua , Zou Xinfeng
Published: September 2019

Precision is one of the important factors that restrict the application of 3D printing technology on industry. On the basis of Fused Deposition Modeling (FDM) of 3D printing experiments, this paper summarized the problems occurred during experiments, discussed the types of errors of 3D printing, and analyzed the errors by combing theoretical calculation and experiment.
Application of High-resolution Satellite Imagery in Water Quality Monitoring of Rivers and Lakes
Authors: Song Jian , Wang Jiabin
Published: September 2019

The traditional water quality monitoring needs a lot of manpower and financial resources, but with the advantage of high time efficiency and other advantages of high-score data for information extraction, analysis and monitoring can be timely, large-scale monitoring of specific water, make up for the shortcoming of traditional water quality environmental monitoring. This paper introduces the theoretical method and technical process of monitoring surface water body with high score data. First, the original remote sensing data are preprocessed by radiometric calibration, geometric correction, atmospheric correction and water extraction, and then an inversion model is established to invert the chlorophyll a concentration, and then the main monitoring indicators are established, such as suspended matter, transparency and eutrophication index.
PV value-added service pricing model of stand-alone Stackelberg game
Authors: Li Wenfeng , Bai Hongkun , Hua Yuanpeng , Bu Feifei , Han Ding , Yang Meng , Yin Shuo , Wang Yuanyuan , Jia Chuyun
Published: September 2019

With the development of new energy technology, the new-type energy still occupy increasingly larger proportion of the future energy structure, and the development prospect is bright. Under the policy background of further opening the sales side, the concept of PV value-added service is proposed to enhance customer stickiness and gain potential customer of power grid enterprises. In this paper, the pricing model of double photovoltaic value-added service system including three main game participants about the photovoltaic seller, grid company and photovoltaic value-added service consumers as the research subjects, Stackelberg game method is established, put forward the best benefits the pricing method of photovoltaic value-added services. At the same time, the actual situation of the Henan photovoltaic park is studied and analyzed. This paper establishes the Stackelberg double-deck game pricing model of ‘spontaneous self-use and residual electricity network’ in the region, and determines the optimal pricing in this mode. Finally, two economic evaluation indexes are used to evaluate and summarize the economic benefits of ‘spontaneous self-use and residual electricity network’ service mode.
An analysis research of terrain correction methods considering the slope ranges based on OLI image
Authors: Zhang Ying , Wang Lin , Ai Yunfei , Bai Xuejiao
Published: September 2019

In mountainous terrain, the topographic correction often be used in image pre-processing. Recently, some correction approaches considering slope ranges have been developed to improve topographical effects. The paper explores the C correction and Minnaert methods considering the slope ranges to evaluate if the methods considering slope ranges can effectively reduce the topographic effects. The C model constants and Minnaert constants in different slope range were obtained based on the image samples. Then, the scatterplots were used to evaluate the correction results. The model constants analysis shows that the Minnaert constant has a nonlinear relation with slope. The scatterplots analysis shows that the image reflectance using a single correction constant value has a better correction result. When the slopes are greater than 43 degrees, the Minnaert model considering slope has overcorrected the topographic effects. The study has demonstra-ted the Minnaert correction models considering slope range did not better reduce topographic effects and the method need be improved, especially in the high slope ranges.
Identification on the burned forest area of Qipan Mountain using GF1-WFVsatellite image
Authors: Yu W Y , Ji R P , Feng R , Wu J W , Zhang Y S
Published: September 2019

In this study, GF1-WFV image was used with a spatial resolution of 16 m, which is higher than that of the commonly used MODIS, TM and other medium-high resolution satellites. Combined with the information extraction of pre-disaster forest and the ratio of NDVI in the two-temporal image before and after fire occurrence, the burned area, and its range after the “4.17” fire in Qipan Mountain in 2019 was analyzed. The results showed among the vegetable indices NDVI and EVI were better than GEMI and BAI in the extraction of burned forest area, while the radio of NDVI in two two-temporal was better than that of EVI. By using NDVI to extract forestland information before the fire occurrence and combining with NDVI ratio, it was most suitable to identify the burned area after a large range of forest fire in this area, with an overall accuracy of 92.2%.
Study on Residential Fire Load in the Yangtze River Delta
Authors: Wang Yueqiang , Zhou Jin
Published: September 2019

Fire load survey is an important step in residential fire risk assessment. There are certain differences in residential fire loads in different regions. In order to improve the basic fire data in the Yangtze River Delta, we mainly investigated the residential fire loads in Zhejiang Province. In this survey, the residential fire loads were divided into 7 categories according to the characteristics of combustibles in the room. The measurements include mass method, single item method, size method and area method, etc. The survey data were analyzed by SPSS and residential fire loads were obtained as: 355.75MJ/m2 for living room, 612.28MJ/m2 for bedroom, 658.64MJ/m2 for kitchen, 542.66MJ/m2 for study and 219.64MJ/m2 for bathroom. The statistical analysis shows that the distribution characteristics of residential fire loads are closely related to room use. The fire loads of bedroom and kitchen are basically normal distribution and other rooms are not obvious.
Low-carbon Technology Application in Wuhan Based on Ground Source Heat Pump System
Authors: Li Hongmin , Zou Zuxu
Published: September 2019

It is known that ground source heat pump system (GSHPS) takes the advantage of shallow geothermal energy which include the power of underground water, surface water or soil etc., and the system can not only provide heat apply but also provide cold making power in a high efficiency and energy saving way. The ground source heat pump only uses the shallow geothermal resources of the earth’s surface (usually less than 400 meters deep) as cold and heat source, it takes less effect on earth and its environment. The GSHPS could replace air-conditioner heater and domestic hot water facilities. The running process of GSHPS is green without any pollution. It can be built in a residential area, no burning, no smoke, no waste, no stacking fuel waste sites, and no long-distance transport of heat. The system does not consume water or pollute water, no boiler, no cooling towers, does not need stacked fuel waste sites. It leads significant environmental benefits. With the experimental application in the project in Wuhan, it showed the advantages of GSHPS, the using feasibility of GSHPS and also the disadvantages and limitations of GSHPS. And with the developing of the GSHPS technology, the use of the system can have a considerable prospect.
Measurement and Analysis of Winter Microclimate of Waterfront Settlements in Severe Cold Region
Authors: Zhang Yongyi , Xu Jiejing
Published: September 2019

To study the characteristics of winter microclimate environment of waterfront settlements in severe cold region, relative humidity, wind speed and air temperature of waterfront settlements in Daqing were measured during typical weather day in winter. The outdoor microclimate environment of each site was quantitatively analyzed, and the outdoor microclimate environment of waterfront settlements evaluated by calculating the wind chill temperature (WCT) of each section. The results showed that solar radiation and air temperature have significant influence on the relative humidity in waterfront settlements. The flexible layout of buildings could reduce the adverse effects of wind of severe cold regions in waterfront settlements. Total solar radiation and wind speed led to the difference in air temperature in different areas. The cold degree between the building gable walls was the highest, and the thermal comfort was the worst. The cold degree of enclosed building layout was the lowest, and the thermal comfort was the best.
Research on sequence division and Sedimentary characteristics of Shahezi formation in Xu Dong of Xujiaweizi fault depression
Authors: Di Jiaxiang , Zhang Yuanchang
Published: September 2019

In view of the unclear division of sequence stratigraphy and the unclear understanding of sedimentary characteristics of Shahezi Formation in Xu Dong of Xujiaweizi fault depression, a detailed study on the division of sequence stratigraphy of Shahezi Formation in Xu Dong area of Xujiaweizi fault depression was carried out by using the data of Vail sequence stratigraphy. The sedimentary facies types and plane distribution characteristics of Xu Dong area were analyzed in combination with single well facies and material source supply, etc. The study showed that Shahezi Formation in Xu Dong area could be divided into a second-order sequence, and the interior could be further divided into four third-order sequences. At the early stage of sedimentation, the lake water was relatively deep and fan delta sedimentary system was mainly developed. In the middle period, the lake basin became wider and fan delta and braided river delta sedimentary systems developed. In the late period, the lake basin was basically stable and braided river delta sedimentary system was developed.
Dust concentration estimation of underground working face based on dark channel prior
Authors: Liu Dandan , Ma Quan , Li Dewen , Wang Jie , Liu Heng
Published: September 2019

In this paper, combined with video monitoring system for each working face under the mine, distance measurement system under the mine and Matlab software, real-time monitoring, analysis and calculation of dust concentration under the mine are carried out. Firstly, the image of dust degradation was obtained according to the video monitoring system in the underground dust environment, and the transmission chart with block effect was obtained. Secondly, the obtained transmission figure is processed by Matlab to obtain the corresponding transmission of each pixel in the dust image. Then according to the dust dispersion measurement system to calculate the extinction coefficient, according to the distance measurement system measured the length of the radiation channel distance;Finally, according to the established dust image degradation model, the dust concentration change process and dust mass concentration at each moment and point can be obtained from the extinction coefficient, transmission rate and length of radiation channel. The research method in this paper is rapid and can be used for real-time and online continuous detection, so as to obtain the dust mass concentration and dust distribution in the dust environment.
Experimental study on sedimentation characteristics of fine tailings
Authors: Li Quanming , Liu Yinkun , Zhang Hong
Published: September 2019

The experimental results of sedimentation characteristics of fine-grained tailing at home and abroad are summarized. For fine-grained tailing dam, the particle size of tailing, the discharge concentration of tailing and pore water pressure has significant effects on the sedimentation characteristics of fine-grained tailing dam. Different particle size of tailing will lead to a different structure of tailing deposition, which directly affects the sedimentation characteristics and stability of tailing. The increase of discharge concentration and pore water pressure will also lead to adverse results of tailing sedimentation characteristics.
Study on the Impact of Carbon Emissions on International Agricultural Trade of Countries Along “the Belt and Road Initiative” with China
Authors: Yang Ju
Published: September 2019

The main aim of this study is to investigate the impact of carbon emissions on international agricultural trade. To address this, a stochastic frontier specification of the gravity model is adopted to examine the driving forces of the change in agricultural import and export between 48 countries of 5 regions along “the Belt and Road Initiative” and China with an emphasis on carbon emissions. Based on the findings of the paper, we can draw the following conclusion, first, there is a positive influence of carbon emissions in international agricultural trade. Second, the situation varies among the five regions.
Karst Development Models of Early Plaeozoic Carbonate Rocks on the Southern Margin of North China Platform
Authors: Sun Fengying , Tang Wenfeng
Published: September 2019

This paper analyzes the formation and karst development process of early paleozoic carbonate rocks in the southern margin of North China platform from the aspects of regional stratigraphy distribution, crustal movement and evolution and groundwater recharge and drainage conditions. It is concluded that the karst in the study area is multi-level developed and affected by lithology. Under the control of tectonic movement and groundwater flow, there are three main types of karst development models: bedding karst, water erosive karst, fault zone karst and erosive mining karst.
Design and Implementation of Yunnan Province Soil Environmental Quality Database Based on ArcSDE for Oracle
Authors: Zhao Yi , Liang Hong , Zhou Ningshan , Zhao Juan , Zhang Yuxia , Peng Yinxia
Published: September 2019

The environmental quality monitoring work in Yunnan Province began in the 1970s. After 40 years of development, the Yunnan Province Environmental Monitoring System was initially established. However, the soil environmental monitoring data of the province lacks a unified warehousing standard, and a spatial database of soil environmental quality has not been established to integrate and standardize the data. Based on the research and reference to the relevant standards of soil database construction method and management at home and abroad, GeoDatabase is used as the spatial data model, and the conceptual model, logical organization model and storage model of Yunnan Province soil environmental quality database are designed by using Oracle and ArcSDE technologies. In order to accurately reflect the spatial location of the soil sampling points and the characteristic properties of the samples, and to ensure the uniqueness and rationality of the primary key in the data table, this paper designs the coding of the soil environmental quality database. The construction of soil environmental quality database in Yunnan Province realized the seamless integration of spatial data and attribute data, and provided comprehensive and accurate basic data and scientific decision support for soil pollution prevention and soil ecological restoration in Yunnan Province.
Research of the pollution characteristics of PAHs in air particulate pollutants
Authors: Ma Tongyu , Chu Yiwei , Zhang Bo , Liu Nannan
Published: September 2019

Polycyclic aromatic hydrocarbons (PAHs) and particulate matter (PM) exhibit a slightly positive correlation. Results showed that PAHs and PM2.5 occurred in the following order of areas: urban > suburban > rural. The light-ring PAHs accounted for higher percentage than the heavy-ring ones in PM2.5. Coal burning, human activities, and industrial pollutants were major sources of PAHs in the urban area according to the ratio of specific toxic PAH compounds. Traffic release and coal burning were predominant integrative sources in suburban areas. In rural areas, the contribution of PAH pollution may originate from coal burning and human activities as the result of long-range transportation from urban and suburban areas.
Characterization of carbonized waste materials: Rice husk and saw dust
Authors: Melvin G J H , Chai Kah Fei , Tamiri Fadzlita Mohd
Published: September 2019

Waste materials can be categorized into household, commercial, agricultural, synthetic wastes, and so on. Agricultural wastes play a great role as an alternative material to be derived into valuable carbon materials, due to their low cost and abundancy, in contrast to conventional carbon material sources. Feasible carbonization process of agricultural wastes can be conducted by using heat treatment. The focused agricultural wastes in this study are rice husks (RH) and saw dusts (SD). They are converted into carbon materials through heat treatment under the presence of inert gas at 500°C and 800°C for 2 hours. Then, their characteristics such as structure, morphology, elemental composition, and crystallinity are investigated by utilizing scanning electron microscopy (SEM), Energy Dispersive X-ray (EDX) spectroscopy, and X-ray Diffraction (XRD). Similarly, the carbonized RHs and SDs can be classified as amorphous carbon and possess porous structure. The characteristics of carbonized RHs and SDs indicate that they could be a promising material to be utilized in particular or various applications.