bluuebunny/crossref_metadata_2025 huggingface dataset:
The research on the classification method of high water-cut well group in Y block
Authors: Xiaoyuan Yu
Published: October 2020

Y block has entered the ultra-high water cut stage of production, and the water cut of oil wells is generally higher than 90%. Before polymer flooding, water cut continues to rise. High-water-bearing wells in the injected area are characterized by difficulty in effectiveness and low water cut decline, which seriously affects the overall development effect of the area. In this paper, the high water-bearing wells are divided into four categories by the parameter index of the number of layers in the high water-bearing channels before polymer flooding.Through the splitstream curve and the phase permeability curve, the permeability and oil saturation data under the condition of 98% water content were selected for fitting, and the critical oil saturation formula was obtained.The ratio between the oil saturation and the critical oil saturation is calculated by numerical simulation, and the discriminant standard of the dominant seepage channel with high water content is established.Compared with previous remaining oil saturation field identification methods, changed the method according to the conventional ideas of remaining oil saturation evaluation of water and residual oil, through the analysis of reservoir permeability parameters for the current development under the condition of the target reservoir quantitative identification of the cause of high water cut, to cause high containing water wells and reservoir high water cut oilfield management work provide quantitative analysis and objective guidance.
Short-term Forecast of Multiple Loads in Integrated Energy System Based on IPSO-WNN
Authors: Yuwei Cao , Ming Zeng , Shigong Jiang , Weihong Yang , Pengjia Shi , Xiaopeng Guo
Published: October 2020

Accurate short-term energy load forecasting has a considerable influence on the economic scheduling and optimal operation of integrated energy system. This study proposes an improved particle swarm optimization-wavelet neural network (IPSO-WNN) method for short-term load forecasting of integrated energy system. First, Kendall rank correlation coefficient in Copula theory is used to analyze the correlation among the influencing factors, through which the influencing factors with strong correlation are selected as input variables of the model. Secondly, chaos algorithm and adaptive weight selection strategy are introduced in the POS-WNN forecasting model to improve the prediction accuracy. Therefore, a short-term load forecasting model of integrated energy system based on IPSO-WNN is established. Finally, the analysis of examples shows that the load prediction accuracy is significantly improved based on the IPSO-WNN model compared with the traditional forecasting model.
Research and Development of Ship Waste Heat Driven S-CO2 Power Generation Coupled T-CO2 Refrigeration System
Authors: Li Min , Zhang Yongqian , Wu Youjian , Chen Ruitao , Zhang Qianxi , Ling Changming
Published: October 2020

Most of the exhaust temperature of ships is above 300℃, usually this part of waste heat would be directly discharged into the environment, not fully utilized. In order to improve the energy efficiency ratio of ship storage and transportation more effectively, domestic and foreign counterparts have done a lot of technical research on the recovery and utilization of ship waste heat, but most of them are based on a single application perspective. Emphasizing the application of multi-angle combined waste heat, driven by waste heat for CO2 supercritical power generation coupling trans-critical refrigeration system was proposed and designed. While the combined system recovered waste heat for power generation, the functions of refrigerating cooling and seawater desalination were realized by using the properties of CO2 working medium. Taking Fuyuan Yu 7861 ocean-going fishing boat as a design case, the relevant thermal calculation and equipment matching of CO2 supercritical power-transcritical refrigeration system driven by waste heat recovery were targeted. The results showed that the total power consumption of the system is 34.171KW, the waste heat power generation efficiency is 12.9%, the refrigeration performance coefficient is 2.368, the energy saving effect is remarkable, and the energy saving and emission reduction are realized.
Study on hydrocyclone used for natural gas hydrate mining
Authors: Ti Wangqiang , Chang Yulong , Wang Hualin
Published: October 2020

Nowadays, energy shortages and global environmental pollution problems are becoming increasingly prominent, and the exploration of clean and renewable energy has become an important direction of energy research. Natural gas hydrates have become the most promising alternative energy source in the future due to its advantages of high calorific value, small environmental hazards and abundant mineral deposits. About 99% of natural gas hydrates are stored in the seabed formation. In 2014, China proposed solid-state fluidized mining technology for marine natural gas hydrates. One of its key technologies is to remove sand from hydrates in real time and backfill the sand on the seabed. Therefore, a downhole axial hydrocyclone suitable for the exploitation of marine natural gas hydrates is proposed in this paper. The purpose of this study is to achieve real-time sand removal and backfilling of downhole hydrate mixed slurry, reduce the sand content of produced fluid, protect the seabed stratum structure, and at the same time reduce the energy consumption of pipeline transportation. In this study, the experimental method was used to evaluate the separation performance of the cyclone with a nominal diameter of 100 mm under different working conditions.
The Development and Tendency of Current Off-Shore Wind Power Plant All over the World
Authors: Wang Zekun , Zhang Fuxi
Published: October 2020

Based on the analysis of the new and accumulated offshore wind power installed capacity and wind farm and distribution in 2010-2019, this paper focuses on the prediction and comprehensive analysis of the scale of offshore wind power construction and approval in coastal provinces and cities by the end of 2019 and the projected grid-connected scale, current industrial status, and technical advantages and disadvantages in 2022-2025. The future technology development trend is forecasted, and the relevant policy recommendations are put forward.
Comparison of Gaseous Emissions from Stored Biomass Residues
Authors: He Xiao , Wang Lianjun , Lau Anthony
Published: October 2020

Woody biomass used as alternative fuel to generate power becomes a significant element of sustainability nowadays. Biomass is usually stored for some period before direct combustion or processing in biorefineries. The objective of this study is to quantify and compare the gas emissions from Western Red Cedar (WRC) and Douglas fir (DF) chips during storage at a range of temperatures (5-50oC) under both non-aerobic and aerobic conditions. Results showed that the dominant mechanism is different depending on the stored materials. Emissions of CO and CH4 were 2-5 orders of magnitude less than CO2 emission for both WRC and DF chips. The major components of VOCs detected by GC/MS from both materials are similar, consisting of hydrocarbons, aldehyde, terpenes, methanol, acetone, ketone, acid and esters, benzene and its derivatives. The total concentrations of VOC (TVOC) under both conditions differed with temperature, and they were much higher from the DF chips than WRC. The emission factors under the aerobic condition were higher when compared to those under the non-aerobic condition over the storage time period.
International competitiveness and potential for trade cooperation on clean energy between the USA and China
Authors: Dong Yaowu , Li Xuesong , Wu Jie , Liu Yaoyao
Published: October 2020

As two super powers in energy consumption and carbon emission, the United States and China have been striving to develop clean energy in recent years. In this paper, we study the international competitiveness and potential for trade cooperation in clean energy between the two countries. This paper reveals that the United States has comparative advantages in terms of biomass energy and nuclear power, while China has comparative advantages in terms of solar energy and wind energy. The two countries have a strong complementarity in solar energy, biomass energy and nuclear energy with exporting from the United States and importing from China. In solar energy and wind energy a strong complementarity has been formed with exporting from China and importing into the United States. So the two countries have a strong potential for cooperation. Meanwhile, the potential trade cooperation is enhancing with the United States accelerating the development and exportation in natural gas. Therefore, the two countries have a strong trade complementarity on clear energy and a strong potential for cooperation in general. At the same time, the VCR model is built based on the clean energy Trade Complementary Index(TCIc and TCIu) between the United States and China. It can be found that the clean energy trade cooperation helps to curb CO2 emissions and promotes the GDP growth in the United States. However, China is in the early stage of clean energy development, the cooperation would cause a decline of GDP in China.
Research on the Development Characteristics of Green Energy Industry in Main Developed Countries
Authors: Xu Chenglei , Zhou Huan , Sun Yonghe
Published: October 2020

Green energy is regarded as the breakthrough of the fourth technological revolution of mankind, which is highly concerned by the whole world. By analysing the development strategies of major developed countries to promote green energy industry, this paper constructs a theoretical framework from four aspects: government policy, green consumption, technology and capital, so as to summarize the typical characteristics of the development of green energy industry. The study found that government policy and technology are the main driving force for the development of green energy industry in major developed countries, the resource-rich United States leads the industrial development with policy, and the European Union obtains new energy development through policy and technological innovation at the same time. Japan continues to innovate and take the lead in technology to break the limitations of innate conditions. The conclusions of the study will help countries with the same resource base, policy environment and consumption concept to sort out the development ideas of green energy, and provide some reference and reference for the formulation of effective development strategies.
Simulation and Economic Analysis of Photovoltaic Rooftop System on the Female Dormitory
Authors: Mongkoldhumrongkul Krittaphas
Published: October 2020

Solar energy is an ordinary type of renewable energy accustomed to produce electricity. However, the photovoltaic system may confront risks and uncertainties for operation. King Mongkut’s University of Technology North Bangkok, Rayong campus (KMUTNB), situated in an area which is suitable for photovoltaic installation, plans to expand their alternative energy proportion. This research focuses on the design and economic feasibility of the photovoltaic rooftop system on the female dormitory. By using the System Advisor Model (SAM) program simulation, the total capacity of the panels is found to be about 198.23 kWp with a total electricity production of about 281.827 MWh per year. The economic results revealed that the photovoltaic rooftop system has the potential to produce electricity at a competitive price. The cost of energy is obtained for 0.1297 USD per kWh throughout the project’s life, meaning that the project would serve as a means of reducing 3,535.7327 tons of carbon dioxide equivalent.
Research on Intelligent Operation and Maintenance Platform Based on Automatic Calibration System of Electric Energy Meter
Authors: Li Rui , Shi Peng-bo , Li Ming-kai , Zhang Yuan , Ding Ning , Wu He
Published: October 2020

To the problem that the operation and maintenance of the electric energy meter automatic verification system is large and the equipment fault location not accurate, a smart operation and maintenance platform is developed. The function and structure of the system are analyzed, and the application effect of the intelligent operation and maintenance platform is demonstrated. The actual operation results show that: The application of intelligent operation and maintenance platform improves the operation and maintenance efficiency of the energy meter automatic verification system, which produces a good economic and social benefits.
The impact of urbanization and financial development on electricity intensity in China: Evidence from panel VAR approach
Authors: Duan Ruijun
Published: October 2020

This paper aims at exploring the impact of urbanization and financial development on electricity intensity in China during the period 2004-2018. By employing a panel vector autoregressive (VAR) approach, the study finds that the electricity intensity response to one standard deviation shock on urbanization shows a negative impact, and a positive shock to financial development initially increases electricity intensity and eventually decreases electricity intensity. Our analysis is important for policy makers for improving electricity efficiency planning and sustainable economic development policies.
Research on Control System of Installation Environment for 500kV Cable Tunnel Joint
Authors: Wang Chuang , Gao Yi , Yang Wenqing
Published: October 2020

The environment in the 500kV cross-linked cable tunnel is bad, which is not conducive to ensuring the joint manufacturing process, and it is easy to cause joint installation defects. A joint installation environmental control system stabilizing the temperature and humidity of the joint installation area and reducing dust particles in the air was designed and developed. A closed space in the joint area was formed by use of sliced inflatable membranes. The integration of refrigeration and air-conditioning technology, air dehumidification technology, air filtration technology and air volume adjustment technology realized temperature, humidity, and cleanliness control of the joint installation area. Stable temperature and humidity, as well as clean air atmosphere can greatly improve the installation quality of high-voltage cable joints in the complex cable tunnel environment, and help reduce the failure rate of joints.
Distributed Control for AC Microgrids with False Data Injection Attacks and Time Delays
Authors: Lu Rentao , Wang Jie
Published: October 2020

Distributed control is widely used in AC microgrids to maintain frequency and voltage stability and internal power balance. However, distributed control need realizes information interaction through communication network, which makes microgrid vulnerable to network attack. A distributed control strategy based on consensus theory is proposed in this paper to enhance the resilience of microgrid to attack. An attack detection and localization method is designed for the false data injection attack. The Artstein’s transformation is introduced to process the delay data and the performance of controller under delay can be enhanced. An isolated island AC microgrid model was built in Simulink platform for simulation to verify the performance of the controller. The simulation results verified the effectiveness of the control strategy against false data injection attack and time delay.
The design of a circulating water pump for a power plant based on CFD
Authors: Chen Wanbo
Published: October 2020

Because of the head and efficiency of the circulating water pump in a power plant could not satisfy application requirement, the guide vane and impeller were optimized according to the CFD method. The optimization of the mixed-flow pump effectively improves the flow state at the design and high discharge conditions. Finally, the CFD results show that the head is improved by 3.49m and the efficiency is improved by 3.16% after the optimization, which has met the use requirements.
Analysis on the Trend of Sewage Treatment Technology Patent in Dalian, China
Authors: Huang Fengying , Cui Yubo , Zhang Wanjun , zhuma Luosang , Zhang Zhongwei
Published: October 2020

The development status and trend of the patents related to sewage treatment technology in Dalian, China in the past decade may affect the future environmental protection industry development. The status quo of patent applications related to wastewater treatment technology was analyzed from the perspectives of application volume, disclosure volume, application organization, type composition of invention and utility model patent products and legal status. The results indicated that the total number of filed patents were 894, and the number of issued patents were 914 in recent ten years, showing an increasing trend for sewage treatment technology in Dalian, China. However, there were distinct differences between the application agencies of invention patents and utility model patents. Most of the invention patents came from universities, with 264 in the top five, and most of the utility model patents came from enterprises, with 134 in the top five. Among the product types, the highest number of patent applications was water, wastewater, or sludge treatment technology, a total of 761. At this point, the two patent directions had the same trend. In the state of law, although the number of applications and disclosures was 470, which was more than 416 actually authorized, it was not difficult to find that sewage treatment industry in Dalian, China was in an increasingly developing stage and the patents actually obtained had higher quality assurance. In conclusion, this essay from the perspective of patent application made a simple explanation the future development of sewage treatment industry and the problems existing in the practical application of sewage treatment technology. Finally, from the perspective of patent application, the paper analyzed the future development of sewage treatment industry and the problems existing in the practical application of sewage treatment technology.
Effect of Solid Bases Catalyst on Conversion of Acrylonitrile into Acrylic Acid by Hydrothermal Reaction
Authors: Yue Chang , Ye Haixia , Yang Xuejun , Wang Ke , Miao Jia , Liu Shiyang , Shen Zheng , Zhang Yalei
Published: October 2020

This study aims at the shortcomings of the current industrial application of acrylonitrile wastewater treatment, using alkali-catalyzed hydrothermal technology to convert acrylonitrile into acrylic acid for achieving resource utilization. In this study, alkali metal, alkaline earth metal hydroxide and composite solid base were used as catalysts to investigate catalytic effects of these solid based on the hydrothermal reaction. The results show when using the alkali and alkaline-earth metal hydroxides as catalysts, the best effect of treatment was KOH and the highest yield of acrylic acid reached 56.60%. It was also found that, among the three kinds of solid base catalysts (Ca-O-Mg, K-O-Al, K-O-Si) adopted with the same mass and various loading capacity, K-O-Si (15%) was the most effective catalyst for the conversion of acrylonitrile, and the highest yield of acrylic acid reached 57.78%. This process provides an environmentally friendly method toward the synthesis of useful acrylic acid from acrylonitrile within a very short time.
Study on the Operation Effect of Constructed Wetland Project for Tailwater Treatment—An Example from a Sewage Plant in Zhejiang Province
Authors: Chen Mengyin , Zeng Weifeng , Wang Guan , Lu Fangchun , Zhang Jinjuan , Ding Jianhua
Published: October 2020

The constructed wetland project of tailwater from an urban sewage plant in central Zhejiang was selected to collect water samples in different seasons, and the samples were tested for chemical oxygen demand (COD), total phosphorus (TP), total nitrogen (TN) and other indicators. The results showed that the operation effect of the constructed wetland project is good when the effluent from the sewage treatment plant meets the Class A discharge standard. Among them, the removal effect of TP was the best, with an average removal rate of 61.52%, reaching the standards of surface water class III and class IV in some tests. Besides, the removal effect of TP was stable and varies little with seasons. The removal rates of COD and TN were relatively low and varied greatly with seasons, which were higher in spring and summer than in autumn and winter, with a negative removal rate of TN in winter. This research provides practical data for optimizing the engineering design parameters and improving the operation management to promote the operation efficiency of the constructed wetland.
Preliminary analysis of geological disaster and water circulation system
Authors: Zhang Yubin
Published: October 2020

China is a country with frequent geological disasters. First of all, the occurrence of geological disaster will cause great loss of life and property. Secondly, disasters cause changes in topography and landforms, which also have an impact on the natural environment. In a sense, the occurrence of geological disasters and the natural environment are mutually affected. The occurrence of geological disasters is closely related to the soil and water environment. The improvement of regional water circulation system can obviously reduce the occurrence of geological disasters. This paper analyzes the causes of geological disasters. This paper introduces the water environment improvement programs in the United States, Britain and China.
Nitrogen-doped graphene-like carbon material derived via a simple, cost-effective method as an excellent adsorbent for methylene blue adsorption
Authors: Ren Bin , Miao Junfeng , Wang Shasha , Xu Yuelong , Zhai Zuozhao , Dong Xiaoxi , Liu Zhenfa
Published: October 2020

Nitrogen-enriched graphene-like carbon materials were successfully prepared via pyrolysis of a mixture of melamine, ammonia chloride (NH4Cl) and polyvinyl pyrrolidone (PVP) at a mild temperature without inert gas protection. Different techniques were used to analyze the physical and chemical properties of the products. All the prepared materials showed excellent performance in methylene blue (MB) adsorption, In particular, the materials prepared with 3 g polyvinyl pyrrolidone (PVP) (NCG-2) exhibited the best performance, a very high maximum adsorption capacity of 348.2 mg/g, much larger than many reported materials. The high adsorption capacity of the Nitrogen-doped graphene-like carbon materials was possible due to its uniform porous structure, high specific surface area. Moreover, NCG-2 could be recycled and only a only slightly decreased in the removal efficiency were observed after 5 cycles.
Influence of O2/C molar ratio and coal feeding rate on sulfur release during CFB gasification
Authors: Xian Shengxian , Jiang Denghao , Fan Yanqi , Zhang Haixia , Chai Zhen , Zhu Zhiping
Published: October 2020

The release behavior of sulfur during coal gasification was studied in a bench-scale self-heated circulating fluidized bed gasifier. With the increase of the O2/C molar ratio, gasification temperature increases, which promotes sulfur release rate and the formation of H2S. The conversion reaction between H2S and COS is far from equilibrium and the yield of COS is excessive. Under the same molar ratio of O2/C, the increase of coal feeding rate can elevate the gasification temperature, promote the release of sulfur and the transformation of gaseous sulfur to H2S.
Optimization of reinjection treatment technology for oilfield wastewater in Longdong area
Authors: Zhu Xiulan , Ran Yanlong , Guo Wenjie , Gai Ke , Li Yanju , Yan Caini , Ding Baobao
Published: October 2020

With the long-term water injection development of Longdong oilfields, most of the oilfield blocks have been fully in the mid-high water cut period, and the amount of oil production wastewater is increasing year by year. In order to prevent the waste of resources and energy of oil production sewage, the oil production sewage after reaching the standard is treated for reinjection, which will ensure the sustainable development of the oil field. Oil production wastewater contains crude oil, solid-phase suspended solids and other pollutants, with high salinity, and problems such as difficulty in oil-water separation, sludge, scaling and corrosion. The sewage treatment system uses a multifunctional water treatment device to effectively remove oil and filter through the “special microorganism + air flotation + filtration” process, and build a sludge sewage tank for sludge discharge and backwashing. The reformed oil recovery wastewater reinjection treatment technology turns “sewage” into “clear flow”, reduces operating costs, improves wastewater treatment efficiency, and meets the water quality requirements of oilfield reinjection water.
Fouling mechanism and control strategy of inorganic membrane
Authors: Li Peng , Zhang Shoubin , Lv Ying , Ma Guoqiang , Zuo Xinyi
Published: October 2020

Compared with the traditional treatment technologies, inorganic membrane technology is gradually becoming the mainstream of the treatment of oily and salty wastewater, but membrane fouling has become the bottleneck restricting the development of membrane technology. In order to solve this problem, the mechanism of membrane fouling and the control strategies of membrane fouling are introduced in this paper. The atomic layer deposition technology and the preparation of TiO2 nanowires (NWs) film by impregnation method were mainly introduced, aiming to provide a more reliable industrial research status in the field of membrane fouling control.
Carbon emission assessment of wastewater treatment plant based on accounting perspective
Authors: Lin Lin
Published: October 2020

Excessive GHG emissions from human activities lead to climate warming, and sewage treatment plants are one of the sources of GHG emissions. The number of sewage treatment plants in my country is increasing year by year, and they emit a large amount of GHG, it is necessary to evaluate their emissions and seek ways to reduce emissions. According to the “Greenhouse Gas Inventory Protocol-Corporate Accounting and Reporting Standards”, taking a sewage treatment plant in a northern city as an example, the GHG emission classification of its operation control range, selection of evaluation methods and emission factors, assessment of GHG emissions, analysis of GHG emissions Constitution, propose ecological treatment technology, recycling CH4 and other emission reduction measures.
Seasonal variations of water-soluble ions in PM10 at a WMO/GAW station in the Yangtze River Delta, China
Authors: Fang Dongqing , Jin Junli , Huang Wei , Zhang Yong , Sun Wanqi , Yan Peng , Jing Junshan , Hao Rui
Published: October 2020

In order to understand the seasonal levels, formation mechanism and atmospheric chemical behaviours of water-soluble ions of PM10 in the Yangtze River Delta (YRD) region, aerosol samples were collected from January 2nd to December 28th, 2017 at a WMO/GAW regional background station in Lin’an. The concentrations of PM mass and nine water-soluble inorganic ions were obtained. The annual average concentration of PM10 was 59.9±33.9 μg m−3, lower than those reported in previous studies, indicating air quality of YRD region was improved. Nine water-soluble inorganic ions was accounted for 30.2-45.1% of the total PM mass, while ammonium (NH4+), sulfate (SO42+), as well as nitrate (NO3-) were the major ions which contributed 86.3% to total ions. The NO3- concentration was lowest in summer but highest in winter, suggesting it was likely influenced by thermodynamics. The levels of SO42- in spring and winter were related to photochemical reaction and regional transportation. Except for the SNA, Ca2+ was highest in four seasons likely due to sand storm and road fugitive dust. The annual mean ratio of [NO3-]/[SO42-] was nearly to 1, indicating mobile and stationary sources were equally important in Lin’an. The mean nitrogen oxidation ratio (NOR) and sulfur oxidation ratio (SOR) were 0.22±0.13 and 0.41±0.13, respectively, suggesting secondary formation was significant in the atmosphere at the background station of YRD region.
Characteristics of MERRA-2 Black Carbon in Eight Key Climatic Regions across China from 2007 to 2018
Authors: Zhang Yong , Jin Junli , Li Yanan , Yu Dajiang , Zhou Qing , Gao Lina
Published: October 2020

The spatial distribution, temporal variations and trend changes of surface black carbon concentrations in eight key climatic regions across China were analyzed from 2007 to 2018, based on the Modern-era Retrospective Analysis for Research and Applications Version 2 (MERRA-2) black carbon dataset. The mass concentration of BC in China shows an “East-High and West-Low” pattern, with multi-year averaged BC ranging from 154 ng/m3 to 3857 ng/m3. Pronounced seasonal variations were found, with the highest value in winter and the lowest in summer. Most of regions in central and eastern China share similar diurnal pattern with a single-peak at early morning and a valley at noon. Obvious downward trend in most regions of China were identified from 2007 to 2018, especially in southern central China and southwestern part of eastern China, with the highest decline rate of -8.349 ng/m3 per month, which confirming that the great endeavors and effective enforcement of environmental protection measures implemented in China for the last decade.
Micro-interface temperature field of catalytic particle under self-rotation regulation
Authors: Xu Lei , Wang Hualin , Huang Yuan
Published: October 2020

The micro-interface formed inside and on the surface of the catalytic particle is the place where the catalytic reaction proceeds. The micro-interface temperature is one of the important factors determining the reaction efficiency. Numerical simulation was used to investigate the fluid-solid coupled heat transfer law of micro-interface under the regulation of spherical particles’ self-rotation. The results show it takes up to 4.78 s that the average surface temperature of non-rotating particle with a diameter of 3 mm decreases from 300 ℃ to 150 ℃, which is the lowest temperature required for high-efficiency selective catalytic reduction reaction of NOx with NH3, while self-rotation can reduce the cooling rate of particles. When the direction of particle self-rotation is perpendicular to gas velocity, as the self-rotation speed increases, the high-temperature area of the particle surface diffuses more fully to the latitude direction. Significant effect can be made as the self-rotation speed reaches 5 rad/s, the uniformity of the surface temperature can be increased by 27.1 % ~ 37.7 % compared with non-rotating particle, and the uniformity can be increased by a maximum of 49.5 % at a self-rotation speed of 500 rad/s.
Analysis on the Environmental Eco-efficiency of China’s Green Financial Services Based on DEA-Malmquist Model
Authors: Liu Zhao , Wang Zuogong
Published: October 2020

Based on the development of green finance in provinces in China from 2007 to 2017, this paper makes a study on the environmental ecological efficiency of green financial services. Through the research, we can understand the development of green finance and its role in economic development.
Study on Evaluation System of Green Port Development
Authors: Xu Guo , Dadi Zhao
Published: October 2020

Green ports are sustainable ports that achieve a good balance between environmental protection and economic benefits. With the deepening of the green port construction work, in order to study the green port evaluation system, through a large number of port field research, based on the actual situation of Port in China, the “Green Port Grade Evaluation Standard” (JTS/T105-4-2013) was revised, by means of weight assignment for different types of wharfs, the evaluation system at the level of port group is established to solve the limitation that the original standard can only evaluate specialized wharfs, and to realize the evaluation of large port groups with multiple wharfs. Finally, based on the above evaluation system, a port group is selected to evaluate and verify the integrity and correctness of the evaluation system.
The effects of building layouts and envelope on indoor thermal environment of Hui style traditional buildings in Wuyuan
Authors: Hong Xiaowei , Zhang Guangjin , Zhang Yufeng
Published: October 2020

Indoor thermal environment of Hui style traditional houses is depended on surrounding environments, building layouts and envelope. Quantitative analysis of the effects of building layouts and envelope on indoor thermal environment is of great significance for preventions of traditional houses and design of new archaized houses. A field investigation was conducted on thirty-six traditional houses from nine villages in Wuyuan, and the typical buildings’ layout and envelope were determined. Four traditional buildings in different location in Wuyuan were selected for continual recording. The four buildings with four types of building layouts and envelope were analyzed by using local adaptive thermal comfort model, and the effects of building layouts and envelope of traditional buildings were clearly revealed. The most crucial way to improve indoor thermal environment in Hui style traditional buildings was raising the indoor air temperature.
Preparation and characterization of floating porous graphite carbon monoliths produced from biomass and its application
Authors: Chen Hanyu , Zhang Liangbo , Zhang Baozhong , Duan Peiyu
Published: October 2020

Herein, a new floating porous graphite carbon monolith (FCM) was prepared using the graphite powder and peanut shells as the carbon skeleton and using FAC and sepiolite as the swelling agent. The multi-hierarchical porous FCMs were obtained by two-step acid activation method. The effects of the addition of biomass and phosphoric acid on the physical properties and pore structure of the prepared material were investigated. The FCM was combined with codoped titania to develop a new floating photocatalysts. The results showed an increase in the amount of biomass materials during FCM preparation increased the ratio of mesoporous structure in the products. In addition, a high micropore volume ratio and the strongest adsorption effect were achieved by optimizing the phosphoric acid impregnation ratio. After process optimization, the densities of the prepared FCMs ranged between 0.75 and 0.89 g/cm3, and the specific surface area and diameter range of the large pores of the material were 104.5 m2/g and 3-50 μm, respectively. Moreover, the new floating catalysts displayed the excellent photocatalytic properties and recyclability performance.
Study on the relationship between PM2.5 and the interaction between air pressure and temperture based on GAM model
Authors: Xiao Weiwei , Fan Meixia
Published: October 2020

This paper studies the influence of the interaction of two factors on the important air quality monitoring index PM2.5. Specifically, the GAM model based on the interaction of air pressure and temperature and the PM2.5 value is used to obtain the nonlinear relationship between air pressure, temperature and PM2.5. The GAM model has a high degree of fit, that is, the interaction of air pressure and temperature has a greater impact on the PM2.5 value. Therefore, the interaction between pressure and temperature can be used to predict the response variable PM2.5 accurately. Keywords: GAM model;interaction;PM2.5
Simulation of Arc Plasma Gasification Based on Experimental Conditions
Authors: Cao Yawen , Li Bin , Wang Qin , Zhang Zhihao , Han Xianwei
Published: October 2020

An EPJ process simulation model was set up and verified to simulate the plasma gasification process of the medical wastes. The influence of ER value and SAMR value was simulated based on experimental conditions including material feeding rate, furnace temperature and medical waste properties. Results shows that ER=0.3 is a turning point for medical waste plasma gasification. The required input plasma power and volume flow of combustible constituents in syngas reach the maximum at ER=0.3. The balance of syngas composition and required input plasma power should be overall considered. Results shows that the SAMR value mainly influences the amount of H element and N element in the system at a fixed ER value, thus influencing the proportions of H2 and N2 in monotonous ways. Input plasma power needed and combustible syngas flow increase with the increasing SAMR.
Smoke Insulation Performance with Multi-level Hang Wall in Corridor
Authors: Tian Manli
Published: October 2020

The influence of the height of three-level hang wall on smoke insulation effect was study through simulation. One corridor connected to a room was constructed by computational fluid dynamics (CFD) software, then the smoke and the temperature distribution under different height of three-level hang wall were investigated. The result shows that the three-level hang wall played a good role on smoke insulation and the smoke and heat insulation performs the best when the height of three-level hang wall is 0.9m, 0.7m and 0.5m respectively. However, with the continuous development of the fire, the hang wall will eventually fail under all setting conditions.
Fine description of sedimentary system in Wuerxun Sag of Hailaer Basin
Authors: Yue ZHOU , Geng GAO , Duanyang WANG , Xu YANG
Published: October 2020

Wuerxun depression is one of the depressions with great exploration potential in Hailaer Basin and has submitted large-scale reserves. At present, it has entered the stage of fine exploration, and the exploration object has changed from structural reservoir to lithologic reservoir exploration. The remaining targets are mainly concentrated in the trough and surrounding areas, with strong concealment and difficult to identify. Fine identification of sand bodies, genesis, types and distribution of sedimentary fans are one of the key factors restricting oil and gas exploration. Based on core observation and genetic mechanism, three sedimentary facies models of Braided River Delta, fan delta and sublacustrine fan are established. In this paper, the method of “sequence control, cycle correlation and hierarchical closure” is used to fine characterize the fan delta sedimentary system in this area, which lays a foundation for the study of sedimentary microfacies of subdivision layers, optimization of lithologic reservoir targets and guidance of oil and gas exploration deployment.
Research on The Preference of Seasonal Landscape Based on UGC -- A Case Study of Guilin City
Authors: Fan Yaming , Sun Zhengyang , Liu Hui
Published: October 2020

With the continuous advancement of the construction of beautiful China, plant landscape, as an important tourism resource, has been favoured by the majority of people in recent years, and tourism activities with the theme of seeing flowers and leaves are in full swing all over the country. This paper takes the plant landscape of Guilin as the research object, through the collection and collation of relevant UGC data, studies and discusses the tourist preference of Guilin characteristic plant landscape under the background of big data era, and then puts forward suggestions on the construction and optimization of Guilin plant tourism landscape.
An Empirical Study on Green Investment and Economic Growth in China
Authors: Zhang Xuanjian , Gui Ya
Published: October 2020

China’s economy is changing from high-speed growth to high-quality development. Environmental governance investment is an important measure to promote high-quality economic development. According to the Environmental Kuznets curve, there is an inverted U-shaped relationship between environmental pollution and economic growth. And in the long run, the green investment in environmental governance will certainly promote economic growth; but in the short term, a large amount of money used to control pollution will inevitably have a negative impact on economic growth. Based on empirical analysis, this paper studies the relationship between environmental governance investment and economic growth in China. The conclusion shows that there is a positive correlation between environmental governance investment and economic growth in China at this stage, and based on this, some suggestions are put forward.
Facile preparation of BCN nanofibers with tunable band gaps
Authors: Hu Tianjiao , Yu Junying , Zhang Ye
Published: October 2020

As a new synthetic metal-free material, BCN has aroused great interests in the field of photocatalyst materials due to its lower cost as well as higher reliability and better sustainability. In this work, we prepared BCN nanofibers by electrospinning of precursor solution containing polyacrylonitrile and ammonia borane, and then pyrolyzed the polymer fibers in NH3. Infrared spectroscopy (FT-IR), Scanning emission microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) were used to analyse the composition and structure of the samples. The results show that the BCN nanofibers have an average diameter of 50-100 nm and mainly compose of BN nanocrystals. C atoms are distributed at the BN grain boundary in terms of B-C and B-N bonds. The band gap of the fibers is between 2.1-2.7 eV and can be adjusted by changing the ratio of PAN and AB in the raw materials.
Modeling multiphase flow with a hybrid model based on the Pore-network and the lattice Boltzmann method
Authors: Puig Montellà Eduard , Yuan Chao , Chareyre Bruno , Gens Antonio
Published: October 2020

Lattice Boltzmann method (LBM) simulations provide an excellent description of two-phase flow through porous media. However, such simulations require a significant computation time. In order to optimize the computation resources, we propose a hybrid model that combines the efficiency of the pore-network approach and the accuracy of the lattice Boltzmann method at the pore scale. The hybrid model is based on the decomposition of the granular assembly into small subsets, in which LBM simulations are performed to determine the main hydrostatic properties (entry capillary pressure, capillary pressure - liquid content relationship and liquid morphology for each pore throat). A primary drainage of a random packing of spheres is presented and contrasted to the results of the same problem fully resolved by the LBM. Liquid morphology and invasion paths are correctly reproduced by the hybrid method.
BIOCHAR FOR THE IMPROVEMENT OF SOIL AND ROCK WITH ACID POTENTIAL
Authors: Sørmo Erlend , Kämäräinen Erika , Edvardsson Matilda , Maurice Christian
Published: October 2020

Biochar is a carbonaceous material generated by the heating of organic matter under limited access to oxygen (called pyrolysis). While pyrolysis is applied to dry feed, hydrothermal carbonization can be used for wet materials such as sludge. Application of biochar to soil is considered inherent climate friendly since biochar remain stable in the soil for a long time, and thus removing carbon from the short-term carbon cycle. Biochar has the ability to adsorb trace elements and raise pH, when added to soil or/and water. Geomaterials, both soil and rock, containing sulphur in the form of sulphide minerals have the potential to harm the environment. Lowering groundwater in sulphide rich soils and disposal of excavated sulphide rich soil and rock in piles are example of situations where measures have to be taken to mitigate the formation of acid leachate. This presentation aims at presenting the results from two studies where biochar’s capacity to adsorb trace elements is investigated. In the first study, the adsorption capacity of several biochars was compared with leachate generated from the oxidation of sulphide soil, showing a significant decrease of the concentration of elements such as copper and zinc. In the second study, the ability of waste timber biochar to stabilize the leaching from sulphide rich gneisses containing readily soluble, oxidized secondary mineral crusts was investigated. Preliminary results show that the acidity of the oxidized gneisses exceeds the buffer capacity of the biochars, resulting in an acidic, metal rich leachate. Rather reducing metal leaching through sorption and pH control, metals from the biochar matrix are released, resulting in an increased release of metals compared to the control.
Application of deep learning methods to predict ionosphere parameters in real time
Authors: Mochalov Vladimir , Mochalova Anastasia
Published: October 2020

In this paper, the previously obtained results on recognition of ionograms using deep learning are expanded to predict the parameters of the ionosphere. After the ionospheric parameters have been identified on the ionogram using deep learning in real time, we can predict the parameters for some time ahead on the basis of the new data obtained Examples of predicting the ionosphere parameters using an artificial recurrent neural network architecture long short-term memory are given. The place of the block for predicting the parameters of the ionosphere in the system for analyzing ionospheric data using deep learning methods is shown.
Regression analysis of ionospheric disturbance factors
Authors: Polozov Yuryi , Mandrikova Oksana
Published: October 2020

Investigation of interactions of the near-planet space parameters, Earth magnetic field and ionospheric parameters are of interest in the tasks of solar-terrestrial physics and applied researches related to space weather. Ionosphere is one of the important factors of space weather. Functioning of modern ground- and satellite-based engineering facilities depends much on its state. The paper makes a statistical estimate and analyzes complex effect from interplanetary magnetic field parameters, solar radiation and geomagnetic data on ionospheric disturbance development. Ionospheric disturbances were estimated on the basis of the method developed by the authors. The method applies wavelet transform and adaptive thresholds. The most significant factors of ionospheric disturbance occurrences were detected during the investigation and their significance was evaluated.
Passively Q-switched Yb-doped fiber laser based on Ag nanoplates saturable absorber
Authors: Wang Pan , Scardaci Vittorio
Published: October 2020

We experimentally investigated Ag nanoplates as saturable absorber for Q-switched pulse generation in an Yb-doped fiber laser. The pulse train repetition rate increases with the increase of the pump power. At the maximum pump power of 600 mW, the maximum repetition rate and average output power are 184.8 kHz and 10.77 mW, respectively, corresponding to single pulse energy of 58.3 nJ. To the best of our knowledge, it is the first demonstration of the passively Q-switched fiber laser utilizing the material of Ag nanoparticles at the wavelength of 1-μm. Our investigations demonstrate the flexibility of our solution-processed Ag nanoplates-based saturable absorber, making it a promising candidate for a variety of stable and low-cost ultrafast lasers.
Introduction to the Proceedings of “Complexity-disorder” days
Authors: Lévy Jean-Claude Serge
Published: October 2020

The common use of several disciplines for the realization of practical purposes and their usual coworking favour such meetings involving different disciplines. Some old and recent successful examples of effective interferences between different disciplines are reported in order to evidence the potential fruitfulness of this process. The theme complexity and disorder are shown to be a central point of convergence between disciplines shown from the observation of past and future projects.