bluuebunny/crossref_metadata_2025 huggingface dataset:
Synthesis of Guar Gum Stabilized Nanoscale Zero-valent Iron for Cr (VI) Removal in Water
Authors: Wei Liu , Tielong Li , Fangchun Lu , Jinjuan Zhang
Published: February 2021

Guar gum was used in the preparation of a new stabilized nanoscale zero-valent iron (nZVI), as a biodegradation stabilizer. The TEM results showed that the nanoparticles were coated by guar gum, and average particle size was 87.4 nm; XRD results showed that guar gum stabilized nZVI was α-nanoFe0. The batch test results showed that the degradation rate of guar gum stabilized nZVI was 12 times than 200 mesh reduced iron powder. Guar gum could hinder the formation of Fe(III)-Cr(III) precipitate by chelating Fe(III), consequently enhanced the reduction of Cr(VI) to Cr(III).
Diagnosis of Post-Arc Residual Plasma in Vacuum Breaker
Authors: Bohao Zhang
Published: February 2021

The residual plasma in the gap between the anode and cathode has an important influence on the recovery characteristics of the medium after the arc current zero in the vacuum arc extinguishing chamber. A diagnostic system for post-arc residual plasma is proposed and designed to diagnose the density of residual plasma during sheath expansion. The experimental platform is built on the basis of the synthetic circuit and detachable vacuum chamber. The diagnostic system uses Langmuir probe array to diagnose the post-arc plasma density change in vacuum interrupter, which reflects the dynamic process of sheath expansion in the gap. The effect of different current sizes and contact spacing on residual plasma is discussed in this paper. The plasma densities diagnosed by different position probes are used to analyze the post-arc characteristics of vacuum circuit breakers from a micro-level. The accuracy and reliability of the diagnostic system are verified by comparing with the previous studies, which provides some reference value for the future research on the post-arc micro-characteristics of vacuum breaker.
Transfering heat performance for controlling the spontaneous combustion in coalfield of heat pipe
Authors: Zhang Ya-ping , Jiang Hao-chen , Hao Haohao , Qu Fangfang , He Zhiyin , Quan Xin
Published: February 2021

A heat pipe coal pile experiment platform was established to test the performance of the heat pipe in the heat transfer of the coal pile. Experiments were carried out to measure and analyze the continuous cooling characteristics and cooling rate of the internal heat dissipation of coal piles of different heights under different temperature heat sources. The results show that when the heat source temperature is higher, there is a greater cooling rate inside the coal pile. The closer it is to the heat source, the more obvious the heat dissipation inside the coal pile will be affected by the heat pipe and heat source. This experiment verifies the feasibility of the heat pipe to automatically and continuously transfers the internal heat of the coal pile under the action of the difference between the outside temperature and the internal temperature of the coal pile, to achieve the purpose of preventing spontaneous combustion of the coal pile.
Effect of biogas slurry on water footprint in cauliflower production
Authors: Zhichao Zhao , Shifeng Zhao , Yanqin Wang , Longyun Fu , li Yao
Published: February 2021

We conducted a field experiment consisting of five treatments during topdressing (CK: no N input, CON: farmer’s conventional N fertilizer input, HBS: substitution of half the amount of N fertilizer with vegetable waste biogas slurry, BS: substitution of the total amount of N fertilizer with vegetable waste biogas slurry, and DBS: substitution of double the amount of N fertilizer with vegetable waste biogas slurry) to evaluate the effect of biogas slurry topdressing on the water footprint (WF) of cauliflower. The results showed that The WF of cauliflower production with the BS treatment was the lowest, which was 18%, 15%, 34%, and 52% lower than that with the DBS, HBS, CON and CK treatments, respectively. The main water consumption sources were blue water consumption via irrigation and grey water consumption, and they accounted for 93%~98% of the total water consumption. Considering the increased cauliflower yield, the substitution of fertilizer N with equal amount of vegetable waste biogas slurry during topdressing in the production of cauliflower is recommended in northern China. Water footprint can be reduced by reducing irrigation and nitrogen leaching.
Membrane fouling of actual extracellular polymeric substances
Authors: Li Qiang , Hu Ge , Song Peng , Khaliunaa Natsagdorj , Khurram Rooha , Zhang Hu , Liu Xuguo , Wang Zhan , Gao Shujuan , Liu Chao , Wang Xi
Published: February 2021

Extracellular polymeric substances (EPSs) in activated sludge suspensions are the key substances leading to the membrane fouling. In order to understand the effect of EPSs on the membrane fouling, the actual EPSs solution extracted from activated sludge suspensions was used as the feed solution to conduct dead-end microfiltration experiment under different pressures by using different membranes. The flux (J), fouling resistances (Rm, Rp, Rc
and Rtotal
) and the available membrane area (A/A0
) were used to describe the membrane fouling. The results showed that with the increase of pressure, J and Rtotal
increased. Rp
firstly increased and then kept constant, Rc
always increased and became the dominant resistance. A/A0
decreased from 1 to a constant. Rc
plays a key role on Rtotal
for different membranes under the same pressure. The sequence of the steady available membrane area (A
steady/A0
) for different pressures was: 63.0% (0.05MPa)> 56.5% (0.08MPa)> 53.6% (0.10MPa), and that for different membranes was: 80.1% (0.2μm PES) > 79.9% (0.1μm PES) > 78.4% (0.1μm PAN) > 53.6% (0.1μm PVDF).
Research on Balanced Management Topology of Series Battery Pack
Authors: Fu Rifucairen , Huo Qunhai
Published: February 2021

With the rapid development of renewable energy, energy storage battery technology has made great progress, and it has also caused the rapid development of electric vehicles. There is an inevitable difference between a large number of battery cells in the energy storage battery pack of electric vehicles. This difference will increase with time, and ultimately affect the safe operation of electric vehicles. Aiming at the problem of voltage imbalance in series battery packs, an improved balanced topology based on energy storage inductors is proposed. The basic working principle of the active balanced topology is analyzed, and the charging and discharging process of the balanced topology is theoretically derived. Finally, the simulation model of the balanced control during the charging and discharging process of the battery pack is built using MATLAB/Simulink. The simulation results show that the battery pack has a good balance effect during charging and discharging, which can provide an effective solution to the balance problem of series battery packs.
Study on the mechanical characteristics of steel truss cable-stayed bridge with water pipeline
Authors: Li Ranran , Wang Xiaoshan , Zhang Yajun , Xue Yuxin
Published: February 2021

Based on the engineering background of a water pipeline cable-stayed bridge, the static characteristics, dynamic behavior and stability of the bridge were studied through the finite element numerical simulation. In terms of static characteristics, the mechanical characteristics of each member of the main truss were analyzed. In the aspect of dynamic characteristics and stability, the influence of different connection modes of pipes and main beam on the dynamic characteristics and stability of the structure was compared. The results show that compared with the bridge used for traffic, the special pipeline bridge bears much more load, and its safety should be paid more attention to. Due to the direct action of the pipeline, the cross beam of the steel truss is the weakest member, which should be paid attention to in the design. When the rigid connection is adopted between the pipeline and the main beam, the lateral rigidity of the structure is larger and the stability is better. It is suggested that the rigid connection should be adopted between the pipeline and the main beam in the design of this kind of bridge to ensure that they can bear the load together.
Influence of temperature and pressure change on CO2 foaming characteristics in crude oil
Authors: Zhang Shuhao , Hongtao Ma , Li Yuxing
Published: February 2021

CO2 flooding is an effective technology to improve oil recovery. However, because the foam layer produced in the actual production may affect the gas-liquid separation effect, a set of equipment for analyzing the foaming behavior of dissolved gas crude oil by using the depressurization method is designed, to record the generation and decaying process of foam. The effects of depressurization method, depressurization rate, initial pressure and temperature on the foaming process of crude oil are studied. Studies showed that the use of stepwise depressurization and low depressurization rate is beneficial to increase the effect of gas-liquid separation. There is an optimal temperature to maximize the separation effect.
Research on bearing jacking method of steel -concrete composite beam bridge
Authors: Liu Jinxin , Ma Xiaowei , Zhang Xin
Published: February 2021

There are plenty of advantages of steel-concrete composite beam bridges. However, Transverse cracks in composite girder bridges usually appear because of the tensile stresses in the concrete deck induced by the negative bending moment at the intermediate supports of continuous composite girder bridges. There are many measures to reduce the tensile stress in the negative bending moment zone of steel-concrete composite beams. At present, bearing jacking method is used more and more in engineering. Taking a composite beam in Shaanxi province as an example, this paper studies the influence of jacking amount and span number on the improvement effect of bearing jacking method. The improvement of stress level of concrete deck in negative moment zone of steel-concrete composite beam bridge is studied and analysed which puts forward relevant engineering solution.
Equilibrium strategy of economic cost and carbon emission reduction of green electric-coal supply chain
Authors: Zhang Liming , Chen Xuewu , Yang Wei , Xiao Gang , Zhao Siwei
Published: February 2021

As the government pays more attention to energy conservation and emission reduction in the energy industry, the contradiction between economic cost and carbon emission reduction in the electric-coal supply chain becomes more and more serious, which needs to be solved urgently. Therefore, based on the theory of green supply chain, this research constructs a dynamic multi-objective model under the uncertain decision-making environment with the realization of the equilibrium of the total economic cost and carbon emission of electric-coal supply chain as the decision goal, and taking the coal supply capacity and and other practical requirements as the constraints. The following equilibrium model is applied to a electric-coal supply chain in the southwestern region of Y Province. With full consideration of different carbon emission reduction scenarios, the total economic cost and carbon emission balance plan of electric-coal supply chain under five different emission reduction scenarios were obtained, which verified the practicability and effectiveness of the equilibrium model. The results show that the equilibrium model can effectively alleviate the conflict between the economic cost and carbon emission reduction. Finally, based on data analysis, we put forward management suggestions from macro, meso and micro levels to better realize the greenization of electric-coal supply chain.
Research on the Impact of Policies under the Bayesian Network Model on the Consumption Behavior of New Energy Vehicles
Authors: Li JiaHui , Liu Qin
Published: February 2021

Based on the Bayesian network, this paper uses consumer models to extract several factors that affect the consumption behavior of new energy vehicles, and combines principal component analysis to extract the main factors to construct the model. Using the past sales changes of various models under various policy environments, this paper assign probabilities to the model, and use genetic algorithms to find the value of each factor when the predicted value of new energy vehicle sales growth is the highest. Through correlation analysis, the relevant information of each factor is analyzed, and it is concluded that subsidies have a greater impact on the consumption of new energy vehicles. In the car itself, people pay more attention to the durability of the battery than the performance of the car. Combining the predicted value of the model with the current policy background, it puts forward recommendations on loans, batteries, environmental awareness, and charging infrastructure for new energy vehicle policies.
Free surface flow over two-dimensional dunes under different flow regimes
Authors: Zhao Chenwei
Published: February 2021

To explore the influence of different flow regimes on fluid dynamics over dunes after the construction of the Three Gorges Dam, a model is applied by utilizing a large eddy simulation, immersed boundary method and level set method to address the turbulence, dune morphology and free water surface, respectively. Seven simulations with incrementally increased Froude numbers are simulated based on previous experimental work. The vertical profiles of the non-dimensional double-averaged streamwise velocity agree well with the experimental data. The profiles display an inflection caused by the effects of the dunes within the form-induced sublayer, where the individual profiles are reduced by wake flow. As the Froude number increases, the flow regime transitions from subcritical flow to supercritical flow, and the mean streamwise velocity and the shear velocity increase. Additionally, the reattachment location of the recirculation zone downstream of the crest moves upwards, while the location of the highest water elevation moves downwards, approaching the crest of the dune. The fluctuation in the free water surface increases as the Froude number increases.
Operation and Control Analysis of Dual Evaporator Heat Pump-solar Drying System
Authors: Xue Hanling , Yan Yuting , Wu Yehao , Wan Xuening
Published: February 2021

In order to meet the new environmental requirements of drying technology and reduce energy consumption costs, this paper uses solar energy and air energy to combine multiple heat sources to propose a heat pump-solar drying system for crop drying. Among them, the heat pump system is a dual evaporator parallel mode, and the solar energy adopts the form of comprehensive application in the system. The operation principle of the system is analyzed, and the operation effect of the vacuum tube hot water collection system is obtained through Trnsys simulation, and a multi-energy complementary control method is proposed for the system, which makes the system operation more energy-saving and flexible.
Optimization of Control Strategy for Photovoltaic Power Generation System in Weak Grid
Authors: Chen Pengfei , Zhao Youning , Wang Yitong
Published: February 2021

With the continuous use of traditional fossil energy, the energy crisis and environmental pollution problems become increasingly obvious. As a recyclable, renewable and pollution-free clean energy, solar energy has received more and more social attention. Photovoltaic power generation has become one of the main forms of solar energy utilization for its convenience, safety and other advantages. This paper presents a control method to achieve maximum output efficiency tracking, guaranteeing the output current quality of photovoltaic cells. The design of photovoltaic power generation system and the setting of control parameters are often based on ideal conditions. However, in the real process such as long distance transmission, a large number of line impedances will inevitably be introduced into the power grid, which will lead to the increase of harmonic content of grid connected current and the generation of spike resonance among parameters. Under the combined action of non-linear load and line impedance, how to improve the system stability and reduce the negative impact on the inverted grid connected system has become a problem to be solved. This paper presents an impedance reconfiguration method to increase the stability of photovoltaic power generation system in weak grid.
Aggregation Optimization Method of Virtual Energy Storage for Electric Vehicles Considering User Elasticity
Authors: Liu Lu , Niu Meng , Li Bei , Zhang Yue , Zou Mengjiao , Liu Dunnan , Zhang Tingting , Wang Lingxiang , Shang Shanshan , Liu Mingguang
Published: February 2021

With the continuous development of electric vehicle charging facilities, the impact of electric vehicles on the power grid is growing. Considering the automatic demand response technology of smart grid, charging pile operators participate in the demand response plan and guide users to charge according to the price signal or incentive mechanism, which can ensure the safety of the power grid and reduce the negative effects of electric vehicles on the grid influence. Based on the theory of demand side response elasticity, this paper analyzes the whole process of electric vehicle users' participation in demand response and its influencing factors, classifies electric vehicle users based on demand response, and then quantitatively analyzes users' demand response from the perspective of electricity price elasticity and consumption psychology. Finally, the demand side response model with user participation is established. The application of the model can effectively improve the enthusiasm of electric vehicle users to participate in demand side response, and reduce the negative impact of electric vehicles on the power grid.
Trading Model and Development Path of Demand-Side Resource Aggregators
Authors: Liu Dunnan , Zhang Yue , Zou Mengjiao , Zhang Tingting , Wang Lingxiang , Shang Shanshan , Liu Mingguang , Wang Wen , Peng Xiaofeng
Published: February 2021

With the accelerating process of re-electrification, the high-proportion access of new energy and the rapid development of flexible demand-side resources, it is of great significance to fully tap demand-side resources, and explore the trading mode and market mechanism of a wide range of load aggregators participating in the operation of the power system. This paper studies the trading mode and development path of load aggregators participating in the electricity market, which can guide the demand-sides resources to participate in the power grid regulation, and link the demand-side resources ‘flexibility value with the power system’s regulation demand. At the same time, the uncertainty and randomness of the load-side resources will be reduced, and the system regulating performance and renewable energy consumption capacity will be improved.
Consolidation analysis and effect analysis in the treatment of soft foundation by vacuum preloading
Authors: Fan Ling , Chen Shaofan
Published: February 2021

Vacuum preloading is a common method in the treatment of soft soil foundation. Combined with field test engineering cases, the plastic drainage board is equivalently processed into sand well units. The analytical solution of the sand well consolidation equation under the linear attenuation of vacuum preloading is derived to evaluate the consolidation degree of the site. The results showed that the vacuum negative pressure reached -85 kPa at 20 d, and the pore water pressure in the silt soil continued to dissipate to produce negative pore pressure, and finally reached a stable value at 60 d. Considering that the vacuum negative pressure affects the change of pore pressure, it is concluded that the vacuum negative pressure attenuates 3.4 kPa/m along the depth of the soil. Based on the data obtained on site, the solution in this paper is compared with the Hansbo solution, which is closer to the actual project.
Research Progress of Unsaturated Strongly Weathered Sericite Schist Residual Soil
Authors: Guang-ying Nie , Yu Xia , Qing-wen Zhang
Published: February 2021

The settlement and deformation of soft rock are the main problems hindering the construction of tunnel engineering. The use of soft rock and its residual soil has become the focus of engineering development at home and abroad. Sericite schist is an extremely soft rock, and most of the sericite schist residual soil in nature is in an unsaturated state. The Baishitou Tunnel of Dali-Lincang Railway is located in Yun County, Lincang City, Yunnan Province. The surrounding rock in the tunnel is mainly soft rock, such as sericite schist and carbonaceous schist. Due to the action of the earthquake, the rock mass is easily broken and its strength is low, making construction extremely difficult. Strongly weathered sericite schist has the characteristics of soft rock, easy to weather, and the rock mass is relatively easy to break. Its residual soil has similar properties to its parent rock and is often encountered in actual engineering. The research on unsaturated strongly weathered sericite schist and its residual soil has become the focus of research by scholars at home and abroad. The engineering properties of unsaturated soils have become one of the main research directions of soil mechanics.
Spatial distribution characteristics of irrigation water quality assessment in the Central-Western Guanzhong Basin, China
Authors: Xu Panpan , Zhang Qiying , Qian Hui , Zheng Le
Published: February 2021

Groundwater plays an important role for agricultural irrigation in the Guanzhong Basin. In order to investigate its spatial distribution characteristics of groundwater suitability for irrigation in the central-western Guanzhong Basin, total 97 groundwater samples were collected and analysed. Four indicators, including sodium percentage (Na%), residual sodium carbonate (RSC), magnesium hazard (MH), and potential salinity (PS), were selected to evaluate the groundwater for irrigation use. The results show that the groundwater in the southern and western areas is more suitable for irrigation than that in the northern and central areas of the basin. Besides, the consistent evaluation results are obtained based on these four indicators, which indicates that they are applicable for the assessment of groundwater irrigation use in study area. Furthermore, the findings of this study would provide guidance for spatial management decision of irrigation groundwater in the central-western Guanzhong Basin.
Research on risk Management of green Building development
Authors: Li Zhengdao
Published: February 2021

: With the improvement of residents' requirements for housing quality and the increasing tension of energy, more and more attention has been paid to green buildings. Green buildings can effectively use resources, change the current situation of excessive consumption and waste of energy, and at the same time, enable residents to experience more environmental protection and excellent living conditions. Although green building has a good development space in our country, the development time is short, lack of development experience. This paper expounds the connotation of green building, analyzes its development status, and introduces the general methods of risk identification, risk assessment and risk response. This paper discusses the risk factors of green building development in China, compares and analyzes the risk factors, and puts forward some general measures to deal with the risks.
Research on Factors Affecting Green Airport Development Based on Scale Analysis
Authors: Ming-jun LI , Xiang-dong LI
Published: February 2021

This paper adopts the mixed methods of literature survey, expert panel discussion and questionnaire, and makes use of the Likert scale with an aim to select the connotation of green airport from four aspects including resource saving, environment friendliness, efficient operation and people-orientation. An ordered multi-class regression model was used as well to analyze the main factors affecting the development of green airports. According to the results of the study, coordinating airport planning and construction, airspace system reform, APU replacement, and “oil-to-electricity” of airport vehicles are factors that are significantly effective in the establishment of a green airport. The findings of the present study provide both theoretical support and empirical evidence for the design demonstration and interpretation of green airport policies.
The Compliance Risk Assessment of Electric Power Market based on Bayesian Comprehensive Evaluation Model
Authors: Jin Luosong , Chen Cheng , Yu Jing , Wang Xiangyang , Miao Qin
Published: February 2021

With the deepening of the new round of power system reform, the importance of power market compliance risk management is further highlighted. And compliance risk assessment is a key component of compliance risk management. Based on the compliance risk points of each participant in the power market, this paper constructs the compliance risk evaluation indication system of the power market. We determine the weight of each indicator by integrating the analytic hierarchy process, the improved entropy weight method and Bayesian comprehensive evaluation model. And then the compliance risk evaluation value of the power market is obtained, which provides effective support for the compliance risk management of the power market.
Research on Carbon Emissions Reduction of Iron and Steel Remanufacturing Industry Supply Chain
Authors: Xiao Liming Zhang Gang , Chen Xuewu , Yang Wei
Published: February 2021

The steel industry occupies an important position in China's economic development, but it also consumes a lot of energy and produces CO2. Iron and steel remanufacturing can recycle scrap iron as raw materials for crude steel smelting and reduce energy consumption. However, different raw materials in the supply chain will result in different steel plants’ choice of supplier, purchase volume, and production volume. These choices will affect the economic cost and carbon emissions of the entire system. This paper establishes a model to simulate the economic cost and carbon emissions of the supply chain system. Under various constraints, the carbon emissions are set at 95% and 90% of the previous year's carbon emissions as constraints to solve the system’s impact on suppliers selection and processing distribution of steel plants. The results show that as carbon emission constraints become more stringent, steel plants will choose suppliers with better quality raw materials, and processing production will shift to steel plants with lower carbon emission factors. It is worth noting that with the strict carbon emission restrictions, at 90%, the economic cost will rise rapidly, so too strict carbon emission restrictions should be carefully considered.
Integrated Intelligent Pollutant Cleaning System for Urban Lakes
Authors: He Runhua , Zhang Yan
Published: February 2021

Aiming at the problems of high manual labor intensity, low intelligence, and single cleaning types in urban lakes, from the perspective of practicability, an integrated intelligent pollutant cleaning system for urban lakes is designed and developed. The overall design plan is proposed, and the structure design and function development are completed. Through the integrated cleaning technology of solid and liquid pollutants, the simultaneous development of water body cleaning and water quality monitoring is realized. It also has the post-processing function of monitoring, cleaning and garbage cleaning of solid and liquid pollutants in urban lake water, realizing the integrity of the pollutant cleaning chain. Through the production and experiment of each part of the device, the control and function of the designed core pollutant cleaning ship are verified, which provides a basis for the application of the actual cleaning system.
Numerical simulation study on water supply uniformity of the water pipe under the jigger sieve
Authors: Shi Bingsen , Li Chaodong , Lou Dean
Published: February 2021

This study uses computational fluid dynamics software to simulate the water pipe under the sieve of the jigger to explore the relationship between the pressure and flow rates of the sieve water pipe of both inlet and outlet, which mainly includes the relationships between the inlet pressure and the total discharge of the outlet, and between the outlet position and the discharge of each outlet, so as to provide reference for a more even water supply for coal preparation in jiggers.
Comparative Analysis of Environmental Identity and Animal Attitude Between Male and Female
Authors: Yue Dan , Wang Shuai , Liang Xiao , Tong Zepeng , Sun Yan
Published: February 2021

This study investigated the contrast of environmental identity and animal attitudes between male and female. A total of 387 participants (170males and 217females) were selected by snowball sampling for online questionnaires. Questionnaire survey method was adopted, T test and Pearson correlation analysis method were used to obtain the results. Result shows that: (1) the environmental identity of the male group was slightly lower than that of the female group with a significant difference. (2) There was no significant difference on animal attitudes between male and female. (3) The correlation between environmental identity and animal attitudes was significant. Nowadays, environmental identity and animal attitude have received increasing attention in China. This study only carries on the comparative analysis from the male and female difference. We can study the age, education level, urban and rural differences and other situational factors, which is also a good research direction in the future.
Advances in the treatment of phosphorus-containing wastewater
Authors: Li Yong , Nan Xiaolong , Li Dongyun , Wang Liming , Xu Rui , Li Qian
Published: February 2021

In recent years, many rivers, lakes and oceans around the world have exposed to diverse contaminants or red tides due to excessive discharge of nutrients such as nitrogen and phosphorus. The high content of phosphorus often leads to the nutrition of water body. Water resources have been seriously threatened, which has brought great impact on environment and public health. Therefore, the removal of phosphorus from wastewater attracts more and more attention. This work reviewed the forms, hazards and treatment of phosphorus in wastewater, and focuses on the methods of phosphorus-containing wastewater such as chemical precipitation, adsorption, ion exchange, membrane separation and biological methods. With the current economic and development of world, the bio-treatment of phosphorus-containing wastewater will become a research trend in the future, and the research and development of new technologies for phosphorus-containing wastewater will be an important topic for the treatment of phosphorus-containing wastewater in the future.
Rinsing Condition Optimization of the Membrane Fouled by Yeast Suspension
Authors: Guo Yangyang , Qiao Zhaoyu , Wang Zhan , Luo Huijia , Wang Xi
Published: February 2021

In order to sufficiently study the effects of stirring speed and temperature on the membrane flux, the flux recovery rate (FRR) and model parameters (k1, k2, k3
and Ri
) of the PAN membrane (200kDa) fouled by yeast suspension, a series of rinsing experiments were carried out. Meanwhile, the instantaneous membrane flux was predicted by the rinsing model and corresponding regression equation of model parameters was obtained. The result indicated that the model shows a good agreement (R
2>0.9700) and the temperature has a more significant effect on FRR and model parameters (k1, k2, k3
and Ri
). FRR increased from 58.40% to 99.41% when the temperature increase from 25°C to 55°C (the rate constant of dissolution increased from 0.00371 m−1 to 0.00531 m−1) while it only increased from 55.67% to 67.50% when the stirring speed increases from 200 rpm to 800 rpm (the rate constant of dissolution increased from 0.00366 m−1 to 0.00456 m−1). In addition, the rinsing condition can be optimized by the combination of the prediction model of flux (equation (1)) and the regression equation (equation (2)) to obtain the optimal cleaning condition.
Quantitative Analysis of High-speed Rail Spillover Effect—Evidence from Sichuan Tourism
Authors: Li Guopeng
Published: February 2021

Since China opened its first high-speed railway in August 2008, high-speed railways have developed rapidly in China. The rapid development of high-speed rail has brought a huge spillover to China's social and economic development. An important aspect is that high-speed rail has promoted the transformation and upgrading of the regional economic structure. Taking Sichuan province as an example, this paper uses the difference in difference (DID) method to analyze the effect of the opening of high-speed rail on the development of tourism. The conclusions of this paper show that the opening of high-speed rail has promoted tourism development of Sichuan province. This paper also has some important implications for the planning and construction of high-speed rails in other regions.
Study on coordination and quantification of ecological protection and high quality development in the Yellow River Basin
Authors: Hua Gao , Huan Zhang
Published: February 2021

In this paper, a quantitative index system for the coordinated promotion of ecological protection and high-quality development in the Yellow River Basin is constructed, and the method of "single index quantification multi index synthesis multi criteria integration" is adopted to quantitatively evaluate the coordination degree of ecological protection and high-quality development in the Yellow River Basin. Using the data of the Yellow River Basin from 2009 to 2018 for example, the results show that the coordination degree of the Yellow River Basin shows an upward trend from "close coordination" to "relatively collaborative" from 2009 to 2018.
Research on Reliability Evaluation Method of Sanitation Vehicles under Small Sample Data
Authors: He YuLong
Published: February 2021

Aiming at the problem of insufficient failure data of sanitation vehicles, a data expansion model based on gray neural network is proposed. First, the gray model is used to predict the error sequence between the true value and the predicted value; input the error sequence into the neural network, and calculate the error prediction sequence by adjusting parameters such as neurons and weights; the predicted error sequence is multiplied by the weight coefficient and subtracted from the prediction result of the gray model to obtain the final prediction result. The results show that the combined forecasting model is more accurate. This method enlarges the number of fault data samples while maintaining the original data distribution law to determine the reliability distribution model.
Research on the influence mechanism of safety risk factors on traffic organization of high-speed railway construction
Authors: Shen Zebin , Zhang Meijie , Liu Yiyang , Jiang Chunlin
Published: February 2021

In the development of high-speed railway construction, the high-speed railway construction scheme and technology are constantly improved. Nowadays, the high-speed railway construction mainly relies on the traffic organization of the railway to organize the transportation of prefabricated components and carry out hoisting. In the process of traffic operation organization of railway engineering, the construction company often faces many safety risks. Therefore, it is of great significance to analyze the influence mechanism of various risk factors on the operation and safety of Railway Engineering and put forward corresponding suggestions. In this paper, through literature analysis and expert interviews, nine key factors are selected. The safety risk factors are divided from four dimensions of personnel, machinery, management and environment. The importance of these risk factors is ranked by AHP, and Through the method of interpretative structural model, this paper uses these nine key factors to build a five layer interpretative structural model, and uses interpretative structural model to analyze the influence mechanism of safety risk factors on driving organization safety.
Structural analysis of a multi-tower building with a large chassis in a business district
Authors: Wang Liang , Lei Honggang
Published: February 2021

A business district building consists of two tower structures with basements and common podium and is a multi-tower structure with large chassis. The structural layout of the two towers is identical, both adopt the frame-core tube structure system with a total structural height of 156.85m. The seismic response characteristics of multi-tower structure with large chassis were analyzed through comparing the calculation results of single-tower model by SATWE software and multi-tower model with large chassis by MIDAS software.The results show that the seismic shear force of the podium significantly reduces and the seismic shear force of the towers up the podium increases. The vibration mode of the two-tower structure contains the vibration of two single towers, but it is not a simple superposition of dynamic characteristics, which is more complex.
Research on Food Safety and Security of Cold Chain Logistics
Authors: Yu Zexia , Liu Yinkai , Wang Qinghui , Sun Lei , Sun Shuangyan
Published: February 2021

Fresh fruits and vegetables are the necessities of daily life and provide rich nutrients for people's daily life. As the country with the largest population, the annual consumption of seasonal agricultural products, dairy products and aquatic products in China is huge. With the continuous development of e-commerce, the transportation and circulation of fresh fruit has become more extensive. However, there are still some hidden dangers in the cold chain logistics of food in our country, and the safety problems such as pollution, deterioration and decay of agricultural products in the course of transportation also lead to serious loss of commodities, and the problem of food safety can not be guaranteed.According to the relevant data, the annual loss of fresh fruits and vegetables in transit in China in the world ranking is very high.Therefore, the rapid development of science and technology in recent years and the demand for the transportation of fresh fruits and vegetables have greatly improved the transportation conditions of fresh fruits and vegetables.In view of this problem, this paper analyzes the problem of food safety in cold chain logistics in China and puts forward relevant safeguard measures
Influencing factors and optimization of ship energy efficiency under the background of climate change
Authors: Jia Zhijie
Published: February 2021

Shipbuilding industry is a modern comprehensive industry that provides technical equipment for water transportation, marine development and national defense construction, and is an important part of advanced equipment manufacturing industry. The development trend of ship spare parts management must be combined with information technology to make it more integrated, intelligent and networked, and distributed processing information system will be developed and adopted in large quantities. Under the background of climate change, it is necessary to study the synergistic effect of clean energy utilization between ships and routes, and effectively improve energy utilization efficiency, so as to realize the real-time collection, monitoring, management and early warning of ship energy consumption data, and improve the comprehensive management level of ship energy.
Environmental uncertainty, equity nature and inefficient investment -- Based on the study of energy enterprises
Authors: Yue Qin , Gao Sijie
Published: February 2021

The healthy development of energy enterprises plays an important role in the development of national economy, energy security, sustainable use of energy and environmentally friendly development. Investment, as an important management function of enterprises, cannot be ignored for the operation and development of energy enterprises. The uncertainty of environment is a common problem that energy enterprises have to face. In this case, the investment and decision-making behavior of energy enterprises will also be affected. There is a general problem of non-efficiency of investment. How to do the correct and efficient investment decisions has become a problem to be solved, energy companies. This paper studies the degree of inefficient investment of energy enterprises under environmental uncertainty, and discusses the moderating effect of equity nature on the degree of environmental uncertainty and inefficient investment. The results show that the greater the degree of environmental uncertainty, the more serious the degree of inefficient investment of energy enterprises; the degree of non-state-owned energy enterprises is more serious than that of state-owned energy enterprises; state-owned energy enterprises can adjust the impact of environmental uncertainty on inefficient investment, that is, compared with non-state-owned enterprises, environmental uncertainty has less impact on inefficient investment of state-owned enterprise.
Research on Optimization of Atmospheric Environmental Quality and Countermeasures
Authors: Li SuMei
Published: February 2021

With the rapid development of economy and society, energy consumption is further accelerated, and the quality of atmospheric environment is also seriously challenged. In order to optimize the quality of the atmospheric environment, this paper preprocesses the relevant raw data of the atmospheric environment quality, analyzes the air composition through the correlation coefficient, uses the whitening function to establish the atmospheric environmental quality analysis standard, and calculates its comprehensive pollution index. The government should formulate corresponding pollution prevention and control countermeasures for industrial pollutants, motor vehicle exhaust and plant greening. The results show that the air pollution index (API) can be drastically reduced if the pollution prevention and control measures are implemented in multiple areas of a certain city.
Analysis and Peak Value Prediction of Rainfall Component Factors Influencing Seepage Flow for Homogeneous Earth Dams
Authors: He Lu , Wang Shijun , Gu Yanchang , Pang Qiong , Wu Yunxing
Published: February 2021

The rainfall component of seepage flow is an important indicator for monitoring earth dam safety. Compared with previous practice of only analyzing rainfall, this paper divides the analysis dimensions into three categories according to the seepage process in the process of rainfall: the saturation permeability coefficient of the soil receiving the rainfall, the rainfall intensity and rainfall duration. This paper conducted FE simulation according to the principle of unsaturated seepage flow, and it is concluded that: the influence of different rainfall intensity on seepage flow is roughly linear and can be expressed by a first power factor; the influence of different saturation permeability coefficient and rainfall duration on seepage flow is obviously nonlinear, and should be expressed by multiple powers. Based on the above law, the model expression of peak seepage flow prediction was established, and both the fitting effect and prediction accuracy were good. The results show that the law of influence factors has been summarized correctly, and the research result can provide effective theoretical support for the seepage flow monitoring and early warning and safety monitoring for homogeneous earth dams.
Research on Wind Environment Simulation of Commercial District Based on Phoenics—Taking Shanghai Central Building Group as an Example
Authors: Yang Yao , Gou Aiping
Published: February 2021

As one of the central cities of my country's economic construction integration, Shanghai has continuously emerged with high-rise buildings under the trend of a threedimensional urban process. At the same time, the urban environment has become a problem that cannot be ignored, so it is necessary to conduct in-depth research on the wind environment of the building complex. Aiming at the wind environment problems in the city, this paper takes Shanghai’s central business district as an example, uses the software Phoenics to simulate the wind environment of the downtown building group, analyzes the types and functions of the business district building group, and aims at the existing wind environment propose solutions to the problems and provide reference theoretical basis and optimization basis for the formulation of relevant planning and design standards for the central area.
Socio-economic factors on haze pollution: based on panel data of 30 provinces in China
Authors: Huang Minjun , Guo Zhilin , Guo Yangli
Published: February 2021

Since Reform and Opening-up, China’s economy has been developing rapidly and per capita GDP has been raising. However, along with the rapid development of the economy, the problem of air pollution such as haze becomes increasingly serious, which has seriously affected the health of residents and the sustainable development of the economy. In this paper, we adopt spatial econometrics to explore the relationship between socio-economic factors and haze pollution. Firstly, there is significant spatial autocorrelation in haze pollution. Secondly, population, coal consumption and urbanization have positive and significant impacts on haze pollution. In this regard, governments should coordinate economic growth with environmental protection, balance the relationship between economic growth and environmental pollution.
Research Progress and Review of Stainless Steel Civil Architecture
Authors: Chang Xuan , Lei Hong-gang
Published: February 2021

Compared with carbon steel, stainless steel has a series of excellent characteristics, such as beautiful shape, corrosion resistance and ductility. China as a large stainless steel production, but in the face of the study of stainless steel in the building is not thorough, in order to better use of stainless steel in the building structure, we need to increase the study of stainless steel.Through a large number of retrieval of domestic and foreign relevant scholars research,In this paper, the research achievements and progress of stainless steel civil building are reviewed from two aspects: stainless steel material and stainless steel connection.By comparing the similarities and differences between Chinese and European stainless steel codes, this paper finds out the shortcomings, and finally puts forward some suggestions on the application and research of stainless steel in civil buildings.
Pollution and health risk assessment of heavy metals following repeated biogas slurry application in two vegetable fields
Authors: Xie Jiayu , Li Fucheng , Mei Bo
Published: February 2021

Repeated biogas slurry application in soil may cause accumulation of heavy metals. In the experiment, repeated biogas slurry application for 4 (N1) and 10 years (N2) in two vegetable fields, to detect heavy metal content (Zn, Cu, Cr, Pb) and assessment the risk of shortand long-term fertilizing on ecology and health. The result showed, long-term fertilization has increased the content of heavy metal. Zn and Cu in topsoil (0-20 cm) in field N2 exceed the standard, resulting in mild contamination. The value of hazard quotient (HQ) in the same land were as follows: Cr>Pb>Cu>Zn. In general, the noncarcinogenic risk and carcinogenic risk index in N2 were higher than those of N1. In the survey area, there was no noncarcinogenic risk and carcinogenic risk for adults and children. However, children are more sensitive to environmental changes than adults and should pay more attention to protect their health. Longterm monitoring and evaluation of heavy metal hazards is necessary to ensure the safety of biogas slurry used in farmland.