bluuebunny/crossref_metadata_2025 huggingface dataset:
Research and Application of Power Terminal Communication Access System Based on Heterogeneous Network Technology
Authors: Huan Li , Feng Sun , Lishuai He , Bin Lu , Dongdong Wang , Fanbo Meng , Wenjia Zhu , Chuanbo Liu , Qiang Zhu , Nan Li , Wenxiao Zhang , Dongfang Zhang , Bolong Wang
Published: July 2020

In recent years, the basic business of power distribution production, such as distribution automation, power consumption information collection and load control, distributed power supply and so on, is growing rapidly, and the demand for power terminal communication access is increasing. Based on the analysis and research of terminal communication access technology, this paper proposes a heterogeneous network combination scheme which integrates multiple terminal communication technologies to solve the problems such as the limitation of existing terminal communication access network technology on the power distribution side. Heterogeneous network networking technology realizes the integration application of wireless private network, low-power wide area network, medium voltage broadband carrier and other channels. It can give full play to the advantages of various communication modes, improve the communication guarantee ability, meet the requirements of full coverage of power terminal communication access network business, provide strong channel support for terminal information return, and provide communication system construction for distribution terminal Useful reference.
Design of Multi-Functional Lighting System Based on Solar Power
Authors: Zhihong Xiao
Published: July 2020

This paper introduces the multi-functional lighting system which is a national undergraduate innovation training program. In view of the increasing energy shortage and environmental pollution, a multi-functional lighting system powered by solar energy is designed by project team members. In addition to the lighting function, the system also has killing insect and counting functions on some special occasions. This system uses STC90C516 as the control center, uses infrared diffuse reflection photoelectric switch and infrared human body sensor as the counting sensor, multi-color LED array as the lighting device, using the phototaxis of pests to attract pests and kill them with high-voltage power grid. The results show that the system is energy-saving, environmental friendly, accurate in counting, and has good insecticidal effect on many kinds of pests.
Prediction and Assessment of Rainstorm Flooding Disasters Risk in Shanghai Metropolitan Area in 2050
Authors: Song Yuanzhen , Zhu Ziming , Qin Menglin
Published: July 2020

Based on the theory of natural disaster risk, considering the natural environment and socioeconomic status comprehensively, with a target year of 2050, a risk assessment system and method for rainstorm flooding disasters risk in the Shanghai metropolitan area is constructed, and a division map of disaster risk is drawn. The results show that the regional differences in the risk of rainstorm flooding disasters in the Shanghai metropolitan area in 2050 are obvious. Hangzhou, Nantong, Ningbo, and Zhoushan in the east are high-risk areas of rainstorm flooding disasters. The medium-risk areas are mainly Shanghai, Huzhou, Changzhou, Wuxi, Jiaxing and other places. Suzhou, Jiaxing, Shaoxing and other places have lower risk indexes.
Discussion on the Application of Demand Analysis to Guide the PPP Model to Cross-regional Water Markets
Authors: Lijun Liu , Yijia Wang
Published: July 2020

There are successful and failure cases of PPP financing model projects in China. Combined with the respective interests of the two main participants of the PPP project, the government and social capital, the application analysis of the PPP model in China’s infrastructure sector put forward the view that demand analysis plays a key role in the success or failure of the PPP project. Based on this, combined with the characteristics of infrastructure, the characteristics and production of infrastructure rigid demand and elastic demand are briefly analyzed. The typical basic resources of water resources are taken as examples to analyze the rigid demand and elastic demand of water resources,and how to analyze the demand analysis of PPP projects, and explore them in cross-regional water markets.
Research on Combined Strategy of Cultural Heritage Conservation in Lingnan Impression Park
Authors: Wen Yifeng
Published: July 2020

This paper takes Lingnan Impression Park as case study to research on integrated strategies of cultural heritage conservation and reuse which combined three modes: 1) original site protection, 2) relocation and reconstruction, 3) new archaism architecture. Those modes of building with different attributions jointly constitute the Lingnan Impression Park displaying the traditional Lingnan (Cantonese) culture and atmosphere, making lingnan Impression Park as an attractive cultural tourism and suburban leisure destination, which has great significance for research on heritage conservation cooperated with tourism development.
Predicaments and Landscape Changes in Traditional Village Transformational Development - A Case Study of Chongqing, China
Authors: Zhang Jing
Published: July 2020

The protection of traditional villages plays an important role in the strategy of inheriting Chinese outstanding history and culture, and it is also an important type for the transformation and development of traditional farming civilization to modern ecological civilization. In this paper, it is held that, currently, traditional village transformation and development follow the laws of policy orientation attracting capital intervention, capital intervention promoting village development, and village development supporting policy orientation in turn with actual internal forces, realizing a ternary integrated development path for the country, market, and village. Based on the logic inference and deduction on the three-dimensional path driven by departmental policy capital, urban industrial and commercial capital as well as rural community and owned capital, a series of typical cases of Chongqing are selected for demonstration. Studies show: (1) At this stage, traditional village transformation and development will inevitably be driven by both internal and external forces, since the driving power of one single force is limited. Only by conforming to external driving forces such as policies and capital and internal endowments of village resources, culture and economic foundation, can the predicament in traditional village transformation and development be overcome; (2) The key to realizing rural transformation and development lies in stimulating internal driving forces of villages. Economic reconstruction with industry cultivation as its core is the most active factor in rural development, and it plays a leading role in social and landscape reconstruction; (3) Historical rural landscape is an important resource for the transformation and development of villages. Therefore, both macro policies and regulations and capital intervention should be based on a full understanding of the value of historical landscape, and a thorough and true cognition and evaluation on the composition and characteristics of historical landscape.
Study on the evaluation and countermeasures of ecosystem status of Guangzhou
Authors: Zhang Yinbo , Liu Xucheng , Liu Xianghua , Yang Kun , Zhou Wen , Wang Xiuming
Published: July 2020

It is the first time that we constructs the evaluation index system of Guangzhou’s ecosystem status from three aspects of ecological resources, ecological structure and ecological quality, analyzes the historical change characteristics of Guangzhou’s ecosystem status in the past 11 years and the ecosystem status of 11 districts. Due to the decrease of ecological land area and the continuous increase of construction land area, the evaluation scores of ecosystem status in Guangzhou have declined in recent years, and the differences of ecosystem status in 11 districts are also obvious. Guangzhou will promote the regional ecological environment and further carry forward the construction of ecological civilization through various methods, such as strengthening the protection of natural ecological environment, stepping up the supervision of ecological environment, etc.
Research on the Evaluation of the Input and Output Efficiency of Three Industries in Qinghai Province
Authors: Yafei Liu , Shengxi Ding
Published: July 2020

Since the western development, the investment in science and technology in Qinghai Province, the input of scientific and technological personnel, and the expenditure on new product development of large and medium-sized enterprises have continued to increase; the amount of patent output and the turnover of technology contracts in the output of science and technology have steadily increased, and new product sales Income fluctuations have risen, but there is a clear gap with Shaanxi and Gansu in the west. An analysis of the three industrial capital inputs and scientific and technological personnel inputs in Qinghai Province, and an evaluation of the efficiency of scientific and technological input and output, found that there are the following aspects of the technological input and output efficiency of various industries in Qinghai. Problems: insufficient scientific and technological input; lack of scientific and technological talents and inefficient coexistence of talent output; co-existence of growth in three industrial inputs and decline in scientific and technological output; misalignment of scientific and technological resource allocation and low level of scientific and technological management. Proposed the establishment of a stable growth mechanism for scientific and technological inputs; Strengthening the introduction of talents and improving the mechanism of selecting, educating and employing people; optimizing the combination of scientific and technological investment structure and adjusting and optimizing the industrial structure; accelerating the transformation of scientific and technological achievements to realistic productivity and other measures to promote the efficiency of scientific and technological innovation and achieve high-quality development in Qinghai Province.
Analysis of key points and corresponding effects of the construction of water-saving institutions
Authors: CaiXia Jin
Published: July 2020

The construction of water-saving institutions is an important part of the implementation of the priority policy of water-saving. In view of the current situation of the construction of water-saving institutions in Zhejiang province, the main problems in the constructions were summarized, and the key points of the constructions were put forward, which is of important reference significance to construct the water saving institutions. The main progress and experience was introduced and the water saving effect was analysed based an application case, which has a promising future for application.
Study of sustainable development in Yongkang city based on environmental capacity and pollutant control
Authors: Fu Lei , Wang Junmin , Jin Qiannan , You Aiju
Published: July 2020

Over the past centuries, due to the improvement of the understanding of the natural environment and social service function of rivers, many countries have started the research and practice of water environment protection. China also paid most of its attentions to the water environment in most of its cities and towns. Systematic calculation and analysis of the water environment status becomes famous in most of Chinese regions, which not only shows the current status of water environment protection in China but also indicates the methods to reduce the domestic pollution. In this study, Yongkang city is selected as a typical Chinese city, COD(Chemical Oxygen Demand) and NH3-N(Ammonia Nitrogen) are considered as two typical pollutants, both water environmental capacity and current pollution are calculated. The environmental bearing capacity coefficient is utilized to show the current status of pollution level. The comparison and analysis between the water environmental capacity and current pollution shows a good water quality status in Yongkang city. This study is also able to further improve the water quality and social development in Yongkang city in the future.
Analysis on the Policy Mechanism and Optimization of Green Technology Innovation in Manufacturing Industry—Based on the Data of Listed Companies in the New Energy Vehicle Industry
Authors: Lin Qiuman , Liu Qin
Published: July 2020

Government policy is an important means to promote green technology innovation in enterprises. However, scholars are unsure whether government policy can achieve the expected results. This paper selects new energy automobile companies as the research object, collects relevant data of 28 listed companies in this field for nearly 10 years, and uses panel threshold models to empirically test the impact of environmental regulations and government subsidies on corporate green technology innovation. Research shows that environmental regulation can significantly promote green technology innovation. When the intensity of environmental regulations is appropriate, government subsidies can achieve the best drive for green technology innovation. This article reveals the influencing factors and mechanism of corporate green technology innovation from a micro perspective, providing a scientific basis for optimizing government policies and promoting the green development of Chinese manufacturing.
Research on Manufacturing Green Innovation Capability Based on Big Data Mining—Taking the New Energy Vehicle Companies as an Example
Authors: Guo Feiran , Liu Qin
Published: July 2020

In the early stages of China’s economic development, the development mode characterized by “high pollution, high cost, and low efficiency” caused serious environmental pollution and resource shortages. The mode gradually restricted the healthy development of the industry. Accelerating economic system reform and promoting an update of green transformation about the industry are imminent. This research is based on text mining and sorting out of existing literature and news comments to construct an evaluation index for the green innovation capability of manufacturing companies. Through empirical research of new energy vehicle companies, this paper further analyzes the green innovation levels of typical domestic new energy vehicle companies. Empirical evidence shows that the level of green innovation of an enterprise is mainly determined by its ability to innovate green technology, and at the same time it is affected by the multiple effects of government policies, market environment, and consumer behavior. Finally, this article puts forward relevant suggestions for the development of the new energy vehicle industry from the government and enterprise levels.
Monitoring and statistical methods of irrigation water consumption of Wanyao Irrigation Area
Authors: Wang Helong , Wang Shiwu , Wen Jinhua , Wang Siqi , Zhu Mingjiang
Published: July 2020

Irrigation water consumption statistical work is very important to water resources management. As for Zhejiang province, the problems of irrigation water consumption statistics are that there are too many water sources to monitor which discharge and too many usages to separate from a certain amount of water. At the meantime, the irrigation water can return to the downstream fields and be reused in its irrigation, but the amount of reuse water is very difficult to monitor and count. Taking Wanyao irrigation area as the study object, the layout methods of monitoring facilities built to monitor the key sectors of water circulation were proposed, including the supplication sector, the utilization sector and the drainage sector. The water circulation model of irrigation area was constructed based on the monitoring facilities’ observed data, then the constructed model was applied to simulate the natural water circulation and the social water circulation. The supplication and utilization progress of irrigation water were extracted from the simulation results, and the reuse progress of irrigation water was analysed. Actual irrigation water consumption in irrigation area was counted in the last. The result shows that it’s feasible economically and technically to layout the monitoring facilities based on water circulation simulation of irrigation area, and the statistics method of irrigation water consumption by simulating the water circulation is reliable and high precise.
A Review of Researches on Plant Configuration and Decontamination Efficiency of Rain Gardens in China
Authors: Zhou P.L , Han J.Q , Zhang H.X
Published: July 2020

Rain garden is a low-impact development method that uses topographic design to store and purify rainwater, and then adjust rainwater to reuse rainwater. The plants in the rain garden are the key components of its function of storing and purifying rainwater. This article refers to the CNKI database literature about the selection and planting effects of rainwater garden plants as of October 2019. Using literature measurement analysis and content analysis methods, we found that: 1) The research on rainwater garden plants has been increasing and deepening, involving various disciplines; 2) Research on the configuration of rainwater garden plants has gradually shifted from qualitative research to quantitative research; 3) The types of rainwater garden plants that can be selected are diverse, and scientific configuration methods can improve efficiency; 4) Most research literature on plant purification in the aquatic or wet plants on the removal and purification of nitrogen, phosphorus, heavy metals and other pollutants and other aspects. Finally, it discusses the deficiencies of the rainwater garden plant research, and looks forward to its future research direction, aiming to provide reference for the rainwater garden plant selection and rainwater garden scientific construction in China.
Research on the Spatial-temporal Differences and Influencing Factors of Anhui Industrial Environmental Efficiency
Authors: Yao Z , Zhao H S , Liu X , Yu Q , Zhuang H X , Shen N Y
Published: July 2020

In order to improve the efficiency of industrial environment in Anhui Province and promote the coordinated development of industrial production and environmental protection, industrial waste water discharge, air particulate matter discharge and solid waste discharge are regarded as undesirable outputs. The model measures the industrial environmental efficiency of 16 prefecture-level cities in Anhui Province from 2013 to 2018, and fully considers the differences between regions; then, based on the analysis of the total factor productivity of the industrial environment, the impact of industrial environmental efficiency in each province is found factor. Finally, through the construction of the Malmquist index model, the spatial-temporal change trend of industrial environmental efficiency in Anhui Province was analyzed. Studies have shown that there is a clear difference in the efficiency of the industrial environment in Anhui Province. The change trend of TFP and TEC is basically the same. TEC is the main influencing factor of TFP. All regions should pay attention to technological innovation, adjust the existing industrial production model, coordinate the relationship between industrial development and resource environmental protection, and gradually improve their own industrial environmental efficiency.
Construction of Evaluation Index System of Green Development in the Yellow River Basin Based on DPSIR Model
Authors: Zhao Jinhui , Xiu Haoran , Wang Meng , Zhang Xiaokun
Published: July 2020

Under the strategic task of promoting high-quality green development in the Yellow River Basin, building an evaluation system for green development indicators in the Yellow River Basin is an urgent problem to be solved. This article combines the characteristics of the Yellow River Basin, comprehensively considers the main factors such as the natural environment and social economic system in the basin. Based on the DPSIR model, it constructs an evaluation indicator system which is suitable for the green development of the Yellow River Basin. The results show that the green development index of the Yellow River Basin is 2.55 which means the green development level is relatively low. Therefore, various measures should be taken to improve the green development level of the Yellow River Basin.
Situation analysis and development suggestion regarding carbon emission peaking
Authors: Zong Jianfang , Sun Liang , Bao Wei
Published: July 2020

The determination of positive, reasonable and realizable carbon emission peak target is the strategic selection for addressing climate change, which is in favor of the reversed transition of economic development mode to green low-carbon pattern. China definitely proposes to achieve the carbon emission peaking by about 2030. This paper sorts out the global carbon emission peaking conditions, including the carbon emission peaking time of major developed countries, and the prediction on China’s carbon emission peaking time. In addition, this paper also illustrates the fundamental laws of carbon emission peaking, including the overseas basic conditions, analysis of China’s carbon emission situation, and the key factors that affect China’s carbon emission peaking. Finally, this paper provides the suggestions regarding the promotion of China’s carbon emission peaking.
Thoughts on addressing climate change
Authors: Zong Jianfang , Sun Liang , Bao Wei
Published: July 2020

The climate change is the global issue widely concerned by the international society, which is related to the overall situation of China’s economic and social development. This paper illustrates the international mechanism of adapting to climate change, discriminates the connotation of response planning, including the connotation of mitigation planning, and the connotation of adaptation planning. This paper also establishes the planning research framework regarding the response to climate change, including the planning research framework regarding the climate change mitigation, and the adapting to climate change. In addition, this paper also introduces the actions and measures of major countries to address the climate change, defines China’s strategy and target for addressing climate change, and points out how to combat the challenges of climate change in China. Besides, this paper further illustrates China’s key tasks of scientific and technical actions for addressing climate change, and provides the suggestions regarding China’s response to climate change.
Study on the Influence of Typical Plant Roots on the Stability of Slope in the Hilly Areas of the Lower Yangtze River
Authors: Ling Mei , Xin Yu , Peng-ming Jiang
Published: July 2020

Plant roots have a positive effect on shallow landslides on slopes. In order to study the influence of typical vegetation on the slope stability in the hilly area of the lower reaches of the Yangtze River, the triaxial test was used to obtain the shear strength parameters of the root-soil complex of typical vegetation of Salix babylonica and Pterocarya stenoptera in the hilly areas of the lower Yangtze River. On this basis, the slope stability calculation model based on the limit element theory is established. The safety factor of the reinforced slope was calculated under three kinds of slope conditions (30°, 39°, 45°), and the influence of root type, position and depth on the slope stability was analyzed. Studies have shown that different types of plant roots mainly affect the stability of slope by enhancing the cohesion of soil. The improvement of slope stability by root system is related to the reinforcement position of root system. The effect of vegetation root on the reinforcement effect of slope The range is roughly in the vicinity of the sliding surface of the slope, and the closer to the sliding surface, the better. Plant roots have a peak effect on the slope at a certain depth, not as deep as possible. This paper provides a reference for studying the influence of vegetation on slope stability, and provides a reference for guiding the slope greening in the hilly areas of the lower Yangtze River.
Assessment of Sudden Siltation in port area based on numerical simulation
Authors: Chen Lei
Published: July 2020

During the typhoon period, sudden silting is easy to happen in the port area, which will affect the normal operation of the ship. It is an important reference for port maintenance to evaluate the Sudden Siltation after typhoon. In this study, a coupled mathematical model of wave, tidal current and sediment is established to simulate the sudden deposition of Ruoshan port area under the action of typical typhoon. The results show that the sediment concentration in the typhoon period is much higher than that in the normal weather because of the larger current velocity and the obvious wave action. The research results can provide design support for dredging and maintenance of Ruoshan port.
Study on Occurrence Characteristics and Natural Degradation of Polycyclic Aromatic Hydrocarbons in Mined-out Area of Northern Shaanxi Coal Mine
Authors: Lu Nan
Published: July 2020

The rapid economic development is accompanied by the rapid consumption of energy. Coal plays an important role in China’s energy production. With the continuous exploitation of coal resources, the mined-out area of coal mines has continued to increase. PAHs are common organic pollutants in coal mines. With the gradual deepening of the research on PAHs, the natural degradation of indigenous dominant bacteria has become the best choice. The application of microbial treatment to repair PAHs-contaminated soil, and the research on the relationship between PAHs and degrading microorganisms are great significance to the bioremediation of PAHs pollution.
Study on the relationship between zooplankton and water quality in urban lakes
Authors: Chen Guangrong
Published: July 2020

Zooplankton played an important role in freshwater ecosystem. Its distribution was affected by the water quality of the water body. The urban lake water body performed the functions of ecology and social services, and the water environment was easily influenced by human activities. By analyzing the responses of zooplankton to the changes of water quality of urban lakes, including the difference in species and abundance, the influence of eutrophication on zooplankton in urban lakes was analyzed, and the relationship between zooplankton and water quality indicators and trophic level was analyzed with examples of tropical shallow water lakes. The results showed that zooplankton distribution was related to water quality and nutrient levels. The correlation could provide references for the ecological and environmental health inspection and ecological restoration of urban lakes.
BP-ANN model to optimize the structural parameter setting of transfer point
Authors: Guixin Shi , Futang Xing , Yue Huang , Xiaogang Wang
Published: July 2020

In order to optimize the structural parameter setting at the transfer point, the principle of CFD-DEM coupling is used to simulate the production conditions of the material mass flow rate: 150kg/s, height difference: 3m, material density: 1400kg/cm3, and the operation of different structural parameter settings at the transfer point. Based on the pumping volume, equipment wear degree and dust concentration in the exhaust pipe, the weight coefficients of the three indicators given by the comprehensive analytic hierarchy process and the CRITIC method are 0.49, 0.32 and 0.16 respectively, and then the structure parameter settings obtained by the orthogonal test are simulated and optimized by using the BP neural network model. The optimized parameters of orthogonal test are the chute angle of 45 degrees, the number of suction ports of 3, the belt speed of 1.5m/s and bandwidth of 1000mm; the optimized parameters of BP neural network model simulation are chute angle of 45.53 degrees, the number of suction ports of 2.86, the belt speed of 1.48m/s and the bandwidth of 996mm. The results show that the BP-ANN model has the advantages of simplification, high efficiency and time saving, and can provide a new method for enterprises to set the structural parameters at the transfer points reasonably according to their own production conditions.
Discussion on the dynamic corner frequency in the case of 2011 Great East Japan Earthquake
Authors: Tao Zhengru , Wang Xinyan , Song Yana
Published: July 2020

For the simulation of broadband near-fault ground motion, one of the key points is to start with a reasonable source spectral model. Corner frequency is a parameter of source spectrum. We redefined the parameterNRijof the dynamic corner frequency as the number of rupturing sub-faults, rather than that of ruptured ones, in the model of Motazedian and Atkinson (2005). Four sizes of sub-fault are given, and ground motion on 51 bedrock stations is simulated randomly by a finite fault model, in the case of the 2011 Great East Japan Earthquake. The variation with sub-faults size is reduced to a certain extent, and the improvement is more obvious at the periods of 0.1-1s. By comparing with the response spectra of strong ground motion records, the long-period parts fit better, and the short-period (≤0.1s) parts are lower than the observed spectra, while for several stations, the simulated spectra fit with the observed ones over the periods to 10s. And, the influence of the corresponding energy conservation factor (or scaling factor) on the simulated ground motion is analysed. Compared with strong ground motion records, the dependence on sub-fault size is further weakened, and the simulated spectra fit with the observed ones at the periods of less than 0.1s.
Numerical Simulation Study On Flows In Natural-like Fishway Of Low-head Junction
Authors: Zhou Shengzhi , Xu Gang , Hu Jinchun , Bao Zhongjin , Tu Xinggang , Wang Yuehua , Wang Ziming
Published: July 2020

Based on a certain low-head ecological weir project’s requirement of the fishway construction and fish migration, a three-dimensional mathematical model of a natural fishway was established. The structure of the fishway which includes the bottom slope and the number of partition walls has great influence on the water flow conditions of the fishway pond room, which were analyzed from three aspects: the flow pattern of the tank room, the mainstream flow velocity, and the turbulent kinetic energy. The numerical simulation results were verified by model tests. The results of the research show that when the bottom slope is set to i = 1:35 the natural fishway has an obvious three-dimensional water flow structure. What’s more, under this circumstance, the mainstream of the fishway is clear, the flow pattern is good. The overall turbulent kinetic energy is not large, and the maximum flow velocity at the vertical joint is basically the same, slower than 1.5ms−1, which basically meets the target fish’s traceability requirements. With pebbles applied, the flow of the water in the pond room becomes richer. With the traceback path increased, the efficiency of fish communities can be vastly improved. The actual application of the fishway should adjust to the design of the ecological weir and its topographic and geological conditions.
Quantitative Simulation of Groundwater by Mathematical Model in Muzhu River Aquifer using GMS
Authors: Han Zhong , Qu Guangrui , Huang Linxian
Published: July 2020

Excessive exploitation of groundwater resources in Muzhu river aquifer has caused serious problem such as groundwater shortage and pollution. Therefore, information about the quantity of Muzhu river aquifer is an urgent necessary for optimum protection, management of groundwater resources, and stopping the future damages. In this study, the quantity of Muzhu river aquifer is investigated by numerical simulation software GMS. The numerical model for this aquifer was calibrated by observed data. Results showed these: the amount of recharge to aquifer is 12557.53×104 m3/a, the amount of discharge from aquifer is 11805.09×104 m3/a, and the net recharge is 752.44×104 m3/a, it indicated that available groundwater resources have reached its limitation. Therefore, we suggested that exploitation of groundwater should be reduced and discharge from some of agricultural wells should be stopped.
Evaluation of Operation Management of Sewage Treatment Plants in Guangxi and Analysis
Authors: Yuling Zhang , Guanwen Cheng , Liao Zhang , Qiaoquan Wei , Shaoyan Duan , Jiangzhou Wei , Bangzhou Sun , Xing Yang
Published: July 2020

The operation efficiency, effect and energy consumption of a township sewage treatment plant are the main basis for evaluating its operation and management level. Statistics on the operation and management data of 22 township sewage treatment plants show that: the facility operation rate is high and the treatment effect is good, but the average hydraulic load rate and the main pollutant load rate are low, the unit energy consumption of pollutants is high, the sludge treatment and disposal, and the process insufficient operating stability, the main incentives and design inlet water quality and design scale are too large, the DMBR process aeration intensity is too high, the staff’s operation control ability and management level have not adapted to this water quality and water volume change and the requirements for process operation related.
Enhanced removal of NH4
+ in bioretention by sludge biochar
Authors: Nan Li , ZhiYong Duan , YingJiu Liu
Published: July 2020

Both bioretention and sludge biochar have better effects to the removal of nitrogen and phosphorus removal in water. Combining them coulid improve the effect of bioretention on NH4
+. After applying sludge biochar, the adsorption effect of filler on NH4
+ was improved. When the sludge biochar was applied to the filler, on the top of the submerged area in the tank, the removal rate of NH4
+ could reach 88.62%∼94.48%.
Research on removal of NOX, SO2 and PM from flue gas of coal-fired boilers and engineering application
Authors: Tang Zhipeng , Zhou Rulu , Cui DongFeng , Yang Jianchao , Ma Sai , Wei Ran
Published: July 2020

Removal of NOX and SO2 from flue gas by Ozone (O3) oxidation and NaOH absorption was carried out in practical engineering. The effects of the liquid to gas ratio (L/G), the molar ratio of O3 dosage and initial content of NOX (O3/NOX), pH and NaOH concentrations on the removal efficiencies of NOx and SO2 were investigated. In addition, the influences of O3/NOX and voltage on the removal of PM were analyzed. The results show that the NOX removal efficiency increases with the increasing of O3/NOX (0∼2.0), solution pH (4∼7) and L/G (2∼8), while is slightly affected by NaOH concentration (0.05∼1%). The SO2 removal efficiency increases with the increase of L/G from 2 to 8 L/Nm3, but is hardly changed by O3/NOX (0∼2.0), NaOH concentration (0.05∼1%) and solution pH (4∼10). It was found that the outlet concentration of PM (CPM) decreased with the rise of voltage ranging from 0 to 40 kV, however, slightly increases with the increment of O3/NOX at a range from 1.6 to 2.0. The optimal operating conditions can be established when taking running costs and rigorous ultra-low emission standards into consideration. Under the optimal conditions, the removal efficiencies of NOX and SO2 reached more than 75% and 98% respectively, and CPM could be also controlled within 5 mg/Nm3.
Research of wastewater treatment from non-destructive detection by “wet oxidation-biochemical process-intelligence oxidation”
Authors: Haifeng Wang , Leiyu Feng
Published: July 2020

Non-destructive detection with colored-liquid was an effective detection method, which was widely used in non-destructive detection industry. High-concentration of wastewater with COD, color and surfactants would be produced in detection process. Through the biochemical treatment combined with wet oxidation, the COD dose would be reduced from 49200 mg/L to less than 100 mg/L. The color will be degraded from 5000 times to less than 40 times, which will match the requirements for reuse and discharge. Through the molecular distribution and bacteria toxicity test, wet oxidation reduced the inhibition rate of toxicity from 99.99% to 90.88%, which promoted the biochemical treatment performance. The average molecular weight of non-destructive wastewater was reduced obviously from 1486118 to 20376. In the end, the residual chlorine indicator was used to control dose of chlorine less than 3 mg/L to ensure that the color was less than 40 times and residual chlorine was not harmful to environment. The oxidation process was intelligence oxidation. The lab-scale experiment provided potential and available treatment process for non-destructive detection-wastewater.
Evaluation on the comprehensive degradation effect of photocatalytic pavement material on vehicle exhaust gas
Authors: Guo Yongmei , Jie Yadong , Shen Xinyuan
Published: July 2020

In order to evaluate the comprehensive degradation effect of photocatalytic pavement material on vehicle exhaust gas, the test samples were prepared by the spraying and mixing methods separately. The concentration variation of nitrogen oxide (mainly NO), hydrocarbons (HC) and CO was measured by using vehicle exhaust gas degradation test in the mixed input mode to simulate road working conditions, and the evolution law of each pollutant instantaneous degradation rate with time was analyzed. The results show that the concentration of each pollutant in vehicle exhaust gas will decrease by itself under ultraviolet (UV) radiation, but the speed is very slow, and photocatalytic pavement containing nano-TiO2 can play a significant role in improving degradation efficiency. The efficiency of photocatalytic pavement material to degrade different pollutants is unbalanced, so its comprehensive degradation effect on vehicle exhaust gas can not be reflected by the degradation evaluation index to a single pollutant. In this study, a new evaluation index suitable for vehicle exhaust gas degradation test in the mixed input mode is put forward, which called comprehensive degradation rate (CDR). Its value is the instantaneous comprehensive degradation rate (ICDR) when any pollutant appears degradation failure. This index can not only reflect the comprehensive degradation effect of photocatalytic pavement material on vehicle exhaust gas, but also show its maximum degradation capacity to each pollutant.
Study on Probability Model of Freezing Damage of Walnut’s florescence in Central and Southern Hebei Province
Authors: Shi Hairui , Sun Donglei , Xu Shuang , Hao Jufei , Yang Lina
Published: July 2020

Based on the surface meteorological data of 11 national meteorological stations in the main walnut producing areas of central and southern Hebei province from 1960 to 2017, three distribution functions, including normal distribution, Gumbel distribution and Weibull distribution functions are used to fit the minimum temperature of walnut flowering period, and a probability model of low temperature freezing damage is proposed. The results show that the commonly used probability model is not generally applicable to the freezing damage of walnut’s florescence; different sites of freezing damage of walnut blossom obeyed different probabilistic distribution, Weibull distribution model is more fitting to Gaocheng and Shexian than that of normal distribution fitting model, and the normal distribution model is much suitable for 9 sites such as Lianyuan than Weibull distribution model; comparing the stations in mountainous and plain areas, the mean value varies with the latitudes. The mean value of stations in the eastern foot of Taihang Mountains decreases with the increase of latitude. However, the mean value of stations in the Inner Hill is lower than that of other stations at the same altitude and latitude due to the influence of geographical topography and microclimate. Therefore, the probability of freezing damage is affected by both mean and standard deviation. The extreme weather is more likely to occur in Laiyuan, Inner Hill, Shexian and Gaocheng. The probability of low temperature occurrence is generally consistent with the altitude and latitude and it is also greatly affected by the geographical topography and microclimate.
Research on the general technical specification for biological filter for nitrogen
Authors: Jin Huang , hongxiang Ren , Xinlu Quan , ling Lin , Xiaoxin Zhang , Hui Huang , Dongyu Lu
Published: July 2020

Biological filter for nitrogen removal is a new technology of wastewater treatment, which combines biological denitrification and physical filtration. In this paper, the operation status of biological filter for nitrogen removal at home and abroad, the necessity of developing the general technical specification of biological filter for nitrogen removal, and the general technical requirements of biological filter for nitrogen removal are described. Through the application of the research results of the general technical specifications of nitrogen removal biofilters, it is expected to promote the operational efficiency of China’s nitrogen removal biofilters and achieve significant economic, social and environmental benefits.
Forecasting Rainfall with Recurrent Neural Network for irrigation equipment
Authors: Zhou Junyu , Zhang Yubin , Tian Si , Lai Shangding
Published: July 2020

The irrigation decision-making system based on Knowledge-based Engineering (KBE) can accurately predict water requirements and realize smart irrigation. Recurrent neural network(RNN) model have recently showed state-of-the-art performance in this system. This paper deals with the problem of long-term rainfall forecasting based on this network which predicts target rainfalls based on contextual information. A novel recurrent neural network with long short term memory(LSTM) is put for model sequence process for forecasting rainfall. Back-propagation through time(BPTT) algorithm is described for updating recurrent network’s weights. Extensive empirical comparison with three networks, Feed-forward neural network (FNN), Wavelet neural network(WNN) and Auto-regressive Integrated Moving Average(ARIMA), are also provided at various numbers of parameters and configurations. Simulation results demonstrate that the recurrent model with LSTM, trained by the suggested methods, outperforms the others networks.
Numerical Simulations to Optimize the Factors Affecting Particle Removal in a Double-storey Sedimentation Tank
Authors: Zhang S , Wang R H , Xu J J
Published: July 2020

The Euler model was used to simulate the solid-liquid two-phase flow in the double-storey sedimentation tank, and the effects of length and depth proportion of upper and lower storeys on hydraulic state, particle sedimentation, and turbidity removal effect were revealed. The results show that when the length is moderate and the proportion is close to one, the particle concentration at the outlet is relatively small and the difference in flow ratio is small, which basically meets the design. With the reduction of the length, it is difficult for the concentration of the suspended matter in the rear section to settle effectively. When the length is further increased, the solid particles have basically settled to the bottom before reaching the rear. When the proportion of the upper and lower stories is different, the water depth is greatly different, and the flow ratio is greatly different. When the depth of the upper storey is small, the particles deposited on the upper partition have a greater impact on the water quality of the outlet. When the depth of the lower storey is small, the overflow flow is reduced and the velocity is large, which is not good for the sludge deposition.
Growth and nutrient characteristics of Pinus massoniana in a Southern red soil
Authors: Yishan Chen , Qiaoling Zhang , Liujun Feng
Published: July 2020

The aim of the present study was to provide a reference that could facilitate vegetation restoration activities in Southern red soil regions of China. We investigated the growth and nutrient characteristics of Pinus massoniana. We measured plant heights and diameters at breast height and collected organ samples in three plots in Huangnikeng in Zhuotian Town, Changting County, Fujian Province. There were mostly positive correlations among all Pinus massoniana growth indices, although the correlation between plant height and leaf biomass was negative. Conversely, nutrient concentrations among Pinus massoniana bark, trunk, leaves, branches, and roots differed greatly. The C concentrations of various Pinus massoniana organs were ranked as leaves > bark > branches > trunks > roots; N concentrations, leaves > roots > branches > bark > trunks; P concentrations, leaves > roots > branches > bark > trunk; and K concentrations, roots > leaves > bark > branches > trunk. C:N, C:P, C:K, and N:P were significantly different in different Pinus massoniana organs. The results suggest that the biomass of each organ in Pinus massoniana decreased in the order of trunk, branch, roots, and leaves, and the nutrient concentrations decreased in the order of leaves, roots, bark, branch, and trunk.
One-step co-deposition mussel-inspired PEGylated polyvinylidene fluoride (PVDF) membranes: robust surface adhesion stability and enhanced anti-protein fouling property
Authors: An Z H , Cao W Q , Wang H Z , Ruan G L
Published: July 2020

Membrane surface design, especially for the anti-protein fouling property, is vital for the development of synthetic polymer ultrafiltration membranes. Although mussel-inspired antifouling coatings have obtained rapid development, the surface chemical adhesion stability still suffers from weak chemical stability especially in strongly alkaline environment. In this paper, the surfaces of polyvinylidene fluoride (PVDF) membranes were modified via traditional polydopamine (PDA) coating followed with polyethylene glycol (PEG) immobilization method and PDA/PEG one-step co-deposition strategy. In contrast to general PDA coating, the fabricated membrane surface exhibits excellent chemical adhesion stability under the different solution environment (whatever in neutral deionic water solution, acidic solution (pH=2) or strongly alkaline solution (pH=14)). The membrane surface elementary composition and morphologies were evaluated by X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). The modified membranes obtained via one-step codeposition were confirmed to have excellent hydrophilicity, enhanced coating stability and good dynamic/static anti-protein adhesion properties. Overall, this work provides a facile, robust and useful bio-inspired anti-fouling membrane surface modification strategy for broadening the application in water treatment field of ultrafiltration membranes.
Theoretical study on the ozonolysis of α-humulene in the atmosphere
Authors: Liu Jia’shuo , Lv Guochun , Xu Luyao , Zhang Danna , Peng Hengjun , Sun Xiaomin
Published: July 2020

α-Humulene is a major sesquiterpene which is produced by plants and can easily react with ozone in the atmosphere. The ozonolysis mechanism of α-humulene in the atmosphere was investigated by density functional theory and calculated rate constants using transition-state theory in this paper. In the ozonolysis of α-humulene, primary ozonides (POZ) are first formed after an addition reaction. Then, with the broken O-O bond, Criegee intermediates (CIs) are formed. The results discussed the subsequent reaction of CIs in detail, including the formation of secondary ozonide (SOZ) and the reaction of CIs with H2O. For the formation of SOZ, the path of SOZ6 is the best path in all six paths, with a low energy barrier (3.80 kcal mol−1) and high total rate constants (3.34 × 108 s−1) at 298 K and 1 atm. For the reaction of CIs with H2O, the production of P6 is the best path in all six paths, with a low energy barrier (9.87 kcal mol−1) and high total rate constants (9.58 × 10−11 cm3 molecule−1 s−1) at normal temperature and pressure. This work provides reaction mechanisms of the ozonolysis of α-humulene and finds the reliable paths in the subsequent reactions.