bluuebunny/crossref_metadata_2025_split huggingface dataset:
Modelling flow and sediment transport change on the ecosystem in the large fresh water lake-Poyang Lake
Authors: Zhang Tao 
Published: March 2021

Abstract
River connected lakes exchange substances such as water and sediment with the rivers frequently, which means the ecosystem is significantly influenced by the relationship between the lake and the rivers. Affected by the construction and operation of the upstream reservoirs and the evolution of the climate conditions, the relationship between the lake and the rivers connected to Poyang Lake (PYL) has changed remarkably. The changed relationship has a direct impact on the inflow and outflow conditions of the water and sediment, which are most important state variables and driving variables in the aquatic ecosystem, specifically, the inorganic environment of an aquatic ecosystem is mainly composed of water and various forms of sediment and the transport of water and sediment drives the transport of nutrients and biological elements and forms the aquatic habitat. To study the impact of the flow and sediment transport change on the ecosystem in PLY, this study builds the food web model and simulates the evolution of the aquatic ecosystem by virtue of AQUATOX, which is a comprehensive eco-model developed by Environmental Protection Agency. The results illustrate there is a degeneration of the ecosystem in PYL when the sediment transport is decreased significantly, and the water discharge of Hukou is increased in dry season. In the 30 years’ simulation period, the biomass concentration of chlorophyll a increased significantly in summer and autumn, and the biomass concentration of benthos decreased significantly from 2012 to 2030.
Evaluation of the impact of water conservancy projects on the ecosystem of Poyang Lake
Authors: Meng Jianan 
Published: March 2021

Abstract
Energy engineering, such as hydroelectric stations, greatly affects the environment. Under the effect of the Three Gorges Dam, the water level of Poyang Lake has decreased. The dry season of Poyang Lake has become longer, leading to many consequences. The government proposed that a sluice be built in Poyang Lake to regulate the water level. We established AQUATOX model of Poyang Lake with different water flow in and out to simulate the ecosystem with changing water volume (water level). The data used in this paper are the output of the AQUATOX model. This paper proposes and uses a framework for ecosystem assessment of the body of Poyang Lake. The results show that the ecosystem quality of the body of Poyang Lake will become increasingly worse if no action is taken. If the necessary connectivity (for migratory creatures) is ensured, building a sluice can improve the ecosystem quality of the body of Poyang Lake. We also discusses the possibility of using ecosystem stability and regime shift indexes in ecosystem assessments.
Analysis of spatial structure and living culture of patio and courtyard dwellings in southern Hubei from the perspective of “cultural ecology” -- taking Ruijin Chuanfang ancient residence as an example
Authors: Huang Xinyi , Xu Hong , Xie Ning , Xu Mengya , Zhao Jin 
Published: March 2021

Abstract
The concept of cultural ecology is not only the basic requirement of self-innovation and self-protection of traditional culture, but also the effective response of traditional culture under the background of cultural crisis. From the perspective of cultural ecology, this study takes Ruijin Chuanfang ancient residence as an example to analyse the mutual adaptation between spatial elements such as spatial combination, functional distribution and construction structure of traditional folk dwellings in southern Hubei province and local unique cultural elements such as natural environment, economic environment and social environment.
Characteristics and source of soil selenium content in Zhangba Village, Lintong District, Shaanxi Province
Authors: Qiao Xinxing , Ji Huawei , Zhang Jijun , Li Aorui , Ren Rui , Chao Xu , Hu Kui 
Published: March 2021

Abstract
Soil selenium content affects the absorption and accumulation of selenium in crops and ultimately affects human health; therefore, it is of great significance to study the characteristics of selenium content in soils and crops. Based on the previous agricultural geological survey and research carried out in Lintong area, and combined with data of Second National Land Survey, the agricultural geological survey and evaluation at the village level was carried out in Zhangba Village, Lintong District. Distribution characteristics of soil selenium content in each plot and selenium levels in crops were analyzed systemically, and the causes and influence factors of soil selenium was preliminarily studied. This survey found that selenium content of the soils and crops in Zhangba Village all met the standard of selenium enrichment. This finding provides strong support for land resource planning and management and rational utilization of selenium-rich soil resources in this area, moreover, it is of great significance to adjust planting structure, improve land use value, and promote development of selenium-rich agriculture.
Estimation of exposure to polybrominated diphenyl ethers of people surrounding Nanjing Chemical Industry Park via fish consumption
Authors: Wu Jianfeng , Shen Mengnan , Cheng Jie 
Published: March 2021

Abstract
Nanjing Chemical Industry Park (NCIP) is an important industrial base with more than 300 chemical plants. Taking NCIP as a research area, this article conducted a random sampling survey on the aquatic product consumption of residents in the NCIP and its surrounding areas. Then this study preliminarily estimated the exposure level of local residents to polybrominated diphenyl ethers (PBDEs) associated with fish consumption. The mean intake of Σ6 PBDEs via fish consumption was 0.69 ng/kg body weight b.w./day with a range of 0.35-1.63 ng/kg b.w./day. There was no significant difference in total intake of PBDEs at different body weights. Among the six PBDEs congeners, BDE-47 was dominant in the total intake, with an average contribution rate of 77%. The daily exposure to PBDEs decreased with the increase of body weight. During this period, the total intake of PBDES through fish consumption was at a low level. Overall, the estimated daily intake of total PBDEs was far below the LOAEL for the population in this region.
Research on theoretical energy saving rate of cooling and heating with intelligent temperature control of office buildings in Xinjiang typical climate zone
Authors: Ni Pingan , Wang Wanjiang , Ji Wensi , Zhang Yaru , Yang Chongchong 
Published: March 2021

Abstract
At present, many office buildings in Xinjiang generally use continuous movement of heating and cooling systems, heating and cooling excessively caused the energy waste, the use of intelligent control equipment system can effectively save energy. This paper uses the parametric performance simulation toolset (Ladybug tools) to model the energy consumption of office buildings in four typical climatic regions in Xinjiang. It simulates two methods of intelligent control (ICS) and continuous operation (COS) in different window-to-wall ratio (WWR) the influence of heating and cooling energy consumption load. Considering the additional equipment energy consumption (ΔE) of ICS, the control energy saving rate (ƞ) is compared ICS with COS. The results show that in different climate zones and with different WWR, ICS is more energy-efficient at the heating and cooling methods than COS. Moreover, in different climate conditions, office buildings with different WWR have different energy-saving rates. The change of the WWR has a small effect on the η value in the Severe Cold Zone C, and the η value in the Cold Zone A region decreases with the WWR becomes larger. This study further proves that the contribution of intelligently controlled heating and air-conditioning systems of building energy conservation and provides a favourable basis for refined energy development.
Reasons analysis of the large deviation in the NOx emission data of the coal-fired power plant
Authors: Dong Ruifeng , Zhang Kai , Guo Yang 
Published: March 2021

Abstract
The problem of the large deviation in the CEMS (Continuous Emission Monitoring System) data of NOx emission from the coal-fired power plant is analyzed. The deviation existed between the data measured at the chimney and the outlet of the denitration system. On-site inspection and testing are carried out. The results show that the uneven distribution of NOx concentration at the denitration outlet caused by the uneven ammonia injection, is the main reason for the difference in the NOx concentration monitoring value between the chimney inlet and the outlet of the denitration system. Several suggestions are given to reduce the deviation between the CEMS monitoring data and the actual average data. In the subsequent operation of the denitration device, AIG ammonia injection optimization and adjustment tests should be carried out regularly. The ammonia injection branch pipes and nozzles should be checked, especially at the shutdown time.
Small Break Loss of Coolant Accident (SB-LOCA) fault diagnosis using Adaptive Neuro-Fuzzy Inference System (ANFIS)
Authors: Mwangi Mwaura Anselim , Yong-Kuo Liu , Ochieng Adede Simon 
Published: March 2021

Abstract
The detection of incipient faults of the current fault diagnosis systems in Nuclear Power Plants is inherently limited. Active research in machine learning algorithms like Adaptive Neuro-Fuzzy Inference System (ANFIS) is providing promising results in the prediction of faults. This paper explored four different configurations of Adaptive Neuro-Fuzzy Inference System (ANFIS) methodology in a bid to come up with a superior model that not only had a high sensitivity in the detection of incipient faults but also had superior prediction capabilities. The data-driven ANFIS schemes were used to predict a sensitive fault signature and to evaluate the models, Small Break Loss of Coolant Accident (SBLOCA) transient events were modeled in Qinshan I Nuclear Power Plant. Coefficient of determination, normal probability plot of residuals and mean absolute percent error were used to assess the competencies of the estimation of the models.
Quantitative assessment method of power grid disaster response capability based on fuzzy comprehensive evaluation and comprehensive weight1
Authors: Zang Bipeng , Xie Xiangpeng , Zhou Xia , Lu Jianqiang 
Published: March 2021

Abstract
To study the objective assessment of power grid disaster response capacity under extreme natural disasters, a quantitative assessment method of power grid disaster response capacity based on fuzzy comprehensive evaluation and weight is proposed. Firstly, a pre-disaster endurance and post-disaster resilience evaluation index system is established by analyzing the comprehensive data of the power grid system. Then, the analytic hierarchy process and the entropy weight method to obtain the subjective and objective weights of the indicators are used and combined into comprehensive weight determination indicators. Fuzzy comprehensive evaluation to quantitatively evaluate the disaster response capability of the power grid is used. Finally, the proposed evaluation method is verified through a calculation example. The results show that the method is reasonable and effective, and has a certain guiding role for the grid to respond to extreme natural disasters.
Effects of different nitrogen concentrations and light intensities on lipid accumulation and growth of Chlamydomonas reinhardtii
Authors: Zhao Yiran , Li Zhuoyuan , Tu Xiaomeng , Xu Lili 
Published: March 2021

Abstract
This study sets different nitrogen concentration gradients to explore the impact of nitrogen concentration on biomass and lipid accumulation of Chlamydomonas reinhardtii under different light intensities. The results showed that the conditions for the accumulation of lipid in the algae were 30μE-m-2-s-1 light intensity and 100 mg.mL-1 nitrogen concentration with the lipid content of C. reinhardtii was 39.79% and chlorophyll content was 17.08 mg.mL-1. This study provides an experimental basis for the regulation of lipid production of C. reinhardtii by using nitrogen-deficient culture and provides a foundation for further utilization of genetic engineering methods to regulate the lipid metabolism of C. reinhardtii.
Feasibility analysis on the coupling power system of municipal solid waste incinerator and coal-fired unit
Authors: Miao Shanshan , Wang Dehua , Yin Yaning , Han Shengli , Wang Ting , Li Chong , Huang Ying , Guo Xin , Wang Weilai , Yu Qiang , Zhu Yingwei 
Published: March 2021

Abstract
In this paper, the coupling capacity matching is related to chlorine content in MSW incinerator, denitrification and desulfurization efficiency of coal-fired boiler. Based on an 850 t/d municipal solid waste (MSW) incinerator and a 1000MW ultra-supercritical coal-fired unit, the effect of the dual-chain coupling of steam and flue gas on the coal-fired unit is studied, including corrosion of heating surface in furnace, dioxin emissions, pollutants emission, and fly ash comprehensive utilization. Through the influence research to the coal-fired boiler, it can be seen that influence on the heating surface is small at high temperature. The flue gas environment of coal-fired boiler can also inhibit the synthesis of dioxin and the flue gas of waste incinerator meet to the ultra-low emission standard of pollutants of coal-fired units and the heavy metals content of fly ash of coal-fired boiler is not hazardous waste. After the coupling, the generation efficiency of MSW incinerator can rise up from 20% to 31.6% and the MSW incinerators operate investment reduced by 40% with significant economic benefits. The coupling mode can be generalized of waste incinerator and coal-fired boiler that obtain feasibility for engineering application.
Numerical study on the different prevention methods for fire and smoke in utility tunnel fire
Authors: Cao Biteng , Yang Lizhong , Wang Hengdong , Xu Qiong , Li Bin 
Published: March 2021

Abstract
Series numerical simulations of fire in utility tunnel have been performed by Fire Dynamics Simulator (FDS) in this paper. The main purpose is to investigate the smoke prevention effect of fireproof door, water mist curtain, air curtain and ceiling screen. The pressure of water mist, airflow velocity of air curtain and the height of ceiling screen were considered. The results show that once a fire occurs in the pipe corridor, fireproof door has a good effect of smoke preventing and cooling. The water mist curtain, air curtain and smoke ceiling screen systems all have a blocking effect on fire and smoke, and the best fire smoke prevention parameters of water mist curtain and air curtain applied in underground comprehensive pipe gallery are 10 MPa and 10 m/s respectively. Therefore, the fireproof door, water mist curtain and air curtain systems can be set in pipe gallery to prevent fire and smoke, so as to improve evacuation safety and emergency rescue efficiency.
Calculation of environmental capacity and pollutant discharge in Changxing county based on sustainable development
Authors: Wu Jianfeng , Wang Junmin , Fu Lei , You Aiju 
Published: March 2021

Abstract
Due to the improvement of the understanding of the natural environment and social service function of rivers, many countries in the world have started the research and practice of water environment protection. Lots of Chinese cities also paid most of their attentions to the water environment especially in the river network area. Systematic calculation and analysis of the water environment status becomes famous in most of the Chinese cities, which not only shows the current status of water environment but also indicates the methods to reduce the domestic pollution. In this study, Changxing county is selected as a typical Chinese city, COD (Chemical Oxygen Demand) and TN (Total Nitrogen) are considered as two typical pollutants, both water environmental capacity and current pollution are calculated. From the comparison between the present pollution load and the discharge limit into the river, it can be seen that TN is the key influencing factor of the water environment carrying capacity in Changxing County, and its overload ratio is up to 5.0. A series of measures to reduce the pollution load into the river are put forward in order to provide an auxiliary decision-making basis for further protecting “clear water and green mountains”.
The wind-PV-hydro-thermal multi-source cleaning dispatch with the influence of super-power thermal storage boiler
Authors: Ge Weichun , Liu Debao , He Huan , Wang Shunjiang , Jiao Zhen , Zhao Xuanyuan 
Published: March 2021

Abstract
Aiming at the problem of serious waste of clean energy caused by the randomness and volatility of clean energy output during the winter heating period in Northeast China, this paper proposes a dispatching scheme of super-large power regenerative electric boiler, which fully combines the different physical characteristics and respective advantages of power systems and thermal systems. To maximize the economic and environmental benefits of wind-PV-hydro-thermal and other multi-energy joint dispatching, an optimal dispatch model is constructed with the lowest overall power generation cost as the dispatch target considering the power generation operating cost of the thermal power unit, the cost of abandoned light, the cost of abandoned water, the cost of abandoned wind, and the heating income of super-large power storage boilers combined together. The improved PSO algorithm based on multi-agent is used to solve the model. The results of the calculation example show that, after considering the absorption capacity of the super-large power regenerative electric boiler, the operating cost of the system is reduced by about 10%, and under the premise of ensuring the safe and stable operation of the system, the utilization rate of clean energy utilization and the system operation economy is improved.
Effect of goods stacking mode on temperature field of cold storage
Authors: Tang Yanlin , Hu Zuoxin , Tang Tianyu , Gao Xin 
Published: March 2021

Abstract
The distribution of temperature field in cold storage is affected by different stacking patterns of goods. To explore the influence of goods stacking way on cold storage temperature field, computational fluid dynamics (CFD) was used to simulate the influence on temperature flied of cold storage by different types of stack arrangement methods under a new air outlet design way in this article. The three types of stack arrangement included stacking along the X axis, along Z axis, and along Z axis with 10cm thick dunnage board. The simulation result shows that the temperature distribution inside the cold storage is the most uniform when goods are stacked along the Z-axis and filled with 10cm thick dunnage board. The simulation on this type of arrangement well agreed with measured results. This work would give out research reveal the features of the temperature distribution in cold storage with vent series. This would be helpful on design of the cold storage and the stack arrangement.
Evaluation of carbon dioxide storage in the deep saline layer of the Ordovician Majiagou Formation in the Ordos Basin
Authors: Lu Ping , Liu Weigang , Gao Chunyun , Zhao Junhui , Bai Yong 
Published: March 2021

Abstract
Geologic CO2 storage (GCS) is one of the preferred solutions to reduce greenhouse gas emissions. Comparing with other geological reservoirs, the deep saline aquifers have huge storage potential and currently the most promising one. Since technical and economical viability of geologic CO2 storage depends highly on the CO2 storage capacity, this paper mainly uses the storage mechanism method to estimate the CO2 storage capacity of the Ordovician Majiagou Formation in order to give data support for GCS project in the Ordos Basin. The results show that the total effective CO2 storage capacity of the deep brine layer of the Ordovician Majiagou Formation in the Ordos Basin is 15.98-109.22Gt. The Majiagou Formation has sufficient storage capacity to accommodate decades of CO2 emissions generated by multiple coal-fired power plants in the Ordos Basin. For CO2 geological storage, the structural trapping mechanism contributes the largest amount of CO2 storage, and the amount of CO2 storage contributed by the two mechanisms of bound gas trapping and solubility trapping is almost negligible. The above results provide methods and references for CO2 estimation of GCS project in this region, and provide data support for the site selection and injection of CO2 sequestration in deep salt layers of the Ordos Basin.
PWM rectifier impedance modelling and analysis
Authors: Bie Yiyuan , Li Yang , He Guoqing , Zhang Xing 
Published: March 2021

Abstract
PWM rectifiers are widely used in the field of new energy power generation. The study of small signal impedance modeling of PWM rectifier is helpful to analyze the stability of new energy grid connected impedance. In this paper, the small-signal impedance model of the PWM rectifier is first established, and then the impedance model of the PWM rectifier is scanned through MATLAB using the impedance sweep method, and compared with the analytical expressions in this paper, the accuracy of the impedance model of PWM rectifier established in this paper is verified.
Research on bidding mechanism and strategy of hydropower unit based on coupling resources
Authors: Ding Wenjiao , Lu Zhanhui , Wang Bangcan , He Peishan , Liu Yu , Liu Runze , Jing Zhaoxia 
Published: March 2021

Abstract
The construction of the electric power spot market in China is at an initial stage, and there is a contradiction between the bidding mode of single-unit bidding and the physical operating characteristics of cascade generating units. When all generators in the market make price declarations and settlements independently, the dispatching and clearing results may violate the operating performance of the actual units, bring difficulties to the unit joint bidding, and at the same time cause serious deviations in scheduling and waste of actual resources. Therefore, for the power generation resources coupled with resources such as cascade hydropower units, this paper proposes a bidding mechanism based on aggregation nodes. First, the bidding mechanism and bidding strategy of the aggregation node is introduced in detail, and then the spot market-clearing model of the aggregation node bidding is established. Finally, the IEEE5 simulation shows that the bidding mechanism based on the aggregation node can make the market-clearing result reflect the unit’s willingness to trade, effectively allocate cascade hydropower generation resources, and improve market transaction efficiency.
Control method of power grid topology structure based on reinforcement learning
Authors: Yang Yanhong , Pei Wei , Deng Wei , Xiao Hao , Sun Hongjian 
Published: March 2021

Abstract
With the rapid development of renewable energy and power electronics technology, uncertainty, complexity and data accumulation in power system continue to increase. Traditional methods often encounter bottlenecks in solving operational optimization decision-making and control problems. The development of artificial intelligence technology provides new methods and means for solving the problem of intelligent control of power grid topology. The deep reinforcement learning (DRL) method is used to learn from the historical experience data of power grid topology control that can improve the control and decision-making and methods of system operating performance, and solve the huge variables in traditional models. Through the method in this paper, the DRL method can effectively improve the real-time optimization and control ability of the grid topology.