bluuebunny/crossref_metadata_2025_split huggingface dataset:
Characterization of combustion behavior of commercial flame-retardant plywoods in fire propagation apparatus
Authors: Qiu Tingting , Zhang Xueling , Lu Shouxiang , Zhang Guoan , Hou Lijun 
Published: February 2022

Abstract
This paper deals with the combustion behavior and thermal decomposition of two typical kinds of plywoods used in composite floor. The experimental study was performed in fire propagation apparatus and combustion parameters including ignition time, heat release rate, mass loss rate and effective heat of combustion were analysed. The results show that the risk of ignition and heat release of alder is higher than that of Huang Jin Guo Mu under most heat fluxes. Three thermal decomposition stages are proposed according to the characteristics of mass loss rate and temperature profiles. The present work provides input parameters for numerical modeling and gives guidance for fire risk assessment of rail transit.
Effects of upstream shear flow on performance and flow characteristics of the drag-type hydrokinetic rotor
Authors: Cao Qian , Kang Can , Peng Shan , Zhao Bo , Zhang Wenbin 
Published: February 2022

Abstract
Effects of the incident shear flow on operational performance of a drag-type hydrokinetic rotor were investigated numerically. A flow visualization experiment was conducted to validate the numerical method. Energy conversion ability of the rotor under different incident shear flow conditions were analysed. The effects of the tip speed ratio were also taken into consideration. The results show that under the incident shear flow conditions, the upstream flow inclines downward and the velocity magnitudes at the upper and lower side of the rotor are significantly different, which affects the operation of the rotor. As the shear coefficient increases, the azimuthal angle range corresponding to the negative torque coefficient reduces and the fluctuation of the torque coefficient with the azimuthal angle appears delay phenomenon. The tip speed ratio has a great effect on the flow patterns around the rotor. The shape and position of the flow structures downstream of the rotor vary obviously with the tip speed ratio. The results are anticipated to provide sound support on the design and optimization of the drag-type hydrokinetic rotor in actual condition.
Exploring the promotion method and pathway of energy big data service business
Authors: Yan Qibo , Ji Huiqiang , Chen Jingcheng , Wang Xudong , Gao Yi , Zhang Xiaochun , Wang Yongli , Zeng Ming 
Published: February 2022

Abstract
In the wave of China’s new energy revolution and digital revolution, advanced information technologies such as big data, cloud computing, Internet of Things, mobile Internet, and artificial intelligence have been deeply integrated with the energy industry, and energy big data has emerged as the times require. Energy big data promotes new models and new formats in the energy sector. The vigorous rise of energy big data has injected new impetus into the energy transition. With the explosive growth of energy data and the continuous improvement of data processing capabilities, energy big data has become a new element of social production, and different social entities have corresponding business needs. Therefore, this article is based on the three basic business promotion theories of growth cycle, growth framework and growth strategy with growth hacking theory as the core, and considers the different characteristics of government, enterprises and residents in terms of customer acquisition cost and life value. Finally, this article puts forward energy big data service business promotion models for governments, enterprises and residents which are based on the five stages of the user life cycle.
Design of utilization cold energy and economic analysis on LNG carrier
Authors: Zhang Xiaorong , Yue Rongqin , Li Boyang 
Published: February 2022

Abstract
Based on the principle of energy cascade utilization, this research uses 147000m3 LNG carrier as the research object. According to the principle of energy cascade utilization, LNG cold energy is applied to Rankine cycle power generation, ship desalination, ship low-temperature cold storage, ship high-temperature cold storage, ship air conditioning and nitrogen production, etc. Design a set of LNG cold energy comprehensive utilization system. Using Aspen HYSYS software for simulation, after analysis and calculation, the feasibility of the system design scheme was demonstrated. According to the route of the parent ship and the operating conditions of the cold energy utilization system, calculate the electricity and economic benefits saved by the LNG cold energy utilization system in each month. Through calculation, it can be known that 1.886×106 kW·h of electricity can be saved in one year, resulting in a benefit of more than 4 million yuan. The results show that the cold energy utilization system can bring good economic benefits and is worthy of promotion and application on ships.
Global LNG market: supply-demand and economic analysis
Authors: Zou Qian , Yi Chenggao , Wang Keming , Yin Xiuling , Zhang Yongwei 
Published: February 2022

Abstract
The transition to clean and low-carbon energy is an irresistible trend globally that drives the scale of trade in the global LNG market to grow continuously. The paper reviews the global LNG trade in 2020 and forecasts the future LNG supply and demand. On this basis, the costs in segments of a LNG project are analysed from the perspective of the LNG industry chain. The feasibility of export from LNG projects and the preferred target markets are determined by calculating the economic index of projects. It is concluded that the possibility of future rebound in oil prices and the demand growth in the incremental market in emerging Asian countries are most likely to determine the capacity scales of new LNG projects around the world and contribute to a dynamic balance in the LNG market in the medium- and longterm. The costs in different segments of the LNG industry chain vary greatly with the availability of resources and markets. The economics of LNG export depend on the demand for LNG imports in end markets, the cost plus in different segments of the industrial chain, and the affordability of end consumers. Through the cost and economic analysis on typical LNG Projects, Qatar is found still the most economical and highly profitable country in the global LNG export market nowadays. Unsatisfactory economic performance is a common reason for delayed investments in many large LNG projects in Australia and other countries.
Impact of re-electrification on energy and environment in residential sector: towards 2030 carbon peak for Yunnan
Authors: Wang Peng , Cheng Beibei , Li Qiushuo , Zhu Xianwen , Li Kangyan , Xie Yanjun , Shu Jie 
Published: February 2022

Abstract
The energy consumption of the residential sector accounts for about 20% of the total energy consumption of the whole society, and the energy consumption in the residential sector increases year by year, becoming the main growth source of carbon emissions. In this study, scenario analysis method is used to analyze the energy consumption, carbon dioxide emissions and pollutant emissions of residential sector in Yunnan Province from 2019 to 2035. The results show that in the scenario of deep re-electrification, the carbon emission of residential sector can reach the peak in 2029. At the same time, it can bring the collaborative emission 65% reduction of NOx and SO2.
An impact of solar PV specifications on module peak power and number of modules: A case study of a five-bedroom residential duplex
Authors: Mayokun Abolarin Sogo , Babale Shitta Manasseh , Aghogho Emmanuel Metuaghan , Precious Nwosu Blessing , Chucks Aninyem Michael , Lagrange Louis 
Published: February 2022

Abstract
This paper presents a case study using an analysis of solar PV modules peak power to determine the optimum number of PV modules required to supply energy to certain typical household appliances. The approach could be used for selection of solar PV modules that produce a satisfactory energy yield to meet pre-determined energy needs. In the analysis, the maximum daily energy consumption values corresponding to the lighting and air-conditioning loads were determined through an energy audit conducted on a residential building unit in Lagos, Nigeria. The maximum daily energy consumption values of these appliances were programmed into a NCEEC_e-EASZ VBA simulation tool to determine the solar PV array peak power and the number of modules required to produce the required solar energy yield. The methodology was validated with literature and HOMER Pro software. Eighteen different commercially available modules spanning a range of specifications including unit peak power varying from 280 to 400 W were investigated in order to select the most suitable panels for the provided conditions. The minimum required number of PV modules required to make up an array to produce the required yield was determined. The result indicates that when the unit peak power of the modules increases, the number of modules required to meet the daily energy demand reduces. The rating of solar PV modules between 280 - 400 W constituted a significant role in the process of analysing peak power as well as the quantity of solar PV modules required.
A study on resource reallocation in regional energy networks based on the adjustment of supply and demand nodes
Authors: Zhou Xichao , Cong Lin , Li Na , Zhu Haifeng 
Published: February 2022

Abstract
In this paper, we propose and analyse a regional energy network resource allocation scheme and optimization model for regions where the number of energy supply nodes grows seasonally, including the optimal division of the energy supply range of each energy supply node based on distance, the optimal path planning scheme of the energy pipeline network connecting energy supply and consumption nodes, and the optimal allocation/reallocation model of regional energy network resources with the objective of optimal operational economy. The proposed scheme for the optimal redistribution of regional energy network resources is used to analyse and study the case area, and a scheme for the division of energy supply nodes in the case area, a scheme for the construction path of energy pipeline network and a planning strategy for the optimal redistribution of energy network resources are developed to verify the feasibility of the method in this paper.
Operation-related features of diesel fuel injection systems at pressures up to 400 MPa
Authors: Zhao Jianhui , Grekhov Leonid , Denisov Alexander , Onishchenko Dmitry 
Published: February 2022

Abstract
The interest in the high pressure injection in diesel engines continues to grow. Optimal injection pressure is a function of the engine parameters and its application and is open to question. The study investigates the injection features of diesel fuel at pressures above 300-400 MPa. The injection pressure level, at which the fuel flow through the nozzle ceases to grow, was experimentally determined, and an improved simulation method for the heavy fuel injection modelling was proposed.
Research on optimization of annealing process based on N-type TOPCon solar cell
Authors: Gu Na , Ji Xiaofeng 
Published: February 2022

Abstract
In recent years, developing new structure and technology has always been an important link in the production and manufacture on photovoltaic cells. Among all high-efficiency crystalline silicon solar cells, the tunnel oxide passivated contact (TOPCon) solar cell has attracted much attention due to its excellent passivation and compatibility with the traditional crystalline silicon solar cells. This article first introduces the basic structure and process route of the tunneling oxide passivation contact (TOPCon) solar cell. Then the annealing process was studied. Experiments on the effects of different annealing temperatures and times on the doping characteristics were carried out, and the experimental results were analyzed. The experimental results show that the annealing temperature and time have a very important effect on the annealing effect of ion implanted silicon. Finally, the light injection annealing process is researched and experimented. Experimental results show that the efficiency of the light injection annealing method is significantly improved, which is mainly manifested in the improvement of Voc (open circuit voltage) and FF (fill factor).
Numerical simulation research on the fire in cable cabin of utility tunnel with different longitudinal fire source locations
Authors: Geng Dewang , Cao Bei , Zhou Xiaodong , Liu Hong , Lu Ziping , Yang Lizhong 
Published: February 2022

Abstract
A full-scale model was established by the Fire Dynamics Simulator (FDS) to study the fire characteristics in the cable cabin of utility tunnel with different longitudinal fire source locations. Five fire sources at different locations were placed in a 200-meter-long fire compartment. Several important parameters were obtained and analyzed, including temperature distribution, smoke concentration, and fire self-extinguishing. The results present that the fire source located at 1/2 of the longitudinal direction has the largest range of high-temperature smoke, which leads to the largest damage range of the concrete structure. The reverse filling of the smoke in the utility tunnel leads to the longitudinal CO peak concentration first decreasing and then increasing from the fire source to the end. When the fire source is located at 1/8 of the longitudinal direction, the fire self-extinguishing time is the longest. These encouraging results could provide significant references for the fire protection design and fire control of the utility tunnel.
The influence and optimization of air distribution method on the boiler burns high-sulfur coal
Authors: Liu Honggang , Lu Shaobo , Song Zhiyu , Liu Xiu , Wang Ning , Han Jiting , Zhao Mingliang , Jiang Weiwei , Guo Shuai 
Published: February 2022

Abstract
A large amount of H2S will be generated during the operation of power plants mixed combustion with high-sulfur coal, causing high-temperature corrosion of the boiler water-cooled wa ll. In order to prevent it from pipes bursting due to high temperature corrosion during the operation of the unit, Air distribution was adjusted on a 350MW subcritical pulverized coal combustion boiler, especially for the opening of the secondary a ir valves of each layer of the burner, so as to reduce the volume fraction of H2S in the furnace and lower the corrosion of the water-cooled wall. The research results show that by adjusting the a ir distribution, the volume fraction of CO and O2 in the flue gas of the furnace is changed, and at the same time, it also has an influences on the change of the flue ga s temperature in the furnace, a nd effectively inhibits the generation of H2S, a lleviating the high temperature corrosion of water wall.
Study on the variation law of hydraulic jump values of pumping well in the loess aquifer
Authors: Zhang Xuezhen , Huo Aidi , Wang Jucui 
Published: February 2022

Abstract
This study aimed to investigate the influencing factors for the water jump and the research status of the solution. Using the in-situ pumping test, the analytic solution method, the curve-fitting method, and the method for determining the water-level difference of the main and auxiliary wells were put forward to calculate the characteristics of the water jump under the condition of constant flow. The water jump values obtained by different methods were compared. The duration change of the water jump value under three constant-flow pumping conditions was analyzed. Also, the relationship between the water jump value and the duration of the flow rate under three unstable flow conditions was examined. The results showed that, with reference to the analytical solution of the jump value, the value calculated by the difference method of primary and secondary water levels was about 17% and that calculated by the curve-fitting method was about 10% under the condition of constant-flow pumping. When the pumping amount increased to a certain value, the jump value was stable in a certain period of time. When the pumping volume increased to a certain value, a linear relationship was found between the pumping volume and the water jump value for a certain period of time under the condition of unsteady-flow pumping, but this relationship did not repeat completely. The results showed that it was difficult to calculate the magnitude of the water jump under the in-situ test strip. Further, the method for determining the water-level difference between the main and auxiliary wells could be used to approximate the water jump of the pumping well. It was confirmed that a linear relationship existed between the water jump value of the main well and the pumping amount under certain conditions during the pumping process. This linear relationship was affected by various factors and did not always exist.
Research on construction method and information system of double prevention mechanism in iron mine
Authors: Liu Yejiao , Teng Ting , Chen Ying , Xing Hui , Cui Yinuo , Zhang Peng , Wang Puxian 
Published: February 2022

Abstract
At present, there are many problems in the construction process of the double prevention mechanism in iron mine, such as unclear construction steps, disconnection of construction process, and deviation of construction priorities, et al. Based on the PDCA cycle mode and the improved risk assessment method for working conditions, the construction method of double prevention mechanism in iron mine is analyzed and studied. The yaahp meta-decision software (Analytic Hierarchy Process software) is used to determine the weight of hazardous factors and their corresponding control measures.The concept of “failure frequency” is put forward and the calculation method of accident probability (L) is modified to realize the accurate hierarchical control of accident risk; At the same time, the failure of control measures is defined as “hidden danger”, and then the transmission mechanism of hidden danger investigation and management and risk grading management and control is established.The “Information management system of double prevention mechanism in iron mine” is developed by adopting the B/S structure to realize the informatization of the double prevention mechanism construction. According to the above methods and steps, the double prevention system of iron mine can be reasonably established to effectively identify risks and control hidden dangers and provide favorable guarantee for the safe production of iron ore.
Ice thickness estimation method of overhead line based on distributed optical fiber temperature sensing
Authors: Zou Xiaoming , Liu Xinzhan , He Yi , Lan Yingbin , Yang Liuhui , Zhao Lijuan 
Published: February 2022

Abstract
In order to monitor icing condition of overhead line based on distributed optical fiber temperature sensing, the transient temperature field models of radial and axial heat transfer for iced overhead line are constructed. The finite element method is used to solve the model to obtain the axial and radial temperature distribution inside the overhead line. Based on the two models, the change of the optical fiber temperature with time when the ambient temperature changes at a certain rate is investigated. At the same time, the change of optical fiber temperature with time in the iced and uniced sections under different ice thicknesses is also investigated. On this basis, the change of temperature difference with time is investigated. The formula of ice thickness estimation according to the temperature difference between iced and uniced sections’ optical fibers is obtained. This work lays a foundation for the evaluation of ice condition of overhead line based on distributed optical fiber temperature sensing.
Research on influencing factors of cable traction force in horizontal directional drilling
Authors: Tang Jipeng , Qin Tao , Zhang Haiwei 
Published: February 2022

Abstract
Horizontal directional drilling and pipe pulling technology is playing an increasingly important role in power engineering applications because of its low social and environmental impact and high construction speed. However, due to the more complex urban underground pipeline environment and the uncertainty in the process of cable pulling and laying, in order to ensure the safe laying of cables and later operation, so the cable traction force verification in the process of pulling is particularly important. Relying on specific engineering examples and relevant regulations and specifications, the cable traction force formula in the process of pulling the tube is studied, modified and given its arc-making section equivalent model, the selection principle of the discriminative cable traction method, and the influencing factors affecting the safety coefficient of cable traction force are studied.
Study on disaster prevention system in key areas of urban forest park with multi-factor coupling-- Chengdu Longquan Mountain as an example
Authors: Zhou Xuehong 
Published: February 2022

Abstract
Urban forest parks are major ecological sites in the suburban areas of large cities with good forest vegetation and forest ecological environment, providing people with recreation, tourism, fitness and other suburban activities, and are an important component of the urban landscape system. The spatial density and development intensity of people, facilities and places in the park are higher than those in general forest areas, and the risk of forest disasters is high. To effectively prevent the occurrence of forest disasters and ensure the safety of touring, this paper takes Chengdu Longquan Mountain Forest Park as an example, and divides the key areas of the forest park into high risk areas, medium risk areas and low risk areas through coupled analysis of forest fire risk factors, forest pest risk factors and geological disaster risk factors, and builds a system of prevention, prevention, resistance and rescue for different risk levels. The system is a combination of prevention, resistance and rescue, with points leading to lines, and lines leading to surfaces, forming a disaster prevention system that combines “points, lines and surfaces”, with human, physical, technical and institutional prevention complementing each other, providing a model for reducing the risk of disasters and ensuring the health and safety of forest parks.
Identification for water quality based on color characteristics
Authors: Wang Jiangang , Zhai Zhengang , Zhu Yunya , Zhang Li , Fang Xusheng 
Published: February 2022

Abstract
It’s great significance for protection of water ecological and water resources to identify water quality rapidly and conveniently. In the past time, water quality was test and monitored with traditional laboratory methods, which was hard to meet the requirements of urgent demand. A rapid and convenient method for the identification of water quality based on machine learning was used in this study. By sampling and photographing, the image of water was acquired. Then nine dimensional digital information features of the color information were obtained by the moment method. Based on the historical data and expert experience, a support vector machine (SVM) model was successfully built and well trained. Then the model was verified with the test data, and the accuracy reaches 95%, which proves this method has good effect and high precision. This work will generate fresh insight into water quality identification and contribute to water resources protection.