bluuebunny/crossref_metadata_2025_split huggingface dataset:
Multi-domainsdispatching method for power system considering energy storage
Authors: Ge Weichun , Liu Debao , Liu Tao , Wang Shunjiang , Liu Junfa , Hu Lei 
Published: March 2021

Abstract
Reasonably arranging the matching of power sources is an effective mean to improve the capacity of new energy consumption. Using the dispatching characteristics of the transferable load of the energy storage systems can play an important role in the actual dispatch of the power system. From the perspective of flexible scheduling, a multi-domain scheduling method is proposed, which comprehensively considers the influence of factors such as load, wind power output random fluctuations and system adjustment capabilities, and redistributes it into three control domains. That is, the normal control domains with the goal of completely absorbing wind power, anomaly control domain where the energy storage systems needs to be used to absorb wind power, and the emergency control domain where there is no regulation ability and forced to abandon wind. To maximizing clean energy consumption, CPLEX software is used to optimize output and realize multi-domain green economic dispatch. The calculation example shows that this method can effectively improve the absorption capacity of clean energy.
Prospects of functionalized porous materials towards extraction of spent nuclear fuel radionuclides
Authors: Ochieng Adede Simon , Zhang Meng , Li Yaori , Mwangi Anselim Mwaura 
Published: March 2021

Abstract
Radioactive waste levels have continued to increase due to the growth and development of nuclear energy, industrial or medical radioactive use. In this regard, conventional radioactive waste generated by nuclear power plants cannot be ignored. Effective management of nuclear radioactive waste plays a vital role in alleviating negative impacts on the society and environment. Despite the progress that has been made concerning separation and recycling of spent nuclear fuel through the PUREX process, several gaps in knowledge still exist especially towards the development of a robust separation system based on solid-phase extraction using porous materials. Solid phase extraction is being viewed as one of the most convenient and effective approaches in the removal of cations in radionuclide solutions. This is due to its ability to increase the selectivity and sensitivity of the method as it permits discriminatory binding of analyte to a solid support where the analyte can be collected and thereafter eluted using small quantity of a different solvent. The review covers the current methods used in aqueous nuclear reprocessing, highlights their deficiencies and introduces the potential of applying solid-phase extraction in management of nuclear waste. This study gives the prospects of functionalized porous sorbent materials as solid support in solid-phase extraction of spent nuclear fuel elements.
The techno-economic evaluation of school integrated energy system based on G1-anti-entropy weight-TOPSIS method
Authors: Zhao Qingqi , Yu Changle , Liu Jun , Zhu Yuanda , Yang Lin , Zhao Hui , Wang Huaijian , Gao Shuyi 
Published: March 2021

Abstract
Scientific and reasonable evaluation system and method of technical economy are helpful to improve the technical economy of integrated energy system (IES). This paper analyzes the energy flow of the school integrated energy system (SIES), and constructs the techno-economic evaluation index system of the SIES from three aspects: technology, economy and environment. The evaluation index includes qualitative analysis index and quantitative analysis index. The techno-economic evaluation model of the SIES based on the G1-anti-entropy weight-TOPSIS method is constructed. The evaluation model reflects the subjectivity and objectivity of evaluation. It also overcomes the problem that the AHP method needs consistency test and high sensitivity of entropy weight method leads to the failure of index. Finally, a case study is conducted on a school in northeast China. The results of the analysis verify the feasibility of the evaluation index system and evaluation method. The evaluation system and evaluation method proposed in this paper can provide reference for the selection of SIES construction and operation plan.
Minimum reactive power loss optimization of power grid systems based on improved differential evolution algorithm
Authors: Xie Yejun , Liu Zhendong , Pan Yongchao , Li Fei , Jiao Taiming , Li Xiaojuan 
Published: March 2021

Abstract
With the expansion of power system scale, the operation of the power grid system has been greatly challenged. Reactive power optimization can make the power system operate safely and economically. In this paper, an improved differential evolutionary algorithm is applied to reactive power optimization of power system. We take the minimum power system loss as the objective function, the power balance condition as the equality constraint, the control variables and state variables as the inequality constraint conditions to establish the system model. Finally, IEEE30 bus and IEEE33 bus power system are selected to verify the effectiveness of the proposed algorithm.
Two-stage planning optimization of multi-scenarios integrated energy system considering energy reliability
Authors: Yu Changle , Zhao Qingqi , Liu Jun , Zhu Yuanda , Xu Minghu , Xu Haoran , Gao Shuyi , Wang Huaijian 
Published: March 2021

Abstract
The pace of economic society and globalization is accelerating, and the energy shortage and environmental pollution is increasing relatively. In order to comprehensive utilizing energy, this paper constructs an Integrated Energy System (IES) with electricity and gas in and electricity, cooling, and heat out, and solves the optimal configuration of this energy system through a two-stage planning optimization model. First, the two-stage planning optimization model based on particle swarm optimization (PSO) is established, and the capacity configuration plan of energy device is solved by the first stage. Then, Rayleigh probability distribution model is used to describe the uncertainty of wind power output, and two device reliability indicators are proposed to be added to the constraints. Finally, the objective function of the second stage is solved to obtain the optimal operation plan, and the planning optimal results of IES is obtained by repeated iterations of the two stages. Considering the energy storage devices, the Industrial and Living-official scenarios of IES are simulated and the results show that the proposed model is available to different scenarios and can reduce the costs of the energy system effectively and make sure the energy supply reliably.
Research on deployment method of edge computing gateway based on microservice architecture
Authors: Zhang Hai , Liu Zhengyi , Zhang Yaoyao , Zhan Shuguang , Yang Jianjun , Wang Guixiang , Sun Yufei 
Published: March 2021

Abstract
Traditional solutions that use servers or computers to deploy on-site are bulky and costly. The edge computing system can be deployed in a lightweight and flexible manner according to the actual needs of the site, so as to achieve the lowest cost while meeting the functional requirements. Based on this, this article proposes an edge computing system solution based on microservice architecture, discusses the overall framework of the system and the implementation of microservice architecture in edge computing systems, and introduces in detail an edge computing gateway device deployment method based on the Gaussian mixture model, which can optimize the number of deployed gateway devices while ensuring the load balance of each gateway device. Finally, the advantages of the deployment method are verified through experiments.
Flow characteristics and operation performance of the drag-type hydrokinetic rotor: a systematic review
Authors: Zhao Hexiang , Kang Can , Ding Kejin , Li Bing 
Published: March 2021

Abstract
The hydrokinetic rotor serves as a critical component in the system of hydropower utilization. Advantages of the drag-type rotor have been recognized while the disadvantages of low efficiency are appreciable. To improve the performance of the drag-type rotor, studies have been performed from multiple aspects. The present study summarized recent achievements of this rotor branch. Particular, emphasis was placed on the relation between flow characteristics and operation performance of the rotor. A systematic description of the recent achievements and methods pertinent to the drag-type rotor is expected to motivate more fruitful work, thereby extending the application of such a promising rotor.
Activated carbon fiber-supported nano zero-valent iron on Cr(VI) removal
Authors: Chen Shengwen , Li Meng , Wu Yundun , Wang Yanyun 
Published: March 2021

Abstract
Nanoscale zero valent iron (nZVI) was adsorbed on activated carbon fiber (ACF) for efficient removal of hexavalent chromium. The composite materials were characterized by XRD, SEM, FTIR, BET and XPS. Fe2+ was adsorbed by ACF and then restored by NaBH4. This sample was named ACF-nZVI-a. While Fe2+ was restored by NaBH4 and nZVI was adsorbed by ACF. That sample was named ACF-nZVI-b. BET analysis indicated that ACF-nZVI-a had a high specific surface area of 1087 m2/g, while ACF-nZVI-b had a low specific surface area of 928 m2/g, which indicated that it was easier for nZVI to go into the ACF pores than ionic condition Fe2+. Batch experiments showed that Cr (VI) removal rate was 98.9% for ACF-nZVI-b, which was higher than that for both ACF (33.7%) and ACF-nZVI-a (50.7%). Furthermore, the removal rate of Cr (VI) by ACF-nZVI-b showed strong dependence on initial solution pH. Low pH and initial Cr (VI) concentration favored both removal efficiency and rate constants. The reaction followed a pseudo first-order model under different initial Cr (VI) concentrations. The Cr (VI) removal was attributed to both the adsorption of ACF and the reducibility of nZVI, but the main cause was the reduction of nZVI. This study demonstrated that the ACF-nZVI-b had the potential to become an effective agent for the removal of Cr (VI) from polluted water.
Design and application of heat pipe heat exchange technology for supplying the anti-freeze heating in coal mines
Authors: Tang Weiwei , Yang Lizhong , Bai Yanbin , Yang Luhan 
Published: March 2021

Abstract
For designing the heat exchanger to supply necessary anti-freeze heating in the inlet wellhead of a mine, the specific heat demand there and the state of the art of the heat pipe technologies for waste heat recovery are reviewed. According to the existing conditions in a mine located in a cold region, a heat pipe heat exchanger was designed, the feasibility of this heat pipe heat exchanger was theoretically investigated, and the influence of the heat exchange efficiency on the effect of the heat exchanger was analyzed. Then the necessary guarantee measures and the implementation scheme for sufficient heat supply under the extremely cold weather conditions were pointed out. Finally, the feasibility of this heat pipe heat exchange technology is verified by the actual preliminary operation performance and the key technical problems of its application are clarified.
Optimization of horizontal well fracturing mode in Gaotaizi tight reservoirs of L26 well block in Daqing Oilfield
Authors: Liu Lifeng , Bai Xijun , Li Fengfeng , Wang Xin 
Published: March 2021

Abstract
The tight reservoir of the Gaotaizi oil layer in the L26 well area of Daqing Oilfield is a typical sand sheet deposit, with complex geological conditions. It is difficult to evaluate the production of horizontal wells in tight reservoirs with different well layout and fracturing operation scales, and the reasonable fracturing mode is unclear. Based on the study of reservoir characteristics and fracturing parameters in the area, multi-scale and multi-media well group models of sand sheet facies deposition in the Gaotaizi reservoir were established, and the reasonable well spacing under the mode of parallel and staggered fracture distribution was studied by numerical simulation. The results show that the production of horizontal wells with staggered fractures is slightly higher than that with parallel fractures. The well spacing of wells with parallel fractures is 600m, and the optimal well spacing under staggered fracturing is 500m. The results provide a basis for the optimal design of tight oil horizontal wells in the Gaotaizi reservoir of Daqing.
Molecular dynamics simulation of promoting nucleation of CO2 hydrate by ethylene oxide and tetrahydrofuran
Authors: Yang Xuefeng , Du Shuai , Hao Yongchao , Xu Jiafang 
Published: March 2021

Abstract
Storing carbon dioxide in the form of hydrates is a meaningful way to reduce carbon emissions, which is of great significance to the replacement of extracted hydrates, the storage and transportation of gases, and the safety of oil and gas pipelines. In this paper, the molecular dynamics simulation was used to study the effects of ethylene oxide (EO) and tetrahydrofuran (THF) on the nucleation of carbon dioxide hydrate. The result shows that both EO and THF can promote the nucleation of carbon dioxide hydrate and shorten the nucleation time. For the same number of molecules, THF has a better promotion of nucleation of CO2 hydrates than EO. It was also found that the addition of THF and EO promoted the formation of sII type cages in the system. The study provides a microcosmic perspective for the enhancement of hydrate nucleation by additives.
Investigation on the new design method of heat source for reducing the energy consumption in the shaft antifreeze system
Authors: Bai Yanbin , Yang Lizhong , Zheng Song , Tang Weiwei 
Published: March 2021

Abstract
In order to suppress the heat consumption for shaft antifreeze in coal mines, this study first analyzed the meteorological data required for shaft antifreeze in typical five cities (Harbin, Yulin, Hefei, Guiyang, and Nanning) located in different climate zones in China. The analysis results explain why some shaft heating measures must be taken in severely cold regions. So, in this study, Harbin is taken as the case city for research to show that the traditional heat load design methods have the problem of mismatching between the actual heat load and the designed heat load. Next, the annual temperature change analysis in Harbin reveals that the occurrence frequency of the extremely low temperature in a year is small and its continuation time is short. According to this finding, a new heat load design method is proposed based on the dual heat source usage. In this new method, the main heat source will be designed for flat-peak heat load compensation and the standby heat source will be designed for peak heat load compensation. The main heat source should be selected based on the outdoor calculated temperature for the shaft antifreeze system. The standby heat source should be selected based on the mean value between the average of the year-over-year lowest temperature and the outdoor design temperature for the adit system and on the average of the year-over-year lowest temperature for the vertical/inclined shaft system. The standby heat source accounts for 13% of the total heat load and the main heat source accounts for 87% of the total heat load in the adit system. On the other hand, the standby heat source accounts for 23% of the total heat load and the main heat source accounts for 77% of the total heat load in the vertical/inclined shaft system.
Influence of the calcination temperatures on thermal properties of natural iron ore for heat energy storage
Authors: Ma Huibo , Du Xiaoze , Ma Shiping , Liu Yu , Zhao Pengxiang , Xing Zuoxia , Li Baorang 
Published: March 2021

Abstract
If the iron ore is used as solar heat storage material, it can greatly reduce the cost of thermal storage in concentrating solar power plants due to its lower cost. Therefore, in this paper, we made a foremost investigation on the temperature dependence of the thermal properties of the natural ore. With the help of the X-ray diffraction, scanning electron microscopy and differential scanning calorimeter, thermal properties of the samples were measured and analyzed.
Research on the method of dynamic PDC cutters distribution
Authors: Peng Qi , Zhou Yingcao , Yang Xiongwen , Liu Yu , Cheng Chris 
Published: March 2021

Abstract
PDC bit design, especially the design of the crown and cutters of PDC bit, is a relatively complex analysis process, which involves many factors such as the back-dip angle, cutting depth, cutting force, cutting power and other factors of PDC cutters. At present, the traditional design methods of PDC cutters distribution are mostly based on analysis of rock breaking efficiency of single cutter, which can only reflect the working state of the single cutter under the set parameters, and cannot fully reflect the differences of different positional cutters during the cutting process. In order to solve this problem, this article proposes a dynamic method through target formation lithology characteristics. The working parameters of all the PDC cutters are analyzed in detail basing on equal wear theory and bottom hole covering theory. The working parameters include static parameters (cutting position, back dip angle, cutting depth, effective cutting area.) and dynamic parameters (cutting force, cutting power, cutting torque and cutting energy etc.). The energy required by all the PDC cutters to break rock of per volume during drilling process is taken as the target constraint condition for iterative analysis. This design method can intuitively and effectively analyse the working parameters of cutters which located bit core, nose, shoulder and gauge area, and it provides a good reference for dynamic balance design of PDC bit.
A simulation study on the effect of the dispersion on the process of enhanced oil recovery
Authors: Wang Deqiang , Zhang Xiansong , Zhang Jian , Cheng Linsong 
Published: March 2021

Abstract
Gas injection is a potential proven enhanced oil recovery technique due to the difficulty of injecting water in the low permeability reservoir. In the process of gas flooding, there is mass transfer between fracture-matrix, which is called diffusion due to the fluid velocity difference in matrix and fractures. In the complex fracture network formed by hydraulic fracturing in the low permeability formation, this mass transfer is widely existed. However, it is often neglected in the past studies about optimization design of gas flooding. In this paper, embedded discrete fracture model (EDFM) using vectorization programming is built which is easy to obtain pressure gradient and velocity to characterize dispersion caused by velocity difference between matrix and fracture. And the EDFM is used to simulate the gas flooding for a typical well, which is in good agreement with Eclipse verified the accuracy of the model. Through a series of comparisons, the influences of different fracture network mode, matrix permeability, dispersion and gas injection rate on gas flooding are analyzed and the well performance is comprehensively evaluated considering the fracture network and the dispersion in the gas flooding.
A CFD computational model for high-pressure liquid CO2 decompression
Authors: Xiao Chenghuan , Lu Zhaijun , Yao Shujian , Yan Liguo , Wang Jiaqiang 
Published: March 2021

Abstract
A CFD decompression model with considering external flow field is established based on the non-equilibrium phase transition. The results of pressure and decompression wave speed calculated by CFD are compared with the results of “shock tube” test, showing good agreement. On this basis, the effects of external flow field on the transient behaviour of liquid CO2 decompression in the pipe is further investigated. It is found that the external flow field basically has no effect on the variation of pressure and decompression wave speed in the pipe. Moreover, a Mach disk is formed at about 7.35R (R is the radius of rupture opening, 19.05 mm) away from the rupture opening in the process of jet expansion. Although the external flow field has a significant influence on the static pressure at the rupture opening, the mass flow in the case without considering external flow field is larger than that with considering external flow field, and the overall difference between the two cases is within 6%.
Ship Hydrodynamics of Several Typical Scenes During Inland Waterway Transport
Authors: Li Zhuoyue , Du Peng , Ouahsine Abdellatif , Hu Haibao 
Published: March 2021

Abstract
Environmental effects on ship hydrodynamics during inland waterway transport are investigated using both CFD (Computational Fluid Dynamics) and towing tank experiments. Three important scenes, the confinement effect of the waterway, head-on encounter and ship-bridge pier interactions are studied. The testing conditions cover a wide range, including various channel dimensions, water depths, ship draughts and speeds. The ship resistance, wave pattern, Kelvin angle and wave elevations are investigated as functions of these parameters.
Effect of Drip Irrigation with Magnetised Water and Fertiliser on Cotton Nutrient Absorption
Authors: Nie Jing , Wang Nianyi , Wang Kang , Li Yang , Chao Xuewei , Li Jingbin 
Published: March 2021

Abstract
In order to improve the nutrient absorption effect of cotton in the process of simultaneous application of water and fertiliser, this paper studied the effect of injecting magnetised water and fertiliser on cotton nutrient absorption under the production conditions of drip irrigation. In the process of integrated water and fertiliser management of cotton, the study adopted the method of magnetisation treatment—After the water-fertiliser fusion liquid is magnetised by a magnetisation device, it is dripped on the cotton field through the drip irrigation pipe network. In this work, the water and fertiliser magnetisation device was designed, and it was combined with the drip irrigation pipe network as a test device. The nutrient absorption test of the water-fertiliser fusion liquid applied to cotton under different magnetic fields was conducted. The accumulation, absorption and distribution of cotton biomass and N, P and K elements were studied respectively. As a result of the research, we found that the magnetised water and fertiliser treatment can promote cotton nutrient absorption to varying degrees. A method of drip irrigation under a magnetised water and fertiliser film to improve the nutrient absorption effect of cotton was proposed.
Overview of Nitrogen Removal in Constructed Wetland and Its Influencing Factors
Authors: Tang Gang , Shi Yucui , You Shaohong 
Published: March 2021

Abstract
Nitrogen, as a common substance in water pollution, can easily cause eutrophication of water when it is excessive. Constructed wetland, as a water treatment method that combines the common actions of plants, microorganisms, and substrates, has positive significance for the removal of nitrogen. This article reviews the nitrogen removal mechanism of each component in constructed wetlands, and the effects of temperature, carbon-nitrogen ratio, dissolved oxygen, pH, and HRT on denitrification, and proposes existing problems and research directions in constructed wetlands.