检索结果-南通市图书馆

Wind-integration benefits of controlled plug-in electric vehicle charging

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Modern Power Systems and Clean Energy 2017年第5期5卷 746-756页

作者： Sachin CHANDRASHEKAR yixian liu Ramteen SIOSHANSI Department of Integrated Systems Engineering The Ohio State UniversityColumbusOHUSA

Flexibility in plug-in electric vehicle(PEV) charging can reduce the ancillary cost effects of wind variability and uncertainty on electric power systems. In this paper, we study these benefits of PEV charging, demonstrating that controlled PEV charging can reduce costs associated with wind uncertainty and variability. Interestingly, we show that the system does not require complete control of PEV-charging loads to mitigate the negative cost impacts of wind variability and uncertainty. Rather, PEV owners giving the system a two-hour window of flexibility in which to recharge their vehicles provides much of the benefits that giving full charging control does.

关键词： Plug-in electric vehicle Controlled charging Wind integration Demand response Unit commitment and dispatch

A vector autoregression weather model for electricity supply and demand modeling

在线全文

学校读者我要写书评

暂无评论

Journal of Modern Power Systems and Clean Energy 2018年第4期6卷 763-776页

作者： yixian liu Matthew C.ROBERTS Ramteen SIOSHANSI Department of Integrated Systems Engineering The Ohio State University Department of Agricultural Environmental and Development Economics The Ohio State University

Weather forecasting is crucial to both the demand and supply sides of electricity systems. Temperature has a great effect on the demand side. Moreover, solar and wind are very promising renewable energy sources and are, thus, important on the supply side. In this paper, a large vector autoregression(VAR) model is built to forecast three important weather variables for 61 cities around the United States. The three variables at all locations are modeled as response variables. Lag terms are used to capture the relationship between observations in adjacent periods and daily and annual seasonality are modeled to consider the correlation between the same periods in adjacent days and years. We estimate the VAR model with16 years of hourly historical data and use two additional years of data for out-of-sample validation. Forecasts of up to six-hours-ahead are generated with good forecasting performance based on mean absolute error, root mean square error, relative root mean square error, and skill scores. Our VAR model gives forecasts with skill scoresthat are more than double the skill scores of other forecasting models in the literature. Our model also provides forecasts that outperform persistence forecasts by between6% and 80% in terms of mean absolute error. Our results show that the proposed time series approach is appropriate for very short-term forecasting of hourly solar radiation,temperature, and wind speed.

关键词： Forecasting Solar irradiance Wind speed Temperature Vector autoregression Skill scores

Quantifying Contribution of DER-Integrated EV Parking Lots to Reliability of Power Distribution Systems

在线全文

学校读者我要写书评

暂无评论

Energy Engineering 2021年第6期118卷 1713-1728页

作者： Bo Zeng yixian liu Yangfan Luo State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing102206China

In the future smart cities,parking lots(PLs)can accommodate hundreds of electric vehicles(EVs)at the same *** trend creates an opportunity for PLs to serve as a potential flexibility resource,considering growing penetration of EVs and integration of distributed energy resources DER(such as photovoltaic and energy storages).Given this background,this paper proposes a comprehensive evaluation framework to investigate the potential role of DER-integrated PLs(DPL)with the capability of vehicle-to-grid(V2G)in improving the reliability of the distribution *** this aim,first,an overview for the distribution system with DPLs is ***,a generic model for the available generation capacity(AGC)of DPLs with consideration of EV scheduling strategy is *** the above basis,an iterative-based algorithm leveraging sequential Monte Carlo simulation is presented to quantify the contribution of DPLs to the reliability of the *** order to verify the effectiveness of the proposed method,a series of numerical studies are carried *** simulation results show that the integration of DPLs with the V2G capability could help to improve the reliability performance of distribution grid to a great extent and reduce the adverse impact incurred by EV accommodation,if utilized properly.

关键词： Electric vehicle PV-integrated parking lots capacity support vehicle-to-grid distributed energy resource

Fe-doped SnO_(2) nanosheet for ambient electrocatalytic nitrogen reduction reaction

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2022年第7期15卷 6026-6035页

作者： Yaxi Li yixian liu Xiang liu Yunliang liu Yuanyuan Cheng Peng Zhang Peiji Deng Jiujun Deng Zhenhui Kang Haitao Li Institute for Energy Research School of Chemistry and Chemical EngineeringJiangsu UniversityZhenjiang 212013China Institute of Medicine&Chemical Engineering Zhenjiang CollegeZhenjiang 212000China Key Laboratory for Water Quality and Conservation of the Pearl River Delta Ministry of EducationInstitute of Environmental Research at Greater BayGuangzhou UniversityGuangzhou 510006China School of Physics The University of SydneySydneyNew South Wales 2006Australia Institute of Functional Nano and Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-based Functional Materials and DevicesSoochow UniversitySuzhou 215123China

Ammonia plays a vital role in the development of modern agriculture and *** to the conventional Haber–Bosch ammonia synthesis in industry,electrocatalytic nitrogen reduction reaction(NRR)is considered as a promising and environmental friendly strategy to synthesize ***,inspired by biological nitrogenase,we designed iron doped tin oxide(Fe-doped SnO_(2))for nitrogen *** this work,iron can optimize the interface electron transfer and improve the poor conductivity of the pure SnO_(2),meanwhile,the synergistic effect between iron and Sn ions improves the catalyst *** the electrocatalytic NRR test,Fe-doped SnO_(2) exhibits a NH_(3) yield of 28.45μg·h^(−1)·mgcat^(−1),which is 2.1 times that of pure SnO_(2),and Faradaic efficiency of 6.54%at−0.8 V *** in 0.1 M Na_(2)SO_(4).It also shows good stability during a 12-h long-term stability *** functional theory calculations show that doped Fe atoms in SnO_(2) enhance catalysis performance of some Sn sites by strengthening N–Sn interaction and lowering the energy barrier of the rate-limiting step of *** transient photovoltage test reveals that electrons in the low-frequency region are the key to determining the electron transfer ability of Fe-doped SnO_(2).

关键词： electrocatalyst nitrogen reduction reaction Fe-doped SnO_(2)

A core-satellite structured type Ⅱ heterojunction photocatalyst with enhanced CO_(2) reduction under visible light

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2022年第10期15卷 8880-8889页

作者： Yuanyuan Cheng yixian liu Yunliang liu Yaxi Li Ruqiang Wu Yongchao Du Najmeh Askari Naiyun liu Fen Qiao Chenghua Sun Zhenhui Kang Haitao Li Institute for Energy Research School of Chemistry and Chemical EngineeringJiangsu UniversityZhenjiang 212013China Faculty of Science Engineering&TechnologySwinburne University of TechnologyVictoria 3122Australia Institute of Functional Nano and Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-based Functional Materials and DevicesSoochow UniversitySuzhou 215123China

Photocatalytic reduction of carbon dioxide into valuable chemicals is a sustainable and promising technology that alleviates the greenhouse effect and energy *** this study,the Mn_(3)O_(4)/FeNbO_(4) type Ⅱ heterojunction photocatalyst with a core-satellite structure was synthesized by the facile soft chemical *** formation of a nano-heterojunction is supposed to effectively improve light capture,charge transfer,and interfacial charge separation in the photochemical ***,the heterojunction has a good ability to capture and activate CO_(2).Our results show that the prepared Mn_(3)O_(4)/FeNbO_(4) photocatalyst exhibit obvious enhanced catalytic properties in the photocatalytic CO_(2) reduction reaction,where the CH_(4) yielding rate is 1.96 and 9.81 times those of FeNbO_(4) and Mn_(3)O_(4),*** transient photovoltage test(TPV)shows that the low frequency electrons are crucial to the effective transfer of photogenerated electrons and holes in the Mn_(3)O_(4)/FeNbO_(4) nano *** of in situ Fourier transform infrared spectroscopy(FTIR)verifies the effective CO_(2) adsorption on the Mn_(3)O_(4)/FeNbO_(4) surface and the high selectivity of CH_(4) *** properties of the Mn_(3)O_(4)/FeNbO_(4) photocatalyst infer its broad prospects in the fields of carbon fixation and energy conservation.

关键词： typeⅡheterojunction Mn_(3)O_(4)/FeNbO_(4) photocatalysis CO_(2)reduction

Carbon armour with embedded carbon dots for building better supercapacitor electrodes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2023年第5期16卷 6815-6824页

作者： Yuanyuan Cheng yixian liu Chen Chu Yunliang liu Yaxi Li Ruqiang Wu Jianchun Wu Chunqiang Zhuang Zhenhui Kang Haitao Li Institute for Energy Research School of Chemistry and Chemical EngineeringJiangsu UniversityZhenjiang 212013China School of Materials Science and Engineering Jiangsu UniversityZhenjiang 212013China Institute of Nuclear Science and Technology Sichuan UniversityChengdu 610064China Faculty of Materials and Manufacturing Beijing University of TechnologyBeijing 100124China Institute of Functional Nano and Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-based Functional Materials and DevicesSoochow UniversitySuzhou 215123China

The microstructure design of electrode material is a crucial point to optimize the supercapacitor’s electrochemical *** this work,a Bi-based nanocomposite with a three-layer structure(Bi–Bi_(2)O_(3)@carbon armour(CA)/carbon dots(CDs))is synthesized and *** material inherits high capacitance and high activity from bismuth-based materials,the coated CA protects the structure from complete oxidization and improves surface ***,CDs in CA can enhance the ion conduction efficiency between the catalyst,carbon membrane,*** a consequence,the specific capacitance of the electrode reaches 973 F·g^(−1)under 1 A·g^(−1),the energy density achieves 32.5 Wh·kg^(−1)with a power density of 266.9 W·kg^(−1),with impressive electrochemical stability that Coulomb efficiency of the electrode remains about 100%after 5000 ***,in-situ Fourier transformation infrared(FT-IR)analyzes the structure evolvement of the material during synthesis and finds that the annealing process of the material removes a great number of oxygen-containing groups of CA and CDs,generating oxygen vacancies,defects,thus active sites,which enhance the capacitance of the material.

关键词： supercapacitor carbon armour Bi–Bi_(2)O_(3)interface carbon dots

BiVO_(4)/TiO_(2) heterojunction with rich oxygen vacancies for enhanced electrocatalytic nitrogen reduction reaction

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of physics 2021年第5期16卷 173-182页

作者： Yunliang liu Peiji Deng Ruqiang Wu Ramadan A.Geioushy Yaxi Li yixian liu Fengling Zhou Haitao Li Chenghua Sun Institute for Energy Research School of Chemistry and Chemical EngineeringJiangsu UniversityZhenjiang212013China Nanomaterials and Nanotechnology Department Advanced Materials DivisionCentral Metallurgical R&D Institute(CMRDI)P.O.Box87 Helwan11421CairoEgypt College of Chemical Engineering and Energy Technology Dongguan University of TechnologyDongguan523808China Guangxi Key Laboratory of Electrochemical Energy Materials Guangxi UniversityNanning530004China Faculty of Science Engineering&TechnologySwinburne University of TechnologyVictoria3122Australia Faculty of Engineering The University of SydneySydneyAustralia

The large-scale production of ammonia mainly depends on the Haber-Bosch process,which will lead to the problems of high energy consumption and carbon dioxide *** nitrogen fixation is considered to be an environmental friendly and sustainable process,but its efficiency largely depends on the activity and stability of the ***,it is imperative to develop high-efficient electrocatalysts in the field of nitrogen reduction reaction(NRR).In this paper,we developed a BiVO_(4)/TiO_(2) nanotube(BiVO_(4)/TNT)heterojunction composite with rich oxygen vacancies as an electrocatalytic NRR *** heterojunction interface and oxygen vacancy of BiVO_(4)/TNT can be the active site of N2 dynamic activation and proton *** synergistic effect of TiO_(2) and BiVO_(4) shortens the proton transport path and reduces the over potential of chemical ***_(4)/TNT has high ammonia yield of 8.54µg·h^(−1)·cm^(−2) and high Faraday efficiency of 7.70%in−0.8 V *** in 0.1 M Na_(2)SO_(4) solution.

关键词： TiO_(2)nanotubes BiVO_(4) interface oxygen vacancy NRR

Mechanochemical route to fabricate an efficient nitrate reduction electrocatalyst

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第6期17卷 4889-4897页

作者： Yunliang liu Zhiyu Zheng Sobia Jabeen Naiyun liu yixian liu Yuanyuan Cheng Yaxi Li Jingwen Yu Xin Wu Nina Yan Lei Xu Haitao Li Institute for Energy Research School of Energy and Power EngineeringJiangsu UniversityZhenjiang 212013China Jiangsu Engineering Technology Research Center of Biomass Composites and Addictive Manufacturing Institute of Agricultural Facilities and EquipmentJiangsu Academy of Agricultural SciencesNanjing 210014China Key Laboratory for Protected Agricultural Engineering in the Middle and Lower Reaches of Yangtze River Ministry of Agriculture and Rural AffairsNanjing 210014China

The electrochemical nitrate reduction reaction(NO_(3)RR)to ammonia under ambient conditions is a promising approach for addressing elevated nitrate levels in water bodies,but the progress of this reaction is impeded by the complex series of chemical reactions involving electron and proton transfer and competing hydrogen evolution ***,it becomes imperative to develop an electro-catalyst that exhibits exceptional efficiency and remarkable selectivity for ammonia synthesis while maintaining long-term *** the magnetic biochar(Fe-C)has been synthesized by a two-step mechanochemical route after a pyrolysis treatment(450,700,and 1000℃),which not only significantly decreases the particle size,but also exposes more oxygen-rich functional groups on the surface,promoting the adsorption of nitrate and water and accelerating electron transfer to convert it into *** showed that the catalyst(Fe-C-700)has an impressive NH_(3)production rate of 3.5 mol·h^(−1)·gcat^(−1),high Faradaic efficiency of 88%,and current density of 0.37 A·cm^(−2)at 0.8 V *** hydrogen electrode(RHE).In-situ Fourier transform infrared spectroscopy(FTIR)is used to investigate the reaction intermediate and to monitor the *** oxygen functionalities on the catalyst surface activate nitrate ions to form various intermediates(NO_(2),NO,NH_(2)OH,and NH_(2))and reduce the rate determining step energy barrier(*NO_(3)→*NO_(2)).This study presents a novel approach for the use of magnetic biochar as an electro-catalyst in NO_(3)RR and opens the road for solving environmental and energy challenges.

关键词： mechanochemical route magnetic biochar electron transfer nitrate ammonia

Construction and Innovation of Comprehensive Evaluation Means of PBL+OBE-based Software Engineering Practical Courses

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

计算机教育 2023年第12期 106-113页

作者： yixian liu Jun Guo Dongming Chen Software College Software Engineering National Experimental Teaching Demonstration CenterNortheastern UniversityShenyang110169China

Software engineering is an engineering discipline that guides software developers to carry out software development,software maintenance,and software *** traditional evaluation methods of software engineering courses do not highlight the training goal of outcomebased education(OBE).This paper systematically studies the evaluation methods for practical courses in software engineering from three aspects:course evaluation guidelines,course evaluation methods and course evaluation effects;establishes a comprehensive,scientific,and objective system of course evaluation;effectively measures students’learning effect;promotes teachers to continuously improve the teaching process;and thus improves the teaching quality of software engineering *** the general approach,this paper also takes software project construction practice as an example to demonstrate the effect of the proposed approach.

关键词： Comprehensive evaluation PBL OBE Software engineering Practical coursess