检索结果-内蒙古大学图书馆

Integrated Train Ground Radio Communication system Based TD-LTE

Chinese Journal of Electronics 2016年第4期25卷 740-745页

作者： ZHAO Hongli CAO Yuan ZHU Li XU Wei National Engineering Research Center of Rail Transportation Operation and Control System Beijing Jiaotong University State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University National Mobile Communications Research Lab. Southeast University

In existing metro systems,the train ground radio communication system for different applications are deployed *** and constructing the communication infrastructures repeatedly wastes substantial social resources,and it brings difficulties to maintain all these *** present the communication Quality of service(Qo S) requirement for different train ground radio *** integrated TD-LTE based train ground radio communication system for the metro system(LTE-M) is designed *** order to test the LTEM system performance,an indoor testing environment is set *** channel simulator and programmable attenuators are used to simulate the real metro *** test results show that the designed LTE-M system performance satisfies metro communication requirements.

关键词： Communication based train control(CBTC) Train control LTE-M Performance test

来源：评论

学校读者我要写书评

暂无评论

Modeling and simulation of DC micro-grid based on virtual motor control

Modeling and simulation of DC micro-grid based on virtual mo...

引用

2017 IEEE Transportation Electrification Conference and Expo, Asia-Pacific, ITEC Asia-Pacific 2017

作者： Yi, Wei Yi, Dawei Hu, Xiongwei Wang, Xiangnv Shi, Fang Key Laboratory of Power System Intelligent Dispatch and Control of the Ministry of Education Shandong University 17923 Jingshi Road Jinan China National Joint Engineering Laboratory of Power Grid with Electric Vehicles 17923 Jingshi Road Jinan China State Grid Heilongjiang Power Corporation Harbin Electricity Power Supply Company 188 Shangzhi Road Harbin China

ISBN: (纸本)9781538628942

A flexible DC micro-grid model is proposed, which is suitable for grid-connected renewable energy and energy storage. The complete circuit topology and its corresponding control strategy are given, which can make sure energy reliability, and can automatically achieve a reasonable power distribution. In addition, based on the theory of Virtual Generator (VG), a complete control strategy of each interface is proposed, that is, the Virtual DC Generator (VDG) control strategy is adopted in the load and energy storage unit, and the Virtual Synchronous Generator (VSG) control strategy is adopted in the grid connection interface. VSG has the similar active and reactive power adjustment ability to the synchronous generator. The voltage amplitude and frequency of the grid- connected inverter are adjustable. It can simulate the inertia and damping characteristics of the synchronous generator, and overcome the impact of the traditional grid-connected inverter without inertia to the grid, which can effectively enhance the ability of the grid to accept renewable energy. What's more, the model of electric vehicles is considered into the micro-grid to meet the future trend of power grid. simulation and experimental results verify the validity and reliability of the proposed. © 2017 IEEE.

关键词： DC-DC converters

来源：评论

学校读者我要写书评

暂无评论

强厄尔尼诺期间大气环流对华北地区灰霾的影响

强厄尔尼诺期间大气环流对华北地区灰霾的影响

引用

第24届中国大气环境科学与技术大会暨中国环境科学学会大气环境分会2018年学术年会

作者： Ge Zhang Yang Gao Wenju Cai L.Ruby Leung Shuxiao Wang Bin Zhao Minghuai Wang Huayao Shan Xiaohong Yao Huiwang Gao Key Laboratory of Marine Environmental Science and Ecology Ministry of EducationOcean University of Key Laboratory of Marine Environmental Science and Ecology Ministry of EducationOcean University of Physical Oceanography Laboratory/CIMST Ocean University of China and Qingdao National Laboratory for Atmospheric Sciences and Global Change Division Pacific Northwest National LaboratoryRichlandWashi State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsi Joint Institute for Regional Earth System Science and Engineering and Department of Atmospheric and School of Atmospheric Sciences Nanjing UniversityNanjing210023China

利用全国PM2.5监测网数据分析发现，华北地区在 2015 年 12 月和 2016 年 1 月出现 PM2.5 浓度异常高、低的跷跷板现象，此现象可能与强厄尔尼诺和北极涛动(AO)共同导致的局地气象变化有关.

关键词：灰霾强厄尔尼诺北极涛动东亚冬季风 WRF-CMAQ

来源：评论

学校读者我要写书评

暂无评论

A prediction model for traffic emission based on interval-valued intuitionistic fuzzy sets and case-based reasoning theory

A prediction model for traffic emission based on interval-va...

引用

作者： Wei, Ming Dai, Qiuxia State Key Joint Laboratory of Environment Simulation and Pollution Control Beijing China Jiangsu Key Laboratory of Urban ITS Southeast University Nanjing China

Prediction of traffic emission is very important to management actions for traffic emission reduction. To overcome the shortcomings of ordinary prediction methods in previous studies, a novel model for the prediction of traffic emission is proposed for the combination of interval-valued intuitionistic fuzzy sets and case-based reasoning theory. Based on analysis of the factors that affect the traffic emission, a characteristic factor matrix of the source cases was constructed. Then, an interval-valued intuitionistic fuzzy set was introduced in order to describe the uncertainty of the case, and the source case that was the most similar to the target case, was picked out by calculating the similarities between the source cases and the target case, therefore leading to the improvement in prediction accuracy. Finally, a case study was conducted to evaluate the effectiveness of the constructed prediction model. © 2016 - IOS Press and the authors. All rights reserved.

关键词： Forecasting

来源：评论

学校读者我要写书评

暂无评论

Power optimization control strategy of peak load shifting of energy storage system in business park

Power optimization control strategy of peak load shifting of...

引用

2017 Chinese Automation Congress, CAC 2017

作者： Xiyun, Yang Dehua, Dong Xue, Ma Na, Geng Jianhua, Zhang School of Control and Computer Engineering North China Electric Power University Beijing China EPRI of Jilin Electric Power Co. Ltd. Jilin China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing China

ISBN: (纸本)9781538635247

With economic and industrial restructuring, the number and size of commercial parks are increasing. The most basic function of energy storage system in commercial parks is to carry out the load side, Which also brings economic benefits and ensures the reliability of power grid. Therefore, it is of practical significance to study the control strategy of energy storage system in business parks. In this paper, a variable parameter power difference control strategy for energy storage system is proposed. Based on the typical daily load of the park, it divides the load interval and the SOC of the energy storage system. Different subspaces are provided with different strategies. Finally, a simulation analysis, taking a Shanghai business park as an actual data sample shows that the proposed method for the energy storage system is effective. © 2017 IEEE.

关键词： Energy storage

来源：评论

学校读者我要写书评

暂无评论

Enrichment of denitrifying methanotrophic bacteria from Taihu sediments by a membrane biofilm bioreactor at ambient temperature

引用

Environmental Science and Pollution Research 2016年第6期23卷 5627-5634页

作者： Wang, Shenghui Wu, Qing Lei, Ting Liang, Peng Huang, Xia College of Life Science Liaocheng University Liaocheng252059 China State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China

Denitrification coupled to anaerobic methane oxidation is a recently discovered process performed by bacteria affiliated to the NC10 phylum. These microorganisms could play important roles in the energy-efficient way of anaerobic wastewater treatment where residual dissolved methane might be removed at the expense of nitrate or nitrite. The difficulty to enrich these microorganisms due to a slow growth rate, especially at low temperatures, limited its application in engineering field. In this study, an NC10 bacteria community was enriched from Taihu sediments by a membrane biofilm bioreactor at ambient temperature of 10–25 °C. After 13 months enrichment, the maximum denitrification rate of the enriched culture reached 0.54 mM day−1 for nitrate and 1.06 mM day−1 for nitrite. Anaerobic methane oxidation coupled denitrification was estimated from the 13C-labeled CO2 (13CO2) production during batch incubations with 13CH4. Furthermore, analysis of 16S rRNA genes clone library confirmed the presence of NC10 phylum bacteria and fluorescence in situ hybridization showed that NC10 bacteria dominated the reactor. All of the results indicated the NC10 bacteria community was competitive in terms of treating nitrate-contaminated water or wastewater under natural conditions. © 2015, Springer-Verlag Berlin Heidelberg.

关键词： Biofilms

来源：评论

学校读者我要写书评

暂无评论

Evaluation of Prediction Choice in Economic Dispatch with Uncertainty

Evaluation of Prediction Choice in Economic Dispatch with Un...

引用

2017 International Electrical and Energy Conference (CIEEC 2017)

作者： Fan Zhang Ying Qiao Zongxiang Lu Ningbo Wang Jin Li Kun Ding State Key Lab of Control and Simulation of Power Systems and Generation Equipments Dept.of Electrical EngineeringTsinghua University Key Laboratory of Wind Power Integration Operation and Control of Gansu Province Gansu Electric Power Corporation Wind Power Technology Center

The unavoidable wind power forecast error results in the pervasive uncertainty in power system economic *** order to solve optimization problem such as economic dispatch with random variables,the commonest and simplest method is using a deterministic value to replace this random *** kinds of predictions are used such as maximumlikelihood approximation,expectation and *** study analyses the effect of these prediction choices on uncertainty of power system via comparing their statistical *** is shown that when the wind power output is very volatile,the quality of these prediction choices is not ***,a simplified three-unit thermal system and a tenunit system are studied for illustrating the consequence of statistical inconsistency.

关键词： Economic Dispatch expectation maximumlikelihood prediction uncertainty wind power forecast error

来源：评论

学校读者我要写书评

暂无评论

Research on Peak Load Regulation Capacity Planning for Long-term Market

Research on Peak Load Regulation Capacity Planning for Long-...

引用

2017 International Electrical and Energy Conference (CIEEC 2017)

作者： Jiheng Jiang Ying Qiao Zongxiang Lu Ningbo Wang Jin Li Kun Ding State Key Lab of Control and Simulation of Power Systems and Generation Equipments Dept.of Electrical Engineering Tsinghua University Key Laboratory of Wind Power Integration Operation and Control of Gansu Province Gansu Electric Power Corporation Wind Power Technology Center

Insufficient power capacity for peak load regulation has caused loss of wind power accommodation in China.A regulation capacity market is under consideration to encourage more peak regulation service,thus how much the market would be is important for each participant.A new peak-load regulation capacity planning method is proposed for long-term market based on the wind power curtailment evaluation model using probabilistic production *** method is suitable for the situation in the planning stage without the knowledge of detailed sequences of load and renewable power,and includes modeling of two peak load regulation measures,increasing the adjustable capacity and to shift some long-lasting units to on/off cycling units.A typical area in China is studied in the paper to evaluate the actual effects of different measures.

关键词： adjustable capacity capacity planning peak load regulation probabilistic production simulation

来源：评论

学校读者我要写书评

暂无评论

Research on a cloud image forecasting approach for solar power forecasting

引用

Energy Procedia 2017年 142卷 362-368页

作者： Zhao Zhen Zheng Wang Fei Wang Zengqiang Mi Kangping Li State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources (North China Electric Power University) Baoding 071003 China State Key Laboratory of Operation and Control of Renewable Energy & Storage System (China Electric Power Research Institute) Haidian District Beijing 100192 China Department of Electrical and Computer Engineering University of Illinois at Urbana-Champaign Urbana IL 61801 USA

Accurate cloud image forecasting is very necessary for sky image based solar power forecasting. To provide a means that can track the cloud deformation process and then forecast the cloud shape and position in a future sky image, a cloud image forecasting approach is proposed in this paper. Firstly, the cloud pixels in sky images are identified using Otsu’s method. Secondly, a mathematical description method of cloud location, shape, and deformation is suggested, so that the key information of cloud and its deformation process can be extracted from original images and then digitized. Thirdly, genetic algorithm (GA) is applied to optimize the cloud deformation process according to digitized historical cloud information. In the end, the cloud shape and position in a future image is forecasted using linear extrapolation. The feasibility and effectiveness of the proposed method are validated by simulation.

关键词： sky image solar power forecasting optimization cloud image forecasting

来源：评论

学校读者我要写书评

暂无评论

A buried Neolithic paddy soil reveals loss of microbial functional diversity after modern rice cultivation

引用

Science Bulletin 2016年第13期61卷 1052-1060页

作者： Yong-Guan Zhu Jian-Qiang Su Zhihong Cao Kai Xue John Quensen Guang-Xia Guo Yun-Feng Yang Jizhong Zhou Hai-Yan Chu James M.Tiedje Key Laboratory of Urban Environment and Health Institute of Urban Environment Chinese Academy of Sciences State Key Laboratory of Urban and Regional Ecology Research Center for Eco-environmental Sciences Chinese Academy of Sciences Institute of Soil Science Chinese Academy of Sciences Institute for Environmental Genomics University of Oklahoma Center for Microbial Ecology Department of Plant Soil and Microbial Sciences Michigan State University State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University

It has been documented that human activities are causing the rapid loss of taxonomic, phylogenetic, genetic and functional diversity in soils. However, it remains unclear how modern intensive rice cultivation impacts the soil microbiome and its functionality. Here we examined the microbial composition and function differences between a buried Neolithic paddy soil and an adjacent, currently-cultivated paddy soil using high throughput metagenomics technologies. Our results showed that the currently cultivated soil contained about 10-fold more microbial biomass than the buried one. Analyses based on both 16S rRNA genes and functional gene array showed that the currently cultivated soil had significantly higher phylogenetic diversity, but less functional diversity than the buried Neolithic one. The community structures were significantly different between modern and ancient soils, with functional structure shifting towards accelerated organic carbon （C） degradation and nitrogen （N） transfor- mation in the modem soils. This study implies that, modern intensive rice cultivation has substantially altered soil microbial functional structure, leading to functional homogenization and the promotion of soil ecological functions related to the acceleration of nutrient cycling which is necessary for high crop yields.

关键词： Neolithic paddy soil Long-term ricecultivation 16S rRNA gene pyrosequencing -Bacterial community - Functional gene diversityGeoChip

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：