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Oxygen tolerance capacity of upflow anaerobic solid-state(UASS) with anaerobic filter(AF) system

Journal of Environmental Sciences 2016年第7期28卷 200-206页

作者： Yao Meng Carsten Jost Jan Mumme Kaijun Wang Bernd Linke State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Department Bioengineering Leibniz Institute for Agricultural Engineering UK Biochar Centre School of Geo Sciences University of Edinburgh

In order to investigate the oxygen tolerance capacity of upflow anaerobic solid-state（UASS）with anaerobic filter（AF） system, the effect of microaeration on thermophilic anaerobic digestion of maize straw was investigated under batch conditions and in the UASS with AF system. Aeration intensities of 0–431 m L O2/gvswere conducted as pretreatment under batch conditions. Aeration pretreatment obviously enhanced anaerobic digestion and an aeration intensity of 431 m L O2/gvsincreased the methane yield by 82.2%. Aeration intensities of 0–355 m L O2/gvswere conducted in the process liquor circulation of the UASS with AF system. Dissolved oxygen（DO） of UASS and AF reactors kept around 1.39 ±0.27 and 0.99 ± 0.38 mg/L, respectively. p H was relatively stable around 7.11 ± 0.04. Volatile fatty acids and soluble chemical oxygen demand concentration in UASS reactor were higher than those in AF reactor. Methane yield of the whole system was almost stable at 85 ± 7 m L/gvs as aeration intensity increased step by step. The UASS with AF system showed good oxygen tolerance capacity.

关键词： Anaerobic digestion Oxygen tolerance capacity UASS Maize straw Microaeration Solid-state

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Energy Optimization Dispatching of Microgrid in The Stand-alone Mode

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Journal of Physics: Conference Series 2019年第1期1304卷

作者： Li Sun Shujian Zhao Chenglian Ma Jing Jiang Yuanzhu Meng Tianliang Yao Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education (Northeast Electric Power University) Jilin Jilin 132012 China Power Research Institute of State Grid Jilin Electric Power Co. Ltd. Changchun Jilin 130021 China Jilin Power Supply Company State Grid Jilin Electric Power Co. Ltd. Jilin Jilin 132001 China Gansu Electric Power Design Institute Limited Company of China Energy Construction Group Lanzhou 730050 China

A microgrid system in the stand-alone mode with photovoltaic, wind turbine, microturbine, fuel cell and energy storage unit is studied. Mathematical models of different distributed power supply and energy storage devices are established. The load demand of the system, the price of purchasing and selling electricity when interacting with the power grid and other constraints are considered. An economic model for optimizing stand-alone operation cost is established. According to the characteristics of the model, an improved genetic algorithm is selected to optimize the nonlinear system. The algorithm has better stability in solving the optimization problem of large state space dimension. The case study show that the proposed economic model is reasonable and the algorithm is effective.

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Angular Speed control of Brushed DC Motor Using Nonlinear Method: Design and Experiment 35

Angular Speed Control of Brushed DC Motor Using Nonlinear Me...

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第35届中国控制会议

作者： ZHANG Sen GU Wanli HU Yunfeng DU Juan CHEN Hong Department of Control Science and Engineering Jilin University State Key Laboratory of Automotive Simulation and Control Jilin University Computing Center of Jilin Province

ISBN: (纸本)9781509009107

The major concentration of this study is on developing a novel control system with response and tracking accuracy features capable of precise angular speed regulation of brushed DC motor. Towards this objective, speed loop controller of brushed DC motor based on Triple-step nonlinear method has been designed. The Triple-step nonlinear method consists of the steady-state control, the reference variation-based feed-forward control, the error feedback control. The designed nonlinear controller has the advantage of concision and specific signification. The controller can greatly enhance the transient response performance of brushed DC motor. When a brushed DC motor running at low angular speed, the system appears the speed fluctuation and dead-zone characteristic. Therefore, the friction model of motor is considered in the design of controller. Current dynamic is neglected due to the fast electric response, the commonly used feedforward controller and PI feedback controller is designed. The effectiveness of the control method compared with conventional PID controllers is verified through experiments.

关键词： Brushed DC Motor Triple-step Method Friction model Angular Speed control

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Direct Yaw-moment control of Vehicle Stability Based on Robust Sliding Mode Observer 28

Direct Yaw-moment Control of Vehicle Stability Based on Robu...

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第28届中国控制与决策会议

作者： Zhang Niaona Cao congcong Xu Caimao Yan Wenling Electronic and Electrical Engineering Institute Changchun University of Technology State Key Laboratory of Automotive Simulation and Control Jilin University

ISBN: (纸本)9781467397155

In order to improve the driving stability of vehicles under high speed and poor road and other extreme conditions and overcome excessive steering and under steering problems appeared during the vehicle running process,a new robust control strategy based on direct yaw moment for the vehicle stability is *** of all,according to the steering wheel angle and longitudinal speed,the robust sliding mode observer is designed through the two degree-of-freedom vehicle model to get ideal side slip angle and yaw *** the deviation between the yaw rate and the ideal one is selected as the input *** step terminal sliding mode control strategy of the vehicle stability based on direct yaw moment is *** not only overcomes the chattering problem existed in the sliding mode,but also solves the handling stability problem caused by the failure of designed control strategy due to inaccurate modeling,parameter perturbation and the changes of external *** addition,finite time convergence of the direct yaw moment system for the vehicle stability is achieved,and the rapidity and robustness of direct yaw moment system is *** it also realizes the finite time convergence of the vehicle stability directly *** effectiveness of the proposed method is validated through simulation in this paper.

关键词： yaw moment high-order sliding mode robust observer

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Economic Optimal Dispatch of Grid-connected Microgrid Based on Improved Genetic Algorithm

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Journal of Physics: Conference Series 2019年第1期1304卷

作者： Li Sun Shujian Zhao Chenglian Ma Naixin Chen Tianliang Yao Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education (Northeast Electric Power University) Jilin Jilin 132012 China Power Research Institute of State Grid Jilin Electric Power Co. Ltd. Changchun Jilin 130021 China Changchun Power Supply Company State Grid Jilin Electric Power Co. Ltd. Changchun Jilin 130000 China Gansu Electric Power Design Institute Limited Company of China Energy Construction Group Lanzhou 730050 China

Nowadays, the demand for energy is expanding, the fossil resources are on the verge of exhaustion, and the ecological environment is getting worse and worse. In this form, this paper studies the economic optimal dispatch of microgrid under the background of energy saving and emission reduction. Firstly, the mathematical model of microgrid composed of distributed power, energy storage devices and loads is established. Secondly, under the background of energy saving and emission reduction, the objective function of multi-objective optimal operation of microgrid is established considering both economic and environmental aspects. Finally, the improved Genetic Algorithm is used to solve the objective function. The results of optimization can reduce microgrid system generation cost.

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Biologic risk and source diagnose of 16 PAHs from Haihe River Basin, China

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Frontiers of Environmental Science & Engineering 2016年第1期10卷 46-52页

作者： Qiuying CHEN Jingling LIU Feng LIU Binbin WANG Zhiguo CAO State Key Joint Laboratory of Environmental Simulation and Pollution Control & School of Environment Beijing Normal University Beijing 100875 China College of Chemistry and Life Science Shenyang Normal University Shenyang 110034 China

Surface sediments of rivers can exhibit spatial and temporal variations in contaminant concentrations that may significantly affect risk evaluations. As to pollution control and remediation of watershed, large-scale and further background data on PAHs in China were required urgently. Spatial distribution and compositional character- istics of 16 polycyclic aromatic hydrocarbons （PAHs） in surface sediments from Haihe River Basin were investi- gated. A method based on effects range （ER） was used to assess ecosystem risk of ZPAHs （the total of 16 PAH） sensitively and accurately. The results indicated that ∑PAHs content levels ranged from 257 to 16901 μg·kg-1 dry weight. The lower tings predominated in the samples, and 2-, 3-, 4-, 5- and 6-ring PAHs accounted for 12%, 21%, 30%, 30%, and 7% respectively in total PAHs. The ratio of F1 / （F1 ＋ Py） uniformly distributed in the interval 0.20- 0.80, indicating that it may be affected by petroleum origin, oil combustion, biomass and coal combustion jointly. ∑PAHs in Cetian （S6）, Dongwushi （S19）, Handan （S20）, Aixinzhuang （S21） and Tianjin （S37） exceeded effects range low （ERL）, in which biologic effects were in a medium level with an adverse effect on biologic organisms. Thus, it is necessary to strengthen the PAHs monitoring and research of the Haihe River Basin.

关键词： polycyclic aromatic hydrocarbons （PAHs）,biological effects sediment Haihe River

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Speed control of the Permanent-Magnet DC Motor Subjected to Uncertainty and Disturbance 35

Speed Control of the Permanent-Magnet DC Motor Subjected to ...

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第35届中国控制会议

作者： CHU Hongqing TAO Weinan GAO Bingzhao LIU Qifang CHEN Hong Department of Control Science and Engineering Jilin University(Nanling Campus) State Key Laboratory of Automotive Simulation and Control Jilin University(Nanling Campus)

ISBN: (纸本)9781509009107

To achieve high performance in the control of electrical drives,more and more attention was paid to the uncertainty and disturbance *** paper is focused on the speed control of permanent-magnet DC(PMDC) motor subjected to uncertainties and *** uncertainties and disturbances in the nonlinear system are lumped together as a total disturbance.A new control input is introduced to replace the original input and the total disturbance.A controller-design-oriented model is completed based on the new control *** a speed tracking controller is derived from the controller-design-oriented model by using triple-step nonlinear *** that,an extended state observer(ESO) is designed to estimate the total disturbance by using the output error between the controller-design-oriented model and the ***,the proposed disturbance attenuation method is carefully verified by *** results show that the proposed control scheme has a better control performance.

关键词： Permanent-Magnet DC Motor Speed control Triple-step Method Uncertainty and Disturbance Observer

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Cover Feature: Integrating Catalysis of Methane Decomposition and Electrocatalytic Hydrogen Evolution with Ni/CeO2for Improved Hydrogen Production Efficiency (ChemSusChem 5/2019)

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ChemSusChem 2019年第5期12卷 959-959页

作者： Cai Zhang Prof. Wei Zhang Dr. Nicholas E. Drewett Xiyang Wang Seung Jo Yoo Dr. Haoxiang Wang Dr. Ting Deng Dr. Jin-Gyu Kim Prof. Hong Chen Prof. Keke Huang Prof. Shouhua Feng Prof. Weitao Zheng State Key Laboratory of Automotive Simulation and Control and School of Materials Science & Engineering and Electron Microscopy Center and International Center of Future Science Jilin University Changchun 130012 P.R. China CIC Energigune Miñano 01510 Spain IKERBASQUE Basque Foundation for Science Bilbao 48013 Spain State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of Chemistry Jilin University Changchun 130012 P.R. China Electron Microscopy Research Center Korea Basic Science Institute Daejeon 34133 South Korea

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Characteristics and mixing state of S-rich particles in haze episodes in Beijing

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Frontiers of Environmental Science & Engineering 2016年第5期10卷 59-68页

作者： Jun Hu Fengkui Duan Kebin He Yongliang Ma Shuping Dong Xiande Liu State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing 100084 China State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex Tsinghua University Be(jing 100084 China Beijing Key Laboratory of Indoor Air Quality Evaluation and Control (Tsinghua University) Beijing 100084 China Sino-Japan Friendship Environmental Protection Center Beijing 100029 China Chinese Research Academy of Environmental Sciences Beijing 100029 China

Direct individual analysis using Scanning Electron Microscopy combined with online obscrv ation was conducted to examine the S-rich particles in PM2.5 of two typical polluted haze cpisodes in summer and winter from 2014 to 2015 in Beijing. Four major types of S-rich particles, including sccondary CaSO4 particles （mainly observed in summer）, S-rich mineral particles （SRM）, S-rich water droplets （SRW） and （C, O, S）-rich particles （COS） were identified. We lbund the differcnt typical morphologies and element distributions of S-rich particles and considered that （C, O, S）-rich parliclcs had two major mixing states in different seasons. On the basis of the S-rich particles＂ relative abundances. S concentrations and their relationships with PM2.5 as well as the seasonal comparison, wc revealed that the S-participated formation degrees of SRM and SRW would enhance with increasing PM2.5 concentration. Moreover, C-rich matter and sulfate had seasonally differcnt but significant impacts on the formation of COS.

关键词： S-rich particles Morphology Element distribution Mixing state

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Channel Modeling for Low-Altitude UAV in Suburban Environments Based on Ray Tracer

Channel Modeling for Low-Altitude UAV in Suburban Environmen...

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European Conference on Antennas and Propagation

作者： Xi Chu Cesar Briso Danping He Xuefeng Yin Jianwu Dou College of Electronics and Information Engineering Tongji University Shanghai 201804 China College of Telecommunications Engineering Technical University of Madrid Madrid 28040 Spain State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University 100044 Beijing China Wireless Algorithm Department Product R&D system ZTE corporation 201210 Shanghai China

ISBN: (纸本)9781785618154;9781785618161

Small and medium-size unmanned aircraft vehicles (UAVs) can only fly within short distance and ultra low altitude (<100m). It is of great interest to model the propagation in these conditions where there is an important influence of the environment. For the high cost of carrying out measurements and the safety concern, ray-tracing technique is considered to be a proper way for investigating the low altitude UAV channel. This paper presents simulation results based on ray tracing technique which simulates the air-to-ground (AG) channel of small UAVs at different heights in a realistic suburban scenario. Some parameters including path loss, K factor, number of paths, and delay spread are analyzed and show obvious height-dependency. During the ascending progress of the UAV, the multipath components diminish and finally only line of sight (LoS) component remains. The results and analysis can serve as a guidance for modeling ultra-low -altitude UAV channel.

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