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A new scheme of PM_(2.5)and O_(3) control strategies with the integration of SOM,GA and WRF-CAMx

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Journal of Environmental Sciences 2024年第4期138卷 249-265页

作者： Wenjiao Duan Xiaoqi wang shuiyuan Cheng Ruipeng wang Key Laboratory of Beijing on Regional Air Pollution Control Faculty of Environment and LifeBeijing University of TechnologyBeijing 100124China

Previous air pollution control strategies didn’t pay enough attention to regional collaboration and the spatial response sensitivities,resulting in limited control effects in *** study proposed an effective PM_(2.5)and O_(3) control strategy scheme with the integration of Self-Organizing Map(SOM),Genetic Algorithm(GA)and WRF-CAMx,emphasizing regional collaborative control and the strengthening of control in sensitive *** scheme embodies the idea of hierarchical management and spatial-temporally differentiated management,with SOM identifying the collaborative subregions,GA providing the optimized subregion-level priority of precursor emission reductions,and WRF-CAMx providing response sensitivities for grid-level priority of precursor emission *** Beijing-Tianjin-Hebei and the surrounding area(BTHSA,“2+26”cities)as the case study area,the optimized strategy required that regions along Taihang Mountains strengthen the emission reductions of all precursors in PM_(2.5)-dominant seasons,and strengthen VOCs reductions but moderate NOx reductions in O_(3)-dominant *** spatiotemporally differentiated control strategy,without additional emission reduction burdens than the 14th Five-Year Plan proposed,reduced the average annual PM_(2.5)and MDA8 O_(3) concentrations in 28 cities by 3.2%-8.2% and 3.9%-9.7% respectively in comparison with non-differential control strategies,with the most prominent optimization effects occurring in the heavily polluted seasons(6.9%-18.0%for PM_(2.5)and 3.3%-14.2% for MDA8 O_(3),respectively).This study proposed an effective scheme for the collaborative control of PM_(2.5)and O_(3) in BTHSA,and shows important methodological implications for other regions suffering from similar air quality problems.

关键词： PM_(2.5)and O_(3)control SOM GA WRF-CAMx Bionic algorithm Machine learning

A non-volatile AND gate based on Al2O3/HfO2/Al2O3 charge-trap stack for in-situ storage applications

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Science Bulletin 2019年第20期64卷 1518-1524页

作者： Jingyu Li Heng Zhang Yi Ding Jiayi Li shuiyuan wang David Wei Zhang Peng Zhou State Key Laboratory of ASIC and System School of Microelectronics Fudan University

The emergence of two-dimensional(2 D) materials has inspired academia in microelectronics to find a novel device structure to offer a potential technological route for increasing energy efficiency and processing speed for data storage and computing at transistor level. Devices based on 2 D materials include logic gates and memories, each with their own unique features. However, integrating logic function and memory into a single device has barely been studied. Here, we report a non-volatile AND gate based on Al2O3/HfO2/Al2O3 charge-trap stack. The device can store charges after completing logic operation. The ratio of high and low current states during logic operations can exceed 105. The output current states during the logic and memory operations still have a two orders of magnitude distinction after 800 s, indicating that this device possesses the non-volatile characteristic. The device has potential applications for insitu memory applications, which makes it a possible candidate to break the ‘‘memory wall' at transistor level.

关键词： AND gate Non-volatile memory Charge-trap gate stack In-situ memory

Determining an optimal control strategy for anthropogenic VOC emissions in China based on source emissions and reactivity

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Journal of Environmental Sciences 2024年第2期136卷 248-260页

作者： Ruipeng wang Xiaoqi wang shuiyuan Cheng Jiaxian Zhu Xinyu Zhang Long Cheng Kai wang Key Laboratory of Beijing on Regional Air Pollution Control Faculty of Environment and LifeBeijing University of TechnologyBeijing 100124China

An evidence-based control strategy for emission reduction of VOC sources can effectively solve the regional PM2.5and O3compound pollution in *** estimated the anthropogenic VOC emission inventory in China in 2018 and established a source profile database containing 129 sources based on localized detection and the latest research ***,the distribution of the ozone formation potential(OFP)and secondary organic aerosol formation potential(SOAFP)for emission sources was ***,priority control routes for VOC emission sources were proposed for different *** VOC emissions in China reached 27,211.8 Gg in 2018,and small passenger cars,industrial protective coatings,biomass burning,heavy trucks,printing,asphalt paving,oil storage and transportation,coking,and oil refining were the main *** protective coatings,small passenger cars,and biomass burning all contributed significantly to OFP and *** in emission reduction control should be given to industrial protective coatings,small passenger cars,heavy trucks,coking,printing,asphalt paving,chemical fibers,and basic organic chemical sources over the medium and long term in *** addition,the priority control route for VOC emission sources should be adjusted according to the variations in VOC emission characteristics and regional differences,so as to obtain the maximum environmental benefits.

关键词： Volatile organic compounds Anthropogenic emission inventory Reactivity Emission projection Priority control route

Aerosol-radiation interaction and its variation in North China within 2015–2019 period under continuous PM_(2.5)improvements

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Journal of Environmental Sciences 2024年第2期136卷 81-94页

作者： Zhe Lv Xiaoqi wang Wei Wei Huahua Bai Xiaoyu Liu Guohao Li shuiyuan Cheng Department of Environmental Science and Engineering Beijing University of TechnologyBeijing 100124China Key Laboratory of Beijing on Regional Air Pollution Control Beijing 100124China Beijing Municipal Research Institute of Eco-Environmental Protection Beijing 100037China Beijing Key Laboratory of Urban Atmospheric Volatile Organic Compounds Pollution Control and Application Beijing 100037China

A study was conducted on aerosol-radiation interactions over six cities in this region within the 2015–2019 ***-Chem simulations on 2017 showed that based on the six-city average,the aerosol load(PM_(2.5)concentrations)of 121.9,49.6,43.3,and 66.3μg/m^(3)in January,April,July,and October,mainly lowered the level of downward shortwave radiation by 38.9,24.0,59.1,and 24.4 W/m~2and reduced the boundary layer height by 79.9,40.8,87.4,and 31.0 m,via scattering and absorbing solar *** sensitivity of meteorological changes to identical aerosol loads varied in the order July>January>October and ***,the cooling and stabilizing effects of aerosols further led to increases in PM_(2.5),by23.0,3.4,4.6,and 7.3μg/m^(3)respectively in the four *** sensitivity of the effect of aerosols on PM_(2.5)was greatest in January rather than in July,contrary to the effect on ***,a negative linear relation was observed between daily BLH reductions and aerosol loads in fall and winter,and between PM_(2.5)increases and aerosol loads in all *** the PM_(2.5)pollution improvements in this region,the aerosol radiative forcing was effectively *** should result in daily BLH increases of 10–24 m in fall and winter,and the estimates in Beijing agreed well with the corresponding results based on AMDAR ***,the reduction in aerosol radiation effects brought about daily PM_(2.5)decreases of 1.6-2.8μg/m^(3),accounting for 7.0%–17.7%in PM_(2.5)improvements.

关键词： Radiative forcing Aerosol PM_(2.5) Boundary layer height(BLH) North China

Magnetic Field Controllable Photocurrent Properties in BiFe_(0.9)Ni_(0.1)O_(3)/La_(0.7)Sr_(0.3)MnO_(3) Laminate Thin Film

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Energy & Environmental Materials 2024年第2期7卷 381-388页

作者： Guanzhong Huo Ke wang Qingying Ye shuiyuan Chen Chao Su Yuxiang Zhang Guilin Chen Zhigao Huang Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials College of Physics and EnergyFujian Normal UniversityFuzhou 350117China Fujian Provincial Engineering Technology Research Center of Solar Energy Conversion and Energy Storage Fuzhou 350117China

This paper reports a multifunctional magnetic-photoelectric laminate device based on the integration of spintronic material(La_(0.7)Sr_(0.3)MnO_(3))and multiferroic(Ni-doped BiFeO_(3)),in which the repeatable modulation effect on the photoelectric properties were achieved by applying external magnetic *** obviously,photocurrent density(J)of the laminate was largely enhanced,the change rate of J up to 287.6%is *** sensing function effect should be attributed to the low-field magnetoresistance effect in perovskite manganite and the scattering of spin photoelectron in multiferroic *** laminate perfectly combines the functions of sensor and controller,which can not only reflect the intensity of environmental magnetic field,but also modulate the photoelectric conversion *** work provides an alternative and facile way to realize multi-degree-of-freedom control for photoelectric conversion performances and lastly miniaturize multifunction device.

关键词： bismuth ferrite low-field magnetoresistance effect magnetic field modulation perovskite manganite photocurrent

A Photoelectric-Stimulated MoS_(2) Transistor for Neuromorphic Engineering

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Research 2019年第1期2019卷 273-282页

作者： shuiyuan wang Xiang Hou Lan Liu Jingyu Li Yuwei Shan Shiwei Wu David Wei Zhang Peng Zhou ASIC&System State Key Lab. School of MicroelectronicsFudan UniversityShanghai 200433China Department of Physics State Key Laboratory of Surface PhysicsKey Laboratory of Micro and Nano Photonic Structures(Ministry of Education)and Institute for Nanoelectronic Devices and Quantum ComputingFudan UniversityShanghai 200433China

The von Neumann bottleneck has spawned the rapid expansion of neuromorphic engineering and brain-like *** serve as bridges for information transmission and connection in the biological nervous *** direct implementation of neural networks may depend on novel materials and devices that mimic natural neuronal and synaptic *** exploiting the interfacial effects between MoS_(2) and AlOx,we demonstrate that an h-BN-encapsulated MoS_(2) artificial synapse transistor can mimic the basic synaptic behaviors,including EPSC,PPF,LTP,and *** optoelectronic spikes enable simulation of synaptic gain,frequency,and weight *** Pavlov classical conditioning experiment was successfully simulated by electrical tuning,showing associated learning *** addition,h-BN encapsulation effectively improves the environmental time stability of our *** h-BN-encapsulated MoS_(2) artificial synapse provides a new paradigm for hardware implementation of neuromorphic engineering.

关键词： tuning optoelectronic artificial

基于政府与村民双向需求的乡村规划探索——以安徽省当涂县龙山村美好乡村规划为例

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现代城市研究 2014年第4期29卷 16-23页

作者：李伟徐建刚陈浩王水源南京大学建筑与城市规划学院南京大学地理与海洋科学学院

乡村规划建设越来越受到社会各界的重视,长期以来单向需求导向下的建设模式致使乡村规划建设一度遇到瓶颈并流于表面。本文以当涂县龙山村美好乡村规划为实践基础,引入马斯洛需求层次理论,从人居、生态、公共服务设施、体制和产业五个... 详细信息

乡村规划建设越来越受到社会各界的重视,长期以来单向需求导向下的建设模式致使乡村规划建设一度遇到瓶颈并流于表面。本文以当涂县龙山村美好乡村规划为实践基础,引入马斯洛需求层次理论,从人居、生态、公共服务设施、体制和产业五个方面探求政府和本地乡村居民对村庄规划建设的多维期许,并基于总体和详细两个规划层面探讨了乡村规划中双向需求的落实与协调策略,以期能为目前的乡村建设活动提供参考借鉴。

关键词：乡村规划马斯洛需求层次理论双向需求规划对策龙山村

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自适应权重更新的轻量级视频目标分割算法

中国图象图形学报 2023年第12期28卷 3772-3783页

作者：汪水源侯志强李富成马素刚余旺盛西安邮电大学计算机学院西安710121 西安邮电大学陕西省网络数据分析与智能处理重点实验室西安710121 空军工程大学信息与导航学院西安710077

目的针对现有视频目标分割(video object segmentation,VOS)算法不能自适应进行样本权重更新,以及使用过多的冗余特征信息导致不必要的空间与时间消耗等问题,提出一种自适应权重更新的轻量级视频目标分割算法。方法首先,为建立一个具有... 详细信息

目的针对现有视频目标分割(video object segmentation,VOS)算法不能自适应进行样本权重更新,以及使用过多的冗余特征信息导致不必要的空间与时间消耗等问题,提出一种自适应权重更新的轻量级视频目标分割算法。方法首先,为建立一个具有较强目标判别性的算法模型,所提算法根据提取特征的表征质量,自适应地赋予特征相应的权重;其次,为了去除冗余信息,提高算法的运行速度,通过优化信息存储策略,构建了一个轻量级的记忆模块。结果实验结果表明,在公开数据集DAVIS2016(densely annotated video segmentation)和DAVIS2017上,本文算法的区域相似度与轮廓准确度的均值J&F分别达到了85.8%和78.3%,与对比的视频目标分割算法相比具有明显的优势。结论通过合理且无冗余的历史帧信息利用方式,提升了算法对于目标建模的泛化能力,使目标掩码质量更高。

关键词：视频目标分割(VOS) 轻量级记忆模块权重更新自适应

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京津冀地区大气颗粒物组分污染特征

环境科学学报 2024年第8期44卷 22-34页

作者：强宇尧王晓琦王传达何帅龙程水源北京工业大学环境科学与工程学院区域大气复合污染防治北京市重点实验室北京100124

本研究对2014年、2018年、2021年京津冀地区典型城市PM_(2.5)与PM_(1)进行样品采集,对不同减排阶段的空气质量改善成效和组分变化开展研究分析.结果表明,大气污染防治行动计划期间,京津冀地区PM_(2.5)浓度与重污染天数持续降低,各城市PM... 详细信息

本研究对2014年、2018年、2021年京津冀地区典型城市PM_(2.5)与PM_(1)进行样品采集,对不同减排阶段的空气质量改善成效和组分变化开展研究分析.结果表明,大气污染防治行动计划期间,京津冀地区PM_(2.5)浓度与重污染天数持续降低,各城市PM_(2.5)浓度改善幅度为23%~51%,重污染天数下降率为50%~73%,北京、石家庄的SO_(4)^(2-)组分占比分别下降1.9%、1.0%,NO_(3)^(-)组分占比分别上升2.9%、5.4%;“蓝天保卫战”阶段京津冀地区PM_(2.5)浓度改善幅度为21%~35%,北京SO_(4)^(2-)和NO_(3)^(-)浓度下降,但占比分别上升3.5%、1.0%,石家庄SO_(4)^(2-)、NO_(3)^(-)浓度和占比均下降,占比分别下降1.1%、1.5%.北京、石家庄PM_(1)与PM_(2.5)浓度变化趋势相似,北京夏、秋、冬季PM_(1)中二次组分(SOA与SNA)的占比均高于PM_(2.5)中二次组分占比,且在灰霾天气较多的冬季占比最大.基于浓度权重轨迹分析方法(CWT)分析污染输送对两城市颗粒物的潜在影响,发现北京主要受西南传输通道和近周边地区传输影响,石家庄主要受京津冀近周边地区影响.

关键词： PM_(2.5) PM_(1) 组分特征组分差异区域传输京津冀