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陶瓷膜技术处理低温低浊排泥水的研究进展

黑龙江科学 2024年第4期15卷 34-36,40页

作者：黄瑜许铁夫赵路阳陈悦佳王曼叶文飞宋晓晓黑龙江大学建筑工程学院哈尔滨150080 黑龙江省科学院高技术研究院哈尔滨150080 上海勘测设计院上海200120

目前,我国净水厂反冲洗水量和排泥水总量较高,越来越多的研究认为排泥水是挖掘城市水资源利用的重要组成部分。但低温低浊排泥水由于其特殊的水质特性使得对其处理回用具有挑战性。分析了低温低浊排泥水的水质特性,总结了其难处理的原因... 详细信息

目前,我国净水厂反冲洗水量和排泥水总量较高,越来越多的研究认为排泥水是挖掘城市水资源利用的重要组成部分。但低温低浊排泥水由于其特殊的水质特性使得对其处理回用具有挑战性。分析了低温低浊排泥水的水质特性,总结了其难处理的原因,综述了利用陶瓷膜处理技术处理低温低浊的研究进展及陶瓷膜技术的优点,对其进行评价,指出陶瓷膜技术存在的问题及未来发展趋势。

关键词：净水厂排泥水回收率低温低浊水陶瓷膜

Meridional deflection of global eddy propagation derived from tandem altimetry: Mechanism and implication

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Science China Earth Sciences 2024年第3期67卷 811-825页

作者： Ge chen Xiaoyan chen Frontiers Science Center for Deep Ocean Multispheres and Earth System School of Marine TechnologyOcean University of ChinaQindao 266100China Laboratory for Regional Oceanography and Numerical Modeling Laoshan LaboratoryQindao 266237China

A common view on meridional deflection of eddy propagation is poleward for cyclones and equatorward for anticyclones. This widely accepted polarity-sensitive pattern has been increasingly undermined given that it is systematically violated on both zonal and regional scales as recently reported. Here, we approach the problem by exploring these violations in terms of eddy effects of spatiotemporal geostrophy, thermal fading, and flow dragging, yielding the following main conclusions.(1) The polarity-dependent deflection discrepancy is a pseudo feature resulting from a biased fit to the normalized eddy tracks which are spatially asymmetric(though azimuthally symmetric) between the two signs;Instead, the primary pattern of eddy deflection appears to be geographically correlated and polarity independent.(2) Geostrophic adjustment plays a critical role in defining the meridional movement of an eddy. Specifically, a consistent poleward(equatorward) trajectory bending of spatially(temporally) ageostrophic eddies is observed irrespective of their polarity.(3) The mechanism of eddy deflection is also determined by its zonal propagation direction. Westward propagating eddies are substantially affected by thermal fading, while opposite ones by flow dragging. A realistic and comprehensive understanding of eddy deflection mechanisms serves as a significant contribution to the prediction of eddy trajectory, and the protection of ocean environment.

关键词： Mesoscale eddies Eddy propagation Eddy meridional deflection Satellite observation Geostrophic adjustment

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A refined representation method of the particle size distribution curve based on grading entropy

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Particuology 2024年第5期88卷 302-311页

作者： Xing Li Qun chen Zhaozhao Liu cheng Zhou chen Wang chen chen State Key Laboratory of Hydraulics and Mountain River Engineering College of Water Resource and HydropowerSichuan UniversityChengdu610065China

The particle size distribution(PSD)curve is an important expression of the basic properties of the *** characteristic parameters such as median particle size D_(50),effective particle size D_(10),and some combinations of characteristic parameters can only represent some points of the PSD curve,failing to represent all information of the PSD *** this paper,a fraction characteristic parameter F that could reflect the fraction size variation of the PSD curve was introduced based on grading *** a new presentation method of the A-B-F three parameters was proposed for a refined representation of the PSD *** was found that the newly constructed model not only better represents the differences in the width of PSD curves but also has a higher sensitivity than the A-B two-parameter model proposed by Lő*** PSD curves with similar distributions,the new presentation method has a higher degree of discrimination than that of the D_(50)-C_(u)-C_(c) three-parameter or the four-parameter combination G_(c) proposed by ***,the application of this new method in describing the spatial nonuniformity distribution of depositions and predicting the soil hydraulic conductivity was *** research results can provide a reference for the refined representation of PSD curves.

关键词： Grading entropy Particle size distribution curve Refined representation

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冷冻温度对冻融污泥有机物变化的影响

哈尔滨工业大学学报 2015年第4期47卷 1-8页

作者：陈悦佳赵庆良柳成才哈尔滨工业大学市政环境工程学院哈尔滨150090 哈尔滨工业大学建筑设计研究院哈尔滨150090

为了明确冷冻温度对冻融处理剩余污泥时有机物变化的影响,寻求最佳的冻融处理方式,考查了-20、-10以及-5℃条件下冷冻,再于20℃融化后污泥中有机物质量浓度的变化,并通过红外光谱分析冻融污泥中有机物组分的变化.结果表明,冻融后的污泥... 详细信息

为了明确冷冻温度对冻融处理剩余污泥时有机物变化的影响,寻求最佳的冻融处理方式,考查了-20、-10以及-5℃条件下冷冻,再于20℃融化后污泥中有机物质量浓度的变化,并通过红外光谱分析冻融污泥中有机物组分的变化.结果表明,冻融后的污泥内固体物质溶出主要发生在未完全冷冻阶段,延长冷冻时间,固体破解程度趋于稳定.完全冷冻即进入固化阶段（-20℃时2.5 h;-10℃时3~4 h;-5℃时4~6 h）的污泥,污泥絮体网状结构被破坏;融化后,污泥胞内有机物大量溶出.在-5/20℃条件下冻/融,污泥上清液中亲水性有机物（hydrophilic fraction,HPI）组分所占比例增加到59.3%,并可较彻底地破解污泥胞外有机物（extracellular biological organic matter,EBOM）疏水性组分中的蛋白质,同时烃类及糖类化合物吸收峰在处理后显著增加.相对-20/20℃条件下冻/融,-5/20℃下冻/融可以更好地释放污泥胞内有机物并改善污泥的可生化性.为了获得更好的冻融效果,可在-5℃的条件下进行冷冻,当污泥完全冷冻后（即冷冻4~6 h）再将污泥转入相对较低的冷冻温度条件下进行后续的固化,最后在室温条件下融化.

关键词：剩余污泥冻融冷冻温度有机物胞外聚合物

Track correlation algorithm based on CNN-LSTM for swarm targets

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Journal of Systems Engineering and Electronics 2024年第2期35卷 417-429页

作者： chen Jinyang WANG Xuhua chen Xian Research Institute for National Defense Engineering Academy of Military SciencesLuoyang 471023China Information Engineering University Zhengzhou 450001China School of Computer Science and Technology Xidian UniversityXi’an 710071China

The rapid development of unmanned aerial vehicle(UAV) swarm, a new type of aerial threat target, has brought great pressure to the air defense early warning system. At present, most of the track correlation algorithms only use part of the target location, speed, and other information for *** this paper, the artificial neural network method is used to establish the corresponding intelligent track correlation model and method according to the characteristics of swarm ***, a route correlation method based on convolutional neural networks (CNN) and long short-term memory (LSTM)Neural network is designed. In this model, the CNN is used to extract the formation characteristics of UAV swarm and the spatial position characteristics of single UAV track in the formation,while the LSTM is used to extract the time characteristics of UAV swarm. Experimental results show that compared with the traditional algorithms, the algorithm based on CNN-LSTM neural network can make full use of multiple feature information of the target, and has better robustness and accuracy for swarm targets.

关键词： track correlation correlation accuracy rate swarm target convolutional neural network(CNN) long short-term memory(LSTM)neural network

Two-stage Planning Method for Energy Router Considering Its Optimal Operation in Distribution Networks

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CSEE Journal of Power and Energy Systems 2024年第2期10卷 605-616页

作者： Meifu chen Mingchao Xia Qifang chen School of Electrical Engineering Beijing Jiaotong UniversityBeijing 100044China

An energy router can effectively optimize the network loss and power quality of distribution networks. The optimal configuration of the energy router is relatively complex because issues dynamically influence each other, such as the location of the energy router, optimal number and capacity of its ports, and building new distribution lines for the ports. Presently, there has been very few research studies on the practical problems for the energy router. In this paper, a planning model of an energy router combined with the distribution network is established, which fully exploits the active and reactive power control abilities of the energy router to optimize the operation of the grid. The configuration problem is decoupled into two stages. The upper layer determines the location of the energy router and the parameters of the candidate new distribution lines for the ports. The lower layer calculates the optimal configuration of the energy router by minimizing the total annual cost. Because of the same rated bus voltage in the distribution network, the existing structure of the energy router is changed to be more applicable for the distribution network, and then the power flow model of the energy router is also modified. Due to the nonlinearity of the model, the planning model is converted into a mixed-integer second-order cone model to solve efficiently. In addition, some core factors influencing the optimal scheme of the energy router are also analyzed in this paper. Simulation results show that the optimal scheme of the energy router can significantly improve the economic deployment of the energy router, and optimize the network loss and power quality of the distribution network.

关键词： Capacity allocation distribution network energy router optimal operation

Aerial target threat assessment based on gated recurrent unit and self-attention mechanism

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Journal of Systems Engineering and Electronics 2024年第2期35卷 361-373页

作者： chen chen QUAN Wei SHAO Zhuang School of Automation Beijing Institute of TechnologyBeijing 100081China State Key Laboratory of Intelligent Control and Decision of Complex Systems Beijing 100081China

Aerial threat assessment is a crucial link in modern air combat, whose result counts a great deal for commanders to make decisions. With the consideration that the existing threat assessment methods have difficulties in dealing with high dimensional time series target data, a threat assessment method based on self-attention mechanism and gated recurrent unit(SAGRU) is proposed. Firstly, a threat feature system including air combat situations and capability features is established. Moreover, a data augmentation process based on fractional Fourier transform(FRFT) is applied to extract more valuable information from time series situation features. Furthermore, aiming to capture key characteristics of battlefield evolution, a bidirectional GRU and SA mechanisms are designed for enhanced ***, after the concatenation of the processed air combat situation and capability features, the target threat level will be predicted by fully connected neural layers and the softmax classifier. Finally, in order to validate this model, an air combat dataset generated by a combat simulation system is introduced for model training and testing. The comparison experiments show the proposed model has structural rationality and can perform threat assessment faster and more accurately than the other existing models based on deep learning.

关键词： target threat assessment gated recurrent unit(GRU) self-attention(SA) fractional Fourier transform(FRFT)

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P2YRs结构及药理学研究进展

生命的化学 2023年第1期43卷 86-95页

作者：王欣陈悦嘉虞沂西藏大学医学院拉萨850011 四川大学生物治疗国家重点实验室成都610041 武汉大学药学院组合生物合成与新药发现教育部重点实验室武汉430071

P2Y受体家族(P2Y receptors,P2YRs)是嘌呤能受体家族成员之一,同时从属于G蛋白偶联受体家族(G-protein-coupled receptors,GPCRs)。它广泛表达于机体的各类细胞中,与许多重大疾病的发生密切相关,显示出作为药物靶点的巨大潜力。本文将介... 详细信息

P2Y受体家族(P2Y receptors,P2YRs)是嘌呤能受体家族成员之一,同时从属于G蛋白偶联受体家族(G-protein-coupled receptors,GPCRs)。它广泛表达于机体的各类细胞中,与许多重大疾病的发生密切相关,显示出作为药物靶点的巨大潜力。本文将介绍P2YRs的结构特征、分类及信号转导机制,从P2YRs的药理学活性着手,重点阐述P2YRs现有配体药物及潜在成药靶点的研究进展,以期为相关临床治疗药物的研发提供新思路。

关键词： P2Y受体家族 G蛋白偶联受体拮抗剂激动剂心脑血管疾病癌症神经性疼痛炎症

Planning Model for Energy Routers Considering Peer-to-Peer Energy Transactions Among Multiple Distribution Networks

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CSEE Journal of Power and Energy Systems 2024年第3期10卷 1026-1043页

作者： Meifu chen Mingchao Xia Qifang chen School of Electrical Engineering Beijing Jiaotong UniversityBeijing 100044China IEEE

A high proportion of renewable energy affects the power quality of distribution networks,and surplus energy will be sold to the upstream grid at a low *** this paper,considering peer-to-peer energy transactions,the energy router-based multiple distribution networks are analyzed to solve the above problems and realize collaborative consumption of renewable ***,the investing cost of an energy router is high,and research on the economic operation of energy routers in distribution networks is ***,this paper establishes a planning model for energy routers considering peer-to-peer energy transactions among distribution networks,and explores the benefits of peer-to-peer energy transactions through energy router based multiple distribution networks.A structure of an energy router suitable for peer-to-peer energy transactions is selected,and a power flow calculation model based on a multilayer structure is *** energy router’s scheduling model is established,and unique functions of the energy router and revenue of each distribution network are considered.A power flow calculation model based on peer-to-peer interconnection of multiple distribution networks through energy routers is also ***,simulation results verify the effectiveness of the proposed planning *** show that peer-topeer energy transaction among distribution networks through energy routers can effectively reduce the comprehensive cost of distribution networks,significantly improve the power quality of the distribution networks,and reduce the impact of power fluctuation on the upstream grid incurred by the distribution network.

关键词： Capacity allocation energy router multiple distribution networks peer-to-peer energy transaction power flow optimization