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New Multipole Method for 3-D Capacitance Extraction

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Journal of Computer Science & Technology 2004年第4期19卷 544-549页

作者： zhao-zhiyang Ze-YiWang DepartmentofComputerScienceandTechnology TsinghuaUniversityBeijing100084P.R.China

This paper describes an efficient improvement of the multipole accelerated boundary element method for 3-D capacitance extraction. The overall relations between the positions of 2-D boundary elements are considered instead of only the relations between the center-points of the elements, and a new method of cube partitioning is introduced. Numerical results are presented to demonstrate that the method is accurate and has nearly linear computational growth as O(n), where n is the number of panels/boundary elements. The proposed method is more accurate and much faster than Fastcap.

关键词： 3-D interconnect parasitic capacitance extraction IBEM (indirect boundary element method) electronic design automation parasitic parameter extraction VLSI simulation verification

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基于激光点云数据的管道破损定量检测技术

测绘通报 2024年第1期 120-125页

作者：李屹蔡意董思奇赵志阳陈琪长江地球物理探测(武汉)有限公司湖北武汉430010 城市智慧管网湖北省工程研究中心湖北武汉430010 长江生态环保集团有限公司湖北武汉430014

采用管道激光扫描技术可获取管道内表面的点云三维信息,解决了传统管道视频检测方法难以定量化检测的问题。本文针对管道破损缺陷的点云数据特点,利用统计滤波和半径滤波等点云滤波算法,实现了管道破裂处点云删除;基于随机一致性采样(RA... 详细信息

采用管道激光扫描技术可获取管道内表面的点云三维信息,解决了传统管道视频检测方法难以定量化检测的问题。本文针对管道破损缺陷的点云数据特点,利用统计滤波和半径滤波等点云滤波算法,实现了管道破裂处点云删除;基于随机一致性采样(RANSAC)算法实现了管道点云圆柱面投影和管道点云数据二维平面展开;通过网格化筛选和区域生长算法实现了管道点云数据破损缺陷检测及自动化分析。实测数据验证了该方法的可靠性和有效性,可以准确识别管道破损位置,并计算破损面积、纵向长度、环向长度等参数。

关键词：管道激光检测点云数据处理自动识别破损检测随机一致性采样

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基于物联网的智能鱼塘水质环境监测系统设计

无线互联科技 2024年第17期21卷 21-23页

作者：赵志阳张宸瑞赵轩毅高明阳大连理工大学城市学院辽宁大连116100

文章设计并实现了一种基于STM32的智能鱼塘水质环境监测系统。该系统旨在通过实时监测鱼塘水质参数,如温度、溶解氧、pH值、氨氮和亚硝酸盐,提供科学的养殖环境管理支持。系统硬件包括STM32微控制器、各类传感器、LCD显示屏和PC端软件,... 详细信息

文章设计并实现了一种基于STM32的智能鱼塘水质环境监测系统。该系统旨在通过实时监测鱼塘水质参数,如温度、溶解氧、pH值、氨氮和亚硝酸盐,提供科学的养殖环境管理支持。系统硬件包括STM32微控制器、各类传感器、LCD显示屏和PC端软件,软件架构则涵盖数据采集、处理、传输及用户界面模块,最后的实验结果验证了系统的有效性。

关键词：物联网智能鱼塘 STM32 水质监测

A Virtual Network Mapping Algorithm Based on Time

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Chinese Journal of Electronics 2014年第1期23卷 31-36页

作者： JIANG Ming zhao zhiyang ZHANG Min TANG Jingfan WU Chunming MIN Xiao Institute of Software and Intelligent Technology Hangzhou Dianzi University College of Computer Science and Technology Zhejiang University Mathematics and Information Engineering College of Jiaxing University

As one of the challenges for network virtualization, virtual network embedding which maps Virtual network(VN) to the substrate network and allocates resources according to the requirements of VN in an efficient way has gained great attention. Existing algorithms generally make their decision according to the present available substrate network resource, especially bandwidth. This paper proposes a time-based VN embedding algorithm. A probability model is formulated to obtain the maximum probability that the available resources of substrate network can be used by succeeding VN requests. The probability is set as the weight of the node and the greedy algorithm is employed to embed the virtual node. The reciprocal of the probability is set as the weight of the link and the shortest path algorithm is employed to embed the virtual link. Simulation experiments show that the proposed algorithm increases the acceptance rate and the revenue compared to the existing algorithms.

关键词： Network virtualization Time Probability Virtual network embedding

Shape-tailorable amine grafted silica aerogel microsphere for CO_(2) capture

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Green Chemical Engineering 2020年第2期1卷 140-146页

作者： Xing Jiang Jian Ren Yong Kong zhiyang zhao Xiaodong Shen Maohong Fan College of Materials Science and Engineering Nanjing Tech UniversityNanjing210009PR China Department of Chemical and Petroleum Engineering University of WyomingLaramieWY82071USA Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites Nanjing210009PR China School of Civil and Environmental Engineering Georgia Institute of TechnologyAtlantaGA30332USA Suqian Advanced Materials Industry Technology Innovation Center of Nanjing Tech University Suqian223800PR China

The purpose of this study was to prepare a proof-of-concept CO_(2) adsorbing material based on a new amine grafted silica aerogel microsphere(AGSAM)that could be used on both fixed and fluidized beds.A low-cost water glass and environment-friendly water were used as precursor and solvent of the silica aerogel,*** silica aerogel microsphere(SAM)was prepared by dropping the siliceous solution into hot oil *** effect of the pH value of the siliceous solution,stirring speed and stirring paddle position on the sphericity and size of the SAM was *** SAM with good sphericity was obtained when the pH value was 5.69–*** mean diameter of the SAM decreased from 5 to 1 mm when the stirring speed increased from 1000 to 2000 *** SAM with excellent sphericity was prepared when the paddle was placed on the top of the oil *** the paddle was placed at the middle and bottom of the oil bath,some liquid drops aggregated together and formed large *** was obtained by grafting the amine groups onto the framework of the silica gel *** CO2 adsorption capacity of the AGSAM was 1.04 mmol g^(-1) with 1%CO2 at 300 mL min^(-1).The AGSAM with 4,3.2,2 and 1 mm in diameters had the fluidizing velocities of 0.531,0.425,0.265 and 0.159 m s^(-1),*** AGSAM with different sizes met different fluidizing conditions.

关键词： Silica aerogel Microsphere Amine grafting CO_(2)adsorption

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深圳市宝安区手足口病经济负担及影响因素

护理研究 2024年第7期38卷 1262-1268页

作者：陈春艳仇丽霞赵执扬陈亿雄李静刘金凤李淑珍山西医科大学山西030001 深圳市宝安区人民医院深圳市宝安区疾病预防控制中心

目的:了解深圳市宝安区2021年手足口病经济负担并分析其影响因素。方法:收集某三级甲等医院2021年9月1日—12月1日就诊的1 225例手足口病病人,设计调查问卷,采用电话询问及医院信息系统查询收集资料,评估手足口病造成的经济负担并分析... 详细信息

目的:了解深圳市宝安区2021年手足口病经济负担并分析其影响因素。方法:收集某三级甲等医院2021年9月1日—12月1日就诊的1 225例手足口病病人,设计调查问卷,采用电话询问及医院信息系统查询收集资料,评估手足口病造成的经济负担并分析其影响因素。结果:1 225例病人中,门诊病人1 195例(97.55%),住院病人30例(2.45%),无重症病例。1 195例手足口病门诊病人的总体经济负担为422.57(336.70,604.54)元/例,30例手足口病住院病人的总体经济负担为(4 386.88±1 624.61)元/例。年龄、报销类型以及诊疗次数是手足口病门诊病人总体经济负担的影响因素(P<0.05)。结论:手足口病住院病人经济负担高于门诊病人,年龄、报销类型以及诊疗次数是手足口病门诊病人经济负担的影响因素。早发现、早诊断、早治疗能有效降低疾病经济负担。

关键词：手足口病经济负担影响因素

Construction of hierarchical FeNi_(3)@(Fe,Ni)S_(2) core-shell heterojunctions for advanced oxygen evolution

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Nano Research 2021年第11期14卷 4220-4226页

作者： Minglei Yan zhiyang zhao Peixin Cui Kun Mao Chi Chen Xizhang Wang Qiang Wu Hui Yang Lijun Yang Zheng Hu Key Laboratory of Mesoscopic Chemistry of MOE and Jiangsu Provincial Laboratory of Nanotechnology School of Chemistry and Chemical EngineeringNanjing UniversityNanjing210023China Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil Sciencethe Chinese Academy of SciencesNanjing210008China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai201210China

The investigation of earth-abundant electrocatalysts for efficient water electrolysis is of central importance in renewable energy system, which is currently impeded by the large overpotential of oxygen evolution reaction (OER). NiFe sulfides show promising OER activity but are troubled by their low intrinsic conductivities. Herein, we demonstrate the construction of the porous core-shell heterojunctions of FeNi3@(Fe,Ni)S_(2) with tunable shell thickness via the reduction of hierarchical NiFe(OH)x nanosheets followed by a partial sulfidization. The conductive FeNi3 core provides the highway for electron transport, and the (Fe,Ni)S_(2) shell offers the exposed surface for in situ generation of S-doped NiFe-oxyhydroxides with high intrinsic OER activity, which is supported by the combined experimental and theoretical studies. In addition, the porous hierarchical morphology favors the electrolyte access and O_(2) liberation. Consequently, the optimized catalyst achieves an excellent OER performance with a low overpotential of 288 mV at 100 mA·cm^(−2), a small Tafel slope of 48 mV·dec^(−1), and a high OER durability for at least 1,200 h at 200 mA·cm^(−2). This study provides an effective way to explore the advanced earth-abundant OER electrocatalysts by constructing the heterojunctions between metal and corresponding metal-compounds via the convenient post treatment, such as nitridation and sulfidization.

关键词： oxygen evolution reaction electrocatalysts Ni-Fe nitrides core-shell structure heterojunctions

Detection and Quantization Technique of Optical Distributed Acoustic Coupling Based onφ-OTDR

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Journal of Shanghai Jiaotong university(Science) 2020年第2期25卷 208-213页

作者： ZHANG Yang XU Hongxuan ZHU Xianxun zhao zhiyang ZUO Jiancun School of Computer and Information Engineering Shanghai Polytechnic UniversityShanghai 201209China Merchant Marine College Shanghai Maritime UniversityShanghai 201306China

The detection of multiple acoustic disturbances by optical fiber is a hot research topic in the field of optical fiber *** paper considers adopting an optical distributed acoustic sensing(DAS)system to detect multiple acoustic disturbances,proposes a new approach to processing the DAS signal based on time-space average in frequency domain,and overcomes the randomness of DAS time domain ***,it obtains a functional model of single-frequency(50-1000 Hz)sound pressure level and DAS signal intensity,and also the cut-off frequency of acoustic disturbance is detected by DAS system.

关键词： distributed acoustic sensing(DAS) sound pressure level time-space average quantitative analysis

小波-LSTM模型在肺结核发病趋势预测中的应用

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预防医学情报杂志 2024年第6期40卷 617-621页

作者：范瑾李珊珊冯语梦赵执杨贺生四川护理职业学院成都610100 中山大学广州510275

目的探讨小波-LSTM模型对肺结核发病率的预测效果,为防控肺结核提供参考。方法通过小波分解将2012-2018年中国肺结核发病率数据分解为高频序列和低频序列,对分解序列构建LSTM模型;利用2019年数据验证小波-LSTM、LSTM模型的预测性能。... 详细信息

目的探讨小波-LSTM模型对肺结核发病率的预测效果,为防控肺结核提供参考。方法通过小波分解将2012-2018年中国肺结核发病率数据分解为高频序列和低频序列,对分解序列构建LSTM模型;利用2019年数据验证小波-LSTM、LSTM模型的预测性能。结果在预测未来3个月时,LSTM模型效果最优,其MSE、MAE、RMSE分别为0.007、0.069、0.085;在预测未来12个月发病趋势时,小波-LSTM模型效果最优,其MSE、MAE、RMSE分别为0.046、0.156、0.215。结论小波-LSTM模型对肺结核发病率的长期预测效果优于LSTM模型,小波-LSTM模型在肺结核发病趋势预测分析中具有一定的应用价值。

关键词：肺结核小波-LSTM模型 LSTM模型