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基于灰度共生矩阵的草地未割区域分界线提取

杭州电子科技大学学报（自然科学版） 2016年第2期36卷 62-66,71页

作者：童逸舟刘瑜浙江理工大学机械与自动控制学院浙江杭州310018

利用草地的灰度图像计算灰度共生矩阵,通过比较"自相关"、"对比度"、"能量"、"均匀性"4个不同的特征值矩阵,提取出纹理分割效果最佳的二值图像,然后将二值图横向分割成若干宽度相同的横条,通过计算单条横条内黑色像素点的占有比确定历... 详细信息

利用草地的灰度图像计算灰度共生矩阵,通过比较"自相关"、"对比度"、"能量"、"均匀性"4个不同的特征值矩阵,提取出纹理分割效果最佳的二值图像,然后将二值图横向分割成若干宽度相同的横条,通过计算单条横条内黑色像素点的占有比确定历遍轮廓大小进而找出分割点坐标,最后将每个横条分割点用直线连起来.实验表明,利用灰度共生矩阵能较好地将未割草地的纹理特性提取出来,并通过后期算法处理能相对准确地进行分界线的提取.

关键词：草地分割灰度共生矩阵特征值矩阵历遍轮廓

基于模糊层次分析法的核安全设备持证单位量化评价研究

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核安全 2021年第5期20卷 16-20页

作者：童一周徐俊龙崔毅生态环境部华北核与辐射安全监督站北京100082

本文从民用核安全设备持证单位监督管理角度出发,综合考虑核安全法律法规及国家核安全局各项监管要求,结合监督实践活动,采用模糊层次分析法(FAHP)对持证单位核安全监督管理量化评价的指标和方法进行了研究。通过构建包含6个准则,近80... 详细信息

本文从民用核安全设备持证单位监督管理角度出发,综合考虑核安全法律法规及国家核安全局各项监管要求,结合监督实践活动,采用模糊层次分析法(FAHP)对持证单位核安全监督管理量化评价的指标和方法进行了研究。通过构建包含6个准则,近80个次级指标的动态评价体系,建立量化评价数学模型。此外,以具体持证单位为例,对其连续3年的监督记录进行了量化分析,得出量化评价结论,识别其存在的薄弱环节,并提出监管建议。该评价方法对实现精准监督、科学决策、依法行政起到了积极作用。

关键词：核安全设备模糊层次量化评价

黏蛋白-4和基质金属蛋白酶-7在种植体周病中的表达及意义

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华西口腔医学杂志 2022年第1期40卷 45-51页

作者：姜丹丹周政沈玉凤唐小雪缑小蕊黄枚钰童一洲陈苗苗余重庆石河子大学医学院第一附属医院口腔科石河子832000 石河子大学口腔医学系石河子832000

目的探讨基质金属蛋白酶(MMP)-7、MMP-8和黏蛋白(MUC)-4在种植体周围龈沟液(PICF)中的水平,分析二者是否具有区分种植体周围疾病与健康个体的能力,以期为寻找辅助种植体周围疾病诊断、评估和治疗的新型参考指标提供理论基础。方法按照... 详细信息

目的探讨基质金属蛋白酶(MMP)-7、MMP-8和黏蛋白(MUC)-4在种植体周围龈沟液(PICF)中的水平,分析二者是否具有区分种植体周围疾病与健康个体的能力,以期为寻找辅助种植体周围疾病诊断、评估和治疗的新型参考指标提供理论基础。方法按照纳入和排除标准选择上部修复体负载2~5年的63位受试者,其中对照组24例,种植体周围炎(PI)组39例。收集受试者一般情况及种植体周围临床指标,X线片测量牙槽骨吸收量,酶联免疫吸附试验法(ELISA)检测PICF中的MUC-4、MMP-7、MMP-8水平。结果PI组和对照组受试者的年龄、性别等参数信息差异无统计学意义,PI组MMP-7(P21.21时,其曲线下面积为0.868,诊断PI的灵敏度为0.96、特异度为0.68;MMP-7、MUC-4并联诊断模型的诊断效能高于两种因子单独诊断,模型对PI的诊断灵敏度为0.96,特异度为0.56。结论MMP-7、MUC-4的水平在PI组与对照组之间差异有统计学意义,可能成为预测是否罹患PI的诊断指标;联合MMP-7、MUC-4对炎症具有较好的诊断价值。

关键词：种植体周围疾病黏蛋白-4 基质金属蛋白酶-7

Sol-gel transition effect based on konjac glucomannan thermosensitive hydrogel for photo-assisted uranium extraction

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Science Bulletin 2024年第19期69卷 3042-3054页

作者： Xudong Wu tong Liu Huimin Li yizhou He Guolin Yang Wenkun Zhu Tao Chen State Key Laboratory of Environment-friendly Energy Materials School of Life Science and EngineeringSchool of National Defense of Science and TechnologyNational Co-innovation Center for Nuclear Waste Disposal and Environmental SafetySichuan Civil-military Integration InstituteSouthwest University of Science and TechnologyMianyang 621010China College of Science National University of Defense TechnologyChangsha 410073China

Exploiting the intelligent photocatalysts capable of phase separation provides a promising solution to the removal of uranium,which is expected to solve the difficulty in separation and the poor selectivity of traditional photocatalysts in carbonate-containing uranium *** this paper,theγ-FeOOH/konjac glucomannan grafted with phenolic hydroxyl groups/poly-N-isopropylacrylamide(γ-FeOOH/KGM(Ga)/PNIPAM)thermosensitive hydrogel is proposed as the photocatalysts for extracting uranium from carbonate-containing uranium *** dynamic phase transformation is demonstrated to confirm the arbitrary transition ofγ-FeOOH/KGM(Ga)/PNIPAM thermosensitive hydrogel from a dispersed state with a high specific surface area at low temperatures to a stable aggregated state at high ***,theγ-FeOOH/KGM(Ga)/PNIPAM thermosensitive hydrogel achieves a remarkably high rate of 92.3%in the removal of uranium from the wastewater containing carbonates and maintains the efficiency of uranium removal from uranium mine wastewater at over 90%.Relying on electron spin resonance and free radical capture experiment,we reveal the adsorption-reduction-nucleation-crystalliza tion mechanism of uranium onγ-FeOOH/KGM(Ga)/PNIPAM thermosensitive ***,this strategy provides a promising solution to treating uranium-contaminated wastewater,showing a massive potential in water purification.

关键词： Carbonate-containing uranium wastewater Konjacglucomannan γ-FeOOH PNIPAM Temperature responsivehydrogel Photo-assisted uraniumextraction

Deformation characteristics and safety assessment of a high-speed railway induced by undercutting metro tunnel excavation

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Journal of Rock Mechanics and Geotechnical Engineering 2019年第1期11卷 88-98页

作者： Wangping Qian Taiyue Qi Yunjian Zhao yizhou Le Haiyang Yi Key Laboratory of Transportation Tunnel Engineering Ministry of Education Southwest Jiaotong University School of Civil Engineering Southwest Jiao tong University China Railway Design Corporation China Changjiang Construction Investment Corp.Ltd. North China Institute of Science and Technology

Stratum deformation(settlement) is a challenging issue in tunnel engineering, especially when construction of metro tunnels has to undercut high-speed railway. For this purpose, we used the FLAC30 software to analyze the stratum settlement characteristics of high-speed railway at different crossing angles intersected by metro tunnel, in terms of ground settlement trough, stratum slip line and irregularity of ballastless tracks. According to the evolution of the stratum settlement at different angle regions, an optimized angle is proposed for the actual project design. In order to reduce the influence of stratum settlement on the safety of high-speed railway, an approach of safety assessment is proposed for the shield engineering undercutting high-speed railway, as per Chinese specifications using numerical results and on-site conditions. A case study is conducted for the shield tunnel section crossing the Wuhan-Guangzhou High-speed Railway between the Guangzhou North Railway Station and the Huacheng Road Station, which represents the first metro tunnel project passing below a high-speed railway in China. A series of measures is taken to ensure the safe excavation of the shield tunnel and the operation of the high-speed railway. The results can provide a technical support for performing a safety evaluation between high-speed railways and metro tunnels.

关键词： Metro tunnel excavation High-speed railway Settlement characteristics Safety assessment Numerical simulation Case application

Zero-Inflated Exponential Distribution of Casualty Rate in Ship Collision

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Journal of Shanghai Jiaotong university(Science) 2019年第6期24卷 739-744页

作者： HUANG Daozheng HU Hao LI yizhou College of Transport and Communications Shanghai Maritime UniversityShanghai 201306China School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China

There are two weaknesses in current researches into human casualty of ship *** is that the range of injuries or fatalities is restricted to the maximum number of casualties in a particular sample,which may not cover all the possible numbers of casualties in the *** Maritime Organization(IMO)employed the injured or dead percentage of all the persons on board to represent casualties,but it only provided several discrete values to quantify human losses in different *** other is that the assumption that the distributions of the injuries or fatalities follow certain distribution,such as negative binomial and Poisson distributions is left to be statistically ***,this study considers casualty rate,including injury and fatality rates,as random variables;the interval of the variables are from 0 to ***,the distributions of the variables are investigated using historical *** historical data,we can find that there are many *** models are proved to be effective in processing data with inflated ***,the probability density of the variables decreases rapidly as the casualty rate becomes ***,zero-inflated exponential distribution is assumed to fit the *** parameters of zero-inflated exponential distribution are calibrated by maximum likelihood estimation(MLE)***,the assumption is tested by chi-square *** zeroinflated exponential distribution can be used to generate human losses as a part of consequences in the simulation of ship collision risk.

关键词： zero-inflated exponential distribution casualty rate collision maritime accident

Insulation characteristics of triple mixtures of c-C_4F_8/N_2/CO_2 under lightning impulse voltage

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Plasma Science and Technology 2018年第10期20卷 112-117页

作者： Zhouming ZHANG Zhaorui NI Dengming XIAO yizhou WU Department of Electrical Engineering Shanghai Jiao Tong University Shanghai 200030 People's Republic of China Michigan-Shanghai Jiaotong University Joint Institute Shanghai Jiao Tong University Shanghai 200240 People's Republic of China

This paper has researched the insulation characteristics of 10% c-C4F8/N2/CO2 mixtures under lightning impulse voltage by experiment. It is shown that the positive and negative lightning impulse breakdown voltages of 10%c-C4F8/N2/CO2 gas mixtures rise linearly as the electrode gap distance and gas pressure increase and under the same conditions, the positive lightning impulse breakdown voltage of the gas mixtures is always higher than the negative lightning impulse breakdown voltage. As the gas mixtures have a little higher liquefied temperature than SF6 and the comprehensive GWP is about 5% of SF6, and the positive and negative lightning impulse breakdown voltages can both reach 60% of SF6, 10%c-C4F8/N2/CO2 gas mixtures can be applied as insulation gas in electrical equipment such as C-GIS, GIT, GIL and so on.

关键词： SF6 alternative insulation characteristics lightning impulse voltage c-C4F8 gas mixtures

Recent advances in anode materials for potassium-ion batteries:A review

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Nano Research 2021年第12期14卷 4442-4470页

作者： Lianbo Ma Yaohui Lv Junxiong Wu Chuan Xia Qi Kang yizhou Zhang Hanfeng Liang Zhong Jin School of Materials Science and Engineering Anhui University of TechnologyMaanshan243002China Key Laboratory of Mesoscopic Chemistry of Ministry of Education(MOE) Jiangsu Key Laboratory of Advanced Organic MaterialsState Key Laboratory of Coordination ChemistrySchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing210023China Shenzhen Research Institute of Nanjing University Shenzhen518063China Department of Mechanical Engineering The Hong Kong Polytechnic UniversityKowloonHong KongChina School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu610054China Department of Polymer Science and Engineering Shanghai Key Laboratory of Electrical Insulation and Thermal AgeingShanghai Jiao Tong UniversityShanghai200240China Institute of Advanced Materials and Flexible Electronics(IAMFE) School of Chemistry and Materials SciencesNanjing University of Information Science&TechnologyNanjing210044China College of Chemistry and Chemical Engineering Xiamen UniversityXiamen361005China

Potassium-ion batteries(PIBs)are appealing alternatives to conventional lithium-ion batteries(LIBs)because of their wide potential window,fast ionic conductivity in the electrolyte,and reduced ***,PIBs suffer from sluggish K+reaction kinetics in electrode materials,large volume expansion of electroactive materials,and the unstable solid electrolyte *** strategies,especially in terms of electrode design,have been proposed to address these *** this review,the recent progress on advanced anode materials of PIBs is systematically discussed,ranging from the design principles,and nanoscale fabrication and engineering to the structure-performance ***,the remaining limitations,potential solutions,and possible research directions for the development of PIBs towards practical applications are *** review will provide new insights into the lab development and real-world applications of PIBs.

关键词： potassium-ion batteries anode materials nanoscale engineering electrode design

Establishing HI mass vs. stellar mass and halo mass scaling relations using an abundance matching method

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Science China(Physics,Mechanics & Astronomy) 2024年第11期67卷 149-163页

作者： Yi Lu Xiaohu Yang Chengze Liu Haojie Xu Antonios Katsianis Hong Guo Xiaoju Xu yizhou Gu Key Laboratory for Research in Galaxies and Cosmology Shanghai Astronomical ObservatoryChinese Academy of SciencesShanghai 200030China Tsung-Dao Lee Institute and Shanghai Key Laboratory for Particle Physics and CosmologyShanghai Jiao Tong UniversityShanghai 200240China Department of Astronomy School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China School of Physics and Astronomy Sun Yat-sen UniversityZhuhai CampusZhuhai 519082China

We combined data from the Sloan Digital Sky Survey(SDSS) and the Arecibo Legacy Fast ALFA Survey(ALFALFA) to establish the HI mass vs. stellar mass and halo mass scaling relations using an abundance matching method that is free of the Malmquist bias. To enable abundance matching, a cross-match between the SDSS DR7 galaxy group sample and the ALFALFA HI sources provides a catalog of 16520 HI-galaxy pairs within 14270 galaxy groups(halos). By applying the observational completeness reductions for both optical and HI observations, we used the remaining 8180 ALFALFA matched sources to construct the model constraints. Taking into account the dependence of HI mass on both the galaxy and group properties, we establish two sets of scaling relations: one with a combination of stellar mass,(g-r) color and halo mass, and the other with stellar mass,specific star-formation rate(sSFR), and halo mass. We demonstrate that our models can reproduce the HI mass component as both stellar mass and halo mass. Additional tests showed that the conditional HI mass distributions as a function of the cosmic web type and the satellite fractions were well recovered.

关键词： galaxy groups neutral hydrogen halos statistical