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Using choroidal thickness to detect myopic macular degeneration

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International journal of Ophthalmology(English edition) 2024年第2期17卷 317-323页

作者： Ran Liu Meng xuan De-cai Wang Ou xiao xin-xing Guo jian Zhang Wei Wang Monica jong Padmaja Sankaridurg Kyoko Ohno-Matsui Qiu-xia Yin Ming-Guang He Zhi-xi Li State Key Laboratory of Ophthalmology Zhongshan Ophthalmic CenterSun Yat-sen UniversityGuangdong Provincial Key Laboratory of Ophthalmology and Visual ScienceGuangdong Provincial Clinical Research Center for Ocular DiseasesGuangzhou 510060Guangdong ProvinceChina New England College of Optometry BostonMassachusetts 02115USA Wilmer Eye Institute Johns Hopkins UniversityBaltimoreMD 21231USA Brien Holden Vision Institute Sydney 2052Australia School of Optometry and Vision Science University of New South WalesSydney 2052Australia Department of Ophthalmology and Visual Science Tokyo Medical and Dental UniversityTokyo 113-8510Japan School of Optometry the Hong Kong Polytechnic UniversityHong Kong SARChina Research Centre for SHARP Vision the Hong Kong Polytechnic UniversityHong Kong SARChina Center for Eye and Vision Research(CEVR) 17W Hong Kong Science ParkHong Kong SARChina

AIM:To explore the usage of choroidal thickness measured by swept-source optical coherence tomography(SS-OCT)to detect myopic macular degeneration(MMD)in high myopic ***:Participants with bilateral high myopia(≤−6 diopters)were recruited from a subset of the Guangzhou Zhongshan Ophthalmic Center-Brien Holden Vision Institute High Myopia Cohort ***-OCT was performed to determine the choroidal thickness,and myopic maculopathy was graded by the International Meta-Analysis for Pathologic Myopia(META-PM)Classiﬁ*** of MMD was defined as META-PM category 2 or ***:A total of 568 right eyes were included for *** with MMD(n=106,18.7%)were found to have older age,longer axial lengths(AL),higher myopic spherical equivalents(SE),and reduced choroidal thickness in each Early Treatment Diabetic Retinopathy Study(ETDRS)grid sector(P<0.001).The area under the receiver operating characteristic(ROC)curves(AUC)for subfoveal choroidal thickness(0.907)was greater than that of the model,including age,AL,and SE at 0.6249,0.8208,and 0.8205,*** choroidal thickness of the inner and outer nasal sectors was the most accurate indicator of MMD(AUC of 0.928 and 0.923,respectively).An outer nasal sector choroidal thickness of less than 74μm demonstrated the highest odds of predicting MMD(OR=33.8).CONCLUSION:Choroidal thickness detects the presence of MMD with high agreement,particularly of the inner and outer nasal sectors of the posterior pole,which appears to be a biometric parameter more precise than age,AL,or SE.

关键词： high myopia choroidal thickness myopic macular degeneration swept-source optical coherence tomography

基于混合神经网络的多维视觉传感信号模式分类

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传感技术学报 2024年第6期37卷 1035-1040页

作者：陈威蔡奕侨华侨大学计算机科学与技术学院福建厦门361021

传感器采集的数字信号分类精度差,导致关键信息的丢失。为了提高传感数据的可靠性和有效性,提出基于混合神经网络的多维视觉传感信号模式分类方法。结合卷积神经网络(CNN)、循环神经网络(RNN)构建混合神经网络,以更有效地表示多维视觉... 详细信息

传感器采集的数字信号分类精度差,导致关键信息的丢失。为了提高传感数据的可靠性和有效性,提出基于混合神经网络的多维视觉传感信号模式分类方法。结合卷积神经网络(CNN)、循环神经网络(RNN)构建混合神经网络,以更有效地表示多维视觉数据中的特征;其中,卷积神经网络负责对多维的空间信号进行去噪处理并提取特征;循环神经网络负责对时域和频域信号进行特征提取;混合神经网络通过联合训练CNN和RNN各自的参数,以调整其权重,并且结合两者从不同层级提取的特征来实现多维视觉传感信号模式的分类。仿真结果表明,使用所提方法进行分类时,信号光滑度保持在0.9以上,传感信号分类结果与实际结果拟合度较高,有效实现多维视觉传感信号模式分类。

关键词：传感器信号处理信号模式分类混合神经网络视觉传感信号卷积神经网络循环神经网络贝塞尔曲线

轨道交通运营风险事件的事理图谱构建及演化分析

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中国安全生产科学技术 2024年第4期20卷 12-19页

作者：许慧蔡林重庆邮电大学经济管理学院重庆400065 重庆邮电大学理学院重庆400065

为厘清轨道交通运营风险中碎片化、口语化事件信息的演化逻辑,以轨道交通运营风险事件新闻中的部分内容作为数据源,抽取事件信息和事件关系,通过Neo4j构建轨道交通运营风险事件的事理图谱,进而利用Bert模型、层次聚类和莱文斯坦距离对... 详细信息

为厘清轨道交通运营风险中碎片化、口语化事件信息的演化逻辑,以轨道交通运营风险事件新闻中的部分内容作为数据源,抽取事件信息和事件关系,通过Neo4j构建轨道交通运营风险事件的事理图谱,进而利用Bert模型、层次聚类和莱文斯坦距离对风险事件进行泛化,并进一步梳理得出泛化事件的逻辑关系,由此得到轨道交通运营风险事件的演化路径和发展方向。研究结果表明:层次聚类方法中轮廓系数大于0.9,本文方法具有可行性。研究结果可为轨道交通运营风险防范及应急决策选择提供参考和支持。

关键词：轨道交通运营风险事件事理图谱 Bert模型层次聚类事件泛化

THEORETICAL STUDY OF GIANT MAGNETO-IMPEDANCE IN AMORPHOUS FILMS WITH LONGITUDINAL MAGNETIC ANISOTROPY

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Acta Metallurgica Sinica(English Letters) 2000年第4期13卷 995-1000页

作者： Yu, j.Q. Zhou, Y. cai, B.C. Zhao, x.L. Shanghai jiaotong Univ Shanghai China

Giant magneto-impedance (MI) effect in thin films with longitudinal magnetic anisotropy was studied theoretically. The effective permeability of films as a function of external magnetic field Ha, anisotropy field and other parameters of films was presented by Landau-Lifshitz-Gilbert theory. The theoretical results agree well with the experimental data, which shows a strong dependence of the impedance on the applied magnetic field.

关键词： Electric currents Magnetic anisotropy Magnetic fields Skin effect

Oxidized organic molecules in the tropical free troposphere over Amazonia

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National Science Review 2024年第1期11卷 174-184页

作者： Qiaozhi Zha Diego Aliaga Radovan Krejci Victoria A.Sinclair Cheng Wu Giancarlo Ciarelli Wiebke Scholz Liine Heikkinen Eva Partoll Yvette Gramlich Wei Huang Markus Leiminger joonas Enroth Otso Per?kyl? Runlong cai xuemeng Chen Alkuin Maximilian Koenig Fernando Velarde Isabel Moreno Tuukka Pet?j? Paulo Artaxo Paolo Laj Armin Hansel Samara Carbone Markku Kulmala Marcos Andrade Douglas Worsnop Claudia Mohr Federico Bianchi Institute for Atmospheric and Earth System Research/Physics University of Helsinki joint International Research Laboratory of Atmospheric and Earth System Sciences Nanjing University Department of Environmental Science & Bolin Centre for Climate Research Stockholm University Department of Chemistry and Molecular Biology University of Gothenburg Institute for Ion and Applied Physics University of Innsbruck Ionicon Analytik GmbH Laboratory for Atmospheric Physics Institute for Physics Research Universidad Mayor de San Andrés Institute of Physics University of Sao Paulo Institute for Geosciences and Environmental Research (IGE) University of Grenoble Alpes Agrarian Sciences Institute Federal University of Uberl?ndia Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology Department of Atmospheric and Oceanic Sciences University of Maryland Aerodyne Research Inc. Department of Environmental System Science ETH Zürich Switzerland and Laboratory of Atmospheric Chemistry Paul Scherrer Institute

New particle formation(NPF) in the tropical free troposphere(FT) is a globally important source of cloud condensation nuclei, affecting cloud properties and climate. Oxidized organic molecules(OOMs)produced from biogenic volatile organic compounds are believed to contribute to aerosol formation in the tropical FT, but without direct chemical observations. We performed in situ molecular-level OOMs measurements at the Bolivian station Chacaltaya at 5240 m above sea level, on the western edge of Amazonia. For the first time, we demonstrate the presence of OOMs, mainly with 4–5 carbon atoms, in both gas-phase and particle-phase(in terms of mass contribution) measurements in tropical FT air from Amazonia. These observations, combined with air mass history analyses, indicate that the observed OOMs are linked to isoprene emitted from the rainforests hundreds of kilometers away. Based on particle-phase measurements, we find that these compounds can contribute to NPF, at least the growth of newly formed nanoparticles, in the tropical FT on a continental scale. Thus, our study is a fundamental and significant step in understanding the aerosol formation process in the tropical FT.

关键词： oxidized organic molecules tropical aerosol formation Amazon free troposphere

Bulk nanocrystalline W-Ti alloys with exceptional mechanical properties and thermal stability

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journal of Materials Science & Technology 2022年第19期114卷 16-28页

作者： H.x.xue x.C.cai B.R.Sun x.Shen C.C.Du x.j.Wang T.T.Yang S.W.xin T.D.Shen Clean Nano Energy Center State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao 066004China CSSC 723rd Research Institute China State Shipbuilding Corporation LimitedYangzhou 225000China

Nanocrystalline(NC)W metals and alloys often exhibit higher radiation tolerance and strength than their coarse-grained ***,their thermal stability is low,making it difficult to achieve bulk NC W metals and alloys by consolidation using conventional techniques such as pressure-less sintering,hot-explosive-compaction sintering,and spark plasma *** we report the synthesis and mechanical properties of bulk NC W_(100-x)Ti_(x)(x=10 at.%-30 at.%)alloys prepared by consolidating mechanically alloyed NC powders under a high-temperature/high-pressure *** 20 at.%-30 at.%Ti largely improves the sinterability of NC W-Ti alloy *** room-temperature microhardness and compressive yield strength of consolidated bulk NC W_(80)Ti_(20) alloy are∼16.9 and 6.0 GPa,respectively,which are mainly caused by grain boundary strengthening and significantly higher than those of previously reported W and W *** ultimate compressive strength of bulk NC W_(80)Ti_(20) measured between 900 and 1100°C deceases with increasing *** behavior can be explained by the activation of Rachinger grain boundary *** grain growth is observed in bulk NC W_(80)Ti_(20) after compression at 1000°*** calculation suggests that it is the segregation of Ti at grain boundaries that decreases the specific grain boundary free energy and makes the NC W_(80)Ti_(20) alloy thermodynamically stable.

关键词： Nanocrystalline W-Ti alloys Segregation Grain boundary energy Strength Hardness

具有联盟和概率图结构合作对策的分配规则及其应用

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中国管理科学 2024年第1期32卷 137-145页

作者：单而芳史纪磊蔡蕾上海大学管理学院上海200444 江苏海洋大学商学院江苏连云港222005

van den Brink等^([24])考虑了具有联盟结构和图结构合作对策的分割-图值,该值虽然反映了联盟结构和图结构对分配结果的双重影响,但忽略了合作结构的不确定性。本文从图结构的不确定性出发,提出了具有联盟结构和概率图结构的合作对策模... 详细信息

van den Brink等^([24])考虑了具有联盟结构和图结构合作对策的分割-图值,该值虽然反映了联盟结构和图结构对分配结果的双重影响,但忽略了合作结构的不确定性。本文从图结构的不确定性出发,提出了具有联盟结构和概率图结构的合作对策模型,并引入了新的分配规则——分割-概率图值。证明了分割-概率图值是满足概率分割分支有效性和概率公平性的唯一解。最后,以跨国材料运输为例,将分割-概率图值和其他值做了比较分析。

关键词： TU-对策分配规则联盟结构概率图分割-概率图值

ON THE A/D TYPE TWIN BOUNDARY IN 18R MARTENSITE OF A Cu-Zn-Al ALLOY

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Acta Metallurgica Sinica(English Letters) 1997年第5期10卷 425-429页

作者： Zhang, j.x. Zheng, Y.F. cai, W. Zhao, L.C. Harbin Inst of Technology Harbin China

The A/D type twin boundary in a Cu-Zn-Al shape memory alloy appears curved under TEM and shows irregularly serrated steps under HREM. Crystallographic analysis shows that the macroscopic curve results from non-self-accommodation of the boundary, the deviation from exact twin orientation and a preferential orientation for lower boundary energy.

关键词： Aluminum alloys Copper alloys Crystallography Electron microscopy Martensite Zinc alloys

THE TYPE II DEFECT IN 18R MARTENSITE IN A Cu-Zn-Al ALLOY

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Acta Metallurgica Sinica(English Letters) 1998年第1期11卷 29-32页

作者： j.x.Zhang Y.F.Zheng W.cai L.C.Zhao Harbin Inst of Technology Harbin China

Type H defect in 18R martensite in a Cu-Zn-Al alloy has been studied by high resolution electron microscopy. It was found that Type H defect is not fault internal to martensite plate; rather,it is a stack of plates A and C. The rare observation of Type H defect is considered to be due to the fact that thc slice is too thin to exist for self-accommodation.

关键词： shape memory alloy Cu-based alloy defect