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Automated detection of myopic maculopathy from color fundus photographs using deep convolutional neural networks

Eye and Vision 2024年第4期10卷 11-22页

作者： Jun Li Lilong Wang Yan Gao Qianqian Liang Lingzhi Chen Xiaolei Sun Huaqiang Yang Zhongfang Zhao Lina Meng Shuyue Xue Qing Du zhichun Zhang Chuanfeng LV Haifeng Xu Zhen Guo Guotong Xie Lixin Xie Qingdao Eye Hospital of shandong First Medical University 5 Yanerdao RoadQingdao 266071China State Key Laboratory Cultivation Base Shandong Provincial Key Laboratory of OphthalmologyShandong Eye InstituteShandong First Medical University&Shandong Academy of Medical SciencesQingdao 266071China Ping An Healthcare Technology 9F Building BPingAn IFCNo.1-3 Xinyuan South RoadBejing 100027China shandong Eye Hospital of shandong First Medical University Jinan 250021China Rongcheng Eye Hospital Weihai 264200China Hospital of PLA Navy Qingdao 266071China Qilu Hospital of shandong University(Qingdao) Qingdao 266035China Ping An Healthcare and Technology company limited hanghai 200030China ping An International Smart City Technology company limited Shenzhen 518000China.

Background:Myopic maculopathy(MM)has become a major cause of visual impairment and blindness worldwide,especially in East Asian *** learning approaches such as deep convolutional neural networks(DCNN)have been successfully applied to identify some common retinal diseases and show great potential for the intelligent analysis of *** study aimed to build a reliable approach for automated detection of MM from retinal fundus images using DCNN ***:A dual-stream DCNN(DCNN-DS)model that perceives features from both original images and corresponding processed images by color histogram distribution optimization method was designed for classification of no MM,tessellated fundus(TF),and pathologic myopia(PM).A total of 36,515 gradable images from four hospitals were used for DCNN model development,and 14,986 gradable images from the other two hospitals for external *** also compared the performance of the DCNN-DS model and four ophthalmologists on 3000 randomly sampledfundus ***:The DCNN-DS model achieved sensitivities of 93.3%and 91.0%,specificities of 99.6%and 98.7%,areas under the receiver operating characteristic curves(AUCs)of 0.998 and 0.994 for detecting PM,whereas sensitivities of 98.8%and 92.8%,specificities of 95.6%and 94.1%,AUCs of 0.986 and 0.970 for detecting TF in two external testing *** the sampled testing dataset,the sensitivities of four ophthalmologists ranged from 88.3%to 95.8%and 81.1%to 89.1%,and the specificities ranged from 95.9%to 99.2%and 77.8%to 97.3%for detecting PM and TF,***,the DCNN-DS model achieved sensitivities of 90.8%and 97.9%and specificities of 99.1%and 94.0%for detecting PMand T,***:The proposed DCNN-DS approach demonstrated reliable performance with high sensitivity,specificity,and AUC to classify different MM levels on fundus photographs sourced from *** can help identify MM automatically among the large myopic groups and show great potenti

关键词： Myopic maculopathy Tessellated fundus Pathologic myopia Deep convolutional neural network Color fundus image

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Experimental Study on Gas Flow Uniformity in a Diesel Particulate Filter Carrier

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Fluid Dynamics & Materials Processing 2024年第1期20卷 193-204页

作者： Zhengyong Wang Jianhua Zhang Guoliang Su Peixing Yang Xiantao Fan Shuzhan Bai Ke Sun Guihua Wang School of Energy and Power Engineering Shandong UniversityJinan250061China State Key Laboratory of Engines Tianjin UniversityTianjin300072China Weichai Power Emission Solutions Technology company limited Weifang261043China China·shandong·YYO Emission Control System Co. Ltd.Liaocheng252100China

A Diesel Particulate Filter(DPF)is a critical device for diesel engine exhaust products *** using active-regeneration purification methods,on the one hand,a spatially irregular gas flow can produce relatively high local temperatures,potentially resulting in damage to the carrier;On the other hand,the internal temperature field can also undergo significant changes contributing to increase this *** study explores the gas flow uniformity in a DPF carrier and the related temperature behavior under drop-to-idle(DTI)condition by means of bench *** is shown that the considered silicon carbide carrier exhibits good flow uniformity,with a temperature deviation of no more than 2%with respect to the same radius measurement point at the outlet during the regeneration *** the DTI test,the temperature is relatively high within r/2 near the outlet end,where the maximum temperature peak occurs,and the maximum radial temperature gradient is located between r/2 and the *** these quantities grow as the soot load increases,thereby making the risk of carrier burnout ***,it is shown that the soot load limit of the silicon carbide DPF can be extended to 11 g/L,which reduces the frequency of active regeneration by approximately 40%compared to a cordierite DPF.

关键词： DPF flow uniformity DTI silicon carbide carrier soot load

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Paleoenvironment evolution and organic matter enrichment mechanisms in the first member of the Qingshankou Formation,Songliao Basin,China

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Frontiers of Earth Science 2024年第2期18卷 364-383页

作者： Ying LI Min WANG Yu YAN Xin WANG Jinyou ZHANG Xuefeng BAI Yuchen ZHANG Jiaheng XUE Junsheng FEI Lianbin ZHANG Guojun WANG School of Geoscience China University of Petroleum(East China)Qingdao 266580China shandong provincial Key Laboratory of Deep Oil and Gas Qingdao 266580China Exploration and Development Research Institute of Daqing Oilfield Co Ltd. Daqing 163712China Exploration Division PetroChina Daqing Oilfield CompanyDaqing 163453China Department of Physics Xiamen University MalaysiaBandar Sunsuria 43900Malaysia

Organic matter is the basis for oil and gas generation,and the depositional environment controls its *** first member of the Qingshankou Formation(K_(2)qn^(1))in Songliao Basin has a thick organic-rich shale and so is an important target section for shale oil exploration and *** the Gulong Sag,shale samples from this unit were collected over the full length of the *** characterization of the environments of deposition(EOD)of K_(2)qn^(1)was improved by utilizing lithological characteristics,thin section observations,elemental compositions,and organic carbon *** with the normalization coefficients proposed in this paper,an organic matter correlation model was established to elucidate the factors that influence organic matter *** the bottom to the top of K2qn1,the lake depth gradually becomes shallower,the primary productivity first decreases and then increases,the reducing conditions become stronger and then weaker,the water salinity gradually decreases,the climate first becomes semi-humid and then warm and humid,and the input of terrigenous debris first decreases and then increases.A major marine transgression at the base of the K_(2)qn^(1)᾽s brought in nutrients to increase primary productivity,and the density-stratified reducing environment preserved and enriched organic *** primary productivity occurred during the middle of the deposition of the K_(2)qn^(1),while terrigenous input is *** matter is preserved in reduced deep lake environments,resulting in organic matter-rich black *** lake became shallower,and the salinity decreased in the upper part of K_(2)qn^(1).Benthic organisms rapidly multiplied,consuming large amounts of oxygen and destroying the previously depositional environment,resulting in a reducing environment disturbed by benthic organisms with poor preservation conditions and the lowest organic matter content.

关键词： major and trace elements paleoenvironment evolution OM enrichment mechanism lacustrine shale Songliao Basin Qingshankou Formation

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Influence of shale reservoir properties on shale oil mobility and its mechanism

Energy Geoscience

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Energy Geoscience 2024年第4期5卷 212-223页

作者： Jijun Li Hang You Xinwen Zhang Suping Zhao Fujie Jiang Guoqi Feng Yue Su Yinwu Zhang Jiaheng Xue shandong provincial Key Laboratory of Deep Oil and Gas China University of Petroleum(East China)Qingdao266580China School of Geosciences China University of Petroleum(East China)Qingdao266580China Exploration&Development Research Institute of Henan Oilfield company Zhengzhou450000China PetroChina Research Institute of Petroleum Exploration&Development Beijing100083China State Key Laboratory of Petroleum Resources and Prospecting Beijing102249China College of Geoscience China University of Petroleum(Beijing)Beijing102249China Department of Physics Xiamen University MalaysiaBandar Sunsuria43900 SepangSelangorMalaysia

Given the tremendous potential for continental shale oil in China,many oilfields in the central and eastern parts of the country are involved in the exploration and development of shale oil *** engineering factors,shale oil mobility is the key to determining its commercial *** study explores the Hetaoyuan Formation in the Biyang Depression as an example to determine the influence of reservoir properties on the movable oil volume and its *** techniques were used,including displacement nuclear magnetic resonance(NMR),low-temperature nitrogen adsorption(LTNA),X-ray diffraction(XRD)bulk mineral analysis,and scanning electron microscopy(SEM),and the results suggest that large average pore diameter,high throat to pore ratio,single pore morphology,and small specific surface area can weaken the boundary layer effect and reduce the amount of adsorbed *** observations reveal that compared to the dissolution pores and intergranular pores in brittle minerals,the intercrystalline pores in terrigenous clastic clay minerals are more affected by ***,authigenic clay minerals notably block the intergranular pores in the interbedded *** minerals are identified as the main contributor to the specific surface area,with high clay mineral content enhancing the pore heterogeneity of the ***,positive shale oil mobility occurs in shale with a weak boundary layer effect,which is attributed to the high brittle mineral content,large average pore diameter,small specific surface area,single pore morphology,and reservoir homogeneity.

关键词： Biyang depression Hetaoyuan formation Shale oil Mobility Nuclear magnetic resonance

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The preparation and performance of visible-light-sensitized luminescent nanoparticles based on europium complex

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Chinese Chemical Letters 2014年第2期25卷 247-252页

作者： Fu-Min Xue Ming-Hui Liang Zhen-Hua Wang Ling-Yu Luan Fu-Wei Li Yan Cheng Guang-Sheng Shao shandong provincial Analysis and Test Center ShanDong Academy of Science National Center for Nanosicence and Technology China Banknote Ink company

Long-wavelength-sensitized luminescent materials are desired for bio-detection. In this paper, we prepared a new kind of luminescent europium nanoparticles by a co-precipitation-condensation method. The luminescent europium complex Eu（tta）*** （tta = thenoyltrifluoroacetonate; bpt = 2-（N,N- di-ethylanilin-4-yl）-4,6-bis（pyrazol-l-yl）-l,3,5-triazine） was used as the active material, being encapsulated in the nanoparticles formed from 1H, 1H, 2H, 2H-perfluorooctyltrimethoxysilane （PFOTS） and poly（styrene-co-methyl methacrylate） [P（ST-co-MMA）]. The prepared nanoparticles not only can be well dispersed in water but also were of high photostability. Importantly, the nanoparticles displayed maximal excitation wavelength at 425 nm as well as an extended excitation wavelength up to 480 nm and a quantum yield for Eu3＋ luminescence of 0.22 （λex= 425 nm, room temperature）.

关键词： Long-wavelength-sensitized luminescence Europium nanoparticles Co-precipitation-condensation Bio-detection

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Research progress on electrolyte key salts for sodium-ion batteries

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Progress in Natural Science:Materials International 2024年第2期34卷 263-273页

作者： weimin Zhao Miao Wang Haichen Lin Kangwoon Kim Rongkai He Shijie Feng Haodong Liu College of Chemical Engineering and Safety Binzhou University Center for Memory and Recording Research Building University of California San Diego STATE GRID Liaocheng Power Supply company

Sodium-ion batteries(SIBs) are considered potential successors to lithium-ion batteries in the fields of energy storage and low-speed vehicles, thanks to their advantages such as abundant raw material sources, high energy density, and a wide operational temperature range. However, several scientific and engineering challenges still require attention in the development of sodium-ion batteries. Electrolyte salts, as a key component of sodium-ion battery electrolytes, play a critical role in battery performance. This paper provides a brief overview of the research progress on different electrolyte salt systems in sodium-ion batteries. It discusses characteristics such as ionic conductivity, electrochemical windows, electrochemical performance, and thermal safety in various solvent systems. Furthermore, the paper summarizes a series of strategies for controlling electrolyte and electrode interfaces, offering references for addressing the challenges in the mass production and application of sodium-ion batteries.

关键词： Electrochemical performance Electrolyte Electrolyte salts Sodium ion batteries

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Geology and mineralization of the Sanshandao supergiant gold deposit(1200 t)in the Jiaodong Peninsula,China:A review

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China Geology 2021年第4期4卷 686-719页

作者： Ming-chun Song Zheng-jiang Ding Jun-jin Zhang Ying-xin Song Jun-wei Bo Yu-qun Wang Hong-bo Liu Shi-yong Li Jie Li Rui-xiang Li in Wang Xiang-dong Liu Liang-liang Zhang Lei-lei Dong Jian Li Chun-yan He shandong provincial No.6 Exploration Institute of Geology and Mineral Resources Weihai 264209China shandong provincial Bureau of Geology and Mineral Resources Jinan 250013China shandong provincial No.3 Exploration Institute of Geology and Mineral Resources Yantai 264003China shandong Institute of Geological Sciences Jinan 250013China shandong provincial ruihai mining limited company Laizhou 261400China shandong Institute of Geophysical&Geochemical Exploration Jinan 250013China Hebei Key Laboratory of Strategic Critical Mineral Resources Hebei GEO UniversityShijiazhuang 050031China School of Civil and Resource Engineering University of Science and Technology BeijingBeijing 100083China School of Resources and Environmental Engineering Shandong University of TechnologyZibo 255000China

The Jiaodong Peninsula in shandong Province,China is the world’s third-largest gold metallogenic area,with cumulative proven gold resources exceeding 5000 *** the past few years,breakthroughs have been made in deep prospecting at a depth of 500‒2000 m,particularly in the Sanshandao area where a huge deep gold orebody was *** on previous studies and the latest prospecting progress achieved by the project team of this study,the following results are summarized.(1)3D geological modeling results based on deep drilling core data reveal that the Sanshandao gold orefield,which was previously considered to consist of several independent deposits,is a supergiant deposit with gold resources of more than 1200 t(including 470 t under the sea area).The length of the major orebody is nearly 8 km,with a greatest depth of 2312 m below sea level and a maximum length of more than 3 km along their dip direction.(2)Thick gold orebodies in the Sanshandao gold deposit mainly occur in the specific sections of the ore-controlling fault where the fault plane changes from steeply to gently inclined,forming a stepped metallogenic model from shallow to deep *** reason for this strong structural control on mineralization forms is that when ore-forming fluids migrated along faults,the pressure of fluids greatly fluctuated in fault sections where the fault dip angle *** the solubility of gold in the ore-forming fluid is sensitive to fluid pressure,these sections along the fault plane serve as the target areas for deep prospecting.(3)Thermal uplifting-extensional structures provide thermodynamic conditions,migration pathways,and deposition spaces for gold ***,the changes in mantle properties induced the transformation of the geochemical properties of the lower crust and magmatic *** further led to the reactivation of ore-forming elements,which provided rich materials for gold mineralization.(4)It can be concluded from previous research re

关键词： Gold deposit Deep prospecting Thermal uplifting-extension mineralization Transformation of mantle properties Stepped metallogenic model Mineral exploration engineering Jiaodong-type gold deposits Sanshandao Jiaodong Peninsula China

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Petroleum in the Jurassic Reservoirs within the Eastern Fukang Sub-depression,Junggar Basin,NW China:Correlation and Source Rock

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Acta Geologica Sinica(English Edition) 2023年第3期97卷 777-795页

作者： CHENG Bin LIU Hua ZHANG Kuihua REN Xincheng MENG Xiangyu LIU Dezhi shandong provincial Key Laboratory of Deep Oil and Gas China University of Petroleum(East China)QingdaoShandong 266580China shandong provincial Key Laboratory of Reservoir Geology China University of Petroleum(East China)QingdaoShandong 266580China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdaoShandong 266071China Sinopec Shengli Oilfield company DongyingShandong 257000China

The origin and source of the petroleum in the Jurassic reservoirs within the eastern Fukang sub-depression were geochemically *** show thermal maturities matching the peak generation stage,while the condensates are at the early stage of intense *** and condensates may have experienced mild evaporative fractionation,while mixing of severely biodegraded with non-biodegraded oils has *** biomarkers and isotopes,petroleums were classified into GroupⅠ,ⅡandⅢgenetic groups,with GroupⅢfurther divided intoⅢa andⅢb ***Ⅰpetroleum displays heavy carbon isotopes,a strong predominance of pristine over phytane,high C_(19)and C_(20)tricyclic and C_(24)tetracyclic terpanes,low gammacerane,and dominant C_(29)steranes,while GroupⅡshows light carbon isotopes,a predominance of phytane over pristine,high C_(21)and C_(23)tricyclic with low C_(24)tetracyclic terpanes,high gammacerane and dominant C_(27)***Ⅲa petroleum shows mixing compositions of GroupⅠandⅡ,while GroupⅢb displays similar compositions to Group I,but with significantly higher Ts,C_(29)Ts and C_(30)diahopane ***-source rock correlation suggests GroupⅠandⅡpetroleums originate from Jurassic and Permian source rocks,respectively,while GroupⅢa are mixtures sourced from these rocks andⅢb are mixtures from Jurassic and Triassic source rocks.

关键词： biomarkers oil-source rock correlation Jurassic reservoirs Fukang sub-depression Junggar Basin

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Effects of P addition on the microstructure and mechanical properties of Mg–5%Sn–1.25%Si alloy

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International Journal of Minerals,Metallurgy and Materials 2014年第3期21卷 289-294页

作者： Hao-ran Geng Qing-lei Wang Peng Liu Ming Wu School of Material Science and Engineering University of Jinan shandong provincial Key Laboratory of Preparation and Measurement of Building Materials University of Jinan Jinan Jinzhong Electronic Scale company Ltd.

The effects of Al-P addition on the microstructure and mechanical properties of as-cast Mg–5%Sn–1.25%Si magnesium alloy were investigated. The results show that the phases of the as-cast alloy are composed of α-Mg, Mg2 Sn, Mg2 Si, little P, and AlP. The Chinese character shape Mg2 Si phase changes into a granular morphology by P addition because AlP can act as a heterogeneous nucleation core for the Mg2 Si phase. When 0.225wt% of Al–3.5%P alloy is added, the mechanical properties of the Mg–5%Sn–1.25%Si alloy are greatly improved, and the tensile strength increases from 156 to 191 MPa, an increase of 22.4% compared to the alloy without P addition. When the amount of Al–3.5%P reaches 0.300wt%, a segregation phenomenon occurs in the granular Mg2 Si phase, and the tensile strength and hardness decrease though the elongation increases.

关键词： magnesium alloys microstructure mechanical properties phosphorus

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Influence of the Inverse-Time Protection Relays on the Voltage Dip Index

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Journal of Shanghai Jiaotong university(Science) 2014年第3期19卷 354-360页

作者：高新科刘玡朋 School of Electronic Information and Electrical Engineering Shanghai Jiaotong University Institute of Information Technology Luoyang Normal College Qingdao Power Supply company in shandong provincial Electric Power company

The probability-assessment analyses on the characteristic value of voltage dip by using Monte Carlo stochastic modeling method to stimulate the randomness of the short circuit fault are introduced. Using Matlab and Power Systems CAD(PSCAD), we design control interface which combines the electromagnetic transient simulation with the Monte Carlo method. Specifically, the designing of interface which is meant to employ the method of Matlab programming to control the electromagnetic transients including direct current(EMTDC)simulation is introduced. Furthermore, the influences of the protection devices on the voltage dip to ensure the authenticity and the referential reliability are simulated. A system with the inverse-time protection devices equipped on each line which can coordinate together is designed to cut off the short-circuit fault. The voltage dip of the designed system is assessed by the pre- and post-system average root mean square(RMS) variation frequency index, and the voltage dip index is compared with the Information Technology Industry Council(ITIC)curves. The simulation results demonstrate that the inverse-time relay protection equipments are well-coordinated,and the severity and the range of the voltage dip are influenced by the cooperation of the equipped inverse-time protection devices.

关键词： power quality voltage dip inverse-time protection relay Monte Carlo algorithm simulation

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