检索结果-南通市图书馆

Quantitative analysis of optic disc changes in school-age children with ametropia based on artificial intelligence

International Journal of Ophthalmology(English edition) 2023年第11期16卷 1727-1733页

作者： Fang Liu Xing-Hui Yu Yu-Chuan Wang Miao Cao lian-feng xie Jing Liu Lin-Lin Liu The First Clinical Medical College of Gannan Medical University Ganzhou 341000Jiangxi ProvinceChina Department of Ophthalmology the First Affiliated Hospital of Gannan Medical UniversityGanzhou 341000Jiangxi ProvinceChina

AIM:To explore changes in the optic disc and peripapillary atrophy(PPA)in school-age children with ametropia using color fundus photography combined with artificial intelligence(AI)***:Based on the retrospective case-controlled study,226 eyes of 113 children aged aged 6–12y were enrolled from October 2021 to May *** to the results of spherical equivalent(SE),the children were divided into four groups:low myopia group(66 eyes),moderate myopia group(60 eyes),high myopia group(50 eyes)and emmetropia control group(50 eyes).All subjects underwent un-aided visual acuity,dilated pupil optometry,best-corrected visual acuity(BCVA),intraocular pressure,ocular axis measurement and color fundus ***:The width of PPA,horizontal diameter ratio of PPA to the optic disc and area ratio of PPA to the optic disc were significantly different among the four groups(P<0.05).The width of the nasal and temporal neuroretinal rim,the roundness of the optic disc,the height of PPA,the vertical diameter ratio of PPA to the optic disc,and the average density of PPA in the high myopia group were significantly different compared with the other three groups(P<0.05).There were strong negative correlations between SE and area ratio of PPA to the optic disc(r=-0.812,P<0.001)and strong positive correlation between axial length(AL)and area ratio of PPA to the optic disc(r=0.736,P<0.001).CONCLUSION:In school-age children with high myopia,the nasal and temporal neuroretinal rims are narrowed and even lost,which have high *** area ratio of the PPA to the optic disc could be used as an early predictor of myopia progression,which is of great significance for the development prevention and management of myopia.

关键词： optic disc artificial intelligence ametropia peripapillary atrophy spherical equivalent

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Kangfuxin solution alleviates esophageal stenosis after endoscopic submucosal dissection:A natural ingredient strategy

引用

World Journal of Gastroenterology 2025年第1期31卷 110-125页

作者： Xin Zhou Dan Ma Yi-Xiang He Jing Jin Hong-lian Wang Yun-feng Wang Fan Yang Jian-Qin Liu Jie Chen Zhi Li Department of Spleen and Stomach Diseases the Affiliated Traditional Chinese Medicine HospitalSouthwest Medical UniversityLuzhou 646000Sichuan ProvinceChina The Key Laboratory of Integrated Traditional Chinese and Western Medicine for Prevention and Treatment of Digestive System Diseases of Luzhou City The Affiliated Traditional Medicine HospitalSouthwest Medical UniversityLuzhou 646000Sichuan ProvinceChina Department of Gastroenterology Changhai HospitalNaval Medical UniversityShanghai 20082China Research Center of Integrated Chinese and Western Medicine The Affiliated Traditional Chinese Medicine HospitalSouthwest Medical UniversityLuzhou 646000Sichuan ProvinceChina School of Integrated Traditional Chinese and Western Clinical Medicine North Sichuan Medical CollegeNanchong637100Sichuan ProvinceChina

BACKGROUND Esophageal stricture ranks among the most significant complications following endoscopic submucosal dissection(ESD).Excessive fibrotic repair is a typical pathological feature leading to stenosis after *** To examine the effectiveness and underlying mechanism of Kangfuxin solution(KFX)in mitigating excessive fibrotic repair of the esophagus *** Pigs received KFX at 0.74 mL/kg/d for 21 days after esophageal full circumferential *** examinations occurred on days 7 and 21 *** vitro,recombinant transforming growth factor(TGF)-β1(5 ng/mL)induced a fibrotic microenvironment in primary esophageal fibroblasts(pEsF).After 24 hours of KFX treatment(at 1.5%,1%,and 0.5%),expression ofα-smooth muscle actin-2(ACTA2),fibronectin(FN),and type collagen I was *** signaling was analyzed,including TGF-β1,Smad2/3,and phosphor-smad2/3(p-Smad2/3).RESULTS Compared to the Control group,the groups treated with KFX and prednisolone exhibited reduced esophageal stenosis,lower weight loss rates,and improved food tolerance 21 d after *** treatment,Masson staining revealed thinner and less dense collagen fibers in the submucosal ***,the expression of fibrotic effector molecules was notably ***,KFX downregulated the transduction levels of fibrotic functional molecules such as TGF-β1,Smad2/3,and p-Smad2/*** vitro,pEsF exposed to TGF-β1-induced fibrotic microenvironment displayed increased fibrotic activity,which was reversed by KFX treatment,leading to reduced activation of ACTA2,FN,and collagen *** 1.5%KFX treatment group showed decreased expression of p-Smad 2/3 in TGF-β1-activated *** KFX showed promise as a therapeutic option for post-full circumferential esophageal ESD strictures,potentially by suppressing fibroblast fibrotic activity through modulation of the TGF-β1/Smads signaling pathway.

关键词： Kangfuxin solution Natural component Endoscopic submucosal dissection Esophagus stricture Fibrosis

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

A condition-based maintenance policy for reconfigurable multi-device systems

引用

Advances in Manufacturing 2024年第2期12卷 252-269页

作者： Shu-lian xie feng Xue Wei-Min Zhang Jia-Wei Zhu School of Mechanical Engineering Tongji UniversityShanghai201804People’s Republic of China

The exploration of component states for optimizing maintenance schedules in complex systems has garnered significant interest from ***,current literature usually overlooks the critical aspects of system flexibility and *** implementation of system reconfiguration can effectively mitigate system downtime and enhance production *** study proposes a dynamic condition-based maintenance policy considering reconfiguration for reconfigurable systems.A double-layer decision rule was constructed for the devices and *** achieve the best overall maintenance effect of the system,the remaining useful life probability distribution and recommended maintenance time of each device were used to optimize the concurrent maintenance time window of the devices and determine whether to reconfigure them.A comprehensive maintenance efficiency index was introduced that simultaneously considered the maintenance cost rate,reliability,and availability of the system to characterize the overall maintenance *** reconfiguration cost was included in the maintenance *** proposed policy was tested through numerical experiments and compared with different-level *** results show that the proposed policy can significantly reduce the downtime and maintenance costs and improve the overall system reliability and availability.

关键词： Condition-based maintenance(CBM) Reconfigurable system Remaining useful life Maintenance cost System reliability

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Crystalline porous materials:from zeolites to metal-organic frameworks(MOFs)

引用

Frontiers of Chemical Science and Engineering 2020年第2期14卷 123-126页

作者： Zaiku xie Bao-lian Su State Key Laboratory of Green Chemical Engineering and Industrial Catalysis Sinopec Shanghai Research Institute of Petrochemical TechnologyShanghai 201208China Laboratory of Inorganic Materials Chemistry(CMI) University of NamurNamurBelgium State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430074China

As a class of important crystalline porous materials,zeolites which were first found in 1756 have now been widely used in chemical industries for catalysis,adsorption and separation.35232 patents with the title including Hzeolite*n are documented by Derwent Innovations Index on January 2,2020[1].Despite of spread applications of zeolites and related-materials in industry,fundamental research of zeolites and their applications are still desired in both academia and industry,as shown in Fig.1.

关键词： porous zeolites zeolite

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Turbulence Statistics of Thermo-Buoyancy Supercritical Fuel Flow in a Regenerative Cooling Channel

引用

Journal of Thermal Science 2024年第1期33卷 126-137页

作者： SUN feng xie Gongnan School of Marine Science and Technology Northwestern Polytechnical UniversityXi'an 710072China Department of Thermal Engineering Tsinghua UniversityBeijing 100084China

Active regenerative cooling with supercritical hydrocarbon fuel is considered as the most promising thermal protection *** existence of buoyancy force would lead to strongly anisotropic flow and thermal transport *** is closely related to the cooling performance of the *** elucidate the mechanisms of turbulent transport,the large eddy simulation(LES) was performed to assess turbulence statistics within different turbulence *** results indicated that the buoyancy and inertial force together dominated the change of turbulent ***,the spatial thermal buoyancy effect significantly suppressed the vertical velocity *** is due to the laminar motion caused by the buoyancy force,thereby weakening the thermal *** the statistics of velocity fluctuation,it was found that the buoyancy force and inertial force greatly weaken the vertical and streamwise velocity fluctuation,*** the statistics of thermal transport,the results pointed out that the near-wall heat transport characteristics need to be paid more *** thickness of the temperature mixing boundary layer led to the attenuation of vertical heat flux,which inhibited vertical temperature diffusion and predisposed to extreme conditions of heat transfer *** results can enhance the academic understanding of the heat transfer mechanism of supercritical fluids,and give guidance for further applications of thermal protection.

关键词： active regenerative cooling large eddy simulation(LES) buoyancy force turbulence statistics

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A Non-Intrusive Reduced Basis EKI for Time Fractional Diffusion Inverse Problems

引用

Acta Mathematicae Applicatae Sinica 2020年第1期36卷 183-202页

作者： feng-lian YANG liang YAN College of Science Hohai UniversityNanjing 210098China School of Mathematics Southeast UniversityNanjing210096China

In this study,we consider an ensemble Kalman inversion(EKI)for the numerical solution of time fractional diffusion inverse problems(TFDIPs).Computational challenges in the EKI arise from the need for repeated evaluations of the forward *** address this challenge by introducing a non-intrusive reduced basis(RB)method for constructing surrogate models to reduce computational *** this method,a reduced basis is extracted from a set of full-order snapshots by the proper orthogonal decomposition(POD),and a doubly stochastic radial basis function(DSRBF)is used to learn the projection *** DSRBF is carried out in the offline stage with a stochastic leave-one-out cross-validation algorithm to select the shape parameter,and the outputs for new parameter values can be obtained rapidly during the online *** to the complete decoupling of the offline and online stages,the proposed non-intrusive RB method–referred to as POD-DSRBF–provides a powerful tool to accelerate the EKI approach for *** demonstrate the practical performance of the proposed strategies through two nonlinear time-fractional diffusion inverse *** numerical results indicate that the new algorithm can achieve significant computational gains without sacrificing accuracy.

关键词： fractional differential equations ensemble Kalman inversion surrogate modeling reduced basis method

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

煤体注水渗流模型构建及微观主控影响规律

引用

工程科学学报 2025年第2期47卷 271-281页

作者：王恩茂王刚解树亮魏宏钊冯净梁瀚丹山东科技大学安全与环境工程学院山东科技大学矿山灾害预防控制省部共建国家重点实验室培育基地

煤层注水技术是目前矿井除尘的主要技术手段之一，起到润湿煤体、源头减尘的作用.但随着开采深度的增加，煤体孔隙率相对较低，极大影响煤层注水的润湿效果.因此，为了提高煤层注水的效果，结合煤体固有属性、孔隙尺度等影响因素，首先... 详细信息

煤层注水技术是目前矿井除尘的主要技术手段之一，起到润湿煤体、源头减尘的作用.但随着开采深度的增加，煤体孔隙率相对较低，极大影响煤层注水的润湿效果.因此，为了提高煤层注水的效果，结合煤体固有属性、孔隙尺度等影响因素，首先，引入连通孔隙率，建立了包含孔喉、等效孔径、有效孔隙率、毛细管束、迂曲度、流动路径在内的渗流模型；其次，采用高精度射线显微镜（μ-CT）对内蒙古煤矿、同富新煤矿、梅花井煤矿、大黄山煤矿以及磁窖沟煤矿5个煤矿的不同变质程度煤进行扫描，三维重建可视化煤体微观有效孔隙结构，运用分形理论，提取煤体有效连通孔隙结构参数进行计算；再次，通过实验对5个煤矿不同变质程度的煤进行渗透率实测；最后，引入“敏感度”来表征每种影响因素对渗流量的影响程度，运用Morris筛选法，将数值分析法与渗流模型相耦合，定量筛选了煤体坚固性系数、迂曲度分形维数、有效孔隙率、体积分形维数、孔喉半径等主控因素，并分析了各主控因素对注水能力的影响规律.本研究建立了一个综合煤体坚固性系数、迂曲度分形维数、有效孔隙率、体积分形维数和孔喉半径的渗流模型.分析表明，影响注水能力的主控因素依次为煤体坚固性系数、迂曲度分形维数、有效孔隙率、体积分形维数和孔喉半径.注水能力与煤体坚固性系数呈正弦函数关系，随着有效孔隙率的增加，迂曲度分形维数和体积分形维数的减小，注水能力增强.研究结果可为进一步完善煤层注水渗流理论、增强煤层注水润湿效果，防治矿井粉尘灾害提供理论依据.

关键词：煤层注水有效连通孔隙渗流模型主控因素计算机断层扫描

来源：

维普期刊数据库

同方期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Investigation of flow characteristics in a rotor-stator cavity under crossflow using wall-modelled large-eddy simulation

引用

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2023年第6期24卷 473-496页

作者： Lei xie Qiang DU Guang LIU Zengyan lian Yaguang xie Yifu LUO Key Lab of Light-duty Gas-turbine Institute of Engineering ThermophysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Innovation Academy for Light-duty Gas Turbine Chinese Academy of SciencesBeijing 100190China

Rotor-stator cavities are frequently encountered in engineering applications such as gas turbine *** are usually subject to an external hot mainstream crossflow which in general is highly swirled under the effect of the nozzle guide *** avoid hot mainstream gas ingress,the cavity is usually purged by a stream of sealing *** interactions between the external crossflow,cavity flow,and sealing flow are complicated and involve all scales of turbulent unsteadiness and flow instability which are beyond the resolution of the Reynolds-average *** cope with such a complex issue,a wall-modeled large-eddy simulation(WMLES)approach is adopted in this *** the simulation,a 20°sector model is used and subjected to a uniform pre-swirled external crossflow and a stream of radial sealing *** is triggered by a convergent Reynoldsaveraged Navier-Stokes(RANS)result in which the shear stress transport(SST)turbulent model is *** the WMLES simulation,the Smagoringsky sub-grid scale(SGS)model is applied.A scalar transportation equation is solved to simulate the blending and transportation process in the *** overall flow field characteristics and deviation between RANS and WMLES results are discussed *** RANS and WMLES results show a Batchelor flow mode,while distinct deviation is also *** in the small-radius region are caused by the insufficiency of the RANS approach in capturing the small-scale vortex structures in the boundary layer while deviations in the large-radius region are caused by the insufficiency of the RANS approach in predicting the external crossflow *** boundary layer vortex and external ingestion are then discussed in detail,highlighting the related flow ***,the large-flow structures induced by external flow ingress are analyzed using unsteady pressure oscillation signals.

关键词： Wall-modeled large-eddy simulation(WMLES) Rotor-stator cavity Flow instability Reynolds-averaged Navier-Stokes(RANS)

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Effect of Seasonality on Distribution of Macroalgae in a Stream System(Xin'an Spring) in Shanxi Province,North China

引用

Journal of Integrative Plant Biology 2006年第8期48卷 889-896页

作者： Bian-Fang Hu Shu-lian xie School of Life Science and Technology Shanxi University Taiyuan 030006 China

A survey of the seasonal distribution of macroalgae in a stream system in Shanxi Province, north China, was undertaken from July 2004 to April 2005. The relative abundance and percentage cover of macroalgae, and several environmental factors were monitored along a 20-m stretch at each of four sites, at intervals of approximately three months （one sampling per season）. Several stream conditions were relatively constant over the sampling period （pH, maximum width and maximum depth）, whereas others exhibited a distinct seasonal pattern （water temperature and specific conductance）, and some fluctuated with no discernable seasonal pattern （current velocity and dissolved oxygen）. Forty-two species of macroalgae were found, with a predominance of Chlorophyta （26 species, 61.9%）. Rhodophyts and Charophyta represented the smallest proportion （1 species each, 2.38%）. Six macroalgae species were the most widespread, occurring in all four sampling sites. Twelve species were found at only one site each. In terms of seasonality, eight species occurred throughout the year, whereas 16 species were found in only one season each. The macroalgal community at Xin＇an Spring was species rich relative to other streams. Species richness per sampling site was negatively correlated with pH. Principal component analysis revealed that no single variable had much influence on the macroalgal seasonal dynamics. We calculated Sorensen similarity indices to compare our study with other continent-wide surveys of stream macroalgae, but the similarity indices were all very low. This study also shows that macroalgae in different locations have significant reproductive isolation.

关键词： China distribution environmental factors seasonality stream macroalgae.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Derivation of a wave-state-dependent sea spray generation function and its application in estimating sea spray heat flux

引用

Science China Earth Sciences 2015年第10期58卷 1862-1871页

作者： LIU Bin GUAN ChangLong xie lian ZHAO Dongliang Physical Oceanography Laboratory Ocean University of China Department of Marine Earth and Atmospheric Sciences North Carolina State University

A sea spray generation function(SSGF)for bubble-derived droplets that takes into account the impact of wave state on whitecap coverage was presented in this *** combining the new SSGF with a previous wave-state-dependent SSGF for spume droplets,an SSGF applicable to both bubble-derived and spume droplets that includes the impacts of wave state was *** produced SSGF varies with surface wind as well as with wave *** sea surface wind increases,more sea spray droplets are produced,resulting in larger SSGFs and volume ***,under the same wind conditions,the SSGF is mediated by wave state,with larger SSGFs corresponding to older waves and larger windsea Reynolds *** impact of wave state on sea spray heat flux was then estimated by applying this SSGF while considering the thermodynamic feedback *** given atmospheric and oceanic conditions,the estimated sea spray heat flux increases with wind speed,wave age,and windsea Reynolds number.

关键词： wave state sea spray sea spray generation function air-sea heat flux

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：