检索结果-南通市图书馆

The influence of corneal ablation patterns on prediction error after cataract surgery in post-myopic-LASIK eyes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Eye and Vision 2024年第4期10卷 23-31页

作者： Yunqian Yao jing Zhao Jifeng Yu Wenwen He ling Wei Xingtao zhou Yi Lu Xiangjia Zhu Eye Institute and Department of Ophthalmology Eye&ENT HospitalFudan University83 Fenyang RoadShanghai 200031China National Health Center Key Laboratory of Myopia(Fudan University) Key Laboratory of MyopiaChinese Academy of Medical SciencesShanghaiChina Shanghai Key Laboratory of Visual Impairment and Restoration ShanghaiChina Shanghai Research Center of Ophthalmology and Optometry ShanghaiChina Department of Ophthalmology Beijing Children's HospitalNational Center for Children's HealthCapital Medical UniversityBeijingChina State Key Laboratory of Medical Neurobiology Fudan UniversityShanghaiChina

Purpose:To evaluate the influence of corneal ablation patterns on the prediction error after cataract surgery in postmyopic-LASIK ***:Eighty-three post-myopic-LASIK eyes of 83 patients that underwent uneventful cataract surgery were retrospectively *** postoperative spherical equivalence(SE)was calculated for the implanted lens using the Haigis-L and Barrett True-K *** error at one month postsurgery was calculated as actual SE minus predicted *** each eye,area and decentration of the ablation zone was measured using the tangential curvature *** associations between prediction errors and corneal ablation patterns were ***:The mean prediction error was-0.83±1.00 D with the Haigis-L formula and-1.00±0.99 D with the Barrett True-K *** error was positively correlated with keratometry(K)value and negatively correlated with ablation zone area using either formula,and negatively correlated with decentration of the ablation zone using the Barrett True-K formula(all P<0.05).In the K<37.08 D group,prediction error was negatively correlated with decentration of the ablation zone with both formulas(all P<0.05).Multivariate analysis showed that with the Haigis-L formula,prediction error was associated with axial length(AL),K value and decentration,and with the Barrett True-K formula,prediction error was associated with AL and decentration(all P<0.05).Conclusion:A flatter cornea,larger corneal ablation zone and greater decentration will lead to more myopic prediction error after cataract surgery in post-myopic-LASIK eyes.

关键词： Cataract surgery Laser in situ keratomileusis Intraocular lens power Keratometry Ablation zone decentration Ablation zone size

上凸密度函数与Hausdorff测度──Sierpinski垫片

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中山大学学报（自然科学版） 2001年第1期40卷 112-113页

作者：何伟弘周作领中山大学数学与计算科学学院广东广州510275 中山大学岭南学院广东广州510275

主要讨论了Ｓｉｅｒｐｉｎｓｋｉ垫片的上凸密度函数在其端点处的计算问题，并通过具体的数值计算，得出了在端点处的上凸密度函数不等于１的结论．

关键词： SIEPINSKI垫片 HAUSDORFF测度上凸密度函数端点数值计算自相似集分形

Selenium,Type-2 Diabetes,and the Possible Protective Role of Vitamin D

在线全文

学校读者我要写书评

暂无评论

Biomedical and Environmental Sciences 2024年第6期37卷 661-665页

作者： Runxue Ma Ce Liu ling Zhang Jingzhe Guo Erkai zhou ling Zheng Li He Xiaobing Shan Yunhui Yu Bin Luo Institute of Occupational Health and Environmental Health School of Public HealthLanzhou UniversityLanzhou 730000GansuChina

Diabetes is a pervasive and serious global health *** to the International Diabetes Federation report,463 million adults worldwide were living with diabetes in 2019,and this number is projected to reach 700 million in... 详细信息

关键词： Diabetes Selenium Vitamin

An Improved UNet Lightweight Network for Semantic Segmentation of Weed Images in Corn Fields

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2024年第6期79卷 4413-4431页

作者： Yu zuo Wenwen Li School of Information and Control Engineering Jilin Institute of Chemical TechnologyJilin132022China School of Mechanical and Control Engineering Baicheng Normal UniversityBaicheng137000China

In cornfields,factors such as the similarity between corn seedlings and weeds and the blurring of plant edge details pose challenges to corn and weed *** addition,remote areas such as farmland are usually constrained by limited computational resources and limited collected ***,it becomes necessary to lighten the model to better adapt to complex cornfield scene,and make full use of the limited data *** this paper,we propose an improved image segmentation algorithm based on ***,the inverted residual structure is introduced into the contraction path to reduce the number of parameters in the training process and improve the feature extraction ability;secondly,the pyramid pooling module is introduced to enhance the network’s ability of acquiring contextual information as well as the ability of dealing with the small target loss problem;and lastly,Finally,to further enhance the segmentation capability of the model,the squeeze and excitation mechanism is introduced in the expansion *** used images of corn seedlings collected in the field and publicly available corn weed datasets to evaluate the improved *** improved model has a total parameter of 3.79 M and miou can achieve 87.9%.The fps on a single 3050 ti video card is about *** experimental results show that the network proposed in this paper can quickly segment corn weeds in a cornfield scenario with good segmentation accuracy.

关键词： Semantic segmentation deep learning UNet pyramid pooling module

Homologous heterostructure of MoS_(2) and MoO_(2) coupled with carbon layers as cathode catalyst for rechargeable lithium-oxygen batteries

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Rare Metals 2024年第7期43卷 3383-3390页

作者： Yi-Ming Zhang Zhao-Rui zhou Lan-ling Zhao Ye-Bing Li Rui-Feng Li Ya zhou Sana Shoukat Abulgasim-Ahmed-Abbaker Adam Jun Wang Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education) Shandong UniversityJinan 250061China Shenzhen Research Institute of Shandong University Shenzhen 518063China School of Physics Shandong UniversityShenzhen 518063China

Lithium-oxygen batteries tend to experience high overpotentials because of the sluggish oxygen reduction reaction and oxygen evolution reaction during cycling.A potential solution to address this issue is to develop a... 详细信息

关键词： lithium process. kinetics

Multi-circular formation control with reinforced transient profiles for nonholonomic vehicles:A path-following framework

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2024年第1期31卷 278-287页

作者： Jintao Zhang Xingling Shao Wendong Zhang Zongyu zuo School of Instrument and Electronics North University of ChinaTaiyuan 030051China State Key Laboratory of Dynamic Measurement Technology North University of ChinaTaiyuan 030051China Seventh Research Division School of Automation Science and Electrical EngineeringBeihang UniversityBeijing 100191China

This article investigates a multi-circular path-following formation control with reinforced transient profiles for nonholonomic vehicles connected by a digraph.A multi-circular formation controller endowed with the feature of spatial-temporal decoupling is devised for a group of vehicles guided by a virtual leader evolving along an implicit path,which allows for a circumnavigation on multiple circles with an anticipant angular *** addition,notice that it typically imposes a stringent time constraint on time-sensitive enclosing scenarios,hence an improved prescribed performance control(IPPC)using novel tighter behavior boundaries is presented to enhance transient capabilities with an ensured appointed-time convergence free from any *** significant merits are that coordinated circumnavigation along different circles can be realized via executing geometric and dynamic assignments independently with modified transient ***,all variables existing in the entire system are analyzed to be *** and experimental results are provided to validate the utility of suggested solution.

关键词： Multi-circular formation Reinforced transient profiles Nonholonomic vehicles Path following

A Dual-Task Learning Approach for Bearing Anomaly Detection and State Evaluation of Safe Region

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2024年第1期37卷 229-241页

作者： Yuhua Yin Zhiliang Liu Bin Guo Mingjian zuo School of Mechanical and Electrical Engineering University of Electronic Science and Technology of ChinaChengdu 611731China Qingdao International Academician Park Research Institute Qingdao 266041China

Predictive maintenance has emerged as an effective tool for curbing maintenance costs,yet prevailing research predominantly concentrates on the abnormal *** the ostensibly stable healthy phase,the reliance on anomaly detection to preempt equipment malfunctions faces the challenge of sudden anomaly *** address this challenge,this paper proposes a dual-task learning approach for bearing anomaly detection and state evaluation of safe *** proposed method transforms the execution of the two tasks into an optimization issue of the hypersphere *** leveraging the monotonicity and distinguishability pertinent to the tasks as the foundation for optimization,it reconstructs the SVDD model to ensure equilibrium in the model’s performance across the two *** experiments verify the proposed method’s effectiveness,which is interpreted from the perspectives of parameter adjustment and enveloping *** the meantime,experimental results also show two deficiencies in anomaly detection accuracy and state evaluation *** theoretical analysis inspires us to focus on feature extraction and data collection to achieve *** proposed method lays the foundation for realizing predictive maintenance in a healthy stage by improving condition awareness in safe regions.

关键词： Bearing condition monitoring Anomaly detection Safe region Support vector data description

Association between Mental Health Literacy and Workplace Well-Being of Chinese Grassroots Civil Servants:The Chain Mediating Effects of Regulatory Emotional Self-Efficacy and Resilience

在线全文

学校读者我要写书评

暂无评论

International Journal of Mental Health Promotion 2024年第7期26卷 559-568页

作者： Yi Tang Yajun Zhao Zihan Jin Shengnan Wu Zhijun Zhang Ju zhou ling zhou Chongqing Academy of Governance Chongqing400041China School of Education and Psychology Southwest Minzu UniversityChengdu610041China School of Educational Sciences Chongqing Normal UniversityChongqing401331China Department of Psychology and Behavioral Sciences Zhejiang UniversityHangzhou310030China Nanping Experimental Primary School Chongqing400060China

This study aimed to investigate the relationship between mental health literacy(MHL)and workplace well-being(WWB)of Chinese grassroots civil servants,with regulatory emotional self-efﬁcacy(RESE)and resilience as mediating variables.A questionnaire survey was conducted among Chinese grassroots civil servants,with a valid sample size of 2673 after excluding missing values and conducting relevant data *** PROCESS was used to examine the relationship between MHL,RESE,resilience,and *** study found that MHL among grassroots civil servants was positively and signiﬁcantly correlated with WWB(r=0.73,p<0.01).RESE partially mediated the relationship between MHL and WWB(β=0.25,95%CI[0.22,0.28]).Resilience partially mediated the relationship between MHL and WWB(β=0.22,95%CI[0.19,0.26]).MHL had a positive effect on WWB through the chain mediating effect of RESE and resilience(β=0.05,95%CI[0.03,0.07]).There is a close relationship between MHL and WWB,where Chinese grassroots civil servants with higher levels of MHL can develop stronger RESE and resilience,leading to higher *** results of this study remind organizational institutions of Chinese grassroots civil servants that enhancing MHL,RESE,and resilience is an important pathway to promoting their WWB.

关键词： Mental health literacy workplace well-being regulatory emotional self-efﬁcacy resilience Chinese grassroots civil servants

Design and application of copper/lithium composite anodes for advanced lithium metal batteries

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Rare Metals 2024年第3期43卷 942-970页

作者： Bin Zhang Ji-Ping Ma Yang Zhao Tong Li Jin-Lin Yang Zhan-ling Zhang Shi-Zhong Wei Guang-Min zhou School of Materials Science and Engineering Henan University of Science and TechnologyLuoyang 471003China Shenzhen Geim Graphene Center Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China School of Physical and Mathematical Sciences Nanyang Technological UniversitySingapore 637371Singapore Shenzhen Geim Graphene Center Tsinghua-Berkeley Shenzhen InstituteTsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China

Lithium(Li)is a promising candidate for nextgeneration battery anode due to its high theoretical specific capacity and low reduction ***,safety issues derived from the uncontrolled growth of Li dendrite and huge volume change of Li hinder its practical application.C onstructing dendrite-free composite Li anodes can significantly alleviate the above ***(Cu)-based materials have bee n widely used as substrates of the composite electrodes due to their chemical stability,excellent conductivity,and good mechanical ***/lithium(Cu/Li)composite anodes significantly regulate the local current density and decrease Li nucleation overp otential,realizing the uniform and dendrite-free Li *** this review,Cu/Li composite methods including electrodeposition,melting infusion,and mechanical rolling are systematically summarized and ***,design strategies of Cu-based current collectors for high performance Cu/Li composite anodes are *** challenges and future development for Cu/Li composite anodes are presented and *** hope that this review can provide a comprehensive understanding of Cu/Li composite methods of the latest development of Li metal anode and stimulate more research in the future.

关键词： Lithium metal batteries Cu/Li composite anode Electrodeposition Thermal melting infusion Mechanical rolling