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RTDS在基于IEC 61850标准的保护闭环测试中的应用 被引量:5
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作者 Y.Chen D.S.Ouellette 曹天植 《华北电力技术》 CAS 2015年第10期31-39,共9页
RTDS电力系统实时仿真器是一种实时全数字电力系统电磁暂态仿真模拟装置,也是研究和分析电力系统特征、对继电保护进行闭环测试的重要检验工具,在国内外都已得到广泛的应用。目前,基于IEC61850的智能变电站设备在电力系统中应用日趋广泛... RTDS电力系统实时仿真器是一种实时全数字电力系统电磁暂态仿真模拟装置,也是研究和分析电力系统特征、对继电保护进行闭环测试的重要检验工具,在国内外都已得到广泛的应用。目前,基于IEC61850的智能变电站设备在电力系统中应用日趋广泛,RTDS适应技术发展的需要,由RTDS-GTNET网络协议卡提供RTDS与数字化变电站设备的模拟量和数字量通信功能,并于2013年开发了GOOSE-V5以及面对中国市场的Chinese SV模型,实现了用RTDS系统直接对国内基于IEC 61850的数字化保护和二次设备的闭环测试。主要介绍了RTDS-GTNET板卡及其配置方法,为使用RTDS进行数字化变电站继电保护设备研究的各科研单位提供基本的实践配置及使用方法。 展开更多
关键词 RTDS 实时仿真 IEC 61850 SV GOOSE 映射 闭环测试
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DS/SIMULIA SLM企业级仿真生命周期管理解决方案 被引量:1
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作者 张雁纪 《航空制造技术》 2011年第18期106-107,共2页
CAE仿真分析在帮助企业缩短产品设计周期,降低产品设计成本方面起到了重要的作用.仿真分析应用的增多也随之产生了大量的仿真数据,这些数据涉及了产品性能的方方面面,如何利用现有的仿真工具对设计模型进行简化并执行正确的仿真分析是... CAE仿真分析在帮助企业缩短产品设计周期,降低产品设计成本方面起到了重要的作用.仿真分析应用的增多也随之产生了大量的仿真数据,这些数据涉及了产品性能的方方面面,如何利用现有的仿真工具对设计模型进行简化并执行正确的仿真分析是一个相对复杂的流程,涉及了大量的模型标定与改进,是产品研发和改进的主要依据手段,是企业主要的智力资产,因此有必要采用仿真数据与流程管理系统对CAE分析流程进行有效管理,以实现企业智力资产的重用与推广. 展开更多
关键词 SLM DS/SIMULIA SLM 仿真数据 生命周期 企业 企业管理
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A Short Report on Decompression Sickness Incidents in Andaman and Nicobar Islands
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作者 Sheeba Ahmed Avijit Roy 《Journal of Biosciences and Medicines》 2016年第1期101-106,共6页
Objectives: Due to presence of extensively fascinating coral reef ecosystem in the continental shelf of Andaman and Nicobar Islands, people from all over the world visit these islands of India to indulge in recreation... Objectives: Due to presence of extensively fascinating coral reef ecosystem in the continental shelf of Andaman and Nicobar Islands, people from all over the world visit these islands of India to indulge in recreational diving. An increased participation figure has also elevated the number of divers at risk for Decompression Sickness (DCS). Despite this, no scientific data are available on DCS incidents from India. Present study is aimed to evaluate the DCS incidents reported in these islands, treatment provided, and the outcome of the treatment. An attempt has also been made to calculate the approximate frequency of DCS in comparison to the participation figure. Methods: Study design is retrospective data analyses of a recompression chamber. Naval Diving Unit Port Blair has the only active decompression chamber available in the islands, and Govind Ballabh Pant Hospital Port Blair was used to collect information on DCS incidents that occurred during the mentioned period. Due to lack of authenticated generalized documents of divers’ health history and dive logs, the scanty information was gathered from the dive centres on the basis of personal interviews/communications among the SCUBA diving instructors. Results: A total of nine cases were reported during the span of last four and half years, and thus approximate frequency of DCS in Andamans was 0.2/10000 divers year. All of the patients recovered completely after receiving the Hyperbaric Oxygen Therapy (HBOT), with no residual symptoms. Conclusions: Incident rate of DCS in Andamans is lower than that in many other parts of the world;possible reason could be under-reporting of less severe DCS cases. During the study period, the number of DCS type II incidents presented for the treatment was higher than that of DCS type I incidents. HBOT proved a complete success in treating DCS cases in the island. 展开更多
关键词 Decompression Sickness SCUBA Diving Andaman and Nicobar Islands INDIA
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英国DS Smith两项包装技术方案获得2018年Scanstar包装奖
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作者 DS Smith(消息) 《中华纸业》 CAS 2018年第18期71-71,共1页
欧洲第二大瓦楞纸箱生产商DS Smit h包装技术方案获得了2018年北欧Scanstar包装奖。最佳包装奖共有八项技术奖项,其中DS Smith占得两项,其中一项是为芬兰Refresco公司设计的,另一个是为瑞典企业设计的包装方案。为Refresco公司设计的Tet... 欧洲第二大瓦楞纸箱生产商DS Smit h包装技术方案获得了2018年北欧Scanstar包装奖。最佳包装奖共有八项技术奖项,其中DS Smith占得两项,其中一项是为芬兰Refresco公司设计的,另一个是为瑞典企业设计的包装方案。为Refresco公司设计的TetraPak饮料运输包装,易于进行人工包装,全部使用再生纤维原料生产。包装设计参考了货运托盘,便于零售仓储,运输过程中,包装可以与托盘系在一起,运输中不易摇晃,减少了损坏。为瑞典公司设计的包装方案主要用于电商行业,适合根据不同电商的需要进行印刷,还可以作为礼品包装。 展开更多
关键词 包装技术 SMITH DS sco公司 企业设计 英国 运输包装 瓦楞纸箱
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DS SolidWorks在汽车行业的分析应用
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作者 孙靖国 《CAD/CAM与制造业信息化》 2010年第2期10-12,共3页
一、前言 受全球性的金融危机影响,过去一年,世界汽车工业正面临着严峻的考验,北美的汽车巨头通用和克莱斯勒破产,福特一度走向破产的边缘,而亚洲汽车业老大丰田汽车出现71年来的首次亏损,全球汽车行业正面临着前所未有的剧烈震荡。
关键词 SOLIDWORKS 汽车行业 分析应用 DS 金融危机 汽车工业 克莱斯勒 丰田汽车
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DS Smith在英国伯明翰启动最新的全球研发中心
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作者 《中华纸业》 CAS 2023年第22期24-24,共1页
本刊讯(DS Smith消息)2023年10月,英国包装纸企DS Smith宣布启动全球研发和创新中心——R8,公司表示,这一新的研发中心开创了行业先河,使用创新模式帮助公司、客户和合作伙伴加快研发全新的包装解决方案。R8位于英国伯明翰附近,包括一个... 本刊讯(DS Smith消息)2023年10月,英国包装纸企DS Smith宣布启动全球研发和创新中心——R8,公司表示,这一新的研发中心开创了行业先河,使用创新模式帮助公司、客户和合作伙伴加快研发全新的包装解决方案。R8位于英国伯明翰附近,包括一个4000平方米的试验大厅、四个实验室、调节室、构思和设计工作室、原型制作区以及协作空间,它不仅是集团创新和研发团队的所在地,还旨在引领制造领域的创新研究,最大限度地满足对可持续包装日益增长的需求,以及实现可持续包装所需的创新技术。 展开更多
关键词 设计工作室 英国伯明翰 原型制作 可持续包装 创新模式 研发团队 包装纸 研发中心
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惠普Z800工作站——大规模流体特效渲染“猛禽” 5DS智作原创动画《Chuck Chuck》制作手记
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作者 李泉洲 《影视制作》 2011年第6期76-77,共2页
《Chuck Chuck》是由5DS智作-5Animation原创动画工作室创作的第一部原创动画短片。《Chuck Chuck》在创作过程中渲染占用了大量的工作,在没有专业工作站之前,
关键词 专业工作站 动画短片 原创 渲染 猛禽 流体 惠普 制作
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Longitudinal landscape of immune reconstitution after acute SARS-CoV-2 infection at single-cell resolution
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作者 Lili Ren Yiwei Liu +21 位作者 Yeming Wang Chao Wu Li Guo Lan Chen Xinming Wang Yan Xiao Lixue Huang Jingchuan Zhong Jiacheng Yao Lu Liu Hui Li Ying Wang Yongchao Ma Yichunzi Zhang Lin Di Tao Dong Julian Knight Jianbin Wang Yanyi Huang Bin Cao Xianwen Ren Jianwei Wang 《Science Bulletin》 2025年第3期323-327,共5页
The long-term consequences of severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)infection,known as the post-acute sequelae of COVID-19(PASC),have been a growing concern.A significant proportion of COVID-19 pa... The long-term consequences of severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)infection,known as the post-acute sequelae of COVID-19(PASC),have been a growing concern.A significant proportion of COVID-19 patients experience persistent health issues even six to twelve months after recovering from acute infection[1],[2],[3],[4].Therefore,understanding the immune reconstitution process and identifying the molecular and cellular mechanisms underlying PASC is crucial. 展开更多
关键词 LANDSCAPE consequences ACUTE
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Scalable metal-based nanoparticle synthesis via laser ablation in liquids for transformative sensory and synaptic devices
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作者 Jun-Gyu Choi Seokhyeon Baek +1 位作者 Junghoon Lee Sungjun Park 《International Journal of Extreme Manufacturing》 2025年第6期2-26,共25页
Artificial sensory systems(ASS)are pivotal to next-generation extended reality technologies,now evolving into flexible platforms for comfortable wear and immersive user experiences,while ensuring high performance and ... Artificial sensory systems(ASS)are pivotal to next-generation extended reality technologies,now evolving into flexible platforms for comfortable wear and immersive user experiences,while ensuring high performance and operational reliability.To address these demands,metal-based nanoparticles(NPs),such as noble metal,oxide,and multi-elemental NPs,have been extensively incorporated into functional materials of sensory and synaptic devices due to their tunable optical,electrical,and chemical properties,enhancing sensory precision,stability,and environmental adaptability.However,traditional NP fabrication methods often involve complex processing,residual contaminants,and scalability issues,limiting their effectiveness in ASS applications.State-of-the-art laser ablation in liquids(LAL)presents a promising alternative,offering scalable production of surfactant-free NPs with customizable physicochemical properties,though their application in electronics remains underexplored.This review delves into the transformative potential of LAL-fabricated NPs in ASS,covering the fundamental mechanisms of LAL,the role of process parameters,the derivative strategies for size modulation,the diversity of metal-based NPs,their applications in sensory and synaptic devices,and the challenges and perspectives for meeting industrial standards.Bridging the gap between LAL and ASS is poised to revolutionize both industrial manufacturing and academic research by offering scalable solutions to overcome intrinsic tradeoffs between flexibility and performance,fostering innovations in human-centric,immersive electronics. 展开更多
关键词 laser ablation in liquids nanoparticles artificial perceptual sensors synaptic devices
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4D Design and Simulation Technologies and Process Design Patterns to Support Lean Construction Methods 被引量:2
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作者 Manfred Breit Manfred Vogel +2 位作者 Fritz Hubi Fabian Mrki Micheal Raps 《Tsinghua Science and Technology》 SCIE EI CAS 2008年第S1期179-184,共6页
The objective of this ongoing joint research program is to determine how 3D/4D modeling, simulation and visualization of Products (buildings), Organizations and Processes (POP) can support lean construction. Initial f... The objective of this ongoing joint research program is to determine how 3D/4D modeling, simulation and visualization of Products (buildings), Organizations and Processes (POP) can support lean construction. Initial findings suggest that Process Design Pattern may have the potential to intuitively support ICT based lean construction. We initiated a 'Process Archeology' in order to reveal the requirements for tools that can support the planning, simulation and control of lean construction methods. First findings show that existing tools provide only limited support and therefore, we started to develop new methodologies and technologies to overcome these shortcomings. Through the introduction of Process Design Patterns, we intent to establish process thinking in the interdisciplinary POP design. Optimized construction processes may be synthesized with semi-automatic methods by applying Process Design Patterns on building structures. By providing process templates that integrate problem solution and expert knowledge, Process Design Patterns may have the potential to ensure high quality process models. 展开更多
关键词 4D design process and organization modeling and simulation process design patterns lean construction methods
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Design and Effectiveness of Coastal Protection Structures:Case Studies and Modelling Approaches
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作者 Leo C.van Rijn 《Journal of Environmental & Earth Sciences》 2025年第5期72-95,共24页
Beach groynes are structures for erosion protection along sandy coasts near inlets and can reduce the coastal erosion substantially,but open groynes cannot stop erosion completely because sand can be removed from the ... Beach groynes are structures for erosion protection along sandy coasts near inlets and can reduce the coastal erosion substantially,but open groynes cannot stop erosion completely because sand can be removed from the groyne compartments by cross-shore processes.Beach groynes should be designed with sufficient bypassing of sand to minimise erosion.Regular beach maintenance is required to keep a sufficient beach width for recreational purposes.The effectiveness of groyne compartments can be significantly improved by using T-head groynes or by using a submerged sill or breakwater in between the groynes.An economic evaluation shows that the beach maintenance costs over 50 years may be substantially higher than the construction costs of a submerged breakwater.An important parameter to be studied is the longshore transport,which requires detailed information of the wave climate,preferably based on measured data(offshore buoys)in combination with deep water wave modelling.Various models have been used to determine the net longshore sand transport and coastline changes.The design of groynes to reduce coastal erosion is illustrated by three field cases(Atlantic coast near Soulac,France;Lagos coast,Nigeria and Black Sea coast,Romania).These example cases show that beach groynes are effective structures,but sufficient bypassing of longshore sand transport is essential to minimise erosion.Regular beach fills in the groyne compartments may be required at high-energy(exposed)coasts.A submerged or emerged breakwater can be built between the groynes to protect the beach in the groyne compartments against erosion by cross-shore processes. 展开更多
关键词 Coastal Protection Structures Coastal Recession Coastal Erosion Modelling
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Design of Artificial Beaches at Sheltered and Exposed Sites
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作者 Leo van Rijn Arjan Mol Merel Kroeders 《Journal of Environmental & Earth Sciences》 2025年第1期588-610,共23页
The paper is focused on the design of artificial sand beaches at sheltered and exposed sites.The methodology applied includes the study of the most essential design parameters and the application of numerical models t... The paper is focused on the design of artificial sand beaches at sheltered and exposed sites.The methodology applied includes the study of the most essential design parameters and the application of numerical models to compute the beach erosion and maintenance.The computed erosion volume decreases for coarser sand(0.5 mm sand instead of 0.3 mm).Beach erosion increases for more graded sand,but the effect is small(10%–15%).The slope of the artificial beach at sheltered sites is commonly between 1 to 15 and 1 to 30 in conditions with a micro tidal range and mild waves.Slopes between 1 to 30 and 1 to 50 are used for more open exposed sites.The effect of the upper and lower beach slope(1 to 15 or 1 to 20)on beach erosion is marginal for sand in the range of 0.3 to 0.5 mm.A break in slope is quickly adjusted by transport processes.The volume of beach sand required may be reduced by constructing a submerged sill at the toe of the beach.Analysis of costs shows that the construction costs including maintenance over a period of 50 years of a submerged sill are about the same as that of beach fill including maintenance.Hence,the beach fill volume can be twice as large for a solution without a sill.Beach erosion due to alongshore transport processes is minimum if the beach line of the planform is perpendicular to the main wave direction(equilibrium beach). 展开更多
关键词 Design Artificial Beaches Submerged sills/breakwaters Beach Extensions and Land Reclamations
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A Hybrid Machine Learning and Blockchain Framework for IoT DDoS Mitigation
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作者 Singamaneni Krishnapriya Sukhvinder Singh 《Computer Modeling in Engineering & Sciences》 2025年第8期1849-1881,共33页
The explosive expansion of the Internet of Things(IoT)systems has increased the imperative to have strong and robust solutions to cyber Security,especially to curtail Distributed Denial of Service(DDoS)attacks,which c... The explosive expansion of the Internet of Things(IoT)systems has increased the imperative to have strong and robust solutions to cyber Security,especially to curtail Distributed Denial of Service(DDoS)attacks,which can cripple critical infrastructure.The proposed framework presented in the current paper is a new hybrid scheme that induces deep learning-based traffic classification and blockchain-enabledmitigation tomake intelligent,decentralized,and real-time DDoS countermeasures in an IoT network.The proposed model fuses the extracted deep features with statistical features and trains them by using traditional machine-learning algorithms,which makes them more accurate in detection than statistical features alone,based on the Convolutional Neural Network(CNN)architecture,which can extract deep features.A permissioned blockchain will be included to record the threat cases immutably and automatically execute mitigation measures through smart contracts to provide transparency and resilience.When tested on two test sets,BoT-IoT and IoT-23,the framework obtains a maximum F1-score at 97.5 percent and only a 1.8 percent false positive rate,which compares favorably to other solutions regarding effectiveness and the amount of time required to respond.Our findings support the feasibility of our method as an extensible and secure paradigm of nextgeneration IoT security,which has constrictive utility in mission-critical or resource-constrained settings.The work is a substantial milestone in autonomous and trustful mitigation against DDoS attacks through intelligent learning and decentralized enforcement. 展开更多
关键词 IoT security DDoS mitigation machine learning CNN random forest blockchain smart contracts cyberattack detection
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Multi-Scale Feature Fusion and Advanced Representation Learning for Multi Label Image Classification
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作者 Naikang Zhong Xiao Lin +1 位作者 Wen Du Jin Shi 《Computers, Materials & Continua》 2025年第3期5285-5306,共22页
Multi-label image classification is a challenging task due to the diverse sizes and complex backgrounds of objects in images.Obtaining class-specific precise representations at different scales is a key aspect of feat... Multi-label image classification is a challenging task due to the diverse sizes and complex backgrounds of objects in images.Obtaining class-specific precise representations at different scales is a key aspect of feature representation.However,existing methods often rely on the single-scale deep feature,neglecting shallow and deeper layer features,which poses challenges when predicting objects of varying scales within the same image.Although some studies have explored multi-scale features,they rarely address the flow of information between scales or efficiently obtain class-specific precise representations for features at different scales.To address these issues,we propose a two-stage,three-branch Transformer-based framework.The first stage incorporates multi-scale image feature extraction and hierarchical scale attention.This design enables the model to consider objects at various scales while enhancing the flow of information across different feature scales,improving the model’s generalization to diverse object scales.The second stage includes a global feature enhancement module and a region selection module.The global feature enhancement module strengthens interconnections between different image regions,mitigating the issue of incomplete represen-tations,while the region selection module models the cross-modal relationships between image features and labels.Together,these components enable the efficient acquisition of class-specific precise feature representations.Extensive experiments on public datasets,including COCO2014,VOC2007,and VOC2012,demonstrate the effectiveness of our proposed method.Our approach achieves consistent performance gains of 0.3%,0.4%,and 0.2%over state-of-the-art methods on the three datasets,respectively.These results validate the reliability and superiority of our approach for multi-label image classification. 展开更多
关键词 Image classification MULTI-LABEL multi scale attention mechanisms feature fusion
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TOWARDS CO_(2) NEUTRAL URBAN PLANNING:Presenting the Rotterdam Energy Approach and Planning(REAP) 被引量:3
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作者 Nico Tillie Andy Van Den Dobbelsteen +3 位作者 Duzan Doepel Marc Joubert Wim De Jager Dave Mayenburg 《Journal of Green Building》 2009年第3期103-112,共10页
By the year 2025 Rotterdam aims to have halved its CO_(2) emissions;an ambitious plan that will require a revolution-ary approach to urban areas.One proactive response to this challenge is an exploratory study of the ... By the year 2025 Rotterdam aims to have halved its CO_(2) emissions;an ambitious plan that will require a revolution-ary approach to urban areas.One proactive response to this challenge is an exploratory study of the Hart van Zuid area.An interdisciplinary team has investigated how to tackle CO_(2)-issues in a structured way.This has resulted in the Rotterdam Energy Approach and Planning(REAP)methodology.REAP supports initial demand for energy,propagates the use of waste streams and advocates use of renewable energy sources to satisfy the remaining demand.REAP can be applied at all levels:individual buildings,clusters of buildings and even whole neighbourhoods.Apply-ing REAP to the Hart van Zuid has shown that this existing area can become CO_(2) neutral.Best of all:REAP can be applied everywhere. 展开更多
关键词 EAP INDIVIDUAL satisfy
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The sooty moulds 被引量:11
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作者 Putarak Chomnunti Sinang Hongsanan +8 位作者 Begoña Aguirre-Hudson Qing Tian Derek Peršoh Manpreet K.Dhami Aisyah S.Alias Jianchu Xu Xingzhong Liu Marc Stadler Kevin D.Hyde 《Fungal Diversity》 SCIE 2014年第3期1-36,共36页
Sooty moulds are a remarkable,but poorly understood group of fungi.They coat fruits and leaves superficially with black mycelia,which reduces photosynthesis rates of host plants.Few researchers have,however,tried to q... Sooty moulds are a remarkable,but poorly understood group of fungi.They coat fruits and leaves superficially with black mycelia,which reduces photosynthesis rates of host plants.Few researchers have,however,tried to quantify their economic importance.Sooty moulds have been well-studied at the morphological level,but they are poorly represented in a natural classification based on phylogeny.Representatives are presently known in Antennulariellaceae,Capnodiaceae,Chaetothyriaceae,Coccodiniaceae,Euantennariaceae,Metacapnodiaceae and Trichomeriaceae and several miscellaneous genera.However,molecular data is available for only five families.Most sooty mould colonies comprise numerous species and thus it is hard to confirm relationships between genera or sexual and asexual states.Future studies need to obtain single spore isolates of species to test their phylogenetic affinities and linkages between morphs.Next generation sequencing has shown sooty mould colonies to contain many more fungal species than expected,but it is not clear which species are dominant or active in the communities.They are more common in tropical,subtropical and warm temperate regions and thus their prevalence in temperate regions is likely to increase with global warming.Sooty moulds are rarely parasitized by fungicolous taxa and these may have biocontrol potential.They apparently grow in extreme environments and may be xerophilic.This needs testing as xerophilic taxa may be of interest for industrial applications.Sooty moulds grow on sugars and appear to out-compete typical“weed”fungi and bacteria.They may produce antibiotics for this purpose and their biochemical potential for obtaining novel bioactive compounds for medical application is underexplored. 展开更多
关键词 ANTIBIOTICS CAPNODIALES CHAETOTHYRIALES Global warming Life cycle PHYLOGENY Xerophiles
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基于双重多视角表示的目标级隐性情感分类 被引量:2
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作者 崔蒙蒙 刘井平 +2 位作者 阮彤 宋雨秋 杜渂 《计算机工程》 CSCD 北大核心 2024年第1期79-90,共12页
目标级隐性情感分类是自然语言处理中一项重要的情感分析任务。目前多数研究主要侧重于对上下文感知的目标进行建模,且建模信息源较为单一,难以充分捕获到目标词在文本中的隐性情感。针对该问题,提出基于双重多视角表示学习的目标级隐... 目标级隐性情感分类是自然语言处理中一项重要的情感分析任务。目前多数研究主要侧重于对上下文感知的目标进行建模,且建模信息源较为单一,难以充分捕获到目标词在文本中的隐性情感。针对该问题,提出基于双重多视角表示学习的目标级隐性情感分类方法,采用3种视角对目标和输入文本进行建模,分别设计文本自身的表示学习、图视角下的表示学习以及外部知识视角下的表示学习,并通过卷积神经网络将3种视角下的表示进行深度融合。此外,同时采用上述3种视角对目标进行表示学习,将文本的语义表示和目标的语义表示相结合,并输入到情感极性分类器中。在5个公共数据集上进行实验并与8个基线模型的对比结果表明,该方法性能达到了最优水平,在News MTSC-mt和News MTSC-rw隐性情感分析数据集上的F1_m值分别比最好模型提高1.0%和2.6%,在Laptop14、Restaurant14和Twitter显性情感分析数据集上的F1_m值分别比最好模型提高3.6%、1.4%和1.6%。 展开更多
关键词 目标级隐性情感分类 自然语言处理 情感分析 双重多视角 表示学习
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面向远程监督命名实体识别的噪声检测 被引量:1
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作者 王嘉诚 王凯 +4 位作者 王昊奋 杜渂 何之栋 阮彤 刘井平 《计算机研究与发展》 EI CSCD 北大核心 2024年第4期916-928,共13页
针对远程监督命名实体识别(named entity recognition,NER)任务,目前有许多基于强化学习的方法,利用强化学习的强大决策能力,对远程监督生成的自动标注数据进行噪声过滤.然而,这些方法所使用的策略网络模型架构都较简单,识别噪声能力较... 针对远程监督命名实体识别(named entity recognition,NER)任务,目前有许多基于强化学习的方法,利用强化学习的强大决策能力,对远程监督生成的自动标注数据进行噪声过滤.然而,这些方法所使用的策略网络模型架构都较简单,识别噪声能力较弱,且都以完整的句子样本为单位进行识别,导致句子中的部分正确信息被丢弃.为解决上述问题,提出了一种新的基于强化学习的方法,称为RLTL-DSNER,该方法可以从远程监督生成的带噪数据中,以单词级别识别正确实例,减少噪声实例对远程监督NER的负面影响.具体来说,在策略网络模型中引入了标签置信函数来准确识别实例.此外,提出了一种新颖的NER模型预训练策略,使其能为强化学习的初始训练提供精准的状态表示和有效的奖励值,引导其向正确的方向更新.在4个数据集上的实验结果验证了RLTL-DSNER方法的优越性,在NEWS数据集上,相较于现有最先进的方法,获得了4.28%的F1提升. 展开更多
关键词 命名实体识别 远程监督 深度强化学习 噪声检测 预训练策略
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Lateral femoral neck stress fractures: A case report
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作者 Christiaan AJ Oudmaijer Nuno R Paulino Pereira +3 位作者 David Visser Alexander M Wakker Wout S Veltman Robbart van Linschoten 《World Journal of Orthopedics》 2024年第9期891-901,共11页
BACKGROUND Sport-induced injuries particularly affect young,healthy,and active individuals.Running,a popular and accessible sport,can cause a wide range of injuries,including stress fractures.Stress fractures can occu... BACKGROUND Sport-induced injuries particularly affect young,healthy,and active individuals.Running,a popular and accessible sport,can cause a wide range of injuries,including stress fractures.Stress fractures can occur during high-intensity training or competitions,especially among well-trained amateurs and professional athletes.Adequate diagnosis can be complicated by the typically young age,unremarkable medical history,and vital condition of the patient.Stress fractures present insidiously,and this is specifically the case with stress fractures of the femoral neck.Timely intervention is crucial to prevent progressive displacement,as this can damage the blood supply to the femoral head.CASE SUMMARY A 30-year-old male runner presented to our outpatient clinic with persistent pain 3 weeks after running a marathon.X-ray showed a complete lateral fracture of the left femoral neck,which was treated surgically with a dynamic hip screw.CONCLUSION It is essential for healthcare providers to be vigilant for the subtle symptoms of stress fractures to ensure timely treatment.Early recognition prevents com-plication and leads to a better prognosis. 展开更多
关键词 Stress fractures ATYPICAL Femoral Neck MARATHON DIAGNOSIS Case report
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