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2714篇 您的检索式:作者名="DAVE"
    题名 作者 年代 出处 被引量
1基于深度学习卷积神经网络的地震波形自动分类与识别显示文摘发展高效、高精度、普适性强的自动波形拾取算法在地震大数据时代背景下显得越来越重要.波形自动拾取算法的主要挑战来自如何适应不同区域的不同类型地震事件的分类与筛选.本文针对地震事件-噪音分类这一问题,使用13839个汶川地震余震事件建立数据集,应用深度学习卷积神经网络(CNN)方法进行训练,并用8900个新的汶川余震事件作为检测数据集,其训练和检测准确率均达到95%以上.在对连续波形的检测中,CNN方法在精度和召回率上优于STA/LTA和Fbpicker传统方法,并能找出大量人工挑选极易遗漏的微震事件.最后,我们应用训练好的最优模型对选自全国台网的441个台站8天的连续波形数据进行了识别、到时挑取及与参考地震目录关联,CNN检出7016段波形,用自动挑选算法拾取到1380对P,S到时,并与540个地震目录事件成功关联,对1级以上事件总体识别准确率为54%,二级以上为80%,证明了CNN模型具有泛化能力,初步展示了CNN在发展兼具效率、精度、普适性算法,实时地震监测等应用上具有巨大潜力.赵明 陈石 Dave Yuen 2019地球物理学报2019,62,1:82
2A review of selective laser melting of aluminum alloys: Processing,microstructure, property and developing trends显示文摘Selective laser melting(SLM) is an attractive rapid prototyping technology for the fabrication of metallic components with complex structure and high performance. Aluminum alloy, one of the most pervasive structural materials, is well known for high specific strength and good corrosion resistance. But the poor laser formability of aluminum alloy restricts its application. There are problems such as limited processable materials, immature process conditions and metallurgical defects on SLM processing aluminum alloys. Some efforts have been made to solve the above problems. This paper discusses the current research status both related to the scientific understanding and technology applications. The paper begins with a brief introduction of basic concepts of aluminum alloys and technology characterization of laser selective melting. In addition, solidification theory of SLM process and formation mechanism of metallurgical defects are discussed. Then, the current research status of microstructure, properties and heat treatment of SLM processing aluminum alloys is systematically reviewed respectively. Lastly, a future outlook is given at the end of this review paper.Jinliang Zhang Bo Song Qingsong Wei Dave Bourell Yusheng Shi 2019Journal of Materials Science & Technology2019,35,2:77
3基于降雨渗流场变化的三峡库区白水河滑坡变形机制与预测显示文摘白水河滑坡位于三峡大坝以西56 km,为三峡库区重点监测滑坡之一。自2003年9月被纳入二期专业监测点以来,该滑坡一直被严密监测。2007年汛期该滑坡曾出现险情,并发布蓝色与橙色预警。目前,通过对该滑坡的监测积累了大量的监测数据,包括:地表GPS监测点位移、地下水位、钻孔测斜、滑坡推力、大气降雨以及三峡水库水位等。根据近十年的野外监测数据,该滑坡自2003年以来一直持续变形,降雨与库水位变化造成白水河滑坡地下水位变化,进而影响其整体稳定性。在强降雨和库水位同时下降的极端条件下,滑坡有可能加速变形。本文利用加拿大Geo-Studio岩土仿真软件SEEP/W模块模拟白水河滑坡在降雨入渗作用下瞬态渗流场,量化分析了白水河滑坡坡体内孔隙水压力变化与大气降雨之间的关系,并使用SIGMA/W模块,将瞬态孔隙水压力分布运用于滑坡变形分析中,探讨了该滑坡地表变形幅度与降雨强度之间的关系,以期为极端天气下水库区松散堆积层滑坡稳定性和变形机理分析提供借鉴。尚敏 徐鑫 Dave Chan 张国栋 梁鸿熙 2016中国地质灾害与防治学报2016,27,2:20
4战略规划:大都市地区有效治理的方向盘—大伦敦战略规划的演变与最新发展显示文摘20世纪的标志性特征之一是世界城市人口的增长.其中,1900年仅有5至6个城市区域拥有百万人口,而1990年这个数字达到286,最近的增长主要集中在亚洲、南美和非洲的经济快速增长地区(Gilbert et al, 1996).这些城市的增长为如何实现最有效的治理带来很多的问题,不仅仅是管理已有的城市人口,更在于如何调控未来的发展压力.本文试图介绍欧洲的百万城市之一--伦敦在20世纪中后期规划与发展演化的脉络,并分析其为保持作为欧洲的一个真正的全球性城市的地位,如何在21世纪初回应所遇到的挑战.Dave Shaw 王红扬 2001国外城市规划2001,,5:18
5Intelligent transportation systems for smart cities:a progress review显示文摘To better meet the challenge of providing effective,low-cost,energy efficient transport services,the concept of intelligent transport systems(ITS) has been proposed and lauded as an innovative and promising solution for next generation transport networks.In this paper,the progress of ITS research around the world is briefly reviewed and current challenges are outlined,thereby offering further insight into ITS development for all researchers in this area.XIONG Zhang SHENG Hao RONG WenGe COOPER Dave E 2012Science China(Information Sciences)2012,55,12:16
6压力对放电等离子烧结硬质合金性能的影响显示文摘采用放电等离子技术(SPS)烧结WC-12Co硬质合金。主要研究了SPS烧结过程中压力对WC-12Co硬质合金致密化、显微组织及性能的影响,并探讨了压力对致密化和WC晶粒长大的影响机制。结果表明,提高SPS烧结压力提高了WC-12Co硬质合金的密度但导致了WC晶粒的长大。在较低的烧结温度下(1100℃)或较短的保温时间内(3 min),烧结压力对密度的影响较为显著。在较高的烧结温度(1150℃)时,烧结压力的提高导致合金中WC晶粒的明显长大。烧结压力对SPS烧结WC-12Co硬质合金力学性能的影响是通过对密度和WC晶粒尺寸的影响而起作用的。李志林 朱丽慧 刘一雄 Dave Siddle 2009粉末冶金工业2009,19,1:15
7循环脱吸湿与加卸载耦合作用下土体持水性能试验研究显示文摘土体所经历的干湿循环和应力历史,对其孔隙结构和持水性能影响明显。为进一步深入研究二者耦合作用的影响,开展了先竖向固结再循环脱吸湿以及先气压脱湿再反复竖向加卸载两种不同加载路径的水分变化测量试验,探索土样持水性能和变形能力的演化规律。研究结果表明:(1)脱湿与吸湿路径对比,土体的持水能力具有明显的差异性,且土体越密实,这种差异性越强烈;(2)随着脱吸湿循环次数的增加,土样的进气值略有增大,减湿段和吸湿段的斜率都会减小,但影响趋势随循环次数增多而减弱;(3)对于气压减湿后的非饱和土样,其前期固结压力随气压值增加而增大,而加卸载形成的滞回圈的面积却随之减小,土体的持水性能和变形能力也降低;(4)重塑土样从不同加载路径首次达到同一应力状态时,先固结再脱湿路径下土样的体积收缩更多,而先施加气压再加载路径下土样持水性能减弱的更多。陈勇 苏剑 谈云志 CHAN Dave 2019岩土力学2019,40,8:13
8职业教育基本问题访谈录(I) 职业教育是什么显示文摘全国教育科学“十五”规划国家一般课题《职业教育几个基本问题研究》(BJA010100)课题组就“职业教育的基本问题”对国内外职业教育界的专家、学者进行了访谈,使我们看到了对此问题的不同角度和层面的理解。这是一次思想的碰撞,有利于我们深化对职业教育基本问题的认识。本刊特将访谈记录分专题编辑处理,并从本期起连续刊发,本期论题为“职业教育是什么?”王明达 杨金土 刘来泉 余祖光 高奇 Josie Misko Susan Dave Jorn Saunder 钱景舫 Friedhelm Eicker James R Stone 2006中国职业技术教育2006,22,14:12
9The enhanced X-ray Timing and Polarimetry mission—eXTP显示文摘In this paper we present the enhanced X-ray Timing and Polarimetry mission—eXTP. eXTP is a space science mission designed to study fundamental physics under extreme conditions of density, gravity and magnetism. The mission aims at determining the equation of state of matter at supra-nuclear density, measuring effects of QED, and understanding the dynamics of matter in strong-field gravity. In addition to investigating fundamental physics, eXTP will be a very powerful observatory for astrophysics that will provide observations of unprecedented quality on a variety of galactic and extragalactic objects. In particular, its wide field monitoring capabilities will be highly instrumental to detect the electro-magnetic counterparts of gravitational wave sources.The paper provides a detailed description of:(1) the technological and technical aspects, and the expected performance of the instruments of the scientific payload;(2) the elements and functions of the mission, from the spacecraft to the ground segment.ShuangNan Zhang Andrea Santangelo Marco Feroci YuPeng Xu FangJun Lu Yong Chen Hua Feng Shu Zhang Sφren Brandt Margarita Hernanz Luca Baldini Enrico Bozzo Riccardo Campana Alessandra De Rosa YongWei Dong Yuri Evangelista Vladimir Karas Norbert Meidinger Aline Meuris Kirpal Nandra Teng Pan Giovanni Pareschi Piotr Orleanski QiuShi Huang Stephane Schanne Giorgia Sironi Daniele Spiga Jiri Svoboda Gianpiero Tagliaferri Christoph Tenzer Andrea Vacchi Silvia Zane Dave Walton ZhanShan Wang Berend Winter Xin Wu Jean J.M.in't Zand Mahdi Ahangarianabhari Giovanni Ambrosi Filippo Ambrosino Marco Barbera Stefano Basso Jörg Bayer Ronaldo Bellazzini Pierluigi Bellutti Bruna Bertucci Giuseppe Bertuccio Giacomo Borghi XueLei Cao Franck Cadoux Francesco Ceraudo TianXiang Chen Yu Peng Chen Jerome Chevenez Marta Civitani Wei Cui WeiWei Cui Thomas Dauser Ettore Del Monte Sergio Di Cosimo Sebastian Diebold Victor Doroshenko Michal Dovciak YuanYuan Du Lorenzo Ducci QingMei Fan Yannick Favre Fabio Fuschino JoséLuis Ga'lvez Min Gao MingYu Ge Olivier Gevin Marco Grassi QuanYing Gu YuDong Gu DaWei Han Bin Hong Wei Hu Long Ji ShuMei Jia WeiChun Jiang Thomas Kennedy Ingo Kreykenbohm Irfan Kuvvetli Claudio Labanti Luca Latronico Gang Li MaoShun Li Xian Li Wei Li ZhengWei Li Olivier Limousin HongWei Liu XiaoJing Liu Bo Lu Tao Luo Daniele Macera Piero Malcovati Adrian Martindale Malgorzata Michalska Bin Meng Massimo Minuti Alfredo Morbidini Fabio Muleri Stephane Paltani Emanuele Perinati Antonino Picciotto Claudio Piemonte JinLu Qu Alexandre Rachevski Irina Rashevskaya Jerome Rodriguez Thomas Schanz ZhengXiang Shen LiZhi Sheng JiangBo Song LiMing Song Carmelo Sgro Liang Sun Ying Tan Phil Uttley Bo Wang DianLong Wang GuoFeng Wang Juan Wang LangPing Wang YuSa Wang Anna L.Watts XiangYang Wen Jörn Wilms ShaoLin Xiong JiaWei Yang Sheng Yang YanJi Yang Nian Yu WenDa Zhang Gianluigi Zampa Nicola Zampa Andrzej A.Zdziarski AiMei Zhang ChengMo Zhang Fan Zhang Long Zhang Tong Zhang Yi Zhang XiaoLi Zhang ZiLiang Zhang BaoSheng Zhao ShiJie Zheng Yu Peng Zhou Nicola Zorzi J.Frans Zwart 2019Science China(Physics,Mechanics & Astronomy)2019,62,2:11
10Is endoscopic ultrasound examination necessary in the management of esophageal cancer?显示文摘Despite substantial efforts at early diagnosis, accurate staging and advanced treatments, esophageal cancer(EC) continues to be an ominous disease worldwide. Risk factors for esophageal carcinomas include obesity, gastroesophageal reflux disease, hard-alcohol use and tobacco smoking. Five-year survival rates have improved from 5% to 20% since the 1970 s, the result of advances in diagnostic staging and treatment. As the most sensitive test for locoregional staging of EC, endoscopic ultrasound(EUS) influences the development of an optimal oncologic treatment plan for a significant minority of patients with early cancers, which appropriately balances the risks and benefits of surgery, chemotherapy and radiation. EUS is costly, and may not be available at all centers. Thus, the yield of EUS needs to be thoughtfully considered for each patient. Localized intramucosal cancers occasionally require endoscopic resection(ER) for histologic staging or treatment; EUS evaluation may detect suspicious lymph nodes prior to exposing the patient to the risks of ER. Although positron emission tomography(PET) has been increasingly utilized in staging EC, it may be unnecessary for clinical staging of early, localized EC and carries the risk of false-positive metastasis(over staging). In EC patients with evidence of advanced disease, EUS or PET may be used to define the radiotherapy field. Multimodality staging with EUS, crosssectional imaging and histopathologic analysis of ER, remains the standard-of-care in the evaluation of early esophageal cancers. Herein, published data regarding use of EUS for intramucosal, local, regional and metastatic esophageal cancers are reviewed. An algorithm to illustrate the current use of EUS at The University of Texas MD Anderson Cancer Center is presented.Tomas DaVee Jaffer A Ajani Jeffrey H Lee 2017World Journal of Gastroenterology2017,23,5:11
11库水循环加卸载条件下岸坡饱和土体变形特性试验研究显示文摘水库运行期水位每年周期性涨落,岸坡土体在库水循环加卸载作用下会发生不同程度的阶梯状变形。为探求循环加卸载对岸坡深部变形的诱发机理,本文以水库防洪限制水位以下岸坡土体为研究对象,在饱和土应力路径三轴试验过程中,控制非等向受压试样的孔隙水压力周期变化,模拟岸坡土体的水力-力学状态,实时测定土体的周期性变形特性及破坏特征。研究结果表明:等偏应力孔压循环加卸载过程中,试样剪应变为台阶式上升趋势,而体应变是循环的弹性变化;孔压持续增大造成试样破坏呈现脆变和剪胀的特征。最后,结合等偏应力孔压增大条件下粉质黏土的破坏特征与常规三轴剪切试验成果,对比两种应力路径下试样的有效应力比和剪应变的发展过程,分析了其强度差异的内在原因。陈勇 韦双 Dave Chan 2015水利学报2015,46,5:10
12Smart City Architecture: A Technology Guide for Implementation and Design Challenges显示文摘Urban development is becoming increasingly reliant on effective use of intelligent services.In the process of providing better services to all citizens and improving the efficiency of administration processes,the concept of a smart city has been lauded as a promising solution for the coming challenge of global urbanization.However,due to the broad scope of smart cities their definition has not been standardized,thus proposed architectures are diverse.This work proposes a new architecture from the perspective of the data that underpins all the functionality of smart cities.The proposed architecture is discussed,outlining design challenges and offering insight into the development of smart cities.RONG Wenge XIONG Zhang COOPER Dave LI Chao SHENG Hao 2014China Communications2014,11,3:9
13Two gap-free reference genomes and a global view of the centromere architecture in rice显示文摘Rice(Oryza sativa),a major staple throughout the world and a model system for plant genomics and breeding,was the first crop genome sequenced almost two decades ago.However,reference genomes for all higher organisms to date contain gaps and missing sequences.Here,we report the assembly and analysis of gap-free reference genome sequences for two elite O.sativa xian/indica rice varieties,Zhenshan 97 and Minghui 63,which are being used as a model system for studying heterosis and yield.Gap-free reference genomes provide the opportunity for a global view of the structure and function of centromeres.We show that all rice centromeric regions share conserved centromere-specific satellite motifs with different copy numbers and structures.In addition,the similarity of CentO repeats in the same chromosome is higher than across chromosomes,supporting a model of local expansion and homogenization.Both genomes have over 395 non-TE genes located in centromere regions,of which∼41%are actively transcribed.Two large structural variants at the end of chromosome 11 affect the copy number of resistance genes between the two genomes.The availability of the two gap-free genomes lays a solid foundation for further understanding genome structure and function in plants and breeding climate-resilient varieties.Jia-Ming Song Wen-Zhao Xie Shuo Wang Yi-Xiong Guo Dal-Hoe Koo Dave Kudrna Chenbo Gong Yicheng Huang Jia-Wu Feng Wenhui Zhang Yong Zhou Andrea Zuccolo Evan Long Seunghee Lee Jayson Talag Run Zhou Xi-Tong Zhu Daojun Yuan Joshua Udall Weibo Xie Rod AWing Qifa Zhang Jesse Poland Jianwei Zhang Ling-Ling Chen 2021Molecular Plant2021,14,10:9
14用于轻金属切削的新工具涂层显示文摘新的碳基涂层已被发展用于切削轻金属 (如铝 )。这类涂层能直接用于工具上或者作为另一种硬质涂层的顶层。切削试验显示 :这类涂层对于容易粘附在工具上的材料 (如铝合金 )具有良好的切削性能 ,因为显著地减少了所谓的切屑瘤 (BUE)的出现。结果延长了工具的寿命并使工件材料在切削后表面光滑。特别是在干切削和深孔加工方面 ,涂层性能非常好。关于涂层性能的观察及原始切削结果将逐一介绍。本文也将介绍由一家主导欧洲的航空航天工业的制造商最近完成的工业领域的试验结果。切削力、切屑瘤的形成和表面粗糙度等数据将用来解释整个干切削过程。Dave Doerwald Thomas Krug Roel Tietema Wei-Ming Sim Quanshun Luo Papken Hovsepian 林松盛 代明江 2004国外金属热处理2004,25,5:7
15人力资源的四个新角色显示文摘戴夫·乌尔里克,被誉为人力资源管理的开创者,他最早提出了'人力资源'(human resource,HR)的概念.在此之前,人力资源被叫做'人事管理'(human management).乌尔里克认为,现在唯一剩下的有竞争力的武器就是组织,因为那些传统的竞争要素,如成本、技术、分销、制造以及产品特性,或早或晚都能被复制,它们无法保证你就是赢家.在新经济中,胜利将来源于组织能力,包括速度、响应性、敏捷性、学习能力和员工素质.而人力资源部的新使命就牵涉到卓越的组织能力的培养.戴夫·乌尔里克(Dave Ulrich) 2005管理与财富2005,,11:7
16Silicon and silicon nitride photonic circuits for spectroscopic sensing on-a-chip [Invited]显示文摘There is a rapidly growing demand to use silicon and silicon nitride(Si3N4) integrated photonics for sensing applications, ranging from refractive index to spectroscopic sensing. By making use of advanced CMOS technology,complex miniaturized circuits can be easily realized on a large scale and at a low cost covering visible to mid-IR wavelengths. In this paper we present our recent work on the development of silicon and Si3N4-based photonic integrated circuits for various spectroscopic sensing applications. We report our findings on waveguide-based absorption, and Raman and surface enhanced Raman spectroscopy. Finally we report on-chip spectrometers and on-chip broadband light sources covering very near-IR to mid-IR wavelengths to realize fully integrated spectroscopic systems on a chip.Ananth Z.Subramanian Eva Ryckeboer Ashim Dhakal Frédéric Peyskens Aditya Malik Bart Kuyken Haolan Zhao Shibnath Pathak Alfonso Ruocco Andreas De Groote Pieter Wuytens Daan Martens Francois Leo Weiqiang Xie Utsav Deepak Dave Muhammad Muneeb Pol Van Dorpe Joris Van Campenhout Wim Bogaerts Peter Bienstman Nicolas Le Thomas Dries Van Thourhout Zeger Hens Gunther Roelkens Roel Baets 2015Photonics Research2015,3,5:7
17放电等离子烧结和真空烧结超细WC-12Co硬质合金显示文摘对比研究了放电等离子烧结(SPS)和真空烧结(VAS)平均粒径为160nm的WC-12Co硬质合金的组织和性能。研究结果表明:SPS烧结能使WC-12Co在较低温度、较短时间内完全致密化,烧结温度比真空烧结低250℃以上,烧结时间只有真空烧结的1/26。相对于真空烧结,SPS烧结的晶粒更细,硬度提高1.5%以上,抗弯强度提高12.6%以上。余洋 朱丽慧 刘一雄 Dave Siddle 2008上海金属2008,30,5:7
18基于孔隙水压力变化的三峡库区盐关滑坡破坏机制分析显示文摘2017年10月30日,位于秭归县归州镇香溪河右岸的盐关滑坡发生整体滑移破坏,成为近年来三峡库区为数不多的整体破坏变形的滑坡之一。根据现场应急调查,滑坡在不到3天的时间内经历了预警直至完全破坏的过程。本文以盐关滑坡为实例,根据滑坡失稳破坏特征结合有效应力原理提出了孔隙水压力变化速率条件下滑坡失稳破坏的模式,分析出滑坡体内的孔隙水压力对滑坡破坏的影响,最后通过有限元模拟软件予以验证。利用Geo-Studio岩土仿真软件SEEP/W模块模拟盐关滑坡在降雨入渗作用下的渗流场,结合滑坡变形期直至破坏时的实际库水位值计算出孔隙水压力随时间变化曲线,并且将所得结果应用到Slope/W模块,计算出滑坡的安全系数随时间的变化曲线,从而验证出滑坡失稳破坏的主要原因是滑坡内部土体在降雨和库水位的作用下达到饱和后,孔隙水压力激增所导致的。尚敏 刘昱廷 DAVE Chan 廖芬 2021工程地质学报2021,29,3:7
19空间误差补偿技术在大型多轴机床标定中的实用方法显示文摘经过理论与实践的证实,空间误差补偿方法被认定为是可以大幅度提高机床工作精度的实用方法。VEC对机床的测量、调校贯穿于机床在其工作空间内运动的整个过程,所以使用VEC方法既可以对动态误差进行实时补偿,又可以测得机床运动时相关的几何效应,从而对机床误差实行更为精准的补偿。Dave Maxham 2010航空制造技术2010,53,13:6
20Ground response to high horizontal stresses during longwall retreat and its implications for longwall headgate support显示文摘Roof falls in longwall headgate can occur when weak roof and high horizontal stress are present. To prevent roof falls in the headgate under high horizontal stress, it is important to understand the ground response to high horizontal stress in the longwall headgate and the requirements for supplemental roof support. In this study, a longwall headgate under high horizontal stress was instrumented to monitor stress change in the pillars, deformations in the roof, and load in the cable bolts. The conditions in the headgate were monitored for about six months as the longwall face passed by the instrumented site.The roof behavior in the headgate near the face was carefully observed during longwall retreat.Numerical modeling was performed to correlate the modeling results with underground observation and instrumentation data and to quantify the effect of high horizontal stress on roof stability in the longwall headgate. This paper discusses roof support requirements in the longwall headgate under high horizontal stress in regard to the pattern of supplemental cable bolts and the critical locations where additional supplemental support is necessary.Peter Zhang Dave Gearhart Mark Van Dyke Daniel Su Essie Esterhuizen Berk Tulu 2019International Journal of Mining Science and Technology2019,29,1:6
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