检索结果-南通市图书馆

Predicting roof-surface wind pressure induced by conical vortex using a BP neural network combined with POD

在线全文

学校读者我要写书评

暂无评论

Building Simulation 2022年第8期15卷 1475-1490页

作者： Fubin Chen Wen kang Zhenru Shu Qiusheng Li yi Li yFrank Chen kang Zhou School of Civil Engineering Changsha University of Science and TechnologyChangsha410082China School of Civil Engineering Central South UniversityChangsha410083China Department of Architecture and Civil Engineering City University of Hong KongKowloonHong KongChina Hunan Provincial Key Laboratory of Structures for Wind Resistance and Vibration Control&School of Civil Engineering Hunan University of Science and TechnologyXiangtan411201China Department of Civil Engineering The Pennsylvania State UniversityMiddletownPA 17057USA

This study aims to examine the feasibility of predicting surface wind pressure induced by conical vortex using a backpropagation neural network(BPNN)combined with proper orthogonal decomposition(POD),in which a 1:150 scaled model with a large-span retractable roof was tested in wind tunnel under both laminar and turbulent flow *** distributions of mean and fluctuating wind pressure coefficients were first described,and the effects of inflow turbulence,wind direction,roof opening were examined *** the prediction of wind pressure,the POD-BPNN model was trained using measurement data from adjacent *** prediction results are overall *** root-mean-square-error(RMSE)between test and predicted data lies mostly within 10%.In particular,the prediction of mean wind pressure is found to be better than that of fluctuating wind *** outcomes in this study highlight that the proposed POD-BPNN model can be well used as a useful tool to predict surface wind pressure.

关键词： wind tunnel test-roof-surface wind pressure conical vortex proper orthogonal decomposition(POD) backpropagation neural network(BPNN)

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

三级公立精神专科医院康复治疗师现况调查

中国心理卫生杂志 2024年第1期38卷 63-67页

作者：康轶群刘晋宁杨云龙张丽丽张云淑栗克清河北大学公共卫生学院河北保定071000 河北省精神卫生中心河北省重大精神与行为障碍疾病研究重点实验室河北大学第六临床医学院河北保定071000

目的:了解我国三级公立精神专科医院康复治疗师的年龄、职称、受教育程度等基本情况,为精神康复人才队伍建设提供基础数据。方法:调查我国43家三级公立精神专科医院康复治疗师的人员配置情况,对康复治疗师的年龄、受教育程度、职称、专... 详细信息

目的:了解我国三级公立精神专科医院康复治疗师的年龄、职称、受教育程度等基本情况,为精神康复人才队伍建设提供基础数据。方法:调查我国43家三级公立精神专科医院康复治疗师的人员配置情况,对康复治疗师的年龄、受教育程度、职称、专业相关度及区域间差异进行统计分析。结果:本次调查的43家医院中康复治疗师共197名,年龄构成主要集中在20~30岁和30~40岁,以本科受教育程度和初级职称为主,半数以上的人员第一受教育专业和康复专业相关。东、中、西部地区的康复治疗师在年龄、受教育程度、职称方面的差异均有统计学意义。结论:我国三级公立精神专科医院康复治疗师队伍整体素质较高,年龄结构相对合理,但高级职称比例偏低,未来应注重人才培养和晋升制度的建立,以提高整个行业的职业发展空间和水平。

关键词：精神康复现况调查康复治疗师

Evidence for particle acceleration approaching PeV energies in the W51 complex

在线全文

学校读者我要写书评

暂无评论

Science Bulletin 2024年第18期69卷 2833-2841页

作者： LHAASO Collaboration Zhen Cao F.Aharonian Axikegu y.X.Bai y.W.Bao D.Bastieri X.J.Bi y.J.Bi W.Bian A.V.Bukevich Q.Cao W.y.Cao Zhe Cao J.Chang J.F.Chang A.M.Chen E.S.Chen H.X.Chen Liang Chen Lin Chen Long Chen M.J.Chen M.L.Chen Q.H.Chen S.Chen S.H.Chen S.Z.Chen T.L.Chen y.Chen N.Cheng y.D.Cheng M.y.Cui S.W.Cui X.H.Cui y.D.Cui B.Z.Dai H.L.Dai Z.G.Dai Danzengluobu X.Q.Dong K.K.Duan J.H.Fan y.Z.Fan J.Fang J.H.Fang K.Fang C.F.Feng H.Feng L.Feng S.H.Feng X.T.Feng y.Feng y.L.Feng S.Gabici B.Gao C.D.Gao Q.Gao W.Gao W.K.Gao M.M.Ge L.S.Geng G.Giacinti G.H.Gong Q.B.Gou M.H.Gu F.L.Guo X.L.Guo y.Q.Guo y.y.Guo y.A.Han M.Hasan H.H.He H.N.He J.y.He y.He y.K.Hor B.W.Hou C.Hou X.Hou H.B.Hu Q.Hu S.C.Hu D.H.Huang T.Q.Huang W.J.Huang X.T.Huang X.y.Huang y.Huang X.L.Ji H.y.Jia K.Jia K.Jiang X.W.Jiang Z.J.Jiang M.Jin M.M.kang I.Karpikov D.Kuleshov K.Kurinov B.B.Li C.M.Li Cheng Li Cong Li D.Li F.Li H.B.Li H.C.Li Jian Li Jie Li K.Li S.D.Li W.L.Li W.L.Li X.R.Li Xin Li y.Z.Li Zhe Li Zhuo Li E.W.Liang y.F.Liang S.J.Lin B.Liu C.Liu D.Liu D.B.Liu H.Liu H.D.Liu J.Liu J.L.Liu M.y.Liu R.y.Liu S.M.Liu W.Liu y.Liu y.N.Liu Q.Luo y.Luo H.K.Lv B.Q.Ma L.L.Ma X.H.Ma J.R.Mao Z.Min W.Mitthumsiri H.J.Mu y.C.Nan A.Neronov L.J.Ou P.Pattarakijwanich Z.y.Pei J.C.Qi M.y.Qi B.Q.Qiao J.J.Qin A.Raza D.Ruffolo A.Sáiz M.Saeed D.Semikoz L.Shao O.Shchegolev X.D.Sheng F.W.Shu H.C.Song yu.V.Stenkin V.Stepanov y.Su D.X.Sun Q.N.Sun X.N.Sun Z.B.Sun J.Takata P.H.T.Tam Q.W.Tang R.Tang Z.B.Tang W.W.Tian C.Wang C.B.Wang G.W.Wang H.G.Wang H.H.Wang J.C.Wang Kai Wang Kai Wang L.P.Wang L.y.Wang P.H.Wang R.Wang W.Wang X.G.Wang X.y.Wang y.Wang y.D.Wang y.J.Wang Z.H.Wang Z.X.Wang Zhen Wang Zheng Wang D.M.Wei J.J.Wei y.J.Wei T.Wen C.y.Wu H.R.Wu Q.W.Wu S.Wu X.F.Wu y.S.Wu S.Q.Xi J.Xia G.M.Xiang D.X.Xiao G.Xiao y.L.Xin y.Xing D.R.Xiong Z.Xiong D.L.Xu R.F.Xu R.X.Xu W.L.Xu L.Xue D.H.yan J.Z.yan T.yan C.W.yang C.y.yang F.yang F.F.yang L.L.yang M.J.yang R.Z.yang W.X.yang y.H.yao Z.G.yao L.Q.yin N.yin X.H.you Z.y.you y.H.yu Q.yuan H.yue H.D.Zeng T.X.Zeng W.Zeng M.Zha B.B.Zhang F.Zhang H.Zhang 不详 Key Laboratory of Particle Astrophysics&Experimental Physics Division&Computing Center Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China TIANFU Cosmic Ray Research Center ChengduChina Dublin Institute for Advanced Studies 31 Fitzwilliam Place2 DublinIreland Max-Planck-Institut for Nuclear Physics P.O.Box 103980Heidelberg 69029Germany School of Physical Science and Technology&School of Information Science and Technology Southwest Jiaotong UniversityChengdu 610031China School of Astronomy and Space Science Nanjing UniversityNanjing 210023China Center for Astrophysics Guangzhou UniversityGuangzhou 510006China Tsung-Dao Lee Institute&School of Physics and Astronomy Shanghai Jiao Tong UniversityShanghai 200240China Institute for Nuclear Research of Russian Academy of Sciences Moscow 117312Russia Hebei Normal University Shijiazhuang 050024China University of Science and Technology of China Hefei 230026China State Key Laboratory of Particle Detection and Electronics China Key Laboratory of Dark Matter and Space Astronomy&Key Laboratory of Radio Astronomy Purple Mountain ObservatoryChinese Academy of SciencesNanjing 210023China Research Center for Astronomical Computing Zhejiang LaboratoryHangzhou 311121China Key Laboratory for Research in Galaxies and Cosmology Shanghai Astronomical ObservatoryChinese Academy of SciencesShanghai 200030China School of Physics and Astronomy Yunnan UniversityKunming 650091China Key Laboratory of Cosmic Rays(Tibet University) Ministry of EducationLhasa 850000China National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China School of Physics and Astronomy(Zhuhai)&School of Physics(Guangzhou)&Sino-French Institute of Nuclear Engineering and Technology(Zhuhai) Sun Yat-sen UniversityZhuhai 519000&Guangzhou 510275GuangdongChina Institute of Frontier and Interdisciplinary Science Shandong UniversityQingdao 266237China APC UniversitéParis Cité

Theγ-ray emission from the W51 complex is widely acknowledged to be attributed to the interaction between the cosmic rays(CRs)accelerated by the shock of supernova remnant(SNR)W51C and the dense molecular clouds in the adjacent star-forming region,***,the maximum acceleration capability of W51C for CRs remains *** on observations conducted with the Large High Altitude Air Shower Observatory(LHAASO),we report a significant detection ofγrays emanating from the W51 complex,with energies from 2 to 200 *** LHAASO measurements,for the first time,extend theγ-ray emission from the W51 complex beyond 100 TeV and reveal a significant spectrum bending at tens of *** combining the"π^(0)-decay bump"featured data from Fermi-LAT,the broadbandγ-ray spectrum of the W51 region can be well-characterized by a simple pp-collision *** observed spectral bending feature suggests an exponential cutoff at~400 TeV or a power-law break at~200 TeV in the CR proton spectrum,most likely providing the first evidence of SNRs serving as CR accelerators approaching the PeV ***,two young star clusters within W51B could also be theoretically viable to produce the most energeticγrays observed by *** findings strongly support the presence of extreme CR accelerators within the W51 complex and provide new insights into the origin of Galactic CRs.

关键词： UHE c-ray Cosmic rays SNR W51C Star clusters

Pencil-beam scanning catheter for intracoronary optical coherence tomography

在线全文

学校读者我要写书评

暂无评论

Opto-Electronic Advances 2022年第3期5卷 69-75页

作者： Jiqiang kang Rui Zhu yunxu Sun Jianan Li Kenneth K.y.Wong School of Electronic and Information Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China International Graduate School at Shenzhen Tsinghua UniversityShenzhen 518055China Shenzhen Vivolight Medical Device&Technology Co. Ltd.Shenzhen 518055China State Key Laboratory of Transient Optics and Photonics Xi’an Institute of Optics and Precision MechanicsChinese Academy of SciencesXi’an 710119China Department of Electrical and Electronic Engineering The University of Hong KongPokfulam RoadHong KongChina Advanced Biomedical Instrumentation Centre Hong Kong Science ParkShatinNew TerritoriesHong KongChina

Current gradient-index(GRIN)lens based proximal-driven intracoronary optical coherence tomography(ICOCT)probes consist of a spacer and a GRIN lens with large gradient *** design provides great flexibility to control beam profiles,but the spacer length should be well controlled to obtain desired beam profiles and thus it sets an obstacle in mass catheter ***,although GRIN lens with large gradient constant can provide tight focus spot,it has short depth of focus and fast-expanded beam which leads to poor lateral resolution for deep *** this paper,a type of spacer-removed probe is demonstrated with a small gradient constant GRIN *** design simplifies the fabrica-tion process and is suitable for mass *** output beam of the catheter is a narrow nearly collimated light beam,referred to as pencil beam *** full width at half maximum beam size varies from 35.1μm to 75.3μm in air over 3-mm *** design principles are elaborated with probe/catheter fabrication and performance *** in vivo imaging of the catheter was verified by a clinical ICOCT *** results prove that this novel pencil-beam scanning catheter is potentially a good choice for ICOCT systems.

关键词： optical coherence tomography endoscopic imaging intravascular imaging fiber optics imaging

基于产前3.0 T MRI true FISP序列胎儿腰椎发育与孕周关系的影像学观察

在线全文

学校读者我要写书评

暂无评论

中华解剖与临床杂志 2024年第2期29卷 83-87页

作者：张辉康琦尚华马得廷青岛大学附属泰安市中心医院医学影像中心泰安271000

目的探讨孕中晚期宫内胎儿腰椎3.0 T MRI真稳态进动梯度回波序列(true FISP)矢状位二维定量指标与孕周的关系。方法横断面研究。纳入2020年1月—2023年4月青岛大学附属泰安市中心医院行产前MRI检查的59例胎儿的影像资料。孕妇年龄19~41(... 详细信息

目的探讨孕中晚期宫内胎儿腰椎3.0 T MRI真稳态进动梯度回波序列(true FISP)矢状位二维定量指标与孕周的关系。方法横断面研究。纳入2020年1月—2023年4月青岛大学附属泰安市中心医院行产前MRI检查的59例胎儿的影像资料。孕妇年龄19~41(29.8±5.1)岁,孕周26^(+1)~39^(+2)(32.7±3.7)周。采用3.0 T MR扫描仪对胎儿行MRI检查,采集true FISP图像。在true FISP图像上测量腰椎长轴矢状位二维定量指标(腰椎总长度,L_(1)、L_(3)椎体骨化中心的上下径、前后径)。分析胎儿腰椎二维定量指标与孕周的相关性,并应用线性回归分析获得相应的腰椎生长动力学回归方程。结果59例胎儿腰椎总长度及L1和L3椎体骨化中心的上下径、前后径与孕周均呈正相关,差异均有统计学意义(r=0.79~0.95,P值均y_(腰椎总长度)=-0.153+0.141 X_(孕周)(R^(2)=0.90,Py_(L_(1)上下径)=-0.226+0.023 X_(孕周)(R^(2)=0.77,Py_(L_(3)上下径)=-0.264+0.025 X_(孕周)(R^(2)=0.80,Py_(L_(1)前后径)=-0.284+0.029 X_(孕周)(R^(2)=0.63,Py_(L_(3)前后径)=-0.274+0.030 X_(孕周)(R^(2)=0.63,P<0.001)。结论孕中晚期胎儿腰椎3.0 T MRI true FISP序列矢状位二维定量指标与孕周均呈正相关,生长动力学特征符合线性回归模型,可为产前评估胎儿的腰椎发育情况提供参考。

关键词：胎儿发育腰椎磁共振成像真稳态进动梯度回波序列产前检查

在线全文

学校读者我要写书评

暂无评论

一体化压铸铝合金前机舱轻量化设计与优化

汽车工程 2024年第7期46卷 1314-1322,1333页

作者：方志凌宋燕利康洁张杏红张丹东风汽车集团有限公司研发总院武汉430056 武汉理工大学现代汽车零部件技术湖北省重点实验室武汉430070

当前汽车行业对低碳化和轻量化的需求日益增长,新型一体化压铸技术应用于车身,能够实现质量、生产成本和周期的下降,并减少碳排放,成为各大汽车主机厂商争相研究热点。本文将某乘用车传统钢制车身前端机舱结构替换成一体化压铸件,对铝... 详细信息

当前汽车行业对低碳化和轻量化的需求日益增长,新型一体化压铸技术应用于车身,能够实现质量、生产成本和周期的下降,并减少碳排放,成为各大汽车主机厂商争相研究热点。本文将某乘用车传统钢制车身前端机舱结构替换成一体化压铸件,对铝合金一体化前机舱进行了轻量化设计。通过SIMP法对前舱进行拓扑优化得到了最优刚度载荷路径,考虑前舱可铸造性对筋的拔模方向、厚度尺寸和位置分布进行设计。根据C-NCAP 2021进行正面碰撞仿真,通过田口实验设计方法与响应面优化改善了一体化压铸车身的耐撞性,并对优化后的白车身性能进行了仿真分析。与传统方案相比,一体化方案的质量减轻13.9%,白车身弯曲刚度提升9.7%,1阶模态达到要求。本文研究对后续一体化车身结构的平台化设计与工程应用具有指导意义。

关键词：一体化压铸轻量化设计耐撞性前机舱

求解不可分离非凸非光滑问题的线性惯性ADMM算法

在线全文

学校读者我要写书评

暂无评论

计算机科学 2024年第5期51卷 232-241页

作者：刘洋刘康王永全华东政法大学智能科学与信息法学系上海201620 上海理工大学管理学院上海200093

针对目标函数中包含耦合函数H(x,y)的非凸非光滑极小化问题,提出了一种线性惯性交替乘子方向法(Linear Inertial Alternating Direction Method of Multipliers,LIADMM)。为了方便子问题的求解,对目标函数中的耦合函数H(x,y)进行线性化... 详细信息

针对目标函数中包含耦合函数H(x,y)的非凸非光滑极小化问题,提出了一种线性惯性交替乘子方向法(Linear Inertial Alternating Direction Method of Multipliers,LIADMM)。为了方便子问题的求解,对目标函数中的耦合函数H(x,y)进行线性化处理,并在x-子问题中引入惯性效应。在适当的假设条件下,建立了算法的全局收敛性;同时引入满足Kurdyka-Lojasiewicz不等式的辅助函数,验证了算法的强收敛性。通过两个数值实验表明,引入惯性效应的算法比没有惯性效应的算法收敛性能更好。

关键词：耦合函数H(x,y) 非凸非光滑优化交替乘子方向法惯性效应 Kurdyka-Lojasiewicz不等式

Non-contact evaluation of the resonant frequency of a microstructure using ultrasonic wave

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2010年第2期26卷 317-323页

作者： X. kang X. y. He C.J. Tay C. Quan Department of Applied Mechanics Nanjing University of Science and Technology 210094 Nanjing China Institute of Engineering Mechanics Southeast University210096 Nanjing China Department of Mechanical Engineering National Universityof Singapore 9 Engineering Drive 1 117576 Singapore Singapore

This paper presents a novel non-contact method for evaluating the resonant frequency of a microstructure, Firstly, the microstructure under test is excited by ultrasonic waves. This excitation method does not impose any undefined load on the specimen like the electrostatic excitation and also this is the first actual use of ultrasonic wave for exciting a microstructure in the literature. Secondly, the amplitudes of the microstructure are determined by image edge detection using a Mexican hat wavelet transform on the vibrating images of the microstructure. The vibrating images are captured by a CCD camera when the microstructure is vibrated by ultrasonic waves at a series of discrete high frequencies （〉30 kHz）. Upon processing the vibrating images, the amplitudes at various excitation frequencies are obtained and an amplitude-frequency spectrum is obtained from which the resonant frequency is subsequently evaluated. A micro silicon structure consisting of a perforated plate （192 × 192 μm） and two cantilever beams （76 × 43 μm） which is about 4 μm thickness is tested. Since laser interferometry is not required, thermal effects on a test object can be avoided. Hence, the setup is relatively simple. Results show that the proposed method is a simple and effective approach for evaluating the dynamic characteristics of microstructures.

关键词： Non-contact Microstructure· Resonant frequency Ultrasonic wave Image processing

新形势下建设项目竣工环境保护验收突出问题研析

在线全文

学校读者我要写书评

暂无评论

皮革制作与环保科技 2024年第1期5卷 187-189页

作者：康成芳甘肃省生态环境工程评估中心甘肃兰州730030

通过研析2020年以来建设项目竣工环境保护验收报告效果评估结果,总结企业自主验收现状及事中事后监管情况。对建设单位、技术机构、管理部门三方工作的主要问题进行简要分析,提出开展宣传与培训、加大验收效果评估、加强各部门联动、建... 详细信息

通过研析2020年以来建设项目竣工环境保护验收报告效果评估结果,总结企业自主验收现状及事中事后监管情况。对建设单位、技术机构、管理部门三方工作的主要问题进行简要分析,提出开展宣传与培训、加大验收效果评估、加强各部门联动、建立专项专家库等建议,特别提出加强各部门间信息共享与联动,做到奖罚分明,发现问题同步报送、同步解决,将问题整改纳入建设单位后续考评及信誉条件,为后期建设单位更规范地开展自主竣工环境保护验收工作提供科学参考。

关键词：建设项目环保验收建设单位问题整改