检索结果-南通市图书馆

Effective data sampling strategies and boundary condition constraints of physics-informed neural networks for identifying material properties in solid mechanics

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2023年第7期44卷 1039-1068页

作者： w.wu M.DANEKER M.A.JOLLEY K.T.TURNER L.LU Department of Anesthesiology and Critical Care Medicine Children's Hospital of PhiladelphiaPhiladelphiaPA 19104U.S.A. Division of Pediatric Cardiology Children's Hospital of PhiladelphiaPhiladelphiaPA 19104U.S.A. Department of Chemical and Biomolecular Engineering University of PennsylvaniaPhiladelphiaPA 19104U.S.A. Department of Mechanical Engineering and Applied Mechanics University of PennsylvaniaPhiladelphiaPA 19104U.S.A.

Material identification is critical for understanding the relationship between mechanical properties and the associated mechanical ***,material identification is a challenging task,especially when the characteristic of the material is highly nonlinear in nature,as is common in biological *** this work,we identify unknown material properties in continuum solid mechanics via physics-informed neural networks(PINNs).To improve the accuracy and efficiency of PINNs,we develop efficient strategies to nonuniformly sample observational *** also investigate different approaches to enforce Dirichlet-type boundary conditions(BCs)as soft or hard ***,we apply the proposed methods to a diverse set of time-dependent and time-independent solid mechanic examples that span linear elastic and hyperelastic material *** estimated material parameters achieve relative errors of less than 1%.As such,this work is relevant to diverse applications,including optimizing structural integrity and developing novel materials.

关键词： solid mechanics material identification physics-informed neural network(PINN) data sampling boundary condition(BC)constraint

Single Crystal Growth and Magnetoresistivity of Topological Semimetal CoSi

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2019年第7期36卷 77-81页

作者： D.S.wu Z.Y.Mi Y.J.Li w.wu P.L.Li Y.T.Song G.T.Liu G.Li J L.Luo Institute of Physics and Beijing National Laboratory for Condensed Matter Physics Chinese Academy of Sciences Beijing 100190 School of Physical Sciences University of Chinese Academy of Sciences Beijing 100190 Songshan Lake Materials Laboratory Dongguan 523808

we report single crystal growth of CoSi, which has recently been recognized as a new type of topological semimetal hosting fourfold and sixfold degenerate nodes. The Shubnikov–de Haas quantum oscillation(QO) is observed on our crystals. There are two frequencies originating from almost isotropic bulk electron Fermi surfaces, in accordance with band structure calculations. The effective mass, scattering rate, and QO phase difference of the two frequencies are extracted and discussed.

关键词： single crystal growth been recognized as extracted and discussed

Design of surface-electrode ion trap based on high-performance trapping and shutting ions

在线全文

学校读者我要写书评

暂无评论

Design of surface-electrode ion trap based on high-performan...

Development and application of a modular test system for the HV-CMOS pixel sensor R&D of the ATLAS HL-LHC upgrade

第十八届全国量子光学学术会议

作者：张鑫方 B.Q.Ou w.wu P.Xi.Chen 中国人民解放军国防科学技术大学 Department of Physics College of Liberal Arts and SciencesNational University of Defense Technology

we design a novel surface-electrode ion trap based on the micro-structure Paul trap model, which can realize transport with low heating rate and expand quantum qubits in the radial direction, and the most important it can overcome the difficulties of cooling ions on the surface chip and the design of symmetrical radiofrequency electrodes make the DC control more convenient. we also discuss the design and optimization of junctions between high performable five-line trap and radiofrequency ion-trap arrays that enable realize multiple cooled ions and expand quantum qubit on chip device. A detailed description of a multi-objective optimization procedure applicable to an arbitrary planar junction is presented. Such studies are important to high dimension to cool ions and achieve scaling in trapped-ion quantum information processor.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Radiation Detection Technology and Methods 2019年第3期3卷 236-246页

作者： H.Liu M.Benoit H.Chen K.Chen F.A.Di Bello G.Iacobucci F.Lanni M.Vicente Barreto Pinto w.wu L.Xu Physics Department Brookhaven National LaboratoryUptonNY11973USA Département de Physique Nucléaire et Corpusculaire(DPNC) Université de Genève24 quai Ernest Ansermet1211 Genève 4Switzerland

Background High-voltage CMOS is a promising technology for the pixel sensor of tracking detectors in the collider *** studies are being carried out by theATLASCollaboration to investigate the possibility of using theHV-CMOS technology in the HL-LHC upgrade of the ATLAS inner tracker *** The CaRIBOu(Control and Readout Itk BOards)is a modular test system developed to test the HV-CMOS pixel sensor prototypes and *** This test system consists of pixel sensor specific front-end chip boards,a control and readout board(CaR board),a central interface board and the back-end DAQ ***,two DAQ solutions are available for the CaRIBOu system,one is based on the FELIX(front-end link eXchange)readout system and the other is based on the Gigabit Ethernet *** Various testbeam experiments have been carried out with the CaRIBOu system since 2015 for the pixel sensors fabricated by the AMS HV-CMOS 180 nm and 350 nm *** The test results show that this test system is very flexible and could be adapted to the test of different pixel sensors with minimum effort,and the performance meets the testbeam requirements.

关键词： Particle tracking detectors Optical detector readout concepts Pixel sensor Testbeam

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

低成本化学驱油的设计与优选

石油石化节能 1997年第5期 1-8页

作者： w.wu A.vaskas M．Delshad 史权胜利油田勘探公司

在原油价格较低的情况下。化学驱油主要的问题是降低成本。在美国采用化学驱油方法提高原油产量的主要对象是轻质油油田。进行了与经济模型相结合使用模拟的结果来优选表面活性剂和聚合物化学驱油的设计。不同的表面活性剂浓度对工程效... 详细信息

在原油价格较低的情况下。化学驱油主要的问题是降低成本。在美国采用化学驱油方法提高原油产量的主要对象是轻质油油田。进行了与经济模型相结合使用模拟的结果来优选表面活性剂和聚合物化学驱油的设计。不同的表面活性剂浓度对工程效益有显著的影响。最理想的结果是聚合物和表面活性剂二者是低浓度并同时注进油层。有时选用低张力聚合物。设计的敏感性分析表明，最重要的经济变量是油价。折扣率。经营费用和化学制剂的价格。在敏感性分析中，也包括了不同聚合物的浓度，油田的实际渗透率和垂直与水平渗透率的比率。蒙特卡伦模拟就是用作对表面活性剂／聚合的注水风险评估的演示。结论表明，应用实际的油藏模拟与现代工艺技术（如水平井积最优化经济评价法，是能改进化学注水工程的设计。

关键词：化学驱油聚合物表面活性剂水平井渗透率

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

低成本化学驱油的设计与优选

国外油田工程 1997年第5期13卷 1-8页

作者： w.wu A.vaskas M.Delshad 史权胜利油田勘探公司

关键词：化学驱油聚合物表面活性剂采收率油田

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

用于未来一代VSAT通信网的先进卫星概念

成都信息工程学院学报 1993年第2期15卷 106-114页

作者： F.Michael Naderi william w.wu 刘志敏

引言在竞争着的电信环境里兴起的卫星工业需要进行技术革新,以便创造出比较尖端的卫星;并且需要进行联网和销售方面的革新,为提供独一无二的服务或者提供令人满意的卫星系统创造条件。在九十年代,采用天线口径非常小的地球站(VSAT)的... 详细信息

引言在竞争着的电信环境里兴起的卫星工业需要进行技术革新,以便创造出比较尖端的卫星;并且需要进行联网和销售方面的革新,为提供独一无二的服务或者提供令人满意的卫星系统创造条件。在九十年代,采用天线口径非常小的地球站(VSAT)的先进通信网将给卫星工业带来很多市场机遇;抓住这种机遇不但可以使该工业生存下去,而且可以走上发展、壮大的道路。

关键词： VSAT 波束天线通信网地球站星上交换天线口径上行链路发射功率频带宽度路由选择

Different analytical models and methods to study wave propagation across rock joints

在线全文

学校读者我要写书评

暂无评论

Different analytical models and methods to study wave propag...

ELECTRON FIELD EMISSION FROM SiC/Si HETEROSTRUCUTRES SYNTHESIZED BY CARBON IMPLANTATION USING A MEwA ION SOURCE

Harmonising Rock Engineering and the Environment—12th ISRM International Congress on Rock Mechanics

作者： J.B.Zhu w.wu & J.Zhao Laboratory for Rock Mechanics(LMR) Ecole Polytechnique Federale de Lausanne(EPFL) Lausanne Switzerland

＜正＞Rock Masses are different from other engineering materials by the existence of a great number of *** results in the discontinuous characteristics of rock masses,and greatly affect the properties of rock *** a wave propagates in jointed rock masses,it is both slowed and attenuated, mainly due to the existence of *** effects of rock joints on wave p ropagation are of fundamental interest in geophysics exploration,rock dynamics,earthquake seismology, and hydrocarbon production.

关键词： Dynamics blasting rock joints rock mass

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

ELECTRON FIELD EMISSION FROM SiC/Si HETEROSTRUCUTRES SYNTHES...