检索结果-南通市图书馆

An Indirect-Forcing Immersed Boundary Method for Incompressible Viscous Flows with Interfaces on Irregular Domains

Communications in Computational Physics 2009年第10期6卷 997-1021页

作者： Zhijun Tan K.M.Lim B.C.Khoo Desheng Wang singapore-mit alliance 4 Engineering Drive 3National University of SingaporeSingapore 117576Singapore Department of Mechanical Engineering National University of Singapore10 Kent Ridge CrescentSingapore 119260Singapore Division of Mathematical Sciences School of Physical and Mathematical SciencesNanyang Technological UniversitySingapore 637371Singapore

An indirect-forcing immersed boundary method for solving the incompressible Navier-Stokes equations involving the interfaces and irregular domains is *** rigid boundaries and interfaces are represented by a number of Lagrangian control *** rigid boundaries are embedded in the Cartesian grid and singular forces at the rigid boundaries are applied to impose the prescribed velocity *** singular forces at the interfaces and the rigid boundaries are then distributed to the nearby Cartesian grid points using the immersed boundary *** the present work,the singular forces at the rigid boundaries are computed implicitly by solving a small system of equations at each time step to ensure that the prescribed velocity condition at the rigid boundary is satisfied *** deformable interfaces,the forces that the interface exerts on the fluid are computed from the configuration of the elastic interface and are applied to the *** Navier-Stokes equations are discretized using finite difference method on a staggered uniform Cartesian grid by a second order accurate projection *** ability of the method to simulate viscous flows with interfaces on irregular domains is demonstrated by applying to the rotational flow problem,the relaxation of an elastic membrane and flow in a constriction with an immersed elastic membrane.

关键词： Incompressible Navier-Stokes equation fast Poisson solvers immersed boundary method projection method Cartesian grid irregular domain finite difference methods

来源：

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

An Implementation ofMAC Grid-Based IIM-Stokes Solver for Incompressible Two-Phase Flows

引用

Communications in Computational Physics 2011年第10期10卷 1333-1362页

作者： Zhijun Tan K.M.Lim B.C.Khoo Guangdong Province Key Laboratory of Computational Science and School of Mathematics and Computational Science Sun Yat-sen UniversityGuangzhou 510275China singapore-mit alliance 4 Engineering Drive 3National University of SingaporeSingapore 117576Singapore Department ofMechanical Engineering National University of Singapore10 Kent Ridge CrescentSingapore 119260Singapore

*** this paper,a novel implementation of immersed interface method combined with Stokes solver on a MAC staggered grid for solving the steady two-fluid Stokes equations with *** velocity components along the interface are introduced as two augmented variables and the resulting augmented equation is then solved by the GMRES *** augmented variables and/or the forces are related to the jumps in pressure and the jumps in the derivatives of both pressure and velocity,and are interpolated using cubic splines and are then applied to the fluid through the jump *** Stokes equations are discretized on a staggered Cartesian grid via a second order finite difference method and solved by the conjugate gradient *** numerical results show that the overall scheme is second order *** major advantages of the present IIM-Stokes solver are the efficiency and flexibility in terms of types of fluid flow and different boundary *** proposed method avoids solution of the pressure Poisson equation,and comparisons are made to show the advantages of time savings by the present *** generalized two-phase Stokes solver with correction terms has also been applied to incompressible two-phase Navier-Stokes flow.

关键词： Incompressible two-phase Stokes equations two-phaseNavier-Stokes equations discontinuous viscosity singular force immersed interface method Uzawa method front tracking method.

来源：

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

Biomass-Derived Porous Carbon-Based Nanostructures for Microwave Absorption

引用

Nano-Micro Letters 2019年第2期11卷 81-97页

作者： Huanqin Zhao Yan Cheng Wei Liu Lieji Yang Baoshan Zhang Luyuan Paul Wang Guangbin Ji Zhichuan J.Xu College of Materials Science and technology Nanjing University of Aeronautics and AstronauticsNanjing 210016People’s Republic of China School of Electronic Science and Engineering Nanjing UniversityNanjing 210093People’s Republic of China School of Materials Sciences and Engineering Nanyang Technological University50 Nanyang AvenueSingapore 639798Singapore singapore-HUJ alliance for research and Enterprise NEW-CREATE Phase IICampus for Research Excellence and Technological Enterprise(CREATE)Singapore 138602Singapore

Currently,electromagnetic(EM) pollution poses severe complication toward the operation of electronic devices and biological *** this end,it is pertinent to develop novel microwave absorbers through compositional and structural *** carbon(PC)materials demonstrate great potential in EM wave absorption due to their ultralow density,large surface area,and excellent dielectric loss ***,the large-scale production of PC materials through low-cost and simple synthetic route is a *** PC materials through biomass sources is a sustainable,ubiquitous,and low-cost method,which comes with many desired features,such as hierarchical texture,periodic pattern,and some unique *** the bio-inspired microstructure to manufacture PC materials in mild condition is *** this review,we summarize the EM wave absorption application of biomass-derived PC materials from optimizing structureand designing *** corresponding synthetic mechanisms and development prospects are discussed as *** perspective in this field is given at the end of the article.

关键词： Biomass resource Porous carbon Microwave absorption

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Selective Smoothed Finite Element Method

引用

Tsinghua Science and technology 2007年第5期12卷 497-508页

作者： T. T. Nauven G. R. Liu K. Y. Dai K. Y. Lam Center for Advanced Computations in Engineering Science Department of Mechanical Engineering National University of Singapore 9 Engineering Drive 1 Singapore 117576 Singapore singapore-mit alliance (SMA) E4-04-10 4 Engineering Drive 3 Singapore 117576 Singapore School of Mechanical and Aerospace Engineering Nanyang Technological University 50 Nanyang Avenue Singapore 639798 Singapore

The paper examines three selective schemes for the smoothed finite element method （SFEM） which was formulated by incorporating a cell-wise strain smoothing operation into the standard compatible finite element method （FEM）. These selective SFEM schemes were formulated based on three selective integration FEM schemes with similar properties found between the number of smoothing cells in the SFEM and the number of Gaussian integration points in the FEM. Both scheme 1 and scheme 2 are free of nearly incompressible locking, but scheme 2 is more general and gives better results than scheme 1. In addition, scheme 2 can be applied to anisotropic and nonlinear situations, while scheme 1 can only be applied to isotropic and linear situations. Scheme 3 is free of shear locking. This scheme can be applied to plate and shell problems. Results of the numerical study show that the selective SFEM schemes give more accurate results than the FEM schemes.

关键词： finite element method (FEM) smoothed finite element method (SFEM) strain smoothing smoothing cell selective

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Mechanopathology of red blood cell diseases—Why mechanics matters

引用

Theoretical & Applied Mechanics Letters 2011年第1期1卷 1-6页

作者： Chwee Teck Lim Mechanobiology Institute National University of Singapore Division of Bioengineering and Department of Mechanical Engineering National University of Singapore singapore-mit alliance for research & technology(SMART)

During the onset of a disease a cell may experience alterations in both the composition and organization of its cellular and molecular *** alterations may eventually lead to changes in its geometrical and mechanical properties such as cell size and shape,deformability and *** such,knowing how diseased cells respond to mechanical forces can reveal ways by which they differ from healthy ***,we will present biomechanistic insights into red blood cell related diseases that manifest mechanical property changes and how they directly contribute to the pathophysiology of *** conducting cell and molecular mechanics studies,not only can we elucidate changes in the structure-property-function relationship of diseased cells,we can also exploit the new knowledge gained to develop biomechanics based devices that may better detect and diagnose these diseases as well as help identify important biomechanical targets for possible therapeutic interventions.

关键词： human diseases pathophysiology cell mechanics single molecule biomechanics

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Spectral control of nonclassical light pulses using an integrated thin-film lithium niobate modulator

引用

Light(Science & Applications) 2022年第12期11卷 2922-2930页

作者： Di Zhu Changchen Chen Mengjie Yu Linbo Shao Yaowen Hu CJXin Matthew Yeh Soumya Ghosh Lingyan He Christian Reimer Neil Sinclair Franco N.C.Wong Mian Zhang Marko Loncar John A.Paulson School of Engineering and Applied Sciences Harvard UniversityCambridgeMA 02138USA Institute of Materials research and Engineering Agency for ScienceTechnology and Research(A*STAR)Singapore 138634Singapore research Laboratory of Electronics Massachusetts Institute of TechnologyCambridgeMA 02139USA HyperLight Corporation 1 Bow StreetSuite 420CambridgeMA 02139USA Division of Physics Mathematics and Astronomyand Alliance for Quantum Technologies(AQT)California Institute of TechnologyPasadenaCA 91125USA

Manipulating the frequency and bandwidth of nonclassical light is essential for implementing frequency-encoded/multiplexed quantum computation,communication,and networking protocols,and for bridging spectral mismatch among various quantum ***,quantum spectral control requires a strong nonlinearity mediated by light,microwave,or acoustics,which is challenging to realize with high efficiency,low noise,and on an integrated ***,we demonstrate both frequency shifting and bandwidth compression of heralded single-photon pulses using an integrated thin-film lithium niobate(TFLN)phase *** achieve record-high electro-optic frequency shearing of telecom single photons over terahertz range(±641 GHz or±5.2 nm),enabling high visibility quantum interference between frequency-nondegenerate photon *** further operate the modulator as a time lens and demonstrate over eighteen-fold(6.55 nm to 0.35 nm)bandwidth compression of single *** results showcase the viability and promise of on-chip quantum spectral control for scalable photonic quantum information processing.

关键词： quantum lithium film

来源：

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

Simulations of Compressible Two-Medium Flow by Runge-Kutta Discontinuous Galerkin Methods with the Ghost Fluid Method

引用

Communications in Computational Physics 2008年第2期3卷 479-504页

作者： Jianxian Qiu Tiegang Liu Boo Cheong Khoo Department of Mathematics Nanjing UniversityNanjingJiangsu 210093China Institute of High Performance Computing ♯01−01 The CapricornSingapore Science Park IISingapore 117528Singapore Department of Mathematics Beijing University of Aeronautics and AstronauticsBeijingChina Department of Mechanical Engineering National University of SingaporeSingapore 119260Singapore./Singapore-MIT Alliance4 Engineering Drive 3National University of SingaporeSingapore 117576Singapore.

The original ghost fluid method (GFM) developed in [13] and the modifiedGFM (MGFM) in [26] have provided a simple and yet flexible way to treat twomediumflow problems. The original GFM and MGFM make the material interface"invisible" during computations and the calculations are carried out as for a singlemedium such that its extension to multi-dimensions becomes fairly *** Runge-Kutta discontinuous Galerkin (RKDG) method for solving hyperbolic conservationlaws is a high order accurate finite element method employing the usefulfeatures from high resolution finite volume schemes, such as the exact or approximateRiemann solvers, TVD Runge-Kutta time discretizations, and limiters. In this paper,we investigate using RKDG finite element methods for two-medium flow simulationsin one and two dimensions in which the moving material interfaces is treated via nonconservativemethods based on the original GFM and MGFM. Numerical results forboth gas-gas and gas-water flows are provided to show the characteristic behaviors ofthese combinations.

关键词： Runge-Kutta discontinuous Galerkin method WENO scheme ghost fluid method approximate Riemann problem solver.

来源：

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

熵受限在纳流控生物分子分离系统中的应用(英文)

引用

光学精密工程 2009年第6期17卷 1403-1408页

作者： LI Zi- rui LIU Gui- rong HAN Jongyoon WANG Jian-sheng CHEN Yu-zong . The singapore-mit alliance (SMA) Singapore 117576 Department of Mechanical Engineering National University of Singapore Singapore 117576 Massachusetts Institute of technology Cambridge Massachusetts 02139 USA Department of Physics National University of Singapore Singapore 117542 Department of Pharmacy National University of Singapore Singapore 117543

提出了生物分子在深度周期性变化纳米流控通道中输运的理论模型。该系统利用不同大小的非各向同性粒子处在两个平面组成的狭小空间时转动自由度受限制程度(熵受限)的不同来实现带电粒子的分离。基于一维简化模型,建立了有效迁移率与通... 详细信息

提出了生物分子在深度周期性变化纳米流控通道中输运的理论模型。该系统利用不同大小的非各向同性粒子处在两个平面组成的狭小空间时转动自由度受限制程度(熵受限)的不同来实现带电粒子的分离。基于一维简化模型,建立了有效迁移率与通道尺寸、分子大小以及外电场强度的关系的解析解,用于表明这些因素如何决定分子分离的效果。算例表明对于50,150和300bp的DNA片段,在低电场强度下,迁移率误差值在5 %以下。该简化模型可用于分析和优化实际的纳滤分离系统,而无需做复杂的数值模拟,省去了大量的物理实验过程。

关键词： DNA 电泳分离技术纳流系统熵受限生物分子分离生物芯片

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Perovskite-transition metal dichalcogenides heterostructures: recent advances and future perspectives

引用

Opto-Electronic Science 2022年第8期1卷 1-40页

作者： Ahmed Elbanna Ksenia Chaykun Yulia Lekina Yuanda Liu Benny Febriansyah Shuzhou Li Jisheng Pan Ze Xiang Shen Jinghua Teng Institute of Materials research and Engineering Agency for ScienceTechnology and Research(A*STAR)2 Fusionopolis WaySingapore 138634Singapore Division of Physics and Applied Physics School of Physical and Mathematical SciencesNanyang Technological University50 Nanyang AvenueSingapore 637371Singapore Interdisciplinary Graduate Program Energy Research Institute@NTUNanyang Technological University50 Nanyang AvenueSingapore 639798Singapore The Photonics Institute and Center for Disruptive Photonic Technologies Nanyang Technological University50 Nanyang AvenueSingapore 639798 Singapore School of Materials Science and Engineering Nanyang Technological University50 Nanyang AvenueSingapore 639798Singapore Berkeley Educational alliance for research in singapore(BEARS) Ltd.1 CREATE WaySingapore 138602Singapore.

Transition metal dichalcogenides(TMDs)and perovskites are among the most attractive and widely investigated semiconductors in the recent *** are promising materials for various applications,such as photodetection,solar energy harvesting,light emission,and many *** these materials to form heterostructures can enrich the already fascinating properties and bring up new phenomena and *** in this field is growing rapidly in both fundamental studies and device ***,we review the recent findings in the perovskite-TMD heterostructures and give our perspectives on the future development of this promising *** fundamental properties of the perovskites,TMDs,and their heterostructures are discussed first,followed by a summary of the synthesis methods of the perovskites and TMDs and the approaches to obtain high-quality *** attention is paid to the TMD-perovskite heterostructures that have been applied in solar cells and photodetectors with notable performance *** through our analysis,we propose an outline on further fundamental studies and the promising applications of perovskite-TMD heterostructures.

关键词： transition metal dichalcogenides perovskites heterostructures photodetectors solar cells 2D materials

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A Modified Gravity p-Median Model for Optimizing Facility Locations

引用

Journal of Systems Science and Information 2018年第5期9卷 421-434页

作者： Zhuolin TAO Qingjing ZHENG Hui KONG College of Urban and Environmental Sciences Peking University School of Urban Planning and Design Peking University Shenzhen Graduate School China Academy of Urban Planning and Design singapore-mit alliance for research and technology Center

The gravity p-median model is an important improvement to the widely-used p-median model. However, there is still a debate on its validity in empirical applications. Previous studies even doubt the significance of the gravity p-median model. Using a case study of tertiary hospitals in Shenzhen, China, this study re-examines the difference between the gravity p-median model with the p-median model, by decomposing the difference between the two models into gravity rule and variant attraction. This study also proposes a modified gravity p-median model by incorporating a distance threshold. The empirical results support the validity of the gravity p-median model, and also reveal that only when the attractions of candidate facility locations are variable will the gravity p-median model lead to different results with the p-median model. The difference between the modified gravity p-median model and the gravity p-median model is also examined. Moreover, the impacts of the distance-decay parameter and distance threshold on solutions are investigated. Results indicate that a larger distance-decay parameter tends to result in a more dispersed distribution of optimal facilities and a smaller average travel time, and a smaller distance threshold can better promote the spatial equity of facilities. The proposed method can also be applied in studies of other types of facilities or in other areas.

关键词： location-allocation spatial optimization gravity p-median distance threshold Shenzhen

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：