中国科学院机构知识库网格系统: 检索

Finite Element Error Estimation for Parabolic Optimal Control Problems with Pointwise Observations 期刊论文 OAI收割
NUMERICAL MATHEMATICS-THEORY METHODS AND APPLICATIONS, 2021, 页码: 35
作者: Liang, Dongdong; Gong, Wei; Xie, Xiaoping

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收藏 | 浏览/下载：35/0 | 提交时间：2022/04/02

Parabolic optimal control problem pointwise observation space-time finite element method parabolic PDE with Dirac measure error estimate

Oscillatory orbits in the restricted planar four body problem 期刊论文 OAI收割
Nonlinearity, 2020, 卷号: 33, 期号: 12
作者: Seara,Tere M; Zhang,Jianlu

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收藏 | 浏览/下载：24/0 | 提交时间：2021/01/14

restricted planar four body problem final motions oscillatory orbits parabolic orbits three body problem lambda lemma scattering map restricted planar four body problem final motions oscillatory orbits parabolic orbits three body problem lambda lemma scattering map primary 37N05 37D10 secondary 70F07 70H09

The nonconforming virtual element method for parabolic problems 期刊论文 OAI收割
APPLIED NUMERICAL MATHEMATICS, 2019, 卷号: 143, 页码: 97-111
作者: Zhao, Jikun; Zhang, Bei; Zhu, Xiaopeng

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收藏 | 浏览/下载：53/0 | 提交时间：2020/01/10

Nonconforming virtual element Parabolic problem Polygonal or polyhedral meshes

Finite Element Method and A Priori Error Estimates for Dirichlet Boundary Control Problems Governed by Parabolic PDEs 期刊论文 OAI收割
JOURNAL OF SCIENTIFIC COMPUTING, 2016, 卷号: 66, 期号: 3, 页码: 941-967
作者: Gong, Wei; Hinze, Michael; Zhou, Zhaojie

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收藏 | 浏览/下载：29/0 | 提交时间：2018/07/30

Optimal control problem Parabolic equation Finite element method A priori error estimate Dirichlet boundary control

FINITE ELEMENT APPROXIMATIONS OF PARABOLIC OPTIMAL CONTROL PROBLEMS WITH CONTROLS ACTING ON A LOWER DIMENSIONAL MANIFOLD 期刊论文 OAI收割
SIAM JOURNAL ON NUMERICAL ANALYSIS, 2016, 卷号: 54, 期号: 2, 页码: 1229-1262
作者: Gong, Wei; Yan, Ningning

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收藏 | 浏览/下载：19/0 | 提交时间：2018/07/30

finite element method parabolic equation optimal control problem moving manifold fully discrete error estimates

Study on spectrograph for ionosphere: A broadband imaging instrument prototype for far-ultraviolet (EI CONFERENCE) 会议论文 OAI收割
International Symposium on Photoelectronic Detection and Imaging 2011: Space Exploration Technologies and Applications, May 24, 2011 - May 26, 2011, Beijing, China
作者: Wang S.-R.; Lin G.-Y.; Yu L.

收藏 | 浏览/下载：35/0 | 提交时间：2013/03/25

Current research on space-based exploration for the ionosphere needs more advanced technologies. Because the spectral signals in the ionosphere distributing basically in the far-ultraviolet waveband are very weak. Usual spectrometer structures and detectors such as CCD can't receive enough information. Based on this principle of atmospheric sounding the imaging spectrometer prototype for ionosphere detection application was designed to solve the problem. This prototype consists of the telescope and the imaging spectrometer. The simple structure and small number of mirrors can help higher transmission efficiency be achieved and weak signals detection be implemented. The telescope is an off-axis parabolic mirror and the spectrometer is a modified Czerny-Turner spectral imaging system. Modified Czerny-Turner spectrometer contains a spherical mirror a fixed plane grating and a toroidal mirror. By adjusting the incident angle to the collimating mirror and using toroidal mirror coma and astigmatism were corrected well. We also optimize distances between the grating to the focusing mirror and the focusing mirror to the image plane to improve disadvantages of traditional Czerny-Turner structure. Designed results demonstrate that aberrations are substantially corrected and high image quality can be obtained in broad waveband. The photon counting Wedge-Strip-Anode detector with micro-channel planes as the receiving plane is accepted for the instrument prototype. The other photon counting 2-D detector responding well for weak light such as Cross-Delay line detector and MAMA detector can also be used for detection. The calibration and performances testing system is made of a vacuum system a deuterium lamp a monochrometer and the instrument prototype. Results obtained from the experiment show that the spectral resolution is 2.4 nm and the spatial resolution is 80 m. The other calibration experiments are running. The technology of the spectrometer prototype is important for the research and applications of ionosphere remote sensing. 2011 SPIE.

A low order nonconforming anisotropic finite element approximation to parabolic problem 期刊论文 OAI收割
JOURNAL OF SYSTEMS SCIENCE & COMPLEXITY, 2009, 卷号: 22, 期号: 3, 页码: 518-532
作者: Shi, Dongyang

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收藏 | 浏览/下载：11/0 | 提交时间：2018/07/30

Anisotropic meshes nonconforming element parabolic problem superclose superconvergence

Cascadic multigrid methods for parabolic problems 期刊论文 OAI收割
SCIENCE IN CHINA SERIES A-MATHEMATICS, 2008, 卷号: 51, 期号: 8, 页码: 1415-1439
作者: Du Qiang; Ming PingBing

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收藏 | 浏览/下载：22/0 | 提交时间：2018/07/30

cascadic multigrid method parabolic problem finite element methods backward Euler scheme smoother stability optimal error order optimal complexity

OPTIMIZED SCHWARZ METHODS WITH ROBIN TRANSMISSION CONDITIONS FOR PARABOLIC PROBLEMS 期刊论文 OAI收割
SIAM JOURNAL ON SCIENTIFIC COMPUTING, 2008, 卷号: 31, 期号: 1, 页码: 608-623
作者: Qin, Lizhen; Xu, Xuejun

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收藏 | 浏览/下载：23/0 | 提交时间：2018/07/30

parabolic problem nonconforming finite elements nonoverlapping domain decomposition Robin transmission condition convergence rate optimal parameter

Schwarz alternating method based on natural boundary reduction for time-dependent problems on unbounded domains 期刊论文 OAI收割
COMMUNICATIONS IN NUMERICAL METHODS IN ENGINEERING, 2004, 卷号: 20, 期号: 5, 页码: 363-378
作者: Du, QK; Yu, DH

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收藏 | 浏览/下载：15/0 | 提交时间：2018/07/30

time-dependent problem parabolic partial differential equations natural boundary reduction domain decomposition two-dimensional exterior problem Schwarz alternating method