机构

• 数学与系统科学研究院 [2]
• 长春光学精密机械与物... [1]
• 过程工程研究所 [1]
• 工程热物理研究所 [1]

采集方式

• OAI收割 [5]

内容类型

• 期刊论文 [4]
• 会议论文 [1]

发表日期

• 2021 [1]
• 2019 [1]
• 2015 [1]
• 2006 [1]
• 1998 [1]

学科主题

筛选

浏览/检索结果: 共5条，第1-5条 帮助 条数/页： 5101520253035404550556065707580859095100 排序方式： 请选择题名升序题名降序发表日期升序发表日期降序提交时间升序提交时间降序作者升序作者降序 DEM simulation of standpipes under the negative pressure gradient 期刊论文  OAI收割 CHEMICAL ENGINEERING SCIENCE, 2021, 卷号: 246, 页码: 11 作者:  Liu, Qi   |  收藏  |  浏览/下载：49/0  |  提交时间：2022/06/15 Discrete Element Method (DEM)  Negative pressure gradient  Standpipe  Moving bed  Equivalent gravity   Energy-preserving algorithm for gyrocenter dynamics of charged particles 期刊论文  OAI收割 NUMERICAL ALGORITHMS, 2019, 卷号: 81, 期号: 4, 页码: 1521-1530 作者:  Zhang, Ruili;  Liu, Jian;  Qin, Hong;  Tang, Yifa   |  收藏  |  浏览/下载：72/0  |  提交时间：2020/01/10 Energy-preserving algorithm  Gyrocenter system  Discrete gradient method   Convergence analysis on multigrid methods for elliptic problems with large jumps in coefficients 期刊论文  OAI收割 IMA JOURNAL OF NUMERICAL ANALYSIS, 2015, 卷号: 35, 期号: 4, 页码: 1888-1912 作者:     |  收藏  |  浏览/下载：22/0  |  提交时间：2018/07/30 multigrid method  jump coefficient problem  discrete harmonic extension  nearly singular problem  preconditioned conjugate gradient method   A new segmentation method of CR images based on discrete wavelet transform and mathematics morphology (EI CONFERENCE) 会议论文  OAI收割 ICO20: Optical Information Processing, August 21, 2005 - August 26, 2005, Changchun, China 作者:  Li Z.;  Li Z. 收藏  |  浏览/下载：71/0  |  提交时间：2013/03/25 In this paper  we propose a segmentation method of CR(computed radiography) images with being rid of under-segmentation and over-segmentation. An under-segmentation occurs when pixels belonging to different objects are grouped into a single region. Such errors are the most dangerous because they can invalidate the whole segmentation process. The phenomenon always takes place when we segment CR images because of the principle of CR. In order to depressed under-segmentation  we enhance the CR images using DWT (discrete wavelet transform) to get more detail of CR image features. As we enhance the CR image  the over-segmentation maybe occurs. Compared with under-segmentation  the over-segmentation occurs when a single objects is subdivided by segmentation into several region. For the purpose of preventing from the over-segmentation  we present a scheme for enhanced CR images based on watershed algorithm that solves over-segmentation problem. We use marker-based watershed algorithm. Together with gradient image and marker image  watershed segmentation can make sure to partition CR image into meaningful object and avoid further segmentation of homogeneous regions. The result of the proposed algorithm are compared with those of other standard methods. Experiments have shown a better result and indeed solved under-segmentation and over-segmentation problems.   Inverse Radiation Problem of Boundary Incident Radiation Heat Flux in Semitransparent Planar Slab with Semitransparent Boundaries 期刊论文  OAI收割 JOURNAL OF THERMAL SCIENCE, 1998, 卷号: 7, 期号: 2, 页码: 131138 Liu Linhua; Tan Heping; Yu Qizheng 收藏  |  浏览/下载：14/0  |  提交时间：2013/03/12 inverse radiative problem  radiation heat flux  discrete ordinates method  conjugate gradient method.