中国科学院机构知识库网格系统: 检索

A two-level nested model for extracting positive and negative terrains combining morphology and visualization indicators 期刊论文 OAI收割
ECOLOGICAL INDICATORS, 2020, 卷号: 109, 页码: 14
作者: Li, Jingxin; Zhang, Hongqi; Xu, Erqi

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收藏 | 浏览/下载：47/0 | 提交时间：2020/05/19

Positive and negative terrains Visualization indicators Two-level nested model Optimum threshold selection Accuracy assessment Slope land

A two-level nested model for extracting positive and negative terrains combining morphology and visualization indicators 期刊论文 OAI收割
ECOLOGICAL INDICATORS, 2020, 卷号: 109, 页码: 14
作者: Li, Jingxin; Zhang, Hongqi; Xu, Erqi

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收藏 | 浏览/下载：45/0 | 提交时间：2020/05/19

Positive and negative terrains Visualization indicators Two-level nested model Optimum threshold selection Accuracy assessment Slope land

Comparison of simulated backgrounds with in-orbit observations for HE, ME, and LE onboard Insight-HXMT 期刊论文 OAI收割
Astrophysics and Space Science, 2020, 卷号: 365, 页码: 158
作者: HXMT

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收藏 | 浏览/下载：76/0 | 提交时间：2022/02/08

Insight-HXMT Geant4 simulation Background observation Astrophysics - Instrumentation and Methods for Astrophysics Abstract: Insight-HXMT, the first X-ray astronomical satellite in China, aims to reveal new sources in the Galaxy and to study fundamental physics of X-ray binaries from 1 to 250 keV. It has three collimated telescopes, the High Energy X-ray telescope (HE), the Medium Energy X-ray telescope (ME), and the Low Energy X-ray telescope (LE). Before the launch, in-orbit backgrounds of these three telescopes had been estimated through Geant4 simulation, in order to investigate the instrument performance and the achievement of scientific goals. In this work, these simulated backgrounds are compared with in-orbit observations. Good agreements are shown for all three telescopes. For HE, (1) the deviation of the simulated background rate after two years of operation in space is 5 % from the observation (2) the total background spectrum and the relative abundance of the 67 keV line show long-term increases both in simulations and observations. For ME, (1) the deviation of simulated background rate is within 15 % from the observation, and (2) there are no obvious long-term increase features in the background spectra of simulations and observations. For LE, the background level given by simulations is also consistent with observations. The consistencies of these comparisons validate that the Insight-HXMT mass model, i.e., space environment components and models adopted, physics processes selected, and detector constructions built, is reasonable. However, the line features at 7.5 and 8.0 keV, which are obvious in the observed spectra of LE, are not evident in simulations. This might result from uncertainties in the LE constructions.

Local difference-based active contour model for medical image segmentation and bias correction 期刊论文 OAI收割
IET Image Processing, 2019, 卷号: 13, 期号: 10, 页码: 1755-1762
作者: Niu, Yuefeng; Cao, Jianzhong

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收藏 | 浏览/下载：90/0 | 提交时间：2019/09/25

image segmentation medical image processing two-phase model medical images LBDE model precise segmentation results comparative models local difference-based active contour model medical image segmentation bias correction local bias field difference estimation model smooth orthogonal basis functions clustering criterion function measured image local region accurate segmentation results level set evolution process

Local difference-based active contour model for medical image segmentation and bias correction 期刊论文 OAI收割
IET IMAGE PROCESSING, 2019, 卷号: 13, 期号: 10, 页码: 1755-1762
作者: Niu, Yuefeng; Cao, Jianzhong

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收藏 | 浏览/下载：48/0 | 提交时间：2020/06/05

image segmentation medical image processing two-phase model medical images LBDE model precise segmentation results comparative models local difference-based active contour model medical image segmentation bias correction local bias field difference estimation model smooth orthogonal basis functions clustering criterion function measured image local region accurate segmentation results level set evolution process

Leg-By-Leg-Based Finite-Control-Set Model Predictive Control for Two-Level Voltage-Source Inverters 期刊论文 OAI收割
JOURNAL OF POWER ELECTRONICS, 2019, 卷号: 19, 期号: 5, 页码: 1162-1170
作者: Zhang, Tao; Lang, Zhengying; Qi C(齐琛); Chen XY(陈希有)

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收藏 | 浏览/下载：82/0 | 提交时间：2019/10/10

Current control Model predictive control Two-level voltage-source inverter

A two-level parallelization method for distributed hydrological models SCI/SSCI论文 OAI收割
2016
作者: Liu J. Z.; Zhu, A. X.; Qin, C. Z.; Wu, H.; Jiang, J. C.

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收藏 | 浏览/下载：61/0 | 提交时间：2017/11/09

Distributed hydrological model Two-level parallelization Multi-core cluster Sub-basin Basic simulation unit spatial discretization river-basins simulation

High-harmonic generation by intense laser fields interacting with atoms in three dimensional and two-level hydrogen atom model 期刊论文 OAI收割
HIGH ENERGY PHYSICS AND NUCLEAR PHYSICS-CHINESE EDITION, 2006, 卷号: 30, 页码: 1137-1140
作者: Lu He-Lin; Wang Shun-Jin

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收藏 | 浏览/下载：24/0 | 提交时间：2018/05/31

3-dimensional two-level hydrogen model time-dependent Schrodinger equation high-order harmonics

Long baroclinic Rossby waves with periods of about 500 d near 20 N in the northwest Pacific Ocean 期刊论文 OAI收割
ACTA OCEANOLOGICA SINICA, 2006, 卷号: 25, 期号: 3, 页码: 1-10
作者: Chen Haiying; Qiao Fangli; Fang Guohong; Wang Yonggang; Wei Zexun

收藏 | 浏览/下载：40/0 | 提交时间：2015/07/19

low frequency oscillation Rossby waves maps of sea level anomalies northwest Pacific Ocean two-layer model

Long baroclinic rossby waves with periods of about 500 d near 20 n in the northwest pacific ocean 期刊论文 iSwitch采集
Acta oceanologica sinica, 2006, 卷号: 25, 期号: 3, 页码: 1-10
作者: Chen Haiying; Qiao Fangli; Fang Guohong; Wang Yonggang; Wei Zexun

收藏 | 浏览/下载：40/0 | 提交时间：2019/05/10

Low frequency oscillation Rossby waves Maps of sea level anomalies Northwest pacific ocean Two-layer model