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浏览/检索结果: 共32条，第1-10条 帮助 条数/页： 5101520253035404550556065707580859095100 排序方式： 请选择题名升序题名降序提交时间升序提交时间降序作者升序作者降序发表日期升序发表日期降序 Middle and near ultraviolet spectrograph of the Scientific Experimental system in Near SpacE (SENSE) 期刊论文  OAI收割 Earth and Planetary Physics, 2023, 卷号: 7, 期号: 6, 页码: 655-664 作者:  Sun, Xin;  Shi, Dalian;  Chen, Zhen   |  收藏  |  浏览/下载：16/0  |  提交时间：2023/12/06 ultraviolet spectrograph  radiation background  imaging grating  intensified detector  low-pressure discharge  spectral calibration   Research on data processing method for detection of small and weak targets in space 会议论文  OAI收割 ELECTR NETWORK, 2022-11-24 作者:  Sen, Tian;  Yan, Wen   |  收藏  |  浏览/下载：15/0  |  提交时间：2023/06/19 the Milky Way's background  low signal to noise ratio  target detection  multiframe superposition   Low terahertz-band scanning near-field microscope with 155-nm resolution 期刊论文  OAI收割 ULTRAMICROSCOPY, 2021, 卷号: 226, 页码: 7 作者:  Dai, Guangbin;  Wang, Jie;  Zhang, Xiaoxuan;  Chang, Tianying;  Cui, Hong-Liang   |  收藏  |  浏览/下载：63/0  |  提交时间：2021/08/20 Low terahertz-band  Near-field  Background scattering  Antenna theory  Mixer demodulation   Gamma Spectrum Measurement Following the Nuclear Decay 期刊论文  OAI收割 Journal of Physics: Conference Series, 2021, 卷号: 1739 作者:  Shen,Shuifa;  Wang,Feipeng;  Yan,Yupeng;  Shen,Jiejie;  Li,Yan   |  收藏  |  浏览/下载：13/0  |  提交时间：2022/03/21 Low-background anti-Compton spectrometer  γ-γ-t coincidence system  β- and β++EC decays  γ-ray   Gamma Spectrum Measurement Following the Nuclear Decay 期刊论文  OAI收割 Journal of Physics: Conference Series, 2021, 卷号: 1739, 期号: 1 作者:  Shen,Shuifa;  Wang,Feipeng;  Yan,Yupeng;  Shen,Jiejie;  Li,Yan   |  收藏  |  浏览/下载：24/0  |  提交时间：2021/12/13 Low-background anti-Compton spectrometer  γ-γ-t coincidence system  β- and β++EC decays  γ-ray   A facility for direct measurements for nuclear astrophysics at IFIN-HH - a 3 MV tandem accelerator and an ultra-low background laboratory 期刊论文  OAI收割 NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 2020, 卷号: 953, 页码: 6 作者:  Tudor, D.;  Trache, L.;  Chilug, A., I;  Stefanescu, I. C.;  Spiridon, A.   |  收藏  |  浏览/下载：23/0  |  提交时间：2022/01/19 Nuclear physics for astrophysics  Direct measurements  Thick target method  Activation methods  Ultra-low background   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   |  收藏  |  浏览/下载：49/0  |  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.   Altered Static and Temporal Dynamic Amplitude of Low-Frequency Fluctuations in the Background Network During Working Memory States in Mild Cognitive Impairment 期刊论文  OAI收割 FRONTIERS IN AGING NEUROSCIENCE, 2019, 卷号: 11, 页码: 10 作者:  Wang, Pengyun;  Li, Rui;  Liu, Bei;  Wang, Cheng;  Huang, Zirui   |  收藏  |  浏览/下载：100/0  |  提交时间：2019/08/05 mild cognitive impairment  working memory  amplitude of low-frequency fluctuations  background network  temporal dynamics   Dim small targets detection based on statistical block low-rank background modeling 会议论文  OAI收割 Beijing, China, July 7, 2019 - July 9, 2019 作者:  Li, Biao;  Xu, Zhiyong;  Zhang, Jianlin;  Fan, Xiangsuo   |  收藏  |  浏览/下载：39/0  |  提交时间：2021/05/06 statistical block  low-rank background  targets detection  stationarity  principal component analysis  dim small targets  SBLR  background reconstruction   Background Reconstruction via Low Rank Tensor Factorization 会议论文  OAI收割 Chengdu, China, December 12-14, 2018 作者:  Zhang Y(张杨);  Tang YD(唐延东);  Chen XA(陈希爱);  Han Z(韩志);  Shen GP(沈贵萍)   |  收藏  |  浏览/下载：32/0  |  提交时间：2018/12/27 background reconstruction  low rank  Tensor factorization  MoG  MRF