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浏览/检索结果: 共118条，第1-10条 帮助

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Optimizing an Abundance-Based Model for Satellite Remote Sensing of Phytoplankton Size Classes in the Bohai and Yellow Seas of China 期刊论文  OAI收割
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING, 2024, 卷号: 62, 页码: 13
作者:  Wang, Yueqi;  Liu, Dongyan;  Wang, Yujue;  Gao, Meng;  Gao, Zhiqiang
  |  收藏  |  浏览/下载：15/0  |  提交时间：2024/05/23
Optimizing an Abundance-Based Model for Satellite Remote Sensing of Phytoplankton Size Classes in the Bohai and Yellow Seas of China 期刊论文  OAI收割
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING, 2024, 卷号: 62, 页码: 13
作者:  Wang, Yueqi;  Liu, Dongyan;  Wang, Yujue;  Gao, Meng;  Gao, Zhiqiang
  |  收藏  |  浏览/下载：11/0  |  提交时间：2024/05/23
Evidence for WW/WZ vector boson scattering in the decay channel $\ell\nu$qq produced in association with two jets in proton-proton collisions at $\sqrt{s} =$ 13 TeV 期刊论文  OAI收割
PHYSICS LETTERS B, 2022, 卷号: 834, 页码: 137438
作者:  CMS Collaboration
  |  收藏  |  浏览/下载：20/0  |  提交时间：2023/11/09
Nuclear modification of $\Upsilon$ states in pPb collisions at $\sqrt{s_\mathrm{NN}}$ = 5.02 TeV 期刊论文  OAI收割
PHYSICS LETTERS B, 2022, 卷号: 835, 页码: 137397
作者:  CMS Collaboration
  |  收藏  |  浏览/下载：16/0  |  提交时间：2023/11/09
Evidence of oblate-prolate shape coexistence in the strongly-deformed nucleus Cs-119 期刊论文  OAI收割
PHYSICS LETTERS B, 2021, 卷号: 822, 页码: 5
作者:  Zheng, K. K.;  Petrache, C. M.;  Zhang, Z. H.;  Zhao, P. W.
  |  收藏  |  浏览/下载：83/0  |  提交时间：2021/12/08
Additive hazard regression of event history studies with intermittently measured covariates 期刊论文  OAI收割
CANADIAN JOURNAL OF STATISTICS-REVUE CANADIENNE DE STATISTIQUE, 2021, 页码: 22
作者:  Sun, Xiaowei;  Song, Xinyuan;  Sun, Liuquan
  |  收藏  |  浏览/下载：22/0  |  提交时间：2021/10/26
Single-Pixel THz Imaging Based on Optimization of Collimated Spot 会议论文  OAI收割
Nis, Serbia, October 20-22, 2021
作者:  Jia, Zhiwei;  Qi F(祁峰);  Liu ZY(刘朝阳)
  |  收藏  |  浏览/下载：19/0  |  提交时间：2022/02/04
Detection of Flare Multiperiodic Pulsations in Mid-ultraviolet Balmer Continuum, Lyl Hard X-Ray, and Radio Emissions Simultaneously 期刊论文  OAI收割
The Astrophysical Journal, 2021, 卷号: 921, 页码: 179
作者:  HXMT
  |  收藏  |  浏览/下载：25/0  |  提交时间：2022/02/08
Solar flares  Solar oscillations  Solar ultraviolet emission  Solar  x-ray emission  Solar radio emission  1496  1515  1533  1536  1522  Astrophysics - Solar and Stellar Astrophysics  Abstract: Quasi-periodic pulsations (QPPs), which usually appear as temporal pulsations of the total flux, are frequently detected in the light curves of solar/stellar flares. In this study, we present the investigation of nonstationary QPPs with multiple periods during the impulsive phase of a powerful flare on 2017 September 6, which were simultaneously measured by the Hard X-ray Modulation Telescope (Insight-HXMT), as well as the ground-based BLENSW. The multiple periods, detected by applying a wavelet transform and Lomb-Scargle periodogram to the detrended light curves, are found to be ~20-55 s in the Ly`and mid-ultraviolet Balmer continuum emissions during the flare impulsive phase. Similar QPPs with multiple periods are also found in the hard X-ray emission and low-frequency radio emission. Our observations suggest that the flare QPPs could be related to nonthermal electrons accelerated by the repeated energy release process, i.e., triggering of repetitive magnetic reconnection, while the multiple periods might be modulated by the sausage oscillation of hot plasma loops. For the multiperiodic pulsations, other generation mechanisms could not be completely ruled out.  
The braking index of PSR B0540-69 and the associated pulsar wind nebula emission after spin-down rate transition 期刊论文  OAI收割
Monthly Notices of the Royal Astronomical Society, 2020, 卷号: 494, 页码: 1865-1870
作者:  HXMT
  |  收藏  |  浏览/下载：55/0  |  提交时间：2022/02/08
stars: magnetic field  stars: neutron  pulsars: general  Astrophysics  - High Energy Astrophysical Phenomena  Abstract: In 2011 December, PSR B054-69 experienced a spin-down rate transition (SRT), after which the spin-down power of the pulsar increased by $\sim 36{{\ \rm per\ cent}}$. About 1000 d after the SRT, the X-ray luminosity of the associated pulsar wind nebula (PWN) was found to brighten by $32\pm 8{{\ \rm per\ cent}}$. After the SRT, the braking index n of PSR B0540-69 changes from n = 2.12 to 0.03 and then keeps this value for about five years before rising to n = 0.9 in the following years. We find that most of the current models have difficulties in explaining the measured braking index. One exceptive model of the braking index evolution is the increasing dipole magnetic field of PSR B0540-69. We suggest that the field increase may result from some instabilities within the pulsar core that enhance the poloidal component at the price of toroidal component of the magnetic field. The increasing dipole magnetic field will result in the X-ray brightening of the PWN. We fit the PWN X-ray light curve by two models: one assumes a constant magnetic field within the PWN during the brightening and the other assumes an enhanced magnetic field proportional to the energy density of the PWN. It appears that the two models fit the data well, though the later model seems to fit the data a bit better. This provides marginal observational evidence that magnetic field in the PWN is generated by the termination shock. Future high-quality and high-cadence data are required to draw a solid conclusion.  
The Frequency-Domain Fusion Virtual Multi-Loop Feedback Control System with Measured Disturbance Feedforward Method in Telescopes 期刊论文  OAI收割
ELECTRONICS, 2019, 卷号: 8, 期号: 10
作者:  Mao, Yao;  Deng, Jiuqiang;  Zhou, Xi;  Ren, Wei
  |  收藏  |  浏览/下载：37/0  |  提交时间：2021/05/06