中国科学院机构知识库网格系统: 检索

The origin of the photospheric emission of GRB 220426A 期刊论文 OAI收割
Monthly Notices of the Royal Astronomical Society, 2022, 卷号: 517, 期号: 2, 页码: 2088-2102
作者: Song, Xin-Ying; Zhang, Shuang-Nan; Ge, Ming-Yu; Zhang, Shu

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收藏 | 浏览/下载：20/0 | 提交时间：2023/11/10

gamma-ray burst: individual radiation mechanisms: thermal radiative transfer scattering Astrophysics - High Energy Astrophysical Phenomena

An underlying clock in the extreme flip-flop state transitions of the black hole transient Swift J1658.2-4242 期刊论文 OAI收割
Astronomy and Astrophysics, 2020, 卷号: 641, 页码: A101
作者: HXMT

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收藏 | 浏览/下载：61/0 | 提交时间：2022/02/08

accretion accretion disks black hole physics X-rays: binaries time Astrophysics - High Energy Astrophysical Phenomena Abstract:
Aims: Flip-flops are top-hat-like X-ray flux variations, which have been observed in some transient accreting black hole binary systems, and feature simultaneous changes in the spectral hardness and the power density spectrum (PDS). They occur at a crucial time in the evolution of these systems, when the accretion disc emission starts to dominate over coronal emission. Flip-flops remain a poorly understood phenomenon, so we aim to thoroughly investigate them in a system featuring several such transitions.
Methods: Within the multitude of observations of Swift J1658.2-4242 during its outburst in early 2018, we detected 15 flip-flops, enabling a detailed analysis of their individual properties and the differences between them. We present observations by XMM-Newton, NuSTAR, Astrosat, Swift, Insight-HXMT, INTEGRAL, and ATCA. We analysed their light curves, searched for periodicities, computed their PDSs, and fitted their X-ray spectra, to investigate the source behaviour during flip-flop transitions and how the interval featuring flip-flops differs from the rest of the outburst.
Results: The flip-flops of Swift J1658.2-4242 are of an extreme variety, exhibiting flux differences of up to 77% within 100 s, which is much larger than what has been seen previously. We observed radical changes in the PDS simultaneous with the sharp flux variations, featuring transitions between the quasi-periodic oscillation types C and A, which have never been observed before. Changes in the PDS are delayed, but more rapid than changes in the light curve. Flip-flops occur in two intervals within the outburst, separated by about two weeks in which these phenomena were not seen. Transitions between the two flip-flop states occurred at random integer multiples of a fundamental period of 2.761 ks in the first interval and 2.61 ks in the second. Spectral analysis reveals the high and low flux flip-flop states to be very similar, but distinct from intervals lacking flip-flops. A change of the inner temperature of the accretion disc is responsible for most of the flux difference in the flip-flops. We also highlight the importance of correcting for the influence of the dust scattering halo on the X-ray spectra.

Nickel sulfide anchored carbon nanotubes for all-solid-state lithium batteries with enhanced rate capability and cycling stability 期刊论文 OAI收割
JOURNAL OF MATERIALS CHEMISTRY A, 2018, 卷号: 6, 期号: 25, 页码: 12098-12105
作者: Peng, Gang; Mwizerwa, Jean Pierre; Wan, Hongli; Cai, Liangting; Xu, Xiaoxiong

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收藏 | 浏览/下载：53/0 | 提交时间：2018/12/04

Resonant Raman-scattering Rechargeable Lithium Secondary Batteries Electrochemical Performance Superionic Conductor Cathode Materials High-energy Electrodes Supercapacitors Nanocomposites

Atomic pair distribution function method development at the Shanghai Synchrotron Radiation Facility 期刊论文 OAI收割
CHINESE PHYSICS B中国物理. B, 2017, 卷号: 26, 期号: 7, 页码: 76101
作者: Tao, JZ; Guo, H; Lin, H; Zhou XJ(周晓娟); Tao JZ(陶举洲)

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收藏 | 浏览/下载：22/0 | 提交时间：2019/08/27

atomic pair distribution function x-ray scattering local structure high energy x-ray

Confined martensitic phase transformation kinetics and lattice dynamics in Ni-Co-Fe-Ga shape memory alloys 期刊论文 OAI收割
ACTA MATERIALIA, 2016, 卷号: 110, 页码: 200-206
Cong, Daoyong; Rule, Kirrily Clair; Li, Wen-Hsien; Lee, Chi-Hung; Zhang, Qinghua; Wang, Haoliang; Hao, Yulin; Wang, Yandong; Huang, E-Wen

收藏 | 浏览/下载：44/0 | 提交时间：2016/08/22

Shape memory alloy Martensitic transformation In-situ neutron diffraction Inelastic neutron scattering High-energy X-ray diffraction

First-principles study of Ti(3)AC(2) (A = Si, Al) (001) surfaces 期刊论文 OAI收割
Acta Materialia, 2007, 卷号: 55, 期号: 14, 页码: 4645-4655
H. Z. Zhang; S. Q. Wang

收藏 | 浏览/下载：25/0 | 提交时间：2012/04/13

ceramic Ti3SiC2 DFT surface energy surface stability ion-scattering spectroscopy ti3sic2 thin-films ab-initio mechanical-properties high-temperature oxidation resistance electronic-structure elastic properties solid-solution interfaces

High energy (p)over-barp and pp elastic scatterings in QCD inspired model 期刊论文 OAI收割
COMMUNICATIONS IN THEORETICAL PHYSICS, 2007, 卷号: 47, 期号: 4, 页码: 715-718
作者: Lu, J; Ma WX(马维兴); Ma, WX; He, XR

收藏 | 浏览/下载：27/0 | 提交时间：2016/06/28

QCD inspired model eikonal profile function high-energy elastic scattering

High Energy (-p)p and pp Elastic Scatterings in QCD Inspired Model 期刊论文 OAI收割
理论物理通讯(英文版), 2007, 期号: 11, 页码: 715-718
作者: LU Juan; Ma WX(马维兴); HE Xiao-Rong

收藏 | 浏览/下载：16/0 | 提交时间：2015/12/10

QCD inspired model eikonal profile function high-energy elastic scattering

Excitonic properties of vertically aligned ZnO nanotubes under high-density excitation (EI CONFERENCE) 会议论文 OAI收割
Lu Y. M.; Liang H. W.; Shen D. Z.; Zhang Z. Z.; Zhang J. Y.; Zhao D. X.; Liu Y. C.; Fan X. W.

收藏 | 浏览/下载：13/0 | 提交时间：2013/03/25

In this paper highly oriented and vertically arranged ZnO nanotubes are prepared on Al2O3 (0 0 0 1) substrate without employing any metal catalysts by plasma-assisted molecular beam epitaxy. The photoluminescence (PL) spectra at room temperature are studied under high excitation densities. Under lower excitation density (60 kW/cm2) PL spectrum shows that one strong free exciton emission (FE) locates at 3.306 eV. As the excitation density increases up to 200 kW/cm2 a new emission peak (Pn) located at low-energy side of FE is attributed to the spontaneous emission due to an exciton-exciton (Ex-E x) scattering process from two ground state excitons where one exciton is recombined by emitting a photon and the other is scattered into the excited states of n=2 3 4.... Under excitation density of 300 kW/cm 2 the stimulated emission originating from Ex-E x scattering is obtained. When the excitation density is above 580 kW/cm2 the emission from electron-hole plasma is observed in low-energy side of the P band and indicates a typical superradiation recombination processes with increasing excitation density. 2006 Elsevier B.V. All rights reserved.

High energy proton-proton elastic scattering in Reggeon-Porneron exchange model 期刊论文 OAI收割
COMMUNICATIONS IN THEORETICAL PHYSICS, 2006, 卷号: 45, 期号: 6, 页码: 1069-1072
作者: Zhou, LJ; Hu, ZH; Ma WX(马维兴); Ma, WX

收藏 | 浏览/下载：314/0 | 提交时间：2016/06/29

Reggeon-Pomeron model Reggeon Pomeron Regge theory high energy elastic scattering