中国科学院机构知识库网格系统: 检索

Recent developments on epoxy-based syntactic foams for deep sea exploration 期刊论文 OAI收割
JOURNAL OF MATERIALS SCIENCE, 2020, 卷号: 56, 期号: 3, 页码: 2037-2076
作者: Wu, Xinfeng; Gao, Yuan; Wang, Ying; Fan, Runhua; Ali, Zulfiqar

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DYNAMIC-MECHANICAL PROPERTIES MATRIX SANDWICH COMPOSITE COMPRESSIVE PROPERTIES STRAIN-RATE HOLLOW SPHERES TENSILE PROPERTIES ENERGY-ABSORPTION LOW-DENSITY VISCOELASTIC PROPERTIES THERMAL-CONDUCTIVITY

Introducing a special collection of papers in the Journal of High Energy Astrophysics on the Early Results of China's 1st X-ray Astronomy Satellite: Insight-HXMT 期刊论文 OAI收割
Journal of High Energy Astrophysics, 2020, 卷号: 27, 页码: 51-52
作者: HXMT

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Astrophysics - High Energy Astrophysical Phenomena Abstract: Insight-HXMT is the first Chinese X-ray astronomical mission, launched successfully on June 15, 2017, from China's Jiuquan Satellite Launch Center. Insight-HXMT was designed to have a broad energy coverage in X-rays, from 1-250 keV, with excellent timing and adequate energy resolution at soft X-rays, and the largest effective area at hard X-rays. This allows, in particular, to observe bright sources like X-ray binaries (XRBs) in their bright/outburst states with high cadence and high statistics at hard and soft X-rays at once. It was then expected that the Insight-HXMT mission will bring us new insights regarding the characteristics of several source classes. Examples include characterizing High-Mass X-ray Binaries (HMXBs) and the outburst evolution of Low-Mass X-ray Binaries (LMXBs). For instance, in HMXB systems, the region around their Alfven radius that is responsible to determine whether accretion or propeller occurs, or the region around the NS magnetic pole where the intense X-rays are supposed to be produced are specially appealing targets of study. For the LMXBs, the evolution the outburst and the properties of the compact objects themselves are obvious priority targets for Insight-HXMT. Due to the broad coverage in energy, Insight-HXMT is specially well suited to study the influence of thermonuclear (type-I) X-ray bursts upon the surrounding environment.

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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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.

Stoichiometry and tribological behavior of thick Ta(N) coatings produced by direct current magnetron sputtering (DCMS) 期刊论文 OAI收割
APPLIED SURFACE SCIENCE, 2018, 卷号: 427, 页码: 1071-1079
作者: Guo, XT; Niu, YS; Chen, MH; Sun, WY; Zhu, SL

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Mechanical-properties Low-energy Films Tantalum Wear Microstructure Nitrogen Power Tan Environments

Ion irradiation induced disappearance of dislocations in a nickel-based alloy 期刊论文 OAI收割
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS, 2016, 卷号: 377, 期号: -, 页码: 94—98
作者: Chen, HC; Li, DH; Lui, RD; Huang, HF; Li, JJ

收藏 | 浏览/下载：38/0 | 提交时间：2016/09/12

LOW-ENERGY HELIUM MECHANICAL-PROPERTIES INTERSTITIAL LOOPS MOLECULAR-DYNAMICS EDGE DISLOCATION CASCADE DAMAGE KINETIC THEORY DILUTE ALLOYS FCC METALS TEMPERATURE

Control of organic-inorganic halide perovskites in solid-state solar cells: a perspective 期刊论文 OAI收割
Science Bulletin, 2015, 卷号: 60, 期号: 4, 页码: 405-418
Q.; Chen Wang, H. J.; Liu, G.; Wang, L. Z.

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Perovskite solar cells Fabrication procedures High performance hole-conductor-free energy-conversion efficiency formamidinium lead trihalide open-circuit voltage optical-properties low-temperature thin-films electrical-conductivity porphyrin sensitizers hollow microspheres

Oligothiophene-Bridged Bis(arylene ethynylene) Small Molecules for Solution-Processible Organic Solar Cells with High Open-Circuit Voltage 期刊论文 OAI收割
chemistry-an asian journal, 2013, 卷号: 8, 期号: 8, 页码: 1892-1900
Liu Q; Zhan HM; Ho CL; Dai FR; Fu YY; Xie ZY; Wang LX; Li JH; Yan F; Huang SP; Wong WY

收藏 | 浏览/下载：30/0 | 提交时间：2014/04/15

LOW-BAND-GAP PHOTOVOLTAIC PROPERTIES RENEWABLE ENERGY POLYMER EFFICIENCY SEXITHIOPHENES POLYTHIOPHENES ENHANCEMENT CONVERSION COPOLYMERS

The elastic properties, elastic models and elastic perspectives of metallic glasses 期刊论文 OAI收割
PROGRESS IN MATERIALS SCIENCE, 2012, 卷号: 57, 期号: 3, 页码: 487
Wang, WH

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BULK AMORPHOUS ALLOY RESONANT ULTRASOUND SPECTROSCOPY POTENTIAL-ENERGY LANDSCAPE SOFT-MAGNETIC PROPERTIES MEDIUM-RANGE ORDER JOHARI-GOLDSTEIN RELAXATION FORMING SUPERCOOLED LIQUID LOW-TEMPERATURE DEPENDENCE SOLID-STATE AMORPHIZATION NEAREST-NEIGHBOR DISTANCE

LaOF: Eu3+ nanocrystals: hydrothermal synthesis, white and color-tuning emission properties 期刊论文 OAI收割
dalton transactions, 2012, 卷号: 41, 期号: 18, 页码: 5571-5580
Shang MM; Li GG; Kang XJ; Yang DM; Geng DL; Peng C; Cheng ZY; Lian HZ; Lin J

收藏 | 浏览/下载：20/0 | 提交时间：2013/06/30

LOW-VOLTAGE CATHODOLUMINESCENCE RARE-EARTH FLUORIDE LUMINESCENCE PROPERTIES THIN-FILMS LANTHANUM OXYFLUORIDE TUNABLE LUMINESCENCE EMITTING PHOSPHORS ENERGY-TRANSFER FIELD MORPHOLOGIES

Ln(3+) (Ln Eu, Dy, Sm, and Er) Ion-Doped YVO4 Nano/Microcrystals with Multiform Morphologies: Hydrothermal Synthesis, Growing Mechanism, and Luminescent Properties 期刊论文 OAI收割
inorganic chemistry, 2010, 卷号: 49, 期号: 14, 页码: 6706-6715
Xu ZH; Kang XJ; Li CX; Hou ZY; Zhang CM; Yang DM; Li GG; Lin J

收藏 | 浏览/下载：21/0 | 提交时间：2012/04/26

UP-CONVERSION FLUORESCENCE OPTICAL-PROPERTIES COLLOIDAL YVO4-EU TIO2 NANOCRYSTALS COLOR TELEVISION GROWTH-MECHANISM RAPID SYNTHESIS LOW-TEMPERATURE ENERGY-TRANSFER LIGHT EMISSION