中国科学院机构知识库网格系统: 检索

A high power density photoactive thermal energy storage material for rapid heat release at low temperatures 期刊论文 OAI收割
MATERIALS CHEMISTRY AND PHYSICS, 2021, 卷号: 263, 页码: 8
作者: Yang, Xiangyu; Li, Shijie; Li, Lin; Wang, Xiaomin; Wang, Yongzhen

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Photoactive chemical heat storage material High power density Excellent cycling stability Rapid heat release

CoS2 nanosheets on carbon cloth for flexible all-solid-state supercapacitors 期刊论文 OAI收割
CHEMICAL ENGINEERING JOURNAL, 2020, 卷号: 400
作者: Chen, Wenyong; Wei, Tingting; Mo, Li-E; Wu, Shougang; Li, Zhaoqian

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Carbon cloth Cobalt sulfides Hierarchical structure All-solid-state supercapacitors High power density

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

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收藏 | 浏览/下载：40/0 | 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.

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.

High-performing rechargeable/flexible zinc-air batteries by coordinated hierarchical Bi-metallic electrocatalyst and heterostructure anion exchange membrane 期刊论文 OAI收割
NANO ENERGY, 2019, 卷号: 65
作者: Xu, Nengneng; Zhang, Yanxing; Wang, Min; Fan, Xiujun; Zhang, Tao

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Bifunctional catalyst High power density Rechargeable zinc-air battery Flexible all-solid-state zinc-air battery Wearable electronics

Simulation studies of the granular flow beryllium target for the compact materials irradiation facility 期刊论文 OAI收割
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 2019, 卷号: 942, 页码: 6
作者: Tao, Ke-Wei; Zhang, A-Ling; Cai, An-Jie; Yang, Guanghui; Zhang, Sheng

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Accelerator-driven system High energy neutron source High power density Granular flow target

Going Nano with Confined Effects to Construct Pomegranate-like Cathode for High-Energy and High-Power Lithium-Ion Batteries 期刊论文 OAI收割
ACS APPLIED MATERIALS & INTERFACES, 2019, 卷号: 11, 期号: 32, 页码: 28934-28942
作者: Cheng, Yi; Sang, Hongqian; Jiang, Qike; Wang, Haisong; Zhang, Huamin

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Li-ion battery cathode material pomegranate-like structure high energy density high power density

Influence of asymmetrical stator axes on the electromagnetic field and driving characteristics of canned induction motor 期刊论文 OAI收割
IET ELECTRIC POWER APPLICATIONS, 2019, 卷号: 13, 期号: 8, 页码: 1229-1239
作者: An Yuejun; Zhang Zhiheng; Li Ming; Wang Guangyu; Kong Xiangling

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收藏 | 浏览/下载：15/0 | 提交时间：2021/02/02

electric potential harmonic distortion stators finite element analysis induction motor drives machine control electromagnetic fields magnetic flux air gaps asymmetrical stator axes electromagnetic field driving characteristics canned induction motor high vacuum application asymmetrical stator phase healthy condition ASA conditions back-electromotive force winding theorem CIM control system finite-element models total harmonic distortion air-gap flux density stator current power 1 9 kW

Multicore-Shell Bi@N-doped Carbon Nanospheres for High Power Density and Long Cycle Life Sodium- and Potassium-Ion Anodes 期刊论文 OAI收割
ADVANCED FUNCTIONAL MATERIALS, 2019, 卷号: 29, 期号: 13, 页码: 11
作者: Ye, Shufen; Yu, Yan; Yang, Hai; Xu, Rui; Yao, Yu

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bismuth high power density multicore-shell potassium-ion batteries sodium-ion batteries

Flow field design and optimization of high power density vanadium flow batteries: A novel trapezoid flow battery 期刊论文 OAI收割
AICHE JOURNAL, 2018, 卷号: 64, 期号: 2, 页码: 782-795
作者: Yue, Meng; Zheng, Qiong; Xing, Feng; Zhang, Huamin; Li, Xianfeng

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收藏 | 浏览/下载：24/0 | 提交时间：2019/06/20

Vanadium Flow Battery High Power Density Mass Transport Modeling Flow Battery Design And Optimization