中国科学院机构知识库网格系统: 检索

Heat transfer rate characteristics of two-phase closed thermosyphon heat exchanger 期刊论文 OAI收割
RENEWABLE ENERGY, 2021, 卷号: 177, 页码: 397-410
作者: Song, Wei; Zheng, Changjin; Yang, Jiaming

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收藏 | 浏览/下载：30/0 | 提交时间：2021/10/21

Ground source heat pump Sandbox test bench Seepage Heat transfer rate characteristics Two-phase closed thermosyphon heat exchangers

A biofuel risk management model for biomass-based heat sources considering supply-demand-side uncertainties 会议论文 OAI收割
Chengdu, China, October 27-30, 2021
作者: Fu DZ(付殿峥); Zhou, Tingting; Tang TJ(杨天吉); Zhang T(张涛); Dong JY(董静雅)

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收藏 | 浏览/下载：104/0 | 提交时间：2021/12/13

Biofuel risk management uncertainty biomass-based heat source chance-constrained programming two-stage stochastic programming

No pulsed radio emission during a bursting phase of a Galactic magnetar 期刊论文 OAI收割
Nature, 2020, 卷号: 587, 页码: 63-65
作者: HXMT

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收藏 | 浏览/下载：44/0 | 提交时间：2022/02/08

Astrophysics - High Energy Astrophysical Phenomena Abstract: Fast radio bursts (FRBs) are millisecond-duration radio transients of unknown physical origin observed at extragalactic distances^1-3. It has long been speculated that magnetars are the engine powering repeating bursts from FRB sources^4-13, but no convincing evidence has been collected so far¹⁴. Recently, the Galactic magnetar SRG 1935+2154 entered an active phase by emitting intense soft íray bursts¹⁵. One FRB-like event with two peaks (FRB 200428) and a luminosity slightly lower than the faintest extragalactic FRBs was detected from the source, in association with a soft íray/hard-X-ray flare^18-21. Here we report an eight-hour targeted radio observational campaign comprising four sessions and assisted by multi-wavelength (optical and hard-X-ray) data. During the third session, 29 soft-íray repeater (SGR) bursts were detected in íray energies. Throughout the observing period, we detected no single dispersed pulsed emission coincident with the arrivals of SGR bursts, but unfortunately we were not observing when the FRB was detected. The non-detection places a fluence upper limit that is eight orders of magnitude lower than the fluence of FRB 200428. Our results suggest that FRB-SGR burst associations are rare. FRBs may be highly relativistic and geometrically beamed, or FRB-like events associated with SGR bursts may have narrow spectra and characteristic frequencies outside the observed band. It is also possible that the physical conditions required to achieve coherent radiation in SGR bursts are difficult to satisfy, and that only under extreme conditions could an FRB be associated with an SGR burst.

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：59/0 | 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.

Leg-By-Leg-Based Finite-Control-Set Model Predictive Control for Two-Level Voltage-Source Inverters 期刊论文 OAI收割
JOURNAL OF POWER ELECTRONICS, 2019, 卷号: 19, 期号: 5, 页码: 1162-1170
作者: Zhang, Tao; Lang, Zhengying; Qi C(齐琛); Chen XY(陈希有)

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收藏 | 浏览/下载：61/0 | 提交时间：2019/10/10

Current control Model predictive control Two-level voltage-source inverter

The mixing of multi-source fluids in the Wusihe Zn-Pb ore deposit in Sichuan Province, Southwestern China 期刊论文 OAI收割
Acta Geochimica, Acta Geochimica, 2019, 2019, 卷号: 38, 38, 期号: 5, 页码: 642-653, 642-653
作者: Hongjie Zhang; Haifeng Fan; Chaoyi Xiao; Hanjie Wen; Lin Ye

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收藏 | 浏览/下载：39/0 | 提交时间：2020/04/27

Sichuan-yunnan-guizhou Sichuan-yunnan-guizhou Wusihe Zn-pb Deposit Zn-s Isotopes Fe-cd Contents Two-source Fluids Wusihe Zn-pb Deposit Zn-s Isotopes Fe-cd Contents Two-source Fluids

The mixing of multi-source fluids in the Wusihe Zn–Pb ore deposit in Sichuan Province, Southwestern China 期刊论文 OAI收割
Acta Geochimica, Acta Geochimica, 2019, 2019, 页码: 1-12, 1-12
作者: Hongjie Zhang; Haifeng Fan; Chaoyi Xiao; Hanjie Wen; Lin Ye

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收藏 | 浏览/下载：22/0 | 提交时间：2020/10/27

Sichuan–yunnan–guizhou Sichuan–yunnan–guizhou Wusihe Zn–pb Deposit Zn–s Isotopes Fe–cd Contents Two-source Fluids Wusihe Zn–pb Deposit Zn–s Isotopes Fe–cd Contents Two-source Fluids

Evapotranspiration partitioning at the ecosystem scale using the stable isotope method-A review 期刊论文 OAI收割
AGRICULTURAL AND FOREST METEOROLOGY, 2018, 卷号: 263, 页码: 346-361
作者: Xiao, Wei; Wei, Zhongwang; Wen, Xuefa

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收藏 | 浏览/下载：75/0 | 提交时间：2019/05/23

Evapotranspiration partitioning Stable isotope Two-source mixing model Craig-Gordon model Keeling plot approach Kinetic fractionation factor

Intercomparison of Three Two-Source Energy Balance Models for Partitioning Evaporation and Transpiration in Semiarid Climates 期刊论文 OAI收割
REMOTE SENSING, 2018, 卷号: 10, 期号: 7, 页码: 20
作者: Yang, Yongmin; Qiu, Jianxiu; Zhang, Renhua; Huang, Shifeng; Chen, Sheng

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收藏 | 浏览/下载：53/0 | 提交时间：2019/05/23

component temperature decomposition evapotranspiration partitioning two-source energy balance model

Evapotranspiration partitioning for three agro-ecosystems with contrasting moisture conditions: a comparison of an isotope method and a two-source model calculation 期刊论文 OAI收割
AGRICULTURAL AND FOREST METEOROLOGY, 2018, 卷号: 252, 页码: 296-310
作者: Wei, Zhongwang; Lee, Xuhui; Wen, Xuefa; Xiao, Wei

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收藏 | 浏览/下载：32/0 | 提交时间：2019/05/30

Agro-ecosystems Evapotranspiration partitioning Isotope Two-source model