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  • IOP Publishing  (140)
  • 2020-2024  (140)
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  • IOP Publishing  (140)
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  • 2020-2024  (140)
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  • 1
    Online Resource
    Online Resource
    Current limiting tests of a prototype 160 kV/1 kA resistive DC superconducting fault current limiter
    IOP Publishing ; 2021
    In:  Superconductor Science and Technology Vol. 34, No. 1 ( 2021-01-01), p. 014002-
    Details
    In: Superconductor Science and Technology, IOP Publishing, Vol. 34, No. 1 ( 2021-01-01), p. 014002-
    Abstract: High voltage direct current (HVDC) transmission technology has begun to play a great role in power transmission industry over the last decade. However, short-circuit fault seriously threatens the safety of an HVDC network. In order to reduce the fault current level of an HVDC network, utilizing a superconducting fault current limiter (SFCL) was proposed by researchers and engineers worldwide. Recently, Guangdong Grid Company of China Southern Power Grid, Co. has led a project to develop a 160 kV/1 kA resistive type DC SFCL. As a middle-step objective, a 160 kV/1 kA laboratory prototype has been developed. Due to a facility with an adequate capacity for testing such DC equipment is practically inaccessible, the current limiting performance of the prototype cannot be tested with a straightforward current limiting experiment. In practice, effectual alternative methods have to be adopted. Since the AC half-wave impact method requires less equipment and cost than the DC impact method, we took on an AC half wave impact current method to evaluate the current limiting function of the prototype alternatively. In this paper, we report the procedures and results of these tests.
    Type of Medium: Online Resource
    ISSN: 0953-2048 , 1361-6668
    URL: Article
    DOI: 10.1088/1361-6668/abc2b1
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 1361475-7
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    Online Resource
  • 2
    Online Resource
    Online Resource
    A new calibration method for charm jet identification validated with proton-proton collision events at √s = 13 TeV
    IOP Publishing ; 2022
    In:  Journal of Instrumentation Vol. 17, No. 03 ( 2022-03-01), p. P03014-
    Details
    In: Journal of Instrumentation, IOP Publishing, Vol. 17, No. 03 ( 2022-03-01), p. P03014-
    Abstract: Many measurements at the LHC require efficient identification of heavy-flavour jets, i.e. jets originating from bottom (b) or charm (c) quarks. An overview of the algorithms used to identify c jets is described and a novel method to calibrate them is presented. This new method adjusts the entire distributions of the outputs obtained when the algorithms are applied to jets of different flavours. It is based on an iterative approach exploiting three distinct control regions that are enriched with either b jets, c jets, or light-flavour and gluon jets. Results are presented in the form of correction factors evaluated using proton-proton collision data with an integrated luminosity of 41.5 fb -1 at  √s = 13 TeV, collected by the CMS experiment in 2017. The closure of the method is tested by applying the measured correction factors on simulated data sets and checking the agreement between the adjusted simulation and collision data. Furthermore, a validation is performed by testing the method on pseudodata, which emulate various mismodelling conditions. The calibrated results enable the use of the full distributions of heavy-flavour identification algorithm outputs, e.g. as inputs to machine-learning models. Thus, they are expected to increase the sensitivity of future physics analyses.
    Type of Medium: Online Resource
    ISSN: 1748-0221
    URL: Article
    DOI: 10.1088/1748-0221/17/03/P03014
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 2235672-1
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    Online Resource
  • 3
    Online Resource
    Online Resource
    Surface energetics mediated charge transfer and exciton transfer in cation-adsorbed rubrene/PbS nanocrystal hybrids
    IOP Publishing ; 2022
    In:  Journal of Physics: Energy Vol. 4, No. 4 ( 2022-10-01), p. 044013-
    Details
    In: Journal of Physics: Energy, IOP Publishing, Vol. 4, No. 4 ( 2022-10-01), p. 044013-
    Abstract: Organic molecule and inorganic nanocrystal (NC) hybrids have become a promising platform for photon energy conversion. Although surface energetics modification has proven effective in promoting triplet energy transfer, singlet energy transfer and charge transfer have been barely investigated. Here, we systematically clarify the photophysical dynamics of charge, singlet exciton, and triplet exciton within the energy conversion process based on hybrids of rubrene and Cd 2+ -adsorbed PbS NCs. It is found that a considerable number of charges in rubrene molecules can be transferred to cation-induced surface states in the ∼2 ps time scale with high efficiency to trigger a delayed biexciton effect, which provides a novel approach to uncover the intermediate role of NC surface states. For the triplet exciton, strong interaction with surface states is investigated with a recycling energy transfer of around 14% efficiency, which is found to be insensitive to changes in NC surface energetics. As a result, the maximum photoluminescence lifetime of PbS NCs was enhanced by about 38%. This work reveals the neglected photo-physical dynamics in the transfer process between organic molecules/inorganic NCs and validates the capability of the surface state in sensitization of organic charges and excitons.
    Type of Medium: Online Resource
    ISSN: 2515-7655
    URL: Article
    DOI: 10.1088/2515-7655/ac9807
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 2950951-8
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    Online Resource
  • 4
    Online Resource
    Online Resource
    Thermoelectric properties of orthorhombic silicon allotrope Si (oP32) from first-principles calculations*
    IOP Publishing ; 2020
    In:  Chinese Physics B Vol. 29, No. 11 ( 2020-11-01), p. 118401-
    Details
    In: Chinese Physics B, IOP Publishing, Vol. 29, No. 11 ( 2020-11-01), p. 118401-
    Abstract: The diamond-like cubic silicon (d-Si) is widely used in modern electronics and solar cell industries. However, it is not an optimal candidate for thermoelectric application due to its high lattice thermal conductivity. Si (oP32) is a recently predicted orthorhombic silicon allotrope, whose total energy is close to that of d-Si. Using first-principles calculations and Boltzmann transport theory, we systematically investigate the thermoelectric properties of Si (oP32). The lower phonon thermal conductivity and higher power factor are obtained in Si (oP32) than those in diamond silicon. The low phonon thermal conductivity (33.77 W/mK at 300 K) is mainly due to the reduction of the phonon group velocity and enhancement of phonon–phonon scattering (including scattering phase space and strength). Meanwhile, the results also show that the thermoelectric performance along the zz lattice direction is better than that along the xx and yy lattice directions, and the figure of merit (700 K) along the zz lattice direction could approach to 2.45 and 1.75 for p-type and n-type Si (oP32), respectively. The values are much higher than those of d-Si (about 0.06)) and Si 24 (0.6), indicating that the Si (oP32) is a promising candidate for thermoelectric applications. Our theoretical studies shed light on the thermoelectric properties of Si (oP32) and could stimulate further experimental studies.
    Type of Medium: Online Resource
    ISSN: 1674-1056
    URL: Article
    DOI: 10.1088/1674-1056/aba2e1
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 2412147-2
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    Online Resource
  • 5
    Online Resource
    Online Resource
    Band Alignment at the Al 2 O 3 /β-Ga 2 O 3 Interface with CHF 3 Treatment *
    IOP Publishing ; 2020
    In:  Chinese Physics Letters Vol. 37, No. 7 ( 2020-07-01), p. 077302-
    Details
    In: Chinese Physics Letters, IOP Publishing, Vol. 37, No. 7 ( 2020-07-01), p. 077302-
    Abstract: The energy band alignment at the atomic layer deposited Al 2 O 3 / β -Ga 2 O 3 interface with CHF 3 treatment was characterized by x-ray photoelectron spectroscopy and secondary ion mass spectrometry (SIMS). With additional CHF 3 plasma treatment, the conduction band offset increases from 1.95±0.1 eV to 2.32±0.1 eV; and the valence band offset decreases from 0.21±0.1 eV to −0.16±0.1 eV. As a result, the energy band alignment changes from type I to type II. This energy band alignment transition could be attributed to the downshift of the core-level of Ga 3 d , resulting from the Ga–F bond formation in the F-rich interfacial layer, which is confirmed by the SIMS results.
    Type of Medium: Online Resource
    ISSN: 0256-307X , 1741-3540
    URL: Article
    DOI: 10.1088/0256-307X/37/7/077302
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 2040565-0
    SSG: 6,25
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    Online Resource
  • 6
    Online Resource
    Online Resource
    Further study of a novel inductive SFCL for multiterminal HVDC systems
    IOP Publishing ; 2021
    In:  Superconductor Science and Technology Vol. 34, No. 11 ( 2021-11-01), p. 114002-
    Details
    In: Superconductor Science and Technology, IOP Publishing, Vol. 34, No. 11 ( 2021-11-01), p. 114002-
    Type of Medium: Online Resource
    ISSN: 0953-2048 , 1361-6668
    URL: Article
    DOI: 10.1088/1361-6668/ac2555
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 1361475-7
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    Online Resource
  • 7
    Online Resource
    Online Resource
    Ultraviolet irradiation dosimeter based on persistent photoconductivity effect of ZnO*
    IOP Publishing ; 2020
    In:  Chinese Physics B Vol. 29, No. 5 ( 2020-05-01), p. 058504-
    Details
    In: Chinese Physics B, IOP Publishing, Vol. 29, No. 5 ( 2020-05-01), p. 058504-
    Abstract: It is essential to determine the accumulative ultraviolet (UV) irradiation over a period of time in some cases, such as monitoring UV irradiation to the skin, solar disinfection of water, photoresist exposure, etc. UV colorimetric dosimeters, which use dyes’ color change to monitor the amount of UV exposure, have been widely studied. However, the exposure data of these UV colorimetric dosimeters can hardly be converted to digital signals, limiting their applications. In this paper, a UV dosimeter has been proposed and demonstrated based on the persistent photoconductivity (PPC) in zinc oxide microwires (ZnO MWs). The PPC effect usually results in high photoconductivity gain but low response speed, which has been regarded as a disadvantage for photodetectors. However, in this work, the unique characteristics of the PPC effect have been utilized to monitoring the accumulative exposure. We demonstrate that the photocurrent in the ZnO MWs depends on the accumulative UV exposure due to the PPC effect, thus the photocurrent can be utilized to determine the UV accumulation. The dosimeter is immune to visible light and exhibits a photoconductive gain of 2654, and the relative error of the dosimeter is about 10%. This UV dosimeter with electrical output is reusable and convenient to integrate with other electronic devices and may also open a new application area for the PPC effect.
    Type of Medium: Online Resource
    ISSN: 1674-1056
    URL: Article
    DOI: 10.1088/1674-1056/ab8891
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 2412147-2
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    Online Resource
  • 8
    Online Resource
    Online Resource
    FAST Observations of an Extremely Active Episode of FRB 20201124A. III. Polarimetry
    IOP Publishing ; 2022
    In:  Research in Astronomy and Astrophysics Vol. 22, No. 12 ( 2022-12-01), p. 124003-
    Details
    In: Research in Astronomy and Astrophysics, IOP Publishing, Vol. 22, No. 12 ( 2022-12-01), p. 124003-
    Abstract: As the third paper in the multiple-part series, we report the statistical properties of radio bursts detected from the repeating fast radio burst (FRB) source FRB 20201124A with the Five-hundred-meter Aperture Spherical radio Telescope during an extremely active episode between the 25th and 28th of September 2021 (UT). We focus on the polarization properties of 536 bright bursts with S/N 〉 50. We found that the Faraday rotation measures (RMs) monotonically dropped from −579 to −605 rad m −2 in the 4 day window. The RM values were compatible with the values (−300 to −900 rad m −2 ) reported 4 months ago. However, the RM evolution rate in the current observation window was at least an order of magnitude smaller than the one (∼500 rad m −2 day −1 ) previously reported during the rapid RM-variation phase, but is still higher than the one (≤1 rad m −2 day −1 ) during the later RM no-evolution phase. The bursts of FRB 20201124A were highly polarized with the total degree of polarization (circular plus linear) greater than 90% for more than 90% of all bursts. The distribution of linear polarization position angles (PAs), degree of linear polarization ( L / I ) and degree of circular polarization ( V / I ) can be characterized with unimodal distribution functions. During the observation window, the distributions became wider with time, i.e., with larger scatter, but the centroids of the distribution functions remained nearly constant. For individual bursts, significant PA variations (confidence level 5 σ ) were observed in 33% of all bursts. The polarization of single pulses seems to follow certain complex trajectories on the Poincaré sphere, which may shed light on the radiation mechanism at the source or the plasma properties along the path of FRB propagation.
    Type of Medium: Online Resource
    ISSN: 1674-4527
    URL: Article
    DOI: 10.1088/1674-4527/ac98f6
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 2511247-8
    SSG: 6,25
    SSG: 16,12
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    Online Resource
  • 9
    Online Resource
    Online Resource
    Luminosities and energies of e + e − collision data taken between =4.61 GeV and 4.95 GeV at BESIII*
    IOP Publishing ; 2022
    In:  Chinese Physics C Vol. 46, No. 11 ( 2022-11-01), p. 113003-
    Details
    In: Chinese Physics C, IOP Publishing, Vol. 46, No. 11 ( 2022-11-01), p. 113003-
    Abstract: From December 2019 to June 2021, the BESIII experiment collected approximately 5.85 fb −1 of data at center-of-mass energies between 4.61 and 4.95 GeV. This is the highest collision energy BEPCII has reached to date. The accumulated annihilation data samples are useful for studying charmonium(-like) states and charmed-hadron decays. By adopting a novel method of analyzing the production of pairs in annihilation, the center-of-mass energies are measured with a precision of 0.6 MeV. Integrated luminosities are measured with a precision of better than 1% by analyzing the events of large-angle Bhabha scattering. These measurements provide important inputs to analyses based on these data samples.
    Type of Medium: Online Resource
    ISSN: 1674-1137 , 2058-6132
    URL: Article
    DOI: 10.1088/1674-1137/ac84cc
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 2491278-5
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    Online Resource
  • 10
    Online Resource
    Online Resource
    Conversion of carbon dioxide in atmospheric pressure dielectric barrier discharges with different electrode configurations
    IOP Publishing ; 2023
    In:  Physica Scripta Vol. 98, No. 8 ( 2023-08-01), p. 085605-
    Details
    In: Physica Scripta, IOP Publishing, Vol. 98, No. 8 ( 2023-08-01), p. 085605-
    Abstract: The choice of electrode configuration and dielectric material is critical to the discharge process and plasma characteristics of a dielectric barrier discharge (DBD) reactor. In this study, a new electrode configuration of DBD reactor with copper mesh as electrode inserted between dielectrics is proposed, which has a much higher capacitance than the conventional double-dielectric layer DBD reactor. Two materials with different relative dielectric permittivities, alumina and zirconia, are chosen as dielectrics for an experimental comparison of CO 2 decomposition. The experimental results show that the conversion rate of CO 2 for the reactor with copper mesh inserted between dielectrics are higher than that of the corresponding double dielectric layer reactor under the same discharge power, and the conversion rate of CO 2 with zirconia as a dielectric material is higher than the case of alumina as a dielectric. Further analysis of discharge characteristics shows that for the reactor with copper mesh inserted between dielectrics, the applied voltage required for discharge is significantly reduced, the amount of transferred charge is significantly increased, and the number of micro-discharge current pulses as well as the average lifetime during a single voltage cycle are also considerably increased, leading to an increase in the CO 2 discharge efficiency and conversion rate.
    Type of Medium: Online Resource
    ISSN: 0031-8949 , 1402-4896
    URL: Article
    DOI: 10.1088/1402-4896/ace2fe
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 1477351-X
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