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  • AIP Publishing  (38)
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  • AIP Publishing  (38)
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  • 1
    Online Resource
    Online Resource
    Atomic diffusion in liquid Al–Cu melt under static magnetic fields
    AIP Publishing ; 2022
    In:  Journal of Applied Physics Vol. 132, No. 16 ( 2022-10-28)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 132, No. 16 ( 2022-10-28)
    Abstract: Atomic diffusion is a natural phenomenon in liquid melt. Avoiding the melt convection is the most challenging when accuracy in measuring the diffusion coefficient of atoms is desired. The diffusion in liquid Al–Cu melts is studied under various static magnetic fields (SMFs). Thermoelectric magnetic convection is induced during the diffusion in the conductive crucible. It is suppressed by increasing the magnetic flux density or eliminated by using an insulated crucible. The interdiffusion coefficient can be accurately measured in the SMF greater than 3 T. The present work provides a new view to study the solidification of alloys under the SMF.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/5.0110041
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 2
    Online Resource
    Online Resource
    Non-thermal air plasma jets at atmospheric pressure: The flow-dependent propagation in the afterglow
    AIP Publishing ; 2018
    In:  Journal of Applied Physics Vol. 124, No. 24 ( 2018-12-28)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 124, No. 24 ( 2018-12-28)
    Abstract: With a bare pin-to-nozzle electrode configuration, an ac-driven non-thermal air plasma jet with a length of several centimeters is generated. Depending on the gas flow rate, the propagation speed of these plasma columns is in the range of 100–350 m/s, which is close to the gas flow velocity. This indicates that the propagation of the plasma jet is determined by the transport of long lifetime species by gas flow instead of the electron-impact excitation and ionization of molecules under a high electric field. In comparison to the N2, O2, and Ar plasma jets, the length of the air plasma jet is much shorter than that of the N2 plasma jet but longer than that of the O2 and Ar plasma jets. A simple kinetic model reveals that the N2 (A3Σ) metastable plays a crucial role in sustaining the length of the N2 and air plasma jets, whose lifetime is strongly dependent on the quenching effect of O2, O, and NO as well as the compensation from the three-body recombination of nitrogen atoms. Based on the flow-dependent mechanism of the plasma jet, a visually uniform air plasma brush with a width of 2.8 cm and a length of 1.6 cm and a visually uniform N2 plasma brush with a width of 4 cm and a length of 4.4 cm have been demonstrated.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.5052187
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2018
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 3
    Online Resource
    Online Resource
    Fast calculation of temperature distribution in oil-immersed transformer windings based on U-net neural network
    AIP Publishing ; 2023
    In:  AIP Advances Vol. 13, No. 3 ( 2023-03-01)
    Details
    In: AIP Advances, AIP Publishing, Vol. 13, No. 3 ( 2023-03-01)
    Abstract: In this paper, a fast computational method based on the training of the U-net neural network is proposed to solve the fluid-thermal coupling problem of transformers. First, the input variables are selected according to the fluid-thermal coupling principle, and the finite volume method is applied to obtain the output results under different operating conditions and make them into training sets and test sets. Second, the training sets are normalized and input into the U-net neural network. At the same time, three hyperparameters that have more influence on the network training are discussed in detail, and the optimal combination of hyperparameters is determined. Finally, the prediction set is fed into the trained model for prediction computation, and the results are subjected to the inverse normalization operation, whose predictive results are consistent with those calculated by the finite volume method. In addition, the computational time is shortened from 300 to 0.07 s, and the prediction variance does not exceed 0.055 K2. The results show that the proposed method can be used to obtain the temperature of immersed transformer windings quickly, which provides an effective tool for real-time temperature simulation of the digital twin of power transformers.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/5.0140838
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 2583909-3
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  • 4
    Online Resource
    Online Resource
    Tuning interfacial charge transfer in atomically precise nanographene–graphene heterostructures by engineering van der Waals interactions
    AIP Publishing ; 2022
    In:  The Journal of Chemical Physics Vol. 156, No. 7 ( 2022-02-21)
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 156, No. 7 ( 2022-02-21)
    Abstract: Combining strong light absorption and outstanding electrical conductivity, hybrid nanographene–graphene (NG–Gr) van der Waals heterostructures (vdWHs) represent an emerging material platform for versatile optoelectronic devices. Interfacial charge transfer (CT), a fundamental process whose full control remains limited, plays a paramount role in determining the final device performance. Here, we demonstrate that the interlayer vdW interactions can be engineered by tuning the sizes of bottom-up synthesized NGs to control the interfacial electronic coupling strength and, thus, the CT process in NG–Gr vdWHs. By increasing the dimensions of NGs from 42 to 96 sp2 carbon atoms in the polyaromatic core to enhance the interfacial coupling strength, we find that the CT efficiency and rate in NG–Gr vdWHs display a drastic increase of one order of magnitude, despite the fact that the interfacial energy driving the CT process is unfavorably reduced. Our results shed light on the CT mechanism and provide an effective knob to tune the electronic coupling at NG–Gr interfaces by controlling the size-dependent vdW interactions.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/5.0081074
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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  • 5
    Online Resource
    Online Resource
    Design and fabrication of highly selective and permeable polymer membranes
    AIP Publishing ; 2020
    In:  Journal of Applied Physics Vol. 128, No. 13 ( 2020-10-07)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 128, No. 13 ( 2020-10-07)
    Abstract: Selective polymer membranes are one of the most promising materials to achieve large-scale and energy-efficient mass separation and energy conversion. However, their performance is subject to the selectivity–permeability trade-off. To overcome this trade-off and achieve high-performance ion separation, it is essential to fabricate thin membranes with a high density of uniformly sized nanopores with the pore size at around 1 nm. However, it has been challenging to precisely control the pore size at about 1 nm. In this Tutorial, we outline the underlying mechanism for selective ion transport through nanopores, especially the emerging mechanism as the nanopore size is tuned around 1 nm. Then, we review the recent development of the main fabrication methods of selective polymer membranes from either the top–down approach or the bottom–up approach, especially the novel techniques generating uniformly sized nanopores with nanometric or even subnanometric size. Finally, we discuss the future development of the design and fabrication of the selective polymer membranes to fulfill their potential in real applications.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/5.0015975
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 6
    Online Resource
    Online Resource
    Resistive switching polarity reversal due to ferroelectrically induced phase transition at BiFeO3/Ca0.96Ce0.04MnO3 heterostructures
    AIP Publishing ; 2023
    In:  Applied Physics Letters Vol. 122, No. 2 ( 2023-01-09)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 122, No. 2 ( 2023-01-09)
    Abstract: Ferroelectric resistive switching (RS) devices with functional oxide electrodes allow controlled emergent phenomena at an interface. Here, we demonstrate RS polarity reversal due to ferroelectrically induced phase transition at a doped charge transfer insulator interface. For BiFeO3/Ca0.96Ce0.04MnO3 bilayers grown on a NdAlO3 substrate, by applying voltages to a Ca0.96Ce0.04MnO3 bottom electrode, the resistance changes from a high resistance state (HRS) to a low resistance state (LRS) during a positive voltage cycle (0 → 3 → 0 V), and from a LRS to a HRS during a negative voltage cycle (0 → −3 → 0 V). The RS polarity is completely opposite the expected RS behavior in ferroelectric heterostructures induced by polarization reversal. It is proposed that the unique resistance switching polarity is attributed to the band-filling controlled metal-insulator transition in a Ca0.96Ce0.04MnO3 film, triggered by ferroelectric based electrostatic doping. The results address the importance of ferroelectric field effect on the electronic properties of the interfacial system in ferroelectric/complex oxide-based resistive memory devices.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0132819
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 7
    Online Resource
    Online Resource
    Compact, battery powered, wireless digitizers for in situ data acquisitions in the sino-united spherical tokamak
    AIP Publishing ; 2015
    In:  Review of Scientific Instruments Vol. 86, No. 7 ( 2015-07-01)
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 86, No. 7 ( 2015-07-01)
    Abstract: Potential isolation and long cable drive are very important in acquiring certain signals from tokamak diagnostics. Compact, battery powered, wireless digitizers for in situ data acquisition have been developed and routinely used in the sino-united spherical tokamak to solve the problems of isolation and long cables. The wireless digitizers utilize the integrated analog to digital converters and the static random access memory of microcontrollers but transfer data wirelessly. They consist of simple and concise circuits but have considerable performances of 12–16 bit in resolution and 500–1000 kS/s in sample rate. Wireless triggering and energy saving are two major challenges of the wireless digitizers. Wireless transceivers in the data link layer are used as trigger and can reduce the trigger jitters to be smaller than 1 μs. In order to reduce the energy consumption, the wireless digitizers are waken only when the tokamak is about to discharge. After discharges, they turn to a periodic checking mode with current consumption smaller than 200 μA. Because of low duty cycle, the wireless digitizers have a battery life of up to four weeks. In general, the wireless digitizers have better performance than normal isolation amplifiers and can greatly simplify the cable connections. They are very suitable for the data acquisition of dangerous and/or susceptible analog signals in tokamaks.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/1.4926466
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2015
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
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  • 8
    Online Resource
    Online Resource
    Design and calibration of high-frequency magnetic probes for the SUNIST spherical tokamak
    AIP Publishing ; 2014
    In:  Review of Scientific Instruments Vol. 85, No. 11 ( 2014-11-01)
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 85, No. 11 ( 2014-11-01)
    Abstract: A new high-frequency magnetic diagnostic system is designed, installed, and calibrated in the Sino-United Spherical Tokamak (SUNIST) to investigate Alfvén waves (AWs). The system consists of a fixed toroidal array and a movable radial array of high-frequency magnetic probes (HFMPs) with 21 and 60 probes, respectively. Based on the method of vacuum enameled wire wound on ceramic bobbins, the fixed toroidal array is located as near as possible to the plasma and carefully shielded to reduce the attenuation of high-frequency magnetic field. Meanwhile, by using the technology of commercial chip inductors mounted on printed circuit boards, the movable radial array is inserted into a thin quartz tube that allows positioning along radial direction. A Helmholtz coil is utilized to calibrate the effective areas as well as the frequency response of each HFMP. The calibration results are consistent with the calculated results of an equivalent probe-and-cable circuit model. High-frequency magnetic signals related to AW are detected with these HFMPs. These HFMPs are expected to play a key role in analyzing Alfvén eigenmodes excited by AW antenna in the SUNIST.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/1.4886423
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2014
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
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  • 9
    Online Resource
    Online Resource
    Superconductivity in Ca-intercalated epitaxial graphene on silicon carbide
    AIP Publishing ; 2013
    In:  Applied Physics Letters Vol. 103, No. 6 ( 2013-08-05)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 103, No. 6 ( 2013-08-05)
    Abstract: We have prepared Ca-intercalated multilayer epitaxial graphene films on silicon carbide and observed superconductivity in them with both magnetic and transport measurements. Superconducting transition has been detected at temperature up to 7 K in Ca-intercalated epitaxial graphene with the thickness down to 10 layers grown on both Si-face and C-face of silicon carbide. The result demonstrates intercalated epitaxial graphene as a good platform to study graphene-based superconductivity.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4817781
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2013
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 10
    Online Resource
    Online Resource
    Development of a triple probe array for mode conversion study of electron cyclotron wave
    AIP Publishing ; 2018
    In:  Review of Scientific Instruments Vol. 89, No. 10 ( 2018-10-01)
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 89, No. 10 ( 2018-10-01)
    Abstract: A triple probe array has been designed with a modified triple probe technique and utilized on the Sino-UNIted Spherical Tokamak for mode conversion research from the electron cyclotron wave to the electron Bernstein wave. The probe array is designed to measure the radial profile of the electron density in the edge region. The probe array consists of 36 single molybdenum tips, constituting 12 sets of triple probes with an interval of 6 mm in the radial direction. The three tips in each triple probe are displaced slightly in the radial direction, and thus they are not at the same magnetic surface to avoid shadow effects in the toroidal direction. A modified triple probe technique is used. The radial profile of the electron density of ohmic heated plasmas has been measured by the triple probe array. The temporal evolution of the density profile is presented, and the mode conversion processes are discussed.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/1.5038852
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2018
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
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