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  • AIP Publishing  (19)
  • 2020-2024  (19)
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  • AIP Publishing  (19)
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  • 2020-2024  (19)
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  • 1
    Online Resource
    Online Resource
    Single-step maskless nano-lithography on glass by femtosecond laser processing
    AIP Publishing ; 2020
    In:  Journal of Applied Physics Vol. 127, No. 16 ( 2020-04-30)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 127, No. 16 ( 2020-04-30)
    Abstract: Femtosecond laser processing is widely adopted today for microfabrication because of its ability to make rapid processing on almost all types of materials in ambient environment. However, it is challenging to apply femtosecond lasers for high-speed large-scale subwavelength nanofabrication, particularly, for two-dimensional nanopatterning on transparent dielectric materials due to their low light absorption. Previous demonstrations of femtosecond laser two-dimensional nanofabrication on dielectrics typically lack structural quality and long-range uniformity. In this work, we report a maskless laser nano-lithographic technique to fabricate high-quality two-dimensional periodic nanodomes on glass. The glass sample is first coated with a thin copper film and then irradiated by femtosecond laser pulses. We show that the period and size of the nanodomes can be controlled using a multi-fluence process. More importantly, a single-fluence technique is developed here, for the first time, for high-quality nanopatterning on glass. The nanopatterning formation mechanism is studied by dynamics experiments and numerical simulations. This introduced technique will provide a simple but highly effective way for dielectrics nanofabrication.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.5142700
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 2
    Online Resource
    Online Resource
    Investigation of audible sound waves on the heat transfer characteristics of air-to-air heat exchange systems
    AIP Publishing ; 2023
    In:  Physics of Fluids Vol. 35, No. 3 ( 2023-03-01)
    Details
    In: Physics of Fluids, AIP Publishing, Vol. 35, No. 3 ( 2023-03-01)
    Abstract: To reveal the mechanism of the effect of audible sound waves on the heat transfer process, the flow and heat transfer characteristics of an air-to-air heat exchanger were analyzed by incidence of sound waves with different intensities on its cold, hot, and both sides. The results showed that the sound waves incident on the cold side enhanced the heat exchange between the unstable cold flow and hot surface, which decreased the surface temperature of the latter with an increasing sound pressure level (SPL). In contrast, the sound waves incident on the hot side increased the surface temperature, thereby enhancing the heat transfer performance. When the SPL increased to 140 dB, the average surface heat flux increased by 8.22% and 15.19% under the sound waves incident on the cold and hot sides, respectively, whereas the sound energy efficiency was relatively higher with the sound waves incident on the cold side. Additionally, under the synergetic effect of the incidence of sound waves on both sides on the flow characteristics, the average surface heat flux increased by 25.56%. It was higher than the summation of the corresponding fluxes under the incidence of sound waves on single side, while the sound energy efficiency decreased under high SPL. The results indicated that sound waves incident on both sides can effectively enhance the heat transfer performance. This research is significant for the application of sound waves on the heat transfer process of air-to-air heat exchange systems.
    Type of Medium: Online Resource
    ISSN: 1070-6631 , 1089-7666
    URL: Article
    DOI: 10.1063/5.0139945
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 1472743-2
    detail.hit.zdb_id: 241528-8
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    Online Resource
  • 3
    Online Resource
    Online Resource
    193 nm laser annealing on p-GaN with enhanced hole concentration and wall-plug-efficiency in deep ultraviolet LED
    AIP Publishing ; 2023
    In:  Applied Physics Letters Vol. 123, No. 18 ( 2023-10-30)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 123, No. 18 ( 2023-10-30)
    Abstract: The high acceptor ionization energy and, thus, low carrier concentration in p-type III-nitride have widely been recognized as the bottleneck preventing the development of high-efficiency light-emitting-diodes (LEDs). In this contribution, the influences of 193 nm pulsed laser annealing on the structure, electrical, and optical properties of p-type GaN were systematically analyzed. The hole concentration of p-GaN first increases and then decreases with increasing laser fluence, regardless of post-growth thermal annealing. The effective dopant activation due to laser annealing can be attributed to the dissociation of Mg–H complexes during the treatment. Laser-annealed p-GaN was utilized in a 280 nm deep ultraviolet LED. A maximum of 1.47 times higher wall-plug-efficiency enhancement factor was obtained compared to that without laser annealing, demonstrating that 193 nm laser annealing plays a decisive role in the boosting of quantum efficiency of optoelectronic devices.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0169647
    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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    Online Resource
  • 4
    Online Resource
    Online Resource
    Influence of jet flow on hydrodynamic performance of a ducted propeller
    AIP Publishing ; 2023
    In:  Physics of Fluids Vol. 35, No. 12 ( 2023-12-01)
    Details
    In: Physics of Fluids, AIP Publishing, Vol. 35, No. 12 ( 2023-12-01)
    Abstract: This study introduces a concept that jet technology in the aeronautical field is used for active flow control to improve the hydrodynamic performance of a ducted propeller. Jet flow is added in front of the ducted propeller, and it produces a circumferential velocity that is opposite to the rotation direction of the rotor. An international standard ducted propeller was adopted to demonstrate this concept. The unsteady Reynolds-averaged Navier–Stokes method and the shear stress transport k−ω turbulence model were employed for the simulations. The open-source platform OpenFOAM was utilized. The overall efficiency η0 of the ducted propeller first increases and then decreases with increasing the jet flow velocity Rjf from 1 to 3 and the distance L to the rotation center from 0.2D to 0.4D. When the jet flow is at the optimal condition of Rjf=2 and L=0.3D, the maximum efficiency improvement of 3.1% is achieved for the ducted propeller. The reason is that the jet flow contributes to a pressure increase in the flow through the rotor. This effect is related to tip and hub vortices, which are disrupted by the jet flow and have relatively low vorticity magnitudes compared to the reference case without jet. The findings in this study have the potential to advance the development of active flow control technology for ships.
    Type of Medium: Online Resource
    ISSN: 1070-6631 , 1089-7666
    URL: Article
    DOI: 10.1063/5.0175516
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 1472743-2
    detail.hit.zdb_id: 241528-8
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    Online Resource
  • 5
    Online Resource
    Online Resource
    A new BGK model to compute the scattering characteristics of electromagnetic waves by weakly ionized dusty plasma shroud
    AIP Publishing ; 2020
    In:  Physics of Plasmas Vol. 27, No. 2 ( 2020-02-01)
    Details
    In: Physics of Plasmas, AIP Publishing, Vol. 27, No. 2 ( 2020-02-01)
    Abstract: The dynamics theory of dust charging in the Bhatnagar–Gross–Krook (BGK) model is changed, and the updated expression of the complex permittivity for weakly ionized dusty plasma is derived. Then, by using the physical optics method, the radar-cross section (RCS) of electrically large blunt cones covered by dusty plasma with weak ionization is calculated under the new complex permittivity and compared with the traditional results. The numerical results indicate that the new values of the RCS are significantly smaller than their traditional values. In addition, the influence of dust plasma parameters on the scattering characteristics of EM waves is discussed under the new BGK model. The results enriched the physical mechanisms of the scattering characteristics of weakly ionized dusty plasma shroud and provide a theoretical basis for future studies.
    Type of Medium: Online Resource
    ISSN: 1070-664X , 1089-7674
    URL: Article
    DOI: 10.1063/1.5126950
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 1179425-2
    detail.hit.zdb_id: 1472746-8
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  • 6
    Online Resource
    Online Resource
    Experimental and theoretical studies on heavy fluid layers with reshock
    AIP Publishing ; 2022
    In:  Physics of Fluids Vol. 34, No. 10 ( 2022-10-01)
    Details
    In: Physics of Fluids, AIP Publishing, Vol. 34, No. 10 ( 2022-10-01)
    Abstract: The Richtmyer–Meshkov instability of a heavy fluid layer with reshock is investigated experimentally and theoretically, to reveal the mechanisms of the interfacial instabilities and motions of waves and interfaces under reshock conditions. Three kinds of heavy fluid layers with different thicknesses in unperturbed and perturbed cases are considered, highlighting the effects of initial layer thickness on the interface evolution. A general one-dimensional theory for describing the interaction between unperturbed interfaces and waves under reshock conditions is constructed, which supports the instability analysis and theoretical modeling in the perturbed cases. The perturbed fluid-layer results indicate that as the fluid-layer thickness decreases, the inhibition of squeezing effects on perturbation growth is gradually stronger than the promotion of rarefaction-wave effects on perturbation growth. The whole mixing width of fluid layers after reshock acceleration exhibits an approximately linear growth feature, and the reshocked mixing width growth rate is weakly dependent on the initial layer thickness, which is different from the finding before reshock. The linear amplitude growth of the right interface after reshock is promoted by the interface coupling effects but is still smaller than the prediction of the empirical linear model. When the squeezing effects are weak, the nonlinear model, which considers the modification of rarefaction-wave effects, can well predict the perturbation growth during and after the acceleration stage of rarefaction waves.
    Type of Medium: Online Resource
    ISSN: 1070-6631 , 1089-7666
    URL: Article
    DOI: 10.1063/5.0119355
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 1472743-2
    detail.hit.zdb_id: 241528-8
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    Online Resource
  • 7
    Online Resource
    Online Resource
    Subcritical excitation of zonal flow in drift wave turbulence
    AIP Publishing ; 2022
    In:  Physics of Plasmas Vol. 29, No. 1 ( 2022-01-01)
    Details
    In: Physics of Plasmas, AIP Publishing, Vol. 29, No. 1 ( 2022-01-01)
    Abstract: We report a subcritical excitation mechanism of zonal flow in drift wave turbulence. Employing the reductive perturbation method, it is shown that the evolution of eikonal phase of the drift wave is governed by a KdV-type equation in the (amplitude) modulational stable regime. A phase pulse train then emerges and generates potential vorticity barrier or staircases. The spatial structure of the zonal flow pattern is given analytically.
    Type of Medium: Online Resource
    ISSN: 1070-664X , 1089-7674
    URL: Article
    DOI: 10.1063/5.0067778
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 1179425-2
    detail.hit.zdb_id: 1472746-8
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  • 8
    Online Resource
    Online Resource
    Effect of local and global information on the dynamical interplay between awareness and epidemic transmission in multiplex networks
    AIP Publishing ; 2022
    In:  Chaos: An Interdisciplinary Journal of Nonlinear Science Vol. 32, No. 8 ( 2022-08-01)
    Details
    In: Chaos: An Interdisciplinary Journal of Nonlinear Science, AIP Publishing, Vol. 32, No. 8 ( 2022-08-01)
    Abstract: Recent few years have witnessed a growing interest in exploring the dynamical interplay between awareness and epidemic transmission within the framework of multiplex networks. However, both local and global information have significant impacts on individual awareness and behavior, which have not been adequately characterized in the existing works. To this end, we propose a local and global information controlled spreading model to explore the dynamics of two spreading processes. In the upper layer, we construct a threshold model to describe the awareness diffusion process and introduce local and global awareness information as variables into an individual awareness ratio. In the lower layer, we adopt the classical susceptible-infected-susceptible model to represent the epidemic propagation process and introduce local and global epidemic information into individual precaution degree to reflect individual heterogeneity. Using the microscopic Markov chain approach, we theoretically derive the threshold for epidemic outbreaks. Our findings suggest that the local and global information can motivate individuals to increase self-protection awareness and take more precaution measures, thereby reducing disease infection probability and suppressing the spread of epidemics.
    Type of Medium: Online Resource
    ISSN: 1054-1500 , 1089-7682
    URL: Article
    DOI: 10.1063/5.0092464
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 1150918-1
    detail.hit.zdb_id: 1472677-4
    SSG: 11
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  • 9
    Online Resource
    Online Resource
    Study of pollution accumulation and insulation performance of roof insulators for trains in the coastal environment
    AIP Publishing ; 2023
    In:  AIP Advances Vol. 13, No. 11 ( 2023-11-01)
    Details
    In: AIP Advances, AIP Publishing, Vol. 13, No. 11 ( 2023-11-01)
    Abstract: The excellent insulation performance of roof insulators is crucial to the reliability of operating trains. The complex environment encountered by trains may cause roof insulator insulation failure, thus affecting the normal operation of the train. The field operation experience shows that during the operation of Hainan CRHAF-A trains, partial arcs are generated frequently on the roof insulators and even flashover accidents occur. In addition, the insulation failure probability of the insulators in the coastal environment is higher than that in other areas, and pollution is an important factor leading to lower insulation performance. Therefore, the pollution accumulation characteristics of roof insulators are investigated and analyzed in this paper. The accumulated pollution simulation model is built based on the operating environment of the train, and the electric field, flow field, and pressure field around the roof insulators are simulated. This has important engineering application and economic value for the study of insulator anti-pollution.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/5.0177078
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 2583909-3
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  • 10
    Online Resource
    Online Resource
    An optical tweezer-based microdroplet imaging technology
    AIP Publishing ; 2023
    In:  Nanotechnology and Precision Engineering Vol. 6, No. 3 ( 2023-09-01)
    Details
    In: Nanotechnology and Precision Engineering, AIP Publishing, Vol. 6, No. 3 ( 2023-09-01)
    Abstract: Microspheres can break the diffraction limit and magnify nano-structure imaging, and with its advantages of low cost and label-free operation, microsphere-assisted imaging has become an irreplaceable tool in the life sciences and for precision measurements. However, the tiny size and limited imaging field of traditional solid microspheres cause difficulties when imaging large sample areas. Alternatively, droplets have similar properties to those of microspheres, with large surface curvature and refractive-index difference from the surrounding environment, and they can also serve as lenses to focus light for observation and imaging. Previous work has shown that droplets with controllable size can be generated using an optical tweezer system and can be driven by optical traps to move precisely like solid microspheres. Here, a novel microdroplet-assisted imaging technology based on optical tweezers is proposed that better integrates the generation, manipulation, and utilization of droplets.
    Type of Medium: Online Resource
    ISSN: 1672-6030 , 2589-5540
    URL: Article
    DOI: 10.1063/10.0019602
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 2263462-9
    detail.hit.zdb_id: 2983270-6
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