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  • AIP Publishing  (418)
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  • AIP Publishing  (418)
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  • 1
    Online Resource
    Online Resource
    Microscopic mechanism for the effect of adding salt on electrospinning by molecular dynamics simulations
    AIP Publishing ; 2014
    In:  Applied Physics Letters Vol. 105, No. 12 ( 2014-09-22)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 105, No. 12 ( 2014-09-22)
    Abstract: Adding salts into polymer solution has been found to modulate the fiber structure and significantly improve the solution spinnability in electrospinning. However, the mechanisms have not been fully understood. This work adopted molecular dynamics method to investigate the dynamic behavior of poly(ethylene oxide) (PEO)/water droplet with or without dissolved NaCl salt under high-voltage electric field. Our simulation results agreed with the previous experimental reports well. We observed that some daughter droplets detach from the mother droplet due to the ions evaporation and hydration effect, which significantly accelerates the water evaporation and hence improves the solution spinnability. We also observed that some sodium ions are always coordinated with the ether oxygen group in the PEO chain. When these ions are accelerated by the electric field, the PEO chain segments follow the motion of the ions, inevitably stretching the chain and improving the fiber morphology.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4896690
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2014
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 2
    Online Resource
    Online Resource
    Large electroluminescence excitation cross section and strong potential gain of erbium in ErYb silicate
    AIP Publishing ; 2013
    In:  Journal of Applied Physics Vol. 113, No. 10 ( 2013-03-14)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 113, No. 10 ( 2013-03-14)
    Abstract: 1.53 μm electroluminescence of erbium was observed in ErYb silicate metal-insulator-silicon light emitting device (MISLED). The erbium ions were excited by direct impact of hot carriers at electric field higher than 7 MV/cm. The conduction and carrier injection mechanisms were investigated. The impact excitation cross section of Er ions was measured to be 3 × 10−14 cm2, three times of Er-doped SiO2 MISLED. Rate equation modeling suggests that strong potential material's gain of more than 23 dB/cm from the ErYb silicate may be achieved by electrical pumping.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.4795153
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2013
    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
    A binary sampling Res2net reconstruction network for single-pixel imaging
    AIP Publishing ; 2020
    In:  Review of Scientific Instruments Vol. 91, No. 3 ( 2020-03-01)
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 91, No. 3 ( 2020-03-01)
    Abstract: The traditional algorithm for compressive reconstruction has high computational complexity. In order to reduce the reconstruction time of compressive sensing, deep learning networks have proven to be an effective solution. In this paper, we have developed a single-pixel imaging system based on deep learning and designed the binary sampling Res2Net reconstruction network (Bsr2-Net) model suitable for binary matrix sampling. In the experiments, we compared the structural similarity, peak signal-to-noise ratio, and reconstruction time using different reconstruction methods. Experimental results show that the Bsr2-Net is superior to several deep learning networks recently reported and closes to the most advanced reconstruction algorithms.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/1.5137817
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
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    Online Resource
  • 4
    Online Resource
    Online Resource
    Semiconductor up-converter based on cascade carrier transport for infrared detection/imaging
    AIP Publishing ; 2015
    In:  Applied Physics Letters Vol. 107, No. 13 ( 2015-09-28)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 107, No. 13 ( 2015-09-28)
    Abstract: The next generation infrared (IR) detection and imaging technology calls for very large-scale IR sensitive chips with non-compromised performance. IR up-converters based on mature III-V semiconductors are thought to be quite promising candidates. However, the up-converters and the corresponding up-conversion systems so far substantially fall behind traditional IR detectors in terms of device performance due to the more serious trade-off between responsivity and dark current. In this article, a cascade infrared up-converter (CIUP) is proposed. By employing cascade carrier transport, IR responsivity can be enhanced while dark current remains in fairly low level. For the fabricated 4-μm InGaAs/AlGaAs CIUP under 3.3 V at 78 K, the up-conversion efficiency of the system is 2.1 mW/W under 2.1 μW mid-infrared input. Both the up-converter and the up-conversion system are under background-limited infrared performance regime below 120 K. Taking shot noise as the main source of system noise, the CIUP system displays a higher detectivity than previous semiconductor up-converters at similar wavelengths, and thus possesses greater potential for future large-scale IR detection and imaging applications.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4932116
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2015
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 5
    Online Resource
    Online Resource
    Magneto-optical visualization of vortices penetration into Ba(Fe1.8Co0.2)As2
    AIP Publishing ; 2010
    In:  Journal of Applied Physics Vol. 107, No. 9 ( 2010-05-01)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 107, No. 9 ( 2010-05-01)
    Abstract: Vortices penetration into oxygen-free superconducting compounds FeAs-122 system is of interest in understanding superconductivity. This work studies the vortices motion in Ba(Fe1.8Co0.2)As2 single crystal by means of magneto-optical imaging technique in zero field cooled and field cooled conditions. The captured magneto-optical images and corresponding flux profiles show that, at zero field cooled condition, vortices penetrate into the crystal from the edges as external magnetic field increases. A vortices-free region is observed at the center of sample as applied field is less than full penetration field. In field cooled condition, the introduced vortices leave the sample at the edges as field decreases and polarization of the vortices at the edges are opposite as decreasing field approaches to zero. The pinning strength decreases with increasing temperature. The observed vortex behavior is very similar to that in high Tc superconducting materials with strong pinning strength.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.3366608
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2010
    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
    Letter: The effects of streamwise system rotation on pressure fluctuations in a turbulent channel flow
    AIP Publishing ; 2018
    In:  Physics of Fluids Vol. 30, No. 9 ( 2018-09-01)
    Details
    In: Physics of Fluids, AIP Publishing, Vol. 30, No. 9 ( 2018-09-01)
    Abstract: In this letter, we report the modulating effects of streamwise system rotation on both the amplitude and the wavenumber of pressure fluctuations in a plane channel flow. The analysis of the pressure field is conducted based on a set of comprehensive direct numerical simulation data of six rotation numbers. It is observed that high pressure fluctuation regions collocate with the Taylor–Görtler-like (TGL) vortex cores. By decomposing the pressure field into rotation-induced and convection-induced parts, it is observed that the rotation-induced part dominates the total pressure fluctuations and facilitates the growth of TGL vortices. Furthermore, through a spectral analysis, it is discovered that the system rotation acts as a “linear amplifier,” which converts high-wavenumber low-amplitude streamwise vorticity fluctuations into low-wavenumber high-amplitude pressure fluctuations.
    Type of Medium: Online Resource
    ISSN: 1070-6631 , 1089-7666
    URL: Article
    DOI: 10.1063/1.5048800
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2018
    detail.hit.zdb_id: 1472743-2
    detail.hit.zdb_id: 241528-8
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  • 7
    Online Resource
    Online Resource
    Discoveries on the link between the properties of thermoelectric and infrared radiation
    AIP Publishing ; 2023
    In:  Applied Physics Letters Vol. 123, No. 13 ( 2023-09-25)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 123, No. 13 ( 2023-09-25)
    Abstract: Both thermoelectric conversion materials and infrared (IR) radiation materials enjoy broad applicability in energy utilization and aerospace. Therefore, it is essential to study the relationship between the physical properties of these two materials. This paper investigates the connection between the thermoelectric properties and the IR radiation properties using a SrTiO3-based thermoelectric material. As a result, we have demonstrated the correlation between a material's Seebeck coefficient and IR emissivity using experimental data and theoretical calculations. With increasing Seebeck coefficient, the IR emissivity increases. The material's IR emissivity falls as its electrical conductivity rises, and vice versa. When the material's thermal gradient is low, its IR emissivity influences its IR radiation energy. As the thermal gradient of the material increases, the IR radiation energy incident on the material surface is mainly influenced by the material's thermal conductivity. This work provides a fresh perspective on modulating the IR radiation and thermoelectric properties using the connection found in this study. The results provide theoretical guidance for studies at the intersection of thermoelectric and IR materials.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0171110
    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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  • 8
    Online Resource
    Online Resource
    Fully integrated InGaAs/InP single-photon detector module with gigahertz sine wave gating
    AIP Publishing ; 2012
    In:  Review of Scientific Instruments Vol. 83, No. 8 ( 2012-08-01)
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 83, No. 8 ( 2012-08-01)
    Abstract: InGaAs/InP single-photon avalanche diodes (SPADs) working in the regime of GHz clock rates are crucial components for the high-speed quantum key distribution (QKD). We have developed for the first time a compact, stable, and user-friendly tabletop InGaAs/InP single-photon detector system operating at a 1.25 GHz gate rate that fully integrates functions for controlling and optimizing SPAD performance. We characterize the key parameters of the detector system and test the long-term stability of the system for continuous operation of 75 h. The detector system can substantially enhance QKD performance and our present work paves the way for practical high-speed QKD applications.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/1.4746291
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2012
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
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  • 9
    Online Resource
    Online Resource
    Writable spin wave nanochannels in an artificial-spin-ice-mediated ferromagnetic thin film
    AIP Publishing ; 2022
    In:  Applied Physics Letters Vol. 120, No. 13 ( 2022-03-28)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 120, No. 13 ( 2022-03-28)
    Abstract: Magnonics, which employs spin-waves to transmit and process information, is a promising venue for low-power data processing. One of the major challenges is the local control of the spin-wave propagation path. Here, we introduce the concept of writable magnonics by taking advantage of the highly flexible reconfigurability and rewritability of artificial spin ice systems. Using micromagnetic simulations, we show that globally switchable spin-wave propagation and locally writable spin-wave nanochannels can be realized in a ferromagnetic thin film underlying an artificial pinwheel spin ice. The rewritable magnonics enabled by reconfigurable spin wave nanochannels provides a unique setting to design programmable magnonic circuits and logic devices for ultra-low power applications.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0085455
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 10
    Online Resource
    Online Resource
    Tailoring magnetization reversal of a single-domain bar nanomagnet via its end geometry
    AIP Publishing ; 2021
    In:  AIP Advances Vol. 11, No. 4 ( 2021-04-01)
    Details
    In: AIP Advances, AIP Publishing, Vol. 11, No. 4 ( 2021-04-01)
    Abstract: Nanoscale single-domain bar magnets are building blocks for a variety of fundamental and applied mesoscopic magnetic systems, such as artificial spin ices, magnetic shape-morphing microbots, and magnetic majority logic gates. The magnetization reversal switching field of the bar nanomagnets is a crucial parameter that determines the physical properties and functionalities of their constituted artificial systems. Previous methods on tuning the magnetization reversal switching field of a bar nanomagnet usually relied on modifying its aspect ratio, such as its length, width, and/or thickness. Here, we show that the switching field of a bar nanomagnet saturates when extending its length beyond a certain value, preventing further tailoring of the magnetization reversal via aspect ratios. We showcase a highly tunable switching field of a bar nanomagnet by tailoring its end geometry without altering its size. This provides an easy method to control the magnetization reversal of a single-domain bar nanomagnet. It would enable new research and/or applications, such as designing artificial spin ices with additional tuning parameters, engineering magnetic microbots with more flexibility, and developing magnetic quantum-dot cellular automata systems for low power computing.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/5.0041220
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 2583909-3
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