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  • AIP Publishing  (116)
  • 2015-2019  (116)
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  • AIP Publishing  (116)
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  • 2015-2019  (116)
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  • 1
    Online Resource
    Online Resource
    Nonvolatile data storage using mechanical force-induced polarization switching in ferroelectric polymer
    AIP Publishing ; 2015
    In:  Applied Physics Letters Vol. 106, No. 4 ( 2015-01-26)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 106, No. 4 ( 2015-01-26)
    Abstract: Ferroelectric polymers offer the promise of low-cost and flexible electronic products. They are attractive for information storage due to their spontaneous polarization which is usually switched by electric field. Here, we demonstrate that electrical signals can be readily written on ultra-thin ferroelectric polymer films by strain gradient-induced polarization switching (flexoelectric effect). A force with magnitude as small as 64nN is enough to induce highly localized (40 nm feature size) change in the polarization states. The methodology is capable of realizing nonvolatile memory devices with miniaturized cell size and storage density of tens to hundreds Gbit per square inch.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4906859
    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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  • 2
    Online Resource
    Online Resource
    Ultrafast multidimensional nuclear magnetic resonance technique: A proof of concept based on inverse- k -space for convenient and efficient performance
    AIP Publishing ; 2016
    In:  Applied Physics Letters Vol. 108, No. 8 ( 2016-02-22)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 108, No. 8 ( 2016-02-22)
    Abstract: Ultrafast multidimensional nuclear magnetic resonance (NMR) technique serves as an important and powerful tool for analyzing chemical and biological systems. Here, we propose an inverse-k-space along with a systematic processing strategy to improve quality of the ultrafast spectrum in terms of lineshape, signal-to-noise ratio, and adaptability to magnetic-field inhomogeneity. Experiments on phantom solutions and a chemical reaction system were performed to validate the effectiveness of inverse-k-space in enhancing the spectral quality of ultrafast technique. On the basis of its versatility, the inverse-k-space will facilitate applications of multidimensional NMR spectra in the rapid characterization of homogeneous chemical systems as well as in the real-time detection of inhomogeneous reaction systems.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4942504
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2016
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 3
    Online Resource
    Online Resource
    Accelerating two-dimensional nuclear magnetic resonance correlation spectroscopy via selective coherence transfer
    AIP Publishing ; 2017
    In:  The Journal of Chemical Physics Vol. 146, No. 1 ( 2017-01-07)
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 146, No. 1 ( 2017-01-07)
    Abstract: Nuclear magnetic resonance (NMR) spectroscopy serves as an important tool for both qualitative and quantitative analyses of various systems in chemistry, biology, and medicine. However, applications of one-dimensional 1H NMR are often restrained by the presence of severe overlap among different resonances. The advent of two-dimensional (2D) 1H NMR constitutes a promising alternative by extending the crowded resonances into a plane and thereby alleviating the spectral congestions. However, the enhanced ability in discriminating resonances is achieved at the cost of extended experimental duration due to necessity of various scans with progressive delays to construct the indirect dimension. Therefore, in this study, we propose a selective coherence transfer (SECOT) method to accelerate acquisitions of 2D correlation spectroscopy by converting chemical shifts into spatial positions within the effective sample length and then performing an echo planar spectroscopic imaging module to record the spatial and spectral information, which generates 2D correlation spectrum after 2D Fourier transformation. The feasibility and effectiveness of SECOT have been verified by a set of experiments under both homogeneous and inhomogeneous magnetic fields. Moreover, evaluations of SECOT for quantitative analyses are carried out on samples with a series of different concentrations. Based on these experimental results, the SECOT may open important perspectives for fast, accurate, and stable investigations of various chemical systems both qualitatively and quantitatively.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/1.4973547
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2017
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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    Online Resource
  • 4
    Online Resource
    Online Resource
    Effect of supersonic molecular beam injection deposition on edge localized mode mitigation in the HL-2A H-mode plasmas
    AIP Publishing ; 2016
    In:  Physics of Plasmas Vol. 23, No. 1 ( 2016-01-01)
    Details
    In: Physics of Plasmas, AIP Publishing, Vol. 23, No. 1 ( 2016-01-01)
    Abstract: The ELM (edge localized mode) mitigation by SMBI (supersonic molecular beam injection) has been studied in the HL-2A H-mode plasmas. The ELM mitigation effect and its relationship with the deposition position of SMBI in the H-mode pedestal are reported for the first time experimentally. We found that when the deposition of SMBI is about 20% into the pedestal, the best ELM mitigation effect is achieved, which is identified by a significant increase of the ELM frequency and also a decrease of the ELM amplitude. The theoretical inference that no deep injection is needed is confirmed. The sand-pile model is used to simulate the ELM burst and explain the mitigation effect for different SMBI deposited positions. It is found that the gradient threshold is a key parameter in the process of the ELM mitigation, and there should be a local gradient threshold in the middle of the pedestal. When the deposition of SMBI is close to the edge of this region, the best ELM mitigation effect can be observed.
    Type of Medium: Online Resource
    ISSN: 1070-664X , 1089-7674
    URL: Article
    DOI: 10.1063/1.4940940
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2016
    detail.hit.zdb_id: 1472746-8
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  • 5
    Online Resource
    Online Resource
    Influences of point defects on electrical and optical properties of InGaN light-emitting diodes at cryogenic temperature
    AIP Publishing ; 2018
    In:  Journal of Applied Physics Vol. 123, No. 16 ( 2018-04-28)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 123, No. 16 ( 2018-04-28)
    Abstract: We investigate the cryogenic external quantum efficiency (EQE) for some InGaN light-emitting diodes with different indium contents. We observe a monotonic decrease in EQE with the increasing forward current before the “U-turn” point, beyond which the thermal effect increases the EQE. We discover positive dependences among the droop rate (χ), differential electrical resistance (Rd), and indium content. Also, χ and Rd of individual green samples shift correspondingly during the aging test, when the Mg ions are activated at high injection density and diffuse into the active region. Considering the fact that both In and Mg ions would introduce point defects (PDs), we proposed a model that reveals the mechanism of interplay between PDs and carriers. PDs serve as both energy traps and non-radiative recombination centers. They attract and confine carriers, leading to an increase in Rd and a decrease in EQE.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.4989595
    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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    Online Resource
  • 6
    Online Resource
    Online Resource
    Enhancement of emission of InGaN/GaN multiple-quantum-well nanorods by coupling to Au-nanoparticle plasmons
    AIP Publishing ; 2018
    In:  Journal of Applied Physics Vol. 123, No. 19 ( 2018-05-21)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 123, No. 19 ( 2018-05-21)
    Abstract: We demonstrate the enhancement of emission of InGaN/GaN multiple-quantum-well nanorods by nearly a factor of 2 by coupling them to localized surface plasmons of Au nano-particles (NPs). The Au NPs are fabricated in situ on the nanorods using a Ni/SiO2/Au/SiNx compound functional layer. This layer serves as a combination dry-etch mask for fabricating the nanorods and the Au NPs, as well as providing isolation necessary to prevent fluorescence quenching. Time-resolved photoluminescence measurements confirm that emission enhancement originates from the coupling.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.5022454
    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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  • 7
    Online Resource
    Online Resource
    An active Bonner sphere spectrometer capable of intense neutron field measurement
    AIP Publishing ; 2019
    In:  Applied Physics Letters Vol. 114, No. 23 ( 2019-06-10)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 114, No. 23 ( 2019-06-10)
    Abstract: A Bonner sphere spectrometer (BSS) was developed compensating for the lack of active BSSs for intense neutron field characterization. The spectrometer combines the merits of present active and passive BSSs, namely, online data acquisition capability and intense neutron field resistance, respectively. The key elements of the development are the utilization of diamond detectors as thermal neutron sensors of BSSs and the incorporation of the air gap into the design of the diamond detector for optimizing the pulse height spectrum in order to enhance the rejection capability to γ ray backgrounds and to decrease the impacts of spectrometer instabilities. A two-step method capable of & gt;100 times of calculation time saving compared to the whole geometry model was suggested to establish the response function for neutrons below 20 MeV whose reliability was verified by the two other models. The applicability of the BSS to intense neutron field characterization was demonstrated by the good performance in the Experimental Advanced Superconducting Tokamak (EAST) neutron field with an emission rate of ∼1013–1014 neutrons/s. The spectrometer is dedicated to the characterization of intense neutron fields around tokamaks. These devices may find an application in future tokamaks, such as the International Thermonuclear Experimental Reactor, the Demonstration Power Station, and the China Fusion Engineering Test Reactor, whose neutron emission rates will be & gt;104 times higher than those of current tokamaks.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.5096191
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 8
    Online Resource
    Online Resource
    Design and construction of a novel instrument for high-frequency micro-force electrical sliding friction testing
    AIP Publishing ; 2019
    In:  Review of Scientific Instruments Vol. 90, No. 9 ( 2019-09-01)
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 90, No. 9 ( 2019-09-01)
    Abstract: Sliding electrical contact exists in various electrical equipment. However, its performance is significantly affected by the sliding condition such as the load, electricity, and the surface state of friction pairs. In this study, a novel instrument is designed and constructed for high-frequency microforce electrical sliding friction testing. The new instrument provides a unique experimental platform that enables high-frequency reciprocating friction and microforce loading, and it has an innovative data collection system that includes a cantilever beam structure to measure the microforce. In this instrument, parameters (positive force, friction, displacement, and voltage of frictional pair) are obtained and monitored in real time. The steel sheet and nickel-plated steel wire were used as materials to conduct an experiment, and the steel sheet morphology after the experiment was observed using a light microscope. Results show that the voltage and positive load significantly influence the friction coefficient and friction wear, which is crucial in understanding friction and wear behaviors.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/1.5111449
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
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  • 9
    Online Resource
    Online Resource
    Line broadening interference for high-resolution nuclear magnetic resonance spectra under inhomogeneous magnetic fields
    AIP Publishing ; 2015
    In:  The Journal of Chemical Physics Vol. 142, No. 13 ( 2015-04-07)
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 142, No. 13 ( 2015-04-07)
    Abstract: Nuclear magnetic resonance spectroscopy serves as an important tool for analyzing chemicals and biological metabolites. However, its performance is subject to the magnetic-field homogeneity. Under inhomogeneous fields, peaks are broadened to overlap each other, introducing difficulties for assignments. Here, we propose a method termed as line broadening interference (LBI) to provide high-resolution information under inhomogeneous magnetic fields by employing certain gradients in the indirect dimension to interfere the magnetic-field inhomogeneity. The conventional spectral-line broadening is thus interfered to be non-diagonal, avoiding the overlapping among adjacent resonances. Furthermore, an inhomogeneity correction algorithm is developed based on pattern recognition to recover the high-resolution information from LBI spectra. Theoretical deductions are performed to offer systematic and detailed analyses on the proposed method. Moreover, experiments are conducted to prove the feasibility of the proposed method for yielding high-resolution spectra in inhomogeneous magnetic fields.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/1.4916520
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2015
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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  • 10
    Online Resource
    Online Resource
    Phonon wave interference in graphene and boron nitride superlattice
    AIP Publishing ; 2016
    In:  Applied Physics Letters Vol. 109, No. 2 ( 2016-07-11)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 109, No. 2 ( 2016-07-11)
    Abstract: The thermal transport properties of the graphene and boron nitride superlattice (CBNSL) are investigated via nonequilibrium molecular dynamics simulations. The simulation results show that a minimum lattice thermal conductivity can be achieved by changing the period length of the superlattice. Additionally, it is found that the period length at the minimum shifts to lower values at higher temperatures, and that the depth of the minimum increases with decreasing temperature. In particular, at 200 K, the thermal conductivities of CBNSLs with certain specific period lengths are nearly equal to the corresponding values at 300 K. A detailed analysis of the phonon spectra shows that this anomalous thermal conductivity behavior is a result of strong phonon wave interference. These observations indicate a promising strategy for manipulation of thermal transport in superlattices.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4958688
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2016
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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