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  • AIP Publishing  (26)
  • 1
    Online Resource
    Online Resource
    The effect of humidity on the discharge mode transition of air discharge plasma
    AIP Publishing ; 2022
    In:  Physics of Plasmas Vol. 29, No. 9 ( 2022-09-01)
    Details
    In: Physics of Plasmas, AIP Publishing, Vol. 29, No. 9 ( 2022-09-01)
    Abstract: Cold atmospheric plasma in air commonly operates in the O3 mode and NOx mode, which easily interconvert through a transition mode, depending on discharge conditions. Given that the humidity varies considerably in different weather, it is important to elucidate the effect of humidity on the discharge mode transition, but few studies have been reported thus far. In this study, air plasmas were generated by a surface dielectric barrier discharge with different discharge powers of 6, 9, and 12 W, and the relative humidity of air was controlled at 1.5% (dry air), 40%, or 80% for a comparative study. It was found that an increase in humidity suppressed the production of O3 but promoted that of NO2 when the discharge power was 6 W, whereas it promoted the production of O3 but suppressed that of NO2 when the discharge power was 12 W. This implies that air humidity could have a bidirectional effect on the discharge mode transition, which was validated by experiments with a moderate power of 9 W. In that case, the discharge in dry air maintained the transition mode at a quasi-stable state, but it transited either into the NOx mode when the humidity was 40% or into the O3 mode when the humidity was 80%. A competition between reaction pathways dominated by N2(ν) or water-originated compounds may be the cause, and our findings indicate that the effect of humidity should be taken seriously in the research and development of air discharge plasmas.
    Type of Medium: Online Resource
    ISSN: 1070-664X , 1089-7674
    URL: Article
    DOI: 10.1063/5.0107803
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 1472746-8
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  • 2
    Online Resource
    Online Resource
    Accelerated reconstruction of electrical impedance tomography images via patch based sparse representation
    AIP Publishing ; 2016
    In:  Review of Scientific Instruments Vol. 87, No. 11 ( 2016-11-01)
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 87, No. 11 ( 2016-11-01)
    Abstract: Electrical impedance tomography (EIT) reconstruction is a nonlinear and ill-posed problem. Exact reconstruction of an EIT image inverts a high dimensional mathematical model to calculate the conductivity field, which causes significant problems regarding that the computational complexity will reduce the achievable frame rate, which is considered as a major advantage of EIT imaging. The single-step method, state estimation method, and projection method were always used to accelerate reconstruction process. The basic principle of these methods is to reduce computational complexity. However, maintaining high resolution in space together with not much cost is still challenging, especially for complex conductivity distribution. This study proposes an idea to accelerate image reconstruction of EIT based on compressive sensing (CS) theory, namely, CSEIT method. The novel CSEIT method reduces the sampling rate through minimizing redundancy in measurements, so that detailed information of reconstruction is not lost. In order to obtain sparse solution, which is the prior condition of signal recovery required by CS theory, a novel image reconstruction algorithm based on patch-based sparse representation is proposed. By applying the new framework of CSEIT, the data acquisition time, or the sampling rate, is reduced by more than two times, while the accuracy of reconstruction is significantly improved.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/1.4966998
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2016
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
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  • 3
    Online Resource
    Online Resource
    Photoluminescence of GaInP under high pressure
    AIP Publishing ; 1996
    In:  Journal of Applied Physics Vol. 79, No. 9 ( 1996-05-01), p. 7177-7182
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 79, No. 9 ( 1996-05-01), p. 7177-7182
    Abstract: Photoluminescence of GaInP under hydrostatic pressure is investigated. The Γ valley of disordered GaInP shifts sublinearly upwards with respect to the top of the valence band with increasing pressure and this sublinearity is caused by the nonlinear relationship between lattice constant and hydrostatic pressure. The Γ valleys of ordered GaInP rise more slowly than that of the disordered one and the relationship between the band gap and the pressure can not be explained in the same way. Taking into account the interactions between the Γ valley and the folded L valleys, as well as, the X valleys, the experimental pressure dependences of the band gap of ordered GaInP epilayers are calculated and fitted quite well using first order perturbation theory. The results indicate that simultaneous ordering along 〈111〉 and 〈100〉 directions can occur in ordered GaInP.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.361490
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1996
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 4
    Online Resource
    Online Resource
    Impact of contact resistance on the performances of graphene field-effect transistor through analytical study
    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: Currently, owing to its remarkable electro-mechanical, thermal, and optical properties, graphene has attracted tremendous attention in the research community as one of the most prominent materials in modern electronic technology. In recent years, the graphene field-effect transistor (G-FET) has exhibited outstanding radio frequency performance and unprecedented sensitivity. Generally, the contact or parasitic resistance significantly influences the different characteristics of a large area G-FET. In this work, we have determined the effect of contact resistance from different characteristics of a G-FET. We have found that contact or parasitic resistance has a meaningful impact on the device’s different characteristics, i.e., transfer characteristics, transconductance, cut-off frequency, etc. The analytical results have indicated that the transconductance and cut-off frequency of a G-FET decrease significantly with a higher value of contact resistance. Thereafter, reducing contact resistance according to experimental conditions will predict revolutionary changes in fabrication technology for graphene-based devices.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/5.0039622
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 2583909-3
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  • 5
    Online Resource
    Online Resource
    Ordering along 〈111〉 and 〈100〉 directions in GaInP demonstrated by photoluminescence under hydrostatic pressure
    AIP Publishing ; 1996
    In:  Applied Physics Letters Vol. 68, No. 12 ( 1996-03-18), p. 1711-1713
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 68, No. 12 ( 1996-03-18), p. 1711-1713
    Abstract: Photoluminescence of GaInP epilayers under hydrostatic pressure is investigated. The Γ valley of disordered GaInP shifts sublinearly upwards with respect to the top of the valence band with increasing pressure and this sublinearity is caused by the nonlinear dependence of lattice constant on the hydrostatic pressure. The Γ valleys of ordered GaInP epilayers rise slower than that of the disordered one. Considering the interactions between the Γ valley and folded L and X valleys, the pressure dependence of the band gap of ordered GaInP is calculated and fitted. The results demonstrate that not only ordering along 〈111〉 directions but also sometimes simultaneous ordering along 〈111〉 and 〈100〉 directions can occur in ordered GaInP.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.115914
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1996
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 6
    Online Resource
    Online Resource
    Comparison between the water activation effects by pulsed and sinusoidal helium plasma jets
    AIP Publishing ; 2018
    In:  Physics of Plasmas Vol. 25, No. 1 ( 2018-01-01)
    Details
    In: Physics of Plasmas, AIP Publishing, Vol. 25, No. 1 ( 2018-01-01)
    Abstract: Comparisons between pulsed and sinusoidal plasma jets have been extensively reported for the discharge characteristics and gaseous reactive species, but rarely for the aqueous reactive species in water solutions treated by the two types of plasma jets. This motivates us to compare the concentrations of aqueous reactive species induced by a pulsed and a sinusoidal plasma jet, since it is widely reported that these aqueous reactive species play a crucial role in various plasma biomedical applications. Experimental results show that the aqueous H2O2, OH/O2−, and O2−/ONOO− induced by the pulsed plasma jet have higher concentrations, and the proportional difference increases with the discharge power. However, the emission intensities of OH(A) and O(3p5P) are higher for the sinusoidal plasma jet, which may be attributed to its higher gas temperature since more water vapor could participate in the plasma. In addition, the efficiency of bacterial inactivation induced by the pulsed plasma jet is higher than that for the sinusoidal plasma jet, in accordance with the concentration relation of aqueous reactive species for the two types of plasma jets.
    Type of Medium: Online Resource
    ISSN: 1070-664X , 1089-7674
    URL: Article
    DOI: 10.1063/1.5016510
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2018
    detail.hit.zdb_id: 1472746-8
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  • 7
    Online Resource
    Online Resource
    Electrostrictive behavior observed in a low glass-transition temperature photorefractive polymeric composite during a two-beam coupling experiment
    AIP Publishing ; 1998
    In:  Applied Physics Letters Vol. 72, No. 23 ( 1998-06-08), p. 2939-2941
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 72, No. 23 ( 1998-06-08), p. 2939-2941
    Abstract: A movement of refractive index grating was observed in two-beam coupling behavior with a low glass-transition temperature photorefractive polymeric film as the poling electric field was discharged. The photorefractive polymeric composite is poly(N-vinylcarbazole) doped with 2,5-dimethyl-4-(p-nitrophenylazo)anisole, N-ethylcarbazole and 2,4,7-trinitro-9-fluorenone in a weight ratio of 25:40:34:1. A theoretical explanation based on electrostrictive effect was given, and some evidential experiments, including degenerate four-wave mixing and Michelson interference measurement were also presented.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.121500
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1998
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 8
    Online Resource
    Online Resource
    Mechanical behavior of twinned SiC nanowires under combined tension-torsion and compression-torsion strain
    AIP Publishing ; 2010
    In:  Journal of Applied Physics Vol. 108, No. 1 ( 2010-07-01)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 108, No. 1 ( 2010-07-01)
    Abstract: The mechanical behavior of twinned silicon carbide (SiC) nanowires under combined tension-torsion and compression-torsion is investigated using molecular dynamics simulations with an empirical potential. The simulation results show that both the tensile failure stress and buckling stress decrease under combined tension-torsional and combined compression-torsional strain, and they decrease with increasing torsional rate under combined loading. The torsion rate has no effect on the elastic properties of the twinned SiC nanowires. The collapse of the twinned nanowires takes place in a twin stacking fault of the nanowires.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.3456002
    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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  • 9
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    Online Resource
    Induced-charge electrokinetics in rotating electric fields: A linear asymptotic analysis
    AIP Publishing ; 2018
    In:  Physics of Fluids Vol. 30, No. 6 ( 2018-06-01)
    Details
    In: Physics of Fluids, AIP Publishing, Vol. 30, No. 6 ( 2018-06-01)
    Abstract: Concerning the electroconvective analyte manipulation in microfluidics, we describe the basic physics of fluid flow driven by rotating induced-charge electro-osmosis (ROT-ICEO), which occurs on the planar surface of a single floating electrode in an external rotating electric field. First, based on a linear asymptotic analysis, the dynamic flow stagnation line in ROT-ICEO induced on the bipolar electrode from a rotary Debye screening charge revolves synchronously with the applied rotating fields. A net hydrodynamic torque is then generated that acts on any fluid or particle sample to produce either a synchronous or asynchronous co-field rotation depending on the frequency of the ac signal. Next, from the synergy between the hydrodynamic and electrochemical ion relaxations, an analytical solution of the sample rotation rate subject to ROT-ICEO slipping on an ideally polarizable surface is obtained for different frequency ranges and determined by the transient nature of the rotating electro-osmotic flow oscillating at twice the field frequency. To visualize the flow field in ROT-ICEO, experiments were performed with fluorescent tracer nanoparticles; they exhibited concentric rotational behavior at the polarized phase interface. Formed like the arms of a nebula disk, the four twisted tails of nanoparticles can be arbitrarily directed under voltage-phase rectification. These experimental results are in good agreement with our mathematical simulations using the Debye–Hückel approximation on ROT-ICEO.
    Type of Medium: Online Resource
    ISSN: 1070-6631 , 1089-7666
    URL: Article
    DOI: 10.1063/1.5030579
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2018
    detail.hit.zdb_id: 1472743-2
    detail.hit.zdb_id: 241528-8
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  • 10
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    Online Resource
    Global firing rate contrast enhancement in E/I neuronal networks by recurrent synchronized inhibition
    AIP Publishing ; 2018
    In:  Chaos: An Interdisciplinary Journal of Nonlinear Science Vol. 28, No. 10 ( 2018-10-01)
    Details
    In: Chaos: An Interdisciplinary Journal of Nonlinear Science, AIP Publishing, Vol. 28, No. 10 ( 2018-10-01)
    Abstract: Inhibitory synchronization is commonly observed and may play some important functional roles in excitatory/inhibitory (E/I) neuronal networks. The firing rate contrast enhancement is a general feature of information processing in sensory pathways, and a new mechanism of contrast enhancement by inhibitory synchronization in E/I neuronal networks is investigated in this paper. Inspired by the firing rate contrast enhancement phenomenon by the lateral feed-forward inhibition, we reveal that the firing rate contrast enhancement could also occur by recurrent inhibition in E/I networks. It is further found that the synchronized inhibitory neurons act as a global inhibition which can enhance the firing rate contrast of excitatory neurons globally in synchronized E/I networks, even in partially synchronous states. Therefore, the firing rate contrast enhancement might be an important function of inhibitory synchronization and might facilitate information transmission in neural systems.
    Type of Medium: Online Resource
    ISSN: 1054-1500 , 1089-7682
    URL: Article
    DOI: 10.1063/1.5037207
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2018
    detail.hit.zdb_id: 1472677-4
    SSG: 11
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