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  • AIP Publishing  (1,017)
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  • 1
    Online Resource
    Online Resource
    Comparison and analysis of shockwave characteristics between underwater pulsed discharge and metal wire explosion
    AIP Publishing ; 2020
    In:  Physics of Plasmas Vol. 27, No. 3 ( 2020-03-01)
    Details
    In: Physics of Plasmas, AIP Publishing, Vol. 27, No. 3 ( 2020-03-01)
    Abstract: In order to study the difference in energy conversion efficiency of the shockwaves induced by the expansion of the plasma channel generated by underwater metal wire explosion (MWE) and subsonic streamer breakdown discharge (SSBD), a test stand was constructed, and the experimental results were obtained based on the condition that the voltages of the two discharge modes were the same at the time of the formation of plasma channels. The results showed that the peak value of shockwaves induced by the expansion of the channel and the energy conversion efficiency of MWE were much higher than those of SSBD. The reason lies in the difference in the injected power at the formation moment of the plasma channel and the difference in the time distribution of energy deposited into channels.
    Type of Medium: Online Resource
    ISSN: 1070-664X , 1089-7674
    URL: Article
    DOI: 10.1063/1.5140829
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 1472746-8
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  • 2
    Online Resource
    Online Resource
    Influence of plasma channel impedance model on electrohydraulic shockwave simulation
    AIP Publishing ; 2019
    In:  Physics of Plasmas Vol. 26, No. 2 ( 2019-02-01)
    Details
    In: Physics of Plasmas, AIP Publishing, Vol. 26, No. 2 ( 2019-02-01)
    Abstract: The simulation of electrohydraulic shockwaves is the key technology for their application and device design. The analytical approach of underwater pulsed discharge is described using the dimensionless analysis method, which combines energy based hydrodynamic equations and the electrical differential equation describing the discharge characteristics of the circuit. A constant plasma channel impedance model based on the experimental results and an improved time-varying plasma channel impedance model based on the Braginskii equation are proposed and presented. The plasma channel impedance has a great influence on the deposited energy into the plasma channel and then affects the calculation and analysis of the shockwave propagation. The electrical characteristics and fluid physical properties are taken into consideration, and the results are compared. The application range of different impedance models is summarized, and the time-varying impedance model can provide a more accurate result in the simulation of shockwave propagation. The dimensionless analysis method, together with a time-varying impedance model, could be a useful tool for evaluation of the electrohydraulic shockwave in practical applications and applied physics research of underwater spark discharge.
    Type of Medium: Online Resource
    ISSN: 1070-664X , 1089-7674
    URL: Article
    DOI: 10.1063/1.5064847
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 1472746-8
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  • 3
    Online Resource
    Online Resource
    Characteristic analysis of plasma channel and shock wave in electrohydraulic pulsed discharge
    AIP Publishing ; 2019
    In:  Physics of Plasmas Vol. 26, No. 9 ( 2019-09-01)
    Details
    In: Physics of Plasmas, AIP Publishing, Vol. 26, No. 9 ( 2019-09-01)
    Abstract: Electrohydraulic pulsed discharge has been widely adopted in the industrial field over the decades. The proper description of the plasma channel and the induced shock wave contributes to the development of the technology. Experiments were carried out under different voltages and conductivities. The optical pictures were captured using a high-speed camera. The radii of the plasma channel were calculated using cylindrical approximation and spherical approximation, respectively. The results of the calculation have been verified by comparing the measured and calculated radii. The shock wave intensity can be properly calculated using the piston model in the accelerated expansion phase. It provides a better understanding of energy efficiency under different breakdown voltages. In addition, the oscillation of the cavity under different water conductivities was also recorded and compared. The water conductivity has an obvious effect on the maximum volume by changing energy consumption.
    Type of Medium: Online Resource
    ISSN: 1070-664X , 1089-7674
    URL: Article
    DOI: 10.1063/1.5092362
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 1472746-8
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  • 4
    Online Resource
    Online Resource
    Catalytic pyrolysis of biodiesel surrogate over HZSM-5 zeolite catalyst
    AIP Publishing ; 2021
    In:  Chinese Journal of Chemical Physics Vol. 34, No. 1 ( 2021-02-01), p. 102-111
    Details
    In: Chinese Journal of Chemical Physics, AIP Publishing, Vol. 34, No. 1 ( 2021-02-01), p. 102-111
    Abstract: To obtain insight into the catalytic reaction mechanism of biodiesels over ZSM-5 zeolites, the pyrolysis and catalytic pyrolysis of methyl butanoate, a biodiesel surrogate, with H-type ZSM-5 (HZSM-5) were performed in a flow re-actor under atmospheric pressure. The pyrolysis products were identified and quantified using gas chromatography-mass spectrometry (GC-MS). Kinetic modelling and experimental results revealed that H-atom abstraction in the gas phase was the primary pathway for methyl butanoate decomposition during pyrolysis, but dissociating to ketene and methanol over HZSM-5 was the primary pathway for methyl butanoate consumption during catalytic pyrolysis. The initial decomposition temperature of methyl butanoate was reduced by approximately 300 K over HZSM-5 compared to that for the uncatalyzed reaction. In addition, the apparent activation energies of methyl butanoate under catalytic pyrolysis and homogeneous pyrolysis conditions were obtained using the Arrhenius equation. The significantly reduced apparent activation energy confirmed the catalytic performance of HZSM-5 for methyl butanoate pyrolysis. The activation temperature may also affect some catalytic properties of HZSM-5. Overall, this study can be used to guide subsequent catalytic combustion for practical biodiesel fuels.
    Type of Medium: Online Resource
    ISSN: 1674-0068 , 2327-2244
    URL: Article
    DOI: 10.1063/1674-0068/cjcp2004043
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 2381472-X
    SSG: 6,25
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  • 5
    Online Resource
    Online Resource
    Time-resolved measurements on reflectivity of an ultrafast laser-induced plasma mirror
    AIP Publishing ; 2009
    In:  Physics of Plasmas Vol. 16, No. 10 ( 2009-10-01)
    Details
    In: Physics of Plasmas, AIP Publishing, Vol. 16, No. 10 ( 2009-10-01)
    Abstract: Using a linearly chirped laser pulse to irradiate antireflection coated targets, the time-varying reflectivity of a plasma mirror (PM) has been measured at various laser intensities from 1012 to 1017 W/cm2. The onset of plasma generation as well as the formation process of a PM with the highest reflectivity has been observed. The rise time of the PM’s reflectivity reaching up to the maximum varies from 300–500 fs at lower laser intensities but goes up to 900 fs at higher intensity of & gt;1016 W/cm2. This long rise time can be attributed to a slowly rising shoulder of the laser pulse, which will trigger the generation of preplasma well in advance of the laser peak. The detailed measurements on both time-integrated and time-resolved reflectivity of a PM, which is induced by p- and s-polarized laser pulses, respectively, indicate that an s-polarized pulse is favorable to obtain the maximal reflectivity and the best contrast improvement as well. This difference can be attributed to the weaker absorption and a smaller plasma scale length generated for s-polarization.
    Type of Medium: Online Resource
    ISSN: 1070-664X , 1089-7674
    URL: Article
    DOI: 10.1063/1.3247865
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2009
    detail.hit.zdb_id: 1472746-8
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  • 6
    Online Resource
    Online Resource
    A spectroscopic study of the mechanism of Au(III) (hydro-)oxides in promoting plasmon-mediated photoelectrochemical water-oxidation
    AIP Publishing ; 2023
    In:  The Journal of Chemical Physics Vol. 158, No. 15 ( 2023-04-21)
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 158, No. 15 ( 2023-04-21)
    Abstract: To understand the roles of Au(III) (hydro-)oxides in promoting plasmon-mediated photoelectrochemical (PMPEC) water-oxidation, we employed in situ microphotoelectrochemical surface-enhanced Raman spectroscopy and ambient-pressure x-ray photoelectron spectroscopy to elucidate the correlations between the amount of surface Au(III) (hydro-)oxides and the photocurrent of PMPEC water-oxidation on Au. By applying preoxidation potentials, we made surface Au(III) (hydro-)oxides on a plasmonic Au photoanode. According to the charge of reductively stripping surface oxygenated species before and after PMPEC water-oxidation, we found that a negative shift of an onset potential, increase in photocurrent, and much less growth of surface (hydro-)oxides were correlated with each other as a result of the increase in the coverage of Au (III) (hydro-)oxides. These results suggest that the surface Au(III) (hydro-)oxides kinetically promoted water-oxidation by restricting the growth of surface (hydro-)oxides.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/5.0138672
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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  • 7
    Online Resource
    Online Resource
    Angular and energy distribution of fast electrons emitted from a solid surface irradiated by femtosecond laser pulses in various conditions
    AIP Publishing ; 2010
    In:  Physics of Plasmas Vol. 17, No. 2 ( 2010-02-01)
    Details
    In: Physics of Plasmas, AIP Publishing, Vol. 17, No. 2 ( 2010-02-01)
    Abstract: Angular and energy distributions of fast electrons generated from the interaction of 60 fs, 795 nm laser pulses with aluminum targets have been experimentally investigated in various conditions. Increasing laser intensities from the nonrelativistic to the relativistic, a transition of the angular distribution of outgoing fast electrons from the specular reflection direction to the target normal has been observed for p-polarized laser irradiation. The fast electrons’ energy spectrum at high laser intensity, e.g., ∼2.6×1018 W/cm2, consists of two peaks, which are found to originate from the target normal with low energy and specular reflection direction with high energy, respectively. By adding a prepulse to generate preplasma, the electron yields at the direction of the reflected laser can be greatly enhanced, and a double-peak angular distribution is observed. Besides, a more collimated electron emission peak in the specular reflection direction can be obtained by employing a larger f-number focusing system.
    Type of Medium: Online Resource
    ISSN: 1070-664X , 1089-7674
    URL: Article
    DOI: 10.1063/1.3299363
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2010
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  • 8
    Online Resource
    Online Resource
    Analysis of shock wave induced by underwater pulsed discharge using discharge current interception
    AIP Publishing ; 2020
    In:  Journal of Applied Physics Vol. 127, No. 14 ( 2020-04-14)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 127, No. 14 ( 2020-04-14)
    Abstract: Electrohydraulic shock wave (EHSW) is seemingly one of the simplest and most common products of microsecond pulsed discharge (μsPD) in water; however, its generation process remains far less clear. To study the influence of current waveforms on the generation of an EHSW, we conducted discharge current interception experiments using a bypass branch in the circuit. The current interception time Δt is properly controlled so that the discharge current through the water gap can be terminated at a chosen time. Results show that the peak pressure Pm is first linearly increasing with Δt, and then Pm reaches a stable value. The expansion of the spark channel with increasing velocities will enhance the peak pressure. This phase can be regarded as the accelerated expansion phase (AEP) of the piston theory. The transition area of the Pm–Δt relationship of this experimental setup shows that the AEP lasts for about tm = 5 μs. After the AEP, the deposited energy will help to maintain a higher pressure in the falling edge of the pressure waves. The full width at half maximum of the waveforms finally approaches 12.5 μs in our tests. The experimental results provide evidence of the piston theory in interpreting the generation of EHSW induced by μsPD.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.5143080
    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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  • 9
    Online Resource
    Online Resource
    Improved one-dimensional “piston” model of electrohydraulic shock wave based on discharge current interception
    AIP Publishing ; 2021
    In:  Journal of Applied Physics Vol. 130, No. 9 ( 2021-09-07)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 130, No. 9 ( 2021-09-07)
    Abstract: Based on the pulsed current interception of underwater discharge, the characteristics of the steepness of electrohydraulic shock waves (EHSWs) and the peak value still increasing slowly with the electrical energy injection after the acceleration expansion phase of the plasma channel are investigated. The one-dimensional “piston” model of the EHSW generation is improved, and the calculation method for the EHSWs based on the “piston” model is modified. The modified model takes the change of starting points and the rising steepness of EHSWs into account, and the rising edge and peak value of EHSWs can be calculated more precisely.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/5.0051267
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 10
    Online Resource
    Online Resource
    Rapid and ultrasensitive detection of mpox virus using CRISPR/Cas12b-empowered graphene field-effect transistors
    AIP Publishing ; 2023
    In:  Applied Physics Reviews Vol. 10, No. 3 ( 2023-09-01)
    Details
    In: Applied Physics Reviews, AIP Publishing, Vol. 10, No. 3 ( 2023-09-01)
    Abstract: Mpox is an infectious viral disease, and, as of January 12, 2023, about 84 560 distinct cases have been detected, involving about 110 countries since May 2022. Most clustered regularly interspaced short palindromic repeat (CRISPR)-based detection methods require long assay time because of the pre-amplification to target nucleic acids. Herein, we designed a new prototypal mpox biosensor that allows amplification-free nucleic acid detection by combining CRISPR/Cas12b system and ultrasensitive graphene field-effect transistor (gFET). The CRISPR/Cas12b–gFET enabled the detection of the mpox virus (MPXV) DNA targets at a sensitivity of ∼1 aM within about 20 min. We designed several sgRNAs to recognize the target genes of MPXV and then Cas12b protein cleaved the target genes to form a double-strand break. The specificity of sgRNAs of MPXV designed was verified among other homologous Orthopoxviruses, and the sgRNA could distinguish between recent 2022 MPXV and West African MPXV with the mutation site, showing its potential application in MPXV detection. Thus, the demonstrated CRISPR–gFET detection technology could serve as a sensitive and rapid diagnostic tool for MPXV and other DNA viruses in the future.
    Type of Medium: Online Resource
    ISSN: 1931-9401
    URL: Article
    DOI: 10.1063/5.0142494
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 2265524-4
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