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  • AIP Publishing  (1,164)
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  • AIP Publishing  (1,164)
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  • 1
    Online Resource
    Online Resource
    Study on the properties of Sn-added YBCO prepared by the powder melting process
    AIP Publishing ; 1994
    In:  Journal of Applied Physics Vol. 76, No. 5 ( 1994-09-01), p. 2954-2959
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 76, No. 5 ( 1994-09-01), p. 2954-2959
    Abstract: Magnetization and magnetic relaxations have been measured for the YBa2Cu2.985Sn0.015Oy and YBa2Cu3Oy superconductors, which were prepared by the powder melting process method. It is found that the Sn-added sample exhibits much higher Jc value and lower flux creep rate than pure YBCO. The results indicate that the melting temperature can be reduced and the pinning potential can be enhanced by substituting Sn for Cu. The Jc value estimated by Bean’s model drops with the magnetic field according to a power law. The dependence of Jc on the reduced temperature and the flux pinning force density behavior is discussed. The dependence on temperature of the maximum demagnetization field Hp and the remanent magnetization Mrem is studied. Finally, we also investigate the microstructure characteristic.  
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.357535
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1994
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 2
    Online Resource
    Online Resource
    Critical current density and magnetic properties of a melt-processed Y0.8Ho0.2Ba2Cu3O y superconductor
    AIP Publishing ; 1993
    In:  Journal of Applied Physics Vol. 74, No. 8 ( 1993-10-15), p. 5096-5100
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 74, No. 8 ( 1993-10-15), p. 5096-5100
    Abstract: We have prepared a bulk Y0.8Ho0.2Ba2Cu3Oy superconductor by the powder melting process method and investigated its magnetization curves and magnetic relaxation in the temperature range 55–77 K at different fields. The Jc values at a certain temperature and field is estimated by Bean’s model. It is found that Jc decreases with the magnetic field according to a power law, whereas it drops exponentially with temperature. The dependence on temperature of the maximum diamagnetization field Hp and the remanent magnetization Mrem is discussed. The magnetic relaxation indicates that the magnetization M varies logarithmically with time. The relaxation rate dM/d ln t is also studied.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.354295
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1993
    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 highly sensitive photoacoustic spectrometer for near infrared overtone
    AIP Publishing ; 2000
    In:  Review of Scientific Instruments Vol. 71, No. 5 ( 2000-05-01), p. 1975-1980
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 71, No. 5 ( 2000-05-01), p. 1975-1980
    Abstract: By optimizing the size of a photoacoustic cell for decreasing acoustic loss and noise, and using a proper multipass arrangement for increasing light power in the cell and optical coupling to the acoustic wave, a high-resolution external laser photoacoustic spectrometer with a detection sensitivity of 6.35×10−9 cm−1 (1:1 signal to noise level) has been developed. Using this apparatus, the high quality Doppler-limited overtone spectra of AsH3 (600) and H2Se (60) have been observed at room temperature in the wave number regions 11 500–11 650 and 12 600–12 925 cm−1, respectively. Results are presented which highlight the applicability of this apparatus to the spectroscopy of weak optical transitions.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/1.1150564
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2000
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
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  • 4
    Online Resource
    Online Resource
    A parametric investigation on the cyclotron maser instability driven by ring-beam electrons with intrinsic Alfvén waves
    AIP Publishing ; 2017
    In:  Physics of Plasmas Vol. 24, No. 5 ( 2017-05-01)
    Details
    In: Physics of Plasmas, AIP Publishing, Vol. 24, No. 5 ( 2017-05-01)
    Abstract: The electron-cyclotron maser is a process that generates the intense and coherent radio emission in the plasma. In this paper, we present a comprehensive parametric investigation on the electron-cyclotron-maser instability driven by non-thermal ring-beam electrons with intrinsic Alfvén waves, which pervade the solar atmosphere and interplanetary space. It is found that both forward propagating and backward propagating waves can be excited in the fast ordinary (O) and extraordinary (X) electromagnetic modes. The growth rates of X1 mode are almost always weakened by Alfvén waves. The average pitch-angle ϕ0 of electrons is a key parameter for the effect of Alfvén waves on the growth rate of modes O1, O2, and X2. For a beam-dominated electron distribution (ϕ0≲30°), the growth rates of the maser instability for O1, O2, and X2 modes are enhanced with the increase of the Alfvén wave energy density. In other conditions, the growth rates of O1, O2, and X2 modes weakened with the increasing Alfvén wave intensity, except that the growth of the O1 mode may also be enhanced by Alfvén waves for a ring distribution. The results may be important for us in analyzing the mechanism of radio bursts with various fine structures observed in space and astrophysical plasmas.
    Type of Medium: Online Resource
    ISSN: 1070-664X , 1089-7674
    URL: Article
    DOI: 10.1063/1.4982213
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2017
    detail.hit.zdb_id: 1472746-8
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  • 5
    Online Resource
    Online Resource
    Strong interface-induced spin-charge conversion in YIG/Cr heterostructures
    AIP Publishing ; 2020
    In:  Applied Physics Letters Vol. 117, No. 11 ( 2020-09-14)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 117, No. 11 ( 2020-09-14)
    Abstract: Here, we have investigated the spin pumping effect of Y3Fe5O12 (YIG)/Cu (tCu nm)/Cr heterostructures at room temperature with the thickness of the Cu interlayer varying from 0.4 nm to 5.0 nm. A huge charge signal Ic = 0.239 μA is observed in a YIG/Cr bilayer with direct contact, whereas Ic drops dramatically by two orders of magnitude when thin Cu interlayers down to 0.4 nm are inserted between YIG and Cr. Meanwhile, the injected spin current Js stays almost invariant for all the heterostructures. The effective spin Hall angle “θSH” of the YIG/Cr interface is found to be three orders of magnitude larger than the spin Hall angle θSH of the bulk Cr layer in YIG/Cu/Cr. The huge spin-charge conversion efficiency at the YIG/Cr interface is attributed to the inverse Rashba–Edelstein effect. Our experimental results demonstrate the dominant role of the interfacial effect in the spin-charge conversion process of the YIG/Cr heterostructures.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0017745
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 6
    Online Resource
    Online Resource
    Discharge characteristics of a microsecond pulse power supply driven air plasma jet and its anticancer cell effect
    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: In plasma cancer therapy, atmospheric pressure plasma jets have attracted increasing attention in recent years. In this study, from the point of view of economic costs and portability, we have employed atmospheric air as the working gas in order to investigate the effects of the rate of flow, applied voltage, frequency, and pulse width on the characteristics of discharge. The concentrations of reactive oxygen and nitrogen species (RONS) in a plasma-activated medium (PAM) were characterized in order to explore their chemical activity. In addition, the inactivating effect of tumor cells induced by an air plasma jet was investigated and the corresponding inactivation mechanism is also discussed. The results showed that the discharge intensity was positively correlated with frequency and voltage, and negatively correlated with pulse width. Regarding the gas flow rate, when the air flow rate was 1 standard liter per minute (SLM), the discharge intensity was strongest according to the length of the plume. By summarizing the discharge characteristics and emission spectra under different experimental parameters, the stable treatment conditions producing rich active substances were as follows: a frequency of 6 kHz, a voltage of 14 kV, a gas flow rate of 1 SLM, and a pulse width of 1 μs. Furthermore, under these stabilized conditions, the air plasma jet produced rich aqueous RONS in a PAM effectively, which killed cells in significant numbers and reduced the cell survival rate. Therefore, this study demonstrates the potential application of an atmospheric PAM for the treatment of tumor cells and promotes a deeper understanding of plasma liquid chemistry.
    Type of Medium: Online Resource
    ISSN: 1070-664X , 1089-7674
    URL: Article
    DOI: 10.1063/5.0069851
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 1472746-8
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  • 7
    Online Resource
    Online Resource
    Two local vibrational modes related to hydrogen in GaN
    AIP Publishing ; 1997
    In:  Journal of Applied Physics Vol. 82, No. 11 ( 1997-12-01), p. 5745-5747
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 82, No. 11 ( 1997-12-01), p. 5745-5747
    Abstract: We have observed two absorption bands located at around 1730 and 2960 cm−1 in the infrared (IR) absorption spectra from undoped GaN samples which are grown using low pressure metalorganic vapor phase epitaxy and irradiated by gamma ray and then exposed to a radio frequency hydrogen plasma. Proton implantation followed by gamma-ray irradiation of the GaN samples can also activate the IR band at around 1730 cm−1. Based on the experimental results, we tentatively ascribe the 1730 cm−1 band to the local vibrational modes of Ga–H complexes in the vicinity of N vacancies and the 2960 cm−1 band to those of either N–H complexes in the vicinity of Ga vacancies or C–H complexes.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.366438
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1997
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 8
    Online Resource
    Online Resource
    High energy and high brightness laser compton backscattering gamma-ray source at IHEP
    AIP Publishing ; 2018
    In:  Matter and Radiation at Extremes Vol. 3, No. 4 ( 2018-07-01), p. 219-226
    Details
    In: Matter and Radiation at Extremes, AIP Publishing, Vol. 3, No. 4 ( 2018-07-01), p. 219-226
    Abstract: Based on the LINAC of BEPCII, a high-polarized, high bightness, energy-tunable, monoenergetic laser compton backscattering (LCS) gamma-ray source is under construction at IHEP. The gamma-ray energy range is from 1 MeV to 111 MeV. It is a powerful and hopeful research platform to reveal the underlying physics of the nuclear, the basic particles and the vacuum or to check the exist basic physical models, quantum electrodynamic (QED) theories. In the platform, a 1.064 μm Nd:YAG laser system and a 10.6 μm CO2 laser system are employed. All the trigger signals to the laser system and the electron control system are from the only reference clock at the very beginning of the LINAC to make sure the temporal synchronization. Two optical transition radiation (OTR) targets and two charged-couple devices (CCD) are used to monitor and to align the electron beam and the laser beam. With the LCS gamma-ray source, it is proposed to experimentally check the gamma-ray calibrations, the photon-nuclear physics, nuclear astrophysics and some basic QED phenomena.
    Type of Medium: Online Resource
    ISSN: 2468-2047 , 2468-080X
    URL: Article
    DOI: 10.1016/j.mre.2018.01.005
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2018
    detail.hit.zdb_id: 2858469-7
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  • 9
    Online Resource
    Online Resource
    A point of care platform based on microfluidic chip for nucleic acid extraction in less than 1 minute
    AIP Publishing ; 2019
    In:  Biomicrofluidics Vol. 13, No. 3 ( 2019-05-01)
    Details
    In: Biomicrofluidics, AIP Publishing, Vol. 13, No. 3 ( 2019-05-01)
    Abstract: In view of the complex procedure of nucleic acid extraction, there exists a huge challenge for the widespread use of point-of-care diagnostics for nucleic acid testing. To achieve point-of-care applications in a more rapid and cost-efficient manner, we designed a snake pipe-shaped microfluidic chip so as to accomplish reagents-prestored, time-saving, operation-simple nucleic acid extraction. All reagents needed for this process, including lysis buffer, wash buffer, elution buffer, and so on, were preloaded in the snake pipe and securely isolated by membrane valves, without the need for using any specialized equipment. By an integrated chip and a powerful ultrasonic, this device could complete virus nucleic acid extraction from sophisticated serum samples in less than 1 min. We used hepatitis B virus (HBV) and human immunodeficiency virus (HIV) mixed with different sources of serum as samples to be extracted. The coefficient of variation of HBV and HIV extraction on-chip was 1.32% and 2.74%, respectively, and there were no significant differences between on-chip and commercial instrument extraction (P  & gt; 0.05, α = 0.05) in different dilution ratios, which showed that the extraction device we established had excellent stability and sensitivity.
    Type of Medium: Online Resource
    ISSN: 1932-1058
    URL: Article
    DOI: 10.1063/1.5088552
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 2265444-6
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  • 10
    Online Resource
    Online Resource
    Two-terminal terahertz detectors based on AlGaN/GaN high-electron-mobility transistors
    AIP Publishing ; 2019
    In:  Applied Physics Letters Vol. 115, No. 11 ( 2019-09-09)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 115, No. 11 ( 2019-09-09)
    Abstract: We report an approach to make two-terminal antenna-coupled AlGaN/GaN high-electron-mobility-transistor self-mixing terahertz detectors. Fluorine ion implantation is used to increase the threshold voltage of the AlGaN/GaN two-dimensional electron gas. An optimal implantation dose can be reached so that the detector responsivity is maximized at zero gate voltage or with the gate floating. The relationship between the ion dosage and the threshold voltage, electron mobility, electron density, responsivity, and noise-equivalent power (NEP) is obtained. A minimum optical NEP of 47  pW/Hz is achieved from a two-terminal detector at 0.65 THz. The capability of two-terminal operation allows for the design of a large array of antenna-coupled high-electron-mobility transistor detectors without the demanding needs of routing negative gate voltage lines around the antenna array and minimizing the gate leakage current.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.5114682
    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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