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  • AIP Publishing  (10)
  • 1
    Online Resource
    Online Resource
    Ion temperature measurements of indirect-drive implosions with the neutron time-of-flight detector on SG-III laser facility
    AIP Publishing ; 2018
    In:  Review of Scientific Instruments Vol. 89, No. 2 ( 2018-02-01)
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 89, No. 2 ( 2018-02-01)
    Abstract: The accuracy of the determination of the burn-averaged ion temperature of inertial confinement fusion implosions depends on the unfold process, including deconvolution and convolution methods, and the function, i.e., the detector response, used to fit the signals measured by neutron time-of-flight (nToF) detectors. The function given by Murphy et al. [Rev. Sci. Instrum. 68(1), 610–613 (1997)] has been widely used in Nova, Omega, and NIF. There are two components, i.e., fast and slow, and the contribution of scattered neutrons has not been dedicatedly considered. In this work, a new function, based on Murphy’s function has been employed to unfold nToF signals. The contribution of scattered neutrons is easily included by the convolution of a Gaussian response function and an exponential decay. The ion temperature is measured by nToF with the new function. Good agreement with the ion temperature determined by the deconvolution method has been achieved.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/1.5022767
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2018
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
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  • 2
    Online Resource
    Online Resource
    Note: Neutron bang time diagnostic system on Shenguang-III prototype
    AIP Publishing ; 2014
    In:  Review of Scientific Instruments Vol. 85, No. 4 ( 2014-04-01)
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 85, No. 4 ( 2014-04-01)
    Abstract: A neutron bang time (NBT) diagnostic system has been implemented on Shenguang-III prototype. The bang time diagnostic system is based on a sensitive fusion neutron detector, which consists of a plastic scintillator and a micro-channel plate photomultiplier tube (PMT). An optical fiber bundle is used to couple the scintillator and the PMT. The bang time system is able to measure bang time above a neutron yield of 107. Bang times and start time of laser were related by probing x-ray pulses produced by 200 ps laser irradiating golden targets. Timing accuracy of the NBT is better than 60 ps.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/1.4870902
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2014
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
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  • 3
    Online Resource
    Online Resource
    A neutron time-of-flight system for inertial confinement fusion
    AIP Publishing ; 2020
    In:  Review of Scientific Instruments Vol. 91, No. 2 ( 2020-02-01)
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 91, No. 2 ( 2020-02-01)
    Abstract: A neutron time-of-flight (nTOF) system has been implemented at the largest laser facility in China. The nTOF system is used to measure neutron spectra in inertial confinement fusion experiments. The nTOF system consists of 11 fast plastic scintillation detectors. The detectors employed three designs to measure neutron yield, ion temperature, and neutron bang time. The nTOF system is capable of measuring the primary neutron yield from 107 to 1013, secondary DT neutron yield from 106 to 108, and ion temperature and neutron bang time yields from 108 to 1013. The accuracies of the nTOF system are about 10% for neutron yield and ion temperature measurements and better than 60 ps for neutron bang time measurements. The nTOF system has become one of the most important diagnostics for implosions, and it is used for more than 200 shots per year.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/1.5109711
    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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  • 4
    Online Resource
    Online Resource
    Monolithic GaN optoelectronic system on a Si substrate
    AIP Publishing ; 2022
    In:  Applied Physics Letters Vol. 121, No. 18 ( 2022-10-31)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 121, No. 18 ( 2022-10-31)
    Abstract: GaN-based devices have grown rapidly in recent decades, due to their important research value and application prospects. There is a desire to monolithically integrate different GaN devices into a single chip for the development of future optoelectronic systems with low power consumption. In addition to improved multifunctional performance, a miniature integrated system can result in a significant reduction in material costs, processing costs, and packaging costs. In view of such prospects, we propose monolithic, top-down approaches to build III-nitride transmitter, modulator, waveguide, beam splitter, receiver, and monitor as a single unit onto a conventional GaN-on-silicon wafer without involving regrowth or postgrowth doping. Data communication among these components is realized through light propagation, opening up horizons for GaN optoelectronic systems on a chip.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0125324
    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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  • 5
    Online Resource
    Online Resource
    Spin susceptibility, upper critical field, and disorder effect in j=32 superconductors with singlet–quintet mixing
    AIP Publishing ; 2020
    In:  Journal of Applied Physics Vol. 128, No. 6 ( 2020-08-14)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 128, No. 6 ( 2020-08-14)
    Abstract: Recently, a new pairing state with the mixing between the s-wave singlet channel and the isotropic d-wave quintet channel induced by centrosymmetric spin–orbit coupling has been theoretically proposed in the superconducting materials with j=32 electrons [J. Yu and C.-X. Liu, Phys. Rev. B 98, 104514 (2018)]. In this work, we derive the expressions of the zero-temperature spin susceptibility, the upper critical field close to the zero-field critical temperature Tc, and the critical temperature with weak random non-magnetic disorders for the singlet–quintet mixed state based on the Luttinger model. Our study reveals the following features of the singlet–quintet mixing. (1) The zero-temperature spin susceptibility remains zero for the singlet–quintet mixed state if only the centrosymmetric spin–orbit coupling is taken into account and deviates from zero when the non-centrosymmetric spin–orbit coupling is introduced. (2) The singlet–quintet mixing can help enhance the upper critical field roughly because it can increase Tc. (3) Although the quintet channel is generally suppressed by the non-magnetic disorder scattering, we find the strong mixing between singlet and quintet channels can help to stabilize the quintet channel. As a result, we still find a sizable quintet component mixed into the singlet channel in the presence of weak random non-magnetic disorders. Our work provides the guidance for future experiments on spin susceptibility and upper critical field of the singlet–quintet mixed superconducting states and illustrates the stability of the singlet–quintet mixing against the weak random non-magnetic disorder.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/5.0013596
    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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  • 6
    Online Resource
    Online Resource
    A hybrid Genetic Algorithm and Levenberg–Marquardt (GA–LM) method for cell suspension measurement with electrical impedance spectroscopy
    AIP Publishing ; 2020
    In:  Review of Scientific Instruments Vol. 91, No. 12 ( 2020-12-01)
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 91, No. 12 ( 2020-12-01)
    Abstract: A hybrid Genetic Algorithm (GA) and Levenberg–Marquardt (GA–LM) method is proposed for cell suspension measurement with electrical impedance spectroscopy. This algorithm combines the GA with global search ability and Levenberg–Marquardt (LM) algorithm with local search ability, which has the advantages of high accuracy and high robustness. First, GA–LM is compared with GA and LM algorithm separately by ideal simulation. Second, Gaussian noise is added to the ideal simulation data. The anti-noise ability of the GA–LM is discussed. Finally, experiments are conducted to verify the practicability of the proposed GA–LM method. In the experiment, GA–LM is used to fit the impedance spectrum of yeast suspensions with different volume fractions and active states. The results show that the GA–LM algorithm can converge to the real value that is set in the simulation under ideal numerical simulation conditions. In the simulation within 2% noise level, the mean relative error of the parameter solution is less than 4%, and the root mean square error of the fitting is less than 0.4. This method also performs well in fitting of the experimental data. In addition, the electric double layer resistance and cell membrane capacitance are selected as the main indicators for the identification of yeast suspension concentration and activity, respectively.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/5.0029491
    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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  • 7
    Online Resource
    Online Resource
    On wave–current interaction with a horizontal cylinder: Load characteristics and vortex pattern
    AIP Publishing ; 2023
    In:  Physics of Fluids Vol. 35, No. 1 ( 2023-01-01)
    Details
    In: Physics of Fluids, AIP Publishing, Vol. 35, No. 1 ( 2023-01-01)
    Abstract: This study performed a two-dimensional experiment to reveal the load characteristics of a submerged horizontal cylinder with vortex patterns in the wake region under wave–current flows. Wave–current conditions were tested with both following and opposing currents. Instantaneous representations of the velocity field, streamline topology, and vorticity patterns, obtained using particle image velocimetry, provided insight into the origin of the unsteady loading of the cylinder. The spatiotemporal characteristics of the pressure distribution on the cylinder were analyzed using Fourier series expansion across the circumference of the cylinder. The results demonstrate that, unlike the action of current only, the presence of waves modifies the frequency and position of vortex shedding, resulting in three distinct modes in the frequency domain of the vertical force on the cylinder, where each mode exhibits a distinct mode of vortex shedding. The variation in frequency domain of Fourier coefficients of pressure around the cylinder is consistent with the force corresponding to different modes. Moreover, velocity rate β and the frequency relationship between the wave and current-induced vortex shedding play important roles in the frequency characteristics of the vertical force.
    Type of Medium: Online Resource
    ISSN: 1070-6631 , 1089-7666
    URL: Article
    DOI: 10.1063/5.0129972
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 1472743-2
    detail.hit.zdb_id: 241528-8
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  • 8
    Online Resource
    Online Resource
    Characteristics of wave pressure on an inclined plate
    AIP Publishing ; 2023
    In:  Physics of Fluids Vol. 35, No. 10 ( 2023-10-01)
    Details
    In: Physics of Fluids, AIP Publishing, Vol. 35, No. 10 ( 2023-10-01)
    Abstract: In this study, the hydrodynamic pressure of regular waves acting on an inclined plate was experimentally investigated. Particle image velocimetry was used to acquire the velocity field in front of the inclined plate. Comparison of the results obtained by the linear wave theory revealed the effects of various factors, including the plate angle, wave steepness, and wave period, on the pressure profile. The pressure gradient along the plate above the still water level was analyzed to demonstrate the feasibility of the straight-line pressure distribution. Dynamic mode decomposition was used to explain the modal composition of the wave pressure evolution within a period. For large wave steepness, the second-order mode dominated at the bottom, resulting in a negative pressure at the wave crest. This phenomenon was reflected as two consecutive peaks in the pressure-time history, which are referred to as double humps. When the plate was inclined in the same direction as the incident wave, the wave became steeper, and the value of the dynamic pressure gradient increased near the still water level. However, this effect was not observed when the inclination of the plate was opposite to that of the incident wave.
    Type of Medium: Online Resource
    ISSN: 1070-6631 , 1089-7666
    URL: Article
    DOI: 10.1063/5.0168985
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 1472743-2
    detail.hit.zdb_id: 241528-8
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  • 9
    Online Resource
    Online Resource
    Research of areal density diagnostic technique on Shenguang III laser prototype facility
    AIP Publishing ; 2008
    In:  Review of Scientific Instruments Vol. 79, No. 8 ( 2008-08-01)
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 79, No. 8 ( 2008-08-01)
    Abstract: In the test run of Shenguang III laser prototype facility, under the low density condition, the yield ratio method was used to measure the fuel areal density. Considering the uncertainty of the neutron yield, detectors with different efficiencies were used. The clear secondary-neutron signals in inertial confinement fusion experiments were obtained for the first time in China, and the values of the areal density were deduced.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/1.2970943
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2008
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
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  • 10
    Online Resource
    Online Resource
    DeePMD-kit v2: A software package for deep potential models
    AIP Publishing ; 2023
    In:  The Journal of Chemical Physics Vol. 159, No. 5 ( 2023-08-07)
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 159, No. 5 ( 2023-08-07)
    Abstract: DeePMD-kit is a powerful open-source software package that facilitates molecular dynamics simulations using machine learning potentials known as Deep Potential (DP) models. This package, which was released in 2017, has been widely used in the fields of physics, chemistry, biology, and material science for studying atomistic systems. The current version of DeePMD-kit offers numerous advanced features, such as DeepPot-SE, attention-based and hybrid descriptors, the ability to fit tensile properties, type embedding, model deviation, DP-range correction, DP long range, graphics processing unit support for customized operators, model compression, non-von Neumann molecular dynamics, and improved usability, including documentation, compiled binary packages, graphical user interfaces, and application programming interfaces. This article presents an overview of the current major version of the DeePMD-kit package, highlighting its features and technical details. Additionally, this article presents a comprehensive procedure for conducting molecular dynamics as a representative application, benchmarks the accuracy and efficiency of different models, and discusses ongoing developments.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/5.0155600
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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