核心期刊
关键词: Strange quark star; Gravitational wave echoes; Color-favour-locked phase; Strange quark matter;
DOI：10.1007/s41365-023-01336-7
提交时间： 2024-01-09
摘要：According to the recent studies, the gravitational wave (GW) echoes are expected to be generated by quark stars composed of ultrastif quark matter. The ultrastif equations of state (EOS) for quark matter were usually obtained either by a simple bag model with artifcially assigned sound velocity or by employing interacting strange quark matter (SQM) depicted by simple reparameterization and rescaling. In this study, we investigate GW echoes with EOSs for SQM in the framework of the equivparticle model with density-dependent quark masses and pairing efects. We conclude that strange quark stars (SQSs) can be sufciently compact to possess a photon sphere capable of generating GW echoes with frequencies in the range of approximately 20 kHz. However, SQSs cannot account for the observed 72 Hz signal in GW170817 event. Furthermore, we determined that quark-pairing efects play a crucial role in enabling SQSs to satisfy the necessary conditions for producing these types of echoes.
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498
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100
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0
关键词: BESIII tracking detector; CMOS pixel sensor; Track reconstruction; Common tracking software;
DOI：10.1007/s41365-023-01353-6
提交时间： 2023-12-13
摘要：The reconstruction of the tracks of charged particles with high precision is crucial for HEP experiments to
achieve their physics goals. The BESIII drift chamber, which is used as the tracking detector of the BESIII
experiment, has suffered from aging effects resulting in degraded tracking performance after operation for ap-
proximately 15 years. To preserve and enhance the tracking performance of BESIII, one of the proposals is to
add one layer of a thin cylindrical CMOS pixel sensor based on state-of-the-art stitching technology between
the beam pipe and the drift chamber. The improvement in the tracking performance of BESIII with such an
additional pixel detector compared to that with only the existing drift chamber was studied using the modern
common tracking software ACTS , which provides a set of detector-agnostic and highly performant tracking
algorithms that h
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516
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129
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0
关键词: Molecular dynamics method; Displacement cascade; Ni-Mo alloy;
DOI：dx.doi.org/10.13538/j.1001-8042/nst.26.060603
提交时间： 2023-06-18
摘要：Molecular dynamics method is used to investigate the displacement cascades in Ni-Mo binary alloy. Effects of the irradiation temperature, energy of the primary knock-on atoms and concentration of solute Mo atoms are taken into consideration on radiation damage to the Ni-Mo alloy. It is found that Mo atoms reduce production of the Frenkel pairs at 100 K, while they enhance defect production at 300 K and 600 K. Size of the largest defect clusters decreases with increasing concentrations of Mo atoms (CMo) at 100 K, but it increases with CMo at 300 K and 600 K. Most of the point defects get clustered in cascades leaving only a few vacancies and interstitials isolated.
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2085
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320
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0
关键词: FLiNaK; Cr; Corrosion product; K2NaCrF6;
DOI：dx.doi.org/10.13538/j.1001-8042/nst.26.060602
提交时间： 2023-06-18
摘要：To investigate the corrosion products of Cr in molten FLiNaK salt (46.5 mol% LiF–11.5 mol% NaF–42 mol% KF), the corrosion test of the pure metal Cr was performed in molten FLiNaK salt at 700 ℃ for 200 h. The FLiNaK salt after the corrosion test was thoroughly investigated by X-ray absorption near-edge structure spectroscopy, a transmission electron microscope, and X-ray diffraction. The results demonstrate that the predominant oxidation state of Cr in FLiNaK salt is Cr3+, and the main corrosion product in cooled FLiNaK salt is K2NaCrF6.
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2063
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316
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0
关键词: Steam generator tube rupture; Molten LBE; Fragmentation; Steam explosion; Interfacial instability;
DOI：dx.doi.org/10.13538/j.1001-8042/nst.26.060601
提交时间： 2023-06-18
摘要：Based on the design of CLEAR (China LEAd-based Reactor), it is important to study the molten LBE (Lead-Bismuth Eutectic)/water interaction following an incidental steam generator tube rupture (SGTR) accident. Experiments were carried out to investigate the fragmentation behavior of the molten LBE/water contacting interface, with a high-speed video camera to record the fragmentation behavior of 300–600 ℃ LBE at 20 ℃ and 80 ℃ of water temperature. Violent explosion phenomenon occurred at water temperature of 20 ℃, while no explosion occurred at 80 ℃. Shapes of the LBE debris became round at 80 ℃ of water temperature, whereas the debris was of the needle-like shape at 20 ℃. For all the molten LBE and water temperatures in the present study, the debris sized at 2.8–5.0 mm had the largest mass fraction. The results indicate that the dominant physical mechanism of the molten LBE fragmentation was the Kelvin-Helmholtz instability between LBE/water direct contact interface.
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2237
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336
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0
关键词: Electrochemical sensor; Microelectrode; Dopamine detection; Ascorbic acid;
DOI：dx.doi.org/10.13538/j.1001-8042/nst.26.060504
提交时间： 2023-06-18
摘要：In this paper, a novel method for selectively detection of dopamine (DA) in the interference of ascorbic acid (AA) is described. A nanometer-sized gold flower microelectrode (NGFME) is prepared by flame-etching and electrochemical deposition. The electrode tip was characterized by scanning electron microscope (SEM). The NGFME is sized at about 100 μm and dimensions of thorns of the electrode were in nanometers. By modifying with DA aptamer on the surface, the prepared aptasensor can selectively detect DA even in the presence of high concentration AA. Experimental results show that this NGFME has no response to AA. As a comparison, the carbon fiber electrode without DA aptamer modification is unable to effectively detect DA in the presence of AA. The NGFME is easy-to-prepare, selective and sensitive for DA detection down to 25 μm. The electrode can be expected to detect DA in vivo and in real biological samples.
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1183
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236
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0
关键词: Heat shock protein 90; N-terminal domain; Inhibitor; X-ray diffraction; Interactions;
DOI：dx.doi.org/10.13538/j.1001-8042/nst.26.060503
提交时间： 2023-06-18
摘要：The N-terminal domain of heat shock protein 90 (Hsp90N) is responsible for the catalytic activity of Hsp90. The reported inhibitors of Hsp90 bind to this domain and would inhibit tumor growth and progression. Here, we synthesized FS23, a small molecule inhibitor of hsp90 and collected X-ray diffraction data of the complex crystal of Hsp90-FS23. High resolution X-ray crystallography shows that FS23 interacted with Hsp90N at the nucleotide binding cleft, and this suggests that FS23 may complete with nucleotides to bind to Hsp90N. The crystal structure and the interaction between Hsp90N and FS23 suggest a rational basis for the design of novel antitumor drugs.
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1496
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226
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0
关键词: Bovine serum albumin; Rhodamine B; Binding sites; Scatchard equation; Size exclusion chromatography;
DOI：dx.doi.org/10.13538/j.1001-8042/nst.26.060502
提交时间： 2023-06-18
摘要：Strategies for labeling proteins with fluorophores are always important for biotechnology. Here we take a model protein (bovine serum albumin) and a typical fluorophore (rhodamine B) to demonstrate a direct labeling method just by physical adsorption. In combination with size exclusion chromatography and the Scartchard equation, we have developed a facile analysis method for calculating the binding constant and binding sites. The molecular docking method has been used to study the binding site in amino acid level.
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1252
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231
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0
关键词: 232Th(n; 2n)231Th reaction; Cross-section; Neutron activation method;
DOI：dx.doi.org/10.13538/j.1001-8042/nst.26.060501
提交时间： 2023-06-18
摘要：In this study, the activation cross-sections were measured for 232Th(n,2n)231Th reactions at neutron energies of 14.1 and 14.8 MeV, which were produced by a neutron generator through a T(d,n)4He reaction. Induced gamma-ray activities were measured using a low background gamma ray spectrometer equipped with a high resolution HPGe detector. In the cross-section calculations, corrections were made regarding the effects of gamma-ray attenuation, dead-time, fluctuation of the neutron flux, and low energy neutrons. The measured cross-sections were compared with the literature data, evaluation data (ENDF-B/VII.1, JENDL-4.0 and CENDL-3.1), and the results of the model calculation (TALYS1.6).
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241
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关键词: 252Cf-source-driven neutron signal; Empirical mode decomposition; Compressive sensing; Denoising;
DOI：dx.doi.org/10.13538/j.1001-8042/nst.26.060404
提交时间： 2023-06-18
摘要：As photoelectrically detected 252Cf-source-driven neutron signals always contain noise, a denoising algorithm is proposed based on compressive sensing for the noised neutron signal. In the algorithm, Empirical Mode Decomposition (EMD) is applied to decompose the noised neutron signal and then find out the noised Intrinsic Mode Function (IMF) automatically. Thus, we only need to use the basis pursuit denoising (BPDN) algorithm to denoise these IMFs. For this reason, the proposed algorithm can be called EMDCSDN (Empirical Mode Decomposition Compressive Sensing Denoising). In addition, five indicators are employed to evaluate the denoising effect. The results show that the EMDCSDN algorithm is more effective than the other denoising algorithms including BPDN. This study provides a new approach for signal denoising at the front-end.
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1497
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262
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0
