[en] The proton and neutron properties in a uniform magnetic field are investigated. The Gell–Mann–Nishijima formula is shown to be satisfied for baryon states. It is found that with increasing magnetic field strength, the proton mass first decreases and then increases, while the neutron mass always increases. The ratio between magnetic moment of proton and neutron increases with the increase of the magnetic field strength. With increasing magnetic field strength, the size of proton first increases and then decreases, while the size of neutron always decreases. The present analysis implies that in the core part of the magnetar, the equation of state depend on the magnetic field, which modifies the mass limit of the magnetar.

[en] Image reconstruction is one of the pivotal technologies in topographic gamma scanning (TGS). Interative method is one of the image reconstruction technologies. The paper introuduces several iterative methods, and calculates the transmission model in literature [7] with these methods. (authors)

[en] The effects of mixing between the light scalar mesons on the skyrmion properties are studied. In the present study, the mixing states of the two-quark and four-quark fields are identified as the physical scalar mesons. It is found that the more lighter scalar meson comes from two-quark component state, the lighter soliton mass becomes and the larger soliton size becomes. (author)

[en] The Wilson and the improved cooling methods are used to explore the topological properties of SU(2) gauge field on lattice. Topological charge values which are close to integers are obtained. The measured charges through the Wilson cooling are within about 15% discrepancy to integers, and most of the configurations tend rapidly to 0-charged flat vacuum, while the charges through improved cooling are refined to almost integers within a few percentage of error and the corresponding plateaus last longer. The final charges and the evolutions of the same configuration cooled from various improved actions are different from each other due to the lattice artifact

[en] The full-heavy tetraquarks $cc\stackrel{¯<!--\; ??\; -->}{c}\stackrel{¯<!--\; ??\; -->}{b}$ and $bb\stackrel{¯<!--\; ??\; -->}{b}\stackrel{¯<!--\; ??\; -->}{c}$ are systematically investigated within a quark model. The meson-meson structure, diquark-antidiquark structure and K-structure are considered in this work. There is no bound state for $cc\stackrel{¯<!--\; ??\; -->}{c}\stackrel{¯<!--\; ??\; -->}{b}$ and $bb\stackrel{¯<!--\; ??\; -->}{b}\stackrel{¯<!--\; ??\; -->}{c}$ systems in I J${}^P$ = 00${}^{+}$, 01${}^{+}$ and 02${}^{+}$ channels. However, for $cc\stackrel{¯<!--\; ??\; -->}{c}\stackrel{¯<!--\; ??\; -->}{b}$ system, three possible resonance states with energy of 10,079 MeV, 10,081 MeV and 10,177 MeV are found in I J${}^P$ = 00${}^{+}$, 01${}^{+}$ and 02${}^{+}$, respectively, and their decay width Γ are 6.7-8.4 MeV, 1.4-7.2 MeV and 9.1-11.1 MeV. For $bb\stackrel{¯<!--\; ??\; -->}{b}\stackrel{¯<!--\; ??\; -->}{c}$ system, there also exist three possible resonance states with energy of 16,474 MeV, 16,474 MeV and 16,541 MeV in I J${}^P$ = 00${}^{+}$, 01${}^{+}$ and 02${}^{+}$, respectively, and the decay widths Γ of them are 2.2-6.1 MeV, 2.2-6.9 MeV and 5.3-8.5 MeV. $bc\stackrel{¯<!--\; ??\; -->}{c}\stackrel{¯<!--\; ??\; -->}{c}$ and $cb\stackrel{¯<!--\; ??\; -->}{b}\stackrel{¯<!--\; ??\; -->}{b}$ systems will have the same results as $cc\stackrel{¯<!--\; ??\; -->}{c}\stackrel{¯<!--\; ??\; -->}{b}$ and $bb\stackrel{¯<!--\; ??\; -->}{b}\stackrel{¯<!--\; ??\; -->}{c}$, respectively. These full-heavy resonance states are worthy to be searched in the future experiments.

[en] Semiconductor photocatalyst as a new type of green and sustainable energy material has extensively used in wastewater and gas treatment. In this work, we prepared Pt/h-BN/BiOBr composite by an alcohol-soluble hydrolysis-assisted photoreduction method. The photocatalytic activity was evaluated by the degradation of bisphenol A under simulated sunlight, and the degradation efficiency of BiOBr, h-BN/BiOBr, Pt/BiOBr, and Pt/h-BN/BiOBr were 55.13%, 74.91%, 89.00%, and 98.54%, respectively. The results showed single composited with h-BN or Pt could improve the photocatalytic performance of BiOBr, while double composited with h-BN and Pt could play a synergistic effect on further improving the activity. The interaction between h-BN and BiOBr was electrostatic interactions, and that Pt as a plasma metal was coupling with BiOBr due to its localized surface plasmon resonance (LSPR) effect. The composition, morphology, optical property, and separation efficiency of photo-induced carriers and dominant active radicals were investigated. Based on the results, a possible mechanism was proposed. The excellent photocatalytic activity of Pt/h-BN/BiOBr composite photocatalyst could be attributed to the broadened light-response range after Pt loading, and enhanced electron–hole separation efficiency due to the electron capturer role of Pt and the hole transfer function of h-BN.

[en] A bi-functionalized hybrid silica (TP-silica) sorbent has been prepared through post-grafting of both positively charged and uranium chelate groups for efficient uranium(VI) uptake in a NH_3/N environment. The introduction of the above two groups was achieved by ammonium and phosphonate moieties covalently anchored on the silica surface. The prepared sorbent was characterized using scanning electron microscopy, elemental analysis, and "1"3C-nuclear magnetic resonance. Detailed U(VI) sorption behaviors on the sorbent were also discussed. The combination of these two kinds of functionalized groups on the sorbent has shown to be an effective method for the U(VI) uptake in NH_3/N environments. (author)

[en] With the discovery of some hidden-charm pentaquark resonances by the LHCb Collaboration, investigations of pentaquark states containing heavy quarks have aroused the interest of theorists. We study herein $qqq\stackrel{¯<!--\; ??\; -->}{q}Q$ (q = u or d, Q=c or b) pentaquark system, in the framework of the chiral quark model. In consequence, some charmed and bottomed pentaquarks are considered to exist by five-body dynamical calculations. In the charm sector, ${\mathrm{\Sigma <!--\; ??\; -->}}_c\mathrm{\pi <!--\; ??\; -->}(I{J}^P=0{\frac{1}{2}}^{-<!--\; ???\; -->})$ and ${\mathrm{\Sigma <!--\; ??\; -->}}_c^{\ast <!--\; ???\; -->}\mathrm{\pi <!--\; ??\; -->}(I{J}^P=0{\frac{3}{2}}^{-<!--\; ???\; -->})$ are possible candidates of ${\mathrm{\Lambda <!--\; ??\; -->}}_c$(2595) and ${\mathrm{\Lambda <!--\; ??\; -->}}_c$(2625), respectively. Besides, two high-spin states, ${\mathrm{\Sigma <!--\; ??\; -->}}_c^{\ast <!--\; ???\; -->}\mathrm{\rho <!--\; ??\; -->}(I{J}^P=0{\frac{5}{2}}^{-<!--\; ???\; -->})$ and $\mathrm{\Delta <!--\; ??\; -->}{D}^{\ast <!--\; ???\; -->}(I{J}^P=1{\frac{5}{2}}^{-<!--\; ???\; -->})$, are also found in the energy region of 3.2 ∼ 3.3 GeV. In the bottom sector, ${\mathrm{\Sigma <!--\; ??\; -->}}_b\mathrm{\pi <!--\; ??\; -->}(I{J}^P=0{\frac{1}{2}}^{-<!--\; ???\; -->})$, ${\mathrm{\Sigma <!--\; ??\; -->}}_b^{\ast <!--\; ???\; -->}\mathrm{\pi <!--\; ??\; -->}(I{J}^P=0{\frac{3}{2}}^{-<!--\; ???\; -->})$ could be candidates of ${\mathrm{\Lambda <!--\; ??\; -->}}_b$(5912) and ${\mathrm{\Lambda <!--\; ??\; -->}}_b$(5920), respectively. And ${\mathrm{\Sigma <!--\; ??\; -->}}_b^{\ast <!--\; ???\; -->}\mathrm{\rho <!--\; ??\; -->}(I{J}^P=0{\frac{5}{2}}^{-<!--\; ???\; -->})$ and $\mathrm{\Delta <!--\; ??\; -->}{B}^{\ast <!--\; ???\; -->}(I{J}^P=1{\frac{5}{2}}^{-<!--\; ???\; -->})$ are found in the energy regionof 6.5 ∼ 6.6 GeV. ${\mathrm{\Sigma <!--\; ??\; -->}}_c^{(\ast <!--\; ???\; -->)}\mathrm{\pi <!--\; ??\; -->}$ and ${\mathrm{\Sigma <!--\; ??\; -->}}_b^{(\ast <!--\; ???\; -->)}\mathrm{\pi <!--\; ??\; -->}$ are expected as compact states, while ${\mathrm{\Sigma <!--\; ??\; -->}}_c^{\ast <!--\; ???\; -->}\mathrm{\rho <!--\; ??\; -->}$, ${\mathrm{\Sigma <!--\; ??\; -->}}_b^{\ast <!--\; ???\; -->}\mathrm{\rho <!--\; ??\; -->}$, $\mathrm{\Delta <!--\; ??\; -->}{D}^{\ast <!--\; ???\; -->}$ and $\mathrm{\Delta <!--\; ??\; -->}{B}^{\ast <!--\; ???\; -->}$ are expected as molecular states.

[en] Highlights: • The pentagonal CN₂ nanoribbon is stable both in kinetics and thermodynamics. • The CN₂ nanoribbon is a semiconductor with a direct band gap of 1.5 eV, and the energy band structure is spin splitting. • An applied external electric field can transform the pentagonal CN₂ nanoribbon from semiconductor to metal. Cutting two-dimensional (2D) CN₂ sheet along specific crystallographic orientations to construct CN₂ nanoribbon, its electronic structure is investigated systemically. We show by first-principles calculations that the electronic properties of CN₂ nanoribbon exhibit response to applied electric field and strain. The lowest conduction band and highest valence bands of the spin-up and spin-down states approach to the Fermi level respectively with increasing the strength of the electric field and tensile strain. More interestingly, an applied electric field can transform the nature of the CN₂ nanoribbon from semiconductor to metal. These results provides us an efficient way to design spintronic devices based on the CN₂ nanoribbons.

[en] We make use of the Nambu-Jona-Lasinio (NJL) formalism and real-time finite-temperature field theory to calculate hadronic current correlation functions in the deconfined phase of quantum chromodynamics (QCD). Here, we consider both pseudoscalar and vector currents. Since the method used in the lattice analysis to calculate the spectral functions requires assumptions about the likelihood of a particular form for the spectral function, we believe our calculations will be useful to researchers who wish to calculate hadronic current correlation functions at finite temperature using lattice-based methods. Our model makes use of temperature-dependent coupling constants for the NJL model. We present various arguments that such temperature dependence is necessary, if the results of the model are to be consistent with what is known concerning QCD thermodynamics