[en] In the present work, the $K_S^{0}K$π system was analyzed in two-photon processes with (quasi)-real photons based on four data sets of the BESIII experiment at the center-of-mass energies of $\sqrt{s}$ = 3.773 GeV, 4.178 GeV, 4.226 GeV, and 4.416 GeV with a total integrated luminosity of L${}_{e^{+}{e}^{-<!--\; ???\; -->}}$ · dt = 8312.4 pb${}^{-<!--\; ???\; -->1}$. The goal was to investigate the pseudoscalar mesons η(1405), η(1475), and η${}_c$, which have been controversial in the process γγ → $K_S^{0}K$π in various e${}^{+}$e${}^{-<!--\; ???\; -->}$ experiments so far. In the data sets studied here, the η${}_c$ resonance could not be observed. Likewise, no significant structures were seen in the mass of the η(1405)- and the η(1475)-resonance in $K_S^{0}K$π-mass spectra. For the η(1405) resonance considered as a candidate glueball and the η(1475) resonance considered as the first radial excitation of the η′-resonance ($s\stackrel{¯<!--\; ??\; -->}{s}$ state), an upper limit of the product of the γγ-width and the branching ratio B(η(1405)/η(1475) → $K\stackrel{¯<!--\; ??\; -->}{K}$π) was determined in the present work, respectively. These are ${\mathrm{\Gamma <!--\; ??\; -->}}_{\mathrm{\gamma <!--\; ??\; -->}\mathrm{\gamma <!--\; ??\; -->}}$(η(1405))-B(η(1405) → $K\stackrel{¯<!--\; ??\; -->}{K}$π) < 136 eV and ${\mathrm{\Gamma <!--\; ??\; -->}}_{\mathrm{\gamma <!--\; ??\; -->}\mathrm{\gamma <!--\; ??\; -->}}$(η(1475))-B(η(1475) → $K\stackrel{¯<!--\; ??\; -->}{K}$π) < 169 eV at a 90% confidence level, assuming that the η(1405)- and the η(1475)-resonances have masses of 1.4139 GeV/c${}^2$ and 1.475 GeV/c${}^2$, respectively, and decay widths of 0.048 GeV and 0.09 GeV, respectively. Furthermore, the upper limits of the above products were measured and plotted at a 90% confidence level considering the systematics of the mass and width of the η(1405) and η(1475) resonances.

No abstract available

[en] Highlights: •Li₃VO₄/C/rGO ternary composite with honeycomb-like structure is prepared by taking advantage of spray drying method and polystyrene (PS) soft template. •Li₃VO₄/C/rGO composite electrode possesses rapid Li⁺ ions intercalation kinetics and good structure integrity. •Li₃VO₄/C/rGO composite exhibits outstanding high-rate performance and long cycle-life (the high reversible capacity of 312 mAh g⁻¹ can be maintained after 1000 cycles at 10C). -- Abstract: Li₃VO₄/C/rGO (HC-LVO/C/G) ternary composite with honeycomb-like structure is successfully prepared through a simple spray drying method with polystyrene (PS) microspheres as soft template. In this characteristic structure, carbon-coated Li₃VO₄ nanoparticles are well wrapped by rGO sheets and uniformly distributed within the honeycomb-like micrometer-sized clusters. The double coating layers of amorphous carbon and rGO can avoid the direct exposure of Li₃VO₄ nanoparticles to the electrolyte and enhance the electronic conductivity. Meanwhile, the honeycomb-like structure can shorten the diffusion paths of Li⁺ ions and favors the relaxation of the strain/stress during cycling. The resultant HC-LVO/C/G composite exhibits significantly improved high-rate performance and long cycle-life (the high reversible capacity of 312 mAh g⁻¹ can be maintained after 1000 cycles at 10 C) compared with the contrastive Li₃VO₄/C composite synthesized by a typical solid-state reaction method.

[en] In recent years, a large number of pre-clinical and clinical investigations have indicated that stereotactic body radiation therapy (SBRT) can not only kill cancer cells directly, but also induce the immunogenic death of cancer cells through releasing numerous tumor-associated antigens and damage-associated molecular patterns to form in situ tumor vaccine. CD₈ (+) T cells in lymph nodes are cross-sensitized by activated antigen-presenting cells. SBRT initiates local and systemic anti-tumor immune response. Moreover, SBRT can induce the abscopal effect if combined with immunotherapy. In addition, SBRT improves the microenvironment for tumor immunosuppression and enhances the sensitivity of tumors to immunotherapy. This article reviews the research advances in the synergistic mechanisms for combination therapy with SBRT and immunotherapy. (authors)

[en] Nano/micro-indentation has been extensively used to examine elastic properties and creep of cement-based materials. However, there have been inconsistencies in the measured elastic moduli and debate on the creep mechanism of calcium (alumino) silicate hydrates (C-(A-)S-H). To bring new insights, we examined the deviatoric stress-induced preferred orientation of calcium aluminosilicate hydrate (C-A-S-H), portlandite, and ettringite compacts, using synchrotron-based X-ray diffraction. Intense preferred orientations were observed in C-A-S-H compacts, and the c-axis of unit cells is highly aligned with the compression direction; weaker c-axis related fiber-type texture formed in portlandite and ettringite. Higher humidity, greater compacting pressure, and/or increased duration of the pressure intensified the C-A-S-H preferred orientation, which is facilitated by gel-pore water lubrication. This pressure-induced time-dependent preferential re-orientation of crystallites can contribute to the creep of cement-based materials, and it may cause overrepresentation of the soft c-axis of C-(A-)S-H unit-cell in nanoindentation experiments and underestimation of Young's modulus.

[en] In this work, in order to analyse the magnetic field of rectangular current-carrying coil, a simulation with the magnetostatic function of the ANSOFT Maxell 3D software has been carried out. The characteristics of the magnetic field distribution have been analysed based on the results of simulation. In addition, an experiment aimed to measure the magnetic induction intensity at a point on the central axis of the rectangular coil has been designed to verify the simulation results. The results show that the error between the simulation results and the actual measurement is 1.24%, which proved the accuracy of the simulation. (paper)

[en] In this paper, several different magnetic shielding schemes are proposed, the finite element static magnetic field analysis method is introduced, and the finite element method is used to simulate these methods. According to the calculation results, we analysed different magnetic shielding schemes, the results show that the opening will significantly reduce the magnetic shielding efficiency; under the same materials, the multi-layer magnetic shielding effect is significantly improved; when the opening is parallel to the direction of the magnetic induction intensity, the magnetic shielding has a better effect; when the direction of the magnetic field is unknown, the two-layer magnetic shielding opening direction can be orthogonal to improve the magnetic shielding effect. (paper)

[en] A high di/dt 4H-SiC thyristor with ‘-shaped’ n-base is proposed and investigated by simulation. Unlike the conventional SiC thyristors, the proposed SiC thyristor features a lightly-highly-lightly doped (‘-shaped’) n-base. By modulating the concentration difference of the top p⁺-n emitter junction its injection efficiency increases. An extra electric field is induced by the existence of an abrupt high-low junction in n-base to force the transit of holes and therefore reduce the recombination. As a result, the turn-on time and turn-on di/dt of the new SiC thyristor are 145 ns and 948 A/cm²/μs, respectively, which are reduced by approximately 72% and increased by approximately 400% compared to conventional SiC thyristors (turn-on time is 514 ns and di/dt is 188 A/cm²/μs). (paper)

[en] Objective: This study aimed to explore the correlation between different body components and bone mineral density in healthy adults. Methods: A total of 306 non-manual subjects, 161 males and 145 females, were selected from the physical examination center of our hospital from June to September 2019. They were divided into control group, overweight group, and obese group according to body mass index. The muscle mass and fat mass, body fat content, trunk fat mass, upper limb and thigh fat mass, bone density of femoral neck and lumbar vertebra, and bone mineral salt content of the whole body were measured by dual-energy X-ray absorptiometry. Results: Body mass index, systolic blood pressure, diastolic blood pressure, femoral neck bone mineral density, bone mineral salt content, fat mass, muscle mass, upper limb fat mass, thigh fat mass, and trunk fat mass in the overweight group and obese group were all higher than those in the control group (P<0.05). The fat mass, muscle mass, upper limb fat mass, and trunk fat mass were positively correlated with the femoral neck bone mineral density, total lumbar vertebra bone mineral density, and bone mineral salt content (P<0.05). In addition, thigh fat mass was positively correlated with femoral neck bone mineral density and total lumbar spine bone mineral density, whereas body fat content was negatively correlated with bone mineral salt content. Conclusion: Body composition was related to bone mineral density and bone mineral salt content, and the correlation between different body composition indexes, and bone mineral density, and bone mineral salt content was different. (author)

[en] According to the basic motion requirements of quadruped robots, the mechanism of quadruped robot with 12 degrees of freedom is designed, and the dynamic model of single leg and the description equation of foot position are established. In order to solve the problem of the joint torque optimization of quadruped robots in swing phase, a method of generating the foot trajectory based on dynamics is proposed. Computer simulation results show that the proposed method can reduce the torque output of quadruped robot joints when the quadruped robots are in swing phase and prove the reliability of the proposed method for quadruped robot in the foot trajectory generation. Finally, because the leg structure of quadruped robot has the general characteristics of typical series linkage mechanism, it can also be extended to other series mechanisms with multiple connecting rods. (paper)