[en] Two isostructrual heterometallic iodoplumbates [Y(DMF)_8]_2_n[Pb_7M_2I_2_2]_n [M=Cu(1), Ag(2)] have been prepared. Chargely balanced by [Y(DMF)_8]"3"+, [Pb_7M_2I_2_2]_n"6"n"− displays a 1D zigzag chain constructed from MI_4 tetrahedron and Pb_7I_2_4 unit similar to a fragment of commonly observed (PbI_3)_n"n"− chain. Their band gaps (Eg) can be estimated as 2.66 and 2.72 eV, revealing potential semiconducting properties. Interestingly, thermochromism exhibits different response to the temperature for two compounds, which is verified by the diffuse-reflectance UV–visible spectra and crystallographic data at different temperatures. Moreover, this phenomenon is attributed to the difference of heterometal Ag and Cu(I). - Graphical abstract: Two isostructrual heterometallic iodoplumbates [Y(DMF)_8]_2_n[Pb_7M_2I_2_2]_n [M=Cu(1),Ag(2)] have been prepared. [Pb_7M_2I_2_2]_n"6"n"− displays a 1D zigzag chain constructed from MI_4 tetrahedron and Pb_7I_2_4 unit similar to a fragment of commonly observed (PbI_3)_n"n"− chain. Interestingly, the thermochromism for two compounds exhibits different response to the temperature, which is attributed to the difference of heterometal Ag and Cu. - Highlights: • Two isostructrual heterometallic iodoplumbates have been prepared. • Single-crystal-X-ray diffraction data were collected at different temperatures. • Spectroscopic characterization showed semiconducting and thermochromic properties. • The difference of thermochromic properties for two compounds was studied

[en] Reuse of liquid effluents in inland nuclear power plants (NPPs) and discharge reduction of liquid effluents to environment is an effective way to protect water resources, and it is a necessary choice for inland NPPs to meet energy development plan and major safety requirements of site selection. The reusing feasibility of liquid effluent is studied based on design and operation experiences of NPPs. The results show that the recycling of treated laundry liquid in hot laundry and reusing of floor drains in reactor cavity and spent fuel pit cooling system are practicable, and can reduce the discharge of liquid effluents to environment by 8400 m³ (Two units per year) accounting for the reduction of 51.8% of its total amount, and the reduced discharge of radioactivity in liquid effluents to environment by 4.8% 10⁵ Bq accounting for the reduction of 36.9% of its total radioisotope amount. (authors)

[en] This paper proposed a fault diagnosis method based on radial basis function neural network (RBF), and this mthod could effectively solve the diagnosis problem of connection lines between interconnected regions. This method divides the large power grid into several regions through the network overlapping partition, and after the fault occurs, the RBF neural network diagnosis module corresponding to the area corresponding to the alarm information is selectively triggered according to the alarm information.

The simulation results show that this method can not only diagnose faults occurring in different regions, but also can effectively diagnose faults occurring in Interregional tie lines. This method is simple and effective, can make up for the shortcomings of the fault diagnosis method of the existing grid partition fault in the connection line fault diagnosis and handle all kinds of complex fault conditions, and has good fault tolerance ability. (paper)

[en] It has been proved that different blade loading distributions between tip and hub has a significant effect on centrifugal impeller performance, but the effect of loading difference at different location along the stream has not been fully understood. In this paper, several blades were modelled by a three-dimensional inverse design method, in which the impellers are defined by the blade loading distribution at its tip and hub and the flows are computed numerically by a commercial CFD code. Firstly, two impellers were modelled using the same distribution at the hub but giving different distributions at tip. The results show that the impeller with a smoother tip loading distribution performs better. At design flow rate, the total pressure ratio is found to be 1.8% higher and the efficiency rises 1.36% as well. Then a further research about the effect of increasing tip load at different parts along the flow path was carried out. Further analysis indicates that adding the load at the fore part of tip could increase the efficiency at design flow rate and brings more uniform impeller exit flow. However, the surge margin was narrowed by such change. Besides, adding the v _ur at the aft part of tip will promote the pressure ratio, with no adverse effect on the stable operation range. (paper)

[en] Highlights: • Solubility of SO₂ in [N₂₂₂₄][Met] was measured for the first time. • Low absorption enthalpy, the fast absorption process, recycling four times. • RETM was used to correlate the experimental data. -- Abstract: Solubility of SO₂ in [N₂₂₂₄][Met] was measured at temperature from 313.2 to 333.2 K and pressure up to 1.8 bar. The [N₂₂₂₄][Met] absorbed SO₂ at high speed and could be recycled for four times. The Reaction Equilibrium Thermodynamic Model (RETM) was used to correlate the experimental data, Henry’s constant (H), reaction equilibrium constant (K⁰), and thermodynamic properties (${{\mathrm{\Delta }}_{r}H}_m^0$, ${{\mathrm{\Delta }}_{r}G}_m^0$, ${{\mathrm{\Delta }}_{r}S}_m^0$, $\mathrm{\Delta }{H}_{\mathit{phy}}\mathrm{a}\mathrm{n}\mathrm{d}\mathrm{\Delta }{H}_{\mathit{chem}}$) were derived. Considering the absorption capacity and low absorption enthalpy, as well as the fast absorption process, [N₂₂₂₄][Met] is thought to be a promising absorbent to ordinary solvent as a desulfurizer.

[en] Understanding the electronic properties of actinide oxides under pressure poses a great challenge for experimental and theoretical studies. Here, we investigate the electronic structure of cubic phase uranium dioxide at different volumes using a combination of density functional theory and dynamical mean-field theory. The ab initio calculations predict an orbital-selective insulator-metal transition at a moderate pressure of ~45 GPa. At this pressure the uranium's 5f_5/2 state becomes metallic, while the 5f_7/2 state remains insulating up to about 60 GPa. In the metallic state, we observe a rapid decrease of the 5f occupation and total angular momentum with pressure. Simultaneously, the so-called "Zhang-Rice state", which is of predominantly 5f_5/2 character, quickly disappears after the transition into the metallic phase.

[en] Carbon quantum dots (CQDs) with peroxidase-mimicking activity were successfully prepared from litchi rind. A colorimetric method for glucose determination was developed based on etching of gold nanorods (GNRs) using CQDs as peroxidase mimetic. The glucose oxidase-catalyzed oxidation of glucose leads to the generation of H₂O₂ which oxidizes added iodide under formation of elemental iodine under the catalytic action of CQDs. Iodine then etches the GNRs along the longitudinal direction due to the higher reaction activities at the tips of GNRs. This results in a stepwise decrease in the maximum absorption wavelength of the GNRs, from initially 953 nm to finally 645 nm. Under the optimized conditions, the shift in the maximum absorption wavelength decreases linearly in the 0.01–2.0 mM glucose concentration range, and the detection limit is 3.0 μM. Importantly, this method was applied to the determination of glucose in human serum. It is perceived that the CQDs are valuable peroxidase mimics due to their ease of preparation, low costs and stable catalytic activity.

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[en] The fabrication of nanocomposite structures for Nano-Optics is facing many challenges due to the special performance requirements. In this work, a novel Ag nanoprism@SiO₂@QD composite nanostructure is designed and fabricated to meet the desire of optical experiments. This material has good morphology and high monodispersity, and quantum dots can stably attach to the silica layer through chemical bonds. Simulation results confirm that this nanostructure can generates a Rabi splitting with a maximum value of 112 meV. Our coupling system creates a new combination of Ag nanoprisms and quantum dots, providing a high performance nanostructure for future photonic systems.

[en] Highlight• The multi-component gases competitive adsorption on residual coal under goaf conditions was investigated. • The adsorption quantity of gases on coal surface follows the sequence of O₂ > CH₄ > N₂ under goaf conditions. • The desorbed gas can affect the interaction between coal and air, hindering the spontaneous combustion of residual coal. To investigate the multi-component gases competitive adsorption on residual coal under goaf conditions, this paper carried out a series of studies based on Monte Carlo simulation. The results show that the adsorption quantity of gases on coal surface follows the sequence of O₂ > CH₄ > N₂ under goaf conditions. In addition, with the stepwise increase of the molar ratios of CH₄, the adsorption quantity of CH₄ also continues to increase while the adsorption quantity of air gradually decreases. In the goaf conditions, the desorbed gas can affect the interaction between coal and air, hindering the spontaneous combustion of residual coal.

[en] Extracellular vesicles (EVs) are nano vesicular structures that are secreted by almost all kinds of cells. Exosomes are small EVs derived from endosomes, with a diameter between 30–100 nm. Tumour-derived exosomes carry many molecules and factors from tumour cells. These exosomes are recognized and taken up by immunocytes. However, tumour-derived exosomes can not only suppress immune cell functions but also help tumours escape immune surveillance in the tumour microenvironment. The present work investigated the effect of exosomes derived from genetical modified K562 cells (GMK cells), which express IL-15, IL-18 and 4-1BBL (TNFSF9) on their surface. The results showed that these GME exosomes, carrying IL-15, IL-18 and 4-1BBL proteins similar to their host cells, could activate NK cells, increase the cytotoxicity of NK cells on some tumour cells in a short treatment (4 h) and promote NK cells proliferation. However, with an extended treatment time (48 h), these exosomes could inhibite the cytotoxicity of NK cells by inhibiting activated receptor expression on NK cells. These results indicated the bifacial effects of GMK exosomes on NK cells, which will be helpful to explore the possibility of using transformed exosomes as an anti-tumour immune vaccine or a therapeutic tool in future.