[en] The weakest bound electron potential model (WBEPM) theory is used to calculate transition probabilities for individual lines in neutral fluorine, for which transition probability data are scarce. A coupled equation concerning energy ε and the radial expectation value < r> of the weakest bound electron is proposed to determine the parameters used in the calculation of transition probability. The accuracy of present results has been tested from comparisons with the most theoretical or experimental results presently available

No abstract available

[en] Graphical abstract: - Highlights: • Co-doped porous ZnO microspheres were synthesized. • 3 mol% Co-doped ZnO sensor showed the highest response to ethanol. • 3 mol% Co-doped ZnO sensor exhibited fast recovery property. • 3 mol% Co-doped ZnO sensor exhibited good selectivity and long-term stability. - Abstract: Porous Co-doped ZnO microspheres were prepared by a simple hydrothermal method combined with post-annealing. Co species existed as a form of divalent state in the sample and substituted Zn²⁺ sites in ZnO crystal lattice, which was affirmed by X-ray diffraction, UV–vis diffuse reflectance spectroscopy and X-ray photoelectron spectroscopy. The gas-sensing measurements demonstrated that the 3 mol% Co-doped ZnO sample showed the highest response value to 100 ppm ethanol at 350 °C, which were 5 folds higher than that of the pure ZnO sample. In addition, the 3 mol% Co-doped ZnO sensor exhibited fast recovery property, good quantitative determination, good selectivity and long-term stability. The superior sensing properties were contributed to high specific surface area combined with the large amount of oxygen vacancies originating from Co doping

[en] Highlights: • Hydrated salts were prepared into shape-stabilized phase change materials. • Phase segregation of the hydrated salts was inhibited. • Thermal conductivity of hydrated salts/EG composite was higher than others. - Abstract: A novel shape-stabilized phase change material (PCM) was developed by impregnation of hydrated salts into expanded graphite (EG) and further coated with paraffin wax. It was displayed by scanning electron microscope (SEM) and Fourier transform infrared spectroscopy (FT-IR) measurements that the hydrated salts were filled into pores or adhered onto the flakes of EG by physical interactions, including capillary forces and surface tension. It was revealed from differential scanning calorimetry (DSC) analysis that phase segregation was inhibited and subcooling weakened in the coated composite PCM. The melting and freezing enthalpy of the coated composite PCM can reach 172.3 kJ/kg at 32.05 °C and 140.8 kJ/kg at 17.11 °C, respectively. Also, the results of thermal gravimetric analysis (TG) suggested that the coated composite PCM had good thermal stability in the working temperature range from 25 to 50 °C. Furthermore, the enthalpy loss of melting and freezing was negligible after 100 cycles, indicating its good thermal reliabilities. The thermal conductivity of the coated composite PCM can be as high as 3.643 W/(m K). According to the obtained results, the coated hydrated salts/EG composite PCM enjoys high latent heat, good thermal reliability and high thermal conductivity. Apart from its favorable thermal properties, the cost of the coated hydrated salts/EG composite PCM was quite low, making it promising for low temperature thermal energy storage applications

[en] The Weakest Bound Electron Potential Model (WBEPM) theory is employed to calculate transition probabilities for Ne II in this paper. The parameters Z^*, n^* and l^* are determined through fitting the experimental value of energy level and the expectation value of radial distance. Compared with most experimental results presently available and the values of critical compilation, the present results are accurate and in good agreement with them. Simple calculation procedure and accurate results can be both obtained from the present method

[en] Highlights: • A mixture of hydrated salts were adopted as phase change materials. • Phase segregation of the hydrated salts was inhibited. • Subcooling was slightly mitigated. • Thermal cycling performance was greatly improved after PVP coating. - Abstract: A novel shape-stabilized phase change material composite was prepared by impregnating the mixture of hydrated salts (Na_2SO_4·10H_2O–Na_2HPO_4·12H_2O) into porous silica matrix obtained by sol–gel process and further coated with polyvinylpyrrolidone (PVP) to improve the thermal cycling performance. The chemical compatibility, morphology and phase change properties were investigated by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM), hot-stage polarizing optical microscope (HS-POM) and differential scanning calorimetry (DSC). Confined in the silica matrix, phase segregation of the hydrated salts was inhibited and subcooling was slightly mitigated. No leakage was observed during the solid–liquid phase transition even when the mass ratio of hydrated salts to silica was as high as 70:30. Results showed that the melting enthalpy of the composite can reach 106.2 kJ/kg with the melting temperature at 30.13 °C and there was no significant enthalpy loss after 30 thermal cycles

[en] The changes of the erythroid progenitors in mouse bone marrows irradiated by sublethal dose ⁶⁰Co γ-ray was investigated by tissus culture in vitro. The total number of BFU-E and CFU-E in the bone marrow of femur of normal mouse was 3.23 x 10³ and 3.97 x 10⁴ respective. Both number decreased to 0.3% and 0.5% respectively on the third day after irradiation at a dose of 6 Gy, and the number of nucleate cells in bone marrow decreased to 4.6% of the normal value, then began to increase on the fifth day. The data from our experiment demonstrated that the changes of decrease or increase of CFU-GM and CFU-E accompanied by the changes of nucleate cells. So the number of BFU-E and CFU-E can be used as an indicator for the function of hematopoietic organ

[en] Highlights: • Structure and properties of TiMoN/Si₃N₄ films dependent on the structure of Si₃N₄. • With increase of layer thickness, Si₃N₄ changed from crystalline to amorphous state. • TiMoN/Si₃N₄ films with crystalline Si₃N₄ show higher hardness than MoN_x/SiN_x films. • TiMoN/Si₃N₄ films all show lower COF than that of TiAlSiN/Si₃N₄ films. - Abstract: TiMoN/Si₃N₄ nano-multilayer films with different Si₃N₄ layer thickness were synthesized using magnetron sputtering by changing the Si target current. The TiMoN/Si₃N₄ nano-multilayer films exhibited strong microstructure and properties dependence on the structures of Si₃N₄ layer. When Si₃N₄ layer thickness (l_Si3N4) was smaller than 0.8 nm, Si₃N₄ layers maintained crystallization state, the as-deposited TiMoN/SiN_x films exhibited much higher hardness and comparable coefficient of friction (COF) than that of MoN_x/SiN_x films. With the further increase of l_Si3N4, Si₃N₄ layer transformed to amorphous state, the hardness of TiMoN/Si₃N₄ films decreased gradually from 29.9 to 20.1 GPa and COF increased from 0.55 to 0.72. It totally shows better tribological properties than TiAlSiN/Si₃N₄ nano-multilayer films as a result of incorporating molybdenum nitride

[en] Kinetics and radiosensitivity of human lymphocytes were studied by the techniques of monolayer agar culture and liquid culture in vitro. In the experiments of lymphocyte kinetics, PHA was designated as a motogen for T lymphocyte. LPS, MEBC and BSA were chosen as mitogens for B lymphocyte. The data from thses experiments showed that under the alone or combination stimulation of LPS, MRBC and BSA, B lymphocytes developed to form colonies in agar culture (0.3%) with the same manner. The stimulation of LPS to B lymphocytes was most significant. By the day 6 after seeding, the numbers of colonies in agar culture were maximal. Whereas the numbers decreased significantly by the day 8. The number of T lymphocyte colonies increased with culture time within 12 days. The peak of ³H-TdR incorporation into T lymphocytes in liquid culture occured at 5th day after seeding. The data above-mentioned demonstrated that the kinetics of lymphocytes cultured in two kinds of environments were different. The studies of the radiosensitivity of T lymphocytes showed that the decreasing in the number of colonies and rate of ³H-TdR incorporation varied in different dose ranges. In the range of 0∼1.0 Gy, r = -0.96, D₀ value was 1.71 Gy for TL-CFC in agar culture, r = -.96, D₀ value was 4.34 Gy for the proliferation T lymphocytes in liquid culture. In the range of 1.0∼6.0 Gy, r were -0.99 and -0.98, the D₀ were 5.88 and 7.36 Gy respectively. The declining tendency in colonies formed by BL-CFC was the same as that of TL-CFC, r = -0.97, for the range of 0∼1.0 Gy, r = -0.97, for the range of 1.0∼3.0, the D₀ values were 1.35 and 4.36 Gy respectively. The results from these experiments shown that the colony technique was a good method for the study in radiosensitivity

[en] Graphical abstract: CrTiAlMoN coatings exhibit much lower coefficient of friction and higher hardness than that of CrTiAlN and other Mo containing nitride coating. - Highlights: • Well-defined layer interfaces were observed by TEM. • CrTiAlMoN coatings exhibit higher hardness, lower COF and wear rate. • The hardness of these coatings are determined by the type of layer interfaces. • The COF of these coatings are related to Mo content and their oxidation behaviors. - Abstract: CrTiAlN and CrTiAlMoN nano-multilayer coatings were deposited by closed field unbalanced magnetron sputtering. TiMoN and CrTiMoN nano-multilayer coatings with same Mo_2N layer thickness were also prepared for comparison. The structure of these coatings is investigated by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). The mechanical and tribological properties were characterized and compared by nano-indentation and ball-on-disc test. It was found that these coatings were structured by fcc metal nitride phases (including CrN, TiN, AlN and Mo_2N) and the preferred orientation changed from (1 1 1) to (2 0 0) with the increase of Mo content. The TEM results showed that the coatings exhibited typical columnar structure and nano-multilayer structure with modulation periods ranged from 3.2 nm to 7.6 nm. Among these coatings, CrTiAlMoN coatings presented the highest hardness, lowest coefficient of friction (COF) and wear rate. The hardness of these nano-multilayer coatings were determined by layer interfaces: TiN/Mo_2N and AlN/Mo_2N layer interface showed benefit on hardness enhancement while CrN/Mo_2N layer interface led to a great hardness decrement. In comparison with the other as-deposited coatings, the low COF of CrTiAlMoN coatings was not only affected by Mo addition but also related to its oxidation behaviors.