[en] The AP1000 nuclear power plant is the third generation nuclear power technology jointly developed by China and the United States. AP1000 nuclear power plant is designed by the Westinghouse consortium and constructed by the State Nuclear Power Technology Company which is responsible for the self- reliance supporting project through technology introduction. Due to the engineering particularity, the construction involves many Chinese and American standard matching and compatibility problems. Through comparing and analyzing material and test requirement in standards, connected with relevant problems of AP1000 hydrogen piping design, it hopes to provide reference for the hydrogen piping design in domestic nuclear power plant. (author)

[en] Verifying calculational model of detector is important to calculate its detection efficiency with Monte Carlo method. HPGe detector crystal dead layer thickness and cold finger size were determined by Monte Carlo simulation along with experiment. The results show that when the crystal dimensions determined are used to calculate the detection efficiency, in the energy range of 59.54-1408.1 keV the relative deviation between simulated and experimental results is under 5%, which is validated by some experiments. (authors)

[en] Service water system (SWS) of AP1000 nuclear power plant in pipe gallery adopts high density polyethylene (HDPE) as the pipe material, and it is for the first time to use this kind of material in the SWS system in domestic nuclear power plant. This paper analyzes the characteristic of HDPE material, takes into account the features of Haiyang pipe gallery, and then makes a comparison on butt-fusion and electro-fusion of HDPE pipe welding process. SWS, being the nuclear power plant final heat sink, requires high reliability, so butt-fusion is the preferable weld method. It is hoped to provide reference for follow-up project design and construction. (authors)

[en] Objective: To investigate the feasibility and effect of recanalization of inferior vena cava with percutaneous transluminal angioplasty(PTA)by Inoue-balloon. Methods: Eighty-nine patients with Budd-chiari syndrome (BCS )were treated with PTA by Inoue-balloon. Results: After PTA, the median (interquartile range)diameter of hepatic segment inferior vena cava increased from 0.00 (0.20-0.00) cm to 1.90 (2.00 1.47)cm; (P < 0.001), and the mean pressure of inferior vena cava reduced from (20.63 ± 7.22) mmHg to (12.13 ± 5.60) mmHg; (P < 0.001); with only less serious complications as rupture in two cases and without need of prior minor diameter balloon dilation in Inoue-balloon PTA. Conclusion: The advantages of Inoue- balloon PTA for BCS are more reliable and facile than those of polyethylene balloon, and may take the place in the foreseen future. (authors)

[en] Objective: Radiation synovectomy with ¹⁵³S-citrate-hydroxyapatite (HA) was reported of promising effect. The aim of the current study was to investigate the efficacy of the technique in treating rheumatoidarthritis (RA). Methods: Fifty-seven RA patients (103 knees) with thickened synovium underwent the treatment with intra-articular injection of 185 MBq (0.5-1 ml) ¹⁵³Sm-citrate-HA. Based on the changes of clinical signs such as articular pain, edema, etc. after treatment, the therapeutic efficacy was graded along with X-ray grading. Results: Efficacy was observed 1 week after injection and persisted up to 6 months. The overall efficiency was 98.1%. There were 100% and 91.3% patients in X-ray grade I and II responding to the treatment respectively. Conclusion: Radiation synovectomy with intra-articular injection of ¹⁵³Sm-citrate-HA in patients with RA could be a simple, safe and effective therapy. (authors)

[en] Two fluoro-substituted 2-pyrazoline derivatives, 1-phenyl-3-(4-methoxyphenyl)-5-(4-fluorophenyl)-2-pyrazoline and 1-phenyl-3-(4-methoxyphenyl)-5-(2-fluoro-phenyl)-2-pyrazoline have been synthesized and characterized by elemental analysis, IR, UV-Vis and fluorescence spectra. The crystal structure of 1 has been determined by X-ray single crystal diffraction. For the two compounds, density functional theory (DFT) calculations of the structures and natural population atomic charge analysis (NPA) have been performed at B3LYP/6-311G** level of theory. By using TD-DFT method, electron spectra of 1 and 2 have been predicted, which are very approximate with the experimental ones. Comparative studies on 1 and 2 indicate that the location change of fluorine atom in 5-position phenyl ring of 2-pyrazoline does not make significant change of geometries and electronic transition bands, but it leads to evident change of atomic charge distributions and peak intensities of UV and fluorescence spectra

[en] Highlights: • Sulfureted deactivated V₂O₅-MoO₃/TiO₂ displays excellent performance and reproducibility in gaseous Hg⁰ capture. • The cost performance of sulfureted deactivated V₂O₅-MoO₃/TiO₂ for Hg⁰ capture is outstanding. • Deactivated V₂O₅-MoO₃/TiO₂ can be safely disposed. • The capturing capacity of sulfureted MoO₃/TiO₂ moderately decreases after the impregnation of V₂O₅ and CaSO₄. • Sulfureted deactivated V₂O₅-MoO₃/TiO₂ offers a significant advantage in recovering Hg⁰ from smelting flue gas. The reduction of Hg emissions from non-ferrous metal smelting was proposed in the Minamata Convention. Regenerable sulfureted MoO₃/TiO₂, which displayed excellent performance in capturing gaseous Hg⁰, was once developed by us to recover gaseous Hg⁰ in smelting flue gas (SFG) for centralized control. Recently, a large amount of spent commercial selective catalytic reduction catalysts (for example V₂O₅-MoO₃/TiO₂) mostly deactivated by CaSO₄ was formed, creating a need for their safe disposal. As the main constituent of deactivated V₂O₅-MoO₃/TiO₂ is MoO₃/TiO₂, deactivated V₂O₅-MoO₃/TiO₂ was sulfureted to capture gaseous Hg⁰ from SFG for its safe disposal and the effects of V₂O₅ and CaSO₄ on Hg⁰ adsorption onto sulfureted MoO₃/TiO₂ were investigated. Although the capturing capacity of sulfureted MoO₃/TiO₂ moderately decreased after the impregnation of V₂O₅ and CaSO₄, sulfureted deactivated V₂O₅-MoO₃/TiO₂ still displayed excellent performance and reproducibility in gaseous Hg⁰ capture. Meanwhile, the cost performance of sulfureted deactivated V₂O₅-MoO₃/TiO₂ for Hg⁰ capture was outstanding as deactivated V₂O₅-MoO₃/TiO₂ needs to be safely disposed. Therefore, deactivated V₂O₅-MoO₃/TiO₂ can be sulfureted as a regenerable and low-cost sorbent that is effective in recovering gaseous Hg⁰ from SFG, as well as being a cost-effective and environmentally friendly method for the safe disposal of spent V₂O₅-MoO₃/TiO₂.

[en] Highlights: • Sulfureted HPW/γ-Fe₂O₃ shows an excellent capacity to enrich gaseous Hg⁰ from low concentrations to ultra-high concentrations. • Sulfureted HPW/γ-Fe₂O₃ exhibits excellent para-magnetism, enabling it to be magnetically reclaimed after Hg⁰ capture. • Sulfureted HPW/γ-Fe₂O₃ is regenerated by re-sulfuration without decreasing the Hg⁰ capture performance. Conversion of gaseous elemental mercury (Hg⁰) to particulate-bound mercury (Hg^P) by the injection of disposable sorbents or to gaseous oxidized mercury (Hg²⁺) by catalysts is not suitable to control Hg⁰ emissions from power plants burning Hg-rich coal because removed Hg may be released as secondary pollution, particularly during the employment of fly ash and desulfurization gypsum. In this study, sulfureted phosphotungstic acid modified γ-Fe₂O₃ (HPW/γ-Fe₂O₃) was employed as a magnetic and reproducible sorbent to recover gaseous Hg⁰ in coal-fired flue gas for the centralized control. Sulfureted HPW/γ-Fe₂O₃ showed an excellent capacity to enrich gaseous Hg⁰ from low concentrations to ultra-high concentrations (>10 mg m⁻³), which benefited to condensing it into liquid Hg. Moreover, sulfureted HPW/γ-Fe₂O₃ exhibited excellent para-magnetism, enabling it to be magnetically reclaimed after Hg⁰ capture; this magnetization did not disappear after multiple thermal desorption of Hg⁰ due to its excellent thermal stability. Furthermore, sulfureted HPW/γ-Fe₂O₃ was regenerated by re-sulfuration without decreasing the Hg⁰ capture performance. Therefore, gaseous Hg⁰ recovery using sulfureted HPW/γ-Fe₂O₃ is a promising, economical-effective, and eco-friendly technology for the centralized control of Hg pollution emitted from power plants that burn coal with a high Hg content.

[en] Highlights: • TiO₂ shows a novel support effect on ZnS for Hg⁰ capture. • The bond strength of Zn-S in S-Zn-O is significantly weaker than that in S-Zn-S as Zn²⁺ preferred to O²⁻ than S²⁻. • The loading of ZnO significantly improved the Hg⁰ adsorption ability of TiO₂-S. • The amount of S²⁻ on TiO₂-S that can bond with physically adsorbed Hg⁰ significantly increases after ZnO loading. • ZnS/TiO₂ offers a significant advantage in the urgent disposal of liquid Hg⁰ leakage indoors as a co-benefit of air purifiers. Effectively weakening the bond strength of Zn-S in S-Zn-S on ZnS is of great significance to the improvement of its performance for the urgent disposal of liquid Hg⁰ leakage indoors. In this work, ZnS was loaded on three common supports (i.e., TiO₂, SiO₂, and Al₂O₃) to further improve its performance for capturing high concentrations of Hg⁰ indoors. After being loaded on TiO₂, the S-Zn-O bond was present on ZnS, and the bond strength of Zn-S in S-Zn-O was significantly weaker than that in S-Zn-S because Zn²⁺ preferred to O²⁻ than S²⁻. Hence, physically adsorbed Hg⁰ was much easier to bond with S in S-Zn-O than that in S-Zn-S to form HgS. Therefore, TiO₂ showed a novel support effect on ZnS for Hg⁰ capture, and the Hg⁰ capture performance of ZnS/TiO₂ was greatly better than those of ZnS, ZnS/SiO₂, and ZnS/Al₂O₃. Moreover, the promotion mechanism of ZnO loading on Hg⁰ adsorption onto TiO₂-S was discovered after comparing the Hg⁰ adsorption kinetic parameters of TiO₂-S and ZnS/TiO₂. The promotion of ZnO loading was primarily related to the notable increase in the content of S²⁻ that can bond with physically adsorbed Hg⁰, which predominantly resulted from the strong interaction of ZnO/TiO₂ with H₂S.

[en] Because of the efficiency and heating problem, the single-phase BUCK converter cannot be applied to the situation of low voltage and large current. Under the same stress conditions, the multiphase parallel BUCK converter cannot only reduce the output ripple, improve the converter efficiency, but also reduce the volume of the converter. The four-phase interleaved synchronization BUCK converter is used as the research object, and the corresponding mathematical model was established to describe the instantaneous ripple of the converter. Finally, the model was built with Simulink to verify the simulation. The simulation results show that the four phase synchronous rectifier improves the output current and reduces ripple compared with single-phase. (paper)