[en] Spin-dependent diffraction occurs in helimagnet-related transport processes. In this work, we investigated quantum pumping properties in the normal-metal/helimagnet/normal-metal heterostructure driven by two out of phase time-dependent gate potentials. At the condition when one of the diffracted beams goes out of the horizon the pumped charge and spin currents demonstrate sharp dips and rises as a function of the helimagnet spiral wave vector q. At small and large q's, the transmission and pumping properties approach the behaviors of a ferromagnet and an insulating barrier, respectively. For different helimagnet spiral periods, the diffracted angles are different. As a result, the pumped charge and spin currents demonstrate multiple maximal and minimal peaks as a function of q, hence, sensitively depend on the helimagnet spin configuration. All the pumping properties can be interpreted by the quantum gate-switching mechanisms.

[en] The purpose to build the integrated information system of Plan Budget Evaluation (JYK) is to ensure that nuclear power companies under CNNC can better use the JYK management system. Through the system, the enterprise operation management, economic activity analysis and strategic objectives are combined effectively. The structure and mode of the system are built based on analysis of the status of domestic and foreign enterprises on plan, budget and performance evaluation, as well as considering the characteristics of production management and performance evaluation in nuclear power companies. The JYK focuses on key technical points of JYK, and will facilitate completion of operational target and key tasks of nuclear companies, and promote the improvement of the overall management level. (author)

[en] We evaluate the performance of standard and modified MPn procedures for a wide set of thermochemical and kinetic properties, including atomization energies, structural isomerization energies, conformational energies, and reaction barrier heights. The reference data are obtained at the CCSD(T)/CBS level by means of the Wn thermochemical protocols. We find that none of the MPn-based procedures show acceptable performance for the challenging W4-11 and BH76 databases. For the other thermochemical/kinetic databases, the MP2.5 and MP3.5 procedures provide the most attractive accuracy-to-computational cost ratios. The MP2.5 procedure results in a weighted-total-root-mean-square deviation (WTRMSD) of 3.4 kJ/mol, whilst the computationally more expensive MP3.5 procedure results in a WTRMSD of 1.9 kJ/mol (the same WTRMSD obtained for the CCSD(T) method in conjunction with a triple-zeta basis set). We also assess the performance of the computationally economical CCSD(T)/CBS(MP2) method, which provides the best overall performance for all the considered databases, including W4-11 and BH76.

[en] Imidazole-modified silica adsorbent with chloride as counter ion (SilprIm-Cl) was synthesized and characterized by scanning electron microscope, infrared spectra, thermogravimetric analysis, elemental analysis and BET analysis. The adsorption of chromium(VI) from aqueous solutions onto the SilprIm-Cl was investigated at varying pH, contact time, initial Cr(VI) concentration, adsorbent amount and temperature. The experimental results showed that the modification of silica with imidazole enhanced significantly the adsorption capacity for Cr(VI). The SilprIm-Cl was of primary anion-exchange adsorption nature, pH and excess Cl⁻ ions in solutions affected significantly the adsorption of chromium(VI). The adsorption isotherms would be well defined with Langmuir model instead of Freundlich model. The adsorption process follows the pseudo-second-order kinetics. The maximum adsorption capacity of Cr(VI) of 47.79 mg g⁻¹ with an initial Cr(VI) concentration of 150 mg L⁻¹ was achieved at pH of 2.0. The adsorption–desorption experiments of the SilprIm-Cl exhibited that the adsorbent could be regenerated and reused eight times at least by simple washings with NaCl and water in turn.

[en] The necessity and feasibility of amending the Code of Practice of Quality Assurance for Nuclear Power Plant Safety (Code of Practice) were analyzed by combining practical work and literature study. It came to the conclusion that with the development of quality management of nuclear power plant, it is difficult for the Code of Practice to fully exert its directive and regulative role for the fact that in practice there are apparent flaws in applying the Code of Practice. Therefore, it's essential to amend it. Under the background of that the nuclear safety regulation should be intensified after Fukushima Nuclear Accident, with the amending of corresponding law and rules and more experienced in quality assurance, the amending of the Code of Practice is feasible. (authors)

[en] Highlights: • Five imidazole-modified silica adsorbents were synthesized. • The five adsorbents are of primary anion-exchange and electrostatic nature. • The electrostatic nature was affected by the methyl group of imidazolium ring. • The five adsorbents are suitable for adsorption of 2,4-DNP with low pK_a value. • The adsorbent was regenerated and reused ten times by washings with HCl and water. -- Abstract: The objective of this work was to improve the understanding the influence of the methyl group at different positions of imidazolium ring on the adsorption behaviors of imidazole-modified silica adsorbents. Five adsorbents named as SilprImCl, SilprM₁ImCl, SilprM₂ImCl, SilprM₄ImCl and SilprM₁M₂ImCl were synthesized using imidazole, 1-methylimidazole, 2-methylimidazole, 4-methylimidazole and 1,2-dimethylimidazole, respectively. These adsorbents were characterized by scanning electron microscope, infrared spectra, thermogravimetric analysis, elemental analysis and BET analysis. Firstly, phenol, 2-nitrophenol (2-NP), 3-nitrophenol (3-NP), 4-nitrophenol (4-NP) and 2,4-dinitrophenol (2,4-DNP) were used as adsorbates to investigate the selectivity of SilprImCl and its adsorption capacities followed the order of 2,4-DNP ≫ 4-NP > 2-NP ≫ 3-NP > phenol. Therefore, 2,4-DNP was used to investigate the adsorption behaviors of the five adsorbents. It was inferred that the adsorbents are of primary anion-exchange and electrostatic nature. The electrostatic nature was affected significantly by the methyl group at different positions of imidazolium ring. The adsorbed amounts of 2,4-DNP decreased in the order of: SilprM₁M₂ImCl ≈ SilprM₁ImCl > SilprM₄ImCl > SilprM₂ImCl > SilprImCl. The adsorption–elution experiments indicated that 2,4-DNP can be removed from aqueous solutions by a SilprM₄ImCl packed column and the recovery of 91.6% was obtained. The adsorbent could be regenerated and reused ten times at least by simple washings with HCl and water in turn

[en] Nanocomposite hydrogels with interpenetrating polymer network (IPN) structure based on poly(ethylene glycol) methyl ether methacrylate modified ZnO (ZnO-PEGMA) and 4-azidobenzoic agarose (AG-N_3) were prepared by a one-pot strategy under UV irradiation. The hydrogels exhibited a highly macroporous spongelike structure, and the pore size decreased with the increase of the ZnO-PEGMA content. Due to the entanglement and favorable interactions between the two crosslinked networks, the IPN hydrogels exhibited excellent mechanical strength and light transmittance. The maximum compressive and tensile strengths of the IPN hydrogels reached 24.8 and 1.98 MPa respectively. The transparent IPN hydrogels transmitted more than 85% of visible light at all wavelengths (400–800 nm). The IPN hydrogels exhibited anti-adhesive property towards Gram-negative Escherichia coli (E. coli) and Gram-positive Staphylococcus aureus (S. aureus), and the bactericidal activity increased with the ZnO-PEGMA content. The incorporation of ZnO-PEGMA did not reduce the biocompatibility of the IPN hydrogels and all the IPN nanocomposites showed negligible cytotoxicity. The present study not only provided a facile method for preparing hydrogel nanocomposites with IPN structure but also developed a new hydrogel material which might be an excellent candidate for wound dressings. - Highlights: • IPN hydrogel nanocomposites were prepared by a one-pot strategy. • The maximum compressive and tensile strengths reached 24.8 and 1.98 MPa. • IPN hydrogels displayed excellent antibacterial activity and cytocompatibility. • This study provided a facile method for preparing IPN hydrogel nanocomposites.

[en] Graphical abstract: - Highlights: • Cd_0.65Zn_0.35S-TiO₂ nanotube is fabricated by a hydrothermal sulfuration method. • The hydrothermal temperature affects the composite's crystallinity and morphology. • Hydrothermal treated sample at 120 °C shows superior H₂ evolution activity. • Enhanced activity is due to the increased crystallinity and 1-D tubular structure. - Abstract: Titania nanotube-Cd_0.65Zn_0.35S nanocomposite (Cd_0.65Zn_0.35S-TiO₂) was synthesized from titanate nanotubes for ion change of Cd²⁺ and Zn²⁺ followed by hydrothermal sulfuration treatment using thiourea as sulfur source. The Cd_0.65Zn_0.35S-TiO₂ with enhanced crystallinity of TiO₂ nanotube can be obtained by increasing hydrothermal temperature from 90 °C to 120 °C. And further increasing hydrothermal temperature to 150 °C, TiO₂ nanotubes collapse and transform into irregular shaped particles. The photocatalytic activity for hydrogen production of the prepared Cd_0.65Zn_0.35S-TiO₂ with different hydrothermal temperature was investigated under visible-light irradiation. The result shows that the Cd_0.65Zn_0.35S-TiO₂ with hydrothermal temperature of 120 °C presents the highest hydrogen evolution rate and photostability, which can be attributed to a rapid charge transfer at the interface between Cd_0.65Zn_0.35S and TiO₂ nanotube due to the increased crystallinity and unique 1-D nanotubular structure of TiO₂

[en] It is not allowed to install the temperature sensor through the opening pore in the pipe to measure the inner wall temperature for some pipe systems in nuclear power plants, and thus it is necessary to find an indirect and non-destructive method to obtain the inner wall temperature fluctuations. The inverse heat conduction problem is analyzed based on Green's function to achieve the inner wall temperature according to the out wall temperature of the pipeline. It is verified by examples and compared with the conjugate gradient method. Results show that the Green's function method can accurately catch the inner wall temperature fluctuation of the pipe and is applicable for the thicker wall pipe inverse heat conduction problem which is difficult to converge used by the conjugate gradient method. And because there is no need for iteration, the calculation efficient is much higher, which is more suitable for the fatigue monitoring calculation in nuclear power plants. (authors)

[en] The spent fuel pool of the CPR1000 type nuclear power plant (pressure water reactor) may loses it's cooling function in some conditions. The author uses Ling Dong NPP as the example to analysis the DESIGN-BASIS, system functions and defects of PTR, and gives some suggestions to improve the PTR with considering the requirements of technical specification. The results show that the spent fuel pool cooling problem is because that the designer does not consider the redundancy of the PTR completely. The author suggests to improve PTR cooling capacity and reduces the risk of losing cooling of spent fuel pool. (authors)