[en] Because the system is deformed in the exactly solvable mean-field plus nearest-orbit pairing model, so we introduce a projection method for this model, which can help us project the Hamiltonian into a subspace with good angular momentum and construct the basis states with definite angular momentum. This procedure makes it possible to describe more low-lying spectra. (authors)

[en] Nonlinear finite element analysis of nuclear power plant prestressed concrete containment structure subjected to internal pressure is carried out. SOLID65 element and constitutive model of concrete in ANSYS are introduced in detail, and solution control methods are put forward. In numerical simulation, the radial displacement between 15 m and 30 m model height is larger than that at other level, and the radial displacement at about 25 m height is the maximum. Because of prestressing, the model structure is under compression till internal pressure is up to 0.42 MPa, and it satisfies the design requirement. Analysis of the model structure shows that the containment is safe under the given inner pressure, which can contribute to the integrity test of concrete containment structure. (authors)

[en] 1-methyl-3-(5-nitropyridin-2-yl) urea (8) is an important intermediate for small molecule anticancer drugs. A rapid and high yield synthetic method for 1-methyl-3-(5-nitropyridin-2-yl) urea (8) was established in this work. The target compound was synthesized from the commercially available 2-chloro-5 -nitropyridine (5) through multi-step nucleophilic reactions.The structure of the target product was confirmed by ¹H NMR. In addition, the synthetic method was optimized. The total yield of the four steps was high up to 92%. (paper)

[en] According to a large-span half-steel-concrete (HSC) composited beam in the composited roof in the HTR-PM, a 1:3 scale specimen is investigated by the static load test. By analyzing the loading, deflection, strain and fracture development of the specimen in the process, studying the mechanical characteristics and failure pattern of such components. The ANSYS finite element software is utilized in this paper to analyze the nonlinearity behavior of the HSC beam specimen, and through comparing the experimental results and the numerical simulation, it can be illustrated that the finite element model can simulate the HSC beam accurately. From the test results, it can be concluded that by means of appropriate shear connection and anchorage length, steel plate and concrete can work together very well and the HSC beam has good load carrying capacity and ductility. These conclusions can serve as a preliminary design reference for the large span half-steel-concrete composite beam in NPP. (author)

[en] Prestressing technology is widely used in nuclear power plant containment building, and the durability of containment structure is affected directly by the distribution and loss of prestressing value under design-basis pressure. Containment structure and the distribution of prestressing system are introduced briefly. Furthermore, the calculating process of horizontal prestressing bunch loss near the equipment hatch hole is put forward in details, and the containment structure prestressing loss when 5-year pressure test is obtained. Based above analysis, the finite element model of the prestressed concrete containment structure is built by using ANSYS code, the prestressing effect on concrete containment is analysed. The results show that most of the design pressure is bore by the prestressing system under the design-basis pressure, so the containment structure is safe. These conclusions are consistent with prestressing containment system design concepts, which can provide reference to the engineering staff. (authors)

[en] After loss of coolant accident (LOCA) occurs in nuclear power plant, the temperature field distribution in prestressed concrete containment (PCC) is nonlinear significantly. However, the detailed calculation method combining temperature and pressure is not proposed in current PCC design code in China. In this paper, the finite element model for PCC including prestressed tendons was built by using ANSYS code and the temperature field under LOCA was calculated. The calculation results were compared with the theoretical results, and the accuracy of the proposed model was verified. The response law of PCC under high pressure and high temperature was preliminarily analysed, and the effects of temperature and prestressed tendons on PCC were concluded, which can provide reference to the concrete containment design. (authors)

[en] Aiming at a large span half-steel-concrete (HSC) composite beam in the composited roof in High Temperature Reactor Pebble-bed Module (HTR-PM) Demonstration Project, a specimen with scaled-down size was investigated by the static load test. The deflection, strain and fracture development of the specimen in the loading process were analyzed and the mechanical characteristics and failure pattern of such components were studied. The finite element model of the HSC composite beam specimen was established and analyzed. The results show that under the ultimate load, the maximum deflection at the middle of the specimen beam obtained from the simulation results are basically consistent with the test results, and the tiny cracks first appear on the concrete surface of the lower part of the side web of the beam. The steel plate and concrete in such type of structure can effectively form as composite cross-section working together and the HSC composite beam has good load carrying capacity and ductility. These conclusions can serve as a preliminary design reference for the large span HSC composite beam in NPP. (authors)

[en] Qinshan Nuclear Power Phase I sea wall project is a barrier engineering in defending the design basis flooding, which is of importance to the safety of NPP. The geological condition has the feature of high compressibility and low penetration, such as the soft ground of 1 + 450 section of Qinshan Nuclear Power Phase I sea wall. Based on parameters acquired from the site experiment, 3-D finite difference analysis is put forward to study the feature of consolidation settlement laws, which can embody the fluid-solid coupling interaction. The conclusions of numerical analysis agree well with the in-site measured data, and it, can contribute to the design and construction of raising sea wall project. (authors)

[en] Recent experimental results on generating of excited states in collisions of single, double charged ions with He, Ne, Ar are presented. Laboratory energy range of the beams of He^q+, Ar^q+ (q = 1, 2) ions are (70-170) x qkeV. The optical measurement was performed by Optical Multichannel Analysis System, the wavelength range covered was 200-800 nm. Different processes of excitation have been observed in single and double charged ions collisions with atoms. The dependence of emission cross sections on the charge number of incident ions and potential energy defect is discussed

[en] Recent experimental results on charge transfer into excited states in collisions between singly and doubly charged ions with He, Ne, Ar, H₂ and O₂ are presented, respectively. The energy range of the ion beams of He^q+, Ar^q+, Ne⁺ (q = 1,2) ions is (70-170) x q keV. The optical measurement was performed by an Optical Multichannel Analysis System (OMA). The wavelength range covered was 200-800 nm. Different processes of excitation have been observed in single and double charged ion collisions with neutrals. The dependence of emission cross sections on the potential energy defect is discussed. (author)