[en] This paper analyses the present characteristics of installation and design for the primary loop of PWR NPP, and correspondingly puts forward the improved options. By contrasting the present and improved techniques, it discusses the advantages of installation and design improvement for the primary loop of reactor coolant system. We hope that the paper contribute to raising the level of installation and quality control for the primary loop of PWR NPP. (authors)

[en] Highlights: • MnO₂/MWCNTs composites anode exhibits faster reaction kinetics. • The surfaces of MnO₂/MWCNTs composites anode exhibits better wettability. • A BMFC using the modified anode have excellent power output. - Abstract: Improving anode performance is of great significance to scale up benthic microbial fuel cells (BMFCs) for its marine application to drive oceanography instruments. In this study, manganese oxide (MnO₂)/multiwall carbon nanotubes (MWCNTs) composites are prepared to be as novel anodes in the BMFCs via a direct redox reaction between permanganate ions (MnO₄⁻) and MWCNTs. The results indicate that the MnO₂/MWCNTs anode has a better wettability, greater kinetic activity and higher power density than that of the plain graphite (PG) anode. It is noted that the MnO₂ (50% weight percent)/MWCNTs anode shows the highest electrochemical performance among them and will be a promising material for improving bioelectricity production of the BMFCs. Finally, a synergistic mechanism of electron transfer shuttle of Mn ions and their redox reactions in the interface between modified anode and bacteria biofilm are proposed to explain its excellent electrochemical performance

[en] Highlights: • Design proper numerical flux for thermally perfect gas. • Line-implicit LUSGS enhances efficiency without extra memory consumption. • Develop unified framework for both second-order MUSCL and fifth-order WENO. • The designed gas model can be applied to much wider temperature range. - Abstract: Effective high-order solver based on the model of thermally perfect gas has been developed for hypersonic heat transfer computation. The technique of polynomial curve fit coupling to thermodynamics equation is suggested to establish the current model and particular attention has been paid to the design of proper numerical flux for thermally perfect gas. We present procedures that unify five-order WENO (Weighted Essentially Non-Oscillatory) scheme in the existing second-order finite volume framework and a line-implicit method that improves the computational efficiency without increasing memory consumption. A variety of hypersonic viscous flows are performed to examine the capability of the resulted high order thermally perfect gas solver. Numerical results demonstrate its superior performance compared to low-order calorically perfect gas method and indicate its potential application to hypersonic heating predictions for real-life problem.

[en] A typical three-loop pressurized water reactor (PWR) as reference planted is chose, and the PWR severe accident analysis models based on RELAP5/SCDAP/MOD3.2 code are developed. The best estimate calculation of hot leg large break LOCA of 18 cm without mitigating measures is performed. The mitigating capability of injection to the accident is studied when peak core surface temperature reaches 1100 K 1300 K and 1500 K respectively. The results show that the injection occasion plays an important role in the accident progression. Injection during early stage will prevent core from melting effectively. However, injection during later stage may deteriorate the progression of severe accident and accelerate of core melt. (authors)

[en] The effects of self-generated magnetic field on the density profile modification in laser plasma interactions are studied by calculating the field structure, assuming that plane electromagnetic waves propagate into an one-dimensional inhomogeneous magnetized plasma. The results obtained by computation are in agreement not only with the laser-target experiments using Nd-glass laser, but also with that using CO₂ laser. In addition, calculations show naturally the density dip which has been observed in experiments

[en] This paper introduces a 32 channel high-speed data acquisition system based on Ethernet transmission. The system is mainly used for nuclear fuel rods quality testing; it can collect data from the nuclear fuel detection sensor and analyze them. This system includes data receiving module, control module and network communication module as well as the software for data analyzing and controlling. This system uses FPGA for data reception and counting. At the same time it uses the ARM as the main control chip to control the operation of coordination between various modules. The ARM chip packages the data which has received from the FPGA, then sends them to the network communication module. After that, the data transfer to the PC via Ethernet. Finally the PC program, which is based on socket programming, receives and handles the data. After performing for a long time, the tests have proved that system is stable and it can meet the requirements of industrial detection. (authors)

[en] A series of Mg_xNi_1-xO alloy films were prepared by pulsed laser deposition. In the procedure, the laser energy density was fixed at 5 J/cm² , while the temperature of heated substrate varied from 300℃ to 700℃. The composition and microstructure of the as deposited films were characterized by atomic force microscopy (AFM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The influence of annealing on the sample was also studied. UV-VIS spectrophotometer was used to analyse the transmittance of the films. Some interesting results were obtained. The as deposited Mg_xNi_1-xO film was found constituted by crystalline component and amorphous one. The ultraviolet absorption edge were located at about 290 nm, near the superior limit of solar-blind wavelength. It is also found that the film prepared at 5 J/cm²-500℃ have strong absorption within short wave range, but scarce absorption in infrared and visible wave band, which is useful to ultraviolet detection. The annealing treatment was very effective to improve the surface quality of the film, but had little effect on the optical band gap. (authors)

[en] High pressure air pipeline joint is important part of high pressure air system, whose reliability is related to the safety and stability of the system. This thesis developed a new type-high pressure air pipeline joint, carried out dynamics research on CB316-1995 and new type-high pressure air pipeline joint with finite element method, deeply analysed the join forms of different design schemes and effect of materials on stress, tightening torque and fatigue life of joint. Research team set up vibration/pulse test bench, carried out joint fatigue life contrast test. The result shows: the maximum stress of the joint is inverted in the inner side of the outer sleeve nut, which is consistent with the failure mode of the crack on the outer sleeve nut in practice. Simulation and experiment of fatigue life and tightening torque of new type-high pressure air pipeline joint are better than CB316-1995 joint. (paper)

[en] Objective: To assess the technique and clinical outcome of subintimal recanolization (SIR) for peripheral artery total occlusion. Methods: Eighteen patients with 20 arterial occlusions underwent SIR. The occlusive lesions were located in the iliac-femoral artery (14 lesions), the infrapopliteal arteries (4 lesions) and the left subclavian artery (2 lesions), respectively. Basic procedure of SIR was to create a subintimal path in the wall of the occluded artery and reentry the true lumen by using 0.035 inch diameter TERUMO guidwire and angiographic catheter. Subsequently, balloon angioplasty was performed in all recanalized lesions, and stent was placed in initial parts or whole recanalized path except one lesion in the iliac-femoral artery, and the lesions in the infrapopliteal arteries. Results: Seventeen occlusive lesions in 15 patients were successfully recanalized by means of SIR, and the corresponding symptoms were disappeared or improved obviously. Technical failure occurred in 3 patients due to inability to reenter the distal true lumen or balloon angioplasty was not satisfactory. No complications of artery rupture, thrombosis or embolization were found. Conclusion: SIR is an effective and safe therapy for peripheral artery total occlusion. This technique provides a feasible alternative to conventional percutaneous transluminal angioplasty especially in the complicated cases. (authors)

[en] Fabricating new functional materials has always been at the center of colloidal science, and how to form circular rings is a meaningful challenge due to their special electronic, magnetic and optical properties. Magnetic colloidal spheres can self-assemble into rings, but these rings have an uncontrollable length and shape and also have to coexist with chains and defected clusters. To make the most of magnetic spheres being able to self-assemble into rings, a patch is added to the surface of the sphere to form a chiral link between particles. The structural transition in the system of patchy magnetic spheres is studied using the Monte Carlo simulation. When the patch angle is in the interval ${60}^{{}^{\circ <!--\; ???\; -->}}$ to ${75}^{{}^{\circ <!--\; ???\; -->}}$, rings become the dominant structure if the strength of patchy interaction exceeds a particular threshold and the shape of these rings is close to the circle. With an increase in the patch angle, the threshold of patchy interaction decreases and the average length of the circular ring increases approximately from 5 to 8.5. (paper)