[en] Highlights: • SEM and TEM images present a uniformly distributed nanosize of 20–200 nm. • The results indicate that this material possesses high discharge capacity and quite good cycling stability. • The initial discharge specific capacity is 251.9 mAh g⁻¹ at 1 C (250 mA g⁻¹). • It delivers 107.5 mAh g⁻¹ for the first cycle and remains 82.7 mAh g⁻¹ after 500 cycles at 10 C. -- Abstract: High-capacity Li[Li_0.2Mn_0.54Ni_0.13Co_0.13]O₂ has been successfully synthesized as a cathode material for Li-ion battery by hydrothermal method. The prepared materials are characterized by XRD, SEM, TEM, EDS, XPS and electrochemical measurements. The XRD result shows that Li[Li_0.2Mn_0.54Ni_0.13Co_0.13]O₂ material formed a pure phase. SEM and TEM images present a uniformly distributed nanosize of 20–200 nm. The results of CV, charge–discharge tests indicate that this material possesses high discharge capacity and quite good cycling stability. It delivers 251.9 mAh g⁻¹ and 107.5 mAh g⁻¹ for the first cycle and remains 139.4 mAh g⁻¹ and 82.7 mAh g⁻¹ after 500 cycles, respectively, corresponding to 1 C and 10 C

[en] After a severe accident in nuclear reactor like Fukushima power plant for the on-site scenario, some staffs could not evacuate with personal vehicles especially in China. Faced the simulation requirement of evacuating by foot in microscopic field, here we will introduce the lattice-gas model of pedestrians evacuation with two dimensional grid dynamic analysis, combined with Gaussian puff model to calculate the scale of personal radiation risk for their trajectories discretely and respectively. The purpose of this paper is to give informatively route selection designed for the plan of nuclear emergency preparedness work in responding large amount leakage of radionuclide, and cope with the problems from evaluation of nuclear accident emergency management and regulation. Our results also illustrate comparison data and targeted countermeasure in the corresponding suggestion, and giving advice for individual and crowd. A simplified application is presenting in demonstrations in a nuclear power plant under constructed at south China. (author)

[en] Objective: To establish virtual three-dimensional instrument and cerebral aneurysm models by using three-dimensional moulding software, and to explore the effect of the models in interventional preoperative simulation. Methods: The virtual individual models including cerebral arteries and aneurysms were established by using the three-dimensional moulding software of 3D Studio MAX R3 based on standard virtual cerebral aneurysm models and individual DSA image. The virtual catheter, guide wire, stent and coil were also established. The study of interventional preoperative simulation was run in personal computer, and included 3 clinical cases. Results: The simulation results of the working angle and the moulding angle of the head of catheter and guide wire in 3 cases were identical with that of operation results. The simulation results of the requirement of number and size of coil in 1 case of anterior communicating aneurysm and 1 case of posterior communicating aneurysm were identical with that of operation results. The simulation results of coil for aneurysmal shape in 1 case of giant internal carotid artery aneurysm were more than 2 three-dimensional coils with size of 3 mm x 3 cm from the operation results, and the position of the second coil in aneurysmal neck was adjusted according to the results of real-time simulation. The results of retrospective simulation of operation procedure indicated that the simulation methods for regular and small aneurysms could become a routine simulation means but more simulation experience was needed to build up for the giant aneurysms. Conclusions: The virtual three-dimensional instrument and cerebral aneurysm models established by the general software provided a new study method for neuro-interventional preoperative simulation, and it played an important guidance role in developing neuro-interventional operation. (authors)

[en] Geological disposal is thought as the best ultimate disposal way of High-Level-Radioactive -Wastes (HLW) to separate them from biosphere permanently with a multiple-barrier system. The man-made barriers are composed of bentonite and canisters, which play an important role in avoiding HLW leaking. However, once bentonite is soaked by underground water, corrosion of may happen causing the leakage of HLW. Therefore, it's necessary to learn about the corrosion behavior of carbon steel simulated geological disposal conditions. Former studies focus more on the corrosion behavior of carbon steel in underground water without bentonite. The states of the carbon steel surfaces are determined by corrosion potential and the corrosion rates could be calculated by electrochemical impedance spectroscopy. This passage compared the corrosion behavior of carbon steel with bentonite and without bentonite using in-situ electrochemical measurements. Experiments showed that carbon steel would rather passivate when in simulated underground water with high concentrations of HCO₃^- and without bentonite while it is more prone to activate with low concentrations of HCO₃^-. But carbon steel would activate with bentonite and the concentrations of HCO₃^- had little influence on the corrosion modes. What's more, the in-situ EIS results showed that corrosion rates of carbon steel were smaller in bentonite/underground-water than in according underground-water. (authors)

[en] In the study of high temperature superconducting maglev, the analysis of the forces acted on a high temperature superconductor (HTS) bulk is a basic issue, which can directly reflect the levitation and guidance performances of an HTS maglev system. In previous studies, the electromagnetic guideway was verified to be an alternative guideway type for HTS maglev. Recently, we carried out experimental and simulation work to investigate how a field cooled HTS bulk to interact with a reversed magnetic field. An E-type electromagnet is used to generate the required magnetic field. During the field reversing, forces acted on the HTS bulk were measured with a 3D force measuring system. In this paper, the forces on an HTS bulk in a reversed magnetic field are analyzed according to the experimental data and the results of finite element simulation. The magnetized status of a field cooled HTS bulk in a reversed magnetic field is discussed with a two region supposition. The influences of a reversed magnetic field on HTS maglev are summarized. These results may be of great significance not only for further study of HTS maglev, but also for some other applications, such as superconducting magnetic bearing and superconducting magnetic shielding. (paper)

[en] Highlights: • Hierarchical mesoporous Cu_xCo_3_-_xO_4 nanosheets array was directly grown on conductive substrates. • Hierarchical mesoporous Cu_xCo_3_-_xO_4 nanosheets array was synthesized by a facile hydrothermal method. • Cu_xCo_3_-_xO_4 nanosheets exhibit very high initial discharge capacity. • Cu_xCo_3_-_xO_4 nanosheets have good rate performance. - Abstract: Hierarchical mesoporous Cu_xCo_3_-_xO_4 nanosheets have been directly grown on Ti foil by a facile hydrothermal method and a subsequent annealing treatment. The rich porosity of the sample heated at 600 °C (CCO-600) shows excellent electrochemical performance when as anode for Li-ion batteries. It exhibits very high initial discharge capacity of 1300 mAh g"−"1 at 300 mA g"−"1 (1C=1100 mA g"−"1) and achieves reversible charge capacity as high as 335 mAh g"−"1 at the current density of 50 C. More importantly, when altering the current density back to 0.1 C, the charge capacity could be recovered to 1045 mAh g"−"1.Such high rate capability indicates that this hierarchical mesoporous Cu_xCo_3_-_xO_4 nanosheets material has great potential in lithium ion batteries

[en] In this study, the differences in terms of repeatability, stability, and precision between the N-type HPGe detector and Well-type HPGe detector with the sample in the well and on the well were analyzed, using the GMX50P4 coaxial germanium N-type and GWL-120-15 well-type HPGe detector by ORTEC company in USA as well as the standard sources from China Institute of Atomic Energy. The results demonstrated that the measurement time to reach the same counts of full energy peak for samples in the well by well-type HPGe detector is as 6 times as that by N-type detector, while the time by well-type detector for samples in the well is as 2.5 times as that for samples on the well. The standard deviation of repeatability for the following three cases, the N-type HPGe detector, well-type HPGe detector with the sample in the well, and well-type detector with the sample on the well, were 0.07, 0.22, and 0.08 Bq/kg respectively; the annual stability of the detection efficiency for the three cases was 2.74%, 2.36%, and 3.07% respectively; the relative bias of the precision for the three cases was 3.47%, 6.57%, and 3.43% respectively. In order to meet the demand of precision and measurement time, it is advised to use N-type HPGe detector or Well-type HPGe detector with the sample on the well in case of enough sample mass. (authors)

[en] Traditional control system with fixed gains may encounter problems such as large overshoot and large settling time. Large overshoot of the control rod position shortens the lifetime of control rod. Thus, improvements on traditional control system performance to decrease overshoot is necessary. A small pressurized water reactor model with a thermal power of 150MW is established by RELAP5. The model includes reactor core, pressurizer, two U-tube steam generators (SG) and main coolant pumps. Based on PID method, the reactor power control system, pressurizer pressure and level control system, and feedwater flow control system are designed. The parameters of the control system are tuned. The performance of control systems are tested by introducing step and ramp changes in load. The overshoot and settling time are evaluated. Due to large overshoot of control rod, fuzzy controller is adopted to improve performance of control systems. Through the introduction of typical load patterns, the performance of the optimized control system is compared with the traditional control system. Overshoot and settling time of the control rod position are decreased. Performance has been significantly improved by introducing fuzzy control. (author)

[en] The SU(3) quadrupole-quadrupole interaction is replaced by the SO(6) cubic [Q₍₀₎ × Q₍₀₎ × Q₍₀₎]⁰ interaction in fitting energy levels, some energy ratios and B(E2) ratios. It is shown that the alternative scheme can indeed be used to describe properties of the X (5) nuclei, for example, ¹⁵⁰Nd, ¹⁵²Sm, ¹⁵⁴Gd. The results of the new scheme are compared with the corresponding experimental data and with those of the traditional U(5) — SU(3) transitional description. It is clearly shown that the results are better than those obtained from the traditional U(5) — SU(3) transitional description. (nuclear physics)

[en] A localized plasmon resonance sensor consisting of an asymmetric split-ring resonator array sustaining highly localized field energy with high refractive index sensitivity and good figure of merit is demonstrated and investigated. In the proposed 3-cut split-ring resonator structure with broken symmetry, a highly tunable transmission with a large modulation depth and a narrow resonance linewidth is obtained, which shows polarization-insensitive and angle-independent properties. Numerical calculation results show that a high sensitivity of up to 1006 nm/RIU and a figure of merit of 9.7 can be reached. This plasmonic index sensor is practically obtainable, and is expected to have potential applications for high-sensitivity convenient and efficient detection. (paper)