[en] The diffusion reaction kinetics of weathered crust elution-deposited rare earth with mixed ammonium salts was studied. The influence of concentration of reagents and particle size of ore on diffusion rate was investigated. The results showed that the diffusion process and diffusion rate could be improved by increasing reagents concentration and decreasing diffusion flowing rate and particle size. The diffusion process could be explained with the shrinking core Model, which could be controlled by the diffusion rate of reacting reagents in porous solid layer.

[en] In order to analyze the dynamic response of the reactor structure, a three-dimensional nonlinear was established. The model overcame many nonlinear factors such as clearance, contact, friction, damping, pretension, impact, fluid-structure coupling and connection stiffness. Considering the fluid-structure coupling between the core barrel and the RPV, the hydrodynamic mass matrix was modeled and verified by ANSYS acoustic element. Three-dimensional upper core plate, lower core support plate was set up. Multi-group fuel assembly was built, which considered the preload and bounce with the core plate, the clearance and impact with the core shroud. The model accurately simulated the dynamic response of the reactor structure because of the coupling of horizontal and vertical directions. Finally, the response of each component was obtained by inputting the time history of the impact acceleration in three directions, which provided the input for the stress analysis of the components and the impact experiment of the control rod drive line. The method in this paper can offer a reference for the three-dimensional nonlinear dynamic analysis of the reactor structure. (authors)

[en] A novel fault diagnosis method based on improved multiscale range entropy and hierarchical prototype (HP) is proposed in this paper. Firstly, considering that range entropy cannot analyze the complexity of time series from multiple perspectives, the coarse-grained process is combined with range entropy. In addition, to make the coarse-grained process more comprehensive, the selection of its starting point is improved. Secondly, to extract more feature information, the dimension reduction of eigenvectors is carried out by using singular value decomposition. Finally, HP is trained with the eigenvectors and its performance is tested. To test the performance of the proposed fault diagnosis method, testing bearing vibration signals collected by sensors from Case Western Reserve University and Southeast University are used for experimental analysis in this paper, and the experimental results show high accuracy of the proposed fault diagnosis method. To verify the suitability of the improvement proposal, the superiority in feature extraction ability and the classification capability of the classifier, the proposed fault diagnosis method is compared with another seven fault diagnosis methods. The results show that the proposed fault diagnosis method has the highest fault diagnosis accuracy. (paper)

[en] This paper introduces the background of safety standardization of military industry system, and analyzes the problems existing in the construction of safety standardization of abandoned mines of uranium mining and metallurgy, such as the lag of standards and the weakness of management. Combined with the production and personnel characteristics of the abandoned mine, this paper puts forward measures in four aspects:standard construction, evaluation method, operation management and safety culture. And some suggestions are given for management and executive departments of safety standardization at different levels. (authors)

[en] This paper presents an elastic metamaterial shaft with a new class of stack-like resonators consisting of bonded periodically annular rubber and lead rings that support the formation of ultra-low-frequency vibration band gaps because of reduced stiffness resulting from the discretized rubber rings. By using finite element method, the band structures and the transmission power spectra of the proposed metamaterial shaft are investigated. Subsequently, the mechanism of the band gaps is illustrated by analyzing the displacement fields of extracted mode shapes at the edge of band gaps. Lastly, finite element method is used to explore the effects of geometrical parameters on the band gaps. The related results confirm the very-low-frequency vibration mitigation performance of the proposed meta-shaft below 120 Hz and indicate there is a complete bandgap in which flexural, longitudinal and torsional vibration can be simultaneously attenuated. Moreover, multiple flexural band gaps are observed in the concerned region of frequencies in our design, and the mechanism behind this characteristic is analyzed by eigenmodes. The new structure presented here can thus be used to reduce vibrations of shaft-like structures at low frequencies in the practical environment. (paper)

[en] Highlights: • A method for assessing Human Error Probability based on HIFs tests was developed. • The evaluation of Common Performance Commons was optimized. • Applications of the method in an enterprise to demonstrate its reasonability. Current Human Reliability Analysis (HRA) methods have focused on the impact of environmental conditions or Performance Shaping Factors (PSFs) on human errors, while current research has ignored two aspects: one the influence of Human Inherent Factors (HIFs) associated with accidents, the other the Human Error Probability (HEP) calculations, whose results were not based on HIFs tests. The purpose of this study was to examine HEP based on HIFs’ assessments that contained physiological and psychological factor tests, including Cognitive Reliability and Error Analysis Method (CREAM) was chosen as a framework. Additionally, the evaluation of Common Performance Commons (CPCs) was optimized so that assessment of CPCs in objective circumstances could be achieved. This method was applied within a pharmaceutical company to demonstrate its applicability and reliability in order for it to be more widely applied in HEP calculations in other various industries to appraise tasks in relation to status management, and staff personnel management.

[en] We investigate the entanglement dynamics of a system that consists of four single-mode cavities that are spatially separated and connected by two optical fibers, with multiple two-level atoms trapped in each cavity. It is shown that the phenomenon of entanglement sudden death and sudden birth appears in this system and is sensitive to the initial conditions and the parameter r. In addition, we also study the entanglement and entangled state transfer between the atoms and find that a perfect transfer can be realized if the value of the parameter r satisfies a certain condition, established here. (author)

[en] A copper chemical mechanical polishing (Cu CMP) process is reviewed and analyzed from the view of chemical physics. Three steps Cu CMP process modeling is set up based on the actual process of manufacturing and pattern-density-step-height (PDSH) modeling from MIT. To catch the pattern dependency, a 65 nm testing chip is designed and processed in the foundry. Following the model parameter extraction procedure, the model parameters are extracted and verified by testing data from the 65 nm testing chip. A comparison of results between the model predictions and test data show that the former has the same trend as the latter and the largest deviation is less than 5 nm. Third party testing data gives further evidence to support the great performance of model parameter optimization. Since precise CMP process modeling is used for the design of manufacturability (DFM) checks, critical hotspots are displayed and eliminated, which will assure good yield and production capacity of IC. (semiconductor technology)

[en] Topological sonic crystals are artificial periodic structures that support robust edge or interface state. Most previous studies on interface state in one-dimensional system heavily rely on Su-Schrieffer-Heeger (SSH) model, which modulates inter and intra hopping strength to yield a nontrivial topological phase. Whether it is possible to achieve interface states by connecting two trivial phases remains a question. To this point, in this paper, we propose a novel method of breaking the inversion symmetry of diatomic and elaborate the underlying mechanism using a spring-mass model. Instead of modulating spring stiffness corresponding to hopping strength which is intrinsically requested in the SSH model, we perturb the masses to break inversion symmetry while springs remain unchanged. Although breaking inversion symmetry in diatomic does not lead to a nontrivial phase, it is found that the interface state would still emerge within the chain formed by connecting two different configurations. Subsequently, this mechanism is applied to a one-dimensional acoustic resonator system connecting two different configurations to realize interface state. Simulation results reveal that acoustic wave has strongly localized at predicted interface frequency. Our study provides a novel approach of producing interface states in the one-dimensional acoustic system. (paper)

[en] In this paper, the N-particle GHZ states are used as quantum resources for multiparty quantum secure direct communication. Three new multiparty quantum secure direct communication protocols are proposed, which are based on the ideal quantum channels, the collective–dephasing noise channels and the collective–rotation noise channels, respectively. With the help of logical quantum states, the latter two protocols can be immune to the collective–dephasing noise and the collective–rotation noise, respectively. The security analysis shows that the Trojan horse attacks and the teleportation attack are automatically resisted because of the one-way transmission of quantum states in quantum channels. The use of the decoy states (or decoy logical qubits) also makes the three protocols secure against other kinds of attacks. Moreover, all of them have no information leakage problem.