[en] A numerical method for the solution of the Cohen's radially averaged concentration equation is presented in the case of multi-isotope separation. The applicability of the method is verified through two cases of separation, Xe and Cr0₂ F₂, and the results show that the convergence is fast and little time is consumed. The separation results demonstrate that in the case of large separation factors, the overall separation factors γ₀ of unit mass difference are not equal, which are calculated by using the separation between different components. This means that the relationship γ_ij = γ₀^M_J-M_i no longer holds. However, for most centrifuges, γ₀ < 1.5, this relationship can still be employed. (authors)

[en] Based on tight-binding model and first-principles calculations, we systematically investigate the geometric, electronic, and magnetic properties of hydrogenated stanene. The results indicate that the half-hydrogenation breaks the π-bondings of stanene, leaving π electrons in unsaturated Sn atoms localized and unpaired, which makes it transform into half-metal (HM) with room-temperature ferromagnetism. Especially, the magnetism of hydrogenated stanene can be effectively tuned by different rates of coverage for hydrogen atoms. While for the case of full-hydrogenated stanene, two different configurations exhibit the nature of semiconductor and semimetal, respectively, which is dependent on the arrangement of hydrogen atoms. We also find that the band gaps of stanane bilayer and monolayer can be effectively modulated by external electric field and strain. These findings demonstrate that hydrogenation is an efficient way to tune the electronic properties of stanene, and it provides a new perspective for the potential application in nanoelectronics. - Highlights: • Room temperature ferromagnetism in half hydrogenated stanene. • The effects of the ratio of hydrogenation and electric field. • Tunable band gaps of stanane by external factor.

[en] We perform first-principles calculations to study the energetics and electronic properties of silicene and MoSe_2 heterobilayers (Si@MoSe_2 HBLs). It is found that the silicene is bound to MoSe_2 substrate with a binding energy of −0.56 eV per silicon atom, indicating a weak interaction between two layers. The nearly linear band dispersion character of silicene with a sizable band gap is obtained in Si@MoSe_2, due to the variation of on-site energy induced by MoSe_2 substrate. Remarkably, the band gaps and electron effective mass (EEM) of HBLs can effectively be tuned by interlayer spacing, external electric field, and strains. These findings indicate that Si@MoSe_2 HBLs are promising candidates for high-performance silicene-based FET channel operating at room temperature, in which both finite band gap and high carrier mobility are obtained. - Highlights: • The nearly linear band dispersion of silicene is remained. • The band gaps can be modulated by spacing distance, strain and electric field. • The electron effective mass also demonstrates an ideal adjustable range. • The high carrier mobility can also be preserved

[en] The computational efficiency and reliability of the exponential transition homotopic algorithm depends on the value of a parameter in the solution of the nonlinear cascade equations, which reduces its applicability and makes it unsuitable for optimization analysis of cascades. The efficiency and reliability are greatly improved by using a homotopic algorithm of variable step length, which traces the homotopic curve through a predictor-corrector method. Computations of cascades with different separation factors have shown that the improved algorithm is very efficient and reliable, and is the method of choice in cascade computation. (authors)

[en] Graphical abstract: Synopsis: Self-assembled hierarchical Mn₂O₃ microspheres is synthesized as anode material for lithium ion battery through rapid microwave hydrothermal processes within 30 minutes. All the raw materials and products are under the principle of environmental protection. - Highlights: • Hierarchical Mn₂O₃ microsphere is obtained by rapid microwave hydrothermal synthesis. • Large specific surface area with mesoporous is characterized. • High specific capacity of 921.6 mAh g⁻¹ is reached at 200 mA g⁻¹. • Continual enhancement of interface Li-storage brings an abnormal high capacity. • High capacity of 525 mAh g⁻¹ is obtained at 1000 mA g⁻¹ after 500 cycles. - Abstract: Rapid microwave hydrothermal synthesis is carried out to obtain hierarchical Mn₂O₃ microsphere through a self-assembled process within 30 minutes. All the raw materials used is nontoxicity without any template or polymer and the side-products are all small molecules which abide by the pricnciple of environmental protection. After the following solid state reaction, the as-prepared Mn₂O₃ powders can still keep the hierarchical morphology of micro sphere which is consisted of small primary particles and secondary slices. The sample obtained at 600 °C with high crystallinity, large specific surface area and mesoporous exhibits best electrochemical performances. High specific capacity of 921.6 mAh g⁻¹ could be reached at a current density of 200 mA g⁻¹. An interesting phenomenon with abnormal capacity increasing appears which could be ascribed to the continual enhancement of interface Li-storage. Thus, high specific capacity of about 525 mAh g⁻¹ is obtained at high current density of 1000 mA g⁻¹ after 500 cycles. Furthermore, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) are performed to further study the hierarchical Mn₂O₃ anode material. It is revealed that such rapid microwave synthesis without any contamination is considered as a promising way to obtain hierarchical manganese oxides as anode material for applications.

[en] When functionally graded material layers are inserted between two impedance mismatching media, passbands with extremely large bandwidths can appear in these layered systems. An accurate and effective iterative method is developed to deal with these layered systems with extremely large layer number.

[en] The electronic structures and transport properties in monolayer blue phosphorene nanoribbons (BPNRs) with transverse electric field have been studied by using density functional theory and nonequilibrium Green's functions method. The results show that the band gaps of BPNRs with both armchair and zigzag edges are linearly decreased with the increasing of the strength of transverse electric field. A semiconductor-metal transition occurs when the electric field strength reaches to 5 V/nm. The Stark coefficient presents a linear dependency on BPNRs widths, and the slopes of both zBPNRs and aBPNRs are 0.41 and 0.54, respectively, which shows a giant Stark effect occurs. Our studies show that the semiconductor-metal transition originates from the giant Stark effect. - Highlights: • The electronic transport in blue phosphorene nanoribbons. • Semiconductor-metal transition can be observed. • The semiconductor-metal transition originates from the giant Stark effect.

[en] Ling'ao Nuclear Power Station data acquisition system is responsible for the analog and digital data acquisition for the whole plant equipment. There has been sporadic offline fault of data acquisition board and a fault condition PLC acquisition can not be automatically reset. Because the system's PLC program and PC with an integrated design, modifying PLC program alone is impossible. Through the use of an external PLC device MSG instruction and the MSG instruction reset remotely by means of a process to achieve the offline PLC Fault , solved the problem that original system LEVEL1 layer PLC program can not be modified. (authors)

[en] SSC-LINAC control system is based on EPICS architecture. The sub control system of digital power supplies is a kind of IOC send and receive custom command via Ethernet and TCP/IP protocol. The old IOC is designed to use period scan mode IOC, and there are so many digital power supplies, that we can't make sure every connect condition of digital power supply is fine. IOC must wait a long time if one of them can't connect correctly and other digital power supply's PV may also be blocked. An IOC that uses interrupt driven mode to avoid the shortcoming was designed. This will be described in this paper. (author)

[en] With the accumulation of experience in the operation and maintenance of nuclear power plants and the increasing competitive pressure in the power market, operators pay more and more attention to the reasonable arrangement of preventive maintenance activities and regular tests during the power operation and refueling overhaul. The nuclear safety regulatory body have always attached great importance to the risk assessment and management of crew maintenance activities, and issued relevant technical policies to make corresponding provisions. International practice shows that probabilistic safety analysis is a powerful tool for nuclear power plant maintenance risk assessment and management. In this paper, the maintenance configuration of specific system equipment of domestic M310 unit in power operation mode is selected as the research object, and the risk assessment is studied and analyzed, and the risk management measures are proposed. The analysis method in this study can be used for reference by nuclear power operators and nuclear safety regulatory authorities. (authors)