[en] This paper mainly describes a part of structure size and related matter compositions of core, fuel elements, and control rods etc. in zero power experimental assembly of nuclear power plant simulation core

[en] Graphical abstract: A homogeneous nanocomposite of SnSe and carbon black was synthesised by high energy ball milling and empolyed as an anode material for sodium-ion batteries (SIBs) and lithium-ion batteries (LIBs). The nanocomposite anode exhibits excellent electrochemical performances in both SIBs and LIBs. - Highlights: • A homogeneous nanocomposite of SnSe and carbon black was fabricated by high energy ball milling. • SnSe and carbon black are homogeneously mixed at the nanoscale level. • The SnSe/C anode exhibits excellent electrochemical performances in both SIBs and LIBs. - Abstract: A homogeneous nanocomposite of SnSe and carbon black, denoted as SnSe/C nanocomposite, was fabricated by high energy ball milling and empolyed as a high performance anode material for both sodium-ion batteries and lithium-ion batteries. The X-ray diffraction patterns, scanning electron microscopy and transmission electron microscopy observations confirmed that SnSe in SnSe/C nanocomposite was homogeneously distributed within carbon black. The nanocomposite anode exhibited enhanced electrochemical performances including a high capacity, long cycling behavior and good rate performance in both sodium-ion batteries (SIBs) and lithium-ion batteries (LIBs). In SIBs, an initial capacitiy of 748.5 mAh g"−"1 was obtained and was maintained well on cycling (324.9 mAh g"−"1 at a high current density of 500 mA g"−"1 in the 200 th cycle) with 72.5% retention of second cycle capacity (447.7 mAh g"−"1). In LIBs, high initial capacities of approximately 1097.6 mAh g"−"1 was obtained, and this reduced to 633.1 mAh g"−"1 after 100 cycles at 500 mA g"−"1

[en] Highlights: • Hollow carbonized polyaniline spheres was prepared by a simple copper(II)-catalyzed self-assembly method. • Hollow carbonized polyaniline spheres can effectively constrain the selenium and polyselenides. • The hollow carbonized polyaniline spheres/selenium composite cathode exhibits excellent electrochemical properties. - Abstract: A hollow carbonized polyaniline spheres/selenium (HCPS/Se) composite was prepared by a simple combination method of a self-assembly method, pyrolysis and vapor phase infusion process as a cathode material for Li–Se rechargeable batteries. The composites were characterized and examined by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, the X-ray photoelectron spectroscopy and electrochemical methods, such as cyclic voltammetry, electrochemical impedance spectroscopy and galvanostatic charge/discharge tests. The HCPS/Se composite cathode can deliver relative high capacity, high Coulombic efficiency and good cycling performance. The electrochemical results show that the HCPS/Se composite cathode exhibits an initial discharge specific capacity of 571.5 mA h g"−"1 and retains 298.7 mA h g"−"1 with high Coulombic efficiency after 100 cycles at a high rate of 0.5 C (337.5 mA h g"−"1), which are higher than that of the pristine selenium cathode. The excellent electrochemical properties benefit from the high conductivity and the hollow structures of the carbonized polyaniline spheres

[en] 2∼3.5 mol%Y₂O₃ stabilized zirconia powders were prepared by mixing pure zirconia and Y(NO₃)₃ solution. The sintering ability of these powders was investigated. The results show that with the increasing amount of yttria, the grain size decreases while the density and the (t+c)-ZrO₂ phase fraction increase. It is not sufficient in stabilizing all the zirconia when the doped yttria is less than 2.5 mol%. Several experimental rules about the microstructure and phase content developing with sintering temperature and soaking time are presented. The critical grain size for the retention of high-temperature tetragonal phase in 3Y-TZP is about 0.5 μm. A 3Y-TZP sample with grain size about 0.3 μm, relative density higher than 99%, (t+c)-ZrO₂ phase fraction more than 90%, was obtained when it was sintered at 1450 deg. C for 2 h in air

[en] In many applications, the shape of a droplet may be assumed to be an oblate spheroid. A theoretical study is conducted on the evaporation of an oblate spheroidal droplet under forced convection conditions. Closed-form analytical expressions of the mass evaporation rate for an oblate spheroid are derived, in the regime of controlled mass-transfer and heat-transfer, respectively. The variation of droplet size during the evaporation process is presented in the regime of shrinking dynamic model. Comparing with the droplets having the same surface area, an increase in the aspect ratio enhances the mass evaporation rate and prolongs the burnout time. - Highlights: • Fully algebraic solutions for the spheroidal droplet evaporation rate is obtained. • We examine the effect of aspect ratio on the droplet evaporation. • We propose a calculation method of Nusselt number for spheroidal droplet

[en] Multiple substitution compounds with the formula LiNi_0.8-yTi_yCo_0.2O₂ (0≤y≤0.1) were synthesized by sol-gel method using citric acid as a chelating agent. The effects of titanium substitution on the structural, electrochemical and thermal properties of the cathode materials are investigated. A solid solution phase (R-3m) is observed in the range of 0≤y≤0.1 for the titanium-doped materials. X-ray photoelectron spectroscopy (XPS) shows that there are Ni³⁺, Ni²⁺, Co³⁺, Co²⁺ and Ti⁴⁺ five transition metal ions in titanium-doped materials. Rietveld refinement of X-ray diffraction (XRD) patterns indicates that titanium substitution changes the materials' structure with different cationic distribution. An increase of the Ni/Co amount in the 3a Li site is found with the addition of titanium amount. An improved cycling performance is observed for titanium-doped cathode materials, which is interpreted to a significant suppression of phase transitions and lattice changes during cycling. The thermal stability of titanium-doped materials is also improved, which can be attributed to its lower oxidation ability and enhanced structural stability at delithiated state

[en] The band structure and dielectric properties of multilayer SnS films have been investigated by density-functional theory total-energy calculations. It shows that electric field can tune the band gap of SnS multilayer and induce a phase transition from semiconductor to semi-metal. The critical electric field of phase transition for SnS bilayer is 0.09 V/Å, which is lower than MoS_2(0.3 V/Å), MoSe_2(0.25 V/Å), MoTe_2(0.2 V/Å), WS_2(0.27 V/Å) and WSe_2(0.20 V/Å). Combining the electric structure with dielectric properties, we explain the reason why multilayer SnS films are more sensitive to the electric field. The sensitive response character to electric field makes SnS multilayer as a potential material for the nano-electronic and nano-optical devices. - Highlights: • The band gap of SnS film can be tuned effectively by electric field. • Electric field can induce a phase transition from semiconductor to semi-metal for multilayer SnS films. • We found SnS film is more sensitive to electric field than many transition metal dichalcogenides.

[en] The main purpose of the ²³⁷Np is the production of ²³⁸Pu, ²³⁸Pu is one of the most used nuclides in radioisotope battery. This paper briefly introduces the principle and application of ²³⁸Pu radioisotope battery, in combination with China's space planning, demand for ²³⁷Np was predicted. (authors)

[en] Sichuan province should take this opportunity to develop nuclear power actively since the application of nuclear power has been enhanced worldwide. It is accepted that nuclear power is one kind of safe and clean energy, and the economic has been improved greatly. Considering the electricity demands and structure conflict in near 20 years, nuclear power could solve the problem of electricity shortness in Sichuan, optimize the electricity structure and meliorate the environment, and thus maintain the sustainable development of the economy in Sichuan Province

[en] Highlights: • A hybrid nanostructure that incorporate the merits of conductive polymer nanorods and graphite oxide sheets. • A novel approach based on interface polymerization for synthesizing CP/GO@S ternary composite. • CP/GO@S ternary composite cathode shows enhanced electrochemical properties compared with CP@S binary composite cathode. • PEDOT/GO@S composite is the material system that have best electrochemical performance in all CP/GO@S ternary composites. - Abstract: The novel ternary composites, conductive polymers (CPs)/graphene oxide (GO)@sulfur composites were successfully synthesized via a facile one-pot route and used as cathode materials for Li-S batteries The poly(3,4-ethylenedioxythiophene) (PEDOT)/GO and polyaniline (PANI)/GO composites were prepared by interface polymerization of monomers on the surface of GO sheets. Then sulfur was in-situ deposited on the CPs/GO composites in same solution. The component and structure of the composites were characterized by XPS, TGA, FTIR, SEM, TEM and electrochemical measurements. In this structure, the CPs nanostructures are believed to serve as a conductive matrix and an adsorbing agent, while the highly conductive GO will physically and chemically confine the sulfur and polysulfide within cathode. The PEDOT/GO@S composites with the sulfur content of 66.2 wt% exhibit a reversible discharge capacity of 800.2 mAh g"−"1 after 200 cycles at 0.5 C, which is much higher than that of PANI/GO@S composites (599.1 mAh g"−"1) and PANI@S (407.2 mAh g"−"1). Even at a high rate of 4 C, the PEDOT/GO@S composites still retain a high specific capacity of 632.4 mAh g"−"1