[en] A U(3)↔O(4) transitional description of diatomic molecules in the U(4) vibron model is considered. The analysis includes the U(3) and O(4) limits of the theory. Applications to vibrational-like band-heads of several diatomic molecules indicate that there are significant deviations from the O(4) limit of the theory

[en] We report the density measurement through e-3He elastic scattering with a 1.23 GeV electron beam in Jefferson Lab experiment E06-010. The extracted 3He density is (9.26 plus-minus 0.06) amagats and the N2/3He ratio is (1:49 plus-minus 0:08)%. In addition, these results are consistent with the deduced target densities based on pressure broadening measurement.

[en] We investigated the absolute elastic wave band gaps in three-dimensional systems consisting of steel inclusions embedded in plastic matrix. Numerical results show that the configurations formed by inserting an additional steel object (either a sphere of different size or a cube) into each unit cell of a simple cubic structure with spherical steel inclusions, exhibit larger absolute elastic wave band gaps compared with the original simple cubic structure. However, for simple cubic structures originally consisting of steel cubes embedded in plastic matrix, it shows inserting additional cubes results in smaller band gaps

[en] The influence of addition of sliver ions on the redox properties and catalytic performance of molybdenum-phosphate catalyst in oxidative dehydrogenation (ODH) of propane has been investigated. MoO₃ and AgMoO₂PO₄ have been detected in Ag-doped Mo-P-O catalysts. The redox properties have been characterized by H₂-temperature-programmed reduction (TPR), electronic paramagnetic resonance (EPR) and X-ray photoelectron spectroscopy (XPS). The catalytic performance of MoO₃, Ag₂O, AgMoO₂PO₄ and Ag-doped Mo-P-O catalysts has also been examined. The incorporation of Ag improved the number of Mo⁵⁺ species and the reducibility of the catalysts. The Ag-doped catalysts favor activity and selectivity in ODH of propane higher than the undoped catalyst. The best catalyst was obtained with Ag/Mo ratio of 0.3 and MoO₃/AgMoO₂PO₄ ratio of 1.1. The influence of promoter Ag⁺ on redox properties and catalytic performance is due to forming redox couple ''Ag⁰+Mo⁶⁺ ↔ Ag⁺+Mo⁵⁺'' and the synergetic effect originating from ''coherent interface'' between MoO₃ and AgMoO₂PO₄

[en] By using of the plane wave expansion method, we present the large complete elastic wave band gap in the two-dimensional three-component phononic crystals consisting of coating cylinders embedded in a glass host. Based on the localized resonance structure, the optimum gap is obtained by tuning the thickness ratio of the coating layer. The calculations also demonstrate that the acoustic band gaps varied with the filling fraction of the coating cylinders display a different character from the two-component system at the high filling fraction

[en] Thin films of energetic materials are widely studied to understand thermodynamic properties, sensitivity, nanodetonics and coarsening. In this work we investigate the fabrication of thin film energetic materials through spin coating to yield reproducible materials to study. The crystalline structure of these energetic materials is found to have a strong dependence on experimental parameters, such as the rotational speed and solution concentration. In this study, thin films of pentaerythritol tetranitrate (PETN) produced by spin coating have been systematically investigated giving films with controlled morphology. - Highlights: • The morphology of pentaerythritol tetranitrate thin films can be controlled. • The size of deposited particles depends on the spin coating process parameters. • Diffusion of metastable islands is influenced by the initial island size

[en] The author introduces a management system of instrument database. This system has been developed using with Foxpro on network. The system has some characters such as clear structure, easy operation, flexible and convenient query, as well as the data safety and reliability

[en] Highlights: • Ambient thermal energy and LNG cold energy are used as the heat source and sink. • Higher round trip efficiency than other energy storage technology is obtained. • Energy and exergy analysis are conducted with a steady-state thermodynamic model. • Genetic Algorithm is employed for optimization of some system parameters. • Sensitivity of system performance to different parameters is analyzed. - Abstract: Pumped thermal energy storage (PTES) has become a hot topic on large scale energy storage technology because of the independence on geological conditions and fossil fuels. However, few of the PTES systems have higher round trip efficiencies compared with that of pumped hydro storage except for systems utilizing external heat sources. Furthermore, the used external heat sources are not available everywhere and much additional cost is required for the system integration. As an accessible and cheap heat source, ambient thermal energy is employed in the newly proposed PTES system. LNG (liquid natural gas) cold energy is also used as the heat sink based on possible combination with the natural gas distribution system in the practical operation. The charge process is based on transcritical CO₂ heat pump cycle, while cascade design of transcritical CO₂ Rankine cycle and subcritical NH₃ Rankine cycle is employed in the discharge process. A thermodynamic model is established for energy and exergy analysis as well as the system evaluation. The analysis and evaluation of the optimized baseline case obtained by Genetic Algorithm are then carried out. In addition, the sensitivity of system performance to different variable parameters is also analyzed. Based on the analysis of optimized baseline case, the round trip efficiency can reach 139%. If for 1 MW net power output, both of the mass flow rates of CO₂ and NH₃ are 7.4 kg/s with LNG mass flow rate of 14.8 kg/s. Because of much higher round trip efficiency compared with other large scale energy storage systems, the proposed system is promising for future development and applications.

[en] Graphical abstract: An electrochemical sensor based on PAR/EGR/GCE via a cooperation of the potentiostatic technique and cyclic voltammetry was first fabricated for the determination of CPFX with satisfied detecting result of real samples. - Highlights: • PAR/EGR composite film was prepared for the first time. • The sensor can be applied to determinate CPFX in the presence of AA, UA and DA. • The sensor indicated the feasibility in drug samples and biological media. - Abstract: A glassy carbon electrode modified with poly(alizarin red)/electrodeposited graphene (PAR/EGR) composite film was prepared and applied to detect ciprofloxacin (CPFX) in the presence of ascorbic, uric acid and dopamine. The morphology and interface property of PAR/EGR films were examined by scanning electron microscopy (SEM) and electrochemical impedance spectroscopy (EIS). The electrocatalytic oxidation of CPFX on AR/EGR was investigated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The linearity ranged from 4 × 10⁻⁸ to 1.2 × 10⁻⁴ M with a detection limit (S/N = 3) of 0.01 μM. The modified electrode could be applied to the individual determination of CPFX as well as the simultaneous determination of CPFX, ascorbic acid, uric acid and dopamine. This method proved to be a simple, selective and rapid way to determine CPFX in pharmaceutical preparation and biological media

[en] Multi-physics coupling analysis based on FLUENT is a hot issue in current nuclear safety analysis. The reactor nuclear power calculation program (PKM) was prepared by using the point reactor neutron kinetic equations of 6 groups of delayed neutrons. The FLUENT/RELAP coupling analysis model and the FLUENT/PKM coupling analysis model were established by the external coupling method and secondary development coupling method respectively. The correctness and effectiveness of the coupled model were verified by the discharge problem of the horizontal branch pipe and the super-power transient problem of the linear reactivity introduced in a single-phase range. The coupled analysis method of the study can provide support for fluent multi-physics nuclear safety analysis. (authors)