[en] A mathematical model has been developed to study heat transfer and thermal management of lithium-polymer batteries. Temperature dependent parameters including the diffusion coefficient of lithium ions, ionic conductivity of lithium ions, transference number of lithium ions, etc., have been added to a previously developed electrochemical model to more completely characterize the thermal behavior of the lithium-polymer system. In addition, experimental studies of the discharge behavior and heat generation rate of lithium-polymer cells have been conducted. Comparisons between experimental and mathematical results are presented. Finally different thermal management approaches are discussed

[en] In the paper, four methods of reactor pool water level measurement within narrow rang in China Advanced Research Reactor (CARR) are described. Four methods of measurement are segregate flange differential pressure transmitter measurement, huffing measurement, absolute pressure transmitter measurement, and differential pressure transmitter measurement. Then we selected the best one from them and analyzed measurement error of selected method. The results show that the method of differential pressure transmitter measurement can meet our requirement. (authors)

[en] In the light of derivative coupling models, we argue that the zero-point energy of the vacuum could not be simply thrown away at high temperature. So here the finite contribution which is temperature dependent has been separated from it and the influence of this correction on effective nucleon mass in nuclear matter has been studied

[en] Graphical abstract: - Highlights: • A uniform MnO₂ layer was anchored onto diatomite surface. • Kinetics and isotherms over MnO₂ modified diatomite were studied. • The Pb(II) adsorption is based on ion-exchange mechanism. - Abstract: A novel method to produce composite sorbent material compromising porous diatomaceous earth (DE) and surface functionalized amorphous MnO₂ is reported. Via a simple in situ redox reaction over the carbonized DE powders, a uniform layer of amorphous MnO₂ was anchored onto the DE surface. The hybrid adsorbent was characterized by X-ray diffraction, scanning electron microscopy, and infrared spectroscopy. The batch method has been employed to investigate the effects of surface coating on adsorption performance of DE. According to the equilibrium studies, the adsorption capacity of DE for adsorbing lead ions after MnO₂ modification increased more than six times. And the adsorption of Pb²⁺ on the MnO₂ surface is based on ion-exchange mechanism. The developed strategy presents a novel opportunity to prepare composite adsorbent materials by integrating nanocrystals with porous matrix

[en] In the framework of thermal field dynamics, the reaction process in QGP is investigated. It is found that the statistical effect of the internal lines cannot be neglected. The contribution of thermal vacuum polarization to the dilepton production rate is also calculated

[en] We develop a facile method for the synthesis of size-controlled nano-crystaline palladium incorporated into ordered mesoporous carbon (OMC) as oxygen reduction reaction (ORR) electrocatalyst, applied in the cathode of fuel cell and metal-air battery. The catalyst with 18 wt.% Pd in ordered mesoporous carbon, pyrolyzed at 900 °C shows excellent catalytic performance for ORR. The onset and half-wave potentials are 0.963 V and 0.872 V (vs. RHE) in 0.1 M KOH, respectively, which are comparable to those of commercial 30 wt.% Pt/C, 0.975 V and 0.854 V (vs. RHE). The catalyst with 12 wt.% Pd in ordered mesoporous carbon shows largest limiting current density when the current is normalized by the mass of noble metal. The efficient utilization of active Pd in the mesoporous carbon framework endows the catalyst an almost direct four-electron reduction pathway. The transferred electron number of 12Pd-OMC-900 is calculated to be 4.14 at 0.4 V (vs. RHE). Its excellent ORR activity should be ascribed to the optimized balance between active sites (Pd nanoparticles) density and capability for mass and charge transport. In addition, the protection for active moieties in the OMC frameworks contributes to its superior durability compared with Pt/C.

[en] Finite temperature renormalization group equation is employed to investigate the effective coupling constant of QCD with respect to temperature. At high temperature, it is very small over the entire region of momentum. This leads to the property of deconfinement of QCD

[en] The principle of the liquid scintillation coincidence, the measuring apparatus, the results of measurement of ¹⁴C radionuclide activity and comparison are described

[en] The paper studies caused uranium volcanic texture, distribution of volcanic uranium mineralization and existing rule according to the interpretation of ETM+ map for the volcanic rock belt in the east of Xuemistan volcanic rock belt which is about 130 km in length, 15∼20 km in width. Caused uranium volcanic texture distributes mainly in Yangzhang-Bayinbulak fault and its north, such as Yangzhang, Yinisala, Bayinbulak, Shiyue, Hakedun volcanic texture ect. Break forth type form west to east is focus model that transited cranny type gradually. Form west to east, the denudation of volcanic texture increases gradually, and Uranium mineralization becomes volcano breaking type from subvolcanic type. At present, more uranium mineralization discovered in the margin of volcanic apparatus, it is belong to late tectonic mineralization. Other uranium mineralizations lie in the bowel of volcano channel, but we have not developed profundly anatomize. It is suggested that further studies and prospecting work in volcano channel should be enhanced. (authors)

[en] Three-dimensional carbon fiber zirconium carbide–silicon carbide composite (3D C_f/ZrC–SiC) was prepared by precursor infiltration and pyrolysis (PIP) with reactive melt infiltration (RMI) process. The 3D C_f/C–SiC substrate with open porosity of 20% and density of 1.35 g/cm³ was designed to be infiltrated by Zr_0.912Si_0.088 intermetallic compound. Thermodynamics calculations revealed that C could react with liquid Zr_0.912Si_0.088 to form ZrC at 1600 °C. Composites were prepared by heating the two materials to 1600 °C for 1 h in vacuum. The micro-structural, mechanical and ablative properties of the 3D C_f/ZrC–SiC composite were studied. ZrC and SiC were identified to be the main constituents. The flexural strength of the composite was 101.5±8.16 MPa and the elastic modulus was 35.18±9.58 GPa. The mass loss rate and linear recession rate of the 3D C_f/ZrC–SiC composite during oxyacetylene torch test were 0.013 g/s and 0.022 mm/s, respectively. The formation of ZrO₂ melt on the surface of the composite contributed mainly to the excellent ablative property