[en] Atom transfer radical polymerization (ATRP) catalyzed by N,N',N',N'',N''-pentamethyldiethylenetriamine (PMDETA)/CuBr was performed to synthesize poly (tert-butyl acrylate) (PtBA-Br) with predesigned molecular weight and narrow polydispersity. Using the PtBA-Br as macroinitiator, the PtBA-block-PS copolymer was prepared through ATRP. After terminated bromine atom was converted to end-functional azide group (P(tBA-b-St)-N₃), C₆₀ end-capped PtBA-PS block copolymers (P(tBA-b-St)-C₆₀) were synthesized by reacting C₆₀ with P(tBA-b-St)-N₃. GPC characterizations showed that C₆₀ was chemically bonded to the end of P(tBA-b-St) chain and the products were mono-substituted. FT-IR, UV-Vis measurements confirmed that hydrolysis of P(tBA-b-St)-C₆₀ resulted in amphiphilic C₆₀ end-capped PAA-PS block copolymers. In additional, the photoconductivity of P(tBA-b-St)-C₆₀ was measured

[en] The high hardness and fragility of the PZT ceramics make it difficult for mechanical processing, especially in the processing of fine-scale composites. The present article applies gelcasting technique to the fabrication of ceramic frameworks for piezoelectric composites. Because of the excellent mechanical property of the gelcast green body, a green body dicing and later sintering way will successfully prevent the cracks inherently associated with the conventional ceramics dicing way. Homogeneous ceramic frameworks can be successfully fabricated by this novel method. The high density and strong piezoelectric effect of the gelcast sample also make it an especially suitable way for forming piezoelectric materials and piezocomposites

No abstract available

[en] Highlights: • The viscosities of the carbonated AMP-PZ aqueous solutions were measured. • The experiments were modeled satisfactorily by using the Weiland equation. • The influence of the mass fractions of amines on the viscosity was illustrated. • The temperature and CO₂ loading dependences of the viscosity were demonstrated. -- Abstract: The viscosities (η) of carbonated 2-amino-2-methyl-1-propanol (AMP)-piperazine (PZ) aqueous solutions were measured by using a NDJ-1 rotational viscometer, with temperatures ranging from 298.15 K to 323.15 K. The total mass fraction of amines ranged from 0.3 to 0.4. The mass fraction of PZ ranged from 0.05 to 0.10. The Weiland equation was used to correlate the viscosities of both CO₂-unloaded and CO₂-loaded aqueous solutions and the calculated results agreed well with the experiments. The effects of temperature, mass fractions of amines and CO₂ loading (α) on the viscosities of carbonated aqueous solutions were demonstrated on the basis of experiments and calculations

[en] Highlights: • We propose a SCWR fuel assembly with two-row fuel rods between the hexagonal moderator channels. • The new concept can resolve the contradiction between uniform and sufficient moderation. • Structural size and thermal–hydraulic performance are taken account of in the fuel assembly. • Larger infinite multiplication factor and smaller local power peaking factor could be obtained. • Two two-row hexagonal fuel assembly concepts are proposed for the engineering application. - Abstract: A new hexagonal fuel assembly (FA) design which has two rows of fuel rods between the hexagonal moderator channels is proposed for the thermal supercritical water cooled reactor (SCWR). The new concept is well considered for the performance of uniform moderation and sufficient moderation, and with respect to structural size and thermal–hydraulic performance. The neutron physical performance of the two-row hexagonal FA with acceptable configuration is discussed. The results show clearly that a better balance between uniform moderation and sufficient moderation can be obtained in the two-row hexagonal fuel assembly

[en] Highlights: • Measured solubility data of CO₂ in 2-methoxyethyl acetate, 1-methoxy-2-propyl acetate and 3-methoxybutyl acetate. • Calculated Henry’s constant and thermodynamic properties of selected systems. • Concluded that selected absorbents have potential research value for CO₂ capture. - Abstract: The solubilities of CO₂ in 2-methoxyethyl acetate, 1-methoxy-2-propyl acetate, and 3-methoxybutyl acetate were measured by isothermal synthesis method under pressures up to 1.2 MPa and at temperatures ranging from (293.15 to 333.15) K. Henry’s constant was calculated based on experimental data regression. The solubilities of CO₂ were found to increase with decreased temperature and increased the methyl group to the molecular structure of the absorbent. Henry’s constant and volumetric solubility of selected absorbents at T = 298.15 K were compared with those of commercial absorbents and common solvents. 3-Methoxybutyl acetate showed the best performance by mole fraction, and 2-methoxyethyl acetate behaved the best by volumetric fraction. Based on Henry’s constant, thermodynamic properties such as Gibbs free energy of solution, enthalpy of solution, and absorption entropy of solution were determined. These properties are very essential for designing an absorption process

[en] In environmental impact assessment on the radioactive gaseous effluents under normal condition of nuclear facilities, some factors which effect the long term atmospheric dispersion factor or the largest individual dose are introduced. These elements include the way of getting meteorologic factor, change of the joint frequency atmospheric stability, adjustment the atmospheric dispersion model, adoption of dose conversion factor, etc. The suggestions of standardizing and simplifying the assessment method are put forward

[en] A set of models and default parameters are recommended for effect assessment of radioactive airborne effluents under normal condition of nuclear facilities, in order to standardize the environmental effect assessment of nuclear facilities, and to simplify the observation and investigation in early phase. The author introduces the physics models

[en] In this study, 45 carbon steels were boronized, borosulphurized and RE-borosulphurized at 950 °C for 6 h, respectively. The samples were then characterized by scanning electron microscopy, X-ray diffraction, Auger electron spectroscopy, microhardness tester and ring-on-block wear tester. It has shown that the diffusion front (the interface between the diffusion layer and the substrate) of the boride layer (BL) and the boro-sulfide layer (BSL) is saw tooth shape, while the diffusion front of the RE-boro-sulfide layer (RBSL) is flat. Compared with BSL layer, RBSL layer has a smaller and more uniform grain size, and a flatter hardness gradient from the surface to the diffusion front. The RBSL layer, consisting of an outer layer (from surface to 30 μm) mainly composed of Fe-B and an inner layer (from 30 μm to the diffusion front) mainly composed of Fe-S, has the best wear resistance and the most sufficient adhesion among those three.

[en] The author introduces the study on behaviour of tritium and carbon-14 in the environment and its assessment, which is completed by Chalk River Laboratory in Canada