期刊：
Applied Mechanics and Materials,2017年858:300-304 ISSN：1662-7482
作者机构：
[Zhen-fu Chen; Dan Wu; Qiuwang Tao; Yuanchu Gan] School of urban construction, university of South China
会议名称：
International Conference on Civil,Architectural,Structural and Constructional Engineering（ICCASCE 2016）
会议时间：
2016-07-15
会议地点：
Busan,South Korea
摘要：
The high temperature stability of AC-16, AC-13, AC-20 under specimen thickness of 5cm and 6cm is studied through indoor asphalt mixture high rutting test, Through comparison and analysis about experimental data, it is found that the stability of AC-16, AC-13, AC-20 asphalt mixture at high- temperature decreases in turn. It is shown that thickness changes did not affect the change trend of the high temperature stability under gradation change, and the stability of AC-16 at high-temperature is the best, the AC-13 is second and the AC-20 is less.
摘要：
The effect of gamma-ray irradiation on waste activated sludge (WAS) dewaterability was investigated with irradiation doses of 0–15 kGy. Time to filter (TTF50), specific resistance of filtration (SRF) and water content of sludge cake were measured to evaluate sludge dewaterability. Soluble chemical oxygen demand (SCOD), soluble extracellular polymeric substances (EPS) concentration and sludge particle size were determined to explain changes in sludge dewaterability. The optimal irradiation dose to obtain the maximum dewaterability characteristics was 1–4 kGy, which generated sludge with optimal disintegration (1.5–4.0%), soluble EPS concentration (590–750 mg/L) and particle size distribution (100–115 µm diameter). The combination of irradiation and cationic polyacrylamide (CPAM) addition exhibited minimal synergistic effect on increasing sludge dewatering rate compared with CPAM conditioning alone.
作者机构：
[宋百姓; 柯国军] School of Urban Construction, University of South China, Hengyang;Hunan;421001, China;[潘坚文] State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing;100084, China
通讯机构：
[Pan, J.-W.] S;State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing, China
摘要：
Fe(II)-Al(III) layered double hydroxides (Fe-Al LDHs) were prepared by the sono-assisted precipitation method and used for the removal of uranium (VI) from aqueous solutions. The application of ultrasound in the Fe-Al LDHs preparation promoted the formation of the hydrotalcite-like phase and improved the adsorption capacity of U(VI). Batch experiments were carried out to investigate the influence of solid-to-solution ratio, initial U(VI) concentration, initial pH, contact time and temperature on the U(VI) removal process. The experimental results indicated that the removal process of U(VI) could be well described by the pseudo-second-order kinetic model. The equilibrium isotherm for U(VI) removal was fitted by the Langmuir model and the maximum adsorption capacity of Fe-Al LDHs was 113.64 mg/g at a temperature of 308 K. The thermodynamic parameters implied that the removal of U(VI) was essentially an endothermic process. The FT-IR, EDX and XPS results suggested that the removal mechanism involves combined adsorption-reduction processes. When the U(VI) ions absorbed onto the Fe-Al LDHs through physical adsorption, the Fe(II) in the structure of Fe-Al LDHs reduces U(VI) to U(IV) while Fe(II) was oxidized to Fe(III). (C) 2017 Elsevier B.V. All rights reserved.
摘要：
For sandwich beams with second-order hierarchical corrugated truss core under three-point bending, a correction factor of shear deflection was firstly proposed to improve the prediction accuracy of the bending analysis, which was verified by finite element analysis and compared with the original formula. Then, the failure modes of the sandwich beam under bending were analyzed, including four competing modes of the large struts (i.e. plastic yielding, buckling, wrinkling of facesheet, shear buckling) and two competing modes of the small struts (i.e. plastic yielding, buckling). Subsequently, the analytical expressions of critical load for each failure mode were derived. On this basis, the failure mechanism maps were constructed. Finally, several typical points from the map were selected and verified by finite element analysis, and a good agreement of predicted failure modes was observed.
摘要：
MWNTs are reacted with CM-β-CD to obtain CM-β-CD-g-MWNTs with great dispersivity. The effects of pH value, initial concentration of uranium, contact time and adsorbent dosage on the adsorption behavior were investigated. The results show that pH=5,the initial concentration of uranium was 10mg/L, the adsorption of uranium on CM-β-CD-g-MWNTs after 90 min, and the adsorption capacity is 19.42 mg/g at 25°C. Kinetics and isothermal were better fitted by Langmuir isotherm model and pseudo-second-order kinetic model, and the maximum adsorption capacity was 92.65mg/g. The composites had been antegrallty made, the -C=O,-C-O and -OH palyed irreplaceable role by SEM,EDS and FTIR.
