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Machining Surface Quality Analysis of Aluminum Alloy Thin-Walled Parts in Aerospace
Dai Bing,Yu Guang-bin,Guan Yan-qi,Shao Jun-peng,Guan Yan-qi,Wu Xue-mei,Liu Yu-xin 보안공학연구지원센터 2015 International Journal of Security and Its Applicat Vol.9 No.11
There are many key parts in the field of aerospace with aluminum alloy thin-walled parts, the problem of breaking the low efficiency in production that’s also followed. There will be a lot of deformation in processing because of its poor rigidity, poor process, which will lead to low processing efficiency. It is of great significance to improve the machining efficiency of the aluminum alloy thin-walled parts, and a series of analysis of the surface quality of aluminum alloy thin-walled parts there are carried out clamping, cutting tools, take the knife route so on, and the problems of low machining efficiency and poor surface quality are solved.
Behavior of circular concrete-filled steel tubular columns under pure torsion
Fa-Xing Ding,QIANG FU,Bing Wen,Qi-shi Zhou,Xue-mei Liu 국제구조공학회 2018 Steel and Composite Structures, An International J Vol.26 No.4
Concrete-filled steel tubular (CFT) columns are commonly used in engineering structures and always subjected to torsion in practice. This paper is thus devoted to investigate the mechanical behavior of circular CFT columns under pure torsion.3D finite element models based on reasonable material constitutive relation were established for analyzing the load-strain (<i>T-–γ</i>) curves of circular CFT columns under pure torsion. The numerical simulation indicated that local bulking of the steel tube in CFT columns was prevented and the shear strength and ductility of the core concrete were significantly improved due to the confinement effect between the steel tube and the core concrete. Based on the results, formulas to predict the torsional ultimate bearing capacity of circular CFT columns were proposed with satisfactory correspondence with experimental results. Besides, formulas of composite shear stiffness and the overall process of the <i>T-–γ</i> relation of circular CFT columns under pure torsion were proposed.
Dao-Zong Xia,Xin-Fen Yu,Hui-Ming Wang,Qi-Ya Ren,Bing-Mei Chen 한국식품영양과학회 2010 Journal of medicinal food Vol.13 No.4
To investigate the anti-obesity and hypolipidemic effects of Alpinia officinarum ethanolic extract (AOE) for the first time, anti-obesity models in vivo were used. Ten male Sprague-Dawley rats were fed normal control diet (NC); other groups of rats were fed a high-fat diet (HFD) with or without different proportions of AOE (AOE-1, 3%; AOE-2, 5%) for 6 weeks to examine feed intake, body and adipose tissue weight, serum total cholesterol (Total-C), triacylglycerol (TG), high-density lipoprotein cholesterol (HDL-C), low-density lipoprotein cholesterol (LDL-C), and leptin levels, alanine aminotransferase (ALT) and aspartate aminotranferase activities, hepatic Total-C and TG levels, and the pathological changes in liver and epididymal adipose tissues. Interestingly, feed intakes among the experimental groups were not significantly different. Body weight gains were significantly lowered in the AOE-1 and AOE-2 groups compared with the HFD group (P<.05) and near to the level of the NC group. AOE also improved the lipid profile in serum and the pathological changes in liver and adipose tissue and decreased the relative weights of epididymal and perirenal white adipose tissues. They improved lipid profile by lowering serum Total-C, TG, and LDL-C concentrations, leptin content, and the atherogenic index compared with the HFD group. The HDL-C concentration and the ratio of HDL-C/Total-C significantly increased compared with those of the HFD group. The serum ALT activity of the AOE-2 group was notably lower than that of the HFD group. Our data suggest that AOE can be considered as an anti-obesity agent that is effective for suppressing body weight gain and decreasing lipid profile.