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Yang Shang-Yang,Li Shu-Cai,Xue Yi-Guo,Zhang Qing-Song 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.10
Triaxial compression tests had been performed to determine the properties of the surrounding rock. The displacement and stress of surrounding rock had been analyzed according to Silin 2 at Yungui railway under three kinds of conditions: the initial state, excavation without supporting , and supporting after excavation. Plane strain FEM was established to analyze the stability of the surrounding rock. Contrasted the monitor measuring data, the results showed that the most unfavorable position in the tunnel was found at the ridge side of the arch, and the implementation of support afforded to ensure the stability of surrounding rock, and the design of the early support approach had the ability to meet the safety requirements. The results had certain significance for understanding the mechanical behavior of shallow tunnel in unsymmetrical strata. tunnel, mechanical behaviour, numerical simulation, deformation, stability.
Fluid Solid Coupling Analysis of Large Underground Oil Storage Caverns in Containment of Groundwater
Yang Shang-Yang,Li Shu-Cai,Xue Yi-Guo,Zhang Qing-Song 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.11
Triaxial compression tests had been performed to determine the properties of the rock mass around unlining underground crude oil a storage cavern which was the first one in China. The execution situation of the tunnel project and the seepage law of groundwater were taken into account. The stress and the seepage field around the tunnel in different working states were simulated by applying Comsol around a underground crude oil storage caverns. According to the test results, it was found that the excavation process may arise the local damage. The extension of the loose zone induced by excavation ranged from 0 to 15.6 m, depending on the buried depth of the caverns. According to numerical simulation results, the crown settlement and stress concentration was depended on the buried depth and the water pressure distribution after excavation of the main cavity. This research results can provide the reference for analysis on the stability of the underground cavities under low stress level and on the water sealed underground petroleum storage rock caverns.
Yang, Jin,Cai, Lei,Zhang, Sen,Zhu, Xiangjia,Zhou, Peng,Lu, Yi 대한약학회 2014 Archives of Pharmacal Research Vol.37 No.3
This study aimed to investigate whether silicacerium (III) chloride ($CeCl_3$) nanoparticles could inhibit the formation of advanced glycation end-products (AGEs) and reduce oxidative stress. Silica-$CeCl_3$ nanoparticles were synthesised by adsorption and embedment with micro-silica materials, forming uniform nanoparticles with a diameter of approximately 130 nm. Chaperone activity assays and AGEs formation assays, and intracellular reactive assays were adopted in this study to evaluate $CeCl_3$ nanoparticles effect. UV-visible spectrometry showed that silica-$CeCl_3$ nanoparticles at low concentrations rapidly formed tentatively stable conjugations with ${\alpha}$-crystallin, greatly enhancing the chaperone activity of ${\alpha}$-crystallin. Moreover, silica-$CeCl_3$ nanoparticles markedly inhibited the fructose-induced glycation of ${\alpha}$-crystallin, showing an advantage over the control drugs aminoguanidine and carnosine. Silica-$CeCl_3$ nanoparticles also reduced intracellular reactive oxygen species production and restored glutathione levels in $H_2O_2$-treated human lens epithelial cells. These findings suggest that silica-$CeCl_3$ may be used as a novel agent for the prevention of cataractogenesis.
Behaviors of box-shape steel reinforced concrete composite beam
Yang, Chun,Cai, Jian,Wu, Yi,He, Jiangang,Chen, Haifeng Techno-Press 2006 Structural Engineering and Mechanics, An Int'l Jou Vol.22 No.4
Experimental studies on the behaviors of box-shape steel reinforced concrete (SRC) composite beams were conducted. Seven 1:3 scale model composite beams were tested to failure. Each of the beams was simply supported at the ends and two concentrated loads were applied at the one-third span and two-thirds span respectively. Experimental results indicate that the flexural strength can be enhanced when the ratio of flexural reinforcements and flange thickness of the shape steel are increased; the shear strength is enhanced with increase of web thickness of the shape steel. Insignificant effects of concrete in the box-shape steel are found on improving the flexural strength and shear strength of the box-shape SRC composite beams, thus concrete inside the box-shape steel can be saved, and the weight of the SRC beams can be decreased. Shear studs can strengthen the connection and co-work effects between the shape steel and the concrete and enhance the shear strength, but stud design for the composite beams should be further improved. Formulas for flexural and shear strength of the composite beams are proposed, and the calculated results are in good agreement with the experimental results. In general, the box-shape SRC composite beam is a kind of ductile member, and suitable for extensive engineering application.
Pumo Cai,Jingfang Hong,Cong Wang,Yanchuan Yang,Chuandong Yi,Jiahua Chen,Qinge Ji 한국응용곤충학회 2018 Journal of Asia-Pacific Entomology Vol.21 No.1
Co-60 radiation has been broadly used for pest management because it results in male sterility and a lack ofemergence of unparasitized hosts due to oxidative damage. Insect life is significantly affected by abiotic stressfactors, including Co-60 radiation. In the present study, we determined the influence of Co-60 radiation on animportant pest in southern China, the oriental fruit fly Bactrocera dorsalis (Diptera: Tephritidae). We exposed 30-h-old B. dorsalis eggs to Co-60 radiation at doses of (0, 5, 10, 15, 20, 25, 30, 35, and 40 Gy) and determined theactivity of the antioxidant enzymes superoxide dismutase (SOD), catalase (CAT), and peroxidase (POX). CAT andPOX activity significantly increased in B. dorsalis in the 1st larvae instar after high-intensity radiation doses(25–40 Gy) and played an important role in the antioxidant response to intensive radiation. The activity of POXin B. dorsalis at the 2nd larval instar sharply decreased after different doses of radiation, except for 10 and 40 Gy. Our results demonstrated that Co-60 radiation affected the activity of antioxidant enzymes and disturbed thephysiology of B. dorsalis, especially at early stages (the 1st, 2nd larvae instar). These three antioxidant defenseenzymes cooperatively play an important role in protecting B. dorsalis from oxidative damage.