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Seismic response analysis of an oil storage tank using Lagrangian fluid elements
Nagashima, Toshio,Tsukuda, Takenari Techno-Press 2013 Coupled systems mechanics Vol.2 No.4
Three-dimensional Lagrangian fluid finite element is applied to seismic response analysis of an oil storage tank with a floating roof. The fluid element utilized in the present analysis is formulated based on the displacement finite element method considering only volumetric elasticity and its element stiffness matrix is derived by using one-point integration method in order to avoid volumetric locking. The method usually adds a rotational penalty stiffness to satisfy the irrotational condition for fluid motion and modifies element mass matrices through the projected mass method to suppress spurious hourglass-mode appeared in compensation for one-point integration. In the fluid element utilized in the present paper, a small hourglass stiffness is employed. The fluid and structure domains for the objective oil storage tank are modeled by eight-node solid elements and four-node shell elements, respectively, and the transient response of the floating roof structure or the free surface are evaluated by implicit direct time integration method. The results of seismic response analyses are compared with those by other method and the validation of the present analysis using three-dimensional Lagrangian fluid finite elements is shown.
Antioxidant Properties of Enzymatic Hydrolysates from Royal Jelly
Takeshi Nagai,Reiji Inoue,Nobutaka Suzuki,Toshio Nagashima 한국식품영양과학회 2006 Journal of medicinal food Vol.9 No.3
Enzymatic hydrolysates were prepared from royal jelly using three enzymes (pepsin, trypsin, and papain), andtheir antioxidative properties were evaluated. The yield of these hydrolysates was very high, about 2026% on a raw weightbasis. In comparison with the antioxidative activities of water extract and alkaline extract of royal jelly, the antioxidative ac-tivities and scavenging activities against active oxygen species such as superoxide anion radical and hydroxyl radical of eachhydrolysate were high in the sample with a low protein concentration. These results suggest that once royal jelly is hydrolyzedusing enzyme, the hydrolysate possesses much higher antioxidative activity and scavenging activity against active oxygenspecies. Royal jelly will act as a medicinal food in the human body.