The exact analytic solution of the pure bending beam of metallic foams is given. The effects of relative density of the material on stresses and deformation are revealed with the Triantafillou and Gibson constitutive ...The exact analytic solution of the pure bending beam of metallic foams is given. The effects of relative density of the material on stresses and deformation are revealed with the Triantafillou and Gibson constitutive law （TG model） taken as the analysis basis. Several examples for individual foams are discussed, showing the importance of compressibility of the cellular materials. One of the objects of this study is to generalize Hill＇s solution for incompressible plasticity to the case of compressible plasticity, and a kinematics parameter is brought into the analysis so that the velocity field can be determined.展开更多
Oxidatively modified low density lipoprtein (LDL) plays an important role in atheroslerosis (AS) development. To investigate the role of neferine (Nef) in anti-LDL oxidation and foam cell formation, the lipoprotein wa...Oxidatively modified low density lipoprtein (LDL) plays an important role in atheroslerosis (AS) development. To investigate the role of neferine (Nef) in anti-LDL oxidation and foam cell formation, the lipoprotein was derived and subjected to three different treatments: N-LDL (normal LDL), Cu(2+) +LDL and Cu(2+)+Nef+LDL. The LDLs were put at 25℃ for 24 h and the thiobarbituric acid reactive substance (TBARS) values were determined. They were 0. 57 ±0. 02, 6.01±0. 22 and 2. 26±0. 13 nmol/mg protein, respectively. The difference was very significant (P<0.01) for each two groups by t test. Mouse peritoneal macrophage (MΦ) were exposed to 50 μg protein/ml of Cu(2+) + LDL and Cu(2+)+Nef+LDL at 37℃ for 60 h. The tryglyceride (TG) and total cholesterol (TC) content in Mad were assayed. The results showed that Cu(2+) + LDL was more efficient than Cu(2+)+Nef+LDL in stimulating lipid accumulation in MΦ(P <0. 001). The study demonstrated that Nef could inhibit Cu(2+)-mediated LDL oxidation and thereby inhibiting macrophage-derived foam cell formation.展开更多
The foamed aluminum alloys with different densities were fabricated by melt foaming technique. The compressive properties and energy absorption of the foamed aluminum alloy with different densities were analyzed. The ...The foamed aluminum alloys with different densities were fabricated by melt foaming technique. The compressive properties and energy absorption of the foamed aluminum alloy with different densities were analyzed. The results reveal that the compressive stress-strain curves follow the typical behavior of cellu- lar foams with three deformation stages. Under the same strain, the energy absorption capability decreases with the decrease of density. However, with increasing the strain, the energy absorption efficiency of foamed metal increases initially and then decreases. The lower the density, the longer the plateau region, within the range of high strain, the energy absorption efficiency is always high.展开更多
文摘The exact analytic solution of the pure bending beam of metallic foams is given. The effects of relative density of the material on stresses and deformation are revealed with the Triantafillou and Gibson constitutive law （TG model） taken as the analysis basis. Several examples for individual foams are discussed, showing the importance of compressibility of the cellular materials. One of the objects of this study is to generalize Hill＇s solution for incompressible plasticity to the case of compressible plasticity, and a kinematics parameter is brought into the analysis so that the velocity field can be determined.
文摘Oxidatively modified low density lipoprtein (LDL) plays an important role in atheroslerosis (AS) development. To investigate the role of neferine (Nef) in anti-LDL oxidation and foam cell formation, the lipoprotein was derived and subjected to three different treatments: N-LDL (normal LDL), Cu(2+) +LDL and Cu(2+)+Nef+LDL. The LDLs were put at 25℃ for 24 h and the thiobarbituric acid reactive substance (TBARS) values were determined. They were 0. 57 ±0. 02, 6.01±0. 22 and 2. 26±0. 13 nmol/mg protein, respectively. The difference was very significant (P<0.01) for each two groups by t test. Mouse peritoneal macrophage (MΦ) were exposed to 50 μg protein/ml of Cu(2+) + LDL and Cu(2+)+Nef+LDL at 37℃ for 60 h. The tryglyceride (TG) and total cholesterol (TC) content in Mad were assayed. The results showed that Cu(2+) + LDL was more efficient than Cu(2+)+Nef+LDL in stimulating lipid accumulation in MΦ(P <0. 001). The study demonstrated that Nef could inhibit Cu(2+)-mediated LDL oxidation and thereby inhibiting macrophage-derived foam cell formation.
文摘The foamed aluminum alloys with different densities were fabricated by melt foaming technique. The compressive properties and energy absorption of the foamed aluminum alloy with different densities were analyzed. The results reveal that the compressive stress-strain curves follow the typical behavior of cellu- lar foams with three deformation stages. Under the same strain, the energy absorption capability decreases with the decrease of density. However, with increasing the strain, the energy absorption efficiency of foamed metal increases initially and then decreases. The lower the density, the longer the plateau region, within the range of high strain, the energy absorption efficiency is always high.
