The relations of bulk modulus, shear modulus, Young's modulus and the Poisson's ratio with porosity of foam plastics are determined by a three phase spheroidal model commonly used in Composite Mechanics. The r...The relations of bulk modulus, shear modulus, Young's modulus and the Poisson's ratio with porosity of foam plastics are determined by a three phase spheroidal model commonly used in Composite Mechanics. The results are compared with those using differential scheme. It is shown that the material properties derived from the present model normally are larger than those obtained by differential scheme for foam plastics with identical porosity. The differences in shear moduli and Young's moduli obtained by the two methods are small but they are larger for bulk moduli of incompressible matrix and Poisson's ratios. The Young's moduli of high density foam plastics derived by the present model agree better with experimental ones.展开更多
IT has been found that heat shock proteins (hsp) exist universally in animals, plants, microbesand human beings. Some of hsps possess functions of molecular chaperons, such as hsp60,hsp70 and hsp90, which participate ...IT has been found that heat shock proteins (hsp) exist universally in animals, plants, microbesand human beings. Some of hsps possess functions of molecular chaperons, such as hsp60,hsp70 and hsp90, which participate in folding and assembling polypeptides to functional struc-tures and transferring them into suitable sites. They also undertake repairing damaged cellularDNA and nucleolus. Therefore, they are house-keeping proteins and play an importantrole in maintaining normal cellular life and functions and in cellular response to environmentalstresses. There exists high homology in DNA sequence among the hsp of the same molecularweight across species. We have first reported the close relationship between hsps展开更多
基金Supported by the National Natural Science Foundation of China and Laboratory for Nonlinear Mechanics of Continuous Media,Institute of Mechanics,Chinese Academy of Sciences.
文摘The relations of bulk modulus, shear modulus, Young's modulus and the Poisson's ratio with porosity of foam plastics are determined by a three phase spheroidal model commonly used in Composite Mechanics. The results are compared with those using differential scheme. It is shown that the material properties derived from the present model normally are larger than those obtained by differential scheme for foam plastics with identical porosity. The differences in shear moduli and Young's moduli obtained by the two methods are small but they are larger for bulk moduli of incompressible matrix and Poisson's ratios. The Young's moduli of high density foam plastics derived by the present model agree better with experimental ones.
文摘IT has been found that heat shock proteins (hsp) exist universally in animals, plants, microbesand human beings. Some of hsps possess functions of molecular chaperons, such as hsp60,hsp70 and hsp90, which participate in folding and assembling polypeptides to functional struc-tures and transferring them into suitable sites. They also undertake repairing damaged cellularDNA and nucleolus. Therefore, they are house-keeping proteins and play an importantrole in maintaining normal cellular life and functions and in cellular response to environmentalstresses. There exists high homology in DNA sequence among the hsp of the same molecularweight across species. We have first reported the close relationship between hsps
