756 research outputs found
The elastoplasticity behavior of wire in inhomogeneous woven metal mesh
This paper discusses the plastic behavior of wires in metal mesh for discussing the structure of woven warp and weft with their inhomogeneous and homogeneous by using finite element method (FEM). In the FEM, an isotropic plasticity is adopted as constitutive model of woven wire, but inhomogeneous between warp and weft is discussed to evaluate the mechanical characteristic of the mesh as an industrial products. Here, fundamental relation of power law hardening rule is adopted to represent the plasticity, but physical parameters of it will be controlled for the discussion of plasticity on mesh weaving. The inhomogeneous of mesh structure is one of key technology to control the product quality of metal mesh, and the mechanics of plasticity of metal mesh should be discussed to develop the product. In this report, the difference of material parameters and tension during weaving process is targeted on the discussion. Some conditions on the wires of warp and weft are examined in weaving process by FE
Existence and nature of the chloride pump
AbstractSeven widely documented mechanisms of chloride transport across plasma membranes are: anion-coupled antiport, sodium symport, sodium-potassium-chloride symport, potassium chloride symport, proton-coupled symport, an electrochemical coupling process and chloride channels. No direct genetic evidence has yet been provided for primary active chloride transport despite numerous reports of cellular Cl−- stimulated ATPases coexisting, in the same tissue, with uphill chloride transport that could not be accounted for by the four common chloride transport processes. Cl−-stimulated ATPases are a common property of practically all biological cells with the major location being of mitochondrial origin. It also appears that plasma membranes are sites of Cl−-stimulated ATPase activity. Recent studies of Cl−-stimulated ATPase activity and chloride transport in the same membrane system, including liposomes, suggest a mediation by the ATPase in net movement of chloride up its electrochemical gradient across plasma membranes. Further studies, especially from a molecular biological perspective, are required to confirm a direct transport role to plasma membrane-localized Cl−-stimulated ATPases
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