13,242 research outputs found
Two-dimensional topological solitons in rectangular magnetic dots
A general approach allowing to find the analytical expressions for
equilibrium magnetic structures in small and flat magnetic nano-sized cylinders
of arbitrary shape made of soft magnetic material is presented. The resulting
magnetization distributions are two-dimensional topological solitons and have a
non-zero topological charge. The approach is illustrated here on an example of
a thin rectangular particle.Comment: 3 pages, 2 figures, RevTex, for SCM2001 (Seeheim, Germany, 2001),
satellite of JEMS'01 conferenc
Error estimates of a stabilized Lagrange-Galerkin scheme for the Navier-Stokes equations
Error estimates with optimal convergence orders are proved for a stabilized
Lagrange-Galerkin scheme for the Navier-Stokes equations. The scheme is a
combination of Lagrange-Galerkin method and Brezzi-Pitkaranta's stabilization
method. It maintains the advantages of both methods; (i) It is robust for
convection-dominated problems and the system of linear equations to be solved
is symmetric. (ii) Since the P1 finite element is employed for both velocity
and pressure, the number of degrees of freedom is much smaller than that of
other typical elements for the equations, e.g., P2/P1. Therefore, the scheme is
efficient especially for three-dimensional problems. The theoretical
convergence orders are recognized numerically by two- and three-dimensional
computations
Automotive Stirling engine development program: A success
The original 5-yr Automotive Stirling Engine Development Program has been extended to 10 years due to reduced annual funding levels. With an estimated completion date of April 1988, the technical achievements and the prospectives of meeting the original program objectives are reviewed. Various other applications of this developed Stirling engine technology are also discussed
Sectorial sift, inverted U-shaped fertility dynamics, and growth
This paper constructs a small open two-sector overlapping-generations model with the subsistence level of consumption of agricultural goods and explains the following key stylized facts in the process of economic development: increases followed by declines in fertility rate, increases in human capital investment for children, and a sectorial shift in labor from agriculture to manufacture.Demographic transition Sectorial sift Economic development
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