Numerical simulations of the behavior of machine tools are usually based on a finite element (FE) discretization of their mechanical structure. In order to capture all necessary details FE models are in general very large and sparse. Hence the computation of the simulation takes an unacceptable long time and requires much memory space. To calculate the results in reasonable time typically modal...

The triangulation of boundary representation geomet-ries (BRep geometries) is neccessary for display generation , stereo-lithography applications and also nite element mesh (FE mesh) generation. The accuracy of the tesselation is of great signiic-ance not only for stereo-lithography and rendering algorithms but also for FE mesh generation, since even minor simpliications of the geometry of the ...

Background: Determining the stability of a callus distraction is today largely based on measurement of bone density and qualitative evaluation of bone structure on plain radiographs. In the present study, we demonstrate how computed tomography (CT) and finite element (FE) models can be used together in a simple and effective manner to evaluate the healing of a leg lengthening. Method of Approac...

The synthesis of two molecular iron complexes, a dinuclear iron(iii,iii) complex and a nonanuclear iron complex, based on the dinucleating ligand 2,2'-(2-hydroxy-5-methyl-1,3-phenylene)bis(1H-benzo[d]imidazole-4-carboxylic acid) is described. The two iron complexes were found to drive the oxidation of water by the one-electron oxidant [Ru(bpy)3](3+).

Following the results of cite{Med}, regarding the Aluthge transform of polynomial matrices, the symbolic computation of the Duggal transform of a polynomial matrix $A$ is developed in this paper, using the polar decomposition and the singular value decomposition of $A$. Thereat, the polynomial singular value decomposition method is utilized, which is an iterative algorithm with numerical charac...

Its January—summertime! The sun is up high, the surf is good, the sky is blue and the sand is golden and hot. As these lines are written, the author has settled on the beautiful beaches of New Zealand’s Northland. Unconventional methods of computation seem all but a remote possibility. And yet, many of today’s speculations become tomorrow’s physics and key technologies of the future. The questi...

Rate equations and kinetic parameters were obtained for various reactions involved in the bacterial oxidation of pyrite. The rate constants were 3.5 muM Fe per min per FeS(2) percent pulp density for the spontaneous pyrite dissolution, 10 muM Fe per min per mM Fe for the indirect leaching with Fe, 90 muM O(2) per min per mg of wet cells per ml for the Thiobacillus ferrooxidans oxidation of wash...

The East Asian summer monsoon controls the climatic regime of an extended region through temperature and precipitation changes. As the East Asian summer monsoon is primarily driven by the northern hemisphere summer insolation, such meteorological variables are expected to significantly change on the orbital timescale, influencing the composition of terrestrial sediments in terms of both mineral...

Two structurally characterized dinuclear valence tautomers are described. Cobalt ions are bridged by p- and m-phenylene units connected to 2,2'-bipyridines. X-ray crystal structures show that the molecules are in the [(Co(III))(Co(III))] forms at ca. 125 K, while spectroscopic studies show that both molecules can achieve the [(Co(II))(Co(II))] form above 400 K and confirm the [(Co(III))(Co(III)...

Surrogate model (SM)-based optimization approaches have gained significant attention in recent years due to their ability find optimal solutions faster than finite element (FE)-based methods. However, there is limited previous literature available on the detailed process of constructing SM-based for multi-parameter, multi-objective design electric machines. This paper aims present a systematic ...