Peter Leinen

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The paper presents the mathematical concepts underlying the new adaptive finite element code KASKADE, which, in its present form, applies to linear scalar second-order 2-D elliptic problems on general domains. Starting point for the new development is the recent work on hierarchical finite element bases due to Yserentant (1986). It is shown that this(More)
The nite mass method, a new Lagrangian method for the numerical simulation of gas ows, is presented and analyzed. In contrast to the nite volume and the nite element method, the nite mass method is founded on a discretization of mass, not of space. Mass is subdivided into small mass packets of nite extension each of which is equipped with nitely many(More)
Two experiments utilizing a spatial-temporal movement sequence were designed to determine if the memory of the sequence is lateralized in the left or right hemisphere. In Experiment 1, dominant right-handers were randomly assigned to one of two acquisition groups: a left-hand starter and a right-hand starter group. After an acquisition phase, reaction time(More)
Sleep is known to elicit off-line improvements of newly learned procedural skills, a phenomenon attributed to enhancement consolidation of an internal skill representation. In the motor domain, enhancement consolidation has been reported almost exclusively for sequential-finger-tapping skills. The aim of the present study was to extend the notion of(More)
The finite mass method is a gridless Lagrangian method to simulate compressible flows that has been introduced in a recent paper from Gauger, Leinen, and Yserentant [SIAM J. Numer. Anal., 37 (2000), pp. 1768–1799]. It is based on a discretization of mass, not of space as with classical discretization schemes. Mass is subdivided into little mass packets of(More)
The purpose of this study was to determine the extent to which participants could effectively switch from on-line (OL) to pre-planned (PP) control (or vice versa) depending on previous practice conditions and whether concurrent visual feedback was available during transfer testing. The task was to reproduce a 2000 ms spatial-temporal pattern of a sequence(More)
The experiment was conducted to determine the influence of mirror movements in bimanual coordination during life span. Children, young adults, and older adults were instructed to perform a continuous 1:2 bimanual coordination task by performing flexion-extension wrist movements over 30s where symmetrical and non-symmetrical coordination patterns alternate(More)