Microstructural effects become important at regions of stress concentrators such as notches, cracks and contact surfaces. A multiscale model is presented that efficiently captures microstructural details at such critical regions. The approach is based on a multiresolution mesh that includes an explicit microstructure representation at critical regions where stresses are localized. At regions fa...

The choice of local HARDI reconstruction technique is crucial for discerning multiple fiber orientations, which is itself of substantial importance for tractography, and reliable and accurate assessment of white matter fiber geometry. Due to the complexity of the diffusion process and its milieu, distinct diffusion compartments can have different frequency signatures, making the HARDI signal sp...

Alzheimer's disease (AD) involves a gradual breakdown of brain connectivity, and network analyses offer a promising new approach to track and understand disease progression. Even so, our ability to detect degenerative changes in brain networks depends on the methods used. Here we compared several tractography and feature extraction methods to see which ones gave best diagnostic classification f...

For the calculation of load or residual stresses from measured strain data by means of x-rays or neutrons, the so called x-ray elastic constants are required. Usually they are calculated from the corresponding single crystal data assuming some models such as Voigt, Reuss or Kröner. In this paper, the finite element method is used to guarantee both, stress equilibrium and strain compatibility ac...

Cold-rolled sheet metal that is often used in laser forming exhibits anisotropic properties, which are mostly caused by preferred orientations of grains developed during the severe plastic deformation such as cold rolling. In the present study, the textures of cold-rolled mild steel sheets are characterized and the influence of the plastic anisotropy on laser forming process is investigated. De...

In this article, we develop a new method to segment Q-Ball imaging (QBI) data. We first estimate the orientation distribution function (ODF) using a fast and robust spherical harmonic (SH) method. Then, we use a region-based statistical surface evolution on this image of ODFs to efficiently find coherent white matter fiber bundles. We show that our method is appropriate to propagate through reg...

Diffusion magnetic resonance imaging is widely used to investigate diffusion patterns of water molecules in the human brain. It provides information that is useful for tracing axonal bundles and inferring brain connectivity. Diffusion axonal tracing, namely tractography, relies on local directional information provided by the orientation distribution functions (ODFs) estimated at each voxel. To...

Diffusion imaging is a variant of magnetic resonance imaging (MRI) that can noninvasively map the nerve fiber tracts of the human brain.1 Because fibrous tissue restricts the constant heat motion (i.e., diffusion) of water molecules in a characteristic way, diffusionmeasurements provide data about the position and orientation of major nerve fiber bundles. Nerve fiber paths reconstructed from di...

The ability of bovine follicular fluid (FF) and oviduct fluid (ODF) to capacitate sperm was determined. At concentrations of greater than 20%, both FF and ODF capacitated sperm within 4 hours, but at concentrations greater than 40%, FF also initiated the acrosome reaction. Non-luteal ODF at a concentration greater than 60% capacitated sperm within 2 hours. Non-luteal ODF maintained sperm motili...

The influences of cold rolling and subsequent heat treatment on the microstructure evolution 2524 alloy were investigated using an orientation distribution function (ODF) electron back-scattered diffraction (EBSD). A preparation method 2524-T3 aluminum with a strong Brass texture was developed, its effect fatigue properties scanning microscopy (SEM) transmission (TEM). results show that increas...