this paper proposes a triangulation method for a digitized surface whose points are located on a regular lattice. the method relies on an iterative and adaptive splitting of triangular faces of an initial polyhedral surface. assuming a bijection between the digitized surface and its approximation, a partition of the data base is performed. the method allows the measurement of the local quality ...

[1] Shear wave splitting is a robust tool to infer the direction and strength of seismic anisotropy in the lithosphere and underlying asthenosphere. Previous shear wave splitting studies in the Afar Depression and adjacent areas concluded that either Precambrian sutures or vertical magmatic dikes are mostly responsible for the observed anisotropy. Here we report results of a systematic analysis...

We study UV spectra obtained with the SO82-B slit spectrograph on board SKYLAB to estimate the fine structure splitting of the Cl-like 3p3d D5/2 and 3p 3d D7/2 levels of Fe X. The splitting is of interest because the Zeeman effect mixes these levels, producing a “magnetically induced transition” (MIT) from 3p3d D7/2 to 3p 5 P3/2 for modest magnetic field strengths characteristic of the active s...

BACKGROUND The resection of large oropharyngeal tumors traditionally involves a lip-splitting mandibulotomy for adequate margin visualization and free flap reconstruction of the surgical defect. Transoral robotic surgery (TORS) has emerged as a technique that can resect large and complex oropharyngeal tumors, avoiding a lip-splitting approach. The aim of this study is to compare the lip-splitti...

Ruth Heller, Paul R. Rosenbaum and Dylan S. Small University of Pennsylvania, Philadelphia Abstract. An observational or nonrandomized study of treatment e¤ects may be biased by failure to control for some relevant covariate that was not measured. The design of an observational study is known to strongly a¤ect its sensitivity to biases from covariates that were not observed. For instance, the c...

We present a method to grid-enable tandem mass spectrometry protein identification. The implemented parallelization strategy embeds the open-source x!tandem tool in a grid-enabled workflow. This allows rapid analysis of large-scale mass spectrometry experiments on existing heterogeneous hardware. We have explored different data-splitting schemes, considering both splitting spectra datasets and ...

For the time integration of stii transport-chemistry problems from air pollution modelling, standard ODE solvers are not feasible due to the large number of species and the 3D nature. The popular alternative, standard operator splitting, introduces artiicial transients for short-lived species. This complicates the chemistry solution, easily causing large errors for such species. In the framewor...

This paper examines the errors introduced by operator splitting techniques in air quality models. Results are presented for different time steps used in the splitting schemes as well as for different ordering in which the operators are computed. Furthermore, a non-splitting technique is developed to analyze the performance of operator splitting techniques in air quality models. Convergence rate...