Short title: Centered random walks Abstract: we extend the Carne-Varopoulos upper bound on the probability transitions of a Markov chain to a certain class of non-reversible processes by introducing the definition of a ‘centering measure’. In the case of random walks on a group, we study the connections between different notions of centering.

PURPOSE One difficulty with Descemet's stripping automated endothelial keratoplasty (DSAEK) is air management during surgery and donor endothelial lamella centering. We evaluated the no-touch technique for donor centering and the use of a newly developed DSAEK donor adjuster. METHODS We evaluated the records of 12 consecutive patients (mean age 75.3 years) with bullous keratopathy who had und...

Centrosome positioning is actively regulated by forces acting on microtubules radiating from the centrosomes. Two mechanisms, center-directed and polarized cortical pulling, are major contributors to the successive centering and posteriorly displacing migrations of the centrosomes in single-cell-stage Caenorhabditis elegans. In this study, we analyze the spatial distribution of the forces actin...

INTRODUCTION Transportation is an important iatrogenic endodontic error which might cause failure. This study evaluated the canal transportation caused by Neoniti and ProTaper instruments, using cone-beam computed tomography (CBCT) cross sections. METHODS AND MATERIALS This in vitro experimental study was performed on 40 mesiobuccal roots of maxillary first molars. The teeth were scanned with...

This work is concerned with the development and validation of two accurate, precise and specific spectrophotometric and chromatographic methods for analysis of Phenylepherine (PE), Lidocaine (LC) and Thiomersal (TM) in their ternary mixture and in Chromoderm® solution. The developed spectrophotometric method is the mean centering of ratio spectra (MCR) spectrophotometric method that depends on ...

In a number of manufacturing applications, parts of circular cross-section must be centered for optimal processing or measurement. However, part form is never perfect, making accurate determination of the “centered” state of a part difficult. Imperfect inputs to the manufacturing process such as roughprocessed parts, deformation due to heat treatment, or raw formed materials present difficulty ...

This chapter explores the correlation between centering and different forms of pronominal reference in Italian, in particular zeros and overt pronouns in subject position. In previous work (Di Eugenio, 1990), I proposed that such alternation could be explained in terms of centering transitions. In this chapter, I verify those hypotheses by means of a small corpus of naturally occurring data. In...

Centering theory posits a discourse center, a distinguished discourse entity that is the topic of a discourse. A simplified version of this theory is developed in a Dynamic Semantics framework. In the resulting system, the mechanism of center shift allows a simple, elegant analysis of a variety of phenomena involving sloppy identity in ellipsis and “paycheck pronouns”.