Introduction: Retropharyngeal space schwannomas are rare entities. About 20-45% of schwannomas occur in the head and neck region; however, they represent less than 1% of all head and neck tumors.  Case Report: We present the case of a 36-year-old woman complaining of dysphagia caused by a large schwannoma arising in the posterior pharyngeal wall with remarkable reduction of the oropharyngeal sp...

conclusion safety-related parameters of posterolateral and posterior approaches in supine thoracentesis are far better than that of the conventional lateral approach. background in patients who have difficulty sitting, thoracentesis is attempted in a supine position via lateral approach. recently, a new table has been designed for supine thoracentesis. this table has gaps that allow access to t...

the endurance of any type of architecture is contingent upon the study of the characteristics that led to its formation. two general approaches have been adopted to study and analyze the iranian architecture. a number of scholars have taken a historical approach, while others have merely considered a genre- based approach. making use of many historical studies, these scholars have attempted to ...

the objective of the present study was to estimate heritability values for some performance and egg quality traits of native fowl in isfahan breeding center using reml and bayesian approaches. the records were about 51521 and 975 for performance and egg quality traits, respectively. at the first step, variance components were estimated for body weight at hatch (bw0), body weight at 8 weeks of a...

Contents 1 Introduction 1 2 Basic theoretical concepts 5 2.1 Hubbard model and dynamical mean-field theory. .

This paper considers the stability problem of linear delay-differential systems of neutral type. A discretized Lyapunov functional approach is developed. The resulting stability criteria are formulated in the form of a linear matrix inequality. For nominal systems, the analytical results can be approached with fine discretization. For uncertain systems, the new approach is much less conservativ...

This paper investigates price uncertainties in weather derivatives contracts through a bootstrap approach. Futures prices are computed under a periodic ARMA model in an actuarial framework for two different locations, Paris and Chicago. We show that statistical errors may lead to substantial uncertainties on futures prices with confidence intervals up to 10% of the assessed prices.

In anticipation of the explosive growth of digital libraries, a complex study was undertaken seeking to evaluate 21 diverse services at 5 major academic research libraries. This work stands as a model for evaluation of digital libraries, through its focus on both the costs of operations and the impacts of the services that those operations provide. The data have been analyzed using both statist...