in the current research, wind energy potential at yazd synoptic stations, which contain wind data with 10 years statistic period and beyond, including yazd synoptic station (1976-2006), tabass (1987-2006), robate poshte badam (1992-2006), bafgh (1993-2006) and marvast (1997-2006), has been studied. wind data were obtained from the recorded data at yazd meteorology organization. the data were re...

The object of this paper is to give a short and reasonably self-contained treatment of the distribution properties of the rational points on the sphere S = {x ∈ R;x1 + x2 + x3 = 1} using only basic properties of modular forms, including the Shimura lift and the fundamental work of Rankin. Consider the set R of rational points Q ∩ S. By the height h(x) of a point x ∈ R we shall mean simply the l...

BACKGROUND AND AIMS Plants in open, uncrowded habitats typically have relatively short stems with many branches, whereas plants in crowded habitats grow taller and more slender at the expense of mechanical stability. There seems to be a trade-off between height growth and mechanical stability, and this study addresses how stand density influences stem extension and consequently plant safety mar...

INTRODUCTION The aim of the present study was to evaluate how vertical facial height correlates with mandibular plane angle, facial width and depth from a three dimensional (3D) viewing angle. METHODS In this study 3D cephalometric landmarks were identified and measurements from 43 randomly selected cone beam computed tomography (CBCT) images of dry skulls from the Weisbach collection of Vien...

this study aims at analyzing spatial pattern and associations of fagus oriantalis lipsky in different vertical classes in intact beech forests. data collection was done in 25 ha plot in gorazbon district of educational and experimental forests of university of tehran. species and dbh of all trees with dbh > 7.5 cm were recorded. the location of each tree was determined using azimuth and distanc...

In this paper, a method to evaluate queries in document databases is proposed. The main idea of this method is a new top-down algorithm for tree-inclusion. In fact, a path-oriented query can be considered as a pattern tree while an XML document can be considered as a target tree. To evaluate a query S against a document T, we will check whether S is included in T. For a query S, our algorithm n...

Height restricted resolution (proofs or refutations) is a natural restriction of resolution where the height of the corresponding proof tree is bounded. Height restricted resolution does not distinguish between treeand sequence-like proofs. We show that polylogarithmic-height resolution is strongly connected to the bounded arithmetic theory S 2(α). We separate polylogarithmic-height resolution ...