نتایج جستجو برای: Vertical spectrum

تعداد نتایج: 315953  

Journal: :IEICE Transactions 2012
Behtash Babadi Vahid Tarokh

In this paper, we study the problem of distributed spectrum allocation under a vertical spectrum sharing scenario in a cognitive radio network. The secondary users share the spectrum licensed to the primary user by observing the activity statistics of the primary users, and regulate their transmission strategy in order to abide by the spectrum sharing etiquette. When the primary user is inactiv...

Journal: :journal of the structural engineering and geotechnics 0
maryam firoozi nezamabadi department of civil engineering, south tehran branch, islamic azad university, tehran, iran fariborz yaghoobi vayeghan department of civil engineering, pardis branch, islamic azad university, pardis, iran

field observations of the incurred damages to the buildings and bridges due to earthquakes in near field show there are various failure modes which are in relation to the forces caused by vertical component. while vertical component of earthquake for ordinary buildings in most seismic regulations and standards is not considered. therefore, in the current study the effects of vertical and horizo...

Fariborz Yaghoobi Vayeghan Maryam Firoozi Nezamabadi

Field observations of the incurred damages to the buildings and bridges due to earthquakes in near field show there are various failure modes which are in relation to the forces caused by vertical component. While vertical component of earthquake for ordinary buildings in most seismic regulations and standards is not considered. Therefore, in the current study the effects of vertical and horizo...

2005
Y.-H. Chu

Beam broadening effects on the Doppler radar spectrum induced by alongand cross-radar-beam winds are theoretically investigated in this article. Analytical expression of beam broadening spectrum for a vertical beam subject to a constant vertical wind in the absence of horizontal wind is derived first. We find that the resultant beam broadening spectral shape is in an exponential form, rather th...

Journal: :journal of structural engineering and geo-techniques 2015
maryam firoozi nezamabadi fariborz yaghoobi vayeghan

field observations of the incurred damages to the buildings and bridges due to earthquakes in near field show there are various failure modes which are in relation to the forces caused by vertical component. while vertical component of earthquake for ordinary buildings in most seismic regulations and standards is not considered. therefore, in the current study the effects of vertical and horizo...

Recently, concerning failure of structures due to earthquakes, special investigations of near fault ground motions have been noticed. Hence, in this paper, characteristics of near field ground motions have been considered in horizontal and vertical directions. In this consideration, the record averages have been compared with Uniform Building Code and Eurocode8 spectra in two levels. In additio...

Journal: :The Journal of chemical physics 2005
Weijun Zheng Shoujun Xu Dunja Radisic Sarah Stokes Xiang Li Kit H Bowen

Betaine is a permanent zwitterion. The molecular betaine anion has been generated in a hybrid, infrared desorption-electron photoemission source and its photoelectron spectrum recorded. The photoelectron spectrum of the betaine anion is characteristic of a dipole bound anion, and its vertical detachment energy was measured to be 0.29+/-0.03 eV. Calculations by Rak, Skurski, and Gutowski [J. Che...

Journal: :فیزیک زمین و فضا 0
اکو علیپور دانشجوی کارشناسی ارشد ژئومغناطیس-دانشگاه شاهرود محمد حسن محمدیان دانشجوی کارشناسی ارشد ژئومغناطیس- دانشگاه شاهرود حمید آقاجانی استادیار، دانشکدۀ معدن، نفت و ژئوفیزیک، دانشگاه صنعتی شاهرود، ایران

determination of boundary surface structures is commonly used for data interpretation. horizontal and vertical derivatives are useful tool for determining the edges boundary. using horizontal and vertical derivative in signal analysis method; that is effective method for interpretation of edges boundary, have been used commercially.in acquisition potential field data, using different methods of...

حاجی علی, ابراهیم, ضیایی, فرهود, عباسی دوانی, فریدون,

In this research, the vertical Bridgman method has used to perform the single crystal growth of cesium iodide alkali halide. To this purpose, a vertical cylindrical furnace equipped with electric elements with five different thermal regions has been designed and constructed. The temperature gradient of the furnace can be controlled up to 1000○C with 0.1○C accuracy. Several cesium iodide sample ...

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