نتایج جستجو برای: vertical spectrum

تعداد نتایج: 315953  

2003
Jon D. Pelletier Donald L. Turcotte

We present power spectra of time-series data for tree ring width chronologies, atmospheric temperatures, river discharges and precipitation averaged over hundreds of stations worldwide. The average power spectrum S for each of these phenomena is found to have a power-law dependence on frequency with exponent -l/2: S(f) xf-‘/‘. An advection-diffusion model of the vertical transport of heat and w...

2013
Hongqi Zhang

We compute magnetic helicity and energy spectra of the solar active region NOAA 11158 during 11–15 February 2011 at 20 southern heliographic latitude using observational photospheric vector magnetograms. We adopt the isotropic representation of the Fourier-transformed two-point correlation tensor of the magnetic field. The sign of magnetic helicity turns out to be predominantly positive at all ...

Journal: :journal of algebra and related topics 2013
f. farshadifar

let $r$ be a commutative ring and let $m$ be an $r$-module. in this article, we introduce the concept of the zariski socles of submodules of $m$ and investigate their properties. also we study modules with noetherian second spectrum and obtain some related results.

Journal: :algebraic structures and their applications 2015
ali zeydi abdian s. morteza mirafzal

a multicone graph is defined to be join of a clique and a regular graph. a graph $ g $ is  cospectral with  graph $ h $ if their adjacency matrices have the same eigenvalues. a graph $ g $ is  said to be  determined by its spectrum or ds for short, if for any graph $ h $ with $ spec(g)=spec(h)$, we conclude that $ g $ is isomorphic to $ h $. in this paper, we present new classes of  multicone g...

Journal: :فیزیک زمین و فضا 0
مجید معهود گروه ژئوفیزیک، دانشگاه آزاد اسلامی واحد علوم و تحقیقات تهران نفیسه اکبرزاده گروه ژئوفیزیک، دانشگاه آزاد اسلامی واحد علوم و تحقیقات، تهران حسین حمزه لو پژوهشگاه بین المللی زلزله شناسی و مهندسی زلزله، تهران

on 11th of august 2012 the region was surprisingly struck by a shallow mw 6.4 (usgs) earthquake with pure right-lateral strike-slip character only about 50 km north of the north-tabriz fault. an east-west striking surface rupture of about 20 km length was observed in the field by geological survey of iran. only 11 minutes later and about 6 km further nw a second shallow event with mw 6.2 occurr...

2011
T. Tsuda X. Lin H. Hayashi

GPS radio occultation (RO) is characterized by high accuracy and excellent height resolution, which has great advantages in analyzing atmospheric structures including small-scale vertical fluctuations. The vertical resolution of the geometrical optics (GO) method in the stratosphere is about 1.5 km due to Fresnel radius limitations, but full spectrum inversion (FSI) can provide superior resolut...

2008
Ekram Hossain Long Le Natasha Devroye Mai Vu

1.1 Introduction Under utilization of radio spectrum in traditional wireless communications systems [30], along with the increasing spectrum demand from emerging wireless applications, is driving the development of new spectrum allocation policies for wireless communications. These new spectrum allocation policies, which will allow unlicensed users (i.e., secondary users) to access the radio sp...

Journal: :Journal of neurology, neurosurgery, and psychiatry 1988
M F Mehler

The term "ocular bobbing" defines a distinctive class of abnormal spontaneous vertical eye movements which occur in a variety of clinicopathological settings. Four cardinal forms, which correspond to the predicted permutations of the two characteristic clinical variables, initial vertical excursion and phasic velocity, have now been described. Reverse ocular dipping, with directional reversal a...

Journal: :Applied optics 1997
D C Hovde C A Parsons

A vertical cavity surface-emitting laser was studied for gas-sensing applications. Properties of the 962-nm laser that were measured include side-mode suppression, wavelength tuning with temperature and current, power versus injection current, and the amplitude noise spectrum. With wavelength modulation spectroscopy, a rms noise level of 2 x 10(-4) absorbance units was achieved. The large curre...

2007
M. Jacquemet N. Picqué G. Guelachvili A. Garnache I. Sagnes M. Strassner C. Symonds

A room temperature operating Vertical External Cavity Surface Emitting Laser is applied around 1550 nm to intracavity laser absorption spectroscopy analyzed by timeresolved Fourier transform interferometry. At an equivalent pathlength of 15 km, the high resolution spectrum of the semiconductor disk laser emission covers 17 nm simultaneously. A noise equivalent absorption coefficient at one seco...

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