نتایج جستجو برای: angular spectrum
تعداد نتایج: 293796 فیلتر نتایج به سال:
We present the formula for angular distribution of integral flux of conventional (π, K) muons deep under water taking into account the sphericity of the atmosphere and fluctuations of muon energy losses. The accuracy of this formula for various sea level muon spectra is discussed. The possibility of reconstructing two parameters of sea level spectrum by fitting measured underwater angular inten...
The hadronic decays of heavy quark-antiquark 13S1 resonances such as the $/J or T can provide an ideal laboratory for studying the properties of gluon jets. We discuss the predictions of QCD perturbation theory for gluon jet structures, hadronic multiplicities, fragmentation distributions, and angular distributions. In particular the channel (Qa) y + X, whose rate, spectrum, and angular distrib...
سیستم های طیف گسترده(spread spectrum) امروزه به طور وسیعی مورد استفاده قرار می گیرند. این سیستم ها ابتدا توسط ارتش آمریکا و در طی جنگ جهانی دوم مورد استفاده قرار گرفت. در سیستم های طیف گسترده دنباله خطی (direct sequence spread spectrum) سیگنال داده در یک دنباله شبه نویز ضرب می شود تا پهنای باند افزایش یابد. در گیرنده نیز سیگنال دریافتی پس از دمدولاسیون در یک دنباله شبه نویز همانند دنباله موجود ...
Submitted for the MAR14 Meeting of The American Physical Society Persistent Currents in Bosonic Mixtures in the Ring Geometry1 ZHIGANG WU, EUGENE ZAREMBA, Queen’s University, Canada — We investigate the possibility of bosonic mixtures supporting persistent currents in the ring geometry. Our analysis is based on an approach developed by F. Bloch which focuses on the ground state energy of the co...
PURPOSE Diffusion Spectrum Imaging enables to reconstruct the ensemble average propagator (EAP) at the expense of having to acquire a large number of measurements. Compressive sensing offers an efficient way to decrease the required number of measurements. The purpose of this work is to perform a thorough experimental comparison of three sampling strategies and six sparsifying transforms to sho...
This paper presents observations of Cygnus A at 74 and 327 MHz at angular resolutions of approximately 10 and 3, respectively. These observations are among the highest angular resolutions obtained below 1000 MHz for this object. While the angular resolution at 74 MHz is not sufficient to separate clearly the hot spots from the lobes, guided by 151 and 327 MHz images, we have estimated the 74 MH...
The CMB is perhaps the cleanest cosmological observable. Given a cosmology model, the angular spectrum of the CMB can be computed to percent accuracy. On the observational side, as far as we know, there is little that stands in the way between an accurate measurement and a rigorous confrontation with theory. In this article, we review the state of the data and indicate future directions. The da...
Extraction of the CMB (Cosmic Microwave Background) angular power spectrum is a challenging task for current and future CMB experiments due to the large data sets involved. Here we describe an implementation of MASTER (Monte carlo Apodised Spherical Transform EstimatoR) described in Hivon et al. (2002) which exploits the destriping technique as a mapmaking method. In this method a noise estimat...
We present measurements of the angular power spectrum of millimeter wave anisotropies with the APEX-SZ instrument. APEX-SZ has mapped 0.8 square degrees of sky at a frequency of 150 GHz with an angular resolution of 1′. These new measurements significantly improve the constraints on anisotropy power at 150 GHz over the range of angular multipoles 3000 < ` < 10, 000, limiting the total astronomi...
We compute classical gravitational bremsstrahlung from the gravitational scattering of two massless particles at leading order in the (center of mass) deflection angle θ ∼ 4G √ s/b = 8GE/b ≪ 1. The calculation, although non-perturbative in the gravitational constant, is surprisingly simple and yields explicit formulae –in terms of multidimensional integrals– for the frequency and angular distri...
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