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Showing 1 to 20 of 26 for “"Spectral distribution"”.
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Convergence Rates of Spectral Distribution of Random Inner Product Kernel Matrices
… authors have proved that the limiting empirical spectral distribution (ESD) of such matrices A converges to the Marchenko- Pastur distribution. Here, we establish the corresponding rate of convergence. The strategy is as follows. First, we show that for z = u + iv ∈ C, v > 0, the distance between …
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Topological characteristics of IP networks
… The optimisation is performed using the weighted spectral distribution metric, which simultaneously takes into account many the properties of a graph. In order to understand the dynamics of the Internet, I study the evolution of the AS topology over a period of seven years. To understand the …
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Theoretical and experimental assessment of the optical response of planar microlens arrays
… source based on system parameters and spectral distribution of the input source. The necessary elements of optical theory and equations required for the derivation of the field of view parameters and broadband resolution are presented, including all the assumptions and constraints that …
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The U center in potassium bromide crystals
… that is, an interstitial hydride ion. The spectral distribution of quantum efficiency for conversion of U centers to negative ion vacancies at 78°K was measured and found to decrease by 4~ on the high energy side of the U band. The U band has a high energy shoulder and it is suggested that …
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Probabilistic and Analytic Methods in Combinatorics
… answers a longstanding question regarding the spectral distribution of a matrix where each entry is 1 with probability d/n. In particular, this result gives the first spectral distribution for nonhermitian random matrices at this level of sparsity and answers a question that was highlighted by …
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Measurement of the spectra of multiply-scattered radiation in a medium irradiated with Co60 gamma rays
A knowledge of the spectral distribution of scattered radiation at a point is of value in planning effective radiation therapy and adequate personnel protection. Some spectra have been calculated theoretically or measured experimentally for a few particular irradiation conditions. In this …
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The measurement of the output spectrum of a cobalt 60 teletherapy unit
… of this spectrum was not practicable. The spectral distribution of single scattered radiation from this beam, at each of a number of scattering angles, was therefore measured. This scattered spectrum was then converted to the output spectrum by the application of the appropriate scattering …
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Design and Evaluation of an Active Yaw and Turbulence Generation System to Produce Unsteady Flow in Automotive Wind Tunnels
… flow behavior, the shape of the yaw angle distribution, and spectral distribution of velocity fluctuations. It is shown that the active yaw subsystem can generate bespoke yaw angle distributions. For example, the generated flows can mirror a variety of on-road flow conditions including the …
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Raman Spectroscopy Of Glasseswith High And Broad Raman Gain In The Boson Peak Region
… allowing to compare signal strength and spectral coverage. We also investigate the relationship between glass structure and the Boson peak (enhancement of the low-frequency vibrational density of states) and report new inelastic neutron scattering spectra for niobium-phosphate glasses. …
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Distributional modelling in forestry and remote sensing
The use of distributional models in forestry is investigated, in terms of their capability of modelling distributions of forest mensurational attributes, for modelling and inventory purposes. Emphasis is put on: (i) the univariate and bivariate modelling of tree diameters and heights for …
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Observations from a Long Duration X-Ray Source for Laboratory Astrophysics
… The gated grating spectrometer records the spectral distribution of the broadband x-ray flux over a photon energy interval of almost 2 keV; this spectral information is important for understanding the experiment driven by the x-ray flux, it shows the thermalization of the x-ray field in the …
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Sonoluminescence for the quantitative analysis of alkali and alkaline earth chlorides
… as alkali and alkaline earth metals, they emit spectral lines characteristic of their lowest energy neutral excited states. By measuring the intensity and spectral distribution of this radiation, these species may be identified and quantified over a wide range of concentrations. Data is …
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Three-dimensional metallic architectures for photonic and energy storage applications
… in solar energy harvesting due to the broad spectral distribution of energies emitted by the sun. Single junction photovoltaic (PV) cells efficiently convert solar radiation to electricity in a narrowed range of energies concentrated around the energy of the PV cell electronic band gap. A …
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Surface reflection model estimation from naturally illuminated image sequences
… light sources with positions and radiance distributions that are precisely controlled. Natural illumination presents a complex hemispherical light source which changes in both spatial and spectral distribution with time, terrestrial location, and atmospheric conditions. An image-based …
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High Gain / Broadband Oxide Glasses For Next Generation Raman Amplifiers
… this application due to their relatively broad spectral response, and ability of making them into optical fiber. This dissertation summarizes findings on different oxide-based glasses that have been synthesized and characterized for their potential application as Raman gain media. Two main glass …
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On Gaussian Multiplicative Chaos
… when suitably normalised, converge in distribution to multiplicative chaos on the support of the limiting spectral distribution as the size of the matrix goes to infinity, and the limit is independent of the choice of the potential function. This is part of an ongoing programme of …
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In Vivo Dosimetry Using Plastic Scintillation Detectors For External Beam Radiation Therapy
… °C increase relative to 22 °C, respectively. The spectral distribution of light was observed to change with temperature as well. This resulted in a non-negligible error in measured dose at human body temperature, requiring a temperature-specific correction factor.</p> <p>Next, PSDs were used for …
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Overexpression of human Cu/Zn Superoxide Dismutase in Mice; The Effect of Increase Superoxide Scavenging on Autonomic Control of the Heart.
… low-frequency power component of the HRV power spectral distribution (C57: 1.19 ± 0.11, SOD1: 0.35 ± 0.06, P < 0.001). This study shows that although hSOD1 overexpression does not affect overall baroreflex function, it does potentiate baroreceptor sensitivity and brain stem control of arterial …
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The dynamics of the outer region of wall-bounded turbulence : La dinámica de la zona exterior en la turbulencia de pared
… terms of the additional Reynolds stresses. The spectral distribution of energy in this layer is dominated by the wavenumber of the velocity disturbances and by its harmonics. Outside of it, only the largest scales of the flow are modified by the wall forcing. They are the global modes identified …
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