Search results

Filter

Filetype

Your search for "*" yielded 541099 hits

Decay spectroscopy of Os 171,172 and Ir 171,172,174

We report on a study of the α-decay fine structure and the associated Eα-Eγ correlations in the decays of Os171,172 and Ir171,172,174. In total, 13 new α-decay energy lines have been resolved, and three new γ-ray transitions have been observed following the new decay branches to Re168 and W167. The weak α-decay branch from the bandhead of the νi13/2 band in Os171 observed in this work highlights a

Incidence and concomitant chondral injuries in a consecutive cohort of primary traumatic patellar dislocations examined with sub-acute MRI

Purpose: To present age- and sex-specific cumulative annual incidences of primary traumatic lateral patellar dislocation (LPD) and to detail patient characteristics and concomitant chondral injuries including osteochondral fractures, as visualized on magnetic resonance imaging (MRI), in a large consecutive cohort of knee-injured individuals. Methods: Data on primary traumatic lateral patellar disl

Banal placemaking : spatial conceptions in an Icelandic provincial newspaper in the 1880s

Drawing theoretic inspiration from the spatial turn within humanities, this article attempts to develop methods for studying placemaking in news media. This is done by a case study of the newspaper Þjóðviljinn, published in Ísafjörður, Iceland, in the late nineteenth century. The concept ‘banal placemaking’ is suggested for the kinds of spatial conceptions that occur in the paper without the expli

European integration in context: Questioning the normative foundations of European criminal law

With this special issue and as part of the ELJ's endeavour to foster collaborative research projects on European integration, two of its board members, Jacob Öberg and Valsamis Mitsilegas, threw down a challenge to fellow expertsin European criminal law: to reflect on the normative foundations of European criminal law. This challenge first tookshape with an online symposium organised by Jacob with

Long Term Results of a Randomised Trial of Stenting of the Superficial Femoral Artery for Intermittent Claudication

Objective: Primary stenting of the superficial femoral artery (SFA) in intermittent claudication (IC) has been shown to increase health related quality of life (HRQoL) after 12 and 24 months. An extended follow up of HRQoL 36 and 60 months after randomisation is presented. Methods: A multicentre randomised controlled trial was conducted at seven vascular clinics in Sweden between 2010 and 2020. On

Eigenvalue analysis and longtime stability of resonant structures for the meshless radial point interpolation method in time domain

A meshless collocation method based on radial basis function (RBF) interpolation is presented for the numerical solution of Maxwell's equations. RBFs have attractive properties such as theoretical exponential convergence for increasingly dense node distributions. Although the primary interest resides in the time domain, an eigenvalue solver is used in this paper to investigate convergence properti

Complex dispersion relation calculations with the symmetric interior penalty method

A high-order discontinuous Galerkin method for calculations of complex dispersion relations of two-dimensional photonic crystals is presented. The medium is characterized by a complex-valued permittivity and we relate for this absorptive system the spectral parameter to the time frequency. We transform the non-linear eigenvalue problem for a Lorentz material in air into a non-Hermitian linear eige

On the spectrum of a holomorphic operator-valued function with applications to absorptive photonic crystals

We study electromagnetic wave propagation in a periodic and frequency dependent material characterized by a space- and frequency-dependent complex-valued permittivity. The spectral parameter relates to the time-frequency, leading to spectral analysis of a holomorphic operator-valued function. We apply the Floquet transform and show for a fixed quasi-momentum that the resulting family of spectral p

On a method to reduce uncertainties in bulk property measurements of two-component composites

For two-component composites, we address the inverse problem of estimating the structural parameters and decrease measurement errors in bulk property measurements. A measurement of the effective permittivity at one frequency gives microstructural information about the composite that is used in cross-property bounds to estimate the effective permittivity at other frequencies. We use this informatio

Meshless eigenvalue analysis for resonant structures based on the radial point interpolation method

Meshless methods are a promising field of numerical methods recently introduced to computational electromagnetics. The potential of conformal and multi-scale modeling and the possibility of dynamic grid refinements are very attractive features that appear more naturally in meshless methods than in classical methods. The Radial Point Interpolation Method (RPIM) uses radial basis functions for the a

On the spectrum of an operator pencil with applications to wave propagation in periodic and frequency dependent materials

We study wave propagation in periodic and frequency dependent materials when the medium in a frequency interval is characterized by a real-valued permittivity. The spectral parameter relates to the quasi momentum, which leads to spectral analysis of a quadratic operator pencil where frequency is a parameter. We show that the underlying operator has a discrete spectrum, where the eigenvalues are sy

Computations of lossy Bloch waves In two-dimensional photonic crystals

In this article we compute lossy Bloch waves in two-dimensional photonic crystals with dispersion and material loss. For given frequencies these waves are determined from non-linear eigenvalue problems in the wave vector. We applied two numerical methods to a demanding test case, a photonic crystal with embedded quantum dots that exhibits very strong and anamolous dispersion. The first method is b

Inverse bounds of two-component composites

A method is presented for estimating microstructural parameters from permittivity measurements of two-component composites. This structural information is described by a particular positive measure in the Stieltjes integral representation of the effective permittivity. The dependence on the geometrical structure can be reduced to the problem of calculating the moments of the measure. We present a

Inverse bounds and bulk properties of complex-valued two-component composites

The bulk properties of composites are known to depend strongly on the microstructure. This dependence can be quantified in terms of a representation introduced by D. Bergman, which factorizes the geometry dependence from the contrast. Based on this analytic representation of the effective permittivity, we present a general scheme to estimate the microstructural parameters such as the volume fracti

Bounds on effective anisotropic material parameters

A new method to estimate the micro-structural parameters of anisotropic two-phase composite material is derived. The parameters are estimated using information from measurements or from numerical experiments. The method is used to derive new bounds on the effective tensor that incorporates information from measurements of a related parameter. These new bounds are called cross-property bounds.

Bounds on the effective tensor and the structural parameters for anisotropic two-phase composite material

This paper is concerned with the estimation of macroscopic properties such as the permittivity or the thermal conductivity of a composite material from the microstructure. A new method of estimating the microstructural parameters, such as the volume fraction of anisotropic two-phase composite material, is derived. The parameters are estimated using information from measurements of the random mater