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Numrering	Referens	Omslagsbild	Hitta
1.	Rudolph, Dirk, et al. (författare) Nuclear Structure Notes on Element 115 Decay Chains 2015 Ingår i: AIP Conference Proceedings. - : AIP Publishing LLC. - 0094-243X. - 9780735413283 ; 1681 Konferensbidrag (refereegranskat)abstract Hitherto collected data on more than hundred α-decay chains stemming from element 115 are combined to probe some aspects of the underlying nuclear structure of the heaviest atomic nuclei yet created in the laboratory.
2.	Abgrall, N., et al. (författare) The large enriched germanium experiment for neutrinoless double beta decay (LEGEND) 2017 Ingår i: AIP Conference Proceedings. - : Author(s). - 1551-7616 .- 0094-243X. ; 1894 Konferensbidrag (refereegranskat)abstract The observation of neutrinoless double-beta decay (0νββ) would show that lepton number is violated, reveal that neu-trinos are Majorana particles, and provide information on neutrino mass. A discovery-capable experiment covering the inverted ordering region, with effective Majorana neutrino masses of 15 - 50 meV, will require a tonne-scale experiment with excellent energy resolution and extremely low backgrounds, at the level of ∼0.1 count /(FWHM·t·yr) in the region of the signal. The current generation 76Ge experiments GERDA and the Majorana Demonstrator, utilizing high purity Germanium detectors with an intrinsic energy resolution of 0.12%, have achieved the lowest backgrounds by over an order of magnitude in the 0νββ signal region of all 0νββ experiments. Building on this success, the LEGEND collaboration has been formed to pursue a tonne-scale 76Ge experiment. The collaboration aims to develop a phased 0νββ experimental program with discovery potential at a half-life approaching or at 1028 years, using existing resources as appropriate to expedite physics results.
3.	Abrikosov, Alexei I., et al. (författare) Multiscale study of crystal and electronic structure of Al defects in concrete 2018 Ingår i: International Conference of Computational Methods in Sciences and Engineering 2018, ICCMSE 2018. - : Author(s). - 9780735417663 ; 2040 Konferensbidrag (refereegranskat)abstract Possible crystal structures of aluminium defects in concrete materials are tested with reactive force filed ReaxFF. The ongoing project includes further refinement of the structures by semiempirical and ab initio methods.
4.	Almqvist, Andreas, et al. (författare) Flow in thin domains with a microstructure : Lubrication and thin porous media 2017 Ingår i: AIP Conference Proceedings. - : AIP Publishing. - 0094-243X .- 1551-7616. ; 1798 Tidskriftsartikel (refereegranskat)abstract This paper is devoted to homogenization of different models of flow in thin domains with a microstructure. The focus is on applications connected to the effect of surface roughness in full film lubrication, but a parallel to flow in thin porous media is also discussed. Mathematical models of such flows naturally include two small parameters. One is connected to the fluid film thickness and the other to the microstructure. The corresponding asymptotic analysis is a delicate problem, since the result depends on how fast the two small parameters tend to zero relative to each other. We give a review of the current status in this area and point out some future challenges.
5.	Andreasson, Eskil, et al. (författare) Simulation of thin aluminium-foil in the packaging industry 2017 Ingår i: AIP Conference Proceedings. - : American Institute of Physics Inc.. - 0094-243X. - 9780735415805 Konferensbidrag (refereegranskat)abstract This work present an approach of how to account for the anisotropic mechanical material behaviour in the simulation models of the thin aluminium foil layer (≈10 μm) used in the Packaging Industry. Furthermore, the experimental results from uniaxial tensile tests are parameterised into an analytical expression and the slope of the hardening subsequently extended way beyond the experimental data points. This in order to accommodate the locally high stresses present in the experiments at the neck formation. An analytical expression, denominated Ramberg-Osgood, is used to describe the non-linear mechanical behaviour. Moreover it is possible with a direct method to translate the experimental uniaxial tensile test results into useful numerical material model parameters in Abaqus™. In addition to this the extended material behaviour including the plastic flow i.e. hardening, valid after onset of localisation, the described procedure can also capture the microscopic events, i.e. geometrical thinning, ongoing in the deformation of the aluminium foil. This method has earlier successfully been applied by Petri Mäkelä for paperboard material [1]. The engineering sound and parameterised description of the mechanical material behaviour facilitates an efficient categorisation of different aluminium foil alloys and aid the identification of the correct anisotropic (RD/TD/45°) mechanical material behaviour derived from the physical testing. © 2017 Author(s).
6.	Asadzadeh, Mohammad, 1952, et al. (författare) Finite element schemes for Fermi equation 2017 Ingår i: International Conference of Numerical Analysis and Applied Mathematics 2016, ICNAAM 2016, Rhodes, Greece, 19-25 September 2016. AIP Conference Proceedings. Vol. 1863, nr. 1, 370007. - : Author(s). - 0094-243X .- 1551-7616. - 9780735415386 Konferensbidrag (refereegranskat)abstract A priori error estimates are derived for the streamline diffusion (SD) finite element methods for the Fermi pencil-beam equation. Two-dimensional numerical examples confirm our theoretical investigations.
7.	Azad, A. K., et al. (författare) Crystallographic and Magnetic Properties of the Spinel-type Ferrites ZnxCo1-xFe2O4 (0.0 2015 Ingår i: AIP Conference Proceedings. - : AIP Publishing LLC. - 1551-7616 .- 0094-243X. - 9780735413047 ; 1660 Konferensbidrag (refereegranskat)abstract Ultrahigh frequencies (UHF) have applications in signal and power electronics to minimize product sizes, increase production quantity and lower manufacturing cost. In the UHF range of 300 MHz to 3 GHz, ferrimagnetic iron oxides (ferrites) are especially useful because they combine the properties of a magnetic material with that of an electrical insulator. Ferrites have much higher electrical resistivity than metallic ferromagnetic materials, resulting in minimization of the eddy current losses, and total penetration of the electromagnetic (EM) field. Hence ferrites are frequently applied as circuit elements, magnetic storage media like read/write heads, phase shifters and Faraday rotators. The electromagnetic properties of ferrites are affected by operating conditions such as field strength, temperature and frequency. The spinel system ZnxCo1-xFe2O4 (x= 0.0, 0.25, 0.50 and 0.75) has been prepared by the standard solid state sintering method. X-ray and neutron powder diffraction measurements were performed at room temperature. Neutron diffraction data analysis confirms the cubic symmetry corresponding to the space group Fd3m. The distribution of three cations Zn2+, Co2+ and Fe3+ over the spinel lattice and other crystallographic parameters like lattice constant, oxygen position parameter, overall temperature factor and occupancies of different ions in different lattice sites for the samples have been determined from the analysis of neutron diffraction data. The lattice constant increases with increasing Zn content in the system. The magnetic structure was found to be ferrimagnetic for the samples with x
8.	Beilina, Larisa, 1970, et al. (författare) Adaptive finite element method in nanophotonic simulations 2017 Ingår i: International Conference of Numerical Analysis and Applied Mathematics 2016, ICNAAM 2016, Rhodes, Greece, 19-25 September 2016. Vol. 1863, nr. 1, 370004. - : Author(s). - 0094-243X .- 1551-7616. - 9780735415386 Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract The problem of constructing nanophotonic structures of arbitrary geometry with prescribed properties was studied using an adaptive optimization algorithm. Stability estimates for the forward and adjoint problems involved in this algorithm are presented. A numerical example illustrates the construction of nanostructure in two dimensions.
9.	Beilina, Larisa, 1970, et al. (författare) Preface for the session "recent Progress in Electromagnetic Field Theory and New Trends in Inverse Problems" 2017 Ingår i: AIP Conference Proceedings. - : Author(s). - 0094-243X .- 1551-7616. ; 1863 Konferensbidrag (övrigt vetenskapligt/konstnärligt)
10.	Beilina, Larisa, 1970 (författare) Quantitative imaging technique using the layer-stripping algorithm 2017 Ingår i: International Conference of Numerical Analysis and Applied Mathematics 2016, ICNAAM 2016, Rhodes, Greece, 19-25 September 2016. AIP Conference Proceedings. Vol. 1863, nr 1, 370008. - : Author(s). - 0094-243X .- 1551-7616. - 9780735415386 Konferensbidrag (refereegranskat)abstract We present the layer-stripping algorithm for the solution of the hyperbolic coefficient inverse problem (CIP). Our numerical examples show quantitative reconstruction of small tumor-like inclusions in two-dimensions.
11.	Benlliure, J., et al. (författare) New experimental approaches to investigate the fission dynamics 2016 Ingår i: AIP Conference Proceedings. - : Author(s). - 1551-7616 .- 0094-243X. - 9780735414112 ; 1753 Konferensbidrag (refereegranskat)abstract The first ever achieved full identification of both fission fragments, in atomic and mass number, made it possible to define new observables sensitive to the fission dynamics along the fission path up to the scission point. Moreover, proton-induced fission of 208Pb at high energies offers optimal conditions for the investigation of dissipative, and transient effects, because of the high-excitation energy of the fissioning nuclei, its low angular momentum, and limited shape distortion by the reaction. In this work we show that the charge distribution of the final fission fragments can constrain the ground-to-saddle dynamics while the mass distribution is sensitive to the dynamics until the scission point.
12.	Berdnikov, Yury, et al. (författare) Broadening of length distributions of Au-catalyzed InAs nanowires 2016 Ingår i: State-of-the-Art Trends of Scientific Research of Artificial and Natural Nanoobjects, STRANN 2016: Proceedings of the 5th International Conference "State-of-the-Art Trends of Scientific Research of Artificial and Natural Nanoobjects". - : Author(s). - 9780735414051 ; 1748 Konferensbidrag (refereegranskat)abstract We investigate kinetic broadening effects on the length distributions of gold-catalyzed InAs nanowires having different diameters. It is shown that the length distributions acquire bimodal shape when the longest nanowires exceed the diffusion length of indium adatoms on the nanowire sidewalls. Later on, the length distributions recover unimodal shapes. We develop a theoretical model that is capable of describing the observed behaviors by accounting for the diffusion-induced character of the vapor-liquid-solid growth.
13.	Bijnens, Johan (författare) Status of chiral meson physics 2016 Ingår i: XIth Conference on Quark Confinement and Hadron Spectrum. - : AIP Publishing LLC. - 9780735413481 ; 1701 Konferensbidrag (refereegranskat)abstract This talk includes a short introduction to Chiral Perturbation Theory in the meson sector concentrating on a number of recent developments. I discuss the latest fit of the low-energy constants. Finite volume corrections are discussed for the case with twisted boundary conditions for form-factors and first results at two-loops for three flavours for masses. The last part discusses the extension to other symmetry breaking patterns relevant for technicolour and related theories as well as the calculation of leading logarithms to high loop orders.
14.	Bin Asad, S M Sayeed, 1985-, et al. (författare) Experimental study of the flow past submerged half-cylinders 2017 Ingår i: AIP Conference Proceedings. - : American Institute of Physics (AIP). - 0094-243X .- 1551-7616. ; 1851 Tidskriftsartikel (refereegranskat)abstract This investigation studies the details of the flow behind and over two identical semicircular cylinderspositioned in tandem. Laser Doppler Velocimetry (LDV) measurements are carried out in a laboratory waterflume using two different gap ratios (Sp/d = 1 and Sp/d = 0.5; where Sp indicates distance between the cylindersand d indicates cylinder diameter) under two different flow situations. These LDV measurement are used toderive velocities, formation length and Power spectral density for the various flow conditions. Flowvisualizations are also added in this investigation. The results indicate that the flow is significantly affected dueto gap ratios.
15.	Bjurström, Henrik, et al. (författare) Effect of surface unevenness on non-contact surface wave measurements using a rolling microphone array 2015 Ingår i: 41ST ANNUAL REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION. - : American Institute of Physics (AIP). - 9780735412927 ; , s. 128-135 Konferensbidrag (refereegranskat)abstract Surface wave velocity is measured and evaluated along a straight survey line in order to compare two different data acquisition methods. Results from a rolling microphone array are compared to data acquired using a conventional accelerometer. Results from the two different data acquisition methods are shown to be similar. However, it is demonstrated that the results are very sensitive to misalignments between the microphone array and the measured surface. Practices to overcome problems with misalignments are discussed and demonstrated.
16.	Bolaño, Iria, et al. (författare) Pyridine-cyanoanthracene bonded exciplex 2019 Ingår i: Proceedings of the International Conference of Computational Methods in Sciences and Engineering 2019, ICCMSE 2019. - : AIP Publishing. - 0094-243X .- 1551-7616. - 9780735419339 ; 2186 Konferensbidrag (refereegranskat)abstract Exiplexes are a special kind of molecular complexes, which exist only due to a weak bond in an excited state. The theoretical description of these complexes requires the usage of multiconfigurational theory (CASSCF or RASSCF) followed by second order of perturbation theory. Formation of exiplex complex from pyridine and cyano-anthracene has been studied.
17.	Bondestam Malmberg, John, 1988, et al. (författare) Iterative regularization and adaptivity for an electromagnetic coefficient inverse problem 2017 Ingår i: AIP Conference Proceedings. 1863, nr. 370002. - : Author(s). - 0094-243X .- 1551-7616. - 9780735415386 Konferensbidrag (refereegranskat)abstract We study how the choice of the regularization parameter affects the quality of the reconstruction of the dielectric permittivity for an inhomogeneous medium, with data consisting of boundary observations of the electric field. Our method is based on the minimization of a Tikhonov functional and uses a finite element method for computations of the electric field. We conclude that the choice of the regularization parameter does not affect the quality of the reconstruction significantly in the studied cases, and can even be removed with results not significantly different from those with regularization.
18.	Bonora, Nicola, et al. (författare) Validating material modelling for OFHC copper using Dynamic Tensile Extrusion (DTE) test at different velocity impact 2017 Ingår i: AIP Conference Proceedings. - : Author(s). - 1551-7616 .- 0094-243X. ; 1793, s. 100019- Konferensbidrag (refereegranskat)abstract In the Dynamic Tensile Extrusion (DTE) test, the material is subjected to very large strain, high strain rate and elevated temperature. Numerical simulation, validated comparing with measurements obtained on soft-recovered extruded fragments, can be used to probe material response under such extreme conditions and to assess constitutive models. In this work, the results of a parametric investigation on the simulation of DTE test of annealed OFHC copper -at impact velocity ranging from 350 up to 420 m/s -using the modified Rusinek-Klepaczko model, are presented. Simulation of microstructure evolution was performed using the visco-plastic self consistent model (VPSC), providing, as input, the velocity gradient history obtained with FEM at selected locations along the axis of the fragment trapped in the extrusion die. Finally, results are compared with EBSD analysis.
19.	Borodulin, V. I., et al. (författare) Characteristics of 3D instability of a 35-degree swept wing to CF and TS modes. Experiment and theory 2016 Ingår i: AIP Conference Proceedings. - : American Institute of Physics (AIP). - 0094-243X. - 9780735414280 Konferensbidrag (refereegranskat)abstract An extensive experimental investigation of linear evolution of Cross-Flow (CF) and Tollmien-Schlichting (TS) modes of 3D boundary layer oscillations on a swept wing has been carried out. TS-instability characteristics have been studied experimentally for the first time. The characteristics of development of the two kinds of instability modes are compared with calculations and display a very good agreement. The whole dataset may be used for promotion of theoretical methods of investigation of laminar-turbulent transition in swept wing boundary layers.
20.	Borodulin, V. I., et al. (författare) Excitation of 3D TS-waves in a swept-wing boundary layer by surface vibrations and freestream vortices 2018 Ingår i: AIP Conference Proceedings. - : American Institute of Physics Inc.. - 0094-243X. - 9780735417472 Konferensbidrag (refereegranskat)abstract There are several kinds of velocity disturbances, which may affect the transition to turbulence in a swept wing boundary layer. Tollmien-Schlichting (TS) waves are among most important of them. The properties of TS waves and their potential competition with cross-flow waves on a swept wing are poorly studied in theoretical works and were not studied experimentally at all. This paper presents the method of excitation of fully controlled 3D TS waves via interaction of free-stream vortices and surface vibrations. The experimental approach developed here will be used for investigation of the corresponding receptivity problem.
21.	Borodulin, V. I., et al. (författare) Laminar-turbulent transition delay on a swept wing 2016 Ingår i: AIP Conference Proceedings. - : American Institute of Physics (AIP). - 0094-243X. - 9780735414280 Konferensbidrag (refereegranskat)abstract The paper describes the results of experiments on robustness of laminar-turbulent transition control on a swept-wing using distributed micro-sized roughness (DMSR) elements. These elements introduce controlled stationary vortices which are able to significantly modify the base flow and its stability characteristics. We have performed parametric study first varying height and period of the DMSR elements in order to find the most stabilizing effect on boundary later flow in compare to uncontrolled reference case without DMSR. Significant downstream shift of laminar-turbulent transition position due to application of DMSR is found and well documented with help of thermography. The robustness of this flow control method was studied by variation of the wind-tunnel flow quality introducing significant sound background or introducing enhanced turbulence level (applying turbulizing grids). The wind-tunnel tests performed with turbulence-generating grids (at enhanced turbulence levels) have shown that laminar-turbulent transition moves upstream in this case, while DMSR-elements loose their effectiveness for transition control (no matter in quiet sound conditions or at elevated sound background). The experiments on acoustic influence have shown that without DMSR acoustic does not effect transition location. However, in case then laminar-turbulent transition is delayed by presence of DMSR, an additional transition delay was observed when harmonic acoustic waves of certain frequency were excited.
22.	Bulanov, S. S., et al. (författare) Depletion of intense fields 2017 Ingår i: AIP Conference Proceedings. - : Author(s). - 1551-7616 .- 0094-243X. - 9780735414808 ; 1812:1, s. Article no. UNSP 100006 - Konferensbidrag (refereegranskat)abstract The problem of backreaction of quantum processes on the properties of the background field still remains on the list of outstanding questions of high intensity particle physics. Usually, photon emission by an electron or positron, photon decay into electron-positron pairs in strong electromagnetic fields, or electron-positron pair production by such fields are described in the framework of the external field approximation. It is assumed that the external field has infinite energy and is not affected by these processes. However, the above-mentioned processes have a multi-photon nature, i.e., they occur with the absorption of a significant number of field photons. As a result, the interaction of an intense electromagnetic field with either a highly charged electron bunch or a fast growing population of electrons, positrons, and gamma photons (as in the case of an electromagnetic cascade) may lead to a depletion of the field energy, thus making the external field approximation invalid. Taking the multi-photon Compton process as an example, we estimate the threshold of depletion and find it to become significant at field strengths (a0∼103) and electron bunch charge of about tens of nC. © 2017 Author(s).
23.	Burtseva, Evgeniya, 1988-, et al. (författare) Potential type operators in PDEs and their applications 2017 Ingår i: AIP Conference Proceedings. - : AIP Publishing. - 0094-243X .- 1551-7616. ; 1798 Tidskriftsartikel (refereegranskat)abstract We prove the boundedness of Potential operator in weighted generalized Morrey space in terms of Matuszewska-Orlicz indices of weights and apply this result to the Hemholtz equation in r3 with a free term in such a space. We also give a short overview of some typical situations when Potential type operators arise when solving PDEs.
24.	Canhanga, Betuel, 1980-, et al. (författare) Numerical Methods on European Options Second Order Asymptotic Expansions for Multiscale Stochastic Volatility 2017 Ingår i: INCPAA 2016 Proceedings. - : Author(s). - 9780735414648 ; , s. 020035-1-020035-10 Konferensbidrag (refereegranskat)abstract After Black-Scholes proposed a model for pricing European Option in 1973, Cox, Ross and Rubinstein in 1979, and Heston in 1993, showed that the constant volatility assumption in the Black-Scholes model was one of the main reasons for the model to be unable to capture some market details. Instead of constant volatilities, they introduced non-constant volatilities to the asset dynamic modeling. In 2009, Christoffersen empirically showed "why multi-factor stochastic volatility models work so well". Four years later, Chiarella and Ziveyi solved the model proposed by Christoffersen. They considered an underlying asset whose price is governed by two factor stochastic volatilities of mean reversion type. Applying Fourier transforms, Laplace transforms and the method of characteristics they presented an approximate formula for pricing American option.The huge calculation involved in the Chiarella and Ziveyi approach motivated us to investigate another approach to compute European option prices on a Christoffersen type model. Using the first and second order asymptotic expansion method we presented a closed form solution for European option, and provided experimental and numerical studies on investigating the accuracy of the approximation formulae given by the first order asymptotic expansion. In the present chapter we will perform experimental and numerical studies for the second order asymptotic expansion and compare the obtained results with results presented by Chiarella and Ziveyi.
25.	Chipiga, Larisa, et al. (författare) Assessment of patient doses and corresponding radiation risks from PET/CT examinations in the Russian Federation 2019 Ingår i: 5th International Conference on X-Ray, Electrovacuum and Biomedical Technique. - : Author(s). - 9780735418196 ; 2089 Konferensbidrag (refereegranskat)abstract In the current study we evaluated the structure of positron emission tomography combined with computed tomography (PET/CT) diagnostics in the Russian Federation. Patient effective doses, organ doses and corresponding radiation risks for the most common PET/CT examinations were evaluated. Data was collected in 12 regions of the Russian Federation in the period 2012-2017 in 19 facilities (26 PET/CT scanners, corresponding to more than 60 % of the scanners in the country). Typical administered activities and DLP values for the CT protocols were estimated with the subsequent calculation of typical organ and effective doses from external and internal exposure. Lifetime radiation detriment-adjusted risks were calculated based on both the effective dose and organ absorbed doses considering the gender of the patient. The results of the dose survey indicate that the most common PET/CT examinations are whole body and brain examinations with 18F-FDG (performed in 26 and 8 surveyed departments respectively). Other PET/CT examinations are significantly less common. The highest patient doses were calculated for whole body PET/CT examinations - about 20 mSv. The doses increase up to 35-40 mSv if multiphase CT scan was performed, the CT scan composed up to 70-90 % of the total effective dose. Lifetime detriment-adjusted risk was estimated for PET/CT examinations of the brain as 2·10 -4 ; for pelvic as 5·10 -4 , and may reach up to 10 -3 for whole body PET/CT examinations. Comparison of risks assessed by two approaches indicated that the simplified risk assessment based on effective dose overestimated the risk for PET/CT examinations of the brain (both genders) and for whole body and pelvic examinations (males only). Overall, differences in male and female patients can reach up to the 30 %.
26.	Christoph, Richter, et al. (författare) Identification of optimum molten salts for use as heat transfer fluids in parabolic trough CSP plants. A techno-economic comparative optimization 2017 Ingår i: AIP Conference Proceedings. - : American Institute of Physics (AIP). - 0094-243X .- 1551-7616. - 9780735417571 Tidskriftsartikel (refereegranskat)abstract Parabolic trough power plants using thermal oil as heat transfer fluid are the most mature concentrating solar power technology and state of the art. To further increase their efficiency and lower costs, molten salts can be used as heat transfer fluid. This results in higher operating temperature differences for improved cycle efficiencies and enables direct thermal energy storage at lower costs due to omission of the oil-to-salt heat exchanger and the need for smaller storage sizes. As a variety of salts are available to choose from, this study uses a multi-objective optimization to identify the most suitable heat transfer fluid for three locations in South Africa, Spain and Chile. The lowest values for the levelized costs of electricity (LCOE) can be found in Chile using Solar Salt as heat transfer fluid (75.0 $/MWhe). Generally, Solar Salt offers the lowest LCOE values followed by thermal oil and Hitec. The results also suggest that the choice of the heat transfer fluid is dependent on the direct normal irradiance (DNI) at each location. Thermal oil is competitive with Solar Salt in small systems at locations with low DNI values, whereas Hitec can be cheaper than thermal oil in large systems at locations with high DNI. Furthermore, it is also investigated at which freeze alert temperature set point the activation of the freeze protection system is optimal. The results indicate that this temperature should be chosen close to the solar field inlet temperature for small systems, while it can be lowered significantly for large systems to reduce electricity consumption from the freeze protection system.
27.	Cohen, David, 1977- (författare) Numerical discretisations of stochastic wave equations 2018 Ingår i: International conference of numerical analysis and applied mathematics (ICNAAM 2017). - : American Institute of Physics (AIP). - 9780735416901 ; 1978:1, s. 1-5 Konferensbidrag (refereegranskat)abstract This extended abstract starts with a brief introduction to stochastic partial differential equations with a particular focus on stochastic wave equations. Various numerical experiments for this stochastic partial differential equation are presented. Finally, we point out results from the literature on the numerical analysis of stochastic wave equations.
28.	Collotta, M., et al. (författare) Preface of the "symposium on Advanced Engineering Systems and Computer Applications : Theory and Practice" 2016 Ingår i: AIP Conference Proceedings. - : Author(s). - 0094-243X .- 1551-7616. ; 1790 Tidskriftsartikel (refereegranskat)
29.	Desjardins, Kewin, et al. (författare) Characterization of a back-illuminated CMOS camera for soft x-ray coherent scattering 2019 Ingår i: Proceedings of the 13th International Conference on Synchrotron Radiation Instrumentation, SRI 2018. - : Author(s). - 9780735417823 ; 2054 Konferensbidrag (refereegranskat)abstract A commercial scientific camera has been adapted and characterized at the SOLEIL Synchrotron with the aim to improve the acquisition capabilities on the soft X-ray coherent scattering experimental station at SEXTANTS beamline. This device is equipped by the last generation of back side illuminated scientific CMOS (BSI-sCMOS) of 2048 by 2048 pixels of 11 μm2 able to acquire low noise images with a frame rate up to 48 Hz. The camera's performance measurements have been done and shows a good level of readout noise, a large full-well capacity, a medium dark current and a good homogeneity, respectively, 1.6 e- rms (in High Gain mode), 80 000 e- (in Low Gain mode),<5 e-/pixel/s and ∼ 1%. The quantum efficiency (QE) measurement has been performed at the soft x-ray branch of the METROLOGIE beamline and gives a relatively good agreement with the expected theoretical values. Finally, the demonstration of the camera's efficiency and of the gain in useful time measurement related to the high frame rate have been performed with a series of Airy patterns images compared with an image recorded using the standard BSI-CDD already in operation at the SEXTANTS beamline.
30.	Dhumal, Jyoti, et al. (författare) Citrate capped Fe0.7Mn0.3Fe2O4 ferrite nanoparticles for hyperthermia 2018 Ingår i: AIP Conference Proceedings. - : American Institute of Physics (AIP). - 0094-243X. - 9780735417052 Konferensbidrag (refereegranskat)abstract Structural, magnetic properties and alternating current (AC) magnetic heating characteristics of Fe0.7Mn0.3Fe2O4 nanoparticles have been investigated with respect to the possible application for magnetic hyperthermia. The specific absorption rate (SAR) was measured in alternating magnetic fields of 84.44–251.4Oe at fixed frequency of 289 kHz. Fe-Mn NPs were fabricated by the chemical co-precipitation method using sodium hydroxide as the precipitating agent and citric acid as capping agent. The morphology of the particles was analyzed by transmission electron microscopy (TEM). The TEM reveals that the grains are nearly spherical in shape with average particles size of 10nm. X-ray diffraction pattern indicated the sole existence of cubic spinel phase of Fe-Mn NPs with lattice parameter a=8.3419 Å. Formation of the spinel Fe-Mn ferrite was also supported by Fourier Transform Infrared Spectroscopy. The saturation magnetization (Ms) is 40emu/g with superparamagnetic nature of the sample. The magnetic heating ability of NPs was studied with an induction heating system. A highest SAR value of 78.85W/g for 2mg/mL sample concentration (289 kHz, 335.2Oe) was observed.
31.	Engström, Christopher, 1987-, et al. (författare) Calculating PageRank in a changing network with added or removed edges 2017 Ingår i: AIP Conference Proceedings, Volume 1798. - : American Institute of Physics (AIP). - 9780735414648 ; , s. 020052-1-020052-8 Konferensbidrag (refereegranskat)abstract PageRank was initially developed by S. Brinn and L. Page in 1998 to rank homepages on the Internet using the stationary distribution of a Markov chain created using the web graph. Due to the large size of the web graph and many other real worldnetworks fast methods to calculate PageRank is needed and even if the original way of calculating PageRank using a Power iterations is rather fast, many other approaches have been made to improve the speed further. In this paper we will consider the problem of recalculating PageRank of a changing network where the PageRank of a previous version of the network is known. In particular we will consider the special case of adding or removing edges to a single vertex in the graph or graph component
32.	Eriksson, Mikael (författare) The multi-bend achromat storage rings 2016 Ingår i: Proceedings of the 12th International Conference on Synchrotron Radiation Instrumentation, SRI 2015. - : Author(s). - 9780735413986 ; 1741 Konferensbidrag (refereegranskat)abstract Not very long ago, the 3rd generation storage ring technology was judged as mature. Most of the 3rd generation storage rings used the Double-Bend Achromat (DBA) or Triple-Bend Achromat (TBA) concepts. It was however a well-known fact that increasing the number of magnet cells in the rings is a powerful way of decreasing the electron beam emittance and thus the source brilliance, but at the penalty of increasing the size and cost of the rings. Preserving the Dynamic Aperture (DA) in the rings became also an issue when increasing the number of magnet cells. The Multi-Bend Achromat (MBA) concept, including a miniaturization of the ring elements, has now drastically changed the picture. The MBA rings, now in construction or being planned, offer orders of magnitudes higher brilliance than rings of conventional designs. Several light sources around the world are now implementing or planning to implement this MBA concept. This article touches on the science drivers for higher brilliance. We will then describe the MBA concept with its advantages as well as its challenges. A short survey of the MBA activity around the world will also be presented. The author apologies for focusing on the MAX IV project regarding technical solutions. This is motivated by that MAX IV is the facility he knows best and it might be regarded as a fore-runner for the MBA concept.
33.	Fahlander, Claes (författare) Engaging local industry in the development of basic research infrastructure and instrumentation - The case of HIE-ISOLDE and ESS Scandinavia 2016 Ingår i: Latin American Symposium on Nuclear Physics and Applications, LASNPA 2015. - : Author(s). - 9780735414112 ; 1753 Konferensbidrag (refereegranskat)abstract Two world-class research facilities, the European Spallation Source, ESS, and the light-source facility MAX-IV, are being built in southern Sweden. They will primarily, when completed, be used for research in the fields of material sciences, life sciences, medicine and pharmacology. Their construction and the operation and maintenance of them for many years will create new business opportunities for companies in Europe in general and in Sweden, Denmark and Norway in particular in many different sectors. A project, CATE, Cluster for Accelerator Technology, was set up with the aim to strengthen the skills of companies in the Öresund-Kattegat-Skagerrak region in Scandinavia in the field of accelerator technology such that they will become competitive and be able to take advantage of the potential of these two research facilities. CATE was strategically important and has helped to create partnerships between companies and new business opportunities in the region.
34.	Fahlander, Mirka (författare) Dissemination of research results from Lund University to industry and society 2016 Ingår i: Latin American Symposium on Nuclear Physics and Applications, LASNPA 2015. - : Author(s). - 9780735414112 ; 1753 Konferensbidrag (refereegranskat)abstract Sweden is top ranked as the third most innovative nation in the world according to Global Innovation Index 2015. The academic staff at Swedish universities has the right to their inventions (research-ownership of patent rights) as opposed to far more diffuse university-ownership. Since 1977 the Swedish Higher Education Act imposes Swedish universities a so-called Third task. In addition to education and research they shall collaborate with the society and to inform the society about their activities. How does the largest university in Scandinavia deal with dissemination of research results to industry and society? The presentation will touch upon technology transfer, professional education and regional development as well as commercialization of research results.
35.	Forsgren, Christer, 1955 (författare) Recycling experiences from Scandinavia, focus on ash from waste incineration and plastics 2019 Ingår i: AIP Conference Proceedings. - : AIP Publishing. - 1551-7616 .- 0094-243X. ; 2124 Konferensbidrag (refereegranskat)abstract Ash from waste incineration generated when cleaning flue gases contain about 40 w% of water soluble salts, most containing heavy metals like Pb. A method to use the acid scrubber liquid from the air pollution control system to neutralize the alkaline ash has been developed and a full scale demonstration plant is presently being built in Copenhagen, Denmark. The project has partly been financed by EU LIFE. The plant includes steps for metal recycling, mainly Cu and Zn, and removal of chlorides from the washed solid fraction that could be used for construction purposes. Stena Recycling International finance a Professorship in Industrial Material Recycling at Chalmers Technical University in Gothenburg Sweden since more than 10 years back, where most of the research in this area takes place. Not all thermoplastic waste fractions are clean enough to be mechanically recycled. Feed stock recycling, substitutional fuel and energy recovery are possible alternatives that have been evaluated and tested in Europe. Halogens are in general the biggest challenge since they produce corrosive acids when decomposing due to increased temperature. In a more Circular Economy materials are material recycled more often than today. No sorting equipment is 100 % correct why low concentrations of contaminants will be able to detect in many recycled materials. Bio test is one efficient method to prove that even though contaminants can be detected the bio availability could be very low. Gene response monitoring has successfully been applied.
36.	Garrido, Jorge, et al. (författare) Characterization of a Stirling cavity receiver performance in the KTH high-flux solar simulator and comparison with real Dish-Stirling data 2018 Ingår i: AIP Conference Proceedings. - : American Institute of Physics Inc.. - 0094-243X. - 9780735417571 Konferensbidrag (refereegranskat)abstract This paper presents the experimental results of the Cleanergy's C11S solar engine-generator tested in the KTH solar simulator. The paper focuses on the analysis of the thermal performance of the cavity receiver used in the C11S module. Multiple temperature measurements were taken on the tubes of the receiver, inside the cavity and on the internal surface of the cavity. These values allowed characterizing the temperature distribution all around the cavity receiver for the validation of thermal models and the estimation of the thermal losses. Moreover, this paper shows a comparison of the operating characteristics of the C11S module under the real operating conditions and the laboratory ones. It was observed that the temperatures of the receiver in the High Flux Solar Simulator (HFSS) resemble well the real temperatures. Thereby, the KTH solar lab provides proper irradiance levels to operate solar receivers at representative working conditions.
37.	Gaska, Karolina, 1986, et al. (författare) Evidence of percolated network at the linear - Nonlinear transition in oscillatory shear 2019 Ingår i: AIP Conference Proceedings. - : Author(s). - 1551-7616 .- 0094-243X. ; 2107 Konferensbidrag (refereegranskat)abstract In this publication we review evidence for the detection of a percolated network in polymer nanocomposites at the linear - nonlinear transition in oscillatory shear tests. Two types of nanocomposites based on branched polymers as matrix are compared: a low density polyethylene (LDPE) and graphite nanoplatelets (GnP) as filler and a poly(ethylene- butyl acrylate) (EBA) containing graphite nanoplatelets and carbon black (CB). Oscillatory shear tests were analyzed in the framework of Fourier-transform rheology and Tschebyshev polynomial decomposition. For both nanocomposites, in the vicinity of the electrical percolation threshold, i.e. the formation of a continuous filler network, a distinct region is evidence at the transition linear - nonlinear transition in the strain dependent third relative higher harmonics of the shear stress Fourier spectra. The region can be characterized by different strain amplitude dependence that could be related to the specific filler morphologies, however, further investigations are required to assess the factors that influence the linear - nonlinear transition region in polymer nanocomposites.
38.	Gaska, Karolina, 1986, et al. (författare) Highly structured graphene polyethylene nanocomposites 2019 Ingår i: AIP Conference Proceedings. - : Author(s). - 1551-7616 .- 0094-243X. ; 2065 Konferensbidrag (refereegranskat)abstract This research presents an overview of the properties of highly structured, low density polyethylene-graphene nanoplatelets (LDPE-GnP). The influence of nanofiller content, size and processing conditions on the material properties have been investigated. Therefore, rheological and thermal nanocomposite properties were investigated. So-called dry-coating method has been used in order to prepare masterbatches which were thereafter extruded by means of single screw extruder resulting in a strong anisotropy in the extruded samples. Graphene nanoplatelets were oriented in the extrusion direction for all shear rates and flow histories investigated, as confirmed by scanning electron microscopy. The rheological percolation was determined via nonlinear parameters to be around 11wt%. Thermal conductivity measurements revealed strong anisotropy with in-plane conductivity increasing with GnP content.
39.	Gazda, Daniel, 1983, et al. (författare) Quantifying uncertainties in nuclear matrix elements for dark matter searches 2019 Ingår i: AIP Conference Proceedings. - : AIP Publishing. - 1551-7616 .- 0094-243X. ; 2165 Konferensbidrag (refereegranskat)abstract In this contribution we report on quantification of theoretical uncertainties in nuclear matrix elements relevant for modeling dark matter and electro-weak interactions with nuclei. Recently we have developed a novel ab initio framework for computations of nuclear matrix elements and applied it in calculations of reaction rates for dark matter particles scattering off selected nuclear targets [1]. To evaluate the nuclear matrix elements we used nuclear wave functions computed within an ab initio many-body framework employing state-of-the-art nuclear Hamiltonians derived from chiral effective field theory. For the first time we have quantified the nuclear-physics uncertainties of the matrix elements that result from the remaining freedom in the construction of realistic nuclear interactions and their impact on physical observables. We found significant uncertainties especially for certain spin-dependent nuclear matrix elements. While our nuclear structure calculations have been performed with the no-core shell model method and applied in the context of dark matter searches, the approach can be generalized to other ab initio methods and extended to other sectors.
40.	Geskin, V., et al. (författare) Bianthrone at a Metal Surface: Conductance Switching with a Bistable Molecule Made Feasible by Image Charge Effects 2015 Ingår i: AIP Conference Proceedings. - : AIP Publishing LLC. - 1551-7616 .- 0094-243X. ; 1642, s. 469-472 Konferensbidrag (refereegranskat)abstract Bianthrone is a sterically hindered compound that exists in the form of two non-planar isomers. Our experimental study of single-molecule junctions with bianthrone reveals persistent switching of electric conductance at low temperatures, which can be reasonably associated to molecular isomerization events. Temperature dependence of the switching rate allows for an estimate of the activation energy of the process, on the order of 35-90 meV. Quantum-chemical calculations of the potential surface of neutral bianthrone and its anion, including identification of transition states, yields the isolated molecule isomerization barriers too high vs. the previous estimate, though in perfect agreement with previous experimental studies in solution. Nevertheless, we show that the attraction of the anion in the vicinity of the metal surface by its image charge can significantly alter the energetic landscape, in particular, by reducing the barrier to the values compatible with the observed switching behavior.
41.	Ghassemali, Ehsan, et al. (författare) Microstructure versus substructure size effect 2016 Ingår i: AIP Conference Proceedings. - : American Institute of Physics (AIP). - 0094-243X. - 9780735414273 ; , s. 1-6 Konferensbidrag (refereegranskat)abstract In metal deformation, size effect is generally attributed to the interactive effect of grain size and specimen dimension. This work shows, however, that relative substructure dimensions should also be considered. Micro-compression tests on the micro-pins having different grain sizes revealed no significant size effect with respect to the mechanical behavior, even if the number of grains over the diameter of the micro-pins falls below its critical value. To justify the reason laying under this fact, a recovery annealing cycle was applied on the micro-pins to change the substructure properties without altering the mean grain size. A surprising drop in the flow stress of the recovery-annealed micro-pins implied the importance of considering subgrain size rather than grain size over the diameter of component for the size effect investigation.
42.	Gleim, Tobias, et al. (författare) Experimental and Numerical Aspects of a Thermal Fluid-Structure Phenomenon 2017 Ingår i: International Conference of Numerical Analysis and Applied Mathematics (ICNAAM 2016). - : Author(s). - 0094-243X .- 1551-7616. - 9780735415386 ; 1863 Konferensbidrag (refereegranskat)abstract A fundamental research experiment for thermal fluid-structure-interaction for the verification of a partitioned approach with non-linear material properties is examined. In the following, a specimen is heated as well as cooled within a wind tunnel. The thermal fluid-structure-interaction is first experimentally investigated and subsequently numerically validated. For the numerical simulation, two existing programs (a fluid and a structure code) are coupled using a partitioned approach.
43.	Gleim, Tobias, et al. (författare) Thermal Fluid-Structure-Interaction - Experimental and Numerical Analysis 2015 Ingår i: Proceedings of the International Conference of Numerical Analysis and Applied Mathematics 2014 (ICNAAM-2014). - : AIP Publishing LLC. - 0094-243X .- 1551-7616. ; 1648 Konferensbidrag (refereegranskat)abstract In the present paper the thermal fluid-structure-interaction is experimentally and numerically investigated. Therefore, the interaction phenomena is modeled by the Reynolds-averaged Navier-Stokes equations and the nonlinear Fourier heat conduction equation are used for the fluid and the solid phase, respectively. The simulation is performed using a partitioned approach using the finite volume method for the fluid domain, the finite element method for the solid domain and Runge-Kutta integration schemes for the time domain. Furthermore, as a basis for the understanding of thermal fluid-structure-interaction and also for the veri cation and validation of the applied continuum mechanical models and numerical methods, respectively, a fundamental wind tunnel experiment is presented.
44.	Griesmayer, E., et al. (författare) Applications of single-crystal CVD diamond XBPM detectors with nanometre x-ray beams 2019 Ingår i: Proceedings of the 13th International Conference on Synchrotron Radiation Instrumentation, SRI 2018. - : Author(s). - 9780735417823 ; 2054 Konferensbidrag (refereegranskat)abstract Measurements with a Diamond XBPM were carried out at the MAX IV Laboratory, Lund, Sweden, at the NanoMAX beam line. This was the first investigation of a Diamond XBPM detector with nanometre beams. The effect of diffusion, as well as the position resolution at the smallest available beam sizes were studied.
45.	Guariglia, Emanuel, 1982-, et al. (författare) A functional equation for the Riemann zeta fractional derivative 2017 Ingår i: Proceedings of INCPAA 2016, 11th International Conference on Mathematical Problems in Engineering, Aerospace and Sciences. - : American Institute of Physics (AIP). - 9780735414648 ; , s. 020063-1-020063-10 Konferensbidrag (refereegranskat)abstract In this paper a functional equation for the fractional derivative of the Riemann zeta function is presented. The fractional derivative of the zeta function is computed by a generalization of the Grunwald-Letnikov fractional operator, which satisfies the generalized Leibniz rule. It is applied to the asymmetric functional equation of the Rieman zeta function in order to obtain the result sought. Moreover, further properties of this fractional derivative are proposed and discussed.
46.	Gudmundsson, Jon Tomas, 1965-, et al. (författare) On the role of metastable states in low pressure oxygen discharges 2017 Ingår i: <em>AIP Conference Proceedings</em>. - : American Institute of Physics (AIP). Konferensbidrag (refereegranskat)abstract We use the one-dimensional object-oriented particle-in-cell Monte Carlo collision code oopd1 to explore the spatio-temporal evolution of the electron heating mechanism in a capacitively coupled oxygen discharge in the pressure range 10 – 200 mTorr. The electron heating is most significant in the sheath vicinity during the sheath expansion phase. We explore how including and excluding detachment by the singlet metastable states O2(a1 Δg) and O2(b1Σ+g) influences the heating mechanism, the effective electron temperature and electronegativity, in the oxygen discharge. We demonstrate that the detachment processes have a significant influence on the discharge properties, in particular for the higher pressures. At 10 mTorr the time averaged electron heating shows mainly ohmic heating in the plasma bulk (the electronegative core) and at higher pressures there is no ohmic heating in the plasma bulk, that is electron heating in the sheath regions dominates.
47.	Guo, Ning, 1992, et al. (författare) The effect of turbulent velocity fluctuations on the convective heat transfer to droplets subjected to evaporation and thermolysis 2016 Ingår i: AIP Conference Proceedings. - : Author(s). - 1551-7616 .- 0094-243X. - 9780735413924 ; 1738, s. 030007-1-4- Konferensbidrag (refereegranskat)abstract The effect of turbulent velocity fluctuations on the convective heat transfer to single droplets in a turbulent channel flow are investigated numerically. It is found that for properties relevant to typical liquid spray applications, the convective heat transfer is enhanced with increasing droplet size and bulk Reynolds number. The combined effect of convective heat transfer enhancement and increased driving forces for heat and mass transfer due to droplet dispersion is thereafter investigated for a commercial spray application. The probability distribution functions of droplet properties in the spray are found to be significantly affected by the presence of turbulent velocity fluctuations in the carrier phase.
48.	Hansson, Linus, et al. (författare) Development and implementation of a dynamic TES dispatch control component in a PV-CSP techno-economic performance modelling tool 2017 Ingår i: AIP Conference Proceedings. - : American Institute of Physics (AIP). - 0094-243X. - 9780735415225 Konferensbidrag (refereegranskat)abstract The dispatchability offered by thermal energy storage (TES) in concentrated solar power (CSP) and solar hybrid plants based on such technology presents the most important difference compared to power generation based only on photovoltaics (PV). This has also been one reason for recent hybridization efforts of the two technologies and the creation of Power Purchase Agreement (PPA) payment schemes based on offering higher payment multiples during daily hours of higher (peak or priority) demand. Recent studies involving plant-level thermal energy storage control strategies are however to a large extent based on pre-determined approaches, thereby not taking into account the actual dynamics of thermal energy storage system operation. In this study, the implementation of a dynamic dispatch strategy in the form of a TRNSYS controller for hybrid PV-CSP plants in the power-plant modelling tool DYESOPT is presented. In doing this it was attempted to gauge the benefits of incorporating a day-ahead approach to dispatch control compared to a fully pre-determined approach determining hourly dispatch only once prior to annual simulation. By implementing a dynamic strategy, it was found possible to enhance technical and economic performance for CSP-only plants designed for peaking operation and featuring low values of the solar multiple. This was achieved by enhancing dispatch control, primarily by taking storage levels at the beginning of every simulation day into account. The sequential prediction of the TES level could therefore be improved, notably for evaluated plants without integrated PV, for which the predicted storage levels deviated less than when PV was present in the design. While also featuring dispatch performance gains, optimal plant configurations for hybrid PV-CSP was found to present a trade-off in economic performance in the form of an increase in break-even electricity price when using the dynamic strategy which was offset to some extent by a reduction in upfront investment cost. An increase in turbine starts for the implemented strategy however highlights that this is where further improvements can be made.
49.	Hayashida, M., et al. (författare) First minute-scale variability in Fermi -LAT blazar observations during the giant outburst of 3C279 in 2015 June 2017 Ingår i: AIP Conference Proceedings. - : American Institute of Physics Inc.. - 0094-243X. - 9780735414563 Konferensbidrag (refereegranskat)abstract The Flat Spectrum Radio Quasar 3C 279 underwent several outbursts in the past, having flared with a peak γ-ray flux above 100 MeV (FE>100 MeV) exceeding 10-5 ph cm-2 s-1, in 2013 December, 2014 April, and 2015 June. The 2013 December outburst showed an unusually hard power-law γ-ray spectrum (index∼1.7), and an asymmetric light curve profile with few-hour time scale variability. This could be successfully explained using our second order Fermi acceleration model. The outburst in 2015 June was even more powerful, with FE>100 MeV ∼ 4×10-5 ph cm-2 s-1, the historically highest even when the EGRET era is included. For the first time, significant flux variability at sub-orbital timescales was found in blazar observations by Fermi-LAT, with flux doubling times of less than 5 minutes. In the standard external-Compton scenario with conical jet geometry, the minute-scale variability requires a very high bulk jet Lorentz factor (> 50) and extremely low magnetization even at the jet base (∼ 100RS). However, such a high bulk jet Lorentz factor and low magnetization at the jet base pose challenges to standard models of electromagnetically driven jets. Alternately, we consider a synchrotron origin scenario for the GeV γ-ray outburst, which would work in a magnetically dominated jet. In this contribution, we present observational results of the outbursts in detail and discuss current problems on relativistic jets inferred from γ-ray observations.
50.	Hellsten, Torbjörn, et al. (författare) RF Heating for Fusion Product Studies 2015 Ingår i: RADIOFREQUENCY POWER IN PLASMAS. - : American Institute of Physics (AIP). - 9780735413368 Konferensbidrag (refereegranskat)abstract Third harmonic cyclotron heating is an effective tool for accelerating deuterium (D) beams to the MeV energy range, suitable for studying ITER relevant fast particle physics in plasmas without significant tritium content. Such experiments were recently conducted in JET with an ITER like wall in D plasmas with He-3 concentrations up to 30% in order to boost the fusion reactivity by D-He-3 reactions. The harmonic cyclotron heating produces high-energy tails in the MeV range of D ions by on-axis heating and of He-3 ions by tangential off-axis heating. The discharges are characterized by long sawtooth free periods and a rich spectrum of MHD modes excited by the fast D and He-3 ions. The partitions of the power, which depend on the distribution function of D, vary strongly over several slowing down times. Self-consistent modelling of the distribution function with the SELFO-light code are presented and compared with experimental data from fast particle diagnostics.

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