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  • 301.
    Nordebo, Sven
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Parametric boundary integral equations for helical structures2016Konferensbidrag (Övrigt vetenskapligt)
  • 302.
    Nordebo, Sven
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Cinar, Gökhan
    Gustafsson, Stefan
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Ioannidis, Andreas
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Nilsson, Börje
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för matematik (MA).
    Asymptotic analysis of non-discrete radiating modes for open waveguide structures2014Ingår i: Mathematical methods in the applied sciences, ISSN 0170-4214, E-ISSN 1099-1476, Vol. 37, nr 2, Special Issue, s. 251-256Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This paper presents an asymptotic analysis of non-discrete radiating modes with applications in waveguide theory. As a main application, the radiating modes of an open waveguide structure with circular geometry is considered. A generalized Jordan's lemma is used to justify that field components can be calculated as the sum of discrete and non-discrete modes, that is, as the sum of residues of poles and an integral along the branch-cut defined by the transversal wavenumber of the exterior domain. An asymptotic expression is derived for field components at large distance along the waveguide and supplemented with rigorous upper and lower error bounds. A numerical example regarding the axial symmetric 0th order transverse magnetic modes of a thin copper wire in water is included to demonstrate that there may be a non-trivial balance between the contributions from discrete and non-discrete modes.

  • 303.
    Nordebo, Sven
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Cinar, Gökhan
    Gebze Institute of Technology, Turkey.
    Gustafsson, Stefan
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Nilsson, Börje
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för matematik (MA).
    Dispersion modeling and analysis for multilayered open coaxial waveguides2015Ingår i: IEEE transactions on microwave theory and techniques, ISSN 0018-9480, E-ISSN 1557-9670, Vol. 63, nr 6, s. 1791-1799Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This paper presents a detailed modeling and analysis regarding the dispersion characteristics ofmultilayered open coaxial waveguides or cables. The electromagnetic model is based on a layer recursive computation of axial-symmetric fields in connection with a magnetic frill generator excitation that can be calibrated to the current measured at the input of the cable. The layer recursive formulation enables a stable and efficient numerical computation of the related dispersion functions, as well as a detailed analysis regarding the analytic and asymptotic properties of the associated determinants. Modal contributions as well as the contribution from the associated branch-cut (nondiscrete radiating modes) are defined and analyzed. Measurements and modeling of pulse propagation on an 82-km-long HVDC power cable are presented as a concrete example. In this example, it is concluded that the contribution from the dominating axial-symmetric transverse magnetic mode is sufficient, and that the contribution from the branch-cut is negligible for all practical purposes, and in particular if the exterior domain is lossy. The main contribution of this paper is to provide the necessary modeling and analysistools for a quantitative study of these phenomena.

  • 304.
    Nordebo, Sven
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Dalarsson, Mariana
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Gustafsson, Mats
    Lund University, Sweden.
    Sjöberg, Daniel
    Lund University, Sweden.
    On the optimal plasmonic resonances in lossy media2018Ingår i: 2018 12th International Congress on Artificial Materials for Novel Wave Phenomena (Metamaterials), IEEE, 2018, s. 296-298Konferensbidrag (Refereegranskat)
    Abstract [en]

    An optimal plasmonic resonance is derived for small homogeneous and isotropic inclusions in a lossy surrounding medium. The optimal resonance is given in terms of any particular eigenmode (electrostatic resonance) associated with the double-layer potential for a smooth, but otherwise arbitrary surface.

  • 305.
    Nordebo, Sven
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Dalarsson, Mariana
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Ivanenko, Yevhen
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Sjöberg, Daniel
    Lund University.
    Bayford, Richard
    Middlesex University, UK.
    On the physical limitations for radio frequency absorption in gold nanoparticle suspensions2017Ingår i: Journal of Physics D: Applied Physics, ISSN 0022-3727, E-ISSN 1361-6463, Vol. 50, nr 15, artikel-id 155401Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This paper presents a study of the physical limitations for radio frequency absorption in gold nanoparticle (GNP) suspensions. A spherical geometry is considered consisting of a spherical suspension of colloidal GNPs characterized as an arbitrary passive dielectric material which is immersed in an arbitrary lossy medium. A relative heating coefficient and a corresponding optimal near field excitation are defined, taking the skin effect of the surrounding medium into account. The classical Mie theory for lossy media is also revisited, and it is shown that the optimal permittivity function yielding a maximal absorption inside the spherical suspension is a conjugate match with respect to the surrounding lossy material. A convex optimization approach is used to investigate the broadband realizability of an arbitrary passive material to approximate the desired conjugate match over a finite bandwidth, similar to the approximation of a metamaterial. A narrowband realizability study shows that for a surrounding medium consisting of a weak electrolyte solution, the electromagnetic heating, due to the electrophoretic (plasmonic) resonance phenomena inside the spherical GNP suspension, can be significant in the microwave regime, provided that the related Drude parameters can be tuned into (or near to) resonance. As a demonstration, some realistic Drude parameters are investigated concerning the volume fraction, mass, and friction constant of the GNPs. The amount of charge that can be accommodated by the GNPs is identified as one of the most important design parameters. However, the problem of reliably modelling, measuring and controlling the charge number of coated GNPs is not yet fully understood, and is still an open research issue in this field. The presented theory and related physical limitations provide a useful framework for further research in this direction. Future research is also aimed at an expansion towards arbitrary suspension geometries and the inclusion of thermodynamical analysis.

  • 306.
    Nordebo, Sven
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Dalarsson, Mariana
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Ivanenko, Yevhen
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Sjöberg, Daniel
    Lund University, Sweden.
    Bayford, Richard
    Middlesex University, UK.
    Parameter studies on optimal absorption and electrophoretic resonances in lossy media2017Ingår i: 32nd General Assembly and Scientific Symposium of the International Union of Radio Science, URSI GASS 2017, IEEE, 2017, s. 1768-1769Konferensbidrag (Refereegranskat)
  • 307.
    Nordebo, Sven
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Dalarsson, Mariana
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Khodadad, Davood
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Müller, Beat
    Swisstom AG, Switzerland.
    Waldermann, Andreas D.
    Swisstom AG, Switzerland.
    Becher, Tobias
    University Medical Centre Schleswig-Holstein, Germany.
    Frerichs, Inez
    University Medical Centre Schleswig-Holstein, Germany.
    Sophocleous, Louiza
    University of Cyprus, Cyprus.
    Sjöberg, Daniel
    Lund University.
    Seifnaraghi, Nima
    Middlesex University, UK.
    Bayford, Richard
    Middlesex University, UK.
    A parametric model for the changes in the complex valued conductivity of a lung during tidal breathing2018Ingår i: Journal of Physics D: Applied Physics, ISSN 0022-3727, E-ISSN 1361-6463, Vol. 51, nr 20, artikel-id 205401Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Classical homogenization theory based on the Hashin–Shtrikman coated ellipsoids is used to model the changes in the complex valued conductivity (or admittivity) of a lung during tidal breathing. Here, the lung is modeled as a two-phase composite material where the alveolar air-filling corresponds to the inclusion phase. The theory predicts a linear relationship between the real and the imaginary parts of the change in the complex valued conductivity of a lung during tidal breathing, and where the loss cotangent of the change is approximately the same as of the effective background conductivity and hence easy to estimate. The theory is illustrated with numerical examples based on realistic parameter values and frequency ranges used with electrical impedance tomography (EIT). The theory may be potentially useful for imaging and clinical evaluations in connection with lung EIT for respiratory management and control.

  • 308.
    Nordebo, Sven
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Gustafsson, Alexander
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    A Quasi-Static Electromagnetic Analysis for Experiments with Strong Permanent Magnets2014Ingår i: Progress in Electromagnetics Research B, ISSN 1937-6472, E-ISSN 1937-6472, Vol. 61, s. 1-16Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    An electromagnetic analysis is presented for experiments with strong permanent disc magnets. The analysis is based on the well known experiment that demonstrates the effect of circulating eddy currents by dropping a strong magnet through a vertically placed metal cylinder and observing how the magnet is slowly falling through the cylinder with a constant velocity. This experiment is quite spectacular with a super strong neodymium magnet and a thick metal cylinder made of copper or aluminum. A rigorous theory for this experiment is provided based on the quasi-static approximation of the Maxwell equations, an infinitely long cylinder (no edge effects) and a homogeneous magnetization of the disc magnet. The results are useful for teachers and students in electromagnetics who wish to obtain a deeper insight into the analysis and experiments regarding this phenomenon, or with industrial applications such as the grading and calibration of strong permanent magnets or with measurements of the conductivity of various metals, etc.. Several experiments and numerical computations are included to validate and to illustrate the theory.

  • 309.
    Nordebo, Sven
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Gustafsson, Mats
    Lund University.
    Ivanenko, Yevhen
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Nilsson, Börje
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för matematik (MA).
    Sjöberg, Daniel
    Lund University.
    Cylindrical multipole expansion for periodic sources with applications for three-phase power cables2018Ingår i: Mathematical methods in the applied sciences, ISSN 0170-4214, E-ISSN 1099-1476, Vol. 41, nr 3, s. 959-965Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This paper presents a c ylindrical multipole expansion for periodic sources with applications for three-phase power cables.It is the aim of the contribution to provide some analytical solutions and techniques that can be useful in the calculation ofcable losses. Explicit analytical results are given for the fields generated by a three-phase helical current distribution andwhich can be computed efficiently as an input to other numerical methods such as, for example , the Method of Moments.It is shown that the field computations are numerically stable at low frequencies (such as 50 Hz) as well as in the quasi-magnetostatic limit provided that sources are divergence-free. The cylindrical multipole expansion is fur thermore usedto derive an efficient analytical model of a measurement coil to measure and estimate the complex valued permeability ofmagnetic steel armour in the presence of a strong skin-effect.

  • 310.
    Nordebo, Sven
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Gustafsson, Mats
    Lund University.
    Nilsson, Börje
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för matematik (MA).
    Sjöberg, Daniel
    Lund University.
    Optimal Realizations of Passive Structures2014Ingår i: IEEE Transactions on Antennas and Propagation, ISSN 0018-926X, E-ISSN 1558-2221, Vol. 62, nr 9, s. 4686-4694Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This paper presents a convex optimization approach to study optimal realizations of passive electromagnetic structures. The optimization approach complements recently developed theory and techniques to derive sum rules and physical limitations for passive systems operating over a given bandwidth. The sum rules are based solely on the analytical properties of the corresponding Herglotz functions. However, the application of sum rules is limited by certain assumptions regarding the low- and high-frequency asymptotic behavior of the system, and the sum rules typically do not give much information towards an optimal realization of the passive system at hand. In contrast, the corresponding convex optimization problem is formulated to explicitly generate a Herglotz function as an optimal realization of the passive structure. The procedure does not require any additional assumptions on the low- and high frequency asymptotic behavior, but additional convex constraints can straightforwardly be incorporated in the formulation. Typical application areas are concerned with antennas, periodic structures, material responses, scattering, absorption, reflection, and extinction. In this paper, we consider three concrete examples regarding dispersion compensation for waveguides, passive metamaterials and passive radar absorbers.

  • 311.
    Nordebo, Sven
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE). Lund University.
    Gustafsson, Mats
    Lund University.
    Nilsson, Börje
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för matematik (MA).
    Sjödén, Therese
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för matematik (MA).
    Soldovieri, Francesco
    CNR, Institute for Electromagnetic Sensing of the Environment, National Research Council, Napoli, Italy .
    Fisher information analysis in electrical impedance tomography2013Ingår i: Journal of Geophysics and Engineering, ISSN 1742-2132, E-ISSN 1742-2140, Vol. 10, nr 6, s. Article ID: 064008-Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This paper provides a quantitative analysis of the optimal accuracy and resolution in electrical impedance tomography (EIT) based on the Cramér–Rao lower bound. The imaging problem is characterized by the forward operator and its Jacobian. The Fisher information operator is defined for a deterministic parameter in a real Hilbert space and a stochastic measurement in a finite-dimensional complex Hilbert space with a Gaussian measure. The connection between the Fisher information and the singular value decomposition (SVD) based on the maximum likelihood (ML) criterion (the ML-based SVD) is established. It is shown that the eigenspaces of the Fisher information provide a suitable basis to quantify the trade-off between the accuracy and the resolution of the (nonlinear) inverse problem. It is also shown that the truncated ML-based pseudo-inverse is a suitable regularization strategy for a linearized problem, which exploits sufficient statistics for estimation within these subspaces. The statistical-based Cramér–Rao lower bound provides a complement to the deterministic upper bounds and the L-curve techniques that are employed with linearized inversion. To this end, electrical impedance tomography provides an interesting example where the eigenvalues of the SVD usually do not exhibit a very sharp cut-off, and a trade-off between the accuracy and the resolution may be of practical importance. A numerical study of a hypothetical EIT problem is described, including a statistical analysis of the model errors due to the linearization.

  • 312.
    Nordebo, Sven
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Gustafsson, Mats
    Lund University.
    Sjöberg, Daniel
    Lund University.
    Passive approximation and optimization2015Ingår i: Progress in Electromagnetics Research Symposium (PIERS), 2015, s. 84-Konferensbidrag (Övrigt vetenskapligt)
    Ladda ner fulltext (pdf)
    fulltext
  • 313.
    Nordebo, Sven
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Gustafsson, Stefan
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Ioannidis, Andreas
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Nilsson, Börje
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för matematik (MA).
    Toft, Joachim
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för matematik (MA).
    On the generalized Jordan's lemma with applications in waveguide theory2013Ingår i: Proceeding of 2013 URSI International Symposium on Electromagnetic Theory (EMTS): International Conference Center Hiroshima, Hiroshima, Japan, May 20-24, 2013, 2013, s. 1039-1042Konferensbidrag (Refereegranskat)
    Abstract [en]

    This paper presents two variants of a generalized Jordan's lemma with applications in waveguide theory. As a main application is considered an asymptotic analysis for open waveguide structures with circular geometry. In particular, the generalized Jordan's lemma can be used to justify that field components can be calculated as the sum of discrete and non-discrete modes, i.e., as the sum of residues and an integral along the branch-cut defined by the transversal wavenumber of the exterior domain. An explicit example regarding the axial symmetric TM0 modes of a single core transmission line, wire, or optical fibre is included to demonstrate the associated asymptotic behavior for a typical open waveguide structure.

  • 314.
    Nordebo, Sven
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Gustfsson, Mats
    Lund University.
    Nilsson, Börje
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för matematik (MA).
    Sjöberg, Daniel
    Lund University.
    Cylindrical multipole expansion for helical structures2015Ingår i: M3ST (2015) Kalamat, Greece, 30 August-1 September: Book of Abstracts, 2015Konferensbidrag (Övrigt vetenskapligt)
    Ladda ner fulltext (pdf)
    fulltext
  • 315.
    Nordebo, Sven
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Ioannidis, Andreas
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Nilsson, Börje
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för matematik (MA).
    Reduced volume integral formulations for an open waveguide based on the cylindrical vector wave expansion2013Ingår i: PIERS 2013 Stockholm: Progress in Electromagnetics Research Symposium : Proceedings, Electromagnetics Academy , 2013, s. 633-637Konferensbidrag (Refereegranskat)
    Abstract [en]

    A Fourier representation of the electric field volume integral equation for an open and cylindrically symmetrical waveguide is given in this paper. The waveguide material is assumed to be isotropic, non-magnetic and with an arbitrary radial variation in the relative permittivity. The Fourier representation yields a system of one-dimensional integral equations, one system for each azimuthal index and where the Fourier variable for the longitudinal direction plays the role of a spectral parameter. The integral equation is of the second kind and has a kernel that is generally discontinuous on the diagonal and singular at the origin. In the axial symmetric case, it can readily be shown that the elements of the matrix kernel belong to an L2-space, and hence that the integral operator is compact and the analytic Fredholm theorem is applicable.

  • 316.
    Nordebo, Sven
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Ivanenko, Yevhen
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Periodic Green's dyadics for helical current distributions2015Ingår i: Progress in Electromagnetics Research Symposium (PIERS), Electromagnetics Academy , 2015, s. 1069-Konferensbidrag (Övrigt vetenskapligt)
    Ladda ner fulltext (pdf)
    fulltext
  • 317.
    Nordebo, Sven
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Ivanenko, Yevhen
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Bayford, Richard
    Middlesex Univ, UK.
    On the optimal plasmonic resonances in gold nanospheres embedded in dispersive media2019Ingår i: 2019 URSI International Symposium on Electromagnetic Theory (EMTS), IEEE, 2019, s. 1-4Konferensbidrag (Refereegranskat)
    Abstract [en]

    New fundamental upper bounds have recently been given regarding the optimal plasmonic multipole resonances of a rotationally invariant sphere embedded in a lossy surrounding medium. The new theory is based on a generalized optical theorem for the absorption of a sphere in a lossy medium and employs straightforward analysis to explicitly maximize a concave function. The new bounds are briefly summarized in this paper and then employed in a study concerning the effectiveness of using gold nanospheres as absorbers of the sizes typically used in biomedical applications and plasmonic photothermal therapy.

  • 318.
    Nordebo, Sven
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Kristensson, Gerhard
    Lund University.
    Mirmoosa, Mohammad
    Aalto Univ, Finland.
    Tretyakov, Sergei
    Aalto Univ, Finland.
    Optimal plasmonic multipole resonances of a sphere in lossy media2019Ingår i: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 99, nr 5, artikel-id 054301Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Fundamental upper bounds are given for the plasmonic multipole absorption and scattering of a rotationally invariant dielectric sphere embedded in a lossy surrounding medium. A specialized Mie theory is developed for this purpose and when combined with the corresponding generalized optical theorem, an optimization problem is obtained which is explicitly solved by straightforward analysis. In particular, the absorption cross section is a concave quadratic form in the related Mie (scattering) parameters and the convex scattering cross section can be maximized by using a Lagrange multiplier constraining the absorption to be non-negative. For the homogeneous sphere, the Weierstrass preparation theorem is used to establish the existence and the uniqueness of the plasmonic singularities and explicit asymptotic expressions are given for the dipole and the quadrupole. It is shown that the optimal passive material for multipole absorption and scattering of a small homogeneous dielectric sphere embedded in a dispersive medium is given approximately as the complex conjugate and the real part of the corresponding pole positions, respectively. Numerical examples are given to illustrate the theory, including a comparison with the plasmonic dipole and quadrupole resonances obtained in gold, silver, and aluminum nanospheres based on some specific Brendel-Bormann (BB) dielectric models for these metals. Based on these BB models, it is interesting to note that the metal spheres can be tuned to optimal absorption at a particular size at a particular frequency.

  • 319.
    Nordebo, Sven
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Mirmoosa, Mohammad
    Aalto Univ, Finland.
    Tretyakov, Sergei
    Aalto Univ, Finland.
    On the quasistatic optimal plasmonic resonances in lossy media2019Ingår i: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 125, nr 10, s. 1-11, artikel-id 103105Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This paper discusses and analyzes the quasistatic optimal plasmonic dipole resonance of a small dielectric particle embedded in a lossy surrounding medium. The optimal resonance at any given frequency is defined by the complex valued dielectric constant that maximizes the absorption of the particle under the quasistatic approximation and a passivity constraint. In particular, for an ellipsoid aligned along the exciting field, the optimal material property is given by the complex conjugate of the pole position associated with the polarizability of the particle. In this paper, we employ the classical Mie theory to analyze this approximation for spherical particles in a lossy surrounding medium. It turns out that the quasistatic optimal plasmonic resonance is valid, provided that the electrical size of the particle is sufficiently small at the same time as the external losses are sufficiently large. Hence, it is important to note that this approximation cannot be used for a lossless medium, and which is also obvious, since the quasistatic optimal dipole absorption becomes unbounded for this case. Moreover, it turns out that the optimal normalized absorption cross sectional area of the small dielectric sphere has a very subtle limiting behavior and is, in fact, unbounded even in full dynamics when both the electrical size and the exterior losses tend to zero at the same time. A detailed analysis is carried out to assess the validity of the quasistatic estimation of the optimal resonance, and numerical examples are included to illustrate the asymptotic results.

  • 320.
    Nordebo, Sven
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Nilsson, Börje
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för matematik (MA).
    Gustafsson, Stefan
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Biro, Thomas
    Cinar, Gökhan
    Gustafsson, Mats
    Karlsson, Anders
    Sjöberg, Mats
    Low-frequency dispersion characteristics of a multilayered coaxial cable2013Ingår i: Journal of Engineering Mathematics, ISSN 0022-0833, E-ISSN 1573-2703, Vol. 83, nr 1, s. 169-184Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This paper provides an exact asymptotic analysis regarding the low-frequency dispersion characteristics of a multilayered coaxial cable. A layer-recursive description of the dispersion function is derived that is well suited for asymptotic analysis. The recursion is based on two well-behaved (meromorphic) subdeterminants defined by a perfectly electrically conducting (PEC) and a perfectly magnetically conducting termination, respectively. For an open waveguide structure, the dispersion function is a combination of two such functions, and there is only one branch point that is related to the exterior domain. It is shown that if there is one isolating layer and a PEC outer shield, then the classical Weierstrass preparation theorem can be used to prove that the low-frequency behavior of the propagation constant is governed by the square root of the complex frequency, and an exact analytical expression for the dominating term of the asymptotic expansion is derived. It is furthermore shown that the same asymptotic expansion is valid to its lowest order even if the outer shield has finite conductivity and there is an infinite exterior region with finite nonzero conductivity. As a practical application of the theory, a high-voltage direct current (HVDC) power cable is analyzed and a numerical solution to the dispersion relation is validated by comparisons with the asymptotic analysis. The comparison reveals that the low-frequency dispersion characteristics of the power cable is very complicated and a first-order asymptotic approximation is valid only at extremely low frequencies (below 1 Hz). It is noted that the only way to come to this conclusion is to actually perform the asymptotic analysis. Hence, for practical modeling purposes, such as with fault localization, an accurate numerical solution to the dispersion relation is necessary and the asymptotic analysis is useful as a validation tool.

  • 321.
    Nordebo, Sven
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Stumpf, Martin
    Brno Univ Technol, Czech Republic.
    Ivanenko, Yevhen
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    A multi-resolution 4-D FFT approach to parametric boundary integral equations for helical structures2016Ingår i: 2016 URSI International Symposium on Electromagnetic Theory (EMTS), IEEE Press, 2016, s. 218-221Konferensbidrag (Refereegranskat)
    Abstract [en]

    This paper gives a report of an ongoing research to develop parametric boundary integral equations for helical structures and their application in the computation of induced currents and losses in three-phase power cables. The proposed technique is formulated in terms of the Electric Field Integral Equation (EFIE) or the Magnetic Field Integral Equation (MFIE) for a penetrable object together with the appropriate periodic Green's functions and a suitable parameterization of the helical structure. A simple and efficient numerical scheme is proposed for the computation of the impedance matrix in the Method of Moments (MoM) which is based on a multi-resolution 4-D FFT computation followed by polynomial extrapolation. Numerical examples are included demonstrating that the singular integrals have almost linear convergence and hence that linear or quadratic extrapolation can be used to yield accurate results.

  • 322.
    Norgren, Martin
    et al.
    KTH Royal Institute of Technology.
    de Saracho, Irene Ortiz
    KTH Royal Instute of Technology.
    Dalarsson, Mariana
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Perturbation Approach to Shape Reconstruction in a Rectangular Waveguide using Experimental Data2018Ingår i: 2018 International Applied Computational Electromagnetics Society Symposium (ACES), IEEE, 2018Konferensbidrag (Refereegranskat)
    Abstract [en]

    We consider the inverse problem of reconstructing the shape of a deformation in one of the broad walls of a rectangular waveguide. Assuming a small deformation, resulting in weak scattering, the direct problem is solved using a first order perturbation approach. Hence, the inverse problem becomes linear and is formulated as an equation system for a set of expansion coefficients. The illposedness of the inverse problem is handled with regularization, by adding a penalty term which weight is determined by the L-curve method. The theory is tested on experimental reflection data, using the dominant mode of the waveguide. The reconstructed shape is in qualitative agreement with the true shape, but a detailed resolution cannot be obtained due to insufficient quality of the experimental data. Extensions and improvements of the method are discussed.

  • 323.
    Nossa, Javier
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE). Lund University.
    Canali, Carlo M.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE). Lund Univ,.
    Cotunneling signatures of Spin-Electric coupling in frustrated triangularmolecular magnets2014Ingår i: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 89, nr 23, s. Article ID: 235435-Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The ground state of frustrated (antiferromagnetic) triangular molecular magnets is characterized by two total-spin S = 1/2 doublets with opposite chirality. According to a group theory analysis [M. Trif et al., Phys. Rev. Lett. 101, 217201 (2008)] an external electric field can efficiently couple these two chiral spin states, even when the spin-orbit interaction (SOI) is absent. The strength of this coupling, d, is determined by an off-diagonal matrix element of the dipole operator, which can be calculated by ab-initio methods [M. F. Islam et al., Phys. Rev. B 82, 155446 (2010)]. In this work we propose that Coulomb-blockade transport experiments in the cotunneling regime can provide a direct way to determine the spin-electric coupling strength. Indeed, an electric field generates a d-dependent splitting of the ground state manifold, which can be detected in the inelastic cotunneling conductance. Our theoretical analysis is supported by master-equation calculations of quantum transport in the cotunneling regime. We employ a Hubbard-model approach to elucidate the relationship between the Hubbard parameters t and U, and the spin-electric coupling constant d. This allows us to predict the regime in which the coupling constant d can be extracted from experiment.

     

  • 324.
    Nossa, Javier
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Canali, Carlo M.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Cotunneling signatures of spin-electric coupling in frustrated triangularmolecular magnets2013Ingår i: APS MARCH MEETING 2013, 2013Konferensbidrag (Refereegranskat)
  • 325.
    Nossa, Javier
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE). Lunds universitet.
    Islam, Fhokrul
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Canali, Carlo M.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Pederson, M. R.
    US DOE, Off Basic Energy Sci, Washington, DC 20585 USA.
    Electric control of a {Fe4} single-molecule magnet in a single-electron transistor2013Ingår i: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 88, nr 22, s. Article ID: 224423-Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Using first-principles methods, we study theoretically the properties of an individual {Fe-4} single-molecule magnet (SMM) attached to metallic leads in a single-electron transistor geometry. We show that the conductive leads do not affect the spin ordering and magnetic anisotropy of the neutral SMM. On the other hand, the leads have a strong effect on the anisotropy of the charged states of the molecule, which are probed in Coulomb blockade transport. Furthermore, we demonstrate that an external electric potential, modeling a gate electrode, can be used to manipulate the magnetic properties of the system. For a charged molecule, by localizing the extra charge with the gate voltage closer to the magnetic core, the anisotropy magnitude and spin ordering converges to the values found for the isolated {Fe-4} SMM. We compare these findings with the results of recent quantum transport experiments in three-terminal devices.

  • 326.
    Nyberg, Kim
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Karlsson, Linn
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Manual för elMaster Concept 20122014Självständigt arbete på grundnivå (högskoleexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [en]

    This thesis includes a description of the project flow for our projects at Semcon. The emphasis is on designing a manual for elMaster Concept.

    The project flow provides several minor and major elements plotting schedules for this project and the establishment of a manual. When a schedule is drawn, lists and tables with components and connections can be created. This is done to better manage drawings and make changes. These diagrams and tables are used in product manufacturing, testings, controls. It can be edited during processing to finished product. elMaster helps to create a structure in the project through its aspects in the treeview. This is connected to the Design for easy connecting schedules for the project and its various components.

    This thesis also touches rendering of certain parts of a remote control system and a FAT-testing (Factory Acceptance Test) of a 480V switchgear. for the entire flow of a project and to make it easier to get an intelligible idea of how a project should be built in the most optimal way. It gives an idea of how various schedules, lists and tables used in real time and edited to get the proper documentation to the customer.

    The manual is designed for inexperienced elMaster. They can learn the program with the help of an example that is based on a real project. In addition to the example are all detailed information in order to advance in a project without much supervision.

    The thesis includes information on various components that may be included in a larger project. Therefore additional information on technical background.

    To acquire a better understanding of the remote control system and 480V switchgear, we were seeking information in ABB Handbok Elkraft [1] and Elkraftshandboken Elkraftsystem [2] as reported in a section of the thesis.

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    Examensarbete
  • 327.
    Okabayashi, Norio
    et al.
    University of Regensburg , Germany ; Kanazawa University, Japan.
    Gustafsson, Alexander
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Peronio, Angelo
    University of Regensburg, Germany.
    Paulsson, Magnus
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Arai, Toyoko
    Kanazawa University, Japan.
    Giessibl, Franz
    University of Regensburg, Germany.
    Influence of atomic tip structure on the intensity of inelastic tunneling spectroscopy data analyzed by combined scanning tunneling spectroscopy, force microscopy, and density functional theory2016Ingår i: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 93, nr 16, artikel-id 165415Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Achieving a high intensity in inelastic scanning tunneling spectroscopy (IETS) is important for precise measurements. The intensity of the IETS signal can vary by up to a factor of 3 for various tips without an apparent reason accessible by scanning tunneling microscopy (STM) alone. Here, we show that combining STM and IETS with atomic force microscopy enables carbon monoxide front-atom identification, revealing that high IETS intensities for CO/Cu(111) are obtained for single-atom tips, while the intensity drops sharply for multiatom tips. Adsorption of the CO molecule on a Cu adatom [CO/Cu/Cu(111)] such that the molecule is elevated over the substrate strongly diminishes the tip dependence of IETS intensity, showing that an elevated position channels most of the tunneling current through the CO molecule even for multiatom tips, while a large fraction of the tunneling current bypasses the CO molecule in the case of CO/Cu(111).

  • 328.
    Okabayashi, Norio
    et al.
    Kanazawa University.
    Paulsson, Magnus
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Komeda, Tadahiro
    Tohoku University.
    Inelastic electron tunneling process for alkanethiol self-assembled monolayers2013Ingår i: Progress in Surface Science, ISSN 0079-6816, E-ISSN 1878-4240, Vol. 88, nr 1, s. 1-38Artikel, forskningsöversikt (Refereegranskat)
    Abstract [en]

    Recent investigations of inelastic electron tunneling spectroscopy (IETS) for alkanethiol self-assembled monolayers (SAMs) are reviewed. Alkanethiol SAMs are usually prepared by immersing a gold substrate into a solution of alkanethiol molecules, and they are very stable, even under ambient conditions. Thus, alkanethiol SAMs have been used as typical molecules for research into molecular electronics. Infrared spectroscopy and electron energy loss spectroscopy (EELS) have frequently been employed to characterize SAMs on the macroscopic scale. For characterization of alkanethiol SAMs on the nanometer scale region, or for single alkanethiol molecules through which electrons actually tunnel, IETS has proven to be an effective method. However, IETS experiments for alkanethiol SAMs employing different methods have shown large differences, i.e., there is a lack of standard data for alkanethiol SAMs with which to understand the IET process or to satisfactorily compare with theoretical investigations. An effective means of acquiring standard data is the formation of a tunneling junction with scanning tunneling microscopy (STM). After explanation of the STM experimental techniques, standard IETS data are presented whereby a contact condition between the tip and SAM is tuned. We have found that many vibrational modes are detected by STM-IETS, as is also the case for EELS. These results are compared with LET spectra measured with different tunneling junctions. In order to precisely investigate which vibrational modes are active in IETS, isotope labeling of alkanethiols with specifically synthesized isotopically substituted molecule has been examined. This method provides unambiguous assignments of IET spectra peaks and site selectivity for alkanethiol SAMs such that all parts of the alkanethiol molecules almost equally contribute to the IET process. The LET process is also discussed based on density functional theory and nonequilibrium Green's function calculations. These results quantitatively reproduce many the experimentally observed features, whereas Fermi's golden rule for JETS qualitatively explains the propensity rule and site selectivity observed in the experiments. However, comparison between experiment and theory reveals a large difference in JETS intensity for the C H stretching mode that originates from the side chains of the alkanethiol molecules. In order to explain this difference, we discuss the importance of an intermolecular tunneling process in the SAM. Application of STM-IETS to identify a hydrogenated alkanethiol molecule inserted into a deuterated alkanethiol SAM matrix is also demonstrated. (C) 2012 Elsevier Ltd. All rights reserved.

  • 329.
    Okabayashi, Norio
    et al.
    Univ Regensburg, Germany;Kanazawa Univ, Japan.
    Peronio, Angelo
    Univ Regensburg, Germany.
    Paulsson, Magnus
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Arai, Toyoko
    Kanazawa Univ, Japan.
    Giessibl, Franz J.
    Univ Regensburg, Germany.
    Vibrations of a molecule in an external force field2018Ingår i: Proceedings of the National Academy of Sciences of the United States of America, ISSN 0027-8424, E-ISSN 1091-6490, Vol. 115, nr 18, s. 4571-4576Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The vibration of a molecule adsorbed on a surface contains essential information on the molecule–surface bond, which is important to understand the surface reactions that occur, e.g., in catalytic reactions. Accessing the vibrational energies of a single molecule is possible by combining scanning tunneling microscopy with inelastic electron spectroscopy. However, the tip of a microscope exerts a force on a nearby molecule, and possibly even induces slight structural changes. To study this problem, we have further incorporated atomic force microscopy. The relationship between the exerted forces and vibrational energies is well reproduced by a classical mechanical model. This combined technique opens the possibility to study the atomic-scale interaction of a molecule on a surface with unprecedented precision.The oscillation frequencies of a molecule on a surface are determined by the mass distribution in the molecule and the restoring forces that occur when the molecule bends. The restoring force originates from the atomic-scale interaction within the molecule and with the surface, which plays an essential role in the dynamics and reactivity of the molecule. In 1998, a combination of scanning tunneling microscopy with inelastic tunneling spectroscopy revealed the vibrational frequencies of single molecules adsorbed on a surface. However, the probe tip itself exerts forces on the molecule, changing its oscillation frequencies. Here, we combine atomic force microscopy with inelastic tunneling spectroscopy and measure the influence of the forces exerted by the tip on the lateral vibrational modes of a carbon monoxide molecule on a copper surface. Comparing the experimental data to a mechanical model of the vibrating molecule shows that the bonds within the molecule and with the surface are weakened by the proximity of the tip. This combination of techniques can be applied to analyze complex molecular vibrations and the mechanics of forming and loosening chemical bonds, as well as to study the mechanics of bond breaking in chemical reactions and atomic manipulation.

  • 330.
    Olsson, Patrik
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    I den Tysta Kunskapens Stjärnljus: Eller hur gör man när månen går i moln?2015Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Syftet med den här uppsatsen är att lyfta upp tyst och tystad kunskap och hur den ter sig i olika sammanhang i kärnkraftsbranschen. I första hand ägnas uppsatsen åt de dilemman som instruktören står inför vid genomförande av kurser och utbildningar av teoretisk och praktisk karaktär. Även organisation och ledarskap beaktas som viktiga parametrar i sammanhanget utbildning.

    Uppsatsen syftar inte till att ge några entydiga svar och gör inte heller anspråk på att komma med lösningar. I de resonemang som förs kommer emellertid svar och lösningar att beröras.

    Den metod som använts kallas för dialogseminariemetoden och den har tillämpats fullt ut genom de exempel som används. Det empiriska materialet bottnar i de exemplen som har sitt ursprung från de dialogseminarietillfällen som föregått uppsatsskrivandet i masterutbildningen samt från tidigare dialogseminarieserier. Sett ur ett språkligt perspektiv har svängarna tagits ut en del med syfte att skapa ett större djup i det som skrivs. En del kallar det för poesi.

    Då uppsatsen i första hand betraktar tyst kunskap kommer det fram att den tar lång tid att erövra, men kan förloras snabbt. Uppsatsen beskriver olika dilemman som hänger ihop med kunskap och kunskapsinhämtning både ur instruktörens samt kursdeltagarens perspektiv. Uppsatsen visar vikten av att de trekunskapstyperna påstående-, färdighets- och förtrogenhetskunskap inte glider ifrån varandra. Om till exempel förtrogenhetskunskapen reduceras till ett minimum kommer det att påverka de andra två kunskapstyperna också.

     Då syftet är ett belysa utbildning i kärnkraftsbranschen har målet inte varit primärt att nå några resultat. Men det som framkommer är vikten av att en organisation eller ledarskap inte begränsar individen utan bejakar kunskapstörst och viljan att göra ett bra arbete. Därtill kommer att skapa förutsättningar för verkspraktik och fortsatt egen utveckling. Uppsatsen visar också på vikten av att ta emot nyanställda på ett bra sätt såväl som hur kunskap förmedlas från en kollega som kommer att gå i pension.

    I branschen nämns "Operational excellence" som något att sträva efter. Men vad det innebär eller hur det påverkar instruktörernas praxis går inte att läsa ut än. Excellence kan ses som något som kommer inifrån en själv och kan inte komma utifrån och in.

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    I det Tysta Kunskapens Stjärnljus
  • 331.
    Olén, Annika
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    ERFARENHET + REFLEKTION = KUNSKAP: en bildningsresa på gymnasiet2014Självständigt arbete på avancerad nivå (magisterexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Essän belyser de problem som kan uppstå i utvecklingen av ett yrkesutövande på en skola eller en arbetsplats. Problem som är svåra att sätta ord på och som framstår som dilemman då de är abstrakta i sin utformning.

    Att lära sig ett yrke kan vara svårt, framför allt de yrken som kräver en speciell yrkeskunskap som kan vara svår att sätta ord på. Den tysta kunskapen. Att lära ut denna kunskap kräver speciella metoder. I denna essä har dialogseminariemetoden använts som är ett sätt att reflektera över kunskap och lärande. Genom att reflektera över olika dilemman som uppstår inom yrket och lärarandet kan kunskapen bli mer synlig och uppenbar för de blivande yrkesutövarna, i detta fall eleverna.

    Dialogseminariemetoden visade sig vara framgångsrik och ledde till att fler elever började förstå och reflektera över deras kunskaper och hur man lär sig. Den tysta kunskapen exemplifierades och genom samtal lyckades vi skapa en arena som lyfte dilemman ur och från verkligheten. Dilemman som blev både mer tydliga och konkreta än tidigare.

     

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  • 332.
    Oreborn, Ulf
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    IR spectroscopy for vibrational modes: A semi-classical approach based on classical electrodynamicsand modern quantum mechanics2018Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [en]

    The atoms of a molecule are always restless and are constantly moving in one way or another.Apart from rotations and translations, they may vibrate in many different modes. They may moveradially toward or from each other, so called stretching. This can be done symmetrically or asymmetrically.The angels between a pair of atoms may change seen from a common atom, so calledbending. This may be done in a common plane like scissoring or rocking, or out of plane like waggingor twisting.Anyhow, it is of interest to study these movements — since they work as a fingerprint of themolecule. Two methods for studying these behavior are Raman- and IR-spectroscopy. Some vibrations,such as symmetric stretching, are mainly seen using Raman spectroscopy (Raman active); whilebending and asymmetric stretching are primarily detected by IR spectroscopy (IR active) However,all types of combinations exist, so there are no watertight compartments between them. Instead, themethods are complementary to each other.In this article, I build up a semi-classical model of the vibrations for the case of IR-spectroscopy,and implement it in Mathematica to test the model. It is based on classical physics such as vibratingspringmechanics and Maxwell’s electrodynamics, but the vibrations are computed using modernphysics quantum mechanics. Since there are several atoms involved (say N) and the vibrations betweenthese atoms are in 3 dimensions, this may be described by 3N coupled 1-dimensional harmonicoscillators. By suitable transformations these oscillators are uncoupled, but results in a wave functionwhich is the product of 3N eigenfunctions, one for each oscillator’s eigenfunction of a given mode.Adding a time varying electric field (the IR-illumination), we need the time dependent SchrödingerEquation, where the potential is time varying sinusoidally. Necessary perturbation theory for suchtime dependency is described in some details, and an expression for the dipole moment needed forthe estimation of the IR absorption by the molecule is given. However, the model also depend onthe electrons’ orbitals and the total bond energy within the molecule. These are given by a DFT(Density Functional Theory) computer code, which serve as input to my calculations.The standard approach to do IR-spectrum calculations is to use DFT also to move the atoms inthe directions of the vibrations and compute how the dipole moments for the molecules change. Mymethod is instead to use SE directly for the many vibrating particle problem based on the knownexact solutions to the one dimensional harmonic oscillator. This is followed by perturbation theoryfor the time dependency of the IR-field to get the dipole moments.The drawback with my approach is that the electron clouds around the atoms are not affectedat all by the vibrations, they just follow the nuclei. The DFT approach takes care of the changingelectron density functions. However, my approach solves the vibrational problem more directly withthe SE and takes care of the time dependent potential using perturbation theory.Computational results for seven molecules containing between 2 and 11 atoms are shown andcompared with spectroscopic parameters and measurements compiled by established references. Theconclusion is that my model and computational output are well in accordance with these references,and some shortcomings and possible enhancements are pointed out. The drawback with the electronclouds might affect the absorption levels of the vibrations rather than their energies and are possiblein future work to take into account.

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  • 333.
    Pacuski, Wojciech
    et al.
    University of Warsaw, Poland.
    Grzeszczyk, Magdalena
    University of Warsaw, Poland.
    Nogajewski, Karol
    University of Warsaw, Poland.
    Bogucki, Aleksander
    University of Warsaw, Poland.
    Oreszczuk, Kacper
    University of Warsaw, Poland.
    Kucharek, Julia
    University of Warsaw, Poland.
    Połczyńska, Karolina E.
    University of Warsaw, Poland.
    Seredyński, Bartłomiej
    University of Warsaw, Poland.
    Rodek, Aleksander
    University of Warsaw, Poland.
    Bożek, Rafał
    University of Warsaw, Poland.
    Taniguchi, Takashi
    National Institute for Materials Science, Japan.
    Watanabe, Kenji
    National Institute for Materials Science, Japan.
    Kret, Slawomir
    Institute of Physics, Polish Academy of Sciences, Poland.
    Sadowski, Janusz
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE). University of Warsaw, Poland;Polish Academy of Sciences, Poland.
    Kazimierczuk, Tomasz
    University of Warsaw, Poland.
    Potemski, Marek
    Laboratoire National des Champs Magnétiques Intenses, France;University of Warsaw, Poland.
    Kossacki, Piotr
    University of Warsaw, Poland.
    Narrow Excitonic Lines and Large-Scale Homogeneity of Transition-Metal Dichalcogenide Monolayers Grown by Molecular Beam Epitaxy on Hexagonal Boron Nitride2020Ingår i: Nano letters (Print), ISSN 1530-6984, E-ISSN 1530-6992, Vol. 20, nr 5, s. 3058-3066Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Monolayer transition-metal dichalcogenides(TMDs) manifest exceptional optical properties related to narrow excitonic resonances. However, these properties have been so far explored only for structures produced by techniques inducing considerable large-scale inhomogeneity. In contrast, techniques which are essentially free from this disadvantage, such as molecular beam epitaxy (MBE), have to date yielded only structures characterized by considerable spectral broadening, which hinders most of the interesting optical effects. Here, we report for the firsttime on the MBE-grown TMD exhibiting narrow and resolved spectral lines of neutral and charged exciton. Moreover, our material exhibits unprecedented high homogeneity of optical properties, with variation of the exciton energy as small as ±0.16 meV over a distance of tens of micrometers. Our recipe for MBE growth is presented for MoSe2 and includes the use of atomically flat hexagonal boron nitride substrate. This recipe opens a possibility of producing TMD heterostructures with optical quality, dimensions, and homogeneity required for optoelectronic applications.

  • 334.
    Pan, Yaobin
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Impact of DOA (direction of arrival): in 4G MIMO Systems2015Självständigt arbete på grundnivå (kandidatexamen), 15 poäng / 22,5 hpStudentuppsats (Examensarbete)
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  • 335.
    Pan, Yaobin
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE). university.
    Li, Xizhuo
    Design and Implementation of Sigma-Delta Converter: in Oversampling frequency2016Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [en]

    Nowadays, Sigma-Delta analog-to-digital converters have been widely used in the technology of analog-to-digital conversion. It depends on the merits that the approach of Sigma-Delta has. The signal converted by oversampling is precise and well-suited in signal processing systems.This thesis mainly focuses on the principles and simulations of fundamental first-order Sigma-Delta converter, and some brief introductions about other Sigma-Delta converters.The main researches of this thesis are as follows:

    (1)This thesis shows not only the path about development of technology of different ADCs, but also the features and principles of these ADCs and their structures.

    (2)The thesis discusses how the technologies of oversampling and noise shaping are used in Sigma-Delta analog-to-digital conversion.

    (3)Illustrate different orders Sigma-Delta converters in different bits and their advantages and disadvantages, respectively.

    (4)The simulation is given in Matlab(Simulink). Typical first-order SigmaDelta converter is simulated with additional noise which will impact the input signal when implement.

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  • 336.
    Panchal, N.
    et al.
    Homi Bhabha Natl Inst, India;Tata Inst Fundamental Res, India.
    Senniappan, Mohanraj
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE). Homi Bhabha Natl Inst, India;Tata Inst Fundamental Res, India.
    Kumar, A.
    Homi Bhabha Natl Inst, India;Tata Inst Fundamental Res, India.
    Dey, T.
    Homi Bhabha Natl Inst, India;Tata Inst Fundamental Res, India.
    Majumder, G.
    Tata Inst Fundamental Res, India.
    Shinde, R.
    Tata Inst Fundamental Res, India.
    Verma, P.
    Tata Inst Fundamental Res, India.
    Satyanarayana, B.
    Tata Inst Fundamental Res, India.
    Datar, V. M.
    Tata Inst Fundamental Res, India.
    A compact cosmic muon veto detector and possible use with the Iron Calorimeter detector for neutrinos2017Ingår i: Journal of Instrumentation, ISSN 1748-0221, E-ISSN 1748-0221, Vol. 12, artikel-id T11002Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The motivation for a cosmic muon veto (CMV) detector is to explore the possibility of locating the proposed large Iron Calorimeter (ICAL) detector at the India based Neutrino Observatory (INO) at a shallow depth. An initial effort in that direction, through the assembly and testing of a similar to 1 m x 1 m x 0.3 m plastic scintillator based detector, is described. The plan for making a CMV detector for a smaller prototype mini-ICAL is also outlined.

  • 337.
    Pappiland, Nasreen Omer Karim
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Styrning av serieresonanskrets med PLL: Control of a series resonant circuit with a PLL2013Självständigt arbete på grundnivå (högskoleexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Svenska

    Examensarbetet har som mål att ta fram en lösning för ett styrsystem för styrning av en helbrygga i en mätkrets. Mätkretsen ska styras i resonans, för att mäta effektförlust i en transformator. Arbetet har gjorts i samarbete med Alstom i Växjö. I examensarbetet har en PLL (Phase Locked Loop) som styrsystem undersökts. PLL:en består av tre delar, en fasdetektor, en charge pump och en VCO (voltage controlled oscillator).

    Både PLL:en och mätkretsen har simulerats och kopplats för sig. De har även satts ihop. Frekvensen och matningsspänningen skilde sig mellan simulering och mätning, men funktionaliteten kunde visas.

    Nyckelord: PLL, fasdetektor, charge pump, VCO, helbrygga, push-pull, transformator och serieresonans.

  • 338.
    Paschoal Jr, W.
    et al.
    Solid State Physics/The Nanometer Structure Consortium, Lund University, Box 118, SE-221 00 Lund, Sweden;Dept. of Mathematics, Physics and Electrical Engineering, Halmstad University, Box 823, SE-301 18, Halmstad, Sweden .
    Kumar, Sandeep
    Solid State Physics/The Nanometer Structure Consortium, Lund University, Box 118, SE-221 00 Lund, Sweden;Dept. of Mathematics, Physics and Electrical Engineering, Halmstad University, Box 823, SE-301 18, Halmstad, Sweden .
    Jacobsson, D.
    Solid State Physics/The Nanometer Structure Consortium, Lund University, Box 118, SE-221 00 Lund, Sweden.
    Johannes, A.
    Institute for Solid State Physics, Friedrich-Schiller-University Jena, Max-Wien-Platz 1, D-07743 Jena, Germany.
    Jain, V.
    Solid State Physics/The Nanometer Structure Consortium, Lund University, Box 118, SE-221 00 Lund, Sweden;Dept. of Mathematics, Physics and Electrical Engineering, Halmstad University, Box 823, SE-301 18, Halmstad, Sweden .
    Canali, Carlo M.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Pertsova, Anna
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Ronning, C.
    Institute for Solid State Physics, Friedrich-Schiller-University Jena, Max-Wien-Platz 1, D-07743 Jena, Germany.
    Dick, C. A.
    Solid State Physics/The Nanometer Structure Consortium, Lund University, Box 118, SE-221 00 Lund, Sweden;Center for Analysis and Synthesis, Lund University, Box 124, S-221 00 Lund, Sweden .
    Samuelson, L.
    Solid State Physics/The Nanometer Structure Consortium, Lund University, Box 118, SE-221 00 Lund, Sweden.
    Pettersson, H.
    Solid State Physics/The Nanometer Structure Consortium, Lund University, Box 118, SE-221 00 Lund, Sweden;Dept. of Mathematics, Physics and Electrical Engineering, Halmstad University, Box 823, SE-301 18, Halmstad, Sweden .
    Magnetoresistance in Mn ion-implanted GaAs:Zn nanowires2014Ingår i: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 104, s. Article ID: 153112-Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We have investigated the magnetoresistance (MR) in a series of Zn doped (p-type) GaAs nanowires implanted with different Mn concentrations. The nanowires with the lowest Mn concentration (~0.0001%) exhibit a low resistance of a few kΩ at 300K and a 4% positive MR at 1.6K, which can be well described by invoking a spin-split subband model. In contrast, nanowires with the highest Mn concentration (4%) display a large resistance of several MΩ at 300K and a large negative MR of 85% at 1.6K. The large negative MR is interpreted in terms of spin-dependent hopping in a complex magnetic nanowire landscape of magnetic polarons, separated by intermediate regions of Mn impurity spins. Sweeping the magnetic field back and forth for the 4% sample reveals a hysteresis that indicates the presence of a weak ferromagnetic phase. We propose co-doping with Zn to be a promising way to reach the goal of realizing ferromagnetic Ga1-xMnxAs nanowires for future nanospintronics.

  • 339.
    Pavlov, Anton
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Särnholm, Jonathan
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Ramverk för temperaturstyrning i Matlab: Programmering av DAQ , datalogger,temperaturskåp och spänningsaggregat2016Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Examensarbetet utfördes på Calmon. Ett Ramverket för instrumenten:DA/AD - Modul, datalogger, klimatkammare och nätaggregat skapades medhjälp av programmet Matlab. Arbetet utfördes med hjälp av programmeringi syfte att kunna genomföra mätningar på föremål i klimatkammaren.Kommandon för styrning av instrumenten implementerades. För att vägledaanvändaren utvecklades en specifikation och ett exempelprogram.

    Ladda ner fulltext (pdf)
    RamverkMatlab
  • 340.
    Peng, Su
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Design and analysis of FIR filters based on Matlab2013Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [en]

    In digital control system, interference, which is mixed in the input signal, has a great influence on the performance of the system. Therefore, processing of input signal has to be done to get useful signal. Finite impulse response (FIR) filter plays an important role in the processing of digital signal. Designing the FIR filter by Matlab can simplify the complicated computation in simulation and improve the performance. By using the methods of window function, frequency sampling and convex optimization techniques, the design of FIR filter has been processed by Matlab. In the view of the designed program of Matlab and I can get the amplitude-frequency characterization. By using the FIR digital filters which have been designed to process the input signal based on the Matlab function, the filtering effect of different digital filters is analyzed by comparing the signal’s amplitude-frequency diagrams which have been generated. The experimental results show that the FIR filters designed in this paper are effective.

    Ladda ner fulltext (pdf)
    fulltext
  • 341.
    Perez de Arenaza, Ane
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Analysis of computers for controlling a laundry network system2019Självständigt arbete på avancerad nivå (masterexamen), 40 poäng / 60 hpStudentuppsats (Examensarbete)
    Abstract [en]

    This document describes the work for the master’s thesis in Electrical Engineering carried out at Electrolux Laundry Systems. In this project the computers that control the laundry system have been compared in order to verify the performance of the whole system. Three real environment systems are analysed and two of these systems have been set up in the laboratory in order to solve the problem considered. The results show that the tested devices perform better than the device PC1, which is not fulfilling the expectations in the real environment system. Some conclusions and future work are presented. 

    Ladda ner fulltext (pdf)
    Analysis of computers for controlling a laundry network system
  • 342.
    Perninge, Magnus
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    A finite horizon optimal switching problem with memory and application to controlled SDDEs2019Ingår i: Mathematical Methods of Operations Research, ISSN 1432-2994, E-ISSN 1432-5217, s. 1-36Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We consider an optimal switching problem where the terminal reward depends on the entire control trajectory. We show existence of an optimal control by applying a probabilistic technique based on the concept of Snell envelopes. We then apply this result to solve an impulse control problem for stochastic delay differential equations driven by a Brownian motion and an independent compound Poisson process. Furthermore, we show that the studied problem arises naturally when maximizing the revenue from operation of a group of hydro-power plants with hydrological coupling.

  • 343.
    Perninge, Magnus
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    A limited-feedback approximation scheme for optimal switching problems with execution delays2018Ingår i: Mathematical Methods of Operations Research, ISSN 1432-2994, E-ISSN 1432-5217, Vol. 87, nr 3, s. 347-382Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We consider a type of optimal switching problems with non-uniform execution delays and ramping. Such problems frequently occur in the operation of economical and engineering systems. We first provide a solution to the problem by applying a probabilistic method. The main contribution is, however, a scheme for approximating the optimal control by limiting the information in the state-feedback. In a numerical example the approximation routine gives a considerable computational performance enhancement when compared to a conventional algorithm.

  • 344.
    Perninge, Magnus
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    A Numerical Approximation Scheme for Large-Scale Optimal Switching Problems with Reaction Delays2018Ingår i: 2018 IEEE CONFERENCE ON DECISION AND CONTROL (CDC), IEEE, 2018, s. 5807-5812Konferensbidrag (Refereegranskat)
    Abstract [en]

    We consider stochastic optimal switching problems with reaction delays and propose an approximation technique that decreases the computational complexity. In a numerical example the approximation routine gives a considerable computational performance enhancement when compared to a conventional algorithm.

  • 345.
    Perninge, Magnus
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    A two-scale scheme for finite horizon switching problems with delays2020Ingår i: Automatica, ISSN 0005-1098, E-ISSN 1873-2836, Vol. 112, s. 1-9, artikel-id 108709Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We consider the problem where an operator of n production units acts by turning off and on the units to track a stochastic demand. We investigate the situation when the running cost depends on the time that each unit has been in operation, covering, for example, the case when there are delays in the control response. In this setting, standard methods for numerical solution quickly become intractable as $n$ increases. To resolve this we propose a numerical scheme where delay states are discretized with a different step size than that of the time line. We first show that the value function converges to the optimum as the step size goes to zero. We then show, by a counter-example, that the corresponding control does not necessarily converge to an optimal control for the original problem and propose a perturbation that resolves this issue.

  • 346.
    Perninge, Magnus
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    On the Finite Horizon Optimal Switching Problem with Random Lag2020Ingår i: Applied mathematics and optimization, ISSN 0095-4616, E-ISSN 1432-0606Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We consider an optimal switching problem with random lag and possibility of component failure. The random lag is modeled by letting the operation mode follow a regime switching Markov-model with transition intensities that depend on the switching mode. The possibility of failures is modeled by having absorbing components. We show existence of an optimal control for the problem by applying a probabilistic technique based on the concept of Snell envelopes.

  • 347.
    Perninge, Magnus
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Eriksson, Robert
    Swedish National Grid.
    Frequency Control in Power Systems Based on a Regulating Market2018Ingår i: IEEE Transactions on Control Systems Technology, ISSN 1063-6536, E-ISSN 1558-0865, Vol. 26, nr 1, s. 27-37Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In power systems, the system frequency is a good indicator of the networks resilience to major disturbances. In many deregulated markets, eg the Nordic power market, the system operator controls the system frequency manually by calling off bids handed in to a market, called the regulating market. In this paper, we formulate the problem of optimal bid call-off on the regulating market that the system operator is faced with each operating period, as an optimal starting problem with delays. As general optimal starting problems with delays are computationally cumbersome, we present two alternative approximation schemes. First, we make simplifications to the problem that renders classical solution concepts tractable; then, in a second approach, we define a suboptimal solution scheme, based on limiting the feedback information.

  • 348.
    Perninge, Magnus
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Eriksson, Robert
    Swedish National Grid.
    Market based Frequency Control in Power Systems: The Multi-Period Problem2018Ingår i: IFAC Papersonline: 10th IFAC Symposium on Control of Power and Energy Systems CPES 2018 Tokyo, Japan, 4–6 September 2018, Elsevier, 2018, Vol. 51, nr 28, s. 468-473Konferensbidrag (Refereegranskat)
    Abstract [en]

    The system frequency of a power systems is a good indicator of the networks resilience to major disturbances. The frequency control is generally a multi-layered control structure with primary, secondary and tertiary control. In a completely deregulated setting, for example in the Nordic power system, the system operator controls the system frequency manually by calling-off bids handed in to a market, called the regulating market. In this paper we formulate the problem of optimal bid call-off on the regulating market, that the system operator is faced with each operating period, as a multi-period optimal switching problem with execution delays. (C) 2018, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. All rights reserved.

  • 349.
    Perninge, Magnus
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Eriksson, Robert
    Swedish National Grid.
    Optimal Tertiary Frequency Control in Power Systems with Market-Based Regulation2017Ingår i: IFAC-PapersOnLine, Elsevier, 2017, Vol. 50, s. 4374-4381Konferensbidrag (Refereegranskat)
    Abstract [en]

    The system frequency of a power systems is a good indicator of the networks resilience to major disturbances. In a completely deregulated setting, for example in the Nordic power system, the system operator controls the system frequency manually by calling-off bids handed in to a market, called the regulating market.

    In this paper we formulate the problem of optimal bid call-off on the regulating market, that the system operator is faced with each operating period, as an optimal switching problem with execution delays.

    As general optimal switching problems with execution delays are computationally cumbersome we resort to a recently developed suboptimal solution scheme, based on limiting the feedback information in the control loop.

  • 350.
    Persson, Jonathan
    et al.
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för datavetenskap och medieteknik (DM).
    Richardson, Fabian
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
    Förbättringsarbete av Provdon RA 180/480: "Kommunikation mellan gammalt och nytt"2019Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Detta arbete har genom experiment och tester undersökt förbättringspotentialen för en halvautomatisk grundtillsyn av Ra180. Eftersom att denna grundtillsyn tar lång tid är det högst relevant att försöka korta ner den. Genom noggranna mätningar som har testats har det tagits fram lämpliga lösningar för en påtaglig förbättring. I linje med detta har även en undersökning gjorts av huruvida en helautomatisk grundtillsyn är möjlig. Genom dessa undersökningar har också en hårdvaruprototyp till denna metod tagits fram och implementerats.

    Ladda ner fulltext (pdf)
    Förbättringsarbete av Provdon RA 180/480
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