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  • 301. Dam, B
    et al.
    Granqvist, CG
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Pemble, M
    Rougier, A
    Preface2015In: Solar Energy Materials and Solar Cells, ISSN 0927-0248, E-ISSN 1879-3398, Vol. 143, p. 591-Article in journal (Refereed)
  • 302.
    de la Torre, Teresa Zardan Gomez
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials.
    Strömberg, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials.
    Göransson, Jenny
    Gunnarsson, Klas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Nilsson, Mats
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Immunology, Genetics and Pathology, Molecular tools.
    Svedlindh, Peter
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Strømme, Maria
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials.
    Molecular diagnostics using magnetic nanobeads2010In: / [ed] Goll G., Lohneysen H.V., Loidl A., Pruschke T., Richter M., Schultz L., Surgers C., Wosnitza J, 2010, Vol. 200, p. 122011-Conference paper (Refereed)
    Abstract [en]

    In this paper, we investigate the volume-amplified magnetic nanobead detection assay with respect to bead size, bead concentration and bead oligonucleotide surface coverage in order to improve the understanding of the underlying microscopic mechanisms. It has been shown that: (i) the immobilization efficiency of the beads depends on the surface coverage of oligonucleotides, (ii) by using lower amounts of probe-tagged beads, detection sensitivity can be improved and (iii) using small enough beads enables both turn-off and turn-on detection. Finally, biplex detection was demonstrated.

  • 303. De Toro, J. A.
    et al.
    Lee, S. S.
    Mathieu, Roland
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Normile, P. S.
    Salazar, D.
    Cheong, J. L.
    Muñiz, P.
    Riveiro, J. M.
    Hillenkamp, M.
    Tamion, A.
    Tournus, F.
    Nordblad, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Ideal superspin glass behaviour in a random-close-packed ensemble of maghemite nanoparticles2014In: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 521, no 1, p. 012011-Article in journal (Refereed)
  • 304. De Toro, J. A.
    et al.
    Lee, S. S.
    Salazar, D.
    Cheong, J. L.
    Normile, P. S.
    Muniz, P.
    Riveiro, J. M.
    Hillenkamp, M.
    Tournus, F.
    Tamion, A.
    Nordblad, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    A nanoparticle replica of the spin-glass state2013In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 102, no 18, p. 183104-Article in journal (Refereed)
    Abstract [en]

    A simple single-phase material, a random close-packed (volume fraction 67%) ensemble of highly monodisperse bare maghemite (gamma-Fe2O3) nanoparticles, is shown to exhibit ideal superspin-glass behavior (mimicking that of model spin-glasses), namely, an unprecedentedly sharp onset of the absorption component of the ac susceptibility, narrow memory dips in the zero-field-cooled magnetization and a spin-glass characteristic field-dependence of the magnetic susceptibility. This ideal behavior is attributed to the remarkably narrow dispersion in particle size and to the highly dense and spatially homogeneous configuration ensured by the random close-packed arrangement. This material is argued to constitute the closest nanoparticle analogue to a conventional (atomic) magnetic state found to date. 

  • 305. De Toro, Jose A.
    et al.
    Normile, Peter S.
    Lee, Su Seong
    Salazar, Daniel
    Cheong, Jian Liang
    Muniz, Pablo
    Riveiro, Jose M.
    Hillenkamp, Matthias
    Tournus, Florent
    Tamion, Alexandre
    Nordblad, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Controlled Close-Packing of Ferrimagnetic Nanoparticles: An Assessment of the Role of Interparticle Superexchange Versus Dipolar Interactions2013In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 117, no 19, p. 10213-10219Article in journal (Refereed)
    Abstract [en]

    The fundamental question as to the relative importance of interparticle superexchange versus dipolar interaction between oxide magnetic particles in direct physical contact is addressed by examining the magnetic. properties of a series of compacted samples comprising identical maghemite particles (8 nm in diameter) coated by nonmagnetic shells (oleic acid or silica) of varying thickness that control the distance between the magnetic cores and hence the packing density (particle volume fraction). A remarkably narrow maghemite particle size distribution is established by electron microscopy and small-angle X-ray scattering. The series includes a sample made up of bare particles in a random-close-packed configuration (therefore in direct contact) that exhibits ideal superspin-glass behavior with a relatively high freezing transition temperature. It is shown that interparticle superexchange interactions between the nanoparticles in this sample play a minor role compared to classical dipolar interactions in establishing the collective, superspin-glass state. This follows from the freezing temperature of the most concentrated samples in the series (those with 0 <= shell thickness < 3 nm), which are found to vary in direct proportionality with the volume fraction of the maghemite cores and therefore with the strength of dipolar interactions.

  • 306.
    De Toro, José A.
    et al.
    Univ Castilla La Mancha, IRICA, E-13071 Ciudad Real, Spain.;Univ Castilla La Mancha, Dept Fis Aplicada, E-13071 Ciudad Real, Spain.
    Vasilakaki, Marianna
    NCSR Demokritos, Inst Nanosci & Nanotechnol, Athens 15310, Greece.
    Lee, Su Seong
    Inst Bioengn & Nanotechnol, 31 Biopolis Way, Singapore 138669, Singapore.
    Andersson, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Normile, Peter S.
    Univ Castilla La Mancha, IRICA, E-13071 Ciudad Real, Spain.;Univ Castilla La Mancha, Dept Fis Aplicada, E-13071 Ciudad Real, Spain.
    Yaacoub, Nader
    Univ Maine, CNRS, UMR 6283, Inst Mol & Mat Mans, F-72085 Le Mans, France.
    Murray, Peyton
    Univ Calif Davis, Dept Phys, Davis, CA 95616 USA.
    Sanchez, Elena H.
    Univ Castilla La Mancha, IRICA, E-13071 Ciudad Real, Spain.;Univ Castilla La Mancha, Dept Fis Aplicada, E-13071 Ciudad Real, Spain.
    Muñiz, Pablo
    Univ Castilla La Mancha, IRICA, E-13071 Ciudad Real, Spain.;Univ Castilla La Mancha, Dept Fis Aplicada, E-13071 Ciudad Real, Spain.
    Peddis, Davide
    CNR, Ist Struttura Mat, I-00015 Monterotondo Scale, RM, Italy.
    Mathieu, Roland
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Liu, Kai
    Univ Calif Davis, Dept Phys, Davis, CA 95616 USA.
    Geshev, Julian
    Univ Fed Rio Grande do Sul, Inst Fis, BR-91501970 Porto Alegre, RS, Brazil.
    Trohidou, Kalliopi N.
    NCSR Demokritos, Inst Nanosci & Nanotechnol, Athens 15310, Greece.
    Nogués, Josep
    CSIC, Catalan Inst Nanosci & Nanotechnol ICN2, Campus UAB, Barcelona 08193, Spain.;Barcelona Inst Sci & Technol, Campus UAB, Barcelona 08193, Spain.;ICREA, Pg Lluis Co 23, Barcelona 08010, Spai.
    Remanence Plots as a Probe of Spin Disorder in Magnetic Nanoparticles2017In: Chemistry of Materials, ISSN 0897-4756, E-ISSN 1520-5002, Vol. 29, no 19, p. 8258-8268Article in journal (Refereed)
    Abstract [en]

    Remanence magnetization plots (e.g., Henkel or delta M plots) have been extensively used as a straightforward way to determine the presence and intensity of dipolar and exchange interactions in assemblies of magnetic nanoparticles or single domain grains. Their evaluation is particularly important in functional materials whose performance is strongly affected by the intensity of interparticle interactions, such as patterned recording media and nanostructured permanent magnets, as well as in applications such as hyperthermia and magnetic resonance imaging. Here, we demonstrate that delta M plots may be misleading when the nanoparticles do not have a homogeneous internal magnetic configuration. Substantial dips in the delta M plots of gamma-Fe2O3 nanoparticles isolated by thick SiO2 shells indicate the presence of demagnetizing interactions, usually identified as dipolar interactions. results, however, demonstrate that it is the inhomogeneous spin structure of the nanoparticles, as most clearly evidenced by Mossbauer measurements, that has a pronounced effect on the delta M plots, leading to features remarkably similar to those produced by dipolar interactions. X-ray diffraction results combined with magnetic characterization indicate that this inhomogeneity is due to the presence of surface structural (and spin) disorder. Monte Carlo simulations unambiguously corroborate the critical role of the internal magnetic structure in the delta M plots. Our findings constitute a cautionary tale on the widespread use of remanence plots to assess interparticle interactions as well as offer new perspectives in the use of Henkel and delta M plots to quantify the rather elusive inhomogeneous magnetization states in nanoparticles.

  • 307.
    Delczeg-Czirjak, E. K.
    et al.
    Applied Materials Physics, Dept of Materials Science and Engineering, KTH, Stockholm.
    Gercsi, Z.
    Dept of Physics, Blackett Laboratory, Imperial College London, UK.
    Bergqvist, L.
    Applied Materials Physics, Dept of Materials Science and Engineering, KTH, Stockholm.
    Eriksson, Olle
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
    Szunyogh, L.
    Dept of Theoretical Physics and Condensed Matter Research Group of The Hungarian Academy of Sciences, Budapest University of Technology and Economics, Ungern.
    Nordblad, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Johansson, Börje
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
    Vitos, Levente
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
    Magnetic exchange interactions in B-, Si-, and As-doped Fe2P from first-principles theory2012In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 85, no 22, p. 224435-Article in journal (Refereed)
    Abstract [en]

    Di-iron phosphide (Fe2P) is a parent system for a set of magnetocaloric materials. Although the magnetic ordering temperature (T-C = 215 K) of the stoichiometric composition is too low for room-temperature magnetic refrigeration, the partial replacement of P with B, Si, or As elements results in a steep increase in the magnetic ordering temperature. Doping leads to different equilibrium volumes and hexagonal axial ratios (c/a) within the same crystallographic phase over a wide concentration range. Here, using first principles theory, we decompose the change in the total magnetic exchange interaction upon doping into chemical and structural contributions, the latter including the c/a-ratio and volume effects. We demonstrate that for the investigated alloys the structural effect can be ascribed mainly to the decrease in the c/a ratio that strengthens the magnetic exchange interactions between the two Fe sublattices.

  • 308. Ding, Bangfu
    et al.
    Qian, Haijiao
    Han, Chao
    Zhang, Junying
    Lindquist, Sten-Eric
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Wei, Bin
    Tang, Zilong
    Oxygen Vacancy Effect on Photoluminescence Properties of Self-Activated Yttrium Tungstate2014In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 118, no 44, p. 25633-25642Article in journal (Refereed)
    Abstract [en]

    A series of single-phase yttrium tungstate powders were synthesized through solid-state reaction under air or argon atmosphere. All powders showed broad band emission in the visible light region, and the argon-calcined samples presented strong near-infrared luminescence. Moreover, the long-wave excitation bands peaking at 340, 378, 380, 490, and 523 nm depended critically on the calcination atmosphere and temperature. The emergence of these new excitation bands was ascribed to different oxygen vacancy concentrations with the analysis of the first-principle calculation, Raman and X-ray absorption fine structure spectra. The oxygen vacancies caused the reduction of the average coordination number of tungsten, and the position of the localized energy band changed with the oxygen vacancy concentration. Finally, a schematic photoluminescence excitation model was proposed via anion and cation charge transfer. The obtained results promise to be very useful in interpreting self-activated tungstate luminescence mechanism. They can also serve as guide line for tuning the luminescence performance of yttrium tungstate and related materials.

  • 309.
    Diouani, Mohamed Fethi
    et al.
    Inst Pasteur Tunis, LR11IPT03, LEMV, Tunis 1002, Tunisia;Univ Tunis El Manar, Tunis 1068, Tunisia.
    Ouerghi, Oussama
    Prince Sattam Bin Abdulaziz Univ, Al Kahrj 11942, Saudi Arabia;Univ Tunis El Manar, Tunis 1068, Tunisia.
    Belgacem, Kamel
    Inst Pasteur Tunis, LR11IPT03, LEMV, Tunis 1002, Tunisia.
    Sayhi, Maher
    Inst Pasteur Tunis, LR11IPT03, LEMV, Tunis 1002, Tunisia;Univ Tunis El Manar, Tunis 1068, Tunisia.
    Ionescu, Radu
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Laouini, Dhafer
    Univ Tunis El Manar, Tunis 1068, Tunisia;Inst Pasteur Tunis, LR11IPT02, LTCII, Tunis 1002, Tunisia.
    Casein-Conjugated Gold Nanoparticles for Amperometric Detection of Leishmania infantum2019In: Biosensors, ISSN 2079-6374, Vol. 9, no 2, article id 68Article in journal (Refereed)
    Abstract [en]

    Sensitive and reliable approaches targeting the detection of Leishmania are critical for effective early diagnosis and treatment of leishmaniasis. In this frame, this paper describes a rapid quantification assay to detect Leishmania parasites based on the combination of the electrocatalytic ability of gold nanoparticles (AuNPs) to act as a catalyst for the hydrogen formation reaction along with the specificity of the interaction between casein and the major surface protease of the Leishmania parasite, GP63. First, pure and casein-modified AuNPs were prepared and characterized by scanning electron microscopy and ultraviolet-visible spectroscopy. Then, casein-conjugated AuNPs were incubated with Leishsmania parasites in solution; the formed complex was collected by centrifugation, treated by acidic solution, and the pelleted AuNPs were placed on screen-printed carbon electrodes (SPCEs) and chronoamperometric measurements were carried out. Our results suggest that it is possible to detect Leishmania parasites, with a limit less than 1 parasite/mL. A linear response over a wide concentration interval, ranging from 2 x 10(-2) to 2 x 10(5) parasites/mL, was achieved. Additionally, a pretreatment of Leishmania parasites with Amphotericin B, diminished their interaction with casein. This findings and methodology are very useful for drug efficacy assessment.

  • 310.
    DJURBERG, C
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    GRANBERG, P
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    MATTSON, J
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    NORDBLAD, P
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    OVERLAP LENGTH IN SPIN-GLASSES IMPOSED BY MAGNETIC-FIELD PERTURBATIONS1994In: Physical Review B Condensed Matter, ISSN 0163-1829, E-ISSN 1095-3795, Vol. 50, p. 15775-15778Article in journal (Refereed)
  • 311.
    DJURBERG, C
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    MATTSSON, J
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    NORDBLAD, P
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    REMANENT MAGNETIZATION IN THE DILUTED ISING ANTIFERROMAGNET FE0.6ZN0.4F21994In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 75, p. 5541-5543Article in journal (Refereed)
    Abstract [en]

    The field, H less-than-or-equal-to 5 T, and temperature, T greater-than-or-equal-to 2 K, dependence of the remanent magnetization mu of the diluted Ising antiferromagnet Fe0.6Zn0.4F2 has been investigated utilizing a superconducting quantum interference device magnetometer. The results at low temperatures, where there is no growth of random field domains after the field removal, are analyzed according to mu = AH(x)(T ln t/t0)-PSI + B, where the two terms are domain wall and volume contributions to the remanent magnetization, respectively. It is found that PSI decreases continuously with decreasing temperature, and reaches a value of almost-equal-to 0.15 at 3 K. The field exponent x is found to decrease with increasing temperature, attaining values between 2 and 3. The results show a more complex behavior of the low-temperature remanent magnetization than a model proposed by Nattermann and Vilfan which predicts constant values of the exponents: PSI almost-equal-to 0.4 and x almost-equal-to 2.

  • 312.
    DJURBERG, C
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    MATTSSON, J
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    NORDBLAD, P
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    STUBI, R
    COWEN, JA
    RELAXATION OF THE FIELD COOLED MAGNETIZATION IN 2D CU(MN) FILMS1994In: Physica. B, Condensed matter, ISSN 0921-4526, E-ISSN 1873-2135, Vol. 194, p. 303-304Article in journal (Refereed)
    Abstract [en]

    The relaxation of the field cooled magnetisation of a multilayered 2D Cu(Mn) spin glass film has been investigated in a SQUID-magnetometer. The sample is cooled in a constant magnetic field (10 Oe) from a high temperature, where the magnetisation is at equilibrium, to a temperature below the freezing temperature, T(f). At constant temperature, the magnetisation is then found to increase with time at temperatures near T(f), showing an initial decrease followed by an increase at long time scales at intermediate temperatures and only decreases with time at lower temperatures. The behaviour, including the surprising downward relaxation away from the thermodynamic equilibrium magnetisation, is qualitatively interpreted in terms of a spin glass domain model.

  • 313.
    Djärv, Oskar
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Åtgärdsplan för energieffektiviseringav ett flerbostadshus från 1940-talet: En fallstudie av Vindelgatan 15 i Ludvika2015Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    A housing association in Ludvika owns an apartment building built 1942 with a heating system based on district heating. The housing association is interested in reducing their annual energy cost, which corresponds to reducing their energy consumption. The yearly energy consumption for the building at the moment is about 40 % above the average for Swedish apartment buildings. This report investigates the possibilities of reducing the total energy consumption for the building, in a profitable way, and at the same time meeting the governmental targets for 2050 and the maximum specific energy demand for new buildings presented by the building regulation.

    The method used in this report was to conduct simulations of models of the building where proposals in terms of reducing the use of heat were evaluated. The proposals were related to the ventilation system, the building envelope, and solar power installations.

    The simulations returned results of many proposals that could reduce the energy consumption, but just a few turned out to be financially viable. Installing an exhaust air heat pump in combination with solar panels for heat supply and solar cells for electricity was found to be the most viable solution.

    A combination of these three proposals was calculated to reduce the yearly heat consumption with 188 MWh and the total energy consumption by 50 %, which meets the 2050 target. The specific energy consumption of the building per square meter of heated area is 97 kWh, which means that the maximum specific energy demand of 110 kWh is met. 

  • 314.
    Donolato, M
    et al.
    Department of Micro- and Nanotechnology, Technical University of Denmark, DTU Nanotech, Kongens Lyngby, Danmark, och L-NESS, Dipartimento di Fisica, Politecnico di Milano, Como, Italien.
    Dalslet, B T
    Department of Micro- and Nanotechnology, Technical University of Denmark, DTU Nanotech, Kongens Lyngby, Danmark.
    Damsgaard, C D
    Department of Micro- and Nanotechnology, Technical University of Denmark, DTU Nanotech, Kongens Lyngby, Danmark.
    Gunnarsson, Klas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Jacobsen, C S
    Department of Physics, Technical University of Denmark, DTU Physics, Kongens Lyngby, Danmark.
    Svedlindh, Peter
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Hansen, Mikkel F
    Department of Micro- and Nanotechnology, Technical University of Denmark, DTU Nanotech, Kongens Lyngby, Danmark.
    Size-dependent effects in exchange-biased planar Hall effect sensor crosses2011In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 109, no 6, p. 064511-Article in journal (Refereed)
    Abstract [en]

    Exchange-biased planar Hall effect magnetic field sensor crosses with arm width w have been studied as function of w. For large values of w, the magnetic behavior is hysteresis-free and follows the single domain Stoner-Wohlfarth model. When w is decreased, hysteresis is observed in the sensor response. For intermediate values of w, the magnetization reversal takes place in two steps, and for small values of w, the magnetization reversal takes place in a single step. Based on electrical measurements, magnetic force microscopy, and micromagnetic simulations, the observations are explained by an increasing magnetic shape anisotropy of the arms of the cross. We propose a simple analytical model that captures the essential physics of the observations and parameterizes the effects of the cross-shape on the central part of the cross.

  • 315.
    Donolato, Marco
    et al.
    Department of Micro- and Nanotechnology, Technical University of Denmark, DTU Nanotech.
    Antunes, Paula
    Department of Micro- and Nanotechnology, Technical University of Denmark, DTU Nanotech.
    Stjernberg Bejhed, Rebecca
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Zardán Gómez de la Torre, Teresa
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials.
    W. Østerberg, Frederik
    Department of Micro- and Nanotechnology, Technical University of Denmark, DTU Nanotech.
    Strömberg, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Nilsson, Mats
    Science for Life Laboratory, Department of Biochemistry and Biophysics, Stockholm University.
    Strömme, Maria
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials.
    Svedlindh, Peter
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    F. Hansen, Mikkel
    Department of Micro- and Nanotechnology, Technical University of Denmark, DTU Nanotech.
    Vavassori, Paolo
    CIC nanoGUNE Consolider, San Sebastian, Spain.
    Novel readout method for molecular diagnostic assays based on optical measurements of magnetic nanobead dynamics2015In: Analytical Chemistry, ISSN 0003-2700, E-ISSN 1520-6882, Vol. 87, no 3, p. 1622-1629Article in journal (Refereed)
    Abstract [en]

    We demonstrate detection of DNA coils formed from a Vibrio cholerae DNA target at picomolar concentrations using a novel optomagnetic approach exploiting the dynamic behavior and optical anisotropy of magnetic nanobead (MNB) assemblies. We establish that the complex second harmonic optical transmission spectra of MNB suspensions measured upon application of a weak uniaxial AC magnetic field correlate well with the rotation dynamics of the individual MNBs. Adding a target analyte to the solution leads to the formation of permanent MNB clusters, namely, to the suppression of the dynamic MNB behavior. We prove that the optical transmission spectra are highly sensitive to the formation of permanent MNB clusters and, thereby to the target analyte concentration. As a specific clinically relevant diagnostic case, we detect DNA coils formed via padlock probe recognition and isothermal rolling circle amplification and benchmark against a commercial equipment. The results demonstrate the fast optomagnetic readout of rolling circle products from bacterial DNA utilizing the dynamic properties of MNBs in a miniaturized and low-cost platform requiring only a transparent window in the chip.

  • 316. Donolato, Marco
    et al.
    Bejhed, Rebecca
    Zardán Gómez de la Torre, Teresa
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials.
    Österberg, Frederik
    Strömberg, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Nilsson, Mats
    Strömme, Maria
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials.
    Svedlindh, Peter
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Vavassori, P.
    Molecular diagnostics based on clustering dynamics of magnetic nanobeads2014In: 14th Anniversary World Congress on Biosensors (Biosensors 2014)., 2014Conference paper (Refereed)
  • 317.
    Donolato, Marco
    et al.
    BluSense Diagnostics, Copenhagen, Denmark.
    Bosco, Filippo
    BluSense Diagnostics, Copenhagen, Denmark.
    Strömberg, Mattias
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Tian, Bo
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Point-of-care quantitative diagnostics of Dengue and Zika using magneticnanoparticles2016Conference paper (Refereed)
  • 318.
    Donzel-Gargand, Olivier
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
    Larsson, Fredrik
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
    Törndahl, Tobias
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
    Stolt, Lars
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics. Solibro Research AB.
    Edoff, Marika
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
    Surface Modification And Secondary Phase Formation From a High Dose KF-Post Deposition Treatment of (Ag,Cu)(In,Ga)Se2 Solar Cell AbsorbersManuscript (preprint) (Other academic)
    Abstract [en]

    In this study we assessed the potential of KF-Post Deposition Treatment (PDT) performed on a silver-alloyed Cu(Inx,Ga1-x)Se2 (ACIGS) solar absorber. ACIGS absorbers with Ag/Ag+Cu ratio (Ag/I) close to 20% were co-evaporated on a Mo-coated glass substrate and exposed to in-situ KF-PDT of various intensities. The current-voltage characteristics indicated that an optimized PDT can be beneficial, increasing in our study the median Voc and efficiency values by +48 mV and +0.9 %abs (from 728 mV and 16.1 % efficiency measured for the sample without PDT), respectively. However, an increased KF-flux during PDT resulted in a net deterioration of the performance leading to median Voc and efficiency values as low as 503 mV and 4.7 %. The chemical composition analysis showed that while the reference absorber without any PDT was homogeneous, the KF-PDT induced a clear change within the first 10 nm from the surface. Here, the surface layer composition was richer in K and In with an increased Ag/I ratio, and its thickness seemed to follow the KF exposure intensity. Additionally, high-dose KF-PDT resulted in substantial formation of secondary phases for the ACIGS. The secondary phase precipitates were also richer in Ag, K and In, and Electron and X-ray diffraction data match with the monoclinic C 1 2/c 1 space group adopted by the Ag-alloyed KInSe2 (AKIS) phase. It could not be concluded whether the performance loss for the solar cell devices originated from the thicker surface layer or the presence of secondary phases, or both for the high-dose KF-PDT sample.

  • 319.
    Ederth, J
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Hultåker, A
    Niklasson, G A
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics. Fasta tillståndets fysik.
    Heszler, P
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics. Fasta tillståndets fysik.
    van Doorn, A R
    Jongerius, M J
    Burgard, D
    Granqvist, C G
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics. Fasta tillståndets fysik.
    Thin Porous Indium Tin Oxide Nanoparticle Films: Effects of Annealing in Vacuum and Air2005In: Appl. Phys., Vol. A 81, p. 1363-1368Article in journal (Refereed)
  • 320.
    Ederth, Jesper
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Solid State Physics. fasta tillståndets fysik.
    Hoel, Anders
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Solid State Physics. fasta tillståndets fysik.
    Niklasson, G.A.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Solid State Physics. fasta tillståndets fysik.
    Granqvist, C.G.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Solid State Physics. fasta tillståndets fysik.
    Small Polaron Formation in Porous WO3-x Nanoparticle Films2004In: J Applied Physics, Vol. 96, p. 5722-5726Article in journal (Refereed)
  • 321. Ederth, Jesper
    et al.
    Smulko, J M
    Kish, Laszlo B
    Heszler, Peter
    Granqvist, Claes G
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics. Fasta tillståndets fysik.
    Comparison of Classical and Fluctuation-Enhanced Gas Sensing with PdxWO3 Nanoparticle Films2006In: Sensors Actuators, no B 113, p. 310-315Article in journal (Refereed)
  • 322.
    Ederth, Jesper
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics. Fasta tillståndets fysik.
    Smulko, J.M.
    Kish, Laszlo
    Heszler, Peter
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics. Fasta tillståndets fysik.
    Niklasson, Gunnar
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics. fasta tillståndets fysik.
    Gas Sensing by Resistance Fluctuations in PdxWO3 Nanoparticle Films2004In: Soc. Photo-Opt. Instrum. Engr. 5472, 2004, p. 191-199Conference paper (Refereed)
  • 323.
    Ederth, Jesper
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics. fasta tillståndets fysik.
    Smulko, J.M.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Kish, Laszlo
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Heszler, Peter
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics. fasta tillståndets fysik.
    Niklasson, Gunnar
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics. fasta tillståndets fysik.
    Highly Sensitive and Selective WO3 Nanoparticle Gas Sensor Operating in Thermally Modulated Dynamic Mode2004In: Proc IME-6, International Meeting on Electrochromism, Brno, Czech, 2004Conference paper (Refereed)
  • 324.
    Edholm, Bengt
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Olsson, Jörgen
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
    Söderbärg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
    Very High Current Gain Enhancement by Substrate Biasing of Lateral Bipolar Transistors on Thin SOI1993In: Infos, 1993Conference paper (Refereed)
  • 325.
    Edström, Kristina
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.
    Pan, Ruijun
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Inorganic Chemistry.
    Wang, Zhaouhui
    Nyholm, Leif
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Inorganic Chemistry. Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials.
    Strömme, Maria
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials.
    Separators As a Tool for Enhanced Battery Performance2019In: International Battery Association 2019: Batteries and Energy Storage / [ed] The electrochemical Society, La Jolla, 2019, article id 117872Conference paper (Refereed)
  • 326.
    Edueng, Khadijah
    et al.
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Pharmacy, Department of Pharmacy.
    Bergström, Christel
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Pharmacy, Department of Pharmacy.
    Gråsjö, Johan
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Pharmacy, Department of Pharmacy. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials.
    Mahlin, Denny
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Pharmacy, Department of Pharmacy.
    Long-term physical (in)stability of spray-dried amorphous drugs: relationship with glass-forming ability and physicochemical propertiesManuscript (preprint) (Other academic)
  • 327.
    Edvinsson, Tomas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    A concentrated effort2019In: NATURE ENERGY, ISSN 2058-7546, Vol. 4, no 5, p. 354-355Article in journal (Other academic)
    Abstract [en]

    While recent gains in the efficiency of photoelectrochemical devices for hydrogen production are encouraging, high efficiency is rarely combined with high power output, which is important for large-scale viability. Towards this goal, researchers now demonstrate a promising thermally integrated device driven by concentrated solar irradiation.

  • 328.
    Edvinsson, Tomas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Generering av vätgas från vatten och solljus2018Conference paper (Other (popular science, discussion, etc.))
  • 329.
    Edvinsson, Tomas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    High Performance Materials for Solar Fuel Generation and Pathways to Utilization of IR-Photons2017In: Proceeding, MRS 2017, 2017, p. 05--05, article id ES02.03.05Conference paper (Refereed)
  • 330.
    Edvinsson, Tomas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Lågdimensionella material för generering av solbränsle2017Conference paper (Other academic)
  • 331.
    Edvinsson, Tomas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Optical quantum confinement and photocatalytic properties in two-, one- and zero-dimensional nanostructures2018In: Royal Society Open Science, E-ISSN 2054-5703, Vol. 5, no 9, article id 180387Article in journal (Refereed)
    Abstract [en]

    Low-dimensional nanomaterials have been explored extensively in the last decades, partly fuelled by the new possibilities for tuning and controlling their electronic properties. In a broader perspective within catalysis, two-, one- and zero-dimensional (2D, 1D and 0D) inorganic nanomaterials represent a bridge between the selectivity of molecular catalysts and the high performance and stability of inorganic catalysts. As a consequence of the low dimensions, higher surface areas are obtained but also introduce new physics and increased tuneability of the electronic states in the nanostructured system. Herein, we derive the commonly used equations for optical transitions and carrier confinement in semiconductors and discuss their effect on the optical and photocatalytic properties of direct band and indirect band gap materials. In particular, the physical properties of the optical and photocatalytic properties of Fe2O3 and ZnO will be used to exemplify the effects of the low dimensionality. Carrier confinement effects with changes in the density of states, band gap/shift of band edges will be outlined together with their effects on the tuneability of the material and their wider application as photocatalytic materials.

  • 332.
    Edvinsson, Tomas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Resonant and off-resonant Raman spectroscopy for analysis of solar energy material2017Conference paper (Refereed)
  • 333.
    Ekholm, Victor
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and Condensed Matter Physics.
    Gråsjö, Johan
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Pharmacy, Department of Pharmacy. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials.
    Dong, Minjie
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and Condensed Matter Physics.
    Björneholm, Olle
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and Condensed Matter Physics.
    Såthe, Conny
    Uppsala University.
    Chatzigeorgiou, Evanthia
    Agåker, Marcus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and Condensed Matter Physics.
    Harada, Yoshihisa
    Miyawaki, Jun
    Rubensson, Jan-Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and Condensed Matter Physics. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials.
    Aqueous carbonate and bicarbonate ions studied by RIXS at the O K-edgeManuscript (preprint) (Other academic)
  • 334.
    Ekstrand-Hammarström, Barbro
    et al.
    FOI, Umeå.
    Akfur, Christine
    FOI, Umeå.
    Andersson, Per Ola
    FOI, UMEÅ.
    Lejon, Christian
    FOI, Umeå.
    Österlund, Lars
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Buch, Anders
    FOI, Umeå.
    Human Primary Bronchial Epithelial Cells are more Responsive to Titanium Dioxide Nanoparticles than the Lung Epithelial Cell Lines A549 and BEAS-2B2012In: Nanotoxicology, ISSN 1743-5390, E-ISSN 1743-5404, Vol. 6, no 6, p. 623-634Article in journal (Refereed)
    Abstract [en]

    We have compared the cellular uptake and responses of fivepreparations of nanocrystalline titanium dioxide (TiO2) betweennormal human bronchial epithelial (NHBE) cells and epithelialcell lines (A549 and BEAS-2B). The P25 nanoparticles, containingboth anatase and rutile modifications, induced reactive oxygenspecies (ROS) and secretion of the neutrophil chemoattractantIL-8 in all three cell types used. Pure anatase and rutile particlesprovoked differential IL-8 response in A549 and no response inBEAS-2B cells despite similar formation of ROS. The pure TiO2modifications also provoked release of the inflammatorymediators: IL-6, G-CSF and VEGF, in NHBE cells but not in the twocell lines. We conclude that the responsiveness of lung epithelialcells is strongly dependent on both the physicochemicalproperties of TiO2 nanoparticles and the type of responder cells.The differential pro-inflammatory responsiveness of primarylung epithelial cells compared with immortalized cell linesshould be considered in the assessment of adverse reactions toinhaled nanoparticles.

  • 335.
    Ekström, David
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Gotlands solelpotential2012Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The aim of this thesis is to investigate the electric solar potential on the Swedish island Gotland. The Gotlandic habitations have been divided into four house categories. For each category energy demand, roof area, geographic orientation androof tilt have been decided. Solar radiation data have been collected from the Swedish solar radiation model STRÅNG (STRÅNG, 2012).

    The buildings characteristics and the solar radiation have been used as input values in common solar formulas, the solar potential for each building category have been summed up to a total electric solar potential for the region.

    The electric solar potential on Gotland was calculated to 242 GWh/year with solar data from 2010. Gotlands largest city, Visby, is marked as cultural heritage by UNESCO (UNESCO, 2012). The solar potential when buildings in Visby as well as all churches on the island were removed from the equation was 231 GWh/year.

  • 336.
    Ekström, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Elbesparingar i laboratorieintensiva byggnader: En fallstudie av Ångströmlaboratoriet2016Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Energy consumption in buildings is an important matter for thefuture. In order to reach a sustainable future, both new and oldbuildings must become more energy efficient. This thesisinvestigates how the electricity consumption can be reduced inexisting buildings containing laboratories. This project had twomajor goals. The first goal was to find specific actions toimprove the electricity energy efficiency of The ÅngströmLaboratory, Sweden. The Ångström Laboratory is owned andadministered by the public company Akademiska Hus and rented byUppsala University. The second was to propose a procedure of howto make an arbitrary building containing laboratories moreelectricity efficient. The results indicate that a lot of energycan be saved by optimizing the ventilation of the laboratories. Byreplacing the current ventilation fans with more efficient fans,the potential annual savings were calculated to 0.57 GWh whichcorresponds to 4.2 % of the total annual electricity consumption.By reducing the air-flow in the fume hoods outside working hoursthe electricity consumption in the ventilation system can belowered. The potential savings for this were calculated to 0.31GWh (2.3 %). By modifying the ventilation system of the differentcorridors in such a way that laboratories and offices are placedin opposite ends of the corridor, the operation of ventilationfans can be optimized for laboratories and for officesrepectively. The savings for this were calculated to be 0.07 GWhper year (0.5 %). Another identified opportunity for energysavings in the Ångström building is the replacement of currentlighting fixtures with more efficient systems (typically LED basedsystems). This has the potential to save 0.17 GWh per year.

  • 337.
    Elfving, Gustav
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Jansson, Emil
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Modelling extensive solar power production in urban and rural areas2017Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Renewable energy sources, in form of solar power, is a growing source of energy. Not only at an industry level but also at a commercial level. Grid-connected, building-applied solar power has increased rapidly and as the implementation of solar energy grows, so does the importance of being able to evaluate locations that are of interest of installations with respect to its potential production and its impact on the electrical grid.

    In this thesis the energy production for different future scenarios is modelled for BAPV (Building Applied Photovoltaics) in Uppsala and Herrljunga. This is done by using calculation and simulation programs called MATLAB and ArcGIS. The results regarding Uppsala, are used in a report by BEESG (Built Environment Energy Systems Group) at Uppsala University to the Swedish energy agency. The grid impact of installing extensive solar power as concentrated and dispersed in Herrljunga are simulated and evaluated.

    Both authors has during the process been equally involved in all parts of the thesis in order to get a thorough understanding of the project as a whole. This due to the fact that the different parts of the thesis were dependent of each other (the second part could not be finished until the first were completed etc).

  • 338. Ellegård, Kajsa
    et al.
    Vrotsou, Katerina
    Widén, Joakim
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    VISUAL-TimePAcTS/energy use - a software application for visualizing energy use from activities performed2010In: Proceedings of the 3rd International Conference on Energy Systems with IT, Älvsjö, Sweden, March 16-17, 2010, 2010Conference paper (Refereed)
  • 339. Ellegård, Kajsa
    et al.
    Widén, Joakim
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Elanvändning i vardagen: En kunskapsöversikt inom ELAN-programmet2006Report (Refereed)
  • 340.
    Ellegård, Kajsa
    et al.
    Linköping University.
    Widén, Joakim
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Vrotsou, Katerina
    Appliances facilitating everyday life - electricity use derived from daily activities2011In: Proceedings of the World Renewable Energy Congress, Linköping, Sweden, May 8-13, 2011, 2011Conference paper (Refereed)
  • 341.
    Emil, Svensson
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    CFD-simulering av kallras från fönster: Konvektorers och nischdjupets inverkan på lufthastigheter i rummet2014Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    During cold winter days it is likely that people in buildings with older windows or high glass facades experience thermal discomfort due to cold air down draughts. Earlier work has been aimed at finding analytical methods to predict the speed of the airflow in a room and in practice heating appliances are often placed beneath the windows to reduce the draught along the floor. In a study from 2012 Mohammad Parchami developed a method for estimating the required heating power to counteract the downdraught with such heating appliances. In this study, Computational Fluid Dynamics (CFD) was used to evaluate the usefulness of Parchami’s method and also to examine the potential of adapting the depth of the inward window sill as a means of decreasing the down draught. The result suggested that Parchami’s method is in need of certain modifications and further CFD-simulations can be a useful tool to make the method more acceptable to the building profession. Further, it was also shown that an adapted sill depth could considerably reduce the airflow speed in the room and the result indicated that there is an “effective sill depth” at which the airflow speed from the downdraught reaches a minimum. It is likely that this effective sill depth in large part depends on the boundary layer thickness at the window, in which case the constructors are given the alternative to determine the window sill depth by an easy estimation of the boundary layer thickness.

  • 342.
    Engfeldt, Johnny D.
    et al.
    ChromoGenics AB, Uppsala.
    Gregard, Greger
    ChromoGenics AB, Uppsala.
    Niklasson, Gunnar A.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Roos, Arne
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Granqvist, Claes-Göran
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Glazing for Energy Efficient Buildings: The Almost Forgotten Role of Angular-Dependent Solar Transmittance2019In: Society of Vacuum Coaters 2019 Technical Conference Proceedings.: Coatings for Energy Conversion and related Processes, Society of Vacuum Coaters , 2019, article id 0018Conference paper (Refereed)
    Abstract [en]

    Glazing for energy efficient buildings comprises multi-pane units with surface coated glass. According to today’s standards, glazing is characterized by optical measurements at normal light incidence. Here we show that this prerequisite is grossly inadequate for common vertical glazing, in particular regarding solar transmittance and total energy transmittance (g-value). We present data on spectral and angular-dependent transmittance in the 300–2500-nm wavelength range for several types of glass samples with hard (tin-oxide-based) and soft (silver-based) coatings. Furthermore, we use standard procedures to compute g-values for triple-pane glazing embodying such glass and find that the g-value at 60° off-normal angle typically is as low as 65–68% of the g-value for normal incidence. This difference is essential for assessing the energy efficiency of modern buildings and highlights that the glazing’s angularity must be accounted for.

  • 343.
    Ericsson, Tore
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
    Amcoff, Örjan
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Solid Earth Geology.
    Nordblad, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Vacancy ordering in FeTSes-FeTS8 solid solutions studied by Mössbauer, X-ray and magnetization techniques1994In: Hyperfine Interactions, ISSN 0304-3843, E-ISSN 1572-9540, Vol. 90, no 1, p. 515-520Article in journal (Refereed)
    Abstract [en]

    Superstructures, due to cation vacancy ordering, form in the NiAs-related pseudobinary solid solution Fe7Se8-Fe7S8 close to both end compositions (Fe-7(SxSe1-x)(8) with x less than or equal to 0.15 and x greater than or equal to 0.85) during rapid cooling of quartz ampoules from 600 degrees C, according to X-ray diffractometry (XRD) and magnetization (SQUID) measurements. Mossbauer spectroscopy indicates local vacancy ordering in the whole interval, but XRD and SQUID data exclude long-range vacancy ordering when the anion proportion of sulphur is between 15% and 85%.

  • 344. Eriksson, A K
    et al.
    Tran, T
    Saxin, S
    Svensson, G
    Svedlindh, Peter
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Eriksson, S-G
    Knee, C S
    Effets of A-site substitution on the structure and magnetic properties of Bi0.15Sr0.85-yAeyCo1-xFexO3-o2009In: Solid State Sciences, ISSN 1293-2558, E-ISSN 1873-3085, Vol. 11, no 11, p. 1945-1954Article in journal (Refereed)
    Abstract [en]

    The effects of partial substitution of Sr2+ by Ca2+ and Ba2+ on the   A-site of oxygen-deficient perovskites,   Bi(0.15)Sr(0.85-y)Ae(y)Co(1-x)FeO(3-delta), where y = 0.28 for Ae = Ba   and y = 0.17 for Ae = Ca, and 0.0 <= x <= 1.0, have been investigated.   The differing ionic size of the Ca2+ and Ba2+ cations influences both   the crystal structure and the properties of the materials. The smaller   Ca2+ cation favoured formation of an oxygen vacancy ordered perovskite   superstructure (14/mmm, a = 2ap, c = 4a(p)), meanwhile the presence of   the larger Ba2+ cation promoted a disordered simple cubic structure (Pm   (3) over barm, a = ap) that was also found for all Fe containing   samples, i.e. x >= 0.25. The samples were studied with PXRD, NPD, TGA,   electron microscopy and magnetic susceptibility measurements. All   as-prepared samples exhibited long range G-type antiferromagnetic   ordering. The effect of oxygen annealing was dramatic for the   Bi0.15Sr0.68Ca0.17Co1-xFexO3-delta series, with a disappearance of   magnetic order for x >= 0.25 linked to increasing spin-glass   properties. The oxygen content of the   Bi0.15Sr0.57Ba0.28Co1-xFexO3-delta as-prepared materials was generally   higher than their Ca substituted counterparts, and the long range   antiferromagnetic order was more resistant to oxygen annealing.

  • 345.
    Eriksson, Andreas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Metoder för lastprioritering i fjärrvärmecentraler2010Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    A problem in the field of district heating is the oil burners needed to provide power when a peak load occurs. One possible way of reducing the needed amount of oil is to reduce the power demand for space heating in the district-heating substations when the need for district heating water exceeds a certain limit. This can be done by use of a locally working controller function.

    In this Thesis the options concerning load priority are evaluated. To evaluate the potential for using controller functions concerning peak load priority an experiment was brought out in a chosen district-heating substation. The impact on the indoor thermal comfort during a heat reduction was also taken into account. With simulations and mathematical models the building and the indoor air cool down was evaluated. Also a survey was given to the residents to validate how the indoor thermal climate was affected during the experiment. Possible savings by using these kinds of functions were also accounted for.

    The result demonstrates that a simple controller function provides a possible way of reducing the power demand, but is not sufficiently reliable. This is mainly due to the used regulating parameter. With modifications or by adding additional regulating parameters such as water flow into the controller, the functionality can be improved. The result from the survey shows that during the experimental period the residents experienced a minor impact on the thermal comfort. Parameters, such as ventilation and heat losses also have a major impact on the building´s thermal inertia, especially at the lowest occurring outdoor temperatures. The simulations confirm the theory regarding the building heat capacity to prevent a negative impact on indoor thermal comfort. In addition, the indoor air temperature can initially decrease faster than the building framework, especially under the influence of ventilation. This must be taken into account when applying functions for load priority.

    Calculations indicate that the economical benefits by adapting functions for load priority are primarily for the heat-producer, due to reduced oil dependence and also other system aspects. The current ownership structure in Uppsala provides for a possible obstacle when it comes to expanded use of load priority functions. More incentives for the consumer are needed to provide for an increased usage of load priority functions in their district-heating substations.

  • 346. Eriksson, Annika K.
    et al.
    Lindberg, Fredrik
    Svensson, Gunnar
    Svedlindh, Peter
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Henry, Paul F.
    Eriksson, Sten-G.
    Knee, Christopher S.
    Influence of iron addition on the oxygen-deficient Sr0.85Bi0.15Co1-xFexO3-delta (0.0 <= x <= 1.0) perovskites2008In: Journal of Solid State Chemistry, ISSN 0022-4596, E-ISSN 1095-726X, Vol. 181, no 8, p. 2031-2040Article in journal (Refereed)
    Abstract [en]

    A series of oxygen-deficient Sr0.85Bi0.15Co1-xFexO3-delta (0.0 <= x <= 1.0) perovskite phases were prepared using solid-state reaction. Results of neutron powder diffraction analyses show that the introduction of Fe onto the B-site severely effects the long range coherence of the oxygen vacancy ordered, 14/mmm supercell, observed for the x = 0.0 sample. For x = 0.1 a smaller, a = b approximate to a(p), c approximate to 2a(p), P4/mmm supercell gives the best agreement to the diffraction data, whilst phases in the range 0.2 <= x <= 0.6 adopt disordered cubic perovskite structures. Pseudo-cubic, a = b approximate to a(p), c approximate to a(p), structures are found for x >= 0.8. Evidence of weak superstructures, reflecting local oxygen ordering, is also obtained from electron diffraction. For all oxygen-annealed phases the average structure reverts to cubic Pm (3) over barm. The as-prepared samples show G-type antiferromagnetic order at room temperature. The oxygen annealed x = 0.10, 0.25 and 1.0 samples display low-temperature spin-glass transitions.

  • 347.
    Eriksson, Ida
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Pettersson, Lisa
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Nya förutsättningar för elnätsföretagen: Förhandsregleringen 2016-2019 och dess påverkan på nätföretagens verksamhet2016Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    To meet new regulations and the demand for a more sustainable energy system, the electricity grid will play an important role. Since the grid owners operate in a monopoly environment a regulating authority, the Swedish Energy Markets Inspectorate (Ei), sets a revenue cap that determines their profits. Changes were made for the regulating period 2016-2019, which now states that grid operators no longer can charge their customers with already depreciated grid components. To spur the grid operators to invest in smarter and more efficient technology, Ei also introduced two new economic incentives to make companies decrease their electricity losses and use the grid more evenly. The first aim of this thesis was to investigate how this new regulatory framework affected the grid operators, by performing interviews and sending out a survey. The result showed that the new regulatory decreases the grid operators’ profitability and also affects their investment strategies. The age of a grid has become more important than both efficient use of the grid and voltage quality when considering investments, since age now has a major impact on the profits. The new incentives however, has almost no effect on the way the grid operators act. The second aim of this study was to investigate how much a grid operator could save with these new incentives. A case study were conducted at Upplands Energi, a small local grid operator, and calculations with their usage data were performed in MATLAB. The results showed that load management by installing control equipment on costumers’ heat pumps and thereby decreasing their power peaks, could save money. By connecting 500 customers Upplands Energi could save about 150 000 SEK per year, and with 5 000 customers they could save almost half a million SEK per year.

  • 348.
    Eriksson, Johan
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Design of a Vector Network AnalyzerFerroMagnetic Resonance set upand measurements on multilayerHeusler samples2010Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The resonance frequency and the damping constant are interesting parametersrelated to the ferromagnetic spin resonance phenomenon. In this study theseparameters have been investigated for a number of Heusler multilayer film samplesusing a vector network analyzer ferromagnetic resonance setup. The complexsusceptibility of the samples is extracted from the transmittance scattering parameterS12 measured by the network vector analyzer. The ferromagnetic resonance ismirrored by a maximum in the imaginary part of the complex susceptibility. Theagreement between the theoretically calculated resonance frequency and theresonance frequency measured varied between samples. These differences originatefrom several sources, one of them is, the uncertainty in the internal magnetic field.This is due to irregularities and repeated interfaces between each layer in the Heuslersamples.

  • 349.
    Eriksson, Pontus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Elbilens påverkan på elnätet vid hemmaladdning och tekniker för effekttoppsreduktion: En fallstudie på två av Sala-Heby Energis lågspänningsnät2018Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    In order to reach climate goals regarding the reduction ofcarbon dioxide in the environment, the decarbonisation of the transport sector plays a crucial role. Along with this revolution, electric vehicles will most likely be a candidate to replace market shares from gasoline and diesel.

    The deployment of electric cars is now starting to increase, by over 2 millions electrical vehicles running on the streets world wide in year 2016, which is more than the double compared to previous year.

    This master thesis examines home charging and its impact on the distribution grid of two types, one in a smaller urban area and one in a rural area in the Swedish city Sala. Different integration levels of electric vehicles are examined regarding voltage drop, relative loading of conductors and transformers, and the voltage symmetry with charging only on one phase.

    The simulations are made in the NIS-based system dpPower based on charging data from Grahn et.al.(2013), and the study of powerpeaks is made in Matlab with the use of consumption data from customers.

    The results show that the transfomer is the only limitation in the grid of the urban area, which fails at an integration level of 50 percent at 11 kW of charging. Compared to the grid in the rural area which reacts more strongly of home charging. In this case it is most likely to fail at 30 percents integration at 3,7 kW of charging. Also a greater accuracy has to be taken into account here regarding the placing of one phase-chargers at different phases. This in order to not exceed the 2 percent limit of voltage symmetry. With the aim to reduce power peaks, the grid seems to benefit from high demand response and local battery storage, which reduce the power peaks to an extent that could be comparable to reducing the integration level of electric vehicles from 50 to 30 percent.

  • 350. Eriksson, T.
    et al.
    Abdu, Y.A.
    Annersten, H.
    Nordblad, Per
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Solid State Physics. Fasta tillståndets fysik.
    Non-magnetic stainless steels reinvestigated - a small effective field component in external magnetic fields2004In: Hyperfine Interactions, no 156, p. 151-155Article in journal (Refereed)
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