kth.sePublications
Change search
Refine search result
1234567 101 - 150 of 1069
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 101.
    Birgisson, Björn
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Transport Science, Highway and Railway Engineering.
    Sjölander, Peta White
    KTH, School of Technology and Health (STH), Health Systems Engineering, Ergonomics.
    Snickars, Folke
    KTH, School of Architecture and the Built Environment (ABE), Urban Planning and Environment, Urban and Regional Studies.
    Kjellberg, Peter
    KTH.
    Perhson, Susanna
    KTH.
    Eriksson, Thomas
    KTH.
    Reitberger, Göran
    KTH.
    RAE2012: KTH Research Assessment Exercise 20122012Book (Other (popular science, discussion, etc.))
    Download full text (pdf)
    KTH RAE2012
  • 102.
    Bjerke, Lina
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Centres, Centre of Excellence for Science and Innovation Studies, CESIS. Jönköping International Business School, Jönköping, Sweden.
    Karlsson, Charlie
    KTH, School of Industrial Engineering and Management (ITM), Centres, Centre of Excellence for Science and Innovation Studies, CESIS.
    Metropolitan regions and export renewal2013In: Advances in Spatial Science, Springer International Publishing , 2013, p. 235-260Conference paper (Refereed)
    Abstract [en]

    Metropolitan regions are advantageous location for new export products due to factors such as external economies, diversified industry environment and a large share of skilled labour. This is the main assumption of this paper. What happens to these products when the technology becomes common knowledge? Using empirical data on exports, we find that products with a high specialisation in the metropolitan region have a tendency to be successful in the non-metropolitan regions subsequent years. Also, this export product diffusion does not seem to be related to a location in the immediate proximity to the metropolitan region. Instead, the recipient regions are mainly characterised as being centrally located in its labour market region, having a high share of highly educated individuals. Features related product standardisation such as a large manufacturing sector and low labour costs cannot be distinguished as prominent features.

  • 103.
    Bjorling, E.
    et al.
    KTH.
    Oksvold, P.
    KTH.
    Forsberg, M.
    KTH.
    Lund, J.
    KTH.
    Ponten, F.
    Uppsala Univ, Uppsala, Sweden..
    Uhlén, Mathias
    KTH, Superseded Departments (pre-2005), Biotechnology.
    The creation and usage of a human protein atlas database2005In: Molecular & Cellular Proteomics, ISSN 1535-9476, E-ISSN 1535-9484, Vol. 4, no 8, p. S18-S18Article in journal (Other academic)
  • 104.
    Björk, T.
    KTH, School of Engineering Sciences (SCI), Mathematics (Dept.), Mathematics (Div.).
    Optimal Consumption and Investment in a Stochastic Model2020In: Probability Theory and Mathematical Statistics: Proceedings of the Fourth Vilnius Conference, De Gruyter , 2020, p. 199-201Chapter in book (Other academic)
  • 105.
    Björklund, Kicki
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Real Estate and Construction Management, Building and Real Estate Economics.
    Söderberg, Bo
    KTH, School of Architecture and the Built Environment (ABE), Real Estate and Construction Management, Building and Real Estate Economics.
    Wilhelmsson, Mats
    KTH, School of Architecture and the Built Environment (ABE), Real Estate and Construction Management, Building and Real Estate Economics.
    An investigation of Property Price Studies2002In: Real Estate Valuation Theory / [ed] Ko Wang, Marvin L. Wolverton, Boston, MA: Springer , 2002, Vol. 8, p. 63-93Chapter in book (Refereed)
    Abstract [en]

    Several delicate issues are connected to the question of how to compose scientific papers. A number of rules and guidelines apply — some interdisciplinary, others common for all sciences. The scientific policies of the academic journals, but also their space constraints, play an important role in forming the rules. Still, in several situations the question regarding what should be explained and interpreted explicitly and what may be left for the been discussed above, that can explain why it is reasonable not to find only “yes” answers to the questionnaire. In light of these objections, we find the overall result to be reasonably good. However, in two respects we found the results surprisingly poor, taking into account the emphasis that has been put on the topics in standard textbooks and earlier reviews.

  • 106.
    Björkqvist, Oskar
    et al.
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
    Kolitsidas, Christos
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
    Dahlberg, Oskar
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
    Silver, Gustaf
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
    Mattsson, M.
    Jonsson, B. Lars G.
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
    A Novel Efficient Multiple Input Single Output RF Energy Harvesting Rectification Scheme2017In: 2017 IEEE Antennas and Propagation Society International Symposium, Proceedings, Institute of Electrical and Electronics Engineers (IEEE), 2017, p. 1605-1606Conference paper (Refereed)
    Abstract [en]

    In this work an implementation of an ambient radio frequency harvesting system utilizing multiple input single output approach is demonstrated. Measurements of typical ambient radiation have been conducted with respect to power levels and frequency to determine which communication signals are suitable for harvesting. The measurement campaign showed that the WiFi frequency band at 2.45 GHz is a good candidate for indoors applications. A Greinacher voltage doubler is used for the rectification. A multiple input single output - MISO scalable scheme approach is implemented that is able to provide a DC differential output voltage. Simulated and experimental results proved the MISO rectenna to be an efficient scheme for RF harvesting.

  • 107.
    Blomqvist, Lars
    et al.
    RISE Research Institutes of Sweden, Sweden.
    Crocetti, Roberto
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Materials.
    Claesson, August
    KTH, School of Architecture and the Built Environment (ABE).
    Osmane, Zakaria Ben
    KTH.
    Ziethén, Rune
    RISE Research Institutes of Sweden, Sweden.
    Johansson, Marie
    RISE Research Institutes of Sweden, Sweden.
    Experimental and numerical analyses of a connection for CLT structures2023In: 13th World Conference on Timber Engineering, WCTE 2023, Curran Associates, Inc. , 2023, p. 1154-1159Conference paper (Refereed)
    Abstract [en]

    Although building systems made of cross-laminated timber (CLT) have become common in Sweden in the past 20 years and they have developed rapidly during the same period, steps remain to be taken to simplify the assembly of such systems, especially at construction sites. Current construction methods, however, remain labourintensive and thus show room for improvement. This paper describes a novel connection for the assembly of building elements made of CLT. Simple and inexpensive, the connection is fairly insensitive to manufacturing tolerances and enables rapid, more efficient construction than the connections for CLT structures currently used. Test results show the excellent strength and stiffness of the connection, which also allows the replacement of numerous fasteners, including nails and screws, with only a single steel rod.

  • 108.
    Bodin, Per
    et al.
    KTH, Superseded Departments (pre-2005), Signals, Sensors and Systems.
    Wahlberg, Bo
    KTH, Superseded Departments (pre-2005), Signals, Sensors and Systems.
    A frequency response estimation method based on smoothing and thresholding1998In: International Journal of Adaptive Control and Signal Processing, ISSN 0890-6327, Vol. 12, no 5, p. 407-416Article in journal (Refereed)
    Abstract [en]

    A standard approach for estimating the frequency function of a linear dynamical system is to use spectral estimation. Traditionally, this is done by smoothing the noisy frequency data using linear filters. The method has proved to be successful in most cases and is widely used. However, if the frequency response has fine details appearing only locally in frequency, the loss of resolution caused by smoothing might result in unacceptable errors. In this paper, a different method for frequency response estimation is suggested. The method utilizes recently proposed wavelet-based denoising schemes combined with traditional smoothing techniques. The wavelet transform is applied in the frequency domain in order to provide a suitable frequency window. Tested through simulations, this approach provides an alternative when traditional methods fail.

  • 109.
    Boeck, M.
    et al.
    KTH.
    Forsgren, Anders
    KTH, School of Engineering Sciences (SCI), Mathematics (Dept.), Optimization and Systems Theory.
    Eriksson, K.
    KTH.
    Karlsson, J.
    KTH.
    Robust Model Predictive Control for Adaptive Radiation Therapy2017In: Medical physics (Lancaster), ISSN 0094-2405, Vol. 44, no 6, p. 3143-3143Article in journal (Other academic)
  • 110.
    Boella, Guido
    et al.
    Dipartimento di Informatica, Università di Torino, I-10149, Torino, Corso Svizzera 185, Italy, Corso Svizzera 185.
    Van Der Torre, Leendert
    Department of Computer Science and Communications, University of Luxembourg, L-1359, Luxembourg, rue Richard Coudenhove 6 - Kalergi, Luxembourg, rue Richard Coudenhove 6 - Kalergi.
    Verhagen, Harko
    KTH, School of Information and Communication Technology (ICT), Computer and Systems Sciences, DSV. Department of Computer and Systems Sciences, Stockholm University .
    Introduction to Normative Multiagent Systems2007In: Normative Multi-Agent Systems 2007, Schloss Dagstuhl- Leibniz-Zentrum fur Informatik GmbH, Dagstuhl Publishing , 2007Conference paper (Refereed)
    Abstract [en]

    This article introduces the research issues related to and definition of normative multiagent systems.

  • 111.
    Bonnet-Staub, Isabelle
    KTH.
    Debris flow hazard assessment and mapping; application to a case study in the French Alps2018In: ISRM International Symposium 2000, IS 2000, International Society for Rock Mechanics , 2018Conference paper (Refereed)
    Abstract [en]

    The paper presents a methodology developed to determine the spatial "debris-flow initiation hazard". Through the field study of twelve catchments prone to debris flows in the French Alps and the laboratory analyses of many samples of debris-flow deposits and source-area materials, data on the environmental setting are provided. The potential debris-flow source-areas are localized, and their characteristics compared. Relying on this analysis, the author has selected five predisposition factors that are relevant to debris-flow initiation, which are related to slope angle, geology, mass movements, volumes and granulometric properties of superficial deposits. The data related to these factors were quantified and processed using an algorithm, and maps of the "debris-flow initiation" hazard were produced. The methodology provides a special emphasize on geotechnical data and quaternary geology. They illustrate the spatial distribution of potential events and allow identifying potential source areas and planning works in order to mitigate the risk.

  • 112.
    Boon, Edward
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Industrial Economics and Management (Dept.).
    Veligurska, Olga
    KTH.
    Differentiation Between Business School Responsibility Efforts Across Regions: A Content Analysis Of Prme Sharing Information On Progress Reports2015In: Ideas In Marketing: Finding The New And Polishing The Old, Springer, 2015, p. 680-683Conference paper (Refereed)
    Abstract [en]

    Over the last decade, a string of corporate scandals followed by the 2007-2008 banking crisis have placed corporations and financial institutions under increased scrutiny by media, government and the general public. Concerns about irresponsible business practices have extended to management education, in particular MBA programs, which are seen as the primary suppliers of corporate staff (Cornuel 2010). Universities have responded by increasing the emphasis on responsibility and sustainability in their education programs, research, and operations.

  • 113.
    Boon, Edward
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Industrial Economics and Management (Dept.), Industrial marketing.
    Wiid, Ria
    KTH, School of Industrial Engineering and Management (ITM), Industrial Economics and Management (Dept.), Industrial marketing.
    DesAutels, Philips
    KTH, School of Industrial Engineering and Management (ITM), Industrial Economics and Management (Dept.), Industrial marketing.
    Teeth whitening, boot camp, and a brewery tour: A practical analysis of 'deal of the day'2012In: Journal of Public Affairs, ISSN 1472-3891, E-ISSN 1479-1854, Vol. 12, no 2, p. 137-144Article in journal (Refereed)
    Abstract [en]

    The deal of the day has become a familiar feature on the online marketing landscape. Most prominent in the crowded space of the discount of the day is the company Groupon. It uses the lens of social media to amplify the reach of its online sales promotions. This paper examines the deal of the day phenomenon by comparing it with more familiar promotional and online marketing approaches such as group buying, e-couponing, and email marketing. It analyzes the content of 847 Groupon deals across 44 US cities in terms of characteristics, scope, and limitations and provides specific insight into the public policy issues that the phenomenon is giving rise to.

  • 114.
    Bouchet, P.
    et al.
    Université Paris-Saclay, Université Paris Cité, CEA, CNRS, AIM, F-91191 Gif-sur-Yvette, France;.
    Larsson, J.
    KTH.
    Vandenbussche, B.
    et al.,
    JWST MIRI Imager Observations of Supernova SN 1987A2024In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 965, no 1, article id 51Article in journal (Refereed)
    Abstract [en]

    There exist very few mid-infrared (IR) observations of supernovae (SNe) in general. Therefore, SN 1987A, the closest visible SN in 400 yr, gives us the opportunity to explore the mid-IR properties of SNe, the dust in their ejecta, and the surrounding medium and to witness the birth of an SN remnant (SNR). The James Webb Space Telescope, with its high spatial resolution and extreme sensitivity, gives a new view on these issues. We report on the first imaging observations obtained with the Mid-InfraRed Instrument (MIRI). We build temperature maps and discuss the morphology of the nascent SNR. Our results show that the temperatures in the equatorial ring (ER) are quite nonuniform. This could be due to dust destruction in some parts of the ring, as had been assumed in some previous works. We show that the IR emission extends beyond the ER, illustrating the fact that the shock wave has now passed through this ring to affect the circumstellar medium on a larger scale. Finally, while submillimeter Atacama Large Millimeter Array observations have hinted at the location of the compact remnant of SN 1987A, we note that our MIRI data have found no such evidence.

  • 115.
    Bowallius, Olof
    et al.
    KTH, School of Information and Communication Technology (ICT), Material Physics, Semiconductor Materials, HMA.
    Ankarcrona, Johan
    Uppsala universitet.
    Hammar, Mattias
    KTH, School of Information and Communication Technology (ICT), Material Physics, Semiconductor Materials, HMA.
    Anand, S.
    KTH, School of Information and Communication Technology (ICT), Material Physics, Semiconductor Materials, HMA.
    Nilsson, S.
    KTH, School of Information and Communication Technology (ICT), Material Physics, Semiconductor Materials, HMA.
    Landgren, Gunnar
    KTH, School of Information and Communication Technology (ICT), Material Physics, Semiconductor Materials, HMA.
    Radamson, Henry H.
    KTH, School of Information and Communication Technology (ICT), Material Physics, Semiconductor Materials, HMA. rad@kth.se.
    Tilly, L. P.
    Ericsson Components AB, S-16481 Kista, Sweden.
    Scanning Capacitance Microscopy for Two-Dimensional Doping Profiling in Si- and InP-Based Device Structures1999In: Physica Scripta T, ISSN 0281-1847, Vol. 79, p. 163-166Article in journal (Refereed)
    Abstract [en]

    We report on the application of cross-sectional Scanning Capacitance Microscopy (SCM) for studying two-dimensional doping variations in Si and InP device structures. Different sample preparation methods were evaluated and the response of the SCM signal from various test structures, including epitaxially grown layers with n- and p-doping concentrations ranging from 5 × 1014 to 2 × 1019 cm-3, were examined under different imaging conditions. The technique was further evaluated by imaging a Si bipolar transistor structure and an InP-based buried heterostructure diode laser. We conclude that valuable information can be gained also from complex device structures.

  • 116.
    Brandenburg, Axel
    et al.
    KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
    Bracco, Andrea
    Kahniashvili, Tina
    Carnegie Mellon Univ, McWilliams Ctr Cosmol, 5000 Forbes Ave, Pittsburgh, PA 15213 USA.;Carnegie Mellon Univ, Dept Phys, 5000 Forbes Ave, Pittsburgh, PA 15213 USA.;Ilia State Univ, Abastumani Astrophys Observ, 3-5 Cholokashvili St, GE-0194 Tbilisi, Rep of Georgia..
    Mandal, Sayan
    Carnegie Mellon Univ, McWilliams Ctr Cosmol, 5000 Forbes Ave, Pittsburgh, PA 15213 USA.;Carnegie Mellon Univ, Dept Phys, 5000 Forbes Ave, Pittsburgh, PA 15213 USA..
    Pol, Alberto Roper
    Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80303 USA.;Univ Colorado, Dept Aerosp Engn Sci, Boulder, CO 80303 USA..
    Petrie, Gordon J. D.
    Natl Solar Observ, 3665 Discovery Dr, Boulder, CO 80303 USA..
    Singh, Nishant K.
    Max Planck Inst Sonnensystemforsch, Justus von Liebig Weg 3, D-37077 Gottingen, Germany..
    E and B Polarizations from Inhomogeneous and Solar Surface Turbulence2019In: Astrophysical Journal, ISSN 0004-637X, Vol. 870, no 2, article id 87Article in journal (Refereed)
    Abstract [en]

    Gradient- and curl-type or E- and B-type polarizations have been routinely analyzed to study the physics contributing to the cosmic microwave background polarization and galactic foregrounds. They characterize the parity-even and parity-odd properties of the underlying physical mechanisms, such as, for example, hydromagnetic turbulence in the case of dust polarization. Here, we study spectral correlation functions characterizing the parity-even and parity-odd parts of linear polarization for homogeneous and inhomogeneous turbulence to show that only the inhomogeneous helical case can give rise to a parity-odd polarization signal. We also study nonhelical turbulence and suggest that a strong non-vanishing (here negative) skewness of the E polarization is responsible for an enhanced ratio of the EE to the BB (quadratic) correlation in both the helical and nonhelical cases. This could explain the enhanced EE/BB ratio observed recently for dust polarization. We close with a preliminary assessment of using the linear polarization of the Sun to characterize its helical turbulence without being subjected to the pi ambiguity that magnetic inversion techniques have to address.

  • 117.
    Brandenburg, Axel
    et al.
    KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Stockholm Univ, Hannes Alfvens Vag 12, SE-10691 Stockholm, Sweden.;Stockholm Univ, AlbaNova Univ Ctr, Dept Astron, SE-10691 Stockholm, Sweden.;Carnegie Mellon Univ, McWilliams Ctr Cosmol, 5000 Forbes Ave, Pittsburgh, PA 15213 USA.;Carnegie Mellon Univ, Dept Phys, 5000 Forbes Ave, Pittsburgh, PA 15213 USA.;Ilia State Univ, Fac Nat Sci & Med, 3-5 Cholokashvili Ave, GE-0194 Tbilisi, Georgia..
    He, Yutong
    Stockholm Univ, Hannes Alfvens Vag 12, SE-10691 Stockholm, Sweden.;Stockholm Univ, AlbaNova Univ Ctr, Dept Astron, SE-10691 Stockholm, Sweden..
    Kahniashvili, Tina
    Carnegie Mellon Univ, McWilliams Ctr Cosmol, 5000 Forbes Ave, Pittsburgh, PA 15213 USA.;Carnegie Mellon Univ, Dept Phys, 5000 Forbes Ave, Pittsburgh, PA 15213 USA.;Ilia State Univ, Fac Nat Sci & Med, 3-5 Cholokashvili Ave, GE-0194 Tbilisi, Georgia.;Abastumani Astrophys Observ, Dept Theoret Astrophys & Cosmol, 47-57 Kostava St, GE-0179 Tbilisi, Georgia..
    Rheinhardt, Matthias
    Aalto Univ, Dept Comp Sci, POB 15400, FI-00076 Aalto, Finland..
    Schober, Jennifer
    EPFL, Lab Astrophys, CH-1290 Sauverny, Switzerland..
    Relic Gravitational Waves from the Chiral Magnetic Effect2021In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 911, no 2, article id 110Article in journal (Refereed)
    Abstract [en]

    Relic gravitational waves (GWs) can be produced by primordial magnetic fields. However, not much is known about the resulting GW amplitudes and their dependence on the details of the generation mechanism. Here we treat magnetic field generation through the chiral magnetic effect (CME) as a generic mechanism and explore its dependence on the speed of generation (the product of magnetic diffusivity and characteristic wavenumber) and the speed characterizing the maximum magnetic field strength expected from the CME. When the latter exceeds the former (regime I), which is the regime applicable to the early universe, we obtain an inverse cascade with moderate GW energy that scales with the third power of the magnetic energy. When the generation speed exceeds the CME limit (regime II), the GW energy continues to increase without a corresponding increase of magnetic energy. In the early kinematic phase, the GW energy spectrum (per linear wavenumber interval) has opposite slopes in both regimes and is characterized by an inertial range spectrum in regime I and a white noise spectrum in regime II. The occurrence of these two slopes is shown to be a generic consequence of a nearly monochromatic exponential growth of the magnetic field. The resulting GW energy is found to be proportional to the fifth power of the limiting CME speed and the first power of the generation speed.

  • 118.
    Brandenburg, Axel
    et al.
    KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Nordita SU; Stockholm Univ, Nordita, Hannes Alfvens Vag 12, S-10691 Stockholm, Sweden.;Stockholm Univ, Oskar Klein Ctr, Dept Phys, AlbaNova, S-10691 Stockholm, Sweden.;Ilia State Univ, Sch Nat Sci & Med, Tbilisi 0194, Georgia.;Carnegie Mellon Univ, McWilliams Ctr Cosmol, Pittsburgh, PA 15213 USA.;Carnegie Mellon Univ, Dept Phys, Pittsburgh, PA 15213 USA..
    Larsson, Gustav
    Nordita SU; Stockholm Univ, Nordita, Hannes Alfvens Vag 12, S-10691 Stockholm, Sweden.;Stockholm Univ, Oskar Klein Ctr, Dept Phys, AlbaNova, S-10691 Stockholm, Sweden..
    Turbulence with Magnetic Helicity That Is Absent on Average2023In: Atmosphere, ISSN 2073-4433, E-ISSN 2073-4433, Vol. 14, no 6, article id 932Article in journal (Refereed)
    Abstract [en]

    Magnetic helicity plays a tremendously important role when it is different from zero on average. Most notably, it leads to the phenomenon of an inverse cascade. Here, we consider decaying magnetohydrodynamic (MHD) turbulence as well as some less common examples of magnetic evolution under the Hall effect and ambipolar diffusion, as well as cases in which the magnetic field evolution is constrained by the presence of an asymmetry in the number density of chiral fermions, whose spin is systematically either aligned or anti-aligned with its momentum. In all those cases, there is a new conserved quantity: the Hosking integral. We present quantitative scaling results for the magnetic integral scale as well as the magnetic energy density and its spectrum. We also compare with cases were a magnetic version of the Saffman integral is initially finite. Rotation in MHD turbulence tends to suppress nonlinearity and thereby also inverse cascading. Finally, the role of the Hosking and magnetic Saffman integrals in shell models of turbulence is examined.

  • 119.
    Bresin, Roberto
    et al.
    KTH, School of Electrical Engineering and Computer Science (EECS), Intelligent systems, Speech, Music and Hearing, TMH.
    Friberg, Anders
    KTH, Superseded Departments (pre-2005), Speech, Music and Hearing.
    Dahl, Sofia
    KTH, School of Electrical Engineering and Computer Science (EECS), Intelligent systems, Speech, Music and Hearing, TMH.
    Toward a new model for sound control2001In: Proceedings of the COST G-6 Conference on Digital Audio Effects (DAFX-01), Limerick, Ireland, December 6-8, 200 / [ed] Fernström, M., Brazil, E., & Marshall, M., 2001, p. 45-49Conference paper (Refereed)
    Abstract [en]

    The control of sound synthesis is a well-known problem. This is particularly true if the sounds are generated with physical modeling techniques that typically need specification of numerous control parameters. In the present work outcomes from studies on automatic music performance are used for tackling this problem. 

    Download full text (pdf)
    fulltext
  • 120.
    Brethouwer, Gert
    et al.
    KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.
    Lindborg, Anders V.
    KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.
    Investigation of fluid particle dispersion in stably stratified turbulence2009In: 6th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2009, International Symposium on Turbulence and Shear Flow Phenomena, TSFP , 2009, p. 1160-1163Conference paper (Refereed)
    Abstract [en]

    Numerical simulations are used to study vertical dispersion of fluid particles in homogeneous turbulent flows with a stable stratification (Brethouwer and Lindborg, 2009). The results of direct numerical simulations are in good agreement with the relation for the long time fluid particle dispersion, δz2 = 2εP t/N2, derived by Lindborg and Brethouwer (2008), though with a small dependence on the buoyancy Reynolds number. Here, δz2 is the mean square vertical particle displacement, εP is the dissipation of potential energy, t is time and N is the Brunt-Väisälä frequency. Simulations with hyperviscosicity are performed to verify the relation δz2 = (1 + πCP L)2εP t/N2 for N−1 t T, where N is the Brunt-Väisälä frequency and T is the turbulent eddy turnover time. The simulation results approach the relation for increasing stratification and we find that CP L is about 3 in strongly stratified fluids. The onset of a plateau in δz2 is observed in the simulations at t ∼ T . 

  • 121.
    Broman, Lars Mikael
    et al.
    Karolinska Univ Hosp, Dept Pediat Perioperat Med & Intens Care, ECMO Ctr Karolinska, S-17176 Stockholm, Sweden.;Karolinska Inst, Dept Physiol & Pharmacol, Stockholm, Sweden.;EuroELSO, Working Grp Innovat & Technol, Newcastle Upon Tyne, Tyne & Wear, England..
    Prahl Wittberg, Lisa
    KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, School of Engineering Sciences (SCI), Centres, BioMEx.
    Westlund, C. Jerker
    Karolinska Univ Hosp, Dept Pediat Perioperat Med & Intens Care, ECMO Ctr Karolinska, S-17176 Stockholm, Sweden..
    Gilbers, Martijn
    Maastricht Univ, Hosp Med, Cardiovasc Res Inst Maastricht CARIM, Heart & Vasc Ctr,Dept Cardiothorac Surg, Maastricht, Netherlands.;Maastricht Univ, Dept Physiol, Maastricht, Netherlands..
    da Camara, Luisa Perry
    Hosp Curry Cabral, Ctr Hosp Lisboa Cent, Lisbon, Portugal..
    Westin, Jan
    Karolinska Univ Hosp, Dept Med Technol, Stockholm, Sweden..
    Taccone, Fabio Silvio
    EuroELSO, Working Grp Innovat & Technol, Newcastle Upon Tyne, Tyne & Wear, England.;ULB, Dept Intens Care, Hop Erasme, Brussels, Belgium..
    Malfertheiner, Maximilian Valentin
    EuroELSO, Working Grp Innovat & Technol, Newcastle Upon Tyne, Tyne & Wear, England.;Univ Med Ctr Regensburg, Dept Internal Med Cardiol & Pneumol 2, Regensburg, Germany..
    Di Nardo, Matteo
    EuroELSO, Working Grp Innovat & Technol, Newcastle Upon Tyne, Tyne & Wear, England.;Childrens Hosp Bambino Gesu, IRCCS, Pediat Intens Care Unit, Rome, Italy..
    Swol, Justyna
    EuroELSO, Working Grp Innovat & Technol, Newcastle Upon Tyne, Tyne & Wear, England.;Paracelsus Med Univ, Dept Pulmonol, Intens Care Med, Nurnberg, Germany..
    Vercaemst, Leen
    EuroELSO, Working Grp Innovat & Technol, Newcastle Upon Tyne, Tyne & Wear, England.;Univ Hosp Gasthuisberg, Dept Perfus, Louven, Belgium..
    Barrett, Nicholas A.
    EuroELSO, Working Grp Innovat & Technol, Newcastle Upon Tyne, Tyne & Wear, England.;Guys & St Thomas NHS Fdn Trust, Dept Crit Care, London, England.;Guys & St Thomas NHS Fdn Trust, Severe Resp Failure Serv, London, England..
    Pappalardo, Federico
    EuroELSO, Working Grp Innovat & Technol, Newcastle Upon Tyne, Tyne & Wear, England.;Univ Vita Salute San Raffaele, Hosp San Raffaele, Adv Heart Failure & Mech Circulatory Support Prog, Milan, Italy..
    Belohlavek, Jan
    EuroELSO, Working Grp Innovat & Technol, Newcastle Upon Tyne, Tyne & Wear, England.;Charles Univ Prague, Dept Med 2, Dept Cardiovasc Med, Gen Univ Hosp Prague, Prague, Czech Republic.;Charles Univ Prague, Fac Med 1, Prague, Czech Republic..
    Mueller, Thomas
    EuroELSO, Working Grp Innovat & Technol, Newcastle Upon Tyne, Tyne & Wear, England.;Univ Med Ctr Regensburg, Dept Internal Med Cardiol & Pneumol 2, Regensburg, Germany..
    Belliato, Mirko
    EuroELSO, Working Grp Innovat & Technol, Newcastle Upon Tyne, Tyne & Wear, England.;Fdn IRCCS Policlin San Matteo, UOC Anestesia & Rianimaz 1, Pavia, Italy..
    Lorusso, Roberto
    KTH, School of Engineering Sciences (SCI), Centres, BioMEx. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. EuroELSO, Working Grp Innovat & Technol, Newcastle Upon Tyne, Tyne & Wear, England.
    Pressure and flow properties of cannulae for extracorporeal membrane oxygenation II: drainage (venous) cannulae2019In: Perfusion, ISSN 0267-6591, E-ISSN 1477-111X, Vol. 34, p. 65-73Article in journal (Refereed)
    Abstract [en]

    The use of extracorporeal life support devices such as extracorporeal membrane oxygenation in adults requires cannulation of the patient's vessels with comparatively large diameter cannulae to allow circulation of large volumes of blood (>5 L/min). The cannula diameter and length are the major determinants for extracorporeal membrane oxygenation flow. Manufacturing companies present pressure-flow charts for the cannulae; however, these tests are performed with water. Aims of this study were 1. to investigate the specified pressure-flow charts obtained when using human blood as the circulating medium and 2. to support extracorporeal membrane oxygenation providers with pressure-flow data for correct choice of the cannula to reach an optimal flow with optimal hydrodynamic performance. Eighteen extracorporeal membrane oxygenation drainage cannulae, donated by the manufacturers (n = 6), were studied in a centrifugal pump driven mock loop. Pressure-flow properties and cannula features were described. The results showed that when blood with a hematocrit of 27% was used, the drainage pressure was consistently higher for a given flow (range 10%-350%) than when water was used (data from each respective manufacturer's product information). It is concluded that the information provided by manufacturers in line with regulatory guidelines does not correspond to clinical performance and therefore may not provide the best guidance for clinicians.

  • 122.
    Broström, Anders
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Industrial Economics and Management (Dept.), Economics.
    Karlsson, Staffan
    KTH. Swedish Research Council.
    Mapping research on R&D, innovation and productivity: a study of an academic endavour2017In: Economics of Innovation and New Technology, ISSN 1043-8599, E-ISSN 1476-8364, Vol. 26, no 1-2, p. 6-20Article in journal (Refereed)
  • 123.
    Brynielsson, Joel
    et al.
    KTH, School of Electrical Engineering and Computer Science (EECS), Computer Science, Theoretical Computer Science, TCS. FOI Swedish Def Res Agcy, SE-16490 Stockholm, Sweden..
    Cohen, Mika
    KTH, School of Electrical Engineering and Computer Science (EECS), Computer Science, Theoretical Computer Science, TCS. FOI Swedish Def Res Agcy, SE-16490 Stockholm, Sweden..
    Hansen, Patrik
    FOI Swedish Def Res Agcy, SE-16490 Stockholm, Sweden..
    Lavebrink, Samuel
    KTH.
    Lindström, Madeleine
    KTH.
    Tjörnhammar, Edward
    KTH, School of Electrical Engineering and Computer Science (EECS), Computer Science, Software and Computer systems, SCS. FOI Swedish Def Res Agcy, SE-16490 Stockholm, Sweden..
    Comparison of Strategies for Honeypot Deployment2023In: Proceedings Of The 2023 Ieee/Acm International Conference On Advances In Social Networks Analysis And Mining, Asonam 2023 / [ed] Prakash, BA Wang, D Weninger, T, Association for Computing Machinery (ACM) , 2023, p. 612-619Conference paper (Refereed)
    Abstract [en]

    Recent experimental studies have explored how well adaptive honeypot allocation strategies defend against human adversaries. As the experimental subjects were drawn from an unknown, nondescript pool of subjects using Amazon Mechanical Turk, the relevance to defense against real-world adversaries is unclear. The present study reproduces the experiments with more relevant experimental subjects. The results suggest that the strategies considered are less effective against attackers from the current population. In particular, their ability to predict the next attack decreased steadily over time, that is, the human subjects from this population learned to attack less and less predictably.

  • 124.
    Buckler, Andrew J.
    et al.
    Karolinska Inst, Dept Mol Med & Surg, Stockholm, Sweden.;Elucid Bioimaging Inc, Boston, MA USA..
    van Wanrooij, Max
    KTH, School of Engineering Sciences (SCI), Engineering Mechanics.
    Andersson, Måns
    KTH, School of Engineering Sciences (SCI), Engineering Mechanics.
    Karlof, Eva
    Karolinska Inst, Dept Mol Med & Surg, Stockholm, Sweden..
    Matic, Ljubica Perisic
    Karolinska Inst, Dept Mol Med & Surg, Stockholm, Sweden..
    Hedin, Ulf
    Karolinska Inst, Dept Mol Med & Surg, Stockholm, Sweden..
    Gasser, T. Christian
    KTH, School of Engineering Sciences (SCI), Engineering Mechanics, Vehicle Engineering and Solid Mechanics, Solid Mechanics. Univ Southern Denmark, Fac Hlth Sci, Odense, Denmark..
    Patient-specific biomechanical analysis of atherosclerotic plaques enabled by histologically validated tissue characterization from computed tomography angiography: A case study2022In: Journal of The Mechanical Behavior of Biomedical Materials, ISSN 1751-6161, E-ISSN 1878-0180, Vol. 134, article id 105403Article in journal (Refereed)
    Abstract [en]

    Background: Rupture of unstable atherosclerotic plaques with a large lipid-rich necrotic core and a thin fibrous cap cause myocardial infarction and stroke. Yet it has not been possible to assess this for individual patients. Clinical guidelines still rely on use of luminal narrowing, a poor indicator but one that persists for lack of effective means to do better. We present a case study demonstrating the assessment of biomechanical indices pertaining to plaque rupture risk non-invasively for individual patients enabled by histologically validated tissue characterization. Methods: Routinely acquired clinical images of plaques were analyzed to characterize vascular wall tissues using software validated by histology (ElucidVivo, Elucid Bioimaging Inc.). Based on the tissue distribution, wall stress and strain were then calculated at spatial locations with varied fibrous cap thicknesses at diastolic, mean and systolic blood pressures. Results: The von Mises stress of 152 [131, 172] kPa and the equivalent strain of 0.10 [0.08, 0.12] were calculated where the fibrous cap thickness was smallest (560 mu m) (95% CI in brackets). The stress at this location was at a level predictive of plaque failure. Stress and strain at locations with larger cap thicknesses were calculated to be lower, demonstrating a clinically relevant range of risk levels. Conclusion: Patient specific tissue characterization can identify distributions of stress and strain in a clinically relevant range. This capability may be used to identify high-risk lesions and personalize treatment decisions for individual patients with cardiovascular disease and improve prevention of myocardial infarction and stroke.

  • 125.
    Buckley, J.
    et al.
    Faculty of Engineering and Informatics, Technological University of the Shannon: Midlands Midwest, Athlone, Ireland.
    Trevelyan, James
    KTH, School of Industrial Engineering and Management (ITM), Learning.
    Winberg, C.
    School of Engineering, The University of Western Australia, Perth, Australia; Professional Education Research Institute, Cape Peninsula University of Technology, Cape Town, South Africa.
    Perspectives on engineering education from the world of practice2022In: European Journal of Engineering Education, ISSN 0304-3797, E-ISSN 1469-5898, Vol. 47, no 1, p. 1-7Article in journal (Refereed)
  • 126.
    Budreviciute, Aida
    et al.
    Kaunas Technol Univ KTU, Panevezys Fac Technol & Business, Panevezys, Lithuania..
    Damiati, Samar
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Protein Science. King Abdulaziz Univ KAU, Fac Sci, Dept Biochem, Jeddah, Saudi Arabia..
    Sabir, Dana Khdr
    Charmo Univ, Dept Med Lab Sci, Chamchamal, Iraq..
    Onder, Kamil
    Procomcure Biotech GmbH, Thalgau, Austria..
    Schuller-Goetzburg, Peter
    Paracelsus Med Univ Salzburg, Prosthet Biomech & Biomat Res, Salzburg, Austria..
    Plakys, Gediminas
    Kaunas Technol Univ KTU, Panevezys Fac Technol & Business, Panevezys, Lithuania..
    Katileviciute, Agne
    Kaunas Technol Univ KTU, Panevezys Fac Technol & Business, Panevezys, Lithuania..
    Khoja, Samir
    King Abdulaziz Univ KAU, Fac Sci, Dept Biochem, Jeddah, Saudi Arabia..
    Kodzius, Rimantas
    Kaunas Technol Univ KTU, Panevezys Fac Technol & Business, Panevezys, Lithuania.;Baltic Inst Adv Technol, Bioprospecting Dept, Vilnius, Lithuania.;Ludwig Maximilian Univ Munich LMU, Fac Med, Munich, Germany..
    Management and Prevention Strategies for Non-communicable Diseases (NCDs) and Their Risk Factors2020In: Frontiers In Public Health, ISSN 2296-2565, Vol. 8, article id 574111Article, review/survey (Refereed)
    Abstract [en]

    Non-communicable diseases (NCDs) are of increasing concern for society and national governments, as well as globally due to their high mortality rate. The main risk factors of NCDs can be classified into the categories of self-management, genetic factors, environmental factors, factors of medical conditions, and socio-demographic factors. The main focus is on the elements of self-management and to reach a consensus about the influence of food on risk management and actions toward the prevention of NCDs at all stages of life. Nutrition interventions are essential in managing the risk of NCDs. As they are of the utmost importance, this review highlights NCDs and their risk factors and outlines several common prevention strategies. We foresee that the best prevention management strategy will include individual (lifestyle management), societal (awareness management), national (health policy decisions), and global (health strategy) elements, with target actions, such as multi-sectoral partnership, knowledge and information management, and innovations. The most effective preventative strategy is the one that leads to changes in lifestyle with respect to diet, physical activities, cessation of smoking, and the control of metabolic disorders.

  • 127.
    Buffoni, Lorenzo
    et al.
    Department of Physics and Astronomy, University of Florence, 50019 Sesto Fiorentino, Italy.
    Coghi, Francesco
    Nordita SU.
    Gherardini, Stefano
    Istituto Nazionale di Ottica-CNR, Area Science Park, Basovizza, I-34149 Trieste, Italy, Area Science Park, Basovizza; SISSA, via Bonomea 265, 34136 Trieste, Italy, via Bonomea 265; LENS, University of Florence, via Carrara 1, I-50019 Sesto Fiorentino, Italy, via Carrara 1.
    Generalized Landauer bound from absolute irreversibility2024In: Physical review. E, ISSN 2470-0045, E-ISSN 2470-0053, Vol. 109, no 2, article id 024138Article in journal (Refereed)
    Abstract [en]

    In this work, we introduce a generalization of the Landauer bound for erasure processes that stems from absolutely irreversible dynamics. Assuming that the erasure process is carried out in an absolutely irreversible way so that the probability of observing some trajectories is zero in the forward process but finite in the reverse process, we derive a generalized form of the bound for the average erasure work, which is valid also for imperfect erasure and asymmetric bits. The generalized bound obtained is tighter than or, at worst, as tight as existing ones. Our theoretical predictions are supported by numerical experiments and the comparison with data from previous works.

  • 128.
    Bungon, Theodore
    et al.
    Univ Plymouth, Wolfson Nanomat & Devices Lab, Sch Engn Comp & Math, Fac Sci & Engn, Plymouth, Devon, England..
    Haslam, Carrie
    Univ Plymouth, Wolfson Nanomat & Devices Lab, Sch Engn Comp & Math, Fac Sci & Engn, Plymouth, Devon, England..
    Damiati, Samar
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Protein Science. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    O'Driscoll, Benjamin
    Univ Plymouth, Wolfson Nanomat & Devices Lab, Sch Engn Comp & Math, Fac Sci & Engn, Plymouth, Devon, England..
    Whitley, Toby
    Univ Plymouth, Wolfson Nanomat & Devices Lab, Sch Engn Comp & Math, Fac Sci & Engn, Plymouth, Devon, England..
    Davey, Paul
    Univ Plymouth, Wolfson Nanomat & Devices Lab, Sch Engn Comp & Math, Fac Sci & Engn, Plymouth, Devon, England..
    Siligardi, Giuliano
    Rutherford Appleton Lab, Diamond Light Source, Chilton, Oxon, England..
    Charmet, Jerome
    Univ Warwick, Inst Digital Healthcare, WMG, Coventry, W Midlands, England..
    Awan, Shakil A.
    Univ Plymouth, Wolfson Nanomat & Devices Lab, Sch Engn Comp & Math, Fac Sci & Engn, Plymouth, Devon, England..
    Graphene FET Sensors for Alzheimer's Disease Protein Biomarker Clusterin Detection2021In: Frontiers in Molecular Biosciences, E-ISSN 2296-889X, Vol. 8, article id 651232Article in journal (Refereed)
    Abstract [en]

    We report on the fabrication and characterisation of graphene field-effect transistor (GFET) biosensors for the detection of Clusterin, a prominent protein biomarker of Alzheimer's disease (AD). The GFET sensors were fabricated on Si/SiO2 substrate using photolithographic patterning and metal lift-off techniques with evaporated chromium and sputtered gold contacts. Raman Spectroscopy was performed on the devices to determine the quality of the graphene. The GFETs were annealed to improve their performance before the channels were functionalized by immobilising the graphene surface with linker molecules and anti-Clusterin antibodies. Concentration of linker molecules was also independently verified by absorption spectroscopy using the highly collimated micro-beam light of Diamond B23 beamline. The detection was achieved through the binding reaction between the antibody and varying concentrations of Clusterin antigen from 1 to 100 pg/mL, as well as specificity tests using human chorionic gonadotropin (hCG), a glycoprotein risk biomarker of certain cancers. The GFETs were characterized using direct current (DC) 4-probe electrical resistance (4-PER) measurements, which demonstrated a limit of detection of the biosensors to be similar to 300 fg/mL (4 fM). Comparison with back-gated Dirac voltage shifts with varying concentration of Clusterin show 4-PER measurements to be more accurate, at present, and point to a requirement for further optimisation of the fabrication processes for our next generation of GFET sensors. Thus, we have successfully fabricated a promising set of GFET biosensors for the detection of Clusterin protein biomarker. The developed GFET biosensors are entirely generic and also have the potential to be applied to a variety of other disease detection applications such as Parkinson's, cancer, and cardiovascular.

  • 129.
    Burman, L E
    KTH, Superseded Departments (pre-2005), Fibre and Polymer Technology.
    Total luminescence intensity and chromatographic fingerprinting - Tools for early degradation detection and classification of degradable polyethylene films.2005In: Abstracts of Papers of the American Chemical Society, ISSN 0065-7727, Vol. 229, p. U971-U971Article in journal (Other academic)
  • 130.
    Butina, Karen
    et al.
    AIMES – Center for the Advancement of Integrated Medical and Engineering Sciences at Karolinska Institutet and KTH Royal Institute of Technology, Stockholm, SE-171 77, Sweden; Department of Neuroscience, Karolinska Institutet, Stockholm, SE-171 77, Sweden.
    Filipović, Filip
    AIMES – Center for the Advancement of Integrated Medical and Engineering Sciences at Karolinska Institutet and KTH Royal Institute of Technology, Stockholm, SE-171 77, Sweden; Department of Neuroscience, Karolinska Institutet, Stockholm, SE-171 77, Sweden.
    Richter-Dahlfors, Agneta
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology. AIMES – Center for the Advancement of Integrated Medical and Engineering Sciences at Karolinska Institutet and KTH Royal Institute of Technology, Stockholm, SE-171 77, Sweden; Department of Neuroscience, Karolinska Institutet, Stockholm, SE-171 77, Sweden.
    Parlak, Onur
    AIMES – Center for the Advancement of Integrated Medical and Engineering Sciences at Karolinska Institutet and KTH Royal Institute of Technology, Stockholm, SE-171 77, Sweden; Dermatology and Venereology Unit, Department of Medicine, Solna, Karolinska Institutet, Stockholm, SE-171 76, Sweden.
    An Organic Electrochemical Transistor to Monitor Salmonella Growth in Real-Time2021In: Advanced Materials Interfaces, ISSN 2196-7350, Vol. 8, no 18, p. 2100961-, article id 2100961Article in journal (Refereed)
    Abstract [en]

    Organic electrochemical transistors (OECTs) are used in research and diagnostic applications due to their facile manufacture, scalability, and biocompatibility. In these devices, the source–drain current upon gate voltage application depends on ion concentration in the electrolyte. This study investigates whether an OECT can be employed to monitor bacterial growth since it is known that the concentration of charged species increases in bacterial cultures during growth. A poly(3,4-ethylenedioxythiophene):polystyrene sulfonate-based single-well OECT, compatible with long-term incubation of bacterial cultures, is fabricated. It is shown that the growth of Salmonella alters the transfer characteristics of the device and demonstrates how it can be applied to monitor growth in real-time by recording the source–drain current at gate voltage +0.5 V. The signal can also be measured in filtrates of bacterial cultures, devoid of bacterial cells. This suggests that the signal originates from charged metabolic products. Bacterial biofilm formation does not alter the device response. This proof-of-principle study presents OECT recordings as an alternative to optical methods, allowing bacterial growth to be monitored in transparent and opaque media alike. By measuring metabolic products rather than bacterial cell multiplication, insight into the stationary phase and other nondividing states may be obtained in the future.

  • 131.
    Butina, Karen
    et al.
    KTH, Centres, Center for the Advancement of Integrated Medical and Engineering Sciences, AIMES. Department of Neuroscience, Karolinska Institutet, Solnavägen 9, Stockholm, 171 77, Sweden.
    Lantz, L.
    Department of Chemistry, IFM, Linköping University, Linköping, 581 83, Sweden.
    Choong, Ferdinand X.
    KTH, Centres, Center for the Advancement of Integrated Medical and Engineering Sciences, AIMES. Department of Neuroscience, Karolinska Institutet, Solnavägen 9, Stockholm, 171 77, Sweden.
    Tomac, Ana
    KTH, Centres, Center for the Advancement of Integrated Medical and Engineering Sciences, AIMES. Department of Neuroscience, Karolinska Institutet, Solnavägen 9, Stockholm, 171 77, Sweden.
    Shirani, H.
    Department of Chemistry, IFM, Linköping University, Linköping, 581 83, Sweden.
    Löffler, Susanne
    Department of Neuroscience, Karolinska Institutet, Solnavägen 9, Stockholm, 171 77, Sweden.
    Nilsson, Karin Peter R.
    AIMES – Center for the Advancement of Integrated Medical, and Engineering Sciences, Karolinska Institutet and KTH Royal Institute of Technology, Solnavägen 9, Stockholm, 171 77, Sweden;Department of Chemistry, IFM, Linköping University, Linköping, 581 83, Sweden.
    Richter-Dahlfors, Agneta
    KTH, Centres, Center for the Advancement of Integrated Medical and Engineering Sciences, AIMES. Department of Neuroscience, Karolinska Institutet, Solnavägen 9, Stockholm, 171 77, Sweden.
    Structural Properties Dictating Selective Optotracer Detection of Staphylococcus aureus2022In: ChemBioChem (Print), ISSN 1439-4227, E-ISSN 1439-7633, Vol. 23, no 11, article id e202100684Article in journal (Refereed)
    Abstract [en]

    Optotracers are conformation-sensitive fluorescent tracer molecules that detect peptide- and carbohydrate-based biopolymers. Their binding to bacterial cell walls allows selective detection and visualisation of Staphylococcus aureus (S. aureus). Here, we investigated the structural properties providing optimal detection of S. aureus. We quantified spectral shifts and fluorescence intensity in mixes of bacteria and optotracers, using automatic peak analysis, cross-correlation, and area-under-curve analysis. We found that the length of the conjugated backbone and the number of charged groups, but not their distribution, are important factors for selective detection of S. aureus. The photophysical properties of optotracers were greatly improved by incorporating a donor-acceptor-donor (D-A-D)-type motif in the conjugated backbone. With significantly reduced background and binding-induced on-switch of fluorescence, these optotracers enabled real-time recordings of S. aureus growth. Collectively, this demonstrates that chemical structure and photophysics are key tunable characteristics in the development of optotracers for selective detection of bacterial species. 

  • 132.
    Bäckström, Anna
    et al.
    KTH, Centres, Science for Life Laboratory, SciLifeLab. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Protein Science.
    Kugel, Laura
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Protein Science.
    Gnann, Christian
    KTH, Centres, Science for Life Laboratory, SciLifeLab. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Protein Science, Cellular and Clinical Proteomics.
    Xu, Hao
    KTH, Centres, Science for Life Laboratory, SciLifeLab. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Protein Science, Cellular and Clinical Proteomics.
    Aslan, Joseph E.
    Oregon Hlth & Sci Univ, Knight Cardiovasc Inst, Portland, OR 97201 USA..
    Lundberg, Emma
    KTH, Centres, Science for Life Laboratory, SciLifeLab. KTH, School of Biotechnology (BIO), Centres, Albanova VinnExcellence Center for Protein Technology, ProNova. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Protein Science.
    Stadler, Charlotte
    KTH, Centres, Science for Life Laboratory, SciLifeLab. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Protein Science.
    A Sample Preparation Protocol for High Throughput Immunofluorescence of Suspension Cells on an Adherent Surface2020In: Journal of Histochemistry and Cytochemistry, ISSN 0022-1554, E-ISSN 1551-5044, Vol. 68, no 7, p. 473-489, article id 0022155420935403Article in journal (Refereed)
    Abstract [en]

    Imaging is a powerful approach for studying protein expression and has the advantage over other methodologies in providing spatial informationin situat single cell level. Using immunofluorescence and confocal microscopy, detailed information of subcellular distribution of proteins can be obtained. While adherent cells of different tissue origin are relatively easy to prepare for imaging applications, non-adherent cells from hematopoietic origin, present a challenge due to their poor attachment to surfaces and subsequent loss of a substantial fraction of the cells. Still, these cell types represent an important part of the human proteome and express genes that are not expressed in adherent cell types. In the era of cell mapping efforts, overcoming the challenge with suspension cells for imaging applications would enable systematic profiling of hematopoietic cells. In this work, we successfully established an immunofluorescence protocol for preparation of suspension cell lines, peripheral blood mononucleated cells (PBMC) and human platelets on an adherent surface. The protocol is based on a multi-well plate format with automated sample preparation, allowing for robust high throughput imaging applications. In combination with confocal microscopy, the protocol enables systematic exploration of protein localization to all major subcellular structures.

  • 133.
    Börjesson, Maria
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Transport Science, Transport Planning, Economics and Engineering. KTH, School of Architecture and the Built Environment (ABE), Centres, Centre for Transport Studies, CTS.
    Harry, Flam
    Mörth, Ulrika
    Nilsson, Jan-Eric
    KTH, School of Architecture and the Built Environment (ABE), Centres, Centre for Traffic Research, CTR. VTI.
    Infrastrukturbeslut måste grundas på samhällsekonomiska kalkyler: DN Debatt2016In: Dagens nyheter, ISSN 1101-2447, no 2016-02-17Article, book review (Other (popular science, discussion, etc.))
  • 134.
    Cabrera Arteaga, Javier
    et al.
    KTH, School of Electrical Engineering and Computer Science (EECS), Computer Science, Software and Computer systems, SCS.
    Monperrus, Martin
    KTH, School of Electrical Engineering and Computer Science (EECS), Computer Science, Theoretical Computer Science, TCS.
    Toady, Tim
    KTH, School of Electrical Engineering and Computer Science (EECS).
    Baudry, Benoit
    KTH, School of Electrical Engineering and Computer Science (EECS), Computer Science, Software and Computer systems, SCS.
    WebAssembly diversification for malware evasion2023In: Computers & security (Print), ISSN 0167-4048, E-ISSN 1872-6208, Vol. 131, article id 103296Article in journal (Refereed)
    Abstract [en]

    WebAssembly has become a crucial part of the modern web, offering a faster alternative to JavaScript in browsers. While boosting rich applications in browser, this technology is also very efficient to develop cryptojacking malware. This has triggered the development of several methods to detect cryptojacking malware. However, these defenses have not considered the possibility of attackers using evasion techniques. This paper explores how automatic binary diversification can support the evasion of WebAssembly cryptojacking detectors. We experiment with a dataset of 33 WebAssembly cryptojacking binaries and evaluate our evasion technique against two malware detectors: VirusTotal, a general-purpose detector, and MINOS, a WebAssembly-specific detector. Our results demonstrate that our technique can automatically generate variants of WebAssembly cryptojacking that evade the detectors in 90% of cases for VirusTotal and 100% for MINOS. Our results emphasize the importance of meta-antiviruses and diverse detection techniques and provide new insights into which WebAssembly code transformations are best suited for malware evasion. We also show that the variants introduce limited performance overhead, making binary diversification an effective technique for evasion.

  • 135.
    Cai, Fuhong
    et al.
    Hainan Univ, Coll Mech & Elect Engn, Haikou 570228, Hainan, Peoples R China..
    Chen, Jie
    Hainan Univ, Coll Mech & Elect Engn, Haikou 570228, Hainan, Peoples R China..
    Zhou, Chunling
    KTH, School of Engineering Sciences (SCI), Centres, Zhejiang-KTH Joint Research Center of Photonics, JORCEP. Lund Univ, Lund, Sweden..
    Zhu, Xuan
    Hainan Univ, Coll Mech & Elect Engn, Haikou 570228, Hainan, Peoples R China..
    He, Sailing
    KTH, School of Engineering Sciences (SCI), Centres, Zhejiang-KTH Joint Research Center of Photonics, JORCEP. Lund Univ, Lund, Sweden..
    Exploratory Study on Light-Sheet Based Three-Dimensional Surface Topography2018In: Progress In Electromagnetics Research, ISSN 1070-4698, E-ISSN 1559-8985, Vol. 161, p. 11-18Article in journal (Refereed)
    Abstract [en]

    Light-sheet microscopy has attracted considerable attention because it is a fluorescence imaging technique with rapid optical sectioning capability for transparent samples. In this study, we report a new application based on light-sheet microscopy for exploratory investigation of three-dimensional surface topography of opaque objects. Instead of using inelastic scattering fluorescent signals, our method utilizes the elastic scattering of light from the surface of opaque samples, which are illuminated by a light sheet generated by a cylindrical lens. Through a simple structural modification by removing the fluorescent filter, the orthogonal imaging module can capture the elastically-scattered image. As the opaque object is scanned by a motorized stage, the light-sheet microscope acquires a series of sectional images, which can be stitched into a three-dimensional surface topography image. This method also offers the opportunity to visualize a 3D fingerprint at micron-level resolution. Therefore, this technique may be used in industry and the biomedical field for the measurement of surface microstructure. To our best knowledge, this is the first time a light-sheet microscopy is utilized to perform surface topography measurement.

  • 136.
    Cai, Fuhong
    et al.
    KTH, School of Engineering Sciences (SCI), Centres, Zhejiang-KTH Joint Research Center of Photonics, JORCEP. Zhejiang Univ. (China) .
    Qian, Jun
    KTH, School of Engineering Sciences (SCI), Centres, Zhejiang-KTH Joint Research Center of Photonics, JORCEP. Zhejiang Univ. (China) .
    Jiang, Li
    KTH, School of Engineering Sciences (SCI), Centres, Zhejiang-KTH Joint Research Center of Photonics, JORCEP. Zhejiang Univ. (China) .
    He, Sailing
    KTH, School of Engineering Sciences (SCI), Centres, Zhejiang-KTH Joint Research Center of Photonics, JORCEP. Zhejiang Univ. (China) .
    Multifunctional optical imaging using dye-coated gold nanorods in a turbid medium2011In: Journal of Biomedical Optics, ISSN 1083-3668, E-ISSN 1560-2281, Vol. 16, no 1, p. 016002-Article in journal (Refereed)
    Abstract [en]

    We report multifunctional optical imaging using dye-coated gold nanorods. Three types of useful information, namely, Raman, fluorescence signals, and absorption contrast, can be obtained from a phantom experiment. These three kinds of information are detected in a nanoparticle-doped-phantom using diffuse optical imaging. Our novel nanoparticle could be used as a multimodality marker for future bioimaging applications.

  • 137.
    Calil Kores, Cristine
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Ismail, Nur
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Geskus, Dimitri
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Dijkstra, M.
    Bernhardi, Edward H.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Pollnau, Markus
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Temperature dependence of the resonance line of optically pumped distributed-feedback lasers2018In: Optics InfoBase Conference Papers, OSA - The Optical Society , 2018Conference paper (Refereed)
    Abstract [en]

    We characterize experimentally and theoretically a distributed-feedback laser resonator subject to a thermal chirp. The total accumulated phase shift determines the resonance wavelength. The reflectivities (outcoupling losses) at the resonance wavelength govern the resonance linewidth.

  • 138.
    Calil Kores, Cristine
    et al.
    KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics. Department of Applied Physics, School of Engineering Sciences, Roslagstullsbacken 21, 10691 Stockholm, Sweden .
    Ismail, Nur
    KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics.
    Geskus, Dimitri
    KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics.
    Dijkstra, Meindert
    Bernhardi, Edward
    KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics. Visiting scientist .
    Pollnau, Markus
    KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics. Advanced Technology Institute, Department of Electrical and Electronic Engineering, University of Surrey, Guildford GU2 7XH, UK.
    Temperature dependence of the spectral characteristics of distributed-feedback resonators2018In: Optics Express, E-ISSN 1094-4087, Vol. 26, no 4, p. 4892-4905Article in journal (Refereed)
    Abstract [en]

    We characterize the spectral response of a distributed-feedback resonator when subject to a thermal chirp. An Al2O3 rib waveguide with a corrugated surface Bragg grating inscribed into its SiO2 top cladding is experimentally investigated. We induce a near-to-linear temperature gradient along the resonator, leading to a similar variation of the grating period, and characterize its spectral response in terms of wavelength and linewidth of the resonance peak. Simulations are carried out, showing good agreement with the experimental results and indicating that the wavelength of the resonance peak is a result only of the total accumulated phase shift. For any chirp profile we are able to calculate the reflectivities at the resonance wavelength, and this information largely explains how the linewidth of the resonance changes. This result shows that the increase in linewidth is governed by the increase of the resonator outcoupling losses. 

    Download full text (pdf)
    fulltext
  • 139.
    Cao, J.
    et al.
    Univ Calif Davis, Dept Elect & Comp Engn, Davis, CA 95616 USA..
    Broeke, R. G.
    Univ Calif Davis, Dept Elect & Comp Engn, Davis, CA 95616 USA..
    Fontaine, N.
    Univ Calif Davis, Dept Elect & Comp Engn, Davis, CA 95616 USA..
    Cong, W.
    Univ Calif Davis, Dept Elect & Comp Engn, Davis, CA 95616 USA..
    Ji, C.
    Univ Calif Davis, Dept Elect & Comp Engn, Davis, CA 95616 USA..
    Du, Y.
    Univ Calif Davis, Dept Elect & Comp Engn, Davis, CA 95616 USA..
    Chubun, N.
    Univ Calif Davis, Dept Elect & Comp Engn, Davis, CA 95616 USA..
    Aihara, K.
    Univ Calif Davis, Dept Elect & Comp Engn, Davis, CA 95616 USA..
    Pharn, Anh-Vu
    Univ Calif Davis, Dept Elect & Comp Engn, Davis, CA 95616 USA..
    Heritage, J. P.
    Univ Calif Davis, Dept Elect & Comp Engn, Davis, CA 95616 USA..
    Kolner, B. H.
    Univ Calif Davis, Dept Elect & Comp Engn, Davis, CA 95616 USA..
    Yoo, S. J. B.
    Univ Calif Davis, Dept Elect & Comp Engn, Davis, CA 95616 USA..
    Olsson, F.
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Lourdudoss, Sebastian
    KTH, Superseded Departments (pre-2005), Microelectronics and Information Technology, IMIT.
    Stephan, P. L.
    Lawrence Livermore Natl Lab, Livermore, CA 94550 USA..
    Error-free spectral encoding and decoding operation of InPO-CDMA encoder2006In: 2006 OPTICAL FIBER COMMUNICATION CONFERENCE/NATIONAL FIBER OPTIC ENGINEERS CONFERENCE, VOLS 1-6, OPTICAL SOC AMERICA , 2006, p. 843-+Conference paper (Refereed)
    Abstract [en]

    We report error-free spectral encoding and decoding operation of an InP monolithic, ultra-compact optical-CDMA encoder/decoder photonic chip pair. The experimental results demonstrate the strong potential for realizing high performance O-CDMA networks with InP micro-systems. (C) 2006 Optical Society of America.

  • 140.
    Cao, Yuan
    et al.
    KTH, School of Electrical Engineering and Computer Science (EECS).
    Zhao, Yongli
    Li, Jun
    KTH, School of Electrical Engineering and Computer Science (EECS).
    Lin, Rui
    KTH, School of Electrical Engineering and Computer Science (EECS).
    Zhang, Jie
    Chen, Jiajia
    KTH, School of Electrical Engineering and Computer Science (EECS).
    Reinforcement Learning Based Multi-Tenant Secret-Key Assignment for Quantum Key Distribution Networks2019In: 2019 Optical Fiber Communications Conference And Exhibition (Ofc), IEEE, 2019Conference paper (Refereed)
    Abstract [en]

    We propose a reinforcement learning based online multi-tenant secret-key assignment algorithm for quantum key distribution networks, capable of reducing tenant-request blocking probability more than half compared to the benchmark heuristics.

  • 141.
    Cao, Yuan
    et al.
    KTH, School of Electrical Engineering and Computer Science (EECS).
    Zhao, Yongli
    Beijing Univ Posts & Telecommun, State Key Lab Informat Photon & Opt Commun, Beijing 100876, Peoples R China..
    Lin, Rui
    KTH, School of Electrical Engineering and Computer Science (EECS), Computer Science, Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Yu, Xiaosong
    Beijing Univ Posts & Telecommun, State Key Lab Informat Photon & Opt Commun, Beijing 100876, Peoples R China..
    Zhang, Jie
    Beijing Univ Posts & Telecommun, State Key Lab Informat Photon & Opt Commun, Beijing 100876, Peoples R China..
    Chen, Jiajia
    KTH, School of Electrical Engineering and Computer Science (EECS), Computer Science, Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Multi-tenant secret-key assignment over quantum key distribution networks2019In: Optics Express, E-ISSN 1094-4087, Vol. 27, no 3, p. 2544-2561Article in journal (Refereed)
    Abstract [en]

    Quantum key distribution (QKD) networks are promising to progress towards widespread practical deployment over existing fiber infrastructures in the near future. Given the high cost and difficulty of deploying QKD networks, multi-tenancy becomes promising to improve cost efficiency for future QKD networks. In a multi-tenant QKD network, multiple QKD tenants can sham the same QKD network infrastructure to obtain secret keys for securing their data transfer. Since the secret-key resources are finite and precious in QKD networks, how to achieve efficient multi-tenant secret-key assignment (MTKA) to satisfy the secret-key demands of multiple QKD tenants over QKD networks becomes a significant problem. In this regard, this study addresses the MTKA problem over QKD networks. A new multi-tenant QKD network architecture is proposed based on software defined networking (SDN) and quantum key pool (QKP) techniques. A secret-key rate sharing scheme is presented and a heuristic algorithm is designed to implement efficient MTKA over QKD networks. A new performance metric, namely matching degree (MD) that reflects the balance between QKD network secret-key resources and QKD tenant requests, is defined and evaluated. Simulation studies indicate that high QKD tenant requests accommodation and efficient secret-key resource usage can be achieved via maximizing the value of MD. 

  • 142.
    Caputo, Andrea
    et al.
    Univ Valencia, Inst Fis Corpuscular, Edificio Inst Invest,Catedrat Jose Beltran 2, Paterna 46980, Spain.;CSIC, Edificio Inst Invest,Catedrat Jose Beltran 2, Paterna 46980, Spain..
    Millar, Alexander J.
    Stockholm Univ, Dept Phys, Oskar Klein Ctr Cosmoparticle Phys, AlbaNova, S-10691 Stockholm, Sweden.;Nordita SU.
    Vitagliano, Edoardo
    Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA..
    Revisiting longitudinal plasmon-axion conversion in external magnetic fields2020In: Physical Review D, ISSN 1550-7998, E-ISSN 1550-2368, Vol. 101, no 12, article id 123004Article in journal (Refereed)
    Abstract [en]

    In the presence of an external magnetic field, the axion and the photon mix. In particular, the dispersion relation of a longitudinal plasmon always crosses the dispersion relation of the axion (for small axion masses), thus leading to a resonant conversion. Using thermal field theory, we concisely derive the axion emission rate, applying it to astrophysical and laboratory scenarios. For the Sun, depending on the magnetic field profile, plasmon-axion conversion can dominate over Primakoff production at low energies (less than or similar to 200 eV). This both provides a new axion source for future helioscopes and, in the event of discovery, would probe the magnetic field structure of the Sun. In the case of white dwarfs (WDs), plasmon-axion conversion provides a pure photon coupling probe of the axion, which may contribute significantly for low-mass WDs. Finally, we rederive and confirm the axion absorption rate of the recently proposed plasma haloscopes.

  • 143.
    Carannante, Valentina
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Biophysics. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Sandström, Niklas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Biophysics. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Olofsson, Karl
    KTH, Centres, Science for Life Laboratory, SciLifeLab. KTH, School of Engineering Sciences (SCI), Applied Physics, Biophysics.
    van Ooijen, Hanna
    KTH, School of Engineering Sciences (SCI), Applied Physics, Biophysics. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Hell, Birte
    KTH, Centres, Science for Life Laboratory, SciLifeLab. KTH, School of Engineering Sciences (SCI), Applied Physics, Biophysics.
    Wiklund, Martin
    KTH, Centres, Science for Life Laboratory, SciLifeLab. KTH, School of Engineering Sciences (SCI), Applied Physics, Biophysics.
    Önfelt, Björn
    KTH, Centres, Science for Life Laboratory, SciLifeLab. KTH, School of Engineering Sciences (SCI), Applied Physics, Biophysics. Center for Infectious Medicine, Dept. of Medicine Huddinge, Karolinska Institutet, Stockholm, Sweden.
    Generation of tumor spheroids in microwells to study NK cell cytotoxicity, infiltration and phenotype2023In: Methods in Cell Biology, Elsevier BV , 2023, Vol. 178, p. 195-208Chapter in book (Other academic)
    Abstract [en]

    The development of new immunotherapeutic drugs and combinatorial strategies requires the implementation of novel methods to test their efficacy in vitro. Here, we present a series of miniaturized in vitro assays to assess immune cell cytotoxic activity, infiltration, and phenotype in renal carcinoma spheroids with the use of a recently developed multichambered microwell chip. We provide protocols for tumor spheroid formation, NK cell culture, fluorescence labelling and imaging of live or fixed cells directly in the chip together with data analysis.

  • 144.
    Cardias, Ramon
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics. Instituto de Física, Universidade Federal Fluminense, 24210-346 Niterói, RJ, Brazil.
    Silva, Jhonatan dos Santos
    Faculdade de Física, Universidade Federal do Pará, 66075-110 Belém, PA, Brazil; Instituto Federal de Educação, Ciência e Tecnologia do Pará, 68250-000 Óbidos, PA, Brazil.
    Bergman, Anders
    Department of Physics and Astronomy, Uppsala University, Box 516, SE-75120 Uppsala, Sweden.
    Szilva, Attila
    Department of Physics and Astronomy, Uppsala University, Box 516, SE-75120 Uppsala, Sweden.
    Kvashnin, Yaroslav O.
    Department of Physics and Astronomy, Uppsala University, Box 516, SE-75120 Uppsala, Sweden.
    Fransson, Jonas
    Department of Physics and Astronomy, Uppsala University, Box 516, SE-75120 Uppsala, Sweden.
    Klautau, Angela B.
    Faculdade de Física, Universidade Federal do Pará, 66075-110 Belém, PA, Brazil; Departamento de Física da Universidade de Aveiro, 3810-183 Aveiro, Portugal.
    Eriksson, Olle
    Department of Physics and Astronomy, Uppsala University, Box 516, SE-75120 Uppsala, Sweden; Wallenberg Initiative Materials Science for Sustainability (WISE), Uppsala University Box 516, SE-75120 Uppsala, Sweden.
    Delin, Anna
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics. KTH, Centres, SeRC - Swedish e-Science Research Centre. Wallenberg Initiative Materials Science for Sustainability (WISE).
    Nordström, Lars
    Department of Physics and Astronomy, Uppsala University, Box 516, SE-75120 Uppsala, Sweden.
    Unraveling the connection between high-order magnetic interactions and local-to-global spin Hamiltonian in noncollinear magnetic dimers2023In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 108, no 22, article id 224408Article in journal (Refereed)
    Abstract [en]

    A spin Hamiltonian that characterizes interatomic interactions between spin moments is highly valuable in predicting and comprehending the magnetic properties of materials. Here, we explore a method for explicitly calculating interatomic exchange interactions in noncollinear configurations of magnetic materials considering only a bilinear spin Hamiltonian in a local scenario. Based on density-functional theory calculations of dimers adsorbed on metallic surfaces, and with a focus on the Dzyaloshinskii-Moriya interaction (DMI) which is essential for stabilizing chiral noncollinear magnetic states, we discuss the interpretation of the DMI when decomposed into microscopic electron and spin densities and currents. We clarify the distinct origins of spin currents induced in the system and their connection to the DMI. In addition, we reveal how noncollinearity affects the usual DMI, which is solely induced by spin-orbit coupling, and DMI-like interactions brought about by noncollinearity. We explain how the dependence of the DMI on the magnetic configuration establishes a connection between high-order magnetic interactions, enabling the transition from a local to a global spin Hamiltonian.

  • 145.
    Cardias, Ramon
    et al.
    KTH. Univ Paris Saclay, CEA, CNRS, SPEC, F-91191 Gif Sur Yvette, France..
    Szilva, Attila
    Uppsala Univ, Dept Phys & Astron, Box 516, SE-75120 Uppsala, Sweden..
    Bergman, Anders
    Uppsala Univ, Dept Phys & Astron, Box 516, SE-75120 Uppsala, Sweden..
    Kvashnin, Yaroslav
    Uppsala Univ, Dept Phys & Astron, Box 516, SE-75120 Uppsala, Sweden..
    Fransson, Jonas
    Uppsala Univ, Dept Phys & Astron, Box 516, SE-75120 Uppsala, Sweden..
    Streib, Simon
    Uppsala Univ, Dept Phys & Astron, Box 516, SE-75120 Uppsala, Sweden..
    Delin, Anna
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. KTH, Centres, SeRC - Swedish e-Science Research Centre.
    Katsnelson, Mikhail I.
    Radboud Univ Nijmegen, Inst Mol & Mat, Heyendaalseweg 135, NL-6525 AJ Nijmegen, Netherlands..
    Thonig, Danny
    Uppsala Univ, Dept Phys & Astron, Box 516, SE-75120 Uppsala, Sweden.;Örebro Univ, Sch Sci & Technol, Fakultetsgatan 1, SE-70281 Örebro, Sweden..
    Klautau, Angela Burlamaqui
    Univ Fed Para, Fac Fis, BR-66075110 Belem, PA, Brazil..
    Eriksson, Olle
    Uppsala Univ, Dept Phys & Astron, Box 516, SE-75120 Uppsala, Sweden.;Örebro Univ, Sch Sci & Technol, Fakultetsgatan 1, SE-70281 Örebro, Sweden..
    Nordstrom, Lars
    Uppsala Univ, Dept Phys & Astron, Box 516, SE-75120 Uppsala, Sweden..
    Comment on "Proper and improper chiral magnetic interactions"2022In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 105, no 2, article id 026401Article in journal (Refereed)
    Abstract [en]

    In a recent paper by dos Santos Dias et al. [Phys. Rev. B 103, L140408 (2021)], a critique of earlier works analyzing low-energy spin Hamiltonians is put forth. To be precise, it is the large noncollinear contributions to the Dzyaloshinskii-Moriya interaction (DMI) that is the main concern of dos Santos Dias et al. In this Comment, we clarify the microscopic mechanisms for the large DMI that can be found in noncollinear magnets. Furthermore, we outline the complementary nature of the different parametrizations of a spin Hamiltonian, with strengths and weaknesses of both approaches. Specifically, we stress the physical insight in the interpretation of the DMI, when decomposed in microscopic electron and spin densities and currents.

  • 146.
    Cardoso, Gabriel
    et al.
    KTH, School of Engineering Sciences (SCI), Mathematics (Dept.). Centre de Mathématiques Appliquées, Ecole polytechnique, UMR 7642, Palaiseau, France Electrophysiology and Heart Modeling Institute (IHU-Liryc), Pessac, France .
    Moulines, Eric
    KTH, School of Engineering Sciences (SCI), Mathematics (Dept.).
    Olsson, Jimmy
    KTH, School of Engineering Sciences (SCI), Mathematics (Dept.).
    Particle-based, Rapid Incremental Smoother Meets Particle Gibbs2023In: Statistica sinica, ISSN 1017-0405, E-ISSN 1996-8507, no 1Article in journal (Refereed)
    Abstract [en]

    The particle-based, rapid incremental smoother (PARIS) is a sequential Monte Carlo technique allowing for efficient online approximation of expectations of additive functionals under Feynman–Kac path distributions. Under weak assumptions, the algorithm has linear computational complexity and limited memory requirements. It also comes with a number of non-asymptotic bounds and convergence results. However, being based on self-normalised importance sampling, the PARIS estimator is biased; its bias is inversely proportional to the number of particles but has been found to grow linearly with the time horizon under appropriate mixing conditions. In this work, we propose the Parisian particle Gibbs (PPG) sampler, whose complexity is essentially the same as that of the PARIS and which significantly reduces the bias for a given computational complexity at the price of a modest increase in the variance. This method is a wrapper in the sense that it uses the PARIS algorithm in the inner loop of particle Gibbs to form a bias-reduced version of the targeted quantities. We substantiate the PPG algorithm with theoretical results, including new bounds on bias and variance as well as deviation inequalities. We illustrate our theoretical results with numerical experiments supporting our claims.

  • 147.
    Carlborg, Fredrik
    et al.
    KTH, School of Electrical Engineering (EES), Microsystem Technology.
    Moraga, Francesca
    KTH, School of Electrical Engineering (EES), Microsystem Technology.
    Saharil, Farizah
    KTH, School of Electrical Engineering (EES), Microsystem Technology.
    van der Wijngaart, Wouter
    KTH, School of Electrical Engineering (EES), Microsystem Technology.
    Haraldsson, Tommy
    KTH, School of Electrical Engineering (EES), Microsystem Technology.
    RAPID PERMANENT HYDROPHILIC AND HYDROPHOBIC PATTERNING OF POLYMER SURFACES VIA OFF-STOICHIOMETRY THIOL-ENE (OSTE) PHOTOGRAFTING2012In: Proceedings Micro Total Analysis Systems (muTAS) 2012, 2012, p. 677-679Conference paper (Refereed)
    Abstract [en]

    In this work we have developed a simple and robust method to permanently pattern alternating hydrophobic and hydrophilic surfaces in off-stoichiometry thiol-ene (OSTE) polymer microchannels. By being able to tune the number of unreacted thiol surface groups of the OSTE Thiol polymers and by taking advantage of spatially photo-controlled surface grafting of methacrylate monomers we achieve defined areas with contact angles from 20° to 115° within one single channel. The surface modification remains stable after storage in air (>2 months) or water (>24h).

    Download full text (pdf)
    hydrophilic OSTE
  • 148.
    Carlson, Annika
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Applied Electrochemistry.
    Shapturenka, Pavel
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Applied Electrochemistry.
    Eriksson, Björn
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Applied Electrochemistry.
    Lindbergh, Göran
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Applied Electrochemistry.
    Lagergren, Carina
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Applied Electrochemistry.
    Wreland Lindström, Rakel
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Applied Electrochemistry.
    Electrode parameters and operating conditions influencing the performance of anion exchange membrane fuel cells2018In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 277, p. 151-160Article in journal (Refereed)
    Abstract [en]

    A deeper understanding of porous electrode preparation and performance losses is necessary to advance the anion exchange membrane fuel cell (AEMFC) technology. This study has investigated the performance losses at 50 °C for varied: Tokuyama AS-4 ionomer content in the catalyst layer, Pt/C loading and catalyst layer thickness at the anode and cathode, relative humidity, and anode catalyst. The prepared gas diffusion electrodes in the interval of ionomer-to-Pt/C weight ratio of 0.4–0.8 or 29–44 wt% ionomer content show the highest performance. Varying the loading and catalyst layer thickness simultaneously shows that both the cathode and the anode influence the cell performance. The effects of the two electrodes are shown to vary with current density and this is assumed to be due to non-uniform current distribution throughout the electrodes. Further, lowering the relative humidity at the anode and cathode separately shows small performance losses for both electrodes that could be related to lowered ionomer conductivity. Continued studies are needed to optimize, and understand limitations of, each of the two electrodes to obtain improved cell performance.

  • 149.
    Carlson, Annika
    et al.
    KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Applied Electrochemistry.
    Shapturenka, Pavel
    KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Applied Electrochemistry.
    Lindbergh, Göran
    KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Applied Electrochemistry.
    Lagergren, Carina
    KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Applied Electrochemistry.
    Wreland Lindström, Rakel
    KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Applied Electrochemistry.
    Porous electrode optimization in anion-exchange membrane fuel cells2015In: Proceedings of the 6th European Fuel Cell - Piero Lunghi Conference, EFC 2015, ENEA , 2015, p. 221-222Conference paper (Refereed)
    Abstract [en]

    The performance of anion-exchange membrane fuel cells is highly dependent on electrode preparation. This study has investigated the influence of water content and catalyst to ionomer ratio in the electrode ink on in-situ fuel cell performance and the electrode microstructure using SEM. It has shown that changing the solvent composition affects the electrode properties. Higher water content in ink results in a lower power density. An increase in water content from 40 to 70 vol% shows a 500 mA/cm2 drop in current density. SEM analysis of newly prepared electrodes revealed an observable difference in the microstructure. This indicates that for high water volume the ionomer distribution in the electrode is very uneven. The results also indicate that lower ionomer content in the bulk of the structure lowers the cell performance, which may be explained by limited hydroxide transportation.

  • 150.
    Carlson, Magnus
    et al.
    KTH, School of Engineering Sciences (SCI), Mathematics (Dept.), Mathematics (Div.).
    Bauer, Tilman
    KTH, School of Engineering Sciences (SCI), Mathematics (Dept.), Mathematics (Div.).
    Tensor products of affine and formal abelian groupsManuscript (preprint) (Other academic)
    Abstract [en]

    In this paper we study tensor products of affine abelian group schemes over a perfect field k. We first prove that the tensor product G_1 ⊗ G_2 of two affine abelian group schemes G_1,G_2  over a perfect field k exists. We then describe the multiplicative and unipotent part of the group scheme G_1 ⊗G_2. The multiplicative part is described in terms of Galois modules over the absolute Galois group of k. We describe the unipotent part of G_1 ⊗ G_2 explicitly, using Dieudonn\'e theory in positive characteristic. We relate these constructions to previously studied tensor products of formal group schemes.

    Download full text (pdf)
    fulltext
1234567 101 - 150 of 1069
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf