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  • 20801.
    Sennerfors, Therese
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, YKI – Ytkemiska institutet.
    Interfacial behavior of polymer-nanoparticle complexes: Fundamentals and applications2002In: Encyclopedia of Surface and Colloid Science / [ed] Hubbard A, Marcel Dekker, 2002, p. 2733-2744Chapter in book (Refereed)
  • 20802.
    Sensi, Matteo
    et al.
    Università degli Studi di Modena e Reggio Emilia, Italy.
    Berto, Marcello
    Università degli Studi di Modena e Reggio Emilia, Italy.
    Candini, Andrea
    Istituto per la Sintesi Organica e la Fotoreattività (ISOF)−CNR, Italy; Istituto per la Microelettronica e Microsistemi (CNR-IMM), Italy.
    Liscio, Andrea
    Istituto per la Microelettronica e Microsistemi (CNR-IMM), Italy.
    Cossarizza, Andrea
    Università degli Studi di Modena e Reggio Emilia, Italy; .
    Beni, Valerio
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Biscarini, Fabio
    Università degli Studi di Modena e Reggio Emilia, Italy; Istituto Italiano di Tecnologia, Italy.
    Bortolotti, Carlo Augusto
    Università degli Studi di Modena e Reggio Emilia, Italy.
    Modulating the Faradic Operation of All-Printed Organic Electrochemical Transistors by Facile in Situ Modification of the Gate Electrode2019In: ACS Omega, E-ISSN 2470-1343, Vol. 4, no 3, p. 5374-5381Article in journal (Refereed)
    Abstract [en]

    Organic electrochemical transistors (OECTs) operated in the faradic regime were shown as outperforming transducers of bioelectric signals in vitro and in vivo. Fabrication by additive manufacturing techniques fosters OECTs as ideal candidates for point-of-care applications, as well as imposes limitations on the choice of materials and their processing conditions. Here, we address the question of how the response of fully printed OECTs depends on gate electrode material. Toward this end, we investigate the redox processes underlying the operation of OECTs under faradic regime, to show OECTs with carbon gate (C-gate) that exhibit no current modulation gate voltages <1.2 V. This is a hallmark that no interference with the faradic operation of the device enabled by redox processes occurs when operating C-gate OECTs in the low-voltage range as label-free biosensors for the detection of electroactive (bio)molecules. To tune the faradic response of the device, we electrodeposited Au on the carbon gate (Au-C-gate), obtaining a device that operates at lower gate voltage values than C-gate OECT. The presence of gold on the gate allowed further modification of the electrical performances by functionalization of the Au-C-gate with different self-assembled monolayers by fast potential-pulse-assisted method. Moreover, we show that the presence in the electrolyte solution of an external redox probe can be used to drive the faradic response of both C- and Au-C-gate OECTs, impacting on the gate potential window that yields effective drain current modulation. The results presented here suggest possible new strategies for controlling the faradic operation regime of OECTs sensors by chemical modification of the gate surface.

  • 20803.
    Sensi, Matteo
    et al.
    Università di Modena e Reggio Emilia, Italy.
    Migatti, Giulio
    Università di Modena e Reggio Emilia, Italy.
    Beni, Valerio
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    D'Alvise, Tommaso
    Max Planck Institute, Germany.
    Weil, Tanja
    Max Planck Institute, Germany.
    Berto, Marcello
    Università di Modena e Reggio Emilia, Italy.
    Greco, Pierpalo
    Università di Modena e Reggio Emilia, Italy; Center for Translational Neurophysiology-Istituto Italiano di Tecnologia,, Italy.
    Imbriano, Carol
    Università di Modena e Reggio Emilia, Italy.
    Biscarini, Fabio
    Università di Modena e Reggio Emilia, Italy; Center for Translational Neurophysiology-Istituto Italiano di Tecnologia, Italy.
    Bortolotti, Carlo
    Università di Modena e Reggio Emilia, Italy.
    Monitoring DNA Hybridization with Organic Electrochemical Transistors Functionalized with Polydopamine2022In: Macromolecular materials and engineering, ISSN 1438-7492, E-ISSN 1439-2054, Vol. 307, no 5, article id 2100880Article in journal (Refereed)
    Abstract [en]

    Organic electrochemical transistors (OECTs) are finding widespread application in biosensing, thanks to their high sensitivity, broad dynamic range, and low limit of detection. An OECT biosensor requires the immobilization of a biorecognition probe on the gate, or else on the channel, through several, often lengthy, chemical steps. In this work, a fast and straightforward way to functionalize the carbon gate of a fully screen-printed OECT by means of a polydopamine (PDA) film is presented. By chemical immobilization of an amine-terminated single-stranded oligonucleotide, containing the HSP70 promoter CCAAT sequence, on the PDA film, the detection of the complementary DNA strand is demonstrated. Furthermore, the specificity of the developed genosensor is assessed by comparing its response to the fully complementary strand with the one to partially complementary and noncomplementary oligonucleotides. The developed sensor shows a theoretical limit of detection (LOD) of 100 × 10−15 m and a dynamic range over four orders of magnitude. © 2022 The Authors.

  • 20804.
    Sentilles, Severine
    et al.
    Mälardalen University, Sweden.
    Ciccozzi, Frederico
    Mälardalen University, Sweden.
    Papatheocharous, Efi
    RISE - Research Institutes of Sweden, ICT, SICS.
    PROMOpedia: A web-content management-based encyclopedia of software property models2018In: Proceedings - International Conference on Software Engineering, 2018, p. 45-48Conference paper (Refereed)
    Abstract [en]

    The way software properties are defined, described, and measured, is different across different domains. When addressing these properties, several challenges commonly emerge, among which: synonymity, polysemy, paronymy, incomplete and inconsistent specification. In this paper we introduce PROMOpedia, an online encyclopedia, to tackle these challenges. PROMOpedia uses a web-content management system coupled with crowd-sourcing of scientific contents related to properties and their evaluation methods. The core concepts of PROMOpedia are built upon a property models ontology previously proposed by the authors, and is intended to target the needs of both researchers and practitioners. Website: http://www.mrtc.mdh.se/promopedia/ © 2018 Authors.

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  • 20805.
    Sentilles, Severine
    et al.
    Mälardalen University, Sweden.
    Papatheocharous, Efi
    RISE, Swedish ICT, SICS, Software and Systems Engineering Laboratory.
    Ciccozzi, Frederico
    Mälardalen University, Sweden.
    Petersen, Kai
    Blekinge Institute of Technology, Sweden.
    A Property Model Ontology2016In: Proceedings - 42nd Euromicro Conference on Software Engineering and Advanced Applications (SEAA 2016), IEEE Press, 2016, p. 165-172Conference paper (Refereed)
    Abstract [en]

    Efficient development of high quality software is tightly coupled to the ability of quickly taking complex decisions based on trustworthy facts. In component-based software engineering, the decisions related to selecting the most suitable component among functionally-equivalent ones are of paramount importance. Despite sharing the same functionality, components differ in terms of their extra-functional properties. Therefore, to make informed selections, it is crucial to evaluate extra-functional properties in a systematic way. To date, many properties and evaluation methods that are not necessarily compatible with each other exist. The property model ontology presented in this paper represents the first step towards providing a systematic way to describe extra-functional properties and their evaluation methods, and thus making them comparable. This is beneficial from two perspectives. First, it aids researchers in identifying comparable property models as a guide for empirical evaluations. Second, practitioners are supported in choosing among alternative evaluation methods for the properties of their interest. The use of the ontology is illustrated by instantiating a subset of property models relevant in the automotive domain.

  • 20806.
    Sentilles, Séverine
    et al.
    Mälardalen University, Sweden.
    Papatheocharous, Efi
    RISE - Research Institutes of Sweden, ICT, SICS.
    Ciccozzi, Federico
    Mälardalen University, Sweden.
    What do we know about software security evaluation?: A preliminary study2018In: CEUR Workshop Proceedings, CEUR-WS , 2018, p. 44-51Conference paper (Refereed)
    Abstract [en]

    —In software development, software quality is nowadays acknowledged to be as important as software functionality and there exists an extensive body-of-knowledge on the topic. Yet, software quality is still marginalized in practice: there is no consensus on what software quality exactly is, how it is achieved and evaluated. This work investigates the state-of-the-art of software quality by focusing on the description of evaluation methods for a subset of software qualities, namely those related to software security. The main finding of this paper is the lack of information regarding fundamental aspects that ought to be specified in an evaluation method description. This work follows up the authors’ previous work on the Property Model Ontology by carrying out a systematic investigation of the state-of-the-art on evaluation methods for software security. Results show that only 25% of the papers studied provide enough information on the security evaluation methods they use in their validation processes, whereas the rest of the papers lack important information about various aspects of the methods (e.g., benchmarking and comparison to other properties, parameters, applicability criteria, assumptions and available implementations). This is a major hinder to their further use.

  • 20807.
    Seoane, Fernando
    et al.
    University of Borås, Sweden; Karolinska University hospital, Sweden; Karolinska Institutet, Sweden.
    Soroudi, Azadeh
    University of Borås, Sweden.
    Lu, Ke
    Chalmers University of Technology, Sweden.
    Nilsson, David
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Nilsson, Marie
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Abtahi, Farhad
    KTH Royal Institute of Technology, Sweden; Karolinska Institutet, Sweden.
    Skrifvars, Mikael
    University of Borås, Sweden.
    Textile-Friendly Interconnection between Wearable Measurement Instrumentation and Sensorized Garments-Initial Performance Evaluation for Electrocardiogram Recordings.2019In: Sensors, E-ISSN 1424-8220, Vol. 19, no 20, article id E4426Article in journal (Refereed)
    Abstract [en]

    The interconnection between hard electronics and soft textiles remains a noteworthy challenge in regard to the mass production of textile-electronic integrated products such as sensorized garments. The current solutions for this challenge usually have problems with size, flexibility, cost, or complexity of assembly. In this paper, we present a solution with a stretchable and conductive carbon nanotube (CNT)-based paste for screen printing on a textile substrate to produce interconnectors between electronic instrumentation and a sensorized garment. The prototype connectors were evaluated via electrocardiogram (ECG) recordings using a sensorized textile with integrated textile electrodes. The ECG recordings obtained using the connectors were evaluated for signal quality and heart rate detection performance in comparison to ECG recordings obtained with standard pre-gelled Ag/AgCl electrodes and direct cable connection to the ECG amplifier. The results suggest that the ECG recordings obtained with the CNT paste connector are of equivalent quality to those recorded using a silver paste connector or a direct cable and are suitable for the purpose of heart rate detection.

  • 20808.
    Sepehri, Sobhan
    et al.
    Chalmers University of Technology, Sweden.
    Agnarsson, Björn
    Chalmers University of Technology, Sweden.
    Torre, Teresa
    Uppsala University, Sweden.
    Schneiderman, Justin
    Chalmers University of Technology, Sweden; University of Gothenburg, Sweden.
    Blomgren, Jakob
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Jesorka, Aldo
    Chalmers University of Technology, Sweden.
    Johansson, Christer
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Nilsson, Mats
    Stockholm University, Sweden.
    Albert, Jan
    Karolinska University Hospital, Sweden; Karolinska Institute, Sweden.
    Strømme, Maria
    Uppsala University, Sweden.
    Winkler, Dan
    Chalmers University of Technology, Sweden.
    Kalaboukhov, Alexei
    Chalmers University of Technology, Sweden.
    Characterization of Binding of Magnetic Nanoparticles to Rolling Circle Amplification Products by Turn-On Magnetic Assay2019In: Biosensors, ISSN 2079-6374, Vol. 9, no 3Article in journal (Refereed)
    Abstract [en]

    The specific binding of oligonucleotide-tagged 100 nm magnetic nanoparticles (MNPs) to rolling circle products (RCPs) is investigated using our newly developed differential homogenous magnetic assay (DHMA). The DHMA measures ac magnetic susceptibility from a test and a control samples simultaneously and eliminates magnetic background signal. Therefore, the DHMA can reveal details of binding kinetics of magnetic nanoparticles at very low concentrations of RCPs. From the analysis of the imaginary part of the DHMA signal, we find that smaller MNPs in the particle ensemble bind first to the RCPs. When the RCP concentration increases, we observe the formation of agglomerates, which leads to lower number of MNPs per RCP at higher concentrations of RCPs. The results thus indicate that a full frequency range of ac susceptibility observation is necessary to detect low concentrations of target RCPs and a long amplification time is not required as it does not significantly increase the number of MNPs per RCP. The findings are critical for understanding the underlying microscopic binding process for improving the assay performance. They furthermore suggest DHMA is a powerful technique for dynamically characterizing the binding interactions between MNPs and biomolecules in fluid volumes.

  • 20809.
    Sepehri, Sobhan
    et al.
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Andersson, Johanna
    RISE Research Institutes of Sweden, Bioeconomy and Health, Agriculture and Food.
    Schaller, Vincent
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Grüttner, Cordula
    Micromod Partikeltechnologie GmbH, Germany.
    Stading, Mats
    RISE Research Institutes of Sweden, Bioeconomy and Health, Agriculture and Food.
    Johansson, Christer
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Remote Sensing of the Nano-Rheological Properties of Soft Materials Using Magnetic Nanoparticles and Magnetic AC Susceptometry2023In: Nanomaterials, E-ISSN 2079-4991, Vol. 13, no 1Article in journal (Refereed)
    Abstract [en]

    We have developed a nano-rheological characterization tool to extract the frequency- and scale-dependent rheological properties of soft materials during oral processing. Taking advantage of AC susceptometry, the dynamic magnetization of magnetic nanoparticles blended in the matrix material is measured. The magnetic AC susceptibility spectra of the particles are affected by the viscosity and mechanical modulus of the matrix material and provide the rheological properties of the matrix. Commercially available iron-oxide magnetic nanoparticles with 80 and 100 nm particle sizes are used as tracers in the frequency range of 1 Hz&ndash;10 kHz. The AC susceptibility is measured using two differentially connected coils, and the effects of the sample temperature and distance with respect to the detection coils are investigated. The developed measurement setup shows the feasibility of remote nano-rheological measurements up to 2 cm from the coil system, which can be used to, e.g., monitor the texture of matrix materials during oral processing.

  • 20810.
    Sepehri, Sobhan
    et al.
    Chalmers University of Technology, Sweden.
    Eriksson, Emil
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Kalaboukhov, Alexei
    Chalmers University of Technology, Sweden.
    Zardán Gómez de la Torre, Teresa
    Uppsala University, Sweden.
    Kustanovich, Kiryl
    Chalmers University of Technology, Sweden.
    Jesorka, Aldo
    Chalmers University of Technology, Sweden.
    Schneiderman, Justin F.
    Chalmers University of Technology, Sweden ; University of Gothenburg, Sweden.
    Blomgren, Jakob
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Johansson, Christer
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Strømme, Maria
    Uppsala University, Sweden.
    Winkler, Dag
    Chalmers University of Technology, Sweden.
    Volume-amplified magnetic bioassay integrated with microfluidic sample handling and high-Tc SQUID magnetic readout2017In: APL Bioengineering, Vol. 2, no 1, article id 016102Article in journal (Refereed)
    Abstract [en]

    A bioassay based on a high-Tc superconducting quantum interference device (SQUID) reading out functionalized magnetic nanoparticles (fMNPs) in a prototype microfluidic platform is presented. The target molecule recognition is based on volume amplification using padlock-probe-ligation followed by rolling circle amplification (RCA). The MNPs are functionalized with single-stranded oligonucleotides, which give a specific binding of the MNPs to the large RCA coil product, resulting in a large change in the amplitude of the imaginary part of the ac magnetic susceptibility. The RCA products from amplification of synthetic Vibrio cholera target DNA were investigated using our SQUID ac susceptibility system in microfluidic channel with an equivalent sample volume of 3 μl. From extrapolation of the linear dependence of the SQUID signal versus concentration of the RCA coils, it is found that the projected limit of detection for our system is about 1.0 × 105 RCA coils (0.2 × 10−18 mol), which is equivalent to 66 fM in the 3 μl sample volume. This ultra-high magnetic sensitivity and integration with microfluidic sample handling are critical steps towards magnetic bioassays for rapid detection of DNA and RNA targets at the point of care.

  • 20811.
    Sepehri, Sobhan
    et al.
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Trey, Stacy
    RISE Research Institutes of Sweden, Materials and Production, Polymeric Materials and Composites.
    Lake, Kajsa
    2dFab AB, Sweden.
    Cumming, Carl
    Trelleborg Mixing Forsheda AB, Sweden.
    Johansson, Christer
    RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.
    Non-Destructive Evaluation of Thermal Aging in EPDM Rubber Using Electromagnetic Techniques2023In: Materials, E-ISSN 1996-1944, Vol. 16, no 15, p. 5471-5471Article in journal (Refereed)
    Abstract [en]

    This study investigates the use of eddy-current technology and impedance spectroscopy in sensing the change in rubber properties after it is exposed to accelerated thermal aging. The thermal aging process, by application of temperature and pressure over time, of ethylene propylene diene monomer (EPDM) rubbers containing both carbon black (CB) and graphene are investigated. Both eddy-current sensing and electrical impedance measurement techniques were used for electromagnetic analysis. Both methods measure the in- and out-of-phase responses as a function of excitation frequency at room temperature. The measurements were performed before and after the aging process. The electrical percolation threshold was detected in the rubber samples by varying the CB content from 0 to 40 wt%. In the rubber sample containing 30 wt% CB, 0–5 wt% of the CB was replaced with graphene flakes. The substitution of graphene for CB in the EPDM rubber formulation provided an enhanced eddy-current and electrical impedance response. The findings demonstrate the feasibility of employing electromagnetic analysis techniques to investigate the extent of aging.

  • 20812.
    Sepehri, Sobhan
    et al.
    MC2, Sweden; Chalmers University of Technology, Sweden.
    Zardán Gómez De La Torre, T.
    Uppsala University, Sweden.
    Schneiderman, J. F.
    MC2, Sweden; University of Gothenburg,Sweden.
    Blomgren, Jakob
    RISE - Research Institutes of Sweden (2017-2019), ICT, Acreo.
    Jesorka, A.
    Stockholm University, Sweden.
    Johansson, Christer
    Karolinska University Hospital, Sweden; Karolinska Institute, Sweden.
    Nilsson, M.
    Stockholm University, Sweden.
    Albert, J.
    Stockholm University, Sweden; Karolinska University Hospital, Sweden.
    Strømme, Maria
    Uppsala University, Sweden.
    Winkler, Dag
    MC2, Sweden.
    Kalaboukhov, A.
    MC2, Sweden.
    Homogeneous Differential Magnetic Assay2019In: ACS Sensors, E-ISSN 2379-3694, Vol. 4, no 9, p. 2381-8Article in journal (Refereed)
    Abstract [en]

    Assays are widely used for detection of various targets, including pathogens, drugs, and toxins. Homogeneous assays are promising for the realization of point-of-care diagnostics as they do not require separation, immobilization, or washing steps. For low concentrations of target molecules, the speed and sensitivity of homogeneous assays have hitherto been limited by slow binding kinetics, time-consuming amplification steps, and the presence of a high background signal. Here, we present a homogeneous differential magnetic assay that utilizes a differential magnetic readout that eliminates previous limitations of homogeneous assays. The assay uses a gradiometer sensor configuration combined with precise microfluidic sample handling. This enables simultaneous differential measurement of a positive test sample containing a synthesized Vibrio cholerae target and a negative control sample, which reduces the background signal and increases the readout speed. Very low concentrations of targets down to femtomolar levels are thus detectable without any additional amplification of the number of targets. Our homogeneous differential magnetic assay method opens new possibilities for rapid and highly sensitive diagnostics at the point of care. 

  • 20813.
    Sepman, Alexey
    et al.
    RISE Research Institutes of Sweden, Bioeconomy and Health, Biorefinery and Energy.
    Fredriksson, Christian
    LKAB, Sweden.
    Ögren, Yngve
    RISE Research Institutes of Sweden, Bioeconomy and Health, Biorefinery and Energy.
    Wiinikka, Henrik
    RISE Research Institutes of Sweden, Bioeconomy and Health, Biorefinery and Energy.
    Laser-Based, Optical, and Traditional Diagnostics of NO and Temperature in 400 kW Pilot-Scale Furnace2021In: Applied Sciences, E-ISSN 2076-3417, Vol. 11, no 15, article id 7048Article in journal (Refereed)
    Abstract [en]

    A fast sensor for simultaneous high temperature (above 800 K) diagnostics of nitrogen oxide (NO) concentration and gas temperature (T) based on the spectral fitting of low-resolution NO UV absorption near 226 nm was applied in pilot-scale LKAB’s Experimental Combustion Furnace (ECF). The experiments were performed in plasma and/or fuel preheated air at temperatures up to 1550 K, which is about 200 K higher than the maximal temperature used for the validation of the developed UV NO sensor previously. The UV absorption NO and T measurements are compared with NO probe and temperature measurements via suction pyrometry and tuneable diode laser absorption (TDL) using H2O transitions at 1398 nm, respectively. The agreement between the NO UV and NO probe measurements was better than 15%. There is also a good agreement between the temperatures obtained using laser-based, optical, and suction pyrometer measurements. Comparison of the TDL H2O measurements with the calculated H2O concentrations demonstrated an excellent agreement and confirms the accuracy of TDL H2O measurements (better than 10%). The ability of the optical and laser techniques to resolve various variations in the process parameters is demonstrated.

  • 20814.
    Sepman, Alexey
    et al.
    RISE Research Institutes of Sweden, Bioeconomy and Health, Biorefinery and Energy.
    Gullberg, Marcus
    RISE Research Institutes of Sweden, Bioeconomy and Health, Biorefinery and Energy.
    Wiinikka, Henrik
    RISE Research Institutes of Sweden, Bioeconomy and Health, Biorefinery and Energy.
    Measuring NO and temperature in plasma preheated air using UV absorption spectroscopy2020In: Applied physics. B, Lasers and optics (Print), ISSN 0946-2171, E-ISSN 1432-0649, Vol. 126, no 6, article id 100Article in journal (Refereed)
    Abstract [en]

    A new fast sensor for simultaneous high temperature diagnostics (above 800 K) of nitrogen oxide (NO) concentration and gas temperature (T) was developed based on the spectral fitting of low-resolution NO UV absorption near 226 nm. The sensor was intended for process control in future low-carbon footprint heavy process industries using renewable powered electro fuels (e.g. H2, NH3) or plasma torches as heat source. Due to excitation of molecular vibration, the shape of the selected NO feature, including (0, 0), (1, 1), and (2, 2) vibrational transitions of the A2Σ+ − X2Π2 electronic system had a strong temperature sensitivity at temperatures above 800 K. The fitting was made using the well-known NO molecular constants of the A2Σ+ − X2Π2 electronic system. To reduce the computational time, a library of the molecular spectra calculated at different temperatures was created. The fitting of an experimental spectrum representing the convolution of the instrument line function of the spectrometer with the molecular spectra was performed using the pre-calculated library spectra. Based on comparison with conventional measurement methods, the accuracy of the developed sensor was within 15% for NO and about 40 K for T, clearly showing the potential for fast in situ diagnostics in hot process gases. © 2020, The Author(s).

  • 20815.
    Sepman, Alexey
    et al.
    RISE Research Institutes of Sweden, Bioeconomy and Health, Biorefinery and Energy.
    Malhotra, Jaskaran Singh
    RISE Research Institutes of Sweden, Bioeconomy and Health, Biorefinery and Energy. DTU Technical University of Denmark, Denmark.
    Wennebro, Jonas
    RISE Research Institutes of Sweden, Bioeconomy and Health, Biorefinery and Energy.
    Wiinikka, Henrik
    RISE Research Institutes of Sweden, Bioeconomy and Health, Biorefinery and Energy.
    Iron as recyclable electrofuel: Effect on particle morphology from multiple combustion-regeneration cycles2024In: Combustion and Flame, ISSN 0010-2180, E-ISSN 1556-2921, Vol. 259, article id 113137Article in journal (Refereed)
    Abstract [en]

    This work describes the morphological and material changes in the iron powder during four regeneration-combustion cycles. The regeneration in H2 and combustion in air experiments were made in a fluidized bed (FB) and an entrained flow reactor (EFR), respectively. The average size of the iron oxide particles more than doubled between the first and fourth combustion cycles, and many of the particles were hollow. The regeneration step did not change the size of the particles but increased their porosity. A mechanism is proposed that describes the formation of large-diameter hollow particles which increases as a function of the regeneration-combustion cycles. The observed increase in particle size and the change in particle morphology complicates the iron fuel concept, as it leads to a degradation of the structural stability of the particle with time.

  • 20816.
    Sepman, Alexey
    et al.
    RISE Research Institutes of Sweden, Bioeconomy and Health, Biorefinery and Energy.
    Thorin, Emil
    Umeå University, Sweden.
    Ögren, Yngve
    RISE Research Institutes of Sweden, Bioeconomy and Health, Biorefinery and Energy.
    Ma, Charlie
    Umeå University, Sweden.
    Carlborg, Markus
    Umeå University, Sweden.
    Wennebro, Jonas
    RISE Research Institutes of Sweden, Bioeconomy and Health, Biorefinery and Energy.
    Broström, Markus
    Umeå University, Sweden.
    Wiinikka, Henrik
    RISE Research Institutes of Sweden, Bioeconomy and Health, Biorefinery and Energy. Luleå University of Technology, Sweden.
    Schmidt, Florian
    Umeå University, Sweden.
    Laser-based detection of methane and soot during entrained-flow biomass gasification2022In: Combustion and Flame, ISSN 0010-2180, E-ISSN 1556-2921, Vol. 237, article id 111886Article in journal (Refereed)
    Abstract [en]

    Methane is one of the main gas species produced during biomass gasification and may be a desired or undesired product. Syngas CH4 concentrations are typically &gt;5 vol-% (when desired) and 1–3 vol-% even when efforts are made to minimize it, while thermochemical equilibrium calculations (TEC) predict complete CH4 decomposition. How CH4 is generated and sustained in the reactor core is not well understood. To investigate this, accurate quantification of the CH4 concentration during the process is a necessary first step. We present results from rapid in situ measurements of CH4, soot volume fraction, H2O and gas temperature in the reactor core of an atmospheric entrained-flow biomass gasifier, obtained using tunable diode laser absorption spectroscopy (TDLAS) in the near-infrared (1.4 µm) and mid-infrared (3.1 µm) region. An 80/20 wt% mixture of forest residues and wheat straw was converted using oxygen-enriched air (O2&gt;21 vol%) as oxidizer, while the global air-fuel equivalence ratio (AFR) was set to values between 0.3 and 0.7. Combustion at AFR 1.3 was performed as a reference. The results show that the CH4 concentration increased from 1 to 3 vol-% with decreasing AFR, and strongly correlated with soot production. In general, the TDLAS measurements are in good agreement with extractive diagnostics at the reactor outlet and TEC under fuel-lean conditions, but deviate significantly for lower AFR. Detailed 0D chemical reaction kinetics simulations suggest that the CH4 produced in the upper part of the reactor at temperatures &gt;1700 K was fully decomposed, while the CH4 in the final syngas originated from the pyrolysis of fuel particles at temperatures below 1400 K in the lower section of the reactor core. It is shown that the process efficiency was significantly reduced due to the C and H atoms bound in methane and soot. © 2021 The Authors

  • 20817.
    Sepman, Alexey
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energy Technology Center.
    Ögren, Yngve
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energy Technology Center. Luleå University of Technology, Sweden.
    Gullberg, Marcus
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energy Technology Center.
    Wiinikka, Henrik
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energy Technology Center. Luleå University of Technology, Sweden.
    Development of TDLAS sensor for diagnostics of CO, H2O and soot concentrations in reactor core of pilot-scale gasifier2016In: Applied physics. B, Lasers and optics (Print), ISSN 0946-2171, E-ISSN 1432-0649, Vol. 122, no 2, p. 1-12, article id 29Article in journal (Refereed)
    Abstract [en]

    This paper reports on the development of the tunable diode laser absorption spectroscopy sensor near 4350 cm−1 (2298 nm) for measurements of CO and H2O mole fractions and soot volume fraction under gasification conditions. Due to careful selection of the molecular transitions [CO (υ″ = 0 → υ′ = 2) R34–R36 and H2O at 4349.337 cm−1], a very weak (negligible) sensitivity of the measured species mole fractions to the temperature distribution inside the high-temperature zone (1000 K < T < 1900 K) of the gasification process is achieved. The selected transitions are covered by the tuning range of single diode laser. The CO and H2O concentrations measured in flat flames generally agree better than 10 % with the results of 1-D flame simulations. Calibration-free absorption measurements of studied species in the reactor core of atmospheric pilot-scale entrained-flow gasifier operated at 0.1 MW power are reported. Soot concentration is determined from the measured broadband transmittance. The estimated uncertainties in the reactor core CO and H2O measurements are 15 and 20 %, respectively. The reactor core average path CO mole fractions are in quantitative agreement with the µGC CO concentrations sampled at the gasifier output.

  • 20818.
    Sepman, Alexey
    et al.
    RISE - Research Institutes of Sweden, Bioeconomy, ETC Energy Technology Center.
    Ögren, Yngve
    RISE - Research Institutes of Sweden, Bioeconomy, ETC Energy Technology Center.
    Qu, Zhechao
    Umeå University, Sweden.
    Wiinikka, Henrik
    RISE - Research Institutes of Sweden, Bioeconomy, ETC Energy Technology Center.
    Schmidt, Florian M.
    Umeå University, Sweden.
    Real-time in situ multi-parameter TDLAS sensing in the reactor core of an entrained-flow biomass gasifier2017In: Proceedings of the Combustion Institute, ISSN 1540-7489, E-ISSN 1873-2704, Vol. 36, no 3, p. 4541-4548Article in journal (Refereed)
    Abstract [en]

    Tunable diode laser absorption spectroscopy (TDLAS) was employed to measure several important process parameters at two different locations inside the reactor of an atmospheric air-blown 0.1 MW biomass gasifier. Direct TDLAS at 2298 nm was employed for CO and water calibration-free scanned wavelength modulation spectroscopy at 1398 nm for H2O and gas temperature and direct TDLAS at 770 nm for gaseous elemental potassium K(g) under optically thick conditions which correspond the first in situ measurements of K(g) and temperature in a reactor core and in biomass gasification respectively. Actual average temperatures in the reactor core were significantly higher than the uncorrected thermocouple measurements in the gas stream. The CO concentrations at the lower optical access port were comparable to those obtained by GC at the exhaust. In gasification mode similar H2O values were obtained by the two different TDLAS instruments. The reaction time was faster for peat than for stem wood.

  • 20819.
    Sepman, Alexey
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Bioeconomy, ETC Energy Technology Center.
    Ögren, Yngve
    RISE - Research Institutes of Sweden (2017-2019), Bioeconomy, ETC Energy Technology Center.
    Qu, Zhechau
    Umeå University, Sweden; PTB Physikalisch-Technische Bundesanstalt, Germany.
    Wiinikka, Henrik
    RISE - Research Institutes of Sweden (2017-2019), Bioeconomy, ETC Energy Technology Center.
    Schmidt, Florian
    Umeå University, Sweden.
    Tunable diode laser absorption spectroscopy diagnostics of potassium, carbon monoxide, and soot in oxygen-enriched biomass combustion close to stoichiometry2019In: Energy & Fuels, ISSN 0887-0624, E-ISSN 1520-5029, Vol. 33, no 11, p. 11795-11803Article in journal (Refereed)
    Abstract [en]

    Combustion facilities run on pulverized biomass often exhibit fluctuations in fuel feeding and, thus, equivalence ratio and would benefit from fast process control based on optical λ sensors installed in the reactor core. The conversion of softwood powder is investigated in an atmospheric entrained-flow reactor (EFR) operated close to stoichiometry using two different burners (swirl and jet) and three oxygen concentrations (21, 30, and 40%). Tunable diode laser absorption spectroscopy (TDLAS) is used to conduct time-resolved (0.1-1 s) in situ measurements of the gas temperature, carbon monoxide (CO), water vapor (H2O), gaseous atomic potassium [K(g)], and soot volume fraction in the lower part of the reactor core and in the exhaust of the EFR. At both locations, the measurement parameters show significant, correlating fluctuations. The local equivalence ratio is derived from a comparison of measured CO and H2O concentrations (for fuel-rich and fuel-lean conditions, respectively) to thermodynamic equilibrium calculations (TEC) and found to vary in a wide range (0.8-1.3). Soot production decreases with an increasing local equivalence ratio and oxygen enrichment and is lower for the swirl compared to the jet burner. The measured K(g) concentrations follow the general behavior predicted by TEC around stoichiometry. In the relevant temperature range (1100-1700 K), K(g) is 2-4 orders of magnitude higher under fuel-rich than fuel-lean conditions, with a sharp transition at stoichiometry. While K(g) concentrations are lower than TEC in the reactor core and under fuel-rich conditions, excellent agreement is found at the exhaust after complete fuel conversion. Precise, wide dynamic range detection of K(g) using TDLAS enables discrimination between fuel-rich and fuel-lean conditions and has the potential for lambda sensing close to the hot reaction zone of combustion plants.

  • 20820.
    Sepman, Alexey
    et al.
    RISE Research Institutes of Sweden, Bioeconomy and Health, Biorefinery and Energy.
    Ögren, Yngve
    RISE Research Institutes of Sweden, Bioeconomy and Health, Biorefinery and Energy.
    Wennebro, Jonas
    RISE Research Institutes of Sweden, Bioeconomy and Health, Biorefinery and Energy.
    Wiinikka, Henrik
    RISE Research Institutes of Sweden, Bioeconomy and Health, Biorefinery and Energy.
    Simultaneous diagnostics of fuel moisture content and equivalence ratio during combustion of liquid and solid fuels2022In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 324, article id 119731Article in journal (Refereed)
    Abstract [en]

    The precise control of bio-based combustion is challenging due to the varying composition and moisture content of the fuels, difficulties in achieving stable fuel feeding, and complex underlying thermochemical processes. We present simultaneous online diagnostics of two combustion parameters, the equivalence ratio and fuel moisture content, in a pilot-scale environment. The parameters were evaluated by analysing the H2O and CO2 concentrations. These were measured using a Fourier transform infrared (FTIR) spectrometer (exhaust) and tuneable diode laser (TDL) absorption spectroscopy (combustion chamber) in pilot-scale diesel and pulverized biomass combustion. Liquid H2O was added into the combustion chamber to represent fuel moisture. The equivalence ratio of diesel and wood combustion was varied by adjusting the flows of combustion air in a staged manner or by using rapid periodic variations (on the order of seconds). The moisture fuel levels calculated using the measured fuel and water flow rates (flow method) and the FTIR and TDL H2O and CO2 concentrations agree within 3% (absolute) for both fuels. The TDL and FTIR equivalence ratios agreed quantitatively for both diesel and biomass combustion. However, close to stoichiometry, the TDL values for biomass are up to 15% lower than the FTIR values, indicating ongoing combustion at the location of the TDL measurements. © 2022 The Authors

  • 20821.
    Sepman, Alexey
    et al.
    RISE - Research Institutes of Sweden, Bioeconomy, ETC Energy Technology Center.
    Ögren, Yngve
    RISE - Research Institutes of Sweden, Bioeconomy, ETC Energy Technology Center.
    Wiinikka, Henrik
    RISE - Research Institutes of Sweden, Bioeconomy, ETC Energy Technology Center.
    Optical techniques for characterizing the biomass particle flow fluctuations in lab- and pilot-scale thermochemical systems2017In: Powder Technology, ISSN 0032-5910, E-ISSN 1873-328X, Vol. 313, p. 129-134Article in journal (Refereed)
    Abstract [en]

    The work demonstrates the performance of the optical extinction technique for real-time diagnostics of the fluctuations in biomass particle flows. The online measurements of fluctuations of density were used to determine the biomass particle mass flow fluctuations. Biomass flows were produced using laboratory biomass particle feeder (mass flux up to 10 g/min) and the hopper-screw feeding system of the pilot-scale entrained flow rector, mass flux up to 500 g/min, located at SP ETC in Piteå. The experiments showed that the time-averaged extinction appeared to be linearly related to the real particle mass flow. The relatively fast variations in biomass feeding rates measured using the extinction technique were confirmed by fast balance measurements (in laboratory feeder experiments) and by real-time tunable diode laser CO and H2O concentrations measured in the reactor core of the entrained flow gasifier.

  • 20822. Sepp, H
    et al.
    Höijer, K
    Wendin, K
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Food and Bioscience.
    Barns matvanor ur ett sensoriskt och pedagogiskt perspektiv2016Report (Other academic)
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  • 20823.
    Sepp, R
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SIK – Svenska livmedelsinstitutet.
    Gluten : a bibliography of non-food apllications1983Report (Refereed)
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  • 20824.
    Seppä, Santeri Jeremias
    et al.
    MIKES Centre for Metrology and Accreditation, Finland.
    Korpelainen, Virpi
    MIKES Centre for Metrology and Accreditation, Finland.
    Bergstrand, Sten
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Massa, kraft, längd och tryck.
    Karlsson, Helge
    Justervesenet, Norway.
    Lillepea, Lauri
    AS Metrosert, Estonia.
    Lassila, Antti
    MIKES Centre for Metrology and Accreditation, Finland.
    Intercomparison of lateral scales of scanning electron microscopes and atomic force microscopes in research institutes in Northern Europe2014In: Measurement science and technology, ISSN 0957-0233, E-ISSN 1361-6501, Vol. 25, no 4, article id 44013Article in journal (Refereed)
    Abstract [en]

    An intercomparison of lateral scales of scanning electron microscopes (SEM) and atomic force microscopes (AFM) in various research laboratories in Northern Europe was organized by the local national metrology institutes. In this paper are presented the results of the comparison, with also an example uncertainty budget for AFM grating pitch measurement. Grating samples (1D) were circulated among the participating laboratories. The participating laboratories were also asked about the calibration of their instruments. The accuracy of the uncertainty estimates seemed to vary largely between the laboratories, and for some laboratories the appropriateness of the calibration procedures could be considered. Several institutes (60% of all results in terms of En value) also had good comprehension of their measurement capability. The average difference from reference value was 6.7 and 10.0 nm for calibrated instruments and 20.6 and 39.9 nm for uncalibrated instruments for 300 nm and 700 nm gratings, respectively. The correlation of the results for both nominally 300 and 700 nm gratings shows that a simple scale factor calibration would have corrected a large part of the deviations from the reference values.

  • 20825.
    Seppänen, R
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, YKI – Ytkemiska institutet.
    Durability of the sizing degree of AKD and ASA sized pilot papers during storage investigated by contact angle measurements and ToF-SIMS2009In: Journal of Dispersion Science and Technology, ISSN 0193-2691, E-ISSN 1532-2351, Vol. 30, no 3, p. 937-948Article in journal (Refereed)
    Abstract [en]

    The influence of storage conditions on the sizing degree of AKD and ASA sized pilot papers was evaluated. A number of pilot papers sized with AKD or ASA were prepared from ECF bleached pulp fibers, unfilled and filled with 20% PCC, respectively and investigated in terms of sizing degree over a period of several months. The papers were stored at 23 C and 50% RH either wrapped in aluminium foil or as separate sheets exposed to open atmosphere. The unfilled papers stored protected from ambient atmosphere after papermaking showed only a marginal reduction in sizing during prolonged storage. Only the paper having the lowest AKD-dosage suffered from reduced water-resistance, the Cobb60-value changed from 34 to 79 g/m2. The PCC filled papers stored in the same conditions lost some of their sizing, to a higher extent in the case of AKD than for ASA sized papers. This was attributed to the further hydrolysis of the size catalyzed by PCC. In comparison, the sizing of the papers stored as separate sheets dropped significantly even after a few weeks in storage. In the end of the storage the AKD papers, particularly the unfilled ones had lost their sizing efficiency to a clearly higher extent than the ASA papers. The reduction in the sizing level occurred mainly during the first five weeks for the unfilled ASA and AKD papers, after which the process continued at a slower rate. The ToF-SIMS analysis revealed that both AKD and hydrolyzed AKD, the latter being the major portion, were present at the outermost surface of the unfilled AKD sized papers, but in significantly lower levels than in the case of the corresponding protected papers. In other words, a significant loss of AKD mass had occurred for the papers exposed to an open atmosphere. This was attributed to migration of AKD. The results demonstrated that ASA sized papers also suffered from size loss. The ToF-SIMS results showed no signal for active, nonbonded ASA and instead clear signals were observed for hydrolyzed ASA and for calcium and aluminium. As in the papers wrapped in aluminium foil, ASA was mainly in its hydrolyzed form. Although to a markedly lower extent, the reason for sizing loss in the case of ASA was the same as for AKD.

  • 20826.
    Seppänen, R
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, YKI – Ytkemiska institutet.
    Ström, G
    Elftonson, J
    Heteroflocculation of kaolin pre-treated with oppositely charged polyelectrolytes2000In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, ISSN 0927-7757, E-ISSN 1873-4359, Vol. 164, p. 131-141Article in journal (Refereed)
    Abstract [en]

    Heteroflocculation studies of kaolin particles have been carried out by mixing two kaolin suspensions; one stabilised by a cationic polymer and the other stabilised by a highly charged and low molecular weight anionic polymer. Molar mass and charge density of cationic polymer as well as the mixing ratio of oppositely charged suspensions were varied. Floc size and degradation during shearing were investigated by measuring floc size using a light scattering/diffraction method at different flow rates. It was observed that floc size was small when subjected to a low flow rate and decreased with increasing flow rate. Cationic polymers with high molar mass and low charge density produced flocs with high resistance towards floc degradation. Maximum floc size was obtained at a mixing ratio where the flocs became slightly negatively charged. Floc size and degradation were observed to be independent of primary kaolin particle size. Furthermore, floc size increased with increasing ionic strength. Scanning electron micrographs showed flocs with an open structure, which is expected to improve the optical properties of paper when using microflocs as a filler in paper production.

  • 20827.
    Seppänen, R
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, YKI – Ytkemiska institutet.
    Tiberg, F
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, YKI – Ytkemiska institutet.
    Valignat, M-P
    Mechanism of internal sizing by alkyl ketene dimers (AKD). The role of spreading monolayer2000In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 15, p. 452-458Article in journal (Refereed)
  • 20828.
    Seppänen, R
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, YKI – Ytkemiska institutet.
    von Bahr, M
    Tiberg, F
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, YKI – Ytkemiska institutet.
    Zhmud, B
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, YKI – Ytkemiska institutet.
    Surface energy characterization of AKD-sized papers2004In: Journal of Pulp and Paper Science (JPPS), ISSN 0826-6220, Vol. 30, p. 70-73Article in journal (Refereed)
    Abstract [en]

    Experimental papers with varying alkylketene dimer load were prepared and characterized with respect to size retention, reaction and hydrolysis. The characterization was done by using extraction studies, in combination with X-ray photoelectron spectroscopy and gas chromatography. The surface energy of the produced papers was evaluated using the Good–Oss method. It was shown that by stepping up size additions, both the polar and van der Waals components of the surface energy are reduced.

  • 20829.
    Seppänen, Rauni
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, YKI – Ytkemiska institutet.
    Characterization of AKD-Sized Pilot Papers by XPS and Dynamic Contact Angle Measurements: Chapter 52009In: Characterization of Lignocellulosic Materials / [ed] Thomas Q. Hu, Blackwell Publishing, 2009, p. 81-100Chapter in book (Refereed)
    Abstract [en]

    Alkyl ketene dimer (AKD)-sized pilot papers with varying doses of AKD were prepared and the influence of AKD on the surface chemical composition was investigated by x-ray photoelectron spectroscopy (XPS). In addition, the chemical nature of the papers was evaluated in a dynamic wetting study using two test liquids with different surface tensions. The papers were made of bleached elemental chlorine-free (ECF) pulp, unfilled and filled with 20% high opacity scalenohedral precipitated calcium carbonate (PCC), respectively. The results showed that with increasing AKD addition a higher amount of aliphatic carbon C1 originating from AKD was present on the paper surface. The C1 concentration was significantly lower on the PCC-filled paper surfaces mainly because of the higher specific surface area of the filler. The background evaluation of the XPS oxygen signal suggested that there was a thin overlayer film of AKD on the unfilled paper surface only at a high AKD addition level. The wettability of the sized papers was observed to be greatly dependent on the sizing degree of the papers and the surface tension of the liquid. The contact angles of ethylene glycol, which has a lower surface tension than water, showed more clear and stepwise increase with the increase of AKD on the paper surfaces than those of water. On the other hand, contact angles of water above 90? were reached at a lowAKDcoverage. The PCC-filled paperswetted more rapidly than the corresponding unfilled ones, although the total amount of AKD in the papers was the same.

  • 20830. Serafini, Marco
    et al.
    Bokor, Péter
    Suri, Neeraj
    Vinter, Jonny
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Elektronik, Pålitliga system.
    Ademaj, Astrit
    Brandstätter, Wolfgang
    Tagliabò, Fulvio
    Koch, Jens
    Application-Level Diagnostic and Membership Protocols for Generic Time-Trigged Systems.2011In: IEEE transactions on dependable and secure computing, Vol. 8, no 2, p. 177-193Article in journal (Refereed)
  • 20831.
    Seravalli, Anna
    et al.
    Malmö University, Sweden.
    Upadhyaya, Savita
    VA Syd, Sweden.
    Ernits, Heiti
    RISE Research Institutes of Sweden, Built Environment, System Transition and Service Innovation.
    Design in the public sector: Nurturing reflexivity and learning2022In: The Design Journal, ISSN 1460-6925, E-ISSN 1756-3062, Vol. 25, no 2, p. 225-242Article in journal (Refereed)
    Abstract [en]

    It has been highlighted how design engagement with the public sector risks being either irrelevant or instrumental to technocratic agendas due to a lack of understanding of the public sector’s nature. Based on the idea of public sector innovation as a matter of learning and adaptation for continuous improvement, this article looks at how participatory design approaches can be used to drive co-learning processes within the public sector, namely, collaborative learning processes about institutional aspects. It reflects on the authors’ engagement within a Swedish public organisation that relied on traditional design processes and co-learning processes. By analysing these processes, the article highlights how design as problem framing, by supporting collaborative reflexivity, can be a fruitful way to engage with institutional aspect. © 2022 The Author(s). 

  • 20832.
    Sergeyev, S
    RISE, Swedish ICT, Acreo.
    Model of high-concentration erbium-doped fibre amplifier: effects of migration upconversion processes2003In: Electronics Letters, ISSN 0013-5194, E-ISSN 1350-911X, Vol. 39, no 6, p. 511-12Article in journal (Refereed)
  • 20833.
    Sergeyev, S
    RISE, Swedish ICT, Acreo.
    Modelling of high-concentration erbium doped fiber amplifiers: effects of migration and upconversion processes2003In: Proceedings of CLEO 2003, Conference on lasers and electro optics, Paper CMK2, Baltimore, MD, USA, June 2003. 6 June 2003, 2003Conference paper (Refereed)
    Abstract [en]

    We present a statistical model for studying migration assisted upconversion processes in high-concentration erbium-doped fiber amplifiers. Obtained theoretical results agree experimental data for a small signal gain at 1530 nm.

  • 20834.
    Sergeyev, S
    et al.
    RISE, Swedish ICT, Acreo.
    Jaskorzynska, B
    Statistical model for energy-transfer-induced up-conversion in Er3+-doped glasses2000In: Physical Review B, Vol. 62, p. 15628-Article in journal (Refereed)
  • 20835.
    Sergeyev, S
    et al.
    RISE, Swedish ICT, Acreo.
    Khoptyar, D
    Jaskorzynska, B
    Upconversion migration in erbium-doped waveguides in the continuous-wave excitation switch-off regime2002In: Physical Review B, Vol. 65, p. 2331-Article in journal (Refereed)
  • 20836. Sergeyev, S V
    et al.
    Vanin, E V
    RISE, Swedish ICT, Acreo.
    Popov, S
    Suppression of dynamic instabilities in erbium-doped fiber amplifiers with a combined gain control system2002In: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 27, p. 1117-19Article in journal (Refereed)
  • 20837.
    Sergeyev, Sergey V.
    et al.
    Aston University, United Kingdom.
    Jacobsen, Gunnar
    RISE, Swedish ICT, Acreo.
    Popov, Sergei Yu
    KTH Royal Institute of Technology, Sweden.
    Turitsyn, Sergey K.
    Aston University, United Kingdom.
    Dissipative vector solitons with fast evolving states of polarization2014In: Nonlinear Photonics, NP, 2014Conference paper (Refereed)
    Abstract [en]

    We report on a new vector model of an erbium doped fiber laser mode locked with carbon nanotubes. This model goes beyond the limitations of the previously used models based on either coupled nonlinear Schrödinger or Ginzburg-Landau equations. It results in a new family of vector solitons with fast evolving states of polarization experimentally observed in our previous papers.

  • 20838.
    Sergeyev, Sergey V.
    et al.
    Aston University, UK.
    Kolpakov, Stanislav A.
    Aston University, UK.
    Mou, Ch
    Aston University, UK.
    Jacobsen, Gunnar
    RISE, Swedish ICT, Acreo.
    Popov, Sergei
    KTH Royal Institute of Technology, Sweden.
    Kalashnikov, Vladimir
    Aston University, UK.
    Slow deterministic vector rogue waves2016In: Proceedings of SPIE: Real-time Measurements, Rogue Events, and Emerging Applications, 2016, Vol. 9732, article id 97320KConference paper (Refereed)
    Abstract [en]

    For an erbium-doped fiber laser mode-locked by carbon nanotubes, we demonstrate experimentally and theoretically a new type of the vector rogue waves emerging as a result of the chaotic evolution of the trajectories between two orthogonal states of polarization on the Poincare sphere. In terms of fluctuation induced phenomena, by tuning polarization controller for the pump wave and in-cavity polarization controller, we are able to control the Kramers time, i.e. the residence time of the trajectory in vicinity of each orthogonal state of polarization, and so can cause the rare events satisfying rogue wave criteria and having the form of transitions from the state with the long residence time to the state with a short residence time.

  • 20839.
    Sergeyev, Sergey V.
    et al.
    Aston University, United Kingdom.
    Mou, Chengbo
    Aston University, United Kingdom.
    Habruseva, Tatiana
    Aston University, United Kingdom.
    Tsatourian, Veronika
    Aston University, United Kingdom.
    Jacobsen, Gunnar
    RISE, Swedish ICT, Acreo.
    Popov, Sergei Yu
    RISE, Swedish ICT, Acreo.
    Turitsyn, Sergey K.
    Aston University, United Kingdom.
    Vector solitons in mode locked fibre lasers2014In: International Conference on Transparent Optical Networks, 2014, article id 6876668Conference paper (Refereed)
    Abstract [en]

    We overview our recent results on polarisation dynamics of vector solitons in erbium doped fibre laser mode locked with carbon nanotubes. Our experimental and theoretical study revealed new families of vector solitons for fundamental and bound-state soliton operations. The observed scenario of the evolution of the states of polarisation (SOPs) on the Poincare sphere includes fast polarisation switching between two and three SOPs along with slow SOP evolution on a double scroll chaotic attractor. The underlying physics presents an interplay between effects of birefringence of the laser cavity and light induced anisotropy caused by polarisation hole burning.

  • 20840.
    Sergeyev, SV
    RISE, Swedish ICT, Acreo.
    Interplay of an Anisotropy and Orientational Relaxation Processes in Luminescence and Lasing of Dyes2001In: Handbook of Advanced Electronic and Photonic Materials and Devices. Vol. 7, 2001, p. 247-276Chapter in book (Other academic)
  • 20841.
    Serrano, Erik
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    A numerical study of the shear-strength-predicting capabilities of test specimens for wood–adhesive bonds2004In: International Journal of Adhesion and Adhesives, ISSN 0143-7496, E-ISSN 1879-0127, Vol. 24, no 1, p. 23-35Article in journal (Refereed)
  • 20842.
    Serrano, Erik
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, AB Trätek.
    A numerical study of the shear-strength-predicting capabilities of test specimens for wood-adhesive bonds2004In: International Journal of Adhesion and Adhesives, Vol. 24, p. 23-35Article in journal (Refereed)
  • 20843.
    Serrano, Erik
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    An overwiew of failures in large-span timber structures2006Report (Refereed)
    Abstract [sv]

    A total of 18 failures (collapse, crack formation, excessive deformation etc) in Swedish timber structures from the period 1978 - 2005 were reviewed. The most common reasons for failure was found to be the lack of design or poor design in relation to mechanical loading, which was the primary cause of failure for nine of the cases. In these cases the presence of notches and holes, at which the high stresses perpendicular to grain develop, was often the main cause of failure. In six of the eighteen cases it was concluded that the failure was caused by errors done in the manufacturing of the product (mainly glulam). Examples of this category include, for example, gluing errors (lack of hardener, poor gluing pressure etc.) The main conclusion from the investigation is that in none of the cases was the wood raw material the cause for failure. Instead, all failures were either due to the lack of knowledge (lack of design knowledge, lack of knowledge about sound production methods) or due to poor quality control procedures. Key words: timber structure, failure, collapse, glulam, glued laminated timber, wood, wood products

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  • 20844.
    Serrano, Erik
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Beröringsfri deformationsmätning – avancerad mätning för detaljerad analys2006Report (Refereed)
    Abstract [sv]

    Moderna datorbaserade beräkningsmetoder har använts sedan länge inom bl a fordonsindustrin som ett hjälpmedel vid produktframtagning. På senare år har sådana metoder, framför allt finita elementmetoden, FEM, också kommit att användas av andra branscher. Vid all virtuell produktframtagning uppkommer så småningom ett behov av verifiering av faktiska egenskaper som exempelvis hållfasthet och stabilitet via provning. Beroende på produktens komplexitet och provningsförhållanden i övrigt kan det ibland vara svårt, eller till och med omöjligt, att vid sådana mekaniska provningar genomföra deformationsmätning på traditionellt vis, med trådtöjningsgivare eller deformationsgivare. Denna Kontenta behandlar kortfattat en relativt ny teknik för mätning av deformationer vid provning, baserad på beröringsfri mätning med kamerateknik.

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  • 20845.
    Serrano, Erik
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP – Sveriges Provnings- och Forskningsinstitut.
    Documentation of the Limnologen Project: Overview and Summaries of Sub Projects Results2009Report (Refereed)
  • 20846.
    Serrano, Erik
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP – Sveriges Provnings- och Forskningsinstitut.
    Uppföljnings- och dokumentationsprojektet Limnologen: Översikt och delprojektrapporter i sammanfattning2009Report (Refereed)
  • 20847. Serrano, Erik
    et al.
    Blixt, Johan
    Enquist, Bertil
    Källsner, Bo
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Oscarsson, Jan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Petersson, Hans
    Sterley, Magdalena
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Wet glued laminated beams using side boards of Norway spruce2011Report (Refereed)
  • 20848.
    Serrano, Erik
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Blumer, Samuel
    Gustafsson, P.J.
    Niemz, Peter
    Moisture induced stresses and deformations in parquet floors: An experimental and numerical study2007In: Wood Structure and Properties ’06, Arbora , 2007, , p. 481-484Conference paper (Refereed)
  • 20849.
    Serrano, Erik
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä. Linnaeus University, Sweden; Lund University, Sweden.
    Enquist, B.
    Linnaeus University, Sweden.
    Vessby, J.
    Linnaeus University, Sweden.
    Long term in-situ measurements of displacement, temperature and relative humidity in a multi-storey residential CLT building2014Conference paper (Refereed)
    Abstract [en]

    In a multi-storey residential housing project comprising of four 8-storey timber buildings, the bottom storey being designed with concrete and storeys 2-8 in timber, the vertical relative displacement, the temperature and the relative humidity (RH) have been monitored. Displacement measurements started during construction and presented herein are results of 6.5 years of in-situ measurements. Temperature and relative humidity measurements have been ongoing for about 5.5 years. The temperature and RH measurements were performed at six different locations in the building, at each location in eight positions through the exterior wall with a sampling frequency of 1 measurement every 15 minutes. The results show that the total vertical displacement over six storeys after 6.5 years of service life is approximately 23 mm as a yearly average, and over the year the displacement varies from this value by approximately ±2 mm. The main cause for the relative displacement is the decrease of moisture content in the wood material leading to shrinkage after completion of the building. The results obtained show also that the exterior wall design of the building behaves well in terms of not comprising a general risk for damp or mould in the timber core of the external walls.

  • 20850.
    Serrano, Erik
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Enquist, Bertil
    Compression strength perpendicular to grain in cross-laminated timber (CLT)2010In: Proceedings of World Conference on Timber Engineering - WCTE 2010, World Conference on Timber Engineering , 2010, , p. 8Conference paper (Refereed)
414415416417418419420 20801 - 20850 of 26180
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