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  • 151.
    Carlson, Rolf
    et al.
    KTH, Superseded Departments (pre-2005), Speech, Music and Hearing.
    Friberg, Anders
    KTH, Superseded Departments (pre-2005), Speech, Music and Hearing.
    Frydén, Lars
    KTH, Superseded Departments (pre-2005), Speech, Music and Hearing.
    Granström, Björn
    KTH, Superseded Departments (pre-2005), Speech, Music and Hearing.
    Sundberg, Johan
    KTH, Superseded Departments (pre-2005), Speech, Music and Hearing.
    Speech and music performance. Parallels and contrasts1987In: STL-QPSR, Vol. 28, no 4, p. 007-023Article in journal (Other academic)
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  • 152.
    Carlson, Rolf
    et al.
    KTH, Superseded Departments (pre-2005), Speech, Music and Hearing.
    Friberg, Anders
    KTH, Superseded Departments (pre-2005), Speech, Music and Hearing.
    Frydén, Lars
    KTH, Superseded Departments (pre-2005), Speech, Music and Hearing.
    Granström, Björn
    KTH, Superseded Departments (pre-2005), Speech, Music and Hearing.
    Sundberg, Johan
    KTH, Superseded Departments (pre-2005), Speech, Music and Hearing.
    Speech and music performance: parallels and contrasts1989In: Contemporary Music Review, ISSN 0749-4467, E-ISSN 1477-2256, Vol. 4, p. 389-402Article in journal (Refereed)
    Abstract [en]

    Speech and music performance are two important systems for interhuman communication by means of acoustic signals. These signals must be adapted to the human perceptual and cognitive systems. Hence a comparitive analysis of speech and music performances is likely to shed light on these systems, particularly regarding basic requirements for acoustic communication. Two computer programs are compared, one for text-to-speech conversion and one for note-to-tone conversion. Similarities are found in the need for placing emphasis on unexpected elements, for increasing the dissimilarities between different categories, and for flagging structural constituents. Similarities are also found in the code chosen for conveying this information, e.g. emphasis by lengthening and constituent marking by final lengthening. 

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  • 153.
    Carlsson, F
    et al.
    KTH. RaySearch Laboratories AB, Stockholm, Sweden.
    Forsgren, Anders
    KTH, Superseded Departments (pre-2005), Mathematics.
    Iterative regularization of the IMRT optimization problem2005In: Medical physics (Lancaster), ISSN 0094-2405, Vol. 32, no 6, p. 2140-2140Article in journal (Other academic)
  • 154. Carlsson, F
    et al.
    Rehbinder, H
    Forsgren, Anders
    KTH, Superseded Departments (pre-2005), Mathematics.
    Lof, J
    On the use of curvature information in IMRT optimization2004In: Medical physics (Lancaster), ISSN 0094-2405, Vol. 31, no 6, p. 1906-1906Article in journal (Other academic)
  • 155. Carlsson, L A
    et al.
    Lindstrom, T
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
    A shear-lag approach to the tensile strength of paper (vol 65, pg 183, 2005)2005In: Composites Science And Technology, ISSN 0266-3538, E-ISSN 1879-1050, Vol. 65, no 7-8, p. 1321-1321Article in journal (Refereed)
  • 156.
    Carlsson, Torgny E.
    et al.
    KTH.
    Gustafsson, Jonny
    Nilsson, Bengt J. L.
    KTH.
    Development of a 3D camera1999In: Proceedings of SPIE: Practical Holography XIII / [ed] Stephen A. Benton, 1999, Vol. 3637, p. 218-224Conference paper (Refereed)
    Abstract [en]

    In the development of new products there are two parallel lines for the development process to follow; the traditional or 'real,' and the new computer aided or 'virtual.' The traditional line is to develop prototypes that can be used for testing strength, functionality, and visual appearance of the product. In the virtual line digital (CAD) models are developed which can be tested entirely in a computer by simulations e.g., using Finite Element Analysis (FEA) and other tools. For transformation from the real to the virtual world some kind of 3D camera is needed. The shape of the model should be measured together with further data concerning the visual appearance, material properties, etc. We have developed electronic recording techniques for doing this based on the Light-in-Flight technique. This technology has all advantages of holography, i.e., apart from the shape it is also possible to measure how much light is reflected from different parts of the object along with interferometric information, which can give mechanical data for the object. This can be used for example for visualization and to give tactile and haptic information to a virtual reality system about how the object would be perceived by a person touching it.

  • 157.
    Carlsson, Torgny E.
    et al.
    KTH, Superseded Departments (pre-2005), Production Engineering.
    Nilsson, Bengt
    KTH, School of Industrial Engineering and Management (ITM), Production engineering.
    Gustafsson, Jonny
    KTH, School of Industrial Engineering and Management (ITM), Production engineering.
    System for acquisition of three-dimensional shape and movement using digital Light-in-Flight holography2001In: Optical Engineering: The Journal of SPIE, ISSN 0091-3286, E-ISSN 1560-2303, Vol. 40, no 1, p. 67-75Article in journal (Refereed)
    Abstract [en]

    In the development of new products there are two parallel lines for the development process to follow: the traditional or "real" and the new computer aided or "virtual." The traditional line is to develop prototypes that can be used for testing strength, functionality, and visual appearance of the product. In the virtual line digital (CAD) models are developed that can be tested entirely in a computer by simulations, e.g., using finite element analysis (FEA) and other tools. For transformation from the real to the virtual world some kind of 3-D acquisition system is needed. The shape of the model should be measured together with further data concerning the visual appearance, material properties, etc. We develop electronic recording techniques for doing this based on the Light-in-Flight technique. This technology has all the advantages of holography, i.e., apart from the shape it is also possible to measure how much light is reflected from different parts of the object along with interferometric information, which can give mechanical data for the object. This can be used, for example, for visualization and to give tactile and haptic information to a virtual reality system about how the object would be perceived by a person touching it.

  • 158.
    Carlsson, Torgny
    et al.
    KTH.
    Nilsson, Bruno
    KTH.
    Gustafsson, Jonny
    KTH, School of Industrial Engineering and Management (ITM), Production engineering. Holovision AB (Sweden).
    Abramson, Nils H.
    KTH.
    Practical system for time-resolved holographic interferometry1991In: Optical Engineering: The Journal of SPIE, ISSN 0091-3286, E-ISSN 1560-2303, Vol. 30, no 7, p. 1017-1022Article in journal (Refereed)
    Abstract [en]

    An easily implemented and easily manageable system for time-resolved holographic interferometry is presented. The system consists of a multiple-pulsed Q-switched ruby laser and a rotating disk having radial slits with a constant angular separation. The disk is used to scan the reference beam along a holographic plate, thereby achieving spatial multiplexing. Since the influence on the beam is negligible and a single slit is illuminated by every laser pulse, there is no need for synchronization. The interferometric pattern is achieved by removing the disk and exposing a reference image on the holographic plate. The system may serve as an excellent tool for full-field dynamic measurements. A simple experiment has beem performed showing a sequence of momentary interference patterns on a vibrating plate.

  • 159.
    Castro-Lopez, R.
    et al.
    CSIC, IMSE CNM, E-41080 Seville, Spain..
    de Llera, D. Rodriguez
    KTH, School of Information and Communication Technology (ICT).
    Ismail, M.
    KTH, School of Information and Communication Technology (ICT). Ohio State Univ, Analog VLSI Lab, Columbus, OH 43210 USA..
    Fernandez, F. V.
    CSIC, IMSE CNM, E-41080 Seville, Spain.;Univ Seville, Seville, Spain..
    AMS/RF-CMOS circuit design for wireless transceivers2009In: Integration, ISSN 0167-9260, E-ISSN 1872-7522, Vol. 42, no 1, p. 1-2Article in journal (Refereed)
  • 160. Cataldi, Gianni
    et al.
    Brandeker, Alexis
    Thebault, Philippe
    Singer, Kelsi
    Ahmed, Engy
    KTH, Centres, Science for Life Laboratory, SciLifeLab. Stockholm University, Sweden.
    de Vries, Bernard L.
    Neubeck, Anna
    Olofsson, Goeran
    Searching for Biosignatures in Exoplanetary Impact Ejecta2017In: Astrobiology, ISSN 1531-1074, E-ISSN 1557-8070, Vol. 17, no 8, p. 721-746Article in journal (Refereed)
    Abstract [en]

    With the number of confirmed rocky exoplanets increasing steadily, their characterization and the search for exoplanetary biospheres are becoming increasingly urgent issues in astrobiology. To date, most efforts have concentrated on the study of exoplanetary atmospheres. Instead, we aim to investigate the possibility of characterizing an exoplanet (in terms of habitability, geology, presence of life, etc.) by studying material ejected from the surface during an impact event. For a number of impact scenarios, we estimate the escaping mass and assess its subsequent collisional evolution in a circumstellar orbit, assuming a Sun-like host star. We calculate the fractional luminosity of the dust as a function of time after the impact event and study its detectability with current and future instrumentation. We consider the possibility to constrain the dust composition, giving information on the geology or the presence of a biosphere. As examples, we investigate whether calcite, silica, or ejected microorganisms could be detected. For a 20km diameter impactor, we find that the dust mass escaping the exoplanet is roughly comparable to the zodiacal dust, depending on the exoplanet's size. The collisional evolution is best modeled by considering two independent dust populations, a spalled population consisting of nonmelted ejecta evolving on timescales of millions of years, and dust recondensed from melt or vapor evolving on much shorter timescales. While the presence of dust can potentially be inferred with current telescopes, studying its composition requires advanced instrumentation not yet available. The direct detection of biological matter turns out to be extremely challenging. Despite considerable difficulties (small dust masses, noise such as exozodiacal dust, etc.), studying dusty material ejected from an exoplanetary surface might become an interesting complement to atmospheric studies in the future.

  • 161.
    Ceccato, Vania
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Urban Planning and Environment, Urban and Regional Studies. Säkraplatser Nätverket.
    Hansson, Magnus
    KTH, School of Architecture and the Built Environment (ABE).
    Experiences from Assessing Safety in Vingis Park, Vilnius, Lithuania2013In: Review of European Studies, ISSN 1918-7173, E-ISSN 1918-7181, Vol. 5, no 5Article in journal (Refereed)
    Abstract [en]

    The aim of this article is to suggest a multi-method approach for assessing safety in parks. The study is based on the analysis of police crime data combined with information from a safety walk and safety survey of park users. The framework is tested in an urban park, Vingis, in the inner city of Vilnius, the capital of Lithuania. Findings show that Vingis is perceived as a safe park, but, compared with police statistics, the survey and the safety walk provide a more nuanced diagnostic of safety in this green area. Vingis’ safety is compromised by car traffic and illicit parking practices, the park’s poor capacity to accommodate users’ needs (e.g. the elderly, parents with small children, young people) and the inadequate infrastructure for users at certain times, such as in the evenings and dark months of the year. Patterns of safety expressed by citizens of Vingis park do not differ from the ones found in parks elsewhere (both in relation to their physical and social environment), despite the recent transformations Vilnius, as the capital city, has overcome since the country’s independence. The article concludes with an assessment of the proposed framework and directions for research and intervention.

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  • 162.
    Cederwall, Bo
    et al.
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Doncel, M.
    Univ Liverpool, Oliver Lodge Lab, Dept Phys, Liverpool L69 7ZE, Merseyside, England..
    Aktas, Özge
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Ertoprak, Aysegul
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Liotta, Roberto
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Qi, Chong
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Grahn, T.
    Univ Jyvaskyla, Epartment Phys, POB 35, FI-40014 Jyvaskyla, Finland..
    Cullen, D. M.
    Univ Manchester, Sch Phys & Astron, Schuster Bldg, Manchester M13 9PL, Lancs, England..
    Hodge, D.
    Univ Manchester, Sch Phys & Astron, Schuster Bldg, Manchester M13 9PL, Lancs, England..
    Giles, M.
    Univ Manchester, Sch Phys & Astron, Schuster Bldg, Manchester M13 9PL, Lancs, England..
    Stolze, S.
    Univ Jyvaskyla, Epartment Phys, POB 35, FI-40014 Jyvaskyla, Finland..
    Badran, H.
    Univ Jyvaskyla, Epartment Phys, POB 35, FI-40014 Jyvaskyla, Finland..
    Braunroth, T.
    Univ Cologne, Inst Kernphys, D-50937 Cologne, Germany..
    Calverley, T.
    Univ Jyvaskyla, Epartment Phys, POB 35, FI-40014 Jyvaskyla, Finland..
    Cox, D. M.
    Univ Jyvaskyla, Epartment Phys, POB 35, FI-40014 Jyvaskyla, Finland.;Lund Univ, Dept Phys, S-22100 Lund, Sweden..
    Fang, Y. D.
    Osaka Univ, Res Ctr Nucl Phys, JP-5670047 Osaka, Japan..
    Greenlees, P. T.
    Univ Jyvaskyla, Epartment Phys, POB 35, FI-40014 Jyvaskyla, Finland..
    Hilton, J.
    Univ Jyvaskyla, Epartment Phys, POB 35, FI-40014 Jyvaskyla, Finland..
    Ideguchi, E.
    Osaka Univ, Res Ctr Nucl Phys, JP-5670047 Osaka, Japan..
    Julin, R.
    Univ Jyvaskyla, Epartment Phys, POB 35, FI-40014 Jyvaskyla, Finland..
    Juutinen, S.
    Univ Jyvaskyla, Epartment Phys, POB 35, FI-40014 Jyvaskyla, Finland..
    Raju, M. Kumar
    Osaka Univ, Res Ctr Nucl Phys, JP-5670047 Osaka, Japan..
    Li, H.
    CEA, GANIL, DSMa, CNRS,IN2P3, F-14076 Caen 5, France..
    Liu, H.
    KTH.
    Matta, Sanya
    KTH, School of Engineering Sciences (SCI), Physics.
    Modamio, V.
    Univ Oslo, Dept Phys, NO-0316 Oslo, Norway..
    Pakarinen, J.
    Univ Jyvaskyla, Epartment Phys, POB 35, FI-40014 Jyvaskyla, Finland..
    Papadakis, P.
    Univ Liverpool, Oliver Lodge Lab, Dept Phys, Liverpool L69 7ZE, Merseyside, England.;Univ Jyvaskyla, Epartment Phys, POB 35, FI-40014 Jyvaskyla, Finland..
    Partanen, J.
    Univ Jyvaskyla, Epartment Phys, POB 35, FI-40014 Jyvaskyla, Finland..
    Petrache, C. M.
    Univ Paris Saclay, Ctr Sci Nucl & Sci Mat, CNRS, IN2P3, F-91405 Orsay, France..
    Rahkila, P.
    Univ Jyvaskyla, Epartment Phys, POB 35, FI-40014 Jyvaskyla, Finland..
    Ruotsalainen, P.
    Univ Jyvaskyla, Epartment Phys, POB 35, FI-40014 Jyvaskyla, Finland..
    Sandzelius, M.
    Univ Jyvaskyla, Epartment Phys, POB 35, FI-40014 Jyvaskyla, Finland..
    Saren, J.
    Univ Jyvaskyla, Epartment Phys, POB 35, FI-40014 Jyvaskyla, Finland..
    Scholey, C.
    Univ Jyvaskyla, Epartment Phys, POB 35, FI-40014 Jyvaskyla, Finland..
    Sorri, J.
    Univ Jyvaskyla, Epartment Phys, POB 35, FI-40014 Jyvaskyla, Finland.;Ist Nazl Fis Nucl, Lab Nazl Legnaro, I-35020 Legnaro, Italy.;Sodankyla Geophys Observ, FI-99600 Sodankyla, Finland..
    Subramaniam, Pranav
    KTH.
    Taylor, M. J.
    Univ Manchester, Sch Med Sci, Div Canc Sci, Manchester M13 9PL, Lancs, England..
    Uusitalo, J.
    Univ Jyvaskyla, Epartment Phys, POB 35, FI-40014 Jyvaskyla, Finland..
    Valiente-Dobon, J. J.
    Ist Nazl Fis Nucl, Lab Nazl Legnaro, I-35020 Legnaro, Italy..
    Lifetime Measurements of Excited States in Pt-172 and the Variation of Quadrupole Transition Strength with Angular Momentum2018In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 121, no 2, article id 022502Article in journal (Refereed)
    Abstract [en]

    Lifetimes of the first excited 2(+) and 4(+) states in the extremely neutron -deficient nuclide Pt-172 have been measured for the first time using the recoil-distance Doppler shift and recoil-decay tagging techniques. An unusually low value of the ratio B(E2: 4(1)(+) -> 2(1)(+)/B(E2: 2(1)(+) -> 0(gs)(+)) = 0.55(19) was found, similar to a handful of other such anomalous cases observed in the entire Segre chart. The observation adds to a cluster of a few extremely neutron -deficient nuclides of the heavy transition metals with neutron numbers N approximate to 90-94 featuring the effect. No theoretical model calculations reported to date have been able to explain the anomalously low B(E2: 4(1)(+) -> 2(1)(+)/B(E2: 2(1)(+) -> 0(gs)(+)) ratios observed in these cases. Such low values cannot, e.g., be explained within the framework of the geometrical collective model or by algebraic approaches within the interacting boson model framework. It is proposed that the group of B(E2: 4(1)(+) -> 2(1)(+)/B(E2: 2(1)(+) -> 0(gs)(+)) ratios in the extremely neutron-deficient even-even W, Os, and Pt nuclei around neutron numbers N approximate to 90-94 reveal a quantum phase transition from a seniority-conserving structure to a collective regime as a function of neutron number. Although a system governed by seniority symmetry is the only theoretical framework for which such an effect may naturally occur, the phenomenon is highly unexpected for these nuclei that are not situated near closed shells.

  • 163.
    Chang, Tingru
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Surface and Corrosion Science. AIMES - Center for the Advancement of Integrated Medical and Engineering Sciences at Karolinska Institutet and KTH Royal Institute of Technology, Stockholm, Sweden; Department of Neuroscience, Karolinska Institutet, Stockholm, SE-171 77, Sweden.
    Butina, Karen
    Karolinska Inst, AIMES Ctr Adv Integrated Med & Engn Sci, Stockholm, Sweden.;KTH Royal Inst Technol, Stockholm, Sweden.;Karolinska Inst, Dept Neurosci, SE-17177 Stockholm, Sweden..
    Herting, Gunilla
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Surface and Corrosion Science.
    Rajarao, Gunaratna Kuttuva
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Industrial Biotechnology.
    Richter-Dahlfors, Agneta
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology. Karolinska Inst, AIMES Ctr Adv Integrated Med & Engn Sci, Stockholm, Sweden; Karolinska Inst, Dept Neurosci, SE-17177 Stockholm, Sweden.
    Blomberg, Eva
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Surface and Corrosion Science.
    Odnevall Wallinder, Inger
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Surface and Corrosion Science. Karolinska Inst, AIMES Ctr Adv Integrated Med & Engn Sci, Stockholm, Sweden.;KTH Royal Inst Technol, Stockholm, Sweden.;Karolinska Inst, Dept Neurosci, SE-17177 Stockholm, Sweden..
    Leygraf, Christofer
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Surface and Corrosion Science.
    The interplay between atmospheric corrosion and antimicrobial efficiency of Cu and Cu5Zn5Al1Sn during simulated high-touch conditions2021In: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 185, article id 109433Article in journal (Refereed)
    Abstract [en]

    The interplay between atmospheric corrosion and antimicrobial efficiency of bare Cu and Cu5Zn5Al1Sn was studied upon exposures simulating high-touch surface conditions. The survival of the bacteria Bacillus subtilis during surface contact with Cu and Cu5Zn5Al1Sn was examined under different degrees of surface oxidation, tarnishing, wettability and copper ion release. Depending on surface conditions complete bacteria inhibition was obtained within 4 min on Cu and within 6-10 min on Cu5Zn5Al1Sn. The antibacterial efficiency increases slightly with copper release rate and is governed by complex interactions between the corroded metal surface, bacteria and extracellular polymeric substances produced by the bacteria.

  • 164.
    Chatrchyan, Aleksandr
    et al.
    Nordita SU.
    Eröncel, Cem
    Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany, Notkestr. 85; Istanbul Technical University, Department of Physics, 34469 Maslak, Istanbul, Turkey, Maslak.
    Koschnitzke, Matthias
    Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany, Notkestr. 85; II. Institut für Theoretische Physik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany, Luruper Chaussee 149.
    Servant, Géraldine
    Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany, Notkestr. 85; II. Institut für Theoretische Physik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany, Luruper Chaussee 149.
    Gravitational signatures of ALP dark matter fragmentation2024In: European Physical Society Conference on High Energy Physics, EPS-HEP 2023, Sissa Medialab Srl , 2024, article id 116Conference paper (Refereed)
    Abstract [en]

    The misalignment mechanism for axion-like particles (ALPs) is a leading explanation for dark matter. In this work we investigate ALPs with non-periodic potentials, which allow for large misalignment of the field from the minimum and make it possible for ALPs to match the relic density of dark matter in a large part of the parameter space. Such potentials give rise to self-interactions which can trigger an exponential growth of fluctuations in the ALP field via parametric resonance, leading to the fragmentation of the field. The fluctuations later collapse to halos that can be dense enough to produce observable gravitational effects. These effects would provide a probe of dark matter even if it does not couple to the Standard Model (or too feebly). We determine the relevant regions of parameter space in the (ALP mass, decay constant)-plane and compare predictions in different axion fragmentation models. These proceedings are a short version of [1].

  • 165.
    Chattopadhyaya, Mausumi
    et al.
    KTH, School of Biotechnology (BIO), Theoretical Chemistry and Biology.
    Murugan, N. Arul
    KTH, School of Biotechnology (BIO), Theoretical Chemistry and Biology.
    Rinkevicius, Zilvinas
    KTH, School of Biotechnology (BIO), Theoretical Chemistry and Biology. KTH, Centres, SeRC - Swedish e-Science Research Centre.
    Origin of the Absorption Band of Bromophenol Blue in Acidic and Basic pH: Insight from a Combined Molecular Dynamics and TD-DFT/MM Study2016In: Journal of Physical Chemistry A, ISSN 1089-5639, E-ISSN 1520-5215, Vol. 120, no 36, p. 7175-7182Article in journal (Refereed)
    Abstract [en]

    We study the linear and nonlinear optical properties of a well-known acid base indicator, bromophenol blue (BPB), in aqueous solution by employing static and integrated approaches. In the static approach, optical properties have been calculated using time-dependent density functional theory (TD-DFT) on the fully relaxed geometries of the neutral and different unprotonated forms of BPB. Moreover, both closed and open forms of BPB were considered. In the integrated approach, the optical properties have been computed over many snapshots extracted from molecular dynamics simulation using a hybrid time-dependent density functional theory/molecular mechanics approach. The static approach suggests closed neutral double right arrow anionic interconversion as the dominant mechanism for the red shift in the absorption spectra of BPB due to a change from acidic to basic pH. It is found by employing an integrated approach that the two interconversions, namely open neutral double right arrow anionic and open neutral double right arrow dianionic, can contribute to the pH- dependent shift in the absorption spectra of BPB. Even though both static and integrated approaches reproduce the pH-dependent red shift in the absorption spectra of BPB, the latter one is suitable to determine both the spectra and spectral broadening. Finally, the computed static first hyperpolarizability for various protonated and deprotonated forms of BPB reveals that this molecule can be used as a nonlinear optical probe for pH sensing in addition to its highly exploited use as an optical probe.

  • 166.
    Chavez, Zuhara
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Sustainable production development.
    Gopalakrishnan, Maheshwaran
    KTH, School of Industrial Engineering and Management (ITM), Sustainable production development.
    Nilsson, Viktor
    KTH, School of Industrial Engineering and Management (ITM), Industrial Economics and Management (Dept.).
    Westbroek, Arvid
    KTH, School of Industrial Engineering and Management (ITM), Industrial Economics and Management (Dept.).
    Exploring Data-Driven Decision-Making for Enhanced Sustainability2022In: Advances in Transdisciplinary Engineering, IOS Press , 2022, p. 392-403Conference paper (Refereed)
    Abstract [en]

    The industry transition towards digital transformation opens the possibilities to utilize data for enhancing sustainability in industrial operations and build capabilities towards resilient and circular operations, i.e., shift towards industry 5.0. This paper explores how data-driven decision-making (DDDM) can enable sustainable and resilient supply chain operations within the manufacturing industry. A series of in-depth interviews were conducted with experts, researchers, and company representatives across the manufacturing industry and universities in Sweden. The findings show a consensus among companies, researchers, and literature about the potential of data utilization for sustainability purposes; however, in most cases, the complete transformation towards data-driven has not happened yet. Companies have uncertainty about what data is needed rather than its lack. Reliability & validity of data become essential to exploit the potential of the data organizations already possess. Based on the literature and interview data, a conceptual model is proposed, including three identified parameters connected to DDDM, 1) data and IT infrastructure, 2) current operations, and 3) an improved triple bottom line performance. The model captures the interconnections between such parameters, depicting the benefits and challenges of DDDM and its relation to more sustainable and resilient supply chain operations within the manufacturing industry. In a data-driven approach, real-time analysis of complex & extensive amounts of data gives unlimited possibilities to improve manufacturing operations through decision-making. 

  • 167.
    Chen, Chen
    et al.
    KTH. China Univ Geosci, Sch Environm Studies, Hubei Key Lab Yangtze Catchment Environm Aquat Sc, Wuhan 430074, Peoples R China.;Minist Nat Resources, Wuhan Geol Survey Ctr, China Geol Survey, Wuhan 430074, Peoples R China..
    Tao, Quanyu
    KTH, School of Electrical Engineering and Computer Science (EECS), Intelligent systems.
    Wen, Zhang
    China Univ Geosci, Sch Environm Studies, Hubei Key Lab Yangtze Catchment Environm Aquat Sc, Wuhan 430074, Peoples R China..
    Wörman, Anders
    KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Resources, Energy and Infrastructure.
    Jakada, Hamza
    Baze Univ, Dept Civil Engn, Abuja, Nigeria..
    Step-drawdown test for identifying aquifer and well loss parameters in a partially penetrating well with irregular (non-linear increasing) pumping rates2022In: Journal of Hydrology, ISSN 0022-1694, E-ISSN 1879-2707, Vol. 614, article id 128652Article in journal (Refereed)
    Abstract [en]

    A step-drawdown test with an increasing pumping rate at each step in a fully penetrating well is a typical procedure for estimating aquifer parameters and well losses. However, partially penetrating wells in closed aquifers have also been adopted mainly due to economic constraints with a stepwise increase in the pumping rate. In this study, a new empirical method is proposed based on the stepwise drawdown defined by irregular pumping rates in a partially penetrating well. The method was validated by fitting drawdown data from classical works. The characteristics of the drawdowns and well losses were discussed for varying pumping scenarios. The results indicate that the new empirical method interprets previous works more accurately for a fully penetrating well and also effectively estimates the aquifer and well loss parameters. A new coefficient, the pumping ratevarying index a, was introduced to indicate the pumping rate difference (Delta Q) between the two steps. As such, a negative pumping rate difference would decrease the well-loss and result in a negative a. In addition, the effect of the ratio of the well's screen length to aquifer thickness demonstrates that a longer screen would cause a larger well loss. Finally, the proposed empirical method was applied to a fieldwork conducted in Xiangyang city, central China, to investigate the aquifer and well loss parameters using the particle swarm optimization (PSO) method.

  • 168.
    Chen, Hongjian
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Medical Imaging.
    Larsson, David
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Medical Imaging.
    Janerot-Sjöberg, Birgitta
    Colarieti-Tosti, Massimiliano
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Medical Imaging.
    Grishenkov, Dmitry
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Medical Imaging.
    Polymer Microbubbles as Dual Modal Contrast Agent for Ultrasound and Computed Tomography2018Conference paper (Refereed)
    Abstract [en]

    The hybrid imaging combines the anatomical information with the functional or metabolic information using different conventional single imaging modalities improving the overall diagnosis outcome of the clinical examination. Since the introduction of the first hybrid imaging device PET-CT in 1998 different combinations of hybrid imaging were developed such as PET-MRI, SPECT-CT.

    However, lack of multimodal contrast agent specifically aimed for hybrid imaging limits the diagnostic outcome of these novel techniques. Initial attempts in fabrication of hybrid contrast agents were made by combining previously existing single modal contrast agents into one. In this study, polyvinyl alcohol (PVA) microbubbles (MB) and gold nanoparticles - which by themselves are already established contrast agents used in preclinical studies for ultrasound and CT, respectively - were chosen as parent contrast agents to fabricate the dual modal Contrast Agent for UltraSound and CT (CACTUS).

    Method

    The fabrication of MBs was adapted from Cavalieri et al.[1]. PVA powder (Sigma Aldrich, MO USA) was dissolved in the water at 80°C. The aqueous PVA-chains were cleaved by sodium metaperiodate (NaIO4, purity>99.0%, Sigma Aldrich, MO USA). Vigorous stirring force was applied to the resulting telechelic aldehydic PVA-chains for 2 hours to crosslink the telechelic aldehydic PVA-chains and form the PVA-coated MBs at the water-air interface.

    CACTUS MBs were synthesized in a similar fashion to the above, but adding gold nanoparticles (diameter 1.9nm, Nanoprobes, NY, USA) during formation of the MBs.

    The size distributions of MBs and CACATUS MBs were determined using an optical microscope (ECLIPSE Ci-S, Nikon, Tokyo, Japan) and a Neubauer counting chamber (Brand GmbH, Wertheim, Germany).

    The acoustic attenuation coefficients of the MBs suspension were acquired at peak negative pressure (PNP) from 10 - 300 kPa. Three MBs suspension samples with concentrations of (sample A),  (sample B) and  ml-1 (sample C) were prepared and loaded in a 1 cm thick two-cavity chamber. A flat single crystal ultrasound transducer with central frequency 3.5MHz was used to generate the ultrasound beam. The amplitude of received echoes through samples and water were compared at the fundamental frequency, as well as the 2nd and 3rd harmonic for each value of the concentration used.

    The mass attenuation of water, suspension of gold nanoparticles with concentration 160mg/L, plain MBs, and CACTUS MBs, was measured by quantum FX-CT micro-CT (PerkinElmer Inc, MA, USA). The micro-CT was operated at a current of 200mA with exposure time of 120s and varied voltage 50kV, 70kV and 90kV. Each 3D image has a size of 512*512*512 pixels or 75.8*75.8*75.8 mm. Contrast to noise ratios (CNR) between water and all samples were calculated following Eq. 1.Where S(x,y,z) and W(x,y,z) are the mass attenuation of the sample and water per voxel, respectively. ns(x,y,z) and nw(x,y,z) are the noise function with zero mean of sample and water respectively. Ms and Mw are the mean mass attenuation acquired for the sample and water in the volume of interest. The σs2 and σw2 are the variance of the mass attenuation read out of the sample and water in the volume of interested.

    In addition to the gas-core MBs for the CT tests, liquid-core gold loaded capsules were synthesized in two steps. In the first step, PVA shelled liquid-core capsules were obtained by exposing MBs to 66% v/v ethanol solution. In the second step, the resulting liquid-core capsules were mixed with high concentration gold nanoparticles suspension and homogenized by a shaker (MS 3 basic, IKA, Königswinter Germany) at 500rpm for 1 hour for goal loading. The resulting gold loaded capsules were washed with Milli-Q water using centrifuge (Galaxy 5D digital microcentrifuge, VWR, USA) at a speed of 1000 g for 5 min.

    Results and discussion

    The mean diameter of MBs is 3.6±1.1 μm. The mean diameter of CACTUS MBs is 3.2±0.7 μm. The size distribution of the gold loaded capsules was not investigated separately, but rather assumed identical to the plain MBs. The number and the volume distribution of MBs and CACTUS MBs are shown in figure 1. The results demonstrate that most of the CACTUS MBs and MBs have a diameter from 1 to 6 μm. Therefore, they are able pass through the capillaries and will resonate within typical clinical diagnostic ultrasound frequency below 15 MHz.

    Pressure dependent acoustic attenuation coefficients of the sample A, B, and C are shown in figure 2. The results show that attenuation coefficients of sample A and B at the fundamental frequency stay constant and slightly increase at the second harmonic at the PNP below 100kPa, indicating a linear oscillation of MBs. As the PNP reaches 200kPa, the attenuation coefficient of sample A at fundamental frequency decreases while at 2nd and 3rd harmonics increases, indicating that the energy of the echo shifts from the fundamental frequency to the 2nd and 3rd harmonics. As the PNP goes higher to 300kPa, the attenuation coefficient of sample A at the fundamental frequency, 2nd, and 3rd harmonics decreases, suggesting that the energy shifts to an even higher harmonic. At the same time, the attenuation coefficient of sample B stays constant at fundamental frequency, decreases at 2nd harmonics, and increases at the 3rd harmonic, suggesting the energy starts to shift to the 3rd harmonic. The attenuation coefficient of sample C at fundamental frequency, 2nd and 3rd harmonics keep constant and low due to low sample concentration. The test reveals the energy shifting of the echo to the higher harmonics at PNP higher than 100 kPa, indicating the nonlinear oscillation of MBs at PNP higher than 100 kPa. Moreover, the concentration of the MBs seems to influence the energy shifting: the higher the concentration the earlier the shift to the higher harmonics occurs, in the range of the concentration consider in this study.

    The pilot results of the micro-CT tests are presented in Table 1. The reference, gold nanoparticles solution, has the highest CNR per voxel at all CT operating voltages. The CNR per voxel of CACTUS MBs suspensions is below 0.1, virtually equaling the MBs at all operating voltages, suggesting that no gold or very little gold were loaded into the shell of the CACTUS MBs. The gold loaded capsules suspension has higher CNR per voxel than the capsule supernatant (the surrounding environment of capsules) and the MBs suspension, implying that the gold nanoparticles were loaded into the capsules. However, it is not clear whether the gold nanoparticles were loaded in the core of the MBs or in the MBs shell. The expected sharp increase of CNR per voxel at the k-edge of gold did not appear. We believe that is because even at our highest operating voltage of 90kV, the percentage of the photons with energy higher than 80.7 keV is still low. Introduction of a high-pass metal filter could increase the percentage of high energy photon. On the other hand, the metal filter will reduce the total number of the photons which would increase the noise of the images. Since same current was applied on every CT test, less X-ray photons reached the sensors when the CT was operated at low voltage. Therefore, it might be worth performing additional calibration tests to adjust the operating currents to make sure that the numbers of the photons that reach the sensor at every operating voltage are the same.

    Conclusion

    In this study, the CACTUS MBs and gold loaded capsules were fabricated as potential candidates for dual modal contrast agent. The characterization revealed that gold loaded capsule is a promising initial step. Nevertheless, the method to convert back liquid-core capsules to gas-core MBs needs to be established.

    [1] Cavalieri, F., El Hamassi, A., Chiessi, E., Paradossi, G., Villa, R., & Zaffaroni, N. (2006). Tethering functional ligands onto shell of ultrasound active polymeric microbubbles. Biomacromolecules, 7(2), 604-611.

  • 169. Chen, J.
    et al.
    Wei, Jieqiang
    KTH, School of Electrical Engineering (EES), Automatic Control. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.
    Chen, Wei
    KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre. University of California at Berkeley, United States.
    Sandberg, Henrik
    KTH, School of Electrical Engineering (EES), Automatic Control. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.
    Johansson, Karl Henrik
    KTH, School of Electrical Engineering (EES), Automatic Control. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.
    Protecting Positive and Second-Order Systems against Undetectable Attacks2017In: IFAC-PapersOnLine, E-ISSN 2405-8963, Vol. 50, no 1, p. 8373-8378Article in journal (Refereed)
    Abstract [en]

    Undetectable attacks in security studies of cyber-physical systems render the measurements of the system equal to a possible physical response. In this paper, we investigate defense strategies against the undetectable single-attack for positive systems and second-order systems, which both can be reinterpreted in terms of graphs with nodes and edges, while the undetectable attack is added through one of the nodes. We show that an arbitrary placement of a sensor prevents undetectable single-attack for these classes of systems. It is worth emphasising that we do not need to measure at the corrupted node to prevent the undetectable single-attack, but can measure at any node. The defense strategy is of a low complexity and can be readily implemented.

  • 170.
    Chen, S.
    et al.
    Univ Hong Kong, Dept Phys, Pokfulam, Hong Kong 999077, Peoples R China.;RIKEN Nishina Ctr, Wako, Saitama 3510198, Japan.;Peking Univ, Sch Phys, Beijing 100871, Peoples R China.;Peking Univ, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China..
    Liu, H. N.
    KTH, School of Engineering Sciences (SCI), Physics. Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France.;Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany..
    Aktas, Özge
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Zanetti, L.
    RIKEN Nishina Ctr, Wako, Saitama 3510198, Japan.;Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany..
    Quasifree Neutron Knockout from Ca-54 Corroborates Arising N=34 Neutron Magic Number2019In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 123, no 14, article id 142501Article in journal (Refereed)
    Abstract [en]

    Exclusive cross sections and momentum distributions have been measured for quasifree one-neutron knockout reactions from a Ca-54 beam striking on a liquid hydrogen target at similar to 200 MeV/u. A significantly larger cross section to the p(3/2), state compared to the f(5/2) state observed in the excitation of Ca-53 provides direct evidence for the nature of the N = 34 shell closure. This finding corroborates the arising of a new shell closure in neutron-rich calcium isotopes. The distorted-wave impulse approximation reaction formalism with shell model calculations using the effective GXPF1Bs interaction and ab initio calculations concur our experimental findings. Obtained transverse and parallel momentum distributions demonstrate the sensitivity of quasifree one-neutron knockout in inverse kinematics on a thick liquid hydrogen target with the reaction vertex reconstructed to final state spin-parity assignments.

  • 171.
    Chen, Shi-Lu
    et al.
    KTH.
    Marino, Tiziana
    Fang, Wei-Hai
    Himo, Fahmi
    Russo, Nino
    KTH.
    Peptide hydrolysis by aminopeptidase from Aeromonas proteolytica2007In: Drugs of the future, ISSN 0377-8282, E-ISSN 2013-0368, Vol. 32, p. 71-72Article in journal (Other academic)
  • 172.
    Chen, Siyu
    et al.
    Univ Cambridge, Cavendish Lab, TCM Grp, JJ Thomson Ave, Cambridge CB3 0HE, England..
    Bouhon, Adrien
    Stockholm Univ, Nordic Inst Theoret Phys Nordita, Hannes Alfvens Vag 12, SE-10691 Stockholm, Sweden.;KTH Royal Inst Technol, Hannes Alfvens Vag 12, SE-10691 Stockholm, Sweden..
    Slager, Robert-Jan
    Univ Cambridge, Cavendish Lab, TCM Grp, JJ Thomson Ave, Cambridge CB3 0HE, England..
    Monserrat, Bartomeu
    Univ Cambridge, Cavendish Lab, TCM Grp, JJ Thomson Ave, Cambridge CB3 0HE, England.;Univ Cambridge, Dept Mat Sci & Met, 27 Charles Babbage Rd, Cambridge CB3 0FS, England..
    Non-Abelian braiding of Weyl nodes via symmetry-constrained phase transitions2022In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 105, no 8, article id L081117Article in journal (Refereed)
    Abstract [en]

    Weyl semimetals are arguably the most paradigmatic form of a gapless topological phase. While the stability of Weyl nodes, as quantified by their topological charge, has been extensively investigated, recent interest has shifted to the manipulation of the location of these Weyl nodes for non-Abelian braiding. To accomplish this braiding it is necessary to drive significant Weyl node motion using realistic experimental parameter changes. We show that a family of phase transitions characterized by certain symmetry constraints impose that the Weyl nodes have to reorganize by a large amount, shifting from one high-symmetry plane to another. Additionally, for a subset of pairs of nodes with nontrivial Euler class topology, this reorganization can only occur through a braiding process with adjacent nodes. As a result, the Weyl nodes are forced to move a large distance across the Brillouin zone and to braid, all driven by small temperature changes, a process we illustrate with Cd2Re2O7.

  • 173.
    Chen, Tao
    KTH. Leiden Observ, Leiden, Netherlands.
    Anharmonic temperature effects on the infrared spectrum2017In: Abstracts of Papers of the American Chemical Society, ISSN 0065-7727, Vol. 254Article in journal (Other academic)
  • 174.
    Chen, Tao
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Theoretical Chemistry and Biology.
    Zhen, J.
    Wang, Yin
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Theoretical Chemistry and Biology.
    Linnartz, H.
    Tielens, A. G. G. M.
    Photodissociation processes of Bisanthenquinone cation2017In: Proceedings of the International Astronomical Union, ISSN 1743-9213, no S332, p. 353-359Article in journal (Refereed)
    Abstract [en]

    A systematic study, using ion trap time-of-flight mass spectrometry, is presented for the photo-dissociation processes of Bisanthenquinone (Bq) cations, C28H12O2+, a ketone substituted Polycyclic Aromatic Hydrocarbon (PAH). The Bq cation fragments through sequential loss of the two neutral carbonyl (CO) units upon laser (626nm) irradiation, resulting in a PAH-like derivative C26H12+. Upon further irradiation, C26H12+ exhibits both stepwise dehydrogenation and C2/C2H2 loss fragmentation channels. Quantum chemistry calculations reveal a detailed picture for the first CO-loss, which involves a transition state with a barrier of ∼ 3.4 eV, which is lower than the energy required for the lowest H-loss pathway (∼ 5.0 eV). The barrier for the second CO-loss is higher (∼ 4.9 eV). The subsequent loss of this unit changes the Bq geometry from a planar to a bent one. It is concluded that the photodissociation mechanism of the substituted PAH cations studied here is site selective in the substituted subunit. This work also shows that an acetone substituted PAH cation is not photo-stable upon irradiation. 

  • 175.
    Chen, Wei
    et al.
    KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.
    Liu, Ji
    Chen, Yongxin
    Khong, Sei Zhen
    Wang, Dan
    Basar, Tamer
    Qiu, Li
    Johansson, Karl H.
    KTH, School of Electrical Engineering (EES), Automatic Control. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.
    Characterizing the Positive Semidefiniteness of Signed Laplacians via Effective Resistances2016In: 2016 IEEE 55th Conference on Decision and Control, CDC 2016, Institute of Electrical and Electronics Engineers (IEEE), 2016, p. 985-990, article id 7798396Conference paper (Refereed)
    Abstract [en]

    A symmetric signed Laplacian matrix uniquely defines a resistive electrical circuit, where the negative weights correspond to negative resistances. The positive semidefiniteness of signed Laplacian matrices is studied in this paper using the concept of effective resistance. We show that a signed Laplacian matrix is positive semidefinite with a simple zero eigenvalue if, and only if, the underlying graph is connected, and a suitably defined effective resistance matrix is positive definite.

  • 176.
    Chen, Wei
    et al.
    KTH, School of Electrical Engineering (EES), Automatic Control. Hong Kong Univ Sci & Technol, Peoples R China.
    Qiu, Li
    Linear Quadratic Optimal Control of Continuous-Time LTI Systems With Random Input Gains2016In: IEEE Transactions on Automatic Control, ISSN 0018-9286, E-ISSN 1558-2523, Vol. 61, no 7, p. 2008-2013Article in journal (Refereed)
    Abstract [en]

    This note studies the linear quadratic ( LQ) optimal control of continuous-time linear time-invariant systems with random gains imposed on the input channels. We start from the indefinite LQ problem, in which the cost weighting matrix can be indefinite. The definite LQ problem is discussed as a special case. The main novelty originates from the point of view that in networked control, designing the channels and controller jointly often leads to an easier problem and achieves better performance than designing them separately. Specifically, we formulate the LQ problem as a channel/controller co-design problem assuming that the channel capacities can be allocated among the input channels subject to an overall capacity constraint. Necessary and sufficient conditions are obtained for the well-posedness and the attainability of the indefinite LQ problem under a given channel capacity allocation satisfying the stabilization requirement. The optimal controller is given by a linear state feedback associated with the mean-square stabilizing solution of a modified algebraic Riccati equation.

  • 177.
    Chen, Wei
    et al.
    KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.
    Wang, D.
    Liu, J.
    Başar, T.
    Johansson, Karl H.
    KTH, School of Electrical Engineering (EES), Automatic Control.
    Qiu, L.
    On Semidefiniteness of Signed Laplacians with Application to Microgrids2016In: IFAC-PapersOnLine, E-ISSN 2405-8963, Vol. 49, no 22, p. 97-102Article in journal (Refereed)
    Abstract [en]

    The paper investigates the positive semidefiniteness of signed Laplacians. It is noted that a symmetric signed Laplacian defines a unique resistive electrical network, wherein the negative weights correspond to negative resistances. As such, the positive semidefiniteness of the signed Laplacians is equivalent to the passivity of the associated resistive networks. By utilizing n-port circuit theory, we obtain several equivalent conditions for signed Laplacians to be positive semidefinite with a simple zero eigenvalue. These conditions characterize a set of negative weights that maintain the semidefiniteness of the Laplacian. The results are used to analyze the small-disturbance angle stability of microgrids as an application.

  • 178.
    Chen, Weiwei
    et al.
    Changan Univ, Sch Informat Engn, Xian 710064, Peoples R China.;Xian Aeronaut Polytech Inst, Xian 710089, Peoples R China..
    Wang, Weixing
    KTH. Changan Univ, Sch Informat Engn, Xian 710064, Peoples R China..
    Wang, Kevin
    KTH.
    Leukocyte Extraction on Fractional Calculus and GVF Snake and Classification on SVM2020In: Basic & Clinical Pharmacology & Toxicology, ISSN 1742-7835, E-ISSN 1742-7843, Vol. 127, p. 15-15Article in journal (Other academic)
  • 179.
    Chen, Weiwei
    et al.
    Changan Univ, Sch Informat Engn, Xian 710064, Peoples R China.;Xian Aeronaut Polytech Inst, Xian 710089, Peoples R China..
    Wang, Weixing
    KTH. Changan Univ, Sch Informat Engn, Xian 710064, Peoples R China..
    Wang, Kevin
    KTH. Royal Inst Technol, S-10044 Stockholm, Sweden..
    Li, Zhaoying
    Audible Inc, Newark, NJ 07102 USA..
    Li, Huan
    Changan Univ, Sch Informat Engn, Xian 710064, Peoples R China..
    Liu, Sheng
    Xian Univ Technol, Sch Comp Sci & Engn, Xian 710048, Peoples R China..
    Lane departure warning systems and lane line detection methods based on image processing and semantic segmentation: A review2020In: Journal of Traffic and Transportation Engineering (English Edition), ISSN 2095-7564, Vol. 7, no 6, p. 748-774Article, review/survey (Refereed)
    Abstract [en]

    Recently, the development and application of lane line departure warning systems have been in the market. For any of the systems, the key part of lane line tracking, lane line identification, or lane line departure warning is whether it can accurately and quickly detect lane lines. Since 1990s, they have been studied and implemented for the situations defined by the good viewing conditions and the clear lane markings on road. After then, the accuracy for particular situations, the robustness for a wide range of scenarios, time efficiency and integration into higher-order tasks define visual lane line detection and tracking as a continuing research subject. At present, these kinds of lane marking line detection methods based on machine vision and image processing can be divided into two categories: the traditional image processing and semantic segmentation (includes deep learning) methods. The former mainly involves feature-based and model-based steps, and which can be classified into similarity- and discontinuity-based ones; and the model-based step includes different parametric straight line, curve or pattern models. The semantic segmentation includes different machine learning, neural network and deep learning methods, which is the new trend for the research and application of lane line departure warning systems. This paper describes and analyzes the lane line departure warning systems, image processing algorithms and semantic segmentation methods for lane line detection.

  • 180.
    Chen, Y. -J
    et al.
    School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China.
    Zhang, J. -W
    School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China.
    Chen, K. -X
    School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China.
    Zhou, Tao
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Chen, X. -H
    State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China.
    Pan, P.
    State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China.
    Wang, Zidong
    KTH.
    Microstructure and properties of trace Cr reinforced B10 alloy after deformation and heat treatment2020In: Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment, ISSN 1009-6264, Vol. 41, no 3, p. 55-61Article in journal (Refereed)
  • 181.
    Chen, Yiqi
    et al.
    KTH. Shanghai Jiao Tong University, Shanghai, China; .
    Oechtering, Tobias J.
    KTH, School of Electrical Engineering and Computer Science (EECS), Intelligent systems, Information Science and Engineering.
    Skoglund, Mikael
    KTH, School of Electrical Engineering and Computer Science (EECS), Intelligent systems, Information Science and Engineering.
    Luo, Yuan
    Shanghai Jiao Tong University, Shanghai, China.
    On Strong Secrecy for Multiple Access Channel with States and causal CSI2023In: 2023 IEEE International Symposium on Information Theory, ISIT 2023, Institute of Electrical and Electronics Engineers (IEEE) , 2023, p. 2744-2749Conference paper (Refereed)
    Abstract [en]

    Strong secrecy communication over a discrete memoryless state-dependent multiple access channel (SD-MAC) with an external eavesdropper is investigated. The channel is governed by discrete memoryless and i.i.d. channel states and the channel state information (CSI) is revealed to the encoders in a causal manner. An inner bound of the capacity is provided. To establish the inner bound, we investigate coding schemes incorporating wiretap coding and secret key agreement between the sender and the legitimate receiver. Two kinds of block Markov coding schemes are studied. The first one uses backward decoding and Wyner-Ziv coding and the secret key is constructed from a lossy reproduction of the CSI. The other one is an extended version of the existing coding scheme for point-to-point wiretap channels with causal CSI. We further investigate some capacity-achieving cases for state-dependent multiple access wiretap channels (SD-MAWCs) with degraded message sets. It turns out that the two coding schemes are both optimal in these cases.

  • 182.
    Chen, Yizhi
    et al.
    KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Electronics and Embedded systems, Electronic and embedded systems.
    Nevarez, Yarib
    University of Bremen, Institute of Electrodynamics and Microelectronics (ITEM.ids), Bremen, Germany.
    Lu, Zhonghai
    KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Electronics and Embedded systems, Electronic and embedded systems.
    Garcia-Ortiz, Alberto
    KTH, School of Electrical Engineering and Computer Science (EECS).
    Accelerating Non-Negative Matrix Factorization on Embedded FPGA with Hybrid Logarithmic Dot-Product Approximation2022In: Proceedings: 2022 IEEE 15th International Symposium on Embedded Multicore/Many-Core Systems-on-Chip, MCSoC 2022, Institute of Electrical and Electronics Engineers (IEEE) , 2022, p. 239-246Conference paper (Refereed)
    Abstract [en]

    Non-negative matrix factorization (NMF) is an ef-fective method for dimensionality reduction and sparse decom-position. This method has been of great interest to the scien-tific community in applications including signal processing, data mining, compression, and pattern recognition. However, NMF implies elevated computational costs in terms of performance and energy consumption, which is inadequate for embedded applications. To overcome this limitation, we implement the vector dot-product with hybrid logarithmic approximation as a hardware optimization approach. This technique accelerates floating-point computation, reduces energy consumption, and preserves accuracy. To demonstrate our approach, we employ a design exploration flow using high-level synthesis on an embedded FPGA. Compared with software solutions on ARM CPU, this hardware implementation accelerates the overall computation to decompose matrix by 5.597 × and reduces energy consumption by 69.323×. Log approximation NMF combined with KNN(k-nearest neighbors) has only 2.38% decreasing accuracy compared with the result of KNN processing the matrix after floating-point NMF on MNIST. Further on, compared with a dedicated floating-point accelerator, the logarithmic approximation approach achieves 3.718× acceleration and 8.345× energy reduction. Compared with the fixed-point approach, our approach has an accuracy degradation of 1.93% on MNIST and an accuracy amelioration of 28.2% on the FASHION MNIST data set without pre-knowledge of the data range. Thus, our approach has better compatibility with the input data range.

  • 183.
    Chen, Yuejun
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures. College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, 210098, China.
    Yang, James
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures.
    Yu, J.
    Fu, Z.
    Chen, Q.
    Flow Expansion and Deflection Downstream of a Symmetric Multi-gate Sluice Structure2020In: KSCE Journal of Civil Engineering, ISSN 1226-7988, E-ISSN 1976-3808, Vol. 24, no 2, p. 471-482Article in journal (Refereed)
    Abstract [en]

    A sluice structure with multiple gates is often followed by an enlarging channel downstream. Experiments are conducted for different enlargement ratios in cross-section and Froude numbers at the gates. A large-scale PIV system is adopted to capture the surface flow field for examination of the flow features. The study shows that, despite the centrally placed sluice structure with symmetric outflow, a hydraulic jump occurs and the main flow downstream exhibits, in terms of expansion and deflection, a high degree of asymmetry and formation of large circulation zones. The degree of deflection increases significantly along the longitudinal direction for all the enlargement ratios except the smallest. The toe of the hydraulic jump is controlled at the upper edge of the sloping surface downstream of the gates. In light of outflow width, Froude number and enlargement ratio, the flow is classified into three regions. Immediately downstream, the effect of outflow width gradually decreases with increasing Froude number. Further downstream, the degree of deflection augments with increasing enlargement ratio, with circulation zones. At a given cross-section, the degree of expansion is positively related to the enlargement ratio. The study is expected to provide guidance for examination of similar issues of flow pattern and erosion protection design.

  • 184.
    Cheng, Ming
    et al.
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry.
    Chen, Cheng
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.
    Aitola, Kerttu
    Zhang, Fuguo
    Hua, Yong
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.
    Boschloo, Gerrit
    Kloo, Lars
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.
    Sun, Licheng
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry. Dalian University of Technology (DUT), China.
    Highly Efficient Integrated Perovskite Solar Cells Containing a Small Molecule-PC70BM Bulk Heterojunction Layer with an Extended Photovoltaic Response Up to 900 nm2016In: Chemistry of Materials, ISSN 0897-4756, E-ISSN 1520-5002, Vol. 28, no 23, p. 8631-8639Article in journal (Refereed)
    Abstract [en]

    We demonstrate a high efficiency perovskite solar cell (PSC) integrated with a bulk heterojunction layer, based on acceptor-donor-acceptor (A-D-A) type hole transport material (HTM) and PC70BM composite, yielding improved photoresponse. Two A-D-A-structured hole transporting materials termed M3 and M4 were designed and synthesized. Applied as HTMs in PSCs, power conversion efficiencies (PCEs) of 14.8% and 12.3% were obtained with M3 and M4, respectively. The HTMs M3 and M4 show competitive absorption, but do not contribute to photocurrent, resulting in low current density. This issue was solved by mixing the HTMs with PC70BM to form a bulk heterojunction (BHJ) layer and integrating this layer into the PSC as hole transport layer (HTL). Through careful interface optimization, the (FAPbI(3))(0.85)(MAPbBr(3))(0.15)/HTM:PC70BM integrated devices showed improved efficiencies of 16.2% and 15.0%, respectively. More importantly, the incident-photon-to-current conversion efficiency (IPCE) spectrum shows that the photoresponse is extended to 900 nm by integrating the M4:PC70BM based BHJ and (FAPbI(3))(0.85)(MAPbBr(3))(0.15) layers.

  • 185.
    Chernik, Charles
    et al.
    KTH, School of Electrical Engineering and Computer Science (EECS), Intelligent systems, Robotics, Perception and Learning, RPL.
    Tajvar, Pouria
    KTH, School of Electrical Engineering and Computer Science (EECS), Intelligent systems, Robotics, Perception and Learning, RPL.
    Tumova, Jana
    KTH, School of Electrical Engineering and Computer Science (EECS), Intelligent systems, Robotics, Perception and Learning, RPL.
    Robust Feedback Motion Primitives for Exploration of Unknown Terrains2021In: 2021 IEEE International Conference on Intelligent Robots and Systems (IROS), Institute of Electrical and Electronics Engineers Inc. , 2021, p. 8173-8179Conference paper (Refereed)
    Abstract [en]

    Unknown properties of a robot's environment are one of the sources of uncertainty in autonomous navigation. This uncertainty has to be accounted for when modelling robot dynamics. For ground vehicles in particular, terrain structure is one of the main environmental factors that can strongly influence the dynamics. Therefore, to ensure the ability of a robot to safely and efficiently navigate new environments, robust motion planning and control systems are needed. This paper investigates a data-driven approach to planning and control based on construction of robust motion primitives (MPs) and corresponding feedback rules that ensure a bounded error along the planned trajectory. The approach is tested in an exploration scenario in which a robot systematically inspects an area consisting of several terrain types with the aim of recognizing changes in dynamical properties, learning new dynamics models when such changes are detected and recording that information for future use. The advantage of incorporating the collected data into motion planning in multi-terrain environments is illustrated via simulation. 

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  • 186.
    Choubey, Sandhya
    et al.
    KTH, School of Biotechnology (BIO), Centres, Albanova VinnExcellence Center for Protein Technology, ProNova. KTH, School of Engineering Sciences (SCI), Physics. Harish-Chandra Research Institute, Chhatnag Road, Jhunsi, Allahabad, 211 019, India; Homi Bhabha National Institute, Mumbai, 400085, India.
    Goswami, S.
    Gupta, C.
    KTH, School of Biotechnology (BIO), Centres, Albanova VinnExcellence Center for Protein Technology, ProNova. Homi Bhabha National Institute, Mumbai, 400085, India.
    Mohan, L. S.
    Thakore, T.
    Study of invisible neutrino decay and oscillation in the presence of matter with a 50 kton magnetised iron detector2017In: Proceedings of Science, Sissa Medialab Srl , 2017Conference paper (Refereed)
    Abstract [en]

    The sensitivity to the invisible decay of the mass eigenstate ν3 in the presence of Earth matter effects is studied. Only the charged current interactions of atmospheric νµ and νµ for 500 kTon year exposure of a future magnetised iron detector at INO are analysed. The analysis with observed muon energy in the range would give a constraint of τ3/m3 > 1.51×10−10 s/eV at 90% CL with this exposure. Here τ3 is the lifetime and m3 is the mass of ν3, when it is the heaviest. The effect of decay on the precision measurement of sin2 θ23 and |∆m232| and neutrino mass hierarchy are also studied. Since the presence of decay affects the oscillation amplitude rather than its phase, it is seen that the precision on sin2 θ23 worsens whereas that on |∆m232| is not much affected. Sensitivity to hierarchy also worsens slightly in the presence of the invisible decay of ν3

  • 187. Choudhari, M.
    et al.
    Lockard, D. P.
    Jenkins,
    Neuhart,
    Choudhari,
    Cattafesta,
    Murayama,
    Yamamoto,
    Ura,
    Ito,
    Vilela de Abreu, Rodrigo
    KTH.
    Hoffman,
    Jansson,
    KTH.
    Lockard,
    Ueno,
    Knacke,
    Thiele,
    Dahan,
    Tamaki,
    Imamura,
    Tanaka,
    Amemiya,
    Hirai,
    Ashton,
    West,
    Mendonca,
    Housman,
    Kiris,
    Ribeiro,
    Fares,
    Casalino,
    Terracol,
    Ewert,
    Boenke,
    Simoes,
    Bonatto,
    Souza,
    Medeiros,
    Bodart,
    Larsson,
    Moin,
    Assessment of slat noise predictions for 30P30N high- lift configuration from Banc-III workshop2015In: 21st AIAA/CEAS Aeroacoustics Conference, American Institute of Aeronautics and Astronautics Inc, AIAA , 2015Conference paper (Refereed)
    Abstract [en]

    This paper presents a summary of the computational predictions and measurement data contributed to Category 7 of the 3rd AIAA Workshop on Benchmark Problems for Airframe Noise Computations (BANC-III), which was held in Atlanta, GA, on June 14-15, 2014. Category 7 represents the first slat-noise configuration to be investigated under the BANC series of workshops, namely, the 30P30N two-dimensional high-lift model (with a slat contour that was slightly modified to enable unsteady pressure measurements) at an angle of attack that is relevant to approach conditions. Originally developed for a CFD challenge workshop to assess computational fluid dynamics techniques for steady high-lift predictions, the 30P30N configurations has provided a valuable opportunity for the airframe noise community to collectively assess and advance the computational and experimental techniques for slat noise. The contributed solutions are compared with each other as well as with the initial measurements that became available just prior to the BANC-III Workshop. Specific features of a number of computational solutions on the finer grids compare reasonably well with the initial measurements from FSU and JAXA facilities and/or with each other. However, no single solution (or a subset of solutions) could be identified as clearly superior to the remaining solutions. Grid sensitivity studies presented by multiple BANC-III participants demonstrated a relatively consistent trend of reduced surface pressure fluctuations, higher levels of turbulent kinetic energy in the flow, and lower levels of both narrow band peaks and the broadband component of unsteady pressure spectra in the nearfield and farfield. The lessons learned from the BANC-III contributions have been used to identify improvements to the problem statement for future Category-7 investigations.

  • 188.
    Choy, Wallace C. H.
    et al.
    Univ Hong Kong, Dept Elect & Elect Engn, Pokfulam Rd, Hong Kong, Hong Kong, Peoples R China..
    Chen, X. W.
    KTH.
    Fong, H. H.
    Cornell Univ, Dept Mat Sci & Engn, Ithaca, NY 14853 USA..
    He, Sailing
    KTH.
    Comprehensive Investigation of Light Emission of OLEDs: from Absolute Optical Properties to the Purcell effect2008In: AOE 2007: ASIA OPTICAL FIBER COMMUNICATION & OPTOELECTRONIC EXPOSITION & CONFERENCE, CONFERENCE PROCEEDINGS, AOE , 2008, p. 354-+Conference paper (Refereed)
    Abstract [en]

    The dispersively absolute absorption coefficient and refractive index as well as the Purcell effect have been theoretically and experimentally studied for optimizing the light emission properties of organic light emitting devices.

  • 189.
    Choy, Wallace C. H.
    et al.
    Univ Hong Kong, Dept Elect & Elect Engn, Pokfulam Rd, Hong Kong, Hong Kong, Peoples R China..
    Chen, Xuewen
    KTH.
    He, Sailing
    KTH. eoples R China..
    Chui, P. C.
    The Purcell Effect of Silver Nanoshell on the Fluorescence of Nanoparticles2008In: AOE 2007: ASIA OPTICAL FIBER COMMUNICATION & OPTOELECTRONIC EXPOSITION & CONFERENCE, CONFERENCE PROCEEDINGS, AOE , 2008, p. 81-+Conference paper (Refereed)
    Abstract [en]

    The Purcell effect on the spontaneously emission rate and fluorescence efficiency of nanoparticles with and without a silver nanoshell will be investigated which are important for nanoparticle applications in biomedical diagnostics, information storage and optoelectronics

  • 190.
    Christensen, H I
    KTH.
    Cognitive vision2004In: The AI Magazine, ISSN 0738-4602, Vol. 25, no 2, p. 8-9Article in journal (Other academic)
    Abstract [en]

    The integration of AI and vision has been a longterm goal of both disciplines for more than three decades. This special issue illustrates some recent work on bridging the gap.

  • 191.
    Christiansen, F.
    et al.
    KTH, School of Engineering Sciences (SCI).
    Epstein, E. L.
    KTH, School of Engineering Sciences (SCI).
    Smedberg, E.
    Karolinska Inst, Dept Clin Sci & Educ, Sjukhusbacken 10, S-11883 Stockholm, Sweden.;Soder Sjukhuset, Dept Obstet & Gynecol, Sjukhusbacken 10, S-11883 Stockholm, Sweden..
    Akerlund, M.
    Harvard Univ, Harvard Extens Sch, Cambridge, MA 02138 USA..
    Smith, Kevin
    KTH, Centres, Science for Life Laboratory, SciLifeLab. KTH, School of Electrical Engineering and Computer Science (EECS), Computer Science, Computational Science and Technology (CST).
    Epstein, E.
    Karolinska Inst, Dept Clin Sci & Educ, Sjukhusbacken 10, S-11883 Stockholm, Sweden.;Soder Sjukhuset, Dept Obstet & Gynecol, Sjukhusbacken 10, S-11883 Stockholm, Sweden..
    Ultrasound image analysis using deep neural networks for discriminating between benign and malignant ovarian tumors: comparison with expert subjective assessment2021In: Ultrasound in Obstetrics and Gynecology, ISSN 0960-7692, E-ISSN 1469-0705, Vol. 57, no 1, p. 155-163Article in journal (Refereed)
    Abstract [en]

    Objectives: To develop and test the performance of computerized ultrasound image analysis using deep neural networks (DNNs) in discriminating between benign and malignant ovarian tumors and to compare its diagnostic accuracy with that of subjective assessment (SA) by an ultrasound expert. Methods: We included 3077 (grayscale, n = 1927; power Doppler, n = 1150) ultrasound images from 758 women with ovarian tumors, who were classified prospectively by expert ultrasound examiners according to IOTA (International Ovarian Tumor Analysis) terms and definitions. Histological outcome from surgery (n = 634) or long-term (>= 3 years) follow-up (n = 124) served as the gold standard. The dataset was split into a training set (n = 508; 314 benign and 194 malignant), a validation set (n = 100; 60 benign and 40 malignant) and a test set (n = 150; 75 benign and 75 malignant). We used transfer learning on three pre-trained DNNs: VGG16, ResNet50 and MobileNet. Each model was trained, and the outputs calibrated, using temperature scaling. An ensemble of the three models was then used to estimate the probability of malignancy based on all images from a given case. The DNN ensemble classified the tumors as benign or malignant (Ovry-Dx1 model); or as benign, inconclusive or malignant (Ovry-Dx2 model). The diagnostic performance of the DNN models, in terms of sensitivity and specificity, was compared to that of SA for classifying ovarian tumors in the test set. Results: At a sensitivity of 96.0%, Ovry-Dx1 had a specificity similar to that of SA (86.7% vs 88.0%; P = 1.0). Ovry-Dx2 had a sensitivity of 97.1% and a specificity of 93.7%, when designating 12.7% of the lesions as inconclusive. By complimenting Ovry-Dx2 with SA in inconclusive cases, the overall sensitivity (96.0%) and specificity (89.3%) were not significantly different from using SA in all cases (P = 1.0). Conclusion: Ultrasound image analysis using DNNs can predict ovarian malignancy with a diagnostic accuracy comparable to that of human expert examiners, indicating that these models may have a role in the triage of women with an ovarian tumor.

  • 192. Christou, Nina Eleni
    et al.
    Lane, Thomas J.
    et al.,
    Time-resolved crystallography captures light-driven DNA repair2023In: Science, ISSN 0036-8075, E-ISSN 1095-9203, Vol. 382, no 6674, p. 1015-1020Article in journal (Refereed)
    Abstract [en]

    Photolyase is an enzyme that uses light to catalyze DNA repair. To capture the reaction intermediates involved in the enzyme's catalytic cycle, we conducted a time-resolved crystallography experiment. We found that photolyase traps the excited state of the active cofactor, flavin adenine dinucleotide (FAD), in a highly bent geometry. This excited state performs electron transfer to damaged DNA, inducing repair. We show that the repair reaction, which involves the lysis of two covalent bonds, occurs through a single-bond intermediate. The transformation of the substrate into product crowds the active site and disrupts hydrogen bonds with the enzyme, resulting in stepwise product release, with the 3' thymine ejected first, followed by the 5' base.

  • 193.
    Chu, Liliang
    et al.
    KTH, School of Information and Communication Technology (ICT), Centres, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    Wang, Shaowei
    KTH, School of Information and Communication Technology (ICT), Centres, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    Li, Kanghui
    KTH, School of Information and Communication Technology (ICT), Centres, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    Xi, Wang
    Zhao, Xinyuan
    Qian, Jun
    KTH, School of Information and Communication Technology (ICT), Centres, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    Biocompatible near-infrared fluorescent nanoparticles for macro and microscopic in vivo functional bioimaging2014In: Biomedical Optics Express, E-ISSN 2156-7085, Vol. 5, no 11, p. 4076-4088Article in journal (Refereed)
    Abstract [en]

    Near-infrared (NIR) imaging technology has been widely used for biomedical research and applications, since it can achieve deep penetration in biological tissues due to less absorption and scattering of NIR light. In our research, polymer nanoparticles with NIR fluorophores doped were synthesized. The morphology, absorption/emission features and chemical stability of the fluorescent nanoparticles were characterized, separately. NIR fluorescent nanoparticles were then utilized as bright optical probes for macro in vivo imaging of mice, including sentinel lymph node (SLN) mapping, as well as distribution and excretion monitoring of nanoparticles in animal body. Furthermore, we applied the NIR fluorescent nanoparticles in in vivo microscopic bioimaging via a confocal microscope. Under the 635 nm-CW excitation, the blood vessel architecture in the ear and the brain of mice, which were administered with nanoparticles, was visualized very clearly. The imaging depth of our one-photon microscopy, which was assisted with NIR fluorescent nanoprobes, can reach as deep as 500 mu m. Our experiments show that NIR fluorescent nanoparticles have great potentials in various deep-tissue imaging applications.

  • 194.
    Cifuentes, Luis
    et al.
    KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. Univ Duisburg Essen, Chair Fluid Dynam, Inst Combust & Gasdynam IVG, D-47057 Duisburg, Germany..
    Fooladgar, Ehsan
    KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.
    Duwig, Christophe
    KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.
    Chemical Explosive Mode Analysis for a Jet-in-Hot-Coflow burner operating in MILD combustion2018In: Fuel, ISSN 0016-2361, E-ISSN 1873-7153, Vol. 232, p. 712-723Article in journal (Refereed)
    Abstract [en]

    Large Eddy Simulations (LES) of Moderate and Intense Low oxygen Dilution (MILD) combustion of a Jet-in-HotCoflow (JHC) burner were performed using detailed chemistry. On the contrary to traditional flames, where heat release is occurring in very thin fronts, MILD combustion occurs in the distributed reaction regime where the reaction zone is broad, thus, this paper applies a direct Arrhenius closure with detailed chemistry to resolve important details of the fuel oxidation reactions. Comparisons of LES results are in good agreement with experiments, demonstrating that the simulations capture the intermediate species and finite reaction rate effects. A Chemical Explosive Mode Analysis (CEMA) was used to determine the flame structure and to detect the pre-and post-ignition regions, including the contributions to the CEMs analyzing the Explosion Index (EI) and Participation Index (PI). To the best of our knowledge, a detailed study of CEMA on MILD or flameless regime has never been reported. The flame structure was clearly visualized with CEMA, as well as the lean and the rich flame fronts. Different flame zones close to the anchoring points of these turbulent lifted flames were selected and the analysis demonstrates the contributions of dominant chemical species, such as HO2 and O. The reactions related to the dominant local CEM were obtained to highlight the nature of the stabilization in these highly diluted operating conditions.

  • 195.
    Colozza, Noemi
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry. Univ Roma Tor Vergata, Dept Chem Sci & Technol, Via Ric Sci, I-00133 Rome, Italy..
    Casanova, Ana
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry.
    Fernandez-Perez, Bibiana M.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry.
    Crespo, Gaston A.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Applied Physical Chemistry.
    Flores, Gabriel A.
    Florida Int Univ, Dept Chem & Biochem, 11200 SW 8th St, Miami, FL 33199 USA.;Florida Int Univ, Biomol Sci Inst, 11200 SW 8th St, Miami, FL 33199 USA..
    Kavallieratos, Konstantinos
    Florida Int Univ, Dept Chem & Biochem, 11200 SW 8th St, Miami, FL 33199 USA.;Florida Int Univ, Biomol Sci Inst, 11200 SW 8th St, Miami, FL 33199 USA..
    Juan Angel, de Gracia Triviño
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Theoretical Chemistry and Biology.
    Ahlquist, Mårten S. G.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry.
    Cuartero, Maria
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Applied Physical Chemistry.
    Insights into Tripodal Tris(pyrazolyl) Compounds as Ionophores for Potentiometric Ammonium Ion Sensing2022In: ChemElectroChem, E-ISSN 2196-0216, Vol. 9, no 18, article id e202200716Article in journal (Refereed)
    Abstract [en]

    The decentralisation of accurate determination of the ammonium ion (NH4+) is relevant for environmental monitoring (i. e., nitrogen cycle) and certain clinical applications (e. g., kidney and liver diseases). Potentiometric ionophore-based sensors are one alternative for these purposes in terms of versatile implementation, though the potassium ion (K+) is known to be a major source of interference. We herein investigate the use of three different tripodal tris(pyrazolyl) compounds derived from 1,3,5-triethylbenzene as NH4+ ionophores. A complete set of potentiometric experiments together with theoretical simulations reveals suitable analytical performance while demonstrating a suppression of the K+ interference given the formation of an adequate cavity in the ionophore to host NH4+ over K+ in the membrane environment. The results support the use of these electrodes in the analytical detection of NH4+ in a wide range of samples with variable contents.

  • 196.
    Cornelius, Hugo
    et al.
    KTH, Superseded Departments (pre-2005), Numerical Analysis and Computer Science, NADA.
    Sara, Radim
    Martinec, Daniel
    KTH, Superseded Departments (pre-2005), Numerical Analysis and Computer Science, NADA.
    Pajdla, Tomas
    KTH, Superseded Departments (pre-2005), Numerical Analysis and Computer Science, NADA.
    Chum, Ondrej
    KTH, Superseded Departments (pre-2005), Numerical Analysis and Computer Science, NADA.
    Matas, Jiri
    KTH, Superseded Departments (pre-2005), Numerical Analysis and Computer Science, NADA.
    Towards complete free-form reconstruction of complex 3D scenes from an unordered set of uncalibrated images2004In: STATISTICAL METHODS IN VIDEO PROCESSING / [ed] Comaniciu, D; Kanatani, K; Mester, R; Suter, D, BERLIN: SPRINGER , 2004, Vol. 3247, p. 1-12Conference paper (Refereed)
    Abstract [en]

    This paper describes a method for accurate dense reconstruction of a complex scene from a small set of high-resolution unorganized still images taken by a hand-held digital camera. A fully automatic data processing pipeline is proposed. Highly discriminative features are first detected in all images. Correspondences are then found in all image pairs by wide-baseline stereo matching and used in a scene structure and camera reconstruction step that can cope with occlusion and outliers. Image pairs suitable for dense matching are automatically selected, rectified and used in dense binocular matching. The dense point cloud obtained as the union of all pairwise reconstructions is fused by local approximation using oriented geometric primitives. For texturing, every primitive is mapped on the image with the best resolution. The global structure reconstruction in the first step allows us to work with an unorganized set of images and to avoid error accumulation. By using object-centered geometric primitives we are able to preserve the flexibility of the method to describe complex free-form structures, preserve the possibility to build the dense model in an incremental way, and to retain the possibility to refine the cameras and the dense model by bundle adjustment. Results are demonstrated on partial models of a circular church and a Henri de Miller's sculpture. We observed spatial resolution in the range of centimeters on objects of about 20 m in size.

  • 197.
    Cortes, M. L.
    et al.
    RIKEN, Nishina Ctr, 2-1 Hirosawa, Wako, Saitama 3510198, Japan.;Ist Nazl Fis Nucl, Lab Nazl Legnaro, I-35020 Legnaro, Italy..
    Liu, H. N.
    KTH, School of Engineering Sciences (SCI), Physics. Univ Paris Saclay, IRFU, CEA, F-91191 Gif Sur Yvette, France.;Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany..
    Aktas, Özge
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Zanetti, L.
    Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany..
    N=32 shell closure below calcium: Low-lying structure of Ar-502020In: Physical Review C: Covering Nuclear Physics, ISSN 2469-9985, E-ISSN 2469-9993, Vol. 102, no 6, article id 064320Article in journal (Refereed)
    Abstract [en]

    Low-lying excited states in the N = 32 isotope Ar-50 were investigated by in-beam gamma-ray spectroscopy following proton- and neutron-knockout, multinucleon removal, and proton inelastic scattering at the RIKEN Radioactive Isotope Beam Factory. The energies of the two previously reported transitions have been confirmed, and five additional states are presented for the first time, including a candidate for a 3(-) state. The level scheme built using gamma gamma coincidences was compared to shell-model calculations in the sd-pf model space and to ab initio predictions based on chiral two- and three-nucleon interactions. Theoretical proton- and neutron-knockout cross sections suggest that two of the new transitions correspond to 2(+) states, while the previously proposed 4(1)(+) state could also correspond to a 2(+) state.

  • 198.
    Cortes, M. L.
    et al.
    RIKEN, Nishina Ctr, 2-1 Hirosawa, Wako, Saitama 3510198, Japan.;Ist Nazl Fis Nucl, Lab Nazl Legnaro, I-35020 Legnaro, Italy..
    Liu, H. N.
    KTH, School of Engineering Sciences (SCI), Physics.
    Aktas, Özge
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Zanetti, L.
    Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany..
    et al.,
    Shell evolution of N=40 isotones towards Ca-60: First spectroscopy of Ti-622020In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 800, article id 135071Article in journal (Refereed)
    Abstract [en]

    Excited states in the N = 40 isotone Ti-62 were populated via the V-63( p, 2p)Ti-62 reaction at similar to 200MeV/nucleonat the Radioactive Isotope Beam Factory and studied using gamma-ray spectroscopy. The energies of the 2(1)(+) -> 0(gs)(+) and 4(1)(+) -> 2(1)(+) transitions, observed here for the first time, indicate a deformed Ti-62 ground state. These energies are increased compared to the neighboring Cr-64 and Fe-66 isotones, suggesting a small decrease of quadrupole collectivity. The present measurement is well reproduced by large-scale shell-model calculations based on effective interactions, while ab initio and beyond mean-field calculations do not yet reproduce our findings. The shell-model calculations for Ti-62 show a dominant configuration with four neutrons excited across the N = 40 gap. Likewise, they indicate that the N = 40 island of inversion extends down to Z = 20, disfavoring a possible doubly magic character of the elusive Ca-60.

  • 199.
    Crescenzo, Domenico
    et al.
    KTH.
    Olsson, Viktor
    KTH.
    Arco Sola, Javier
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
    Wu, Hongwen
    KTH.
    Cronhjort, Andreas
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Internal Combustion Engines.
    Lycke, Eric
    Leufven, O.
    Stenlåås, Ola
    Turbocharger Speed Estimation via Vibration Analysis2016In: SAE technical paper series, ISSN 0148-7191, Vol. 2016-April, no AprilArticle in journal (Refereed)
    Abstract [en]

    Due to demanding legislation on exhaust emissions for internal combustion engines and increasing fuel prices, automotive manufacturers have focused their efforts on optimizing turbocharging systems. Turbocharger system control optimization is difficult: Unsteady flow conditions combined with not very accurate compressor maps make the real time turbocharger rotational speed one of the most important quantities in the optimization process. This work presents a methodology designed to obtain the turbocharger rotational speed via vibration analysis. Standard knock sensors have been employed in order to achieve a robust and accurate, yet still a low-cost solution capable of being mounted on-board. Results show that the developed method gives an estimation of the turbocharger rotational speed, with errors and accuracy acceptable for the proposed application. The method has been evaluated on a heavy duty diesel engine.

  • 200.
    Crocetti, Roberto
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Materials.
    Lappalainen, Kaj
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering.
    Backman, Matthias
    KTH.
    Wålinder, Magnus
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Materials.
    Norén, J.
    Multiple shear plane connections with timber based gusset plates2021In: World Conference on Timber Engineering 2021, WCTE 2021, World Conference on Timber Engineering (WCTE) , 2021Conference paper (Refereed)
    Abstract [en]

    This paper presents the results of an experimental study conducted on multiple-shear joints consisting of gusset plates made of either LVL or plywood connected to the timber members by means of full-threaded self-tapping screw. Both hardwood and softwood timber based gusset plates with different thickness and face grain orientations were investigated. The results show that this type of connection has an excellent structural performance, with not very dissimilar strength from that of comparable connections which makes use of slotted-in steel plates and dowels. It is believed, therefore, that the proposed solution can be a valid alternative to the more traditional timber connection with slotted-in steel plates and dowels.

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