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  • 51.
    Arandia, Kenneth
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center. Chalmers.
    Balyan, U.
    Mattsson, Tuve
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center. Chalmers.
    Development of a fluid dynamic gauging method for the characterization of fouling behavior during cross-flow filtration of a wood extraction liquor2021In: Food and Bioproducts Processing, ISSN 0960-3085, E-ISSN 1744-3571, Vol. 128, p. 30-40Article in journal (Refereed)
    Abstract [en]

    A method based on fluid dynamic gauging (FDG) was developed to investigate the membrane fouling behavior of streams containing dissolved wood components and small particles extracted using a mild steam explosion pretreatment. Industrially chipped softwood was subjected to saturated steam at 7 bar for 20 min, followed by cross-flow filtration of steam explosion liquors using 10 kDa polysulfone membranes at 2 bar transmembrane pressure. The results showed a severe decline in permeate flux during the initial stages of the cross-flow filtration. The FDG profiles from five filtration experiments revealed that thicker fouling layers were formed during initial fouling on pristine membranes compared to subsequent fouling on non-pristine membranes. The difference in fouling behavior suggests that cake layer formation was dominant during initial fouling, whereas pore blocking was more pronounced during refouling. This study highlights how FDG can be used to gain a better mechanistic understanding of the fouling behavior of extracted wood components.

  • 52.
    Araújo De Medeiros, Daniel
    et al.
    KTH, School of Electrical Engineering and Computer Science (EECS), Computer Science, Computational Science and Technology (CST).
    Schieffer, Gabin
    KTH, School of Electrical Engineering and Computer Science (EECS), Computer Science, Computational Science and Technology (CST).
    Wahlgren, Jacob
    KTH, School of Electrical Engineering and Computer Science (EECS), Computer Science, Computational Science and Technology (CST).
    Peng, Ivy
    KTH.
    A GPU-Accelerated Molecular Docking Workflow with Kubernetes and Apache Airflow2023In: High Performance Computing: ISC High Performance 2023 International Workshops, Revised Selected Papers, Springer Nature , 2023, p. 193-206Conference paper (Refereed)
    Abstract [en]

    Complex workflows play a critical role in accelerating scientific discovery. In many scientific domains, efficient workflow management can lead to faster scientific output and broader user groups. Workflows that can leverage resources across the boundary between cloud and HPC are a strong driver for the convergence of HPC and cloud. This study investigates the transition and deployment of a GPU-accelerated molecular docking workflow that was designed for HPC systems onto a cloud-native environment with Kubernetes and Apache Airflow. The case study focuses on state-of-of-the-art molecular docking software for drug discovery. We provide a DAG-based implementation in Apache Airflow and technical details for GPU-accelerated deployment. We evaluated the workflow using the SWEETLEAD bioinformatics dataset and executed it in a Cloud environment with heterogeneous computing resources. Our workflow can effectively overlap different stages when mapped onto different computing resources.

  • 53.
    Arce, Luis
    et al.
    KTH, Centres, Science for Life Laboratory, SciLifeLab. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Gene Technology.
    Serrano, Irene
    Division of Plant Science, Research School of Biology, Australian National University, Acton, Australian Capital Territory, Australia.
    Impact of childhood trauma on the epigenetics of anxiety disorder2023In: Revista de Psiquiatria Clínica, ISSN 0101-6083, E-ISSN 1806-938X, Vol. 50, no 6, p. 205-211Article in journal (Refereed)
    Abstract [en]

    The interaction of epigenetics, childhood trauma, and anxiety disorders is a fascinating area of scientific study with significant ramifications for clinical practice and mental health. This abstract captures the intricate interplay between these factors, emphasizing how early-life hardships leave persistent biochemical fingerprints on a person's genetic composition, perhaps influencing the emergence of anxiety disorders. Through epigenetic pathways, childhood trauma, which includes events like abuse, neglect, and persistent stress, might influence a person's sensitivity to anxiety. These processes, which control the expression of genes involved in stress response, neurotransmitter signaling, and emotional regulation, include DNA methylation, histone changes, and microRNA regulation. The disturbance of the hypothalamic-pituitary-adrenal (HPA) axis and neuroplasticity provide as more evidence of the effects of trauma-induced epigenetic modifications, which manifest as altered brain circuits and stress response mechanisms. This complex interaction highlights how nature and nurture interact dynamically, enhancing our knowledge of the many-faceted causes of anxiety disorders. A need for focused treatments and therapies that address the molecular causes of anxiety is made as a result of the recognition of the long-lasting impacts of childhood trauma, giving those who are afflicted hope for better mental health outcomes and resilience.

  • 54.
    Ashitani, Tatsuya
    et al.
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry. Yamagata University, Japan.
    Garboui, S. S.
    Schubert, Fredrik
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry.
    Vongsombath, Chanda
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry. National University of Laos (NOUL), Laos.
    Liblikas, I.
    Pålsson, Katinka
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry.
    Borg-Karlson, Anna-Karin
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry. Institute of Technology, Estonia.
    Activity studies of sesquiterpene oxides and sulfides from the plant Hyptis suaveolens (Lamiaceae) and its repellency on Ixodes ricinus (Acari: Ixodidae)2015In: Experimental & applied acarology, ISSN 0168-8162, E-ISSN 1572-9702Article in journal (Refereed)
    Abstract [en]

    Hyptis suaveolens (Lamiaceae), a plant traditionally used as a mosquito repellent, has been investigated for repellent properties against nymphs of the tick Ixodesricinus. Essential oils and volatile compounds of fresh and dried leaves, from plants originating from Laos and Guinea-Bissau, were identified by GC–MS and tested in a tick repellency bioassay. All the essential oils were strongly repellent against the ticks, even though the main volatile constituents differed in their proportions of potentially tick repellent chemicals. (+)/(−)-sabinene were present in high amounts in all preparations, and dominated the emission from dry and fresh leaves together with 1,8-cineol and α-phellandrene. 1,8-Cineol and sabinene were major compounds in the essential oils from H. suaveolens from Laos. Main compounds in H. suaveolens from Guinea-Bissau were (−)-sabinene, limonene and terpinolene. Among the sesquiterpene hydrocarbons identified, α-humulene exhibited strong tick repellency (96.8 %). Structure activity studies of oxidation or sulfidation products of germacrene D, α-humulene and β-caryophyllene, showed increased tick repellent activity: of mint sulfide (59.4 %), humulene-6,7-oxide (94.5 %) and caryophyllene-6,7-oxide (96.9 %). The substitution of oxygen with sulfur slightly lowered the repellency. The effects of the constituents in the oils can then be regarded as a trade off between the subsequently lower volatility of the sesquiterpene derivatives compared to the monoterpenes and may thus increase their potential usefulness as tick repellents.

  • 55.
    Asplund, C.
    et al.
    KTH.
    Uhlén, Mathias
    KTH, Superseded Departments (pre-2005), Biotechnology. Royal Inst Technol, Stockholm, Sweden..
    Lundeberg, Joakim
    KTH.
    Persson, A.
    KTH.
    Real-time RT-PCR of protein epitope signature tags2005In: Molecular & Cellular Proteomics, ISSN 1535-9476, E-ISSN 1535-9484, Vol. 4, no 8, p. S60-S60Article in journal (Other academic)
  • 56.
    Aswad, Ali
    et al.
    Department of Mechatronics Engineering, Tishreen University, Lattakia, Syria.
    Alghannam, Essa
    Department of Mechatronics Engineering, Tishreen University, Lattakia, Syria; School of Engineering, Manara University, Lattakia, Syria; Wuhan University of Technology, Wuhan, China.
    Zhang, Qingying
    KTH. Wuhan University of Technology, Wuhan, China.
    Developing MFCC-CNN Based Voice Recognition System with Data Augmentation and Overfitting Solving Techniques2023In: Lecture Notes on Data Engineering and Communications Technologies, Springer Nature , 2023, Vol. 159, p. 115-125Chapter in book (Other academic)
    Abstract [en]

    The ever-increasing need for intelligent systems technology capable of enhancing human-machine interaction in different areas of life has become a very important topic. However, since speech is the main used method of communication, deep Learning-based speech recognition systems still have poor performance when trained on small datasets. To solve this problem, an automated speech recognition system based on a convolutional neural network and MFCC algorithm, is proposed in this paper. Firstly, the data augmentation technique is applied to the dataset in order to double it. Then, MFCCs are extracted from all the audio files. After that, CNN model is trained on the MFCCs with the help of early stopping and dropout techniques to prevent the overfitting problem. Finally, the best model with the highest performance is selected. Simulation results on Kaggle TensorFlow Speech Recognition Challenge dataset, which contains 20 basic command words, showed that the selected model achieved 88.35% accuracy.

  • 57.
    Atoufi, Zhaleh
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology, Fibre Technology.
    Gordeyeva, Korneliya
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology, Fiberprocesser.
    Cortes Ruiz, Maria F.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology, Fibre Technology.
    Hall, Stephen A
    KTH, School of Engineering Sciences (SCI), Engineering Mechanics, Vehicle Engineering and Solid Mechanics, Solid Mechanics.
    Larsson, Per A.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology, Fibre Technology.
    Wågberg, Lars
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology, Fibre Technology.
    Wet-resilient foams based on heat-treated β-lactoglobulin and cellulose nanofibrilsManuscript (preprint) (Other academic)
  • 58. Aubert, B.
    et al.
    Jensen, Bengt
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Lundqvist, J.
    KTH.
    Megner, L.
    KTH.
    Pearce, Mark
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Rydström, S
    KTH.
    Steffens, J.
    et al.,
    Erratum to “Performance of the ATLAS electromagnetic calorimeter barrel module 0” [Nucl. Instr. and Meth. A 500 (2003) 202–231]2004In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 517, no 1-3, p. 399-402Article in journal (Refereed)
  • 59.
    Aurell, Erik
    et al.
    KTH, School of Electrical Engineering and Computer Science (EECS), Computer Science, Computational Science and Technology (CST). AlbaNova Univ Ctr, KTH Royal Inst Technol, SE-10691 Stockholm, Sweden..
    Mulet, Roberto
    Univ Havana, Phys Fac, Dept Theoret Phys, Grp Complex Syst & Stat Phys, Havana, Cuba..
    Tuziemski, Jan
    Stockholm Univ, AlbaNova Univ Ctr, Dept Phys, SE-10691 Stockholm, Sweden.;Royal Inst Technol, NORDITA, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden.;Stockholm Univ, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden.;Gdansk Univ Technol, Dept Appl Phys & Math, PL-80233 Gdansk, Poland..
    Real-time dynamics in diluted quantum networks2022In: Physical Review A: covering atomic, molecular, and optical physics and quantum information, ISSN 2469-9926, E-ISSN 2469-9934, Vol. 105, no 2, article id 022205Article in journal (Refereed)
    Abstract [en]

    We introduce an approach to characterize the dynamics of disordered quantum networks. Each quantum element (i.e., each node) of the network experiences the other nodes as an effective environment that can be self-consistently represented by a Feynman-Vernon influence functional. For networks having the topology of locally treelike graphs, these Feynman-Vernon (FV) functionals can be determined by a new version of the cavity or belief propagation (BP) method. Here, we find the fixed point solution of this version of BP for a network of uniform quantum harmonic oscillators. Then, we estimate the effects of the disorder in these networks within the replica symmetry ansatz. We show that over a large time interval, at small disorder, the real part of the FV functional induces decoherence and classicality while at sufficiently large disorder the Feynman-Vernon functional tends to zero and the coherence survives, signaling in a time setting, the onset of an Anderson's transition.

  • 60.
    Axelsson, Karolin
    et al.
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry. KTH, School of Biotechnology (BIO).
    Konstanzer, Vera
    KTH.
    Rajarao, Gunaratna Kuttuva
    KTH, School of Biotechnology (BIO), Industrial Biotechnology.
    Terenius, Olle
    Seriot, Lisa
    KTH, School of Biotechnology (BIO).
    Nordenhem, Henrik
    Nordlander, Goran
    Borg-Karlson, Anna-Karin
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry. Tartu University, Estonia.
    Antifeedants Produced by Bacteria Associated with the Gut of the Pine Weevil Hylobius abietis2017In: Microbial Ecology, ISSN 0095-3628, E-ISSN 1432-184X, Vol. 74, no 1, p. 177-184Article in journal (Refereed)
    Abstract [en]

    The pine weevil, Hylobius abietis, is a severe forest pest insect as it feeds on newly planted conifer seedlings. To identify and develop an antifeedant could be one step towards the protection of seedlings from feeding damage by the pine weevil. With the aim to trace the origin of the antifeedants previously found in feces of the pine weevil, we investigated the culturable bacteria associated with the gut and identified the volatiles they produced. Bacterial isolates were identified by 16S ribosomal RNA gene analysis. The volatile emissions of selected bacteria, cultivated on NB media or on the grated phloem of Scots pine twigs dispersed in water, were collected and analyzed by solid-phase microextraction gas chromatography-mass spectrometry. The bacterial isolates released a variety of compounds, among others 2-methoxyphenol, 2-phenylethanol, 3-methyl-1-butanol, 1-octen-3-ol, 3-octanone, dimethyl disulfide, and dimethyl trisulfide. A strong antifeedant effect was observed by 2-phenylethanol, which could thus be a good candidate for use to protect planted conifer seedlings against feeding damage caused by H. abietis.

  • 61.
    Axelsson, Karolin
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Organic chemistry.
    Zendegi-Shiraz, Amene
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH). Ferdowsi Univ Mashhad, Dept Chem, Fac Sci, Mashhad, Razavi Khorasan, Iran..
    Swedjemark, Gunilla
    Skogforsk, Ekebo, Svalov, Sweden..
    Borg-Karlson, Anna-Karin
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Organic chemistry. Mid Sweden Univ, Dept Chem Engn, Sundsvall, Sweden..
    Zhao, Tao
    Örebro Univ, Sch Sci & Technol, SE-70182 Örebro, Sweden..
    Chemical defence responses of Norway spruce to two fungal pathogens2020In: Forest Pathology, ISSN 1437-4781, E-ISSN 1439-0329, Vol. 50, no 6, article id e12640Article in journal (Refereed)
    Abstract [en]

    Constitutive and inducible terpene production is involved in conifer resistance against insects and fungal infestations. To gain knowledge about local defence responses of Norway spruce bark against pathogens and to find potential chemical markers for resistance breeding, we inoculated the stem of 8-year-old Norway spruce (Picea abies) clonal trees with bothEndoconidiophora polonica(Ep, a common fungal pathogen associated with the spruce bark beetleIps typographus) andHeterobasidion parviporum(Hp, a severe pathogen causing root and stem rot disease). Three weeks after inoculation, the fungal-inoculated and intact bark from each tree was sampled. The terpenes in tree bark were extracted with hexane and characterized by gas chromatography-mass spectrometry (GC-MS). The two fungi induced varied terpene responses in the four spruce clones used. Three of the clones showed a 2.3-fold to 5.7-fold stronger terpene response to Hp relative to Ep inoculation, while one clone responded similarly to inoculation with the two fungal pathogens. The amount of the diterpenes thunbergol and geranyllinalool varied between the clones. The level of thunbergol was higher in both intact and fungal-inoculated bark from the less susceptible clones compared with the more susceptible clones. Geranyllinalool was present in higher amounts in the susceptible clones and is thus a possible marker for susceptibility. Our observations show that Norway spruce employs a similar chemical mechanism against the two fungal pathogens. Based on the present and earlier published data, we suggest that certain Norway spruce genotypes have a strong defence reaction against these two pathogens. The diterpenes thunbergol and geranyllinalool might be useful markers of susceptibility in tree-breeding programmes and should be the focus of further detailed investigations.

  • 62.
    Baalsrud Hauge, Jannicke
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Sustainable production development, Avancerad underhållsteknik och produktionslogistik. BIBA Bremer Inst Prod & Logist GmbH, Bremen, Germany.
    Basu, Prabahan
    BIBA Bremer Inst Prod & Logist GmbH, Bremen, Germany.;Univ Bremen, Bremen, Germany..
    Sundus, Fatima
    BIBA Bremer Inst Prod & Logist GmbH, Bremen, Germany.;Univ Bremen, Bremen, Germany..
    Chowdhury, Anindya
    BIBA Bremer Inst Prod & Logist GmbH, Bremen, Germany.;Univ Bremen, Bremen, Germany..
    Schurig, Artem
    Design of a Mixed Reality Game for Exploring How IoT Technologies Can Support the Decision Making Process2022In: Online Engineering and Society 4.0 / [ed] Auer, ME Bhimavaram, KR Yue, XG, Springer Nature , 2022, Vol. 298, p. 281-288Conference paper (Refereed)
    Abstract [en]

    There is a trend in industries towards adoption of new technologies coming from Industry 4.0 to improve logistics operations. This has also led to new requirements on engineering education. This paper presents work in progress on a mixed reality game that is intended to be used for the education on engineers and engineering students in the blended lab environments. The game itself consist of a physical and a digital component, and the focus in this article is to describe the design and prototypical implementation of the physical part and how that can be operated in a remote lab environment.

  • 63.
    Baalsrud Hauge, Jannicke
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Sustainable production development, Avancerad underhållsteknik och produktionslogistik. BIBA Bremer Inst Prod & Logist GmbH, Hochschulring 20, Bremen, Germany..
    Stefan, Ioana Andreea
    Adv Technol Syst, Str Tineretului 1, Targoviste 130029, Romania..
    Hauge, Jakob Baalsrud
    BIBA Bremer Inst Prod & Logist GmbH, Hochschulring 20, Bremen, Germany.;Hsch Fuer Tech, Stuttgart, Germany..
    Stefan, Antoniu
    KTH.
    Gheorghe, Ancuta Florentina
    KTH.
    Redesign with Accessibility in Mind: A Visual Impairment Study2021In: SERIOUS GAMES, JCSG 2021 / [ed] Fletcher, B Ma, M Gobel, S Hauge, JB Marsh, T, Springer Nature , 2021, Vol. 12945, p. 55-66Conference paper (Refereed)
    Abstract [en]

    The role of the teacher is to help students improve their knowledge and skills. While it is acknowledged that learning occurs within specific activities and contexts, the adaptation of learning settings to distinct didactical objectives and learner needs remains a challenge. Under these premises, the authors explore the demanding endeavour of creating and tailoring game-based learning activities for specific subjects. The design and personalisation of rich media applications require an extra effort on the teacher side and imply advanced skills. The paper explores the opportunity to reuse gamified lesson plans using an authoring pipeline that reunited authoring tools, game narratives and minigames.

  • 64.
    Baber, Robert
    et al.
    KTH, Centres, Science for Life Laboratory, SciLifeLab. Elvesys – Microfluidic innovation center, Paris, France.
    Banijamali, Mahsan
    KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Höjer, Pontus
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Gene Technology. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Ahmadian, Afshin
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Gene Technology. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Vigne, A.
    Development Of A Versatile And Low-Cost Droplet Microfluidic Platform For Single-Nuclei Atac-Sequencing2021In: MicroTAS 2021 - 25th International Conference on Miniaturized Systems for Chemistry and Life Sciences, Chemical and Biological Microsystems Society , 2021, p. 1767-1768Conference paper (Refereed)
    Abstract [en]

    Profiling the genome-wide chromatin accessibility via Assay for Transposase Accessible Chromatin with high-throughput sequencing (ATAC-seq) provides important insights into genome regulation that help understanding different biological processes. However, the heterogeneity of cell populations must be considered to gain a full understanding which is possible through droplet microfluidics enabling single-nuclei ATAC-seq (snATAC-seq). Droplet microfluidic platforms commonly used to perform snATAC-seq lack versatility and cannot be easily adapted to custom assay requirements. Here, we present a fully versatile, low-cost droplet microfluidic platform that can be readily adapted to run various droplet-based library preparation protocols for analyses at single-cell resolution such as snATAC-seq. 

  • 65.
    Bahri, Leila
    et al.
    KTH, School of Electrical Engineering and Computer Science (EECS), Computer Science, Software and Computer systems, SCS.
    Carminati, Barbara
    KTH, School of Electrical Engineering and Computer Science (EECS), Computer Science, Software and Computer systems, SCS.
    Ferrari, Elena
    Univ Insubria, Dept Theoret & Appl Sci, Varese, Italy..
    Knowledge-based approaches for identity management in online social networks2018In: Wiley Interdisciplinary Reviews. Data Mining and Knowledge Discovery, ISSN 1942-4787, Vol. 8, no 5, article id e1260Article, review/survey (Refereed)
    Abstract [en]

    When we meet a new person, we start by introducing ourselves. We share our names, and other information about our jobs, cities, family status, and so on. This is how socializing and social interactions can start: we first need to identify each other. Identification is a cornerstone in establishing social contacts. We identify ourselves and others by a set of civil (e.g., name, nationality, ID number, gender) and social (e.g., music taste, hobbies, religion) characteristics. This seamlessly carried out identification process in face-to-face interactions is challenged in the virtual realms of socializing, such as in online social network (OSN) platforms. New identities (i.e., online profiles) could be created without being subject to any level of verification, making it easy to create fake information and forge fake identities. This has led to a massive proliferation of accounts that represent fake identities (i.e., not mapping to physically existing entities), and that poison the online socializing environment with fake information and malicious behavior (e.g., child abuse, information stealing). Within this milieu, users in OSNs are left unarmed against the challenging task of identifying the real person behind the screen. OSN providers and research bodies have dedicated considerable effort to the study of the behavior and features of fake OSN identities, trying to find ways to detect them. Some other research initiatives have explored possible techniques to enable identity validation in OSNs. Both kinds of approach rely on extracting knowledge from the OSN, and exploiting it to achieve identification management in their realms. We provide a review of the most prominent works in the literature. We define the problem, provide a taxonomy of related attacks, and discuss the available solutions and approaches for knowledge-based identity management in OSNs. This article is categorized under: Fundamental Concepts of Data and Knowledge > Human Centricity and User Interaction Application Areas> Internet and Web-Based Applications Application Areas> Society and Culture

  • 66. Bai, Q.
    et al.
    Guo, Z.
    Cui, X.
    Yang, Xiaohu
    KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Energy Processes.
    Yanhua, L.
    Jin, L.
    Sun, Y.
    Experimental investigation on the solidification rate of water in open-cell metal foam with copper fins2018In: Energy Procedia, Elsevier Ltd , 2018, p. 210-214Conference paper (Refereed)
    Abstract [en]

    This study focused on the effect of inserting fins into metal foam on the solidification rate. To this aim, a well-designed experimental system with solid-liquid interface visualization was built. Metal foam samples with different fin intervals were prepared for experiments. Solidification process of water saturating in finned metal foam under bottom cooling was experimentally investigated. Results showed that inserting fins into metal foam can make a promotional improvement on solidification rate of water. The solid-liquid interface became curved after inserting fins, compared with metal foam sample without fins. Besides, changing the interval has little effect on the solidification rate. 

  • 67. Bai, Q.
    et al.
    Guo, Z.
    Li, H.
    Yang, Xiaohu
    KTH, School of Chemical Science and Engineering (CHE).
    Jin, L.
    Yan, Jerry
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Energy Processes.
    Experimental investigation on the solidification behavior of phase change materials in open-cell metal foams2017In: Energy Procedia, Elsevier Ltd , 2017, Vol. 142, p. 3703-3708Conference paper (Refereed)
    Abstract [en]

    This study presented an experimental investigation on solidification behavior of fluid saturated in highly porous open-cell copper foams. Particular attention has been made on the effect of pore parameters (pore density and porosity) on the solidification behavior. A purposely-designed apparatus was built for experimental observations. Results showed that the copper foam had a great effect on solidification and the full solidification time can be saved up to 50%, especially preventing the decrease in solidification rate during the later stage of phase change. The smaller the porosity is, the faster the solidification rate will be. Pore density was found to have little influence upon the solidification rate. In addition, the local natural convection does exist but it has a slight effect on solidification, leading to the slant of the solid-liquid interface.

  • 68.
    Balabanov, Oleksandr
    et al.
    Stockholm Univ, AlbaNova Univ Ctr, Dept Phys, SE-10691 Stockholm, Sweden..
    Ortega-Taberner, Carlos
    Nordita SU.
    Hermanns, Maria
    KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Department of Physics, Stockholm University, AlbaNova University Center, Stockholm, SE-106 91, Sweden.
    Quantization of topological indices in critical chains at low temperatures2022In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 106, no 4, article id 045116Article in journal (Refereed)
    Abstract [en]

    Various types of topological phenomena at criticality are currently under active research. In this paper we suggest to generalize the known topological quantities to finite temperatures, allowing us to consider gapped and critical (gapless) systems on the same footing. It is then discussed that the quantization of the topological indices, also at critically, is retrieved by taking the low-temperature limit. This idea is explicitly illustrated on a simple case study of chiral critical chains where the quantization is shown analytically and verified numerically. The formalism is also applied for studying robustness of the topological indices to various types of disordering perturbations.

  • 69.
    Balafendie, R.
    et al.
    ITMO University, School of Physics and Engineering, Saint Petersburg, Russian Federation, 191002, Lomonosova 9.
    Simovski, C.
    Aalto University, Department of Electronics and Nanoengineering, Espoo, Finland, 02150, Maarintie 8.
    Millar, Alexander J.
    KTH. Stockholm University, The Oskar Klein Centre for Cosmoparticle Physics, Department of Physics, Stockholm, Sweden, 106 91, Alfvéns vág 12.
    Belov, P.
    ITMO University, School of Physics and Engineering, Saint Petersburg, Russian Federation, 191002, Lomonosova 9.
    Wire metamaterial use for dark matter detection2022In: 2022 16th International Congress on Artificial Materials for Novel Wave Phenomena, Metamaterials 2022, Institute of Electrical and Electronics Engineers (IEEE) , 2022, p. 46-48Conference paper (Refereed)
    Abstract [en]

    In this work we present our insights into the electromagnetic properties of a resonator recently suggested for the search of axions - a hypothetical candidate to particles of dark matter. A wire medium loaded resonator called a plasma haloscope when used to search for dark matter consists of a metal box filled with a dense array of parallel wires electrically connected to top and bottom walls. We show that the resonator quality Q at the frequency of our interest drops versus the growth of the resonator volume V until it is dominated by resistive losses in the wires. However, we find that in spite of these losses even at room temperature the metal like copper offer the quality factors in the thousands, an order of magnitude higher than the quality originally assumed by the authors of the concept. We have also found a way to tune the resonant frequency so that to better match the phases of the resonator eigenmode to that of the axion. It is achieved by mechanical movement of wires in relation to each other that allows up to 30% change in the resonance frequency. Finally, we discuss how to further improve the wire medium resonators for detection of axions.

  • 70.
    Balatsky, Alexander V.
    et al.
    KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Stockholm Univ, Roslagstullbacken 23, SE-10691 Stockholm, Sweden.;Univ Connecticut, Dept Phys, Storrs, CT 06269 USA.;Univ Connecticut, Inst Mat Sci, Storrs, CT 06269 USA..
    Fraser, Benjo
    Stockholm Univ, Roslagstullbacken 23, SE-10691 Stockholm, Sweden..
    Roising, Henrik S.
    Stockholm Univ, Roslagstullbacken 23, SE-10691 Stockholm, Sweden..
    Dark sound: Collective modes of the axionic dark matter condensate2022In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 105, no 2, article id 023504Article in journal (Refereed)
    Abstract [en]

    We discuss the axion dark matter (DM) condensate and the consequences the interactions of dark matter would have on the spectrum of collective modes. We find that DM self-interactions change the spectrum of excitations from a quadratic to a linearlike dispersion with velocity upsilon(s) which is set by the interactions, but dominated by gravity. For typical DM densities and interactions we find upsilon(s) similar to 10(-12)c. This soundlike mode corresponds to DM density oscillations just like in any other Bose liquid, hence we call it dark sound (DS). The DS mode is well defined and describes stable density oscillations at intermediate length scales k >= k(min) similar to 10(4) lyr(-1). In the extreme long-wavelength limit gravity dominates and leads to Jeans instability of the sound mode at the scale of clump formation k <= k(mi)(n). We also discuss the possible observable consequences of the DS, including quantized DS modes inside clumps, their characteristic energy, and noise features that might facilitate the observation of DM.

  • 71. Balderrama, S.
    et al.
    Peña, Gabriela
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Energy Systems Analysis. San Simon University, Cochabamba, Bolivia.
    Lombardi, F.
    Stevanato, N.
    Sahlberg, Andreas
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Energy Systems Analysis.
    Howells, Mark I.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Energy Systems Analysis.
    Colombo, E.
    Quoilin, Sylvain
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Energy Systems Analysis.
    Model-base cost evaluation of microgrids systems for rural electrification and energy planning purposes2020In: Proceedings of the ISES Solar World Congress 2019 and IEA SHC International Conference on Solar Heating and Cooling for Buildings and Industry 2019, International Solar Energy Society , 2020, p. 1638-1647Conference paper (Refereed)
    Abstract [en]

    With pressing priorities in the development agenda, policy makers in developing countries are in the difficult situation of prioritizing policy actions. Limited government and utility budgets need cost effective solutions to bring the desired development benefits of electrification, health, education and food security among others. Energy access is a prerequisite for economic activity and for human development as interacts in synergy with other development needs. As rural electrification models usually focus on the supply of electricity solely, thermal energy needs, such as cooking and water heating remain unattended and satisfied by non-renewable energy fuels. To this aim, we explore optimal electrification solutions addressing two types of energy demands, electricity and thermal energy demands for cooking. Our model builds on a 3-step electrification methodology proposed by Peña et al. including electricity as a modern source of clean energy for cooking in rural communities. The total investments needed to build and operate the microgrids, including distribution costs, is 332 million USD. This is equivalent to 1129 USD/per inhabitant. This amount does not account however the health and environment benefits that e-cooking can bring to inhabitants in Bolivian low-lands.

  • 72.
    Baldini, L.
    et al.
    Univ Pisa, I-56127 Pisa, Italy.;Ist Nazl Fis Nucl, Sez Pisa, I-56127 Pisa, Italy..
    Cavazzuti, E.
    Via Politecn Snc, Italian Space Agcy, I-00133 Rome, Italy..
    Johannesson, G.
    Univ Iceland, Sci Inst, IS-107 Reykjavik, Iceland.;Royal Inst Technol, NORDITA, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden.;Stockholm Univ, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden..
    Larsson, Stefan
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics. Dalarna Univ, Sch Educ Hlth & Social Studies, Nat Sci, SE-79188 Falun, Sweden..
    Zaharijas, G.
    Ist Nazl Fis Nucl, Sez Trieste, I-34127 Trieste, Italy.;Univ Trieste, I-34127 Trieste, Italy.;Univ Nova Gorica, Ctr Astrophys & Cosmol, Nova Gorica, Slovenia..
    Catalog of Long-term Transient Sources in the First 10 yr of Fermi-LAT Data2021In: Astrophysical Journal Supplement Series, ISSN 0067-0049, E-ISSN 1538-4365, Vol. 256, no 1, article id 13Article in journal (Refereed)
    Abstract [en]

    We present the first Fermi Large Area Telescope (LAT) catalog of long-term gamma-ray transient sources (1FLT). This comprises sources that were detected on monthly time intervals during the first decade of Fermi-LAT operations. The monthly timescale allows us to identify transient and variable sources that were not yet reported in other Fermi-LAT catalogs. The monthly data sets were analyzed using a wavelet-based source detection algorithm that provided the candidate new transient sources. The search was limited to the extragalactic regions of the sky to avoid the dominance of the Galactic diffuse emission at low Galactic latitudes. The transient candidates were then analyzed using the standard Fermi-LAT maximum likelihood analysis method. All sources detected with a statistical significance above 4 sigma in at least one monthly bin were listed in the final catalog. The 1FLT catalog contains 142 transient gamma-ray sources that are not included in the 4FGL-DR2 catalog. Many of these sources (102) have been confidently associated with active galactic nuclei (AGNs): 24 are associated with flat-spectrum radio quasars, 1 with a BL Lac object, 70 with blazars of uncertain type, 3 with radio galaxies, 1 with a compact steep-spectrum radio source, 1 with a steep-spectrum radio quasar, and 2 with AGNs of other types. The remaining 40 sources have no candidate counterparts at other wavelengths. The median gamma-ray spectral index of the 1FLT-AGN sources is softer than that reported in the latest Fermi-LAT AGN general catalog. This result is consistent with the hypothesis that detection of the softest gamma-ray emitters is less efficient when the data are integrated over year-long intervals.

  • 73.
    Banijamali, Mahsan
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Gene Technology. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Höjer, Pontus
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Gene Technology. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Nagy, Abel
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Protein Science. KTH, School of Biotechnology (BIO), Centres, Albanova VinnExcellence Center for Protein Technology, ProNova.
    Haag, Petra
    Karolinska Inst, Dept Oncol Pathol, Solna, Sweden..
    Paz Gomero, Elizabeth
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Protein Science. KTH, School of Biotechnology (BIO), Centres, Albanova VinnExcellence Center for Protein Technology, ProNova.
    Stiller, Christiane
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Protein Science, Protein Engineering. KTH, School of Biotechnology (BIO), Centres, Albanova VinnExcellence Center for Protein Technology, ProNova.
    Kaminskyy, Vitaliy O.
    Karolinska Inst, Dept Oncol Pathol, Solna, Sweden.;Karolinska Inst, Dept Physiol & Pharmacol, Stockholm, Sweden..
    Ekman, Simon
    Karolinska Inst, Dept Oncol Pathol, Solna, Sweden.;Karolinska Univ Hosp, Theme Canc, Med Unit Head & Neck Lung & Skin Tumors, Thorac Oncol Ctr, Solna, Sweden..
    Lewensohn, Rolf
    Karolinska Inst, Dept Oncol Pathol, Solna, Sweden.;Karolinska Univ Hosp, Theme Canc, Med Unit Head & Neck Lung & Skin Tumors, Thorac Oncol Ctr, Solna, Sweden..
    Eriksson Karlström, Amelie
    KTH, School of Biotechnology (BIO), Centres, Albanova VinnExcellence Center for Protein Technology, ProNova. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Protein Science, Protein Engineering.
    Viktorsson, Kristina
    Karolinska Inst, Dept Oncol Pathol, Solna, Sweden..
    Ahmadian, Afshin
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Gene Technology. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Characterizing single extracellular vesicles by droplet barcode sequencing for protein analysis2022In: Journal of Extracellular Vesicles, E-ISSN 2001-3078, Vol. 11, no 11, article id 12277Article in journal (Refereed)
    Abstract [en]

    Small extracellular vesicles (sEVs) have in recent years evolved as a source of biomarkers for disease diagnosis and therapeutic follow up. sEV samples derived from multicellular organisms exhibit a high heterogeneous repertoire of vesicles which current methods based on ensemble measurements cannot capture. In this work we present droplet barcode sequencing for protein analysis (DBS-Pro) to profile surface proteins on individual sEVs, facilitating identification of sEV-subtypes within and between samples. The method allows for analysis of multiple proteins through use of DNA barcoded affinity reagents and sequencing as readout. High throughput single vesicle profiling is enabled through compartmentalization of individual sEVs in emulsion droplets followed by droplet barcoding through PCR. In this proof-of-concept study we demonstrate that DBS-Pro allows for analysis of single sEVs, with a mixing rate below 2%. A total of over 120,000 individual sEVs obtained from a NSCLC cell line and from malignant pleural effusion (MPE) fluid of NSCLC patients have been analyzed based on their surface proteins. We also show that the method enables single vesicle surface protein profiling and by extension characterization of sEV-subtypes, which is essential to identify the cellular origin of vesicles in heterogenous samples.

  • 74.
    Barbe, L.
    et al.
    KTH.
    Lundberg, E.
    KTH.
    Brismar, H.
    KTH.
    Uhlén, Mathias
    KTH.
    Andersson, H.
    KTH.
    High-throughput confocal subcellular mapping for antibody-based proteomics2006In: Molecular & Cellular Proteomics, ISSN 1535-9476, E-ISSN 1535-9484, Vol. 5, no 10, p. S240-S240Article in journal (Other academic)
  • 75.
    Bartie, Phil
    et al.
    KTH, School of Computer Science and Communication (CSC), Theoretical Computer Science, TCS. Edinburgh University.
    Mackaness, William
    Edinburgh University.
    Minock, Michael
    KTH, School of Computer Science and Communication (CSC), Theoretical Computer Science, TCS.
    Mollevik, Johan
    Umeå University.
    SpaceBook D3.3.2: Final Populated City Model Component2013Report (Other academic)
  • 76.
    Bartlett, D. J.
    et al.
    Univ Oxford, Astrophys, Denys Wilkinson Bldg,Keble Rd, Oxford OX1 3RH, England..
    Bergsdal, D.
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics. Stockholm Univ, AlbaNova Univ Ctr, Oskar Klein Ctr, Dept Phys, SE-10691 Stockholm, Sweden..
    Desmond, H.
    Univ Oxford, Astrophys, Denys Wilkinson Bldg,Keble Rd, Oxford OX1 3RH, England..
    Ferreira, P. G.
    Univ Oxford, Astrophys, Denys Wilkinson Bldg,Keble Rd, Oxford OX1 3RH, England..
    Jasche, J.
    Stockholm Univ, AlbaNova Univ Ctr, Oskar Klein Ctr, Dept Phys, SE-10691 Stockholm, Sweden..
    Constraints on equivalence principle violation from gamma ray bursts2021In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 104, no 8, article id 084025Article in journal (Refereed)
    Abstract [en]

    Theories of gravity that obey the weak equivalence principle have the same parametrized post-Newtonian parameter gamma for all particles at all energies. The large Shapiro time delays of extragalactic sources allow us to put tight constraints on differences in gamma between photons of different frequencies from spectral lag data, since a nonzero Delta gamma would result in a frequency-dependent arrival time. The majority of previous constraints have assumed that the Shapiro time delay is dominated by a few local massive objects, although this is a poor approximation for distant sources. In this work we consider the cosmological context of these sources by developing a source-by-source, Monte Carlo-based forward model for the Shapiro time delays by combining constrained realizations of the local density field using the Bayesian origin reconstruction from galaxies algorithm with unconstrained large-scale modes. Propagating uncertainties in the density field reconstruction and marginalizing over an empirical model describing other contributions to the time delay, we use spectral lag data of gamma ray bursts from the BATSE satellite to constrain Delta gamma < 2.1 x 10(-15) at 1 sigma confidence between photon energies of 25 keV and 325 keV.

  • 77.
    Batini, Laura
    et al.
    Institut für Theoretische Physik, Universität Heidelberg, Philosophenweg 16, 69120 Heidelberg, Germany, Philosophenweg 16.
    Chatrchyan, Aleksandr
    Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany, Notkestr. 85; Nordita, Stockholm University .
    Berges, Jürgen
    Institut für Theoretische Physik, Universität Heidelberg, Philosophenweg 16, 69120 Heidelberg, Germany, Philosophenweg 16.
    Real-time dynamics of false vacuum decay2024In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 109, no 2, article id 023502Article in journal (Refereed)
    Abstract [en]

    We investigate false vacuum decay of a relativistic scalar field initialized in the metastable minimum of an asymmetric double-well potential. The transition to the true ground state is a well-defined initial-value problem in real time, which can be formulated in nonequilibrium quantum field theory on a closed time path. We employ the nonperturbative framework of the two-particle irreducible (2PI) quantum effective action at next-to-leading order in a large-N expansion. We also compare to classical-statistical field theory simulations on a lattice in the high-temperature regime. By this, we demonstrate that the real-time decay rates are comparable to those obtained from the conventional Euclidean (bounce) approach. In general, we find that the decay rates are time dependent. For a more comprehensive description of the dynamics, we extract a time-dependent effective potential, which becomes convex during the nonequilibrium transition process. By solving the quantum evolution equations for the one- and two-point correlation functions for vacuum initial conditions, we demonstrate that quantum corrections can lead to transitions that are not captured by classical-statistical approximations.

  • 78.
    Battisti, Umberto Maria
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Protein Science, Nano Biotechnology. KTH, Centres, Science for Life Laboratory, SciLifeLab. Univ Gothenburg, Dept Chem & Mol Biol, SE-41296 Gothenburg, Sweden..
    Monjas, Leticia
    KTH, Centres, Science for Life Laboratory, SciLifeLab. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Protein Science, Systems Biology. Univ Gothenburg, Dept Chem & Mol Biol, SE-41296 Gothenburg, Sweden..
    Akladios, Fady
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Protein Science, Nano Biotechnology. KTH, Centres, Science for Life Laboratory, SciLifeLab. Univ Gothenburg, Dept Chem & Mol Biol, SE-41296 Gothenburg, Sweden..
    Matic, Josipa
    KTH, Centres, Science for Life Laboratory, SciLifeLab. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH). Univ Gothenburg, Dept Chem & Mol Biol, SE-41296 Gothenburg, Sweden..
    Andresen, Eric
    Univ Gothenburg, Dept Chem & Mol Biol, SE-41296 Gothenburg, Sweden..
    Nagel, Carolin H.
    Univ Gothenburg, Dept Chem & Mol Biol, SE-41296 Gothenburg, Sweden..
    Hagkvist, Malin
    Univ Gothenburg, Dept Chem & Mol Biol, SE-41296 Gothenburg, Sweden..
    Haversen, Liliana
    Univ Gothenburg, Dept Mol & Clin Med, SE-41345 Gothenburg, Sweden.;Sahlgrens Univ Hosp, SE-41345 Gothenburg, Sweden..
    Kim, Woonghee
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Protein Science, Systems Biology. KTH, Centres, Science for Life Laboratory, SciLifeLab.
    Uhlén, Mathias
    KTH, Centres, Science for Life Laboratory, SciLifeLab. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Protein Science, Systems Biology.
    Boren, Jan
    Univ Gothenburg, Dept Mol & Clin Med, SE-41345 Gothenburg, Sweden.;Sahlgrens Univ Hosp, SE-41345 Gothenburg, Sweden..
    Mardinoglu, Adil
    KTH, Centres, Science for Life Laboratory, SciLifeLab. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Protein Science, Systems Biology. Kings Coll London, Fac Dent Oral & Craniofacial Sci, Ctr Host Microbiome Interact, London SE1 9RT, England..
    Grotli, Morten
    Univ Gothenburg, Dept Chem & Mol Biol, SE-41296 Gothenburg, Sweden..
    Exploration of Novel Urolithin C Derivatives as Non-Competitive Inhibitors of Liver Pyruvate Kinase2023In: Pharmaceuticals, E-ISSN 1424-8247, Vol. 16, no 5, article id 668Article in journal (Refereed)
    Abstract [en]

    The inhibition of liver pyruvate kinase could be beneficial to halt or reverse non-alcoholic fatty liver disease (NAFLD), a progressive accumulation of fat in the liver that can lead eventually to cirrhosis. Recently, urolithin C has been reported as a new scaffold for the development of allosteric inhibitors of liver pyruvate kinase (PKL). In this work, a comprehensive structure-activity analysis of urolithin C was carried out. More than 50 analogues were synthesized and tested regarding the chemical features responsible for the desired activity. These data could pave the way to the development of more potent and selective PKL allosteric inhibitors.

  • 79.
    Baudry, Benoit
    et al.
    KTH, School of Electrical Engineering and Computer Science (EECS), Computer Science, Software and Computer systems, SCS.
    Toady, Tim
    KTH.
    Monperrus, Martin
    KTH, School of Electrical Engineering and Computer Science (EECS), Computer Science, Theoretical Computer Science, TCS.
    Long Live Software Easter Eggs!2022In: Queue, ISSN 1542-7730, Vol. 20, no 2, p. 31-42Article in journal (Refereed)
    Abstract [en]

    It's a period of unrest. Rebel developers, striking from continuous deployment servers, have won their first victory. During the battle, rebel spies managed to push an epic commit in the HTML code of https://pro.sony. Pursued by sinister agents, the rebels are hiding in commits, buttons, tooltips, API, HTTP headers, and configuration screens. 

  • 80.
    Beal, Jacob
    et al.
    Raytheon BBN Technologies, Cambridge, MA, USA.
    Garcia, Chrismar
    KTH. KTH Royal institute of Technology, Stockholm, Sweden; Karolinska Institutet, Solna, Stockholm, Sweden; Konstfack, Stockholm, Sweden.
    Rentouli, Stamatina
    KTH Royal institute of Technology, Stockholm, Sweden; Karolinska Institutet, Solna, Stockholm, Sweden; Konstfack, Stockholm, Sweden.
    Zhou, Jiajie
    Zhejiang University of Technology, Hangzhou, China.
    et al.,
    Robust estimation of bacterial cell count from optical density2020In: Communications Biology, E-ISSN 2399-3642, Vol. 3, no 1, article id 512Article in journal (Refereed)
    Abstract [en]

    Optical density (OD) is widely used to estimate the density of cells in liquid culture, but cannot be compared between instruments without a standardized calibration protocol and is challenging to relate to actual cell count. We address this with an interlaboratory study comparing three simple, low-cost, and highly accessible OD calibration protocols across 244 laboratories, applied to eight strains of constitutive GFP-expressing E. coli. Based on our results, we recommend calibrating OD to estimated cell count using serial dilution of silica microspheres, which produces highly precise calibration (95.5% of residuals <1.2-fold), is easily assessed for quality control, also assesses instrument effective linear range, and can be combined with fluorescence calibration to obtain units of Molecules of Equivalent Fluorescein (MEFL) per cell, allowing direct comparison and data fusion with flow cytometry measurements: in our study, fluorescence per cell measurements showed only a 1.07-fold mean difference between plate reader and flow cytometry data.

  • 81. Becker, M.
    et al.
    Nilsson, D.
    KTH.
    Wackers, P.
    Werner, A.
    Arrieta, V.
    An Approach to Energy Based Fretting Wear Prediction at Low Frequency Loading2011In: Friction, Wear and Wear Protection: International Symposium on Friction, Wear and Wear Protection 2008 Aachen, Germany, Wiley , 2011, p. 314-320Chapter in book (Other academic)
  • 82.
    Beerten, Jef
    et al.
    KTH. University of Leuven (KU Leuven), Belgium; Norwegian University of Science and Technology (NTNU), Trondheim, Norway.
    Davidson, C.
    Sanjeevikumar, P.
    Van Hertem, D.
    Zhang, X. -P
    Zhou, K.
    Guest editorial2016In: IET Generation, Transmission & Distribution, ISSN 1751-8687, E-ISSN 1751-8695, Vol. 10, no 6, p. 1313-1314Article in journal (Refereed)
  • 83.
    Begovic, Ermina
    et al.
    University of Naples Federico II, Department of Industrial Engineering, Napoli, Italy.
    Bertorello, Carlo
    University of Naples Federico II, Department of Industrial Engineering, Napoli, Italy.
    Bove, Andrea
    University of Naples Federico II, Department of Industrial Engineering, Napoli, Italy.
    Garme, Karl
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
    Lei, Xiangyu
    KTH.
    Persson, Jonas
    KTH.
    Petrone, Giuseppe
    University of Naples Federico II, Department of Industrial Engineering, Napoli, Italy.
    Razola, Mikael
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
    Rosén, Anders
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
    Experimental modelling of local structure responses for high-speed planing craft in waves2020In: Ocean Engineering, ISSN 0029-8018, E-ISSN 1873-5258, Vol. 216, article id 107986Article in journal (Refereed)
    Abstract [en]

    The modelling of planing craft dynamics in waves and related fluid-structure interaction is a hard challenge due to the highly nonlinear, transient and stochastic nature of the whole process. This paper explores the prospectives of detailed experimental modelling of the local structure responses for high-speed planing craft in waves. A novel experimental setup is presented where a well-defined model structure is integrated into the hull bottom of a typical planing craft model. The model is instrumented for measuring strains in the model structure, related slamming pressures, craft rigid body motions and accelerations. The experimental setup is thoroughly described and motivated and crucial aspects of the setup are verified through testing in idealized static loading conditions and by modal analysis. The capabilities of the experimental setup are demonstrated through systematic experiments in regular waves. The most indicative results are presented and discussed in relation to corresponding results from time-domain simulations The presented experimental modelling approach is concluded to enable uniquely detailed studies of the complete slamming related fluid-structure interaction process and provides a good tool for further research and development towards establishment of first principles-based methods for hydrodynamic and structure design of high-speed planing craft.

  • 84.
    Behi, Mohammadreza
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
    Shakorian-poor, M.
    Mirmohammadi, Seyed Aliakbar
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
    Behi, H.
    Rubio, J. I.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
    Nikkam, N.
    Farzaneh-Gord, M.
    Gan, Y.
    Behnia, M.
    Experimental and numerical investigation on hydrothermal performance of nanofluids in micro-tubes2020In: Energy, ISSN 0360-5442, E-ISSN 1873-6785, Vol. 193, article id 116658Article in journal (Refereed)
    Abstract [en]

    Nanoscale solid particles suspended in a base liquid are a new class of nano-engineered colloidal suspension, defined with a coined name of nanofluids (NFs). The effect of dispersing nanoparticles (NPs) on the hydraulic and thermal (hydrothermal) performance of the conventional coolants is a matter of importance in many applications. This work experimentally and numerically presents the effect of different parameters, including the concentration and size of the NPs, on two primary parameters, namely heat transfer coefficient and friction factor in a microtube. The numerical modeling of colloidal suspensions was conducted based on single-phase as well as Eulerian-Mixture two-phase approaches and showed a good agreement with experimental results. The numerical results displayed that the suspended NPs remarkably increased the convective heat transfer coefficient as well as friction factor by as much as 42% and 22% (in NP concentration range of 1%–9%, and NP size range of 13–130 nm and Reynolds number of 400) respectively. Besides, two new correlations were developed based on the results obtained from experimentally validated models to predict the hydrothermal response of NFs in the laminar regime. Moreover, correlations were successfully created to predict the Nusselt number and friction factor of nanofluids, with ±8% and ±5% agreement between numerical data and predictions, respectively.

  • 85.
    Behroozi Kohlan, Taha
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology, Polymer Technology.
    Wen, Yanru
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.
    Mini, Carina
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.
    Finne Wistrand, Anna
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology, Polymer Technology.
    Schiff base crosslinked hyaluronic acid hydrogels with tunable and cell instructive time-dependent mechanical properties2024In: Carbohydrate Polymers, ISSN 0144-8617, E-ISSN 1879-1344, Vol. 338, article id 122173Article in journal (Refereed)
    Abstract [en]

    The dynamic interplay between cells and their native extracellular matrix (ECM) influences cellular behavior, imposing a challenge in biomaterial design. Dynamic covalent hydrogels are viscoelastic and show self-healing ability, making them a potential scaffold for recapitulating native ECM properties. We aimed to implement kinetically and thermodynamically distinct crosslinkers to prepare self-healing dynamic hydrogels to explore the arising properties and their effects on cellular behavior. To do so, aldehyde-substituted hyaluronic acid (HA) was synthesized to generate imine, hydrazone, and oxime crosslinked dynamic covalent hydrogels. Differences in equilibrium constants of these bonds yielded distinct properties including stiffness, stress relaxation, and self-healing ability. The effects of degree of substitution (DS), polymer concentration, crosslinker to aldehyde ratio, and crosslinker functionality on hydrogel properties were evaluated. The self-healing ability of hydrogels was investigated on samples of the same and different crosslinkers and DS to obtain hydrogels with gradient properties. Subsequently, human dermal fibroblasts were cultured in 2D and 3D to assess the cellular response considering the dynamic properties of the hydrogels. Moreover, assessing cell spreading and morphology on hydrogels having similar modulus but different stress relaxation rates showed the effects of matrix viscoelasticity with higher cell spreading in slower relaxing hydrogels.

  • 86.
    Beldowski, Piotr
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Engineering Pedagogics. Bydgoszcz Univ Sci & Technol, Inst Math & Phys, Fac Chem Technol & Engn, PL-85796 Bydgoszcz, Poland..
    Przybylek, Maciej
    Nicolaus Copernicus Univ Torun, Coll Med Bydgoszcz, Pharm Fac, Dept Phys Chem, Kurpinskiego 5, PL-85950 Bydgoszcz, Poland..
    Raczynski, Przemyslaw
    Univ Silesia Katowice, Fac Sci & Technol, 75 Pulku Piechoty 1A, PL-41500 Chorzow, Poland..
    Dédinaité, Andra
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Surface and Corrosion Science. RISE Res Inst Sweden, Div Biosci & Mat, SE-11486 Stockholm, Sweden..
    Gorny, Krzysztof
    Univ Silesia Katowice, Fac Sci & Technol, 75 Pulku Piechoty 1A, PL-41500 Chorzow, Poland..
    Wieland, Florian
    Helmholtz Zentrum Hereon, Inst metall Biomat, Max Planck Str 1, D-21502 Geesthacht, Germany..
    Dendzik, Zbigniew
    Univ Silesia Katowice, Fac Sci & Technol, 75 Pulku Piechoty 1A, PL-41500 Chorzow, Poland..
    Sionkowska, Alina
    Nicolaus Copernicus Univ Torun, Fac Chem, Dept Biomat & Cosmet Chem, Gagarin 7, PL-87100 Torun, Poland..
    Claesson, Per M.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Surface and Corrosion Science.
    Albumin-Hyaluronan Interactions: Influence of Ionic Composition Probed by Molecular Dynamics2021In: International Journal of Molecular Sciences, ISSN 1661-6596, E-ISSN 1422-0067, Vol. 22, no 22, article id 12360Article in journal (Refereed)
    Abstract [en]

    The lubrication mechanism in synovial fluid and joints is not yet fully understood. Nevertheless, intermolecular interactions between various neutral and ionic species including large macromolecular systems and simple inorganic ions are the key to understanding the excellent lubrication performance. An important tool for characterizing the intermolecular forces and their structural consequences is molecular dynamics. Albumin is one of the major components in synovial fluid. Its electrostatic properties, including the ability to form molecular complexes, are closely related to pH, solvation, and the presence of ions. In the context of synovial fluid, it is relevant to describe the possible interactions between albumin and hyaluronate, taking into account solution composition effects. In this study, the influence of Na+, Mg2+, and Ca2+ ions on human serum albumin-hyaluronan interactions were examined using molecular dynamics tools. It was established that the presence of divalent cations, and especially Ca2+, contributes mostly to the increase of the affinity between hyaluronan and albumin, which is associated with charge compensation in negatively charged hyaluronan and albumin. Furthermore, the most probable binding sites were structurally and energetically characterized. The indicated moieties exhibit a locally positive charge which enables hyaluronate binding (direct and water mediated).

  • 87.
    Bemporad, Alberto
    et al.
    Univ Siena, Fac Engn, Dept Informat Engn, I-53100 Siena, Italy..
    Di Cairano, Stefano
    Univ Siena, Fac Engn, Dept Informat Engn, I-53100 Siena, Italy..
    Henriksson, Erik
    KTH, School of Electrical Engineering (EES), Automatic Control.
    Johansson, Karl H.
    KTH, School of Electrical Engineering (EES), Automatic Control.
    Hybrid model predictive control based on wireless sensor feedback: An experimental study2007In: PROCEEDINGS OF THE 46TH IEEE CONFERENCE ON DECISION AND CONTROL, VOLS 1-14, IEEE , 2007, p. 5583-+Conference paper (Refereed)
    Abstract [en]

    This paper presents the design and the experimental validation of model predictive control (MPC) of a hybrid dynamical process based on measurements collected by a wireless sensor network. The proposed setup is the prototype of an industrial application in which a remote station controls the process via wireless network links. The experimental platform is a laboratory process consisting of four infrared lamps, controlled in pairs by two on/off switches, and of a transport belt, where moving parts equipped with wireless sensors are heated by the lamps. By approximating the stationary heat spatial distribution as a piecewise affine function of the position along the belt, the resulting plant model is a hybrid dynamical system. The control architecture is based on the reference governor approach: the process is actuated by a local controller, while a hybrid MPC algorithm running on a remote base station sends optimal belt velocity set-points and lamp on/off commands over a network link exploiting the information received through the wireless network. A discrete-time hybrid model of the process is used for the hybrid MPC algorithm and for the state estimator.

  • 88.
    Bensadón, T.
    et al.
    Barcelona Supercomputing Center, Barcelona, Spain.
    Mantsinen, M.
    Barcelona Supercomputing Center, Barcelona, Spain; Catalan Institution for Research and Advanced Studies (ICREA), Barcelona, Spain.
    Manyer, J.
    Barcelona Supercomputing Center, Barcelona, Spain.
    Jonsson, Thomas
    KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Fusion Plasma Physics.
    Yadykin, Dimitriy
    KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Fusion Plasma Physics. University of Gothenburg, Sweden.
    Analysis of ITER performance with different heating schemes using predictive integrated plasma modelling2022In: 48th EPS Conference on Plasma Physics, EPS 2022, European Physical Society (EPS) , 2022Conference paper (Refereed)
  • 89.
    Bergenstrahle, Malin
    et al.
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
    Berglund, Lars
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.
    Mazeau, Karim
    CNRS, Ctr Rech Macromol Vegetales, F-38041 Grenoble, France..
    CARB 18-Thermal response in crystalline cellulose: A molecular dynamics study2008In: Abstracts of Papers of the American Chemical Society, ISSN 0065-7727, Vol. 235Article in journal (Other academic)
  • 90.
    Berglund, Lars
    et al.
    KTH, School of Biotechnology (BIO).
    Jonasson, K.
    KTH, School of Biotechnology (BIO).
    Uhlén, Mathias
    KTH, School of Biotechnology (BIO). Royal Inst Technol, Sch Biotechnol, Stockholm, Sweden..
    Antibodypedia-towards a user community for antibody validation data2009In: New Biotechnology, ISSN 1871-6784, E-ISSN 1876-4347, Vol. 25, p. S360-S361Article in journal (Other academic)
  • 91.
    Berglund, Lars
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.
    Li, Yuanyuan
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.
    Fu, Qiliang
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.
    Popov, Sergei
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Sychugov, Ilya
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Yang, Min
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Modification of transparent wood for photonics functions2018In: Abstracts of Papers of the American Chemical Society, ISSN 0065-7727, Vol. 255Article in journal (Other academic)
  • 92.
    Berglund, S
    et al.
    KTH.
    Malmstrom, M E
    KTH.
    Jarsjo, J
    Destouni, G
    Modelling field-scale dispersion in heterogeneous groundwater systems with multi-component reactions2004In: Geochimica et Cosmochimica Acta, ISSN 0016-7037, E-ISSN 1872-9533, Vol. 68, no 11, p. A456-A456Article in journal (Other academic)
  • 93. Bergman, Jan
    et al.
    Carlsson, Rene
    KTH.
    Synthesis of the indole alkaloid ellipticine2011In: Tetrahedron Letters, ISSN 0040-4039, E-ISSN 1359-8562, Vol. 52, p. 4663-4666Article in journal (Refereed)
  • 94.
    Bernardo, Carmela
    et al.
    Division of Automatic Control, Department of Electrical Engineering, Linköping University, SE-58183 Linköping, Sweden.
    Wang, Lingfei
    KTH, School of Electrical Engineering and Computer Science (EECS), Intelligent systems, Decision and Control Systems (Automatic Control).
    Fridahl, Mathias
    Department of Thematic Studies - Environmental Change, Linköping University, SE-58183 Linköping, Sweden.
    Altafini, Claudio
    Division of Automatic Control, Department of Electrical Engineering, Linköping University, SE-58183 Linköping, Sweden.
    Quantifying leadership in climate negotiations: A social power game2023In: PNAS Nexus, E-ISSN 2752-6542, Vol. 2, no 11, article id pgad365Article in journal (Refereed)
    Abstract [en]

    We consider complex multistage multiagent negotiation processes such as those occurring at climate conferences and ask ourselves how can an agent maximize its social power, intended as influence over the outcome of the negotiation. This question can be framed as a strategic game played over an opinion dynamics model, in which the action of an agent consists in stubbornly defending its own opinion. We show that for consensus-seeking opinion dynamics models in which the interaction weights are uniform, the optimal action obeys to an early mover advantage principle, i.e. the agents behaving stubbornly in the early phases of the negotiations achieve the highest social power. When looking at data collected from the climate change negotiations going on at the United Nations Framework Convention on Climate Change, we find evidence of the use of the early mover strategy. Furthermore, we show that the social powers computed through our model correlate very well with the perceived leadership roles assessed through independent survey data, especially when non-uniform weights incorporating economical and demographic factors are considered.

  • 95.
    Bertaina, M.
    et al.
    Univ Torino, Dipartimento Fis, Turin, Italy.;INFN, Sez Torino, Turin, Italy..
    Bianciotto, M.
    KTH. Univ Torino, Dipartimento Fis, Turin, Italy..
    Bolmgren, Karl
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Fuglesang, Christer
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Zotov, M.
    Lomonosov Moscow State Univ, Skobeltsyn Inst Nucl Phys, Moscow, Russia..
    Description and performance results of the trigger logic of TUS and Mini-EUSO to search for Ultra-High Energy Cosmic Rays from space2023In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 1045, article id 167601Article in journal (Refereed)
    Abstract [en]

    The Trigger Logic (TL) of the Tracking Ultraviolet Setup (TUS) and Multiwavelength Imaging New Instrument for the Extreme Universe Space Observatory (Mini-EUSO) space-based projects of the Joint Experiment Missions-EUSO (JEM-EUSO) program is summarized. The performance results on the search for Ultra-High Energy Cosmic Rays (UHECRs) are presented.

  • 96.
    Bhadoria, Shubhangi
    et al.
    KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Electric Power and Energy Systems.
    G S, Soundhariya
    KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Electric Power and Energy Systems.
    Nee, Hans-Peter
    KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Electric Power and Energy Systems.
    Comparison of Top and Bottom Cooling for Short Duration of Over-Currents for SiC Devices: An Analysis of the Quantity and Location of Heat-Absorbing Materials2024In: IEEE Open Journal of Power Electronics, E-ISSN 2644-1314, p. 1-15Article in journal (Refereed)
    Abstract [en]

    The fault clearance time in the power system can vary from a few milliseconds to a few hundred milliseconds. Power electronics converters should be able to provide the increased current during faults without failing due to thermal limits. Hence, the heat generated in the semiconductor chip due to the over-current (OC) should be removed as soon as it is generated. In this paper, cooling by heat-absorbing material has been investigated on the top, bottom, and top + bottom of the SiC MOSFET chip using COMSOL simulations for OCs. The heat-absorbing materials considered in the paper are copper, graphite, and aluminum. The maximum allowed chip temperature is assumed to be 250 ˆC since SiC devices do not fail in this range of temperature. It is concluded that the cooling on the top of the chip has the best performance among the three arrangements discussed in the paper in terms of OC duration and steady-state temperature. Another conclusion is that copper has the best performance due to higher thermal capacity for the same volume of the heat-absorbing material.

  • 97.
    Bhalla, Pankaj
    et al.
    Department of Physics, School of Engineering and Sciences, SRM University AP, Amaravati 522240, India.
    Rostami, Habib
    Department of Physics, University of Bath, Claverton Down, Bath BA2 7AY, United Kingdom, Claverton Down; Nordita, Stockholm University, Hannes Alfvéns väg 12, 10691 Stockholm, Sweden, Hannes Alfvéns väg 12.
    Light-induced nonlinear spin Hall current in single-layer WTe<inf>2</inf>2024In: New Journal of Physics, E-ISSN 1367-2630, Vol. 26, no 2, article id 023042Article in journal (Refereed)
    Abstract [en]

    In this theoretical investigation, we analyze light-induced nonlinear spin Hall currents in a gated single-layer 1T ′ -WTe2, flowing transversely to the incident laser polarization direction. Our study encompasses the exploration of the second and third-order rectified spin Hall currents using an effective low-energy Hamiltonian and employing the Kubo’s formalism. We extend our analysis to a wide frequency range spanning both transparent and absorbing regimes, investigating the influence of light frequency below and above the optical band gap. Additionally, we investigate the influence of an out-of-plane gate potential on the system, disrupting inversion symmetry and effectively manipulating both the strength and sign of nonlinear spin Hall responses. We predict a pronounced third-order spin Hall current relative to its second-order counterpart. The predicted nonlinear spin currents show strong anisotropic dependence on the laser polarization angle. The outcomes of our study contribute to a generalized framework for nonlinear response theory within the spin channel will impact the development of emerging field of opto-spintronic.

  • 98.
    Bhatia, M.
    KTH. Chandigarh College of Architecture, India.
    Colour of reflected light: A determinant of sustainable spatial function2022In: IOP Conference Series: Earth and Environmental Science, IOP Publishing , 2022, Vol. 1099, no 1, p. 012030-, article id 012030Conference paper (Refereed)
    Abstract [en]

    According to the works of W.R. Ott, we are an 'indoor species', spending on an average, 87% of our time in closed environments [1]. Our long interaction with indoor surroundings, creates the need for such spaces to be sustainable, bringing factors affecting user behaviour and consequent usage patterns under the microscope. This is an empirical study investigating if reflected light carries a component of colour taken from pigmented surfaces and if this colour of reflected light has any influence on usability of a space and its user pattern. The study is conducted in domestic interior environments of a student housing in Stockholm under artificial light conditions that were static and constant. The period of study was limited to weekends to observe the user behaviour in conditions of free will. It is a comparative analysis between two dining spaces having identical architectural and lighting attributes, with colour of walls as the only change in the two study sets. There were two separate user groups of similar age groups, similar needs and similar time schedule. The study includes four stages of observation and data gathering by adopting qualitative and quantitative methodologies. The effects of colour on the perception of space and light and hence usability of the two spaces cannot be negated completely, even if more study is needed to prove the same. The results can be used to question the photometric instruments in their inability to detect such aspects of reflected light. This also helps to underline the need for involvement of a qualified lighting designer in the making of spaces from the beginning till the end for interpreting the effects of the interactions between light and pigmented surfaces. The findings may be considered a stimulus for developing a set of standards for colour and coloured reflected light in a given environment as a measurable parameter of light for sustained usage of indoor environments.

  • 99.
    Bhatia, M.
    KTH. Chandigarh College of Architecture, India.
    Light festivals: Entertainment or urban renewal tool?2022In: IOP Conference Series: Earth and Environmental Science, IOP Publishing , 2022, Vol. 1099, no 1, p. 012009-, article id 012009Conference paper (Refereed)
    Abstract [en]

    This paper is part of the author's thesis wherein she attempted to investigate the hypothesis that a light festival is not only an entertainment based light show but could also be a sustainable renewal strategy for dead urban spaces. 'Public space is our open-air living room' [1], where people meet, interact and replenish their body and mind away from work and home. However, due to various reasons, the current pandemic being one of them, has led to the present generation being seen as an indoor generation [2]. As a result, while a lot of urban spaces are tending to be 'abandoned and left areas that have lost their function' [3]. The author's thesis is a qualitative study to check the feasibility of light festivals as a sustainable strategy to tackle the lifelessness of such dead urban spaces. This paper in particular, presents a qualitative case study of 4 light festivals. This was achieved through both primary sources in the form of personal interviews with organisers and systematic online desk study of the secondary sources of information available as reports by various national and international agencies, journals and peer reviewed papers published by researchers in various online journals of lighting and architecture. These festivals were chosen on the basis of their initial intentions of inception to match the impetus for this study. The success of the festivals is studied with respect to achievement of initial objectives. These are then qualitatively analysed under the categories of image regeneration, revenue generation and job generation to assess the holistic impact of light festivals at various locations in the world. The results of the study suggest that light festivals add playfulness and a sense of identity to public urban scape. The interventions, being temporary in nature, may disappear, but the memory of the event remains in collective memory. Through this, light festivals could potentially transform the views of inhabitants, so that they in turn, can transform their public spaces. The study also suggests that light festivals can be be socially and economically profitable. In conclusion, a light festival could be a successful contender as a sustainable urban renewal strategy.

  • 100.
    Bhattacharya, Prosun
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering.
    Hossain, Mohammed Mojahidul
    KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering.
    Jacks, Gunnar
    KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering.
    Matin Ahmed, K.
    Hasan, M. A.
    Von Brömssen, M.
    Frape, S. K.
    Hydrogeochemical contrasts across the multi-level aquifers of Bengal basin in Matlab, Bangladesh: Implications for arsenic free and low-manganese drinking water sources2016In: Arsenic Research and Global Sustainability - Proceedings of the 6th International Congress on Arsenic in the Environment, AS 2016, CRC Press/Balkema , 2016, p. 45-46Conference paper (Refereed)
    Abstract [en]

    Targeting shallow, intermediate-deep and deep aquifers, piezometers nests were installed at 15 locations in the Matlab region, an As hotspot in southeastern Bangladesh. Groundwater levels and water quality were monitored for over a three years period. Stable isotopic composition was used to identify the hydrogeological characteristics of different aquifers, hydraulic connectivity between the contaminated and safe aquifers. Within the shallow depth (up to 100m), two aquifers (Aquifer-1 and Aquifer-2) were identified, and groundwater from Aquifer-1 indicated consistently high As concentration was found to be As-enriched (median As levels upto 714 μg/L). Considerable variability in As concentrations were observed in Aquifer-2 wells (6–30 μg/L) comprising relatively oxidized or less reduced red and off-white sands. The intermediate-deep and deep aquifers were found to contain very low As concentration and these aquifers are hydraulically separated from the shallow aquifers. Groundwater depth and elevation and stable isotope signatures also reflect that intermediate-deep and deep aquifers, in most places belong to the same hydrostratigraphic unit (Aquifer-3).

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