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Takáčová K, Künzel K, Papež V, Konrád P, Mára M, Fornůsek J, Kheml P, Sovják R. Applicability of magnetic field for directed orientation of steel fibres in high-performing cementitious composites. Int J CMEM 2022. [DOI: 10.2495/cmem-v10-n2-131-145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
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Nováková K, Carrera K, Konrád P, Künzel K, Papež V, Sovják R. Simulations of the Behaviour of Steel Ferromagnetic Fibres Commonly Used in Concrete in a Magnetic Field. Materials (Basel) 2021; 15:128. [PMID: 35009279 PMCID: PMC8745836 DOI: 10.3390/ma15010128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Revised: 12/15/2021] [Accepted: 12/21/2021] [Indexed: 06/14/2023]
Abstract
The efficiency of fibre reinforcement in concrete can be drastically increased by orienting the fibres using a magnetic field. This orientation occurs immediately after pouring fresh concrete when the fibres can still move. The technique is most relevant for manufacturing prefabricated elements such as beams or columns. However, the parameters of such a field are not immediately apparent, as they depend on the specific fibre reaction to the magnetic field. In this study, a numerical model was created in ANSYS Maxwell to examine the mechanical torque acting on fibres placed in a magnetic field with varying parameters. The model consists of a single fibre placed between two Helmholtz coils. The simulations were verified with an experimental setup as well as theoretical relationships. Ten different fibre types, both straight and hook-ended, were examined. The developed model can be successfully used to study the behaviour of fibres in a magnetic field. The fibre size plays the most important role together with the magnetic saturation of the fibre material. Multiple fibres show significant interactions.
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Affiliation(s)
- Kateřina Nováková
- Department of Electrotechnology, Faculty of Electrical Engineering, Czech Technical University in Prague, Technická 2, 166 27 Prague, Czech Republic; (K.N.); (K.K.); (V.P.)
| | - Kristýna Carrera
- Experimental Centre, Faculty of Civil Engineering, Czech Technical University in Prague, Thákurova 7, 166 29 Prague, Czech Republic; (K.C.); (R.S.)
| | - Petr Konrád
- Experimental Centre, Faculty of Civil Engineering, Czech Technical University in Prague, Thákurova 7, 166 29 Prague, Czech Republic; (K.C.); (R.S.)
| | - Karel Künzel
- Department of Electrotechnology, Faculty of Electrical Engineering, Czech Technical University in Prague, Technická 2, 166 27 Prague, Czech Republic; (K.N.); (K.K.); (V.P.)
| | - Václav Papež
- Department of Electrotechnology, Faculty of Electrical Engineering, Czech Technical University in Prague, Technická 2, 166 27 Prague, Czech Republic; (K.N.); (K.K.); (V.P.)
| | - Radoslav Sovják
- Experimental Centre, Faculty of Civil Engineering, Czech Technical University in Prague, Thákurova 7, 166 29 Prague, Czech Republic; (K.C.); (R.S.)
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Künzel K, Papež V, Carrera K, Konrád P, Mára M, Kheml P, Sovják R. Electromagnetic Properties of Steel Fibres for Use in Cementitious Composites, Fibre Detection and Non-Destructive Testing. Materials (Basel) 2021; 14:ma14092131. [PMID: 33922255 PMCID: PMC8122764 DOI: 10.3390/ma14092131] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 04/18/2021] [Accepted: 04/20/2021] [Indexed: 11/16/2022]
Abstract
This paper deals with the description, measurement, and use of electromagnetic properties of ferromagnetic fibres used as dispersed fibre reinforcement in composite mixtures. Firstly, the fibres' magnetic properties are shown, and a method of measuring the hysteresis loop of fibres is proposed. The results from the measurements are presented and a discussion of the influence of measured parameters on the fibres' orientation in a magnetic field is performed. Furthermore, methods of non-destructive estimation, of their amount and orientation in the composite specimens, are discussed. The main experimental goal of this paper is to show the relationship between this non-destructive method's results and the destructive flexural strength measurements. The method is sensitive enough to provide information related to fibre reinforcement.
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Affiliation(s)
- Karel Künzel
- Department of Electrotechnology, Faculty of Electrical Engineering, Czech Technical University in Prague, Technická 2, 166 27 Prague 6, Czech Republic; (K.K.); (V.P.)
| | - Václav Papež
- Department of Electrotechnology, Faculty of Electrical Engineering, Czech Technical University in Prague, Technická 2, 166 27 Prague 6, Czech Republic; (K.K.); (V.P.)
| | - Kristýna Carrera
- Experimental Centre, Faculty of Civil Engineering, Czech Technical University in Prague, Thákurova 7, 166 29 Prague 6, Czech Republic; (K.C.); (P.K.); (M.M.); (P.K.)
| | - Petr Konrád
- Experimental Centre, Faculty of Civil Engineering, Czech Technical University in Prague, Thákurova 7, 166 29 Prague 6, Czech Republic; (K.C.); (P.K.); (M.M.); (P.K.)
| | - Michal Mára
- Experimental Centre, Faculty of Civil Engineering, Czech Technical University in Prague, Thákurova 7, 166 29 Prague 6, Czech Republic; (K.C.); (P.K.); (M.M.); (P.K.)
| | - Přemysl Kheml
- Experimental Centre, Faculty of Civil Engineering, Czech Technical University in Prague, Thákurova 7, 166 29 Prague 6, Czech Republic; (K.C.); (P.K.); (M.M.); (P.K.)
| | - Radoslav Sovják
- Experimental Centre, Faculty of Civil Engineering, Czech Technical University in Prague, Thákurova 7, 166 29 Prague 6, Czech Republic; (K.C.); (P.K.); (M.M.); (P.K.)
- Correspondence:
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Papež V, Denaxas S, Hemingway H. Evaluation of Semantic Web Technologies for Storing Computable Definitions of Electronic Health Records Phenotyping Algorithms. AMIA Annu Symp Proc 2018; 2017:1352-1361. [PMID: 29854204 PMCID: PMC5977586] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Electronic Health Records are electronic data generated during or as a byproduct of routine patient care. Structured, semi-structured and unstructured EHR offer researchers unprecedented phenotypic breadth and depth and have the potential to accelerate the development of precision medicine approaches at scale. A main EHR use-case is defining phenotyping algorithms that identify disease status, onset and severity. Phenotyping algorithms utilize diagnoses, prescriptions, laboratory tests, symptoms and other elements in order to identify patients with or without a specific trait. No common standardized, structured, computable format exists for storing phenotyping algorithms. The majority of algorithms are stored as human-readable descriptive text documents making their translation to code challenging due to their inherent complexity and hinders their sharing and re-use across the community. In this paper, we evaluate the two key Semantic Web Technologies, the Web Ontology Language and the Resource Description Framework, for enabling computable representations of EHR-driven phenotyping algorithms.
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Affiliation(s)
- Václav Papež
- Institute of Health Informatics, University College London, London, UK
- Farr Institute of Health Informatics Research, University College London, London, UK
| | - Spiros Denaxas
- Institute of Health Informatics, University College London, London, UK
- Farr Institute of Health Informatics Research, University College London, London, UK
| | - Harry Hemingway
- Institute of Health Informatics, University College London, London, UK
- Farr Institute of Health Informatics Research, University College London, London, UK
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Papež V, Mouček R. Applying an Archetype-Based Approach to Electroencephalography/Event-Related Potential Experiments in the EEGBase Resource. Front Neuroinform 2017; 11:24. [PMID: 28428750 PMCID: PMC5382193 DOI: 10.3389/fninf.2017.00024] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2016] [Accepted: 03/17/2017] [Indexed: 11/13/2022] Open
Abstract
PURPOSE The purpose of this study is to investigate the feasibility of applying openEHR (an archetype-based approach for electronic health records representation) to modeling data stored in EEGBase, a portal for experimental electroencephalography/event-related potential (EEG/ERP) data management. The study evaluates re-usage of existing openEHR archetypes and proposes a set of new archetypes together with the openEHR templates covering the domain. The main goals of the study are to (i) link existing EEGBase data/metadata and openEHR archetype structures and (ii) propose a new openEHR archetype set describing the EEG/ERP domain since this set of archetypes currently does not exist in public repositories. METHODS The main methodology is based on the determination of the concepts obtained from EEGBase experimental data and metadata that are expressible structurally by the openEHR reference model and semantically by openEHR archetypes. In addition, templates as the third openEHR resource allow us to define constraints over archetypes. Clinical Knowledge Manager (CKM), a public openEHR archetype repository, was searched for the archetypes matching the determined concepts. According to the search results, the archetypes already existing in CKM were applied and the archetypes not existing in the CKM were newly developed. openEHR archetypes support linkage to external terminologies. To increase semantic interoperability of the new archetypes, binding with the existing odML electrophysiological terminology was assured. Further, to increase structural interoperability, also other current solutions besides EEGBase were considered during the development phase. Finally, a set of templates using the selected archetypes was created to meet EEGBase requirements. RESULTS A set of eleven archetypes that encompassed the domain of experimental EEG/ERP measurements were identified. Of these, six were reused without changes, one was extended, and four were newly created. All archetypes were arranged in the templates reflecting the EEGBase metadata structure. A mechanism of odML terminology referencing was proposed to assure semantic interoperability of the archetypes. The openEHR approach was found to be useful not only for clinical purposes but also for experimental data modeling.
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Affiliation(s)
- Václav Papež
- Department of Computer Science and Engineering, University of West Bohemia, Plzeň, Czech Republic.,New Technologies for the Information Society (NTIS), University of West Bohemia, Plzeň, Czech Republic
| | - Roman Mouček
- Department of Computer Science and Engineering, University of West Bohemia, Plzeň, Czech Republic.,New Technologies for the Information Society (NTIS), University of West Bohemia, Plzeň, Czech Republic
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Mouček R, Ježek P, Vařeka L, Rondík T, Brůha P, Papež V, Mautner P, Novotný J, Prokop T, Stěbeták J. Software and hardware infrastructure for research in electrophysiology. Front Neuroinform 2014; 8:20. [PMID: 24639646 PMCID: PMC3945519 DOI: 10.3389/fninf.2014.00020] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2013] [Accepted: 02/19/2014] [Indexed: 11/19/2022] Open
Abstract
As in other areas of experimental science, operation of electrophysiological laboratory, design and performance of electrophysiological experiments, collection, storage and sharing of experimental data and metadata, analysis and interpretation of these data, and publication of results are time consuming activities. If these activities are well organized and supported by a suitable infrastructure, work efficiency of researchers increases significantly. This article deals with the main concepts, design, and development of software and hardware infrastructure for research in electrophysiology. The described infrastructure has been primarily developed for the needs of neuroinformatics laboratory at the University of West Bohemia, the Czech Republic. However, from the beginning it has been also designed and developed to be open and applicable in laboratories that do similar research. After introducing the laboratory and the whole architectural concept the individual parts of the infrastructure are described. The central element of the software infrastructure is a web-based portal that enables community researchers to store, share, download and search data and metadata from electrophysiological experiments. The data model, domain ontology and usage of semantic web languages and technologies are described. Current data publication policy used in the portal is briefly introduced. The registration of the portal within Neuroscience Information Framework is described. Then the methods used for processing of electrophysiological signals are presented. The specific modifications of these methods introduced by laboratory researches are summarized; the methods are organized into a laboratory workflow. Other parts of the software infrastructure include mobile and offline solutions for data/metadata storing and a hardware stimulator communicating with an EEG amplifier and recording software.
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Affiliation(s)
- Roman Mouček
- Department of Computer Science and Engineering, Faculty of Applied Sciences, University of West Bohemia Plzeň, Czech Republic ; New Technologies for the Information Society, Faculty of Applied Sciences, University of West Bohemia Plzeň, Czech Republic
| | - Petr Ježek
- Department of Computer Science and Engineering, Faculty of Applied Sciences, University of West Bohemia Plzeň, Czech Republic ; New Technologies for the Information Society, Faculty of Applied Sciences, University of West Bohemia Plzeň, Czech Republic
| | - Lukáš Vařeka
- Department of Computer Science and Engineering, Faculty of Applied Sciences, University of West Bohemia Plzeň, Czech Republic
| | - Tomáš Rondík
- Department of Computer Science and Engineering, Faculty of Applied Sciences, University of West Bohemia Plzeň, Czech Republic ; New Technologies for the Information Society, Faculty of Applied Sciences, University of West Bohemia Plzeň, Czech Republic
| | - Petr Brůha
- Department of Computer Science and Engineering, Faculty of Applied Sciences, University of West Bohemia Plzeň, Czech Republic ; New Technologies for the Information Society, Faculty of Applied Sciences, University of West Bohemia Plzeň, Czech Republic
| | - Václav Papež
- Department of Computer Science and Engineering, Faculty of Applied Sciences, University of West Bohemia Plzeň, Czech Republic
| | - Pavel Mautner
- Department of Computer Science and Engineering, Faculty of Applied Sciences, University of West Bohemia Plzeň, Czech Republic
| | - Jiří Novotný
- Department of Computer Science and Engineering, Faculty of Applied Sciences, University of West Bohemia Plzeň, Czech Republic
| | - Tomáš Prokop
- Department of Computer Science and Engineering, Faculty of Applied Sciences, University of West Bohemia Plzeň, Czech Republic
| | - Jan Stěbeták
- Department of Computer Science and Engineering, Faculty of Applied Sciences, University of West Bohemia Plzeň, Czech Republic
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Papež V, Večerník J. Simultaneous determination of zinc, iron and chlorides in radiopharmaceutical gallium /67Ga/ citrate injections by FSDP or DP polarography. J Radioanal Nucl Chem 1985. [DOI: 10.1007/bf02163048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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