Search results for: Christer Ahlstrom

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Ahlstrom</title> <meta name="description" content="Search results for: Christer Ahlstrom"> <meta name="keywords" content="Christer Ahlstrom"> <meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1, user-scalable=no"> <meta charset="utf-8"> <link href="https://cdn.waset.org/favicon.ico" type="image/x-icon" rel="shortcut icon"> <link href="https://cdn.waset.org/static/plugins/bootstrap-4.2.1/css/bootstrap.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/plugins/fontawesome/css/all.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/css/site.css?v=150220211555" rel="stylesheet"> </head> <body> <header> <div class="container"> <nav class="navbar navbar-expand-lg navbar-light"> <a class="navbar-brand" href="https://waset.org"> <img src="https://cdn.waset.org/static/images/wasetc.png" alt="Open Science Research Excellence" title="Open Science Research Excellence" /> </a> <button class="d-block d-lg-none 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action="https://publications.waset.org/search"> <div id="custom-search-input"> <div class="input-group"> <i class="fas fa-search"></i> <input type="text" class="search-query" name="q" placeholder="Author, Title, Abstract, Keywords" value="Christer Ahlstrom"> <input type="submit" class="btn_search" value="Search"> </div> </div> </form> </div> </div> <div class="row mt-3"> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Commenced</strong> in January 2007</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Frequency:</strong> Monthly</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Edition:</strong> International</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Paper Count:</strong> 2</div> </div> </div> </div> <h1 class="mt-3 mb-3 text-center" style="font-size:1.6rem;">Search results for: Christer Ahlstrom</h1> <div class="card publication-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2</span> Distinguishing Innocent Murmurs from Murmurs caused by Aortic Stenosis by Recurrence Quantification Analysis</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/search?q=Christer%20Ahlstrom">Christer Ahlstrom</a>, <a href="https://publications.waset.org/search?q=Katja%20H%C3%B6glund"> Katja H枚glund</a>, <a href="https://publications.waset.org/search?q=Peter%20Hult"> Peter Hult</a>, <a href="https://publications.waset.org/search?q=Jens%20H%C3%A4ggstr%C3%B6m"> Jens H盲ggstr枚m</a>, <a href="https://publications.waset.org/search?q=Clarence%20Kvart"> Clarence Kvart</a>, <a href="https://publications.waset.org/search?q=Per%20Ask"> Per Ask</a> </p> <p class="card-text"><strong>Abstract:</strong></p> It is sometimes difficult to differentiate between innocent murmurs and pathological murmurs during auscultation. In these difficult cases, an intelligent stethoscope with decision support abilities would be of great value. In this study, using a dog model, phonocardiographic recordings were obtained from 27 boxer dogs with various degrees of aortic stenosis (AS) severity. As a reference for severity assessment, continuous wave Doppler was used. The data were analyzed with recurrence quantification analysis (RQA) with the aim to find features able to distinguish innocent murmurs from murmurs caused by AS. Four out of eight investigated RQA features showed significant differences between innocent murmurs and pathological murmurs. Using a plain linear discriminant analysis classifier, the best pair of features (recurrence rate and entropy) resulted in a sensitivity of 90% and a specificity of 88%. In conclusion, RQA provide valid features which can be used for differentiation between innocent murmurs and murmurs caused by AS. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/search?q=Bioacoustics" title="Bioacoustics">Bioacoustics</a>, <a href="https://publications.waset.org/search?q=murmur" title=" murmur"> murmur</a>, <a href="https://publications.waset.org/search?q=phonocardiographic%20signal" title=" phonocardiographic signal"> phonocardiographic signal</a>, <a href="https://publications.waset.org/search?q=recurrence%20quantification%20analysis." title=" recurrence quantification analysis."> recurrence quantification analysis.</a> </p> <a href="https://publications.waset.org/2998/distinguishing-innocent-murmurs-from-murmurs-caused-by-aortic-stenosis-by-recurrence-quantification-analysis" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/2998/apa" target="_blank" rel="nofollow" class="btn btn-primary btn-sm">APA</a> <a href="https://publications.waset.org/2998/bibtex" target="_blank" rel="nofollow" class="btn btn-primary btn-sm">BibTeX</a> <a href="https://publications.waset.org/2998/chicago" target="_blank" rel="nofollow" class="btn btn-primary btn-sm">Chicago</a> <a href="https://publications.waset.org/2998/endnote" target="_blank" rel="nofollow" class="btn btn-primary btn-sm">EndNote</a> <a href="https://publications.waset.org/2998/harvard" target="_blank" rel="nofollow" class="btn btn-primary btn-sm">Harvard</a> <a href="https://publications.waset.org/2998/json" target="_blank" rel="nofollow" class="btn btn-primary btn-sm">JSON</a> <a href="https://publications.waset.org/2998/mla" target="_blank" rel="nofollow" class="btn btn-primary btn-sm">MLA</a> <a href="https://publications.waset.org/2998/ris" target="_blank" rel="nofollow" class="btn btn-primary btn-sm">RIS</a> <a href="https://publications.waset.org/2998/xml" target="_blank" rel="nofollow" class="btn btn-primary btn-sm">XML</a> <a href="https://publications.waset.org/2998/iso690" target="_blank" rel="nofollow" class="btn btn-primary btn-sm">ISO 690</a> <a href="https://publications.waset.org/2998.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">2005</span> </span> </div> </div> <div class="card publication-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1</span> Method of Estimating Absolute Entropy of Municipal Solid Waste</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/search?q=Francis%20Chinweuba%20Eboh">Francis Chinweuba Eboh</a>, <a href="https://publications.waset.org/search?q=Peter%20Ahlstr%C3%B6m"> Peter Ahlstr枚m</a>, <a href="https://publications.waset.org/search?q=Tobias%20Richards"> Tobias Richards</a> </p> <p class="card-text"><strong>Abstract:</strong></p> <p>Entropy, as an outcome of the second law of thermodynamics, measures the level of irreversibility associated with any process. The identification and reduction of irreversibility in the energy conversion process helps to improve the efficiency of the system. The entropy of pure substances known as absolute entropy is determined at an absolute reference point and is useful in the thermodynamic analysis of chemical reactions; however, municipal solid waste (MSW) is a structurally complicated material with unknown absolute entropy. In this work, an empirical model to calculate the absolute entropy of MSW based on the content of carbon, hydrogen, oxygen, nitrogen, sulphur, and chlorine on a dry ash free basis (daf) is presented. The proposed model was derived from 117 relevant organic substances which represent the main constituents in MSW with known standard entropies using statistical analysis. The substances were divided into different waste fractions; namely, food, wood/paper, textiles/rubber and plastics waste and the standard entropies of each waste fraction and for the complete mixture were calculated. The correlation of the standard entropy of the complete waste mixture derived was found to be s<sup>o</sup><strong><sub>msw</sub></strong>= 0.0101C + 0.0630H + 0.0106O + 0.0108N + 0.0155S + 0.0084Cl (kJ.K<sup>-1</sup>.kg) and the present correlation can be used for estimating the absolute entropy of MSW by using the elemental compositions of the fuel within the range of 10.3% <strong>≤</strong> C <strong>≤ </strong>95.1%, 0.0% <strong>≤</strong> H <strong>≤</strong> 14.3%, 0.0% <strong>≤</strong> O <strong>≤</strong> 71.1%, 0.0 <strong>≤</strong> N <strong>≤</strong> 66.7%, 0.0% <strong>≤</strong> S <strong>≤</strong> 42.1%, 0.0% <strong>≤</strong> Cl <strong>≤</strong> 89.7%. The model is also applicable for the efficient modelling of a combustion system in a waste-to-energy plant.</p> <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/search?q=Absolute%20entropy" title="Absolute entropy">Absolute entropy</a>, <a href="https://publications.waset.org/search?q=irreversibility" title=" irreversibility"> irreversibility</a>, <a href="https://publications.waset.org/search?q=municipal%20solid%20waste" title=" municipal solid waste"> municipal solid waste</a>, <a href="https://publications.waset.org/search?q=waste-to-energy." title=" waste-to-energy."> waste-to-energy.</a> </p> <a href="https://publications.waset.org/10004826/method-of-estimating-absolute-entropy-of-municipal-solid-waste" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/10004826/apa" target="_blank" rel="nofollow" class="btn btn-primary btn-sm">APA</a> <a href="https://publications.waset.org/10004826/bibtex" target="_blank" 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Search results for: Christer Ahlstrom