| 41. |
- Eriksson, Anders, et al.
(författare)
-
RPC-LAP : The Rosetta Langmuir probe instrument
- 2007
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Ingår i: Space Science Reviews. - : Springer Science and Business Media LLC. - 0038-6308 .- 1572-9672. ; 128:04-jan, s. 729-744
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Forskningsöversikt (refereegranskat)abstract
- The Rosetta dual Langmuir probe instrument, LAP, utilizes the multiple powers of a pair of spherical Langmuir probes for measurements of basic plasma parameters with the aim of providing detailed knowledge of the outgassing, ionization, and subsequent plasma processes around the Rosetta target comet. The fundamental plasma properties to be studied are the plasma density, the electron temperature, and the plasma flow velocity. However, study of electric fields up to 8 kHz, plasma density fluctuations, spacecraft potential, integrated UV flux, and dust impacts is also possible. LAP is fully integrated in the Rosetta Plasma Consortium (RPC), the instruments of which together provide a comprehensive characterization of the cometary plasma.
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| 42. |
- Eriksson, Joakim, 1977-, et al.
(författare)
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MODELLING DECISION-MAKING IN COMPLEX PRODUCT DEVELOPMENT
- 2008
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Ingår i: Proceedings of the DESIGN 2008, 10th International Design Conference, Dubrovnik, Croatia. - Dubrovnik. - 9789536313891 ; , s. 1129-1138
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Konferensbidrag (refereegranskat)abstract
- One challenge today for companies lies in finding the right approach to measuring and continuously improving the current state of a company’s product development process. The task of continuously improving the performance demands the successful management of information, communication, cooperation and decision-making in a context of uncertainty, which is a highly complex task in itself. To be able to manage a complex product development system in an appropriate way, the authors have identified three important interdependent aspects of product development. The aspects are decision-making, uncertainty and performance. These aspects form the foundation for the suggested model which is intended to be used by engineering design researchers.
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| 43. |
- Hermann, Fredrik, et al.
(författare)
-
Chemical analysis of combustion products from a high-pressure gas turbine combustor rig fueled by jet A1 fuel and a Fischer-Tropsch-based fuel
- 2006
-
Ingår i: Proceedings of the ASME Turbo Expo. - 0791842363 ; 1, s. 523-532
-
Konferensbidrag (refereegranskat)abstract
- A comparative experimental investigation has been performed, comparing the emissions from a synthetic jet fuel and from Jet AI. In the investigation, the unburned hydrocarbons were analyzed chemically and the regulated emissions of NOX, CO and HC were measured. All combustion tests were performed under elevated pressures in a gas turbine combustor rig. A Swedish company, Oroboros AB, has developed a novel clean synthetic jet fuel, LeanJet [registered trademark] . The fuel is produced synthetically from synthesis gas by a Fischer-Tropsch process. Except for the density, the fuel conforms to the Standard Specification for Aviation Turbine Fuels. The low density is due to the lack of aromatics and polyaromatics. Organic emissions from the gas turbine combustor rig were collected by adsorption sampling and analyzed chemically. Both the fuels and the organic emissions were analyzed by gas chromatography/flame ionization (GC/FlD) complemented with gas chromatography/mass spectrometry (GC/MS). Under the operating conditions investigated, no significant differences were found for the regulated emissions, except for emission of CO from the synthetic fuel, which, at leaner conditions, was one-quarter of that measured for Jet Al. Detailed analysis of the organic compounds showed that the emissions from both fuels were dominated by fuel alkanes and a significant amount of naphthalene. It was also found that Jet Al produced a much higher amount of benzene than the synthetic fuel. Copyright
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| 44. |
- Hermann, Fredrik, et al.
(författare)
-
Chemical analysis of combustion products from a high-pressure gas turbine combustor rig fueled by jet A1 fuel and a flscher-tropsch-based fuel
- 2006
-
Ingår i: Proceedings of the ASME Turbo Expo 2006 - Power for Land, Sea, and Air. - 0791842363 - 9780791842362 - 0791837742 ; 1, s. 523-532
-
Konferensbidrag (refereegranskat)abstract
- A comparative experimental investigation has been performed, comparing the emissions from a synthetic jet fuel and from Jet AI. In the investigation, the unburned hydrocarbons were analyzed chemically and the regulated emissions of NOX, CO and HC were measured. All combustion tests were performed under elevated pressures in a gas turbine combustor rig. A Swedish company, Oroboros AB, has developed a novel clean synthetic jet fuel, LeanJet®. The fuel is produced synthetically from synthesis gas by a Fischer-Tropsch process. Except for the density, the fuel conforms to the Standard Specification for Aviation Turbine Fuels. The low density is due to the lack of aromatics and polyaromatics. Organic emissions from the gas turbine combustor rig were collected by adsorption sampling and analyzed chemically. Both the fuels and the organic emissions were analyzed by gas chromatography/flame ionization (GC/FlD) complemented with gas chromatography/mass spectrometry (GC/MS). Under the operating conditions investigated, no significant differences were found for the regulated emissions, except for emission of CO from the synthetic fuel, which, at leaner conditions, was one-quarter of that measured for Jet Al. Detailed analysis of the organic compounds showed that the emissions from both fuels were dominated by fuel alkanes and a significant amount of naphthalene. It was also found that Jet Al produced a much higher amount of benzene than the synthetic fuel.
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| 45. |
- Herreros, Alberto, et al.
(författare)
-
An Algorithm for Phase-Space Detection of the P Characteristic Points
- 2007
-
Ingår i: PROC. annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC2007). Lyon, France, Aug 23-26, 2007. - 1557-170X. ; 1, s. 2004-2007
-
Konferensbidrag (refereegranskat)abstract
- A new algorithm, based on embedding phase space, to detect the P-wave characteristic points of an ECG signal is reported in this paper. The multi-lead ECG is transformed into points of an embedding phase space where similar ECG morphologies are converted into phase space points that are close using some distance measure. The algorithm is robust with respect to the type of selected characteristic points (onset, peak and end), morphology changes, baseline oscillations and high frequency noise. The performance of the algorithm has been succesfully validated using both simulated and real ECG signals.
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| 46. |
- Herreros, Alberto, et al.
(författare)
-
Analysis of Changes in the Beat-to-Beat P-wave Morphology Using Clustering Techniques
- 2009
-
Ingår i: Biomedical Signal Processing and Control. - : Elsevier BV. - 1746-8094. ; 4:4, s. 309-316
-
Tidskriftsartikel (refereegranskat)abstract
- Several pathologies related to the atrial electrical activity can be detected in the electrocardiogram P-wave. A protocol for analyzing P-wave morphology changes has been developed in this article. By using this protocol a study on the beat-to-beat P-wave morphology changes of 89 ECG signals is performed. An algorithmbased on the embedding space techniques has been used to extract the P-wave information of the ECG. The P-waves obtained in several of these ECGs exhibit significant alternate morphology changes. The morphologies have been classified by using the K-means clustering algorithm. The mechanism behind the P-wave morphology change process and its possible pathophysiological importance remains to be clarified.
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| 47. |
- Herreros, Alberto, et al.
(författare)
-
Analysis of Changes in the Beat-to-Beat P-Wave Morphology Using Clustering Techniques
- 2008
-
Ingår i: Proceedings of the 17th World Congress Proceedings of the 17th World Congress of The International Federation of Automatic Control. - 1474-6670. - 9783902661005 ; 41:1, s. 5215-5220
-
Konferensbidrag (refereegranskat)abstract
- Several pathologies related to the atrial electrical activity can be detected in the electrocardiogram P-wave. A study on the beat-to-beat P-wave morphology changes of 89 ECG signals is performed in this article. An algorithm based on the embedding space techniques has been used to extract the P-wave information of the ECG. The P-waves obtained in several of these ECGs exhibit intermittent morphology changes. The morphologies have been classified by using the K-means clustering algorithm. The mechanism behind different P-wave morphologies and its possible pathophysiological importance remains to be clarified.
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| 48. |
- Johannesson, Nina, et al.
(författare)
-
Screening for biomarkers in plasma from patients with gangrenous phlegmonous appendicitis using CE and CEC in combination with MS
- 2007
-
Ingår i: Electrophoresis. - : Wiley. - 0173-0835 .- 1522-2683. ; 28:9, s. 1435-1443
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Tidskriftsartikel (refereegranskat)abstract
- Today a high degree of "false" appendicitis diagnoses are occurring. In this study, a screening experiment of biomarkers of two different kinds of appendicitis, gangrenous and phlegmonous, were conducted with CE and CEC coupled to MS. Plasma samples were obtained from patients pre- and post-surgery. A large amount of data was generated to be able to compare them, and chemometrics tools were utilized to visualize the differences. Indicative patterns were found for both pre- and post-surgery of the two types of inflammation as well as between them. The divergences were traced back to the MS peaks obtained in the CE- and CEC-MS setups as possible biomarkers for the two forms of appendicitis.
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| 49. |
- Johnsson, Stefan, et al.
(författare)
-
Modeling Performance in Complex Product Development : A Product Development Organisational Performance Model
- 2008
-
Ingår i: Proceedings of the 17th International Conference on Management of Technology. 2008, IAMOT.
-
Konferensbidrag (refereegranskat)abstract
- The contribution of this research is the Product Development Organizational Performance Model (PDOPM). The model consists of three generic levels of activities: product strategy, project management and product activities. Each level of activity uses resources to transform input to output under the direction of goals and constraints. This view of an activity is based on the IDEF0 concept. The goal of the product strategy activity is related to the business strategy and the output of the activity is the goal for the project management activity. Project management translates the goal into outputs that become goals for the product activities. This way of modeling the product development (PD) process with three generic levels of activities makes it possible to analyze performance from the three perspectives. Effectiveness, efficiency and uncertainty are defined for the three generic levels of activities. Effectiveness can be expressed as how the output relates to the goal of the activities whereas efficiency can be defined as the difference between output and input divided by the used resources. The uncertainty can be viewed as the difference between the goal and the input. A first verification of the PDOPM has been performed by a root cause analysis of three problem areas selected from the result of a previously conducted case study. Furthermore, the PDOPM can be used as a way of discussing the effect which these three levels of activities have on PD as a whole (i.e. from a holistic view, aligning product strategy, project management, and product activities).
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| 50. |
- Kalaitzakis, Evangelos, 1976, et al.
(författare)
-
Gastrointestinal symptoms in patients with liver cirrhosis: associations with nutritional status and health-related quality of life.
- 2006
-
Ingår i: Scandinavian journal of gastroenterology. - : Informa UK Limited. - 0036-5521 .- 1502-7708. ; 41:12, s. 1464-72
-
Tidskriftsartikel (refereegranskat)abstract
- OBJECTIVE: Gastrointestinal symptoms can lead to decreased food intake and thereby increased morbidity. There is a general lack of data on the prevalence of gastrointestinal symptoms and their potential association with malnutrition and health-related quality of life (QoL) in cirrhosis. Our aim was to prospectively evaluate gastrointestinal symptoms, malnutrition, and QoL in patients with cirrhosis. MATERIAL AND METHODS: Two validated questionnaires were used to measure gastrointestinal symptoms (gastrointestinal symptom rating scale (GSRS)) and health-related QoL (SF-36) in 128 consecutive cirrhotics (mean age 57 years, Child-Pugh score 8.6, MELD score 13.2) at a tertiary referral center. The results were compared with those of controls from the general population. Nutritional status was assessed by anthropometry and estimation of recent weight change. RESULTS: Compared to controls, cirrhotic patients showed higher gastrointestinal symptom severity (total GSRS score: 1.53, 95% CI 1.50-1.55 versus 2.21, 95% CI 2.04-2.38) and profound reductions in the SF-36 physical (47.0 95% CI 45.0-49.0 versus 37.9, 95% CI 35.7-40.1) and mental component summary scores (51.0 95% CI 49.0-53.0 versus 39.2 95% CI 36.7-41.6). There were no significant differences in any GSRS domain between patients with and those without malnutrition. Multivariate analysis showed that gastrointestinal symptom severity was associated with the Child-Pugh score (beta = 0.10, r<0.05), daily lactulose use (beta = 0.65, p<0.005), and the presence of gastrointestinal comorbidities (beta = 0.51, p<0.05). Negative weight change (beta = -0.72, p<0.05) and the SF-36 physical (beta = -4.26, p<0.005) and mental (beta = -4.53, p<0.005) summaries were independently related to gastrointestinal symptom severity. CONCLUSIONS: Patients with cirrhosis show increased severity of gastrointestinal symptoms, which are associated with recent weight loss and impaired health-related QoL. The severity of gastrointestinal symptoms seems to be related to the severity of cirrhosis.
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