| 1. |
- Andersson, Mike, et al.
(författare)
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Investigations on the possibilities of a MISiCFET sensor system for OBD and combustion control utilizing different catalytic gate materials
- 2004
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Ingår i: Topics in catalysis. - 1022-5528 .- 1572-9028. ; 30-31:1, s. 365-368
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Tidskriftsartikel (refereegranskat)abstract
- Different catalytic materials, like Pt and Ir, applied as gate contacts on metal insulator silicon carbide field effect transistors — MISiCFET—facilitate the manufacture of gas sensor devices with differences in selectivity, devices which due to the chemical stability and wide band gap of SiC are suitable for high temperature applications. The combination of such devices in a sensor system, utilizing multivariate analysis/modeling, have been tested and some promising results in respect of monitoring a few typical exhaust and flue gas constituents, in the future aiming at on board diagnostics (OBD) and combustion control, have been obtained.
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| 2. |
- Andersson, Mike, et al.
(författare)
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On the applicability of MISiCFET gas sensors regarding ammonia slip monitoring in small-scale boilers running SNCR
- 2007
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- Gas sensitive Metal Insulator Silicon Carbide Field Effect Transistor – MISiCFET – devices have shown good possibilities of realizing sensors for high temperature applications. One such application could be the monitoring of ammonia slip from boilers running SNCR – Selective Non-Catalytic Reduction of nitrogen oxides (NOx) with ammonia (NH3). In this study a number of MISiCFET gas sensors operated at different temperatures and with both platinum (Pt) and iridium (Ir) as the gate contact have been tested for their ability to detect and quantify ammonia slip in flue gases from a 5.6 MW wood fired boiler during a test of a new SNCR-system. The individual sensors have been evaluated and compared to each other for the sensitivity towards NH3 and possible cross-sensitivities to other flue gas species through the comparison of the sensor signals with the signals from analytical instruments like FTIR – Fourier Transform Infrared spectroscopy – for nitrogen oxides (NO + NO2), NH3, and carbon monoxide (CO) and an FID – Flame Ionization Detector – for the Total Hydrocarbon Concentration (THC). The ability of a combination of sensors to provide extra or more accurate information about the NH3 concentration was also evaluated through the construction and validation of a Partial Least Squares – PLS – regression model based on all the sensor signals. Under the assumption that the sensors’ responses follow a logarithmic dependence on NH3 concentration the results regarding ammonia slip quantification were promising both for a single Ir sensor and for the system based on all sensors. There is still a question mark for the long-term stability of the devices in real flue gases, however.
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| 3. |
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| 4. |
- Hartford, Marianne, 1944, et al.
(författare)
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C-reactive protein, interleukin-6, secretory phospholipase A(2) group IIA and intercellular adhesion molecule-1 in the prediction of late outcome events after acute coronary syndromes
- 2007
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Ingår i: J Intern Med. - : Wiley. - 0954-6820 .- 1365-2796. ; 262:5, s. 526-536
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Tidskriftsartikel (refereegranskat)abstract
- Objective. We investigated whether levels of C-reactive protein (CRP), interleukin-6 (IL-6), secretory phospholipase A(2) group IIA (sPLA(2)-IIA) and intercellular adhesion molecule-1 (ICAM-I) predict late outcomes in patients with acute coronary syndromes (ACS). Design. Prospective longitudinal study. CRP (mg L(-1)), IL-6 (pg mL(-1)), sPLA(2)-IIA (ng mL(-1)) and ICAM-1 (ng mL(-1)) were measured at days 1 (n = 757) and 4 (n = 533) after hospital admission for ACS. Their relations to mortality and rehospitalization for myocardial infarction (MI) and congestive heart failure (CHF) were determined. Setting. Coronary Care Unit at Sahlgrenska University Hospital, Gothenburg, Sweden. Subjects. Patients with ACS alive at day 30; median follow-up 75 months. Results. Survival was related to day 1 levels of all markers. After adjustment for confounders, CRP, IL-6 and ICAM-1, but not sPLA(2)-IIA, independently predicted mortality and rehospitalization for CHF. For CRP, the hazard ratio (HR) was 1.3 for mortality (95% confidence interval (CI): 1.1-1.5, P = 0.003) and 1.4 for CHF (95% CI: 1.1-1.9, P = 0.006). For IL-6, HR was 1.3 for mortality (95% CI: 1.1-1.6, P < 0.001) and 1.4 for CHF (95% CI: 1.1-1.8, P = 0.02). For ICAM-1, HR was 1.2 for mortality (95% CI: 1.0-1.4, P = 0.04) and 1.3 for CHF (95% CI: 1.0-1.7, P = 0.03). No marker predicted MI. Marker levels on day 4 provided no additional predictive value. Conclusions. In patients with ACS, CRP, IL-6, sPLA(2)-IIA and ICAM-1 are associated with long-term mortality and CHF, but not reinfarction. CRP, IL-6 and ICAM-1 provide prognostic information beyond that obtained by clinical variables.
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| 5. |
- Hartford, Marianne, 1944, et al.
(författare)
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Interleukin-18 as a Predictor of Future Events in Patients With Acute Coronary Syndromes.
- 2010
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Ingår i: Arteriosclerosis, thrombosis, and vascular biology. - : Lippincott Williams & Wilkins. - 1524-4636 .- 1079-5642. ; 30:10, s. 2039-2046
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Tidskriftsartikel (refereegranskat)abstract
- OBJECTIVE: The aim of this study was to assess the short- and long-term prognostic significance of interleukin-18 (IL-18) levels in patients with acute coronary syndromes (ACS). METHODS AND RESULTS: In patients hospitalized with ACS (median age, 66 years; 30% females), we evaluated associations of serum IL-18 levels from day 1 (n=1261) with the short- (<3 months) and long-term (median, 7.6 years) risk of death, development of congestive heart failure (CHF), and myocardial infarction (MI). IL-18 was not significantly associated with short-term mortality. In the long term, IL-18 levels were significantly related to all-cause mortality, even after adjustment for clinical confounders (hazard ratio [HR], 1.19; 95% confidence interval, 1.07 to 1.33; P=0.002). Long-term, cardiovascular mortality was univariately related to IL-18, and the adjusted relation between noncardiovascular mortality and IL-18 was highly significant (HR, 1.36; 95% confidence interval, 1.11 to 1.67; P=0.003). IL-18 independently predicted CHF, MI, and cardiovascular death/CHF/MI in both the short and long term. Measurements from day 1 of ACS and 3 months after ACS had a similar power to predict late outcome. CONCLUSIONS: The addition of the measurement of IL-18 to clinical variables improved the prediction of risk of all-cause and noncardiovascular mortality. The association between IL-18 and noncardiovascular mortality is intriguing and warrants further study.
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| 6. |
- Kajko-Mattsson, Miroslawa E J, et al.
(författare)
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Fundamentals of the eMaintenance Concept
- 2010
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Ingår i: 1st International Workshop and Congress on eMaintenance. - 9789174391206
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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| 7. |
- Kajko-Mattsson, Mira, et al.
(författare)
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Essential components of e-maintenance
- 2011
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Ingår i: International Journal of Performability Engineering. - 0973-1318. ; 7:6, s. 555-571
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Tidskriftsartikel (refereegranskat)abstract
- Many intellectual, societal, business and technological forces are continuously pushing forward the frontiers of science. When combined, they provide an umbrella for generating new fields and exploring new grounds. One such a new field is e-Maintenance. e-Maintenance addresses new needs and provides various benefits in form of increased availability, reduced lifecycle cost and increased customer value. However, it suffers from lack of a commonly defined basis supporting the existence of e-Maintenance and determining the essential components inherent in the e-Maintenance domain. In this paper, we suggest an initial set of components that serve as the groundwork of the e-Maintenance universe. The set outlines ten initial components. These are definition, business,organization, product,service,methodology,technology,information,customer,and education and training. The paper also suggests a definition of e-Maintenance, places eMaintenance in the context of other e-Domains, and elicits e-Maintenance intellectual opportunities and challenges to be met by both the academia and industry.
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| 8. |
- Kajko-Mattsson, Mira, et al.
(författare)
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Fundamentals of the eMaintenance Concept
- 2010
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Ingår i: <em>Proceedings of the 1st International Congress on eMaintenance</em>. - Luleå, Sweden : Luleå University of Technology. - 9789174391206 ; , s. 147-154
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Konferensbidrag (refereegranskat)abstract
- Many intellectual, societal, business and technological forces are continuously pushing forward the frontiers of science. When being effectively combined, they may provide an umbrella for generating new fields and exploring new grounds. One such emerging field is eMaintenance. It is based on the fields from operation & maintenance engineering, software engineering, information systems, business management, and many other strongly varying fields related to the application domains of eMaintenance. As a novel field, eMaintenance addresses new needs and provides various benefits in form of increased availability, reduced lifecycle cost and increased customer-value. On the other hand, being in a continuous flux, it suffers from many infant illnesses in form of lack of or fuzzy definitions and theoretical foundations. This paper constitutes the first call to the eMaintenance community to gather their forces and commonly define the eMaintenance concept. As an initial step, it outlines its ten essential components. These are (1) Definition, (2) Business, (3) Organization, (4) Product, (5) Service, (6) Methodology, (7) Technology, (8) Information, (9) Customer, and (10) Education and Training. The paper also suggests a timeless definition of eMaintenance, it places eMaintenance in the context of other eDomains, and it elicits eMaintenance intellectual opportunities and challenges to be met by both the academia and industry when researching on or transitioning to the eMaintenance mode.
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| 9. |
- Kajko-Mattsson, Mira, et al.
(författare)
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Fundamentals of the eMaintenance concept
- 2010
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Ingår i: Proceedings of the 1st international workshop and congress on eMaintenance. - : Luleå tekniska universitet. - 9789174391206 ; , s. 147-154
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Konferensbidrag (refereegranskat)abstract
- Many intellectual, societal, business and technological forces are continuously pushing forward the frontiers of science. When being combined effectively, they may provide an umbrella for generating new fields and exploring new grounds. One such emerging field is eMaintenance. It is based on the fields from operation & maintenance engineering, software engineering, information systems, business management, and a myriad of strongly varying fields related to the application domains of eMaintenance. As a novel field, eMaintenance addresses new needs and provides various benefits in form of increased availability, reduced lifecycle cost and increased customer-value. On the other hand, being in a continuous flux, it suffers from many infant illnesses in form of lack of or fuzzy definitions and theoretical foundations. This paper explores the domain of eMaintenance. In striving toward that end, it defines the eMaintenance concept by identifying its essential constituents and characteristics, mapping out its application domains and by eliciting its intellectual opportunities and challenges. Finally, the paper reasons about the future of eMaintenance as an emerging field and identifies research questions that may serve as the impetus for defining future research strategies. Last but not least, it lists challenges to be met by the organizations transferring to eMainteannce and advocates to the eMaintenance community to further elaborate and improve the eMaintenance concept.
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| 10. |
- Leul, Melakeselam, et al.
(författare)
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Molecular characterization of uptake hydrogenase in Frankia
- 2005
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Ingår i: Biochemical Society Transactions. - London : Biochemical Society. - 0300-5127 .- 1470-8752. ; 33:1, s. 64-66
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Tidskriftsartikel (refereegranskat)abstract
- A molecular characterization of uptake hydrogenase in Fronkia was performed by using two-dimensional gel electrophoresis, matrix-assisted laser-desorption ionization-time-of-flight mass spectrometry, PCR amplification and Southern blotting. A polypeptide of approx. 60 kDa was recognized in Frankia UGL011102, AVCI1 and KBS on the two-dimensional gel by blotting with Ralstonia eutropha (Hox G) antibody. Further analysis by MS resulted in a peptide 'fingerprint', which was similar to the membrane-bound hydrogenase 2 large subunit (HYD2) in Escherichia coli. in addition, a 127 bp PCR fragment could also be amplified from Frankia AVCI1, which gave a 76% similarity with the large subunit of hydrogenase in, e.g., Azotobacter chrococcum, Bradyrhizobium japonicum and Rhizobium leguminosorum. Although immunological similarity between the small subunit of Frankia hydrogenase and that of other organisms has not yet been found, a PCR product of 500 bp could be amplified from the local source of Fronkia, the analysis of which gave 69 and 67% identity with the small subunit of hydrogenases in B. japonicum and R. leguminosorum respectively. A Southern-blot analysis further indicated evidence for the presence of the small hydrogenase subunit in other Fronkia strains, i.e. KBS, Avcl1 and Ccl3.
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