| 1. |
- Adloff, C, et al.
(författare)
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Energy flow and rapidity gaps between jets in photoproduction at HERA
- 2002
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Ingår i: European Physical Journal C. Particles and Fields. - : Springer Science and Business Media LLC. - 1434-6044. ; 24:4, s. 517-527
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Tidskriftsartikel (refereegranskat)abstract
- Dijet events in photon-proton collisions in which there is a large pseudorapidity separation, Deltaeta > 2.5 between the two highest E-T jets are studied with the H1 detector at HERA. The inclusive dijet cross sections are measured as functions of the longitudinal momentum fractions of the proton and photon which participate in the production of the jets, x(p)(jets) and x(gamma)(jets) respectively, Deltaeta, the pseudorapidity P separation between the two highest E-T jets, and E-T(gap), the total summed transverse energy between the jets. Rapidity gap events are defined as events in which E-T(gap) is less than E-T(cut), for E-T(cut) varied between jets 0.5 and 2.0 GeV. The fraction of dijet events with a rapidity gap is measured differentially in Deltaeta, x(p)(jets) and x(gamma)(jets). An excess of events with rapidity gaps at low values of E-T(cut) is observed above the expectation from standard photoproduction processes. This excess can be explained by the exchange of a strongly interacting colour singlet object between the jets.
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| 2. |
- Backhaus, Erik, et al.
(författare)
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Antimicrobial susceptibility of invasive pneumococcal isolates from a region in south-west Sweden 1998-2001.
- 2007
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Ingår i: Scandinavian journal of infectious diseases. - : Informa UK Limited. - 0036-5548 .- 1651-1980. ; 39:1, s. 19-27
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Tidskriftsartikel (refereegranskat)abstract
- Invasive disease caused by antibiotic resistant pneumococci is a worldwide problem. All invasive pneumococcal strains in an area of south-west Sweden with 1.7 million inhabitants were collected prospectively during 1998-2001. Minimum inhibitory concentrations (MICs) were determined by E-test and correlated to serotypes and clinical characteristics. Of 827 strains, 744 (90%) were susceptible (S) to all agents tested and 83 (10%) were indeterminate (I) or resistant (R) to at least 1 agent. 22 isolates (2.7%) were I to penicillin (MIC >0.06 to < or = 1.0 mg/l), but none were R (MIC >1.0 mg/l). Numbers and proportions of decreased susceptibility against other agents tested were as follows: erythromycin R: 30 (3.6%), clindamycin R: 6 (0.7%), tetracycline R: 16 (1.9%), moxifloxacin R: 1 (0.1%), cotrimoxazole I: 17 (2%) and R: 31(4%). Non-susceptibility to at least 1 agent was not correlated with age, clinical manifestation, underlying diseases and outcome. The serotype distribution differed between non-susceptible and susceptible strains. The serotypes in the 7-valent pneumococcal conjugate vaccine covered 42% of all infections and 73% of those caused by non-susceptible strains. In conclusion, the impact of antibiotic resistance in invasive pneumococcal disease remains limited in south-west Sweden.
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| 3. |
- Grill, Martin, 1979, et al.
(författare)
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Säker ledare – ett samverkansprojekt för att förbättra säkerhetsledarskap och säkerhetskultur i bygg- och anläggningsindustrin
- 2023
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Syftet med forskningsprojektet Säker ledare var att undersöka hur byggplatschefer påverkas av, och själva påverkar, säkerhetskulturen i svensk bygg- och anläggningsindustri, samt hur platschefers ledarskap kan utvecklas genom individualiserad träning i beteendebaserat säkerhetsledarskap (ITBS). För projektet utformades en longitudinell enkätstudie med tre mättillfällen. Dessutom utvecklades ett ledarträningsprogram för säkerhetsledarskap, som utvärderades genom en randomiserad kontrollerad studie samt en intervjustudie. I forskningsprojektet deltog 68 platschefer från 30 olika byggföretag med sina projektchefer (n = 58) arbetsledare (n = 101) och yrkesarbetare (n = 123). Resultaten indikerar att platschefer påverkar sina arbetsledares säkerhetsledarskap och sina medarbetares säkerhetsbeteenden. Delstudie ett visar att platschefen är rollmodell för arbetsledares säkerhetsledarskap och att arbetsledare formar sitt säkerhetsledarskap efter det ledarskap som deras platschefer utövar, både när det gäller belönande ledarskap och säkerhetsspecifik återkoppling. Delstudie två visar att platschefers säkerhetsprioritering ökar medarbetares voice-beteenden. Resultaten indikerar också att platschefers säkerhetsledarskap påverkas av arbetsledares säkerhetsledarskap och medarbetares säkerhetsbeteenden. Delstudie ett visar att när arbetsledare använder sig av en hög grad av säkerhetsspecifik återkoppling så ökar deras platschefer denna typ av ledarbeteende. Delstudie två visar att när medarbetare uppvisar en hög grad av regelefterlevnad så ökar deras platschefers aktiva lyssnande. Resultaten indikerar även att ITBS påverkar platschefers ledarskap (delstudie tre och fyra). Ledarträning som innehåller beteendeanalys, målformulering, beteendeträning med beteendespecifik återkoppling, hemuppgifter och vidmakthållandeplan bidrar till att öka platschefers användning av positiv återkoppling och aktivt lyssnande samt ett transformativt och belönande ledarskap.
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| 4. |
- Jonsson, Karin, et al.
(författare)
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Urine cultures from indwelling bladder catheters in nursing home patients: A point prevalence study in a Swedish county.
- 2011
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Ingår i: Scandinavian journal of urology and nephrology. - : Informa UK Limited. - 1651-2065 .- 0036-5599.
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Tidskriftsartikel (refereegranskat)abstract
- Abstract Objectives. To survey the bacterial flora and antibiotic resistance in urinary strains from patients with indwelling bladder catheters residing in nursing homes within a geographically defined region. Material and methods. Urine was sampled for culture from 163 catheter patients (126 men and 37 women) during a 2 week period in March 2010. Susceptibility testing of the isolated bacteria was compared with all urinary strains (n = 9994) from hospitals and primary healthcare in the same geographical area cultured during the first 6 months of 2010 (control group). Results. Bacteriuria was found in 159 of 163 urine samples (98%). Enterococcus faecalis and Escherichia coli were the most common species, one or both being detected in 72% of the urine samples, while Proteus species were found in10% and a single isolate of Providentia species was seen.Strains in the study patients were more resistant to antibiotics than in the control group. Particularly large differences were noted for ciprofloxacinin in E. coli (16.9% vs 7.9%) and for trimethoprim-sulfamethoxazole in E. faecalis (39.1% vs 24.8%). One extended spectrum β-lactamase (ESBL)-producing E. coli was cultured (1.3%), compared with 1.6% in the control group. No vancomycin-resistant enterococci (VRE) or methicillin-resistant Staphylococcus aureus (MRSA) were detected. Conclusions. Proteus mirabilis and Providentia species were rarely isolated, in sharp contrast to previous studies from geriatric hospital wards where they have often been in the majority. The limited incidence of ESBL and the absence of VRE and MRSA is gratifying, but the high resistance to antibiotics needs to be assessed on a continuous basis.
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| 5. |
- Jonsson, Lena Margareta, et al.
(författare)
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Dynamic and initial head loss in full-scale wastewater filtration and measures to prevent long-term initial head loss
- 2022
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Ingår i: Water practice and technology. - : IWA Publishing. - 1751-231X. ; 17:7, s. 1390-1405
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Tidskriftsartikel (refereegranskat)abstract
- Dual media sand filters at Henriksdal WWTP began to show high head loss after five years of operation, especially during the fluidization for sorting the filter bed after backwashing. At that time, the filters were still clean and the dynamic head loss, due to clogging of the filters with suspended solids during a cycle of operation, had its lowest value. Dynamic head loss over the lower sand layer surface in the dual media sand filter was detected in some filter cycles of operation. The initial head loss in the filters has increased over the years. This type of head loss is constant during a cycle of operation and increases only slowly with time. It is due to different factors, as precipitation of ferric oxide hydroxide in the nozzle slots and on the grains in the filter bed, and accumulation of filter bed grains below the filter bottom. Different measures were tested to reduce or eliminate the initial head loss in the filters. Results from frequency diagrams showed that changing nozzles and removing of filter bed material from below the filter bottom were the most favourable actions. Backwashing more frequently and with more sequences also reduced the initial head loss.
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| 6. |
- Jonsson, Lena Margareta, et al.
(författare)
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Dynamic head loss in pilot-and full-scale wastewater sand filtration with phosphorus removal, denitrification, and associated bumping
- 2023
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Ingår i: Water practice and technology. - : IWA Publishing. - 1751-231X. ; 18:6, s. 1556-1575
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Tidskriftsartikel (refereegranskat)abstract
- Limitations of the operation of down-flow sand filters were investigated without and with dosages of methanol, ethanol, or acetate for denitrification and dosages of ferrous sulphate to remove phosphorous. The dynamic head loss was developed due to clogging by suspended solids (SS) that originated from the secondary sedimentation tanks including sludge overflow and from SS in primary settled wastewater that bypassed the biological step. The dynamic head loss was also developed from clogging by gas bubbles formed during denitrification, not by the SS produced from cell growth. The dynamic head loss in sand filters after 24 h operation without and with denitrification increased by 0.9–1.3 and 2.3–2.4 mH2O, respectively. The total time of operation was prolonged by 50% after one water bumping, by 75% after two bumpings, and by 85% after six or seven bumpings. Operational time for filter cycles was prolonged by 4–5 h by one bumping in the full-scale and pilot-scale filters. The time of operation depended on hydraulic loading. With a carbon source dosage, one filter cycle lasted 20–40 h at 10 m/h and 60 h at 5 m/h in pilot-scale filters, and 15–27 h at 3.3 m/h in full-scale filters.
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| 7. |
- Jonsson, Lena Margareta, et al.
(författare)
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Multivariate methods in modelling the removal of nitrogen and phosphorus in deep-bed two-media down-flow sand filters
- 2023
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Ingår i: Water practice and technology. - : IWA Publishing. - 1751-231X. ; 18:1, s. 68-85
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Tidskriftsartikel (refereegranskat)abstract
- Multiple linear regression (MLR) was applied to study the operation and efficiency of simultaneous denitrification with sodium acetate (NaAc) as a carbon and energy source and the chemical precipitation of phosphate with iron salts in a pilot sand filter. Different loads were simulated with the addition of primary settled wastewater (PW) containing suspended solids (SS) and biological SS from the aeration tank. SS from PW partly passed the filter. Biological SS was caught by the filter. The validation of the model showed that phosphorus concentration and chemical oxygen demand reduction were easier to predict correctly than the time of operation of the filter. The reduction of total phosphorus differed between 0.01 and 0.31 mg P/L, and the nitrate concentration in the filtrate differed between 0 and 5.2 mg N/L when comparing the experimental values with the model. Experiments showed filtrate concentrations of 0–0.12 mg PO4-P/L, 3.0–8.8 mg NO3-N/L, and 1.9–34 mg SS/L. The addition of NaAc gave a small increase in the reduction of PO4-P probably because of the assimilation of PO4-P into the denitrifying sludge. The dosage of Fe gave a small decrease in the reduction of NO3-N probably because of PO4-P limitation for denitrifying bacteria, as Fe acts as a precipitation agent upon PO4-P.
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| 8. |
- Jonsson, Thomas, et al.
(författare)
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Limb ischemia after EVAR : an effect of the obstructing introducer?
- 2008
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Ingår i: Journal of Endovascular Therapy. - Phoenix, AZ : International Society of Endovascular Specialists. - 1526-6028 .- 1545-1550. ; 15:6, s. 695-701
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Tidskriftsartikel (refereegranskat)abstract
- PURPOSE: To evaluate the splanchnic and limb metabolic effects of open repair (OR) of abdominal aortic aneurysms (AAA) versus endovascular aneurysm repair (EVAR) in a pilot study utilizing microdialysis. METHODS: Nine AAA patients (8 men; mean age 74 years, range 61-85) were treated with EVAR and 9 had an OR (5 men; mean age 70 years, range 55-85). In the EVAR cases, which were performed percutaneously, the external iliac artery was obstructed by the introducer to a mean functional stenosis of 70% (52%-100%). Catheters for microdialysis were placed subcutaneously above the ankle of the right leg and freely in the abdominal cavity to measure the levels of lactate and pyruvate. The lactate/pyruvate ratio was calculated as a measure of ischemia. Measurements started at the end of surgery and continued for 2 days. Mean values were compared using the Mann-Whitney U test. RESULTS: The mean value of intraperitoneal lactate during the first day after EVAR was 1.5+/-0.7 mM versus 2.6+/-0.8 mM after OR (p = 0.019). The lactate/pyruvate ratio was 10.2+/-2.2 after EVAR and 12.3+/-2.6 after OR (p = 0.113). Leg lactate mean values were 4.2+/-2.0 mM after EVAR versus 1.8+/-0.6 mM after OR (p<0.001). The lactate/pyruvate ratio was 20.1+/-8.3 for EVAR and 13.7+/-3.3 for OR (p = 0.040). These differences between EVAR and OR continued for the second day. CONCLUSION: Intraperitoneally, metabolism was slightly increased after OR; however, it was not suggestive of splanchnic ischemia. Leg findings reflected a more extensive ischemia after EVAR over 48 hours, which was a somewhat unexpected finding that may be related to the introducer's impact on blood flow to the limb during the intervention. Although no clinical consequences were recorded, the finding suggests some benefit of minimizing as much as possible the time of reduced perfusion to the limb.
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| 9. |
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