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Sökning: WFRF:(Hagman Cecilia)

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1.
  • Hagman, Anton, 1984-, et al. (författare)
  • ZD – Directional Testing of Paperboard, Using Refined Methods to Revisit Out of Plane Properties
  • 2022
  • Ingår i: TAPPICon 2022 Proceedings.
  • Konferensbidrag (refereegranskat)abstract
    • The ZD-tensile strength is tested by attaching the top and bottom sides of a paperboard to rigid blocks that are pulled apart. In a production laboratory the strength is recorded using a tape as an adhesive. In specialized laboratories a more thorough method is available that also measures the force-displacement curve of the sample. The advanced method involves laminating and gluing the paperboard sample to metal blocks which are mounted in a universal testing machine. In this study the advanced ZD-tensile method was refined by removing the glue step and laminating the paperboard directly to the blocks. The new method was validated against the regular method with adequate results. The limits of the refined method were explored with regards to ZD-strength and paper/paperboard thickness. In an attempt to unify the ZD-tensile and -compressive behaviour of paperboard, samples were laminated and tested in combined compression and tension testing. The compressive properties were compared to non-laminated samples. The laminated samples showed a different behaviour than the non-laminated samples. The flat slope seen in the initial part of the pure compression curve disappeared, replaced by a continuous response passing 0 N. The stiffness in this region resembled the response in tensile testing. 
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2.
  • Hagman, Cecilia, 1983, et al. (författare)
  • Additive Manufacturing of a Removable Partial Prosthesis in Titanium Using Binder Jetting Technology: A Brief Research Report
  • 2022
  • Ingår i: Frontiers in Manufacturing Technology. - : Frontiers Media SA. - 2813-0359. ; 2
  • Tidskriftsartikel (refereegranskat)abstract
    • Objective: The purpose of this study was to measure the surface roughness and compare the fit of a cobalt-chromium selective laser-melted removable partial denture framework and a titanium binder jetting removable partial denture framework. Materials and methods: A design for a removable partial prosthesis framework was made using 3Shape software, and thereafter, one framework was additively manufactured in cobalt-chromium with selective laser melting and one in titanium using binder jetting technology. The weight of the frameworks was measured, and the surface parameters Sa, Sds, and Sdr were measured by white light interferometry. The fit of the frameworks was analyzed using visual inspection and the pressing test. Results: The weight of the frameworks in their post-printed state was 15.66 g and 7.43 g for cobalt-chromium and titanium, respectively. After finishing and polishing, the cobalt-chromium framework’s outer surface showed a high shine and smooth surface, with lower values in the Sa and Sdr parameters. The visual inspection showed gaps in the titanium framework, and the pressing test detected movement greater than 0.5 mm for the same material. Conclusion: The Ti framework showed higher surface roughness and was left with a lackluster finish after polishing. Also, the fit of the Ti framework was not clinically acceptable. The additive manufacturing binder jetting technology for titanium needs improvement or an adjustment of the settings to be used for clinically removable partial dentures. The cobalt-chromium framework manufactured by selective laser melting showed an acceptable clinical fit and surface roughness.
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3.
  • Hagman, Cecilia, et al. (författare)
  • Club cell secretory protein (CC16) in gastric fluid at birth and subsequent lung disease in preterm infants
  • 2018
  • Ingår i: Pediatric Pulmonology. - : Wiley. - 8755-6863. ; 53:10, s. 1399-1406
  • Tidskriftsartikel (refereegranskat)abstract
    • BackgroundClub cell secretory protein (CC16) probably has a role in protecting the lung from inflammation. AimTo evaluate if low levels of CC16 in gastric fluid at birth, reflecting low levels of CC16 in the lung, would be associated with lung inflammation and respiratory morbidity. MethodsA study of 64 infants with mean gestational age 26.1 weeks. CC16 was analyzed in gastric fluid at birth. CC16, pro-inflammatory cytokines, and MMP-9 were analyzed in tracheal aspirate within 24h from birth. ResultsCC16 in gastric fluid increased with gestational age (P=0.033). Lower concentrations of CC16 in gastric fluid at birth were associated with higher concentrations of IL-1 (P=0.028), TNF- (P=0.034), and MMP-9 (P=0.015) in tracheal aspirate. Infants who needed mechanical ventilation at 24 and 72h of age had lower CC16 in gastric fluid than those not ventilated at these ages (P=0.011 and P=0.024, respectively). Lower CC16 in gastric fluid was associated with higher FiO(2) at 6h (P=0.009), higher PaCO2 at 24h (P=0.03), more ventilator days (P=0.012) and more days with supplemental oxygen (P=0.03). Infants who had either died or were still treated with supplemental oxygen at 36 weeks postmenstrual age had lower CC16 in gastric fluid than infants with none of these outcomes (P=0.049). ConclusionA low CC16 concentration in gastric fluid at birth was associated with increased inflammation in the trachea within the first 24h of life and with more need for respiratory support in the neonatal period.
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4.
  • Hagman, Cecilia, et al. (författare)
  • Lung function deficits and bronchodilator responsiveness at 12 years of age in children born very preterm compared with controls born at term
  • 2023
  • Ingår i: Pediatric Pulmonology. - 8755-6863. ; 58:11, s. 3156-3170
  • Tidskriftsartikel (refereegranskat)abstract
    • INTRODUCTION: Very preterm birth is associated with lung function impairment later in life, but several aspects have not been studied. We aimed to comprehensively assess lung function at school age in very preterm infants and term controls, with special emphasis on bronchopulmonary dysplasia (BPD), sex, and bronchodilator response.METHODS: At 12 years of age, 136 children born very preterm (85 with and 51 without BPD) and 56 children born at term performed spirometry, body plethysmography, impulse oscillometry, measurement of diffusion capacity, and multiple breath washout, before and after bronchodilator inhalation.RESULTS: Airway symptoms and a diagnosis of asthma were more common in children born very preterm. These children had more airflow limitation, seen as lower forced expiratory volume in 1 s (FEV1 ) (p < .001), FEV1 /forced vital capacity (FVC) (p = .011), and mean forced expiratory flow between 25% and 75% of FVC (p < .001), and a higher total and peripheral airway resistance compared with term-born controls. There was no difference in total lung capacity but air trapping and lung clearance index were higher in children born very preterm. Diffusion capacity was lower in children born very preterm, especially in those with a diagnosis of BPD. In most other tests, the differences between preterm-born children with or without BPD were smaller than between children born preterm versus at term. Boys born preterm had more lung function deficits than preterm-born girls. In children born very preterm, airway obstruction was to a large extent reversible.CONCLUSION: At 12 years of age, children born very preterm had lower lung function than children born at term in most aspects and there was only little difference between children with or without BPD. Airway obstruction improved markedly after bronchodilator inhalation.
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5.
  • Hagman, Cecilia, et al. (författare)
  • Perinatal inflammation relates to early respiratory morbidity and lung function at 12 years of age in children born very preterm
  • 2021
  • Ingår i: Acta Paediatrica, International Journal of Paediatrics. - : Wiley. - 0803-5253. ; 110:7, s. 2084-2092
  • Tidskriftsartikel (refereegranskat)abstract
    • Aim: Very preterm birth may be associated with lung function impairment later in life. It is not known if this is caused by prematurity per se or by associated perinatal events, such as maternal–foetal inflammation and severity of early neonatal lung disease. We assessed these factors in a prospective cohort of very preterm infants followed from birth to middle school age. Methods: In 71 infants with a gestational age of median 27.4 (range 23.9–31.7) weeks, pro-inflammatory and modulatory cytokines were measured in umbilical cord blood and in arterial blood sampled at 6, 24 and 72 h after birth, and cumulated cytokine concentrations were calculated as area under the curve (AUC). At median 12.6 (range 12.3–13.5) years of age, pulmonary function testing was done in 53 children. Results: There was a positive correlation between days on mechanical ventilation and AUC for IL-6 (p = 0.001), IL-8 (p = 0.015) and IL-10 (p = 0.006). Infants with bronchopulmonary dysplasia (BPD; n = 32) had higher AUC for the cytokines IL-6, IL-8 and IL-10 than those without BPD (all p < 0.01). Higher levels of AUC for IL-6 at birth correlated with lower forced expiratory volume in 1 s (p = 0.030) and lower mean expiratory flow rate between 25 and 75% of forced vital capacity (p = 0.034). Conclusion: Perinatal inflammation, assessed by circulating cytokines in the first three days of life, was associated with BPD and with airway obstruction at 12 years of age.
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8.
  • Jakobsson Bergstad, Cecilia, 1967, et al. (författare)
  • Affective-symbolic and instrumental-independence psychological motives mediating effects of socio-demographic variables on daily car use
  • 2011
  • Ingår i: JOURNAL OF TRANSPORT GEOGRAPHY. - 0966-6923. ; 19:1, s. 33-38
  • Tidskriftsartikel (refereegranskat)abstract
    • An empirical study investigates the extent to which affective–symbolic and instrumental–independencepsychologicalmotives mediate effects of socio-demographicvariables on dailycar use in Sweden. Questionnaire data from a mail survey to 1134 car users collected in 2007 were used to assess the relationships dailycar use as driver or passenger have to sex, household type (single or cohabiting with or without children), and residential area (urban, semi-rural or rural). Reliable measures of affective–symbolic and instrumental–independencemotives were constructed. The results show that households with children use the car more than households with no children, that men make more car trips as drivers than women who use the car as passenger more than men, and that households living in rural areas use the car more than households living in semi-rural areas who use the car more than households living in urban areas. An affective–symbolicmotive partially mediates the relationship between the number of weekly car trips and sex, the instrumental–independencemotive partially mediates the relationships between weekly car use and percent car use as driver and several of the socio-demographicvariables (living in urban vs. rural residential area for both measures; sex and living in urban vs. semi-rural residential area for percent car use as driver). Of several other socio-demographicvariables (age, employment, and income) affecting car use, only the relationship of the number of cars to percent car use as driver was (partially) mediated by the instrumental–independencemotive.
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9.
  • Jakobsson Bergstad, Cecilia, 1967, et al. (författare)
  • Influences of affect associated with routine out-of-home activities on subjective well-being
  • 2012
  • Ingår i: Applied Research in Quality of Life. - : Springer Publishing Company. - 1871-2584 .- 1871-2576. ; 7:1, s. 49-62
  • Tidskriftsartikel (refereegranskat)abstract
    • A survey of a random sample of 1,330 Swedish residents assessed the relationships between affect associated with performance of routine out-of-home activities, mood, and judgments of life satisfaction (cognitive subjective wellbeing, CSWB). Regression analyses showed that sociodemographic variables accounted for most variance in CSWB (7%) and least in mood (2%). In agreement with previous research, CSWB increased with income, employment, and cohabiting with a spouse, and had a U-formed relationship with age. Affect associated with routine activities accounted for more variance than the socio-demographic variables in mood (30%) and in CSWB (13%). Mood partially mediated the effect on CSWB of affect associated with the activities. The results suggest that future policy-related research should consider the possibility that community-provided resources that facilitate performance of routine out-of-home activities would increase life satisfaction
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10.
  • Jakobsson Bergstad, Cecilia, et al. (författare)
  • Subjective Well-Being Related to Satisfaction with Daily Travel
  • 2011
  • Ingår i: Transportation. - : Springer Science+Business Media B.V.. - 0049-4488 .- 1572-9435. ; 38:1, s. 1-15
  • Tidskriftsartikel (refereegranskat)abstract
    • Previous research demonstrates an impact on subjective well-being (SWB) of affect associated with routine performance of out-of-home activities. A primary aim of the present study is to investigate whether satisfaction with daily travel has a positive impact on SWB, either directly or indirectly through facilitating the performance of out-of-home activities. A secondary aim is to determine whether emotional-symbolic or instrumental reasons for car use results in higher satisfaction with daily travel than other travel modes. A survey of a population-based sample of 1,330 Swedish citizens included measures of car access and use, satisfaction with daily travel, satisfaction with performance of out-of-home routine activities, and affective and cognitive SWB. The results confirmed that the effect on affective and cognitive SWB of satisfaction with daily travel is both direct and indirect via satisfaction with performance of activities. Percent weekly car use had a small effect on satisfaction with daily travel and on affective SWB, although fully mediating the effect of satisfaction with performance of the activities. This suggests that car use plays a minor role for satisfaction with daily travel and its effect on SWB. This role may be larger if investigated after a forced reduced car use.
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