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- Kliger, Robert, 1950, et al.
(författare)
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Dynamisk mätning av elasticitetsmodul på stockar - en möjlig sorteringsmetod?
- 2003
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Dynamisk provning av elasticitetsmodul hos sågat virke är en metod som har använts för hållfasthetssortering i Sverige under ett antal år. Denna teknik kan användas ävenför att sortera stockar i olika hållfasthetsklasser. Denna rapport beskriver två försök att mäta elasticitetsmodulen hos stockar. Stockarnas värden jämförs med elasticitetsmodulen hos de från stockarna utsågade reglarna.Det första försöket omfattar 35 stockar av gran uttagna under EU-projektet STUD(1997-2000). Egenfrekvensen hos dessa stockar mättes i timmertraven före sågningoch på reglarna direkt efter sågning. Resultaten visar på ett relativt bra samband mellan egenfrekvenserna hos stockarna och reglarna, R2= 0,50. Det andra försöket omfattade 35 granstockar utvalda på Deromesågen i Halland.Stockarna valdes i tre diameterklasser (16-18 cm, 22-24 cm, >30cm) från VMR klass 2, 3 och 4. Vikten, diametern och längden av dessa stockar uppmättes liksom egenfrekvensen i axiell riktning på 2 olika underlag (marken och med dämpning. Dessa stockar sågades till reglar som senare torkades konventionellt. Efter torkning mättes egenfrekvensen och vikten av de enskilda reglarna. Dessa mätvärden användes för att beräkna elasticitetsmodulen hos stockarna och reglarna. Sambandet mellan elasticitetsmodul på stockarna och på reglarna var bra, R2= 0,58, då stockarna mätts liggande på mark och R2= 0,62, då stockarna mätts på dämpande underlag.Resultaten i denna rapport visar att dynamisk provning kan användas på stock.Dessutom visas ett lovande samband mellan stockens styvhet och styvhet för reglar utsågade från samma stock.
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- Bousquet, Antoine
(författare)
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War
- 2012
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Ingår i: The Wiley-Blackwell Companion to Political Sociology. - Chichester : Wiley-Blackwell. - 9781444330939 ; , s. 180-189
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Bokkapitel (refereegranskat)
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- Howick, Jeremy, et al.
(författare)
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Positive "framing" as a powerful medication for pain : A meta-analysis of randomized trials
- 2016
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Ingår i: European Journal of Integrative Medicine. - : Elsevier. - 1876-3820 .- 1876-3839. ; 8, s. 57-59
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Tidskriftsartikel (refereegranskat)abstract
- Introduction: A growing body of evidence suggests that positive framing–inducing positive expectations about the outcome of treatments can reduce pain symptoms. However there is no pooled estimate of the effect size of positive framing for treating pain. Such an estimate is useful to understand the extent to which positive expectations can enhance usual care.Methods: We extracted data from a recent systematic review of interventions that modified all "context factors" (including but not limited to) inducing positive expectations) in adults suffering from pain. The systematic review concluded that positive expectations were effective, but did not pool the results so no effect size was provided. Two authors independently extracted data from the studies and conducted the analysis. Our primary outcome was patient self-reported pain.Results: 10 randomized trials were eligible for meta-analysis. In the trials with continuous outcomes the standardized effect size was −0.39 (95% confidence interval −0.68 to −0.10, p = 0.009, I2 = 79%), suggesting reduced pain on average in groups in which positive expectations were induced. The effect size was similar in magnitude but was not statistically significant when we excluded studies deemed to have a high risk of bias (standard effect size −0.31, 95% CI −0.65 to 0.02, p = 0.07, I2 = 77%).Conclusion: The effect of inducing positive expectations is comparable to the effects of some pharmacological drugs. However many of the studies had a high risk of bias, and heterogeneity was significant. Future research is warranted including investigating ways to implement this evidence into patient care in an ethical way.
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- Sayyad Khodashenas, Niloofar, et al.
(författare)
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Effect of charge carriers and excitons mobility on transport in an organic solar cell
- 2012
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Konferensbidrag (refereegranskat)abstract
- An organic solar cell model is developed that consists of both excitonic and classical bipolar aspects of solar cells. In order to be compatible with the principle of detailed balance theory we have imported the photon recycling term in our equations. As a result we connected the Shockley-Queisser (SQ) theory to the classical diode theory. This model for excitonic and classical bipolar solar cells can describes the combined transport and interaction of electrons, holes and excitons. For high mobilities our model reproduces the Shockley Queisser efficiency limit. We show how varying the respective mobilities of the different species changes the operation mode of the solar cell path between excitonic and bipolar.
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- De Poli, Silvia, et al.
(författare)
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The drowning-refugee effect : media salience and xenophobic attitudes
- 2017
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Ingår i: Applied Economics Letters. - : Taylor & Francis. - 1350-4851 .- 1466-4291. ; 24:16, s. 1167-1172
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Tidskriftsartikel (refereegranskat)abstract
- We study whether salient media coverage of refugees drowning in the Mediterranean affects individual xenophobic attitudes. We combine a randomized survey experiment - a variant of the classic trolley dilemma' - that implicitly elicits individual attitudes towards foreigners, with variation in interview timing, and find that such issue salience significantly decreases xenophobic attitudes by 2.2 percentage points. Our results thus support the idea that exposure to news describing immigrants as victims (instead of a threat) can significantly affect public opinion and mitigate bias against immigrants.
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