| 1. |
- Ahlberg, Erik, et al.
(författare)
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"Vi klimatforskare stödjer Greta och skolungdomarna"
- 2019
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Ingår i: Dagens nyheter (DN debatt). - 1101-2447.
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Tidskriftsartikel (populärvet., debatt m.m.)abstract
- DN DEBATT 15/3. Sedan industrialiseringens början har vi använt omkring fyra femtedelar av den mängd fossilt kol som får förbrännas för att vi ska klara Parisavtalet. Vi har bara en femtedel kvar och det är bråttom att kraftigt reducera utsläppen. Det har Greta Thunberg och de strejkande ungdomarna förstått. Därför stödjer vi deras krav, skriver 270 klimatforskare.
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| 2. |
- Johnson, Tomas, 1979, et al.
(författare)
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A Multi-Scale Simulation Method for the Prediction of Edge Wicking in Multi-Ply Paperboard
- 2015
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Ingår i: Nordic Pulp and Paper Research Journal. - 2000-0669 .- 0283-2631. ; 30:4, s. 640-650
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Tidskriftsartikel (refereegranskat)abstract
- When liquid packaging board is made aseptic in the filling machine the unsealed edges of the board are exposed to a mixture of water and hydrogen peroxide. A high level of liquid penetration may lead to aesthetic as well as functional defects. To be able to make a priori predictions of the edge wicking properties of a certain paperboard material is therefore of great interest to the paper industry as well as to packaging manufacturers. In this paper an extended multi-scale model of edge wicking in multi-ply paperboard is presented. The geometric and physical properties of the paperboard are modeled on the micro-scale, and include fillers and fines. The absolute air permeabilities and pore size distributions are validated with experimental and tomographic values. On the macro-scale random porosity and sizing distributions, time and sizing dependent contact angles, and inter-ply dependence are modeled. Arbitrary shapes of the paperboard are handled through an unstructured 3D surface mesh. Stationary and transient edge wicking simulations are validated against experiments with excellent agreement. The simulations show that the diffusive menisci between the liquid and air phases together with the two-ply model is necessary to achieve good agreement with the transient edge wicking experiments.
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| 3. |
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| 4. |
- Martinsson, Johan, et al.
(författare)
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Evaluation of delta C-13 in Carbonaceous Aerosol Source Apportionment at a Rural Measurement Site
- 2017
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Ingår i: Aerosol and Air Quality Research. - : Taiwan Association for Aerosol Research. - 1680-8584 .- 2071-1409. ; 17:8, s. 2081-2094
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Tidskriftsartikel (refereegranskat)abstract
- The stable isotope of carbon, C-13, has been used in several studies for source characterization of carbonaceous aerosol since there are specific signatures for different sources. In rural areas, the influence of different sources is complex and the application of delta C-13 for source characterization of the total carbonaceous aerosol (TC) can therefore be difficult, especially the separation between biomass burning and biogenic sources. We measured delta C-13 from 25 filter samples collected during one year at a rural background site in southern Sweden. Throughout the year, the measured delta C-13 showed low variability (-26.73 to -25.64%). We found that the measured delta C-13 did not correlate with other commonly used source apportionment tracers (C-14, levoglucosan). delta C-13 values showed lower variability during the cold months compared to the summer, and this narrowing of the delta C-13 values together with elevated levoglucosan concentrations may indicate contribution from sources with lower delta C-13 variation, such as biomass or fossil fuel combustion. Comparison of two Monte Carlo based source apportionment models showed no significant difference in results when delta C-13 was incorporated in the model. The insignificant change of redistributed fraction of carbon between the sources was mainly a consequence of relatively narrow range of delta C-13 values and was complicated by an unaccounted kinetic isotopic effect and overlapping delta C-13 end-member values for biomass burning and biogenic sources.
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| 5. |
- Török, Sandra, et al.
(författare)
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Investigation of the absorption Ångström exponent and its relation to physicochemical properties for mini-CAST soot
- 2018
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Ingår i: Aerosol Science and Technology. - : Informa UK Limited. - 0278-6826 .- 1521-7388. ; 52:7, s. 757-767
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Tidskriftsartikel (refereegranskat)abstract
- In this work, a mini-CAST soot generator was used to produce soot with different optical and physicochemical characteristics. Absorption Ångström exponents (AAE) expressing the absorption wavelength dependence were assessed by multiwavelength in-situ and filter-based (aethalometer) laser extinction. The two optical techniques showed good agreement. For the chosen mini-CAST operating conditions, AAEs between 1 and 3.5 were found. Soot with high mass-fractions of organic carbon (OC) and pyrolytic carbon (PC) determined with thermal optical analysis were associated with AAEs significantly higher than 1. Heating to 250 and 500°C removed the majority of polycyclic aromatic hydrocarbons. However, the thermal-optical analysis revealed that OC and PC were abundant in the soot with AAE > 2 also after heating the aerosol. Analysis of mass absorption cross section ratios for elemental carbon and OC indicated that elevated AAEs also after heating to 500°C could be related to persistent OC and PC components and/or the refractory soot. By comparing the mini-CAST soot optical properties with soot properties derived from in-situ extinction measurements in a premixed flame, mini-CAST soot with a higher AAE could be identified as less mature soot.
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| 6. |
- Wejryd, Johan, 1978-
(författare)
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On Consumed Democracy : The Expansion of Consumer Choice, Its Causal Effects on Political Engagement, and Its Implications for Democracy
- 2018
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- This is a thesis about expansions of consumer choice, their causal effects on political engagement, and the democratic implications that follow. For material and ideological reasons alike, consumer choices have expanded over the last decades and are likely to become even more present in citizens’ lives in the future. Scholars’ appraisal of this expansion of consumer choice ranges from, on the one hand, seeing it as a threat to active citizenship to, on the other hand, celebrating it as inherently democratic.The thesis accepts the assumed democratic potential of consumer choice as a means for conveying legitimate political preferences and affecting political outcomes. Yet the introduction shows that, from the perspective of normative democratic theory, citizens’ consumer choices are under most circumstances democratically inferior to civic engagement that addresses formal political decision-making. It is thus a pressing question whether there actually are elements in consumer choices that reduce citizens’ inclination to engage in conventional forms of political participation. This empirical question is addressed in the three essays.The essays tap the effects of consumer choices in different contexts, such as parents’ school choices for their children (Essay I), consumer choices that interact with citizens’ political motivations, i.e. “political consumption,” (Essay II), and consumer choices regarding plainly private consumer goods (Essay III). All the three essays account for causality and do so by means of experimental designs. In addition, the essays are similar in that their results point in the same direction: expansions of consumer choice reduce citizens’ willingness to conventional political participation.Given the democratic significance of conventional participation and the pervasiveness of consumer choice, the results are important both from a scholarly perspective and from a broader societal perspective. The results cast new light on a wide range of issues about the extension of consumer choices and their presence in citizens’ lives, including e.g. decisions about user choice in welfare services and advertising regulation. This thesis does by no means end the discussion about such policies, but demonstrates the significance of a certain outlook: issues about the extension of consumer choice are issues about democratic values.
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| 7. |
- Abarenkov, Kessy, et al.
(författare)
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Annotating public fungal ITS sequences from the built environment according to the MIxS-Built Environment standard – a report from a May 23-24, 2016 workshop (Gothenburg, Sweden)
- 2016
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Ingår i: MycoKeys. - : Pensoft Publishers. - 1314-4057 .- 1314-4049. ; 16, s. 1-15
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Tidskriftsartikel (refereegranskat)abstract
- Recent molecular studies have identified substantial fungal diversity in indoor environments. Fungi and fungal particles have been linked to a range of potentially unwanted effects in the built environment, including asthma, decay of building materials, and food spoilage. The study of the built mycobiome is hampered by a number of constraints, one of which is the poor state of the metadata annotation of fungal DNA sequences from the built environment in public databases. In order to enable precise interrogation of such data – for example, “retrieve all fungal sequences recovered from bathrooms” – a workshop was organized at the University of Gothenburg (May 23-24, 2016) to annotate public fungal barcode (ITS) sequences according to the MIxS-Built Environment annotation standard (http://gensc.org/mixs/). The 36 participants assembled a total of 45,488 data points from the published literature, including the addition of 8,430 instances of countries of collection from a total of 83 countries, 5,801 instances of building types, and 3,876 instances of surface-air contaminants. The results were implemented in the UNITE database for molecular identification of fungi (http://unite.ut.ee) and were shared with other online resources. Data obtained from human/animal pathogenic fungi will furthermore be verified on culture based metadata for subsequent inclusion in the ISHAM-ITS database (http://its.mycologylab.org).
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| 8. |
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| 9. |
- Andersson, Klas, et al.
(författare)
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Learning for the Future? : Effects of ESD on teacher education students
- 2013
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Ingår i: Sustainability. - : MDPI AG. - 2071-1050. ; 5:12, s. 5135-5152
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Tidskriftsartikel (refereegranskat)abstract
- Currently, politicians, university representatives, scholars and leading NGOs share a strong belief in the ability of educational systems to generate positive attitudes to sustainable development (SD) among citizens, with the idea of Education for Sustainable Development (ESD) as perhaps the most apparent expression of this conviction. The aim of this paper is to investigate whether ESD might have the intended effects on teacher education students. More specifically, we account for the results from a panel study on the effects of a course on SD held in autumn 2010 at the University of Gothenburg (n = 323) on teacher education students. The surveys consisted of questions about the students’ concerns about various issues, including issues related to SD, and their attitudes towards SD and views of moral obligations to contributing to SD. The study included a control group (n = 97) consisting of students from the teacher-training programme at University West, which had not and did not include ESD. We find positive effects of ESD on almost all attitudes and perceptions, including e.g., personal responsibility in relation to SD and willingness to contribute to SD, while there is no noticeable effect in the control group. We conclude the paper by discussing the implications of our results for the idea of ESD in teacher training programmes at Swedish higher education institutions.
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| 10. |
- Andersson, Klas, 1975, et al.
(författare)
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Learning for the Future? Effects of Education for Sustainable Development (ESD) on Teacher Education Students
- 2013
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Ingår i: Sustainability. - : MDPI AG. - 2071-1050. ; 5:12, s. 5135-5152
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Tidskriftsartikel (refereegranskat)abstract
- Currently, politicians, university representatives, scholars and leading NGOs share a strong belief in the ability of educational systems to generate positive attitudes to sustainable development (SD) among citizens, with the idea of Education for Sustainable Development (ESD) as perhaps the most apparent expression of this conviction. The aim of this paper is to investigate whether ESD might have the intended effects on teacher education students. More specifically, we account for the results from a panel study on the effects of a course on SD held in autumn 2010 at the University of Gothenburg (n = 323) on teacher education students. The surveys consisted of questions about the students’ concerns about various issues, including issues related to SD, and their attitudes towards SD and views of moral obligations to contributing to SD. The study included a control group (n = 97) consisting of students from the teacher-training programme at University West, which had not and did not include ESD. We find positive effects of ESD on almost all attitudes and perceptions, including e.g., personal responsibility in relation to SD and willingness to contribute to SD, while there is no noticeable effect in the control group. We conclude the paper by discussing the implications of our results for the idea of ESD in teacher training programmes at Swedish higher education institutions.
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