| 1. |
- Amann, Peter, et al.
(författare)
-
A dedicated photoelectron spectroscopy instrument for studies of catalytic reactions at pressures exceeding 1 bar
-
Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- Here, we present a new high-pressure x-ray photoelectron spectroscopy system dedicated to probing catalytic reactions under realistic conditions at pressures exceeding 1 bar. The instrument builds around the concept of a “virtual cell” in which a gasflow is directed onto the sample surface creating a local high pressure on top of the sample. This allows the instrument to maintain a low pressure of a few mbars in the main chamber, while simultaneously keeping a local pressure of around 1 bar. Synchrotron radiation based grazing incidence photoemission within ± 5° is used to enhance the surface sensitivity in the experiment. The aperture, separating the high-pressure region from the differential pumping of the electron spectrometer, consists of multiple, evenly spaced, mm sized holes matching the footprint of the x-ray beam on the sample surface. As the photo-emitted electrons are subject to strong scattering in the gas phase and the resulting signal is therefore highly dependent on the sample to aperture distance, the latter is controlled with high precision using a fully integrated manipulator that allows for sample movement with step sizes of 10 nm between 0 and –5 mm with very low vibrational amplitude. The instrumental features allows acquisition of metallic bulk spectra at He pressures up to 2.5 bar and also allows for following C1s spectra under realistic gas mixtures of CO + H2with various temperatures up to 500°C. This capability opens for studies of catalytic reactions in operandi.
|
|
| 2. |
- Amann, Peter, et al.
(författare)
-
A high-pressure x-ray photoelectron spectroscopy instrument for studies of industrially relevant catalytic reactions at pressures of several bars
- 2019
-
Ingår i: Review of Scientific Instruments. - : American Institute of Physics (AIP). - 0034-6748 .- 1089-7623. ; 90:10
-
Tidskriftsartikel (refereegranskat)abstract
- We present a new high-pressure x-ray photoelectron spectroscopy system dedicated to probing catalytic reactions under realistic conditions at pressures of multiple bars. The instrument builds around the novel concept of a "virtual cell" in which a gas flow onto the sample surface creates a localized high-pressure pillow. This allows the instrument to be operated with a low pressure of a few millibar in the main chamber, while simultaneously a local pressure exceeding 1 bar can be supplied at the sample surface. Synchrotron based hard x-ray excitation is used to increase the electron mean free path in the gas region between sample and analyzer while grazing incidence <5 degrees close to total external refection conditions enhances surface sensitivity. The aperture separating the high-pressure region from the differential pumping of the electron spectrometer consists of multiple, evenly spaced, micrometer sized holes matching the footprint of the x-ray beam on the sample. The resulting signal is highly dependent on the sample-to-aperture distance because photoemitted electrons are subject to strong scattering in the gas phase. Therefore, high precision control of the sample-to-aperture distance is crucial. A fully integrated manipulator allows for sample movement with step sizes of 10 nm between 0 and -5 mm with very low vibrational amplitude and also for sample heating up to 500 degrees C under reaction conditions. We demonstrate the performance of this novel instrument with bulk 2p spectra of a copper single crystal at He pressures of up to 2.5 bars and C1s spectra measured in gas mixtures of CO + H-2 at pressures of up to 790 mbar. The capability to detect emitted photoelectrons at several bars opens the prospect for studies of catalytic reactions under industrially relevant operando conditions.
|
|
| 3. |
- Andersson, David, 1979, et al.
(författare)
-
Attitudes to Personal Carbon Allowances
- 2011
-
Ingår i: WORKING PAPERS IN ECONOMICS. - 1403-2465. ; 505
-
Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- A personal carbon allowance (PCA) scheme targets emissions from individual consumption and allocates allowances directly to individuals by dividing the carbon budget on a per capita basis. In this study we analyze the results of a survey sent out to a representative sample of the Swedish population regarding attitudes to a potential PCA scheme. The distinctive design of a PCA scheme is likely to give rise to specific factors affecting individuals‟ attitudes, such as the perceived fairness of the allocation of allowances and corresponding redistribution of wealth, as well as the perceived complexity of the scheme. We perform an ordered probit analysis with attitude to PCAs as the dependent variable, controlling for a number of variables potentially affecting such attitudes. Interestingly, our findings indicate that the most important variable explaining attitudes to the scheme is the perception of respondents that this type of policy instrument seems very complex.
|
|
| 4. |
- Audet, J., et al.
(författare)
-
Forest streams are important sources for nitrous oxide emissions
- 2020
-
Ingår i: Global Change Biology. - : Wiley. - 1354-1013 .- 1365-2486. ; 26:2, s. 629-641
-
Tidskriftsartikel (refereegranskat)abstract
- Streams and river networks are increasingly recognized as significant sources for the greenhouse gas nitrous oxide (N2O). N2O is a transformation product of nitrogenous compounds in soil, sediment and water. Agricultural areas are considered a particular hotspot for emissions because of the large input of nitrogen (N) fertilizers applied on arable land. However, there is little information on N2O emissions from forest streams although they constitute a major part of the total stream network globally. Here, we compiled N2O concentration data from low-order streams (~1,000 observations from 172 stream sites) covering a large geographical gradient in Sweden from the temperate to the boreal zone and representing catchments with various degrees of agriculture and forest coverage. Our results showed that agricultural and forest streams had comparable N2O concentrations of 1.6±2.1 and 1.3±1.8µgN/L, respectively (mean±SD) despite higher total N (TN) concentrations in agricultural streams (1,520±1,640 vs. 780±600µgN/L). Although clear patterns linking N2O concentrations and environmental variables were difficult to discern, the percent saturation of N2O in the streams was positively correlated with stream concentration of TN and negatively correlated with pH. We speculate that the apparent contradiction between lower TN concentration but similar N2O concentrations in forest streams than in agricultural streams is due to the low pH (<6) in forest soils and streams which affects denitrification and yields higher N2O emissions. An estimate of the N2O emission from low-order streams at the national scale revealed that ~1.8×109g N2O-N are emitted annually in Sweden, with forest streams contributing about 80% of the total stream emission. Hence, our results provide evidence that forest streams can act as substantial N2O sources in the landscape with 800×109gCO2-eq emitted annually in Sweden, equivalent to 25% of the total N2O emissions from the Swedish agricultural sector. © 2019 The Authors. Global Change Biology published by John Wiley & Sons Ltd
|
|
| 5. |
- Bastos Lima, Mairon G., et al.
(författare)
-
Large-scale collective action to avoid an Amazon tipping point - key actors and interventions
- 2021
-
Ingår i: Current Research in Environmental Sustainability. - : Elsevier BV. - 2666-0490. ; 3
-
Tidskriftsartikel (refereegranskat)abstract
- The destruction of the Amazon is a major global environmental issue, not only because of greenhouse gas emissions or direct impacts on biodiversity and livelihoods, but also due to the forest's role as a tipping element in the Earth System. With nearly a fifth of the Amazon already lost, there are already signs of an imminent forest dieback process that risks transforming much of the rainforest into a drier ecosystem, with climatic implications across the globe. There is a large body of literature on the underlying drivers of Amazon deforestation. However, insufficient attention has been paid to the behavioral and institutional microfoundations of change. Fundamental issues concerning cooperation, as well as the mechanisms facilitating or hampering such actions, can play a much more central role in attempts to unravel and address Amazon deforestation. We thus present the issue of preventing the Amazon biome from crossing a biophysical tipping point as a large-scale collective action problem. Drawing from collective action theory, we apply a novel analytical framework on Amazon conservation, identifying six variables that synthesize relevant collective action stressors and facilitators: information, accountability, harmony of interests, horizontal trust, knowledge about consequences, and sense of responsibility. Drawing upon literature and data, we assess Amazon deforestation and conservation through our heuristic lens, showing that while growing transparency has made information availability a collective action facilitator, lack of accountability, distrust among actors, and little sense of responsibility for halting deforestation remain key stressors. We finalize by discussing interventions that can help break the gridlock.
|
|
| 6. |
- Birksjö, David, et al.
(författare)
-
The Swedish Innovation Paradox Revisited : A Discussion about Measurement Problems
- 2012
-
Ingår i: Entrepreneurship and innovation networks. - Trollhättan : University West. - 9789197794343 ; , s. 95-110
-
Konferensbidrag (refereegranskat)abstract
- The literature in the field of innovation lacks clear definitions of how to classify different types of innovations and how they are operationalized and measured. This can create problems when innovation policies are developed.Recent responses to the Swedish paradox (Granberg and Jacobsson, 2006; McKelvey et al. 2007) – where investments in knowledge and R&D not in a corresponding manner contributes to innovations and economic growth – states that measurement problems may be the answer to the existence of this paradox. Innovations are often measured by number of patents, patent citations and R&D expenditures.In this paper we primarily focus on the number of patent applications as proxy for innovation to provide better information for decision making and research.The study consists of two empirical parts. One focusing on data covering the Swedish security industry and data on patents applications. The other part is a qualitative study where managers are interviewed about innovativeness within their company. This allows us to find innovations that are not showing in the patent data.Our study showed that major innovations were often introduced from other industries – implemented by large dominating companies – and they were seldom patented. Our quantitative data indicates a lower level of innovation that arguably could be assumed to be the case judging from our qualitative data which includes a number of unpatented innovations. Notwithstanding considerable measurement problems, it seems that the Swedish security industry is characterised by high growth in terms of number of firms but a relatively modest amount of patented innovations. Major innovations have rather come from other industries, or have not been patented and therefore they are not captured in statistics when using patent as a proxy for innovation. This study provides empirics from the Swedish security industry that indicates these claims.With this paper we want to provide a basis for discussion about the use of patent statistics as an indicator of innovation. We also suggest that the usage of patents as a proxy for innovations need to be further discussed and elaborated.
|
|
| 7. |
|
|
| 8. |
- de Schipper, Elles, et al.
(författare)
-
A comprehensive scoping review of ability and disability in ADHD using the International Classification of Functioning, Disability and Health-Children and Youth Version (ICF-CY)
- 2015
-
Ingår i: European Child and Adolescent Psychiatry. - : Springer. - 1018-8827 .- 1435-165X. ; 24:8, s. 859-872
-
Forskningsöversikt (refereegranskat)abstract
- This is the first in a series of four empirical investigations to develop International Classification of Functioning, Disability and Health (ICF) Core Sets for Attention Deficit Hyperactivity Disorder (ADHD). The objective here was to use a comprehensive scoping review approach to identify the concepts of functional ability and disability used in the scientific ADHD literature and link these to the nomenclature of the ICF-CY. Systematic searches were conducted using Medline/PubMed, PsycINFO, ERIC and Cinahl, to extract the relevant concepts of functional ability and disability from the identified outcome studies of ADHD. These concepts were then linked to ICF-CY by two independent researchers using a standardized linking procedure. Data from identified studies were analysed until saturation of ICF-CY categories was reached. Eighty studies were included in the final analysis. Concepts contained in these studies were linked to 128 ICF-CY categories. Of these categories, 68 were considered to be particularly relevant to ADHD (i.e., identified in at least 5 % of the studies). Of these, 32 were related to Activities and participation, 31 were related to Body functions, and five were related to environmental factors. The five most frequently identified categories were school education (53 %), energy and drive functions (50 %), psychomotor functions (50 %), attention functions (49 %), and emotional functions (45 %). The broad variety of ICF-CY categories identified in this study underlines the necessity to consider ability and disability in ADHD across all dimensions of life, for which the ICF-CY provides a valuable and universally applicable framework. These results, in combination with three additional preparatory studies (expert survey, focus groups, clinical study), will provide a scientific basis to define the ICF Core Sets for ADHD for multi-purpose use in basic and applied research, and every day clinical practice.
|
|
| 9. |
- Ekbäck, Erik, et al.
(författare)
-
Training for Awareness, Resilience and Action (TARA) for medical students : a single-arm mixed methods feasibility study to evaluate TARA as an indicated intervention to prevent mental disorders and stress-related symptoms
- 2022
-
Ingår i: BMC Medical Education. - : BioMed Central (BMC). - 1472-6920. ; 22:1
-
Tidskriftsartikel (refereegranskat)abstract
- Background: Medical students have a higher risk for depression, anxiety, stress-related symptoms, burnout, and suicide, and more rarely seek professional help or treatment than the general population. Appeals are being made to address the mental health and resilience of physicians-to-be. The novel program Training for Awareness, Resilience, and Action (TARA) was originally developed to treat depressed adolescents, targeting specific neuroscientific findings in this population. TARA has shown feasibility and preliminary efficacy in clinically depressed adolescents and corresponding brain-changes in mixed community adolescent samples. The present study investigated the feasibility and acceptability of TARA as a potential indicated prevention program for symptoms of depression, anxiety, stress and burnout in Swedish medical students.Methods: We conducted a single-arm trial with 23 self-selected students in their early semesters of medical school (mean age 25.38 years, 5 males and 18 females), with or without mental disorders. All participants received TARA. Self-reported symptoms of depression, anxiety, perceived stress and psychological inflexibility were collected before (T0) and after the intervention (T1). Qualitative data on the participants’ experiences of TARA were collected in focus-group interviews conducted halfway through the program and upon completion of the program. Individual interviews were also conducted 2 years later. Qualitative content analysis was performed.Results: The mean attendance rate was 61.22% and the dropout rate was 17.40%. The Child Session Rating Scale administered after every session reflected an overall acceptable content, mean total score 34.99 out of 40.00. Trends towards improvement were seen across all outcome measures, including the Hospital Anxiety and Depression Scale Anxiety (t = 1.13, p = 0.29) and Depression (t = 1.71, p = 0.11) subscales, Perceived Stress Scale (t = 0.67, p = 0.51) and Avoidance and Fusion Questionnaire for youth (t = 1.64, p = 0.10). None of the participants deteriorated markedly during the intervention. Qualitative content analysis resulted in a main theme labeled: “An uncommon meeting-ground for personal empowerment”, with 4 themes; “Acknowledging unmet needs”, “Entering a free zone”, “Feeling connected to oneself and others” and “Expanding self-efficacy”.Conclusion: TARA is feasible and acceptable in a mixed sample of Swedish medical students. The students’ reports of entering an uncommon meeting-ground for personal empowerment supports effectiveness studies of TARA in this context.
|
|
| 10. |
|
|
