| 1. |
- Alberoni, Chiara, et al.
(author)
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Ceria doping boosts methylene blue photodegradation in titania nanostructures
- 2021
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In: Materials Chemistry Frontiers. - : Royal Society of Chemistry. - 2052-1537. ; 5:11, s. 4138-4152
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Journal article (peer-reviewed)abstract
- Ceria-doped titania photocatalysts (ceria loading 0.25–5.0 wt%) were synthesized by hydrothermal methods for water remediation. Nanotubes (CeTNTx) and nanoparticles (CeTNPx) were obtained. Ceria doping was applied to tune the electronic properties of nanostructured titania, boosting its photocatalytic activity. CeTNT nanostructures contained anatase as the only titania phase, whereas the CeTNP series consisted of both anatase and rutile polymorphs. The Ce addition induced a decrease in the energy gap, allowing enhancement of visible light harvesting. The photodegradation of methylene blue, MB, in aqueous solution was chosen to study the influence of the morphology and the ceria loading on the photocatalytic response, under UV and solar light. Both CeO2–TiO2 nanoparticles and nanotubes were found to be very active under UV light. The highest MB degradation rates were obtained for the 0.25 wt% CeO2 doping, for both nanotubes and nanoparticles (0.123 and 0.146 min−1, respectively), able to photodegrade completely the dye after 120 min. The two samples are stable after a 3-cycle reusability test. The photo-response under simulated solar light confirmed that doping titania with ceria allows harvesting visible light absorption, enhancing its photoactivity. A maximum efficiency of 85% under simulated sunlight at a degradation rate of 0.054 min−1 was obtained. Transient photoluminescence confirmed that MB acts as a charge scavenger for the composite system. These results pointed out ceria-doped titania nanostructures as a promising class of photocatalysts for the degradation of dyes and other hazardous organic compounds in wastewater.
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| 2. |
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| 3. |
- Tajadura, Ana, 1979, et al.
(author)
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Embodied auditory perception: The emotional impact of approaching and receding sound sources.
- 2010
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In: Emotion. - 1528-3542. ; 10:2, s. 216-229
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Journal article (peer-reviewed)abstract
- Research has shown the existence of perceptual and neural bias toward sounds perceived as sources approaching versus receding a listener. It has been suggested that a greater biological salience of approaching auditory sources may account for these effects. In addition, these effects may hold only for those sources critical for our survival. In the present study, we bring support to these hypotheses by quantifying the emotional responses to different sounds with changing intensity patterns. In 2 experiments, participants were exposed to artificial and natural sounds simulating approaching or receding sources. The auditory-induced emotional effect was reflected in the performance of participants in an emotion-related behavioral task, their self-reported emotional experience, and their physiology (electrodermal activity and facial electromyography). The results of this study suggest that approaching unpleasant sound sources evoke more intense emotional responses in listeners receding ones, whereas such an effect of perceived sound motion does not exist for pleasant or neutral sound sources. The emotional significance attributed to the sound source itself, the loudness of the sound, and loudness change duration seem to be relevant factors in this disparity.
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| 4. |
- Kiriakidou-Kazemifar, Nitsa, et al.
(author)
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Formation of Rhodium Carbonyl Cluster Thiolates with Concomitant H2 evolution
- 2001
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In: Journal of Organometallic Chemistry. - 0022-328X. ; 623:1-2, s. 65-73
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Journal article (peer-reviewed)abstract
- Reaction of [Rh6(CO)15(NCMe)] with p-thiocresol [(4-Me)C6H4SH] leads to the formation of [Rh2(CO)4(μ-SC6H4CH3)2] as the main product along with a small amount of [Rh6(CO)16]. An approximately 30-fold excess of the thiol is required in order to obtain a good yield of the thiolate-bridged dimer while reaction of [Rh4(CO)12] with an excess of p-thiocresol leads to an apparently clean conversion to the dimeric Rh(I) complex. Mass spectrometric measurements show that the latter reaction involves evolution of H2, and CO evolution is indicated by the retardation of the reaction in CO saturated solution; these results suggest the following reaction stoichiometry: [Rh4(CO)12]+4RSH→2[Rh2(CO)4(μ-SR)2]+2H2+4CO. Kinetic measurements show that the reaction proceeds in three stages which are proposed to involve two rapid pre-equilibria and a final irreversible and relatively slow conversion to the products. The crystal and molecular structure of [Rh2(CO)4(μ2-SC6H4CH3)2] is reported.
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| 5. |
- Mittag, Peter Franz, 1966-
(author)
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Roman Medallions : The Sixth Moneytalk in Uppsala (May 7, 2015)
- 2015
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Reports (peer-reviewed)abstract
- Starting with C. Julius Caesar the Roman emperors not only minted coins but – at first only occasionally, since the second century AD more regularly – medallions as well. We do not know how the Romans called these special products of the imperial mint – but most of them obviously differ from normal coins by their technical features, and normally medallions are not found in the same contexts as coins. For that reason they must have served for other purposes than regular coinage. Modern numismatists disagree about the question when, why and for whom they were produced. Before focussing these questions it seems to be helpful to focus at first briefly on technical aspects. In a second step I would like to deal with the question why and when medallions where produced and who were the recipients. In the longer third part I would like to call your attention to some selected medallions that are typical for their time.
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| 6. |
- Ojha, Narendra, et al.
(author)
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Mechanisms and Pathways for Coordinated Control of Fine Particulate Matter and Ozone
- 2022
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In: Current Pollution Reports. - : Springer Science and Business Media LLC. - 2198-6592. ; 8:4, s. 594-604
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Journal article (peer-reviewed)abstract
- Purpose of Review Fine particulate matter (PM2.5) and ground-level ozone (O3) pose a significant risk to human health. The World Health Organization (WHO) has recently revised healthy thresholds for both pollutants. The formation and evolution of PM2.5 and O3 are however governed by complex physical and multiphase chemical processes, and therefore, it is extremely challenging to mitigate both pollutants simultaneously. Here, we review mechanisms and discuss the science-informed pathways for effective and simultaneous mitigation of PM2.5 and O3.Recent Findings Global warming has led to a general increase in biogenic emissions, which can enhance the formation of O3 and secondary organic aerosols. Reductions in anthropogenic emissions during the COVID-19 lockdown reduced PM2.5; however, O3 was enhanced in several polluted regions. This was attributed to more intense sunlight due to low aerosol loading and non-linear response of O3 to NOx. Such contrasting physical and chemical interactions hinder the formulation of a clear roadmap for clean air over such regions.Summary Atmospheric chemistry including the role of biogenic emissions, aerosol-radiation interactions, boundary layer, and regional-scale transport are the key aspects that need to be carefully considered in the formulation of mitigation pathways. Therefore, a thorough understanding of the chemical effects of the emission reductions, changes in photolytic rates and boundary layer due to perturbation of solar radiation, and the effect of meteorological/seasonal changes are needed on a regional basis. Statistical emulators and machine learning approaches can aid the cumbersome process of multi-sector multi-species source attribution.
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| 7. |
- Sainudiin, Raazesh, et al.
(author)
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Rejecting the Null Hypothesis of Apathetic Retweeting of US Politicians and SPLC-defined Hate Groups in the 2016 US Presidential Election
- 2018
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In: 2018 IEEE/ACM International Conference on Advances in Social Networks Analysis and Mining (ASONAM). - : IEEE. - 9781538660515 ; , s. 250-253
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Conference paper (peer-reviewed)abstract
- We characterize the Twitter networks of both major presidential candidates, Donald Trump and Hillary Clinton, with various American hate groups defined by the US Southern Poverty Law Center (SPLC). We further examined the Twitter networks for Bernie Sanders, Ted Cruz, and Paul Ryan, for 9 weeks around the 2016 election (4 weeks prior to the election and 4 weeks post-election). By carefully accounting for the observed heterogeneity in the Twitter activity levels across individuals under the null hypothesis of apathetic retweeting that is formalized as a random network model based on the directed, multi-edged, self-looped, configuration model, our data revealed via a generalized Fisher's exact test that there were significantly many Twitter accounts linked to SPLC-defined hate groups belonging to seven ideologies (Anti-Government, Anti-Immigrant, Anti-LGBT, Anti-Muslim, Alt-Right, Neo-Nazi, and White-Nationalist) and also to @realDonaldTrump relative to the accounts of the other four politicians. The exact hypothesis test uses Apache Spark's distributed sort and join algorithms to produce independent samples in a fully scalable way from the null model.
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| 8. |
- Toftegaard, Ola
(author)
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Textile for the future
- 2008
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In: The Nordic Textile Journal 2008, Special Edition Smart Textiles, p.88-93. - : University College of Borås. The Swedish School of Textiles.
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Journal article (other academic/artistic)
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| 9. |
- Horesh, N, et al.
(author)
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Self-disclosure, depression, anxiety, and suicidal behavior in adolescent psychiatric inpatients
- 2006
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In: Crisis. - : Hogrefe Publishing Group. - 0227-5910 .- 2151-2396. ; 27:2, s. 66-71
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Journal article (peer-reviewed)abstract
- The objectives of this paper were to examine the personality variable of self-disclosure, or the tendency to share feelings with others, and its relationship to depression, anxiety, and suicidal behavior in adolescent psychiatric inpatients. Of the 87 adolescents who were assessed, 53 had made a suicide attempt and 34 had never shown any suicidal behavior during their lifetime. There was a significant relationship between suicidality and low levels of self-disclosure, which appears to be mediated by anxiety and depression. This sharing difficulty was most significantly marked between the adolescent and his/her family and seemed to be mediated by feelings of depression and anxiety.
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| 10. |
- Kiessling, Anders, et al.
(author)
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Alternative protein sources for fish, not competing with the human food demand evaluated by traditional and novel approaches
- 2016
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Conference paper (other academic/artistic)abstract
- At present, most alternative feed sources in fish is since long known in terrestrial animals. However, in a longer time frame this is questionable from a food security perspective, as these sources often are of human food quality. This is an argument rapidly growing in importance. Microbes, insects and products from other forms of extractive aquaculture are of major interest considering their growth potential, nutritional profile, probiotic qualities and ability to use simple resources as substrates. However, with a transition towards a circular economy, substrates that produce such feed ingredients will to a higher degree be based on waste and by-products. This development will demand novel approach in nutrition research in order to understand non-intuitive positive and negative effects in the fish gut biota, immune response, metabolism, welfare and product quality/safety. We will present our ongoing work, concerning physiological implications of alternative protein sources using in situ experimental technologies, such as cannulation and repeated tissue sampling. This work also combines advanced analytic methods of metabolomics and gut microbiota using amplicon next generation sequencing that targets 16S rDNA for bacterial identification. Data on post-prandial plasma AA profile, hematological parameters and erythrocyte indices will be presented together with data concerning the interaction between diet and stress in fish where fishmeal has been replaced by yeast up to 60%. Also, data concerning changes of the microbiota of fish given fungal mycelium-, yeast-, insect- (if ready) and mussel meal will be presented, including comparison between nutrient efficiency of feed given in clear or “green” water environments. Finally, experiments concerning yeast as biological barrier to prions, i.e. food safety, will be discussed. In all, an overall picture of one possible future development in fish nutrition will be painted with a focus on the use of novel feed stuffs in circular food production systems.
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