SwePub
Sök i SwePub databas

  Utökad sökning

Träfflista för sökning "swepub ;lar1:(kau);hsvcat:1"

Sökning: swepub > Karlstads universitet > Naturvetenskap

  • Resultat 1-10 av 5785
Sortera/gruppera träfflistan
   
NumreringReferensOmslagsbildHitta
1.
  •  
2.
  • Kattge, Jens, et al. (författare)
  • TRY plant trait database - enhanced coverage and open access
  • 2020
  • Ingår i: Global Change Biology. - : Wiley-Blackwell. - 1354-1013 .- 1365-2486. ; 26:1, s. 119-188
  • Tidskriftsartikel (refereegranskat)abstract
    • Plant traits-the morphological, anatomical, physiological, biochemical and phenological characteristics of plants-determine how plants respond to environmental factors, affect other trophic levels, and influence ecosystem properties and their benefits and detriments to people. Plant trait data thus represent the basis for a vast area of research spanning from evolutionary biology, community and functional ecology, to biodiversity conservation, ecosystem and landscape management, restoration, biogeography and earth system modelling. Since its foundation in 2007, the TRY database of plant traits has grown continuously. It now provides unprecedented data coverage under an open access data policy and is the main plant trait database used by the research community worldwide. Increasingly, the TRY database also supports new frontiers of trait-based plant research, including the identification of data gaps and the subsequent mobilization or measurement of new data. To support this development, in this article we evaluate the extent of the trait data compiled in TRY and analyse emerging patterns of data coverage and representativeness. Best species coverage is achieved for categorical traits-almost complete coverage for 'plant growth form'. However, most traits relevant for ecology and vegetation modelling are characterized by continuous intraspecific variation and trait-environmental relationships. These traits have to be measured on individual plants in their respective environment. Despite unprecedented data coverage, we observe a humbling lack of completeness and representativeness of these continuous traits in many aspects. We, therefore, conclude that reducing data gaps and biases in the TRY database remains a key challenge and requires a coordinated approach to data mobilization and trait measurements. This can only be achieved in collaboration with other initiatives.
  •  
3.
  • Shafer, Aaron B. A., et al. (författare)
  • Genomics and the challenging translation into conservation practice
  • 2015
  • Ingår i: Trends in Ecology & Evolution. - : Elsevier. - 0169-5347 .- 1872-8383. ; 30:2, s. 78-87
  • Tidskriftsartikel (refereegranskat)abstract
    • The global loss of biodiversity continues at an alarming rate. Genomic approaches have been suggested as a promising tool for conservation practice as scaling up to genome-wide data can improve traditional conservation genetic inferences and provide qualitatively novel insights. However, the generation of genomic data and subsequent analyses and interpretations remain challenging and largely confined to academic research in ecology and evolution. This generates a gap between basic research and applicable solutions for conservation managers faced with multifaceted problems. Before the real-world conservation potential of genomic research can be realized, we suggest that current infrastructures need to be modified, methods must mature, analytical pipelines need to be developed, and successful case studies must be disseminated to practitioners.
  •  
4.
  • Balk, Lennart, et al. (författare)
  • Widespread episodic thiamine deficiency in Northern Hemisphere wildlife
  • 2016
  • Ingår i: Scientific Reports. - : Nature Publishing Group. - 2045-2322. ; 6
  • Tidskriftsartikel (refereegranskat)abstract
    • Many wildlife populations are declining at rates higher than can be explained by known threats to biodiversity. Recently, thiamine (vitamin B-1) deficiency has emerged as a possible contributing cause. Here, thiamine status was systematically investigated in three animal classes: bivalves, ray-finned fishes, and birds. Thiamine diphosphate is required as a cofactor in at least five life-sustaining enzymes that are required for basic cellular metabolism. Analysis of different phosphorylated forms of thiamine, as well as of activities and amount of holoenzyme and apoenzyme forms of thiaminedependent enzymes, revealed episodically occurring thiamine deficiency in all three animal classes. These biochemical effects were also linked to secondary effects on growth, condition, liver size, blood chemistry and composition, histopathology, swimming behaviour and endurance, parasite infestation, and reproduction. It is unlikely that the thiamine deficiency is caused by impaired phosphorylation within the cells. Rather, the results point towards insufficient amounts of thiamine in the food. By investigating a large geographic area, by extending the focus from lethal to sublethal thiamine deficiency, and by linking biochemical alterations to secondary effects, we demonstrate that the problem of thiamine deficiency is considerably more widespread and severe than previously reported.
  •  
5.
  • Damas, Giane Benvinda, et al. (författare)
  • Carbon dioxide reduction mechanism on Ru-based electrocatalysts [Ru(bpy)(2)(CO)(2)](2+) : insights from first-principles theory
  • 2021
  • Ingår i: Sustainable Energy & Fuels. - : Royal Society of Chemistry. - 2398-4902. ; 5:23, s. 6066-6076
  • Tidskriftsartikel (refereegranskat)abstract
    • Solar fuel production through the so-called artificial photosynthesis has attracted a great deal of attention to the development of a new world energy matrix that is renewable and environmentally friendly. This process is characterized by light absorption with enough photon energy to generate conduction electrons, which drive the carbon dioxide reduction to produce organic fuels. It is also common to couple Ru-complex electrocatalysts to form a more efficient and selective hybrid system for this application. In this work, we have undertaken a thorough investigation of the redox reaction mechanism of Ru-based electrocatalysts by means of density functional theory (DFT) methods under the experimental conditions that have been previously reported. More specifically, we have studied the electrochemistry and catalytic activity of the [Ru(bpy)(2)(CO)(2)](2+) coordination complex. Our theoretical assessment supports the following catalytic cycle: (i) [Ru(bpy)(2)(CO)(2)](2+) is transformed into [Ru(bpy)(2)(CO)](0) upon two-electron reduction and CO release; (ii) [Ru(bpy)(2)(CO)](0) is protonated to form the [Ru(bpy)(2)(CO)H](+) hydride complex; (iii) CO2 is activated by the hydride complex through an electrophilic addition to form the [Ru(bpy)(2)(CO)(OCHO)](+) intermediate; (iv) the resulting formic acid ligand is released in solution; and, finally, (v) the CO ligand is reattached to the complex to recover the initial [Ru(bpy)(2)(CO)(2)](2+) catalyst.
  •  
6.
  • Fan, Qunping, 1989, et al. (författare)
  • High-performance all-polymer solar cells enabled by a novel low bandgap non-fully conjugated polymer acceptor
  • 2021
  • Ingår i: Science in China Series B. - : Springer Nature. - 1674-7291 .- 1869-1870. ; 64, s. 1380-1388
  • Tidskriftsartikel (refereegranskat)abstract
    • Anon-fully conjugated polymer as a new class of acceptor materials has shown some advantages over its small molecular counterpart when used in photoactive layers for all-polymer solar cells (all-PSCs), despite a low power conversion efficiency (PCE) caused by its narrow absorption spectra. Herein, a novel non-fully conjugated polymer acceptor PFY-2TS with a low bandgap of similar to 1.40 eV was developed, via polymerizing a large pi-fused small molecule acceptor (SMA) building block (namely YBO) with a non-conjugated thioalkyl linkage. Compared with its precursor YBO, PFY-2TS retains a similar low bandgap but a higher LUMO level. Moreover, compared with the structural analog of YBO-based fully conjugated polymer acceptor PFY-DTC, PFY-2TS shows similar absorption spectrum and electron mobility, but significantly different molecular crystallinity and aggregation properties, which results in optimal blend morphology with a polymer donor PBDB-T and better device physical processes in all-PSCs. As a result, PFY-2TS-based all-PSCs achieved a PCE of 12.31% with a small energy loss of 0.56 eV enabled by the reduced non-radiative energy loss (0.24 eV), which is better than that of 11.08% for the PFY-DTC-based ones. Our work clearly demonstrated that non-fully conjugated polymers as a new class of acceptor materials are very promising for the development of high-performance all-PSCs.
  •  
7.
  • Liu, Yanfeng, et al. (författare)
  • In Situ Optical Spectroscopy Demonstrates the Effect of Solvent Additive in the Formation of All-Polymer Solar Cells
  • 2022
  • Ingår i: Journal of Physical Chemistry Letters. - : American Chemical Society (ACS). - 1948-7185 .- 1948-7185. ; 13:50, s. 11696-11702
  • Tidskriftsartikel (refereegranskat)abstract
    • 1-Chloronaphthalene (CN) has been a common solvent additive in both fullerene- A nd nonfullerene-based organic solar cells. In spite of this, its working mechanism is seldom investigated, in particular, during the drying process of bulk heterojunctions composed of a donor:acceptor mixture. In this work, the role of CN in all-polymer solar cells is investigated by in situ spectroscopies and ex situ characterization of blade-coated PBDB-T:PF5-Y5 blends. Our results suggest that the added CN promotes self-aggregation of polymer donor PBDB-T during the drying process of the blend film, resulting in enhanced crystallinity and hole mobility, which contribute to the increased fill factor and improved performance of PBDB-T:PF5-Y5 solar cells. Besides, the nonradiative energy loss of the corresponding device is also reduced by the addition of CN, corresponding to a slightly increased open-circuit voltage. Overall, our observations deepen our understanding of the drying dynamics, which may guide further development of all-polymer solar cells.
  •  
8.
  • Liu, Yanfeng, et al. (författare)
  • In Situ Optical Studies on Morphology Formation in Organic Photovoltaic Blends
  • 2021
  • Ingår i: Small Methods. - : John Wiley & Sons. - 2366-9608. ; 5:10, s. 1-12
  • Tidskriftsartikel (refereegranskat)abstract
    • The efficiency of bulk heterojunction (BHJ) based organic solar cells is highly dependent on the morphology of the blend film, which is a result of a fine interplay between donor, acceptor, and solvent during the film drying. In this work, a versatile set-up of in situ spectroscopies is used to follow the morphology evolution during blade coating of three iconic BHJ systems, including polymer:fullerene, polymer:nonfullerene small molecule, and polymer:polymer. the drying and photoluminescence quenching dynamics are systematically study during the film formation of both pristine and BHJ films, which indicate that the component with higher molecular weight dominates the blend film formation and the final morphology. Furthermore, Time-resolved photoluminescence, which is employed for the first time as an in situ method for such drying studies, allows to quantitatively determine the extent of dynamic and static quenching, as well as the relative change of quantum yield during film formation. This work contributes to a fundamental understanding of microstructure formation during the processing of different blend films. The presented setup is considered to be an important tool for the future development of blend inks for solution-cast organic or hybrid electronics.
  •  
9.
  • George, Zandra, 1985, et al. (författare)
  • Two-in-one : Cathode modification and improved solar cell blend stability through addition of modified fullerenes
  • 2016
  • Ingår i: Journal of Materials Chemistry A. - : Royal Society of Chemistry (RSC). - 2050-7488 .- 2050-7496. ; 4:7, s. 2663-2669
  • Tidskriftsartikel (refereegranskat)abstract
    • The synthesis of dual purpose modified fullerenes with pyridine-as well as amine-functional groups is reported. Addition of these fullerenes to a polymer : fullerene bulk-heterojunction blend based on a thiophene-quinoxaline donor polymer is found to modify the active layer/cathode interface of inverted solar cells (glass/ITO/active layer/MoO3/Al). In particular the open-circuit voltage of devices is increased from 0.1 V to about 0.7 V, which results in a drastic rise in photovoltaic performance with a power conversion efficiency of up to 3%. At the same time, presence of the functionalised fullerene additives prevents the detrimental formation of micrometre-sized fullerene crystals upon annealing at 140 degrees C. As a result, the device performance is retained, which promises significantly increased thermal stability of the bulk-heterojunction blend nanostructure.
  •  
10.
  • van der Velde, Ype, et al. (författare)
  • Consequences of mixing assumptions for time-variable travel time distributions
  • 2015
  • Ingår i: Hydrological Processes. - : Wiley. - 0885-6087 .- 1099-1085. ; 29:16, s. 3460-3474
  • Tidskriftsartikel (refereegranskat)abstract
    • The current generation of catchment travel time distribution (TTD) research, integrating nearly three decades of work since publication of Water's Journey from Rain to Stream, seeks to represent the full distribution in catchment travel times and its temporal variability. Here, we compare conceptualizations of increasing complexity with regards to mixing of water storages and evaluate how these assumptions influence time-variable TTD estimates for two catchments with contrasting climates: the Gardsjon catchment in Sweden and the Marshall Gulch catchment in Arizona, USA. Our results highlight that, as long as catchment TTDs cannot be measured directly but need to be inferred from input-output signals of catchments, the inferred catchment TTDs depend strongly on the underlying assumptions of mixing within a catchment. Furthermore, we found that the conceptualization of the evapotranspiration flux strongly influences the inferred travel times of stream discharge. For the wet and forested Gardsjon catchment in Sweden, we inferred that evapotranspiration most likely resembles a completely mixed sample of the water stored in the catchment; however, for the drier Marshall Gulch catchment in Arizona, evapotranspiration predominantly contained the younger water stored in the catchment. For the Marshall Gulch catchment, this higher probability for young water in evapotranspiration resulted in older water in the stream compared to travel times inferred with assumptions of complete mixing. New observations that focus on the TTD of the evapotranspiration flux and the actual travel time of water through a catchment are necessary to improve identification of mixing and consequently travel times of stream water. Copyright (c) 2014 John Wiley & Sons, Ltd.
  •  
Skapa referenser, mejla, bekava och länka
  • Resultat 1-10 av 5785
Typ av publikation
tidskriftsartikel (2762)
konferensbidrag (1735)
rapport (369)
bokkapitel (335)
doktorsavhandling (156)
annan publikation (125)
visa fler...
licentiatavhandling (119)
bok (70)
proceedings (redaktörskap) (37)
forskningsöversikt (28)
samlingsverk (redaktörskap) (18)
patent (17)
recension (12)
konstnärligt arbete (7)
visa färre...
Typ av innehåll
refereegranskat (4761)
övrigt vetenskapligt/konstnärligt (808)
populärvet., debatt m.m. (210)
Författare/redaktör
Muntean, Adrian, 197 ... (151)
Taheri, Javid (150)
Kassler, Andreas, 19 ... (148)
Nilsson, Anders G. (139)
Fischer-Hübner, Simo ... (125)
Greenberg, Larry (112)
visa fler...
Brunström, Anna (106)
Brunström, Anna, 196 ... (87)
Blomberg, Lars G (78)
Lindskog, Stefan (75)
Bergman, Eva, 1959- (75)
Calles, Olle (75)
Calles, Olle, 1974- (75)
Fischer-Hübner, Simo ... (74)
Greenberg, Larry, 19 ... (70)
Gericke, Niklas, 197 ... (66)
Kassler, Andreas (64)
Schmitz, Monika (63)
Fornstedt, Torgny, 1 ... (61)
Bergman, Eva (61)
Samuelsson, Jörgen, ... (60)
Herold, Sebastian (58)
van Stam, Jan (58)
Piccolo, John, 1964- (57)
Svensson, Krister, 1 ... (57)
Ahmed, Bestoun S., 1 ... (57)
Volkamer, Melanie (56)
Pettersson, John Sör ... (55)
Zomaya, Albert (54)
Fornstedt, Torgny (54)
Takanishi, A. (54)
Piccolo, John (53)
Persson, Lars-Erik (52)
Watz, Johan, 1977- (52)
Fuchs, Jürgen (52)
Nyberg, Lars (51)
Kavallaris, Nikos I. (51)
Fritsch, Lothar, 197 ... (51)
Moons, Ellen, 1966- (50)
Schweigert, Christop ... (46)
Fredriksson, Odd (45)
Moons, Ellen, profes ... (45)
Brönmark, Christer (44)
Garcia, Johan (44)
Moroz, Sergej (44)
Magnusson, Kjell (43)
Österling, Martin (43)
van Bommel, Jorryt, ... (43)
Eckstein, Rolf Lutz (43)
Samuelsson, Jörgen (43)
visa färre...
Lärosäte
Uppsala universitet (134)
Umeå universitet (84)
Lunds universitet (84)
Linköpings universitet (59)
Chalmers tekniska högskola (59)
visa fler...
Kungliga Tekniska Högskolan (58)
Stockholms universitet (50)
Göteborgs universitet (40)
Örebro universitet (38)
Mittuniversitetet (36)
Jönköping University (29)
Sveriges Lantbruksuniversitet (29)
Linnéuniversitetet (23)
RISE (22)
Mälardalens universitet (16)
Högskolan i Gävle (12)
Högskolan i Skövde (10)
Högskolan Dalarna (10)
Luleå tekniska universitet (9)
Karolinska Institutet (7)
VTI - Statens väg- och transportforskningsinstitut (6)
Högskolan Väst (5)
Södertörns högskola (4)
Blekinge Tekniska Högskola (4)
Röda Korsets Högskola (4)
Högskolan Kristianstad (3)
Naturvårdsverket (2)
Högskolan i Borås (2)
Handelshögskolan i Stockholm (1)
Försvarshögskolan (1)
Naturhistoriska riksmuseet (1)
visa färre...
Språk
Engelska (5347)
Svenska (408)
Tyska (13)
Norska (13)
Danska (1)
Ryska (1)
visa fler...
Italienska (1)
Kinesiska (1)
visa färre...
Forskningsämne (UKÄ/SCB)
Teknik (350)
Samhällsvetenskap (333)
Medicin och hälsovetenskap (65)
Humaniora (57)
Lantbruksvetenskap (56)

År

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.

 
pil uppåt Stäng

Kopiera och spara länken för att återkomma till aktuell vy