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- Ovegård, Mikael
(författare)
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Tekniska lösningar för att undvika oönskad fångst av broskfisk
- 2022
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Den här rapporten sammanställer nuvarande kunskapsläge gällande tekniska lösningar som syftar till att minska oönskad fångst av broskfisk i fiskeredskap. Fokus för rapporten är tekniska lösningar som baseras på broskfiskarnas specifika sinnesorgan och beteenden, samt de fiskeredskap som används inom det svenska yrkesfisket. En systematisk genomgång av vetenskapliga publikationer, avhandlingar och tekniska rapporter utfördes via The Bycatch Management Information System, Web of Science och Google Scholar. Sökning efter litteratur på dessa websidor utfördes med kombinationer av de engelska sökorden; Bycatch, mitigation, deterrents, reduction, sharks, rays och skates, och begränsades till litteratur som publicerats mellan år 2010 och 2021. Utifrån resultatet av sökningarna bedömdes totalt 47 publikationer som relevanta för sammanställningen (9 sammanfattningar och 38 originalpublikationer). Originalpublikationerna katalogiserades i referensbiblioteket Zotero enligt typ av testad stimuli för påverkan på beteende (kemiskt, akustiskt, visuellt, elektromagnetiskt), vilken typ av fiske studien riktade sig mot (trål, garn, krok, bur), typ av experiment som utförts (fältförsök eller i fångenskap), och resultat av studien. Publikationer där testat stimuli gav önskat resultat katalogiserades som "Positiv", publikationer där resultaten var begränsade till en av flera testade arter alternativt en av flera testade lokaler katalogiserades som "Begränsad", publikationer där testad stimuli inte gav önskad effekt på beteende katalogiserades som "Negativ". Resultatet från litteraturstudien visade att det för närvarande inte finns en uppenbar generell teknisk lösning, baserad på broskfiskarnas specifika sinnesorgan och beteende, som skulle kunna användas för att minska mängden oönskad fångst av broskfisk i det svenska yrkesfisket. Den repellerande effekten på fisken som de tekniska lösningarna som analyserades avsåg att skapa, visade sig i samtliga fall endast fungera bara för vissa arter eller under vissa förutsättningar. Givet detta, nuvarande läge i utbredning och abundans av broskfisk i svenska vatten samt oönskade fångster av dessa, så är den åtgärd som sannolikt skulle ge störst positiv effekt för bestånden, istället ett utökat användande av rist i fisket med trål.
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- Abazov, V. M., et al.
(författare)
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Study Z gamma events and limits on anomalous ZZ gamma and Z gamma gamma couplings in pp(-) collisions at root s=1.96 Tev
- 2005
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Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 95:5, s. 051802-
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Tidskriftsartikel (refereegranskat)abstract
- We present a measurement of the Z gamma production cross section and limits on anomalous ZZ gamma and Z gamma gamma couplings for form-factor scales of Lambda=750 and 1000 GeV. The measurement is based on 138 (152) candidates in the ee gamma (mu mu gamma) final state using 320(290) pb(-1) of p (p) over bar collisions at root s=1.96 TeV. The 95% C.L. limits on real and imaginary parts of individual anomalous couplings are vertical bar h(10,30)(Z)vertical bar < 0.23, vertical bar h(20,40)(Z)vertical bar < 0.020, vertical bar h(10,30)(gamma)vertical bar < 0.23, and vertical bar h(20,40)(gamma)vertical bar < 0.019 for Lambda=1000 GeV.
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- Suárez-Almeida, M., et al.
(författare)
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Fluid dynamic analysis of dual fluidized bed gasifier for solar applications
- 2021
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Ingår i: Powder Technology. - : Elsevier BV. - 1873-328X .- 0032-5910. ; 390, s. 482-495
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Tidskriftsartikel (refereegranskat)abstract
- A hydrodynamic model of a dual fluidized bed gasifier (DFBG) is developed and its predictions are compared with measurements of solids flux and pressure profiles from a cold flow model (CFM). Then, the performance of a DFBG gasifier is theoretically analyzed in terms of solids circulation and solids distribution under changes in riser and loop seal aeration, solids inventory and particle size, and a sensitivity analysis is made to delimit the model prediction capability. Furthermore, the model is applied to analyze the effects of key design aspects of DFBG, such as the relative size of riser and gasifier, the connection between both units, the circulation rate of solids and their distribution around the system. The model is further used to extend the DFBG operation with external solar energy carried by heated solid particles, i.e. to design solar DFBG (SDFBG). The analysis is focused on the performance with high solids inventory in the gasifier to increase the char conversion (operation with a large solar share) and the control of solids circulation to meet the heat demand of the gasifier with the availability of solar energy. The operation with large solids inventory in the gasifier requires the size of the gasifier to increase considerably compared to that of the conventional DFBG. The substitution of the connection pipe between the riser and the bubbling bed (current design in commercial DFBG) by a lower loop seal enables better control of the solids circulation, thus, benefiting the solar design.
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- Bak-Misiuk, J., et al.
(författare)
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Creation of MnAs nanoclusters during processing of GaMnAs
- 2009
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Ingår i: Radiation Physics And Chemistry. - : Elsevier BV. - 0969-806X. ; 78, s. 116-119
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Konferensbidrag (refereegranskat)abstract
- GaMnAs layers on (0 0 1)-oriented GaAs substrates were grown by the molecular beam epitaxy (MBE) method. Structural properties of samples processed at up to 920 K under hydrostatic Ar pressure up to 1.1 GPa were investigated by X-ray, secondary ion mass spectroscopy and atomic force microscopy methods. The sign of strain (compressive or tensile) of the GaMnAs layers, related to a creation of MnAs nanoclusters, is found to be dependent on processing conditions and on primary structure defects, whereas it was independent of Mn concentration. An influence of the defects structure in as-grown samples on the strain state of processed GaMnAs layers is discussed. (C) 2009 Elsevier Ltd. All rights reserved.
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- Malek, S, et al.
(författare)
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Modelling future soil chemistry at a highly polluted forest site at Istebna in Southern Poland using the "SAFE" model
- 2005
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Ingår i: Environmental Pollution. - : Elsevier BV. - 0269-7491. ; 137:3, s. 568-573
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Tidskriftsartikel (refereegranskat)abstract
- The multi-layer dynamic model SAFE was applied to the forested catchment istebna (Southern Poland), to study recovery from acidification. Environmental pollution in the area has been historically high. The model uses data from an intensive monitoring plot established in 1999 in a spruce stand, which was planted in 1880. Observations showed that the soil was depleted of base cations. The measured base saturation in 1999 was between 5 and 8% in the different soil layers. Model predictions assuming full implementation of the UNECE 1999 Gothenburg Protocol and present day base cation deposition show that the base saturation will slowly increase to 20% by 2100. Despite large emission reductions, Istebna still suffers from the very high loads of acidifying input during the past decades. Soil recovery depends on future emissions especially on base cation deposition. The recovery will be even slower if the base cation deposition decreases further. (c) 2005 Elsevier Ltd. All rights reserved.
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- Malek, S., et al.
(författare)
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The Equilibrium of Corrugated Plates and Shells
- 2017
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Ingår i: Nexus Network Journal. - : Springer Science and Business Media LLC. - 1522-4600 .- 1590-5896. ; 19:3, s. 619-627
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Tidskriftsartikel (refereegranskat)abstract
- Corrugations are used to stiffen sheet materials and in so doing they increase the bending and torsional stiffness in one direction and reduce the in plane membrane stiffness in the other. In this paper we examine the implications of this for the equilibrium of corrugated plate and shell structures. In particular we show that if the derivation is kept in terms of membrane strain energy then such a structure is statically determinate. As a result, a closed-form solution is obtained for a corrugated shell which is simple to solve numerically and could allow a designer to explore a range of different corrugation patterns and support conditions in the initial stage of design.
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