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Search: WFRF:(Andersson Jan)

  • Result 1-10 of 1755
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1.
  • Ahlström, Martin (author)
  • Stand development and growth in uneven-aged Norway spruce and multi-layered Scots pine forests in boreal Sweden
  • 2016
  • Doctoral thesis (other academic/artistic)abstract
    • The use of the selection system has always been a marginal part of Swedish forestry, and so has research about the system under Swedish conditions. However, the interest in Sweden for uneven-aged forest management has increased because of a rising concern for the ecological and aesthetical consequences from use of the dominating rotation forests system, which creates even-aged forest and has clear-cutting as primary harvesting method. In this thesis I have studied the possibilities and limitations of the selection system in Swedish boreal forests. Stand development, ingrowth and volume increment has been studied in both Norway spruce (Picea abies (L.) H. Karst.), and Scots pine (Pinus sylvestris L.) forests. My studies of uneven-aged Norway spruce show that 1) these forests have the capacity to spontaneously create and maintain an uneven-aged stand structure, 2) there is a positive relation between standing volume and volume increment, and 3) there is no clear relation between the level of ingrowth and stand density. My studies of multi-layered Scots pine forests show that 1) a multi-layered stand structure is more likely the result of size stratification and not of continuous ingrowth, 2) There is positive relation between standing volume and volume increment, and 3) that a low stand density is seems required for ingrowth to occur on a sustainable level. The results imply that for boreal Norway spruce forests, a high standing volume would be recommended when the selection system is applied, whereas for boreal Scots pine forest, uneven-aged management should be motivated by other values than stem production, e.g. aesthetical or ecological.
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  • Andersson, Lars Gustaf (author)
  • Två porträtt
  • 2014
  • Book (pop. science, debate, etc.)
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  • Sommarin, Per, et al. (author)
  • Slutrapport FRAME
  • 2017
  • Reports (other academic/artistic)abstract
    • Projektet har genomförts under perioden 2015-11-10 till 2017-02-10. Swerea SWECAST har varit projektägare och haft rollen som projektledare. Projektutförare har varit Swerea SWECAST tillsammans med avdelningen Energisystem på Linköpings universitet. Projektet har finansierats av Energimyndigheten via Järn- och Stålindustrins Energiforskningsprogram – JoSEn. Huvudmålet har varit att ta fram en metod som kan hjälpa företag att identifiera styrkor och brister i hur företaget använder energidata för att involvera och engagera alla medarbetare i företagets energieffektiviseringsarbete. Att på ett bra sätt hantera energidata inom företagets olika organisatoriska nivåer är en av förutsättningarna för att få engagerat och långsiktigt arbete med energieffektivisering. Den framtagna metodens centrala del består av en enkät innehållande frågor och påståenden som grupperas i kategorierna: allmänna frågor, kunskap, visualisering, teknik, mängd, urval och ledning. Enkäten utarbetades med utgångspunkt från sex djupintervjuer med respondenter från olika organisatoriska nivåer på två svenska stålföretag. Enkäten testades sedan genom utskick till alla anställda på dessa företag. Resultatet från enkätutskicket har delgivits fallföretagen. I denna slutrapport presenteras metoden och bakgrunden till metoden. Bifogat finns enkätfrågorna som tagits fram i projektet. Frågepaketet kan anpassas efter företagsspecifika önskemål. Ambitionen är att läsaren efter att ha tagit del av rapporten ska ha fått tillräcklig insyn i metoden för att kunna göra studier i det egna företaget genom att följa metodens olika steg. Användaren är fri att välja verktyg för enkätutskick. För förenklad bearbetning av enkätsvaren rekommenderas dock ett web-baserat verktyg.
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9.
  • Söderström, Mats, et al. (author)
  • Using proximal soil sensors and fuzzy classification for mapping Amazonian Dark Earths
  • 2013
  • In: Agricultural and Food Science. - 1459-6067 .- 1795-1895. ; 22:4, s. 380-389
  • Journal article (peer-reviewed)abstract
    • We tested if hand-carried field proximal soil sensing (PSS) can be used to map the distribution of anthropogenic Amazonian Dark Earths (ADE). ADE soils are rich in archaeological artefacts, nutrients, organic matter and carbon in the very stable form of pyrogenic carbon, also referred to as black carbon or biochar. To test the capacity of PSS to detect signature ADE properties we measured electrical conductivity (ECa), magnetic susceptibility (MSa) and gamma ray data by transect sampling and compared these readings, using fuzzy classification, with datasets on chemical soil properties from a 28 ha large study area located on the Belterra Plateau of the Lower Amazon in northern Brazil. Results indicate that ECa and MSa measurements were good indicators of ADE signatures, but that the gamma radiation sensor was less useful in the deeply weathered soils. PSS and fuzzy classification can be used for rapid field mapping of ADE for both agricultural and archaeological purposes.
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10.
  • Söderström, Torsten, et al. (author)
  • Reduced order models for diffusion systems
  • 2000
  • Reports (other academic/artistic)abstract
    • Mathematical models for diffusion processes like heat propagation, dispersion of pollutants etc., are normally partial differential equations which involve certain unknown parameters. To use these mathematical models as the substitutes of the true system, one has to determine these parameters.Partial differential equations (PDE) of the form beapartial u(x,t)/partial t = L u(x,t)  (eq1.1)eea where L is a linear differential (spatial) operator, describe infinite dimensional dynamical systems. To compute a numerical solution for such partial differential equations, one has to approximate the underlying system by a finite order one. By using this finite order approximation, one then computes an approximate numerical solution for the PDE.We consider a simple case of heat propagation in a homogeneous wall. The resulting partial differential equation, which is of the form (eq1.1), is approximated by finite order models by using certain existing numerical techniques like Galerkin and Collocation etc. These reduced order models are used to estimate the unknown parameters involved in the PDE, by using the well developed tools of system identification.In this paper we concentrate more on the model reduction aspects of the problem. In particular, we examine the model order reduction capabilities of the Chebyshev polynomial methods used for solving partial differential equation.
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  • Result 1-10 of 1755
Type of publication
journal article (905)
conference paper (326)
book chapter (150)
doctoral thesis (119)
reports (94)
other publication (57)
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book (30)
research review (23)
licentiate thesis (19)
review (13)
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Type of content
peer-reviewed (1052)
other academic/artistic (596)
pop. science, debate, etc. (105)
Author/Editor
Chen, A. (11)
Backes, M. (10)
Berge, D. (10)
Lohse, T. (10)
White, R. (9)
Vink, J (9)
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Katz, U. (9)
Bolmont, J (9)
Tluczykont, M (9)
Abdalla, H. (9)
Aharonian, F. (9)
Benkhali, F. Ait (9)
Brun, F. (9)
Devin, J. (9)
Egberts, K. (9)
Fiasson, A. (9)
Fontaine, G. (9)
Funk, S. (9)
Gabici, S. (9)
Giavitto, G. (9)
Glicenstein, J. F. (9)
Grondin, M. -H (9)
Hinton, J. A. (9)
Hofmann, W. (9)
Holler, M. (9)
Horns, D. (9)
Jamrozy, M. (9)
Jankowsky, F. (9)
Katarzynski, K. (9)
Khelifi, B. (9)
Komin, Nu. (9)
Kosack, K. (9)
Lamanna, G. (9)
Lemoine-Goumard, M. (9)
Lenain, J. -P (9)
Lypova, I. (9)
Marandon, V. (9)
Maurin, G. (9)
Moderski, R. (9)
Moulin, E. (9)
de Naurois, M. (9)
Ohm, S. (9)
Ostrowski, M. (9)
Panter, M. (9)
Parsons, R. D. (9)
Quirrenbach, A. (9)
Reimer, A. (9)
Reimer, O. (9)
Renaud, M. (9)
Rieger, F. (9)
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University
Uppsala University (274)
Lund University (232)
Karolinska Institutet (173)
University of Gothenburg (165)
Chalmers University of Technology (120)
Linköping University (119)
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Royal Institute of Technology (105)
Stockholm University (100)
Luleå University of Technology (91)
Umeå University (89)
Linnaeus University (51)
Örebro University (50)
Swedish University of Agricultural Sciences (49)
Jönköping University (35)
Mid Sweden University (34)
RISE (33)
Karlstad University (26)
Malmö University (24)
Södertörn University (21)
University of Borås (21)
Mälardalen University (20)
Högskolan Dalarna (20)
VTI - The Swedish National Road and Transport Research Institute (18)
Kristianstad University College (12)
The Swedish School of Sport and Health Sciences (12)
University of Gävle (10)
Swedish National Heritage Board (9)
Halmstad University (7)
University West (7)
Stockholm School of Economics (7)
Swedish Environmental Protection Agency (7)
University of Skövde (7)
Swedish National Defence College (5)
The Nordic Africa Institute (4)
Swedish Museum of Natural History (4)
Blekinge Institute of Technology (4)
IVL Swedish Environmental Research Institute (4)
Swedish Agency for Marine and Water Management (3)
Marie Cederschiöld högskola (2)
University College of Arts, Crafts and Design (1)
Sophiahemmet University College (1)
Red Cross University College (1)
University College Stockholm (1)
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Language
English (1480)
Swedish (266)
Undefined language (8)
German (1)
Research subject (UKÄ/SCB)
Natural sciences (517)
Medical and Health Sciences (461)
Engineering and Technology (325)
Social Sciences (270)
Agricultural Sciences (50)
Humanities (36)

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