Sökresultat:
2851 Uppsatser om Timber production - Sida 19 av 191
Uttag av energisortiment vid gallring av contorta, ett komplement till konventionell gallring? :
A recommendation for stand treatment of lodgepole pine (Pinus contorta) is, in a scientific point of view, lacking when it comes to harvesting for biomass energy. Within the next decades it is expected that 280 000 hectares of lodgepole pine will have reached thinning age on the domains of Svenska Cellulosa Aktiebolaget (SCA). Due to this the interest has grown rapidly for studying the possibilities of harvesting biofuel assortments already in the first thinning.
In this study the distribution of the biomass within lodgepole pine trees has been studied and taken into account for estimating the proportions of harvested assortments when using different methods of thinning. The methods studied were conventional biofuel-harvesting (with delimbed branches gathered separately from the round wood) and thinning with cutting of round wood and long tops (incl.
Tidsupplösning vid miljövärdering av fjärrvärme : Kontorsbyggnad med solvärmeproduktion - en fallstudie
The demand for environmental assessments on buildings and energy consumption is increasing as well as the energy performance requirements for buildings. At the same time it is increasingly common with self-producers of heat and electricity generation.The main purpose with this master thesis is to investigate how time resolution affects the environmental assessment of energy consumption in office buildings connected to district heating (DH). Environmental assessments were done with both attributional LCA and consequential LCA with system expansion.Fortum´s DH system in Stockholm was analyzed and district heating production was simulated in a Matlab-model. Greenhouse gas (GHG) emissions for the production were calculated. The heat demand of the office Gångaren 16 in Stockholm was simulated in IDA ICE.
En exakt konst: : (Re)produktion och gestaltning av makt och normalitet genom mat och måltider i Virginia Woolfs Mot fyren
The aim of this essay is to analyze how food and meals produce and reproduce values and power relations and how these processes are portrayed in Virginia Woolf?s To the Lighthouse. Using sociological writings in the field of food consumption and production I study the structures that affect our relation to food and eating. This perspective is combined with a phenomenological view, aiming to examine how food is perceived, which is also inspired by queer theories. Using the method of close reading, the theories are applied to Woolf?s work.
Lönsam produktion av stärkelsepotatis : timing och skördeanpassade åtgärder
During the cultivation season there are a several cropping activities to carry out. At what time these activities are carried out is affecting the result and also on the economy of the crop production. As the production costs are high in potato production, it is important to keep an eye on the economy. Profitability is the most important factor in most crop production systems. If the costs are not covered, it is difficult to justify the production.
Kan biologisk mångfald ökas i ett avsatt skogsområde? : skötselplan för Storskogsberget på Holmen skogs marker, distrikt Umeå
The biodiversity of the Swedish forest has degenerated since the beginning of the 19th century when fire suppression and large scale logging first occurred. Together with a changed land use, these actions today have had a negative influence on many forest dwelling species, due to gradual reduction of natural processes, successions and different structures from the forest ecosystem. The Swedish Forest Act, together with different environment certifications, have today encouraged private persons and forest companies, among them Holmen Skog, to work actively to improve nature conservation. The aim of this study was to, by field inventories of already existing nature values, literature studies, recommendations from scientific reports and ecological gap analysis as a basis, make a management plan, for a non-production area, to conserve or improve the prerequisites for biodiversity. ?Storskogsberget? is located in the coastal area of Västerbotten County, 35 km from the city of Umeå.
Simuleringsmodell över Ålö AB
During year 2004 Ålö AB made significant change in their production process. The production of front loaders is nowadays highly automated with short operation times. To be able to control their process in a better way Ålö recently decided that they needed a tool for simulation of their production and to shift patterns. This final thesis started with a pilot study in Ålö?s factory in Brännland.
Förändringsarbete mot en resurssnål tillverkning : Lean production i ett svenskt tillverkande företag
Vilken strategi ett tillverkande företag arbetar efter kan variera och bero på en mängd olika faktorer. En effektiv tillverkning kan bli komplicerad när marknaden efterfrågar allt mer skräddarsydda produkter med varierande egenskaper. För att bemöta denna typ av komplexitet finns en rad strategier och modeller som har fått global spridning. En av dessa strategier är lean production, ett begrepp som vuxit fram utifrån studier genomförda på den japanska tillverkningsindustrin.I denna studie undersöktes varför lean production valdes som styrningsfilosofi i ett svenskt tillverkande företag, vilka förändringar detta inneburit samt vilka åsikter som fanns kring förändringsarbetet. Insamling av empiri har skett genom att genomföra en fallstudie på företaget Trioplast Sifab.
Skogs påverkan på vindkraftsproduktion - en fallstudie av vindkraftverk vid Andersfält.
The purpose of this master thesis is to investigate how nearby forests affect the energy production in wind turbines. To reach the purpose a case study is performed on three wind turbines sited on a field in a north-south line at Andersfält in the municipality of Halmstad, Sweden. Approximately 100 meters south of the southern wind turbine a forest is situated. The case study is divided into three sub studies where the difference in energy production, the affect of the forest and a wind meteorology model, WAsP, is studied. The result show that the forest have a significant influence and that the WAsP-model gives an incorrect result of the energy production in wind turbines sited near a forest..
Livscykelanalys av sex olika fiskodlingssystem : Fiskens miljöpåverkan för konsumtion i Stockholm
This thesis evaluates the environmental performance of six different fish farming systems. The thesis is part of the network group ?Hållbar fiskförsörjning I Stockholms län? (HFFS) which tries to increase the domestic and regional production of fish in Stockholm and move to a more sustainable supply in the Stockholm county. Two of the chosen systems; pangasius from Vietnam and salmon from Norway are delivering a substantial part of the fish consumed in Stockholm today, although they are very different when it comes to system characteristics. One system, arctic char with conventional feed, is produced in a fairly small scale in the north of Sweden, while the three remaining systems are viewed upon as possible options to supply Stockholm with fish in the future.
Riskfaktorer för uppkomst av neurologisk sjukdom vid infektion med EHV-1
During the cultivation season there are a several cropping activities to carry out. At what time these activities are carried out is affecting the result and also on the economy of the crop production. As the production costs are high in potato production, it is important to keep an eye on the economy. Profitability is the most important factor in most crop production systems. If the costs are not covered, it is difficult to justify the production.
Hur kan vi utveckla vårt personliga uttryckssätt med ljud?
This is a bachelor thesis that studies and discuss the question: How can we develop our individual narrative technique with sound design in a Swedish drama production? We have done research and empirical studies. We have analyzed movies to get an idea how we use the sound design in Swedish drama productions today. We have produced a movie that gives sound the biggest part. Key words: Swedish drama production, narrative technique, sound design.
Att upprätta ett konsignationslager ? en best practice
I en mer global och konkurrensutsatt marknad krävs, i allt större utsträckning, att företag väljer att differentiera sig med specifika kundlösningar istället för den enskilda produkten. Genom att, tillsammans med kunden, skapa värde knyter man denna närmare till sig.
Ett konsignationslager är en strategisk lagerlösning för att minska avstånden mellan kund och leverantör samt att minska kedjans totala lagerkostnad.
SCA Timber har begränsad erfarenhet kring konsignationslager. Av den anledningen har det funnits oklarheter kring hur arbetet bör organiseras.
Syftet med studien är att ta fram en best practice för hur SCA Timber ska arbeta med upprättandet av framtida konsignationslager.
Studien är en multipel fallstudie av fyra verksamheter inom SCA och baseras på kvalitativa, semistrukturerade intervjuer med respondenter som varit inblandade i upprättandet av konsignationslager. Det empiriska materialet består av fjorton intervjuer. Studien utgår ifrån ett teoretiskt ramverk bestående av teorier kring projekt, kritiska framgångsfaktorer i projekt och skapandet av nyttjandevärde.
Ledtidsreduktion i en kundorderstyrd produktion
AbstractPurpose ? The purpose of this study is to investigate possible reasons for long lead-time in a customer driven production, and how the lead-time can be reduced. To fulfil the purpose the study has been broken down into two questions.1. Whichfactorsaffectthelead-timeinacustomer-drivenproduction?2.
Energianvändning på Volvo Lastvagnar Tuve
Volvo Trucks is the second largest manufacturer of heavy trucks, with factories in several countries and with around 21 000 employees. At the plant in Tuve, trucks have been built since 1982 and the activity mainly consists of producing side members and to assemble and packing kits of trucks. In 2005, the factory in Tuve launched the ambition to be the first carbon dioxide neutral vehicle factory in the world. This will be implemented by streamlining and investing in renewable energy. The aim of this degree thesis is to map the usage of energy within production, and also to prepare a method to measure key figures (use of energy per produced unit).
Undersökning och förbättringsförslag av timmersorteringsutrustning: SCA Timber Munksunds sågverk
SCA Timber AB Munksunds sågverk har ett stort problem vid anläggningens timmersortering. Problemet består i att den utrustning som kastar av timmerstockarna från sorteringsbanan och som kallas avpuffare, havererar oftare än vad som kan anses vara acceptabelt. Det som gjorts i detta arbete är att de ingående väsentliga detaljerna ritats upp i 3D-CAD och assemblerats till ett system liknande en sektion av den befintliga timmersorteringen. Detta system har sedan exporterats till dynamiksimuleringsprogrammet ADAMS för att där simuleras tillsammans med timmerstockar av aktuella dimensioner. Simuleringen har så långt möjligt utförts med parametrar liknande de som gäller i verkligheten (hastighet, friktion, densitet etc.).