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291 Uppsatser om 3 Selective cutting - Sida 16 av 20
Mekaniserad ungskogsbehandling för röjning och skörd :
Earlier attempts at mechanising pre-commercial thinning have been met with varying degrees
of success. Most attempts have been based on techniques where residual stems are straddled.
Early treatment is essential to limit damage on residual trees. One part of the present study is an evaluation of mechanised pre-commercial thinning using the new Vimek 404R. Vimek 404R is a fairly small machine that permits selective removal of stems, making it potentially suitable also for areas overdue for pre-commercial thinning. The study established the level of performance for the machine, as well as the improvement needed to make it an economically viable option.
Modell för ett integrerat skärgårdsskogsbruk : en fallstudie på Kallsö
The forests in the unique archipelago of the Baltic Sea is housing many and high values. For the resident population, which has a central role in sustaining a living archipelago, the forest can contribute to the outcome. The forest also contributes to turn the archipelago into one of Sweden?s most attractive recreational areas. Furthermore, these forests exhibit very high environmental values, and they are an element in the traditional cultural landscape.
Frigörelse av kvicksilver och metylkvicksilver till bäckvatten under olika perioder efter skogsavverkning :
High levels of Hg in fish in Swedish lakes have been a problem along time in Sweden. The major concern is production and accumulation of the most toxic form of mercury; methyl mercury (MeHg). Consequently, in about half of our 83 000 lakes fish contain concentrations above the recommended limit for human consumption of 0,5 mg mercury per kg fresh weight (most of it in the form of MeHg). Consumption of fish containing too high levels of MeHg may cause problems for both humans and animals.
Three major sources of MeHg in surface waters are: 1) runoff from terrestrial areas, 2) deposition from the atmosphere, and 3) internal production of MeHg in lakes and streams. The aim of this study was to investigate the effect of clear-cutting on the concentration of Hg and MeHg into draining streams.
Avfuktning för återanvändning av processluft
Sammanfattning Projektet som genomförts på uppdrag av och i samarbete med företaget ABB-I-R har innefattat att finna och dimensionera en befintlig avfuktningsenhet tillgänglig på marknaden, eventuellt med viss erforderlig anpassning och modifikation. Vidare har uppgiften innefattat att konstruera en applikation till basenhet Cutting-box Original IV. Slutligen ingick även testkörning och intrimning av framtaget lösningskoncept som en del i uppgiften. Principkonstruktion: Första konstruktionsetappen s.k. principkonstruktion inleds med en, enligt Fredy Olssons modell för produktutveckling, framtagen strukturerad uppgiftsutredning och problemställningsanalys.
Urskogen med de stämpelbleckade gammeltallarna : en skogshistorisk tolkning av Brännlidens naturreservat
People have used forest resources in northern Sweden for different purposes. Before the 20th century the forest was used for many different reasons, but during the past 200 years it has become an industrial raw material. The presence of people in the forest has left different kinds of traces in the forests. One example is culturally modified trees (CMT´s). The aim of this study was to study and document how people have used the forest resources during the last centuries in Brännlidens nature reserve, and what kind of traces this land use has left.
Grundvattenavsänkning vid tunnelbyggnad ? tillämpning Förbifart Stockholm.
Phosphate is a used as a surface treatment method which is used for various purposes in the industry. In this case, phosphate coated wire is used in the processes to achieve a desirable outcome. The reason to why phosphate coated wire is used in the production process is because phosphate acts as an accumulator, where it stabilizes the lubricant on the surface of the wire. Lubrication is important because it plays a major role in the roll quality and characterizes important benefits regarding the outcome.Currently, SKF has to wash away all phosphates residues after extrusion process in an operation called tumbling. The main reason for this is simply because the surface has to be completely free from lubricants and coatings till the next step of process.
Västlänken Analys ur ett tekniskt och ekonomiskt perspektiv.
Phosphate is a used as a surface treatment method which is used for various purposes in the industry. In this case, phosphate coated wire is used in the processes to achieve a desirable outcome. The reason to why phosphate coated wire is used in the production process is because phosphate acts as an accumulator, where it stabilizes the lubricant on the surface of the wire. Lubrication is important because it plays a major role in the roll quality and characterizes important benefits regarding the outcome.Currently, SKF has to wash away all phosphates residues after extrusion process in an operation called tumbling. The main reason for this is simply because the surface has to be completely free from lubricants and coatings till the next step of process.
Avfuktning för återanvändning av processluft
Sammanfattning
Projektet som genomförts på uppdrag av och i samarbete med företaget ABB-I-R
har innefattat att finna och dimensionera en befintlig avfuktningsenhet
tillgänglig på marknaden, eventuellt med viss erforderlig anpassning och
modifikation. Vidare har uppgiften innefattat att konstruera en applikation
till basenhet Cutting-box Original IV. Slutligen ingick även testkörning och
intrimning av framtaget lösningskoncept som en del i uppgiften.
Principkonstruktion:
Första konstruktionsetappen s.k. principkonstruktion inleds med en, enligt
Fredy Olssons modell för produktutveckling, framtagen strukturerad
uppgiftsutredning och problemställningsanalys. Denna beaktar såväl produktens
förhållning till process, omgivning, människa och ekonomi, som sin egen
tekniska livscykel uppdelad i etapperna alstring, framställning, avyttring och
eliminering.
Populationsstruktur och genetisk analys av exteriöra egenskaper hos svensk ardenner :
The purposes of this study were to estimate genetic and phenotypic parameters for conformation traits in Swedish Ardenner, a heavy draught horse, and to investigate the inbreeding status of the population. Additionally, a breeding scheme proposal was created, based on the results achieved in the study.
The data studied were obtained from the Swedish Horse Board and from the Swedish Ardenner Association. The data included 1632 three-year-old horses, mainly mares, and 356 stallions, judged between 1986 and 2005 at conformation shows. The traits studied were type, head-neck-body, legs, walk and trot at hand, total score and height at withers.
Färsk ved till Hallstaviks pappersbruk :
Hallstaviks papermill is an industry plant within Holmen Paper. Hallstavik is a mechanical
mill and produce newspaper and journal paper. During year 2000, Hallstavik used
approximate 1.200 m3f spruce, either as logs or chips from sawmills. Due to that the
production is running continuously the mill also needs raw material at the same rate. At some periods the supply of raw material cannot keep up pace.
GPS- & GIS-användning i drivningsprocessen hos Stora Enso SKog AB :
GPS (Global Positioning system) and GIS (Geographical information system) has been used for planning and inventory in the forest sector for more than ten years. The last years the development has come to equip harvesters and forwarders with GPS and GIS (GIT).
The goal with this study was to reach a basis for decision, how Stora Enso Skog should continue its investment in GPS and GIS in harvesters and forwarders. To reach this basis for decision, possible advantages and benefits, disadvantages and problems in the harvesting process was evaluated. The study was made as an interview study with four harvesting managers and ten machine teams. To secure the quality of the results an interview questionnaire was made before the interviews were done.
The results showed that GIT will make the harvesting managers work easier.
Frågeställningar vid ombyggnation av kontorslokaler till bostäder : Håltagning i plastgjuten betong
Det råder bostadsbrist i Stockholm, en lösning är att bygga nya bostäder. En annan lösning är att nyttja befintliga byggnader som inte används som bostäder, genom att bygga om kontor- och industrilokaler till bostäder. Det som händer är att industriområden flyttas längre ut från de attraktiva bostadsområdena. Ombyggnationer av byggnader med olika lokalkategorier kräver omfattande bearbetning och samarbete mellan flera aktörer såsom stadsplanerare, byggherrar, arkitekter, konstruktörer med flera. Det finns många aspekter att ta hänsyn till vid ombyggnationsprojekt och vårt mål är att belysa några av dessa.Den här rapporten studerar först och främst konstruktörens roll, vad en konstruktör ska tänka på vid en ombyggnation.
Hur expanderar näthandelsföretag?
Internet commerce is nowadays a well known phenomenon. There is awareness that a lot of newly created companies operate their business through the Internet. You can see a tendency where many young people try to establish an Internet business with the hope of success and expansion on today?s fierce market rivalry. To achieve success, companies have to consider factors like business concept, logistic knowledge, future vision, resources and contacts when initializing their business.Having this in mind, we can clarify the purpose with this paper: ?To analyze in what way On-line shopping companies that sell consumer electronics, cell phones and music/entertainment products, have expanded? The paper is based on telephone interviews with three On-line shopping companies.
Zonerat skogsbruk på fastighetsnivå ? effekter på ekonomi och miljö
Det traditionella svenska skogsbruket bygger på ett trakthyggesbruk som tillämpas på största delen av arealen. Generell hänsyn lämnas vid skogliga åtgärder i form av levande och döda träd samt orörda områden. Utöver detta lämnas hela bestånd och nyckelbiotoper. Denna modell har fått kritik för att den skapar ett fragmenterat och variationsfattigt landskap med dåliga förutsättningar för många skogslevande arter att reproducera och sprida sig. Ett alternativ är triadskogsbruk där arealen delas upp i zoner med olika mål.
BI M i förvaltningsskedet med avseende på konstruktion.
Phosphate is a used as a surface treatment method which is used for various purposes in the industry. In this case, phosphate coated wire is used in the processes to achieve a desirable outcome. The reason to why phosphate coated wire is used in the production process is because phosphate acts as an accumulator, where it stabilizes the lubricant on the surface of the wire. Lubrication is important because it plays a major role in the roll quality and characterizes important benefits regarding the outcome.Currently, SKF has to wash away all phosphates residues after extrusion process in an operation called tumbling. The main reason for this is simply because the surface has to be completely free from lubricants and coatings till the next step of process.