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182 Uppsatser om Plain bearing - Sida 9 av 13
Säsongsvis avverkning : det operativa traktvalets påverkan på den säsongsmässiga uthålligheten i ett bolagsdistrikts traktbank
Due to soft grounds in combination with seasonal variation in soil humidity, there is a lack of stands that are possible to cut during spring and autumn in some geographical regions. For Holmen Skog this sometimes means that a large proportion of the contracted private forest is cut during the winter when the ground is frozen. One consequence of this is that the proportion of winter stands in the stand bank of own forest increases while spring and autumn stands becomes a scarcity. This in combination with milder winters, especially when there is a long period of reduced bearing capacity in spring or autumn, means that the situation rapidly can become critical.
The overall goal with this study was to generate basic data for decision support in the work to achieve a sustainable distribution between own forest and contracted private forest in the stand bank.
The study took place at Holmen Skog, district of Umeå, during autumn 2007 and was based on interviews and an analysis of harvest planning and delivery data.
The study showed that there is a problem with how the cutting is distributed between own and contracted private forest during the year and that it foremost is the proportion of winter thinning of own forest that has increased in the stand bank.
Klotter och skadegörelse på en högstadieskola: en miljöpsykologisk fallstudie med fokus på fysisk miljö.
The purpose of this study was to examine and try to understand the physical environment focusing on the fenomena of scribble and damage at a high school. More specifically its aim was to find out how the pupils themselves discribe their physical environment, the reasons why there are scribble and damage at their school and how they are treated by the adults at the school bearing in mind the scribble and damage that occur. The study took place at one high-school in the southern of Sweden and the methods used were six qualitative interviewes, a minor inquiry in six classes, fotographing the physical environment and putting up scribble boards on the pupils' toilets. The physcial environment was quite bare and monoton and the pupils often felt bored by it. There were few places where the pupils liked being at.
Konstruktion av säkerhetslagerför svänghjul
This thesis is the result of the investigation and solution of a mechanicalproblem regarding flywheel malfunctions. A flywheel is, in short, a devicethat relies on a rotating object?s moment of inertia to store energy overshort time spans. This project is part of the development of a fourthflywheel prototype at the division for electricity at Uppsala university,which uses magnetic levitation to keep a hollow cylinder rotating at veryhigh speeds inside a vacuum chamber. Should the magnets fail however, orsome other error occur that leads to an uncontrolled state of rotation, thecylinder needs to be stabilized mechanically by a device usually referredto as ?back-up bearing?.
Höga trähus : Befintliga trähusproducenters förutsättningar och intresse att bygga flerfamiljshus med bärande trästomme med fler än två våningar
Syftet med uppsatsen är att undersöka befintliga trähusproducenters förutsättningar och intresse att bygga flerfamiljshus med bärande trästomme med fler än två våningar. För att nå vårt syfte har vi satt oss in i marknaden för höga trähus. Detta har vi gjort genom att initialt betrakta dels marknaden ur olika intressenters perspektiv, dels genom att undersöka företagen som finns på marknaden idag och placera in deras respektive byggsystem i en produktlivscykel. Vi har därefter satt oss in i marknaden för trähus och fokuserat på tio företag som vi har djupintervjuat. Vi beskriver sedan de samband vi ser mellan förutsättningarna på marknaden för höga trähus och intervjuresultaten.
Rotningsstimulerande effekt och kemisk analys av vattenbaserad extraktion av vedartade och örtartade skott av Salix smithiana Willd. :
Cuttings of Lonicera xylosteum L. were treated with willow extract to study the response in rooting capacity. The extracts were prepared by mixing chopped pieces of Salix x smithiana Willd. with water in a warring blender. The investigation comprised 2 types of salix extracts based on differences and dynamics between twigs in winter dormancy and twigs with new shoots.
To explore the rooting response, three tests were made.
Bemästra, bistå eller både och? : En kritisk studie av Provincial Reconstruction Teams roll och agerande i Afghanistan
The specific task of this thesis is to illustrate the complexity of a cooperation between civilian and military entities by examining Provincial Reconstruction Teams (PRTs) and their role as an actor among others in the field in a war-torn Afghanistan.By using counterinsurgency strategy as an analytical framework it has been possible to examine the civilian and military contexts closer. Underlying structures concerning the norms and interpretation of reality of the PRTs has been partly revealed. Studies of the PRTs as one significant bearers of "the comprehensive approach", which includes a holistic approach regarding the use of civilian and military capabilities, new conclusions can be drawn on whether a general civil-military approach can be a part of the solution for current and future conflicts. Based on the counterinsurgency strategy, the author has identified three themes as bearing and thus appears through the thesis as a foundation. These are Coordination, Development and Security.
Likviditetspremiens vara eller icke vara - Om likviditetspremiens existens på Stockholmsbörsen
Background: Operating on the stock market is associated with risks. If a particular asset is not traded with the same frequency as the average market asset, this particular asset is exposed to a liquidity risk. It means that the investor might not be able to sell the asset at a desired time without incurring expensive transaction costs. The query is whether or not the investor is compensated with a liquidity premium for bearing the extra risk. Earlier studies on the Stockholm Stock Exchange have failed to prove that there is a relation between stock return and liquidity.
Konstruktion av truckmonterad hjulhanterare
GBD-Storage Systems is a company that provides the industries with products for efficient storage.The company produces pallet racks and accessories like cassettes and extending units. The companyhas also supplied tire racks for a number of tire companies. The company's CEO Gunnar Berglund hasfor some time had an idea to improve the working situation of the workers on tire firms by allowingthe wheels to be handled by a counterbalance truck. The current situation poses numerous heavy liftswhen the tires are handled and therefore is hurting the workers.This thesis has been aiming at helping the GBD-Storage Systems by developing a concept of howan accessory to counterbalanced trucks can be designed to cope with the wheels. This concept willthen be produced as prototype by the company.
Genusbias i suicidprevention - en litteraturbaserad studie
Introduction: Suicide is a major public health problem both internationally and in Sweden. Itis known in research that sex and gender have a bearing on the incidence of suicide andattempted suicide. Gender Bias in medical research could lead to medical errors and to thatthe problem is made invisible. That is why it is important to identify and eliminate them. AimThe purpose of this paper was to examine whether there is gender bias in scientific articlesdealing with suicide prevention interventions and how this is expressed.
Buskröjning längs skogsbilvägar : en produktivitetsstudie av två kättingslagor
To regularly remove woody vegetation along the roadside of forest roads is an important part of the road maintenance, since the vegetation binds moisture in the road side and, thus, the removal makes the road drying faster with results in improved bearing capacity. Vegetation removal also makes it easier to upgrade the road by material recycling from the ditch and, moreover, the visibility along the road is maintained.The aim of the study was to evaluate what type of chain flail is the best and most cost-effective for removal of different kind of woody vegetation along forest roadsides.Time studies were made on two chain flails when removing woody vegetation in three different classes; easy-, middle- and heavy shrub removal. The studied flails were one light and rather simple flail named Optimal M160 and a heavier and more advanced flail named Slagkraft H210. The removal was made according to Holmen Skogs? specification and the quality of the cleaning was measured by objective belt inventory.The productivity was higher with the heavy flail within all cleaning classes.
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.
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.
Centerpartiet och kärnkraften : En studie av förändring i ett parti
ABSTRACTD Level Essay in Political Science, Autumn Semester 2008 by Mattias Andersson. Tutor: Alf Sundin. ?The Swedish Centre Party and Nuclear Power. A Study of Change in a Political Party?The aim of this essay is to examine the policy of the Swedish Centre Party on nuclear power.
Svinnoptimering VTIS1
The goals of this Bachelors? Thesis were to establish the production loss through the VTIS1 Pasteur at Arla Foods Linköping dairy and then suggest simple but effective solutions to minimize the losses for each production run. If the timeframe allowed it, some of the solutions would be implemented and tested in full production to determine their impact on economic and environmental savings.The very first step of this project was to establish the statistics over what losses there is in the production pipeline through VTIS1, from milk and powders in mixer tanks to finished and packed products in cold storage. Then, when knowing how much product was actually lost and where, those bottlenecks could be pinpointed and examined more closely. At this stage the focus was switched, from the otherwise complicated and broad manufacturing process, to the VTIS1-aggregate, since early data indicated there were quite substantial losses there.In conjunction with this project Arla Foods purchased an absorption photometer-measuring device (OPTEK AS16) that could be inserted straight into the product stream out of VTIS1, allowing real time measurements of its optical density.
Utvärdering av CTI på virkesfordon : ? CTI-projekt Holmen Skog/Örnfrakt 2005-2006
The low bearing capacity of roads during the spring thaw and periods in the autumn leads every year to increases costs for Holmen Skog. To reduce costs and increase accessibility
Holmen Skog decided to install and test a CTI-system. Central tire inflation (CTI) is a system that makes it possible to monitor and vary a vehicle?s tire inflation pressures from the cabin, while the vehicle is in motion. When tire pressures are reduced, the area of the contact surface between the tire and the road increases, thus reducing the ground pressure.
The purpose of this study was to evaluate the CTI-equipped vehicle and analyze if the CTI technology is economical defensible during the thaw 2005.