I detta projekt har vi fördjupat oss i en glidlagerkonstruktion som befinner sig i en skruvpress. Skruvpressen kompakterar en okänd massa som är sekretessbelagd. Robustus har ett förslag på överdimensionering av det nuvarande glidlagret. Målet med projektet var att analysera och optimera några glidlager i förhållande till det befintliga glidlagret samt att ta hänsyn till materialval och den miljö som lagret kommer att befinner sig i. Det som analyserna och optimeringen visade var att det befintliga glidlagret hade den bästa geometrin bland alla lösningar men inte det optimala materialet.

This essay concerns the visual trade grading of pine and spruce.In the 1800s developed rules for sorting of wood. The rules used to facilitate the export trade.The terms of the regulatory sorting systems developed in the 1900s. While it still used some of the older terms.The essay deals with how the grading rules affect the use of wood and how the rule work and how the terminology works.Some of the terms used for sorting are O/S, Kvinta, Utskott and A,B,C,D.You sorting by counting the numbers of knots, cracks and other characteristics of each piece of wood.The sawmills have much influence in how the rules developed.Today it is often already determined in the sawmills which uses each piece of wood most have..

At seed-growing the aim is to produce a commodity with high germination capacity, good soundness and purity, and also slight admixture of seeds from other species. The capacity of germination and the vigour of the seeds may become impaired in consequence of mechanical damage, infection of diseases, growth of mould, attacks of vermin, high drying temperature, secret germination, sprouting in the ears etc. The germ belongs to the outer and most unprotected parts of the seed, and consequently this is much exposed. Even quite sound seeds can instantaneously have low capability of germination. It can be due to the fact that the seeds are in rest of germination, i.e.

The Swedish Transport Administration manage nearly 4,000 railway bridges in different condition and age around the country. These bridges is in constant need of maintenance and requires continuous inspections. This thesis is designed as a damage investigation on a single-track railway bridge south of Solvarbo in Säter municipality. The railway bridge is in operation and serves over 10,000 trains a year, everything from speed trains to freight trains. The bridge is built as a beam bridge, simply supported over a road.

The Swedish Transport Administration manage nearly 4,000 railway bridges in different condition and age around the country. These bridges is in constant need of maintenance and requires continuous inspections. This thesis is designed as a damage investigation on a single-track railway bridge south of Solvarbo in Säter municipality. The railway bridge is in operation and serves over 10,000 trains a year, everything from speed trains to freight trains. The bridge is built as a beam bridge, simply supported over a road.

This thesis deals with different methods for measuring moisture-related dimensional changes ofwood. Typically relative humidity is measured to determine if the ambient climate around anobject is harmful to it or not. Values between 40 to 65% RH are recommended for hygroscopicmaterials. To know how a wooden object actually reacts to changes in the surroundingenvironment requires methods that involve the object itself. Because of the wood anisotropy,differences in wood structure, finishes and other restraints, it is not always possible to predict themovements.This paper addresses various measurement methods, primarily methods that have been testedin the field of conservation, with examples of their use.

Efter introduktionen av Eurokoderna har mängden minimiarmering i betongkonstruktioner ökat. Denna ökning beror på skillnader i metoderna som nu används för att beräkna mängden minimiarmering i olika typer av betongkonstruktioner och de som användes tidigare då BKR var den gällande normen. Minimiarmering används i betongkonstruktioner för att omfördela tvångsdeformationer. I detta arbete undersöks om mängden minimiarmering kan minskas utan att dess huvudsakliga funktion går förlorad. I arbetet har ett antal metoder för att beräkna minimiarmering jämförts för att se hur stora skillnaderna i armeringsmängd blir, varför dessa uppkommer och vilka för- och nackdelar som finns med metoderna.

Bakgrunden till denna studie är att företagen Moelven Skog och Valåsen sågverk önskar effektivisera råvaruanvändningen och därmed minska spillet av timmer genom att sänka stötmånen. En sänkning från tio till sju centimeters stötmån har redan implementerats på Valåsen sågverk men man vill nu undersöka om det går att sänka den ytterligare. Genom att genomföra en sådan förändring avser företaget vinna strategiska fördelar såsom volymbesparingar av virke och högre timmerutbyte i jämförelse med konkurrenterna. Syftet med studien är således att undersöka möjligheterna att minska längden på timret från Moelven Skog till Valåsen sågverk genom att sänka stötmånen. Förhoppningen är genom studien skapa en metod som sedan kan användas för att ta fram den ideala stocklängden till samtliga svenska sågverk inom koncernen. Kunskaper som klarlägger timmerhantering från skog till såg har använts tillsammans med kunskap om sprickuppkomst, mätning och kvalitetsbedömning av sågad vara, fördjupning i justerverkets mätutrustning samt teorier om processanalys.

New high strength steels require improved cold rolling techniques. The aim of this degree project was to develop a new and money saving cold rolling technique to manufacture steel strip for saw blades. The work is based on earlier rolling experiments made with a high carbon steel grade at LuCoil Steel AB. The work also focused on the mill requirements to cold roll high strength steels. The results show that LuCoil?s existing cold rolling mill was actually designed for rolling low carbon steel.

The Göta älv-bridge is a welded steelbridge which is located in Gothenburg,it connects the inner city of Gothenburgwith the island Hisingen. Cracks wasdiscovered in the steel in 1999-2000which started an investigation of thebridge to clearify the condition of thebridge. The conclusion was a monitoringsystem based on laser light sent throughan optical fiber.This report describes the bridge, thedamages, the monitoring system and thetraffic on the bridge.Stefan Pup, at Vectura Borlänge was mysupervisor during this work. In myinvestigation the costs of themonitoring system and the costs ofclosing the bridge is compared andevaluated. The biggest investigatingpart is the costs of closing the bridge.The results of my investigations is thatclosing the Göta älv-bridge would cost 1107 300 SEK / day.

Efterbehandling på sprutbetongen skall enligt regelverk som BV-tunnel och Tunnel 2004 ske direkt efter sprutning. Fukthärdning av sprutbetongen behöver tillämpas då den relativa luftfuktigheten understiger 90 % vid betongytan. Fukthärdning skall då utföras så att betongytan ständigt är fuktig, under hela härdningsperioden fram tills att betongen har fått tillräcklig hållfasthet. Då cementet hydratiseras bildas olika kristaller som ger cementmaterialet dess hårdhet och hållfasthet. Med krympning menas här rörelser i betongen som orsakas av vattenavgång i form av avdunstning från betongen och genom kemiska reaktioner i hydratationsprocessen. Syftet med denna rapport har varit att studera effekten av varierande fukthärdning på sprutbetongen.

Efterbehandling på sprutbetongen skall enligt regelverk som BV-tunnel och Tunnel 2004 ske direkt efter sprutning. Fukthärdning av sprutbetongen behöver tillämpas då den relativa luftfuktigheten understiger 90 % vid betongytan. Fukthärdning skall då utföras så att betongytan ständigt är fuktig, under hela härdningsperioden fram tills att betongen har fått tillräcklig hållfasthet. Då cementet hydratiseras bildas olika kristaller som ger cementmaterialet dess hårdhet och hållfasthet. Med krympning menas här rörelser i betongen som orsakas av vattenavgång i form av avdunstning från betongen och genom kemiska reaktioner i hydratationsprocessen.

This thesis is a survey and also an investigation of the different factors that affects the cracking that occurs in the inserts at AB Sandvik Coromants production in Gimo. The work that has been done has focused on two main factors, namely, powder characteristics and pressing parameters.AB Sandvik Coromant produces tools and tooling systems for metal cutting. They have some problems in their production of inserts. The problem is that cracks sometimes occur in the body of the insert, after it´s pressed. In order to investigate this, a preliminary study was made in which production principles were studied.

This is a technical report about cement stabilization in general and the stabilizationprocess during the construction of a warehouse in Halmstad, Sweden in particular and iswritten at the section for economy and technology at Halmstad University incollaboration with NCC Anläggning.NCC encountered variations in compression strength in the stabilized material on the firstwarehouse that they constructed for the company Biltema. In our report we used thestabilization process of the second warehouse for the same company as a reference todetermine what could be done to get a more homogeneous result for future projects.We also looked in to what testing method is the most suitable to determine the result ofthe stabilization.After interviews with people involved in the process and visits on the work site we havecome to the conclusion that the most probable cause to the variations in compressionstrength is segregation in the ballast material. This segregation can occur in severaldifferent occasions in the process such as during the production, transportation andhandling on the work site.Other causes for the variation can be improper compaction, overlapping stabilization insome places and different duration of hardening of the samples that are tested.The best way to do in situ test of the stabilized material is to do seismic investigations asthose are non-destructive tests in comparison to taking core samples and you can discoverany cracks or air bubbles in the material..

This essay ? Discourse and Dissonance ? deals with Mary Shelley?s gothic novel Frankenstein; or, the Modern Prometheus (1818). The focal point is the construction of ?Them and Us?, as defined by scholars such as Stuart Hall, viewed in terms of the following categories: race, gender and family, class, and sexuality. Rather than applying an outside perspective, e.g.