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12363 Uppsatser om Material models - Sida 25 av 825

Konceptstudie av drivmodul till bandskotare med hybriddrift

BAE Systems Hägglunds has a long history of producing high performance terrain tracked vehicles (mostly for military applications), and they are now aiming at developing a tracked forwarder with similar techniques.The forwarder will be of series hybrid type where a diesel engine via a generator will power the motors (one for each drive wheel). Thanks to individually controlled motors and the gentle rubber tracks, this forwarder is calculated to have a considerably higher average speed in the terrain and to be more gentle to the soil. The forwarder with a weight of 11 metric tons and a load capacity of 15 metric tons is specified to have an average working speed of 7-10 km/h, a top speed in terrain of 15 km/h and a top speed on roads of 40 km/h.This master?s thesis aims at developing a conceptual design of the forwarder?s drive module which includes electric motor, gear unit, brake and drive wheel.To investigate if the requirements can be fulfilled a study of the dimensioning loading scenarios has been carried out. The resulting needs regarding the torque has been considered in order to determine the required gear ratios for different motor options.

Centralitet och periferi i det nya Europa : Städer som regionala nav i samarbete och konkurrens

European cities of today are under the challenge to find ways to stay competitive and flourish in a rapidly changing world, where the old patterns of centrality and periphery not necessarily holds true. New and improved communication networks, a changed political geography in Europe, and the globalisation of not only the financial and industrial markets but also to a certain extent the globalisation of people, have all led to great challenges for cities and regions.In a changed spatial reality the classic monocentric models are challenged by newer models of urbanisation. The polycentric urban region is one such model which has been used to describe urban regions like the Randstad in the Netherlands and the Rhein-Ruhr region in Germany. Regions which lack the single dominant central city of the monocentric models of old, and instead shows a high degree of more equal-sized and sometimes more specialised cities in regional cooperation. The polycentric urban region is in that aspect a possible model for how other urbanised regions in Europe may act to be able to position themselves as attractive urban regions and regional hubs in the European urban network.Polycentric urban regions are not a universal solution, though.

?Man vill ju så mycket men man hinner inte? : folkbibliotekariers och personer engagerade i idrottsföreningars uppfattningar om möjligheten till samarbete dem emellan gällande barn och ungdom

The purpose of this bachelor?s thesis is to examine how public librarians and people engaged in sports associations think of the possibility of collaboration between their organizations regarding children and youth and furthermore how they think this collaboration and collaboration in general would or should be practiced. This is done in the light of the increasing necessity of collaboration in today?s information society as well as the view that reading and sports could make a good match. Focus is placed on the libraries? perspective and also on the respondents? perceptions and thoughts.

Analys av nötningsfenomen i pappersbaserat friktionsmaterial för våta kopplingar

Våta kopplingar används i automatiska transmissioner för att överföra vridmoment. De primära komponenterna i en våt koppling är de oljesmorda pappersbaserade friktionslamellerna och separationslamellerna gjorda av stål. Volvo Construction Equipment (Volvo CE) utvecklar och bygger automatiska powershifttransmissioner med våta kopplingar till sina anläggningsmaskiner. Volvo CE och Luleå Tekniska Universitet (LTU) bedriver tillsammans forskning om våta kopplingar som involverar pappersbaserade friktionsmaterial. De två vanligast förekommande materialen i produktion, i detta examensarbete benämnda som material A och B, testades i en testrigg på LTU.

Frekvensreglering i det nordiska kraftsystemet

Svenska Kraftnät is (together with the other transmission system operators of the Nordic power system) responsible for keeping balance between the generated and demanded power in the Nordic power system. Spontaneous load variations and system disturbances, however, lead to power imbalance followed by frequency variations. The frequency deviations can be limited to an acceptable level by the spinning reserve, mainly by hydro power control. But there are also other system properties which have a great influence on the frequency and system stability. The frequency and voltage dependence of the loads have a direct influence on the power balance.

Förändringarna i den tyska familjepolitiken : Ett steg bort från den konservativa välfärdsmodellen?

The purpose of this paper is to analyze the ongoing changes in German family policy. It explores the issue of whether the German welfare state, in this policy field, can still be regarded as a conservative welfare model or rather approaches a more liberal or social democratic model. A qualitative method is used to analyze the material, especially from the German government, including press releases, other public documents and also articles from the political weekly magazines Der Spiegel and Die Zeit. The changes analyzed are the new parental benefit, the expansion of child care, the concept of whole-day schools and the system of joint taxation. The point of departure is Gösta Esping-Andersen?s categorization of three types of welfare states: the social democratic, the conservative and the liberal.

Utveckling av mobiltelefonapplikation för kommunikation i ad-hoc nätverk med Bluetoothteknik

The purpose of this thesis is to develop an application for mobile phones that simplifies communication. The company Doberman wanted to look at possibilities to develop such an application that uses Bluetooth? technol-ogy to communicate in ad-hoc networks. The aim has been an application to run on mobile phones in which you can send messages and files to other devices and also add a user profile with personal information to share with others. The communication will take place in temporary networks created when Bluetooth enabled devices is in range of each other.The market for mobile phones has grown rapidly over the past years and is still growing.

På tu man hand : Pedagogers uppfattningar kring arbetet med elever i behov av särskilt stöd

The purpose of this essay is to describe the organization of the Swedish Animal WelfareAgency during the time it was in operation. The Swedish Animal Welfare Agency was established in 2005 by the government who saw it as necessary in order to strengthen the protection of cruelty to animals in Sweden. However, the agency was shut down already in2007 and its responsibilities as an agency was moved back to the government and the department of agriculture. During its time in operation, the Swedish Animal Welfare Agency, received much criticism, among other things because of its interpretations of the law which were seen as too focused on details and thus ?bureaucratic?.

"Vi tar lite här och lite där" : Om material och arbetssätt för språklig medvetenhet i förskoleklass

Syftet med vårt examensarbete var att få en inblick i vilket eller vilka material och arbetssätt som används kring språklig medvetenhet i förskoleklass. Vi ville också få kunskap om vad pedagogerna grundar sina val av material och arbetssätt på. Att få en fördjupad förståelse för speciallärares och specialpedagogers roll i arbetet kring språklig medvetenhet var även något vi ville uppnå. Genom 11 semistrukturerade intervjuer med 11 förskollärare, 2 speciallärare och 1 specialpedagog samlade vi in det material som gav oss underlag till analys och diskussion kring frågorna. Samtliga informanter angav att de använde sig av ett eller flera material och de som främst användes var: Trulle, Bornholmsmodellen samt Språk- och mattelekar med Mamma Mu.

Kristen ortodoxi i svenska läroböcker : En analys av framställningen av ortodoxi i fyra läroböcker innan den nya läroplanen. LGR11 och GY11 och fyra efter

The purpose of this study was to gain understanding of orthodox Christianity in Swedish educational material. The aim was to compare the presentation of orthodox Christianity towards pupils before the new curriculum and after. With the help of an analytical approach by Bergström and Boreu ?s and the interpretation strategy by Quentin Skinner, I have studied material used in school for the subject religion. I have limited my educational material in one way.

Den skogliga informationens roll i ett kundanpassat virkesflöde : en bakgrundsstudie samt simulering av inventeringsmetoders inverkan på noggrannhet i leveransprognoser till sågverk

This MSc thesis is divided into two parts. The first part deals with the need for information from forest campartments selected for clear cutting, in connection with planning in an integrated forest- and sawmill enterprise. A review of literature is followed by a case stud y, where present conditions in a Swedish forest company are compared with current research in the area. The seeond part consists of a simulation stud y, which aims at camparing the accuracy of inventory estimates using different methods. The estimates are delivery forecasts, covering one month consumptian of timber in a large sawmill.

Att leda p? distans och p? plats - En kvalitativ studie om chefers f?ruts?ttningar att ut?va ledarskap p? distans och p? plats

This study aims to explore managers? experiences and perceived conditions for exercising leadership in both hybrid and physical work environments. The empirical material consists of eleven semi-structured interviews and four policy documents. The sample includes eleven managers, of whom six work in a physical environment and five in a hybrid setting. The study follows an inductive approach, where the interviews were first collected and later analyzed by identifying patterns and connecting them to theories on different leadership styles, monitoring, and trust.

Mobilannonsering: Hur ett värdenätverk formas kring en ny mediekanal

Mobile telecom and the Internet are converging, which opens new possibilities for market actors to create business through the mobile handset. At the same time market experts are predicting that mobile operator?s existing dominance in the telecom market will in the future decline as new technology such as VoIP and services will erode the operator?s traditional revenue model. This implies that mobile operators will need to rethink their dominant business logic to create new value for their customers. Mobile operators are aiming to expand their existing revenue model through advertising in the mobile handset and are searching to create new business models that evolve advertising sales.

"Ett språk är vad de 'infödda' säger, inte vad någon tycker att de bör säga" : Autentiskt material kontra läroböcker i språkundervising

Detta examensarbete visar resultatet av en undersökning om hur språklärare i engelska, franska och tyska på gymnasieskolan använder sig av autentiskt material i undervisningen och hur de tror att detta påverkar eleverna.En kvalitativ forskningsmetod har använts och därefter har resultaten analyserats med ad hoc-metoden.Resultaten visade att nästan samtliga lärare blandade läroböcker och autentiskt material i sin undervisning för att ge variation. Den främsta anledningen till detta var att lärarna upplever att elevernas motivation ökar dåundervisningen varieras och om eleverna kan se en viss verklighetsanknytning. Vissa skillnader mellan språken påvisades, då engelsklärarna i större grad uppgav att de använde autentiskt material i undervisningen. Lärare ityska och franska menade oftare att brist på material och elevernas kunskapsnivå förhindrade arbetet med autentiskt material. Lärarna påpekade även att kursplanen inte hade någon påverkan gällande materialet, utan attdet var varje lärares beslut att ta..

Utmattningsberäkning av hydraulikkopplingar : Metoder och beräkningar gällande utmattningsteorier

The purpose of this thesis is to investigate the fatigue life of two components in different hydraulic quick couplings. The crack which initiates the fatigue failure usually occurs in the bottom of one of the threads. Thus, the threads in the coupling are carefully investigated. A few different approaches for determining the fatigue life are studied for each component. CAD (Computer Aided Design) models for both components are created and analyzed with FEM (Finite Element Method).

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