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1779 Uppsatser om Mechanical engineering - structural dynamics - Sida 14 av 119


Mekaniskt snytbaggeskydd

Insecticides will be removed from Swedish forestry, at present insecticides are used to treat our seedlings to avoid them from being attacked by pine weevils. With the forthcoming ban on insecticides alternative protective measures will have to be tested. Holmen Forest Ltd has aimed to find an alternative and have developed a mechanic pine weevils protection accessory as well as a new concept on planting pipes. Studies have been conducted on the behalf of Holmen Forest Ltd to see how planting with the newly developed mechanical protectors and plant pipe stands up against the conventional methods used today. The study was conducted over a three week period. Three factors were compared regarding planting quality including i) pressure around the plant, ii) the depth the plant ended up in, iii) plant angle. Mechanical plant pipes were used in the study, and where tested like a one-handed and a two-handed pipe. The study concludes that further development is needed for the mechanic plant protector to live up to the speed and quality of conventional methods.

The Key Success Factors of Grameen Bank - A Case Study of Strategic, Cultural and Structural Aspects

The thesis aims to analyze strategic, cultural and structural aspects of Grameen Bank and its micro-credit project, in order to identify key success factors. A case study was performed with an inductive and qualitative approach, using semi-structured interviews. The data was collected by field observations and interviews on site in Dhaka, Bangladesh and surrounding areas.The main conclusion is that the critical success factor of Grameen Bank is the relationship focus, guiding and aligning its strategy, culture and structure. Also, local offices have been observed to utilize practices not permitted by the bank?s management, ultimately increasing the organizational efficiency..

90-talskrisens effekter p? syssels?ttningsstrukturen f?r Lund och Malm?

The employment structure consists of different sectors, whose share of the total employment rate is all part of an economic structural conversion according to this thesis applied theoretical approach. A structural conversion, which consist of recurring crises, such as the financial crises in the early 1990s. This crisis and its effect on the Swedish economy is well-documented, while the shortage regarding the effect on a smaller scale, in a local and regional context, provides this thesis purpose. More specifically, a comparison between the two neighbouring towns of Malm? and Lund, will constitute the local contexts in this research.

Utveckling av en Multi-Zonsmodell för NOx Bildning i Diesel Motorer

This thesis work is the last part of the Master of Science education inmechanical engineering at KTH, Stockholm.The aim of this project was the development of a Multi-zone modelfor NOxformation in Diesel engines. Because of the stringent emissionlegislations, great effort is made to decrease the fuel consumption and theharmful emissions of internal combustion engines. Computer simulationsplay a decisive role in this context because they substitute the expensiveand time-consuming laboratory tests.The model is based on a multi-zone approach and uses the wellknownExtended Zeldovich Mechanism which gives a relation to calculatethe NO formation rate using the concentration of different gas speciesinvolved in the process.All the most important phenomena involved in the Diesel combustionhave been modelled. A special attention is then paid to the equilibriumconcentration calculation; this is a significant part of the model whichstrongly influences the following steps.A Simulink model has also been developed. This second version isbased on the previous model and it is made especially to allow theconnection with other external softwares, GT-power in this case.

Användarinvolvering i ett systemutvecklingsprojekt -Är det effektivt?

In most software engineering project, users are only involved in the beginning of the project as a help to design the requirements specification but users can be involved after this phase too, but is it effective to do so? With this report we would like to investigate how effective it is to involve users after the requirements specification has been written and approved. To find out how effective it is to involve the users we try some fast and simple involvement techniques on a quite far gone project. These techniques include ethnographic studies, prototypes and surveys. We also interviewed a couple of people who work with usability and finally delivered a report with our results to them to find out if they found our result relevant. By also documenting how much time we spent involving users we will show to which degree user involvement is effective. We found out that a couple of fast techniques could get very much result in the form of usability enhancing suggestions to the developers.

ROLL UP! Produkten som förenklar hanteringenav en dragfjäder : Ett examensarbete som startade med en enkel idé och utvecklades till en prototyp

This report presents an independent thesis corresponding 15hp and was carried out on Högskolan in Halmstad during the spring of 2014. The thesis is the final course which ends a three-year mechanical engineering program with focus on technical design.The thesis started in an operation which electricians are exposed to every day. The operation in question is cable laying or wiring. The tool they use is called a tension spring and is a long and stiff wire, usually made out of nylon or fiberglass. The tension spring is fed through pipes in the walls and brings the desired cables with it on the way back.

Teknik och teknisk kompetens enligt förskolans pedagoger : En studie av pedagogernas syn på teknik

System Andersson AB is a company located in Jönköping that works with developing computer systems for the mechanical engineering industry. As of today, when this report is written, the company is working on the development of a new Manufacturing Planning and Control (MPC) system. This new system aims to create not only a user friendly interface but also a modern, stylish interface. To achieve this, the company has decided to work with a, for them, new application framework; Windows Presentation Foundation (WPF).System Andersson is well known for developing systems for different kinds of touch screens, this project is no exception. For this new user interface the company wishes to implement different types of Drag&Drop functionality.

Barkar det åt skogen för svenskt tidningspapper? : empirisk analys av efterfrågan och företagsstrategier på den svenska marknaden

According to Food and Agriculture Organization newsprint is defined as: Uncoated paper, unsized (or only slightly sized), containing at least 60 percent of mechanical wood pulp. The consumption of newsprint in Sweden was just over 798 000 tonnes in 2009, which represents approximately 90 kg per person. Although there are studies that predict a drastic reduction in newsprint consumption in the Western world, there seems to be a clear difference between forecasts for the future given by statistical analysis of newsprint consumption and forecasts given by experts in the industry. The former predict a continuing increase while the experts see a coming decrease in consumption.In this report, both demand and business strategies of newsprint in Sweden are studied. The study also presents a forecast of the future which is based on historical data and qualitative interviews.

Kodgenerering i CASE-verktyg : En undersökning hur CASE-verktyg uppfyller experters kodgenereringskrav

Denna rapport undersöker krav, tagna från ett ramverk för evaluering av CASE-verktyg i ett kontextuellt sammanhang, i två representativa CASE-verktyg. Ramverket utnyttjar en modell som föreslagits av Lundell och Lings för att extrahera både krav och förväntningar som en organisation (www.it.volvo.com) hade på vad ett CASE-verktyg är och kan utföra.Ramverket extraherar krav i ett organisationell kontext, dvs. utvärderingen utfördes innan verktyget som evaluerades användes i organisationen. Detta indikerar på att kraven inte är knutna till ett specifikt verktyg, samt att CASE-verktyg inte säkert stödjer dessa krav.Resultatet för denna rapport är att viss semantisk förlust uppstod vid transformering av kod och modeller..

Lövsuccessioner i sluttningar längs nedre Umeälven :

Secondary deciduous forests, which have their origin in earlier pasture- and meadow-land in slopes along the lower reaches of the Ume river, are thought to contain high nature conservation values, in spite of a relatively low age. The aim of this study was to clarify how factors as historical use, exposition, disturbance dynamics and successional age influences the conservation values in these types of riparian forests and how this can be implicated in the practical work with conservation and management at Umeå municipality. Sample plots were placed in seven stands with a variation of their historical use, exposition, disturbance dynamics and age of succession. Conservation values as structure, tree-regeneration, abundance and composition of vascular plants, amount of dead wood and the abundance of signal-species were measured and registered. The species composition and especially the composition of tree species, differed between forests with different exposition and different historical use.

Integrationens paradoxer : En intervjustudie av integrationen i praktiken

The purpose of this study is to examine the relations of power within the discourse of integration and my focus will be on power relations and structural discrimination. The study origins from four qualitative interviews with employees from the County administrative board as well as from the Employment office.The theoretical framework is based upon Social Constructionism, Postcolonial Theories and with an intersectional perspective. The recent critical research from The Official Report on power, integration and structural discrimination (Utredningen om makt, integration och strukturell diskriminering) is used as well as Foucault's theory of biopower which is discussed within the analysis.The study indicates that although integration often is addressed as a reciprocal process, it is still assumed that They should be integrated by Us. The present government's one-sided focus on employment has proved difficult for the employees to put into practise and when the responsibility of obtaining employment is based upon the individual alone, she/he becomes responsible for her/his own integration..

Kan det vara hypertext? Ett försök att analysera en månglineär, flersekventiell pappersburen text som hypertext

The object of this thesis is to discuss the limits of the hypertext concept. The issue is whether the concept of hypertext necessarily depends on the conditions of the electronic media and www, or if the concept of hypertext more likely is founded on certain textual structures and strategies. In the light of contributions to hypertext theory during the 1990s, this thesis compares different views on hypertext, and concludes with an evaluation. The poem it the authors own translation of the original Danish title det, written in 1969 by the system-poet Inger Christensen, is the object of this case study. The poem is analysed with respect to its structural organisation and literary composition.

Rening av avloppsvatten efter skärprocess

ABB I-R Waterjet Systems combines the robotics and motion expertise of ABB Flexible Automation with high-pressure intensifier/pumping technology from Ingersoll-Rand to provide and continue to develop innovative waterjet cutting systems for global markets. The purpose of this assignment is to develop a process water purifier. The purifier should be applicable as an option to ABB I-R?s production cell Cutting-Box. At first hand the process water should be purified well enough to let out in the municipal sewage system, but the ultimate solution is purifying the process water to the range that recycling is possible. When investigating the different principle of purifying water, a research of different products and their manufactories was done. These different products were compared and the principle of filtration was the most applicable, as most of the products were designed for far larger applications. As the process water contains quite large amount of particles, it is necessary to perform the filtration in different steps. The process water purifier is therefore composed of a module of coarse filtration and one of micro filtration. In the module of coarse filtration the mainly amount of fibres and particles are eliminated. They are kept back in the container unit with the larger fragments and dumped with these when the container is emptied. In the module of micro filtration the filtration is performed in two steps. In the first step particles larger than 50?m are eliminated, in the second step the micro filter is setting the range of purifying, in this case 10?m.

Prototyputprovning av upphängningssystem

Examensarbetet gick ut på att stötprova ett system för upphängning av kablar och rör i fartyg. Vid stötprovningen monterades upphängningssystemet i en fixtur. Gruppen fick fria händer att utforma fixturen. Med hjälp av Fredy Olssons teorier om produktframtagning utvecklades en fixtur bestående av fyrkantrör. Genom att värdera och selektera bland de lösningar som presenterades i examensarbetet ?Upphängningssystem? BTH-IMA-EX?2000/C-02-SE och andra nytillkomna likvärdiga lösningar, har gruppen kommit fram till och stötprovat ett system, bestående av aluminiumprofiler och vinklar från Bosch Rexroth.

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