• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 16
  • 4
  • 2
  • Tagged with
  • 26
  • 11
  • 4
  • 4
  • 3
  • 3
  • 3
  • 3
  • 3
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
21

End of line test : En studie av företaget Emotrons linjetestning i produktionen

Svendsen, Toni January 2008 (has links)
Emotron is a company specialised in developing, producing and marketing equipment to con-trol, monitor and protect processes and machinery driven by electric motors, with an applica-tion focus. Examples of uses for their products are fans, pumps, lifts and cranes. The project is to look at Emotrons end of line test. The company has seen that at the final test-ing there is a bottleneck that restricts the outflow and prevents an increase in the number of tested products. The purpose of this project is to review how Emotrons end-of-line test works today and if there is a possibility to make the test more efficient in such a way that the quality is not at risk, while increasing the outflow of tested products. The projects first step is to look at and analyse what is causing the bottleneck at the end-of-line. When the analysis is complete, the next step is to review whether there is a possibility to solve the bottleneck and if so in what way can this be done. Emotrons most overall objective of the project is to increase the outflow of the number of tested products without jeopardizing the quality. An analysis has been made on frequency inverters, soft starters and shaft power monitors. Fail reports for the year 2007 have been reviewed. Faults that have been detected have been sub-mitted by type and size. The testing has been divided into various phases of error. A time pre-cision has been established to show the time of the test stages. The distinction has been made to provide a picture of where and when errors occur during the testing. A logging test has been carried out on the largest frequency inverter types to determine the characteristics of frequency inverters when tested with load by today's test method. It has also carried out a logging test with an artificial load. An analysis is made on a test machine that is under construction, which today is called PEBB test. The conclusions to be drawn from the analyses and tests carried out, in order to meet the company's objectives, and answer the project's problem is that it is possible to make the end of line test more efficient. The end of line test can be more efficient by combining the strength of the PEBB test, which is its measurement equipment, with the artificial load method where the frequency inverter is tested as it is expected to serve at the final customer. This can in-crease the outflow of tested products and maintain Emotrons requirements for quality.
22

Inclusion d'algèbres de Hecke et nombres de décomposition

Rassemusse Genet, Gwenaelle 16 June 2004 (has links) (PDF)
Cette thèse comporte trois parties. Dans la première, nous nous intéressons à la formule du commutateur d'un groupe admettant une BN-paire scindée. Nous montrons que sous une condition dite "condition de Lévi faible", le groupe vérifie cette formule. Dans la seconde partie, nous étudions la conservation de la forme unitriangulaire lors du passage d'une matrice de décomposition d'un module sur une algèbre graduée à la matrice de décomposition de la restriction de ce module sur l'algèbre effectuant la graduation et vice-versa. Nous verrons des applications pour des algèbres cellulaires pourvues également d'autres propriétés, notamment des algèbres de Ariki-Koike. Nous terminons par une partie traitant de la conjecture de J. Gruber et G. Hiss pour les nombres de décomposition des algèbres de Hecke de type B et D. Nous généralisons et prouvons cette conjecture dans le cas des algèbres de groupes de réflexions complexes. Puis nous observons quels sont les problèmes de la généralisation des méthodes utilisées lors du passage des algèbres de groupes aux algèbres de Hecke (de type B et D). Enfin, nous donnons une condition naturelle sur des filtrations de modules de Specht, sous-laquelle la conjecture est satisfaite.
23

Vertikaltransportör : Till pappersrullar / Vertical transporter : for paper rolls

Ferreira Neto, Luiz Benicio January 2013 (has links)
This project includes a thesis performed at Karlstad University in spring 2013. The thesis is included in the mechanical engineering program and contains 22.5 university points, which is equivalent to 480 hours of work including self-study.   This work has implemented by the student Luiz Ferreira in cooperation with the firm Camatec Industriteknik AB in Karlstad.   The purpose of this project has been that the company Camatec wants to offer their customers a standard vertical transporter. This transporter must be able to transport paper rolls, which can weigh up to 5 tons, between two floors. The objective with this project has been to prepare a complete set of drawings for a vertical transporter and a price estimate of all its components. This transporter must fit into a given elevator shaft but also be able to adapt into different dimensions.   A vertical transporter has been developed with help of different methods including 3D-modeling, Finite Element Method and strength calculations.   The total development of the transporter has been divided into several areas of constructions: Receiver for paper rolls An existing receiver for paper rolls has been redesigned and adapted into the new construction. Frame A frame has been developed including I-beams, flat bars and hollow structural sections which have been connected with welding and bolts to hold the receiver. Mechanism A mechanism of shaft and bearings, which allow the receiver to rotate so the paper rolls can relief in a facility way, has been designed. Guiding A guiding section has been developed, in which t-grids have been used to guide the transporter along the given elevator shaft. Vibration damper Two ANB 100 vibration dampers with a hardness of 70 Shore have been used to suppress one side of the receiver so it can rotate. Hoist An appropriate rope hoist for this transporter has been discussed with the firm ABUS Kransystem AB in Karlstad. This hoist carries almost the entire transporter.   Standard components are used through the entire project and these have been estimated at an amount of about 306 000 Swedish crowns, where prices for the existing solution of receiver, processing and installation are not included.
24

Lightweight elevator : A portable elevator capable of climbing rooftops / Lättviktshiss

Malmström, Tore, Göransson, Carl January 2021 (has links)
The purpose of this project is to design and construct a portable lightweight elevator for transportation of goods to rooftops. The elevator should be easy to transport, assemble and disassemble, it should also be useful at various heights and for a wide range of roof inclinations. The elevator contains a railway consisting of four separable modules. A carriage rides the railway and is pulled to the top with a winch powered by a DC-motor. The carriage starts and stops using a Rocker switch and a Hall sensor that detects magnets placed at the end and beginning of the railway. After performing tests with the elevator the conclusion is that the elevator is practical to assemble and transport, but the carriage derails too easily when the railway has angular changes. / Målet med projektet är att designa och konstruera en portabellättviktshiss som kan transportera gods från marknivå till hustak. Den ska vara lätt att transportera och att montera ner och upp, den ska också gå att anvåanda för olika höjder och på hus med olika taklutningar. Hissen består av en räls som går att ta isär i fyra olika delar. En vagn åker på fyra hjul uppför rälsen och lyftkraften kommerfrån en vinsch som drivs av en likströmsmotor. Vagnen kan starta och stanna med hjälp av en knapp, den stannar även automatisk då en hallsensor på vagnen känner av magneter som är placerade vid början och slutet av rälsen. En arduino Uno skickar signaler mellan de elektriska komponenterna och motorn får ström via en H-brygga, vilket gör att den kan rotera i båda riktningarna. Efter att hissen testats kan det konstateras att konstruktionen är enkel att bygga ihop och smidig att fästa vid olikavinklar och höjder. Däremot spårar vagnen ofta ur då hissen körs med för branta vinklar mellan de olika delarna av rälsen.
25

Soviet spies and the fear of communism in America : reactions of Congress to the Alger Hiss Case, 1948-1960

Rainville, Brigitte 19 April 2018 (has links)
Le but de ce mémoire est de mettre en évidence la réaction des membres du Congrès des États-Unis dans le cadre de l'affaire Alger Hiss de 1948 à 1960. Selon notre source principale, le Congressional Record, nous avons pu faire ressortir les divergences d'opinions qui existaient entre les partisans des partis démocrate et républicain. En ce qui concerne les démocrates du Nord, nous avons établi leur tendance à nier le fait de l'infiltration soviétique dans le département d'État américain. De leur côté, les républicains ont profité du cas de Hiss pour démontrer l'incompétence du président Truman dans la gestion des affaires d'État. Il est intéressant de noter que, à la suite de l'avènement du républicain Dwight D. Eisenhower à la présidence en 1953, un changement marqué d'opinions quant à l'affaire Hiss s'opère ainsi que l'attitude des deux partis envers le communisme. Les démocrates, en fait, se mettent à accuser l'administration en place d'inaptitude dans l'éradication des espions et des communistes. En ayant recours à une stratégie similaire à celle utilisée par les républicains à l'époque Truman, ceux-ci n'entachent toutefois guère la réputation d'Eisenhower. Nous terminons en montrant que le nom d'Alger Hiss, vers la fin de la présidence Eisenhower, s'avère le symbole de la corruption soviétique et de l'espionnage durant cette période marquante de la Guerre Froide. / This masters thesis examines the reactions of members of the House of Representatives and the Senate to the Alger Hiss case starting in 1948 until the end of 1960. Through analysis of the Congressional Record, a striking contrast in political opinions emerged. While Northern Democrats denied the possibility of Soviet infiltration during the HUAC hearings, Republican’s used the Hiss scandal to demoralize the Truman administration. The election of Dwight D. Eisenhower to the presidency in 1952 changed the way both parties reacted to the communist issue and the repercussions of the Hiss case. Whereas Democrats had previously contradicted accusations of Soviet espionage in the State Department, they began criticizing the Republican administration of being soft on communism in an attempt to recreate the same atmosphere of distrust that had plagued Truman’s time in office. By the end of Eisenhower’s presidency in 1961, Alger Hiss’ name came to represent Soviet espionage of the Cold War era.
26

TILLGÄNGLIGHET I KULTURHISTORISKA BYGGNADER : En fallstudie om Hospitalsgatan, Långgatan och Kyrkogatan med fokus på kulturvärdet, säkerhetsrisker och tekniska åtgärder för ramp, hiss och dörr i Strängnäs kommun

Al-Dabbagh, Lara, Noel, Miriam, Matti, Fadi January 2023 (has links)
Purpose: This study aims to assess the three cultural historical buildings located in the municipality of Strängnäs, that doesn’t meet the accessibility requirements currently.  Therefore, the aim is to suggest solutions for each three buildings that could be useful to different authorities in the future. The focus is on wheelchair users using the buildings with the help of technical installations such as ramp, elevators, and accessible doors. The study will be based on the social-, historical-, and aesthetic aspect as well as the safety risk. Method: The method for this study is based on a literature study, and a case study, alongside with reference objects which will be the inspiration for our results. The literature study is based on fact-gathering from books and the internet which provides the study with information on cultural historical buildings, laws and regulations concerning the private buildings, cultural values, and with various safety risks. While the reference objects inspired our proposals for the measures, the case study was used to gather information in form of an interview, site visits, and communal document analysis. Results: The result of thisstudy provides measures for each of the three studied objects. Changes made to the first building, Hospitalsgatan 15, focuses on the side entrance with a ground slope pointing down towards it. Thereby the following indoor changes presents threshold ramp, and a stairlift. For the secondary building, Långgatan 9 E-F, there was suggestions made such as using an outer ramp with an idle plan. There should also be an indoor loose ramp, and a stairlift. The third building, Kyrkogatan 13, had suggestions by installing an outdoor platform lift with an adjusted idle plan in front of the outer stairs and threshold ramp. In comparison to the first mentioned building, the focus for the last two buildings were on the main entrance. All these measures were considered to reach an accessibility in cultural historical building while also keeping in mind the cultural value of the building and its safety risks. Conclusions: The study concludes that the social-, historical-, and aesthetic aspect as well as the safety risk works a crucial role in shaping the proposed solutions for the three buildings and contributes to the accessibility improvements. By adopting appropriate technical installations and considering the cultural significance of these structures, accessibility in cultural historical buildings can be achieved effectively.

Page generated in 0.0442 seconds