Thesis (M.S.)--West Virginia University, 2001. / Title from document title page. Document formatted into pages; contains vii, 73 p. : ill. Vita. Includes abstract. Includes bibliographical references (p. 64-69).

This report describes a Bachelor Degree project in product development completed in co-operation with the Royal Parks in London and submitted to the University of Skövde. The aim of the project was to design and develop a removable bollard intended to separate traffic in a bi-direction cycle lane in central London. The goal was to develop a lightweight yet robust removable bollard that complimented the historical surroundings and had a simple storage solution. With thorough background research, established ideation methods and strategic evaluation a suitable solution was found. The final design was an innovative bollard made out of recycled plastic and specially adapted for simple removal and storage. It is a bollard that would successfully mark the cycle lane and is both lightweight and stackable. / Denna rapport beskriver ett examensarbete i produktutveckling som utfört var i samarbete med the Royal Parks i London och inlämnat till Högskolan i Skövde. Syftet med projektet var att utforma och utveckla en borttagbar pollare tilltänkt för att separera trafik i en dubbelriktad cykelbana i centrala London. Målet var att utveckla en lätt men samt robust borttagbar pollare som passar in i Londons historiska miljö och har en enkel lagringslösning. Genom en detaljerad förstudie, kända idégenereringsmetoder och strategisk utvärdering hittades en lämplig lösning. Den slutliga designen var en innovativ pollar gjord av återvunnen plast och speciellt anpassad för enkel flyttning och förvaring. Pollaren är både lätt och stapelbar samt kan användas för att markera cykelbanor.

Thesis (M.S.)--University of Michigan, 1971.

Thesis (M.S.)--University of Michigan, 1969.

Thesis (M.S.)--University of Michigan, 1987.

Thesis (M.S.)--University of Michigan, 2006. / Includes bibliographical references (leaves 119-131).

Thesis (M.S.)--University of Michigan, 1987.

Thesis (M.S.)--University of Michigan, 1969.

Thesis (M.S.)--University of Michigan, 1971.

Made available in DSpace on 2014-06-11T19:28:56Z (GMT). No. of bitstreams: 0 Previous issue date: 2003-02-17Bitstream added on 2014-06-13T18:58:07Z : No. of bitstreams: 1 lopes_jfs_me_arafo.pdf: 1497511 bytes, checksum: 5cff0da20eacc454b65a7066c2aba9f6 (MD5) / O objetivo desta investigação foi determinar a resistência de união e limite de fadiga de nichos confeccionados em resina composta e ionômeros de vidro. Setenta e cinco corpos-de-prova (incisivos mandibulares humanos hígidos) com etiquetas adesivas com perfurações de 3,5mm de diâmetro foram adaptadas sobre a superfície lingual de cada dente. Esta delimitação tinha como objetivo padronizar a área da superfície de esmalte a ser condicionada e, posteriormente, mantida em contato com os materiais restauradores. Para realização dos nichos, matrizes foram realizadas para cada corpo-de-prova onde o material restaurador foi inserido. Os corpos-de-prova foram imersos em água destilada a 37ºC por um período de 30 dias. Para os ensaios de resistência à união, a máquina de testes mecânicos MTS modelo 810 foi calibrada utilizando uma velocidade de deslocamento de 0,5mm/min. Para os testes de limite de fadiga a máquina de testes foi calibrada para submeter cada corpo-de-prova a 10.000 ciclos constantes, com uma freqüência de 5 Hz, amplitude inicial de 0,5 mm e velocidade de rampa inicial de 100N/s. Os valores originais do experimento foram convertidos de N para MPa em função da área da base do nicho (circular) previamente calculada. Os corpos-de-prova após a fratura foram avaliados através de microscopia eletrônica de varredura com aumento de 500 vezes. A médias de resistência à união e limite de fadiga foram comparadas estatisticamente usando o teste de Análise de Variância a um Critério. Nos teste de cisalhamento, a resina composta Z-100 produziu maior valor de resistência de união (12,25 MPa) ao esmalte dentário que o ionômero de vidro convencional Fuji IX (7,21MPa). Não foram observadas diferenças entre os valores do material Fuji II LC (10,29MPa) e os demais materiais. Para todos os materiais, os corpos-de-prova testados por meio de ensaio dinâmico de... / The aim of this study was to determine the bond strength and fatigue limit of rest seats prepared with composite resin and glass ionomer cements. The lingual aspect of seventy-five specimens (intact human mandibular incisors) was delimited by adhesive tags with 3.5-mm diameter perforations. This delimitation aimed at standardizing the area of enamel surface to be etched and later kept in contact with the restorative materials. For preparation of the rest seats, matrixes were obtained for each specimen on which the restorative material was placed. The specimens were immersed in distilled water at 37ºC for a period of 30 days. For the bond strength assays, the mechanical assay machine MTS model 810 was calibrated at a displacement speed of 0.5mm/min. For the fatigue limit tests, the assay machine was calibrated so as to submit each specimen to 10,000 constant cycles, at a 5-Hz frequency with an initial range of 0.5mm and initial sloping speed of 100N/s. The original values of the experiment were converted from N to MPa according to the previously calculated circular area of the base of the rest seat. After fracture, the specimens were evaluated by means of scanning electron microscopy with magnification of 500x. The means of bond strength and fatigue limits were statistically compared through the one-way variance analysis. For the shear resistance test, the composite resin Z-100 yielded a higher value of bond strength (12.25 MPa) to the dental enamel than the conventional glass ionomer cement Fuji IX (7.21MPa). No differences could be found between Fuji II LC (10.29MPa) and the further materials. For all materials, the specimens submitted to dynamic fatigue assay tests yielded lower mean values than those achieved through static shear assays. Regarding the fatigue limit values, all materials presented different behaviors, being that Fuji II LC obtained the higher mean value (6.4MPa), ...(Complete abstract, click electronic access below)