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  • 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.
1

Some theoretical and experimental aspects of design with brittle material /

Robinson, Ernest Y. January 1965 (has links)
Thesis (M.S.)--Oregon State University, 1965. / Typescript. Includes bibliographical references (leaves 77-80). Also available on the World Wide Web.
2

Engineering tools for robust creep modeling /

Holmström, Stefan. January 1900 (has links) (PDF)
Thesis (doctoral)--Aalto University, 2010. / Includes bibliographical references. Also available on the World Wide Web.
3

The economics of engineering testing

Rackett, Gerald Franklin. January 1927 (has links) (PDF)
Thesis (Professional Degree)--University of Missouri, School of Mines and Metallurgy, 1927. / The entire thesis text is included in file. Typescript. Title from title screen of thesis/dissertation PDF file (viewed October 5, 2009) Includes bibliographical references (p. 97-99) and index (p. 100-102).
4

Time-dependent compressive strength of unidirectional viscoelastic composite materials /

Violette, Melanie Glenn, January 2000 (has links)
Thesis (Ph. D.)--University of Texas at Austin, 2000. / Vita. Includes bibliographical references (leaves 277-283). Available also in a digital version from Dissertation Abstracts.
5

Impacts of kinematic links with a granular material

Lee, Seunghun, Marghitu, Dan B. January 2009 (has links)
Dissertation (Ph.D.)--Auburn University, 2009. / Abstract. Vita. Includes bibliographic references (p.147-151).
6

Bio-based composite sandwich panel for residential construction

Hu, Bo. January 2006 (has links)
Thesis (Ph.D.)--University of Delaware, 2006. / Principal faculty advisor: Harry W. Shenton, Dept. of Civil & Environmental Engineering. Includes bibliographical references.
7

Optical measurement of strand geometry and orientation and their influence on oriented strand composite formation quality /

Gaete-Martinez, Victor, January 2009 (has links)
Thesis (M.S.) in Forest Resources--University of Maine, 2009. / Includes vita. Includes bibliographical references (leaves 143-148).
8

Efeito da clorexidina na reidratação da dentina irradiada com laser Er:YAG após envelhecimento / Chlorhexidine effect on rehydration of irradiated dentin with Er:YAG laser after aging

Galafassi, Daniel 03 February 2012 (has links)
Esse estudo in vitro avaliou a resistência adesiva da dentina preparada com laser de Er:YAG ou broca, reidratada com clorexidina ou água deionizada, após armazenamento em saliva artificial e termociclagem. Cento e vinte terceiros molares humanos hígidos foram seccionados no terço médio da coroa, expondo a superfície dentinária (n=10). Os espécimes foram divididos aleatóriamente de acordo com o tratamento [laser de Er:YAG + reidratação com água deionizada (LW), laser de Er:YAG + reidratação com clorexidina a 2% (LC), turbina de alta-rotação com broca #245 + reidratação com água deionizada (TW) e turbina de alta-rotação com broca #245 + reidratação com clorexidina a 2% (TC)]. Após o preparo da dentina, os espécimes foram condicionados com ácido fosfórico 35%, lavados e secos com ar. A reidratação da dentina foi realizada através da aplicação de 1.5!L de água deionizada ou clorexidina 2%. Um sistema adesivo etch and rinse foi aplicado seguido da restauração com resina composta. Em cada grupo os espécimes foram sub-divididos de acordo com o envelhecimento [24 horas de armazenamento em saliva artificial / sem termociclagem (NA); 6 meses de armazenamento em saliva artificial / 12.000 ciclos térmicos (6A); 12 meses de armazenamento em saliva artificial / 24.000 ciclos térmicos(12A)]. Após cada período de envelhecimento, os dentes foram seccionados a fim de se obter 4 palitos com area de ±1.0 mm2, que foram submetidos ao teste de microtração usando uma máquina universal de testes com velocidade de 0.5 mm/min. Para a análise da interface adesiva em MEV foram utilizados 36 terceiros molares hígidos (n = 3) que foram restaurados e envelhecidos como descrito no protocolo empregado para o teste adesivo. ANOVA a dois critérios mostrou que não houve diferença significante para a interação entre os fatores e para o fator envelhecimento. O teste de Tukey 5% mostrou que o grupo LC apresentou os menores valores de resistência adesiva. A análise da interface adesiva através da MEV demonstrou que para os grupos irradiados houve formação de camada híbrida irregular com presença de fendas e o envelhecimento não interferiu na morfologia da interface adesiva. A reidratação com clorexidina influenciou negativamente a resistência adesiva do prepare com laser de Er:YAG. O envelhecimento em saliva artificial e termociclagem não interferiram na resistência adesiva da dentina. / This in vitro study evaluated the bond strength of dentin prepared with Er: YAG laser or turbine, rehydrated with chlorhexidine or deionized water after artificial saliva storage and thermocycling. One hundred twenty human third molars were sectioned in order to expose the dentin surface (n=10). The specimens were equally and randomly divided according to treatment [Er:YAG laser + deionized water rehydration (LW), Er:YAG laser + chlorhexidine 2% rehydration (LC), bur on high-speed turbine + deionized water rehydration (BW) and bur on high-speed turbine + chlorhexidine 2% rehydration (BC)]. After dentin preparation, the specimens were etched with 35% phosphoric acid, washed and dried with air. The dentin rehydration method was performed with deionized water or chlorhexidine 2% by applying 1.5!L of each solution. An etch and rinse adhesive system was then applied and the samples were restored with a composite. In each group, the specimens were sub-divided in accordance with the aging method [24 hours artificial saliva storage, no thermocycling (NA); 6 months of artificial saliva storage, 12.000 thermocycling (6A); 12 months of artificial saliva storage, 24.000 thermocycling (12 A)]. After each aging period, each tooth was sectioned in order to obtain 4 sticks with a cross-sectional area of 1.0 mm2, which were submitted to microtensile test using the Universal Test Machine (0.5 mm/min). For the adhesive interface analysis by SEM, 36 healthy third molars (n=3) were restored and aged as the protocol used for the adhesive test. The two-way ANOVA showed no significant differences for the interaction between the factors and for the aging factor. Tukey test 5% showed that the LC group had the lowest bond strength values. The adhesive interface analysis by SEM showed that the irradiated groups presented irregular hybrid layer and cracks and the aging did not affect the adhesive interface morphology. The rehydration with chlorhexidine negatively influenced the bond strength of the preparation with the Er:YAG laser. The artificial saliva aging and thermocycling did not interfere with dentin bond strength.
9

Análise in vitro da resistência fluxural de uma resina composta direta e uma resina laboratorial de segunda geração associadas ou não a fibras de reforço

Portero, Priscila Paiva 22 February 2006 (has links)
Made available in DSpace on 2017-07-24T19:22:15Z (GMT). No. of bitstreams: 1 Priscila Paiva.pdf: 771030 bytes, checksum: 5f6283269831858bcc9efe855624762e (MD5) Previous issue date: 2006-02-22 / The present study aims to evaluate in vitro the flexural strength of the direct composite resin (FiltekTM Z-250 – 3M/ESPE) and of the second generation laboratory resin (CeseaDST II – Kuraray) either associated or not to glass fibers (Fibrex-coronal – Angelus), varying the source of photoactivating (L.E.Demetron 1 – Kerr e Strobolux – EDG). Fifty-six samples were made inside a biparted metalic matrix, 13.0 mm in diameter X 2.4 mm thick, divided into 8 study groups (n=7): GI – Resin FiltekTM Z-250/ Fibreless/ LED; GII – Resin FiltekTM Z-250/ Fibreless/ Strobolux; GIII - Resin FiltekTM Z-250/ Fibrex-coronal/ LED; GIV - Resin FiltekTM Z-250/ Fibrex-coronal/ Strobolux; GV – Resin CeseaDST II/ Fibreless / LED; GVI - Resin CeseaDST II/ Fibreless / Strobolux; GVII - Resin CeseaDST II/ Fibrexcoronal/ LED; GVIII - Resin CeseaDST II/ Fibrex-coronal/ Strobolux. The samples were under the test of biaxial flexural strength in the Kratos equipment, with speed of 1 ± 0.5 mm/min and load cell of 500 Kgf. The flexural strength values were submitted to the Tukey test (P=0,01). The rate of the results in MPa were: GI – 187.91 ± 32.78; GII – 196.76 ± 31.15; GIII – 208.27 ± 18.79; GIV – 218.02 ± 15.76; GV – 101.72 ± 11.25; GVI – 103.05 ± 9.56; GVII – 164.76 ± 12.54 e GVIII – 176.75 ± 47.03. The conclusion is that the analyzed composites showed different behaviors in vitro; the direct composite FiltekTM Z-250 showed higher values of flexural strength in all the studied groups; the type of light source did not interfere in the flexural strength of the evaluated composites; reinforcement with fibers increased the flexural strength both evaluated composites, however only for the indirect composite CeseaDST II that increase was significant. / O objetivo deste estudo foi avaliar in vitro a resistência flexural da resina composta direta (FiltekTM Z-250 – 3M/ESPE) e da resina laboratorial de segunda geração (CeseaDST II – Kuraray) associadas ou não a fibras de vidro (Fibrexcoronal – Angelus), variando a fonte de luz fotoativadora (L.E.Demetron 1 – Kerr e Strobolux – EDG). Foram confeccionados 56 corpos-de-prova (CP) em uma matriz metálica bipartida com as dimensões de 13,0 mm de diâmetro X 2,4 mm de espessura divididos em 8 grupos (n=7) de estudo: GI - Resina FiltekTM Z-250/ Sem fibras/ LED; GII – Resina FiltekTM Z-250/ Sem fibras/ Strobolux; GIII - Resina FiltekTM Z-250/ Fibrex-coronal/ LED; GIV - Resina FiltekTM Z-250/ Fibrex-coronal/ Strobolux; GV – Resina CeseaDST II/ Sem fibras/ LED; GVI - Resina CeseaDST II/ Sem fibras/ Strobolux; GVII - Resina CeseaDST II/ Fibrex-coronal/ LED; GVIII - Resina CeseaDST II/ Fibrex-coronal/ Strobolux. Os CP foram submetidos ao teste de resistência flexural biaxial no equipamento Kratos com velocidade de 1 ± 0,5 mm/min e célula de carga de 500 Kgf. Os valores de resistência flexural foram submetidos ao teste de Tukey (P=0,01). A média dos resultados em MPa foram: GI – 187,91 ± 32,78; GII – 196,76 ± 31,15; GIII – 208,27 ± 18,79; GIV – 218,02 ± 15,76; GV – 101,72 ± 11,25; GVI – 103,05 ± 9,56; GVII – 164,76 ± 12,54 e GVIII – 176,75 ± 47,03. Concluiu-se que: os compósitos avaliados apresentaram diferentes comportamentos in vitro; o compósito direto FiltekTM Z-250 apresentou maiores valores de resistência flexural em todos os grupos estudados; o tipo de fonte de luz não interferiu na resistência flexural dos compósitos avaliados; o reforço com fibras aumentou a resistência flexural de ambos os compósitos avaliados, sendo que apenas para o compósito indireto CeseaDST II esse aumento foi significante.
10

The feasibility of diamond-alumina as a wear resistant material

Duvenage, Sarel. January 2007 (has links)
Thesis (M.Eng.(Metallurgical Engineering))--University of Pretoria, 1999. / Summaries in Afrikaans and English. Includes bibliographical references.

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