Thesis (Ph. D.) -- Lincoln University, 2008. / Also available via the World Wide Web.

Made available in DSpace on 2014-06-11T19:27:11Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-06-02Bitstream added on 2014-06-13T19:34:57Z : No. of bitstreams: 1 santiago_lff_me_guara_prot.pdf: 4253626 bytes, checksum: 2350418ac83b8b3472defb96b99e6028 (MD5) / Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) / No presente trabalho é válido o processo de lixamento da matéria de Pinus elliottii. O objetivo principal do estudo foi entender a influência e interação dos fatores de entrada (granulometria de lixa, velocidade de corte e pressão) sobre as variáveis de saída (taxa de remoção de material, temperatura, rugosidade, potência consumida, força de lixamento, emissão acústica e integridade superficial no processo de lixamento plano da madeira Pinus elliottii, processado paralelo às fibras. O lixamento foi realizado em uma lixadeira plana com sistema de monitoramento e aquisição de dados. Utilizou-se um delineamento de blocos completamente aleatorizados para a realização do experimento. Foram ulitizados quatro tipos de granulometrais de lixa, três velocidades de corte e três pressões, com seis repetições para cada combinação totalizando 216 tratamentos. Os resultados foram analizados através de uma análise de variância (ANOVA) com nével de significância de 5%. para taxa de remoção de material foi observado que a granulometria de lixa, pressão e velocidade influenciaram significativamente. Com relação à temperatura, somente a granulometria de lixa teve uma influência significativa no aquecimento do sistema. Para o acabamento superficial, apenas a granulometria de lixa influenciou significativamente na rugosidade. O consumo de potência foi influenciado pela velocidade de corte e pressão. Para a força de lixamento, a granulometria de lixa e a pressão influenciaram significativamente. Na emissão acústica somente a granulometri de lixa influenciou significativamente no sinal captado. Para a análise de imagens foram observados diferenças no acabamento conforme se aumenta a granulometria da liza. Não foi observada nenhuma interação significativa entre os fatores velocidade de corte e pressão para todas as variáveis de saída estudadas / This study refers to about sanding process of Pinus elliottii wood following the direction of grain. The first aim of this work is trying to undersand the influence of the following factors: belt speed, pressure and grit size on the output parameters of material remove rate, temperature, roughness, image, analysis, cutting force, power consumption and acoustic emisson. It was used a sanding belt with a data acquisition system to record the output variables. For the experiment it was used a randomized block design. The level of factors consider in the experiment it were four size of grit, three levels of pressure and three levels of belt speed. The experiment total treatments of belt speed, pressure and grit size (3 x 3 x 4=36 ) was run with six replicates for a total 216 expeiments. The results of output parameters were analyzed through the analysis of variance (ANOVA) with level of significance 5%. All the factors were significant to material remove rate. Only grit sizes were significant to the differnt levels temperature. The same behavior it was observed to the roughness where only grits size were significant. Differently the power consumption was not significant to the grits size but it was significant to the levels of pressure and belt speed. It was observed that grits sizes and pressure caused significant influence on cutting force. Only grits size significant to the acoustic emission. It was observe on analysis of image that the coarse grit produces a rougher surface than the smooth grit and anatomical elements showed up more when smooth grit was used. It could not found any interaction between the factors to all outputs parameters

Thesis (Ph. D.)--University of Canterbury, 2007. / Typescript (photocopy). "October 2007." Includes bibliographical references (p. 171-179). Also available via the World Wide Web.

Thesis (Ph. D.)--University of Canterbury, 2007. / Typescript (photocopy). Includes bibliographical references. Also available via the World Wide Web.

Orientador: Manoel Cleber de Sampaio Alves / Coorientador: Marcos Tadeu Tiburcio Gonçalves / Banca: Marcos Valério Ribeiro / Banca: Eduardo Carlos Bianchi / Resumo: No presente trabalho é válido o processo de lixamento da matéria de Pinus elliottii. O objetivo principal do estudo foi entender a influência e interação dos fatores de entrada (granulometria de lixa, velocidade de corte e pressão) sobre as variáveis de saída (taxa de remoção de material, temperatura, rugosidade, potência consumida, força de lixamento, emissão acústica e integridade superficial no processo de lixamento plano da madeira Pinus elliottii, processado paralelo às fibras. O lixamento foi realizado em uma lixadeira plana com sistema de monitoramento e aquisição de dados. Utilizou-se um delineamento de blocos completamente aleatorizados para a realização do experimento. Foram ulitizados quatro tipos de granulometrais de lixa, três velocidades de corte e três pressões, com seis repetições para cada combinação totalizando 216 tratamentos. Os resultados foram analizados através de uma análise de variância (ANOVA) com nével de significância de 5%. para taxa de remoção de material foi observado que a granulometria de lixa, pressão e velocidade influenciaram significativamente. Com relação à temperatura, somente a granulometria de lixa teve uma influência significativa no aquecimento do sistema. Para o acabamento superficial, apenas a granulometria de lixa influenciou significativamente na rugosidade. O consumo de potência foi influenciado pela velocidade de corte e pressão. Para a força de lixamento, a granulometria de lixa e a pressão influenciaram significativamente. Na emissão acústica somente a granulometri de lixa influenciou significativamente no sinal captado. Para a análise de imagens foram observados diferenças no acabamento conforme se aumenta a granulometria da liza. Não foi observada nenhuma interação significativa entre os fatores velocidade de corte e pressão para todas as variáveis de saída estudadas / Abstract: This study refers to about sanding process of Pinus elliottii wood following the direction of grain. The first aim of this work is trying to undersand the influence of the following factors: belt speed, pressure and grit size on the output parameters of material remove rate, temperature, roughness, image, analysis, cutting force, power consumption and acoustic emisson. It was used a sanding belt with a data acquisition system to record the output variables. For the experiment it was used a randomized block design. The level of factors consider in the experiment it were four size of grit, three levels of pressure and three levels of belt speed. The experiment total treatments of belt speed, pressure and grit size (3 x 3 x 4=36 ) was run with six replicates for a total 216 expeiments. The results of output parameters were analyzed through the analysis of variance (ANOVA) with level of significance 5%. All the factors were significant to material remove rate. Only grit sizes were significant to the differnt levels temperature. The same behavior it was observed to the roughness where only grits size were significant. Differently the power consumption was not significant to the grits size but it was significant to the levels of pressure and belt speed. It was observed that grits sizes and pressure caused significant influence on cutting force. Only grits size significant to the acoustic emission. It was observe on analysis of image that the coarse grit produces a rougher surface than the smooth grit and anatomical elements showed up more when smooth grit was used. It could not found any interaction between the factors to all outputs parameters / Mestre

Thesis (M. For. Sc.)--University of Canterbury, 2009. / Typescript (photocopy). Includes bibliographical references (leaves 42-46). Also available via the World Wide Web.

Author's manuscript for published article. See Additional Links field for link to published version. / Ethylene production by different needle age classes was characterized using a mercuric perchlorate traps in natural populations of two ponderosa pine varieties (Pinus ponderosa var. arizonica [Engelm] Shaw and var. ponderosa Dougl. ex Laws.) and Jeffery pine (Pinus leffrevi Grev. and Balf.). All ozone -exposed populations contained individuals which were symptomatic and asymptomatic with respect to visible ozone injury. Ethylene production of different needle age classes was also characterized in Pinus ponderosa var. ponderosa seedlings grown in open top ozone fumigation chambers. Older age class needles produce more ethylene than younger age class needles. Needles of both P. ponderosa var. ponderosa and P. jeffreyi exhibiting ozone injury in the field produced significantly (p >0.05) higher levels of ethylene than asymptomatic conspecifics. Seedlings exposed to highest treatment level of ozone in the fumigation study produced the highest levels of ethylene followed by fumigation with medium and low ozone concentrations and carbon filtered air. These data indicate that measurement of ethylene in conifer needles as a measure of stress needs to be calibrated for needle age class. It also suggests that the sensitivity of a tree to ozone injury may be regulated by the inherent ability of the individual to produce ethylene.

Thesis (Ph. D.)--University of Canterbury, 2007. / Typescript (photocopy). Includes bibliographical references (leaves 178-186). Also available via the World Wide Web.

Thesis (M. Sc.) -- Lincoln University, 2010. / Also available via the World Wide Web.

Thesis (Ph. D.)--University of Canterbury, 2006. / Typescript (photocopy). Includes bibliographical references. Also available via the World Wide Web.