• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 770
  • 584
  • 110
  • 80
  • 71
  • 38
  • 26
  • 22
  • 20
  • 16
  • 16
  • 14
  • 10
  • 9
  • 8
  • Tagged with
  • 2075
  • 443
  • 298
  • 210
  • 169
  • 164
  • 156
  • 146
  • 144
  • 139
  • 135
  • 130
  • 117
  • 116
  • 111
  • 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.
151

Experimental and analytical investigation of the effect of autofrettage on fatique damage development in blocks containing crossbores under cyclic internal pressure /

Yang, Shuilong. January 1995 (has links)
Thesis (Ph.D.)--University of Tulsa, 1995. / Includes bibliographical references (leaves 209-217).
152

Experimental and analytical investigation of the effect of autofrettage on fatique damage development in blocks containing crossbores under cyclic internal pressure /

Yang, Shuilong. January 1995 (has links)
Thesis (Ph.D.)--University of Tulsa, 1995. / Includes bibliographical references (leaves 209-217).
153

Investigation of postweld heat treatment of quenched and tempered pressure vessel steels

Sterjovski, Zoran. January 2003 (has links)
Thesis (Ph.D.)--University of Wollongong, 2003. / Typescript. Includes appendices. Bibliographical references: leaf 251-266.
154

Pesticide use in rice cultivation in Tarapoto, Peru : pesticide residues in blood of farmers, usage behaviour, and health care practices /

Lange, Gun, January 2006 (has links) (PDF)
Examensarbete.
155

Effect of dislocation density on residual stress in polycrystalline silicon wafers

Garcia, Victoria. January 2008 (has links)
Thesis (M. S.)--Mechanical Engineering, Georgia Institute of Technology, 2008. / Committee Chair: Danyluk, Steven; Committee Member: Melkote, Shreyes; Committee Member: Rohatgi, Ajeet.
156

Determination of residual stresses in HSLA-100 steel weldments as a function of welding parameters using x-ray diffraction /

Cunningham, David R., January 1994 (has links)
Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1994. / Vita. Abstract. Includes bibliographical references (leaves 65-68). Also available via the Internet.
157

Predicted residual strength of damaged IsoTruss® structures /

Carroll, Travis S., January 2006 (has links) (PDF)
Thesis (M.S.)--Brigham Young University. Dept. of Civil and Environmental Engineering, 2006. / Includes bibliographical references (p. 235-236).
158

Finite element modeling of hard turning

Al-Zkeri, Ibrahim Abdullah, January 2007 (has links)
Thesis (Ph. D.)--Ohio State University, 2007. / Title from first page of PDF file. Includes bibliographical references (p. 201-215).
159

Atributos químicos e crescimento de plantas em solos com aplicação de resíduos urbanos / Chemical attributes and plant growth in soils with urban wastes application

Garcia, Gabriel Furtado January 2016 (has links)
O uso de composto de lixo (CL) e de lodo de esgoto (LE) na agricultura é uma alternativa viável para a melhor disposição destes resíduos urbanos em solos. Estudos de longo prazo podem melhorar o entendimento da dinâmica e as modificações que estes materiais ocasionam no solo e na resposta de plantas. O objetivo desse estudo foi avaliar os efeitos residuais (aplicações entre 2002 e 2006) e imediatos (reaplicação em 2015, após pousio) dos resíduos CL e LE, em dois solos [Latossolo Vermelho distroférrico (LVd) e um Argissolo Vermelho distrófico (PVd)], quanto às modificações em atributos químicos do solo, elementos-traços (ET) e resposta de plantas de aveia (Avena sativa) e milho (Zea mays). O experimento consta de colunas de solo, com aplicação de duas doses dos resíduos, CL e LE, com base no suprimento de nitrogênio, sendo a maior repetida e enriquecida com ET (Cd, Cu, Ni, Pb e Zn), além de tratamentos com adubação mineral e testemunha. Quanto aos efeitos residuais, na camada de 0-20 cm de ambos os solos, os resíduos promoveram maiores teores de C orgânico e P disponível e valores de CTC, porém o CL resultou em maiores valores de pH do solo. Com exceção do Cu, os teores de ET no solo diminuíram com o tempo. A produção de matéria seca de aveia diminuiu expressivamente após o longo período de pousio, possivelmente pela limitação em N. Os tratamentos com LE enriquecido com ET resultaram em maior acúmulo destes elementos na parte aérea da aveia. Após a reaplicação dos resíduos, o LE resultou em maior produção de matéria seca e maior acúmulo de macronutrientes (N, P, Ca e Mg) pelas plantas de milho em comparação ao CL. Os tratamentos com CL e LE enriquecidos determinaram nas plantas teores de ETS não essenciais considerados fitotóxicos. / The use of urban solid waste compost (SWC) and sewage sludge (SS) in agriculture is a viable alternative for better disposal of these urban residues in soils. Long-term studies may improve the understanding of the dynamic and changes caused by these materials in soils and plant responses. The aim of this study was to evaluate residual effects (applications from 2002 to 2006) and immediate effects (application in 2015, after a fallow time) of SWC and SS residues in two soils [Typic Haplorthox (LVd) and Arenic Paleudult (PVd)], regarding soil chemical attributes and trace elements (ET) and oat (Avena sativa) and corn (Zea mays) plant responses. The experiment is carried out in soil columns with application of two doses of both SWC and SS and also with the major dose enriched with ET (Cd, Cu, Ni, Pb and Zn), besides mineral fertilization and control treatments. Residue doses were established according N supply. Regarding residual effects in the 0-20 cm layer of both soils SWC and SS materials improved organic C and available P contents and CEC values, but soil pH was higher for SWC treatments. Except for Cu, soil ET contents decreases with time. Oat dry matter production was very small after the fallow time possibly due to low residual N supply. Treatments enriched with ET resulted in higher contents of these elements in oat shoots. After residue reapplication SS caused higher corn dry matter production and macronutrient (N, P, Ca and Mg) contents than SWC. Non-essential metal in levels possibly toxic for corn plants resulted from treatments with SWC and SS enriched with ET.
160

Estudo dos solos residuais do planalto meridional do Rio Grande do Sul

Gehling, Wai Ying Yuk January 1982 (has links)
O presente trabalho estuda as propriedades geotécnicas de solos residuais que se situam no Planalto Meridionaldo Rio Grande do Sul, na área pertencente ao chamado grau de Passo Fundo (28°-29°e 52°-53° de Greenwich). O mapeamento geológico mostrou a ocorrência de arenito da Formação Tupanciretã e rochas vulcânicas da Formação Serra Geral, constituídas por basaltos e riodacitos, estes últimos de descrição recente (69,77). Foram coletadas 36 amostras deformadas e 6 blocos indeformados de solos residuais de arenito da Formação Tupanciretã, de riolito e de basalto, situados no horizonte superficiaL abrangendo uma área global de 10.000km2. Realizaram-se análises químicas e mineralógicas, estudos de microscopia eletrônica, ensaios de caracterização, compactação, Índice Suporte Califórnia, compressibilidade, colapsibilidade e resistência, além de um estudo pedológico. Os solos estudados apresentaram características de solos laterítícos, com propriedades particulares que os distinguern dos demais solos do Brasil. Observaram-se diferenças nas propriedades dos solos de arenito em relação aos solos de basalto e riolito. Por fim, procedeu-se a um estudo estatístico, verificando-se a variabilidade entre os resultados obtidos, que demonstraram uma relativa compatibilidade entre as características da rocha mãe e dos solos originados. A partir dos dados obtidos será possível estender a análise às demais áreas da região, com vistas a uma ampliação e sistematização dos estudos de solos vermelhos residuais do Planalto Meridional. / This work presents the geotechnical properties of residual soils located in the Planalto Meridional do Rio Grande do Sul in the area belonging to the so called Passo Fundo Region (289-299 and 529-539 Greenwich). The geological mapping showed the presence of the Tupanciretã Formation, volcanic rocks from the Serra Geral Formation, which according to a recent description (69, 77) are made up of basalts and riodacite. A collection was made of thirty six deforrned samples and six undeformed blocks of residual soils of sandstone from the Tupanciretã Formation and of riolite and basalt, which were located in a horizontal surface covering a global area of 10 .000 km2. The following, types of analyses and tests were performed: mineralogical, chemical, characterization, compaction, California Bearing Ration, compressibility, collapsibility and resistance, in addition to a pedological study. The soils analysed showed lateritic soils characteristics with special properties that single them out with respect to the other Brasilian soils. Differences were observed beb1een the properties of the sandstone and those from basalts and riolite. A quantification of the variability of the results was obtained by means of a statistical analysis of the data, that a relative compatibility between the characteristics of the source rock and its original soils. Using the results obtained extension of their study can be made to other are s in the region in arder to obtain a wider and sistematic view of the residual red soils of the Pla nalto Meridional.

Page generated in 0.0476 seconds