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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.
41

Fire ecology and management in plant communities of Malheur National Wildlife Refuge, southeastern Oregon /

Young, Richard Paul, January 1986 (has links)
Thesis (Ph. D.)--Oregon State University, 1987. / Typescript (photocopy). Includes bibliographical references (leaves 147-158). Also available on the World Wide Web.
42

Structural Integrity of Polymer Matrix Composites Exposed to Fire Conditions

Bausano, John Vincent 16 May 2006 (has links)
Polymer matrix composites (PMC's) perform well under many loading conditions and situations. Exposure of PMC's to fire is a concern due to their inherent material degradation at elevated temperatures. The elevated temperature response of PMC's to combined thermal and mechanical loads are especially of concern. PMC thermal and mechanical properties undergo transformations at elevated temperatures. Some of these effects are reversible if the maximum temperatures are lower than approximately 200C. The stiffness is significantly reduced at elevated temperatures but if the applied temperature is under the thermal degradation temperature of the matrix, the stiffness should be recoverable upon cooling. Some effects like the endothermic decomposition of the matrix are not reversible effects. This study focuses on reversible properties in the temperature range from room temperature to about 200C. Thermally these effects alter the thermal conductivity and specific heat. Reversible elastic effects considered are the off axis stiffness reductions as functions of temperatures. Thermal profile predictions were conducted using a finite difference code that included convection and radiation effects on the front and back faces of the composite. These predictions were shown to be in good agreement with experimental data. A modified classic laminate analysis (CLT) was implemented to predict the failure times of the composites under combined thermal and mechanical loading. The Budiansky-Fleck micro-buckling analysis technique was used as the failure function of the [0] surface plies. A finite element analysis (FEA) analysis was also performed and showed good agreement with the experimental data. / Master of Science
43

Mathematical modeling of fire /

Green, Terrell J. January 1987 (has links)
No description available.
44

Field modelling of flame spread for enclosure fires

Lewis, M. J. January 1998 (has links)
No description available.
45

Fire-Resistant Landscaping

Deneke, Fred 08 1900 (has links)
4 pp.
46

Fire Safety for Wildland Homes

Deneke, Fred 08 1900 (has links)
3 pp. / This article gives information about fire protection in rural areas and explains how a homeowner can protect his home. It provides tips for evacuating one's home and defending it.
47

Fire-Resistant Landscaping

DeGomez, Tom, Jones, Chris 02 1900 (has links)
Revised; Original Published: 2002 / 4 pp.
48

Fire Safety for Wildland Homes

DeGomez, Tom, Jones, Chris 02 1900 (has links)
Revised; Original Published: 2002 / 4 pp.
49

Analysis of simple connections in steel structures subjected to natural fires

Hanus, Fraçois 06 July 2010 (has links)
Until recently, investigations on the fire resistance of steel joints have been neglected by structural engineers under the arguments that the design resistance of connections at room temperature is usually higher than the resistance of the connected members and that the temperature increases more slowly in the joint zone (high concentration of mass, low exposure to radiative fluxes) than in the adjacent beams and columns. However, brittle failures of connection components have been observed especially during the cooling phase of real fires for two main reasons: the high sensitive and nonreversible character of the resistance of bolts and welds at elevated temperatures and the development of high tensile thrusts. The present thesis is a contribution to the understanding of the thermomechanical behaviour of simple connections in steel beam-to-column joints subjected to natural fire conditions, with a special attention to the behaviour of these connections during the cooling phase. The distribution of temperature in joints has been analysed by use of numerical models built in SAFIR software. The simplified methods presently mentioned in the Eurocodes are discussed and new methods, calibrated on the results of numerical simulations, are proposed in the present work to predict the temperature profile in steel beams and joints covered by a flat concrete slab under fire. An existing method aimed at evaluating the distribution of internal forces in restrained steel beams (and by extension, in joints) under natural fire has been analysed in detail. Several modifications have been added in order to improve his method and to extend its field of application. The final version of this analytical method has been implemented and validated against numerical results. An experimental programme aimed at characterising the mechanical behaviour of bolts and welds under heating and subsequent cooling is described in the present thesis. The properties of the tested specimens, the thermal loading applied to these specimens, the test set-ups and the results of the tests are reported in detail. Mechanical models for bolts loaded in tension or in shear have been calibrated on the experimental results. The loss of resistance of bolts and welds due to their non-reversible behaviour under heating and subsequent cooling has been quantified. Finally, a large part of the thesis is dedicated to the development of component-based models representing the action of common simple connections under natural fire conditions and to the analysis of the behaviour of these connections as a part of a sub-structure or large-scale structure. These simple models can be used for parametric analyses because it conciliate a reasonable time of definition of the data, an acceptable time of simulation and a good degree of accuracy of the results. Recommendations for the design of connections have been defined. The ductility of connections has a major influence on the occurrence of connection failures and classes of ductility for connections, dependant of the fire loading, have been defined in this work. / Jusque très récemment, la recherche sur la résistance au feu des assemblages métalliques a été délaissée par les ingénieurs sous le prétexte que la résistance de calcul des assemblages à froid est habituellement supérieure à celle des éléments connectés et que léchauffement est plus lent dans la zone dassemblage que dans les poutres et colonnes adjacentes (grande concentration de matière, exposition réduite aux flux radiatifs). Toutefois, les ruptures fragiles de composants dassemblages sont observées, notamment durant la phase de refroidissement pour deux raisons principales : caractère sensible et non-réversible des boulons et des soudures aux élévations de température et apparition defforts de traction importants. La présente thèse sinscrit comme une contribution à la compréhension des phénomènes gouvernant le comportement des assemblages simples poutre-poteau sous conditions de feu naturel. Une attention spéciale est portée au comportement de ces assemblages durant la phase de refroidissement. La distribution de température dans les assemblages a été analysée grâce à des modèles numériques mis au point dans le programme SAFIR. Les méthodes simplifiées actuellement mentionées dans les Eurocodes actuels sont discutées et de nouvelles méthodes, calibrées sur les résultats numériques, sont proposées dans ce travail pour prédire le profil de température dans les poutres et assemblages métalliques couverts dune dalle en béton sous feu. Une méthode existante destinée à évaluer la distribution des efforts internes dans les poutres en acier restraintes (et par extension, dans les assemblages) sous feu naturel a été analysée en détail. Plusieurs modifications ont été proposées pour améliorer cette méthode et étendre son champ dapplication. La version finale de cette méthode analytique a été implémentée et validée avec des résultats numériques. Une série de tests expérimentaux destinée à caractériser le comportement mécanique des boulons et des soudures sous échauffement et refroidissement est décrite dans cette présente thèse. Les propriétés des spécimens testés, le traitement thermique qui leur est appliqué, le montage des essais et les résultats obtenus sont rapportés en détail. Des modèles mécaniques pour les boulons soumis à traction ou cisaillement sont calibrés sur les mesures expérimentales. La perte de résistance des boulons et des soudures causée par leur comportement non-réversible sous échauffement et refroidissement a été quantifiée. Finalement, une large part de la thèse a été dédiée au développement de modèles basés sur la méthode des Composantes pour représenter laction des assemblages simples courants sous feu naturel et lanalyse de leur comportement dans une sous-structure ou une structure complète. Ces modèles simples permettent de concilier un temps de définition des données raisonnable, un temps de calcul acceptable et un bon niveau de précision des résultats. Des recommandations pour le dimensionnement des assemblages ont été énoncées. Il est démontré que la ductilité des connections a une influence majeure sur lapparition de ruptures dans les assemblages et des classes de ductilité, dépendant du chargement au feu, ont été définies dans ce travail.
50

Analysis of Radiation Effect from Fire of Fuel Tank

Lin, Mu-Shiung 12 July 2000 (has links)
None

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