901 resultados para Liquidi infiammabili, pool fire, tank fire, FDS, modelli a fiamma solida
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v. 1. 1729-1839.--v. 2. 1840-1848.--v. 3. 1849-1854.--v. 4. 1855-1864.--v. 5. 1865-1875.
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Mode of access: Internet.
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Mode of access: Internet.
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Includes bibliographical references (p. 41).
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Mode of access: Internet.
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"May, 1960."
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Mode of access: Internet.
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Distributed to some depository libraries in microfiche.
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"NFA-SM-FSSP"--Cover.
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Appears to be the same as the original 1973 edition except for the larger size and the addition of the U.S. Fire Administration's single-page "Information Update" dated September 1989 and inserted between pages [viii] and ix. The information update presents corrections to certain statistical data.
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Mode of access: Internet.
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"IB 13-1."
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"December 1996."
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Fires are integral to the healthy functioning of most ecosystems and are often poorly understood in policy and management, however, the relationship between floristic composition and habitat structure is intrinsically linked, particularly after fire. The aim of this study was to test whether the variability of habitat structure or floristic composition and abundance in forests at a regional scale can be explained in terms of fire frequency using historical data and experimental prescribed burns. We tested this hypothesis in open eucalypt forests of Fraser Island off the east coast of Australia. Fraser Island dunes show progressive stages in plant succession as access to nutrients decreases across the Island. We found that fire frequency was not a good predictor of floristic composition or abundance across dune systems; rather, its affects were dune specific. In contrast, habitat structure was strongly influenced by fire frequency, independent of dune system. A dense understorey occurred in frequently burnt areas, whereas infrequently burnt areas had a more even distribution of plant heights. Plant communities returned to pre-burn levels of composition and abundances within 6 months of a fire and frequently burnt areas were dominated by early successional species of plant. These ecosystems were characterized by low diversity and frequently burnt areas on the east coast were dominated by Pteridium. Greater midstorey canopy cover in low frequency areas reduces light penetration and allows other species to compete more effectively with Pteridium. Our results strongly indicate that frequent fires on the Island have resulted in a decrease in relative diversity through dominance of several species. Prescribed fire represents a powerful management tool to shape habitat structure and complexity of Fraser Island forests.