نتایج جستجو برای: fire retarding properties
تعداد نتایج: 910145 فیلتر نتایج به سال:
Although mixed-severity fires are among the most widespread disturbances influencing western North American forests, they remain the least understood. A major question is the degree to which mixed-severity fire regimes are simply an ecological intermediate between lowand high-severity fire regimes, versus a unique disturbance regime with distinct properties. The Klamath-Siskiyou Mountains of so...
Fire is widely used to clear farms in Iran, while there is little information regarding the effects of fire on the characteristics, especially mineralogy of soils. The objectives of the present study were to 1) compare some physico-chemical properties of burned and unburned soils and 2) evaluate minerals transformation in top soil layer resulting from increasing temperature. Soil samples were t...
11 One of the objectives of the present study is to gain a deeper understanding of the heat 12 transfer mechanisms that control the spread of wildfires. Five experimental fires were 13 conducted in the field across on plots of living vegetation. The lengths of the ignition lines 14 were set in the range of 20–30 m to reproduce wildfire front conditions as closely as possible. 15 The experiments...
Fires affect hundreds of millions of hectares annually. Above-ground community composition and diversity after fire have been studied extensively, but effects of fire on soil bacterial communities remain largely unexamined despite the central role of bacteria in ecosystem recovery and functioning. We investigated responses of bacterial community to forest fire in the Greater Khingan Mountains, ...
In the last two decades several deterministic models for predicting fire behaviour have been developed. One of the most common fire growth model is the computer program Farsite (Finney, 1998), based on the Rothermel’s original fire spread equation. Farsite describes the spatial and temporal spread and behaviour of fire under different terrain, fuels, and weather conditions. It is currently used...
Background & Objectives: Educational and research laboratories in universities have a high risk of fire, because they have a variety of materials and equipment. The aim of this study was to provide a technical plan for safety improvement in educational and research laboratories of a university based on the design of automatic detection, alarm, and extinguishing systems . Method...
Forest fire models are generally used in different aspects of fire management and are helpful in understanding and prediction of fire behavior. Forest fires cause a significant damage for public property by destroying a large tract of forest. This helps fire fighters to focus on an area with greater risk and to develop better substructure for fire fighter training and ultimately to plan fire-f...
it is highly desirable to employ biopreservatives of the antioxidant and antimicrobial properties to avoid the side effects associated with the use of synthetic preservatives. cake batters containing essential oil extracts of some such iranian native herbs as: lemon balm (melissa officinalis), camel thorn (alhagi maurorum) and ajwain (trachyspermum copticum), were prepared. the chemical composi...
Live fuel moisture is one of the most important fuel properties and a critical parameter for fire danger rate forecasting and fire behavior analysis. Many approaches have been proposed to retrieve live fuel moisture with satellite remote sensing measurements. In this paper, we presented live fuel moisture retrieval with near real-time MODIS measurements, discussed the applications of real-time ...
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