نتایج جستجو برای: fire

تعداد نتایج: 42820  

2014
Sean A. Parks Marc-André Parisien Carol Miller Solomon Z. Dobrowski

Numerous theoretical and empirical studies have shown that wildfire activity (e.g., area burned) at regional to global scales may be limited at the extremes of environmental gradients such as productivity or moisture. Fire activity, however, represents only one component of the fire regime, and no studies to date have characterized fire severity along such gradients. Given the importance of fir...

2010
Qasim Siddique

Fire modeling is used to understand and to predict possible fire behavior without getting burned. Fire models are used in different aspect of fire management. The increase in the number of forest fires in the last few years has forced governments to take precautions. Beside prevention, early intervention is also very important in fire fighting. If the fire fighters know where the fire will be i...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه علوم کشاورزی و منابع طبیعی ساری - دانشکده علوم کشاورزی 1389

در کشت بافت گیاه آنتوریوم مهمترین و حساس ترین مرحله، کالوس زایی ریزنمونه ها می باشد. بهترین نتایج کالوس زایی برای هر دو رقم در محیط کشت mms حاوی 12/0 میلی گرم در لیتر 2,4-d، 1 میلی گرم در لیتر ba، 3 درصد ساکارز، 7/0 درصد آگار و ph برابر با 1/0 ± 0/6 بدست آمد. رقم fire (7/37 درصد) در مقایسه با رقم midori (6/14 درصد) درصد کالوس زایی بالایی داشت، ریزنمونه برگ (74/37 درصد) در مقایسه با ریزنمونه دمب...

2015
Antonella De Angelis Carlo Ricotta Marco Conedera Gianni Boris Pezzatti

Fire regimes are strongly related to weather conditions that directly and indirectly influence fire ignition and propagation. Identifying the most important meteorological fire drivers is thus fundamental for daily fire risk forecasting. In this context, several fire weather indices have been developed focussing mainly on fire-related local weather conditions and fuel characteristics. The speci...

2014
Rebecca K Yau Stephen W Marshall

BACKGROUND Cigarettes and other tobacco-related smoking products have traditionally been a major ignition source for residential fire deaths. In the United States, all 50 states and the District of Columbia have passed laws requiring that cigarettes self-extinguish if they are not being smoked (so-called fire-safe cigarette laws). The purpose of this study was to quantify the association betwee...

2015
Joel K. Kelso Drew Mellor Mary E. Murphy George J. Milne

A methodology for validating fire spread simulation systems using historical fire data is presented. The key features of this methodology are (a) quantitative comparison between simulator-generated fire perimeters and fire perimeters from an independently produced fire reconstruction at multiple time points during the fire, and (b) extensive sensitivity analyses on simulation variables includin...

2005
Peter Reich

Questions: What is the variability in abundance of lichens on grassland soil between and within fields after prescribed fire? Is post-fire lichen abundance an effect of pre-fire population size? Location: Cedar Creek Natural History Area, Minnesota, USA. Methods: Lichen abundance, estimated as ground cover and dominated by Cladonia spp., was mapped in plots in two fields before prescribed burni...

2013
Catherine T Elliott Sarah B Henderson Victoria Wan

BACKGROUND Several studies have evaluated the association between forest fire smoke and acute exacerbations of respiratory diseases, but few have examined effects on pharmaceutical dispensations. We examine the associations between daily fine particulate matter (PM2.5) and pharmaceutical dispensations for salbutamol in forest fire-affected and non-fire-affected populations in British Columbia (...

2011
E. S. KASISCHKE

A method was developed to estimate carbon consumed during wildland fires in interior Alaska based on mediumspatial scale data (60 m cell size) generated on a daily basis. Carbon consumption estimates were developed for 41 fire events in the large fire year of 2004 and 34 fire events from the small fire years of 2006–2008. Total carbon consumed during the large fire year (2.72 9 10 ha burned) wa...

2016
S. Jayashree D. A. Janeera

Real-time fire detection, alerting and suppression system detects the presence of fire in indoor scenarios by recording the video inside the room via surveillance camera installed. This system introduces an image processing technique through video surveillance to detect the fire using different experts by combining three classifiers based on color, shape and motion of the fire. This detection s...

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