The signal propagation effects on IEEE 802.15.4 radio link in fire environment

2010 ◽  
Author(s):  
Chinthaka M Dissanayake ◽  
Malka N Halgamuge ◽  
K Ramamohanarao ◽  
B Moran ◽  
P Farrell
Keyword(s):  
Ieee 802.15.4 ◽  
Signal Propagation ◽  
Radio Link ◽  
Fire Environment ◽  
Propagation Effects ◽  
In Fire

scholarly journals Modeling and Performance Analysis of Route-Over and Mesh-Under Routing Schemes in 6LoWPAN under Error-Prone Channel Condition

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Tsung-Han Lee ◽  
Hung-Chi Chu ◽  
Lin-Huang Chang ◽  
Hung-Shiou Chiang ◽  
Yen-Wen Lin
Keyword(s):  
Ieee 802.15.4 ◽  
Radio Link ◽  
Area Network ◽  
Protocol Stack ◽  
Channel Condition ◽  
Routing Schemes ◽  
Wireless Personal Area Network ◽  
Ipv6 Protocol ◽  
Personal Area Network ◽  
Low Rate

6LoWPAN technology has attracted extensive attention recently. It is because 6LoWPAN is one of Internet of Things standard and it adapts to IPv6 protocol stack over low-rate wireless personal area network, such as IEEE 802.15.4. One view is that IP architecture is not suitable for low-rate wireless personal area network. It is a challenge to implement the IPv6 protocol stack into IEEE 802.15.4 devices due to that the size of IPv6 packet is much larger than the maximum packet size of IEEE 802.15.4 in data link layer. In order to solve this problem, 6LoWPAN provides header compression to reduce the transmission overhead for IP packets. In addition, two selected routing schemes, mesh-under and route-over routing schemes, are also proposed in 6LoWPAN to forward IP fragmentations under IEEE 802.15.4 radio link. The distinction is based on which layer of the 6LoWPAN protocol stack is in charge of routing decisions. In route-over routing scheme, the routing distinction is taken at the network layer and, in mesh-under, is taken by the adaptation layer. Thus, the goal of this research is to understand the performance of two routing schemes in 6LoWPAN under error-prone channel condition.

Insulation Failure Mechanism of Cable in Fire Environment

2018 ◽  
pp. 909-917
Author(s):  
Qiang Li ◽  
Jiaqing Zhang ◽  
Jinmei Li ◽  
Yichen Yang ◽  
Minghao Fan
Keyword(s):  
Failure Mechanism ◽  
Insulation Failure ◽  
Fire Environment ◽  
In Fire

Spatial and temporal patterns of wildfire ignitions in Canada from 1980 to 2006

2012 ◽  
Vol 21 (3) ◽  
pp. 230 ◽  
Author(s):  
Nicholas J. Gralewicz ◽  
Trisalyn A. Nelson ◽  
Michael A. Wulder
Keyword(s):  
Temporal Patterns ◽  
Spatially Explicit ◽  
Environment Interaction ◽  
Spatial And Temporal Patterns ◽  
Baseline Measure ◽  
Wildfire Occurrence ◽  
Fire Environment ◽  
Ignition Regime ◽  
In Fire ◽  
Fire Ignition

A spatially explicit baseline measure of historic, current and future wildfire ignition expectations is required to monitor and understand changes in fire occurrence, the distribution of which climate change is anticipated to modify. Using spatial–temporal patterns of fire in Canada, we present a method to identify baseline expectations and ignition trends between 1980 and 2006 across 1-km spatial units. Kernel density estimates of wildfire ignitions and temporal trajectory metrics were calculated to describe expected ignition density, variability from expected density, and increasing or decreasing density trends. Baseline ignition expectations and trends were used to create unique fire ignition regimes and assess anthropogenic influence on ignitions. Fire ignition densities decreased exponentially as distance to road or populated place increased, and largest ignition trends occurred closest to both variables. Fire ignition regime delineation was more dependent on human transportation networks than human settlement. These findings provide a unique approach to quantifying ignition expectations. This research highlights the potential of this baseline approach for monitoring efforts and fire–environment interaction research and offers a preliminary spatially explicit model of wildfire occurrence expectations in Canada.

scholarly journals Abruption Cross-Section and Bending Change of ACSR Energy Lines in Fire Environment

2010 ◽  
Vol 2 ◽  
pp. 291630
Author(s):  
C. D. Halevidis ◽  
S. D. Anagnostatos ◽  
A. D. Polykrati ◽  
E. I. Koufakis ◽  
P. D. Bourkas
Keyword(s):  
Cross Section ◽  
Fire Environment ◽  
In Fire

scholarly journals Intermediate Scale Composite Material Fire Testing

2011 ◽  
Author(s):  
Alexander L. Brown ◽  
Amanda B. Dodd ◽  
Brent M. Pickett
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Intermediate Scale ◽  
Thermal Environments ◽  
Fire Environment ◽  
Chemical Products ◽  
Materials Used ◽  
Thermal Intensity ◽  
In Fire ◽  
Carbon Fiber Epoxy

Composite materials are increasingly being used in aviation applications. As the quantity of composite material increases, there is a corresponding need to develop a better understanding of composite material response in fire environments. We have recently developed a program to examine this problem experimentally and computationally. Although Sandia National Laboratories and Air Force Research Laboratories at Tyndall have slightly different focuses, we are collaborating to focus on understanding duration, intensity, and the underlying physics during composite fires, as well as the technology and procedures to safely manage composite fire events. In the past year, we have been performing both small and intermediate scale testing to understand the behavior of composite materials used in aviation applications. The current focus is on a set of intermediate scale tests to generate data useful for understanding the behavior of carbon fiber epoxy composites in adverse thermal environments. A series of tests has been performed in a 90 cm cubic enclosure with 25–40 kg of composite materials to generate a severe fire environment fueled mostly by the composites. Preliminary results of these tests will be reported to provide data on the severity of the environment in terms of thermal intensity, duration, and chemical products.

High-Voltage Lines in Fire Environment

2011 ◽  
Vol 26 (3) ◽  
pp. 2053-2054 ◽  
Author(s):  
Stavros D. Anagnostatos ◽  
Constantinos D. Halevidis ◽  
Aikaterini D. Polykrati ◽  
Emmanuel I. Koufakis ◽  
Perikles D. Bourkas
Keyword(s):  
High Voltage ◽  
Fire Environment ◽  
In Fire
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