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A model is presented that describes the heat transfer through a gypsum wallboard partition assembly incorporating the mass transport effects of water in liquid and vapor form. Sources of water include surface bound (adsorbed) water and hydrated water that is chemically bound with the crystal matrix of gypsum. Liberated water is allowed to migrate through the porous structure through molecular diffusion and pressure driven flow. Evaporation or condensation occurs when the partial pressure of water vapor with the pore space is less than or greater than the saturation pressure, respectively. Results obtained from the model are compared to measurements taken during a standard fire resistance test. It is found that the surface temperatures are typically under-predicted, although qualitatively similar behavior is observed. The analysis implies that the liberation and transport of water in both its liquid and vapor form plays a significant role in the thermal response of gypsum wallboard subjected to fire exposures, perhaps even beyond the extent to which the current model has been developed. The model can be used, under the assumptions through which it was developed, to conduct sensitivity studies of the physical parameters and evaluate the effect upon the fire resistance of the system.

From the author of Abhorsen comes classic fantasy set in a world dominated Heat and Mass Transfer Through Gypsum Partitions Subjected to Fire Exposures download epub by the Ragwitch, a being of sinister, destructive intent. Quiet, easygoing Paul never expected to be cast in the role of savior. But his strong-willed sister, Julia, has come under the thrall of the Ragwitch, and Paul himself is drawn not only into the creature's world but into a battle for Julia's very existence -- as well as his own. The only wayDetective Alex Cross is one of the first on the scene of the biggest case he's ever been part of. The President's son and daughter have been abducted from their school - an impossible crime, but somehow the kidnapper has done it. Alex does everything he can but is shunted to the fringes of the investigation. Someone powerful doesn't want Cross too close.To stop Alex CrossA deadly contagion in the DC water supply threatens to cripple the capital, and Alex sees the looming shape of the most devastating attack the United States has ever experienced. He is already working flat-out on the abduction, and this massive assault pushes Cross completely over the edge.Is to kill himWith each hour that passes, the chance of finding the children alive diminishes. In an emotional private meeting, the First Lady asks Alex to please save her kids. Even the highest security clearance doesn't get him any closer to the kidnapper - and Alex makes a desperate decision that goes against everything he believes. A full-throttle thriller with unstoppable action, unrestrained emotion, and relentless suspense, Kill Alex Cross is the most gripping Alex Cross novel James Patterson has ever written.

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Author: Scott Kukuck,U S Department of Commerce- Nist
Number of Pages: 28 pages
Published Date: 31 Aug 2009
Publisher: Createspace
Publication Country: United States
Language: English
ISBN: 9781495919893
Download Link: Click Here
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