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Engineers are still assessing what caused an unusual amount of foam insulation to fall from the central section of the Endeavour's external tank during launching more than two weeks ago.
After the Columbia accident, the investigators who implicated the falling foam as the physical cause demanded that NASA find ways to sharply limit the amount of foam that falls off the external tank.
When the Discovery flew last July on the first mission since the Columbia accident, a greatly reduced but still hazardous amount of foam fell from its redesigned tank during launching.
After the accident, NASA redesigned the shuttle's external fuel tank and greatly reduced the amount of foam that is shed during launching, among other physical changes to the shuttle.
But because of some clever alchemy, the amount of foam on the top increases as you drink it, so that in the end you are left with a thick pile of butterbeer foam that was not there when you started.
But NASA has worked since then to greatly reduce the amount of foam that falls off of the tank during ascent, and it has developed a suite of techniques that might be used to patch the less severe damage to panels and tiles that could be expected today.
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For example, a small amount of foaming agent that contacts with gas can generate foam by disturbing or shaking a liquid (Sheng 2013).
This study describes the effects of raw mix composition, amount of foaming agent, water-solids ratio, steam pressure, and curing time on the characteristics of autoclaved aerated concrete (AAC).
Adding it can help reduce the amount of foaming, but if the mixture hasn't developed much foam by this point, the butter probably won't be necessary.
In the failed balsa core panels there was little or no evidence of balsa remaining on the FRP face sheet, however, in the PVC foam core panels there were ample amounts of foam left on the FRP face sheet.
The circulatory, nutrient, weather and surf conditions that existed in November 2007 favoured an especially intense and prolonged event that produced large amounts of foam from a very large, senescing dinoflagellate bloom by extending the red tide into a period of increased winter swell.
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