Citat:
Så typiskt enfaldiga konspirationstroende, att kasta ur sig påståenden som inte stämmer, är lögner, fast det är så lätt att hitta korrekta fakta...
Du har käpprätt fel när du påstår att man inte undersökte om det varit explosiva material som detonerat i WTC7, för det gjorde man och det tar ca 30 sekunder att hitta fakta om det på nätet, men det klarade alltså inte du utan kastade istället fram ett falskt påstående. Du är verkligen en tillgång för de konspirationstroende.....
NIST undersökte alltså om det kan ha förekommit explosiver som bidragit till kollapsen, men då man inte ens kunde se att det fanns några spår av sådant initialt, inte fanns någon anledning att misstänka att explosivare varit inblandade i kollapsen, så fanns det heller ingen anledning att slösa tid resurser och pengar på att analysera rasmasarna i jakt på spår efter explosiver.
Läs och gråt...
Citat:
13. Did investigators consider the possibility that an explosion caused or contributed to the collapse of WTC 7?
Yes, this possibility was investigated carefully. NIST concluded that blast events inside the building did not occur and found no evidence supporting the existence of a blast event.
In addition, no blast sounds were heard on the audio tracks of video recordings during the collapse of WTC 7 or reported by witnesses. According to calculations by the investigation team, the smallest blast capable of failing the building's critical column would have resulted in a sound level of 130 decibels (dB) to 140 dB at a distance of at least half a mile, if unobstructed by surrounding buildings. This sound level is consistent with a gunshot blast, standing next to a jet plane engine, and more than 10 times louder than being in front of the speakers at a rock concert.
For the building to have been prepared for intentional demolition, walls and/or column enclosures and fireproofing would have to be removed and replaced without being detected. Preparing a column includes steps such as cutting sections with torches, which produces noxious and odorous fumes. Intentional demolition usually requires applying explosive charges to most, if not all, interior columns, not just one or a limited set of columns in a building.
14. Is it possible that thermite or thermate contributed to the collapse of WTC 7?
NIST has looked at the application and use of thermite and has determined that it was highly unlikely that it could have been used to sever columns in WTC 7 on Sept. 11, 2001.
Thermite is a combination of aluminum powder and a metal oxide that releases a tremendous amount of heat when ignited. It is typically used to weld railroad rails together by melting a small quantity of steel and pouring the melted steel into a form between the two rails. Thermate also contains sulfur and sometimes barium nitrate, both of which increase the compound’s thermal effect, create flame in burning, and significantly reduce the ignition temperature.
To apply thermite to a large steel column, approximately 0.13 lb. of thermite would be needed to heat and melt each pound of steel. For a steel column that weighs approximately 1,000 lbs. per foot, at least 100 lbs. of thermite would need to be placed around the column, ignited, and remain in contact with the vertical steel surface as the thermite reaction took place. This is for one column; presumably, more than one column would have been prepared with thermite, if this approach were to be used.
It is unlikely that 100 lbs. of thermite, or more, could have been carried into WTC 7 and placed around columns without being detected, either prior to Sept. 11, 2001, or during that day.
Given the fires that were observed that day, and the demonstrated structural response to the fires, NIST does not believe that thermite or thermate was used to fail any columns in WTC 7.
Analysis of the WTC steel for the elements in thermite/thermate would not necessarily have been conclusive. The metal compounds also would have been present in the construction materials making up the WTC buildings, and sulfur is present in the gypsum wallboard used for interior partitions.
15. What about claims that the U.S. Geological Survey (USGS) and the U.S. Environmental Protection Agency (EPA) found metallic residues that are evidence of thermite in dust and air samples, respectively, taken from the WTC area after Sept. 11, 2001?
There has not been any conclusive evidence presented to indicate that highly reactive pyrotechnic material was present in the debris of WTC 7. The studies that have been conducted to document trace metals, organic compounds, and other materials in the dust and air from the vicinity of the WTC disaster have all suggested common sources for these items. For example, in a published report from the USGS on an analysis of WTC dust, the authors state that "... the trace metal compositions of the dust and girder coatings likely reflect contributions of material from a wide variety of sources. Possibilities include metals that might be found as pigments in paints (such as titanium, molybdenum, lead, and iron), or metals that occur as traces in, or as major components of, wallboard, concrete, aggregate, copper piping, electrical wiring, and computer equipment.” 2
In a second example, researchers at the EPA measured the concentrations of 60 organic compounds in air samples from Ground Zero using an organic gas and particle sampler. The presence of one of these compounds, 1,3-diphenylpropane, has been suggested as evidence of thermite. However, the authors of the EPA paper state in the opening paragraph that although “… this species has not previously been reported from ambient sampling … it has been associated with polystyrene and other plastics, which are in abundance at the WTC site.” 3
Yes, this possibility was investigated carefully. NIST concluded that blast events inside the building did not occur and found no evidence supporting the existence of a blast event.
In addition, no blast sounds were heard on the audio tracks of video recordings during the collapse of WTC 7 or reported by witnesses. According to calculations by the investigation team, the smallest blast capable of failing the building's critical column would have resulted in a sound level of 130 decibels (dB) to 140 dB at a distance of at least half a mile, if unobstructed by surrounding buildings. This sound level is consistent with a gunshot blast, standing next to a jet plane engine, and more than 10 times louder than being in front of the speakers at a rock concert.
For the building to have been prepared for intentional demolition, walls and/or column enclosures and fireproofing would have to be removed and replaced without being detected. Preparing a column includes steps such as cutting sections with torches, which produces noxious and odorous fumes. Intentional demolition usually requires applying explosive charges to most, if not all, interior columns, not just one or a limited set of columns in a building.
14. Is it possible that thermite or thermate contributed to the collapse of WTC 7?
NIST has looked at the application and use of thermite and has determined that it was highly unlikely that it could have been used to sever columns in WTC 7 on Sept. 11, 2001.
Thermite is a combination of aluminum powder and a metal oxide that releases a tremendous amount of heat when ignited. It is typically used to weld railroad rails together by melting a small quantity of steel and pouring the melted steel into a form between the two rails. Thermate also contains sulfur and sometimes barium nitrate, both of which increase the compound’s thermal effect, create flame in burning, and significantly reduce the ignition temperature.
To apply thermite to a large steel column, approximately 0.13 lb. of thermite would be needed to heat and melt each pound of steel. For a steel column that weighs approximately 1,000 lbs. per foot, at least 100 lbs. of thermite would need to be placed around the column, ignited, and remain in contact with the vertical steel surface as the thermite reaction took place. This is for one column; presumably, more than one column would have been prepared with thermite, if this approach were to be used.
It is unlikely that 100 lbs. of thermite, or more, could have been carried into WTC 7 and placed around columns without being detected, either prior to Sept. 11, 2001, or during that day.
Given the fires that were observed that day, and the demonstrated structural response to the fires, NIST does not believe that thermite or thermate was used to fail any columns in WTC 7.
Analysis of the WTC steel for the elements in thermite/thermate would not necessarily have been conclusive. The metal compounds also would have been present in the construction materials making up the WTC buildings, and sulfur is present in the gypsum wallboard used for interior partitions.
15. What about claims that the U.S. Geological Survey (USGS) and the U.S. Environmental Protection Agency (EPA) found metallic residues that are evidence of thermite in dust and air samples, respectively, taken from the WTC area after Sept. 11, 2001?
There has not been any conclusive evidence presented to indicate that highly reactive pyrotechnic material was present in the debris of WTC 7. The studies that have been conducted to document trace metals, organic compounds, and other materials in the dust and air from the vicinity of the WTC disaster have all suggested common sources for these items. For example, in a published report from the USGS on an analysis of WTC dust, the authors state that "... the trace metal compositions of the dust and girder coatings likely reflect contributions of material from a wide variety of sources. Possibilities include metals that might be found as pigments in paints (such as titanium, molybdenum, lead, and iron), or metals that occur as traces in, or as major components of, wallboard, concrete, aggregate, copper piping, electrical wiring, and computer equipment.” 2
In a second example, researchers at the EPA measured the concentrations of 60 organic compounds in air samples from Ground Zero using an organic gas and particle sampler. The presence of one of these compounds, 1,3-diphenylpropane, has been suggested as evidence of thermite. However, the authors of the EPA paper state in the opening paragraph that although “… this species has not previously been reported from ambient sampling … it has been associated with polystyrene and other plastics, which are in abundance at the WTC site.” 3
Källa: http://www.nist.gov/el/disasterstudi.../faqs_wtc7.cfm
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Senast redigerad av Dr Tinnitus 2015-12-06 kl. 12:57.
Senast redigerad av Dr Tinnitus 2015-12-06 kl. 12:57.
