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The facade will begin to crack open and pieces will break away and windows will break.
Progressive collapse is a slow buckling of structural support.
en.m.wikipedia.org...
Nuclear weapons Edit
Nuclear weapons use fission as either the partial or the main energy source. Depending on the weapon design and where it is exploded, the relative importance of the fission product radioactivity will vary compared to the activation product radioactivity in the total fallout radioactivity.
The immediate fission products from nuclear weapon fission are essentially the same as those from any other fission source, depending slightly on the particular nuclide that is fissioning. However, the very short time scale for the reaction makes a difference in the particular mix of isotopes produced from an atomic bomb.
For example, the 134Cs/137Cs ratio provides an easy method of distinguishing between fallout from a bomb and the fission products from a power reactor. Almost no Cs-134 is formed by nuclear fission (because xenon-134 is stable). The 134Cs is formed by the neutron activation of the stable 133Cs which is formed by the decay of isotopes in the isobar (A = 133). So in a momentary criticality by the time that the neutron flux becomes zero too little time will have passed for any 133Cs to be present. While in a power reactor plenty of time exists for the decay of the isotopes in the isobar to form 133Cs, the 133Cs thus formed can then be activated to form 134Cs only if the time between the start and the end of the criticality is long.
According to Jiri Hala's textbook,[13] the radioactivity in the fission product mixture in an atom bomb is mostly caused by short-lived isotopes such as I-131 and Ba-140. After about four months Ce-141, Zr-95/Nb-95, and Sr-89 represent the largest share of radioactive material. After two to three years, Ce-144/Pr-144, Ru-106/Rh-106, and Promethium-147 are the bulk of the radioactivity. After a few years, the radiation is dominated by strontium-90 and caesium-137, whereas in the period between 10,000 and a million years it is technetium-99 that dominates.
Progressive collapse is a slow buckling of structural support.
Demolition by hydraulic jacks
m.youtube.com...
m.youtube.com...
DEMOLITION PAR VERINAGE A VITRY SUR SEINE
originally posted by: neutronflux
a reply to: Hulseyreport
Ok? So you cannot create a credible counter argument to what I posted.
There is no evidence of detonations with the force to cut steel columns to initiate collapse.
You said WTC 7 had 84 columns? There is no evidence of thermite burning on 84 columns on 47 floors to initiate collapse.
You claimed cut columns made the facade fall at the rate of free fall? Please explain, or quote Hulsey / Architects and Engineers, what charges were used. The number of charges used. Where the charges were placed. And why there is no evidence of columns being cut in the video, audio, seismic evidence. Especially when the exterior columns were right at the windows. When there was no windows blown out from a pressure wave indicative of a force strong enough to cut steel columns. No shrapnel indicative of columns being cut. No visible burning, flashing, splattering of thermite burning that should have cut into the facade.
Why is this so hard for you?
originally posted by: neutronflux
a reply to: Hulseyreport
You
Why is this so hard for you?
One, NIST never said they were absolutely right. The NIST model is a best guess.
Two. The Hulsey’s report made an absolute claim that is impossible to prove. And it was predetermined. Fire could not cause collapse. It ignores the WTC 5 failures. The Hulsey model was limited to modeling very specific areas in WTC 7. And did not include a global WTC 7 model of the fire. The Hulsey model doesn’t contain key features of the WTC 7 collapse. The Hulsey model was forced, with no explanation what would make columns disappear in real life like what Hulsey modeled.
Three. The most important item. Hulsey/ you cannot provide any proof detonations cut columns. Especially for the exterior columns right at the windows of the facade.
No proof of detonations provided. No explanation what explosives were used. No explanation where they were place. No evidence of columns cut to initiate the collapse of WTC 7.
Hulsey/Architects and Engineers have nothing to convey? They provide no actual explanation for collapse initiation. Can you quote something I missed. So, how can I find a collapse initiation that is not stated by Hulsey, with no evidence of detonations initiating collapse from the video, audio evidence more credible than NIST model that shows thermal stress on the global scale of WTC 7 could initiate a collapse.
It was not a predetermined analysis.
h
www.metabunk.org/debunked-uaf-study-shows-wtc7-could-not-have-collapsed-from-fire.t9056/
www.metabunk.org...
The study is unfinished. Nothing has been published other than Dr. Hulsey giving a presentation on YouTube, and a pdf file of the slides for that presentation.
Date of post
SEP 2917
www.metabunk.org...
originally posted by: neutronflux
a reply to: Hulseyreport
You
It was not a predetermined analysis.
Whole thread proves you wrong
h
www.metabunk.org/debunked-uaf-study-shows-wtc7-could-not-have-collapsed-from-fire.t9056/
www.metabunk.org...
The study is unfinished. Nothing has been published other than Dr. Hulsey giving a presentation on YouTube, and a pdf file of the slides for that presentation.
Date of post
SEP 2917
www.metabunk.org...
I didn’t know the Hulsey report is completed and published. It’s still open for public comment.
originally posted by: neutronflux
a reply to: Hulseyreport
What real life event would make columns instantaneously disappear like the Hulsey model?
Can you cite actual evidence detonations initiated the WTC 7 collapse?
originally posted by: Hulseyreport
originally posted by: neutronflux
a reply to: Hulseyreport
You
It was not a predetermined analysis.
Whole thread proves you wrong
h
www.metabunk.org/debunked-uaf-study-shows-wtc7-could-not-have-collapsed-from-fire.t9056/
www.metabunk.org...
The study is unfinished. Nothing has been published other than Dr. Hulsey giving a presentation on YouTube, and a pdf file of the slides for that presentation.
Date of post
SEP 2917
www.metabunk.org...
I didn’t know the Hulsey report is completed and published. It’s still open for public comment.
False.
600 gigs of data came out weeks ago.
It open for community comments to question their conclusions. Hulsey distributed the data so individuals can go through the work and comment.
NIST released 20 percent of their data and kept 80 percent secret. 80 percent was the most important parts.
Can't ignore freefall- its smoking gun that NIST overlooked and rebuffed .
11. In a video, it appears that WTC 7 is descending in free fall, something that would not occur in the structural collapse that you describe. How can NIST ignore basic laws of physics?
In the draft WTC 7 report (released Aug. 21, 2008; available at www.nist.gov...), NIST stated that the north face of the building descended 18 stories (the portion of the collapse visible in the video) in 5.4 seconds, based on video analysis of the building collapse. This time period is 40 percent longer than the 3.9 seconds this process would have taken if the north face of the building had descended solely under free fall conditions. During the public comment period on the draft report, NIST was asked to confirm this time difference and define the reasons for it in greater detail.
To further clarify the descent of the north face, NIST recorded the downward displacement of a point near the center of the roofline from first movement until the north face was no longer visible in the video. Numerical analyses were conducted to calculate the velocity and acceleration of the roofline point from the time-dependent displacement data. The instant at which vertical motion of the roofline first occurred was determined by tracking the numerical value of the brightness of a pixel (a single element in the video image) at the roofline. This pixel became brighter as the roofline began to descend because the color of the pixel started to change from that of the building façade to the lighter color of the sky.
The approach taken by NIST is summarized in NIST NCSTAR Report 1A, Section 3.6, and detailed in NIST NCSTAR Report 1-9, Section 12.5.3.
The analyses of the video (both the estimation of the instant the roofline began to descend and the calculated velocity and acceleration of a point on the roofline) revealed three distinct stages characterizing the 5.4 seconds of collapse:
Stage 1 (0 to 1.75 seconds): acceleration less than that of gravity (i.e., slower than free fall).
Stage 2 (1.75 to 4.0 seconds): gravitational acceleration (free fall)
Stage 3 (4.0 to 5.4 seconds): decreased acceleration, again less than that of gravity
This analysis showed that the 40 percent longer descent time—compared to the 3.9 second free fall time—was due primarily to Stage 1, which corresponded to the buckling of the exterior columns in the lower stories of the north face. During Stage 2, the north face descended essentially in free fall, indicating negligible support from the structure below. This is consistent with the structural analysis model, which showed the exterior columns buckling and losing their capacity to support the loads from the structure above. In Stage 3, the acceleration decreased as the upper portion of the north face encountered increased resistance from the collapsed structure and the debris pile below.