AE911 Truth has prepared a 14 page technical report with the title WORLD TRADE CENTER PHYSICS - Why Constant Acceleration Disproves Progressive Collapse which it has mailed out in time for the 9/11 anniversary to 35,000 senior engineers in government (including NIST), academia and business. It's along similar lines to the report On the Physics of High-Rise Building Collapses published in the latest edition of EurophysicsNews which questions some of the assumptions made by Professor Bazant in his own papers in which he sought to explain how the upper portions of the two WTC towers could have smashed through the bottom portion of the much larger, heavier and sturdier lower portions like a pile driver all the way to the bottom and after reaching the ground intact then destroy themselves, disintegrating in reverse this time from the bottom to top. However, this newer report is somewhat more technical in that the authors (all engineers) work through the engineering formulas and equations with the math displayed to make their point in a presentation more geared to engineering professionals.
Hard copies of the report are available for purchase from AE911Truth for $10 each plus postage. They have also made a free download of the report in PDF format available at the link below, although last time I checked they do require you to leave a name with a physical address and email address to access the download. There is also a request to leave a donation of a few dollars to cover their costs, however the donation is entirely voluntary.
http://us1.campaign-archive1.com/?u=d03bf3ffcac549c7dc7888ef5&id=669d25a1b1&e=[UNIQID]