The Experts below are selected from a list of 1014 Experts worldwide ranked by ideXlab platform
James G. Quintiere - One of the best experts on this subject based on the ideXlab platform.
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QUESTIONS ON THE WTC INVESTIGATION WTC QUESTIONS
2013Co-Authors: James G. QuintiereAbstract:Abstract- A critique of the World Trade Center investigation with respect to the cause of the collapse of towers 1 and 2 is presented. The official investigation conducted by the National Institute of Standards and Technology (NIST) concluded that the collapse was due to the fires heating the core columns that were stripped of insulation by the aircraft impacts. An alternative cause is considered that puts the cause on insufficient insulation of the steel truss floor members. Evidence for the latter is supported by NIST analysis of a truss member, Underwriter Laboratory furnace tests of the floor assembly, and engineering calculations and scale model tests conducted at the University of Maryland. The presentation is couched in terms of 10 questions for NIST
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Questions on the WTC Investigation
Resilience of Cities to Terrorist and other Threats, 1Co-Authors: James G. QuintiereAbstract:A critique of the World Trade Center investigation with respect to the cause of the collapse of towers 1 and 2 is presented. The official investigation conducted by the National Institute of Standards and Technology (NIST) concluded that the collapse was due to the fires heating the core columns that were stripped of insulation by the aircraft impacts. An alternative cause is considered that puts the cause on insufficient insulation of the steel truss floor members. Evidence for the latter is supported by NIST analysis of a truss member, Underwriter Laboratory furnace tests of the floor assembly, and engineering calculations and scale model tests conducted at the University of Maryland. The presentation is couched in terms of 10 questions for NIST.
Kunihiko Takeda - One of the best experts on this subject based on the ideXlab platform.
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Effect of Perfluoroalkane Sulfonic Acid on the Flame Retardancy of Polycarbonate
Journal of Macromolecular Science Part A, 2004Co-Authors: Tomoyuki Ishikawa, Ikuhiro Maki, Tomokazu Koshizuka, Tomohiro Ohkawa, Kunihiko TakedaAbstract:Abstract The effect of perfluoroalkane sulfonic acid on the flame retardancy of polycarbonate (PC) has been studied. In particular, the very small amount of additives to restrain the combustion, as well as the thermal degradation path, was focused on. The flaming combustion times of PC blended with 100 ppm of the strong acid salts by the Underwriter Laboratory (UL)‐test were less than 5 sec, which satisfied the V‐0 level of the UL‐94 test. The ignition times of the UL test did not change remarkably, but those observed in a cone calorimeter test clearly got shorter. Referring to the results of thermal and elemental analyses, the process by which PC was shown excellent flame retardancy is not dehydration and subsequent char‐formation, but includes different scission routes. In particular, the flame retardancy strongly depends on the scission of the isopropylidene group on the main chain.
Tomoyuki Ishikawa - One of the best experts on this subject based on the ideXlab platform.
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Effect of Perfluoroalkane Sulfonic Acid on the Flame Retardancy of Polycarbonate
Journal of Macromolecular Science Part A, 2004Co-Authors: Tomoyuki Ishikawa, Ikuhiro Maki, Tomokazu Koshizuka, Tomohiro Ohkawa, Kunihiko TakedaAbstract:Abstract The effect of perfluoroalkane sulfonic acid on the flame retardancy of polycarbonate (PC) has been studied. In particular, the very small amount of additives to restrain the combustion, as well as the thermal degradation path, was focused on. The flaming combustion times of PC blended with 100 ppm of the strong acid salts by the Underwriter Laboratory (UL)‐test were less than 5 sec, which satisfied the V‐0 level of the UL‐94 test. The ignition times of the UL test did not change remarkably, but those observed in a cone calorimeter test clearly got shorter. Referring to the results of thermal and elemental analyses, the process by which PC was shown excellent flame retardancy is not dehydration and subsequent char‐formation, but includes different scission routes. In particular, the flame retardancy strongly depends on the scission of the isopropylidene group on the main chain.
Ikuhiro Maki - One of the best experts on this subject based on the ideXlab platform.
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Effect of Perfluoroalkane Sulfonic Acid on the Flame Retardancy of Polycarbonate
Journal of Macromolecular Science Part A, 2004Co-Authors: Tomoyuki Ishikawa, Ikuhiro Maki, Tomokazu Koshizuka, Tomohiro Ohkawa, Kunihiko TakedaAbstract:Abstract The effect of perfluoroalkane sulfonic acid on the flame retardancy of polycarbonate (PC) has been studied. In particular, the very small amount of additives to restrain the combustion, as well as the thermal degradation path, was focused on. The flaming combustion times of PC blended with 100 ppm of the strong acid salts by the Underwriter Laboratory (UL)‐test were less than 5 sec, which satisfied the V‐0 level of the UL‐94 test. The ignition times of the UL test did not change remarkably, but those observed in a cone calorimeter test clearly got shorter. Referring to the results of thermal and elemental analyses, the process by which PC was shown excellent flame retardancy is not dehydration and subsequent char‐formation, but includes different scission routes. In particular, the flame retardancy strongly depends on the scission of the isopropylidene group on the main chain.
Tomokazu Koshizuka - One of the best experts on this subject based on the ideXlab platform.
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Effect of Perfluoroalkane Sulfonic Acid on the Flame Retardancy of Polycarbonate
Journal of Macromolecular Science Part A, 2004Co-Authors: Tomoyuki Ishikawa, Ikuhiro Maki, Tomokazu Koshizuka, Tomohiro Ohkawa, Kunihiko TakedaAbstract:Abstract The effect of perfluoroalkane sulfonic acid on the flame retardancy of polycarbonate (PC) has been studied. In particular, the very small amount of additives to restrain the combustion, as well as the thermal degradation path, was focused on. The flaming combustion times of PC blended with 100 ppm of the strong acid salts by the Underwriter Laboratory (UL)‐test were less than 5 sec, which satisfied the V‐0 level of the UL‐94 test. The ignition times of the UL test did not change remarkably, but those observed in a cone calorimeter test clearly got shorter. Referring to the results of thermal and elemental analyses, the process by which PC was shown excellent flame retardancy is not dehydration and subsequent char‐formation, but includes different scission routes. In particular, the flame retardancy strongly depends on the scission of the isopropylidene group on the main chain.
