The Hindenburg disaster: Combining physics and history in the laboratory

We present the Hindenburg disaster as a case study in the flammability of fabrics. Our goal is to examine the ship’s outer covering and decide whether or not it was the fire’s initial source of fuel. To accomplish this, we piloted a basic vertical flame test with students in an introductory-level undergraduate laboratory. Our test is patterned after the protocol set forth by the American Society for Testing and Materials (ASTM) for determining the flammability of textiles. The case study provides several unique teaching opportunitie

Thank You for Flying the Vomit Comet

This paper describes our flight aboard NASA's C9 Weightless Wonder, more affectionately known as The Vomit Comet. The C9 is NASA's aircraft that creates multiple periods of microgravity by conducting a series of parabolic maneuvers over the Gulf of Mexico

Viscoelastic Properties of a Liquid-Crystalline Monomer and Its Dimer

Quasielastic-light-scattering measurements are reported for a dialkoxyphenylbenzoate monomer and its dimer in their respective nematic phases. The splay and twist elastic moduli of the dimer are found to be nearly independent of molecular length. The dimer\u27s bend modulus, however, shows an anomalous increase with decreasing temperature well below the nematic-isotropic phase transition. Monomer viscosities are consistent with typical literature values, although γ1/ηsplay and ηbend seem to be larger than expected for the dimer, where γ1 is the twist viscosity. The results are discussed in terms of viscoelastic properties of semiflexible rods. The elastic properties in particular are in good agreement with a recent model by Terentjev and Petschek (unpublished)

Entangling quantum measurement and its properties

We study the mathematical structure of superoperators describing quantum measurements, including the \emph{entangling measurement}--the generalization of the standard quantum measurement that results in entanglement between the measurable system and apparatus. It is shown that the coherent information can be effectively used for the analysis of such entangling measurements whose possible applications are discussed as well.Comment: 8 pages, 1 figure; accepted for publication in Phys. Rev.