Short take-off and landing (STOL) systems can offer significant capabilities to warfighters and, for civil operators thriving on maximizing efficiencies they can improve airspace use while containing noise within airport environments. In order to provide data for next generation systems, a wind tunnel test of an all-wing cruise efficient, short take-off and landing (CE STOL) configuration was conducted in the National Aeronautics and Space Administration (NASA) Langley Research Center (LaRC) 14-by 22-foot Subsonic Wind Tunnel. The test's purpose was to mature the aerodynamic aspects of an integrated powered lift system within an advanced mobility configuration capable of CE STOL. The full-span model made use of steady flap blowing and a lifting centerbody to achieve high lift coefficients. The test occurred during April through June of 2007 and included objectives for advancing the state-of-the-art of powered lift testing through gathering force and moment data, on-body pressure data, and off-body flow field measurements during automatically controlled blowing conditions. Data were obtained for variations in model configuration, angles of attack and sideslip, blowing coefficient, and height above ground. The database produced by this effort is being used to advance design techniques and computational tools for developing systems with integrated powered lift technologies.

The variations in carbon-13 nuclear magnetization with time have been determined for formic acid under proton-coupled and proton-decoupled conditions by the adiabatic rapid passage technique. The time-dependent variations for proton-coupled carbon-13 magnetization are nonexponential, while the nonequilibrium, proton-decoupled carbon-13 magnetization follows an exponential relationship. By applying the theoretical equations to the experimental results, spin–lattice relaxation times for the spin-decoupled case were calculated for both the formyl proton and carbon-13 nuclei as well as for the internuclear process. It is demonstrated that the carbon-13 relaxation process is dominated by the mutual relaxation of formyl protons and carbonyl carbons through the intramolecular dipole–dipole mechanism. Various means of extracting relaxation data with and without spin-decoupling equipment are discussed for the four-line two-spin system.

Methylethylene Nuclear Relaxation Times 2031 viously reported for this transition. A definitive placement of the 1La band in this crystal, however, will have to await a somewhat higher resolution and probably low-temperature study of the type reported here. Moreover, the location of the band in phenazine itself will have to rest on a more detailed study of the uncomplexed material than has been reported to date.11,15,19 Until such a study has been carried out, it is probably somewhat premature to speculate on the ordering of the 1Lb and 1La bands in phenazine on the basis of more-or-less qualitative observations of the crystal absorption of phenazine currently available.24 References and Notes(1) This work has been partially supported by a grant from the National Institutes of Health.

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