3,773 research outputs found

    Deactivation of N2A 3 Sigma u plus molecules in the aurora

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    Analysis of N2A 3 Sigma u positive molecule deactivation in auroras using atmospheric model based on mass spectrometer measurement

    Specification for a Program for an Interative Aeroelastic Solution (PIAS)

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    An engineering and software specification which was written for a computer program to calculate aeroelastic structural loads including the effects of nonlinear aerodynamics is presented. The procedure used in the program for an iterative aeroelastic solution (PIAS) is to alternately execute two computer codes: one to calculate aerodynamic loads for a specific wing shape, and another to calculate the deflected shape caused by this loading. A significant advantage to the design of PIAS is that the initial aerodynamic module can be replaced with others. The leading edge vortex (LEV) program is used as the aerodynamic module in PIAS. This provides the capability to calculate aeroelastic loads, including the effects of a separation induced leading edge vortex. The finite element method available in ATLAS Integrated structural analysis and design system is used to determine the deflected wing shape for the applied aerodynamics and inertia loads. The data management capabilities in ATLAS are used by the execution control monitor (ECM) of PIAS to control the solution process

    Rocket investigation of the auroral green line

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    Dissociative excitation and recombination reactions of atomic oxygen by auroral electrons, related to auroral green lin

    A mass spectrometer observation of NO in an auroral arc

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    NO measurement in auroral arc by mass spectrometer onboard Aerobee rocke

    Ion composition and ion chemistry in an aurora

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    Auroral ion distribution and conversion of oxygen protons to nitric oxide proton

    Oligomer formation within secondary organic aerosols: equilibrium and dynamic considerations

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    We present a model based on the volatility basis set to consider the potential influence of oligomer content on volatility driven secondary organic aerosol (SOA) yields. The implications for aerosol evaporation studies, including dilution, chamber thermo-equilibration, and thermodenuder studies, are also considered. A simplified description of oligomer formation reproduces essentially all of the broad classes of equilibrium and dynamical observations related to SOA formation and evaporation: significant oligomer content may be consistent with mass yields that increase with organic aerosol mass concentration; reversible oligomerization can explain the hysteresis between the rate of SOA formation and its evaporation rate upon dilution; and the model is consistent with both chamber thermo-equilibration studies and thermodenuder studies of SOA evaporation
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