Sensitivity analysis of the space shuttle to ascent wind profiles

A parametric sensitivity analysis of the space shuttle ascent flight to the wind profile is presented. Engineering systems parameters are obtained by flight simulations using wind profile models and samples of detailed (Jimsphere) wind profile measurements. The wind models used are the synthetic vector wind model, with and without the design gust, and a model of the vector wind change with respect to time. From these comparison analyses an insight is gained on the contribution of winds to ascent subsystems flight parameters

Strapdown calibration and alignment study. Volume 3 - Laboratory procedures manual

Techniques for laboratory calibration and alignment of strapdown inertial sensing unit - procedures manua

Multifluid, Magnetohydrodynamic Shock Waves with Grain Dynamics II. Dust and the Critical Speed for C Shocks

This is the second in a series of papers on the effects of dust on multifluid, MHD shock waves in weakly ionized molecular gas. We investigate the influence of dust on the critical shock speed, v_crit, above which C shocks cease to exist. Chernoff showed that v_crit cannot exceed the grain magnetosound speed, v_gms, if dust grains are dynamically well coupled to the magnetic field. We present numerical simulations of steady shocks where the grains may be well- or poorly coupled to the field. We use a time-dependent, multifluid MHD code that models the plasma as a system of interacting fluids: neutral particles, ions, electrons, and various ``dust fluids'' comprised of grains with different sizes and charges. Our simulations include grain inertia and grain charge fluctuations but to highlight the essential physics we assume adiabatic flow, single-size grains, and neglect the effects of chemistry. We show that the existence of a phase speed v_phi does not necessarily mean that C shocks will form for all shock speeds v_s less than v_phi. When the grains are weakly coupled to the field, steady, adiabatic shocks resemble shocks with no dust: the transition to J type flow occurs at v_crit = 2.76 v_nA, where v_nA is the neutral Alfven speed, and steady shocks with v_s > 2.76 v_nA are J shocks with magnetic precursors in the ion-electron fluid. When the grains are strongly coupled to the field, v_crit = min(2.76 v_nA, v_gms). Shocks with v_crit < v_s < v_gms have magnetic precursors in the ion-electron-dust fluid. Shocks with v_s > v_gms have no magnetic precursor in any fluid. We present time-dependent calculations to study the formation of steady multifluid shocks. The dynamics differ qualitatively depending on whether or not the grains and field are well coupled.Comment: 43 pages with 17 figures, aastex, accepted by The Astrophysical Journa

Only Where Justified: Toward Limits and Explanatory Requirements for Nationwide Injunctions

In Part I of this Article, I discuss the existing law and current debates surrounding nationwide injunctions. I consider the origins of both the apparent recent surge in the issuance of nationwide injunctions and the apparent recent surge in skepticism concerning nationwide injunctions. In Part II, I analyze the potential justification for issuance of a nationwide injunction that I find most compelling, and on which basis I argue a court is well within the bounds of Article III notwithstanding the indirect benefits of such injunction to nonparties. In Part III, I consider three other sometimesasserted justifications that I argue courts should rule are insufficient reasons to grant nationwide injunctions, whether on Article III grounds or simply as a prudential matter. In Part IV, I analyze two problems with nationwide injunctions that I find particularly problematic. I argue that these problems, in combination with numerous other disadvantages of nationwide injunctions noted by other commentators, should move courts to attempt reforms aimed at limiting the circumstances under which nationwide injunctions may be issued. In Part V, I discuss potential reform ideas. I conclude that both substantive limits and certain procedural requirements would help limit the issuance of nationwide injunctions to cases in which they are truly justified