2,298 research outputs found

    Interplanetary double-shock ensembles with anomalous electrical conductivity

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    Similarity theory is applied to the case of constant velocity, piston-driven, shock waves. This family of solutions, incorporating the interplanetary magnetic field for the case of infinite electric conductivity, represents one class of experimentally observed, flare-generated shock waves. This paper discusses the theoretical extension to flows with finite conductivity (presumably caused by unspecified modes of wave-particle interactions). Solutions, including reverse shocks, are found for a wide range of magnetic Reynolds numbers from one to infinity. Consideration of a zero and nonzero ambient flowing solar wind (together with removal of magnetic considerations) enables the recovery of earlier similarity solutions as well as numerical simulations. A limited comparison with observations suggests that flare energetics can be reasonably estimated once the shock velocity, ambient solar wind velocity and density, and ambient azimuthal Alfven Mach number are known

    Computational/experimental studies of isolated, single component droplet combustion

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    Isolated droplet combustion processes have been the subject of extensive experimental and theoretical investigations for nearly 40 years. The gross features of droplet burning are qualitatively embodied by simple theories and are relatively well understood. However, there remain significant aspects of droplet burning, particularly its dynamics, for which additional basic knowledge is needed for thorough interpretations and quantitative explanations of transient phenomena. Spherically-symmetric droplet combustion, which can only be approximated under conditions of both low Reynolds and Grashof numbers, represents the simplest geometrical configuration in which to study the coupled chemical/transport processes inherent within non-premixed flames. The research summarized here, concerns recent results on isolated, single component, droplet combustion under microgravity conditions, a program pursued jointly with F.A. Williams of the University of California, San Diego. The overall program involves developing and applying experimental methods to study the burning of isolated, single component droplets, in various atmospheres, primarily at atmospheric pressure and below, in both drop towers and aboard space-based platforms such as the Space Shuttle or Space Station. Both computational methods and asymptotic methods, the latter pursued mainly at UCSD, are used in developing the experimental test matrix, in analyzing results, and for extending theoretical understanding. Methanol, and the normal alkanes, n-heptane, and n-decane, have been selected as test fuels to study time-dependent droplet burning phenomena. The following sections summarizes the Princeton efforts on this program, describe work in progress, and briefly delineate future research directions

    Overview of STIP intervals 15-19

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    Five STIP Intervals for special scientific study of solar and interplanetary phenomena were designated between February 1984 and March 1986. The first two intervals were selected retrospectively after unusual periods of solar activity; the remaining three intervals were selected in advance in conjunction with anticipated spacecraft configurations and measurements. In this overview the historical background of these STIP Intervals and a summary of the rationale in the selection of these particular time periods for concentrated studies are presented

    Droplet combustion at reduced gravity

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    The current work involves theoretical analyses of the effects identified, experiments in the NASA Lewis drop towers performed in the middeck areas of the Space Shuttle. In addition, there is laboratory work associated with the design of the flight apparatus. Calculations have shown that some of the test-matrix data can be obtained in drop towers, and some are achievable only in the space experiments. The apparatus consists of a droplet dispensing device (syringes), a droplet positioning device (opposing, retractable, hollow needles), a droplet ignition device (two matched pairs of retractable spark electrodes), gas and liquid handling systems, a data acquisition system (mainly giving motion-picture records of the combustion in two orthogonal views, one with backlighting for droplet resolution), and associated electronics

    SLAPP-ed Around: Examining the Use of State Anti-SLAPP Laws in Federal Cases

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    This thesis explains Strategic Lawsuits Against Public Participation (SLAPPs) and examines the applicability of state anti-SLAPP laws in federal cases. Currently, the Federal Circuits are split on this issue, and the United States Supreme Court has not granted certiorari to any cases that have addressed this issue. This thesis reviews the jurisprudence related to the application of state anti-SLAPP laws in federal court. The author further examines what the Circuits have held about the applicability of anti-SLAPP laws and the rationales of each decision. Based on this information, this thesis argues that if the U.S. Supreme Court were to hear this issue, it should reject the applicability of the procedural portions of anti-SLAPP laws in federal court

    Mapping the Text of Lilith: MacDonald’s Labyrinths and Gardens

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    Guilty Until Proven Innocent: The Abuse of Pretrial Detention in America

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    Although few principles of law are as widely lauded and universally accepted as the presumption of innocence, this principle is violated daily by a practice that has become standard in our justice system, exceptional only in how unexceptional it seems. Pretrial detention—the practice of holding a defendant in custody before trial while he or she is still entitled to the presumption of innocence—is, in its current status, a clear contradiction of this principle and a staple of the American legal system

    Re-Embodying Our Discipline

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    This Master\u27s Thesis uses personal narrative and scholarly works to examine the benefits of embodiment in literary studies. Special attention is given to how lived experience can provide legitimate sources of academic evidence when examining texts and that texts can be used to integrate, examine, and reframe lived experiences
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