The volume elements intercepted by intersecting cylinders

Call number: LD2668 .T4 1935 H3

An improved approach for flight readiness assessment

An improved methodology for quantitatively evaluating failure risk for a spaceflight system in order to assess flight readiness is presented. This methodology is of particular value when information relevant to failure prediction, including test experience and knowledge of parameters used in engineering analyses of failure phenomena, is limited. In this approach, engineering analysis models that characterize specific failure modes based on the physics and mechanics of the failure phenomena are used in a prescribed probabilistic structure to generate a failure probability distribution that is modified by test and flight experience in a Bayesian statistical procedure. The probabilistic structure and statistical methodology are generally applicable to any failure mode for which quantitative engineering analysis can be employed to characterize the failure phenomenon and are particularly well suited for use under the constraints on information availability that are typical of such spaceflight systems as the Space Shuttle and planetary spacecraft

Gasification of liquid sprays in an entrained flow gasifier

In an advancing technological world, gasification is a relatively mature technology that can be refreshed to help achieve sustainable energy production. This thesis discusses the development of a pressurized gasification system that converts bio-oil from fast pyrolysis of red oak into producer gas. Focus will be given to the challenges of operating a pressurized system at high temperature while injecting a non-uniform liquid. Demonstration experiments using methanol resulted in development of experimental methods to show critical nozzle designs and their affects on gasification of liquid jets. Start up of the bio-oil gasification system was performed using methanol as a model fuel. Methanol provides a stable platform for proving the system\u27s capabilities and focused attention on areas that needed design improvements. The ideal fuel also made it easy to compare the system results directly with theoretical calculations of equilibrium. The methanol experiments highlighted a need to show the importance of volatility verses the importance of atomization. Due to this discovery, the experiments where adjusted to demonstrate the change in atomization within a fixed system. Producing the whole bio-oil that 1) could be readily pumped 2) would not clog the system and 3) have congruent properties throughout testing proved to be a challenge within itself. A list of lab experiments were conducted to show differences in bio-oils that had been filtered to three difference sizes; 500μm, 90μm and 40μm. To best show the importance in atomization, the 90μm bio-oil was selected. The bio-oil gasification tests were performed using 3 nozzle configurations. Each nozzle showed a unique result while further proving that atomization is critical to performing gasification of liquid jets

The aesthetics of metamorphosis: Ovidian poetics in the works of Maria Luisa Bombal and Elena Garro.

The study begins with an analysis of the Ovidian concept of metamorphosis and its effects on the body, identity, and the corpus of the text. Chapter Two addresses the notion of "literary myth, " and contextualizes Bombal's and Garro's work within a tradition that allows the authors to reinscribe and transform myths (both Western and Mesoamerican) in their texts. Chapter Three locates Bombal's Impressionistic aesthetic within French Symbolist and Post-Symbolist poetics, and establishes Bombal as one of the first novelists to translate its aesthetic for Latin America. Chapter Four provides an explication of Bombal's La ultima niebla through the interpretation of the myths of Narcissus, Orpheus, and Pygmalion---myths that illustrate her protagonist's psychic transformation and reveal a deconstruction of discourses on romantic love through parody and irony. Chapter Five both contextualizes Elena Garro within the avant-garde that characterized post-Revolutionary Mexico, and scrutinizes Garro's critical response to the ideology of liberation. Chapter Six explores textual and temporal transformations in Garro's Los recuerdos del porvenir, a work that reinterprets both the Surrealist myth of a golden age and the Mesoamerican myths of cosmic periodicity. The conclusion argues that, through the intertextual aesthetics of metamorphosis, these authors exploit the ambivalence of language in order to subvert essential notions of feminine identity and convey the paradoxes of Otherness, gender, and limitation.Maria Luisa Bombal's La ultima niebla and Elena Garro's Los recuerdos del porvenir represent two models of the evolving tradition of literary myth. Their novels offer examples of enigmatic female characters whose negations of reality are aesthetically rendered as transformations that end in either figurative stasis or literal petrification. Bombal and Garro revise some of Ovid's most fascinating myths in order to draw attention to the aesthetic dimension of their own complex texts, as well as to address fundamental questions concerning feminine subjectivity

MSFC crack growth analysis computer program, version 2 (users manual)

An updated version of the George C. Marshall Space Flight Center Crack Growth Analysis Program is described. The updated computer program has significantly expanded capabilities over the original one. This increased capability includes an extensive expansion of the library of stress intensity factors, plotting capability, increased design iteration capability, and the capability of performing proof test logic analysis. The technical approaches used within the computer program are presented, and the input and output formats and options are described. Details of the stress intensity equations, example data, and example problems are presented