1,721,363 research outputs found
Estudio experimental en la inyección de vapor en un medio poroso saturado de aceite.
No full textTesis (Doctorado en Ciencias en Ingeniería Mecánica), Instituto Politécnico Nacional, SEPI, ESIME Zacatenco, 2017, 1 archivo PDF, (142 páginas). tesis.ipn.m
Estudio experimental en la inyección de vapor en un medio poroso saturado de aceite.
No full textTesis (Doctorado en Ciencias en Ingeniería Mecánica), Instituto Politécnico Nacional, SEPI, ESIME, Unidad Zacatenco, 2017, 1 archivo PDF, (142 páginas). tesis.ipn.m
Austin Papers: Series III, 1831-1834
No full textCopy of transcript for a letter from Fernando Rivera, discussing three men from Prussia who plan on opening a smithy, and noting their need for constantly running water
Structural health monitoring on a mooring chain using acoustic emission technique
No full textThe aim of this research project is to evaluate the feasibility of Acoustic Emission Technique for the crack growth monitoring on a mooring link. Moreover, this research work focus to do waves decomposition in a bar, bend bar and link to know how the bends in a link have an effect of wave conversion. Therefore, wave modes decomposition in frequency and time domain are done to know how the bends in a link could impact the wave propagation. In addition, AE technique is implemented in a test rig to monitor crack growth generated by Tension-Tension in a studless chain link of large diameter. In first part, a chain tensile test is carried out in artificial seawater using a single grade R5 link of diameter 160 mm, where different tensile loads were applied during almost a period of four months. The AE features are analysed to monitor crack growth, where selected peak amplitude filters are applied to plot the trends of the AE features. In second part, Pochhammer-Chree theory is used to know the dispersive curve and the wave modes in a straight rod. Then, the novel wave mode decomposition method was implemented to identify the wave with higher amplitude in a specific frequency range. Moreover, a study of wave modes decomposition was carried out in time domain in a cylindrical steel bar of small diameter (45 mm diameter). The work was carried out on simulation data and validated with experimental measurements. In last part, the wave decomposition is carried out in time domain for a bar, bend bar and link of large diameter (160 mm diameter). Comparison of wave mode decomposition between bar, bend bar and chain are obtained to know how the bends generate wave mode conversion. The wave decomposition is more complex for bar of large diameter because the number of excited waves increases. Therefore, a Hilbert transformation is applied to the axial component to get that the three components (radial, circumferential and axial) could be in phase to be able to obtain the wave decomposition. The simulations were validated against experimental work in straight bar and link, where good agreements of wave decomposition are obtained
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Avaliação do efeito do fator de transcrição E4BP4 no tecido adiposo marrom no contexto da obesidade
No full textO tecido adiposo marrom (brown adipose tissue, BAT) atua no combate à disfunção metabólica associada à obesidade por meio de mecanismos tanto termogênicos quanto não termogênicos. No entanto, evidências substanciais indicam que a obesidade afeta negativamente a morfologia mitocondrial e a capacidade oxidativa do BAT, comprometendo a homeostase energética sistêmica. Motivados por essa aparente contradição, investigamos a relação entre obesidade e dinâmica mitocondrial, uma vez que os mecanismos subjacentes permanecem incompletamente compreendidos. Neste trabalho, identificamos o E4BP4 como um repressor transcricional que previne a fragmentação mitocondrial e a disfunção oxidativa induzidas pela obesidade, por meio da inibição da síntese de ceramidas no tecido adiposo marrom
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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