128 research outputs found
Global Fatigue Life Modelling of Steel Half-pipes Bolted Connections
No full textAbstractA steel hybrid structural solution for onshore wind turbine towers was proposed in the European project SHOWTIME. This solution is used in the lattice structure for the lower portion of the tower. Recently, a procedure for fatigue life estimation of steel half-pipes bolted connections applied in global structural models using multiaxial Smith-Watson-Topper (SWT) criteria was proposed by Öztürk et al. In this paper a procedure for design S-N curve modelling of steel half-pipes bolted connections is proposed. This procedure is based on a local approach using multiaxial fatigue criteria together with an elastoplastic analysis using the finite element method. The materials to be used in this analysis are the S355 and S690 steels. This evaluation to be performed is calibrated with experimental results of fatigue tests of the connection under consideration
Insurgent Testimonies: Witnessing Colonial Trauma in Modern and Anglophone Literature by Nicole M. Rizzuto
No full textIntervenciones afectivas al archivo materno en "La caja Topper" de Nicolás Gadano
No full textThrough the study of the autobiographical novel La caja Topper by Nicolás Gadano (2019), this article addresses the uses of the archive in the narratives of the children of victims ––in a broad sense–– of the last Argentine military dictatorship. Following the theoretical propositions of Jacques Derrida, Sara Ahmed, and Adriana Cavarero, we analyze the interventions that Gadano makes on the objects that his mother kept in a sneaker box as memorabilia of the family exile experience. First, we study the way in which the old box and the objects contained in it function as a matriarchive. Second, we analyze the operations that Gadano performs on the materiality, content, and ordering of the objects in the box, which produces a generational transfer of authority over the archive. Finally, we conclude that, through his fidelity to the maternal affective style, the author disassembles the traditional model of emotional labor division, reshaping the links between gender, generations, and memory.Com base no estudo do romance autobiográfico La caja Topper de Nicolás Gadano (2019), este artigo aborda os usos do arquivo nas narrativas dos filhos das vítimas da última ditadura militar argentina. Partindo das proposições teóricas de Jacques Derrida, Sara Ahmed e Adriana Cavarero, são analisadas as intervenções que, por meio da escrita do livro, Gadano faz sobre os objetos pertencentes à experiência familiar do exílio, que a mãe guardava em uma caixa de tênis. Em primeiro lugar, é estudado como a velha caixa e os objetos nela contidos funcionam como um matriarquivo. Em segundo lugar, são analisadas as operações que o livro realiza sobre a materialidade, o conteúdo e a ordenação dos objetos na caixa, para produzir uma transferência geracional da autoridade sobre o arquivo. Finalmente, conclui-se que, com sua fidelidade ao estilo afetivo materno, La caja Topperproduz uma desarticulação do modelo tradicional da divisão do trabalho emocional, que reconfigura os vínculos entre gênero, gerações e memória.A partir del estudio de la novela autobiográfica La caja Topper (2019) de Nicolás Gadano, este artículo aborda los usos del archivo en las narrativas de hijos de víctimas —en sentido amplio— de la última dictadura militar argentina. Desde las proposiciones teóricas de Jacques Derrida, Sara Ahmed y Adriana Cavarero se analizan las intervenciones realizadas por Gadano sobre los objetos pertenecientes a la experiencia familiar del exilio resguardados por la madre en una caja de zapatillas. En primer lugar, se estudia el modo en que la antigua caja y los objetos allí contenidos funcionan como un matriarchivo. En segundo lugar, se analizan las operaciones que Gadano realiza sobre la materialidad, el contenido y el ordenamiento de los objetos de la caja, para realizar un traspaso generacional de la autoridad sobre el archivo. Finalmente, se concluye que, con su fidelidad al estilo afectivo materno, el autor produce una desarticulación del modelo tradicional de la división del trabajo emocional, que reconfigura vínculos entre género, generaciones y memoria
Mean Stress Effect in Stress-Life for Hard Steels
No full textThe work in this thesis examines the effect of mean stress on the fatigue behaviour of very hard (Rockwell C 60) steels (AISI 8822, 8620, 9310, and cold-worked pre-stressing wire). In the mean stress tests, the minimum stress in the fatigue cycle was varied from test to test over a range from -1200 MPa to a value approaching the true fracture stress of each material. The results are not adequately explained by current theories for the effect of mean stress on fatigue behaviour in the region of compressive mean stresses. All current theories suggest that the maximum stress at the fatigue limit decreases with decreasing minimum stress. The results of this study shows that instead of continuing to decrease with decreasing minimum stress the maximum stress at the fatigue limit remains constant indicating an insensitivity to the minimum stress in the fatigue cycle for minimum stresses below the value in a fully reversed fatigue test. The theory proposed by the author corrects this error by maintaining the maximum stress at the fatigue limit constant with decreasing minimum stress in the region of negative mean stresses. The results are of interest to designers of components in which high negative residual stresses are introduced into materials hardened by, for example, carburizing, nitriding, or induction hardening to improve the fatigue strength of components. The present work allows considerably higher design stresses for operating stresses in the negative mean stress region than previous theories permit
Aerodynamic Shaping of a Propulsive Fuselage Concept: A Design Space Exploration
No full textBoundary layer ingestion is an airframe-propulsion integration technology capable of enhancing aircraft propulsive efficiency. The Propulsive Fuselage Concept, a tube-and-wing layout with an rear-fuselage-mounted propulsor in the boundary layer ingestion configuration, especially takes advantage this. However, the relation between physical shape and aerodynamic performance, resulting from the complex airframe-propulsor interaction, is not entirely understood. Also, contrary to long-haul aircraft, few studies have investigated the application of the concept on medium-haul aircraft with only 10% cruise thrust contribution coming from the boundary layer ingestion propulsor, which is a top-level requirement of the APPU project. To facilitate parametric studies regarding these research gaps, a parametric model is developed and implemented in an engineering design application that automates aerodynamic analysis to high degree. This thesis presents a methodology to numerically analyze axisymmetric propulsive fuselage concept designs; an engineering design application using the knowledge based engineering technology is presented that facilitates the implementation of complex engineering design rules in the construction of the parametric model. The application consist of three components. Firstly, a flexible geometric parameterization in 2D is developed that is proven capable of constructing well-performing designs. A translation mechanism is developed between these geometric input parameters and input parameters for class shape transformation curves, which form the mathematical basis for the geometry. Secondly, the construction of a C-shaped domain and a multi-block structured mesh are also automated in the application. The mesh density for this application was verified through a mesh convergence study, and can be adjusted to fit other mesh requirements through various mesh control capabilities. Lastly, the scripted interaction between the application and ANSYS Fluent software is automated. A fan modeling methodology was developed using boundary conditions that requires only fan pressure ratio as input, while mass flow continuity through the fan is ensured. The meshing and simulation routines are validated by comparing the results of the presented routine to that of a status-quo numerical simulation. All relevant aerodynamic output parameters show agreement in a range of 3.3%.The working of the engineering design application is demonstrated in a design space exploration based on the hypothesis that increased conicity of the rear fuselage and nacelle shape with respect to the longitudinal axis can reduce the required fan power in cruise conditions. To isolate the effect of conicity, a parameter sweep was conducted. Results show that with increasing conicity, the overall viscous dissipation was continuously reduced. Also the total pressure recovery at the fan inlet face increases up to a nacelle conical angle of 11 degrees, after which this decays due to increased wetted area. At 11 degrees conicity, the aerodynamic efficiency (defined as fan power required for a given net propulsive force) was increased by 0.81% relative to a less conical status-quo baseline design with 6 degrees conicity. The increased fuselage volume and wetted area due to increased conicity introduced the opportunity to shorten the fuselage without decreasing fuselage volume. This increased aerodynamic efficiency by 1.65% relative to the baseline. Also, as the intake diffusion functionality was redundant in this flow field, a third design was constructed with a 29% shorter intake duct, which increased aerodynamic efficiency by 1.81% compared to the baseline. Demonstrated by these unoptimized designs and the observed physical mechanisms, it is concluded that aerodynamic efficiency could benefit from the direct and indirect effects of an increase in conicity of the propulsive fuselage concept.APPU ProjectAerospace Engineerin
Ancestral Trauma, Animist Poetics: African Literature's Regenerative Death Drive
No full textIn this thesis I ask, what kind of trauma theory is immanent to modern African literature? Informed by psychoanalysis and deconstruction, I explicate from African texts a form of collective trauma that I term ancestral trauma and a regenerative logic of survival that I term animist poetics. Ancestral trauma names the process through which colonial modernity ruptures the cosmological frame of reference upon which the cultural memory of a colonized people depends. Desecrating the very form of intergenerational remembrance, ancestral trauma operates beyond the purveyance of memory studies. So does animist poetics. Rather than representing traumatic memory, animist poetics regenerates desecrated ancestral ties by paradoxically ritualizing their erasure. Animist poetics is thus an aesthetic logic immanent to modernity, which challenges dichotomies between African animism and Western modernity. Operating beyond the therapeutic framework of recovery and the Manichaeism of postcolonial critique, animist poetics reinvents precolonial cosmologies as responses to colonized modernity—not historic redemption, but collective survival. Authors such as Yvonne Vera and Wole Soyinka craft such a survival by aesthetically ritualizing death, which leads to a new theory of the death drive. Freud’s theory equates death with ontological stasis, but Vera and Soyinka posit an animist revision in which the deaths enforced by colonial and postcolonial regimes become transitions into new forms of collective life. This regenerative death drive at the heart of animist poetics both extends and overturns Freud’s most radical insight. Thus, in this thesis, through offering a postcolonial trauma theory, I ultimately gesture toward a post-secular theory of time in which the living, the dead, and the unborn can, in response to an erasure of the past, inherit the possibility of a future
UA12/2/1 Topper Extra - WKU Opens Sun Belt Play
No full textSpecial edition of the College Heights Herald featuring athletics. Claybourn, Cole. For WKU to Win, Kawaun Jakes Has to Step Up – Football Claybourn, Cole. WKU Marketing to Give Away Luke Bryan Tickets, Two $500 Shopping Sprees to Students Stephens, Brad. Tops Look to Start Fresh with Sun Belt Conference Opener – Football Stephens, Brad. Bowling Green Local Ryan Beard Making His Own WKU Legacy – Football Lanter, Austin. Lady Tops Home Again, Looking to Halt Losing Skid – Soccer Trent, Mercedes. Toppers Preparing for More Competitive meet – Track & Field Aulbach, Lucas. Quarterback Melanie Stutsman Running WKU’s Offense - Volleybal
UA12/2/1 Time Will Tell
No full textSpecial men\u27s basketball issue of the College Heights Herald. Hilltoppers 1998-99 Schedule Darr, John. Tops Await Answers to Many Questions Darr, John. Tops Try to Change Loser Image Darr, John. Tops a Toss-up In Sun Belt Conference Mayo, Travis. Coach Gets Advice from All Over – Dennis Felton Brewer, Jerry. Look for Leaner, Meaner Lee Lampley Mayo, Travis. Nashon McPherson Striving to Be This Year’s Best Team Player Mayo, Travis. No More Letdowns for Melvin Adams Clark, Ryan. Kyle Chapman Fulfills Topper Dream Clark, Ryan. Vince Edwards Wants to Start, Be Leader for Hilltoppers Sutton, Lyndsay. Energy Player is Needed – Karem Abdul-Jabbar Jr. Darr, John. Ravon Farris: Nothing Is Going to Hold Me Back Darr, Joh. Joe Harney A Quiet Leader Brewer, Jerry. Newcomer Making Mark – Shawn Langellier Darr, John. Rashon Brown Depending on Off-season Work Ethic for Success Hill, Chris. Ben Mauck Brings Post-play, Guard Skills to Hilltoppers Sutton, Lyndsay. Dr. Spock Hopes to Prosper During Year on Sidelines – Brian Allenspach Sisco, Scott. Despite Towering Height, Chris Marcus is New to Basketball Brewer, Jerry. Tremain Rowles a Versatile Freshman Hill, Chris. Being Topper a Dream for Casey Simpson Sisco, Scott. Derek Robinson Looking to Learn Syste
Acerca de algunas tradiciones orales de los amaziges del Alto Atlas marroquí.
No full text The author claims to have found still-alive traits of primitive byzantian christianism of the northern Africa in the folklore of Moroccan Imazighen, along with rests of even more ancient catastrophic myths.En el folklore de los amaziges marroquíes encuentra el autor huellas aún vivas de los ritos de un primitivo cristianismo bizantino del África del Norte, así como restos de mitos catastrofistas mucho más antiguos
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