1,720,970 research outputs found
Interfacial mechanical analysis of matrix fibres for a coated glass fabric
No full textA base fabric of PTFE coated glass of great strength and coated on both sides by polytetrafluoroethylene (PTFE) was analyzed. Interfacial strains between the matrix fibers were measured using electronic interferometric holography. The displacements in two orthogonal directions were measured using a two-beam interferometer. The final output was provided by the Holo-Moiré Strain Analyzer (HMSA) giving the principal strains and their directions in the region of observation. The optical method was validated using the strain gauges
Mechanical properties determination of a ptfe glass fabric using an optical non contact tecnique
No full textNew equations for slopes measurement by reflection Moirè technique
No full textA numerical computation of a very advanced experimental method to acquire shapes is introduced in this paper. The basic equations that relate the measurement of slopes to the basic geometric and optical parameters of the system are derived. The sensitivity and accuracy of the method are discussed. In order to validate the accuracy and the applicability of this method, the qualitative slope behavior of a loaded metallic layer is given
Experiencing modal data on quality controls for structural components in the automobile industry
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Stress analysis of weldments by holographic moire and the finite element method
No full textThe research work presented in this paper deals with the determination of the stress concentration at the root of the fillet of a weldment on a T steel specimen. A finite element model was developed for the specimen. Measurements were carried out using the holographic moire technique. Strain gages were added to evaluate extrapolation techniques proposed in the literature. Good agreement was found between the finite element results and the optically measured values. The strain gage extrapolation technique yielded very low values
Finite Element Study on Stability in the Femoral Neck and Head Connection to Varying Geometric Parameters with the Relates Implications on the Effect of Wear
No full textTotal hip arthroplasty (THA) is a common surgical procedure used to treat hip osteoarthritis and other joint conditions that cause pain and functional limitation. Traditionally, THA has been performed most often in elderly patients, but in recent years, there has been an increase in hip arthroplasties in young patients. Femoral prosthesis rupture is a rare but significant complication that can also occur in young patients undergoing total hip arthroplasty (THA). Some of the factors that can contribute to femoral prosthesis ruptures include abnormal overload, defects in the design, lack of geometric fit, and type of materials used in the stem and femoral head connection. The aim of this study is to analyze the criticalities in the contact between the femoral head and the stem neck. In particular, two types of contacts will be taken into consideration: proximal and distal, and through the finite element method (FEA), the criticalities will be defined. The results show that in the proximal contact, the stress levels exceeded 500 MPa in certain areas of the prosthesis. This stress could potentially lead to structural failure, such as rupture or deformation of the prosthesis. In addition, to prevent bacterial infiltration or debris from the outside, the distal connection is recommended
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Variations on the Author
Full text link“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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