Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 18 of 18 for “"ECAP"”.
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Deposition of aluminum oxide by evaporative coating at atmospheric pressure (ECAP)
… of Evaporative Coating at Atmospheric Pressure (ECAP). This new idea is an atmospheric-pressure based process. By using the thermal energy of plasma, solid aluminum are evaporated and then produce a PVD-like alumina coating on a work piece. The aluminum rod is inserted in the center of the …
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The Panoramic ECAP Method: estimating patient-specific patterns of current spread and neural health in cochlear-implant users
… Electrically-Evoked Compound Action Potential (ECAP) is an objective measure of peripheral auditory neural responsiveness that can be measured in cochlear implant users. They are quick to record and are easy to do in the clinic as they require no additional hardware. They simply use the …
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Effect of incremental equal channel angular pressing (I-ECAP) on the microstructural characteristics and mechanical behaviour of commercially pure titanium
… SPD methods, equal channel angular pressing (ECAP) is the most widely used method for obtaining bulk UFG materials. However, ECAP (in its classical form) suffers from low productivity and is not a practical option for commercialization.;Therefore, lately the interest is in the development of …
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Improving mechanical properties of a magnesium alloy by severe plastic deformation
… by incremental equal channel angular pressing (I-ECAP). The goal of the process is to refine grain structure of a continuous bulk metallic billet without changing its dimensions. In the current work, the most popular wrought magnesium alloy AZ31B was subjected to I-ECAP for the first time to …
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Mechanical Behavior of Magnesium Experienced Severe Plastic Deformation
… extrusion and equal channel angular pressing (ECAP). Among these technologies, ECAP technology to process pure magnesium was studied. This thesis describes what ECAP technology is and reviews the current research status of ECAP processed pure magnesium.This thesis studied the effects of …
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Processing of aluminium and titanium alloys by severe plastic deformation
… properties. Equal-channel angular pressing (ECAP) and high pressure torsion (HPT) were considered as very important SPD techniques. Very high deformation is applied to the samples in ECAP and HPT which refines the grain size and enhances the properties of materials.<br/>In the present …
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Effects of high shear deformation from equal channel angular pressing-conform and post thermal mechanical processing on the microstructural and mechanical properties of titanium alloys
… to equal channel angular pressing-conform (ECAP-C) and post thermal mechanical processing (TMP). The ECAP-C process uses high-shear deformation to refine the microstructure with the goal of producing an ultrafine grain material with enhanced mechanical properties. Three titanium alloys were …
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Investigating Academic and Psychosocial Outcomes of First-Generation African American Postsecondary Students who completed Early College Access Programming: A Qualitative Case Study
… have completed early college access programming (ECAP). Not all children have equal access to higher education, therefore educators have been trying to bridge the gap in education for years. Due to socio-economic challenges in society, there has been a colossal increase in the need for diversity …
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Zyklische Plastizität von mikro- und submikrokristallinem Nickel
… submikrokristallinem Nickel, hergestellt durch ECAP und PED, untersucht. Zur Gefügecharakterisierung kamen verschiedene elektronenmikroskopische und röntgenographische Methoden zum Einsatz. Die Untersuchungen zur Gefügestabilität zeigten, dass (i) die Stabilität der Korn- und Substruktur bei der …
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BULK NANOSTRUCTURED STEELS FOR NUCLEAR REACTOR AND EXTREME ENVIRONMENT APPLICATIONS
… Therefore, equal channel angular pressing (ECAP), and high-pressure torsion (HPT) were used to produce bulk ultra-fine grained and nanocrystalline Kanthal-D [KD; Fe-21Cr-5Al-0.026C (wt.%) alloy] which resulted in an improvement in strength of up to 3 times their nominal strength from grain …
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Electro-anatomical models of the cochlear implant
… electrically-evoked compound action potential (ECAP) recorded from intracochlear electrodes. This thesis focuses on three aims. First, two patient-specific EAMs are formulated from hundreds of digital images of the histologically-sectioned temporal bones of two patients, attempting to …
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Studium mechanických vlastností a mikrostruktury jemnozrnných polykrystalů Cu a slitin Cu
… Cu-0,18hm%Zr, které byly připraveny metodou ECAP. Z tahových zkoušek bylo zjištěno, že charakteristická napětí 0,2 a max v deformovaném materiálu výrazně rostou s rostoucím stupněm deformace. Zlepšení mechanických vlastností je kompenzováno výrazným poklesem tažnosti v deformovaných vzorcích. …
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Condições sociosanitárias, padrão alimentar e perfil nutricional de crianças nos dois primeiros anos de vida, no município de Belo Horizonte – Minas Gerais
… Estudo de Consumo Alimentar Populacional - ECAP- BH , realizada no período de 2004 05, sendo apresentada na forma de dois artigos. No primeiro artigo, analisaram-se as condições de vida das crianças menores de dois anos de idade, relacionando-as com o seu estado nutricional e de saúde. Esses …
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Severe plastic deformation in highly immiscible copper alloys: self-organization
… such as equal channel angular pressing (ECAP), high pressure torsion (HPT), high energy ball milling (BM), accumulative roll bonding (ARB), are well known to refine the microstructures of metals and alloys into non-equilibrium states with nanometer-size grains, and they are gaining …
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The impact of first year mentoring experiences on the attrition rates of alternatively certified teachers.
… of the Education Career Alternatives Program (ECAP) were given the survey. Ninety-nine surveys were returned, of which 34 were not usable since these teachers were not being assigned a mentor teacher. Of the remaining 65 surveys, 54 were complete and usable surveys. The alternatively certified …
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Ultra-low-power circuits and systems for wearable and implantable medical devices
… nerve fiber model, and validated with in-vivo ECAP recordings in the auditory nerve of two cats and with psychophysical tests in two human cochlear implant users. Preliminary human subject testing shows that charge and energy savings of 20-30% and 15-35% respectively are possible with …
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Ermüdungs- und Rissfortschrittsverhalten ausscheidungshärtbarer ultrafeinkörniger Aluminiumlegierungen
Ultrafeinkörnige metallische Werkstoffe haben verstärkt wissenschaftliche Bedeutung erlangt. Um dieser neuartigen Werkstoffklasse über die grundlagenorientierte Forschung hinaus einen Einsatz in technischen Anwendungen zu ermöglichen, ist es notwendig, deren Verhalten unter verschiedenen …