Materials Literature
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Nickel-titanium (NiTi) contains a unique set of properties which make it a desirable candidate for aeronautic applications. NiTi’s most useful characteristic comes from being a Shape Memory Alloy (SMA). With the proper thermo-mechanical training regimen, a NiTi tube can generate high stress as it rotates through large…
Abstract : Optical metamaterials are a class of engineered materials with a wide range of material properties and an equally wide range of anticipated applications. This research targets optical metamaterials in two ways. First, the dimensional constraints necessary to bring effective medium theory (EMT) into agreemen…
This paper presents a study of deformation and failure performances of a plastic sheet made of polymer alloys subjected to drop weight impact of a cylindrical mass with hemispherical tip at a certain velocity by using dynamic explicit finite element code of MSC. Dytran. An available material model in the finite elemen…
University of Minnesota Ph.D. dissertation. December 2012. Major: Electrical Engineering. Advisor: Stephen A. Campbell. 1 computer file (PDF); vii, 100 pages.
Opracowanie zawiera syntetyczną informację o stanie badań dotyczących rozwoju magnetycznych nieniszczących metod diagnozowania materiałów poddanych działaniu promieniowania neutronowego. We wstępie podane zostały podstawowe informacje o skutkach napromieniowania stali oraz o próbie Charpy’ego. Opisano cztery metody ma…
Most current energy requirements for electricity generation, industry and transportation are supplied from fossil fuels by thermal combustion processes, which generates emissions of gases containing light hydrocarbons such as methane, ethane and propane. Among them, methane is a major promoter of the greenhouse effect…
فلزات سنگین از نظر زیستی قابل تجزیه نیستند و بهدلیل تجمع در بافتهای زنده، سبب بروز اختلالات عصبی و سرطان میشوند. بنابراین حذف این عناصر از محیطهای آبی و پسابها از الزامات محیطزیستی و بهداشتی محسوب میگردد. در این تحقیق ابتدا مزوپور سیلیسی نانو متخلخل SBA-15 با روش هیدروترمال ساخته شد و سپس با قرار دادن گروههای آمی…
Abstract The photoluminescence of SiO2-Al2O3-LiO2-LaF3 oxyfluoride glass and glass ceramic samples doped with Ce3+, Eu2+ and Ce3+/Eu2+ is investigated, and the spectra and fluorescence intensities are compared. The luminescence of samples activated by Eu ions is found to be more intensive than of the samples doped wit…
The influence of compaction temperature on resistance under monotonic loading (Marshall) of Crumb-Rubber Modified (CRM) Hot-Mix Asphalt (HMA) was evaluated. The emphasis of this study was the application in Bogotá D.C. (Colombia). In this city the compaction temperature of HMA mixtures decreases, compared to the optim…
The nickel-titanium (Ni-Ti) alloys are used in the manufacture of orthodontic wires mainly due to its greater resilience and low modulus of elasticity when\ncompared to other alloys, particularly stainless steel. The aim of this study was to compare the mechanical properties of shape memory alloys wires in three-point…
Se estudiaron las propiedades estructurales, vibracionales y eléctricas de películas V2O5·nH2O y PEG0.2/V2O5 en función del tiempo de gelificación. Las películas fueron sinterizadas por sol-gel mediante la ruta del pentóxido de vanadio sobre sustratos de vidrio previamente tratados. La caracterización se llevo a cabo…
Se obtuvieron aleaciones austeníticas del sistema Fe-Mn-Al, en el intervalo Fe-(4,9~11,0 wt% de Al)-(17,49~34,3 wt% de Mn)-(0,43~1,25 wt% de C), las cuales fueron fundidas en un horno de inducción a partir de materiales de alta pureza. Las aleaciones se evaluaron con respecto a fenómenos de corrosión, erosión en medio…
The following research thesis focuses on methods of controlling nitrogen oxides (NO\(_X\)) and particulate matter (PM) emissions emitted from a low temperature diesel exhaust. This involves studying the influence of hydrogen (H\(_2)\) on various aftertreatment devices such as hydrocarbon selective catalytic reduction…
In this paper, PZT film has been deposited on Ti substrate by using a hydrothermal method. The hydrothermal reaction solution was stirred by 2 types of methods. One mixing method was a rotation mixing method and the other was an ultrasonic vibration mixing method. Bimorph actuators were fabricated and evaluated with d…
Flexible composite propellers are subject to large deformation under heavy loading, and hence the hydrodynamic performance of deformed propeller might deviate from that of the metallic propeller under negligible deformation. To design the flexible propeller, it is therefore necessary to be able to evaluate the structu…
"Los recubrimientos de carburo de cromo sobre acero son un buen candidato para aplicaciones de conformado y moldes de inyección. La alta resistencia mecánica, resistencia química y estabilidad a alta temperatura de la fase Cr3C2 pueden ser compatibles con el intenso desgaste abrasivo y la corrosión en tales operacione…
Honors (Bachelor's)
El volumen de investigacion en los metamateriales ha crecido de forma vertiginosa durante los ultimos anos. La respuesta electromagnetica de estos materiales presenta unas caracteristicas inusuales que no se encuentran en materiales de la naturaleza. Por lo tanto, se deben construir de forma artificial y se encuadran…
Silica nanoparticles were modified with titanium tetraisopropoxide (TTIP) via atwo-step sol-gel route. The modified silica nanoparticles were characterized using FTIR spectroscopy, thermal gravimetric analysis (TGA) and EDAX elemental analysis. Photocatalytic activity of the modified nanocomposites was evaluated by ph…
\n\t\t\t\t\tThis research study has developed new ways to control bulk properties of self-assembled microemulsions and lyotropic liquid crystals (LLCs) by manipulations of their corresponding precursor phase behaviour. Investigation into relating phase behaviour with the morphology, porosity, thermal stability, rheolo…