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 20 of 1506 for “"Pt"”.
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Resistive switching in Pt/TiO 2 /Pt
… cells induced by the electroforming. On the assumption that a large number of oxygen vacancies are introduced by the electroforming process, the I-V behavior in electroformed switching cells was simulated with varying the distribution of oxygen vacancies in electroformed TiOx (x<2). The I-V …
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The Pt₈V ordering transformation in Pt 11 at. % V
The Pt₈V ordering transformation in Pt 11 qt.% V alloys has been studied. The study included determining the thermodynamic stability of Pt₈V, the kinetics of Pt₈V ordering transformation and the strengthening due to the presence of the ordered phase. Transmission electron microscopy, using election …
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Compuestos fotoluminiscentes de Pt(II) y Pt(II)-Pb(II): modulación de sus propiedades
Los complejos de PtII con ligandos ciclometalados que exhiben fotoluminiscencia están experimentando en las últimas décadas un creciente interés, debido al potencial que presentan en diversos dispositivos fotónicos tales como diodos emisores de luz, sensores, fotocatálisis o células fotovoltaicas. …
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Pt and Pt-Pd cluster interaction with graphene and TiO₂ based supports: A DFT study
… metal clusters. The clusters considered are a Pt₃₈ cluster and a bimetallic Pt₃₂Pd₆ alloy. The defects considered on graphene based supports are monovacancy defective graphene, OH and COOH functionalised graphene. The defects considered on TiO₂ based supports are a partially reduced TiO₂(110) …
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Sistemas de Pt(II) y Pt(IV) basados en cromóforos 2-arilbenzotiazol: propiedades ópticas y aplicaciones biológicas
… focuses on the synthesis and the study of the optical properties of organometallic luminescent platinum derivatives which incorporate substituted 2-arylbenzothiazole chromophores. It Is divided in a general Introduction, four separate Chapters and an Experimental section. The Pt(II) derivatives …
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Characterization of Pt/Al2O3 and Pt-Re/Al2O3 reforming catalysts and their evaluation using a naphtha feedstock, The
Includes bibliographical references.
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The AI-Pt-Ru ternary phase diagram
No abstract available.
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Hydrogen storage in pt/carbon nanotube sheets
… was evaluated using temperature-programmed desorption (TPD) measurement.
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The synthesis of novel Pt-based nanoparticles
… routes for the design and fabrication of V@Pt core-shell and bimetallic nanoparticles.
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Phase diagram for the co-adsorption of O and OH on Pt(100) and Pt(111) as determined by DFT
The Langmuir adsorption isotherm is often used to model molecular adsorption on catalyst surfaces. The model assumes that adsorption occurs on a homogenous energy surface at specific localized sites with no lateral interactions between adsorbents. This simplification causes some concerns when …
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Synthesis and Characterization of Pt-Ru-Sn Catalysts
<p>Magnesia-supported trimetallic Pt-Ru-Sn catalysts prepared through a cluster and a conventional synthetic route have been investigated in terms of their structural properties and their catalytic activity for the hydrogenation of citral and crotonaldehyde. FTIR results indicate that the majority …
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Residual stress in Pt coatings under thermal influence
… In this work, commercially manufactured Pt-Al₂O₃ composites annealed at 0°C, 300°C, 600°C and 1170°C above room temperature were investigated for residual stress using the non-destructive X-ray diffraction technique. The apparatus used for the investigation was a Ψ-goniometer with a …
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Mecânica quântica PT simétrica e a Hipótese de Riemann
Nesta monografia estudamos a formulação PT simétrica da mecânica quântica e o Hamiltoniano proposto em [1], cujos autovalores estão relacionados com os zeros da função zeta de Riemann, como proposto pela conjectura de Hilbert-Pólya
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Nanocrystalline Fe-Pt alloys: phase transformations, structure and magnetism
… and magnetic properties evolution in bulk Fe-Pt alloys composed of nanometer-sized grains. A comprehensive study of phase transformations and ordering in Fe-Pt alloys is performed by a combination of in-situ neutron powder diffraction and thermal analysis. The dependence of ordering processes …
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Machining induced defects in Relaxor ferroelectric PMN-PT crystals
… relaxor based piezoelectric single crystals (PMN-PT) render them as prime candidates for Navy sonar detectors as well as broad band medical ultrasonic imaging devices. Production of phased array probes utilizing these types of high performance ceramics requires dicing these crystals to arrays with …
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On the discrete nonlinear Schrödinger equation with PT-Symmetry
The purpose of this thesis is to develop the inverse scattering method for the nonlocal semi-discrete nonlinear Schrödinger equation (known as Ablowitz-Ladik equation) with parity-time symmetry proposed in Ablowitz and Musslimani’s paper. This includes the eigenfunctions (Jost solutions) of the …
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On Multi-component Nonlinear Schrödinger Equation with PT-Symmetry
… Schrödinger equation with parity- time (PT)-symmetry related to symmetric spaces. This includes: the spectral properties of the associated Lax operator, Jost solution, the scattering matrix, the minimal sets of scattering data and the fundamental analytic solutions. We also derive the …
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