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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 87 for “"mno"”.
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Fischer-Tropsch synthesis over SiO2, ZnO and MnO supported cobalt catalysts
… that are hard to reduce. Consequently ZnO and MnO were evaluated in comparison to Si02 as supports for cobalt supported Fischer-Tropsch catalysts. The aim of the study was to characterise the interaction between cobalt and the three supports (Si02, ZnO and MnO) in terms of the cobalt …
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First principles study of structure, defects and proton insertion in MnO₂
… in experiments at mid-reduction (groutellite, MnOOHo.5), may be due to lattice remaining coherent during intercalation.
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Structural, magnetic and electric transport properties of metal substituted La₀.₇Sr₀.₃MnO₃
… properties of substituted perovskites La₀.₇Sr₀.₃MnO₃ (LSMO), we studied th effects of replacing some of the Mn with Ti, Zr, and Cu atoms. The structural, magnetic and electrical phase transitions and transport properties of these compounds were investigated by neutron diffraction, magnetization, …
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Structural and magnetic properties of Ni and Cr substituted La₀.₇Sr₀.₃MnO₃
<p>"The <em>La₁₋ₓSrₓMn<sub>1-y</sub>B<sub>y</sub>O₃</em> perovskite systems where B represents a 3d transition metal such as Cr, Fe, Co, Ni, Cu, and Zn, are of significant interest due to their large magnetoresistance, and electronic transport properties that change significantly, depending on …
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Estabilidade térmica da coercividade e viscosidade magnética no nano compósito FeCo/MnO
… massivos. O sistema nanocomposito Fe40Co60=MnO produzido por mecano -síntese, e tratado termicamente (400oC) por diferentes tempos, foi o sistema investigado nesta dissertacção. Observou-se recentemente neste sistema o aumento da coercividade com a diminuição da temperatura e o surgimento do …
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Interplay between charge, spin and orbital ordering in La 1 - Kappa Sr Kappa MnO 3 manganites
… and spin ordering in lightly doped La1-xSrxMnO3 with x~1/8 has been studied using both resonant and non-resonant (high-energy) X-ray scattering (at Advance Photon Source at Argonne National Laboratory and HASY Lab at DESY) as well as neutron scattering (Research Reactor at Forschungszentrum …
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Interaction of Na, O₂, CO₂ and water on MnO(100): Modeling a complex mixed oxide system for thermochemical water splitting
… thought to be hydrogen evolution from a Na₂CO₃/MnO mixture, and oxygen evolution by thermal reduction of solids formed by Na⁺ extraction from NaMnO₂. Our work is aimed at understanding the fundamental chemical processes involved in the catalytic cycle, especially the hydrogen evolution from …
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Mechanistic understanding of biogenic Mn-oxide mediated bisphenol A degradation
… BPA is degraded by synthetic manganese oxides (MnO[subscript 2-syn]) without the requirement of oxygen. Manganese oxides (MnO₂) is a naturally occurring, strong oxidant, and its formation is mainly attributed to microbial Mn(II) oxidation in the environment. However, the reactivity of …
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Assessment of the fate of manganese in oxide-coated filtration systems
… the fate of manganese in manganese oxide (MnO<sub>x</sub>(s)) coated filter media. Specific objectives of the project included the following: 1. Determination of the effect of influent pH upon Mn(II) sorption and oxidation and upon the physical characteristics of the coating on the media. …
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Alkaline Potassium Polyacrylate Electrolytes for Rechargeable Zinc-Manganese Dioxide Batteries
<p>Zinc (Zn)–manganese dioxide (MnO<sub>2</sub>) rechargeable batteries have high specific theoretical capacity as well as being environmentally friendly, intrinsically safe and low-cost. Liquid electrolytes, such as potassium hydroxide (KOH), are historically used in these batteries; however, many …
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Investigating the Effect of Electrolyte Concentration and Charging Protocol on Materials Utilization in Rechargeable Zinc Manganese Dioxide Batteries
… cyclable, high energy density battery with MnO<sub>2</sub> cathodes encounters many obstacles. Chief among these is the inability of the widely-used γ-MnO<sub>2</sub> polymorph to retain its structural integrity when cycled to near full one-electron discharge capacity, which is about …
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The adsorption of Ni, Cu, Zn, Cd and Pb by δ-MnO₂ and its inclusion in an equilibrium model of metal partitioning in soils
… nickel, copper, zinc, cadmium and lead by δ-MnO₂ is investigated. This was done in order to provide thermodynamic data for an important adsorption phase in soils systems. Before this work, consistent adsorption data for only one adsorption phase, hydrous ferric oxide, were available. This …
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Electrochemical properties of crystalline polymorphs of MnO2 in aluminum and zinc metal batteries
… that employ low-cost and safe manganese dioxide (MnO<sub>2</sub>) as positive electrode materials (“cathodes”) are investigated using ionic liquid and aqueous electrolytes. Two crystalline polymorphs of MnO<sub>2</sub> are used: birnessite (δ-MnO<sub>2</sub>), a layered structure, and todorokite, …
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Virtual mobile networking using always best connected business relationships
… as a means to help Mobile Network Operators (MNOs) achieve meaningful market share in industry segments that have been harder, or more expensive, for the MNO to reach. In this way, MVNOs have remained niche providers to a highly segmented industry. In addition, a traditional 1:1 model of MVNO …
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Magnetic and structural properties of thin films and nanoparticles studied by scattering methods
… on the magnetic behavior, was investigated in MnO embedded in a porous glass. We studied the magnetic order and phase transition of MnO nanoparticles by polarized neutron scattering. The nanopores filled with MnO are wormlike structures with a typical diameter of 7nm. From the temperature …
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Étude par spectroscopie Raman des composés PrMnO[indice inférieur 3] et Pr[indice inférieur 0.5]Ca[indice inférieur 0.5]MnO[indice inférieur 3] monocristaux et couches minces
… diffusion Raman des monocristaux des composés PrMnO[indice]3 , Pr[indice]0.5 Ca[indice]0.5 MnO[indice]3 (PCMO) et des couches minces de Pr[indice]0.5 Ca[indice]0.5 MnO[indice]3 déposées sur SrTiO[indice]3 (STO) et LaAlO[indice]3 (LAO). Notre objectif global est d'établir le lien entre l'évolution …
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Tailoring Fluoride/Fluorine Bond Activity for High-Energy Li and Li-ion Batteries
… utilize lithium transition metal oxides, while MnO₂, SOCl₂, and SO₂ are representative examples for Li primary cathodes. In contrast, fluoride-based cathodes are generally less investigated, with only several instances, but all with exceedingly high theoretical energy densities, such as …
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Improving base metal electrowinning
<p>"In zinc electrowinning, Mn oxidizes to form MnO<sub>2</sub> on Pb-Ag anodes, cell walls and pipes. MnO<sub>2</sub> reduces anode corrosion but also leads to short circuits and maintenance issues. MnO<sub>2</sub> is thought to interact with chloride ions and produce oxidized chlorine species. …
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