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 244 for “"Orr"”.
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EXPLORATION OF TM-NX ORR ELECTROCATALYSTS FROM FIRST PRINCIPLE CALCULATIONS
… by the sluggish oxygen reduction reaction (ORR) at the cathode. An interesting alternative material set which continues to attract significant attention are TM-Nx (TM = Fe, Co, x = 2 - 4) based non-PGM electrocatalysts where the defect motifs are embedded in a carbon matrix during pyrolysis. …
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Symbolic, Cognitive, and Technological Dimensions of Orr Phase Oneota Ceramics
… of ceramic vessels and sherds from historic Orr phase occupations of the Upper Iowa and Riceford Creek localities of the La Crosse region are analyzed according to patterns of variability inherent in their manufacture, decoration, and use. In addition, because ethnoarchaeological research has …
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Toward Designing Active ORR Catalysts via Interpretable and Explainable Machine Learning
The electrochemical oxygen reduction reaction (ORR) is a very important catalytic process that is directly used in carbon-free energy systems like fuel cells. However, the lack of active, stable, and cost-effective ORR cathode materials has been a major impediment to the broad adoption of these …
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Cash management: applications and extensions of the Miller-Orr control limit approach.
Massachusetts Institute of Technology, Alfred P. Sloan School of Management. Thesis. 1972. M.S .
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Synthesis and Characterization of Bi-functional (ORR/OER) Nano-catalysts in Alkaline Media
… performance in the oxygen reduction reactions (ORR) and oxygen evolution reactions (OER) at the cathode and anode, respectively. All catalysts have been derived from transition metal oxides; an analysis of the synthesis and characterization has been conducted. The objectives are: (i) explore …
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ΣΥΜΒΟΛΗ ΕΙΣ ΤΗΝ ΘΕΡΑΠΕΙΑΝ ΤΗΣ ΠΡΟΠΤΩΣΕΩΣ ΤΟΥ ΟΡΘΟΥ ΔΙΑ ΤΡΟΠΟΠΟΙΗΣΕΩΣ ΤΗΣ ΜΕΘΟΔΟΥ ORR
… HOSPITAL OF PIRAEUS. WE USED A MODIFICATION OF ORR'S PROCEDURE. INSTEAD OF A STRIP OF FASCIA LATA (ORR'S PROCEDURE) WE USED A STRIP OF THE APONEUROSIS OF THE EXTERNAL OBLIQUE MUSCLE, WHICH WE FIXED ON THE ANTERIOR SURFACE OF THE MOBILISED RECTUM.
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De Novo Design and Stabilization of β-Sheet Peptides for Biomimicry of ORR Enzymes
… chemistry of the oxygen reduction reaction (ORR) and highlights how fungal laccases catalyze this transformation efficiently. It also outlines the synthetic strategy for solid phase peptide synthesis employed in the design and construction of peptide models for the purpose of emulating the …
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DFT insight into the oxygen reduction reaction (ORR) on the Pt₃Co(111) surface
… due to the slow oxygen reduction reaction (ORR) kinetics, high Pt loadings have to be used. The high Pt loadings lead to high costs of the PEMFC. Pt-Co alloys have been identified as catalysts having higher ORR activity higher than of a Pt-catalyst. Therefore, in the present study, the …
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Uniformly valid asymptotic solutions of the Orr-Sommerfeld equation and their application to plane Poiseuille flow
Thesis: M.S., Massachusetts Institute of Technology, Department of Mathematics, 1961
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From Orr to Zacharias and Beyond: An Approach Toward Christian Apologetics from the Purview of Worldview Truth-Testing
… the logical consistency of worldviews, the correspondence theory tests the empirical adequacy of a worldview, and the pragmatic theory tests the livability or of a worldview claim. Chapter 5 considers the four life questions (of origin, meaning, morality, and destiny) that give the context …
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The mobility of oxygen containing species (OCS*) over Pt-based catalyst surfaces: Impact on the oxygen reduction reaction (ORR) activity
… kinetics of the oxygen reduction reaction (ORR). To further enable wide-scale commercialisation of PEMFCs for automotive applications, major improvements in the ORR catalyst are therefore needed. An in depth understanding of the ORR mechanism over Pt surfaces can enable rational approaches …
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A DFT study of the interaction of Ox with Pt nanorod edge sites : a model for the ORR activity on Pt nanoparticle edges
… slow kinetics of the oxygen reduction reaction (ORR) over a platinum based electrode accounts for ca. 70% of the potential losses. As a result of the sluggish ORR kinetics, high platinum loadings are required. The high cost of platinum has made it crucial to improve the ORR activity and hence …
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A numerical investigation of the linear hydrodynamic stability of Newtonian and weakly non-Newtonian channel flows as described by the Orr-Sommerfeld equation
The Orr-Sommerfeld equation describes the growth of infinitesimal disturbances to laminar solutions of the Newtonaian Navier-Stokes equations. In this dissertation we consides in part idealised flows between two parallel planes of infinite extent and a finite distance apart. They are referred to as …
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Facilitating, understanding, and controlling the oxygen reduction reaction for fuel cell technology using (1) laccase-inspired tricopper molecular catalysts, (2) a high temperature and pressure reaction vessel, and (3) a hybrid bilayer membrane electrochemical platform
… major facets of the oxygen reduction reaction (ORR: O2 + 4 H+ + 4 e– → 2 H2O). First, I developed new tri-copper catalysts for the ORR with a specific focus on the active site present in multi-copper oxidases, which are the most active enzymes for the ORR. Second, I evaluated the ORR kinetics at …
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Electrocatalytic Oxygen and Nitrate Reduction Reactions Using Cu-Based Electrodes
… electrocatalysts. The oxygen reduction reaction (ORR) is important due to its application in the cathode of fuel cells. The nitrate reduction reaction (NRR) can be used to generate NH 3 as an alternative to the traditional Haber-Bosch process. The first part (chapter 1) of this thesis discusses …
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‘As native in my thought as any here’ A revisionist re-reading of the life and works of James Orr: poet, patriot and Ulster-Scot
The Ulster poet James Orr (1770-1816), from the Presbyterian, Scots-speaking County Antrim village of Ballycarry, experienced a brief period of fame during the 1800s when he published a volume of verse and became a regular contributor of poetry and essays to Belfast newspapers and journals. Orr, a …
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Design and fabrication of non-noble-metal electrocatalysts for oxygen reduction reactions.
… when the sluggish oxygen reduction reaction (ORR) occurs and much larger amount of Pt is employed, to bring down the over-all price of a fuel cell. With this aim, this Ph.D thesis has demonstrated the design and synthesis of a serial of high –performance Pt-free catalysts based on carbon …
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Synthetic Molecular Models for the Oxygen Reduction Active Sites in Heteroatom-Doped Graphitic Electrocatalysts: Linking Heterogeneous and Homogeneous Electrocatalysis
… catalysts for the oxygen reduction reaction (ORR) that are highly active, selective, and durable be created. To this point, the advancement of potential replacement catalysts such as metal- and nitrogen-doped carbon (M-N-C) materials has been hampered by a lack of detail regarding the …
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High oxygen permeation rates through poly(dimethyl siloxane) for fuel cells and oxygen reduction reaction mechanistic studies
… catalyzed oxygen reduction reaction (ORR) is essential to operation of most fuel cells and many types of batteries; oxygen, being prevalent in air, provides a costless, ambient, high-energy (1.23 V vs. normal hydrogen electrode) hole source to complete the electrochemical redox …
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