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Investigation Of Titanium Nitride As Catalyst Support Material And Development Of Durable Electrocatalysts For Proton Exchange Membrane Fuel Cells, Bharat Avasarala
Investigation Of Titanium Nitride As Catalyst Support Material And Development Of Durable Electrocatalysts For Proton Exchange Membrane Fuel Cells, Bharat Avasarala
Legacy Theses & Dissertations (2009 - 2024)
The impending energy and climatic crisis makes it imperative for human society to seek non-fossil based alternative sources for our energy needs. Although many alternative energy technologies are currently being developed, fuel cell technology provides energy solutions, which satisfy a wide range of applications. But the current fuel cell technology is far from its target of large scale commercialization mainly because of its high cost and poor durability. Considerable work has been done in reducing the cost but its durability still needs significant improvement. Of the various materials in a PEM fuel cell, the degradation of electrocatalyst affects its durability …
Projective Spectrum And Cyclic Cohomology, Patrick Gene Cade
Projective Spectrum And Cyclic Cohomology, Patrick Gene Cade
Legacy Theses & Dissertations (2009 - 2024)
For a tuple A=(A_1,A_2,...,A_n) of elements in a unital topological algebra, B, over complex numbers the projective spectrum, P(A) is the set of z such that the linear pencil A(z)=z_1A_1+z_2A_2+ ... + z_nA_n is not invertible in B.
Tropical-Extratropical Interactions And Arctic-Extratropical Interactions Conducive To Intraseasonal Variability Of The North Pacific Jet Stream, Jason Michael Cordeira
Tropical-Extratropical Interactions And Arctic-Extratropical Interactions Conducive To Intraseasonal Variability Of The North Pacific Jet Stream, Jason Michael Cordeira
Legacy Theses & Dissertations (2009 - 2024)
The autumnal spin up of the Northern Hemisphere (NH) general circulation is characterized by intraseasonal variability in the structure of the North Pacific jet stream (NPJ). The variability in the structure of the NPJ is often associated with large-scale flow reconfigurations over the North Pacific and North America and changes in the NH zonal available potential energy (AZ). This dissertation investigates variability in the structure of the NPJ and the NH AZ in conjunction with tropical-extratropical interactions (TEIs) and arctic-extratropical interactions (AEIs). The former are investigated in association with the El Niño-Southern Oscillation, the Madden-Julian Oscillation, and western North Pacific …
Significance Of Hno3 Acid Photolysis On Surfaces In Tropospheric Chemistry, Honglian Gao
Significance Of Hno3 Acid Photolysis On Surfaces In Tropospheric Chemistry, Honglian Gao
Legacy Theses & Dissertations (2009 - 2024)
The reactive nitrogen trace gases (NOy) including nitrogen oxides (NOx) and their secondary products are known to cause ground-level ozone pollution, photochemical smog, acid deposition, and overall air quality degradation. NOx was believed to be permanently removed from the atmospheric by HNO3 formation and deposition. However, our laboratory experimental results show that HNO3 can be remobilized back to photochemically labile HONO and NOx (re-NOx-ification). We have verified and quantified HONO and NOx production from the photolysis of HNO3 on various surfaces, including Pyrex, leaves of plants, and other environmentally relevant …
New Photoluminescent Copper(I) Complexes : Impact Of Bridging Carboxylates On Solid-State Structures And Photophysical Properties, Oleksandr Hietsoi
New Photoluminescent Copper(I) Complexes : Impact Of Bridging Carboxylates On Solid-State Structures And Photophysical Properties, Oleksandr Hietsoi
Legacy Theses & Dissertations (2009 - 2024)
Polynuclear copper(I) carboxylates exhibiting rich luminescent properties and a remarkable structural diversity have been the main focus of this investigation. In spite of the well-developed methods of copper(I) carboxylates synthesis, only a handful of complexes have been crystallographically characterized prior to our work. Notably, they all demonstrate different structural arrangements in the solid state. This dissertation describes the work that has been carried out towards the synthesis of new copper(I) carboxylates, the study of their molecular and solid-state structures, and their solid-state photoluminescent (PL) properties. In this work, we have prepared a series of new copper(I) carboxylates of the general …
Generalized Galilean Transformations And The Measurement Problem In The Entropic Dynamics Approach To Quantum Theory, David Terence Johnson
Generalized Galilean Transformations And The Measurement Problem In The Entropic Dynamics Approach To Quantum Theory, David Terence Johnson
Legacy Theses & Dissertations (2009 - 2024)
Quantum mechanics is an extremely successful and accurate physical theory, yet since its inception, it has been afflicted with numerous conceptual difficulties. The primary subject of this thesis is the theory of entropic quantum dynamics (EQD), which seeks to avoid these conceptual problems by interpreting quantum theory from an informational perspective.
Electron-Phonon Interactions And Quantum Confinement Effects On Optical Transitions In Nanoscale Silicon Films, Vimal Kumar Kamineni
Electron-Phonon Interactions And Quantum Confinement Effects On Optical Transitions In Nanoscale Silicon Films, Vimal Kumar Kamineni
Legacy Theses & Dissertations (2009 - 2024)
Theoretical studies have attributed the temperature dependence of the linear optical response (dielectric function) of bulk semiconductors to electron-phonon interactions and thermal expansion of the lattice. However, the role of phonons in the optical properties of nanoscale structures is often overlooked. This thesis systematically investigates the impact of both carrier confinement and electron-phonon interactions using nanoscale films of silicon in crystalline silicon quantum wells (c-Si QW). Spectroscopic ellipsometry (SE) is a linear optical technique used to of extract the dielectric function and thickness of very thin films. X-ray reflectivity (XRR) was used as the complementary thickness metrology method. The dielectric …
Nucleation, Wetting And Agglomeration Of Copper And Copper-Alloy Thin Films On Metal Liner Surfaces, Stephanie Florence Labarbera
Nucleation, Wetting And Agglomeration Of Copper And Copper-Alloy Thin Films On Metal Liner Surfaces, Stephanie Florence Labarbera
Legacy Theses & Dissertations (2009 - 2024)
One of the key challenges in fabricating narrower and higher aspect ratio interconnects using damascene technology has been achieving an ultra-thin (~2 nm) and continuous Cu seed coverage on trench sidewalls. The thin seed is prone to agglomeration because of poor Cu wetting on the Ta liner. Using in-situ conductance measurements, the effect of lowering the substrate temperature during Cu seed deposition has been studied on tantalum (Ta) and ruthenium (Ru) liner surfaces. On a Ta surface, it was found that lowering the deposition temperature to -65°C increases the nucleation rate of the Cu thin film, and reduces the minimum …
Western Equatorial Pacific Climate Variability From Restricted Basins : Century Scale Changes In Kau Bay To Glacial-Interglacial Changes In The Sulu Sea, Samantha Langton
Western Equatorial Pacific Climate Variability From Restricted Basins : Century Scale Changes In Kau Bay To Glacial-Interglacial Changes In The Sulu Sea, Samantha Langton
Legacy Theses & Dissertations (2009 - 2024)
The surface ocean in the western equatorial Pacific contains some of the warmest water on the planet in the western Pacific warm pool (WPWP). Changes in the size and scope of the warm pool have a significant impact on global climate. With the concern of changes in the extent of this body of water as a result of anthropomorphic changes in atmospheric composition, it is vital to investigate prior changes to the WPWP, the causes of such changes, and resultant effects. For my dissertation, I used several proxies to analyze sediments from Kau Bay and the Sulu Sea in Indonesia …
Optimization And Development Of Silicon-Based Semiconductor Devices Using Tcad, Changwoo Lee
Optimization And Development Of Silicon-Based Semiconductor Devices Using Tcad, Changwoo Lee
Legacy Theses & Dissertations (2009 - 2024)
Computer simulation of the electrical and optical properties of semiconductor devices has been became as an essential tool for developing new device as well as for improving existing device. This presentation describes applications of physical device simulation: (1) design optimization of power MOSFET, which is single crystalline based silicon semiconductor device, for cryogenic temperature application and (2) two-dimensional device simulation of amorphous silicon based solar cell to develop novel photovoltaic device with high efficiency.
Albany Particle Training And Testing Tower (Apt3) : A Remote Interactive Lab, Hasan Mahmood
Albany Particle Training And Testing Tower (Apt3) : A Remote Interactive Lab, Hasan Mahmood
Legacy Theses & Dissertations (2009 - 2024)
We have built a prototype time-of-flight system named Albany Particle Testing and Training Tower (APT3) based on scintillation counters (Lucite or Poly-methyl methacrylate (PMMA)) with dimensions (50 × 8 × 5 cm3). The CAMAC based data acquisition (DAQ) system and control setup to collect and process information from a scintillation detector using LabVIEW (v.8.5) has been developed. We have also studied the timing resolution of APT3 setup as a function of the hit position of the particle beam (cosmic muons) from the scintillation counter and as a function of the high voltage applied to the scintillation counter. After locating the …
Autonomous Entropy-Based Intelligent Experimental Design, Nabin Kumar Malakar
Autonomous Entropy-Based Intelligent Experimental Design, Nabin Kumar Malakar
Legacy Theses & Dissertations (2009 - 2024)
The aim of this thesis is to explore the application of probability and information theory in experimental design, and to do so in a way that combines what we know about inference and inquiry in a comprehensive and consistent manner.
In-Cell And In Vitro Studies Of Disease Related Protein-Protein Interactions Using Nmr-Spectroscopy, Andres Yudiel Maldonado
In-Cell And In Vitro Studies Of Disease Related Protein-Protein Interactions Using Nmr-Spectroscopy, Andres Yudiel Maldonado
Legacy Theses & Dissertations (2009 - 2024)
The receptor for advanced glycation end products (RAGE) is a multiligand cell surface macromolecule that plays a central role in the etiology of diabetes, inflammation, and neurodegeneration. The cytoplasmic domain of RAGE, ctRAGE, is critical for RAGE-dependent signal transduction. As the most membrane proximal event, mDia1 binds to ctRAGE and is essential for RAGE ligand-stimulated phosphorylation of AKT and cell proliferation/migration. We show that ctRAGE contains an unusual alpha-turn that mediates the mDia1-ctRAGE interaction and is required for RAGE dependent signaling. The results establish a novel mechanism through which an extracellular signal initiated by RAGE ligands regulates RAGE signaling in …
Origin And Maintenance Of The Stable Boundary Layer In A Patchy Landscape, Luiz Eduardo Medeiros
Origin And Maintenance Of The Stable Boundary Layer In A Patchy Landscape, Luiz Eduardo Medeiros
Legacy Theses & Dissertations (2009 - 2024)
Field observations made in Hudson Valley region, NY during the Hudson Valley Ambient Meteorology Study (HVAMS) are analyzed to examine how terrain and land cover influence nocturnal mixing in real-world landscapes. Important terrain features such as local topographic concavity and site sheltering are shown to exhibit systematic influence on turbulent intermittency and on the consequent nocturnal heat and momentum fluxes. Very local obstacles have their most important effects on mixing during strong winds (> 5m/s). Local terrain concavity was found to be the more important factor influencing surface fluxes than sheltering for all classes of winds.
Persistence And Dissipation Of Lake Michigan-Crossing Mesoscale Convective Systems, Nicholas Metz
Persistence And Dissipation Of Lake Michigan-Crossing Mesoscale Convective Systems, Nicholas Metz
Legacy Theses & Dissertations (2009 - 2024)
This thesis investigates mature mesoscale convective systems (MCSs) that traversed Lake Michigan to elucidate synoptic-scale and Lake Michigan-related features that discriminate between persistence and dissipation. Of the 110 coherent MCSs that crossed Lake Michigan during the warm seasons (April–September) of 2002–2007, 47 (43%) persisted, while 63 (57%) dissipated. Persistence was favored during July and August, when Lake Michigan was warmer and during the evening and overnight, when the low-level jet (LLJ) was most intense. However, a number of MCSs also persisted during the early warm season when the Lake Michigan water temperature was cooler than the surrounding land.
On Lower Bounds Of The Chung-Diaconis-Graham Random Process, Richard Eugene Neville
On Lower Bounds Of The Chung-Diaconis-Graham Random Process, Richard Eugene Neville
Legacy Theses & Dissertations (2009 - 2024)
Chung, Diaconis, and Graham considered random processes of the form X_(n+1)=(a_n)X_n+b_n (mod p) where p is odd, X_0=0, b_n are i.i.d. for n=0,1,2,... with P(b_n=0)=P(b_n=1)=P(b_n=-1)=1/3, and a_n=2 always. Later, Hildebrand was able to establish a lower bound for this process as p approaches infinity. This paper will prove the following conclusions on lower bounds of the Chung-Diaconis-Graham random process:
Lattice Vertex Algebras And Combinatorial Bases, Michael Eugene Leslie Penn
Lattice Vertex Algebras And Combinatorial Bases, Michael Eugene Leslie Penn
Legacy Theses & Dissertations (2009 - 2024)
We explore the structure of a certain ``principal'' subalgebra, $W_L(\mathcal{B})$, of a lattice vertex (super)-algebra, $V_L$, where $L$ is a non-degenerate integral lattice, and $\mathcal{B}$ is a $\mathbb{Z}$-basis of $L$. Under a certain positivity condition on $\mathcal{B}$ we find a presentation of $W_L(\mathcal{B})$ and of $W_L(\mathcal{B})$-modules. In a more general case we also find their combinatorial bases. For both cases we calculate the (multi)-graded dimensions of modules expressed as fermionic $q$-series . This work generalizes some of the results from \cite{CalLM}, which involved a root lattice of type $A-D-E$, and where $\mathcal{B}$ was the set of simple roots.
Distributed Replica Placement With Network Coordinates, Fan Ping
Distributed Replica Placement With Network Coordinates, Fan Ping
Legacy Theses & Dissertations (2009 - 2024)
Recent years have witnessed a proliferation of large scale distributed systems that manage massive amounts of data at diverse geographic locations. In such systems, the overall system performance can be significantly affected by the round-trip time between computing nodes. Thus, efficiently and accurately measuring or estimating network latency is a key requirement.
Structural Interactions And Dynamics Of Disease Related Proteins By Using Nmr Spectroscopy, Shadakshara Swamy Puttamadappa
Structural Interactions And Dynamics Of Disease Related Proteins By Using Nmr Spectroscopy, Shadakshara Swamy Puttamadappa
Legacy Theses & Dissertations (2009 - 2024)
Nuclear Magnetic Resonance (NMR) is a powerful spectroscopic technique to study the structure, molecular interactions, and dynamics of proteins. Modern NMR instrumentation, advancements in experimental techniques and revolutionary developments in recombinant DNA technology have made NMR a versatile and very convenient tool for biomolecule characterization.
Biogeographic Consequences Of Historic And Contemporary Climate Change In Boreal Forest Birds, Joel Ralston
Biogeographic Consequences Of Historic And Contemporary Climate Change In Boreal Forest Birds, Joel Ralston
Legacy Theses & Dissertations (2009 - 2024)
In this dissertation, I combine ecological niche models (ENMs), which can be extrapolated through time to predict historic and future changes in species distributions, with mitochondrial and nuclear genetic markers to study the biogeographic consequences of historic and contemporary climate change on boreal forest birds, and in particular Blackpoll Warbler.