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- Pictet-Spengler (3)
- X-Ray Diffraction (3)
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- Masers (2)
- Matter Power Spectrum (2)
- Tetrahydroisoquinoline (2)
- 4-HPAA (1)
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- Basin of Attraction (1)
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- Bromine -73 (1)
- Broyden's Method (1)
- CURE (1)
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- Class 1 Methanol Masers (1)
- Class 2 Methanol Masers (1)
- Community composition (1)
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Articles 1 - 30 of 37
Full-Text Articles in Physical Sciences and Mathematics
Implementation And Assessment Of A Course-Based Undergraduate Research Experience (Cure) In General Chemistry, Alissa Potts
Implementation And Assessment Of A Course-Based Undergraduate Research Experience (Cure) In General Chemistry, Alissa Potts
College of Science and Health Theses and Dissertations
Course-based undergraduate research experiences (CUREs) are growing in popularity in the chemistry community to replace traditional laboratory courses. This approach creates a research experience for a larger number of students than traditional research mentorship experiences offered at universities. CUREs can help students take ownership of projects, learn to design and troubleshoot experimental setups, problem-solve experiments that don’t have a “known answer”, and gain confidence in the laboratory. To assess the effectiveness of a general chemistry laboratory-based CURE course with DePaul students, the Experimental Design Ability Test (EDAT) and the Meaningful Learning in the Laboratory Instrument (MLLI) survey were given to …
Optical Variability Of Green Pea Galaxies, Julissa Marie Sarmiento
Optical Variability Of Green Pea Galaxies, Julissa Marie Sarmiento
College of Science and Health Theses and Dissertations
In this thesis, I am investigating the optical variability of Green Pea galaxies (GPs). GPs are good analogs to high-redshift galaxies, enabling us to learn more about the first galaxies in the universe. One of their key properties is their strong emission lines, some of which indicate the presence of an active galactic nucleus (AGN). An effective way to identify AGN is to look for stochastic variability in the optical light from the galaxy. Finding AGN in these galaxies would help us learn more about the formation and evolution of the supermassive black holes that power AGN. In this thesis, …
High Mass Star Formation And Methanol Masers, Nathanael Wilson
High Mass Star Formation And Methanol Masers, Nathanael Wilson
College of Science and Health Theses and Dissertations
Class I and Class II methanol (CH3OH) masers are believed to be good indicators for regions where high mass stars are being formed. High mass stars are important because they inuence the evolution of the Galaxy, but many details of their formation remain unknown. I present an investigation into the association of Class I and Class II CH3OH masers with high mass star formation in our Galaxy, in particular the evolutionary stages at which they occur. To do so, I have compared data on high mass star forming regions from the ATLASGAL survey with catalogs of Class I and Class …
Analyzing Domain Of Convergence For Broyden’S Method, Michael Bonthron
Analyzing Domain Of Convergence For Broyden’S Method, Michael Bonthron
College of Science and Health Theses and Dissertations
Broyden’s method is a quasi-Newton iterative method used to find roots of non-linear systems of equations. Research has shown and improved the rate of convergence for special cases and specific applications of the method. However, there is limited literature regarding the well-posedness of the method. In practice, a numerical method must reliably converge to the appropriate root. This paper will discuss the domain of attraction for the roots of a system found by using Broyden’s method. A method of approximating the radius of convergence of a root will be described which considers the largest disk centered at the root such …
"Examining Continent-Scale Variation In Aerial Arbuscular Mycorrhizal Fungi Communities Using Edna, Raechel Hearth
"Examining Continent-Scale Variation In Aerial Arbuscular Mycorrhizal Fungi Communities Using Edna, Raechel Hearth
College of Science and Health Theses and Dissertations
Arbuscular mycorrhizal (AM) fungi form an important symbiosis with plants that make these fungi critical for plant health and ecosystem functioning. Although previous studies have shown that AM fungi disperse through the air, few studies have examined which environmental factors may be impacting their dispersal and aerial community composition, especially at large geographical scales. The goal of this study was to determine which environmental factors influenced air-dispersed AM fungal species composition across five different research sites in the Midwest and Western regions of the United States. By collecting dust at three different heights in the air, using modified Wilson and …
Synthesis And Styrene Copolymerization Of Octyl 2-Cyano-3-(R-Phenyl)-2-Propenoates, Martin S. Wasilewski
Synthesis And Styrene Copolymerization Of Octyl 2-Cyano-3-(R-Phenyl)-2-Propenoates, Martin S. Wasilewski
College of Science and Health Theses and Dissertations
Novel alkyl ring-substituted octyl phenylcyanoacrylates (OPCA), RPhCH=C(CN)CO2CH2(CH2)6CH3, where R is H, 2-methyl, 3-methyl, 4-methyl, 4-ethyl, 4-propyl, 4-i-propyl, 4-butyl, 4-t-butyl, 4-i-butyl) were prepared and copolymerized with styrene. The ethylenes were synthesized by the piperidine catalyzed Knoevenagel condensation of ring-substituted benzaldehydes and octyl cyanoacetate, and characterized by CHN analysis, IR, 1H and 13C NMR. All the ethylenes were copolymerized with styrene in solution with radical initiation (ABCN) at 70°C. The compositions of the copolymers were calculated from nitrogen analysis. Compositions of ST-OPCA copolymers ranged from 18.6 % to 27.4% of …
Wavelet Packet Power Spectrum Of The Sdss Lyman-Alpha Forest: A Tool For Large-Scale Structure Detection, Jason Pero
Wavelet Packet Power Spectrum Of The Sdss Lyman-Alpha Forest: A Tool For Large-Scale Structure Detection, Jason Pero
College of Science and Health Theses and Dissertations
One of the goals of astrophysics is to obtain a full understanding how the Universe is organized on large scales and how structure evolved. In this thesis we develop a method of detecting structure on Mpc scales by measuring the one-dimensional power spectrum of the transmitted ux in the Lyman- forest. The method is based on the wavelet packet transform (WPT), which has several advantages over the Fourier transform. This includes reduced noise, resulting in less data manipulation and scrubbing in the early stages of analysis. Another advantage is localization of outliers in the data, which allows the general trend …
Anthraquinone Extraction And Quantification, Modification Of The Pictet-Spengler Reaction For The Creation Of Useful Isotopes And Use In Protein Ligation, Jermell Williams
Anthraquinone Extraction And Quantification, Modification Of The Pictet-Spengler Reaction For The Creation Of Useful Isotopes And Use In Protein Ligation, Jermell Williams
College of Science and Health Theses and Dissertations
The Pictet-Spengler reaction rates of three species known to exhibit the alpha effect will be compared to the rate of the amine functional group. This is part of a larger effort to to generate a bifunctional tool for protein ligation by attaching an alkyne or azide group to the amine. With this, the aldehyde tag method can be used to modify proteins in biological conditions cheaply, specifically, and efficiently.
Electrochemical Studies Of Organic And Organometallic Compounds In The Pursuit Of Electrocatalytic Carbon Dioxide Reduction, Joshua J. Ludtke
Electrochemical Studies Of Organic And Organometallic Compounds In The Pursuit Of Electrocatalytic Carbon Dioxide Reduction, Joshua J. Ludtke
College of Science and Health Theses and Dissertations
Carbon dioxide is the main contributor to the greenhouse effect in the world today; developing renewable energy sources and addressing anthropogenic CO2 release into the atmosphere are two key ways of addressing its increasing impact. Electrocatalytic reduction to products like methanol or carbon monoxide is one useful path to address the rapid increase of carbon dioxide, and the fac-M(bpy-R)(CO)3X family of complexes (M = Mn or Re; bpy-R = substituted 2,2’-bipyridine; X = Cl, Br, etc.) is one class of effective CO2 reduction catalysts. Although the capability of the rhenium complex Re(PyBimH)(CO)3Cl (PyBimH …
Long Term Variation Of Class I Methanol Masers, Nycole Wenner
Long Term Variation Of Class I Methanol Masers, Nycole Wenner
College of Science and Health Theses and Dissertations
Class I methanol masers in high mass star forming regions are generally found in outflows. There, shocks provide the collisional pumping that causes the population inversion necessary for maser action. Less is known about Class I methanol masers compared to Class II. A better understanding of Class I masers will allow them to be used as more effective probes of high mass star formation, about which much remains to be learned. In particular, the variability of these masers could potentially be used to investigate activity in high mass star forming regions. I present an investigation of the long-term variability of …
Analyzing Nanoscale Thermal Transport Using Time-Resolved X-Ray Diffraction, James Grammich
Analyzing Nanoscale Thermal Transport Using Time-Resolved X-Ray Diffraction, James Grammich
College of Science and Health Theses and Dissertations
Classical models of thermal transport breakdown at lengthscales below a few microns in many materials, including the surfaces of bulk semiconductors. This presents difficulties in the analysis and design of small electronic devices, where unexpected thermal effects can occur such as hot spots that deteriorate performance and limit speed. Time-resolved x-ray diffraction has been proposed as one method to investigate this regime of nanoscale thermal transport, especially inside semiconductor materials where other techniques can not penetrate or yield quantitative results. Towards this goal, this thesis benchmarks a new, portable, and fast open-source x-ray dynamical diffraction code (TRXD) for strained crystals …
Speckle Correlation Using A Deep Learning Algorithm On Newtonian Fluids, Sanskar Basnet
Speckle Correlation Using A Deep Learning Algorithm On Newtonian Fluids, Sanskar Basnet
College of Science and Health Theses and Dissertations
In soft-matter physics, Dynamic Light Scattering (DLS) stands out as the non-invasive technique designed to measure the size and distribution of particles using speckle correlation. Traditional DLS analysis performs a one-to-one mapping of the size with diffusion which is computationally costly, in addition to lacks in generalisation to seek deeper relationships amongst speckle patterns. A recent advancement in double-pulse speckle imaging allows for the temporal-correlation problem presented by DLS to be transformed into an image classification problem. In this prototype study, I probe the feasibility and efficacy of DLS data analysis of speckle correlation using Deep Learning (DL). To reduce …
The Crystal Structure Of (Cuxzn1-X)0:456in1:084ge0:46o3 (Cuzigo) Using Neutron And X-Ray Diffraction, Boluwatife A. Adekoya
The Crystal Structure Of (Cuxzn1-X)0:456in1:084ge0:46o3 (Cuzigo) Using Neutron And X-Ray Diffraction, Boluwatife A. Adekoya
College of Science and Health Theses and Dissertations
The solid solution (CuxZn(1-x))0.456In1.084Ge0.46O3 (CuZIGO) has a complex structure where zinc and copper partially occupy a site shared by indium and germanium. ZIGO, the x = 0 endpoint, is a potential transparent conducting oxide (TCO) with similar conductivity and transparency to cubic In2O3, which, when doped with Sn4+, is the most prevalent TCO. ZIGO structure possesses a tetragonal structure and has the ability to produce multiple new phases with an array of properties that are beneficial to identify and understand. Analyzing this structure is best done through chemical substitution to identify the newly produced phases. Copper is a suitable choice …
Synthesis And Styrene Copolymerization Of Chloro And Fluoro Ring-Substituted Isopropyl 2-Cyano-3-Phenyl-2-Propenoates, Alessandra Cimino
Synthesis And Styrene Copolymerization Of Chloro And Fluoro Ring-Substituted Isopropyl 2-Cyano-3-Phenyl-2-Propenoates, Alessandra Cimino
College of Science and Health Theses and Dissertations
Novel trisubstituted ethylenes (TSE), chloro and fluoro 2-cyano-3-phenyl-2-propenoic propenoates (XPhCH=C(CN)CO2CH(CH3)2) were prepared and copolymerized with styrene (ST). The monomers were synthesized by modified crossed aldol condensation reaction (Knoevenagel condensation) of chloro and fluoro ring-substituted benzaldehydes with isopropyl cyanoacetate using piperidine as catalyst. They were subsequently characterized by IR, 1H and 13C-NMR and CHN analysis as well. The novel TSE monomers formed were then copolymerized with styrene (ST) in solution at 70 °C and 1,1′-Azobis(cyclohexanecarbonitrile) (ABCN) was used as radical initiator of the reaction. The composition of the novel copolymers was calculated from …
Understanding Group Dynamics Within A Classroom Using Small Group Networks And Epistemological Framing, Katarzyna E. Pomian
Understanding Group Dynamics Within A Classroom Using Small Group Networks And Epistemological Framing, Katarzyna E. Pomian
College of Science and Health Theses and Dissertations
In this study, we examined interactions within student groups and between groups and instructors. A deeper exploration of group dynamics helps educators to more fully understand student groups and student learning within the classroom. Our data are from a two-week summer program for incoming college freshman that focuses on helping students develop metacognitive and self-assessment tools. With the intention of using Social Network Analysis (SNA), we took the novel approach of creating network graphs from video data as opposed to surveys. However, given the isolated nature of the groups, the quantitative measures of SNA were inappropriate for our small group …
Optical And X-Ray Studies Of Compact X-Ray Binaries In Ngc 5904, Vanshree Bhalotia
Optical And X-Ray Studies Of Compact X-Ray Binaries In Ngc 5904, Vanshree Bhalotia
College of Science and Health Theses and Dissertations
Globular clusters are the oldest objects in the Milky Way, serving as probes of early galactic evolution due to their chemically uncontaminated history. Compact binaries act as an internal energy source through their dynamical interactions, and measuring the types of X-ray binaries within a cluster provides an understanding of its stellar population and dynamics, as stellar collisional frequencies have been correlated to the number of X-ray sources detected in globular clusters. Compact binaries can be found by correlating X-ray positional data with optical imaging data. In this project, optical fluxes of sources from archival HST images of NGC 5904 have …
"Effect Of Zinc And Strontium Dopants On The Structure And Stability Of Hydroxyapatite At High Temperatures", Dylan Correll Smith
"Effect Of Zinc And Strontium Dopants On The Structure And Stability Of Hydroxyapatite At High Temperatures", Dylan Correll Smith
College of Science and Health Theses and Dissertations
Hydroxyapatite (HA) is a bioceramic that synthetically mimics human bone. It is commonly used in medical applications as a filler for damaged bone, and in procedures such as dental implants and hip replacements. Doping of HA with elements such as zinc and strontium is known to increase the bioactivity of HA, as well as increase the retention and adsorption of therapeutic molecules for drug delivery. High-temperature, in-situ X-ray diffraction data were measured on 10 at. % zinc-doped, 10 at. % strontium-doped, and undoped HA powders at the Advanced Photon Source at Argonne National Laboratory. This research studied the temporal and …
Probing The Non-Linearity In Galaxy Clusters Through The Analysis Of Fractal Dimension Via Wavelet Transform, Loay Ali Khalifa
Probing The Non-Linearity In Galaxy Clusters Through The Analysis Of Fractal Dimension Via Wavelet Transform, Loay Ali Khalifa
College of Science and Health Theses and Dissertations
The study of large scale structure (LSS) of the Universe armed with both all-sky surveys and numerical simulations has become an increasingly important tool to probe basic cosmology. We used the method of wavelet transforms combined with the fractal based point-processes to investigate the clustering of matter on galactic scales through the fractal analysis approach. In particular, we developed a method to calculate the angular fractal dimension of galaxy distributions as a function of the cosmological comoving space. Taking advantage of the self-similarity and lo- calization properties of the wavelets, allows us to compute the fractal dimension of galaxies in …
Toward Improving Metalloenzyme Inhibitor Design: A Thermodynamic Study Of Small Molecule Interactions With Copper(Ii), Cobalt(Ii) And Manganese(Ii), Fatimah Aldakheel
Toward Improving Metalloenzyme Inhibitor Design: A Thermodynamic Study Of Small Molecule Interactions With Copper(Ii), Cobalt(Ii) And Manganese(Ii), Fatimah Aldakheel
College of Science and Health Theses and Dissertations
This work aimed at understanding the interactions of 1) three physiologically relevant transition metal ions copper(II), cobalt(II) and manganese(II) with five tri- or tetra-dentate metal chelators (ligand or L) and 2) the resulting ML complexes with two known metalloenzyme inhibitors, 8-hydroxyquinoline (8-HQ) and acetohydroxamic acid (AHA). The ultimate goal of the work was to identify ligands that can form enzyme active site M2+ structural mimetics capable of interacting with metalloenzyme active site inhibitors. The ligands studied were N-(2-(1-methylimidazolyl)methyl)iminodiacetic acid (DA2Im), nitrilotriacetic acid (NTA), tris(2-aminoethyl)amine (TREN), tris(2-pyridylmethyl)amine (TPA), and bis(2-picolyl)amine (BPA) and they were chosen to mimic the coordination environment …
Uv-Vis And Fluorescence Studies Of Zinc Enzyme Active Site Mimics And Their Binding Of Inhibitor Compounds, Aeshah Hussain Niyazi
Uv-Vis And Fluorescence Studies Of Zinc Enzyme Active Site Mimics And Their Binding Of Inhibitor Compounds, Aeshah Hussain Niyazi
College of Science and Health Theses and Dissertations
This research aimed to synthesize and characterize Zn2+-ligand complexes that have the same zinc coordination environment as in histone deacetylase (HDAC) and other important zincdependent enzymes. Mimicking the structural and the functional properties of Zn2+-enzymes will allow us to understand the binding reactivity between Zn2+ and small molecule enzyme inhibitors. The new understanding will help to develop new approaches to target disease states such as cancer. A variety of Zn2+ binary complexes have been synthesized and their interactions with inhibitors such as suberanilohydroxamic acid (SAHA) and 8-Hydroxyquinoline (8HQ) have been studied using 1H NMR, UV-Vis, and fluorescence spectroscopies. Attempts were …
Examination Of The B Coefficient In Gap Crystal Utilizing Single And Double Photon Absorption, Ines Kusmic
Examination Of The B Coefficient In Gap Crystal Utilizing Single And Double Photon Absorption, Ines Kusmic
College of Science and Health Theses and Dissertations
A laser of 0.800 mm at 100 fs is utilized in obtaining a b coefficient in a GaP crystal associated with double photon absorption. Data is collected for the incident power of the laser for both single and double photon absorption, and it is plotted against the signal generated in the photodiode containing the GaP crystal. The slope of such a plot is employed in calculating b with equations derived in the theoretical model that is unique to the present work. The data for single photon absorption is utilized in calculating the thickness of the GaP crystal, while the data …
An Application Of Wavelet Methods To The Search For Baryon Acoustic Oscillations, Kevin Michael Kadowaki
An Application Of Wavelet Methods To The Search For Baryon Acoustic Oscillations, Kevin Michael Kadowaki
College of Science and Health Theses and Dissertations
We use the method of wavelet transforms to investigate the clustering of matter on galactic scales in search of Baryon Acoustic Oscillations (BAOs). In particular, we develop a method of wavelet packet analysis to measure the power spectrum of a galaxy distribution and apply this method to the CMASS galaxy catalogue from the Sloan Digital Sky Survey (SDSS) Baryon Oscillation Spectroscopic Survey (BOSS) collaboration. Using a variant of HEALPix, we project the data from the celestial sphere onto a square signal matrix, and take the two-dimensional Wavelet Packet Transform of this signal. We use this transform and techniques of spectrum …
Enzyme-Mediated And Mechanistic Investigations Of Tetrahydroisoquinoline Synthesis Through The Pictet-Spengler Reaction, Jordan Elise Fauser
Enzyme-Mediated And Mechanistic Investigations Of Tetrahydroisoquinoline Synthesis Through The Pictet-Spengler Reaction, Jordan Elise Fauser
College of Science and Health Theses and Dissertations
Tetrahydroisoquinolines (THI) are biologically active natural products with applications to a variety of diseases. These compounds also act as precursors for other pharmacologically active natural products. In this investigation, a new synthetic approach for generation of halogenated THIs was proposed. Using cross-linked tyrosinase aggregate, halogenated tyrosine and tyramine were oxidized to form halogenated catechols such as halogenated L-DOPA and dopamine. In a one-pot synthetic approach, the enzyme oxidation reaction was coupled to the Pictet-Spengler reaction, through the addition of an aldehyde, to generate halogenated THIs. The Pictet-Spengler reaction was catalyzed by the phosphate buffer in the reaction solution. The role …
Chemical Reaction Kinetics Of The Pictet-Spengler Reaction, Jo Ann K. Girel
Chemical Reaction Kinetics Of The Pictet-Spengler Reaction, Jo Ann K. Girel
College of Science and Health Theses and Dissertations
There is an extensive history of the use of alkaloids for medicinal purposes. Today, development of novel pharmaceutical alkaloids is imperative to developing effective drugs. The Pictet-Spengler reaction of dopamine with 4-hydroxyphenyl-acetaldehyde is the first step in the biosynthesis of thousands of known alkaloids. In this reaction, mechanisms have been proposed to explain the specificity of phosphate catalysis. However, the uniqueness of the phosphate ion in the Pictet-Spengler reaction is not explained. The Pictet-Spengler reaction of dopamine with propanal in phosphate buffer and in maleic acid buffer were evaluated and determined to be comparable. The reaction was found to be …
Multiwavelength X-Ray Diffraction, Maziar Saleh Ziabari
Multiwavelength X-Ray Diffraction, Maziar Saleh Ziabari
College of Science and Health Theses and Dissertations
The central problem of diffraction theory is determining the structure of an object given only the intensity of its diffraction pattern. In general, both the amplitude and phase must be known to uniquely solve a structure; however a coherent radiation source is usually required in order to measure the diffacted phases (e.g. in holography). In many important cases, coherent sources are unavailable and other assumptions or methods must be employed to substitute for the missing phase information. One method that has been successfully applied to the specific problem of determining atomic structure from X-ray diffraction intensity patterns has been the …
Synthesis And Exploration Of Dopamine And 4‐ Hpaa Analogs For Norcoclaurine Synthase, Arthur A. Ralko
Synthesis And Exploration Of Dopamine And 4‐ Hpaa Analogs For Norcoclaurine Synthase, Arthur A. Ralko
College of Science and Health Theses and Dissertations
Precursor directed biosynthesis (PDB) presents a useful approach for modifying large scale drug and drug lead mole cules . Large molecular structures are synthetically modified as part of total synthesis approach, and often result in l ow yield and expensive r eagents. Of particular interest are plant alkaloid drugs, many of which come from tetrahydroisoquinoline (THI) precursor. We present an organic synthesis of novel dopamine and 4 - hydroxyphenacetaldehyde (4-HPAA) analogs as precursors for enzymatic conversion to tetrahydroisoquinoline analogs using norcoclaurine synthase (NCS) . Modifications for investigation include halogenation of the 2 and 5 positions of the aromatic ring and …
Time Resloved Saxs Analysis Of Fusion Protein, Matthew Andorf
Time Resloved Saxs Analysis Of Fusion Protein, Matthew Andorf
College of Science and Health Theses and Dissertations
The structural dynamics of the fusion protein (F protein) of parainfluenza virus 5 (PIV 5) was studied using time resolved Small Angle X-ray Scattering (SAXS). Conformational changes of the F protein, equivalent to the conformational changes the protein must undergo while infecting a host cell, are triggered by temperature jump to the protein in solution. The time and temperature dependence of the rate of the protein changing state is then determined through standard SAXS analysis. Thermodynamic transition state theory is then used to calculate the activation energy, enthalpy and entropy of the transition which is independent of any particular model. …
Synthesis And Evaluation Of Unnatural Hpaa, Norcoclaurine, And Tyramine Analogues, Sean Crowe
Synthesis And Evaluation Of Unnatural Hpaa, Norcoclaurine, And Tyramine Analogues, Sean Crowe
College of Science and Health Theses and Dissertations
There are several approaches to obtaining unnatural analogues of natural products. One of these approaches is precursor-directed biosynthesis (PDB), which is the process of using natural biosynthetic machinery to transform unnatural analogues of precursor compounds to produce an unnatural analogue of a target natural product. Berberine and galanthamine are chosen as model systems for the evaluation of PDB for the production of aromatic alkaloids in plants. Several approaches to the synthesis of unnatural 4 hydroxyphenylacetaldehyde (HPAA), norcoclaurine, and tyramine analogues are explored. 3-chloro-, 3-bromo-, and 3-iodoHPAA are all synthesized in good yields via and oxidative decarboxylation of tyrosine. These analogues …
Structural Studies Of Proteins In Solution: Cytochrome-C And Mitochondrial Rho, Anthony Banks
Structural Studies Of Proteins In Solution: Cytochrome-C And Mitochondrial Rho, Anthony Banks
College of Science and Health Theses and Dissertations
Small Angle X-Ray Scattering (SAXS) is a rapidly developing technique for determining the structures of proteins in solution. This thesis presents new solution structures of two proteins:cold denatured equine cytochrome-c,and mitochondrial rho (miro).Cytochrome-cis a modelsystem for protein folding and stability studies;this work demonstrates the interplay of thermodynamic forces in determining the global shape of unfolded proteins.Whereas denatured cytochrome-cis not able to form crystals in principle,miro is a newly purified protein of which no crystal structure is availablein any conditions.We have used our SAXS data to verify conjectures for miro's structure based solely on protein sequence analysis.
The Effect Of Grain Size And Forming Gas Reduction On The Electrical Properties Of Zinc Oxide, Rofeideh Mansourian
The Effect Of Grain Size And Forming Gas Reduction On The Electrical Properties Of Zinc Oxide, Rofeideh Mansourian
College of Science and Health Theses and Dissertations
Zinc oxide is an n-type transparent conducting oxide (TCO), which is used in solar cells and optoelectronics devices. ZnO has the potential to become the future choice for a wide range of TCO commercial applications replacing the current, more expensive, and toxic indium-based materials. The isothermal grain growth of ZnO nano-powders with two different initial grain sizes and the effect of forming gas reduction on their electrical properties were studied at 900 °C. The particle size was determined using synchrotron x-ray diffraction data and scanning electron micrographs. The grain size, shape, trace impurities, and synthesis methods had an effect on …