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Articles 9691 - 9720 of 16789
Full-Text Articles in Engineering
Electrochemical Conversion Reactions And Their Applications For Rechargeable Batteries, Ting Li, Han-Xi Yang
Electrochemical Conversion Reactions And Their Applications For Rechargeable Batteries, Ting Li, Han-Xi Yang
Journal of Electrochemistry
Electrochemical conversion reactions have received considerable interest as a new redox mechanism for constructing high capacity electrodes of rechargeable batteries. Without strict restrictions on the crystalline structure of the host lattice and the size of the associated ions, conversion reactions can take place in a variety of different metal compounds with different metal cations and deliver much higher reversible capacities through full utilization of all the oxidation states of the transition-metal compounds, opening up a new avenue for developing high capacity materials of rechargeable batteries. This paper briefly reviews the state of the art and challenges of conversion electrodes and …
Microstructure And Phase Analysis In Mn–Al And Zr–Co Permanent Magnets, Michael J. Lucis
Microstructure And Phase Analysis In Mn–Al And Zr–Co Permanent Magnets, Michael J. Lucis
Department of Mechanical and Materials Engineering: Dissertations, Theses, and Student Research
In America’s search for energy independence, the development of rare-earth free permanent magnets is one hurdle that still stands in the way. Permanent magnet motors provide a higher efficiency than induction motors in applications such as hybrid vehicles and wind turbines. This thesis investigates the ability of two materials, Mn-Al and Zr-Co, to fill this need for a permanent magnet material whose components are readily available within the U.S. and whose supply chain is more stable than that of the rare-earth materials. This thesis focuses on the creation and optimization of these two materials to later be used as the …
Electrospinning Of Polycaprolactone Core-Shell Nanofibers With Anti-Cancer Drug, Sakib Iqbal, Mujibur Khan, Saheem Absar, Andrew Diamanduros, Samuel Chambers
Electrospinning Of Polycaprolactone Core-Shell Nanofibers With Anti-Cancer Drug, Sakib Iqbal, Mujibur Khan, Saheem Absar, Andrew Diamanduros, Samuel Chambers
GS4 Student Scholars Symposium
Encapsulation of a model anti-cancer drug, 5-Fluorouracul (5-FU) into biocompatible core-shell nanofibers of polycaprolactone (PCL) nanofibers was fabricated using a coaxial electrospinning process. Our work aims to solve these issues using a novel method of fabrication of fibers featuring confinement of drugs within a biodegradable core-shell structure, thereby permitting sustained release of drugs to specific sites of treatment, such as tissues affected with tumor cells. The coaxial electrospinning was performed using a sheath polymer solution consisting of a 14 wt% PCL solution and a 5 wt% solution of 5-FU as the core solution. Dimethylformamide (DMF) was used as the solvent …
Crystal Nucleation Of Palladium-Doped Lithium Disilicate Glass, Gregory Humble
Crystal Nucleation Of Palladium-Doped Lithium Disilicate Glass, Gregory Humble
Symposium of Student Scholars
The effect of concentration of palladium particles on crystal nucleation was investigated for lithium disilicate glass. The heterogeneous nucleation rate for 470°C and 480°C were calculated for a concentration of 0.001% palladium by weight. The DTA method of measuring nucleation and crystallization was used in this calculation.
Interstitial Silicon Ions In Rutile Tio2 Crystals, Eric M. Golden, Nancy C. Giles, Shan Yang, Larry E. Halliburton
Interstitial Silicon Ions In Rutile Tio2 Crystals, Eric M. Golden, Nancy C. Giles, Shan Yang, Larry E. Halliburton
Faculty Publications
Electron paramagnetic resonance (EPR) is used to identify a new and unique photoactive silicon-related point defect in single crystals of rutile TiO2. The importance of this defect lies in its assignment to interstitial silicon ions and the unexpected establishment of silicon impurities as a major hole trap in TiO2. Principal g values of this new S=1/2 center are 1.9159, 1.9377, and 1.9668 with principal axes along the [¯110],[001], and [110] directions, respectively. Hyperfine structure in the EPR spectrum shows the unpaired spin interacting equally with two Ti nuclei and unequally with two Si nuclei. These silicon …
Resurrecting “Poor Man’S Purple”: A Transdisciplinary Study Of Color-Shifted Pigments Used In An Encaustic Fayum Mummy Portrait Of Ancient Egypt, Brittany Archuleta, Alaggio B. Laurino, Cameron E. Quade, John-Paul D. Stroud, Jared L. Talley, Brittany L. Cannon, Ron Garnys, Darryl P. Butt, Glenn Gates, Janice Neri
Resurrecting “Poor Man’S Purple”: A Transdisciplinary Study Of Color-Shifted Pigments Used In An Encaustic Fayum Mummy Portrait Of Ancient Egypt, Brittany Archuleta, Alaggio B. Laurino, Cameron E. Quade, John-Paul D. Stroud, Jared L. Talley, Brittany L. Cannon, Ron Garnys, Darryl P. Butt, Glenn Gates, Janice Neri
College of Engineering Presentations
During the Coptic period in Fayum Egypt, encaustic (i.e. wax) mummy portraits were painted onto wooden panels or linen and attached to the mummy trappings of the deceased. One such portrait, “32.6: The Bearded Man” (c. 170-180 AD), features an unidentified Roman-Egyptian displaying a purple clavi. The trace swath of purple in the portrait provides evidence as to the origins of the painting and the identity of the man. Nanoscale analysis of the pigment suggests a red organic material was color shifted using a metal salt to produce a “poor man’s purple” as opposed to the expensive murex purple traditionally …
Towards Molecular Modification Of Carbon Nanotube Junctions In Thin Film Transistors, Noelia Caloca, A. Nicole Chang, Kari Mclaughlin, David Estrada
Towards Molecular Modification Of Carbon Nanotube Junctions In Thin Film Transistors, Noelia Caloca, A. Nicole Chang, Kari Mclaughlin, David Estrada
College of Engineering Presentations
Carbon nanotube thin film transistors have recently been used on flexible and transparent substrates for applications in integrated circuits and display drivers. Such networks are of interest due to their relatively high carrier mobility and mechanical flexibility. However, the ION/IOFF ratio of these networks varies inversely with the carrier mobility, and advances in reducing the electrical and thermal resistance of nanotube junctions are needed to improve the device performance and reliability. The objective of this work is create a process to improve CNT TFT device performance by using 0-dimensional molecules to modify the physical properties of the …
Joining Of Uhtc Boride Composites Using Metallic Interlayer, Noritaka Saito, Kei Nishimura, Kunihiko Nakashima, Cesare Melandri, Laura Esposito
Joining Of Uhtc Boride Composites Using Metallic Interlayer, Noritaka Saito, Kei Nishimura, Kunihiko Nakashima, Cesare Melandri, Laura Esposito
Ultra-High Temperature Ceramics: Materials for Extreme Environment Applications III
No abstract provided.
Effect Of Ni-Nb Interlayer Thickness On Mechanical Property Of Hfb2 Composite Joints, Kou Honda, Noritaka Saito, Kunihiko Nakashima, Cesare Melandri, Laura Esposito
Effect Of Ni-Nb Interlayer Thickness On Mechanical Property Of Hfb2 Composite Joints, Kou Honda, Noritaka Saito, Kunihiko Nakashima, Cesare Melandri, Laura Esposito
Ultra-High Temperature Ceramics: Materials for Extreme Environment Applications III
No abstract provided.
An Oxidation Kinetic Analysis Of Hot Pressed Zirconium Carbide At High Temperature, Claudia Gasparrini, W.E. Lee, Richard Chater
An Oxidation Kinetic Analysis Of Hot Pressed Zirconium Carbide At High Temperature, Claudia Gasparrini, W.E. Lee, Richard Chater
Ultra-High Temperature Ceramics: Materials for Extreme Environment Applications III
No abstract provided.
Uhtc Composites: Processing, Performance And Future, Jon Binner
Uhtc Composites: Processing, Performance And Future, Jon Binner
Ultra-High Temperature Ceramics: Materials for Extreme Environment Applications III
No abstract provided.
Characterization Of Ultra High Temperature Ceramic Coatings Deposited By Vacuum Plasma Spraying, Diletta Sciti, Yeon Woo Yoo, Sea Hoon Lee
Characterization Of Ultra High Temperature Ceramic Coatings Deposited By Vacuum Plasma Spraying, Diletta Sciti, Yeon Woo Yoo, Sea Hoon Lee
Ultra-High Temperature Ceramics: Materials for Extreme Environment Applications III
No abstract provided.
Ultra-High Temperature Mechanical Properties Of Zirconium Diboride-Based Ceramics, W.G. Fahrenholtz, G.E: Hilmas
Ultra-High Temperature Mechanical Properties Of Zirconium Diboride-Based Ceramics, W.G. Fahrenholtz, G.E: Hilmas
Ultra-High Temperature Ceramics: Materials for Extreme Environment Applications III
No abstract provided.
Sustained Hypersonic Flight – It’S Harder Than Rocket Science, Michael Smart
Sustained Hypersonic Flight – It’S Harder Than Rocket Science, Michael Smart
Ultra-High Temperature Ceramics: Materials for Extreme Environment Applications III
No abstract provided.
Processing And Characterisation Of (Ta,Hf)C Ultra-High Temperature Ceramics., O. Cedillos, S. Grasso, D. Manara, D.D Jayaseelan, R. Konings, W.E. Lee
Processing And Characterisation Of (Ta,Hf)C Ultra-High Temperature Ceramics., O. Cedillos, S. Grasso, D. Manara, D.D Jayaseelan, R. Konings, W.E. Lee
Ultra-High Temperature Ceramics: Materials for Extreme Environment Applications III
No abstract provided.
Synthesis And Static Oxidation Testing Of Doped Hfb2 Powders, Pengxiang Zheng, Jon Binner, Bala Vaidhyanathan
Synthesis And Static Oxidation Testing Of Doped Hfb2 Powders, Pengxiang Zheng, Jon Binner, Bala Vaidhyanathan
Ultra-High Temperature Ceramics: Materials for Extreme Environment Applications III
No abstract provided.
Towards The Perfect Optical Fiber, John Ballato
Towards The Perfect Optical Fiber, John Ballato
Journal of the South Carolina Academy of Science
Optical fibers are being used in an ever more diverse array of applications today. Many of these modern applications are in high-power and, particularly, high power-per-unit-bandwidth systems where optical nonlinearities historically have not limited overall performance. Today, however, nominally weak effects, such as stimulated Brillouin scattering (SBS), are restricting continued scaling to higher optical powers. To address these limitations, the optical fiber industry has focused on fiber geometry-related solutions such as large mode area (LMA) designs. However, since all linear and nonlinear optical phenomena are fundamentally materials-based in origin, this paper identifies material solutions to present and future performance limitations …
Preface, George Franks, Carolina Tallon
Preface, George Franks, Carolina Tallon
Ultra-High Temperature Ceramics: Materials for Extreme Environment Applications III
No abstract provided.
Ultra-High Temperature Ceramics: Materials For Extreme Environment Applications Iii - Conference Program, George Franks, Carolina Tallon
Ultra-High Temperature Ceramics: Materials For Extreme Environment Applications Iii - Conference Program, George Franks, Carolina Tallon
Ultra-High Temperature Ceramics: Materials for Extreme Environment Applications III
No abstract provided.
Oxide Dispersion Strengthened Nickel Based Alloys Via Spark Plasma Sintering, Somayeh Pasebani, Aniket K. Dutt, Jatuporn Burns, Indrajit Charit, Rajiv S. Mishra
Oxide Dispersion Strengthened Nickel Based Alloys Via Spark Plasma Sintering, Somayeh Pasebani, Aniket K. Dutt, Jatuporn Burns, Indrajit Charit, Rajiv S. Mishra
Materials Science and Engineering Faculty Publications and Presentations
Oxide dispersion strengthened (ODS) nickel based alloys were developed via mechanical milling and spark plasma sintering (SPS) of Ni–20Cr powder with additional dispersion of 1.2 wt% Y2O3 powder. Furthermore, 5 wt% Al2O3 was added to Ni–20Cr–1.2Y2O3 to provide composite strengthening in the ODS alloy. The effects of milling times, sintering temperature, and sintering dwell time were investigated on both mechanical properties and microstructural evolution. A high number of annealing twins was observed in the sintered microstructure for all the milling times. However, longer milling time contributed to improved hardness and narrower …
Tip-Based Nanofabrication Of Arbitrary Shapes Of Graphene Nanoribbons For Device Applications, Huan Hu, Shouvik Banerjee, David Estrada, Rashid Bashir, William P. King
Tip-Based Nanofabrication Of Arbitrary Shapes Of Graphene Nanoribbons For Device Applications, Huan Hu, Shouvik Banerjee, David Estrada, Rashid Bashir, William P. King
Materials Science and Engineering Faculty Publications and Presentations
Graphene nanoribbons (GNRs) have promising applications in future nanoelectronics, chemical sensing and electrical interconnects. Although there are quite a few GNR nanofabrication methods reported, a rapid and low-cost fabrication method that is capable of fabricating arbitrary shapes of GNRs with good-quality is still in demand for using GNRs for device applications. In this paper, we present a tip-based nanofabrication method capable of fabricating arbitrary shapes of GNRs. A heated atomic force microscope (AFM) tip deposits polymer nanowires atop a CVD-grown graphene surface. The polymer nanowires serve as an etch mask to define GNRs through one step of oxygen plasma etching …
Assessing Viscoelastic Properties Of Polydimethylsiloxane (Pdms) Using Loading And Unloading Of The Macroscopic Compression Test, Mustafa Fincan
Assessing Viscoelastic Properties Of Polydimethylsiloxane (Pdms) Using Loading And Unloading Of The Macroscopic Compression Test, Mustafa Fincan
USF Tampa Graduate Theses and Dissertations
Polydimethylsiloxane (PDMS) mechanical properties were measured using custom-built compression test device. PDMS elastic modulus can be varied with the elastomer base to the curing agent ratio, i.e. by changing the cross-linking density. PDMS samples with different crosslink density in terms of their elastic modulus were measured. In this project the PDMS samples with the base/curing agent ratio ranging from 5:1 to 20:1 were tested. The elastic modulus varied with the amount of the crosslinker, and ranged from 0.8 MPa to 4.44 MPa. The compression device was modified by adding digital displacement gauges to measure the lateral strain of the sample, …
Elastic And Electronic Properties Of Ti2al(Cxn1−X) Solid Solutions, Sitaram Aryal, Ridwan Sakidja, Lizhi Ouyang, Wai-Yim Ching
Elastic And Electronic Properties Of Ti2al(Cxn1−X) Solid Solutions, Sitaram Aryal, Ridwan Sakidja, Lizhi Ouyang, Wai-Yim Ching
Mathematical Sciences Faculty Research
The elastic coefficients and mechanical properties (bulk modulus, shear modulus, Young's modulus and Poisson's ratio) of Ti2Al(CxN1−x) continuous solid solutions for x from 0 to 1 are calculated using ab initio DFT methods on 4×4×1 supercell models. It is shown that the properties of these solid solutions do not vary linearly with x. Although the lattice constant c is almost constant for x≤0.5, a increases linearly. For x>0.5, c starts to increase with x while the rate of increase in a slows down. For x between 0.5 and 0.85, the elastic coefficients and the mechanical parameters show interesting dependence …
Suitability Of Geoscan-M Elemental Analyser For Phosphate Rock, H. Kurth, Derek Griffiths
Suitability Of Geoscan-M Elemental Analyser For Phosphate Rock, H. Kurth, Derek Griffiths
Beneficiation of Phosphates VII
No abstract provided.
Smart, Sustainable Development Of Phosphate Resources: The Prospects For Phosphogypsum Utilization And Uranium Recovery, Julian Hilton
Smart, Sustainable Development Of Phosphate Resources: The Prospects For Phosphogypsum Utilization And Uranium Recovery, Julian Hilton
Beneficiation of Phosphates VII
No abstract provided.
Environmental Considerations For Treatment Of Effluent Waste Solutions And Solid Waste Products, Larry G. Twidwell
Environmental Considerations For Treatment Of Effluent Waste Solutions And Solid Waste Products, Larry G. Twidwell
Metallurgy
No abstract provided.
Noise Control By Structure And Material, Brian Tarling
Noise Control By Structure And Material, Brian Tarling
Thinking Matters Symposium Archive
An acoustic impedance testing tube is designed and constructed to test noise absorption properties of selected materials. The structure will be made to be convenient for demonstration purposes and real testing procedures while following ASTM E1050 standards as closely as possible. An engineering drawing as well as a 3D-‐CAD model of the structure is developed. Testing is conducted on selected materials; mainly ones that will allow obtained results to be compared to results found by other parties. Various sounds will be generated using Mathematical programming; the types of sound will include single frequency, wide band and narrow band noises. Microphones …
New Development In Dihydrate -Hemihydrate Processes: The New Prayon Da-Hf Process, Tibaut Theys
New Development In Dihydrate -Hemihydrate Processes: The New Prayon Da-Hf Process, Tibaut Theys
Beneficiation of Phosphates VII
No abstract provided.
An Alternative Flotation Process For Apatite Concentration Of The Itataia Carbonaceous Uranium-Phosphate Ore, Elves Matiolo, Ligia Gonzaga, Ana Luiza Guedes
An Alternative Flotation Process For Apatite Concentration Of The Itataia Carbonaceous Uranium-Phosphate Ore, Elves Matiolo, Ligia Gonzaga, Ana Luiza Guedes
Beneficiation of Phosphates VII
No abstract provided.
Column Flotation Of Phosphate Ore, Ewan Wingate, Michael Kelahan
Column Flotation Of Phosphate Ore, Ewan Wingate, Michael Kelahan
Beneficiation of Phosphates VII
No abstract provided.