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2015

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Articles 601 - 630 of 873

Full-Text Articles in Materials Science and Engineering

Interstitial Silicon Ions In Rutile Tio2 Crystals, Eric M. Golden, Nancy C. Giles, Shan Yang, Larry E. Halliburton Apr 2015

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 Apr 2015

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 Apr 2015

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 Apr 2015

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 Apr 2015

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 Apr 2015

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 Apr 2015

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 Apr 2015

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 Apr 2015

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 Apr 2015

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 Apr 2015

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 Apr 2015

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 Apr 2015

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 Apr 2015

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 Apr 2015

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 Apr 2015

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 Apr 2015

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 Apr 2015

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 Apr 2015

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 Apr 2015

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 Apr 2015

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 Apr 2015

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 Apr 2015

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 Apr 2015

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 Apr 2015

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 Apr 2015

Column Flotation Of Phosphate Ore, Ewan Wingate, Michael Kelahan

Beneficiation of Phosphates VII

No abstract provided.


Who Did What In Solvent Extraction A Demonstrated & Proven Technology For Uranium Recovery From Phosphoric Acid, Vaughn A, Regis Stana Apr 2015

Who Did What In Solvent Extraction A Demonstrated & Proven Technology For Uranium Recovery From Phosphoric Acid, Vaughn A, Regis Stana

Beneficiation of Phosphates VII

No abstract provided.


Improving Dolomite Collector Forflorida High-Mg Pebble, Chunhui Feng, Wenyi Song Apr 2015

Improving Dolomite Collector Forflorida High-Mg Pebble, Chunhui Feng, Wenyi Song

Beneficiation of Phosphates VII

No abstract provided.


Phosphate In Australia, Ewan Wingate, John Dunster Apr 2015

Phosphate In Australia, Ewan Wingate, John Dunster

Beneficiation of Phosphates VII

No abstract provided.


Application Of Classification And Fluidized Bed Flotation At Pcs Aurora, George Piegols, David Deplato, Jaisen Kohmuench, Eric Yan Apr 2015

Application Of Classification And Fluidized Bed Flotation At Pcs Aurora, George Piegols, David Deplato, Jaisen Kohmuench, Eric Yan

Beneficiation of Phosphates VII

No abstract provided.