University of Alabama Institutional Repository: Recent submissions

Now showing items 1-20 of 3450

Stories Untold: Counter-Narratives to Anti-Blackness and Deficit-Oriented Discourse Concerning HBCUs

Williams, Krystal L.; Burt, Brian A.; Clay, Kevin L.; Bridges, Brian K. (2018)

Although there is empirical evidence concerning the value of historically Black colleges and universities (HBCUs), broader narratives about these institutions too often overemphasize challenges and depict them from a ...
Local charge writing in epitaxial SmNiO3 thin films

Yan, Feng; Schoofs, Frank; Shi, Jian; Ha, Sieu D.; Jaramillo, R.; Ramanathan, Shriram (2014-02-28)

We have investigated the evolution of work function in epitaxial correlated perovskite SmNiO3 (SNO) thin film spanning the metal-insulator transition (MIT) by Kelvin probe force microscopy (KPFM). Combining contact-mode ...
Crustal Structure beneath the Northern Transantarctic Mountains and Wilkes Subglacial Basin: Implications for Tectonic Origins

Hansen, Samantha E.; Kenyon, Lindsey M.; Graw, Jordan H.; Park, Yongcheol; Nyblade, Andrew A. (2016-02-13)

Key Points: New crustal constraints beneath the northern Transantarctic Mountains (TAMs). Crust thickens from ~20 km near the coast to ~41 km inland. Locally thicker crust may explain additional topography in the ...
Crustal and Upper-Mantle Structure Beneath Ice-Covered Regions in Antarctica from S-wave Receiver Functions and Implications for Heat Flow

Ramirez, C.; Nyblade, A.; Hansen, S. E.; Wiens, D. A.; Anandakrishnan, S.; Aster, R. C.; Huerta, A. D.; Shore, P.; Wilson, T. (2016)

S-wave receiver functions (SRFs) are used to investigate crustal and upper-mantle structure beneath several ice-covered areas of Antarctica. Moho S-to-P (Sp) arrivals are observed at ∼6–8 s in SRF stacks for stations in ...
Investigating the P Wave Velocity Structure beneath Harrat Lunayyir, Northwestern Saudi Arabia, using Double-Difference Tomography and Earthquakes from the 2009 Seismic Swarm

Hansen, Samantha E.; DeShon, Heather R.; Moore-Driskell, Melissa M.; Al-Amri, Abdullah M. S. (2013-09-12)

In 2009, a swarm of more than 30,000 earthquakes occurred beneath the Harrat Lunayyir lava field in northwest Saudi Arabia. This event was just one of several seismic swarms to occur in this region over the past decade. ...
Upper Mantle Seismic Anisotropy beneath the Northern Transantarctic Mountains, Antarctica from PKS, SKS, and SKKS Splitting Analysis

Graw, Jordan H.; Hansen, Samantha E. (2017-02-12)

Using data from the new Transantarctic Mountains Northern Network, this study aims to constrain azimuthal anisotropy beneath a previously unexplored portion of the Transantarctic Mountains (TAMs) to assess both past and ...
Rayleigh Wave Constraints on the Structure and Tectonic History of the Gamburtsev Subglacial Mountains, East Antarctica

Heeszel, David S.; Wiens, Douglas A.; Nyblade, Andrew A.; Hansen, Samantha E.; Kanao, Masaki; An, Meijan; Zhao, Yue (2013-05-10)

The Gamburtsev Subglacial Mountains (GSM), located near the center of East Antarctica, remain one of the most enigmatic mountain ranges on Earth. A lack of direct geologic samples renders their tectonic history almost ...
Upper Mantle Seismic Structure beneath Central East Antarctica from Body Wave Tomography: Implications for the Origin of the Gamburtsev Subglacial Mountains

Lloyd, Andrew J.; Nyblade, Andrew A.; Wiens, Douglas A.; Shore, Patrick J.; Hansen, Samantha E.; Kanao, Masaki; Zhao, Dapeng (2013-04-17)
Using S Wave Receiver Functions to Estimate Crustal Structure Beneath Ice Sheets: An Application to the Transantarctic Mountains and East Antarctic Craton

Hansen, Samantha E.; Julià, Jordi; Nyblade, Andrew A.; Pyle, Moira L.; Wiens, Douglas A.; Anandakrishnan, Sridhar (2009)

For seismic stations deployed on ice sheets, determining crustal structure using P wave receiver functions can be difficult since ice reverberations may mask P-to-S (Ps) conversions from the crust-mantle boundary (Moho). ...
Upper-Mantle Low-Velocity Zone Structure beneath the Kaapvaal Craton from S-Wave Receiver Functions

Hansen, Samantha E.; Nyblade, Andrew A.; Julià, Jordi; Dirks, Paul H. G. M.; Durrheim, Raymond J. (2009)

The southern African Plateau is marked by anomalously high elevations, reaching 1–2 km above sea level, and there is much debate as to whether this topography is compensated by a lower mantle source or by elevated ...
Seismic Velocity Structure and Depth-Dependence of Anisotropy in the Red Sea and Arabian Shield from Surface Wave Analysis

Hansen, Samantha E.; Gaherty, James B.; Schwartz, Susan Y.; Rodgers, Arthur J.; Al-Amri, Abdullah M. S. (2008-10-14)

We investigate the lithospheric and upper mantle shear wave velocity structure and the depth-dependence of anisotropy along the Red Sea and beneath the Arabian Peninsula using receiver function constraints and phase ...
Magnetic, ferroelectric, and dielectric properties of Bi(Sc0.5Fe0.5)O3–PbTiO3 thin films

Yan, F.; Sterianou, I.; Miao, S.; Reaney, I. M.; Lai, M. O.; Lu, L. (2009-04-01)
Effect of bottom electrodes on nanoscale switching characteristics and piezoelectric response in polycrystalline BiFeO3 thin films

Yan, F.; Zhu, T. J.; Lai, M. O.; Lu, L. (2011-10-17)

We have investigated the nanoscale switching characteristics and piezoelectric response based on polycrystalline BiFeO3 (BFO) thin films with different orientations deposited on different oxide bottom electrodes. The BFO ...
Role of Pb(Zr0.52Ti0.48)O3 substitution in multiferroic properties of polycrystalline BiFeO3 thin films

Yan, F.; Zhu, T. J.; Lai, M. O.; Lu, L. (2011-12-09)

Multiferroic materials are of considerable interest due to the intriguing science and application potential. Effects of Pb(Zr0.52Ti0.48)O3 (PZT) modification on the structural, electrical, ferroelectric domain structure ...
Strain effect on the surface potential and nanoscale switching characteristics of multiferroic BiFeO3 thin films

Yan, F.; Miao, S.; Zhu, T. J.; Lai, M. O.; Lu, L. (2012-03-28)

The BiFeO3 films were deposited on the SrTiO3 (001) substrates via tuning the thickness of the SrRuO3 (SRO) bottom electrode by pulsed laser deposition. The macroscopic ferroelectric and dielectric properties were ...
Orientation-dependent surface potential behavior in Nb-doped BiFeO3

Yan, F.; Xing, G. Z.; Islam, M.; Li, S.; Lu, L. (2012-04-23)

Single-phase epitaxial Nb doped BiFeO3 (BFNO) films have been grown on diverse oriented-SrTiO3 substrates by pulsed laser deposition. The orientation dependent surface potential distributions arising from combination of ...
Local probing of magnetoelectric coupling and magnetoelastic control of switching in BiFeO3-CoFe2O4 thin-film nanocomposite

Yan, Feng; Chen, Guannan; Lu, Li; Finkel, Peter; Spanier, Jonathan E. (2013-07-25)

We report on the combination of piezoresponse force microscopy (PFM), magnetic force microscopy, and local ferroelectric switching with magnetic field for the study of a thin-film magnetoelectric (ME) nanocomposite. The ...
Low temperature dependent ferroelectric resistive switching in epitaxial BiFeO3 films

Yan, F.; Xing, G. Z.; Li, L. (2014-04-02)

The ferroelectric switchable diode induced resistive switching behavior at low temperature has been investigated in the epitaxial BiFeO3 (BFO) thin films. The switchable diode can be tuned using a higher voltage at low ...
Ferromagnetic (Mn, N)-codoped ZnO nanopillars array: Experimental and computational insights

Wang, D. D.; Xing, G. Z.; Yan, F.; Yan, Y. S.; Li, S. (2014-01-16)

To reveal the mechanism responsible for ferromagnetism in transition metal and hole codoped oxide semiconductors, we carry out a comparative study on Mn-doped and (Mn, N)-codoped ZnO nanopillars. Compared with Mn-doped ...
Positive magnetoresistance in ferromagnetic Nd-doped In2O3 thin films grown by pulse laser deposition

Xing, G. Z.; Yi, J. B.; Yan, F.; Wu, T.; Li, S. (2014-05-23)

We report the magnetic and magnetotransport properties of (In0.985Nd0.015)2O2.89 thin films grown by pulse laser deposition. The clear magnetization hysteresis loops with the complementary magnetic domain structure reveal ...

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