Publications by Year: 2013

R. Fievet and Tinney, C. E., “Acoustic source indicators on a LES of a fully exanded jet,” 2013 Texas Fluid Dynamics Meeting, Lake Buchanan, TX. Lake Buchanan, TX, 2013.PDF icon a2013tfdm-fievet.pdf
R. Fievet, Tinney, C. E., Murray, N. E., Lyons, G., and Panickar, P., “Acoustic source indicators using LES in a fully expanded and heated supersonic jet,” 19th AIAA/CEAS Aeroacoustics Conference. AIAA Paper 2013-2093, Berlin, Germany, 2013.
H. G. Bagaria, Neilson, B. M., Worthen, A. J., Xue, Z., Yoon, K. Y., Cheng, V., Lee, J. H., Velagala, S., Huh, C., Bryant, S. L., Bielawski, C. W., and Johnston, K. P., “Adsorption of iron oxide nanoclusters stabilized with sulfonated copolymers on silica in concentrated NaCl and CaCl2 brine,” Journal of Colloid and Interface Science, vol. 398, pp. 217-226, 2013. Publisher's VersionAbstract
Transport of metal oxide nanoparticles in porous rock is of interest for imaging and oil recovery in subsurface reservoirs, which often contain concentrated brine. Various copolymers composed of acrylic acid and either 2-acrylamido-2-methylpropanesulfonate or styrenesulfonate were synthesized and adsorbed on iron oxide nanoclusters to provide colloidal stability and to achieve low adsorption on silica in high salinity brine composed of 8% wt. NaCl + 2% wt. CaCl2. Furthermore, the degree of adsorption of the nanoparticles on silica was controlled by modifying the acrylic acid groups in the copolymers with a series of diamines and triamines to add hydrophobicity. The adsorption on colloidal silica microparticles ranged from <1 mg/m(2) for highly charged hydrophilic surfaces on the iron oxide nanoparticles to 22 mg/m(2) for the most hydrophobic amine-modified surfaces, corresponding to monolayer coverages that ranged from 0.2% to 11.5%, respectively. The specific adsorption (mg-IO/m(2)-silica), monolayer coverage, and parameters for Langmuir isotherms were evaluated for various 10 nanoclusters as a function of the properties of the copolymers on their surfaces. (C) 2013 Elsevier Inc. All rights reserved.
T. Bui-Thanh and Ghattas, O., “Analysis of the Hessian for Inverse Scattering Problems Part III: Inverse Medium Scattering of Electromagnetic Waves in Three Dimensions,” Inverse Problems and Imaging, vol. 7, pp. 1139–1155, 2013.
J. Liu, Choe, J. K., Sasnow, Z., Shapley, J. R., Werth, C. J., and Strathmann, T. J., “Application of a Re-Pd bimetallic catalyst for treatment of perchlorate in waste ion-exchange regenerant brine,” Water Research, vol. 47, pp. 91–101, 2013.
B. A. Korgel, Johnston, K. P., Brosh, K., and Thurk, P., “Applications of light-emitting nanoparticles”. Google Patents, 2013.
B. Yang, Sharma, M., Wang, Y., and Tunnell, J. W., “Attenuation corrected fluorescence extraction using spatial frequency domain imaging system,” Proc. SPIE, vol. 8618. pp. 861809-861809-5, 2013. Publisher's VersionAbstract
In this paper, we present a novel approach to retrieve attenuation corrected fluorescence (ACF) in the image field. This approach can be applied to improve tumor identification for both diagnosis and treatment purpose. Furthermore, this approach will facilitate the development of fluorescence image-guided surgery.
B. Yang, Sharma, M., and Tunnell, J. W., “Attenuation-corrected fluorescence extraction for image-guided surgery in spatial frequency domain.,” J Biomed Opt, vol. 18, no. 8, pp. 80503, 2013.Abstract
A new approach to retrieve the attenuation-corrected fluorescence using spatial frequency-domain imaging is demonstrated. Both in vitro and ex vivo experiments showed the technique can compensate for the fluorescence attenuation from tissue absorption and scattering. This approach has potential in molecular image-guided surgery.
L. Gao, Guo, R., and Zhang, Z., “An Augmented Lagrangian Decomposition Approach for Infrastructure Maintenance and Rehabilitation Decisions under Budget Uncertainty,” Structure and Infrastructure Engineering: Maintenance, Management, Life-Cycle Design and Performance, vol. Vol. 9, pp. pp. 448-457, 2013.
P. Matuszyk and Torres-Verdín, C.,Back-propagating modes in elastic logging-while-drilling collars and their effect on PML stability,” Computers and Mathematics with Applications, vol. 66, pp. 2335-2343, 2013.Abstract
The Perfectly Matched Layer (PML) approach is widely used to implement the absorbing boundary conditions for coupled multi-physics wave propagation problems. However, it has been recognized that the solution in the PML absorbing layer can become unstable in the presence of back-propagating modes. This paper analyzes the spectral location of those modes excited by monopole acoustic sources in logging-while-drilling cylindrical tools. To recover the stability of the solution for such a class of problems involving the modeling of elastic cylindrical waveguides, we propose the implementation of artificial attenuation in the waveguide to dampen undesirable modes, thereby making their amplitude negligible in the PML absorbing layer due to the limited numerical accuracy and round-off errors.
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P. Matuszyk and Torres-Verdín, C.,Back-propagating modes in elastic logging-while-drilling collars and their effect on PML stability,” Computers and Mathematics with Applications, vol. 66, pp. 2335-2343, 2013.PDF icon PDF
C. Xu, Yang, Q., and Torres-Verdín, C., “Bayesian hypothesis testing: using fast well-log forward modeling to validate petrophysical rock typing and to quantify uncertainty in deepwater reservoirs (Expanded Abstract),” Society of Petrophysicists and Well Log Analysts 54th Annual Logging Symposium. Society of Petrophysicists and Well Log Analysts, New Orleans, LA, 2013.PDF icon PDF
C. Xu, Yang, Q., and Torres-Verdín, C., “Bayesian hypothesis testing: using fast well-log forward modeling to validate petrophysical rock typing and to quantify uncertainty in deepwater reservoirs (Expanded Abstract),” Society of Petrophysicists and Well Log Analysts (SPWLA) 54th Ann. Logging Symposium. New Orleans, Louisiana, 2013.PDF icon PDF
D. R. Birt, An, K. M., Weathers, A., Shi, L., Tsoi, M., and Li, X. Q., “"Brillouin Light Scattering Spectra as Local Temperature Sensors for Thermal Magnons and Acoustic Phonons,” Appl. Phys. Lett., vol. 102, pp. 082401, 2013. LinkAbstract
We demonstrate the use of the micro-Brillouin light scattering (micro-BLS) technique as a local temperature sensor for magnons in a permalloy (Py) thin film and phonons in the glass substrate. When the Py film is uniformly heated, we observe a systematic shift in the frequencies of two thermally excited perpendicular standing spin wave modes. Fitting the temperature dependent magnon spectra allows us to achieve a temperature resolution better than 2.5 K. In addition, we demonstrate that the micro-BLS spectra can be used to measure the local temperature of magnons and the relative temperature shift of phonons across a thermal gradient. Such local temperature sensors are useful for investigating spin caloritronic and thermal transport phenomena in general.
S. D. Fried, Wang, L. - P., Boxer, S. G., Ren, P., and Pande, V. S., “Calculations of the electric fields in liquid solutions,” The Journal of Physical Chemistry B, vol. 117, pp. 16236–16248, 2013.
S. K. Health, Bard, J. F., and Morrice, D. J., The Capacitated Multiple Traveling Purchaser Problem. Annals of Operations Research 203(1), 2013, pp. 295–323.
A. J. Worthen, Bryant, S. L., Huh, C., and Johnston, K. P., “Carbon dioxide‐in‐water foams stabilized with nanoparticles and surfactant acting in synergy,” AIChE Journal, vol. 59, no. 9, pp. 3490-3501, 2013. Publisher's VersionAbstract
Synergistic interactions at the interface of nanoparticles (bare colloidal silica) and surfactant (caprylamidopropyl betaine) led to the generation of viscous and stable CO2-in-water (C/W) foams with fine texture at 19.4 MPa and 50°C. Interestingly, neither species generated C/W foams alone. The surfactant became cationic in the presence of CO2 and adsorbed on the hydrophilic silica nanoparticle surfaces resulting in an increase in the carbon dioxide/water/nanoparticle contact angle. The surfactant also adsorbed at the CO2–water interface, reducing interfacial tension to allow formation of finer bubbles. The foams were generated in a beadpack and characterized by apparent viscosity measurements both in the beadpack and in a capillary tube viscometer. In addition, the macroscopic foam stability was observed visually. The foam texture and viscosity were tunable by controlling the aqueous phase composition. Foam stability is discussed in terms of lamella drainage, disjoining pressure, interfacial viscosity, and hole formation. © 2013 American Institute of Chemical Engineers AIChE J, 59: 3490–3501, 2013
T. McNelley, Oh-ishi, K., Swaminathan, S., Bradley, J., Krajewski, P. E., and Taleff, E. M., “Characteristics of the GBS-SDC Transition during Bi-axial Forming of AA5083,” Materials Science Forum, vol. 735, pp. 43–48, 2013. Publisher's VersionAbstract
Thermomechanical processing to enable superplasticity in AA5083 materials includes cold working followed by heating prior to hot blow forming. Upon heating for forming at 450°C, a B-type ({110}) rolling texture is replaced by a near-random texture with a weak superimposed cube orientation parallel to the sheet normal. The presence of refined grains 7 – 8μm in size reflects the predominance of particle-stimulated nucleation of recrystallization prior to forming. The subsequent evolution of microstructure, texture and cavitation behaviour during biaxial deformation in the solute drag creep (SDC) and grain boundary sliding (GBS) regimes will be presented.
A. K. Murthy, Stover, R. J., Hardin, W. G., Schramm, R., Nie, G. D., Gourisankar, S., Truskett, T. M., Sokolov, K. V., and Johnston, K. P., “Charged Gold Nanoparticles with Essentially Zero Serum Protein Adsorption in Undiluted Fetal Bovine Serum,” Journal of the American Chemical Society, vol. 135, pp. 7799-7802, 2013. Publisher's VersionAbstract
The adsorption of even a single serum protein molecule on a gold nanosphere used in biomedical imaging may increase the size too much for renal clearance. In this work, we designed charged similar to 5 nm Au, nanospheres coated with binary mixed-charge ligand monolayers that do not change in size upon incubation in pure fetal bovine serum (FBS). This lack of protein adsorption was unexpected in view of the fact that the Au surface was moderately charged. The mixed-charge monolayers were composed of anionic citrate ligands modified by place exchange with naturally occurring amino acids: either cationic lysine or zwitterionic cysteine ligands. The zwitterionic tips of either the lysine or cysteine ligands interact weakly with the proteins and furthermore increase the distance between the "buried" charges closer to the Au surface and the interacting sites on the protein surface. The nm nanospheres were assembled into similar to 20 nm diameter nanoclusters with strong near-IR absorbance (of interest in biomedical imaging and therapy) with a biodegradable polymer, PLA(1k)-b-PEG(10k)-b-PLA(1k). Upon biodegradation of the polymer in acidic solution, the nanoclusters dissociated into primary similar to 5 nm Au nanospheres, which also did not adsorb any detectable serum protein in undiluted FBS.
S. M. S. Kazmi, Parthasarthy, A. B., Song, N. E., Jones, T. A., and Dunn, A. K., “Chronic imaging of cortical blood flow using Multi-Exposure Speckle Imaging.,” Journal of cerebral blood flow and metabolism, vol. (accepted), 2013. Publisher's VersionAbstract
Chronic imaging of cerebral blood flow (CBF) is an important tool for investigating vascular remodeling after injury such as stroke. Although techniques such as Laser Speckle Contrast Imaging (LSCI) have emerged as valuable tools for imaging CBF in acute experiments, their utility for chronic measurements or cross-animal comparisons has been limited. Recently, an extension to LSCI called Multi-Exposure Speckle Imaging (MESI) was introduced that increases the quantitative accuracy of CBF images. In this paper, we show that estimates of chronic blood flow are better with MESI than with traditional LSCI. We evaluate the accuracy of the MESI flow estimates using red blood cell (RBC) photographic tracking as an absolute flow calibration in mice over several days. The flow measures computed using the MESI and LSCI techniques were found to be on average 10% and 24% deviant (n=9 mice), respectively, compared with RBC velocity changes. We also map CBF dynamics after photo-thrombosis of selected cortical microvasculature. Correlations of flow dynamics with RBC tracking were closer with MESI (r=0.88) than with LSCI (r=0.65) up to 2 weeks from baseline. With the increased quantitative accuracy, MESI can provide a platform for studying the efficacy of stroke therapies aimed at flow restoration.Journal of Cerebral Blood Flow & Metabolism advance online publication, 10 April 2013; doi:10.1038/jcbfm.2013.57.