Publications

2017
E. D. Maalouf and Torres-Verdín, C., “Estimation of rock stiffness coefficients in VTI formations using LWD acoustic measurements (Expanded Abstract),” Society of Petrophysicists and Well Log Analysts (SPWLA) 58th Ann. Logging Symposium. Oklahoma City, OK, June 17-21, 2017.
J. Selvakumar and Bakolas, E., “Evasion with Terminal Constraints from a Group of Pursuers using a
Matrix Game Formulation
,” American Control Conference. Seattle, WA, 2017.PDF icon jseb_acc17.pdf
K. Chen, Ghosh, R., Meng, X., Roy, A., Kim, J. - S., He, F., Mason, S. C., Xu, X., Lin, J. - F., Akinwande, D., Banerjee, S. K., and Wang, Y., “Experimental evidence of exciton capture by mid-gap defects in CVD grown monolayer MoSe2,” npj 2D Materials and Applications, vol. 1, pp. 1-15, 2017. Publisher's VersionAbstract
In two dimensional (2D) transition metal dichalcogenides, defect-related processes can significantly affect carrier dynamics and transport properties. Using femtosecond degenerate pump-probe spectroscopy, exciton capture, and release by mid-gap defects have been observed in chemical vapor deposition (CVD) grown monolayer MoSe2. The observed defect state filling shows a clear saturation at high exciton densities, from which the defect density is estimated to be around 0.5 × 1012/cm2. The exciton capture time extracted from experimental data is around ~ 1 ps, while the average fast and slow release times are 52 and 700 ps, respectively. The process of defect trapping excitons is found to exist uniquely in CVD grown samples, regardless of substrate and sample thickness. X-ray photoelectron spectroscopy measurements on CVD and exfoliated samples suggest that the oxygen-associated impurities could be responsible for the exciton trapping. Our results bring new insights to understand the role of defects in capturing and releasing excitons in 2D materials, and demonstrate an approach to estimate the defect density nondestructively, both of which will facilitate the design and application of optoelectronics devices based on CVD grown 2D transition metal dichalcogenides.
J. Shiriyev, Brick, Y., Zhang, P., Yilmaz, A. E., Torres-Verdín, C., Sharma, M., Hosbach, T., Oerkfitz, M. A., and Gabelmann, J., “Experiments and simulations of a prototype tri-axial electromagnetic induction logging tool for open-hole hydraulic fracture diagnostics,” Geophysics, vol. 83, no. 3, pp. D7-D81, 2017.
X. Chen, Huo, X., Liu, J., Wang, Y., Werth, C. J., and Strathmann, T. J., “Exploring beyond palladium: catalytic reduction of aqueous oxyanion pollutants with alternative platinum group metals and new mechanistic implications,” Chemical Engineering Journal, vol. 313, pp. 745-752, 2017. Publisher's VersionAbstract
For over two decades, Pd has been the primary hydrogenation metal studied for reductive catalytic water treatment applications. Herein, we report that alternative platinum group metals (Rh, Ru, Pt and Ir) can exhibit substantially higher activity, wider substrate selectivity and variable pH dependence in comparison to Pd. Cross comparison of multiple metals and oxyanion substrates provides new mechanistic insights into the heterogeneous reactions. Activity differences and pH effects mainly originate from the chemical nature of individual metals. Considering the advantages in performance and cost, results support renewed investigation of alternative hydrogenation metals to advance catalytic technologies for water purification and other environmental applications.
J. H. Stephenson and Tinney, C. E., “Extracting Blade-Vortex Interactions Using Continuous Wavelet Transforms,” Journal of the American Helicopter Society, vol. 62, no. 022001, pp. 1-10, 2017.Abstract
A framework for using continuous wavelet transforms to isolate and extract blade–vortex interaction noise from helicopter acoustic signals is described. The extraction method allows for the investigation of blade–vortex interactions independent of other sound sources. Experimentally acquired acoustic data from full-scale helicopter flyover tests are first transformed into time-frequency space through the wavelet transformation, with blade–vortex interactions identified and filtered by their high-amplitude, high-frequency impulsive content. The filtered wavelet coefficients are then used to create a pressure signal solely related to blade–vortex interactions. Analysis of a synthetic data set is conducted and shows that blade–vortex interactions can be accurately extracted so long as the blade–vortex interaction wavelet energy is comparable to the wavelet energy in the main rotor harmonic.
PDF icon j2017ahs-stephenson-v62.pdf
P. Joseph, Singhal, S., Abed, O., and Sreenivasan, S. V., “Fabrication of self-aligned multilevel nanostructures,” Microelectronic Engineering, vol. 169, pp. 49-61, 2017. DOIAbstract
Multilevel three-dimensional nanostructures are essential in many integrated nanoelectronic and nanophotonic applications. With the continued shrinking of critical device dimensions, extremely precise nanoscale overlay is required between multiple individual levels of these integrated devices. Multilevel nanoimprint lithography has been proposed in the literature as a potential solution to this overlay problem. In this context, self-aligned (perfectly aligned) multilevel templates (SAMT) for multilevel nanoimprint lithdgraphy are proposed in this article. By combining nanolithography, atomic layer deposition, and highly selective reactive ion etch, SAMTs can enable the fabrication of sophisticated integrated devices. Four specific self-aligned multilevel fabrication techniques have been demonstrated that result in symmetric multilevel structures, bilaterally symmetric multilevel structures, tubular structures, and asymmetric multilevel structures, all in the sub-100 nm scale. When used in conjunction with a nanoimprint lithography process, the SAMTs can enable high-throughput patterning of various nanoelectronic and nanophotonic devices using a single patterning step with perfect alignment and overlay. SAMTs further enable large area patterning, such as wafer-scale patterning and roll-to-roll patterning on flexible substrates, without compromising perfect overlay. (C) 2016 Elsevier B.V. All rights reserved.
A. Rodríguez-Rozas, Pardo, D., and Torres-Verdín, C., “Fast 3D inversion of borehole resistivity measurements using a dimension-adaptive simulation method (Expanded Abstract),” Sixth International Symposium on Three-Dimensional Electromagnetics. Berkeley, CA, March 28-30, 2017.
S. A. Bakr, Pardo, D., and Torres-Verdín, C., “Fast inversion of logging-while-drilling resistivity measurements acquired in multiple wells,” Geophysics, vol. 82, no. 3, pp. E111-E120, 2017.
A. Rodríguez-Rozas, Pardo, D., and Torres-Verdín, C., “Fast simulation of 2.5D LWD resistivity tools (Expanded Abstract),” European Association of Geoscientists and Engineers (EAGE) 79th Ann. Conference and Exhibition. Paris, France, June 12-15, 2017.
S. Huang and Torres-Verdín, C., “Fast-forward modeling of compressional arrival slowness logs in high-angle and horizontal wells.,” Geophysics, vol. 82, no. 2, pp. D105-D120, 2017.
S. Huang and Torres-Verdín, C., “Fast-forward modeling of compressional arrival slowness logs in high-angle and horizontal wells.,” Geophysics, vol. 82, no. 2, pp. D105-D120, 2017.
E. Bakolas, “On the finite time capture of a fast moving target,” Optimal Control, Applications and Methods, vol. 38, no. 5, pp. 778-794, 2017.PDF icon jocam_2016_eb.pdf
H. Daigle, Hayman, N. W., Kelly, E. D., Milliken, K. L., and Jiang, H., “Fracture capture of organic pores in shales,” Geophysical Research Letters, 2017.
C. van der Hoeven, Montgomery, M., Sablan, G., Schneider, E., and Torres-Verdín, C., “Gadolinium tracers for enhancement of Sigma-log contrast measurements.,” Geophysics, vol. 82, no. 1, pp. EN13-EN24, 2017.
C. van der Hoeven, Montgomery, M., Sablan, G., Schneider, E., and Torres-Verdín, C., “Gadolinium tracers for enhancement of Sigma-log contrast measurements.,” Geophysics, vol. 82, no. 1, pp. EN13-EN24, 2017.
X. Meng, Pandey, T., Fu, S., Yang, J., Jeong, J., Chen, K., Singh, A., He, F., Xu, X., Singh, A. K., Lin, J. - F., and Wang, Y., “Giant Thermal Conductivity Enhancement in Multilayer MoS2 under Highly Compressive Strain,” eprint arXiv:1708.03849, 2017. Publisher's VersionAbstract
Multilayer MoS2 possesses highly anisotropic thermal conductivities along in-plane and cross-plane directions that could hamper heat dissipation in electronics. With about 9% cross-plane compressive strain created by hydrostatic pressure in a diamond anvil cell, we observed about 12 times increase in the cross-plane thermal conductivity of multilayer MoS2. Our experimental and theoretical studies reveal that this drastic change arises from the greatly strengthened interlayer interaction and heavily modified phonon dispersions along cross-plane direction, with negligible contribution from electronic thermal conductivity, despite its enhancement of 4 orders of magnitude. The anisotropic thermal conductivity in the multilayer MoS2 at ambient environment becomes almost isotropic under highly compressive strain, effectively transitioning from 2D to 3D heat dissipation. This strain tuning approach also makes possible parallel tuning of structural, thermal and electrical properties, and can be extended to the whole family of 2D Van der Waals solids, down to two layer systems.
A. Weathers, Carrete, J., DeGrave, J. P., Higgins, J. M., Moore, A. L., Kim, J., Mingo, N., Jin, S., and Shi, L., “Glass-like thermal conductivity in nanostructures of a complex anisotropic crystal,” Phys. Rev. B, vol. 96, pp. 214202, 2017. Publisher's Version
K. Yang, Yilmaz, A. E., and Torres-Verdín, C., “A goal oriented framework for rapid integral-equation-based simulation of borehole resistivity measurements of 3D hydraulic fractures.,” Geophysics, vol. 82, no. 2, pp. D121-D131, 2017.
K. Yang, Yilmaz, A. E., and Torres-Verdín, C., “A goal oriented framework for rapid integral-equation-based simulation of borehole resistivity measurements of 3D hydraulic fractures.,” Geophysics, vol. 82, no. 2, pp. D121-D131, 2017.

Pages