Faculty & Staff Research
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This community includes faculty journal articles deposited per Rice's Open Access Policy (more information about the policy can be found in this library guide) and additional faculty work. Items found in this community can also be found in the authors' departmental faculty publication collections.
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Item 1,4-Dioxane-degrading consortia can be enriched from uncontaminated soils: prevalence of Mycobacterium and soluble di-iron monooxygenase genes(Wiley, 2017) He, Ya; Mathieu, Jacques; da Silva, Marcio L.B.; Li, Mengyan; Alvarez, Pedro J.J.; Civil and Environmental EngineeringTwo bacterial consortia were enriched from uncontaminated soil by virtue of their ability to grow on 1,4-dioxane (dioxane) as a sole carbon and energy source. Their specific dioxane degradation rates at 30°C, pH = 7 (i.e. 5.7 to 7.1 g-dioxane per g-protein per day) were comparable to those of two dioxane-metabolizing archetypes: Pseudonocardia dioxanivoransCB1190 and Mycobacterium dioxanotrophicusPH-06. Based on 16S rRNA sequencing, Mycobacterium was the dominant genus. Acetylene inhibition tests suggest that dioxane degradation was mediated by monooxygenases. However, qPCR analyses targeting the tetrahydrofuran/dioxane monooxygenase gene (thmA/dxmA) (which is, to date, the only sequenced dioxane monooxygenase gene) were negative, indicating that other (as yet unknown) catabolic gene(s) were responsible. DNA sequence analyses also showed threefold to sevenfold enrichment of group 5 and group 6 soluble di-iron monooxygenase (SDIMO) genes relative to the original soil samples. Whereas biodegradation of trace levels of dioxane is a common challenge at contaminated sites, both consortia degraded dioxane at low initial concentrations (300 μg l−1) below detectable levels (5 μg l−1) in bioaugmented microcosms prepared with impacted groundwater. Overall, this work shows that dioxane-degrading bacteria (and the associated natural attenuation potential) exist even in some uncontaminated soils, and may be enriched to broaden bioaugmentation options for sites experiencing insufficient dioxane catabolic capacity.Item 1-bit Phase Shifters for Large-Antenna Full-Duplex mmWave Communications(IEEE, 2020) da Silva, José Mairton Barros Jr.; Sabharwal, Ashutosh; Fodor, Gábor; Fischione, CarloMillimeter-wave using large-antenna arrays is a key technological component for the future cellular systems, where it is expected that hybrid beamforming along with quantized phase shifters will be used due to their implementation and cost efficiency. In this paper, we investigate the efficacy of full-duplex mmWave communication with hybrid beamforming using low-resolution phase shifters. We assume that the self-interference can be sufficiently cancelled by a combination of propagation domain and digital self-interference techniques, without any analog self-interference cancellation. We formulate the problem of joint self-interference suppression and downlink beamforming as a mixed-integer nonconvex joint optimization problem. We propose LowRes, a near-to-optimal solution using penalty dual decomposition. Numerical results indicate that LowRes using low-resolution phase shifters perform within 3% of the optimal solution that uses infinite phase shifter resolution. Moreover, even a single quantization bit outperforms half-duplex transmissions, respectively by 29% and 10% for both low and high residual self-interference scenarios, and for a wide range of practical antenna to radio-chain ratios. Thus, we conclude that 1-bit phase shifters suffice for full-duplex millimeter-wave communications, without requiring any additional new analog hardware.Item 10 Questions: Debra Kolah(Special Libraries Association, 2011-04) Hales, StuartInterview with Debra Kolah, the founding chair of SLA's new user experience caucus.Item 10 Years of Research, Education and Outreach: 2002-2012(Rice University, 2012) Shell Center for SustainabilityItem 100 Years of Rice: Contemporary Responses to Tradition(Rice Design Alliance, 2011) Cottle, Mark; Khan, SabirItem 1500 Louisiana Street: Building a 21st-Century Skyline(Rice Design Alliance, 2002) Stern, William F.Item The 1944 U.S.-Mexico Water Treaty as a Constitutional Document(James A. Baker III Institute for Public Policy, 2019) Mumme, Stephen; James A. Baker III Institute for Public PolicyItem 1998 Rice Design Alliance Gala(Rice Design Alliance, 1999)Item 1D to 3D Crossover of a Spin-Imbalanced Fermi Gas(American Physical Society, 2016) Revelle, Melissa C.; Fry, Jacob A.; Olsen, Ben A.; Hulet, Randall G.; Physics and Astronomy; Rice Center for Quantum MaterialsWe have characterized the one-dimensional (1D) to three-dimensional (3D) crossover of a two-component spin-imbalanced Fermi gas of 6Li atoms in a 2D optical lattice by varying the lattice tunneling and the interactions. The gas phase separates, and we detect the phase boundaries using in situ imaging of the inhomogeneous density profiles. The locations of the phases are inverted in 1D as compared to 3D, thus providing a clear signature of the crossover. By scaling the tunneling rate t with respect to the pair binding energy εB, we observe a collapse of the data to a universal crossover point at a scaled tunneling value of ˜tc=0.025(7).Item 2 More Competitions Houston & Laredo(Rice Design Alliance, 1997) Fox, StephenItem A 2-D simulation study on CO2ﾠsoluble surfactant for foam enhanced oil recovery(Elsevier, 2019) Zeng, Yongchao; Farajzadeh, Rouhi; Biswal, Sibani L.; Hirasaki, George J.; Chemical and Biomolecular EngineeringThis paper probes the transport of CO2ﾠsoluble surfactant for foaming in porous media. We numerically investigate the effect of surfactant partitioning between the aqueous phase and the gaseous phase on foam transport for subsurface applications when the surfactant is injected in the CO2ﾠphase. A 2-D reservoir simulation is developed to quantify the effect of surfactant partition coefficient on the displacement conformance and CO2ﾠsweep efficiency. A texture-implicit local-equilibrium foam model is embedded to describe how the partitioning of surfactant between water and CO2ﾠaffects the CO2ﾠfoam mobility control when surfactant is injected in the CO2ﾠphase. We conclude that when surfactant has approximately equal affinity to both the CO2ﾠand the water, the transport of surfactant is in line with the gas propagation and therefore the sweep efficiency is maximized. Too high affinity to water (small partition coefficient) results in surfactant retardation whereas too high affinity to CO2ﾠ(large partition coefficient) leads to weak foam and insufficient mobility reduction. This work sheds light upon the design of water-alternating-gas-plus-surfactant-in-gas (WAGﾠ+ﾠS) process to improve the conventional foam process with surfactant-alternating-gas (SAG) injection mode during which significant amount of surfactant could possibly drain down by gravity before CO2ﾠslugs catch up to generate foam in situ the reservoir.Item 2007 Annual Report(Rice University, 2007) Shell Center for Sustainability; Shell Center for SustainabilityItem 2007 RDA Gala(Rice Design Alliance, 2008)Item 2008 Annual Report(Rice University, 2008) Shell Center for Sustainability; Shell Center for SustainabilityItem 2008 RDA Gala(Rice Design Alliance, 2008)Item 2009 Annual Report(Rice University, 2009) Shell Center for Sustainability; Shell Center for SustainabilityItem 2010 Annual Report(Rice University, 2010) Shell Center for Sustainability; Shell Center for SustainabilityItem 2010 Annual Report(James A. Baker III Institute for Public Policy, 2010) James A. Baker III Institute for Public Policy; James A. Baker III Institute for Public PolicyItem 2011 Annual Report(Rice University, 2011) Shell Center for Sustainability; Shell Center for SustainabilityItem 2011 Annual Report(James A. Baker III Institute for Public Policy, 2011) James A. Baker III Institute for Public Policy; James A. Baker III Institute for Public Policy