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1,938 results on '"Rao, P. S. C."'

3. Topological Convergence of Urban Infrastructure Networks

Author

Klinkhamer, Christopher, Zischg, Jonathan, Krueger, Elisabeth, Yang, Soohyun, Blumensaat, Frank, Urich, Christian, Kaeseberg, Thomas, Paik, Kyungrock, Borchardt, Dietrich, Silva, Julian Reyes, Sitzenfrei, Robert, Rauch, Wolfgang, McGrath, Gavan, Krebs, Peter, Ukkusuri, Satish, and Rao, P. S. C.

Subjects
Nonlinear Sciences - Adaptation and Self-Organizing Systems, Physics - Physics and Society
Abstract

Urban infrastructure networks play a major role in providing reliable flows of multitude critical services demanded by citizens in modern cities. We analyzed here a database of 125 infrastructure networks, roads (RN); urban drainage networks (UDN); water distribution networks (WDN), in 52 global cities, serving populations ranging from 1,000 to 9,000,000. For all infrastructure networks, the node-degree distributions, p(k), derived using undirected, dual-mapped graphs, fit Pareto distributions. Variance around mean gamma reduces substantially as network size increases. Convergence of functional topology of these urban infrastructure networks suggests that their co-evolution results from similar generative mechanisms. Analysis of growing UDNs over non-concurrent 40 year periods in three cities suggests the likely generative process to be partial preferential attachment under geospatial constraints. This finding is supported by high-variance node-degree distributions as compared to that expected for a Poisson random graph. Directed cascading failures, from UDNs to RNs, are investigated. Correlation of node-degrees between spatially co-located networks are shown to be a major factor influencing network fragmentation by node removal. Our results hold major implications for the network design and maintenance, and for resilience of urban communities relying on multiplex infrastructure networks for mobility within the city, water supply, and wastewater collection and treatment.

Published
2019

7. Control of superluminal transit through a heterogeneous medium

Author

Kulkarni, M., Seshadri, N., Rao, V. S. C. Manga, and Gupta, S. Dutta

Subjects
Physics - Optics
Abstract

We consider pulse propagation through a two component composite medium (metal inclusions in a dielectric host) with or without cavity mirrors. We show that a very thin slab of such a medium, under conditions of localized plasmon resonance, can lead to significant superluminality with detectable levels of transmitted pulse. A cavity containing the heterogeneous medium is shown to lead to subluminal-to-superluminal transmission depending on the volume fraction of the metal inclusions. The predictions of phase time calculations are verified by explicit calculations of the transmitted pulse shapes. We also demonstrate the independence of the phase time on system width and the volume fraction under specific conditions., Comment: 21 Pages,5 Figures (Published in Journal of Modern Optics)

Published
2007
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30. Sucrose intolerance in adults with common functional gastrointestinal symptoms.

Author

Frissora, Christine L. and Rao, Satish S. C.

Abstract

Sucrose intolerance is a form of carbohydrate malabsorption caused by sucrase-isomaltase deficiency that is more common than recognized. Its symptoms include postprandial cramping, bloating, gas, and diarrhea, which are difficult to distinguish from irritable bowel syndrome. The gold standard test for diagnosing sucrase deficiency is a sucrase enzyme assay of duodenal biopsies obtained by endoscopy. Hydrogen-methane or 13C-sucrose breath tests are noninvasive methods to screen for sucrose malabsorption. This chart review included 258 consecutive adults (47 men and 211 women) with chronic unexplained gastrointestinal symptoms and suspected sucrose intolerance who were screened with a hydrogen-methane or 13C-sucrose breath test. The incidence of sucrose malabsorption with two different hydrogen-methane breath tests was 34.4% (21/61) (Commonwealth Diagnostics International, Inc., Salem, MA) and 40% (20/50) (Aerodiagnostics, Concord, MA). The incidence of sucrose malabsorption with the 13C-sucrose breath test was 26.5% (39/147). In a subgroup of patients with positive breath tests and clinical follow-up, counseling regarding diet and/or enzyme replacement led to symptomatic improvement in 26/43 (60%). In conclusion, sucrose malabsorption may present with irritable bowel syndrome symptoms in a proportion of adult patients, and breath tests may be useful in identifying sucrose malabsorption and differentiating it from other gastrointestinal disorders. [ABSTRACT FROM AUTHOR]

Published
2022
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48. Estimation of nonaqueous phase liquid-water interfacial areas in porous media following mobilizatio by chemical flooding

Author

Saripalli, K. Prasad, Annable, M. D., and Rao, P. S. C.

Subjects
Nonaqueous solvents -- Research, Hazardous wastes -- Research, Environmental issues, Science and technology
Abstract

Chemical flooding allows for the estimation of nonaqueous phase liquid (NAPL)-water interfacial areas in porous media following residual NAPL mobilization. An empirical model helped described the same relationship. Different salt concentrations enabled chemical flooding to occur at different total trapping numbers.

Published
1997

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