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1,260 results on '"Hussain, Riaz"'

1. The Case for SDG 6 in a Post-COVID-19 World: How targeted investment in water and sanitation can boost resilience

Author

Hussain, Riaz

Subjects
Aid, Approach and methodology, Health, Water, sanitation and hygiene
Abstract

Oxfam and Unilever commissioned this research to test the hypothesis that increased investment in sustainable WASH access can help to improve preparedness towards any future global pandemic. By strengthening health and economic outcomes now, we also lessen the potential impact of future pandemics. The right investment breaks the cycle of low resilience leading to more extreme impacts that further corrode resilience and preparedness.

Published
2023
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24. An Optimal Relay Scheme for Outage Minimization in Fog-based Internet-of-Things (IoT) Networks

Author

Omoniwa, Babatunji, Hussain, Riaz, Adil, Muhammad, Shakeel, Atif, Tahir, Ahmed Kamal, Hasan, Qadeer Ul, and Malik, Shahzad A.

Subjects
Computer Science - Networking and Internet Architecture
Abstract

Fog devices are beginning to play a key role in relaying data and services within the Internet-of-Things (IoT) ecosystem. These relays may be static or mobile, with the latter offering a new degree of freedom for performance improvement via careful relay mobility design. Besides that, power conservation has been a prevalent issue in IoT networks with devices being power-constrained, requiring optimal power-control mechanisms. In this paper, we consider a multi-tier fog-based IoT architecture where a mobile/static fog node acts as an amplify and forward relay that transmits received information from a sensor node to a higher hierarchically-placed static fog device, which offers some localized services. The outage probability of the presented scenario was efficiently minimized by jointly optimizing the mobility pattern and the transmit power of the fog relay. A closed-form analytical expression for the outage probability was derived. Furthermore, due to the intractability and non-convexity of the formulated problem, we applied an iterative algorithm based on the steepest descent method to arrive at a desirable objective. Simulations reveal that the outage probability was improved by 62.7% in the optimized-location fixed-power (OLFP) scheme, 79.3% in the optimized-power fixed-location (OPFL) scheme, and 94.2% in the optimized-location optimized-power (OLOP) scheme, as against the fixed-location and fixed-power (FLFP) scheme (i.e., without optimization). Lastly, we present an optimal relay selection strategy that chooses an appropriate relay node from randomly distributed relaying candidates., Comment: Accepted and Published in IEEE Internet of Things Journal

Published
2021

30. Magnetically-induced local lattice anomalies and low-frequency nematic fluctuations in the Mott insulator La$_2$O$_3$Fe$_2$Se$_2$

Author

Hussain, Riaz, Prando, Giacomo, Selter, Sebastian, Aswartham, Saicharan, Büchner, Bernd, and Carretta, Pietro

Subjects
Condensed Matter - Strongly Correlated Electrons, Condensed Matter - Superconductivity
Abstract

We report a study of the Mott insulator La$_2$O$_3$Fe$_2$Se$_2$ by means of $^{139}$La nuclear quadrupole resonance (NQR). The NQR spectra evidence a single La site in the paramagnetic phase and two inequivalent La sites, La1 and La2, in the antiferromagnetically-ordered phase (N\'eel temperature $T_{\rm{N}} \simeq 90$ K). These two sites are characterized by different quadrupole couplings, indicative of distinct lattice and/or charge configurations likely segregated in domains. The dependence of the quadrupole coupling for La2 on temperature suggests that the magnetic order parameter drives the structural distortion. The nuclear spin-lattice and transverse relaxation rates, $1/T_1$ and $1/T_2$, evidence fluctuations in the paramagnetic phase with characteristic frequencies well below the Heisenberg exchange frequency, likely associated with nematic fluctuations., Comment: 6 pages, 4 figures

Published
2020
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37. A comprehensive assessment of phytochemicals from Phyla nodiflora (L.) Greene as a potential enzyme inhibitor, and their biological potential: An in-silico, in-vivo, and in-vitro approach

Author

Alafnan, Ahmed, Nadeem, Muhammad Faisal, Faraz Ahmad, Syed, Sarfraz, Muhammad, Aalamri, Abdulwahab, Khalifa, Nasrin E, Saeed Abdullah, Alasmari, Murtaza, Ali, Danish, Muhammad, Ahmad, Irshad, Hussain, Riaz, Locatelli, Marcello, Khurshid, Umair, Ahemad, Nafees, and Saleem, Hammad

Published
2023
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45. Coherent manipulation of a molecular Ln-based nuclear qudit coupled to an electron qubit

Author

Hussain, Riaz, Allodi, Giuseppe, Chiesa, Alessandro, Garlatti, Elena, Mitcov, Dmitri, Konstantatos, Andreas, Pedersen, Kasper S., De Renzi, Roberto, Piligkos, Stergios, and Carretta, Stefano

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics, Quantum Physics
Abstract

We demonstrate that the [Yb(trensal)] molecule is a prototypical coupled electronic qubit-nuclear qudit system. The combination of noise-resilient nuclear degrees of freedom and large reduction of nutation time induced by electron-nuclear mixing enables coherent manipulation of this qudit by radio-frequency pulses. Moreover, the multi-level structure of the qudit is exploited to encode and operate a qubit with embedded basic quantum error correction.

Published
2019
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