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The nonlinear diffusion bandwidth: A simple tool for optimizing dispersion maps
, Article Optical Transmission, Switching, and Subsystems IV, Gwangju, 5 September 2006 through 7 September 2006 ; Volume 6353 I , 2006 ; 0277786X (ISSN) ; 0819464481 (ISBN); 9780819464484 (ISBN) ; Fischer, J. K ; Louchet, H ; Jamshidi, K ; Petermann, K ; Sharif University of Technology
2006
Abstract
The concept of a nonlinear transfer function of a fibre-optic communication link is reviewed. Also an approximation of the nonlinear transfer function is introduced, which allows to define an equivalent single-span model of a dispersion-managed multi-span system. In this paper we will show its limits of validity and try to extent these limits by enhancing the theoretical model. In this respect we will discuss the impact of dispersion precompensation and show the influence of residual dispersion per span, number of spans and local dispersion on transmission systems with on-off keying and differential phase-shift keying modulation formats. This approach allows fast assessment of the...
Message from the greenCom 2019 general and program chairs
, Article 12th IEEE International Conference on Internet of Things, 15th IEEE International Conference on Green Computing and Communications, 12th IEEE International Conference on Cyber, Physical and Social Computing and 5th IEEE International Conference on Smart Data, iThings/GreenCom/CPSCom/SmartData 2019, 14 July 2019 through 17 July 2019 ; 2019 , Pages xliv-xlv ; 9781728129808 (ISBN) ; Nallanathan, A ; Zhu, D ; Ejlali, A ; Ashok, A ; Luo, C ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2019
Design and control of a self-powered hybrid electromagnetic damper
, Article Journal of Sound and Vibration ; Volume 428 , 2018 , Pages 147-167 ; 0022460X (ISSN) ; Chang, C. C ; Bakhshi, A ; Sharif University of Technology
Academic Press
2018
Abstract
In this paper, the characteristics of a hybrid regenerative electromagnetic (EM) damper are first determined and experimentally examined. The main idea is to have two modes of operation for the EM damper, namely passive energy harvesting and semi-active modes. In the passive mode, the vibrational energy of an underlying structure is harvested and stored in a rechargeable battery. The harvested energy can then be employed in the semi-active control mode to supply the power demand for the required sensors and microcontroller. This hybrid damper would thus be capable of realizing the characteristics of a self-powered EM damper. A prototype of the damper was designed and tested under different...
All metal organic deposited high-Tc superconducting transition edge bolometer on yttria-stabilized zirconia substrate
, Article Journal of Superconductivity and Novel Magnetism ; 2016 , Pages 1-6 ; 15571939 (ISSN) ; Opata, Y. A ; Wulff, A. C ; Grivel, J. C ; Fardmanesh, M ; Sharif University of Technology
Springer New York LLC
2016
Abstract
We report on the results of a YBa2Cu3O7−x (YBCO) superconductive transition edge bolometer (TEB) fabricated on a Ce0.9La0.1O2−7 (CLO) buffered single crystalline yttria-stabilized zirconia (YSZ) substrate. Metal organic deposition was used for the fabrication of both the YBCO thin film as well as CLO buffer layer, while standard photolithography was applied for TEB preparation. YBCO thin film properties were analysed using scanning electron microscopy (SEM), X-ray diffraction (XRD), AC susceptibility and resistance versus temperature measurements. Optical response of the TEB in terms of voltage amplitude and phase was analysed and measured through four-probe technique in a liquid nitrogen...
Phosphorus transport in intensively managed watersheds
, Article Water Resources Research ; Volume 55, Issue 11 , 2019 , Pages 9148-9172 ; 00431397 (ISSN) ; Boardman, E ; Danesh Yazdi, M ; Finlay, J. C ; Hansen, A. T ; Baker, A. C ; Dalzell, B ; Sharif University of Technology]
Blackwell Publishing Ltd
2019
Abstract
Understanding controls of P movement through watersheds are essential for improved landscape management in intensively managed regions. Here, we analyze observational data from 104 gaged river sites and 176 nongaged river sites within agriculturally dominated watersheds of Minnesota, USA, to understand the role of landscape features, land use practices, climate variability, and biogeochemical processes in total, dissolved and particulate P dynamics at daily to annual scales. Our analyses demonstrate that factors mediating P concentration-discharge relationships varied greatly across watersheds and included near-channel sediment sources, lake and wetland interception, assimilation by algal P,...
Topological code autotune
, Article Physical Review X ; Volume 2, Issue 4 , October , 2012 ; 21603308 (ISSN) ; Whiteside, A. C ; McInnes, A. L ; Rabbani, A ; Sharif University of Technology
2012
Abstract
Many quantum systems are being investigated in the hope of building a large-scale quantum computer. All of these systems suffer from decoherence, resulting in errors during the execution of quantum gates. Quantum error correction enables reliable quantum computation given unreliable hardware. Unoptimized topological quantum error correction (TQEC), while still effective, performs very suboptimally, especially at low error rates. Hand optimizing the classical processing associated with a TQEC scheme for a specific system to achieve better error tolerance can be extremely laborious. We describe a tool, AUTOTUNE, capable of performing this optimization automatically, and give two highly...
Investigation of CeO2 buffer layer effects on the voltage response of YBCO transition-edge bolometers
, Article IEEE Transactions on Applied Superconductivity ; Volume 26, Issue 3 , 2016 ; 10518223 (ISSN) ; Nazifi, R ; Wulff, A. C ; Vesaghi, M. A ; Grivel, J. C ; Fardmanesh, M ; Sharif University of Technology
2016
Abstract
The effect on the thermal parameters of superconducting transition-edge bolometers produced on a single crystalline SrTiO3 (STO) substrate with and without a CeO2 buffer layer was investigated. Metal-organic deposition was used to deposit the 20-nm CeO2 buffer layer, whereas RF magnetron sputtering was applied to fabricate 150-nm-thick superconducting YBa2Cu3O7-δ (YBCO) thin film. The critical transition temperature for both of the YBCO films was 90 K, and the transition width was ∼1.9 K. The bolometers fabricated from these samples were characterized with respect to the voltage phase and amplitude responses, and the results were compared with that of simulations conducted by applying a...
Optimal quantum error correcting codes from absolutely maximally entangled states
, Article Journal of Physics A: Mathematical and Theoretical ; Volume 51, Issue 7 , 2018 ; 17518113 (ISSN) ; Gogolin, C ; Riera, A ; Acin, A ; Sharif University of Technology
Institute of Physics Publishing
2018
Abstract
Absolutely maximally entangled (AME) states are pure multi-partite generalizations of the bipartite maximally entangled states with the property that all reduced states of at most half the system size are in the maximally mixed state. AME states are of interest for multipartite teleportation and quantum secret sharing and have recently found new applications in the context of high-energy physics in toy models realizing the AdS/CFT-correspondence. We work out in detail the connection between AME states of minimal support and classical maximum distance separable (MDS) error correcting codes and, in particular, provide explicit closed form expressions for AME states of n parties with local...
Multi-porous Co3O4 nanoflakes @ sponge-like few-layer partially reduced graphene oxide hybrids: towards highly stable asymmetric supercapacitors
, Article Journal of Materials Chemistry A ; Volume 5, Issue 24 , 2017 , Pages 12569-12577 ; 20507488 (ISSN) ; Chou, T. C ; Lee, Y. H ; Samireddi, S ; Naseri, N ; Ganguly, A ; Esfandiar, A ; Wang, C. H ; Chen, L. C ; Chen, K. H ; Moshfegh, A. Z ; Sharif University of Technology
2017
Abstract
The controlled growth of metal oxide nanostructures within hierarchically porous conductive carbon-based frameworks is critically important to achieving high volumetric performance and appropriate channel size for energy storage applications. Herein, we grow cobalt oxide (Co3O4) nanoflakes, using a sequential-electrodeposition process, into spherically porous sponge-like few-layer partially reduced graphene oxide (SrGO) synthesized by template-directed ordered assembly. Maximum specific/volumetric capacitances of 1112 F gCo3O4-1 (at 3.3 A gCo3O4-1), 178 F cm-3 (at 2.6 A cm-2), and 406 F gtotal-1 (at 1 A gtotal-1) and sensible rate capability (80% retention by increasing the charge/discharge...
Effects of contaminants on the mass-transfer characteristics of a two-impinging-streams gas-liquid reactor
, Article Chemical Engineering and Technology ; Volume 34, Issue 11 , 2011 , Pages 1797-1806 ; 09307516 (ISSN) ; Savari, C ; Sharif University of Technology
2011
Abstract
The mass-transfer characteristics of a new type of two-impinging-streams reactor (TISR) was studied by means of sodium sulfite solution as the liquid phase and air as the gas phase, in the presence and absence of various types of surface-active agents (SAAs). The influences of anionic, cationic, and nonionic SAAs on the specific interfacial area and overall volumetric mass-transfer coefficient obtained in the TISR were investigated. It was found that the presence of a little amount of the above-mentioned contaminants increases the specific interfacial area and decreases the overall volumetric mass-transfer coefficient. On the basis of the experimental results obtained for various types of...
Analytical model of the effect of tangent length between vertical curves on train derailments
, Article Application of Nanotechnology in Pavements, Geological Disasters, and Foundation Settlement Control Technology ; 2014 , Pages 40-45 ; Khodabakhshi, A ; Aman, J. J. C ; Sharif University of Technology
2014
Abstract
Derailment is one of the most hazardous occurrences affecting the safety of railroad cars that must be prevented. The potential threat of derailment could be especially significant when length of tangent between vertical curves isn't long enough. Although the length of tangent between vertical curves could be relevant to railway safety, no research had been conducted to study its effect on derailment risk. The primary objective of this paper was to investigate the effect of tangent length between vertical curves on derailment. This study consisted of three major components: (1) review of 1999-2008 derailment reports in Iran, (2) a regression analysis, and (3) recommendation model for...
On hypercontractivity and the mutual information between Boolean functions
, Article 2013 51st Annual Allerton Conference on Communication, Control, and Computing, Allerton 2013, Monticello, IL ; Oct , 2013 , Pages 13-19 ; 9781479934096 (ISBN) ; Gohari, A. A ; Kamath, S ; Nair, C ; Sharif University of Technology
IEEE Computer Society
2013
Abstract
Hypercontractivity has had many successful applications in mathematics, physics, and theoretical computer science. In this work we use recently established properties of the hypercontractivity ribbon of a pair of random variables to study a recent conjecture regarding the mutual information between binary functions of the individual marginal sequences of a sequence of pairs of random variables drawn from a doubly symmetric binary source
Integrated image processing and computational techniques to characterize formation damage
, Article SPE International Conference and Exhibition on Formation Damage Control 2018, 7 February 2018 through 9 February 2018 ; Volume 2018-February , 2018 ; Rabbani, A ; Salehi, S ; Ghalambor, A ; Sharif University of Technology
Society of Petroleum Engineers (SPE)
2018
Abstract
Filtrate and solid invasion from drilling fluids are two key sources of formation damage, and can result in formation permeability impairment. Typically, spurt invasion of mud solids causes the evolution of an external mud cake which tends to reduce further solids and filtrate influx. However, uncontrolled spurt and filtrate invasion are detrimental because they reduce the permeability of the formation. Mud composition, formation rock's permeability and porosity, and temperature can influence both spurt and filtrate invasion. The sizes of mud solids relative to the average pore size of a rock are also important in predicting the extent of mud invasion and permeability impairment. In this...
Comments on "Identification of a nonlinear electromagnetic system: An experimental study"
, Article Journal of Sound and Vibration ; Volume 290, Issue 3-5 , 2006 , Pages 1333-1334 ; 0022460X (ISSN) ; Salarieh, H ; Alasty, A ; Chang, S. C ; Tung, P. C ; Sharif University of Technology
Academic Press
2006
A vacuum-re lled tensiometer for deep monitoring of in-situ pore water pressure
, Article Scientia Iranica ; Volume 27, Issue 2 , 2021 , Pages 596-606 ; 10263098 (ISSN) ; Chiu, A. C. F ; Ng, C. W. W ; Jafarzadeh, F ; Sharif University of Technology
Sharif University of Technology
2021
Abstract
Real-time measurement of soil water pressure has been recognized as an essential part of investigating water ow in unsaturated soils. Tensiometry, amongst di erent measuring techniques, is a common method for direct evaluation of water pressure. However, the lower limit of measurable water pressure by a conventional tensiometer becomes even more limited by increasing its length in the vertical installation. This paper describes the development of a Vacuum-Re lled Tensiometer (VRT) for monitoring soil water pressure independent of installation depth. This is achieved by xing the distance between pressure sensor and ceramic cup together with incorporating an ancillary vacuum-re lling assembly...
A vacuum-refilled tensiometer for deep monitoring of in-situ pore water pressure
, Article Scientia Iranica ; Volume 27, Issue 2A , 2021 , Pages 596-606 ; 10263098 (ISSN) ; Chiu, A. C. F ; Ng, C. W. W ; Jafarzadeh, F ; Sharif University of Technology
Sharif University of Technology
2021
Abstract
Real-time measurement of soil water pressure has been recognized as an essential part of investigating water ow in unsaturated soils. Tensiometry, amongst different measuring techniques, is a common method for direct evaluation of water pressure. However, the lower limit of measurable water pressure by a conventional tensiometer becomes even more limited by increasing its length in the vertical installation. This paper describes the development of a Vacuum-Refilled Tensiometer (VRT) for monitoring soil water pressure independent of installation depth. This is achieved by fixing the distance between pressure sensor and ceramic cup together with incorporating an ancillary vacuumre filling...
The wet precipitation process of hydroxyapatite
, Article Materials Letters ; Volume 57, Issue 24-25 , 2003 , Pages 4064-4069 ; 0167577X (ISSN) ; Afshar, A ; Ghorbani, M ; Ehsani, N ; Sorrell, C. C ; Sharif University of Technology
2003
Abstract
Stoichiometric hydroxyapatite (HA) powder was synthesized by wet method using orthophosphoric acid and calcium hydroxide, as raw materials. In this regard, the time-depending changes of the precipitated particles and effects of heating on them were investigated. The as-precipitated and heated powder samples were examined using field emission electron microscopy (FESEM), XRD and Raman spectroscopy methods. The results revealed that the morphology and size of the precipitated particles change in each stage of the process. After drying, these nanoparticles tend to form small agglomerates. © 2003 Elsevier Science B.V. All rights reserved
Mapping dispersion fluctuations along optical fibers using brillouin probing and a fast analytic calculation
, Article 2013 Conference on Lasers and Electro-Optics, CLEO ; 2013 ; 9781557529725 (ISBN) ; Vedadi, A ; Denisov, A ; Soto, M. A ; Mehrany, K ; Bres, C. S ; Thevenaz, L
2013
Abstract
A simple analytic formula is derived to extract tiny dispersion fluctuations along highly nonlinear fibers from distributed measurements of parametric gain. A refined BOTDA scheme, suitable to track Kerr processes, enables low noise measurements
Observation of micro-macro entanglement of light
, Article Nature Physics ; Volume 9, Issue 9 , July , 2013 , Pages 541-544 ; 17452473 (ISSN) ; Ghobadi, R ; Chandra, A ; Prasad, A. S ; Simon, C ; Sharif University of Technology
2013
Abstract
Schrödinger's famous thought experiment involves a (macroscopic) cat whose quantum state becomes entangled with that of a (microscopic) decaying nucleus. The creation of such micro-macro entanglement is being pursued in several fields, including atomic ensembles, superconducting circuits, electro-mechanical and opto-mechanical systems. Here we experimentally demonstrate the micro-macro entanglement of light. The macro system involves over a hundred million photons, whereas the micro system is at the single-photon level. We show that microscopic quantum fluctuations (in field quadrature measurements) on one side are correlated with macroscopic fluctuations (in the photon number statistics) on...
Improved cardinality bounds on the auxiliary random variables in Marton's inner bound
, Article IEEE International Symposium on Information Theory - Proceedings ; 2013 , Pages 1272-1276 ; ISSN: 21578095 ; ISBN: 9781479904464 ; Gohari, A ; Nair, C ; Sharif University of Technology
2013
Abstract
Marton's region is the best known inner bound for a general discrete memoryless broadcast channel. We establish improved bounds on the cardinalities of the auxiliary random variables. We combine the perturbation technique along with a representation using concave envelopes to achieve this improvement. As a corollary of this result, we show that a randomized time division strategy achieves the entire Marton's region for binary input broadcast channels, extending the previously known result for the sum-rate and validating a previous conjecture due to the same authors