A comprehensive architecture platform for smarter universities

, Article 2023 28th International Computer Conference, Computer Society of Iran, CSICC 2023 ; 2023 ; 979-835033819-5 (ISBN) Saberi Varzaneh, A ; Merikhi, B ; Saberi Varzaneh, M ; Alam Varzaneh Isfahani, M. H ; Habibi Kalahroodi, H ; Fatemipour Sharabiany, M ; Sharif University of Technology

Institute of Electrical and Electronics Engineers Inc 2023

Abstract

One of the most crucial infrastructure requirements of integrated systems is designing and providing a comprehensive architecture for implementation, support and improvement of their smart services or platforms. And without exception, smart University would also require a responsive architecture for the integration and consolidation of its current and future systems and services. Providing higher level of academic services, integration and consolidation support, and cost accounting (including 'cloud storage', 'computing', 'network communication and bandwidth' and energy consumption) can be placed as pivotal issues among smart university services. In this article, a basic definition of a...

Three-dimensional Ising model, percolation theory and conformal invariance

, Article EPL ; Volume 92, Issue 6 , 2010 ; 02955075 (ISSN) Saberi, A. A ; Dashti Naserabadi, H ; Sharif University of Technology

2010

Abstract

The fractal structure and scaling properties of a 2d slice of the 3d Ising model is studied using Monte Carlo techniques. The percolation transition of geometric spin (GS) clusters is found to occur at the Curie point, reflecting the critical behavior of the 3d model. The fractal dimension and the winding angle statistics of the perimeter and external perimeter of the geometric spin clusters at the critical point suggest that, if conformally invariant in the scaling limit, they can be described by the theory of Schramm-Löwner evolution (SLE κ) with diffusivity of κ=5 and 16/5, respectively, putting them in the same universality class as the interfaces in 2d tricritical Ising model. It is...

A new protocol for asymmetric communication channels: Reaching the lower bounds

, Article Scientia Iranica ; Volume 8, Issue 4 , 2001 , Pages 297-302 ; 10263098 (ISSN) Ghazizadeh, S ; Ghodsi, M ; Saberi, A ; Sharif University of Technology

Sharif University of Technology 2001

Abstract

In this paper, the problem of sending n-bit of data from a client to a server using an asymmetric communication channel is discussed where the line bandwidth from server to client is much higher than that of client to server. The goal is to provide a protocol for this problem so that the average number of actual bits sent by client to server becomes as low as possible. Assuming that data is drawn from an arbitrary distribution D, the average number of bits sent by client to server cannot be less than H(D), where H(D) is the binary entropy of D. This problem was first considered by Adler and Maggs [1]. They assumed that the distribution of D is known only by the server and introduced a...

Conformal curves on the WO3 surface

, Article Physical Review Letters ; Volume 100, Issue 4 , 2008 ; 00319007 (ISSN) Saberi, A. A ; Rajabpour, M. A ; Rouhani, S ; Sharif University of Technology

2008

Abstract

We have studied the isoheight lines on the WO3 surface as a physical candidate for conformally invariant curves. We have shown that these lines are conformally invariant with the same statistics of domain walls in the critical Ising model. They belong to the family of conformal invariant curves called Schramm-Loewner evolution (or SLEκ), with diffusivity of κ∼3. This can be regarded as the first experimental observation of SLE curves. We have also argued that Ballistic Deposition (BD) can serve as a growth model giving rise to contours with similar statistics at large scales. © 2008 The American Physical Society

Some aspects of c = -2 theory

, Article Fortschritte der Physik ; Volume 55, Issue 11-12 , 2007 , Pages 1289-1308 ; 00158208 (ISSN) Rajabpour, M. A ; Rouhani, S ; Saberi, A. A ; Sharif University of Technology

2007

Abstract

We investigate some aspects of the c = -2 logarithmic conformal field theory (LCFT). At first, we calculate some correlators of logarithmic conformal fields which have third order singular OPE with the energymomentum tensor. Then, we argue about the fields in the c = -2 model which are associated with this kind of more general logarithmic primary fields. We go on to find fermionic representations for all the fields in the extended Kac table, in particular the untwisted sector. Moreover, we calculate the various OPEs of the fields, especially for the logarithmic energy-momentum tensor and by using these OPEs we find the exact finite transformation of this field. We briefly discuss about the...

Correction to: Oseledets Splitting and Invariant Manifolds on Fields of Banach Spaces (Journal of Dynamics and Differential Equations, (2021), 10.1007/s10884-021-09969-1)

, Article Journal of Dynamics and Differential Equations ; 2021 ; 10407294 (ISSN) Ghani Varzaneh, M ; Riedel, S ; Sharif University of Technology

Springer 2021

Abstract

The original version of this article unfortunately contained a typo in co-author name. The author name is “Mazyar Ghani Varzaneh” instead it was published incorrectly as “M. Mazyar Ghani Varzaneh”. © 2021, Springer Science+Business Media, LLC, part of Springer Nature

Oseledets splitting and invariant manifolds on fields of banach spaces

, Article Journal of Dynamics and Differential Equations ; Volume 35, Issue 1 , 2023 , Pages 103-133 ; 10407294 (ISSN) Ghani Varzaneh, M ; Riedel, S ; Sharif University of Technology

Springer 2023

Abstract

We prove a semi-invertible Oseledets theorem for cocycles acting on measurable fields of Banach spaces, i.e. we only assume invertibility of the base, not of the operator. As an application, we prove an invariant manifold theorem for nonlinear cocycles acting on measurable fields of Banach spaces. © 2021, The Author(s)

Correction to: Oseledets splitting and invariant manifolds on fields of banach spaces (journal of dynamics and differential equations, (2023), 35, 1, (103-133), 10.1007/s10884-021-09969-1)

, Article Journal of Dynamics and Differential Equations ; Volume 35, Issue 1 , 2023 , Pages 983- ; 10407294 (ISSN) Ghani Varzaneh, M ; Riedel, S ; Sharif University of Technology

Springer 2023

Abstract

Unified modeling and experimental realization of electrical and thermal percolation in polymer composites

, Article Applied Physics Reviews ; Volume 9, Issue 4 , 2022 ; 19319401 (ISSN) Sarikhani, N ; Arabshahi, Z. S ; Saberi, A. A ; Moshfegh, A. Z ; Sharif University of Technology

American Institute of Physics Inc 2022

Abstract

Correlations between electrical and thermal conduction in polymer composites are blurred due to the complex contribution of charge and heat carriers at the nanoscale junctions of filler particles. Conflicting reports on the lack or existence of thermal percolation in polymer composites have made it the subject of great controversy for decades. Here, we develop a generalized percolation framework that describes both electrical and thermal conductivity within a remarkably wide range of filler-to-matrix conductivity ratios (Y f / Y m), covering 20 orders of magnitude. Our unified theory provides a genuine classification of electrical conductivity with typical Y f / Y m ≥ 10 10 as...

Oseledets splitting and invariant manifolds on fields of banach spaces

, Article Journal of Dynamics and Differential Equations ; 2021 ; 10407294 (ISSN) Ghani Varzaneh, M. M ; Riedel, S ; Sharif University of Technology

Springer 2021

Abstract

We prove a semi-invertible Oseledets theorem for cocycles acting on measurable fields of Banach spaces, i.e. we only assume invertibility of the base, not of the operator. As an application, we prove an invariant manifold theorem for nonlinear cocycles acting on measurable fields of Banach spaces. © 2021, The Author(s)

Classification of (2+1 ) -dimensional growing surfaces using Schramm-Loewner evolution

, Article Physical Review E - Statistical, Nonlinear, and Soft Matter Physics ; Volume 82, Issue 2 , August , 2010 ; 15393755 (ISSN) Saberi, A. A ; Dashti Naserabadi, H ; Rouhani, S ; Sharif University of Technology

2010

Abstract

Statistical behavior and scaling properties of isoheight lines in three different saturated two-dimensional grown surfaces with controversial universality classes are investigated using ideas from Schramm-Loewner evolution (SLEκ). We present some evidence that the isoheight lines in the ballistic deposition (BD), Eden and restricted solid-on-solid (RSOS) models have conformally invariant properties all in the same universality class as the self-avoiding random walk (SAW), equivalently SLE8/3. This leads to the conclusion that all these discrete growth models fall into the same universality class as the Kardar-Parisi-Zhang (KPZ) equation in two dimensions

A hybrid simulation-adaptive network based fuzzy inference system for improvement of electricity consumption estimation

, Article Expert Systems with Applications ; Volume 36, Issue 8 , 2009 , Pages 11108-11117 ; 09574174 (ISSN) Azadeh, A ; Saberi, M ; Gitiforouz, A ; Saberi, Z ; Sharif University of Technology

2009

Abstract

This paper presents a hybrid adaptive network based fuzzy inference system (ANFIS), computer simulation and time series algorithm to estimate and predict electricity consumption estimation. The difficulty with electricity consumption estimation modeling approach such as time series is the reason for proposing the hybrid approach of this study. The algorithm is ideal for uncertain, ambiguous and complex estimation and forecasting. Computer simulation is developed to generate random variables for monthly electricity consumption. Various structures of ANFIS are examined and the preferred model is selected for estimation by the proposed algorithm. Finally, the preferred ANFIS and time series...

The most optimal barrier height of InGaN light-emitting diodes

, Article Applied Physics A: Materials Science and Processing ; Volume 127, Issue 2 , 2021 ; 09478396 (ISSN) Alam Varzaneh Isfahani, M. H ; Faez, R ; Sharif University of Technology

Springer Science and Business Media Deutschland GmbH 2021

Abstract

In this paper, a novel structure is presented in order to decrease the polarization charges of quantum wells. The main purpose of this design is to make electron and hole wavefunctions closer to each other and to increase overlap integral following an increase of radiative recombination rates and internal quantum efficiency. Furthermore, carriers will be increased and become more balanced and identical which leads to an increase in efficiency of light-emitting diodes. The improvement of radiative recombination rates is studied in new structures. Energy bands diagram, carriers density, current density–voltage, and power density–current density are used to demonstrate the superior performance...

The most optimal barrier height of InGaN light-emitting diodes

, Article Applied Physics A: Materials Science and Processing ; Volume 127, Issue 2 , 2021 ; 09478396 (ISSN) Alam Varzaneh Isfahani, M. H ; Faez, R ; Sharif University of Technology

Springer Science and Business Media Deutschland GmbH 2021

Abstract

In this paper, a novel structure is presented in order to decrease the polarization charges of quantum wells. The main purpose of this design is to make electron and hole wavefunctions closer to each other and to increase overlap integral following an increase of radiative recombination rates and internal quantum efficiency. Furthermore, carriers will be increased and become more balanced and identical which leads to an increase in efficiency of light-emitting diodes. The improvement of radiative recombination rates is studied in new structures. Energy bands diagram, carriers density, current density–voltage, and power density–current density are used to demonstrate the superior performance...

A dynamical theory for singular stochastic delay differential equations i: linear equations and a multiplicative ergodic theorem on fields of banach spaces

, Article SIAM Journal on Applied Dynamical Systems ; Volume 21, Issue 1 , 2022 , Pages 542-587 ; 15360040 (ISSN) Ghani Varzaneh, M ; Riedel, S ; Scheutzow, M ; Sharif University of Technology

Society for Industrial and Applied Mathematics Publications 2022

Abstract

We investigate singular stochastic delay differential equations (SDDEs) in view of their long-time behavior. Using Lyons's rough path theory, we show that SDDEs can be solved pathwise and induce a continuous stochastic flow on the space of (Gubinelli's) controlled paths. In the language of random dynamical systems, this result shows that SDDEs induce a continuous cocycle on random fibers, or, more precisely, on a measurable field of Banach spaces. We furthermore prove a multiplicative ergodic theorem (MET) on measurable fields of Banach spaces that applies under significantly weaker structural and measurability assumptions than preceding METs. Applying it to linear SDDEs shows that the...

An Introduction to Langlands Program

, M.Sc. Thesis Sharif University of Technology Hatami Varzaneh, Omid (Author) ; Pournaki, Mohammadreza (Supervisor)

Abstract

The Weil group WF is assigne to every local field F. Langlands Correspondence is a bijetion between semisimple two-dimensional Deligne representations of Weil Group WF and irreducible representations of GL2(F) which fixes assigned L-functions and local constants. In this thesis we have classified an important class of irreducible representations of GL(2) over local fields called Principal Series. We also tried to give a taste of Langlands Correspondence to the reader. First we explain preliminaries and introduce locally profinite groups and their smooth representations. Then we classify representations of GL2(F) when F is finite. Then we study GL2(F) when F is a local field. Finally we...

Simulation and Implementation of Active Energy Management Algorithm on Residential Photovoltaic System with Storage

, M.Sc. Thesis Sharif University of Technology Ghafouri Varzaneh, Saeed (Author) ; Abbaspour, Ali (Supervisor)

Abstract

In majority of the (standalone or grid-connected) PV Systems, predefined rule-based algorithms are utilized in order to manage and control the flow of power. The function of these algorithms is to send the generated energy from solar panels either to load for consumption, or to battery for storage, or to the grid for sale. Their performance is based on predefined instructions and regardless of load change and consumption patterns. Therefore the total efficiency of these systems depend greately upon individual user’s load type and consumption pattern. In current research, an optimum and dynamic energy management algorithm is proposed using dynamic programming (DP) method, in order to increase...

Effect of landmark configuration on target registration error for vertebra: A phantom study

, Article Proceedings of SPIE - The International Society for Optical Engineering ; Volume 8671 , 2013 ; 0277786X (ISSN) ; 9780819494450 (ISBN) Ershad, M ; Ahmadian, A ; Seraj, N. D ; Saberi, H ; Khoiy, K. A ; Sharif University of Technology

2013

Abstract

The configuration of landmarks is an important issue in minimizing the target registration error (TRE). In this paper the effect of different landmark configurations on the accuracy of pedicle screw placement during image guided spine surgery (IGSS) is investigated. Since the spine is deformed in intra-operative conditions compared to the preoperative situation, an accurate alignment of each vertebra is crucial to compensate for the deformation. CT compatible markers are placed over anatomical landmarks which are feasible and routinely used in surgical procedures. The TRE is obtained directly for the markers which are placed on the right and left pedicle of the vertebra. The estimated TRE...

Experimental investigation on thermal conductivity of water based nickel ferrite nanofluids

, Article Advanced Powder Technology ; Volume 26, Issue 6 , November , 2015 , Pages 1529-1536 ; 09218831 (ISSN) Karimi, A ; Sadatlu, M. A. A ; Saberi, B ; Shariatmadar, H ; Ashjaee, M ; Sharif University of Technology

Elsevier 2015

Abstract

Experimental investigations are performed in order to determine the thermal conductivity of NiFe2O4 nanoparticles dispersed in deionized water. The magnetic nanoparticles are synthesized using a microemulsion method. The X-ray diffraction (XRD), transmission electronic microscopy (TEM), and vibration sample magnetometer (VSM) are used to characterize the structure, the size and the magnetic properties of the nanoparticles. The VSM results disclose that the NiFe2O4 nanoparticles are ferromagnetic at room temperature. Experimental measurements on thermal conductivity of the prepared nanofluids are conducted at different volume concentrations between 0% and 2% and in the temperature range of...

Part load behavior of molten salt cavity receiver solar tower plants under storage mode operational mode

, Article ASME 2016 10th International Conference on Energy Sustainability, ES 2016, collocated with the ASME 2016 Power Conference and the ASME 2016 14th International Conference on Fuel Cell Science, Engineering and Technology, 26 June 2016 through 30 June 2016 ; Volume 1 , 2016 ; 9780791850220 (ISBN) Mostafavi Tehrani, S. S ; Shafiei Ghazani, A ; Taylor, R. A ; Saberi, P ; Sharif University of Technology

American Society of Mechanical Engineers 2016

Abstract

The performance of the tower based concentrated solar thermal (CST-tower) plant is very sensitive to the operation strategy of the plant and the incident heat flux on the receiver. To date, most studies have been examined only the design mode characteristics of the cavity receivers, but this paper significantly expands the literature by considering non-design operating conditions of this important sub-component of the CST-tower plants. A feasible non-design operating conditions of the cavity receivers that was considered in this study is the storage mode of operation. Two practical dynamic control strategies were examined then to find the most efficient approach: fixed solar field mass...