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Dynamic simulation of a solar ejector-based trigeneration system using TRNSYS-EES co-simulator
, Article Energy Science and Engineering ; Volume 10, Issue 3 , 2022 , Pages 707-725 ; 20500505 (ISSN) ; Jafari Mosleh, H ; Karami, M ; Sharif University of Technology
John Wiley and Sons Ltd
2022
Abstract
In this paper, a new configuration of a solar combined cooling, heating, and power (CCHP) system is proposed to recover the waste thermal energy of a steam power plant, which provides the cooling and heating needs of an apartment complex located in Tehran. The required energy of the system is supplied by the parabolic trough solar collectors (PTCs) and, if necessary, an auxiliary heater is also used. An ejector refrigeration cycle (ERC) and a steam Rankine cycle are used for cooling and power generation, respectively. The cycle is dynamically modeled over a year using a TRNSYS-EES co-simulator. It is found that the highest Rankine cycle efficiency is obtained in the cold months (January)...
A brief survey on pure cohen–macaulayness in a fixed codimension
, Article Acta Mathematica Vietnamica ; Volume 47, Issue 1 , 2022 , Pages 181-196 ; 02514184 (ISSN) ; Poursoltani, M ; Terai, N ; Yassemi, S ; Sharif University of Technology
Springer
2022
Abstract
A concept of Cohen–Macaulay in codimension t is defined and characterized for arbitrary finitely generated modules and coherent sheaves by Miller, Novik, and Swartz in 2011. Soon after, Haghighi, Yassemi, and Zaare-Nahandi defined and studied CMt simplicial complexes, which is the pure version of the abovementioned concept and naturally generalizes both Cohen–Macaulay and Buchsbaum properties. The purpose of this paper is to survey briefly recent results of CMt simplicial complexes. © 2021, Institute of Mathematics, Vietnam Academy of Science and Technology (VAST) and Springer Nature Singapore Pte Ltd
On the well-posedness, equivalency, and low-complexity translation techniques of discrete-time hybrid automaton and piecewise affine systems
, Article Scientia Iranica ; Volume 29, Issue 2 D , 2022 , Pages 693-726 ; 10263098 (ISSN) ; Mokhtari, H ; Sharif University of Technology
Sharif University of Technology
2022
Abstract
The main contribution of this paper is to present the systematic and low-complexity translation techniques between a class of hybrid systems referred to as automaton-based Discrete-time Hybrid Automata (DHA) and piecewise affine (PWA) systems. As a starting point, the general modeling framework of the automaton-based DHA is represented, which models the controlled and uncontrolled switching phenomena between linear continuous dynamics including discrete and continuous states, inputs and outputs. The basic theoretical definitions on the state trajectories of the proposed DHA with forward and backward evolutions that yield forward and backward piecewise affine (FPWA and BPWA) systems are...
Catalytic reduction of nitroarenes and Suzuki-Miyaura reactions using Pd complex stabilized on the functionalized polymeric support
, Article Chemical Physics Letters ; Volume 793 , 2022 ; 00092614 (ISSN) ; Pourmorteza, N ; Yousefi, A ; Esperi, M ; Sharif University of Technology
Elsevier B.V
2022
Abstract
The significance of aromatic amines as crude substances in diverse applications has attracted extensive consideration in the field of economic procedures for the reduction of nitroarenes. Also, the formation of Carbon–Carbon bond as a dominant step in the structure of complex molecules is an important phenomenon in chemical reactions. Improvements of eco-friendly methodologies for reduction process and Carbon–Carbon bond formation have been noticeable. The present work represents through a capable heterogeneous Pd catalyst, the reduction of nitroarenes to the corresponding amines in the presence of N2H4 as a weak hydrogen donor reagent in the room temperature and solvent-free condition was...
Histidine-enhanced gene delivery systems: The state of the art
, Article Journal of Gene Medicine ; Volume 24, Issue 5 , 2022 ; 1099498X (ISSN) ; Jahanpeimay Sabet, M ; Hasanzadeh, A ; Kamrani Mousavi, S. M ; Haeri Moghaddam, N ; Hooshmand, S. A ; Rabiee, N ; Liu, Y ; Hamblin, M. R ; Karimi, M ; Sharif University of Technology
John Wiley and Sons Inc
2022
Abstract
Gene therapy has emerged as a promising tool for treating different intractable diseases, particularly cancer or even viral diseases such as COVID-19 (coronavirus disease 2019). In this context, various non-viral gene carriers are being explored to transfer DNA or RNA sequences into target cells. Here, we review the applications of the naturally occurring amino acid histidine in the delivery of nucleic acids into cells. The biocompatibility of histidine-enhanced gene delivery systems has encouraged their wider use in gene therapy. Histidine-based gene carriers can involve the modification of peptides, dendrimers, lipids or nanocomposites. Several linear polymers, such as polyethylenimine,...
Towards high data-rate diffusive molecular communications: A review on performance enhancement strategies
, Article Digital Signal Processing: A Review Journal ; Volume 124 , 2022 ; 10512004 (ISSN) ; Nasiri Kenari, M ; Mitra, U ; Sharif University of Technology
Elsevier Inc
2022
Abstract
Diffusive molecular communications (DiMC) have recently gained attention as a candidate for nano- to micro- and macro-scale communications due to its simplicity and energy efficiency. As signal propagation is solely enabled by Brownian motion mechanics, DiMC faces severe inter-symbol interference (ISI), which limits reliable and high data-rate communications. Herein, recent literature on DiMC performance enhancement strategies is surveyed; key research directions are identified. Signaling design and associated design constraints are presented. Studies on fundamental information theoretic limits of DiMC channel are reviewed. Classical and novel transceiver designs are discussed with an...
A glimpse to most of the old and new results on very well-covered graphs from the viewpoint of commutative algebra
, Article Research in Mathematical Sciences ; Volume 9, Issue 2 , 2022 ; 25220144 (ISSN) ; Pournaki, M. R ; Seyed Fakhari, S. A ; Terai, N ; Yassemi, S ; Sharif University of Technology
Springer Science and Business Media Deutschland GmbH
2022
Abstract
A very well-covered graph is a well-covered graph without isolated vertices such that the height of its edge ideal is half of the number of vertices. In this survey article, we gather together most of the old and new results on the edge and cover ideals of these graphs. © 2022, The Author(s), under exclusive licence to Springer Nature Switzerland AG
Developing a multi-objective multi-layer model for optimal design of residential complex energy systems
, Article International Journal of Electrical Power and Energy Systems ; Volume 138 , 2022 ; 01420615 (ISSN) ; Jooshaki, M ; Moeini Aghtaie, M ; Hossein Barmayoon, M ; Aien, M ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
Optimal planning of residential complex energy systems requires thorough mathematical modelling to address the interconnections between all the energy installations from the largest ones, shared by all the residents, to the smallest ones in each distinct unit. Besides, conflicting desires of investors and residents in various aspects such as reliability index make this problem more challenging. In response, this paper presents a thorough framework to obtain the optimum design and operation of a residential complex energy system from scratch. To address the appropriate interconnection between various components of such an energy system, a multi-layer energy hub structure is proposed. Besides,...
3D hand pose estimation using RGBD images and hybrid deep learning networks
, Article Visual Computer ; Volume 38, Issue 6 , 2022 , Pages 2023-2032 ; 01782789 (ISSN) ; Seyedarabi, H ; Mozaffari Tazehkand, B ; Kasaei, S ; Sharif University of Technology
Springer Science and Business Media Deutschland GmbH
2022
Abstract
Hand pose estimation is one of the most attractive research areas for image processing. Among the human body parts, hands are particularly important for human–machine interactions. The advent of commercial depth cameras along with the rapid growth of deep learning has made great progress in all image processing fields, especially in hand pose estimation. In this study, using depth data, we introduce two hybrid deep neural networks to estimate 3D hand poses with fewer computations and higher accuracy compared with their counterparts. Due to the fact that the dimensions of data are reduced while passing through successive layers of networks, which causes data to be lost, we use the concept of...
Galloping in fast-growth natural merge sorts
, Article 49th EATCS International Conference on Automata, Languages, and Programming, ICALP 2022, 4 July 2022 through 8 July 2022 ; Volume 229 , 2022 ; 18688969 (ISSN); 9783959772358 (ISBN) ; Jugé, V ; Khalighinejad, G ; CNRS; Inria; Nomadic Lab; Universite Paris Cite ; Sharif University of Technology
Schloss Dagstuhl- Leibniz-Zentrum fur Informatik GmbH, Dagstuhl Publishing
2022
Abstract
We study the impact of sub-array merging routines on merge-based sorting algorithms. More precisely, we focus on the galloping sub-routine that TimSort uses to merge monotonic (non-decreasing) sub-arrays, hereafter called runs, and on the impact on the number of element comparisons performed if one uses this sub-routine instead of a naive merging routine. The efficiency of TimSort and of similar sorting algorithms has often been explained by using the notion of runs and the associated run-length entropy. Here, we focus on the related notion of dual runs, which was introduced in the 1990s, and the associated dual run-length entropy. We prove, for this complexity measure, results that are...
Parameterized complexity of list coloring and Max coloring
, Article 17th International Computer Science Symposium in Russia, CSR 2022, 29 June 2022 through 1 July 2022 ; Volume 13296 LNCS , 2022 , Pages 46-63 ; 03029743 (ISSN); 9783031095733 (ISBN) ; Panolan, F ; Sharif University of Technology
Springer Science and Business Media Deutschland GmbH
2022
Abstract
In the List Coloring problem, the input is a graph G and list of colors L: V(G) → N for each vertex v∈ V(G). The objective is to test the existence of a coloring λ: V(G) → N such that for each v∈ V(G), λ(v) ∈ L(v) and for each edge (u, v) ∈ E(G), λ(u) ≠ λ(v). Fiala et al. (TCS 2011) proved that List Coloring is W[1]-hard when parameterized by the vertex cover number of the input graph. Recently, Gutin et al. (STACS 2020, SIDMA 2021) designed an O∗(2 k) time randomized algorithm for List Coloring where k is the size of the given clique modulator of the input graph. Since List Coloring is W[1]-hard parameterized by the vertex cover number, List Coloring is W[1]-hard parameterized by the size...
A note on monomial ideals which are Cohen–Macaulay in a fixed codimension
, Article Communications in Algebra ; Volume 50, Issue 11 , 2022 , Pages 4988-4996 ; 00927872 (ISSN) ; Shibata, K ; Terai, N ; Yassemi, S ; Sharif University of Technology
Taylor and Francis Ltd
2022
Abstract
In this note, we introduce and investigate the notion of (Formula presented.) monomial ideals. We give an explicit relation of the (Formula presented.) property to a monomial ideal and its polarization. Further, we characterize the (Formula presented.) property of the ordinary as well as the symbolic third or more powers of squarefree monomial ideals. © 2022 Taylor & Francis Group, LLC
Waves in linear time-varying dielectric media
, Article 16th European Conference on Antennas and Propagation, EuCAP 2022, 27 March 2022 through 1 April 2022 ; 2022 ; 9788831299046 (ISBN) ; Mirmoosa, M. S ; Tretyakov, S. A ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2022
Abstract
In this paper, focusing on the frequency domain, we write the constitutive relation and the Helmholtz equation for linear, dispersive, and inhomogeneous time-varying media. Next, by assuming spatial homogeneity, we simplify the equations and explain how to calculate dispersion curves (the angular frequency with respect to the wave vector) for propagating waves. Furthermore, we show that under the simplifying assumption of instantaneous response, the developed general approach provides the same dispersion curves as reported earlier for the dispersion-less model of time-varying dielectric media. We believe that this study is important for investigations of wave phenomena in time-varying media,...
A Review on chemical sand production control techniques in oil reservoirs
, Article Energy and Fuels ; 2022 ; 08870624 (ISSN) ; Baghban Salehi, M ; Hosseinzadehsemnani, R ; Moghanloo, R. G ; Taghikhani, V ; Sharif University of Technology
American Chemical Society
2022
Abstract
This review aims to bring together the studies on petroleum reservoirs' sand production control in a comprehensive guide for the researcher to compare various methods for the chemical consolidation of sand. Sand production can be considered one of the major challenges in the petroleum production industry, causing severe operational issues. This study introduces various methods to control and prevent sand production in petroleum wells and evaluates their advantages and performance in tabular form. The use of chemical procedures is considered to be more efficient in counteracting the production and migration of sand. Various chemicals and polymers have been proposed for this purpose. These...
Ferric metformin drug complex supported on magnetic nanofiber cellulose; An efficient access to 4-H pyrans derivatives and determination of their antimicrobial activity
, Article Synthetic Communications ; Volume 52, Issue 7 , 2022 , Pages 974-993 ; 00397911 (ISSN) ; Daneshfar, M ; Moghimi, H ; Daneshfar, Z ; Sharif University of Technology
Taylor and Francis Ltd
2022
Abstract
Magnetic nanofiber cellulose (NFC) was selected as a biopolymer surface for the reaction with ferric metformin and a novel nanocatalyst was prepared. This green heterogeneous organometallic catalyst was analyzed by physiochemical techniques. The new metformin drug complex supported on magnetic NFC was used as a powerful and efficient catalyst for the synthesis of functionalized 4H-pyrans derivatives. The antimicrobial activity of the products showed excellent activity against all the bacterial and fungal strains (especially compounds 7q and 6r). © 2022 Taylor & Francis Group, LLC
Dynamics of antimicrobial peptide encapsulation in carbon nanotubes: the role of hydroxylation
, Article International Journal of Nanomedicine ; Volume 17 , 2022 , Pages 125-136 ; 11769114 (ISSN) ; Yousefi, F ; Seidi, F ; Sajadi, S. M ; Rabiee, N ; Habibzadeh, S ; Esmaeili, A ; Mashhadzadeh, A. H ; Spitas, C ; Mostafavi, E ; Saeb, M. R ; Sharif University of Technology
Dove Medical Press Ltd
2022
Abstract
Introduction: Carbon nanotubes (CNTs) have been widely employed as biomolecule carriers, but there is a need for further functionalization to broaden their therapeutic application in aqueous environments. A few reports have unraveled biomolecule–CNT interactions as a measure of response of the nanocarrier to drug-encapsulation dynamics. Methods: Herein, the dynamics of encapsulation of the antimicrobial peptide HA-FD-13 (accession code 2L24) into CNTs and hydroxylated CNTs (HCNTs) is discussed. Results: The van der Waals (vdW) interaction energy of CNT–peptide and HCNT–peptide complexes decreased, reaching −110.6 and −176.8 kcal.Mol−1, respectively, once encapsulation of the peptide inside...
Full Nesterov-Todd step feasible interior-point algorithm for symmetric cone horizontal linear complementarity problem based on a positive-asymptotic barrier function
, Article Optimization Methods and Software ; Volume 37, Issue 1 , 2022 , Pages 192-213 ; 10556788 (ISSN) ; Mahdavi Amiri, N ; Darvay, Z ; Rigó, P.R ; Sharif University of Technology
Taylor and Francis Ltd
2022
Abstract
We present a feasible full step interior-point algorithm to solve the (Formula presented.) horizontal linear complementarity problem defined on a Cartesian product of symmetric cones, which is not based on a usual barrier function. The full steps are scaled utilizing the Nesterov-Todd (NT) scaling point. Our approach generates the search directions leading to the full-NT steps by algebraically transforming the centring equation of the system which defines the central trajectory using the induced barrier of a so-called positive-asymptotic kernel function. We establish the global convergence as well as a local quadratic rate of convergence of our proposed method. Finally, we demonstrate that...
A new reliability-based task scheduling algorithm in cloud computing
, Article International Journal of Communication Systems ; Volume 35, Issue 3 , 2022 ; 10745351 (ISSN) ; Movaghar, A ; Rahmani, A. M ; Sharif University of Technology
John Wiley and Sons Ltd
2022
Abstract
In the last decade, the scale of heterogeneous computing (HC) systems such as heterogeneous cloud computing environments was growing like never before. So network failures are unavoidable in such systems, which affect system reliability. Since the task scheduling algorithm in HC is challenging, we investigate a new reliability-aware task scheduling algorithm (RATSA) in this paper. RATSA is designed to schedule tasks on directed acyclic graphs (DAGs) by using the shuffled frog-leaping algorithm (SFLA) and genetic algorithm (GA) as evolutionary algorithms. The population-based SFLA-GA is applied to optimize makespan in the RATSA as an NP-complete problem. Moreover, the proposed algorithm...
Synthesis and characterization of 1-amidino-O-alkylureas metal complexes as α- glucosidase Inhibitors: Structure-activity relationship, molecular docking, and kinetic studies
, Article Journal of Molecular Structure ; Volume 1250 , 2022 ; 00222860 (ISSN) ; Daneshfar, M ; Daneshfar, Z ; Iraji, A ; Samandari Najafabad, A ; Faramarzi, M. A ; Mahdavi, M ; Sharif University of Technology
Elsevier B.V
2022
Abstract
In the present study, metal complexes of 1-amidino-O-alkylureas were designed, synthesized and characterized by elemental analyses, FT-IR spectra, XRD, Mass analyses and scanning electron microscopy (SEM). All synthesized complexes were screen as α-Glucosidase inhibitors. According to the in vitro results, the Cu (II) complexes showed superior potency compared to other tested metal complexes. Particularly, [Cu(L-Me)2](Cl)2 (1b) showed the strongest inhibition against α-Glucosidase with an IC50 value of 2.75 ± 0.3 µM which was comparable to that of acarbose (IC50 = 750 µM). These findings are supported by the ligands and enzyme interactions through molecular docking. © 2021 Elsevier B.V
ZrN fractal-graphene-based metamaterial absorber in the visible and near-IR regimes
, Article Optik ; Volume 237 , 2021 ; 00304026 (ISSN) ; Choudhury, P. K ; Niaz Akhtar, M ; Sharif University of Technology
Elsevier GmbH
2021
Abstract
The absorption characteristics of zirconium nitride (ZrN)-based metamaterial absorber of fractal geometry are studied. The proposed absorber is comprised of fractal metasurface at the top having subwavelength-sized periodic pattern of specially designed ZrN circular nano-discs arranged over silicon dioxide (SiO2) substrate. A tri-layer graphene, owing to its exhibiting better tunability, is introduced at the interface of metasurface and substrate. The bottom side of SiO2 is coated with silver nanolayer to block transmission. The absorptivity essentially depends on the kind of fractal design used in metasurface to configure the absorber. The obtained results exhibit the absorption...