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21.
Study of a Surface Plasmon Resonance Optical Fiber Sensor Based on Periodically Grating and Graphene
Silicon - In this paper an optical fiber sensor based on plasmonic resonance of graphene and periodically grating is designed and investigated. The proposed sensor consists of an optical fiber core... 相似文献
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Hassan Ali Zamani Mohammad Reza Ganjali Parviz Norouzi Azadeh Tadjarodi Encyeh Shahsavani 《Materials science & engineering. C, Materials for biological applications》2008,28(8):1489-1494
A poly (vinyl chloride)-based membrane of N, N-Dimethyl-N′, N″-bis(4-methoxyphenyl)phosphoramidate (DMP) as a neutral carrier was prepared and investigated as a Tb3+-selective electrode. This electrode constructed with sodium tetraphenylborate (NaTPB) as the anion excluder and 2-nitrophenyl octyl ether (NPOE) as the plasticizer. Its performance was found to be the following: a Nernstian slope of 19.7 ± 0.4 mV per decade across a broad range (1.0 × 10− 6 to 1.0 × 10− 1 M); a detection limit of 8.0 × 10− 7 M between the pH values of 3.5 and 8.0; additionally, the response time was about 10 s; usage of more than 2 months without any potential divergence; good Tb3+ selectivity over a wide variety of other metal ions. The membrane sensor was applied to the Tb3+ recovery from different water samples, determination of fluoride ions in mouth wash samples and the determination of Tb3+ in phosphate rock samples. It was also used as an indicator electrode in the potentiometric titration of Tb3+ ions with EDTA. 相似文献
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Mohammad Norouzi Masoud Soleimani Iman Shabani Fatemeh Atyabi Hana H. Ahvaz Abusaeed Rashidi 《Polymer International》2013,62(8):1250-1256
The main purpose of tissue engineering is the preparation of fibrous scaffolds with similar structural and biochemical cues to the extracellular matrix in order to provide a substrate to support the cells. Controlled release of bioactive agents such as growth factors from the fibrous scaffolds improves cell behavior on the scaffolds and accelerates tissue regeneration. In this study, nanofibrous scaffolds were fabricated from biocompatible and biodegradable poly(lactic‐co‐glycolic acid) through the electrospinning technique. Nanofibers with a core–sheath structure encapsulating bovine serum albumin (BSA) as a model protein for hydrophilic bioactive agents were prepared through emulsion electrospinning. The morphology of the nanofibers was evaluated by field‐emission scanning electron microscopy and the core–sheath structure of the emulsion electrospun nanofibers was observed by transmission electron microscopy. The results of the mechanical properties and X‐ray diffraction are reported. The scaffolds demonstrated a sustained release profile of BSA. Biocompatibility of the scaffolds was evaluated using the MTT (3(4,5‐ dimethylthiazol‐2‐yl)‐2,5‐diphenyltetrazolium bromide) assay for NIH‐3T3 fibroblast cells. The results indicated desirable biocompatibility of the scaffolds with the capability of encapsulation and controlled release of the protein, which can serve as tissue engineering scaffolds. © 2013 Society of Chemical Industry 相似文献
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M. Norouzi M. H. Kayhani M. R. H. Nobari F. Talebi 《Theoretical Foundations of Chemical Engineering》2011,45(1):53-67
An exact solution for creeping viscoelastic flow and heat transfer in a curved rectangular duct is presented based on the order of magnitude technique. Here, the Criminale-Eriksen-Filbey model is used as constitutive equation. The closed form of axial velocity, flow rate, flow resistance ratio, pressure distribution, stress field, temperature and Nusselt number are presented, and the effect of aspect ratio, curvature ratio and both of the first and the second normal stress differences on the flow and heat transfer are investigated. One of the noticeable results of current research is confirming the independency of flow resistance and Nusselt number of creeping flow inside the curved duct to curvature ratio at aspect ratio 0.89077. 相似文献
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Mohsen Esmaeili Sepideh Norouzi Kyle George Gelareh Rezvan Nader Taheri-Qazvini Monirosadat Sadati 《Small (Weinheim an der Bergstrasse, Germany)》2023,19(19):2206847
Architected materials with nano/microscale orders can provide superior mechanical properties; however, reproducing such levels of ordering in complex structures has remained challenging. Inspired by Bouligand structures in nature, here, 3D printing of complex geometries with guided long-order radially twisted chiral hierarchy, using cellulose nanocrystals (CNC)-based inks is presented. Detailed rheological measurements, in situ flow analysis, polarized optical microscopy (POM), and director field analysis are employed to evaluate the chiral assembly over the printing process. It is demonstrated that shear flow forces inside the 3D printer's nozzle orient individual CNC particles forming a pseudo-nematic phase that relaxes to uniformly aligned concentric chiral nematic structures after the flow cessation. Acrylamide, a photo-curable monomer, is incorporated to arrest the concentric chiral arrangements within the printed filaments. The time series POM snapshots show that adding the photo-curable monomer at the optimized concentrations does not interfere with chiral self-assemblies and instead increases the chiral relaxation rate. Due to the liquid-like nature of the as-printed inks, optimized Carbopol microgels are used to support printed filaments before photo-polymerization. By paving the path towards developing bio-inspired materials with nanoscale hierarchies in larger-scale printed constructs, this biomimetic approach expands 3D printing materials beyond what has been realized so far. 相似文献
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Mahdi Norouzi Malihe Tahernejad Seyed Ghorban Hosseini Saeed Tavangar 《化学工程与技术》2020,43(11):2215-2223
The sphericity and size of ammonium perchlorate (AP) particles significantly influence the properties of composite propellants. As the AP particles become more spherical, the accumulation coefficient increases, the viscosity during casting decreases, and the particle loading and burning rate increase. Hence, the production of micronized AP particles with an average size between 1 and 20 μm is important to increase the loading percentage of AP in the composite propellant. Here, the Taguchi experimental design was used to optimize the solvent-antisolvent crystallization (SAC) process for the preparation of micronized AP particles with higher sphericity. SAC parameters such as the type of antisolvent, the solvent-to-antisolvent ratio, the antisolvent temperature, the stirring speed, and the retention time were investigated at four levels. The type of antisolvent and the solvent-to-antisolvent ratio were found to mainly contribute to improving the sphericity and size of the AP particles, respectively. 相似文献
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The objective of nuclear fuel management is to minimize the cost of electrical energy generation subject to operational and safety constraints. In the present work, a core reload optimization package using continuous version of particle swarm optimization, CRCPSO, which is a combinatorial and discrete one has been developed and mapped on nuclear fuel loading pattern problems. This code is applicable to all types of PWR cores to optimize loading patterns. To evaluate the system, flattening of power inside a WWER-1000 core is considered as an objective function although other variables such as Keff along power peaking factor, burn up and cycle length can be included. Optimization solutions, which improve the safety aspects of a nuclear reactor, may not lead to economical designs. The system performed well in comparison to the developed loading pattern optimizer using Hopfield along SA and GA. 相似文献
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M.R. Ganjali M. Hosseini A. Ghafarloo M. Khoobi F. Faridbod A. Shafiee P. Norouzi 《Materials science & engineering. C, Materials for biological applications》2013,33(7):4140-4143
(E)-2-(1-(4-hydroxy-2-oxo-2H-chromen-3-yl)ethylidene)hydrazinecarbothioamide (L) has been used to detect trace amounts of praseodymium ion in acetonitrile–water solution (MeCN/H2O) by fluorescence spectroscopy. The fluorescent probe undergoes fluorescent emission intensity enhancement upon binding to Pr3 + ions in MeCN/H2O (9/1:v/v) solution. The fluorescence enhancement of L is attributed to a 1:1 complex formation between L and Pr3 +, which has been utilized as the basis for selective detection of Pr3 +. The sensor can be applied to the quantification of praseodymium ion with a linear range of 1.6 × 10? 7 to 1.0 × 10? 5 M. The limit of detection was 8.3 × 10? 8 M. The sensor exhibits high selectivity toward praseodymium ions in comparison with common metal ions. The proposed fluorescent sensor was successfully used for determination of Pr3 + in water samples. 相似文献
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Strength modeling and optimizing ultrasonic welded parts of ABS-PMMA using artificial intelligence methods 总被引:1,自引:1,他引:0
A. Norouzi M. Hamedi V. R. Adineh 《The International Journal of Advanced Manufacturing Technology》2012,60(1-4):135-147
This study analyzes variations in metal removal rate (MRR) and quality performance of roughness average (R a) and corner deviation (CD) depending on parameters of wire electrical discharge machining (WEDM) process in relation to the cutting of pure tungsten profiles. A hybrid method including response surface methodology (RSM) and back-propagation neural network (BPNN) integrated simulated annealing algorithm (SAA) were proposed to determine an optimal parameter setting. The results of 18 experimental runs via a Taguchi orthogonal table were utilized to train the BPNN to predict the MRR, R a, and CD properties. Simultaneously, RSM and SAA approaches were individually applied to search for an optimal setting. In addition, analysis of variance was implemented to identify significant factors for the processing parameters. Furthermore, the field-emission scanning electron microscope images show that a lot of built-edge layers were presented on the finishing surface after the WEDM process. Finally, the optimized result of BPNN with integrated SAA was compared with that obtained by an RSM approach. Comparisons of the results of the algorithms and confirmation experiments show that both RSM and BPNN/SAA methods are effective tools for the optimization of parameters in WEDM process. 相似文献