Loading...
Search for:
aghamiri--mahan
0.033 seconds
Preparation and Characterization of Silicon Rubber/Hybrid Nano-Particles Based on Silica
, M.Sc. Thesis Sharif University of Technology ; Shojaei, Akbar (Supervisor)
Abstract
In this study, the effect of hydrophobic nanosilica (〖"FNS" 〗_"b" ), hydrophilic nanosilica (〖"FNS" 〗_"l" ), and both the physical (NS&ND) and chemical (NS@ND) hybrids of hydrophilic silica with nanodiamond on the properties of liquid silicone rubber (LSR) was examined. The structural analysis of hydrophilic and hydrophobic nanosilica using FTIR and TGA tests clearly demonstrates the differences between these two particles, with the main difference attributed to the presence of hydroxyl groups in the hydrophilic type. The results obtained from the tensile tests show that using 0.1% by weight of hydrophobic nanosilica and 0.1% by weight of the silica and diamond hybrid improves the mechanical...
Synthesis of Spiro Heterocyclic Compounds by Using Isatin Based 1,3-Dipolar
, M.Sc. Thesis Sharif University of Technology ; Matloubi Moghaddam, Firouz (Supervisor)
Abstract
Today, heterocycle compounds have become increasingly important in organic chemistry syntheses. Many extracellular compounds have a confirmed biological property. Due to the high bioactivity of these compounds, the development of their synthetic methods has received considerable attention and numerous reports have been published on their synthesis. One of the most commonly used examples is terazosin. It was first marketed as a blood pressure lowering drug but was later used in the treatment of benign prostate gland.Another important class of these compounds may be the different derivatives of the pyrimidine molecule used in the treatment of cancer. The use of hetero- cyclic compounds is not...
Prediction of the kinematic viscosity of crude oil fractions
, Article Petroleum Science and Technology ; Volume 28, Issue 6 , 2010 , Pages 646-653 ; 10916466 (ISSN) ; Nozarpour, A ; Aghamiri, S. F ; Sharif University of Technology
2010
Abstract
A generalized equation based on modified Eyring's theory for predicting kinematic viscosity of petroleum fractions is proposed in this work. The equation uses two reference fluids including a pair of (C6 and C10), (C10 and C14), or (C14 and C20) for petroleum fractions of molecular weight higher than 70 and lower than 300. Validity and accuracy of this equation have been confirmed by comparing the obtained results of this equation with experimental data. In contrast to other correlations that require so many specific parameters for oil viscosity prediction, this type of equation requires only molecular weight and true boiling point. The results obtained in this work are in agreement with...
A diastereo and chemo selective synthesis of 6-amino-4-aryl-3-oxo-2,3,3a,4-tetrahydro-1H-pyrazolo[3,4-b]pyridine-5-carbonitrile under environmentally benevolent conditions
, Article Journal of Molecular Structure ; Volume 1257 , 2022 ; 00222860 (ISSN) ; Eslami, M ; Aghamiri, B ; Sharif University of Technology
Elsevier B.V
2022
Abstract
We have developed an environmentally friendly benign and practical protocol for the highly diastereo and chemo selective synthesis of some novel derivatives of 6-amino-4-aryl-3-oxo-2,3,3a,4-tetrahydro-1H-pyrazolo[3,4-b]pyridine-5-carbonitrile via a one-pot three-component reaction between arylaldehydes, malononitrile and 3-amino-1H-pyrazol-5(4H)-one in the presence of acetic acid as a catalyst and aqueous green medium at the ambient temperature. In this synthetic protocol, we highlight the utility of enaminone functional groups of 3-amino-1H-pyrazol-5(4H)-one for the synthesis of N-cyclized pyrazolone fused 3,4-dihydropyridine skeletons. Some important features of this new synthetic green...
Facile one-pot, domino reaction to synthesize (Z)-2-imino-5-(1-alkyl-2-oxoindolin-3-ylidene)thiazolidin-4-one derivatives and its DFT study for the E/Z confirmation structure
, Article Synthetic Communications ; Volume 53, Issue 14 , 2023 , Pages 1153-1163 ; 00397911 (ISSN) ; Kavoosi, L ; Aghamiri, B ; Sharif University of Technology
Taylor and Francis Ltd
2023
Abstract
In this publication, we reported an eco-friendly procedure for the efficient synthesis of 2-imino-5-(1-alkyl-2-oxoindolin-3-ylidene) thiazolidin-4-one derivatives with a stereospecific coupling reaction between 2-imino-thiazolidin-4-one (pseudothiohydantoin) and cyano-substituted oxindole derivatives. Thus, a variety of new thiazolidin-oxindole derivatives with potential medicinal applications have been synthesized with an effective and economical method, focusing on sustainable chemistry. The final products have been obtained in excellent yields together with high purity after washing with water and ethanol. This publication is the first easy protocol to be reported for the rapid...
Developing a framework for analyzing the causes of corruption
, Article Journal of Optimization in Industrial Engineering ; Volume 15, Issue 1 , 2022 , Pages 67-77 ; 22519904 (ISSN) ; Sepehri, M ; Aghamiri, S. M. A ; Sharif University of Technology
Qazvin Islamic Azad University
2022
Abstract
In this paper, a framework for effective factors on the occurrence of economic corruption is presented. Corruption issues as an existing challenge need to be addressed comprehensively and accurately. Various factors affect this issue, and the lack of precise and comprehensive identification of these factors can create a constraint, in which the main causes of corruption may not be addressed and efforts may focus on less important issues. The existence of a framework of factors helps by examining the level of these factors and makes it possible to identify the strengths and weaknesses of context and personal factors to design and implement corrective solutions and eliminating weaknesses, so...
Command Increasing in SSVEP based BCI Using Color
, M.Sc. Thesis Sharif University of Technology ; Shamsollahi, Mohamad Bagher (Supervisor)
Abstract
Nowadays, a brain-computer interface (BCI) systems is considered as one of the necessary needs for individuals who are capable of doing their daily tasks. Despite of recent technological developments, such systems are not widely utilized. Spelling vocabularies and controlling wheelchairs are the most useful examples of using BCI. Todays, there has been a wide range of methods for establishing the connection between mind and computer. One of these methods is brain -Computer Interface Applications based on Steady State Visual Evoked Potentials (SSVEP). Although, these applications has a capability of fast responds and data transitions, only a few tasks can be given to the computer. In this...
High catalytic performance of CoCuFe2O4/ZIF-8(Zn) nanocatalyst for synthesis of new benzimidazole derivatives
, Article Journal of Molecular Structure ; Volume 1285 , 2023 ; 00222860 (ISSN) ; Jarahiyan, A ; Heidarian Haris, M ; Yaqubnezhad Pazoki, P ; Aghamiri, B ; Sharif University of Technology
Elsevier B.V
2023
Abstract
Herein, we reported an efficient catalytic system for the rapid construction of benzimidazole, benzimidazole-quinoline, benzothiazole, and benzoxazole derivatives by a reaction between arylaldehydes, and ortho-phenylenediamine (2-aminothiophenol, 2-aminophenol) under green conditions. Magnetic CoCuFe2O4/ZIF-8(Zn) was synthesized by a simple and facile procedure with the aid of cetyltrimethylammonium bromide (CTAB) to bind CoCuFe2O4 and ZIF-8(Zn). Different techniques such as Fourier transmission infrared spectroscopy (FT-IR), X-ray diffraction (XRD), Field emission scanning electron microscopy (FESEM), and Transmission electron microscopy (TEM) were used to characterize the catalyst...