Iranian Journal of Science and Technology, Transactions A: Science

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Electrochemical Study of Spark Plasma-Sintered Copper Reinforced with Ni/SiC Micron-Sized Particles for Electrical Applications
Iranian Journal of Science and Technology, Transactions A: Science - Tập 43 - Trang 457-464 - 2017
K. Machethe, A. P. I. Popoola, V. S. Aigbodion, O. M. Popoola
In the research study, incorporation of Cu with hard SiC and Ni micron-sized particles was applied in the fabrication of a multifunctional copper-based metal matrix composite using spark plasma sintering. The developed spark plasma-sintered Cu–xNi and Cu–xNi–xSiC composite charateristics were studied by conducting morphological analysis, electrochemical, microhardness, and densification tests. Ana...... hiện toàn bộ
Degradation of Poly(3-(Oxiran-2-ylmethyl) Oxazolidin-2-one) in the Presence of an Algerian Activated Clay
Iranian Journal of Science and Technology, Transactions A: Science - Tập 43 - Trang 1545-1550 - 2018
Soraya Seghier, Mohammed Belbachir
The degradation of poly(3-(oxiran-2-ylmethyl) oxazolidin-2-one) (poly(OMO)) has been studied. The reactions were carried out in the presence of an Algerian montmorillonite sheet silicate clay exchanged with protons called Maghnite-H+. First, the effect of solvent and reaction time on the conversion of monomer and the molecular weight are investigated in the polymerization of 3-(oxiran-2-ylmethyl) ...... hiện toàn bộ
Physical Aspects of MHD Nonlinear Radiative Heat Flux in Flow of Thixotropic Nanomaterial
Iranian Journal of Science and Technology, Transactions A: Science - Tập 43 - Trang 2043-2054 - 2019
Tasawar Hayat, Madiha Rashid, M. Ijaz Khan, Ahmed Alsaedi
Here magnetohydrodynamic nanomaterial flow of thixotropic fluid is addressed. Electrically conducting fluid is considered. Stagnation-point flow toward variable thicked surface is addressed. Soret and Dufour effects are retained. Formulation is based on Brownian and thermophoresis diffusions. In addition, nonlinear thermal heat flux and convective boundary conditions are also taken into account. T...... hiện toàn bộ
Peristaltic Transport of MHD Walters B Fluid Through Porous Medium with Heat Transfer
Iranian Journal of Science and Technology, Transactions A: Science - Tập 41 - Trang 489-504 - 2017
K. Ramesh, M. Devakar
This paper is devoted to the study of the peristaltic flow of a magnetohydrodynamic Walters B fluid through porous medium in a vertical asymmetric channel with heat transfer. The flow is investigated in the wave frame of reference moving with constant velocity with the wave. The non-linear governing partial differential equations are solved using perturbation technique by taking wave number as a s...... hiện toàn bộ
Total Restrained Geodetic Number of Graphs
Iranian Journal of Science and Technology, Transactions A: Science - Tập 41 - Trang 473-480 - 2017
Hossein Abdollahzadeh Ahangar, Maryam Najimi
A geodetic set S in a graph G is called a total restrained geodetic set if the induced subgraphs G[S] and $$G[V-S]$$ have no isolated vertex. The minimum cardinality of a total restrained geodetic set in G is the total restrained geodetic number ...... hiện toàn bộ
A Novel Parametric Deformable Model Based on Calculus of Variations for QRS Detection
Iranian Journal of Science and Technology, Transactions A: Science - Tập 43 - Trang 1101-1107 - 2018
Mahdi Saadatmand-Tarzjan, Niloofar Rashidi, Mozafar Iqbal
In this paper, a novel single-dimensional parametric deformable model based on calculus of variations is proposed for automatic QRS detection in electrocardiogram (ECG) signal. It is inspired by the active contours, conventionally used for image segmentation. Primarily, the Shannon envelop of the ECG signal is obtained by a preprocessing algorithm. The proposed parametric deformable model includes...... hiện toàn bộ
Uniformly Convergent Numerical Method for Singularly Perturbed Time Delay Parabolic Problem with Two Small Parameters
Iranian Journal of Science and Technology, Transactions A: Science - Tập 43 - Trang 2373-2383 - 2019
L. Govindarao, Subal Ranjan Sahu, Jugal Mohapatra
This article discusses the numerical solution of one dimensional parabolic convection-reaction-diffusion time delay problem with two small parameters. For the discretization of the time derivative, we use the implicit Euler scheme on a uniform mesh and for the spatial discretization, we use the upwind difference scheme on the Shishkin type meshes (standard Shishkin mesh, Bakhvalov–Shishkin mesh). ...... hiện toàn bộ
Some Cohomological Notions in Banach Algebras Based on Maximal Ideal Space
Iranian Journal of Science and Technology, Transactions A: Science - - 2022
Amir Sahami, Mohammad Rostami
Discrimination of HIV-1 and HIV-2 Reverse Transcriptase Proteins Using Chou’s PseAAC
Iranian Journal of Science and Technology, Transactions A: Science - Tập 42 - Trang 1805-1811 - 2017
Mandana Behbahani, Hassan Mohabatkar, Mokhtar Nosrati
Reverse transcriptase (RT) is an important enzyme for retrovirus replication in susceptible target cells. RT of HIV-1 is one of the key targets for anti-HIV drugs. In contrast, HIV-2 RT reveals a basic resistance to non-nucleoside RT inhibitors (NNRTIs). In the present study, a comparison of different aspects of RT proteins in HIV-1 and HIV-2 such as pseudo amino acid composition (PseAAC), convent...... hiện toàn bộ
On First-Order Conditions for Optimality of Nondifferentiable Semi-infinite Programming
Iranian Journal of Science and Technology, Transactions A: Science - Tập 43 - Trang 1643-1647 - 2018
Ali Sadeghieh
The purpose of this paper is to give some new Karush–Kuhn–Tucker-type necessary optimality conditions for nonsmooth semi-infinite problems. Moreover, we present some suitable examples for our results. The paper is organized by Fréchet and Mordukhovich subdifferentials.
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