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More on neutrosophic Lie subalgebra
S. Jafari,S. R. Vidhya,N. Rajesh,A. Pigazzini 원광대학교 기초자연과학연구소 2024 ANNALS OF FUZZY MATHEMATICS AND INFORMATICS Vol.27 No.2
In this paper, we present some more fundamental properties of the notion of neutrosophic Lie subalgebra of a Lie algebra.
REMARKS ON THE INNER POWER OF GRAPHS
JAFARI, S.,ASHRAFI, A.R.,FATH-TABAR, G.H.,TAVAKOLI, Mostafa The Korean Society for Computational and Applied M 2017 Journal of applied mathematics & informatics Vol.35 No.1
Let G be a graph and k is a positive integer. Hammack and Livesay in [The inner power of a graph, Ars Math. Contemp., 3 (2010), no. 2, 193-199] introduced a new graph operation $G^{(k)}$, called the $k^{th}$ inner power of G. In this paper, it is proved that if G is bipartite then $G^{(2)}$ has exactly three components such that one of them is bipartite and two others are isomorphic. As a consequence the edge frustration index of $G^{(2)}$ is computed based on the same values as for the original graph G. We also compute the first and second Zagreb indices and coindices of $G^{(2)}$.
REMARKS ON THE INNER POWER OF GRAPHS
S. JAFARI,A.R. ASHRAFI,G.H. FATH-TABAR,M. TAVAKOLI 한국전산응용수학회 2017 Journal of applied mathematics & informatics Vol.35 No.1
Let G be a graph and k is a positive integer. Hammack and Livesay in [The inner power of a graph, Ars Math. Contemp., 3 (2010), no. 2, 193{199] introduced a new graph operation G(k), called the kth inner power of G. In this paper, it is proved that if G is bipartite then G(2) has exactly three components such that one of them is bipartite and two others are isomorphic. As a consequence the edge frustration index of G(2) is computed based on the same values as for the original graph G. We also compute the rst and second Zagreb indices and coindices of G(2).
Double fuzzy rarely continuous functions
S. Jafari,M. R. Farahani,M. Vanishree,N. Rajesh 원광대학교 기초자연과학연구소 2023 ANNALS OF FUZZY MATHEMATICS AND INFORMATICS Vol.26 No.1
In this paper, we define fuzzy rare set, fuzzy dense set and fuzzy rarely continuous functions in double fuzzy topological spaces. We will explore several interesting properties and characterizations of these newly defined notions.
Free vibration analysis of functionally graded coupled circular plate with piezoelectric layers
S. Jafari Mehrabadi,M. H. Kargarnovin,M. M. Najafizadeh 대한기계학회 2009 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.23 No.8
Based on classical plate theory (CLPT), free vibration analysis of a circular plate composed of functionally graded material (FGM) with its upper and lower surfaces bounded by two piezoelectric layers was performed. Assuming that the material properties vary in a power law manner within the thickness of the plate the governing differential equations are derived. The distribution of electric potential along the thickness direction in piezoelectric layers is considered to vary quadratically such that the Maxwell static electricity equation is satisfied. Then these equations are solved analytically for two different boundary conditions, namely clamped and simply supported edges. The validity of our analytical solution was checked by comparing the obtained resonant frequencies with those of an isotropic host plate. Furthermore, for both FGM plate and FGM plate with piezoelectric layers, natural frequencies were obtained by finite element method. Very good agreement was observed between the results of finite element method and the method presented in this paper. Then for the two aforementioned types of boundary conditions, the values of power index were changed and its effect on the resonant frequencies was studied. Also, the effect of piezoelectric thickness layers on the natural frequencies of FGM piezoelectric plate was investigated.
Study effects of conventional flotation reagents on bioleaching of zinc sulfide
M. Jafari,S. Chehreh Chelgani,S.Z. Shafaie,H. Abdollahi,E. Hadavandi 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.78 No.-
Althoughflotation and bio-extraction of metals from its products are extensively investigated, there arefew studied which evaluated the effects of reagents on bioleaching process. Both structure andconcentration offlotation reagents are effective factors on microorganism activities. In this study,Kendall’s tau (t) as a statistical method was used to statistically access the effect of typical sulfideflotation surfactants (collectors: potassium amyl-xanthate, potassium isobutyl-xanthate, sodium ethyl-xanthate, potassium isopropyl-xanthate, and Dithiophosphate), and frothers: pine oil and methylisobutyl carbinol) on the bioleaching of Zn sulfides in a mixed culture (Leptospirillum ferrooxidans,Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans). To consider both structure andconcentration of these reagents, their molarities were used for the statistical evaluations. The Kendallassessments indicated that by increasing in the molarity of reagents, the pH value (the most effectivefactors of bioleaching) was increased (t: 0.56) while the ORP value (t:0.54), Fe3þFe2þ ratio (t:0.51) andnumbers of oxidizing bacteria (t:0.38) in the solution were decreased. Therefore, as a result of thesemulti-interactions, by increasing the molarity of reagents, Zn recovery was decreased (t:0.45). Theseresults potentially can be used for selection offlotation reagents when bioleaching would be themetallurgical metal extraction method.
Mousavi, S. Behnam,Amir, Saeed,Jafari, Akbar,Arshid, Ehsan Techno-Press 2021 Advances in nano research Vol.10 No.3
In the current study, the free vibrational behavior of a Porous Micro (PM) beam which is integrated with Functionally Graded Piezoelectric (FGP) layers with initial curvature is considered based on the two trigonometric shear deformation theories namely SSDBT and Tan-SDBT. The structure's mechanical properties are varied through its thicknesses following the given functions. The curved microbeam is exposed to electro-mechanical preload and also is rested on a Pasternak type of elastic foundation. Hamilton's principle is used to extract the motion equations and the MCST is used to capture the size effect. Navier's solution method is selected as an analytical method to solve the motion equations for a simply supported ends case and by validating the results for a simpler state with previously published works, effects of different important parameters on the behavior of the structure are considered. It is found that although increasing the porosity reduces the natural frequency, but enhancing the volume fraction of CNTs increasing it. Also, by increasing the central angle of the curved beam the vibrations of the structure increases. Designing and manufacturing more efficient smart structures such as sensors and actuators are of the aims of this study.
Sebastian S Zeki,Ismail Miah,Pierfrancesco Visaggi,Anna Wolak,Minerva deSilva,Jason M Dunn,Andrew Davies,James Gossage,Abrie Botha,Guiping Sui,Jafar Jafari,Terry Wong 대한소화기 기능성질환∙운동학회 2023 Journal of Neurogastroenterology and Motility (JNM Vol.29 No.3
Background/AimsExtended wireless pH monitoring (WPM) is used to investigate gastroesophageal reflux disease (GERD) as subsequent or alternative investigation to 24-hour catheter-based studies. However, false negative catheter studies may occur in patients with intermittent reflux or due to catheter-induced discomfort or altered behavior. We aim to investigate the diagnostic yield of WPM after a negative 24-hour multichannel intraluminal impedance pH (MII-pH) monitoring study and to determine predictors of GERD on WPM given a negative MII-pH. MethodsConsecutive adult patients (> 18 years) who underwent WPM for further investigation of suspected GERD following a negative 24-hour MII-pH and upper endoscopy between January 2010 and December 2019 were retrospectively included. Clinical data, endoscopy, MII-pH, and WPM results were retrieved. Fisher’s exact test, Wilcoxon rank sum test, or Student’s t test were used to compare data. Logistic regression analysis was used to investigate predictors of positive WMP. ResultsOne hundred and eighty-one consecutive patients underwent WPM following a negative MII-pH study. On average and worst day analysis, 33.7% (61/181) and 34.2% (62/181) of the patients negative for GERD on MII-pH were given a diagnosis of GERD following WPM, respectively. On a stepwise multiple logistic regression analysis, the basal respiratory minimum pressure of the lower esophageal sphincter was a significant predictor of GERD with OR = 0.95 (0.90-1.00, P = 0.041). ConclusionsWPM increases GERD diagnostic yield in patients with a negative MII-pH selected for further testing based on clinical suspicion. Further studies are needed to assess the role of WPM as a first line investigation in patients with GERD symptoms.