oalib

OALib Journal期刊

ISSN: 2333-9721

费用:99美元

投稿

时间不限

2017 ( 22 )

2016 ( 29 )

2015 ( 196 )

2014 ( 424 )

自定义范围…

匹配条件: “ Sara Jahromi” ,找到相关结果约5773条。
列表显示的所有文章,均可免费获取
第1页/共5773条
每页显示
On the Study of Magneto-Hydrodynamic Non-Newtonian Fluid Flow throughout Curvilinear Channel with Corrugated Walls  [PDF]
Seyed Ali Madani Tonekaboni, Hamid Reza Gharahi, Mohammad Hossein Motevaselian, Seyed Fouad Karimian, Sara Jahromi
Open Journal of Modelling and Simulation (OJMSi) , 2014, DOI: 10.4236/ojmsi.2014.24014
Abstract: This article aims to numerically investigate the flow pattern for Newtonian and power law non-Newtonian fluid in a semi-half circular channel with corrugated walls under the influence of a magnetic field. The results indicate that, presence of a magnetic field affects the flow field in several aspects, especially in the vortex creation and dissipation. In addition, the analysis is carried out for different Reynolds numbers to ascertain the influence of magnetic field on each flow regime. Eventually, the analysis is carried out for a range of power indices including pseudo plastic (shear-thinning) to dilatants (shear-thickening) fluids. The results show that by increasing the power-index, the vortices begin to form and grow gradually so that in the shear-thickening fluid an extra vortex is formed and created nearby the corrugated part of the channel.
Failure Rate of First Arterio-Venous Fistula in a Developing Country
Jahromi Alireza
Saudi Journal of Kidney Diseases and Transplantation , 2008,
Abstract:
Guide Wire J-Tip Technique for Easy Exchange of In Situ Endotracheal Tubes
Hamid Reza Eftekharian Jahromi
Iranian Journal of Medical Sciences , 2012,
Abstract:
Expletives in Modern Persian
Abolfazl MOSAFFA JAHROMI
Acta Linguistica Asiatica , 2011,
Abstract: It has generally been argued that Persian does not include dummy elements called expletives, in spite of the existence of the morpheme ǐn which shows the behavior of an expletive in specific constructions. The morpheme is not a part of the argument structure and has no meaning. In Persian, which is a pro-drop language, the morpheme ǐn as expletive is generated only in [SPEC CP] of an independent clause. This element may occur in a subject position, object position, or as an object of a preposition. In subject and object positions it is optional when S′ moves to the end of the sentence, or is adjoined to it, in other cases it is obligatory. As an object of a preposition it is always obligatory, no matter whether the structure is the result of a movement or not. The aim of this article is to provide evidence in favor of the existence of expletives, and their projection in Persian.
Predicting numerically the large increases in extra pressure drop when boger fluids flow through  [PDF]
H. R. Tamaddon-Jahromi, M. F. Webster, K. Walters
Natural Science (NS) , 2010, DOI: 10.4236/ns.2010.21001
Abstract: Recent numerical studies on pressure-drops in contraction flows have introduced a variety of constitutive models to compare and contrast the competing influences of extensional vis-cosity, normal stress and shear-thinning. Early work on pressure-drops employed the constant viscosity Oldroyd-B and Upper Convected Max- well (UCM) models to represent the behavior of so-called Boger fluids in axisymmetric contrac-tion flows, in (unsuccessful) attempts to predict the very large enhancements that were ob-served experimentally. In more recent studies, other constitutive models have been employed to interpret observed behavior and some pro-gress has been made, although finding a (re-spectable) model to describe observed contrac-tion-flow behavior, even qualitatively, has been frustratingly difficult. With this in mind, the present study discusses the ability of a well- known FENE type model (the so-called FENE- CR model) to describe observed behavior. For various reasons, an axisymmetric (4:1:4) con-traction/expansion geometry, with rounded corners, is singled out for special attention, and a new hybrid finite element/volume algo-rithm is utilized to conduct the modeling, which reflects an incremental pressure-correction time-stepping structure. New to this algo-rithmic formulation are techniques in time discretization, discrete treatment of pressure terms, and compatible stress/velocity-gradient representation. We shall argue that the current simulations for the FENE-CR model have re-sulted in a major improvement in the sort-for agreement between theory and experiment in this important bench-mark problem.
The Investigation and Study of Hydrogen Atom in Spherical Cavity Using B-Spline Basis Functions: A Mathematical Approach  [PDF]
Alireza Heidari, Foad Khademi Jahromi, Roozbeh Amiri, Mohammadali Ghorbani
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.34045
Abstract: The importance of studying the confined quantum systems as one of the most basic subjects in nanoscience is undeniable. The hydrogen atom confined in the spherical cavity is considered as one of the most important systems. In this paper, the energy spectrum of the hydrogen atom confined in the center of impermeable spherical cavity is computed through the variational method, and B-splines are utilized as the basis functions. These basis functions are able to produce the test wave functions with appropriate boundary conditions. High flexibility and localizability are the most significant B-splines’ properties. Furthermore, these functions are numerically stable, and able to accurately perform a substantial number of calculations. The proportion of changes in energy levels to changes in cavity’s dimensions is investigated. Considering the obtained results suggests this method’s high accuracy and performance.
The Investigation and Study of Hydrogen Atom in Spherical Cavity Using B-Spline Basis Functions: A Mathematical Approach  [PDF]
Alireza Heidari, Foad Khademi Jahromi, Roozbeh Amiri, Mohammadali Ghorbani
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.34045
Abstract: The following article has been retracted due to the investigation of complaints received against it. The Editorial Board found that substantial portions of the text came from other published papers. The scientific community takes a very strong view on this matter, and the Health treats all unethical behavior such as plagiarism seriously. This paper published in Vol.3 No. 4, 334-339, 2012, has been removed from this site.
Comparison of Obesity/Psychological Disorders Comorbid between Older and Younger Adult Women  [PDF]
Soodeh Razeghi Jahromi, Maryam Abolhasani, Maryam Bidadian, Leila Koti
Psychology (PSYCH) , 2013, DOI: 10.4236/psych.2013.411A001
Abstract:

Introduction: Epidemiologic data proposed a relationship between obesity and depression in older adults. We conducted this study to evaluate the association between obesity and depressive disorders, as well as a range of eating disorders in old women. Methods: From a total of 1477 clients referred to an outpatient clinic, 212 obese persons (97 persons 60+ and 115 persons 40 - 59 years of age) were enrolled. Data of demographics, comorbidities, anthropometrics, physical activity level, and diet, as well as, depressive and eating disorders were collected. Depressive and eating disorders were assessed using diagnostic structural interview based on DSM-IV-TR (Diagnostic Statistical Manual of Mental Disorder—fourth edition— Text version). BMI more than or equal to 30 was considered as obesity. Results: The prevalence of dysthymic disorder was significantly lower in older women compared to younger (p = 0.026). Comparable but not significant results were observed for major depression disorder, Bulimia Nervosa, and eating disorders not otherwise specified. Conclusion: Our findings suggest that obese older women were less likely to suffer from Comorbid dysthymic disorder/obesity compared to younger.

Microfacies and Sedimentary Environments of the Fahliyan Formation from the Southwest of Iran (Shiraz, Zagros)  [PDF]
Mahnaz Parvaneh Nejad Shirazi, Fatemeh Dashtaby Jahromi, Mohammad Bahrami
Open Journal of Geology (OJG) , 2013, DOI: 10.4236/ojg.2013.32008
Abstract:

The Fahliyan Formation is a carbonate sequence of Lower Cretaceous (Berriasian-Hauterivian) in age and was deposited in the Zagros sedimentary basin. This formation is a part of Khami Group and is a reservoir rock in Zagros Basin. This formation was investigated by a detailed petrographic analysis in order to clarify the depositional facies and sedimentary environment in the Kuh-e-Gadvan in Fars Province. Petrographic studies led to the recognition of nine microfacies that were deposited in four facies belts: tidal flat, lagoon, and barrier and shallow open-marine. An absence of turbidite deposits, reefal facies, and gradual facies changes indicate that the Fahliyan Formation was deposited on a carbonate ramp.

An in vitro study on cleaning efficiency of Mtwo and BioRaCe rotary nickel-titanium instruments  [PDF]
Saeid Zamiran, Maryam Zare Jahromi, Mohammadhossein Fathi, Ghazaleh Moghaddam
Health (Health) , 2013, DOI: 10.4236/health.2013.512277
Abstract:

Complete removal of smear layer and debris during the process of root canal therapy is of paramount importance in order to achieve the objectives of endodontic treatment. The aim of this study was to compare the amount of extruded debris and smear layer using two widespread rotary nickel-titanium instruments. Fifty eight freshly extracted human mandibular first molar mesial canals were randomly assigned into two groups. The root canals were instrumented using Mtwo (VDW, Munich, Germany), and BioRaCe (FKG Dentaire, LaChauxde-Fonds, Switzerland) NiTi instruments. Debris and smear layer from the apical thirds part during instrumentation were evaluated by scanning electron microscope. Then, the scores of remaining debris and smear layer were calculated for each group and compared. Data were then statistically analyzed using Mann-Whitney U test. There were significant differences in the amount of smear layer among two groups (P < 0.05). The greatest amount of apical debris was extruded by the BioRaCe group and the least by the Mtwo group. The results of the present study showed that, although both instrumentation techniques apically extruded debris and smear layer through the apical foramen, the Mtwo instruments induced less extruded debris and smear layer than the BioRaCe rotary systems.

 

第1页/共5773条
每页显示


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.