Mehdi Bahrami

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Accurate information on the temperature field and associated heat transfer rates are particularly important in devising appropriate heat and water anagement strategies in proton exchange membrane (PEM) fuel cells. An important parameter in fuel cell performance analysis is the effective hermal conductivity of the gas diffusion layer (GDL). Estimation of the(More)
OBJECTIVE The aim of this study was to evaluate the seroprevalence of anti-H. pylori and anti-CagA antibodies in healthy children and to investigate those relation with age, sex, ABO blood groups and Rh status. METHODS Serum samples from 386 children (187 males; 199 females), aged 1-15 years were tested for the presence of antibody to H. pylori and its(More)
In this paper we introduce a new software architecture for Autonomic Grid computing networks by military C4ISR (Command, Control, Communications, Computers and Intelligence, Surveillance, & Reconnaissance) architecture. We discuss Self-* property of autonomic grid computing networks in autonomic grid computing networks can lead and manage by C4ISR(More)
Recently, Grid Computing Systems have provided wide integrated use of resources. Grid computing systems provide the ability to share, select and aggregate distributed resources as computers, storage systems or other devices in an integrated way. Grid computing systems have solved many problems in science, engineering and commerce fields. In this paper we(More)
In this paper we introduced a new enterprise architecture as NSSA for the establishment of networks without any infrastructure. Enterprise architecture is the following general structure planning system using information technology to optimize IT strategies to achieve business direction leads. In this architecture we use a component in this architecture,(More)
Cloud computing paradigm offers an opportunity to in-house IT departments to establish their services on the cloud with minimum investment, and lower maintenance cost. This opportunity includes database services that allow a massive amount of data to be stored on the cloud. However, outsourcing data to the cloud may expose users' data to the cloud vendor,(More)
A new class of gradient refractive index (GRIN) lens is introduced and analyzed. The interior iso-indicial contours mimic the external shape of the lens, which leads to an invariant geometry of the GRIN structure. The lens model employs a conventional surface representation using a coincoid of revolution with a higher-order aspheric term. This model has a(More)
The structural basis of zones of discontinuity in the living human eye lens has not been elucidated, and there is no conclusive explanation for what relevance they may have to the structure and function of the lens. Newly developed synchrotron radiation based X-ray Talbot interferometry has enabled the detection of subtle fluctuations in the human eye lens(More)
Cloud computing paradigm provides virtual IT infrastructures with a set of resources that are shared with multi-tenant users. Data Privacy is one of the major challenges when users outsource their data to a cloud computing system. Privacy can be violated by the cloud vendor, vendor's authorized users, other cloud users, unauthorized users, or external(More)