oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

9 ( 1 )

2019 ( 6 )

2018 ( 30 )

2017 ( 40 )

Custom range...

Search Results: 1 - 10 of 6194 matches for " Amir Hossein Izad Doustdar "
All listed articles are free for downloading (OA Articles)
Page 1 /6194
Display every page Item
A Noise Measurement Study of the Traffic in the Modarres High Way in Tehran
Amir Hossein Izad Doustdar,Parvin Nasiri,Majid Abbas Pour
Audiology , 1999,
Abstract: We measured the noise caused by Vehicles and its subjective effects in the Modarres high way In Tehran. we examined 143 cases in 11 stations in the mentioned pathway with an accuracy of 95% and a standard deviation of 39%. The noise criteria of Leq and the number of vehicles were determined in dBA. The loudness contours were also measured in some stations to determine the subjective impacts of noise. Then the correlation of the responses of the interviewees with sound pressure level was measured. Based on our findings, decrease of the noise of traffic sources should be considered three levels: the first level is noise reduction at the level of source, e.g. the vehicles;the second is Noise reduction at the traffic level and the third is noise reduction at the level of general activity.
Photonuclear Effect on ITER Operation  [PDF]
Farshid Tabbakh, Amir Hossein Gharashi
Journal of Applied Mathematics and Physics (JAMP) , 2015, DOI: 10.4236/jamp.2015.38130
Abstract:

In this study, neutron and gamma radiation produced during the ITER tokamak operation including the nuclear heating were studied. This is an approach for analyzing the neutron flux by their contributions. The calculations were conducted using Geant4 Monte Carlo method based on the ITER simplified geometry. It was found that for present design of ITER, only 0.1% of neutrons is contributed by photonuclear interaction while, 33% belongs to the (n, xn) reaction. Finally by adding Beryllium element in the coolant leading to the increase in the neutron flux by increasing the rate of (γ, n) reactions was calculated.

Photonuclear Effect on ITER Operation  [PDF]
Farshid Tabbakh, Amir Hossein Gharashi
Journal of Applied Mathematics and Physics (JAMP) , 2015, DOI: 10.4236/jamp.2015.310150
Abstract: In this study, neutron and gamma radiation produced during the ITER tokamak operation including the nuclear heating were studied. This is an approach for analyzing the neutron flux by their contributions. The calculations were conducted using Geant4 Monte Carlo method based on the ITER simplified geometry. It was found that for present design of ITER, only 0.1% of neutrons is contributed by photonuclear interaction while, 33% belongs to the (n, xn) reaction. Finally by adding Beryllium element in the coolant leading to the increase in the neutron flux by increasing the rate of (γ, n) reactions was calculated.
Interferon-Gamma Gene Polymorphism in Iranian Patients with Multiple Sclerosis
Maryam Izad,Mohammad Vodjgani,Mohammad Hossein Nicknam,Jamshid Lotfi
Iranian Journal Of Allergy, Asthma and Immunology , 2004,
Abstract: Interferon- gamma (IFN- γ) is an important immune regulator and inflammatory cytokine which is implicated in the pathogenesis of multiple sclerosis (MS). A single nucleotide polymorphism, T to A, at position +874 in the first intron has previously been shown. This polymorphism is associated with IFN- γ production level. To study the effect of this polymorphism on susceptibility to multiple sclerosis, we screened genomic DNA samples from clinically definite MS patients and their unaffected first-degree relatives as controls, using sequence-specific primers (PCR-SSP). The results indicated that MS patients showed a lower TT (21.2% vs. 30.3%) and higher AA (21.2% vs. 12.1%) genotypes compared to controls, although there were statistically no differences in the IFN- γ genotype distribution between these two groups. Thus, our data indicate that there is no association between IFN- γ +874 polymorphism and MS susceptibility or severity of the disease.
Tree Based Energy and Congestion Aware Routing Protocol for Wireless Sensor Networks  [PDF]
Amir Hossein Mohajerzadeh, Mohammad Hossien Yaghmaee
Wireless Sensor Network (WSN) , 2010, DOI: 10.4236/wsn.2010.22021
Abstract: Wireless Sensor Networks (WSNs) have inherent and unique characteristics rather than traditional networks. They have many different constraints, such as computational power, storage capacity, energy supply and etc; of course the most important issue is their energy constraint. Energy aware routing protocol is very important in WSN, but routing protocol which only considers energy has not efficient performance. Therefore considering other parameters beside energy efficiency is crucial for protocols efficiency. Depending on sensor network application, different parameters can be considered for its protocols. Congestion management can affect routing protocol performance. Congestion occurrence in network nodes leads to increasing packet loss and energy consumption. Another parameter which affects routing protocol efficiency is providing fairness in nodes energy consumption. When fairness is not considered in routing process, network will be partitioned very soon and then the network performance will be decreased. In this paper a Tree based Energy and Congestion Aware Routing Protocol (TECARP) is proposed. The proposed protocol is an energy efficient routing protocol which tries to manage congestion and to provide fairness in network. Simulation results shown in this paper imply that the TECARP has achieved its goals.
Effects of Fillerwire Composition along with Different Pre- and Post-Heat Treatment on Mechanical Properties of AISI 4130 Welded by the GTAW Process  [PDF]
Ali Emamian, Ardalan Emamian, Amir Hossein Kowkabi
Materials Sciences and Applications (MSA) , 2010, DOI: 10.4236/msa.2010.13022
Abstract: This research intends to find out the optimal mechanical properties of AISI 4130 steel welded by the GTAW process. Six test plates were joined by two types of filler wire with similar chemical composition to the base metal, and with lower carbon content and slightly higher alloy elements content compared to the first one. Test plates then exerted three different pre-heat and post-heat treatments on both groups. The three types of heat treatments were alternatively without pre-heat and post-heat, with pre-heat only, and finally with pre-heat and post-heat. Tensile, side bends and impact tests (for weld zone and HAZ) have been conducted. Results show that using low-carbon filler wire along with pre- and post-heat resulted in outstanding mechanical properties.
Predict Edges in Fliker Social Network Using Data Mining Method  [PDF]
Amir Hossein Rasekh, Zeinab Liaghat, Ala Mahdavi
Intelligent Information Management (IIM) , 2012, DOI: 10.4236/iim.2012.43009
Abstract: Using social networking services is becoming more popular day by day. The websites of the social networks like face-book currently are among the most popular internet services just after giant portals such as Yahoo, MSN and search engines like Google. One of the main problems in analyzing these networks is the prediction of relationships between people in the network. The purpose of this paper is to forecast the friendship of a person with a new person using existing data on Flickr website accurately. In this paper, we achieved about 90% percent correct prediction with regards to the results which are obtained by using data mining methods.
Helicobacter pylori microbe and detecting with data mining algorithms  [PDF]
Amir Hossein Rasekh, Zeinab Liaghat, Alireza Tabebordbar
Open Journal of Gastroenterology (OJGas) , 2013, DOI: 10.4236/ojgas.2013.32016
Abstract:

Nowadays medicines believe that the only definite method to diagnose the existence of Helicobacter pylori microbe is performing endoscope, however it’s painful and insufferable for young children. Thus in this paper we used data mining algorithms to diagnose the existence of this microbe and eventually we succeeded in predicting the existence of this bacterium in stomach that guides medicines to perform Endoscopy just in cases where percentage of finding this bacterium is high.

Evaluating of Training and Internship Programs of University Hospitals  [PDF]
Farzianpour Fereshteh, Emami Amir Hossein, Hosseini Shayan
Health (Health) , 2016, DOI: 10.4236/health.2016.87069
Abstract: Objective: This study aimed to assess training and internship programs (courses) of basic and clinical sciences in hospitals based on surveying the students of Tehran University of Medical Sciences. Material and Methods: The present study was a cross-sectional one with survey descriptive designs. The data collection tool was a questionnaire with 14 five-point likert style items. The Research and Development Center of Tehran University of Medical Sciences surveyed all 185 students of training and internship programs, using a questionnaire with the Cronbach’s alpha coefficient of 81%, for the purpose of adjusting the education to the society’s needs and improving its quality. Result: The mean scores of the assessment of training and internship programs were 3.32%, 2.98%, 3.38% and 3.29%, respectively for theoretical classroom training related to practical training, mental, communicational and practical skills courses. The students’ satisfaction rate regarding the quality of educational courses of training and internship programs was 50.2%. Conclusion: Educational authorities have made necessary attempts to implement these programs and use potential resources for realizing the objectives and achieving the educational quality; however, they should make further attempts in this regard.
Mobile Phone Usage and the Risk of Brain Tumors  [PDF]
Naina Sawal, Amir Hossein Mortazavi Entesab
Occupational Diseases and Environmental Medicine (ODEM) , 2016, DOI: 10.4236/odem.2016.43006
Abstract: Purpose: This literature review investigated the possible association between the use of mobile phones and brain tumors. Methods: In brief, 11 publications were retrieved from JSTOR, PubMed, Google Scholar and Summon in order to compare the association between the usage of mobile phones in patients with a brain tumor and those without. Papers published in English, and after 2001 were selected for. There was no limit on age, gender, geographical location and type of brain tumor. Results: For regular mobile phone usage, the combined odds ratios (OR) (95% confidence intervals) for three studies are: 1.5 (1.2 - 1.8), 1.3 (0.95 - 1.9), and 1.1 (0.8 - 1.4), respectively. Furthermore, the odds ratio did not increase, regardless of mobile phone use duration. Additionally, Lonn et al. (2005) observed that the risk also did not significantly increase when assessing the laterality (ipsilateral or contralateral) of the tumor in relation to side of head used for the mobile phone. Kan et al. (2007) observed an OR of 1.22 when comparing analog phone to digital phone use. Conclusion: This review concludes that there is no current association between mobile phone use and the development of brain tumors. Although certain studies speak in favor of an increased risk, many are plagued with either: sampling bias, misclassification bias, or issues concerning risk estimates. Further research needs to be done in order to evaluate the long-term effect of mobile phone usage on the risk of developing a brain tumor.
Page 1 /6194
Display every page Item


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