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Search Results: 1 - 10 of 49 matches for " Mahboobe Moeen Moghaddas "
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Shear tensor and dynamics of relativistic accretion disks around rotating black holes
Mahboobe Moeen Moghaddas,Jamshid Ghanbari,Ahmad Ghodsi
Physics , 2012,
Abstract: In this paper we solve the hydrodynamical equations of optically thin, steady state accretion disks around Kerr black holes. Here, fully general relativistic equations are used. We use a new method to calculate the shear tensor in the LNRF (Locally Non-Rotating Frame), BLF (Boyer-Lindquist Frame) and FRF (Fluid Rest Frame). We show that two components of shear tensor in the FRF are nonzero (in previous works only one nonzero component was assumed). We can use these tensors in usual transonic solutions and usual causal viscosity, but we derive solutions analytically by some simplifications. Then we can calculate the four velocity and density in all frames such as the LNRF, BLF and FRF.
The Relationship between Personality Traits with Life Satisfaction  [PDF]
Abbas Ali Hosseinkhanzadeh, Mahboobe Taher
Sociology Mind (SM) , 2013, DOI: 10.4236/sm.2013.31015
Abstract:

The aim of this study was to investigate the relationship between personality traits with life satisfaction among employed women in higher education centers of Rasht. This study was performed on 206 employed women in higher education centers of Rasht selected by classified random sampling they answered the NEO questionnaire (Costa & McCrae, 1992) and the Satisfaction With Life Scale (Diener et al., 1985). Extraversion, conscientious and openness had a significant negative correlation with life satisfaction, and agreement has significant positive correlation with life satisfaction. The results of stepwise regression showed that personality traits can explain 19 percent of the variance in life satisfaction, interaction of income and education has not significant effect on the life satisfaction. The results of one way ANOVA indicated that there isn’t significant difference between employed women life satisfaction and personality trait in diversity higher education centers. Life satisfaction is influenced by interaction of different factors that one of these factors is personality traits.

A Two Step Secure Spectrum Sensing Algorithm Using Fuzzy Logic for Cognitive Radio Networks  [PDF]
Ehsan Moeen Taghavi, Bahman Abolhassani
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2011, DOI: 10.4236/ijcns.2011.48062
Abstract: In this paper, a two step secure spectrum sensing algorithm is proposed for cognitive radio networks. In this algorithm, the sensing results of secondary users are pre-filtered and applying fuzzy logic, so, the overall sensing performance of the network is improved. To determine pre-filter parameters, statistical parameters of the sensing results are used to remove those sensing results which are far from the majority sensing results. However, to obtain a better performance in the spectrum sensing, we propose a fuzzy logic to nullify the effects of malicious users who transmit false sensing data to the fusion center. We further propose a Fuzzy Trust Level for each user as to weight the sensing result of the corresponding user before combining all sensing results in the fusion center. Simulation results demonstrate that our proposed algorithm yield significant improvement in the performance of the spectrum sensing and identifying malicious users.
Efficacy of connective tissue as a membrane with anorganic bone using platelet-rich plasma in the treatment of
Vahid Esfahanian,Hamid Moghaddas,Omid Moghaddas
Journal of Isfahan Dental School , 2012,
Abstract: Introduction: Regenerative periodontal therapy with a combination of platelet-rich plasma (PRP), anorganic bovine bone mineral (ABBM) and guided tissue regeneration (GTR) has been shown to result in significantly higher clinical attachment level gains compared to open flap debridement. However, there is no data on the efficacy of PRP in combination with connective tissue graft as a membrane. The aim of this study was to evaluate the efficacy of ABBM and connective tissue graft (CTG) as a membrane with and without PRP in the treatment of alveolar intrabony defects.Materials and Methods: In this double-blind randomized clinical trial 15 pairs of intrabony defects in 15 patients with chronic periodontitis were randomly treated with a combination of PRP+ABBM+CTG (test group) or ABBM+CTG (control group). The following clinical parameters were evaluated at baseline and at 6-month re-entry visit using a stent as reference point: probing pocket depth (PPD), clinical attachment level (PAL-S), free gingival margin position (FGM-S), crestal position (CREST-S), crest to defect depth and defect depth to stent. Independent t-test was used to compare parameter means between the two groups and paired t-test was used to compare the parameter means in each group before and after treatment.Results: No differences were observed in any of the parameters between baseline and 6-month re-entry between the two groups. At 6-month interval the test group showed mean PPD reduction of 2.8 ± 0.8 (p value < 0.0001), CAL gain of 2.5 ± 0. (p value < 0.0001) and bone fill of 2.6 ± 0.4 mm (p value < 0.0001).Conclusion: Based on the results of this study both treatment modalities were effective in the treatment of intrabony defects and PRP had no additional effect on improving the clinical parameters. Furthermore, connective tissue graft was a good alternative membrane in the treatment of intrabony defects.Key words: Connective tissue, Guided tissue regeneration, Periodontium, Platelet-rich plasma.
Efficacy of subepithelial connective tissue grafts in the treatment of Miller’s Class I and II gingival recessions
Hamid Moghaddas,Vahid Esfahanian,Omid Moghaddas
Journal of Isfahan Dental School , 2011,
Abstract: Introduction: The aim of this literature review was to evaluate the efficacy of subepithelial connective tissue grafts (SCTG) in comparison with other commonly used techniques for the coverage of denuded root surfaces.Materials and methods: An electronic search was carried out in Medline and Pubmed for randomized controlled clinical trials with at least 6-month follow-ups comparing SCTG with other techniques for the treatment of gingival recession from 1994 up to August 2010. The studies eligible to be included in this review had the following criteria: (a) Miller’s Class I or Class II recession with a depth of at least 2 mm; (b) recession areas containing teeth with no caries or restorations; and (c) at least 10 participants per group at final examination. Of all the studies evaluated, 36 studies were considered relevant. The results showed that decreases in recession depth subsequent to SCTG were significantly greater compared to those with acellular dermal matrix grafts and guided tissue regeneration. Regarding clinical attachment level changes, differences between the groups were not significant. In relation to changes in the keratinized tissue (KT), the results showed a significantly higher gain in the width of KT with SCTG compared to GTR.Conclusion: The results of this review showed that subepithelial connective tissue grafts provide significantly better root coverage, higher clinical attachment gain and greater keratinized tissue width. Key words: Connective tissue, Tooth root surface, Gingival recession, Follow-up study.
Treatment of Inflammatory Gingival Lesion Caused by Vertical Root Fracture
Hamid Moghaddas,Arezou Pezeshkfar
Research Journal of Biological Sciences , 2012, DOI: 10.3923/rjbsci.2010.638.642
Abstract: Treatment of a tooth with vertical root fracture can be difficult and unpredictable. Quite often, the most predictable treatment possible is simply extraction. This study presents, a patient with an inflammatory gingival lesion on the labial aspect of the maxillary right central incisor due to vertical root fracture. This diagnosis confirmed during surgery. There was also a super contact on the mentioned tooth. Root canal therapy was done and super contact eliminated. After 5 weeks, the gingival gained normal appearance. A total of 12 months follow up showed that the results remained stable and the tooth treated remained asymptomatic. It is necessary to emphasize that it is not possible to extend the result of this treatment to all patients with vertical root fracture and at the present there is no predictable treatment for such teeth and extraction may be the only choice of treatment.
A Novel Approach for Replacing Legacy Systems
Y. Moghaddas,H. Rashidi
Journal of Applied Sciences , 2009,
Abstract: Modernizing and reengineering on the legacy systems is an essential need in software industries. The replacement of legacy software systems is one of the most effective parts in process of modernizing software systems. In this study, a useful method for replacement of legacy large systems is proposed. In this method, the incremental approach is used to create interface and control layers on the corresponding sectors in two systems. With considering a new system in under-controlled condition and testing with real data and finding possible errors, replacement process faces with low risk. In comparison of proposed method with other traditional methods, two main differences are considered. In proposed method, data bases and resources of new system shall be different with legacy system. Second difference is finding errors to make final systems ready to decrease the risks and increase reliability.
The Analysis of Transverse Topographic Symmetry Factor (T Index) in the Chekene-Mazavand, North East Iran  [PDF]
Mohammad Reza Sajadian, Mohsen Pourkermani, Manochehr Qorashi, Naser Hafezi Moghaddas
Open Journal of Geology (OJG) , 2015, DOI: 10.4236/ojg.2015.511069
Abstract: T index has been calculated in the Chekene-Mazavand region in the NE Iran. This index shows lateral tilting may be related to active tectonics. There are many streams and transverse topographic symmetry factor has been calculated for all streams of Kashafroud river. Firstly, based on digital elevation model, the study area was divided into 28 sub-basins. Then transverse topographic symmetry factor was calculated for each one. The values are between 0.14 and 0.57 and so, there are low, moderate and high levels of relative tectonic activities. The areas with low relative tectonic activities have found in sub-basinsno. 14, 15 and 24, moderate relative tectonic activities have found in sub-basinsno. 2, 5, 6, 7, 9, 10, 13, 16, 18, 19, 21, 22, 23, 25, 27 and 28 and high relative tectonic activities have found in sub-basinsno. 1, 3, 4, 8, 11, 12, 17, 20 and 26. The results show that theplains have got low to moderate level of tectonic activity and faulted areas have got high tectonic activity. This matter is compatible with its tectonic setting on the Kopet Dagh belt in north east Iran.
Palatal Cervical Enamel Projection in a Four Rooted Maxillary First Molar: A Case Report
Hamid Moghaddas,Zahra Alizadeh Tabari
Research Journal of Biological Sciences , 2012, DOI: 10.3923/rjbsci.2010.508.511
Abstract: Dental plaque has been implicated as the primary etiology in periodontal disease. Developmental aberrations in tooth morphology such as a Cervical Enamel Projection (CEP) may predispose the affected area to plaque accumulation and consequently cause periodontal breakdown. Cervical enamel projection is the most common anatomic variation in molar teeth. CEPs were most likely found on the buccal surfaces of mandibular molars. Maxillary first molars are particularly noteworthy for anatomical variations of the root canals. The least frequent anomaly appears to be that of the double palatal roots. The aim of this study was to present a case with CEP in palatal side of the first maxillary molar with 2 palatal roots.
Implant Placement with Simultaneous Guided Bone Regeneration Using Connective Tissue as a Barrier: Re-entry Evaluation
Shirin Amini Sedeh,Omid Moghaddas
Journal of Periodontology & Implant Dentistry , 2011,
Abstract: Connective tissue is an autogenous tissue which has shown successful results as a barrier due to its mesanchymal cells with osteogenic capacity. In this case the defect around the dental implant was treated simultaneously with demineralized freezed dried bone and connective tissue as a membrane. Re-entry was done to evaluate the site in 6 months. Restoration was com-pletely functional in the one-year period of follow-up after loading, with no signs of inflammation, pocket probing depthand gingival recession
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