OALib Journal期刊

ISSN: 2333-9721




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匹配条件: “Mohammad Rezaei” ,找到相关结果约13224条。
Geotechnical Properties of Problematic Soils Emphasis on Collapsible Cases  [PDF]
Mohsen Rezaei, Rasoul Ajalloeian, Mohammad Ghafoori
International Journal of Geosciences (IJG) , 2012, DOI: 10.4236/ijg.2012.31012
Abstract: Soils are unconsolidated materials that are result of weathering and erosion process of rocks. When water content of some soils change, it makes problems to civil activities. These problems include swelling, dispersing and collapse. The change of water content of expansive soils causes to changes their volume. The volume change can damage structures that have built on the soils. In dispersive soils, particles move through soils with water flow. It may be conduits form in the soils. Collapsible soils are settled when saturated under loading. The rapid collapse of soils damages the structures which have built on soil. Problematic soils are formed in especial geological conditions. For example, collapsible soils are often founded in semi-arid area. Field observation and laboratory test can be useful to identify problematic soils. Some properties of soils such as dry density and liquid limit are helpful to estimate collapsibility potential of soils. In this regard, it was done a series laboratory tests to evaluate the collapsibility rate.
The portrait of an Iranian as an English Language Learner: A case of identity reconstruction
Khatib, Mohammad,Rezaei, Saeed
International Journal of Research Studies in Language Learning , 2013,
Abstract: This is a case study exploring an Iranian English language learner’s identity within the Iranian EFL context and its potential relation with the success/failure and age of the learner. Also the learner’s inclination to his Persian identity, cultural norms, values and pronunciation patterns is investigated. In order to do so, in-depth interviewing and ethnographic observation were employed. The data collection and analysis procedure occurred between February and April, 2011 in Tehran. After the data were collected through interviewing and field notes in the ethnographic observation, they were transcribed and later turned into the participant’s life story. Important themes were dug out of the data using narrative analysis. The emerging themes from the current study were revealing about the participant’s identity and gave a portrait of the participant as an Iranian English language learner and his identity. Finally, the implications, limitations and future directions for this study are discussed.
Hausdorff measure of SLE curves
Mohammad A. Rezaei
Mathematics , 2012,
Abstract: In this paper we prove that the Hausdorff d-measure of SLE_{\kappa} is zero when d = 1+{\kappa}/ 8 .
Effect of KTP Laser on Surgically Resected Adenomas of Prostate
Mohammad Reza Razzaghi,Mojtaba Mohammad Hosseini,Alireza Rezaei,Iraj Rezaei
Journal of Lasers in Medical Sciences , 2011,
Abstract: INTRODUCTION: Palmoplantar psoriasis could hardly be differentiated from chronic tylotic eczema both clinically and histologically. The most commonly used therapeutic options for palmoplantar psoriasis are long-term therapy with topical corticosteroids and local PUVA. Frequently, it is a recalcitrant disease. We investigated the efficacy and tolerability of the combination of topical calcipotriol with local UVA radiation in comparison with local PUVA therapy. METHODS:In a total of 43 patients with palmoplantar psoriasis, 33 were given 15 sessions of local UVA radiation and topical calcipotriol and the remainder received 15 sessions of local PUVA (psoralen + UVA radiation). RESULTS:The statistical analyses of the results showed that the effect and tolerability of both therapeutic modalities are comparable. CONCLUSION: Combination of topical calcipotriol and local UVA radiation is an optional corticosteroid-free therapeutic modality for palmoplantar psoriasis. It has a comparable effectiveness and tolerability with local PUVA.
Comparison of the Prevalence and the Causes of Unwanted Pregnancy in Women Under 35 Versus Over 35 Years
Mohammad Amin Rezaei,Fariba Ghahramani
Journal of Family and Reproductive Health , 2011,
Abstract: Objective: The aim of this study is to compare the incidence of unwanted pregnancies in women under 35 and those over 35 years, compare the results with the previous data, and also to determine the causes of unwanted pregnancies in these women. Materials and methods: This cross-sectional study (descriptive - analysis) is performed on 400 pregnant women who had referred to the laboratories of Shiraz. Ten laboratories were randomly selected from different parts of Shiraz. The subjects were interviewed during the period of three months they referred for the result of their pregnancy test. Questionnaire included demographic information, how to use the methods of contraception, how to treat women with unwanted pregnancies, and the history of pregnancy. The chi-square tests, t-test, and logistic regression were utilized in order to compare two groups of women under 35 and over 35 and also to determine the factors related to unwanted pregnancies.Results: In this study, the prevalence of unwanted pregnancies in women under study was 14.7%. The incidence of pregnancy in women under 35 and those over 35 was 13.3% and 33.3%, respectively. The difference between the groups was found to be statistically significant (p=0.01).Conclusion: the percentage of unwanted pregnancies has reduced in Shiraz and this is indicative of the success of family planning. However the percentage of unwanted pregnancies in women over 35 is still high. Due to the fact that these women use unreliable methods training courses should be planned for them.
Higher moments of the natural parameterization for SLE curves
Mohammad A. Rezaei,Dapeng Zhan
Mathematics , 2014,
Abstract: In this paper, we will show that the higher moments of the natural parametrization of SLE curves in any bounded domain in the upper half plane is finite. We prove this by estimating the probability that an SLE curve gets near n given points.
Interactive Effects of Acute and Chronic Lithium with Dopamine Receptor Antagonists on Naloxone-Induced Jumping in Morphine-Dependent Mice
Mohammad Sharifzadeh,Homeyra Rezaei,Mohammad Reza Ghamsari
Iranian Journal of Pharmaceutical Research , 2003,
Abstract: In the present study, interactive effects of D1 and D2 dopamine receptors antagonists and different periods of lithium pretreatment on morphine dependence in mice have been investigated. This study was designed to investigate whether the hypothesis that lithium anddopaminergic mechanisms via their effects on phosphoinositide pathways and calcium flux could influence morphine withdrawal response as manifested in the jumping effect. Animals were treated subcutaneously with morphine (50, 50 and 75 mg/kg) three times daily (10 a.m., 1 p.m. and 4 p.m.) for 3 days, and a last dose of morphine (50 mg/kg) was administered on the 4th day. Withdrawal syndrome (jumping) was precipitated by naloxone (5 mg/kg) which was administered intraperitoneally 2h after the last dose of morphine. To study interactive effects of dopamine receptor antagonists and different duration of lithium pretreatment, 10 injection of morphine (3 administrations each day) for dependence and a dose of 5 mg/kg of naloxone for withdrawal induction were employed. SCH 23390 (0.01, 0.02 and 0.05 mg/kg) as a D1 dopamine receptor antagonist and sulpiride (20, 40 and 80 mg/kg) as a D2 dopamine receptorantagonist were able to prevent withdrawal signs precipitated by naloxone (5 mg/kg). Pretreatment of animals with lithium (600 mg/l) for 7, 14, 21 and 28 days, increased jumping induced by naloxone in morphine dependent animals. SCH 23390 did not show any significantalteration on the jumping response in animals pretreated with lithium for 28 days, but the inhibitory effects of sulpiride was significantly decreased in animals received lithium for 28 days. It is concluded that postreceptor mechanism (s) may be involve in the interactions of lithium with dopaminergic system in alteration of naloxone-induced jumping in morphine dependent animals.
Vocabulary Learning Strategies of Iranian upper-intermediate EFL learners
Mohammad Khatib,Mohammad Hassanzadeh,Saeed Rezaei
International Education Studies , 2011, DOI: 10.5539/ies.v4n2p144
Abstract: This study examines the preferred vocabulary learning strategies of Iranian upper-intermediate EFL learners. In order to identify the aforementioned group in terms of language proficiency, a TOEFL test was administered to a population of 146 undergraduate EFL students at the university of Vali-e-Asr in Rafsanjan, Iran. Those scoring above 480 were arbitrarily labeled as upper-intermediate. Subsequently a questionnaire known as VOLSI (Vocabulary Learning Strategies Inventory) was given to the same subjects to come up with their preferred vocabulary learning strategies. Finally, a stepwise multiple regression analysis revealed that 11.4% of the variance in the learners’ L2 proficiency can be accounted for by three strategy categories involving self-motivation, word organization, and authentic language use .In addition, an independent-samples t-test indicated no significant difference between learners’ gender and their VLS choice.
Attitude Control of a Quadrotor with Optimized PID Controller  [PDF]
Hossein Bolandi, Mohammad Rezaei, Reza Mohsenipour, Hossein Nemati, S. M. Smailzadeh
Intelligent Control and Automation (ICA) , 2013, DOI: 10.4236/ica.2013.43039
Abstract: A new approach to control, stabilization and disturbance rejection of attitude subsystem of quadrotor is presented in this article. Analytical method is used to tune conventional structure of PID controller. SISO approach is implemented for control structure to achieve desired objectives. The performance of the designed control structure is evaluated through time domain factors such as overshoot, settling time and integral error index, and robustness. A comparison is done between designed controller and back-step controller applied to main model of quadrotor. The results of simulation show the effectiveness of designed control scheme.
Manganese toxicity in the central nervous system: Decreeing of catecholamine in rat’s brains  [PDF]
Vahid Yousefi Babadi, Leyla Sadeghi, Esmaiel Amraie, Mohammad Rezaei, Ali Akbar Malekirad, Meghdad Abarghouei Nejad
Health (Health) , 2013, DOI: 10.4236/health.2013.512292

Manganese is an essential metal in human that functions in many enzymes. In contrast excessive exposure to Mn results in neurotoxicity. Accumulation of manganese damages central nervous system and causes Parkinson disease like syndrome called manganism. Mn neurotoxicity has been suggested to involve an imbalance in catecholamine neurotransmitters. It hypothesized that Mn can obstruct catecholamine synthesis pathway by inhibition of Tyrosine hydroxylase. Previous studies demonstrated that chronic and acute dose of Mn has different possible effects on catecholamine synthesis. It’s assumed that an acute dose of manganese can kill dopaminergic cells. Therefore, we focused the effect of Mn in catecholamine concentration on the rat’s brain by MnCl2 injection intraperitoneally and analyzed their brains after the time interval. This study used different acute doses in short time courses and different chronic doses at different exposing times to investigate which of them (exposing dose or time) is more important in Mn toxic effect. Measurement of catecholamine concentration performed by fluorescence assay in acidic and oxidant environment.



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