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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.
Synthesis of Zinc Oxide Nanoparticles and Their Effect on the Compressive Strength and Setting Time of Self-Compacted Concrete Paste as Cementitious Composites
Mohammad Reza Arefi,Saeed Rezaei-Zarchi
International Journal of Molecular Sciences , 2012, DOI: 10.3390/ijms13044340
Abstract: In the present study, the mechanical properties of self-compacting concrete were investigated after the addition of different amounts of ZnO nanoparticles. The zinc oxide nanoparticles, with an average particle size of about 30 nm, were synthesized and their properties studied with the help of a scanning electron microscope (SEM) and X-ray diffraction. The prepared nanoparticles were partially added to self-compacting concrete at different concentrations (0.05, 0.1, 0.2, 0.5 and 1.0%), and the mechanical (flexural and split tensile) strength of the specimens measured after 7, 14, 21 and 28 days, respectively. The present results have shown that the ZnO nanoparticles were able to improve the flexural strength of self-compacting concrete. The increased ZnO content of more than 0.2% could increase the flexural strength, and the maximum flexural and split tensile strength was observed after the addition of 0.5% nanoparticles. Finally, ZnO nanoparticles could improve the pore structure of the self-compacted concrete and shift the distributed pores to harmless and less-harmful pores, while increasing mechanical strength.
Design of Wide-Band Dielectric Resonator Antenna with a Two-Segment Structure
Pejman Rezaei;Mohammad Hakkak;Keyvan Forooraghi
PIER , 2006, DOI: 10.2528/PIER06110701
Abstract: This paper discusses the analysis of a novel two-segment rectangular dielectric resonator antenna (DRA) for broadening of the impedance bandwidth. In the proposed configuration, two rectangular dielectric sections are used which are separated by a metal plate. With this configuration, it is possible to excite two adjacent resonant frequencies. Utilizing the two-segment thin DRA and skillfully varying its aspect ratio, an appropriate structure is obtained that illustrates more than 76.8% impedance bandwidth (for >10 dB) at 3.32- 7.46 GHz frequency band.
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