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Search Results: 1 - 10 of 4149 matches for " Amir Rahimi "
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Ochratoxin A in dried figs, raisings, apricots, dates on Iranian retail market  [PDF]
Ebrahim Rahimi, Amir Shakerian
Health (Health) , 2013, DOI: 10.4236/health.2013.512282
Abstract:

Ochratoxin A (OTA) is among the most important mycotoxins, and the International Agency for Research on Cancer (IARC) classifies it as possibly carcinogenic to humans (group 2B). A total of 121 samples of dried fruits from the central zone of Iran were analyzed for OTA by enzyme linked immunosorbent assay (ELISA) technique. The recovery percentages of OTA in spiked dried fruit samples at concentrations of 5, 10 and 20 ng/g were found to be 84.9%, 89.3% and 90.4% as mean, respectively. OTA was found in 20.7% of the analyzed samples by average concentration of 6.7 ± 3.9 ng/g. The incidence rates of OTA contamination in dried fig, raising, apricots, and date samples were 10.4%, 44.7%, 6.7% and 10.0%, respectively. The concentrations of OTA in 7.9% of contaminated dried raising samples and 2.1% of dried fig samples were higher than maximum tolerance limit accepted by European Union (10 ng/g). This value reflects that the analyzed samples have a minimal contribution to toxicological risk. To our best knowledge, the present study is the first report of the presence of OTA by ELISA in dried fruit samples in Iran.

 

On the Role of Strategy Use and Strategy Instruction in Listening Comprehension
Amir Hossein Rahimi
Journal of Language Teaching and Research , 2012, DOI: 10.4304/jltr.3.3.550-559
Abstract: This paper provides a review of ideas and research regarding the role of strategy use and strategy instruction in listening comprehension. Firstly, it provides a brief explanation of different models of listening comprehension. Secondly, it sketches out different categories of learning and listening strategies. Thirdly models of strategy instruction and different attitudes towards it are reviewed. Finally, empirical studies carried out to examine the role of strategy use and strategy instruction on listening comprehension is presented.
Assessing the Effects of Indirect Left Turn on a Signalized Intersection Performance: A Case Study for the Tehran Metropolitan Area  [PDF]
Maxim A. Dulebenets, Amir M. Rahimi, Arash Mazaheri
Open Journal of Applied Sciences (OJAppS) , 2017, DOI: 10.4236/ojapps.2017.711045
Abstract: Many signalized intersections are characterized with frequent left-turn moves. Vehicles waiting for a protected left turn may form long queues, which will increase the intersection delay and negatively impact the network performance. Researchers and practitioners across various countries underline that access management leads to a smoother traffic flow. One way of access management at intersections is to eliminate the direct left-turn maneuver. This study aims to evaluate how the traffic conditions will be affected from replacing the direct left turn with the right-turn U-turn maneuver at intersections. In case of the right-turn U-turn maneuver, a vehicle turns right instead of making the left turn and travels either to the median opening or to the next intersection to make a U-turn. Two simulation models are built using the Synchro Studio and Aimsun simulation software packages based on the data, collected from one of the busiest intersections in Tehran (Iran), to quantify the effects of replacing the direct left turn with the right-turn U-turn maneuver on the intersection and network performance. Results of a comprehensive simulation analysis indicate that the proposed access management treatment not only significantly reduces the total vehicle queue length and the total delay at the considered intersection, but also decreases the total network delay and the total travel time. Furthermore, elimination of the direct left turn increases the number of vehicles entering the network.
The Relationship among Listening Performance, Metacognitive Strategy Use and Motivation from a Self-determination Theory Perspective
Sasan Baleghizadeh,Amir Hossein Rahimi
Theory and Practice in Language Studies , 2011, DOI: 10.4304/tpls.1.1.61-67
Abstract: The purpose of this study was to investigate the relationship among metacognitive strategy use, motivation and listening test performance of EFL university students. The participants were 82 students majoring in English translation and literature at Allameh Tabataba’i and Shahid Beheshti Universities in Tehran, Iran. Data were collected using three instruments: MALQ (metacognitive awareness listening questionnaire), AMS (academic motivation scale), and the listening section of the TOEFL. After administering the listening section of the TOEFL (pre-test), students filled in the MALQ and AMS. A statistically significant correlation was found between metacognitive strategy use and listening performance, listening performance and intrinsic motivation, as well as metacognitive strategy use and intrinsic, extrinsic motivation.
Evaluation of an ESP Textbook for the Students of Sociology
Sasan Baleghizadeh,Amir Hossein Rahimi
Journal of Language Teaching and Research , 2011, DOI: 10.4304/jltr.2.5.1009-1014
Abstract: The present paper is an attempt to describe the process that was undertaken to evaluate the textbook English for the Students of Sociology: Social Science Texts taught at the University of Tehran. The purpose of this research project was to determine the overall pedagogical value and suitability of the book toward this specific language program. To achieve this goal, a questionnaire consisting of 20 items and examining 6 factors (practical concerns, materials in relation to course objective, subject matter, linguistic issues, skills and strategies, variety of tasks and activities, and the layout of materials) was used. Participants included 30 students of sociology, who were taking an ESP course at the University of Tehran. The findings indicated that the book, despite having merits, was not very suitable for the course. Suggestions regarding the kinds of activities, strategies, layout and other important issues are discussed.
Literature and Language Teaching
Mohammad Khatib,Amir Hossein Rahimi
Journal of Academic and Applied Studies , 2012,
Abstract:
GEOPHYTES OF SULDUZ REGION, WEST AZERBAYJAN PROVINCE, IRAN AND THEIR CHARACTERISTICS
Amir Rahimi,Ne?et Arslan,Mehrab Aghaalinejad
Pure and Applied Biology , 2012, DOI: nil
Abstract: Iran is very rich in terms of plant diversity. Sulduz region (36:57o E, 45:22 oN), West Azerbaijan Province, Iran; occupies an area of over 1050 km2, which is more than 2.5 percent of the total area of West Azerbaijan province. The altitude of region is between 1000–2100 m. The systematic study of flora especially in virgin regions has its own special challenges and excitement. Commercial collection and trade represents principle threat to individual species. The present research is concerned with the geophytes floristic investigation of Nemat, Baba Hasan, Sultan Yaghub valleys which are located 15 Km south west of Sulduz region and cover about 320 hectares. The study aimed to find the diversity of geophytes in this region and their features. Plant specimens were collected 25 times during 2008 – 2010 and were prepared for identification according to methods used in systematic studies. The study helped to identify 49 geophytes species belonging to 33 genus and 10 families. After identification the specimens were also studied for life form, chorotype, altitude of growth and consumption type (drug, food and industry).
Graph Coloring and Function Simulation
Amir Daneshgar,Ali Reza Rahimi,Siamak Taati
Mathematics , 2010,
Abstract: We prove that every partial function with finite domain and range can be effectively simulated through sequential colorings of graphs. Namely, we show that given a finite set $S=\{0,1,\ldots,m-1\}$ and a number $n \geq \max\{m,3\}$, any partial function $\varphi:S^{^p} \to S^{^q}$ (i.e. it may not be defined on some elements of its domain $S^{^p}$) can be effectively (i.e. in polynomial time) transformed to a simple graph $\matr{G}_{_{\varphi,n}}$ along with three sets of specified vertices $$X = \{x_{_{0}},x_{_{1}},\ldots,x_{_{p-1}}\}, \ \ Y = \{y_{_{0}},y_{_{1}},\ldots,y_{_{q-1}}\}, \ \ R = \{\Kv{0},\Kv{1},\ldots,\Kv{n-1}\},$$ such that any assignment $\sigma_{_{0}}: X \cup R \to \{0,1,\ldots,n-1\} $ with $\sigma_{_{0}}(\Kv{i})=i$ for all $0 \leq i < n$, is {\it uniquely} and {\it effectively} extendable to a proper $n$-coloring $\sigma$ of $\matr{G}_{_{\varphi,n}}$ for which we have $$\varphi(\sigma(x_{_{0}}),\sigma(x_{_{1}}),\ldots,\sigma(x_{_{p-1}}))=(\sigma(y_{_{0}}),\sigma(y_{_{1}}),\ldots,\sigma(y_{_{q-1}})),$$ unless $(\sigma(x_{_{0}}),\sigma(x_{_{1}}),\ldots,\sigma(x_{_{p-1}}))$ is not in the domain of $\varphi$ (in which case $\sigma_{_{0}}$ has no extension to a proper $n$-coloring of $\matr{G}_{_{\varphi,n}}$).
Finasteride induced depression: a prospective study
Babak Rahimi-Ardabili, Ramin Pourandarjani, Peiman Habibollahi, Amir Mualeki
BMC Pharmacology and Toxicology , 2006, DOI: 10.1186/1472-6904-6-7
Abstract: One hundred and twenty eight men with androgenetic alopecia, who were prescribed finasteride (1 mg/day) were enrolled in this study. Information on depressed mood and anxiety was obtained by Beck Depression Inventory (BDI), and Hospital Anxiety and Depression Scale (HADS). Participants completed BDI and HADS questionnaires before beginning the treatment and also two months after it.Mean age of the subjects was 25.8(± 4.4) years. At baseline, mean BDI and HADS depression scores were 12.11(± 7.50) and 4.04(± 2.51), respectively. Finasteride treatment increased both BDI (p < 0.001) and HADS depression scores significantly (p = 0.005). HADS anxiety scores were increased, but the difference was not significant (p = 0.061).This preliminary study suggests that finasteride might induce depressive symptoms; therefore this medication should be prescribed cautiously for patients with high risk of depression. It seems that further studies would be necessary to determine behavioral effects of this medication in higher doses and in more susceptible patients.Many cases of drug induced depression have been reported, specially amongst patients who are more susceptible for the disease. Drugs such as corticosteroids, Interferon Alpha, Angiotensin converting enzyme inhibitors and Calcium channel blockers are all apt to induce some depressive effects [1]. As depression and anxiety are important factors, concerning the quality of life and individuals' health [2], it is important to determine if any psychological or behavioral changes would occur with the prescription of a particular medication.Finasteride, a potent 5alpha-reductase inhibitor, has been approved by Food and Drug Administration (FDA) in December 1997 for treatment of androgenetic alopecia in men [3]. The largest application of finasteride consists in treating benign prostate hyperplasia which is non-malignant enlargement of the prostate gland that leads to bladder out flow obstruction. In women finasteride has been used in
The Influence of Heat Treatment on Microstructural and Physical Properties of Silicate Glasses with High-Content Lead Oxide
Saeid Kakooei,Zohreh Hamnabard,Rafi Ali Rahimi,Amir Hamidi
Journal of Engineering and Applied Sciences , 2012, DOI: 10.3923/jeasci.2011.304.312
Abstract: Homogenization and heat treatment control plays a primary role in the production of lead glasses. Homogenization processes are applied in different ways. One of the important methods which is also industrially practical for other glass systems is fritting that is the process of melting and quenching of molten materials to form small glass particles. In the current research, the effect of homogenization and heat treatment on the thermal and physical properties of lead glasses is investigated. The fritting procedure is applied six terms for lead glass composition and the effect of fritting on thermal, physical, chemical resistance and homogeneity of glass are studied. While the effects of 3 times of heat treatment on these properties are studied. Finally, the result of micro-structural analyses of glass specimens are presented showing that an increase of the fritting period has an undesirable influence on different properties of glass samples and this process would be used in joint considering of other effected parameters.
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