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Showing 250 results for Bahram


Volume 0, Issue 0 (Articles accepted at the time of publication 2024)
Abstract

Autism is a neurocognitive disorder. Many children with autism do not have a change in language and usually tend to have literal interpretations of phrases, which makes it difficult to understand metaphorical language, which can be seen in both visual and visual metaphors. The aim of this study was to compare auditory and visual metaphorical perception in children with mild autism and normal children. The present study is a cross-sectional and causal-comparative study. The statistical sample of this study includes 30 boys aged 7 to 10 years with mild autism studying in educational centers for exceptional children in Mashhad and 30 normal children matched in terms of age who were selected by convenience sampling method. After initial language assessment, they were assessed by metaphorical perception test and U Mann-Whitney test and SPSS 23 software were used to analyze the data. The results of data analysis showed that in metaphorical perception in general there is a significant difference between autistic and normal children (P <0.001), also, in understanding visual and auditory metaphors, the two groups showed a significant difference (P <0/001). The obtained results indicate that compared to normal children, children with autism have a lower performance in terms of understanding visual and auditory metaphors, and considering this issue can be used in planning and designing educational content and rehabilitation interventions in order to improve educational performance and social benefit of these children.
 

Volume 0, Issue 0 (Articles accepted at the time of publication 2024)
Abstract

Derivational suffix “-ak” is one of the Persian productive affixes attached to different bases and creates many different meanings. Historical evidence affirms despite of the diversity of meaning, all the derivations come from the same original affix, with high potentiality in polysemy. The present article follows the cognitive-typological approach aims at investigating the polysemous behavior of the mentioned suffix while introducing the (sub)schemas of derivations in the framework of Construction Morphology. It deals also with the processes of metaphor and metonymy as two bases involved in the semantic extension. And then, by concerning the achievements of the first part with typological considerations, it shows the relationship between the cognitive processes involved in the polysemy and the typological motivations that follow them, i.e., economy and iconicity. Moreover, it examines how the typological explanations, specifically the concept of the semantic map, are not only valid for cognitivists, but also it can address more specific issues such as explaining the existence of polysemy within a single derivation. In this study, the Semantic Map Connectivity Hypothesis is also confirmed by those derivations that simultaneously imply more than one meaning, or that have undergone a change in meaning over time.
 

Volume 0, Issue 0 (Articles accepted at the time of publication 2024)
Abstract

The present study addresses the topic of relative clause extraposition in German. Relative clause extraposition occurs when a relative clause is displaced from its original position, which in German is immediately following the head noun, to the end of the main clause. This research aims to examine the reasons and conditions for the extraposition of relative clauses in German. It also seeks to demonstrate whether lexical elements, such as prepositional modifiers situated between the head noun and the relative clause, are used similarly in written and spoken language. The hypothesis of this study emphasizes two points: first, if the relative clause contains dense information, in other words, if the number of words used in the relative clause exceeds a certain limit, the relative clause tends to be extraposed from its original position. Second, the tendency for relative clause extraposition is greater in spoken language than in written language. The results of this study show that the dependents of the head noun differ in relative clauses in written and spoken language. It was also observed that relative clause extraposition is common in both forms; however, the number of words in the relative clause does not play a role in its extraposition. 


Volume 0, Issue 0 (Articles accepted at the time of publication 2024)
Abstract

Learning French as a foreign language presents unique challenges that may sometimes reduce students' motivation and academic performance. This study aimed to examine the relationship between cognitive and metacognitive strategies, mental vitality, and academic buoyancy among French language students. A mixed-method approach (quantitative and qualitative) was employed in two phases. In the quantitative phase, data were collected using standardized questionnaires on academic buoyancy, mental vitality, and cognitive and metacognitive strategies. The statistical population included all 61 French language students at Hakim Sabzevari University, who participated in the study through a census sampling method. In the qualitative phase, semi-structured interviews were conducted with 10 French language professors from Iranian universities to explore their perspectives and experiences regarding academic buoyancy and its influencing factors. Quantitative data were analyzed using descriptive and inferential statistical methods, while qualitative data were examined through inductive content analysis. The quantitative findings revealed that the use of cognitive and metacognitive strategies, along with mental vitality, positively influenced students' academic buoyancy. Furthermore, qualitative results indicated that various factors, including social variables, family, educational emotions, learner goal-setting, learning strategies, cognitive functions, communication skills, cognitive and emotional skills, academic behavioral motivators, educational content, teacher-related personal variables, teaching skills and techniques, and the teacher's motivational approach, significantly impact students' academic buoyancy.
 

Volume 1, Issue 1 (3-2012)
Abstract

Subterranean termites are one of the most important pests of buildings, historic monuments and agricultural crops in some parts of Iran. Using entomopathogenic fungi as microbial insecticides is usually a part of biological control and insect pest management. The pathogenicity of entomopathogenic fungus, Metarhizium anisopliae (Metschnikoff) Sorokin (DEMI 001) isolated from Rhynchophorus ferrugineus (Oliver) was compared against two subterranean termites, Amitermes vilis (Hagen) and Microcerotermes gabrielis (Weidner) under laboratory conditions. Suspensions of the fungus spores at five concentrations of 101, 102, 103, 104, 106 spores ml-1 were prepared to define LC50 and LT50. To determine LC50 and LT50 of M. anisopliae, bioassays were carried out on worker casts of both termite species. LC50 values for A. vilis and M. gabrielis were 8.5 × 103 and 0.2 × 102 spores ml-1, respectively. LT50 value for M. gabrielis was shorter than that of A. vilis at all five concentrations tested. According to the results of the bioassay, M. anisopliae was more effective for controlling M. gabrielis than that for A. vilis.

Volume 1, Issue 1 (3-2012)
Abstract

The cotton bollworm, Helicoverpa armigera (Hübner), which is known as one of the most important economic pests, can cause severe damage to different crops in Iran and many countries of the world. The effect of five maize hybrids: SC260, SC500, SC700, SC704 and DC370 on lysozyme activity in the hemolymph of sixth instar of H. armigera using lytic zone assay and its association with some fitness parameters of this pest was studied in growth chamber (25 ± 1˚C, 65 ± 5% RH and a photoperiod of 16:8 (L : D) h). Our results indicated that except on SC260, the frequency of high immune-activated larvae on the other maize hybrids was lower than that of low immune-activated larvae. The mean lysozyme concentration in H. armigera larval hemolymph was the highest on SC260 (0.096 ± 0.01 mg/ml) and lowest on DC370 (0.060 ± 0.007 mg/ml). The longest pupal period was on SC500 (12.00 ± 0.49 days) and the shortest was on SC700 (10.37 ± 0.19 days). Daily and total fecundities of H. armigera were the highest on DC370 (61.68 ± 9.85 and 196.89 ± 49.30 eggs, respectively) and lowest on SC260 (20.60 ± 5.88 and 52.71 ± 18.80, respectively). The results of this study can provide fundamental information for management of H. armigera on maize hybrids.

 



Volume 1, Issue 1 (3-2013)
Abstract

This research was carried out to investigate allelopathic effect of Peganum harmala on seed germination of Bromus tectorum. Aboveground and underground tissues of Peganum harmala in addition to its seeds were collected from Bijar rangelands. Collected materials of root, leaves, stem, seeds and a complex of mentioned parts were dried and powder. The research was performed at the greenhouse condition. The treatments included 1, 3, 6, 9 and 12 weight percentage of above mentioned powders. Also a control treatment was used, too. A completely randomized design (CRD) was applied for 4 weeks. Germination seeds were counted and recorded daily. Germination properties included: germination percentage, mean germination time, germination speed, inhibitory percentage. At the end of study period, radicle and stem length were measured. Data were analyzed by ANOVA. The results revealed that allelopathic effect of P. harmala resulted in negative effects on germination properties of Bromus tectorum. The high concentration of P. harmala has strong Allelochemicals inhibitory effects on germination and initial growth characteristics of B. tectorum. It was found that the materials obtained from different tissues of P. harmala had different levels of inhibition on germination properties of B. tectorum, so that seeds were the most inhibitor tissues. The lowest germination percentage and seedling growth resulted from 12gr powder of seeds.

Volume 1, Issue 2 (winter 2018)
Abstract

In general, temporary well plugging is essential for repairing of oil and gas wells due to their long life time. One of the newest methods used for this purpose is gel polymer plugging. The strength of the gel in the well conditions is one of the most important challenges in the application of gel polymer in the temporary well plugging in work over operation. In this study, silica nanoparticles were used to improve the strength of polymer hydrogels. The bottle and rheological tests were used to determine the gel strength in desired well conditions (high temperature and high salinity). Also, the gel strength properties and swelling behavior were studied in various conditions such as distilled water, formation water, tap water and oil. It was observed that the strength of the gel increased from 520Pa to about 36kPa (5000% increase) by adding nanoparticles. Also, the gel swelling in the aqueous solution has been significantly reduced. Based on the results obtained in this study, a polymer gel containing 9 wt.% of silica nanoparticles with structural strength and thermal stability at 90 °C was introduced for field studies.
Sahar Biukani, Ali Safarpour, Bahram Falahatkar,
Volume 2, Issue 1 (6-2013)
Abstract

Fish fauna at three stations along the Gamasiab River, Kermanshah Province, were investigated for 9 months. Samples were caught using electroshocker and cast net of 1.5 cm mesh size and had their 20 morphometric and 10 meristic characteristics recorded. Twenty three species and subspecies in 14 genera and 5 families were identified, including: minnows (Cyprinidae), sisorid catfishes (Sisoridae), bagrid catfishes (Bagridae), river loaches (Balitoridae) and spiny eels (Mastacembelidae). The highest number of species (18, 78.3%) and genera (10, 71.4%) belonged to Cyprinidae, while 2 species (8.7%) in 1 genus (7.1%) belonged to Balitoridae; the other three families each contained 1 genus and 1 species (4.3%). The lowest species diversity (9 species) was observed in upstream station while the highest diversity (16 species) was in downstream station. Among the identified fish, only Pseudorasbora parva was recognized as exotic and the others were native.

Volume 2, Issue 2 (6-2013)
Abstract

The effect of various host plants including chickpea (varieties Arman, Hashem, Azad and Binivich), common bean (variety Khomein), white kidney bean (variety Dehghan), red kidney bean (variety Goli), cowpea (variety Mashhad), and tomato (variety Meshkin) on the reproductive performance and growth indices of the cotton bollworm, Helicoverpa armigera (Hübner) was determined under laboratory conditions (25 ± 1°C, 65 ± 5% RH and a 16:8 h light:dark photoperiod). The highest rate of gross fecundity, gross fertility, net fecundity, net fertility, mean daily eggs and mean daily fertile eggs were observed on chickpea Arman (2947.8 ± 7.8, 2933.0 ± 7.8, 2404.2 ± 7.1, 2392.2 ± 7.1, 170.9 ± 0.4, and 170.1 ± 0.4 eggs female-1, respectively), whereas the lowest values of these parameters were on tomato Meshkin (847.5 ± 9.2, 673.8 ± 7.3, 225.5 ± 2.6, 179.3 ± 2.1, 67.9 ± 0.7 and 54.3 ± 0.5 eggs female-1, respectively). The development index of overall immature stages varied from 1.10 to 1.57, with the minimum on tomato Meshkin and the maximum on chickpea Arman. Also, the fitness and standardized insect-growth indices were highest (0.349 ± 0.009 and 0.058 ± 0.001 gr day-1) and lowest (0.052 ± 0.001 and 0.013 ± 0.000 gr day-1) on chickpea Arman and tomato Meshkin, respectively. The Weibull model sufficiently described the shape of the survivorship curve of adult H. armigera from life-table data. A significant fit was obtained with the Weibull model for H. armigera in all experimental host plants. The results of reproductive performance, growth indices and the cluster analysis showed that tomato Meshkin was partially resistant to H. armigera.
Bahram Falahatkar, Samaneh Ghaderi,
Volume 2, Issue 2 (9-2013)
Abstract

Aquaculture production is often accompanied by some stressors which undesirable effects on growth and physiological function. Music is one of the cases that could eliminate or reduce the effects of stressors. The purpose of this study was to determine the effect of Iranian traditional music on growth, reproduction and behaviour of zebra cichlid (Pseudotropheus zebra). Fish with an average weight 5.5  0.18 g were put under both music and silence treatment with the number of 2 fish/aquarium with 3 replicates for 4 weeks. Fish under music treatment were put twice a day and every 30 minutes under the Iranian traditional music. At the end of this period, suitable conditions for fish were created to spawning. The results showed no significant differences in growth parameters, but 50 percent of fish during the 2-week were spawned in music treatment. However, only 16.6 percent of fish under silent treatment were spawned. Of eggs and spawn time, significant differences were observed between two groups. When is music being played, the fish were found mainly along approach the speakers, while the distribution of fish treated silence was uniform. The results of present study showed that use of music can affect physiological function of fish, which have more tranquility and less stress on fish.

Volume 2, Issue 2 (Summer 2018)
Abstract

In this study, the effects of drying temperature and mechanical pressure on the surface structure and dynamical properties of polyaniline (PAni) were studied. PAni was synthesized through the aniline polymerization process in the presence of ammonium persulfate in acidic medium and normal methyl-2-pyrrolidine solution. The obtained solution was dipped on a substrate of quartz glass. Atomic force microscopy (AFM) analysis based on nano-indentation tests were used to determine the values of hardness, Young’s modulus and Poisson’s ratio of the films. The results of the analysis of the scanning electron microscope demonstrated that the surface morphology of the film is changed from a fiber-to-interconnected cross-linked networkby increasing the drying temperature. The transmission electron microscope analysis showed that the diameter of the fibers on the surfaces dried at 318 K and 418 K was 18 and 30 nm, respectively. AFM results showed that the mean surface roughness of PAni film at 318 K without mechanical pressure was 63 nm, while for the film pressed at 5 MPa was less than 35 nm. Thermo-mechanical analysis showed that the glass transition temperature of the PAni film prepared without mechanical pressure and the film pressed at 5 MPa were 386 K and 378 K, respectively. Investigating the temperature dependence and applied pressure on the film surface in determining the viscoelastic properties of the PAni nanostructured film can provide readers with appropriate information about the storage and loss modulus of the film and the activation energy of the polymer layer during the thermal decomposition process.



Volume 2, Issue 2 (Spring 2020)
Abstract

The outbreak of coronavirus in late 2019 and early 2020 in Wuhan, China and its widespread spread around the world has had different consequences for different parts of the world. The recent epidemic has raised the issue of vulnerability of border cities to epidemics. Because border cities are among the most vulnerable and economically, socially ecologically and fragile areas that can be highly susceptible to coronavirus.
 The present study is theoretical-applied and descriptive-analytical in terms of study method. The required data and information were collected in two ways: library and survey. The statistical population of the study included 78 professors, doctoral and master students in the fields of political geography, urban geography and land management who had the necessary familiarity with the study area (Paveh city). SPSS (Friedman test) has been used to quantify qualitative information and obtain some data analysis.  The research findings show that in terms of economic security, the level of household savings has decreased by 17.49 points. In terms of political security, reducing the level of food security with a score of 7.22, in terms of social security, the variable of reducing social interactions with a score of 8.25 and in terms of environmental security, reducing the destruction of natural resources with a score of 3.55 had the greatest impact on the outbreak of coronavirus in Paveh. Coronavirus has had a significant impact on the security of border cities
Mohammad Sadegh Alavi-Yeganeh, Bahram Falahatkar,
Volume 2, Issue 3 (12-2013)
Abstract

 Length-weight relationship, age range and fecundity of 40 specimens of the Russian sturgeon, Acipenser gueldenstaedtii, collected from two fishing stations in the southeastern Caspian Sea, were determined. Average length (TL) and weight were 129.5 cm and 12.7 kg for males and 145.8 cm and 22.15 kg for females, respectively. Absolute fecundity was 184000 in average and condition factor calculated 0/58 and 0/7 for male and females, respectively. Average age for males and females was 12.7 and 14.6 years, respectively. All these factors were lower than previous records from the Volga river estuary. Length-weight relationships results demonstrated isometric growth pattern with average slope of 2.978 and 2.822 for males and females respectively. These values were not statistically different between sexes (p> 0.05), but using this relationships for each sex separately will be useful for more reliable results especially in broodstock studies.

Volume 2, Issue 4 (, (Articles in Persian) 2011)
Abstract

Semantic Space of šod-{n ‘to become’ in Persian: A Cognitive Account This paper attempts to explore the semantic space of šod-{n ‘to become’ in Persian in order to address some basic features of linguistic cognition (e.g. analyzability and compositionality). One of the highly-frequent verbs in Persian is šod-{n, which with regard to its different functions at the level of sentence, can be considered as the most active verb in this language. According to a diachronic viewpoint, the same verbal form, šod{n, with four distinctive functions (as a main verb, as a copula, as a modal verb, and as the verbal constituent of complex predicates) plays an important role in Persian verbal system. The passive construction in Persian is considered as a Complex Predicate in which šod-{n combines with different linguistic categories such as noun, adjective, prepositional phrase and past participle (X in general). Its semantic space indicates that various types of constructions including šod-{n form a network of meanings, in which the verbal element šod-{n is meaningful, in contrast to the previous studies it's passive construction which considered it as a purely syntactic element carrying no meaning. Therefore, the passive construction in Persian is viewed as analyzable in which šod-{n is not a random occurrence but rather an extension of its other uses. The relatedness of the uses of šod-{n provides further evidence for the claim in Cognitive Grammar that the passive construction is part of a larger network of related syntactic constructions and not derives from the active construction.

Volume 2, Issue 4 (10-2016)
Abstract

Background: Salmonella typhimurium is one of the most important species of Salmonella that is intracellular parasite and attacks host mucus membrane. These bacteria can cause gastroenteritis, and their main transmission route is water, poultry, meat, egg, and raw food. The aim of this study was to detect three virulence genes associated with S. typhimurium named invA, STM4497, and fliC183 genes by Multiplex PCR method.
Materials and Methods: 183 samples of poultry were collected from food products in Zanjan (Iran) and cultured in BPW (Buffered Peptone Water) for 18 hr and at 37°C, and in RVS broth (Rappaport Vassiliadis Soya) for 6 hr at 41.5°C. After amplification of genomic DNA by Multiplex PCR method, occurrence of pathogen contamination was checked and compared with standard strain.
Results: From the total of 183 collected samples, 52(28.4%) samples were positive for S. typhimurium. The frequency of STM4497, fliC183, and invA genes were 49 (27%), 3 (2%), and 53 (29%), respectively.
Conclusion: Simultaneous detection of invA, STM4497, and fliC183 genes were recognized as a key for detection of S. typhimurium by Multiplex PCR method. 

Volume 3, Issue 1 (6-2013)
Abstract

Given the importance of loyalty, this study seeks to test and investigate the effectiveness and mechanism of relationship between factors that influence the e-loyalty in Saman Bank. In this regard, Relationship Marketing Strategy is the independent variable, e-satisfaction and e-trust are the moderating variables and e-loyalty is the dependent variable in the research model. The research population is a group of customers in Tehran who used the internet services of Saman Bank. Two underlying foundations of Relationship Marketing, mutual obligation and communication, significantly affect e-trust and conflict management foundations and competency are highly effective one-satisfaction. However; no meaningful relationship was found between conflict management and e-trust.      
Mohammad Alavi-Yeganeh, Bahram Falahatkar,
Volume 3, Issue 1 (6-2014)
Abstract

Length-weight relationships and fecundity of 93 individual female Acipenser persicus broodstocks were investigated. The specimens were caught during 2001-2005 from Golestan, Mazandaran and Guilan provinces along the southern coast of the Caspian Sea. Total length and weight of each fish was measured to the nearest 1cm and 100 g, respectively. Age determination was carried out by using transects of the first ray of pectoral fin. The absolute fecundity was assessed by egg count per weight unit of all eggs existed in the body. The specimens were from 13 to 20 years old, of which the 16 years old had the highest proportion with 23.7%. Range of total length and weight were 132.5 to 211 cm and 14 to 42 kg, respectively. Mean absolute fecundity was estimated 267810 ± 92570. Total length, weight and absolute fecundity of fish increased with age in all cases, showed a significant positive correlation (p <0.01). The slope of the length-weight relationship (b) was equal to 2.745 and isometric growth pattern was determined in this species.

Volume 3, Issue 2 (6-2014)
Abstract

Willow leaf beetle, Plagiodera versicolora is an important pest of willow trees that feeds on the leaves both as larvae and as adults. -Amylases (EC 3.2.1.1) are the major insect digestive enzymes that catalyze the endohydrolysis of long -1,4-glucan chains such as starch and glycogen. In the current study, -amylase activity was studied in the midgut of larvae and adults of P. versicolora. Amylase activity in the midgut of larvae and adults was 0.6807 and 0.1162 µmol/min/mg protein, respectively. The optimal pH for -amylase activity of larvae and adults was 4 and 8, respectively and the optimal temperature for both was 35 °C. The enzyme activity of larvae was inhibited by the addition of Na2+, K+ and Zn2+. K+ (at 5 mmol) had the most positive effect on α-amylase activity in adults. EGTA had significant influence on decreasing the enzyme activity in larvae. EDTA had the most effect on increasing the activity of the enzyme in adults. Plant amylase inhibitors play important role against insect pests. Therefore, the characterization of digestive enzymes and the examination of inhibitors on the enzyme activity could be useful in tackling insect pests.    

Volume 3, Issue 2 (6-2014)
Abstract

The cotton bollworm, Helicoverpa armigera (Hübner), is a serious pest on a wide range of economic crops in many parts of the world. In this study, digestive proteolytic and amylolytic activities of H. armigera larvae (3rd to 5th instars) were evaluated on five main host plants including chickpea (cv Hashem), cowpea (cv Mashhad), soybean (cv 033), navybean (cv Dehghan), and corn (cv SC 704) at 25 ± 1 °C, relative humidity of 65 ± 5% and a photoperiod of 16: 8 (L: D) hours. The results indicated that the highest enzyme activity was in 5th instar. The highest general protease activity of 3rd, 4th and 5thinstar larvae was found on corn. The larvae fed on corn had the lowest trypsin activity. This leads to hyperproduction of chymotrypsin and elastase-like enzymes to compensate the inhibition of trypsin. The larvae of H. armigera reared on cowpea had the highest level of amylase activity, and the lowest activity was in the larvae fed on corn. The results revealed that among host plants tested, corn was more resistant (unsuitable) to H. armigera. Study on digestive proteolytic and amylolytic activities of H. armigera can be used in identifying the antidigestive or antifeedent compounds, which will help us to design appropriate management programs.

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