نتایج جستجو برای: radiation effects on human

تعداد نتایج: 9678779  

Journal: :Experimental Oncology 2016

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Journal: :The Open Biochemistry Journal 2012

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this thesis attempts to investigate the effects of prelistening activities on enhancing iranian efl learners` listening comprehension. the present study investigated ways in which learners` background knowledge could be activated in order to enhance their l2 listening comprehension by limiting the number of possible text interpretations prior to listening. the experiments conducted in this study examined the effect of prior knowledge and vocabulary teaching on iranian efl learners listening comprehension. the current study has two purposes: one is to investigate the effect of background knowledge on the second language listening comprehension of iranian intermediates and the other is to determine whether second language is facilitated by the introduction of unknown vocabularies in the form of prelistening activities. to conduct the study different instruments such as listening proficiency test and four listening tests such as pre and posttests were used and various statistical processes and techniques including paired-sample t-test, and analysis of variance (anova) were used. the findings of this study supported all three hypotheses tested. differences were found between the means of preteaching vocabulary variable, the background knowledge activation variable, and mean difference between these two strategies variable. subjects scored higher when the unknown words were taught in advance. likewise, subjects scored higher when they were asked some relevant questions about the topic than on those without them. there was, in addition, a significant difference between the means of preteaching vocabulary strategy and background knowledge activation strategy. in fact, preteaching vocabulary had a better effect in enhancing the students’ listening comprehension, in comparison to background knowledge activation strategy.

پایان نامه :دانشگاه آزاد اسلامی - دانشگاه آزاد اسلامی واحد تهران مرکزی - دانشکده زبانهای خارجی 1390
شیرین جوادی کما, بهدخت مال امیری,

this thesis attempts to investigate the effects of prelistening activities on enhancing iranian efl learners` listening comprehension. the present study investigated ways in which learners` background knowledge could be activated in order to enhance their l2 listening comprehension by limiting the number of possible text interpretations prior to listening. the experiments conducted in this stud...

15 صفحه اول
Journal: :Acta Medica Martiniana 2014

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Journal: :Bratislava Medical Journal 2019

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Journal: :Diyala Journal For Pure Science 2017

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Journal: :Biophysical Journal 2009

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Journal: :The FASEB Journal 2019

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Journal: :journal of biomedical physics and engineering 0
d shahbazi-gahrouei dept. of medical physics, school of medicine, isfahan university of medical sciences, isfahan, iran; [email protected] b hashmi-beni department of anatomical sciences, school of medicine, isfahan university of medical sciences, isfahan, iran z ahmadi msc of medical physics, dept. of medical physics, school of medicine, isfahan university of medical sciences, isfahan, iran

background: as the use of mobile phones is increasing, public concern about the harmful effects of radiation emitted by these devices is also growing. in addition, protection questions and biological effects are among growing concerns which have remained largely unanswered. stem cells are useful models to assess the effects of radiofrequency electromagnetic fields (rf-emf) on other cell lines. ...

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Journal: :Radiation research 2010
Nadia Falzone Carin Huyser Daniel R Franken Dariusz Leszczynski

Abstract Recent reports suggest that mobile phone radiation may diminish male fertility. However, the effects of this radiation on human spermatozoa are largely unknown. The present study examined effects of the radiation on induction of apoptosis-related properties in human spermatozoa. Ejaculated, density-purified, highly motile human spermatozoa were exposed to mobile phone radiation at spec...

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