نتایج جستجو برای: high water and environment temperature

تعداد نتایج: 17275997  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه علامه طباطبایی 1389

abstract present research considered to examine and compare shahrray 14 years girls and boys narrative concerning with their responsibilities in this research, statistical society are 14 years girls and boys of shahrry . for performing this research. first, 14 years of 50 boys and 50 girls were selected in accidental method and have filled memati hormaled adolescents responsibility questioner...

پایان نامه :دانشگاه تربیت معلم - تهران - دانشکده علوم انسانی 1390

this study investigated the effects of manipulating the cognitive complexity of tasks along +/- few elements and the time limits on l2 learners writing performance. to conduct the study, 60 iranian efl learners with two levels of proficiency, low and high intermediate, were selected and assigned to three groups based on the time devoted to task completion. the participants performed both a simp...

پایان نامه :دانشگاه آزاد اسلامی واحد کرمانشاه - دانشکده زبانهای خارجی 1393

previous studies regarding teachers’ beliefs have revealed that teachers’ beliefs have influence on their classroom practices. the current study aimed to investigate the effect of teachers’ beliefs about teaching reading strategies on students’ motivation and success in reading comprehension in the context of english teaching as a foreign language in high schools of mazandaran, iran. data were ...

پایان نامه :0 1370

all analytical methods are generally based on the measurement of a parameter or parameters which are somehow related to the concentration of the species.an ideal analytical method is one in which the concentration of a species can be measured to a high degree precision and accuracy and with a high sensitivity. unfortunately finding such a method is very difficult or sometimes even impossible.in...

Journal: :علوم و تکنولوژی پلیمر 0
مهدی امجدی سوسن روشن ضمیر محمدحسن ایکانی

the nafion 117 membrane was doped with sio2 particles by sol-gel reaction. the reaction conditions to minimize leaching were investigated by using full factorial design of experiment. the results from the full factorial analysis indicated that the lowest amount of leaching takes place at 60oc without addition of acid and swelling of membranes prior to the reaction. the membranes, prepared at op...

ژورنال: آبزیان زینتی 2023
Abdi, Abdolmajid, Eagderi, Soheil, Radkhah, Ali Reza,

The present study was conducted in order to review the biological characteristics and breeding and maintenance methods of common platy (Xiphophorus maculatus) as one of the popular aquarium species in the world. The literature review showed that this species is native to subtropical and tropical regions including Mexico, Guatemala, Belize and Honduras. In terms of diet, common platy is omnivoro...

Journal: :تحقیق در علوم شیلاتی 0
a samnejhad m afsharnasab s kakoolaki a sepahdari

in  this  study,  the  effect  of  water  temperature  on  pathogenesis  of  aeromonas  hydrophila  in  freshwater  crayfish  astacus  leptodactylus  were  investigated.  in  our  study,  the  treatments  crayfish  have  exposed  to  a  hydrophila  with  concentration  of  3×106 cfuml-1  in  high  water  temperature (25˚c)  and  normal  water  temperature(10-15ċ).  the  untreated  control  grou...

پایان نامه :0 1392

it is definitely necessary to understand the concept and behavior of causation of life insurance policies and its determinants for insurance managers, regulators, and customers. for insurance managers, the profitability and liquidity of insurers can be increasingly influenced by the number of causation through costs, adverse selection, and cash surrender values. therefore, causation is a materi...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه رازی - دانشکده علوم 1391

in this work, a novel and fast method for direct analysis of volatile compounds (davc) of medicinal plants has been developed by holding a filament from different parts of a plant in the gc injection port. the extraction and analysis of volatile components of a small amount of plant were carried out in one-step without any sample preparation. after optimization of temperature, extraction time a...

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