نتایج جستجو برای: immersion precipitation
تعداد نتایج: 72906 فیلتر نتایج به سال:
the cognitive predictors (i.e.,phonological awareness, and rapid automatized naming) underlying reading achievement have not been researched in iranian partial english immersion and non-immersion programs. the present study sought to investigate the relationship between english and persian phonological awareness (pa), rapid autamatized naming (ran) and reading achievementof iranian students in ...
For centuries, Damask rose has been one of the most popular species of the rose family. Damask rose can be propagated using vegetative methods such as micropropagation. In this research, the use of temporary immersion system was reported for the first time for Damask rose micropropagation. For this reason, a traditional temporary immersion system was designed to facilitate its micropropagation....
The cognitive predictors (i.e.,Phonological Awareness, and Rapid Automatized Naming) underlying reading achievement have not been researched in Iranian partial English immersion and non-immersion programs. The present study sought to investigate the relationship between English and Persian Phonological Awareness (PA), Rapid Autamatized Naming (RAN) and reading achievementof Iranian students in ...
Polyacrylonitrile (PAN) membranes with nano-porous surface and high hydrophilicity were fabricated by addition of polyoxyethylene (40) nonylphenyl ether (IGEPAL) as an additive in the casting solution. The membranes were prepared from PAN/IGEPAL/1-Methyl-2-pyrrolidone (NMP) via phase inversion induced by immersion precipitation technique. Pure water was used as coagulation medium. The effects o...
Calcium leaching from cementitious materials into bentonite is a key process for the long-term alteration of cement–clay interfaces engineered barrier systems. Strong chemical gradients between cement and clay drive precipitation minerals such as calcium silicate hydrate (C–S–H) calcite. To analyze mineralogical porosity evolution at interface, composite specimens consisting paste mixed with va...
هدف از این تحقیق مقایسه پیشرفت تحصیلی و بسندگی زبانی دانش آموزان ایرانی در مدارس یک زبانه و دوزبانه به منظور بررسی تاثیر برنامه های غوطه ورسازی زبانی نسبی(partial efl immersion program) است. به این منظور،از میان مدارس راهنمایی موجود در شیراز، سه مدرسه،دو مدرسه یک زبانه به طور تصادفی و یک مدرسه دوزبانه به دلیل در دسترس بودن، انتخاب شد. هفتاد دانش آموز دختر در این تحقیق شرکت کردند. برای جمع آوری ...
In this study is presented the result obtained for treatment of waste water from medical sector using membrane filtration system. Polyethersulfone (PES) membranes were Dimethylformamide DMF like solvent, with different concentration to determine rejection variation dyes. Membranes by immersion precipitation method and permeation properties determined dead end technique. The results show that ca...
The aim of this study is to create TiO2 coating on the tile substrate using cell-gel and immersion method. Initially, TiO2 coating was prepared by sol gel method and then, deposition was performed in three stages with different immersion periods of 20, 40 and 60 s and finally, the samples were calcined at 450 °C. The phases and microstructural characteristics of the samples were analyzed using ...
A thermodynamic model of quaternary polymeric solution was developed for membrane formation. It incorporates two mixed solventsN-methyl-2-pyrrolidone (NMP) and tetrahydrofuran (THF), and two high molecular weight polymers cellulose acetate (CA) and polyvinyl chloride (PVC). Also, another polymeric solution was modeled by replacing (CA) with polyvinylpyrrolidone (PVP). The developed model depend...
Coatings of the Mg(OH)2/Mg-Al layered double hydroxide (LDH) composite were formed by a combined co-precipitation method and hydrothermal process on the AZ31 alloy substrate in alkaline condition. Subsequently, a superhydrophobic surface was successfully constructed to modify the composite coatings on the AZ31 alloy substrate using stearic acid. The characteristics of the composite coatings wer...
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