نتایج جستجو برای: mn and al represent release from silicate hydrolysis and pyrite decomposition fe
تعداد نتایج: 17745258 فیلتر نتایج به سال:
چکیده: برای بررسی تنوع گونه ای کنه های بالاخانواده های tetranychoidea و raphignathoideaباغات و مزارع شهرستان های بناب و ملکان ، نمونه برداری هایی در فصل زراعی سال 1389 از خاک و اندام های هوایی صورت گرفت. در این مطالعه تعداد 2000 اسلاید میکروسکوپی از مجموع نمونه های جمع آوری شد و در مجموع 30 گونه از 15 جنس متعلق به 6 خانواده شناسایی گردید که از بین این تعداد 3 گونه برای فون کل دنیا و 2 گونه برا...
in this study reference as one of the five cohesive devices in the achievement of textuality in english and persian narrative/descripitive written texts is focused on and analysed . to do so , the theoretical framework elaborated by halliday and hasan (1976) and its version adapted by the writer to match the sub-types of reference in farsi are applied to the analysis of reference in english and...
چکیده سی و شش نمونه رسوب در طول رودخانه تیله بن به منظور تعیین مقدار اولیه فلزات ارسنیک، کادمیم، کروم، مس، نیکل، منگنز، آهن، جیوه، روی، کبالت، سرب، گوگرد، قلع، آلومینیوم و کلسیم توسط دستگاه جذب، جمع آوری شده و میزان سیالیت فلزات در رسوبات معلوم گردید. درجه آلودگی رسوبات نیز توسط شاخص ژئوتجمعی ارزیابی شد. آنالیز چند متغیره (آنالیز خوشه ای) به منظور تعیین منشأ فلزات سنگین مورد استفاده قرار گرفت....
the present study was an attempt to conduct a contrastive analysis between general english (ge) and english for specific purposes (esp) texts in terms of cohesion and cohesive devices. to this end, thirty texts from different esp and ge textbooks were randomly selected. then they were analyzed manually to find the frequency of cohesive devices. cohesive devices include reference, substitution, ...
the world wide web becomes very popular recently and plays an influential role in english learning. by burgeoning role of source-based writing as partial fulfillment of tefl courses and vast use of the internet, lack of empirical studies to explore these areas is obvious. this study aimed to explore the effect of the amount of familiarity with the web (internet literacy) on junior english stude...
according to coates’s (2004, as cited in zhang, 2010) definition of "conversational dominance" (p.111), it refers to the phenomenon of a speaker dominating others in interaction. specifically, it means how a speaker makes use of certain strategies to get the floor and maintain the floor. thus, the amount of talk is the main measurement for the dominance of the conversation. whether a speaker do...
The purpose of this study is to determine geochemical anomalies on lithogeochemical data from Ardestan area, Central Iran, using concentration-number (C-N) fractal modeling and staged factor analysis. Staged factor analysis is used to the recognition of genetic correlation and elimination of non-indicator elements in three steps. Factor scores of elements were calculated and geochemical data cl...
an experiment was conducted in the experimental field of seed and plant improvement institute in karaj for three consecutive cropping seasons, 2001-2003, to study the effects of eight different fertilizer treatments including some microelements on grain yield and protein content of a bread wheat cultivar pishtaz. the experiment was in a rcbd with three replications.eight fertilizer treatments w...
The geochemical behavior of zinc, lead and copper from sulfidic tailings in a mine site with potential to generate acidic drainage (pyrite (55%) and sphalerite (2%)) is reported in this paper. The mining area is divided in two zones, considering the topographic location of sampling points with respect to the tailings pile: (a) outer zone, out of the probable influence of acid mine drainage (AMD...
Aluminum and iron oxides have been often used in the coagulation processes during water purification due to their unique surface properties toward anions. In the presence of silica, the coprecipitation of Al/Si or Fe/Si might decrease the efficiency of wastewater purification and reuse. In this study, surface properties and molecular structures of Al/Si and Fe/Si coprecipitates were characteriz...
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