the aim of this paper is eliminating cr(vi) by natural hap. hap is a inexpensive material which is used from bovine critical bone ash in order to remove heavy metal ions like cr(vi). some experiments in different ph are performed (ph=2,3,7). maximum adsorption was appeared at ph=2, dosage=0.3 gr, c0=10 mg/l. cr(vi) removal depends on ph value and initial amount of cr(vi) result of experiments w...

126 abstract: in this research we studied the effects of cyclic hydration and dehydration of cysts of artemia urmiana and artemia parthenogenetica on the hatching percentage, survival and growth. the experiment was carried out in 3 treatments (1-3 hydration/dehydration cycles) with 3 replicates for each treatment. later effects of cold preservation at -20°c during three time periods were ...

the present study was carried on to investigate the use of face-keeping strategies in reaction to complaints by male and female in two different cultures, persian and american english. to see if apology strategies are affected by cultural, contextual preferences and gender of interlocutors in two distinct languages of persian and american english. the hypotheses to be tested were 1) ifids, acce...

feminine voice and narratology in wuthering heights wuthering heights as a general "bronte" work has extraordinary dimensions to it which can make it focal to different ways of interpretation. among other differences the issue of narrative voice is essential in understanding the ultimate purpose of wuthering heights. emily bronte uses different narrators from various focal points speaking of m...

building on previous studies on intellectual features and learners’ grammar learning, the present study aimed at investigating whether intelligence criterion had any impact on efl learners’ english grammar learning across two intelligence levels. in the current study, the participants were divided into two experimental and control groups by administration of raven i.q. test. this led to the for...

The findings gathered from the surface of Ghalā Bāng site contain several materials which belong to different periods and no full data about them in the said region are available for example potteries dating back to the Chalcolithic and Bronze Ages. This site is located at Bijar, Kurdistan province of Iran. From the viewpoint of scheduling, our data about when the site was active and when aband...

چکیده ندارد.

Qa'inat has been one of the principal carpet-weaving centres in Iran through the history. Studying the historical documents in the Archives of Astan Quds Razavi which relate to the supply and maintenance of the carpets in the Holy Shrine of Imam Reza (AS), the names of some regions such as Qa'in, Birjand and Dorokhsh are observed. These regions are important carpet-weaving centres in the Qa'ina...

The findings gathered from the surface of Ghalā Bāng site contain several materials which belong to different periods and no full data about them in the said region are available for example potteries dating back to the Chalcolithic and Bronze Ages. This site is located at Bijar, Kurdistan province of Iran. From the viewpoint of scheduling, our data about when the site was active and when aband...

asymmetric membranes are widely used in many industrial membrane separation processes. the major advantage of membrane filtration over the conventional process is its ability to remove a wider spectrum of particles without using any chemicals. hollow fiber configuration offer many advantages over flat-sheet or tubular membranes. the spinning process of hollow fiber may look simple, yet it is te...