testing plays a vital role in any language teaching program. it allows teachers and stakeholders, including program administrators, parents, admissions officers and prospective employers to be assured that the learners are progressing according to an accepted standard (douglas, 2010). the problems currently facing language testers have both practical and theoretical implications but the first i...

In this paper,the effect of troidal magnetic field is studied in standard self-gravitating thin disks with β priscription. By applying the magnetic field, we expect to see different behaviors compared to a non-magnetic field case.The study reveals self-similar solutions for radial infall velocity, rotation velocity, surface density and mass accretion rate. Our results also show that by increasi...

Vegetation map is an association of plant species or communities that exist in a realm, and its preparation can give a clear picture of plant types or communities on the ground. For this purpose, three new maps were produced for Isfahan province: plant communities’ map, vegetation map revised based on Henry Pabo’ classification and botanic fomation map. These maps were prepared by field data co...

The species diversity of bumblebees was investigated in two provinces, Tehran (Fasham, Zayegan) and Qazvin (Alamut, Wikan) in central Alborz during 2005-2006. Three casts of queen, worker and male bumblebees were collected during spring and summer in six dates in the two mentioned regions. Sampling of adult bees in Wikan was done from 26 July 2006 until 19 September 2006, and in Zayegan from 24...

The species diversity of bumblebees was investigated in two provinces, Tehran (Fasham, Zayegan) and Qazvin (Alamut, Wikan) in central Alborz during 2005-2006. Three casts of queen, worker and male bumblebees were collected during spring and summer in six dates in the two mentioned regions. Sampling of adult bees in Wikan was done from 26 July 2006 until 19 September 2006, and in Zayegan from 24...

 Specimens collected from the forest areas of Mazandaran Province (Iran), Kojour, between Lashkenareh and Gandis-Kala village showed significant characteristics. At first glance, these specimens looked similar to A. szowitsianum, but with no indumentum on fruit. Further studies showed that those specimens belong to a new species, Alyssum mazandaranicum Mirzadeh & Assadi sp. nov., wh...