in this research calcium fluoride nanoparticles and its different amount of cerium ion dopant (5%and 10%) were prepared. the mentioned nanoparticle were studied by fourier transform infrared spectroscopy (ftir) , x-ray diffraction (xrd), absorption and photoluminescence spectra (pl) and scanning electron microscopy (sem). the xrd patterns indicate a typical cubic fluorite structure and no other...

We investigated the effects of organic and conventional pest and fertility management on weed cover and the seed bank community in an organic rotation. The study was conducted during the 4th and 5th years of an organic rotation on part of a long term organic-conventional comparison trial. Results showed that although crop type (potato vs. cabbage) in a single year significantly affected wee...

  The diagnosis of functional constipation (FC) is usually straightforward. Almost 95% of childhood constipation is functional in nature. The remaining 5% can be attributed to wide variety of conditions. Many of these etiologies are obvious by history and examination and many have other specific symptoms besides constipation. It is especially important to look for presence of any symptoms or si...

fatemeh karimi tabar was born in asadabad/hamedan (iran) in 1986. she completed her b.sc. in chemistry in 2008 from bu-ali sina university, hamedan, iran. she was graduated from m.sc. degree in organic chemistry from shiraz university 2010, shiraz, iran. she is currently organic chemistry ph.d student under the supervision of prof. m.a. zolfigol and prof. a. khazaei in department of chemistry a...

A statistical mechanical expression for the anisotropic surface (anchoring) en~ ergy of a nematic polymer melt is derived m the molecular field approximation using the density functional approach It is shown that this

Since the development of the living / controlled radical polymerization method ATRP (= atom transfer radical polymerization) in 1995 [1] new catalysts for this reaction have been intensively investigated. This method conquered rapidly numerous fields in chemistry ranging from organic and polymer synthesis to materials science and nanotechnology. Guanidine copper complexes display high activity ...

Fatemeh Karimi Tabar was born in Asadabad/Hamedan (Iran) in 1986. She completed her B.Sc. in chemistry in 2008 from Bu-Ali Sina University, Hamedan, Iran. She was graduated from M.Sc. degree in organic chemistry from Shiraz University 2010, Shiraz, Iran. She is currently Organic Chemistry Ph.D student under the supervision of prof. M.A. Zolfigol and prof. A. Khazaei in department of chemistry a...