While the role of fluorine on mass transport in polymers has been subject extensive research efforts, less attention paid to played by other halogens, such as chlorine. These efforts favored synthesis a plethora perfluoropolymers which, although exhibiting enhanced physical aging resistance relative conventional hydrocarbon-based polymers, suffer from swelling and plasticization presence hydroc...

In many real world problems, data sometimes comes from n agents (n≥2), multipolar information exists. For issues that are associated with uncertainty, this information can not be showed with the values of crisp, fuzzy, intuitionistic or bipolar. Graph is one of the mathematical models widely used in different sciences. Ambiguity in a graph where data depends on the n parameter can not be showed...

background and objectives: meningoencephalitis in iranian children is frequent, but encephalitis is rare .the frequency of hhv-6 and hhv-7 in central nervous system diseases of our children is unclear. the aim of this study was searching the dna-s of hhv-6 & hhv-7 in csf samples of children with meningoencephalitis  materials and methods: a cross sectional study (2007-2009) was done in ped...

sponges are the simplest multicellular animals that lack defense mechanisms and rely on chemical defense  that have been used by mankind to develop antimicrobial drugs against diseases.  the present study was designed to demonstrate the antibacterial and antifungal activities of marine sponge dysidea pallescens semipolar and nonpolar extracts. in this study, d. pallescens were collected from he...

beside ziegler-natta and phillips catalysts the development of methylaluminoxane (mao) as cocatalyst incombination with metallocenes or other transition metal complexes for the polymerization of olefins haswidely increased the possibilities in controlling the polymer composition, polymer structure, tacticity and special properties with high precision. these catalysts allow the synthesis of isot...