Abstract The “powder sandwich” method was adapted to the measuring equipment at Laboratory of Radiometric Expertise, IFJ PAN (Kraków, Poland). versatility has been confirmed. values thoron emanation coefficients (f) for 16 materials have determined. It found that value coefficient is not directly dependent on concentration 224 Ra, other factors are also important, e.g. size grains, inter-grain ...

0003-3472/$38.0

This study explored the fabrication, characterization, and microscopic imaging of highly porous electrospun nanofibers based on pure and Fe2O3 nanoparticle modified polyacrylonitrile (PAN) fibers. The desired electrospinning mixture comprising polymer and nanoparticles in dimethyleformamide, was prepared. During electrospinning, the precursor solution was injected using a ...

Practical applications of conducting polymers such as polyaniline as membranes are particulary limitedbecause of their poor mechanical properties. However by mixing polyaniline with some conventional insulatingpolymers such as nylon and preparation composite films through solvent casting or blending, it seems to be asuitable way in order to increase the mechanical properties of the conducting p...

this research seeks to study the impact of pan-turkist ideology on central asia. the collapse of the soviet :union: and independence of the central asian and caucasian states once again revitalized hopes among the pan-turkist theoreticians and strategists who were hopeless about the implementation of their project of establishing a turkic empire in the southern parts of the soviet :union:. cons...

abstract one of the losses decrease's ways in fields, is the proper irrigation management, which its base is the accurate estimation of crop water requirement. equations which are used to calculate the reference evapotranspiration (eto), do not use the same climatic parameters and due to their empirical base, are not match to all climatic situations. so it is needed to clarify proper methods fo...