The aim of this study was to develop an extended-release tablet formulation using a new in situ cross-linking method. The effects of polyvalent cations on theophylline release from tablets made with the polyanionic polymers sodium alginate and sodium carboxymethylcellulose, were investigated. Different miliequivalents of the di and tri-valent cation, Ca2+ and Al3+, were added to tablet form...

The student movement is considered as one of the important issues of Iranian political sociology, but its role and its nature and its relationship with other movements and movements in Iran have been discussed. The present article is trying to answer the role and function of the student movement in Iran. Using a descriptive-analytic approach, political currents have become instrumental in most ...

The expressiveness of the declarative language G odel can be improved by adding to it bounded quanti cations, i.e., quanti cations over nite domains, and arrays. Many problems can be expressed more concisely using bounded quanti cations than using recursion. Arrays are natural for many applications, e.g., in scienti c computing, and are conveniently used in bounded quanti cations. Treating bou...

Calix[8]arenes of conformational rigid were isolated. The NMR parameters of the structure of calix[8]arenes have been compared. The study of organic structures to form nanoporous materials is well-known in chemistry phenomena to find the crystal form of calix[8]arene as supramolecule. Investigated and compared hydrogen bonding, oxygen and nitrogen atoms effect on calix[8]arene and its complexes...

Calix[8]arenes of conformational rigid were isolated. The NMR parameters of the structure of calix[8]arenes have been compared. The study of organic structures to form nanoporous materials is well-known in chemistry phenomena to find the crystal form of calix[8]arene as supramolecule. Investigated and compared hydrogen bonding, oxygen and nitrogen atoms effect on calix[8]arene and its complexes...