دراسة الرتبة النحوية في الجملة القرآنية

The Syntactical Study of the Quranic Phraseology Arabic language renders primal focus on syntactical placement of words in a sentence id est each constituent of the sentence contains some specific placement which connotes the propriety of the sentence and it plays a vital role in its structural unity. It ought to be kept in mind that ancient syntacticians had unanimously concluded the primal role of specific placement. They highlighted its various forms as in some conditions constituents of a sentence can be replaced from its specific structural placement, for instance, object is placed in place of subject as in “ jaa ni alqom”( جاءني القوم) the people came to me. While in some other cases and conditions such replacement is not admissible and if such re-structure is made, it will dilute the connotation, for instance, the positions of conjunctive pronoun before the principal clause, adjective with noun, possessive noun with the noun-possession and the conditional clause with the sub-ordinate clause are not admissible otherwise all these re-placement of the constituents in a sentence will cause the deformation of structure and implications.

Structural, Electronic and Magnetic Properties of Spinel Based Transition Metal Oxides

Theoretical study of Spinel based Transition Metal Oxides is reported. The Density Functional Theory approach is adopted for computational investigation using LAPW code. The structural, elastic properties of (XAl2O4 for X=Mg, Mn, Fe, Co, Ni, Cu, Zn), (MGa2O4 for M=Mg, Mn, Fe, Co, Ni, Cu, Zn, Cd), (NIn2O4 for N=Mg, Zn, In) & (ZnP2O4 for P=V, Cr, Fe, Rh, Sn) along with electronic & magnetic properties of cubic spinel oxides (XAl2O4) and (MGa2O4) have calculated. The calculated structural parameters conform to other experimental and theoretical evidences. Fulfillment of elastic stability criteria proves the reliability of the reported data. The calculated elastic constants show that all materials abide its stability opposing elastic deformations and the Cauchy’s pressure confirms the dynamical stability of these materials. The high values of bulk moduli show the hardness of these materials while the Young moduli data reveal that MgAl2O4 is the stiffer material among all. Further, Poisson’s ratios testify the compressibility, connote stableness to external deformation of these materials and reveal dominance of central forces being the interatomic forces. Out of 24 materials, only 05 are brittle and the rest are ductile with elastic anisotropy. MgAl2O4 is the most brittle and CdGa2O4 is the most ductile material. The electronic structure (Total DOS) show all XAl2O4, MGa2O4 (M=Fe, Co, Zn, Cd) have antiferromagnetic, NiGa2O4 & CuGa2O4 have FM state and the valence near Fermi level due to the transition metal 3d state. The calculation of direct exchange energy Δx(d) shows that the exchange mechanism of electrons is dominant in introducing magnetism and enormous exchange splitting is observed in these materials. The ferromagnetism in the group MGa2O4 of spinel oxide compounds is due to hybridization between the electrons in the 3d-states cation and 2p states anion. Appearance of magnetic moments in these materials is due to unpaired electrons in 3d states of Transition metal ions. The negative value of indirect exchange energy confirms the magnetism by spin of electrons.