return maximization or risk minimization is goal in portfolio optimization based on mean variance theory. the structure of correlation matrices and individual variance of each asset are two main factors in optimization with risk minimization object. it’s necessary to use appropriate variance and correlation coefficient for time series with clustering volatilities feature, too. in this research,...

background & aim: aggression is a phenomenon that causes irreversible damage to a community. psychodynamic theory suggests that aggression is rooted in early relationships with family members, especially mother. according to this theory, infant-mother relationship is a major predictor of an individual’s behavior from childhood to adulthood. this study aimed to investigate the correlation betwee...

in this paper, the structural properties of the b30n20 molecule have been investigated at b3lyp/6-31g (d) level of theory. the optimized structure and electronic properties calculations for the studiedmolecule have been performed using gaussian 03 program. a mathematical equation of third degreewas exploited for the correlation and exchange energy with the number of primitives. the naturalbondi...

background: adolescence is a sensitive period of acquiring normal and abnormal habits for all of life. the study investigates determinants of responsibility for health, spiritual health and interpersonal relations and predictive factors based on the theory of planned behavior in high school girl students in tabriz.   methods : in this cross-sectional study, 340 students were selected thorough m...

The electronic structures and the electrostatic potential of some amino derivatives of adamantane have been studied using the density functional theory. The partial atomic charges and nuclear quadrupole coupling constants (NQCC) of 14N nucleus of the considered molecules have been reported. The partial atomic charges are calculated with two methods for 14N nucleus: Mulliken charges and natural ...

purpose: the present study was to investigating the role of theory of mind and empathy in predicting behavioral-emotional problems in students from typical and divorce families that done the cause-comparison and correlation method. methodology: the subjects were 293 of the girl students of fifth and sixth grades which were selected by multi-stage cluttering sampling method. the tools are three ...

The Ly$\alpha$ forest provides one of the best means mapping large-scale structure at high redshift, including our tightest constraint on distance-redshift relation before cosmic noon. We describe how correlations in can be understood as an expansion cumulants optical depth field, which itself related to density field by a bias expansion. This direct connection between observable and statistics...