Variable stars have been an incredibly important discovery since the early days of astronomy. Certain types of variable stars, such as Cepheids, can give not only great insight into the inner dynamics of stars, but also essential parameters of the star, such as luminosity, mass, and the distance from the observer. The number of discovered variable stars has risen dramatically over time, and sev...

In this paper, we explored the algebraic structures of solution spaces for Gaussian latent factor analysis when the population covariance matrix Σx is generated due to a latent Gaussian star graph. In particular, we found sufficient and necessary conditions under which the solutions to constrained minimum trace factor analysis (CMTFA) and constrained minimum determinant factor analysis (CMDFA) ...

This study focuses on two common though latent factors of Southern Baptist churches—appeals to fear and the assimilation of outside cultures. These variables play a significant role in shaping both the church as an organization and the communication that takes place within that organizational framework. The intended purposes, roles in communication, and effects of these factors are examined in ...

background: the aim of this study was to investigate the correlation between the cardiac and hepatic iron-overload as assessed by magnetic resonance imaging t2 star (mrit 2 -star) technique and serum ferritin level in patients with thalassemia major. methods: in this cross-sectional study we evaluated 170 patients in sayed shohada hospital in isfahan in the year of 2009, cardiac and hepatic iro...