ependymomas are glial tumors originate from ependymal cells lining the ventricles and the central canal of the spinal cord. two thirds of ependymomas arise in the infratentorial or intraventriclesandone-third aredetected in supratentorial area. however supratentorial “cortical” ependymomas are veryuncommon. ependymomas are usually infratentorial, intraventricular tumor, including 2–9% of all ce...

We describe an extention of the Standard Model (the νMSM) by three light singlet Majorana fermions – sterile neutrinos, which allows to address simultaneously the problem of neutrino oscillations and the problems of dark matter and baryon asymmetry of the Universe. We discuss the ways these new particles can be searched for in astrophysical, laboratory, and accelerator experiments.

Geometric Algebra makes it possible to formulate simple spinor equations of motion for classical particles and rigid bodies. In the Newtonian case, these equations have proven their value by simplifying orbital computations. The relativistic case is not so well known, but it has new and surprising features worth exploiting, including close connections to quantum mechanical equations. The curren...

We investigate the structure of the nucleon resonance N∗(1440) (Roper) within a coupled-channel meson exchange model for pion-nucleon scattering. The coupling to ππN states is realized effectively by the coupling to the σN , π∆ and ρN channels. The interaction within and between these channels is derived from an effective Lagrangian based on a chirally symmetric Lagrangian, which is supplemente...

We study the second fundamental form of semi-isometric CR immersions from strictly pseudoconvex manifolds into K\"ahler manifolds. As an application, we give a precise condition for umbilicality real hypersurfaces, extending well-known theorem by Webster on nonexistence umbilical points generic ellipsoids. other applications, extend linearity Ji-Yuan spheres with vanishing to important case thr...