A spacetime horizon comprising with a black hole singularity acts like a boundary of a thermal system associated with the notions of temperature and entropy. In
Laser dye coumarin 440(C440) is codoped with pyrromethene 567 (PM567) into polymethyl methacrylate (PMMA ).The effects of C440 concentration on the performance
Structures and electronic properties of the pentaerythritol (PE) crystal under volume compression up to 0.85Vo are studied by E - V fitting method using density