due to the increasing cost and environmental impacts of fossil fuel consumption, using the renewable energies in data center has become an important and essential priority. although using renewable energies has less environmental harmful effects, but the high investment needed for their installations as well as their fluctuating power production characteristic, restricts their usage such that m...

The propagator for the massless vector field in de Sitter space cannot maintain invariance general covaraint gauge, except exactly transverse gauge limit. This is due to a previously overlooked Ward-Takahashi identity that must satisfy. Here we construct satisfies all conditions of consistently quantized theory. Our solution preserves cosmological symmetries and dilations, but breaks spatial sp...

Determining Break Even Point (BEP) in a production is an important thing to do. BEP analysis used as basis for profit planning. By knowing the (BEP), management can determine amount of or sales that must be made according target achieved. The research method literature review (literature study). Data collection techniques using secondary data taken from Kaggle site. uses descriptive statistics ...