This article analyses processes of change undergone by Spanish medium-sized cities during 1981–2011 on the one hand, and 2000–2018 other, as they are different sources. We established a classification to show importance this type city starting from hypothesis that process is generalised in which behave according their position territory. The dynamics predominantly associated with contexts econo...

The main challenge in Wastewater Treatment Plants (WWTP) by activated sludge process is the reduction of the energy consumption that varies according to the pollutant load of influent. However, this energy is fundamentally used for aerators in a biological process. The modeling of energy consumption according to the decision parameters deemed necessary for good control of the active sludge ...

Principal Component Analysis (PCA) is a fundamental data preprocessing tool in the world of machine learning. While PCA often thought as dimensionality reduction method, purpose actually two-fold: dimension and uncorrelated feature Furthermore, enormity dimensions sample size modern day datasets have rendered centralized solutions unusable. In that vein, this paper reconsiders problem when samp...

Safeguarding the energy security is an important energy policy goal of every country. Assuring sufficient and reliable resources of energy at affordable prices is the main objective of energy security. Due to such reasons as special geopolitical position, terrorist attacks and other unrest in the Middle East, securing Iran’s energy demand and increasing her natural gas exports have turned into ...