Corrosion and scaling in drinking water sources can lead to economic and health damages. These processes produce by-products in distribution systems, reduce chemical water quality, and are the cause of health issues among consumers. The aim of this study was to evaluate the corrosion and scaling potential of water supply sources of Marivan villages, Iran. In total, 106 water samples were collec...

We give a detailed description of recent developments in reduced scaling ab initio methods for treating electron correlation in atoms and molecules. Since configuration interaction (CI) is the simplest electron correlation method, it is introduced first and used as a context to describe the familiar local correlation and pseudospectral approximations. The article then goes on to discuss the app...

Methods exhibiting linear scaling with respect to the size of the system, so called O(N) methods, are an essential tool for the calculation of the electronic structure of large systems containing many atoms. They are based on algorithms which take advantage of the decay properties of the density matrix. In this article the physical decay properties of the density matrix will first be studied fo...